PRECISION ILLUMINATION METHODS AND SYSTEMS
Methods and systems are provided for illuminating various materials using an LED system. These methods and systems can be applied to a plurality of materials, including biological entities, and may be employed to effect one or more changes in the illuminated material. Exemplary systems may be particularly configured and suitable for use in medical applications, including diagnostic and therapeutic interventions.
Latest Philips Solid-State Lighting Solutions Patents:
CROSS-REFERENCES TO RELATED APPLICATIONS
This application is a divisional (DIV) of U.S. Non-provisional application Ser. No. 10/255,565, filed Sep. 26, 2002, entitled “Precision Illumination Methods and Systems.”
Ser. No. 10/255,565 is a divisional (DIV) of U.S. Non-provisional application Ser. No. 09/213,189, filed Dec. 17, 1998, entitled “Precision Illumination Methods and Systems,” now U.S. Pat. No. 6,459,919.
Ser. No. 09/213,189 is a continuation-in-part (CIP) of U.S. patent application Ser. No. 08/920,156, filed Aug. 26, 1997, entitled “Multicolored LED Lighting Method and Apparatus,” now U.S. Pat. No. 6,016,038.
Ser. No. 09/213,189 also claims the benefit under 35 U.S.C. § 119(e) of each of the following U.S. provisional applications: Ser. No. 60/071,281, filed Dec. 17, 1997, entitled “Digitally Controlled Light Emitting Diodes Systems and Methods;” Ser. No. 60/068,792, filed Dec. 24, 1997, entitled “Multi-Color Intelligent Lighting;” Ser. No. 60/078,861, filed Mar. 20, 1998, entitled “Digital Lighting Systems;” Ser. No. 60/079,285, filed Mar. 25, 1998, entitled “System and Method for Controlled Illumination;” and Ser. No. 60/090,920, filed Jun. 26, 1998, entitled “Methods for Software Driven Generation of Multiple Simultaneous High Speed Pulse Width Modulated Signals.”
Each of the foregoing non-provisional and provisional applications is hereby incorporated herein by reference.
Light emitting diodes are known which, when disposed on a circuit, accept electrical impulses from the circuit and convert the impulses into light signals. LEDs are energy efficient, they give off virtually no heat, and they have a long lifetime.
A number of types of LED exist, including air gap LEDs, GaAs light-emitting diodes (which may be doubled and packaged as single unit offer greater reliability than conventional single-diode package), polymer LEDs, and semi-conductor LEDs, among others. Most LEDs in current use are red. Conventional uses for LEDs include displays for low light environments, such as the flashing light on a modem or other computer component, or the digital display of a wristwatch. Improved LEDs have recently been used in arrays for longer-lasting traffic lights. LEDs have been used in scoreboards and other displays. Also, LEDs have been placed in arrays and used as television displays. Although most LEDs in use are red, yellow or white, LEDs may take any color; moreover, a single LED may be designed to change colors to any color in the color spectrum in response to changing electrical signals.
It is well known that combining the projected light of one color with the projected light of another color will result in the creation of a third color. It is also well known that three commonly used primary colors—red, blue and green—can be combined in different proportions to generate almost any color in the visible spectrum. The present invention takes advantage of these effects by combining the projected light from at least two light emitting diodes (LEDS) of different primary colors. It should be understood that for purposes of this invention the term “primary colors” encompasses any different colors that can be combined to create other colors.
Computer lighting networks that use LEDs are also known. U.S. Pat. No. 5,420,482, issued to Phares, describes one such network that uses different colored LEDs to generate a selectable color, primarily for use in a display apparatus. U.S. Pat. No. 4,845,481, issued to Havel, is directed to a multicolored display device. Havel uses a pulse width modulated signal to provide current to respective LEDs at a particular duty cycle. U.S. Pat. No. 5,184,114, issued to Brown, shows an LED display system. U.S. Pat. No. 5,134,387, issued to Smith et al., is directed to an LED matrix display.
Illumination systems exist in which a network of individual lights is controlled by a central driver, which may be a computer-controlled driver. Such illumination systems include theatrical lighting systems. The USITT DMX-512 protocol was developed to deliver a stream of data from a theatrical console to a series of theatrical lights.
The DMX-512 protocol was originally designed to standardize the control of light dimmers by lighting consoles. The DMX-512 protocol is a multiplexed digital lighting control protocol with a signal to control 512 devices, such device including dimmers, scrollers, non-dim relays, parameters of a moving light, or a graphical light in a computerized virtual reality set. DMX-512 is used for control for a network of devices. The DMX-512 protocol employs digital signal codes. When a transmitting device, such as a lighting console, sends digital codes, a receiving device, such as a dimmer, transforms these codes into a function command, such as dimming to a specified level. With digital systems, signal integrity is compromised less over long cable runs, relative to analog control. When a coded string of 0/1 digits are sent and received, the device will perform the desired task.
In hardware terms, DMX-512 protocol information is transferred between devices over metal wires using the RS-485 hardware protocol. This involves the use of two wires, known as a twisted pair. The first wire is referred to as a data+wire, and the second wire is referred to as a data-wire. The voltage used on the line is typically positive five volts. By way of example, to transmit a logical one, the data+wire is taken to positive five volts, and the data-wire to zero volts. To transmit a logical zero, the data+wire goes to zero volts, and the data-wire to positive five volts. This is quite different from the more common RS-232 interface, where one wire is always kept at zero volts. In RS-232, a logical one is transmitted by putting between positive six and positive twelve volts on the line, and a logical zero is transmitted by putting a voltage between negative six and negative twelve volts onto the line. RS-485 is generally understood to be better for data transmission than RS-232. With RS-232, the receiver has to measure if the incoming voltage is positive or negative. With RS-485, the receiver only needs to determine which line has the higher voltage on it.
The two wires over which RS-485 is transmitted are preferably twisted. Twisting means that disturbances on the line tend to affect both lines simultaneously, more or less by the same amount, so that the voltage on both lines will fluctuate, but the difference in voltage between the lines remains the same. The result is that noise is rejected from the line. Also, the drive capability of RS-485 drivers is higher than RS-232 drivers. As a result, the RS-485 protocol can connect devices over distances hundreds of times further than would be possible when using RS-232. RS-485 also increases the maximum data rate, i.e., the maximum amount of data which can be transmitted over the line every second. Communication between devices using RS-232 is normally about nine thousand six hundred baud (bits per second). Faster communication is possible, but the distances over which data can be transmitted are reduced significantly if communication is faster. By comparison, DMX-512 (using RS-485) permits data to be sent at two hundred fifty thousand baud (two hundred fifty thousand bits per second) over distances of hundreds of meters without problems. Every byte transmitted has one start bit, which is used to warn the receiver that the next character is starting, eight data bits (this conveys up to two hundred fifty six different levels) and two stop bits, which are used to tell the receiver that this is the end of the character. This means that every byte is transmitted as eleven bits, so that the length of each character is forty-four micro seconds.
The receiver looks at the two incoming signals on a pair of pins and compares the differences. A voltage rise on one wire and the inverse on the other will be seen as a differential and therefore deciphered as a digit. When both signals are identical, no difference is recognized and no digit deciphered. If interference was accidently transmitted along the line, it would impart no response as long as the interference was identical on both lines. The proximity of the two lines assist in assuring that distribution of interference is identical on both wires. The signal driver sends five hundred twelve device codes in a continual, repetitive stream of data. The receiving device is addressed with a number between one and five hundred twelve so it will respond only to data that corresponds to its assigned address.
A terminator resistor is typically installed at the end of a DMX line of devices, which reduces the possibility of signal reflection which can create errors in the DMX signal. The ohm value of the resistor is determined by the cable type used. Some devices allow for self termination at the end of the line. Multiple lines of DMX data can be distributed through an opto-repeater. This device creates a physical break in the line by transforming the electrical signals into light which spans a gap, then it is restored to electrical signals. This protects devices from damaging high voltage, accidentally travelling along the network. It will also repeat the original DMX data to several output lines. The input data is recreated at the outputs, eliminating distortion. The signal leaves the opto-repeater as strong as it left the console.
DMX messages are typically generated through computer software. Each DMX message is preceded with a “break,” which is a signal for the receiver that the previous message has ended and the next message is about to start. The length of the break signal (equivalent to a logical zero on the line) has to be eighty-eight micro seconds according to the DMX specification. The signal can be more than eighty-eight micro seconds. After the break signal is removed from the line, there is a period during which the signal is at a logical one level. This is known as the “Mark” or ‘Mark After Break’ (MAB) time. This time is typically at least eight micro seconds. After the Mark comes the first character, or byte, which is knows as the “Start” character. This character is rather loosely specified, and is normally set to the value zero (it can vary between zero and two hundred fifty five). This start character may be used to specify special messages. It is, for example, possible to have five hundred twelve dimmers which respond to messages with the start character set to zero, and another five hundred twelve dimmers which respond to messages with the start character set to one. If one transmits data for these one thousand twenty-four dimmers, and one sets the start character to zero for the first five hundred twelve dimmers, and to one for the second set of five hundred twelve dimmers, it is possible to control one thousand twenty four dimmers (or more if one wishes, using the same technique). The disadvantage is a reduction in the number of messages sent to each of the set of dimmers, in this example by a factor two. After the start character there are between one and five hundred twelve characters, which normally correspond to the up to five hundred twelve channels controlled by DMX. Each of these characters may have a value between zero (for ‘off’, zero percent) and two hundred fifty five (for full, one hundred percent). After the last character there may be another delay (at logic one level) before the next break starts. The number of messages which are transmitted every second are dependent on all the parameters listed above. In one case, where the break length is eighty-eight microseconds, the make after break length is eight micro seconds, and each character takes exactly forty-four micro seconds to transmit there will be forty-four messages per second, assuming that all five hundred twelve channels are being transmitted. Many lighting desks and other DMX sources transmit less than five hundred twelve channels, use a longer break and make after break time, and may have a refresh rate of seventy or eighty messages per second. Often, there is no benefit to be had from this, as the current value is not necessarily recalculated for each of the channels in each frame. The ‘standard’ DMX signal would allow for a lamp to be switched on and off twenty-two times per second, which is ample for many applications. Certain devices are capable of using sixteen-bit DMX. Normal eight bit messages allow two hundred fifty-six positions, which is inadequate for the positioning of mirrors and other mechanical devices. Having sixteen bits available per channel increases that quantity up to sixty-five thousand five hundred thirty-six steps, which removes the limitation of ‘standard’ DMX.
A significant problem with present lighting networks is that they require special wiring or cabling. In particular, one set of wires is needed for electrical power, while a second set of wires is needed for data, such as DMX-512 protocol data. Accordingly, the owner of an existing set of lights must undertake significant effort to rewire in order to have a digitally controlled lighting environment.
A second significant problem with present lighting networks is that particular lighting applications require particular lighting types. For example, LED based lights are appropriate for some applications, while incandescent lamps or halogen lamps may be more appropriate for other applications. A user who wishes to have a digitally controlled network of lights, in addition to rewiring, must currently add additional fixtures or replace old fixtures for each different type of light. Accordingly, a need has arisen for a lighting fixture that permits use of different types of digitally controlled lights.
Use of pulse width modulated signals to control electrical devices, such as motors, is also known. Traditional methods of providing pulse width modulated signals include hardware using software programmed timers, which in some instances is not cost effective if not enough timer modules are available, and one interrupt per count processes, in which a microprocessor receives periodic interrupts at a known rate. Each time through the interrupt loop the processor compares the current count with the target counts and updates one or more output pins, thus creating a pulse width modulated signal, or PWM. In this case, the speed equals the clock speed divided by cycles in the interrupt routine divided by desired resolution. In a third method, in a combination of the first two processes, software loops contain a variable number of instructions. The processor uses the hardware timer to generate a periodic interrupt, and then, depending on whether the pulse is to be very short or not, either schedules another interrupt to finish the PWM cycle, or creates the pulse by itself in the first interrupt routine by executing a series of instructions consuming a desired amount of time between two PWM signal updates. The difficulty with the third method is that for multiple PWM channels it is very difficult to arrange the timer based signal updates such that they do not overlap, and then to accurately change the update times for a new value of PWM signals. Accordingly, a new pulse width modulation method and system is needed to assisting in controlling electrical devices.
Many conventional illumination applications are subject to other drawbacks. Conventional light sources, such as halogen and incandescent sources may produce undesirable heat. Such sources may have very limited life spans. Conventional light sources may require substantial lens and filtering systems in order to produce color. It may be very difficult to reproduce precise color conditions with conventional light sources. Conventional light sources may not respond quickly to computer control. One or more of these drawbacks may have particular significance in particular existing lighting applications. Moreover, the combination of these drawbacks may have prevented the development of a number of other illumination applications. Accordingly, a need exists for illumination methods and systems that overcome the drawbacks of conventional illumination systems and that take advantage of the possibilities offered by overcoming such drawbacks.
One embodiment of the present invention is directed to a method for effecting a change in a material. The method comprises providing an LED system for generating a range of colors within a color spectrum, selecting from the range of colors a set of colors, whereby the set of colors produces in the material the change, and illuminating the material with the LED system for a period of time predetermined to be effective in producing the change.
Another embodiment of the invention is directed to a method for treating a condition of a patient, comprising providing an LED system for generating a range of colors within a color spectrum, selecting from the range of colors a set of colors, whereby the set of colors produces in the patient a therapeutic effect, and illuminating an area of the patient with the set of colors for a period of time predetermined to be effective in producing the therapeutic effect.
Another embodiment of the invention is directed to a method for evaluating a material, comprising selecting an area of the material for evaluation, illuminating the area of the material with an LED system, determining at least one characteristic of a light reflected from the area, wherein the characteristic is selected from the group including color and intensity, and comparing the characteristic of the light reflected from the area with a set of known light parameters, whereby the set of known light parameters relates to a feature of said material.
Another embodiment of the invention is directed to a method for diagnosing a condition of a body part, comprising selecting an area of the body part for evaluation, illuminating the area of the body part with an LED system, determining at least one characteristic of a light reflected from the area, wherein the characteristic is selected from the group including color and intensity, and comparing the characteristic of the light reflected from the area with a set of known light parameters, wherein the set of known light parameters relates to the condition of the body part.
Another embodiment of the invention is directed to a system for illuminating a body part, comprising a power source, an LED system connected to the power source, said LED system adapted for illuminating the body organ, a medical instrument adapted for positioning the LED system in proximity to the body part whereby the LED system illuminates the body part, and a microprocessor for controlling the LED system.
As used herein, the term “LED system” means any electroluminescent diode or other type of carrier injection/junction-based system that is capable of receiving an electrical signal and producing a color of light in response to the signal. Thus, the term “LED system” should be understood to include light emitting diodes of all types, light emitting polymers, semiconductor dies that produce light in response to current, organic LEDs, electro-luminescent strips, and other such systems. In an embodiment, an “LED system” may refer to a single light emitting diode having multiple semiconductor dies that are individually controlled.
An LED system is one type of illumination source. As used herein “illumination source” should be understood to include all illumination sources, including LED systems, as well as incandescent sources, including filament lamps, pyro-luminescent sources, such as flames, candle-luminescent sources, such as gas mantles and carbon arch radiation sources, as well as photo-luminescent sources, including gaseous discharges, fluorescent sources, phosphorescence sources, lasers, electro-luminescent sources, such as electro-luminescent lamps, light emitting diodes, and cathode luminescent sources using electronic satiation, as well as miscellaneous luminescent sources including galvano-luminescent sources, crystallo-luminescent sources, kine-luminescent sources, thermo-luminescent sources, triboluminescent sources, sonoluminescent sources, and radioluminescent sources. Illumination sources may also include luminescent polymers capable of producing primary colors.
The term “illuminate” should be understood to refer to the production of a frequency of radiation by an illumination source. The term “color” should be understood to refer to any frequency of radiation within a spectrum; that is, a “color,” as used herein, should be understood to encompass frequencies not only of the visible spectrum, but also frequencies in the infrared and ultraviolet areas of the spectrum, and in other areas of the electromagnetic spectrum.
DESCRIPTION OF THE DRAWINGS
The structure and operation of various methods and systems that are embodiments of the invention will now be described. It should be understood that many other ways of practicing the invention herein are available, and the embodiments described herein are exemplary and not limiting.
LED system 120 includes a set 121 of red LEDs, a set 140 of blue LEDs, and a set 160 of green LEDs. The LEDs may be conventional LEDs, such those obtainable from the Nichia America Corporation. These LEDs are primary colors, in the sense that such colors when combined in preselected proportions can generate any color in the spectrum. While use of three primary colors is preferred, it will be understood that the present invention will function nearly as well with only two primary colors to generate a wide variety of colors in the spectrum. Likewise, while the different primary colors are arranged herein on sets of uniformly colored LEDS, it will be appreciated that the same effect may be achieved with single LEDs containing multiple color-emitting semiconductor dies. LED sets 121, 140 and 160 each preferably contains a serial/parallel array of LEDs in the manner described by Okuno in U.S. Pat. No. 4,298,869, incorporated herein by reference. In the present embodiment, LED system 120 includes LED set 121, which contains three parallel connected rows of nine red LEDs (not shown), as well as LED sets 140 and 160, which each contain five parallel connected rows of five blue and green LEDS, respectively (not shown). It is understood by those in the art that, in general, each red LED drops the potential in the line by a lower amount than each blue or green LED, about two and one-tenth V, compared to four volts, respectively, which accounts for the different row lengths. This is because the number of LEDs in each row is determined by the amount of voltage drop desired between the anode end at the power supply voltage and the cathode end of the last LED in the row. Also, the parallel arrangement of rows is a fail-safe measure that ensures that the light module 100 will still function even if a single LED in a row fails, thus opening the electrical circuit in that row. The cathode ends of the three parallel rows of nine red LEDs in LED set 121 are then connected in common, and go to pin 128 on connector 110. Likewise, the cathode ends of the five parallel rows of five blue LEDs in LED set 140 are connected in common, and go to pin 148 on connector 110. The cathode ends of the five parallel rows of five green LEDs in LED set 160 are connected in common, and go to pin 168 on connector 110. Finally, on light module 100, each LED set in the LED system 120 is associated with a programming resistor that combines with other components, described below, to program the maximum current through each set of LEDS. Between pin 124 and 126 is resistor 122, six and two-tenths ohms. Between pin 144 and 146 is resistor 142, four and seven-tenths ohms. Between pin 164 and 166 is resistor 162, four and seven-tenths ohms. Resistor 122 programs maximum current through red LED set 121, resistor 142 programs maximum current through blue LED set 140, and resistor 162 programs maximum current through green LED set 160. The values these resistors should take are determined empirically, based on the desired maximum light intensity of each LED set. In the embodiment depicted in
As shown in
In an embodiment of the invention, data and power input unit 18 has four pins, including a power supply 1, which may be a twenty-four volt LED power supply, a processor power supply 2, which may be a five volt processor power supply, a data in line 3 and a ground pin 4. The first power supply 1 provides power to LED channels 14 of LED assembly 12. The second processor power supply 2 may be connected to power supply input 20 of processor 16 to provide operating power for the processor 16 and also may be connected to a pin 1 of the processor 16 to tie the reset high. A capacitor 24, such as a one-tenth microfarad capacitor, may be connected between the processor power supply 2 and ground. The data line 3 may be connected to pin 18 of processor 16 and may be used to program and dynamically control the processor 16. The ground may be connected to pins 8 and 19 of the processor 16.
LED assembly 12 may be supplied with power from the LED power supply 1 and may contain a transistor-controlled LED channel 14. The LED channel 14 may supply power to at least one LED. As shown in
As shown in
Referring again to
A resistor 28 may be connected between transistor 26 and ground. In the illustrated example, resistor 28 associated with the red LED has a resistance value of sixty-two ohms, and the resistors associated with the green and blue LEDs each have a resistance of ninety ohms. A capacitor 29 may be connected between the first LED power supply 1 and ground. In the illustrated embodiment, this capacitor has a value of one-tenth of a microfarad.
Processor 16 may be connected to an oscillator 19. One acceptable oscillator is a crystal tank circuit oscillator which provides a twenty mega Hertz clock. This oscillator may be connected to pins 9 and 10 of processor 16. It is also possible to use an alternative oscillator. Primary considerations associated with selection of an oscillator are consistency, operating speed and cost.
In an embodiment of the invention, processor 16 is a programmable integrated circuit, or PIC chip, such as a PIC 16C63 or PIC 16C66 manufactured by Microchip Technology, Inc. A complete description of the PIC 16C6X series PIC chip (which includes both the PIC 16C63 and PIC 16C66) is attached to the U.S. Provisional Patent Application filed on Dec. 17, 1997, entitled Digitally Controlled Light Emitting Diode Systems and Methods, to Mueller and Lys, and is incorporated by reference herein. Although the PIC 16C66 is currently the preferred microprocessor, any processor capable of controlling the LEDs 15 of LED assembly 12 may be used. Thus, for example, an application specific integrated circuit (ASIC) may be used instead of processor 16. Likewise, other commercially available processors may also be used without departing from this invention.
In an embodiment of the invention depicted in
The responsiveness of LEDs to changing electrical signals permits computer control of the LEDs via control of the electrical impulses delivered to the LEDs. Thus, by connecting the LED to a power source via a circuit that is controlled by a processor, the user may precisely control the color and intensity of the LED. Due to the relatively instantaneous response of LEDs to changes in electrical impulses, the color and intensity state of an LED may be varied quite rapidly by changes in such impulses. By placing individual LEDs into arrays and controlling individual LEDs, very precise control of lighting conditions can be obtained through use of a microprocessor. The processor 16 may be controlled by conventional means, such as a computer program, to send the appropriate electrical signals to the appropriate LED at any given time. The control may be digital, so that precise control is possible. Thus, overall lighting conditions may be varied in a highly controlled manner.
With the electrical structure of an embodiment of light module 100 described, attention will now be given to the electrical structure of an example of a power module 200 in one embodiment of the invention, shown in
Also connected to pin connector 210 are three current programming integrated circuits, ICR 220, ICB 240 and ICG 260. Each of these may be a three terminal adjustable regulator, such as part number LM317B, available from the National Semiconductor Corporation, Santa Clara, Calif. The teachings of the LM317 datasheet are incorporated herein by reference. Each regulator contains an input terminal, an output terminal and an adjustment terminal, labeled I, O, and A, respectively. The regulators function to maintain a constant maximum current into the input terminal and out of the output terminal. This maximum current is pre-programmed by setting a resistance between the output and the adjustment terminals. This is because the regulator will cause the voltage at the input terminal to settle to whatever value is needed to cause one and twenty-five hundredths volts to appear across the fixed current set resistor, thus causing constant current to flow. Since each functions identically, only ICR 220 will now be described. First, current enters the input terminal of ICR 220 from pin 228. Pin 228 in the power module is coupled to pin 128 in the light module and receives current directly from the cathode end of the red LED system 121. Since resistor 122 is ordinarily disposed between the output and adjustment terminals of ICR 220 through pins 224/124 and 226/126, resistor 122 programs the amount of current regulated by ICR 220. Eventually, the current output from the adjustment terminal of ICR 220 enters a Darlington driver. In this way, ICR 220 and associated resistor 122 program the maximum current through red LED system 120. Similar results are achieved with ICB 240 and resistor 142 for blue LED set 140, and with ICG 260 and resistor 162 for green LED set 160.
The red, blue and green LED currents enter another integrated circuit, ICI 380, at respective nodes 324, 344 and 364. ICI 380 may be a high current/voltage Darlington driver, such as part no. DS2003, available from the National Semiconductor Corporation, Santa Clara, Calif. ICI 380 may be used as a current sink, and may function to switch current between respective LED sets and ground 390. As described in the DS2003 datasheet, incorporated herein by reference, ICI contains six sets of Darlington transistors with appropriate on-board biasing resistors. As shown, nodes 324, 344 and 364 couple the current from the respective LED sets to three pairs of these Darlington transistors, in the well known manner to take advantage of the fact that the current rating of ICI 380 may be doubled by using pairs of Darlington transistors to sink respective currents. Each of the three on-board Darlington pairs is used in the following manner as a switch. The base of each Darlington pair is coupled to signal inputs 424, 444 and 464, respectively. Hence, input 424 is the signal input for switching current through node 324, and thus the red LED set 121. Input 444 is the signal input for switching current though node 344, and thus the blue LED set 140. Input 464 is the signal input for switching current through node 364, and thus the green LED set 160. Signal inputs 424, 444 and 464 are coupled to respective signal outputs 434, 454 and 474 on microcontroller IC2 400, as described below. In essence, when a high frequency square wave is incident on a respective signal input, ICI 380 switches current through a respective node with the identical frequency and duty cycle. Thus, in operation, the states of signal inputs 424, 444 and 464 directly correlate with the opening and closing of the power circuit through respective LED sets 121, 140 and 160.
The structure and operation of microcontroller IC2 400 in the embodiment of
Microcontroller IC2 400 is powered through pin 450, which is coupled to a five volt source of DC power 700. Source 700 is preferably driven from supply 300 through a coupling (not shown) that includes a voltage regulator (not shown). An exemplary voltage regulator is the LM340 3-terminal positive regulator, available from the National Semiconductor Corporation, Santa Clara, Calif. The teachings of the LM340 datasheet are hereby incorporated by reference. Those of skill in the art will appreciate that most microcontrollers, and many other independently powered digital integrated circuits, are rated for no more than a five volt power source. The clock frequency of microcontroller IC2 400 is set by crystal 480, coupled through appropriate pins. Pin 490 is the microcontroller IC2 400 ground reference.
Switch 600 is a twelve position dip switch that may be alterably and mechanically set to uniquely identify the microcontroller IC2 400. When individual ones of the twelve mechanical switches within dip switch 600 are closed, a path is generated from corresponding pins 650 on microcontroller IC2 400 to ground 690. Twelve switches create twenty-four possible settings, allowing any microcontroller IC2 400 to take on one of four thousand ninety-six different IDs, or addresses. In the embodiment of
Once switch 600 is set, microcontroller IC2 400 “knows” its unique address (“who am I”), and “listens” on serial line 520 for a data stream specifically addressed to it. A high speed network protocol, such as a DMX protocol, may be used to address network data to each individually addressed microcontroller IC2 400 from a central network controller (not shown). The DMX protocol is described in a United States Theatre Technology, Inc. publication entitled “DMX512/1990 Digital Data Transmission Standard for Dimmers and Controllers,” incorporated herein by reference. Basically, in the network protocol used herein, a central controller (not shown) creates a stream of network data consisting of sequential data packets.
Each packet first contains a header, which is checked for conformance to the standard and discarded, followed by a stream of sequential characters representing data for sequentially addressed devices. For instance, if the data packet is intended for light number fifteen, then fourteen characters from the data stream will be discarded, and the device will save character number fifteen. If as in the preferred embodiment, more than one character is needed, then the address is considered to be a starting address, and more than one character is saved and utilized. Each character corresponds to a decimal number zero to two hundred fifty-five, linearly representing the desired intensity from Off to Full. (For simplicity, details of the data packets such as headers and stop bits are omitted from this description, and will be well appreciated by those of skill in the art.) This way, each of the three LED colors is assigned a discrete intensity value between zero and two hundred fifty-five. These respective intensity values are stored in respective registers within the memory of microcontroller IC2 400 (not shown). Once the central controller exhausts all data packets, it starts over in a continuous refresh cycle. The refresh cycle is defined by the standard to be a minimum of one thousand one hundred ninety-six microseconds, and a maximum of one second.
Microcontroller IC2 400 is programmed continually to “listen” for its data stream. When microcontroller IC2 400 is “listening,” but before it detects a data packet intended for it, it is running a routine designed to create the square wave signal outputs on pins 434, 454 and 474. The values in the color registers determine the duty cycle of the square wave. Since each register can take on a value from zero to two hundred fifty five, these values create two hundred fifty six possible different duty cycles in a linear range from zero percent to one hundred percent. Since the square wave frequency is uniform and determined by the program running in the microcontroller IC2 400, these different discrete duty cycles represent variations in the width of the square wave pulses. This is known as pulse width modulation (PWM).
In one embodiment of the invention, the PWM interrupt routine is implemented using a simple counter, incrementing from zero to two hundred fifty-five in a cycle during each period of the square wave output on pins 434, 454 and 474. When the counter rolls over to zero, all three signals are set high. Once the counter equals the register value, signal output is changed to low. When microcontroller IC2 400 receives new data, it freezes the counter, copies the new data to the working registers, compares the new register values with the current count and updates the output pins accordingly, and then restarts the counter exactly where it left off. Thus, intensity values may be updated in the middle of the PWM cycle. Freezing the counter and simultaneously updating the signal outputs has at least two advantages. First, it allows each lighting unit to quickly pulse/strobe as a strobe light does. Such strobing happens when the central controller sends network data having high intensity values alternately with network data having zero intensity values at a rapid rate. If one restarted the counter without first updating the signal outputs, then the human eye would be able to perceive the staggered deactivation of each individual color LED that is set at a different pulse width. This feature is not of concern in incandescent lights because of the integrating effect associated with the heating and cooling cycle of the illumination element. LEDS, unlike incandescent elements, activate and deactivate essentially instantaneously in the present application. The second advantage is that one can “dim” the LEDs without the flickering that would otherwise occur if the counter were reset to zero. The central controller can send a continuous dimming signal when it creates a sequence of intensity values representing a uniform and proportional decrease in light intensity for each color LED. If one did not update the output signals before restarting the counter, there is a possibility that a single color LED will go through nearly two cycles without experiencing the zero current state of its duty cycle. For instance, assume the red register is set at 4 and the counter is set at 3 when it is frozen. Here, the counter is frozen just before the “off part” of the PWM cycle is to occur for the red LEDS. Now assume that the network data changes the value in the red register from four to two and the counter is restarted without deactivating the output signal. Even though the counter is greater than the intensity value in the red register, the output state is still “on”, meaning that maximum current is still flowing through the red LEDS. Meanwhile, the blue and green LEDs will probably turn off at their appropriate times in the PWM cycle. This would be perceived by the human eye as a red flicker in the course of dimming the color intensities. Freezing the counter and updating the output for the rest of the PWM cycle overcomes these disadvantages, ensuring the flicker does not occur.
The microprocessors that provide the digital control functions of the LEDs of the present invention may be responsive to any electrical signal; that is, external signals may be used to direct the microprocessors to control the LEDs in a desired manner. A computer program may control such signals, so that a programmed response to given input signals is possible. Thus, signals may be generated that turn individual LEDs on and off, that vary the color of individual LEDs throughout the color spectrum, that strobe or flash LEDs at predetermined intervals that are controllable to very short time intervals, and that vary the intensity of light from a single LED or collection of LEDs. A variety of signal-generating devices may be used in accordance with the present invention to provide significant benefits to the user. Input signals can range from simple on-off or intensity signals, such as that from a light switch or dial, or from a remote control, to signals from detectors, such as detectors of ambient temperature or light. The precise digital control of arrayed LEDs in response to a wide range of external signals permits applications in a number of technological fields in accordance with the present invention.
The network interface for microcontroller IC2 400 will now be described. Jacks 800 and 900 are standard RJ-45 network jacks. Jack 800 is used as an input jack, and is shown for simplicity as having only three inputs: signal inputs 860, 870 and ground 850. Network data enters jack 800 and passes through signal inputs 860 and 870. These signal inputs are then coupled to IC3 500, which is an RS-485/RS-422 differential bus repeater of the standard type, preferably a DS96177 from the National Semiconductor Corporation, Santa Clara, Calif. The teachings of the DS96177 datasheet are hereby incorporated by reference. The signal inputs 860, 870 enter IC3 500 at pins 560, 570. The data signal is passed through from pin 510 to pin 520 on microcontroller IC2 400. The same data signal is then returned from pin 540 on IC2 400 to pin 530 on IC3 500. Jack 900 is used as an output jack and is shown for simplicity as having only five outputs: signal outputs 960, 970, 980, 990 and ground 950. Outputs 960 and 970 are split directly from input lines 860 and 870, respectively. Outputs 980 and 990 come directly from IC3 500 pins 580 and 590, respectively. It will be appreciated that the foregoing assembly enables two network nodes to be connected for receiving the network data. Thus, a network may be constructed as a daisy chain, if only single nodes are strung together, or as a tree, if two or more nodes are attached to the output of each single node.
From the foregoing description, one can see that an addressable network of LED illumination or display units can be constructed from a collection of power modules each connected to a respective light module. As long as at least two primary color LEDs are used, any illumination or display color may be generated simply by preselecting the light intensity that each color LED emits. Further, each color LED can emit light at any of 255 different intensities, depending on the duty cycle of PWM square wave, with a full intensity generated by passing maximum current through the LED. Further still, the maximum intensity can be conveniently programmed simply by adjusting the ceiling for the maximum allowable current using programming resistances for the current regulators residing on the light module. Light modules of different maximum current ratings may thereby be conveniently interchanged.
In an alternative embodiment of the invention, a special power supply module 38 is provided, as depicted in
The power supply module 38 may further include a boost converter 52. The boost converter takes a low voltage direct current and boosts and cleans it to provide a higher voltage to the DC power input 18 of the circuit 10 of
In the illustrated embodiment, the boost converter 52 is capable of taking power at approximately ten volts and converting it to a clean power at twenty-four volts. The twenty-four volt power can be used to power the circuit 10 and the LEDs 15 of
In certain embodiments of the invention, power and data are supplied to the circuit 10 and the LEDs 15 by conventional means, such as a conventional electrical wire or wires for power and a separate wire, such as the RS-485 wire, for data, as in most applications of the DMX-512 protocol. For example, in the embodiment of
In another embodiment, electrical power and serial data are simultaneously supplied to the device, which may be a lighting device such as the LED-based lighting device of
In an embodiment of the invention, the power supply module 38 recovers power from data lines. In order to permit power recovery from data lines, a power data multiplexer 60 is provided, which amplifies an incoming data stream to produce logical data levels, with one or more of the logical states having sufficient voltage or current that power can be recovered during that logical state. Referring to
The power data multiplexer 60 may include a data input element 68 and a data output element 70. The data output element 70 may include an output element 72 that supplies combined power and data to a device, such as the power supply module 38 of
In this embodiment, the voltage is sufficient to supply power while maintaining the logical data values of the data stream. The chip 82 may be any conventional chip capable of taking an input signal and amplifying it in a selected direction to a larger voltage. It should be understood that any circuit for amplifying data while maintaining the logical value of the data stream may be used for the power data multiplexer 60.
The embodiments of
In an embodiment of the invention, the data supplied to the power data multiplexer 60 is data according to the USITT DMX-512 protocol, in which a constant stream of data is transmitted from a console, such as a theatrical console, to all devices on the DMX-512 network. DMX-512 formats are enforced upon the data. Because of this one can be assured that the power data multiplexer 60, either in the embodiment depicted in
The resulting higher power signal from the power data multiplexer 60 can be converted back into separated power by the power supply module 38, or by another circuit capable of providing rectification with a diode and filtering with a capacitor for the power.
The data stream from the power data multiplexor 60 can be recovered by simple resistive division, which will recover a standard data voltage level signal to be fed to the input 18. Resistive division can be accomplished by the resistors 84 of
The power data multiplexer 62, when combined with the power supply module 38 and the array 37 mounted on a modular platform 30, permits the installation of LED-based, digitally controlled lighting using already existing wires and fixtures. As the system permits the device to obtain power and data from a single pair of wires, no separate data or power wires are required. The power data multiplexor 60 can be installed along a conventional data wire, and the power supply module 38 can be installed on the platform 30. Thus, with a simple addition of the power data multiplexor 60 and the insertion of the modular platform 30 into a conventional halogen fixture, the user can have LED based, digitally controlled lights by supplying DMX-512 data to the power data multiplexor 60.
It should be understood that the power supply module 38 can be supplied with standard twelve volt alternating current in a non-modified manner. That is, the power supply module can supply the array 37 from alternating current present in conventional fixtures, such as MR-16 fixtures. If digital control is desired, then a separate data wire can be supplied, if desired.
Another embodiment of a power data multiplexor 60 is depicted in
The voltage at 803 is eight volts greater than the supply voltage. The voltage at 805 is about negative eight volts. The voltage at 801 is five volts. The power data multiplexor 60 may include decoupling capacitors 807 and 809 for the input power supply. A voltage regulator 811 creates a clean, five volt supply, decoupled by capacitor 813. A voltage regulator 815, which may be an LM317 voltage regulator available from National Semiconductor, forms an eighteen volt voltage regulator with resistors 817 and 819, decoupled by capacitors 821 and 823. The teachings of the LM317 data sheet are incorporated by reference herein. This feeds an adjustable step down regulator 823, which may be an LT1375 step down regulator available from Linear Technology of Milpitas Calif., operated in the voltage inverting configuration. The teachings of the LT1375 data sheet are incorporated by reference herein. The resistances of resistors 817 and 819 have been selected create negative eight volts, and a diode 844 is a higher voltage version than that indicated in the data sheet, inductor 846 is may be any conventional inductor, for example, one with a value of one hundred uH to allow a smaller and cheaper capacitor to be used for the capacitor 848, supply has been further bypassed with capacitor 852. Diode 854 may be a plastic packaged version 1N914, and frequency compensating capacitor 856 sized appropriately for changes in other components according to data sheet formulas. The circuit generates negative eight volts at 805.
Also included may be a step up voltage regulator 825, which may be an LT1372 voltage regulator available from Linear Technology of Milpitas, Calif. The teachings of the LT1372 data sheet are incorporated by reference herein. The step up voltage regulator may be of a standard design. Diode 862 may be a diode with higher voltage than that taught by the data sheet. Inductor 864 and capacitor 839 may be sized appropriately according to data sheet formulas to generate eight volts more than input voltage over the range between input voltages of twelve and twenty-four volts. Capacitor 866 may be sized for frequency compensation given values of inductor 864 and capacitor 868 as per data sheet guidelines. A set of resistors 827, 833, 837, along with transistors 829 form the voltage feedback circuit. Resistors 833 and 837 form a voltage divider, producing a voltage in proportion to the output voltage 803 at the feedback node pin 835. Resistors 827 and transistors 829 form a current mirror, drawing a current from the feedback node at 835 in proportion to the input voltage. The voltage at feedback pin 835 is thus proportional to the output voltage minus the input voltage. The ratio of resistor 833 to that of resistor 837, which may need to be equal to resistor 827 for the subtraction to work, is chosen to produce eight volts. Capacitors 839 may be used to further bypass the supply.
Incoming data, which may be in the form of an incoming RS-485 protocol data stream, is received by a receiver chip 841 at the pins 843 and 845, buffered, and amplified to produce true and complement data signals at pins 847 and 849 respectively. These signals are further buffered and inverted by element 851 to produce true and complement data signals with substantial drive capabilities at pins 853 and 855, respectively.
Each of the signals from the pins 853 and 855 is then processed by an output amplifier. There are two output amplifiers 857 and 859, which may be substantially identical in design and function. In each case, the data signal entering the amplifier connected to two switched cascode type current sources 861 and 863, the first composed of resistor 865 and transistor 867, the second composed of resistor 869 and transistor 871, at the junction of the two resistors 865 and 869. The current source 863 will sink a current of approximately 20 milliamps when the signal entering the amplifier is low, such as at zero volts, and will sink no current when the signal is high, for example at positive five volts. The other current source 861 will source approximately twenty milliamperes when the signal is high, but not when low. These currents are fed to two current mirrors 873 and 875, composed of transistors 877 and 879 and resistors 881 and 883 for current source 863 and transistors 885 and 887 and resistors 889 and 891 for current source 861, which are of a standard design, familiar to analog circuit designers. The collectors of transistors 877 and 885 are connected together, forming a current summing node. The net current delivered to this node by these transistors will be about twenty milliamps in either the sourcing direction (flowing into the node) if the input signal is low, or the sinking direction (flowing out of the node) if the signal is high. When a transition from the low state to the high state occurs at the input signal, the resulting twenty milliampere sinking current will cause capacitor 893 (and the parasitic capacitance at this node) to discharge at a controlled rate of approximately fifty volts per microsecond, until the voltage at the node reaches approximately negative five volts, at which time diodes 895 and 897 will begin to conduct, clamping the negative excursion of the node voltage at negative five volts, and preventing the saturation of transistor 885. Transistors 899 and 901 form a bi-directional Class B voltage follower of a standard design, and the voltage at the junction of their emitters follows the transition at the node connected to capacitor 893. Specifically transistor 899 turns off and transistor 901 conducts, causing the voltage at the gates of transistors 903 and 907 to decrease, switching off transistor 903 and slowly turning on transistor 907, causing current to flow from the output pin 909 to ground. Field effect transistors 903 and 907, which may be of the type available from National Semiconductor of Santa Clara, Calif., also form a Class B Voltage follower, of standard design. When the voltage at the current summing node is clamped at negative five volts, the voltage at the gate of 903 will reach negative four and four-tenths volts, and transistor 907 will remain on so long as the input signal remains high.
Once the input signal goes low, the current at the summing node will change direction, and capacitor 893 will charge at the same rate, eventually being clamped to a value of the input voltage plus five volts. Transistor 899 will cause the voltage at the gates of transistor 903 and transistor 905 to rise, turning off transistor 903 and turning on transistor 907, sourcing current from the input supply to the output through resistor 911. It will take approximately five hundred nanoseconds for the voltage at the summing node, and hence the output, to fully switch between zero and twenty-four volts (if the power input is the maximum of twenty four volts), or approximately two hundred fifty nanoseconds to move between zero and twelve volts (if the power input is twelve volts). Transistor 905 and resistor 911 form a short circuit protection circuit, limiting the current flowing through 903 to approximately six amperes. Diode 913 isolates the short circuit protector circuit when transistor 903 is not on. No protection is provided for transistor 907, because the expected short circuit paths would be either to ground or to the other amplifier channel. In the first case no current could flow through transistor 907, while in the second, the other amplifier's short circuit protection would protect transistor 907.
Because of the bridge rectifier at the input to the device, as disclosed in connection with the description of the embodiment of
The circuit of
The lamps themselves auto terminate the line, as their input looks substantially similar to the terminating circuit in the track embodiment described below, having the same effect as that terminating circuit. This eliminates any need for terminators on the line. Additional termination is only needed in the case of a device that is commanded to be off, with actual data wire impedance low, with a long wire, and where there are many transitions going by. Since this is a very unlikely combination of factors, the configuration with an additional terminator is not needed as a practical matter.
For the embodiment of
In an embodiment of the invention, a modified method and system is provide to provide multiple simultaneous high speed pulse width modulated signals. The method may be accomplished by computer software coding of the steps depicted in the flow charts 202 and 205 of
In each sub-period, which begins with an interrupt at a step 213, the interrupt routine executes the steps of the flow chart 205. In a step 214, all PWM signals are updated from pre-computed values corresponding to this specific sub-period. In most cases this entails a single read from an array of pre-computed values, followed by a single write to update the multiple I/O pins on which the PWM signals are generated.
In a step 218, one of the PWM signals is then modified. The step 218 is accomplished by executing a write to the I/O pins, executing a series of instructions consuming the desired amount of time, and then executing another update (I/O) write.
In a step 222, the processor advances the sub-period bookkeeping value to point to the next sub-period.
The vernier in the step 218 can reduce or increase the amount of time that the PWM signal is on, by changing the state of the signal for up to one-half of the sub-period. There are two possible cases. Either the coarse update places the signal in the “off” state and the vernier routine turns it “on” for a time period of up to one-half of the sub period, or the coarse update is “on” and the vernier routine turns the signal “off” for a period of time of up to one-half of the sub period.
Using this method, each PWM signal can change multiple times per PWM period. This is advantageous because software can use this property to further increase the apparent PWM frequency, while still maintaining a relatively low interrupt rate.
The method disclosed thus far consumes a maximum of approximately half of the processor time compared to conventional PWM routines.
As an example: consider two signals A and B with a resolution of twenty counts programmed to seven and fourteen counts respectively. These signals could be generated as follows:
In this example the pre-computed update value at P.sub.i=1 is both signals on. Signal A then spends some time in the on state, while the interrupt routine continues to execute. A then goes off in the vernier step at the first “v”, and the interrupt routine executes time delay code during the time before restoring the signal to the on state at the second “v”.
The actual time between the multiple update at the beginning of the sub period and the vernier update need not be known, so long as the time spent between the vernier updates is the desired time. While the vernier updates are occurring, signal B, which was switched on, remains on and un-affected. When the second interrupt occurs, both signals are switched off, and the vernier routine now adds four additional counts to the period of signal B. In this example only thirty-five percent of the processor time plus the time required for two interrupts has been consumed.
Since only one vernier period is required per signal generated, increasing the number of periods per PWM cycle can generate non-uniform PWM waveforms at frequencies higher than those possible on most microprocessors' dedicated hardware PWM outputs for a large number of possible PWM channels. The microprocessor still executes interrupts at fixed intervals.
To change the duty cycles of the signals produced, the software can asynchronously update any or all of the coarse or vernier values, in any order, without having to worry about synchronization with the interrupt routine, and more importantly, without stopping it. The interrupt routine never changes any variables which the main code changes or vice-versa. Thus there is no need for interlocks of any kind.
This software routine can thus utilize a single timer to generate multiple PWM signals, with each signal ultimately having the resolution of a single processor cycle. On a Microchip PIC microprocessor, this allows three PWM signals to be generated with a resolution of two hundred fifty-six counts, each corresponding to only a four instruction delay. This allows a PWM period of just one thousand twenty four instruction cycles, i.e four thousand eight hundred eighty two Hertz at a twenty megaHertz clock.
Furthermore, for counts between sixty-four and one hundred ninety-two, the PWM waveform is a non-uniform nine thousand seven hundred sixty-five Hertz signal, with much lower noise than a conventional PWM generator in such a processor.
As described above, the LED arrays of the present invention are responsive to external electrical signals and data. Accordingly, it is desirable to have improved data and signal distribution mechanisms in order to take full advantage of the benefits of the present invention. In an embodiment of the invention, the data connection 500 can be a DMX or lighting data network bus disposed in a track on which conventional lights or LEDs are located. Thus, a track capable of delivering data signals may be run inside a track lighting apparatus for LEDs or conventional lights. The data signals may then be controlled by a microprocessor to permit intelligent individual control of the individual lamps or LEDs. It is within the scope of the present invention to provide distributed lights that are responsive to both electrical and data control.
The LEDs of the present invention are highly responsive to changes the input signal. Accordingly, to take advantage of the features of the invention, rapid data distribution is desirable. In embodiment of the invention, a method for increasing the communication speed of DMX-512 networks is provided. In particular, DMX 512-networks send data at two hundred fifty-thousand baud. All receivers are required by the DMX standard to recognize a line break of a minimum of eighty-eight microseconds. After the mark is recognized, all devices wait to receive a start code and ignore the rest of the packet if anything other than zero was received. If a non-zero start code is sent prior to sending data at a higher baud rate, the devices are able to respond more quickly to the higher baud rate. Alternatively channels above a certain number could be assigned to the high baud rate, and other devices would not be deprived of necessary data as they would already have received their data from that frame. It may be desirable to frame several characters with correct stop bits to prevent loss of synchronization.
The present invention may also include an automation system chassis that consists of a mother board that communicates with a network and/or bus using the DMX, Ethernet or other protocol to control a wide range of electrical devices, including the LED arrays of the present invention.
In another embodiment of the invention, the input signals for the microprocessor can be obtained from a light control network that does not have a direct electrical circuit connection. A switch that is mounted on a wall or a remote control can transmit a programmed infrared, radio frequency or other signal to a receiver which can then transmit the signal to the microprocessor.
Another embodiment provides a different track lighting system. Present track lighting systems use both the physical and electrical properties of a track of materials, which typically consist of an extruded aluminum track housing extruded plastic insulators to support and house copper conductors. A conventional track lighting system delivers power and provides a mechanical support for light fixtures, which can generally be attached to the “track” at any location along its length by a customer without tools.
In the simplest form, a track provides only two conductors, and all fixtures along the track receive power from the same two conductors. In this situation, all fixtures attached to the track are controlled by a single control device. It is not possible to control remotely (switch on or off, or dim) a subset of the fixtures attached to the track without affecting the other fixtures.
Track systems have generally included more than two conductors, primarily because of the requirements of the Underwriters Laboratories for a separate ground conductor. Many systems have also endeavored to provide more than just two current-carrying conductors. The purpose of additional current-carrying conductors is typically either to increase the total power carrying capacity of the track, or to provide separate control over a subset of fixtures. Tracks with up to four “circuits,” or current-carrying conductors, are known.
Even with four circuits however, full flexibility may not be achieved with conventional tracks, for a number of reasons. First, a fixture is assigned to a subset at the time of insertion into the track. Thus, that fixture will be affected by signals for the particular subset. If there are more lights than circuits, it is not possible to control lights individually with conventional systems. Also, the fixture typically only receives power, which can be modified somewhat (i.e. dimmed), but cannot easily be used to send substantial quantities of data. Further, information cannot be returned easily from the fixtures.
The track embodiment disclosed herein provides individual control of a large number of lighting fixtures installed on a track and allows robust bidirectional communication over that track, while complying with regulatory requirements pertaining to both safety and pertaining to elimination of spurious radio frequency emissions. Disclosed herein are methods and systems for creating electrical signals for delivering data to a multitude of lighting fixtures attached to a track, a track capable of delivering the signals to the fixtures, and specialized termination devices for ensuring that the signals do not cause excessive spurious reflections.
DMX-512 specifies the use of RS-485 voltage signaling levels and input/output devices. However, use of RS-485 presents certain problems in the track lighting applications described herein, because it requires that the network to which the fixture 6000 is attached be in the form of a bus, composed of lengths of controlled impedance media, and it requires that the network be terminated at each bus endpoint. These properties are not provided in typical track lighting systems, which generally do not contain controlled impedance conductor systems. Furthermore, track installations often contain branches or “Ts” at which one section of track branches to multiple other sections, and it is undesirable to electrically regenerate signals at such points, for cost, reliability and installation reasons. Because of this, each section cannot be “terminated” with its characteristic impedance to achieve a properly terminated network for purposes of RS-485.
It is possible however, through the present invention, to send signals conforming to a modification of the RS-485 specification, which can be received by currently available devices that conform to the RS-485 specification.
To deliver data effectively in this environment, a new data transmitter 6004 is needed. In order to negate the transmission line effect created by the multiple sections of track, a controlled waveshape driver is utilized as the data transmitter 6004. The design of this driver may be further optimized to minimize the amount of unintended radio frequency radiation, to allow conformance to FCC and CE regulatory requirements. To further ensure signal integrity, a specialized termination network may be utilized.
Certain characteristics of the track system are relevant. First, multiple sections of track can be viewed as a collection of individual transmission lines, each with some (generally unknown) characteristic impedance, and with some unknown length. Fixtures attached to the track present some load along the transmission line's length. The RS-485 standard specifies that the minimum impedance of such loads shall be not less than ten and five-tenths kilo-ohms, and that the added capacitance must not exceed fifty picofarads. In a large lighting network, it is possible to envision a track system comprised of several dozen sections, each up to several meters long. The total number of fixtures can easily exceed two hundred in just a single room. Thus the total load presented by the controlled devices alone can be below fifty ohms and contain an added ten thousand picofarads of capacitance. Furthermore, crosstalk between the power conductors and signal conductors in the track can also occur. The track itself may present upwards of twenty-five picofarads per foot of additional capacitance.
It is generally understood that transmission lines shorter than one-fourth of the wavelength of the highest frequency signal transmitted on them can be analyzed and viewed as a lumped load; i.e., their transmission line effects can be effectively ignored. Thus any combination of loads and track sections can be viewed as a single lumped load, so long as the maximum length from any one terminus to any other terminus is less than one-fourth of the wavelength of the highest frequency signal delivered to it. For a digital signal, the highest frequency component is the edge, at which the signal transitions between the two voltage states representing a logical one and a logical zero. The DMX-512 lighting control protocol specifies a data transmission rate of two hundred fifty thousand bits per second. The signal edge transition time required to reliably transmit such a signal is at least five times faster than that rate; i.e., the transition must occur in no longer than eight hundred nanoseconds, in order to assure reliable data transmission. If we assume that a data driver capable of creating electrical signals which transition at this rate can be constructed, that the speed of light is three times ten to the eighth meters per second, and that the velocity of propagation in track is approximately seventy percent of the speed of light, then a conservative limit on the maximum network length is about forty-two meters. This is an adequate length for most applications. Assuming that the total length of a branched network might be as much as two such forty-two meter track sections, a total capacitance added by the track itself could be as much as another seven thousand picofarads, for a total load of seventeen thousand picofarads.
In order to effectively transmit data into such a network, a driver with significantly more power than a driver for the current RS-485 standard is required. To achieve a five volt transition, for a highly loaded network as described above, the driver is preferably capable of supplying at least one hundred milliamps continuously for the resistive portion of the load, and at least one hundred milliamps additionally during the transition period, which will be absorbed by the capacitive load. Thus the driver output current is preferably at least two hundred milliamps to ensure adequate margin. A circuit design for a driver 6004 which meets these criteria is illustrated in
In order to effectively propagate signals along the length of a track, the track's data conductors should have a low resistance per unit length, ideally less than that needed to deliver one and one-half volts of signal to all receivers as specified in the RS-485 standard. In a highly loaded network (with all loads being at the end), this is approximately nine one-hundredths ohms per foot. This includes the intermediate connectors, so the track conductor's resistance should ideally be much lower than this figure. The track's inductive effect will also contribute to signal degradation.
In order to compensate for the inductive effect of the track, limited termination may be provided at the endpoint of each branch. This termination is preferably not purely resistive, but rather compensates only for the inductive effect of the track. A circuit design for a suitable terminator 6008 is shown in
Recovering data from the track then becomes a matter of attaching (using any of the commonly used attachment methods, e.g., spring clips) to the electrical and mechanical attachment points of the track itself. Many examples of track lighting attachment are well known to those of ordinary skill in the art. One example is the Halo Power Track provided by Cooper Lighting.
Once both the power and data are available on a wire, for example, we can use the network version of the light modules 100 described above, or any digitally controlled dimmer, to achieve individual control over the lighting unit. The data can correspond not only to light intensity, but also to control effects, such as moving a yoke, gobo control, light focus, or the like. Moreover, the system can be used to control non-lighting devices that are RS-485 compliant.
It is further possible, by using this embodiment, to create devices which can respond over the same data conductors or over a separate pair, using substantially similar drivers, possibly with added circuitry to allow the driver(s) to be electrically disconnected from the data conductors during times when the device is not selected for a response, i.e., to allow bus sharing. Units can send status information to the driver, or information can be provided to the units through other means, such as radio frequency, infrared, acoustic, or other signals.
Referring again to
The incoming RS-485 data stream may be received by the RS-485 receiver chip 6034 at pins 6038 and 6040. The data stream may be further buffered by the receiver chip 6034 to produce a clean, amplified true and complement data signals at pins 6042 and 6044, respectively. These signals are further buffered and inverted by buffer 6048 to produce true and complement data signals with substantial drive capabilities at pins 6050 and 6052 respectively. Each of these signals is then processed by an output amplifier. There are two output amplifiers 6054 and 6058, identical in design and function.
Each amplifier 6054 and 6058 draws power from the previously described power supplies, and both amplifiers share the bias voltage generator network composed of resistors 6060, 6062 and 6064. Amplifier 6054 is composed of all parts to the left of this network on
The bias network generates two bias voltages, nominally positive six and four-tenths volts, and negative one and four-tenths volts, appearing at the base of transistors 6068 and 6070, respectively. Transistor 6068 and resistor 6072 form a constant current source 6074, sourcing a current of approximately twenty milliamps from the collector of transistor 6068. Similarly transistor 6078 and resistor 6080 provide a current sink 6082 to sink a current of twenty milliamps from the collector of transistor 6078. Diodes 6010, 6084, 6088, 6090, 6092 and 6094 form a current steering network 6098 and steer the twenty milliamp currents alternately into the incoming data line, or capacitor 6100 (through the one volt shunt regulator composed of transistor 6102, resistor 6104 and resistor 6108 if the current is from transistor 6068). If the incoming data line switches from the low state of zero volts to the high state of positive five volts, current sink 6082 will sink current from the incoming data line, through diodes 6090 and 6092, because the voltage at the anode of 6090 will be greater than the voltage at the anode of diode 6094. Diodes 6084 and 6088 will be reverse-biased, and current will flow through 6010 and the shunt regulator 6110 comprised of transistor 6102 and resistors 6104 and 6108. The circuit node at the anode of diode 6094 will not immediately follow the transition, as capacitor 6100 must slowly charge from the current provided by transistor 6068. Capacitor 6100 will charge at a rate of approximately six and sixty-seven hundredths volts per microsecond, and will reach approximately four volts approximately seven hundred fifty nanoseconds later. At that time the voltage at the collector of transistor 6068 will become large enough to forward bias diodes 6084 and 6088, causing the current source 6074 to be steered into the input data line. As long as this data line is held in a high state (at five volts), no more current will flow through diode 6010, the shunt regulator 6110 and into capacitor 6100. The cathode of diode 6010 will remain at approximately five and five-tenths volts until the data line changes state to the low state of zero volts. During the switching as described, transistor 6112 acts as a common collector current buffer and will source as much current as is required into resistor 6114. This current will flow into the output at pin 6118 of output device 6120. The voltage at the output will thus be a slowly rising signal, whose slope is regulated by the charging of capacitor 6100 from current source 6074. A small base current will be drawn from transistor 6068 by transistor 6112, but its effect on the transition timing will be negligible.
When the incoming data line transitions to the low state, diodes 6084, 6088 and 6094 will be forward-biased, diodes 6090, 6092 and 6010 will be reverse-biased, and capacitor 6100 will discharge through diode 6094 through the current sink 6082 at similar rates to the positive transition described above. Current from current source 6074 will flow into the data line, now held at zero volts. The voltage at the anode of diode 6094 will reach negative five-tenths volts, and current will again flow through 6090 and 6092, instead of diode 6094 and transistor 6078, completing the downward transition. During this period transistor 6129 will sink as much current as necessary through resistor 6128, from the output at pin 6118 of device 6120, to cause it to follow the voltage at the anode of diode 6094. A small base current will be drawn by transistor 6129 from transistor, but its effect on the transition timing will be negligible. Transistors 6130 and 6132 in combination with resistors 6114 and 6128 protect transistors 6112 and 6129 respectively in case of a short circuit at the output, limiting the maximum possible output current (and hence the current through transistors 6112 and 6130) to approximately two hundred fifty milliamps.
The wave-shaping performed by this circuit can be implemented by a variety of different circuits. The embodiment depicted in
Excess energy stored in a transmission line would normally cause voltage excursions above five and three-tenths volts. The termination circuit 6008 of
The transistors disclosed herein may be of a conventional type, such as those provided by Zetex. The diodes may be of industry standard type. Buffer 6048 may be of industry standard type, and may be 74HC04 type. The receiver chip 6034 may be a MAX490 receiver chip made by Maxim Inc. of Sunnyvale, Calif. Other receiver chips may be used.
The foregoing embodiments may reside in any number of different housings. Turning now to
Interposed between light module 602 and power module 612 is a conductive aluminum sleeve 608, which substantially encloses the space between modules 602 and 612. As shown, a disk-shaped enclosure plate 618 and screws 622, 624, 626 and 628 seal all of the components together, and conductive sleeve 614 is thus interposed between enclosure plate 618 and power module 612. Once sealed together as a unit, the illumination apparatus may be connected to a data network as described above and mounted in any convenient manner to illuminate an area. In operation, preferably a light diffusing means will be inserted in body section 602 to ensure that the LEDs on light module 604 appear to emit a single uniform beam of light.
Another embodiment of a light module 100 is depicted in
In an embodiment of the invention depicted in
In a further embodiment of the invention, depicted in
In another embodiment of the present invention, an arrayed LED is mounted on a pan or tilt platform, in a manner similar to conventional theater lights. Known robotic lights shine a conventionally produced light beam from a bulb or tube onto a pan or tilt mirror. The arrayed LEDs of the present invention may be placed directly on the pan or tilt platform, avoiding the necessity of precisely aligning the light source with the pan or tilt mirror. Thus, an adjustable pan/tilt beam effect may be obtained similar to a mirror-based beam, without the mirror. This embodiment permits pan/tilt beam effects in more compact spaces than previously possible, because there is not a need for a separation between the source and the mirror.
Also provided is an LED based construction tile, through which a wall, floor or ceiling may be built that includes an ability to change color or intensity in a manner controlled by a microprocessor. The tile may be based on modularity similar to toy plastic building blocks. Multicolor tiles can be used to create a multicolor dance floor or shower, or a floor, wall or bathroom tile.
Also provided is a modular lighting system which allows the creation of various illuminating shapes based on a limited number of subshapes. In this embodiment of the present invention, a plurality of light emitting squares (or other geometric shapes) may be arranged into larger shapes in one, two or three dimensions. The modular blocks could communicate through physical proximity or attachment. Modular multicolor lighting blocks can be configured into different formats and shapes.
As described above, embodiments of the present invention may be utilized in a variety of manners. By way of examples, the following discussion provides different environments within which the LEDs of the present invention may be adapted for lighting and/or illumination.
Looking now at
The modular unit 4000 may further include a mechanism (not shown) for facilitating communication between a generator of control signals and the light module 4002. In one embodiment, the mechanism may include a separate transmitter and receiver, as discussed above in connection with
In an alternate embodiment, the light module 4002, as shown in
In another embodiment, the light module 4002, as shown in
The modular LED unit 4000, in certain embodiments, may be interconnected to form larger lighting assemblies. In particular, the light module 4002 may include LEDs 4006 or 4016 arranged linearly in series within a strip 4020 (
In one embodiment of the invention, the strip 4020, the geometric panel 4022 and the three-dimensional structure 4024 may be provided with a coupling mechanism (not shown) to permit coupling between modular LED units 4000. Specifically, the coupling mechanism may permit a plurality of strips 4020 to be stringed together, or a plurality of geometric panels 4022 to be connected to one another, or a plurality of three-dimensional structures 4024 to be coupled to one another. The coupling mechanism may also be designed to permit interconnection of one of a strip 4020, a geometric panel 4022, and a three-dimensional structure 4024 to another of a strip 4020, a geometric panel 4022, and a three-dimensional structure 4024. The coupling mechanism can permit either mechanical coupling or electrical coupling between the modular LED units 4000, but preferably permits both electrical and physical coupling between the modular LED units 4000. By providing an electrical connection between the modular LED units 4000, power and data signals may be directed to and between the modular LED units 4000. Moreover, such connection permits power and data to be provided at one central location for distribution to all of the modular LED units 4000. In an embodiment of the invention, data may be multiplexed with the power signals in order to reduce the number of electrical connections between the modular LED units 4000. The mechanical coupling, on the other hand, may simply provide means to securely connect the modular LED units 4000 to one another, and such function may be inherent through the provision of an electrical connection.
The modular LED unit 4000 of the present invention may be designed to be either a “smart” or “dumb” unit. A smart unit, in one embodiment, includes a microprocessor incorporated therein for controlling, for example, a desired illumination effect produced by the LEDs. The smart units may communicate with one another and/or with a master controller by way of a network formed through the mechanism for electrical connection described above. It should be appreciated that a smart unit can operate in a stand-alone mode, and, if necessary, one smart unit may act as a master controller for other modular LED units 4000. A dumb unit, on the other hand, does not include a microprocessor and cannot communicate with other LED units. As a result, a dumb unit cannot operate in a stand-alone mode and requires a separate master controller.
The modular LED unit 4000 may be used for illumination within a range of diverse environments. The manner in which the LED unit may be used includes initially placing the modular LED unit 4000 having a light module 4002, such as those provided in
An environment within which the modular LED unit 4000 may illuminate includes a handheld flashlight 4029 (
In accordance with another embodiment of the invention, a modular LED unit 4000 having a plurality of LEDs 4006 or 4016 arranged linearly in series within a strip 4020 may be also be used for illumination within an environment. One such environment, illustrated in
Another such environment, illustrated in
Another such environment, illustrated in
Another such environment, illustrated in
Another environment, illustrated in
Another environment, illustrated in
Another environment, illustrated in
Another environment, illustrated in
Another environment, illustrated in
In accordance with another embodiment of the invention, a modular LED unit 4000 having a plurality of LEDs 4006 or 4016 arranged within a geometric panel 4022 may be also be used for illumination within an environment. One such environment, illustrated in
Another environment within which a geometric panel 4022 of LEDs 4006 or 4016 may be used includes a ceiling 4043, as illustrated in
Another environment within which a geometric panel 4022 of LEDs 4006 or 4016 may be used includes a vending machine 4044, as illustrated in
Another environment within which a geometric panel 4022 of LEDs 4006 or 4016 may be used includes an illuminating surface 4045, as illustrated in
Another environment within which a geometric panel 4022 of LEDs 4006 or 4016 may be used includes a displayment sign 4046, as illustrated in
Another environment within which a geometric panel 4022 of LEDs 4006 or 4016 may be used includes a traffic light 4047, as illustrated in
Another environment within which a geometric panel 4022 of LEDs 4006 or 4016 may be used includes a directional display sign 4048, as illustrated in
Another environment within which a geometric panel 4022 of LEDs 4006 or 4016 may be used includes an information board 4049, as illustrated in
In accordance with another embodiment of the invention, a modular LED unit 4000 having a plurality of LEDs 4006 or 4016, arranged to represent a three-dimensional structure 4024, may be also be used for illumination within an environment. One such environment, illustrated in
A further environment within which the three-dimensional structure 4024 of LEDs 4006 or 4016 may be utilized includes, as shown in
A further environment within which the three-dimensional structure 4024 of LEDs 4006 or 4016 may be utilized includes an architectural glass block 4052, as shown in
A further environment within which the three-dimensional structure 4024 of LEDs 4006 or 4016 may be utilized includes a traditional lighting device 4054, as shown in
A further environment within which the three-dimensional structure 4024 of LEDs 4006 or 4016 may be utilized includes a warning tower 4055, as shown in
A further environment within which the three-dimensional structure 4024 of LEDs 4006 or 4016 may be utilized includes a buoy 4056, as shown in
A further environment within which the three-dimensional structure 4024 of LEDs 4006 or 4016 may be utilized includes a ball 4057 or puck 40571, as shown in
In accordance with another embodiment of the invention, two or more of the modular LED unit 4000 having a plurality of LEDs 4006 or 4016, arranged linearly in a strip 4020, in a geometric panel 4022 or as a three-dimensional structure 4024, may be used for illumination within an environment. One such environment, illustrated in
Another such environment, illustrated in
Another such environment, illustrated in
Another such environment, illustrated in
Another such environment, illustrated in
Another such environment, illustrated in
Another such environment, illustrated in
Another such environment, illustrated in
Another such environment, illustrated in
Another such environment, illustrated in
Another such environment, illustrated in
Although certain specific embodiments of the light module 4002 in the modular LED unit 4000 have been discussed in connection with particular environments, it should be understood that it would be apparent to those of skilled in the art to use light modules similar to those discussed within many different environments, as well as combinations of light module and environment not yet discussed, but readily conceivable.
From the foregoing, it will be appreciated that PWM current control of LEDs to produce multiple colors may be incorporated into countless environments, with or without networks. Certain embodiments of the invention are described herein, but it should be understood that other embodiments are within the scope of the invention.
Another use of the present invention is as a light bulb. Using appropriate rectifier and voltage transformation means, the entire power and light modules may be placed in any traditional lightbulb housing, such as an Edison-mount (screw-type) light bulb housing. Each bulb can be programmed with particular register values to deliver a particular color bulb, including white. The current regulator can be preprogrammed to give a desired current rating and thus preset light intensity. Naturally, the lightbulb may have a transparent or translucent section that allows the passage of light into the ambient.
In an embodiment the housing 703 may be configured to resemble the shape of housing for a conventional illumination source, such as a halogen light bulb. In one embodiment, depicted in
Processor 705 may be similar to the processor 16 disclosed in connection with the discussion of
The processor 705 may be used to control the intensity of the illumination source, the color of the illumination source 707 and other features or elements included in the housing 703 that are capable of control by a processor. In an embodiment of the invention the processor 705 controls the illumination source 707 to produce any color in the spectrum, to strobe rapidly between different colors, and to otherwise produce any desired illumination condition. Illumination sources that could disposed in a housing 703 and made subject to the processor 705 could include any type of illumination source, including the range of such sources disclosed above.
In an embodiment of the invention depicted in
The smart light bulb 701 may be part of a network of such smart light bulbs 701 as depicted in
Additional processing capabilities may be included in each smart light bulb 701. For example, each smart light bulb 701 may be made responsive to an external data signal for illumination control. For example, in the embodiment depicted in
A smart light bulb such as depicted in
The present invention may be used as a general indicator of any given environmental condition.
In another embodiment of the invention, the signal-generating device may be a detector of ambient conditions, such as a light meter or thermometer. Thus, lighting conditions may be varied in accordance with ambient conditions. For example, arrayed LEDs may be programmed to increase room light as the external light entering the room from the sun diminishes at the end of the day. LEDs may be programmed to compensate for changes in color temperature as well, through a feedback mechanism.
When coupled to transducers, many embodiments of the present invention are possible that associate some ambient condition with an LED system. As used herein, the term “transducer” should be understood to encompass all methods and systems for converting a physical quantity into an electrical signal. Electrical signals, in turn, can be manipulated by electronic circuits, digitized by analog to digital converters, and sent for processing to a processor, such as a microcontroller or microprocessor. The processor could then send out information to dictate the characteristics of the light emitted by the LED system of the present invention. In such manner, physical conditions of the environment involving external forces, temperature, particle number, and electromagnetic radiation, for example, can be made to correspond to a particular LED system. We also note that other systems involving liquid crystal, fluorescence, and gas discharge could also be used.
In a specific embodiment, a temperature transducer such as a thermocouple, thermistor, or integrated circuit (IC) temperature sensor and the light module 100 of the present invention can be used to make a color thermometer. As mentioned above, such a thermometer would emit a particular set of colors from the LED system to indicate the ambient temperature. Thus the inside of an oven or freezer having such an LED system could emit different colored lights to indicate when certain temperatures have been reached.
The enlargement of
The power module (not shown in
In another specific embodiment, a force transducer such as a differential transformer, strain gauge, or piezoelectric device and the LED system of the present invention can be used to associate a range of forces with a corresponding LED system.
Such a color speedometer 1010 could be used to “see” the angular speed of various rotating objects. Thus, as in the example of
Another specific embodiment comprising a force transducer appears in
A power module (not shown) can be coupled to the inclinometer. The inclinometer 1020 measures general angular orientation with respect to the earth's center of gravity. The inclinometer's angle signal can be converted by the A/D converter 1027 and coupled to the data inputs of the microcontroller in the power module. The microcontroller can then be programmed to assign angular orientations to different color through the use of a lookup table associating angles with LED color register values. The color inclinometer may be used for safety, such as in airplane cockpits, or for novelty, such as to illuminate the sails on a sailboat that sways in the water.
In another embodiment, the light module 100 of the present invention can be used in a color magnometer as an indicator of magnetic field strength.
The magnetic field transducer 1031 changes a magnetic field strength into an electrical signal. This signal is, in turn, converted to binary information by the A/D converter 1037. The information can then be sent as input to the microcontroller controlling the LED system 1032 to cause to shine lights of various colors that correspond to the magnetic field strength. This embodiment could find wide use in the fields of geology and prospecting, as well as in the operation of instruments that rely on magnetic fields to operate such as magnetic resonance devices, magnetrons, and magnetically focused electron devices.
In another embodiment, the light module 100 of the present invention can be used for a smoke alert system shown in
As those of ordinary skill in the art would appreciate, the smoke detector 1041 can be of either of two types: ionization or optical (photoelectric). If the latter is used, a detection chamber in the smoke detector 1041 is employed whose shape normally prevents a light sensitive element (e.g., a photocell) from “seeing” a light source (e.g., an LED). When smoke from a fire enters the chamber, it scatters light so that the light sensitive element can now detect the light. In a smoke detector 1041 employing ionization technology, radioactive materials ionize air molecules between a pair of electrodes in a detection chamber. The resultant charged air molecules permit a current to be conducted between the electrodes. The presence of smoke in the chamber, however, diminishes the amount of charged air particles and thus diminishes the current. In both types of smoke detectors, therefore, the strength of a current is indicative of the concentration of smoke particles in the detection chamber. The strength of this current can be converted by the A/D converter into binary information that can be sent to the microprocessor controlling the LED system 1042. By using a look-up table, this binary information can dictate the range of frequencies, corresponding to various smoke concentrations, that is emitted from the LED system 1042. For example, a green or red light can be emitted if the concentration of smoke particles is below or above a certain threshold. This invention could alert a person to a potential fire even if that person is incapable of hearing the smoke detector's alarm. (The person may be deaf, listening to music, or in the shower, for example.) Also, conventional detectors convey only two pieces of information: the alarm is either off, or, if sufficient smoke is in the detection chamber, on. The smoke alert system of the present invention would also convey information about the amount of smoke present by emitting characteristic colors.
Smoke is but one type of particle whose concentration can be indicated by the light module 100 of the present invention. With the use of other particle detectors such as an ionization chamber, Geiger counter, scintillator, solid-state detector, surface-barrier detector, Cerenkov detector, or drift chamber, concentrations of other types of particles such as alpha particles, electrons, or energetic photons represented by x-rays or gamma rays, can be manifested by different colored LED lights.
In another specific embodiment of the present invention, the light module 100 of the present invention can be used to build an electronic pH color meter for indicating the acidity of solutions by displaying colored lights.
The electronic pH meter can be of a variety known to those of ordinary skill in the art. A possible example of an electronic pH meter that can be used is Corning pH Bench Meter Model 430, which provides digital measurements and automatic temperature compensation. The meter produces an analog recorder output, which can be converted to a digital signal by the A/D converter. The signal can then be sent to a microcontroller controlling the LED system 1052 which can emit colors corresponding to various pH levels.
Besides the aforementioned pH meter, meters having ion-specific electrodes that produce an analog signal corresponding to the concentration of a particular species in solution can also be used. These meters measure voltages developed between a reference electrode, typically silver-coated with silver chloride immersed in a concentrated solution of potassium chloride, and an indicator electrode. The indicator electrode is separated from an analyte by a membrane through which the analyte ions can diffuse. It is the nature of the membrane that characterizes the type of ion-specific electrode. Electrode types include glass, liquid-ion exchanger, solid state, neutral carrier, coated wire, field effect transistor, gas sensing, or a biomembrane. The reference electrode can communicate with the solution whose concentration one is trying to determine via a porous plug or gel. As described above, an embodiment of an LED system of the present invention can be electrically coupled to such meters to associate a particular ion concentration with the emission of light of various colors.
In another specific embodiment, the light module 100 of the present invention could be used to produce a security system to indicate the presence of an object.
The security clearance network 1063 responsive to the transmitter and receiver 1062 may identify the individual as having the appropriate security clearance for the room at a given time. The badge 1060 itself may include the transmitter and receiver 1062, the electromagnetic radiation detector 1066, coupled to the AID converter, and the LED system 1061 responsive to the security clearance network 1063, so that the badge 1060 changes color depending on whether the individual has clearance to be in proximity to a particular receiver or not. The ID badge 1060 with the LED system 1061 on it may change color in response to a control network depending on whether the person wearing it is “authorized” to be in a certain area, so that others will know if that person is supposed to be there. This could also tell others if the person must be “escorted” around the area or can roam freely. The advantages include time of day based control, zone based control and the concept of moving control zones or rapid zone modification. For example, maintenance staff could be allowed in an area only when another object is not present. For example, in a military aircraft hangar, cleaning might be allowed only when the plane is not there. As another example, security zones in a factory may be used for the purpose of keeping people safe, but when the factory is shut down, much larger areas may be accessible.
In another embodiment, the light module 100 of the present invention can be used to change the lighting conditions of a room.
The light module 100 may be programmed to increase room light as the external light entering the room from the sun diminishes at the end of the day and to compensate for changes in color temperature as well, through a feedback mechanism. In particular, a user may measure the color temperature of particular lighting conditions with the electromagnetic radiation detector 1071, identify the signal from the electromagnetic radiation detector 1071 under desired conditions, connect the microprocessor of the present invention to the electromagnetic radiation detector 1071 and strobe the LED system 1072 of the present invention through various lighting conditions until the signal from the electromagnetic radiation detector 1071 indicates that the desired conditions have been obtained. By periodically strobing the LED system 1072 and checking the signal from the electromagnetic radiation detector 1071, the light module 100 may be programmed to maintain precise lighting conditions in a room.
In another embodiment, room or telephone lights could help identify the source or intent of a telephone call.
By emitting a characteristic color, it would be possible to determine whence a telephone call is being placed. Thus, one could program the light module 100 to cause the LED system 1082 to emit a red light, for example, if the call is being placed from a certain telephone. Alternatively, a caller's wish to designate a call as being urgent could be conveyed to a receiver by a particular color display. Thus, one could program the light module 100 to cause the LED system 1082 to emit a red light, for example, if a caller has designated the call to be an emergency. Still another telephone application involves displaying a range of colors to indicate to the receiver the length of time that a caller has been on hold. For example, the LED system 1082 could emit a green, amber, or red light depending on whether the caller has been on hold for less than one minute, between one and two minutes, and more than two minutes, respectively. This last feature would be especially useful if the telephone has more than one line, and it is important to keep track of various people who have been put on hold.
The foregoing disclosure has dealt with physical conditions that could be indicated by using the LED system of the present invention. Also capable of being indicated in this manner are other such conditions which include acceleration, acoustic, altitude, chemical, density, displacement, distance, capacitance, charge, conduction, current, field strength, frequency, impedance, inductance, power, resistance, voltage, heat, flow, friction, humidity, level, light, spectrum, mass, position, pressure, torque, linear velocity, viscosity, wind direction, and wind speed.
In an embodiment of the invention, the signal-generating device is a remote control of a conventional type used to control electronic devices through radio frequency or infrared signals. The remote control includes a transmitter, control switches or buttons, and a microprocessor and circuit responsive to the controls that causes the transmitter to transmit a predetermined signal. In this embodiment of the invention, the microprocessor or microprocessors that control the LEDs is connected to a receiver via a circuit and is capable of processing and executing instructions from the remote control according to the transmitted signal. The remote control may include additional features, such as illuminated buttons or controls that are formed of LEDs and that change color or intensity in correspondence to the change in the signal sent from the remote control. Thus a lever that is depressed to cause the color of a controlled room light to strobe from red to violet may itself strobe in correspondence to the room light. This effect permits the user to control lights in conditions where the actual LEDs may not be visible, or where interference from other sources makes the true color of the controlled LED difficult to see.
In other embodiments of the invention, the input device for the signals that control the microprocessor may be a light switch for control and mood setting. In particular, the physical mechanism of the light switch, such as a dial, slide bar, lever or toggle, may include one or more LEDs that are responsive to the external signal generated by the switch, so that using the switch to change a microprocessor controlled array of LEDs, such as room lights, causes the switch itself to change colors in a way that matches the changes in the room. The signal could be used to control a multi-color light, monitor, television, or the like. Any control switch, dial, knob or button that changes color in association with the output light that is controlled by the same is within the scope of the present invention.
In another embodiment of the present invention, the input control device may constitute a badge, card or other object associated with an individual that is capable of transmitting a radio frequency, infrared, or other signal to a receiver that controls the microprocessor that controls the arrayed LEDs of the present invention. The badge thus constitutes an interface to the color settings in a room. The badge or card may be programmed to transmit signals that reflect the personal lighting preferences of the individual to the microprocessor, so that room lights or other illumination may be changed, in color or intensity, when the person is in proximity to the receiver for the lights. The desired lighting environment conditions are automatically reproduced via the lighting network in the room. The badge could also include other data associated with the individual, such as music preferences, temperature preferences, security preferences and the like, so that the badge would transmit the data to receivers associated with networked electronic components that are responsive to the signals. Thus, by walking into a room, the individual could cause the lights, music and temperature to be changed automatically by microprocessors controlling arrayed LEDs or other lights, a compact disc player or similar music source, and a thermostat.
In another embodiment of the present invention, the arrayed LEDs may be placed in the floor, ceiling or walls of an elevator, and the LEDs may be made responsive to electrical signals indicating the floor. Thus, the color of the light in the elevator (or of a floor, ceiling or wall lit by the light) may be varied according to the floor of the elevator.
In another embodiment of the present invention, depicted in
Once the signal is encoded, the signal may be transmitted by a data connection 512, which may be a transmitter, circuit, telephone line, cable, videotape, compact disk, DVD, network or other data connection of any type, to the location of the user's entertainment device 514. A decoder 518 may be designed to separate the lighting control data from the entertainment signal. The decoder 518 may be a decoder box similar to that used to decode closed-captioning or other combined signals. Such a decoder may, for example, detect the horizontal sync pulse, count time after the horizontal sync pulse and switch an output channel between a channel for the entertainment device 514 and a different channel dedicated to lighting control data, depending on the time after the horizontal sync pulse. Other techniques for reading or decoding data from a combined signal, such as optical reading of black and white pixels superimposed onto the television screen, are possible. Any system adding and extracting lighting control data to and from an entertainment signal may be used. The entertainment signal may then be relayed to the entertainment device 514, so that the signal may be played in a conventional manner. The lighting control data, once separated from the entertainment signal by the decoder 518, may be relayed to a lighting module or modules 100 for controlled illumination. The signal may be relayed to the light modules 100 by a data connection 522 by any conventional data connection, such as by infrared, radio, or other transmission, or by a circuit, network or data track.
Systems and methods provided herein include an system for combining illumination control with another signal. One such embodiment is an entertainment system, which is disclosed herein. It should be understood that other signals, such as those used for informational, educational, business or other purposes could be combined with illumination control signals in the manner described herein, and are within the scope of the disclosure, notwithstanding the fact that the depicted embodiment is an entertainment system.
The entertainment system may include an illumination source 501, which may be part of a group of such illumination sources 501. The illumination source 501, in this embodiment of the invention, may be a light module 100 such as that disclosed above. Referring to
The entertainment system 561 may include a decoder 518 that is capable of decoding an incoming signal and transmitting the signal by a transmitter 522 to the illumination sources 501. The illumination system may further include a signal generator 504, which is depicted in schematic form in
It should be recognized that any type of entertainment signal could be combined or multiplexed with the control signal to permit control of the illumination sources 501 with the entertainment device 514. For example, the entertainment device could be a television, a computer, a compact disc player, a stereo, a radio, a video cassette player, a DVD player, a CD-ROM drive, a tape player, or other device. It should be understood that the entertainment device 514 could be a device for display for one or more of the above signals for purposes other than entertainment. Thus, educational, informational, or other purposes and devices should be understood to be within the scope disclosed herein, although the embodiment depicted is an entertainment device 514. It should be understood that the particular system for combining the data, transmitting the data, and decoding the data for use by the device 514 and the illumination sources 501 will depend on the particular application. Thus, the transmitter used in the embodiment depicted in
The illumination control driver 509 that generates control data can be any data generator capable of generating data for controlling the illumination sources 501. In an embodiment of the invention, the control driver is similar to that disclosed in connection with
In an embodiment of the invention depicted in
The timing and control circuit 527 may count a predetermined amount of time after the horizontal sync pulse detected by the sync detector 523 and control a series of gates or switches 529, 531, 533 and 535. In particular, the timing and control circuit 527 may be used to open one of the gates 529, 531, 533 and 535 while keeping the other gates closed. Thus, the signal at the node 537 of
In an embodiment the invention may include an analog to digital converter 539, an amplifier 541, or other component or components to convert the signal to appropriate format or to provide an adequate signal strength for use. The end result is an output combined signal 543 that reflects multiple types of data. In an embodiment, the combined signal combines a video signal 511 with illumination control data 515 that is capable of controlling the illumination sources 501 depicted in
Other elements can be included between the timing and control circuit 551 and the respective device; for example, a digital to analog converter 559 could be disposed between the timing and control circuit 551 and the entertainment device 514 to permit use of an analog signal with the entertainment device 514. It should be understood that the timing and control approach depicted in the schematic
The embodiments depicted in
In the television embodiment, different portions of the television signal are used for different purposes. One portion of the signal is used for the visible image that appears on the screen. Another portion is used for audio signals. Another is the overscan area. Another portion is the vertical blanking interval. Another portion is the horizontal blanking interval. Any portion of the signal can be used to carry data. In an embodiment, the data is located in one of the portions, such as the horizontal blanking interval or the vertical blanking interval, that does not interfere with the display on the screen. However, it is known that a typical television does not display all of the display portion of the television signal. Therefore, the initial part of the television display signal could also be replaced with the illumination control data without substantially interfering with the appearance of the picture to the user of the entertainment device 514.
In embodiments, a user may measure the color temperature of particular lighting conditions with a light sensor, identify the signal from the light sensor under desired conditions, connect the processor of the present invention to the light sensor and strobe the arrayed LEDs of the present invention through various lighting conditions until the signal from the light sensor indicates that the desired conditions have been obtained. By periodically strobing the LEDs and checking the signal from the light sensor, the arrayed LEDs of the present invention may thus be programmed to maintain precise lighting conditions in a room. This light compensation feature may be useful in a number of technological fields. For example, a photographer could measure ideal conditions, such as near sunset when warm colors predominate, with a light sensor and reestablish those exact conditions as desired with the arrayed LEDs of the present invention. Similarly, a surgeon in an operating theater could establish ideal lighting conditions for a particular type of surgery and reestablish or maintain those lighting conditions in a controlled manner. Moreover, due to the flexible digital control of the arrayed LEDs of the present invention, any number of desired lighting conditions may be programmed for maintenance or reestablishment. Thus, a photographer may select a range of options, depending on the desired effect, and the surgeon may select different lighting conditions depending on the surgical conditions. For example, different objects appear more or less vividly under different colors of light. If the surgeon is seeking high contrast, then lighting conditions can be preprogrammed to create the greatest contrast among the different elements that must be seen in the surgery. Alternatively, the surgeon, photographer, or other user may strobe the lighting conditions through a wide range until the conditions appear optimal.
The ability to vary lighting conditions, continuously or discretely, at short time intervals and over a wide range of colors, permits a number of technological advances in fields that depend on controlled illumination. Certain embodiments of the invention in the area of controlled illumination are set forth as follows.
The present disclosure further provides systems and methods for precision illumination. Precision illumination is understood to include those systems and methods that direct light at specified targets to achieve predetermined effects. The present invention provides a light source that does not generate excessive heat in the area being illuminated. The invention further provides facile alteration of light color being used for illumination. The invention further delivers illumination to a target material through a durable and manipulable apparatus.
The present invention provides a system for illuminating a material, including an LED system, a processor and a positioning system. The LED system is adapted for generating a range of frequencies within a spectrum, the processor is adapted for controlling the amount of electrical current supplied to the LED system, so that a particular amount of current supplied thereto generates a corresponding frequency within a spectrum, and the positioning system is capable of positioning the LED system in a spatial relationship with the material whereby the LED system illuminates the material. In one embodiment, the processor can be responsive to a signal relating to a feature of the material. In an embodiment, the positioning system can be capable of being directed by a part of an operator's body. In another embodiment, the positioning system can include a remote control system. In another embodiment, the illumination system described herein can include a robotic vision system.
The present invention provides a method for illuminating a material including the steps of providing an LED system, providing a processor, positioning the LED system in a spatial relationship with the material whereby the LED system illuminates the material, and producing light from the LED system. As described above, the LED system is adapted for generating a range of frequencies within a spectrum, and the processor is adapted for controlling the amount of electrical current supplied to the LED system, so that a particular amount of current supplied thereto generates a corresponding color within the spectrum. In one practice, the method can include providing an image capture system, wherein the image capture system is adapted for recording an image of the material. A practice of the method can include the steps of determining the range of frequencies within the spectrum for illuminating the material, and controlling the LED system to generate the corresponding color within the spectrum. The material being illuminated by these methods can include a biological entity. The biological entity can include a living organism. A method of the disclosed invention can include the steps of selecting an illumination condition to be produced in the material, illuminating the material with a range of frequencies produced by the LED system, and selecting from the range of frequencies produced by the LED system a set of colors, whereby the set of colors produces in the material said illumination condition. A practice of the methods of this invention can include a further step of illuminating the material with the selected set of colors.
The present invention provides a method for evaluating a material, including the steps of selecting an area of the material for evaluation, illuminating the area of the material with an LED system, determining at least one characteristic of a light reflected from the area, wherein the characteristic is selected from the group including color and intensity, and comparing the characteristic of the light reflected from the area with a set of known light parameters, whereby the set of known light parameters relates to a feature of said material. According to one practice of the method, the set of known light parameters relates to an abnormal feature of the material. In one embodiment, the material being evaluated comprises a biological entity.
The present invention provides a system for illuminating a body part, including a power source, an LED system connected to the power source, said LED system being adapted for illuminating the body organ, a medical instrument adapted for positioning the LED system in proximity to the body part to illuminate the body part, and a microprocessor for controlling the LED system. In one embodiment, the microprocessor is responsive to a signal relating to a feature of the body part. The feature of the body part can be a structural condition. In one embodiment, the body part is illuminated in vivo. In one embodiment, the body part includes a lumen. In an embodiment, the medical instrument is adapted for insertion within a body cavity.
The present invention provides a method for diagnosing a condition of a body part, including the steps of selecting an area of the body part for evaluation, illuminating the area of the body part with an LED system, determining at least one characteristic of a light reflected from the area, wherein the characteristic is selected from the group including color and intensity, and comparing the characteristic of the light reflected from the area with a set of known light parameters, wherein the set of known light parameters relates to the condition of the body part. In one practice of the method, the set of known light parameters relates to a pathological condition of the body part. The method can include the additional step of administering an agent to a patient, wherein the agent is delivered to the body part, and whereby the agent alters the characteristic of the light reflected from the area of the body part.
The present invention provides a method for effecting a change in a material, including the steps of providing an LED system for generating a range of frequencies within a spectrum, selecting from the range of colors a set of colors, whereby the set of colors produces in the material the change, illuminating the material with the LED system for a period of time predetermined to be effective in producing the change. In one embodiment, the material being illuminated can comprise a biological entity. The biological entity can comprise a living organism. The living organism can be a vertebrate. In one practice, the method can include the step of illuminating the an environment surrounding the living organism.
The present invention provides a method for treating a condition of a patient, including the steps of providing an LED system comprising a plurality of color-emitting semiconductor dies for generating a range of frequencies within a spectrum, selecting from the range of colors a set of colors, whereby the set of colors produces in the patient a therapeutic effect, and illuminating an area of the patient with the set of colors for a period of time predetermined to be effective in producing the therapeutic effect. In one embodiment, the area of the patient comprises an external surface of the patient. In one embodiment, the area of the patient comprises a body part. According to one practice of these methods, an agent can be administered to a patient, wherein the agent is delivered to the area of the patient, and whereby the agent alters the therapeutic effect achieved by illuminating the area of the patient with the set of colors.
The present invention provides an illumination system, including a power terminal, an LED system, a current sink coupled to the LED system, the current sink comprising an input responsive to an activation signal that enables flow of current through the current sink, an addressable controller having an alterable address, the controller coupled to the input and having a timer for generating the activation signal for a predefined portion of a timing cycle, the addressable controller further comprising a data receiver corresponding to the alterable address and indicative of the predefined portion of the timing cycle, and a positioning system capable of positioning the LED system in a spatial relationship with a material whereby the LED system illuminates the material.
Other practices and embodiments of the invention will, in part, be set forth below and will, in part, be obvious to one of ordinary skill in these arts given the following descriptions.
In the embodiments depicted below, LED systems are used to generate a range of colors within a spectrum. “LED system,” as the term is used herein, refers to an array of color-emitting semiconductor dies. Color emitting semiconductor dies are also termed light emitting diodes or LEDs. The array of color-emitting semiconductor dies can include a plurality of color-emitting semiconductor dies grouped together in one structural unit. Alternatively, the array of color-emitting semiconductor dies can comprise a plurality of structural units, each comprising at least one color-emitting semiconductor die. An LED system can further comprise a plurality of structural units, each unit comprising a plurality of color-emitting semiconductor dies. It is understood that as long as at least two primary color LEDs are used, any illumination or display color may be generated simply by preselecting the light intensity that each color LED emits. Further, as described in part in the foregoing specification, each color LED can emit light at any of a large number of different intensities, depending on the duty cycle of PWM square wave, with a full intensity pulse generated by passing maximum current through the LED. The term brightness, as used herein, is understood to refer to the intensity of a light. As an example, described in part above, the maximum intensity of an LED or of the LED system can be conveniently programmed simply by adjusting the ceiling for the maximum allowable current using programming resistances for the processors residing on the light module.
In one embodiment of the present invention, a multicolor illuminating system is provided for illuminating a material. The terms “illumination” and “illuminate” as used herein can refer to direct illumination, indirect illumination or transillumination. Illumination is understood to comprise the full spectrum radiation frequencies, including, visible, ultraviolet, and infrared, as well as others. Illumination can refer to energy that comprises any range of spectral frequencies. Illumination can be viewed or measured directly, whereby the reflected light regarded by the viewer or sensor is reflected at an angle relative to the surface substantially equivalent to the angle of the incident light. Illumination can be viewed or measured indirectly, whereby the reflected light regarded by the viewer or sensor is reflected at an angle relative to the surface that is different than the angle of the incident light. Direct or indirect illumination can be directed at the surface of a material. A surface can be a naturally occurring surface such as a body part or a geological formation. Alternatively, the surface can be a face of an apparatus. A surface can have a three-dimensional topography. A surface can have a plurality of objects affixed to it.
The term “material” as used herein encompasses the full range of materials that can be targets for illumination. The term “transillumination” refers to an illumination method whereby light is directed at least in part through a material, wherein the characteristics of the light are regarded by a viewer or a sensor after the light has passed through the material. As an example of transillumination, illumination from a gastroscope can be directed through the wall of the stomach and through the overlying soft tissues so that a site can be identified for placement of a percutaneous endoscopic gastrostomy tube. As another example of transillumination, a light can be directed at a surface of a tissue mass to determine whether it is cystic or solid. A cystic mass is said to transilluminate, this term referring to the fact that light passes through the mass to be perceptible by an observer at a site remote from the site of the incident light.
A plurality of positioning systems can be envisioned by practitioners in these arts that will conform to the features of the particular material being illuminated. For example, a positioning system adapted for microsurgery can be mounted on an operating microscope and can be controlled by a control module suitable for receiving positioning input from the microsurgeons. As one option for a positioning system to be used in microsurgery or other surgical procedures, a foot pedal system can provide positioning input, either using a foot-operated button, pedal or slide. As an alternative option, a manual control can be adapted for placement in the sterile field by convering the manual control with a sterile plastic bag or sheet so the microsurgeon can manipulate the control manually without compromising sterile technique.
As an example of a positioning system, a standard surgical light fixture can be equipped with an LED system as disclosed herein. The standard surgical light fixture is capable of positioning the LED system in a spatial relationship with the material being illuminated whereby the LED system illuminates the material. This positioning system can be adjusted manually in the standard fashion well-known to surgical practitioners. Alternatively, the positioning system can be controlled in response to signals input from a separate control module. The positioning system can change its position to illuminate materials designated by the operator, either in response to direct input into the control module or as a response to signals transmitted to a sensor apparatus. Other embodiments of positioning systems can be envisioned by those skilled in these arts. The scope of the term “positioning system” is not to be limited by the embodiment illustrated in this figure. A plurality of other positioning systems can be envisioned consistent with the systems and methods described herein.
In the illustrated embodiment, the positioning arm 2032 has a plurality of articulations 2040 permitting its three-dimensional motion. In the illustrated embodiment, the articulations 2040 are arranged to provide the flexibility required by a particular technical application. Positioning can be accomplished with other mechanisms besides those depicted in
The positioning system depicted in
An embodiment of the illumination system can be used for taking photomicrographs. In another embodiment of the present invention, the illumination system 2020 may be used to improve the quality of robotic vision applications. In many robotic vision applications, such as location of semiconductor chips during the manufacturing process, reading of bar code matrices, location of robotic devices during manufacturing, or the like, a robotic camera is required to identify shapes or contrasts and to react accordingly. Different lighting conditions can have a dramatic effect on such vision systems. A method for improving the accuracy of such systems includes creating a color image via a sequence of multiple black and white images taken under multiple different strobed illuminating sequences. For example, the user may strobe a red strobe to get the red frame, a green strobe to get the green frame, and a blue strobe to get the blue frame. The strobing effect permits a higher resolution by the robotic camera of the image required for robotic vision. Other embodiments can be envisioned by those of ordinary skill in the art without departing from the scope of the present invention.
In another embodiment of the present invention, the LEDs are displayed in proximity to the workpiece that requires illumination. Thus, an improved flashlight, light ring, wrist band or glove may include an array of LEDs that permit the user to vary the lighting conditions on the workpiece until the ideal conditions are recognized. This embodiment of the invention may be of particular value in applications in which the user is required to work with the user's hands in close proximity to a surface, such as in surgery, mechanical assembly or repair, particularly where the user cannot fit a large light source or where the workpiece is sensitive to heat that is produced by conventional lights.
In one practice of a method for illuminating a material, a LED system, as described above, can be used. According to this practice, an LED system and a processor are provided. The practice of this method can then involve positioning the LED system in a spatial relationship with the material to be illuminated. The positioning can take place manually or mechanically. The mechanical placement can be driven by input from an operator. Alternately, mechanical placement can be driven by a data set or a set of algorithms provided electronically. A first microprocessor can be provided for controlling the LED system. In an embodiment, a second microprocessor can be provided for positioning the positioning system in relation to the material to be illuminated. In yet another embodiment, a third microprocessor can be provided for processing data input from a sensor system or input from a control panel. Each microprocessor can be related to each other microprocessor, so that changes in one function can be related to changes in other functions.
In one practice, the method can further comprise providing an image capture system for recording an image of the material. An image capture system, as the term is used herein, comprises techniques using film-based methods, techniques using digital methods and techniques using any other methods for image capture. An image capture system further comprises methods that record an image as a set of electronic signals. Such an image can exist, for example, in a computer system. In the current arts, images can be captured on film, on magnetic tape as video or in digital format. Images that are captured using analog technologies can be converted to digital signals and captured in digital format. Images, once captured, can be further manipulated using photomanipulative software, for example Adobe Photoshop™. Photomanipulative software is well-known in the art to permit modification of an image to enhance desirable visual features. An image once captured can be published using a variety of media, including paper, CD-ROM, floppy disc, other disc storage systems, or published on the Internet. The term recording as used herein refers to any image capture, whether permanent or temporary. An image capture system further includes those technologies that record moving images, whether using film-based methods, videotape, digital methods or any other methods for capturing a moving image. An image capture system further includes those technologies that permit capture of a still image from moving images. An image, as the term is used herein, can include more than one image. As one embodiment, a photography system can be provided whereby the material being illuminated is photographed using film-based methods. In this embodiment, the LED system can be strobed to permit stop-action photography of a moving material.
In an alternative embodiment, a sensor system can be arranged to identify the characteristics of light reflected by a material and the LED system can be controlled to reproduce a set of desired light characteristics so that the material will be optimally illuminated to achieve a desired photographic effect. This effect may be an aesthetic one, although industrial and medical effects can be achieved. For example, a set of characteristics for ambient light in the operating room can be identified by surgical personnel and replicated during surgery. Certain types of lighting conditions can be more suitable for certain operations. As another example, photography can be carried out using the LED system to provide certain characteristics for the photographic illumination. As is well-known in the art, certain light tones and hues highlight certain colors for photography. Different light systems used for photography can cause different tones and hues to be recorded by the photograph. For example, incandescent light is known to produce more reddish skin tones, while fluorescent light is known to produce a bluish skin tone. The LED system can be used to provide consistent tones and hues in a photographic subject from one lighting environment to another. Other desired photographic effects can be envisioned by those skilled in the relevant arts.
As one practice of a method for illuminating a material, a predetermined range of colors can be selected within the spectrum. The LED system can then be controlled to generate these colors and to illuminate the material thereby. The material to be illuminated can be an inanimate entity. In one embodiment, a chemical reaction or its component reagents can be illuminated according to this method, whereby the illumination is understood to influence the characteristics of the chemical reaction. In another embodiment, the method of illumination can be directed to a biological entity. The term biological entity as used herein includes any entity related to biology. The term biology refers to the science concerned with the phenomena of life and living organism. Hence, a biological entity can comprise a cell, a tissue, an organ, a body part, a cellular element, a living organism, a biological product, a chemical or an organic material produced by a biological entity or through biotechnology, or any other entity related to biology. Further, though, the term biological entity can refer to a substance that was once part of a living organism, including a substance extracted from a living organism and including a substance that is no longer alive. Pathological specimens are encompassed by the term biological entity. A living organism is called out as a particular embodiment of a biological entity, but this usage is not intended to narrow the scope of the term biological entity as it is used herein. In one practice of a method for illuminating a biological entity, that biological entity can be a living organism. A living organism can include cells, microorganisms, plants, animals or any other living organism.
As a practice of a method for illuminating a material, a predetermined desired illumination condition can be selected, and a material can be illuminated with a range of colors until the desired condition is attained. A range of colors can be selected according to this method, whereby the selected colors are capable of producing the desired condition. Optionally, an additional step of this practice comprises illuminating the material with the selected colors, so as to bring about the desired effect. This method can be applied to non-living or biological entities.
It is understood that a method for illuminating a living organism can have specific effects upon its structure, physiology or psychology. As embodiments of a method for illuminating a living organism, these technologies can be directed towards cells, microorganisms, plants or animals. These practices can comprise, without limitation, microbiological applications, cloning applications, cell culture, agricultural applications, aquaculture, veterinary applications or human applications. As an example, plant growth can be accelerated by precisely controlling the spectrum of light they are grown in.
As a practice of a method for illumination, a material can be evaluated by selecting an area of the material to be evaluated, illuminating that area with an LED system, determining the characteristics of the light reflected from that area and comparing those characteristics of color and/or intensity with a set of known light parameters that relate to a feature of the material being evaluated. The feature being evaluated can be a normal feature or an abnormal feature of the material. As an example, the integrity of a tooth can be evaluated by directing light of a particular color at the tooth to identify those areas that are carious. Structural conditions of materials can be evaluated by illuminating those materials and looking for abnormalities in reflected light. A practice of this method can be applied to biological entities. In forensic pathology, for example, various kinds of fillings for teeth can be distinguished by the way in which they reflect light of particular spectra. This allows identifications to be made based on dental records for forensic purposes. An embodiment of this method related to biological entities is adapted for use in a variety of medical applications, as will be described in more detail hereinafter.
In another embodiment of the present invention, as described in part above, a multicolor illuminator is provided for surgical illumination. Different body organs are typically low in relative color contrast. By changing color conditions in a controlled manner, the surgeon or assistant can increase this relative contrast to maximize the visibility of important surgical features, including internal organs and surgical instruments. Thus, if the surgeon is trying to avoid nerve tissue in a surgery, a light that is designed to create the maximum apparent contrast between nerve tissue color and other tissue will permit the greatest precision. Surgical lights of the present invention can be of any conventional configuration, such as large theater lights, or can be attached to surgical instruments, such as an endoscope, surgical gloves, clothing, or a scalpel.
In the embodiment depicted in
In the illustrated embodiment, the porta hepatis 2112 is an anatomic region that is a body part. The porta hepatis 2112 is understood to bear a plurality of other body parts, including the portal vein 2114, the hepatic artery 2118, the hepatic nerve plexus, the hepatic ducts and the hepatic lymphatic vessels. The hepatic ducts 2120 from the liver 2104 and the cystic duct 2124 from the gallbladder 2110 converge to form the common bile duct 2128; all these ducts are body parts as the term is used herein. Distinguishing these body parts from each other can be difficult in certain surgical situations. In the depicted embodiment, the LED system 2088 is directed at the porta hepatis 2112 during a gallbladder procedure to facilitate identification of the relevant body parts. Directing lights of different colors at the discrete body parts can allow the operator more readily to decide which body part is which, a decision integral to a surgical operation.
A plurality of other applications of these illumination systems can be readily envisioned by those of ordinary skill in the relevant arts. While the embodiment depicted in
Other endoscopic applications will be apparent to those skilled in the art. As illustrative embodiments, an LED system can be combined with endoscopic instrumentation for the evaluation of intraluminal anatomy in gastrointestinal organs, in cardiovascular organs, in tracheobronchial organs or in genitourinary organs. A lumen is understood to be a body part, within the meaning of the latter term. The term lumen is understood to refer to a space in the interior of a hollow tubular structure. The term body part further comprises the wall of a hollow tubular structure surrounding the lumen. Subcutaneous uses of the illumination system can be envisioned to allow identification of body parts during endoscopic musculocutaneous flap elevation. Such body parts identified can include nerves, blood vessels, muscles and other tissues. Other embodiments can be readily envisioned by skilled practitioners without departing from the scope of the systems disclosed herein.
A plurality of arrangements of LEDs can be envisioned by those of ordinary skill in these arts without departing from the scope of the invention. The LED array is capable of being placed in proximity to the target organ by a surgical instrument. The term proximity as used herein refers to the degree of propinquity such that the illumination directed at the target body part is effective in accomplishing the clinical purpose intended by the operator. Thus, the proximity to the target body part is determined by the medical judgment of the operator. Since the LED system does not produce heat, it can be positioned extremely close to the target body parts and other body parts without damaging the tissues. In an embodiment, the illumination assembly is capable of being directed at microsurgical structures without causing heat damage. The intensity of the light available from an LED system is a feature that influences how close the LED system needs to be positioned in order to accomplish the operator's clinical purpose.
As an alternative embodiment, the LED system can be combined with other features on a medical instrument. The term medical instrument as used herein comprises surgical instruments. For example, the LED system can be combined with a cautery apparatus or a smoke aspirator to be used in surgery.
The depicted embodiment permits the surgeon to direct LED light at a particular structure to identify it anatomically as part of cautery dissection. The spectral capacity of the LED system 2144 is useful in identifying blood vessels, for example. Blood vessels embedded in tissues can be especially difficult to identify. The surgeon can dissect with the a cautery tip 2134 of the illustrated embodiment while directing a light from the LED that is selected to highlight vascular structures. The tissues themselves would be distinguishable from the vascular structures based on the response of each set of structures to the light illumination from the LED system 2144. The contrast between tissues requiring dissection and blood vessels to be preserved would be highlighted by the light illumination from the LED system 2144. The surgeon, therefore, would be able to identify what structures are safe to transgress with cautery dissection. In this way, the surgeon could preserve blood vessels more readily, as required by the surgical procedure. Alternatively, the surgeon could identify blood vessels imbedded in tissues and take precautions to coagulate or ligate them effectively before transgressing them. The illustrated embodiment represents only one possible arrangement of combined surgical instrumentation that employs an LED system. Other arrangements can be envisioned by those of ordinary skill in these arts. For specialized surgical applications, specialized combinations can be required. For example, particular instruments are employed in neurosurgery and in microsurgery. The same principles illustrated in the depicted embodiment of
As an alternate embodiment, the LED system can be combined with a sensor system that provides signals that correlate with some characteristic of the body part being illuminated. As an example,
The illumination system described herein is available for both direct illumination and transillumination. Transillumination is understood to refer to the method for examining a tissue, an anatomical structure or a body organ by the passage of light through it. For example, transilluminating a structure can help determine whether it is a cystic or a solid structure. One embodiment of an illumination system can employ LEDs to direct light of differing colors through a structure, whereby the appearance of the structure when subjected to such transillumination can contribute to its identification or diagnosis. Transillumination using LED light can be directed to a plurality of structures. In addition to soft tissues and organs, teeth can be transilluminated to evaluate their integrity. An additional embodiment can employ a LED as an indwelling catheter in a luminal structure such as a duct. Illuminating the structure's interior can assist the surgeon in confirming its position during surgery. For example, in certain surgical circumstances, the position of the ureter is difficult to determine. Transilluminating the ureter using an LED system placed within its lumen can help the surgeon find the ureter during the dissection and avoid traumatizing it. Such an LED system could be placed cystoscopically, for example, as a catheter in a retrograde manner before commencing the open part of the operative procedure. In this embodiment, the LED system is particularly useful: not only can the color of the LED be varied in order to maximize the visibility of the transilluminated structure, but also the LED avoids the tissue-heating problem that accompanies traditional light sources.
Evaluation of a tissue illuminated by an embodiment of the illuminating system described herein can take place through direct inspection. In an alternative embodiment, evaluation can take place through examining the tissues using videocameras. In an illustrative embodiment, the tissues would be visualized on a screen. Color adjustments on the video monitor screen can enhance the particular effect being evaluated by the operating team. As an alternative embodiment, the illuminating system can be combined with a sensor module, as partially described above, whereby the intensity of the reflected light can be measured. As examples, a sensor module could provide for spectroscopic, colorometric or spectrophotometric analysis of the light signals reflected from the illuminated area. Other types of sensor modules can be devised by those skilled in the relevant arts. A sensor module can be combined with direct inspection for evaluating tissues. Alternatively, a sensor module can provide a means for remote evaluation of tissues in areas not available for direct inspection as a substitute for or as an adjunct to video visualization. Examples of such areas are well-known in the surgical arts. Examples of such areas can include transnasal endoscopic access to the pituitary, endoscopic evaluation of the cerebral ventricles, and intraspinal endoscopy, although other areas can be identified by those familiar with the particular anatomic regions and relevant methods of surgical access. In addition to the abovementioned embodiments for use in living tissues, embodiments can be devised to permit evaluation of forensic tissues or pathology specimens using the illuminating systems disclosed herein.
Although the LED system in the illustrated embodiment is affixed to a headband 2160, an alternative embodiment can permit eliminating the headband 2160 entirely and integrating the LED system 2154 in the surgeon's spectacles or magnifying loupes 2164.
The methods of the present invention comprise methods for diagnosing a condition of a body part. The methods for diagnosing a condition of a body part comprise selecting an area of the body part for evaluation, illuminating the area with an LED system, determining characteristics of the light reflected from the body part, and comparing the characteristics with known characteristics, wherein the known characteristics relate to the condition of the body part. These methods can be applied to normal, nonpathological conditions of a body part. Alternatively, these methods can be used to identify pathological conditions of the body part.
It is understood that different body parts reflect light differently, depending upon their anatomic or physiological condition. For example, when subjected to room light, an ischemic body part can be perceived to be a purplish color, a color termed “dusky” or “cyanotic” by practitioners in these arts. Ischemia can therefore be at times diagnosed by direct inspection under room light. However, a multitude of situations exist where the vascular status of a body part cannot be evaluated by inspection under room light. For example, ischemia can be hard to see in muscles or in red organs. Further, skin ischemia is difficult to evaluate in room light in people with dark skins. The methods of the present invention include practices that permit the diagnosis of ischemia to be made by illuminating a body part with an LED system and comparing the reflected light with known light characteristics indicative of ischemia. These methods further can permit this diagnosis to be made at an earlier stage, when room light may not reveal color changes but when LED system illumination can permit the perception of more subtle color changes. A spectrometer or another sort of sensor system can be optionally employed to evaluate the color and/or the intensity of the light reflected from the illuminated body part. For example, the systems and methods of the present invention can be adapted for the diagnosis of early circulatory compromise following vascular procedures. Common vascular procedures which can be complicated by circulatory compromise include surgical vascular reconstructions or revascularizations, surgical replantations, free tissue transfers, embolectomies, percutaneous angioplasties and related endovascular procedures, and medical thrombolytic therapies. The systems and methods disclosed herein can be adapted for the evaluation of tissues within the body by providing an LED system capable of implantation and removal and by providing a sensor system capable of implantation and removal, the former system adapted for directing illumination at a body part within the body and the latter system adapted for receiving color data from the light that is reflected or absorbed by the target body part. Systems and methods adapted for the evaluation of internal body parts can be advantageous in the monitoring of buried free flaps, for example. The lack of heat generated by the LED system makes it feasible to implant it without subjecting the surrounding tissues to heat trauma. Practitioners skilled in the relevant arts can identify other conditions besides ischemia that can be diagnosed using the methods disclosed herein. The full spectrum of light available from the LED systems disclosed herein is particularly advantageous for diagnosis of a plurality of conditions.
As a further example of the methods described herein, the LED system can be used to illuminate the retina for opthalmological examination. Variation in light color can facilitate opthalmological examination, for example the diagnosis of retinal hemorrhage or the evaluation of the retinal vessels. Practitioners of these arts will be able to envision other forms of retinopathy that are suitable for diagnosis using these methods. In one embodiment, an LED system can be integrated in a slit lamp apparatus for opthalmological examination. In an additional embodiment, the LED system can be adapted for use in ophthahnological surgery. As an example, the LED system is capable of assisting in the localization of mature and hypermature cataracts, and is capable of assisting in the surgical extraction of cataracts.
One practice of these methods for diagnosing a condition of a body part can comprise administering an agent to the patient that will be delivered to the body part, whereby the agent alters the characteristic of the light reflected from the body part. An agent is any bioactive substance available for administration into the patient's tissues. An agent can include a drug, a radioisotope, a vitamin, a vital dye, a microorganism, a cell, a protein, a chemical, or any other substance understood to be bioactive. An agent can be administered by any route which will permit the agent to be delivered to the body part being evaluated. Administration can include intravenous injection, intramuscular injection, intraarterial injection, ingestion, inhalation, topical application, intrathecal delivery, intraluminal or intravesical delivery, subcutaneous delivery or any other route. The fall spectrum of light provided by the systems and methods disclosed herein is advantageously employed in conjunction with certain administered agents.
An example of an agent known to alter the characteristic of light reflected from a body part is fluoroscein, a vital dye applied topically for ophthalmic purposes or injected intravenously to evaluate vascular perfusion. When illuminated by a Wood's lamp, fluoroscein glows green. Wood's lamp, though, is not adaptable to many surgical situations because of its physical configuration. Fluoroscein administered to remote body parts cannot be illuminated by a Wood's lamp, nor can the fluorescence be seen in a body part too remote to inspect. Illuminating the tissues with an LED system after the administration of a vital dye such as fluoroscein can produce a characteristic pattern of reflected light. This reflected light can be evaluated by direct visualization, by remote visualization or by a light sensor system. Other agents will be familiar to those of skill in these arts, whereby their administration permits the evaluation of a body part subjected to LED illumination.
As one example, gliomas are understood to have a different uptake of vital dye than other brain tissues. Directing an LED system at a glioma after the administration of vital dye can permit more complete excision of the tumor with preservation of surrounding normal brain tissue. This excision can be performed under the operating microscope, to which can be affixed the LED system for illuminating the brain tissues. The lack of heat generation by the LED system makes it particularly advantageous in this setting. As an additional example, the LED system can be combined with fluoroscein dye applied topically to the surface of the eye for opthalmological evaluation. As yet another example, the LED system combined with fluoroscein can permit diagnosis of ischemia in patients whose skin pigmentation may prevent the evaluation of skin ischemia using traditional methods such as Wood's lamp illumination. As disclosed in part above, these systems and methods can advantageously be directed towards body parts within the human body for evaluation of those body parts after the administration of an agent taken up by the body part.
The methods according to the present invention can be directed towards effecting a change in a material. In a practice of these methods, a change in a material can be effected by providing an LED system, selecting a range of colors from the spectrum that are known to produce the change in the material being illuminated, and illuminating the material with the LED system for a period of time predetermined to be effective in producing that change. The methods disclosed herein are directed to a plurality of materials, both non-biological materials and biological entities. A biological entity can include a living organism. A living organism can include a vertebrate. A living organism can include an invertebrate. A biological entity can be treated with light exposure in order to effect a change in its structure, physiology or psychology. For example, persons afflicted with the depressive syndrome termed seasonal affective disorder are understood to be benefited psychologically by exposure to illumination with light of known characteristics for predetermined periods of time. The illumination can be provided directly to the living organism, for example to the person with seasonal affective disorder. Alternatively, the illumination can be provided to the environment surrounding the person. For example, illumination can be provided by a room light comprising an LED system that can provide light with the predetermined characteristics.
As a practice of these methods, a condition of a patient can be treated. This practice can comprise providing an LED system, selecting a set of colors that produce a therapeutic effect and illuminating an area of the patient with the set of colors. A therapeutic effect is understood to be any effect that improves health or well-being. According to this practice, a pathological condition can be treated. Alternatively, a normal condition can be treated to effect an enhanced state of well-being. The area being illuminated can include the external surface of the patient, to with, the skin or any part of the skin. The external surface of the patient can be illuminated directly or via ambient illumination in the environment. These methods can be likewise applied to internal body parts of a patient.
A variety of agents are familiar to practitioners in the arts relating to phototherapy and photodynamic therapy. Photodynamic therapy (PDT) is understood to comprise certain procedures that include the steps of administering an agent to a patient and illuminating the patient with a light source. Laser light is typically involved in PDT. Since the illumination provided by the LED system can provide full spectrum lighting, including infrared, visible and ultraviolet light spectra, the LED system is available for those therapeutic applications that rely on non-visible light wavelengths. A number of applications of topical illumination have been described in the relevant arts. LED technology has the additional advantage of avoiding heat generation, so prolonged illumination can be accomplished without tissue damage.
Although the practice depicted in
These embodiments described herein are merely illustrative. A variety of embodiments pertaining to precision illumination can be envisioned by ordinary skilled practitioners in these arts without departing from the scope of the present invention.
In other embodiments of the present invention, LEDs are used to create attractive and useful ornamental or aesthetic effects. Such applications include disposition of the LEDs in various environments, such as those disclosed above, including multicolor, LED-based eyeglass rims, an LED-lit screwdriver, a multi color light source for artistic lamps or displays, such as a multicolor LED source for a Lava(lamp, and LED-based ornamental fire or fire log with a simulated fire flicker pattern and coloring, a light-up toothbrush or hairbrush using LEDs or other lighting devices. LEDs may also be disposed on ceiling fan blades for to create unusual lighting patterns for artistic effects or display. In particular, pattern generation may be possible with addition of LEDs to the blades of a fan. Also in accordance with the present invention are an LED-based ornamental simulated candle, a multicolor, LED-based light rope, an LED battery charge indicator and an LED color sensor feedback mechanism, through which an LED may respond to tension, temperature, pressure, cavitation, temperature, or moisture. Thus, an LED disposed near the body can serve as a skin temperature and skin moisture feedback color mechanism. Also provided is an LED-based multicolor hand held wand or indicator light. In particular, wands are provided that are similar to the popular glow sticks, which are widely used in the modem dance/night clubs and for dance expression. Multicolor electronic versions allow color control features as well as remote synchronization via a master lighting controller, provided that the LEDs are connected to a receiver and the master controller includes a transmitter. The LED-based personal devices are reusable, unlike chemically based current devices. The master controller may also control other LED items, such as drink coasters made of LEDs, in a controlled, synchronized manner. Such controllers can be used to control an LED disco ball, in which LEDs are disposed on the exterior or a sphere or other three-dimensional shape and may be controlled to simulate the flashing of a conventional disco ball. For example, effect simulated by the ball include ball strobe, spot movement, color changing, line lighting and plane lighting.
The present invention permits the user to control LEDs at the individual diode level. The effects that may be produced by generating light of a range of colors within the spectrum permit a number of useful applications in a wide range of technological fields. Among other effects, the controlled LEDs can produce color washes that can be instantly varied discretely or continuously over a wide range of colors and intensities, and that can flash or strobe with a wide range of frequencies. Applying a continuous range of color washes results in a number of unusual effects, some of which are aesthetically appealing, functionally valuable, or both. For example, affecting the same object with light of different colors may yield a very different appearance, as is readily apparent when, for example, a white object is shown under a so-called “black light.” An observer viewing the object will perceive a change of color in the object being observed. Thus, a red object illuminated with a red light appears very different from a red object illuminated with a blue light. The former may be a vivid red, whereas the latter may appear purple or black. When objects having color contrast are viewed under colored lights, quite different effects may result. For example, a red and white checkerboard pattern may appear completely red under a red light, while the checkerboard pattern is evident under a white light. By strobing red and white light in an alternating time sequence over such a pattern, the white squares on the checkerboard will seem to appear and disappear. More complex patterns, such as those in multi-color paintings, can result in remarkable effects, such as disappearing and reappearing figures, or figures that undergo dramatic color changes to an observer. The appearance of movement, color change and appearance and disappearance can result in animation-like effects from a single still photograph, painting, design, or image, merely as a result of controlled lighting changes. Similarly, selecting appropriate light conditions can result in dramatic changes in the relative contrast of different-colored items. Items that have little contrast under certain lighting conditions may be perceived to have dramatic contrast under different color conditions. Furthermore, the spectrum of the light produced according to embodiments of the present invention extends to infrared and ultraviolet light, allowing the incorporation of effects such as fluorescence into the display. The lighting changes employed may be pre-programmed, or may be responsive to the environment of the lighting system, such as to the proximity of people, to the ambient lighting conditions, to the location of the display, or to the time of day.
As an example, in
As a second example,
The nature of the lighting system of the present invention permits gradual changes of color from one side of a system to another. Furthermore, the color change can progress gradually along the system, effectively simulating motion of the color change. Additionally, the light can be delivered in a constant manner, or by flashing or strobing the lights. Flashing can also be programmed to occur with simultaneous change of color. These abilities, which can be directed by a microprocessor, can grant additional impetus and vitality to the effects described above.
It will also be apparent that similar effects can be obtained by passing colored light through a transparent or translucent colored screen, such as a stained glass window or a photographic slide, placed between the light source and an observer.
It will also be obvious to the skilled artisan that these effects can be used in more complex displays to create eye-catching illusions of motion and phantom objects that alternately emerge from and fade into the background. Such effects are particularly advantageous when used in applications such as museum exhibits, dioramas, display cases, retail displays, vending machines, display signs, information boards (including traffic information signs, silent radios, scoreboards, price boards, and advertisement boards), advertising displays, and other situations where the attracting the attention of observers is desired. Because the light generated according to embodiments of the present invention can include ultraviolet and infrared light, the objects can incorporate effects such as fluorescence that are particular to illumination with such light.
A vending machine, as contemplated by the present invention, is an apparatus which dispenses products contained therein, such as a soda machine, a snack machine, a gumball machine, a cigarette machine, a condom machine, or a novelty dispenser. Illumination provided according to the present invention can be used to attract the attention of an observer in a variety of ways. For example, a hypothetical olive-dispensing vending machine (3300) using a dove as a logo is depicted in
The vending machine of this and related embodiments may include an LED system (3370) illuminating the vending machine. The LED system may, in embodiments, include a light module 100, a smart light bulb 701, or another embodiment of an LED system, such as those disclosed herein. Accordingly, the LED system may have one or more of the characteristics and provide one or more of the functions of the various other embodiments disclosed elsewhere herein. It should be noted that the light source need not be disposed inside the vending machine, but may be placed outside the vending machine in any position that permits the light source to illuminate the vending machine. Those skilled in the art will recognize many opportunities for designing displays to take advantage of the color-changing attributes of the lighting systems of the present invention.
As another technique available to the olive distributor of the above example, objects or designs may be made to appear and disappear as the color of light is changed. If the olive distributor should name its dove ‘Oliver’, this name might appear in the vending machine (3300) as shown in
Additionally, attention-grabbing effects can be achieved independent of a specific display tailored to take advantage of the color-changing properties of the lighting system of the present invention. The lights may be positioned within or about the display such that the color changes of the lights themselves serve to draw attention to the display. In one embodiment, the lights are positioned behind the display, such as behind a non-opaque backing of a vending machine, so that changing the color of the light is sufficient to attract attention from observers.
The above examples are intended for illustration only, and are not limiting with respect to the scope of the present invention. Those skilled in the art will readily devise other ways of using the lighting systems disclosed herein to achieve a variety of effects which attract the attention of observers, and these effects are encompassed by the present invention.
The present invention permits the user to change the lighting environment by strobing between different colors while taking feedback or spectrum sensor data from the surrounding environment. Such strobes may include a variable-cycle frequency color washing strobing effect using arrayed LEDs. The strobes may thus flash rapidly between colors, or may slowly change throughout the spectrum in a programmed order. The strobing effect can make otherwise unremarkable objects appear quite distinct and aesthetically appealing. Moreover, objects such as paintings may appear to become quite animated when periodically strobed with different colors of light. The attractive illumination effects of the variable frequency strobe permit improved, dynamic lighting environments in areas where lighting is attractive to customers, such as in retail stores, restaurants, museums and the like. The effect may be particularly useful in conjunction with the display of art, such as in art galleries, where known works of art may be radically changed by different lighting conditions. With works of art, for example, the lighting conditions may be controlled to reproduce the light intended by the creator, such as sunlight. Furthermore, the lighting system of the present invention can be used to project infrared and ultraviolet light, in addition to the more common visible wavelengths, and these uncommon frequencies can be used to induce fluorescence and other interesting effects.
In one embodiment of the invention, digitally-controlled, LED-based lights according to the present invention are used to illuminate a non-opaque object for display purposes. In one aspect of the invention, the object is a container containing a fluid, both of which may be substantially transparent. In one aspect, the container is a bottle of gin, vodka, rum, water, soda water, soft drink, or other beverage. An example of such a display is depicted in
The present invention also permits projection of attractive effects or works of art. In particular, in an embodiment of the present invention, a LED-based illumination source is used for projection images or patterns. This system may utilize an LED light source with a series of lenses and/or diffusers, an object containing distinct transparent and opaque areas such as a pattern, stencil, gobo, photographic slide, LCD display, micro-mirror device, or the like, and a final shaping lens. Only the light source, the patterned object, and a surface to receive the projection are necessary for this embodiment. This embodiment, for example, can be used to project a logo or sign onto a ceiling, floor, or wall, or onto a sidewalk outside of a business. In an alternate embodiment, the light may be projected on a cloud, a screen, or a fabric surface. The present invention is particularly advantageous in this regard, because it permits variation of the color of the projection coupled with a light source that does not generate heat.
The color strobe effect of the present invention may be used to create improved display case lighting, such as multicolor display case lighting. The lighting may be provided as part of a modular lighting system or in a standalone control panel. In general, the present lighting system may be used to alter lighting environment, such as work environments, museums, restaurants and the like. In certain applications, special lighting is required, such as in museums, where low UV lighting or heatless lighting may be needed. In other applications, such as cooled display cases, or illuminating edible objects such as food, the heatless light sources of the present invention offer advantages over standard incandescent lighting, which emits significant amounts of heat, while providing light of variable color. Standard fluorescent lighting, which also generates little heat, is often considered to look unappealing. The present invention projects attractive lighting of a controlled, variable spectrum without accompanying heat, while maintaining the flexibility to change the parameters of the generated light.
LED systems of the present invention may be imbedded in articles of clothing to permit light to be projected from the clothing (
The utility of such clothing can be manifested in many ways. An LED display so disposed in the clothing can be used purely for effect, to generate dazzling patterns, visual effects, and the like. The LED displays can represent real-world images, such as the surrounding environment, or may simply reflect surrounding conditions by changing color in response to external data such as temperature, lighting conditions, or pressure. These displays might also be responsive to the proximity of a similar garment, or might receive data from transmitters in the environment. In one embodiment, the display on the clothing is responsive to pressure. Clothing of this embodiment might be worn in a sporting event to provide visual evidence of illegal contact. For example, in the game of baseball, a batter who is struck by the ball would have visible evidence thereof on the portion of clothing so struck. Furthermore, the clothing could include appropriate processors to enable recent data to be repeated on the clothing, effectively creating an ‘instant replay’ of the previous event. Clothing of these and related embodiments may include the sensors required for such responsive requirements.
In yet another embodiment, the display on the clothing could be a medical imaging display. Data from magnetic resonance imaging, for example, could be represented in three dimensions on the surface of clothing worn by the patient as an aid to physicians visualizing the information. Similarly, such clothing could serve as a wearable video screen for any application, such as television, video games, and related displays. The clothing could also be programmed to display a series of predetermined images. For example, pictures might be taken of a person wearing a series of outfits, the person might put on LED display clothing, the picture data might be adjusted for optimal correspondence with the LED clothing, and then the images might be serially displayed on the clothing to simulate instantaneous changes of clothing. Images may also be controlled remotely. Those skilled in the art will envision many related applications of this embodiment.
While the invention has been disclosed in connection with the preferred embodiments shown and described in detail, various modifications and improvements thereon will become readily apparent to those skilled in the art. Accordingly, the spirit and scope of the present invention is to be limited only by the following claims.
1. A method for evaluating a material, comprising:
- selecting an area of the material for evaluation;
- illuminating the area of the material with an LED system;
- determining at least one characteristic of a light reflected from the area, wherein the characteristic is selected from the group including color and intensity; and
- comparing the characteristic of the light reflected from the area with a set of known light parameters, whereby the set of known light parameters relates to a feature of said material.
2. A method according to claim 1, wherein the set of known light parameters relates to an abnormal feature of the material.
3. A method according to claim 1, wherein the material comprises a biological entity.
4. A method for diagnosing a condition of a body part, comprising:
- selecting an area of the body part for evaluation;
- illuminating the area of the body part with an LED system;
- determining at least one characteristic of a light reflected from the area, wherein the characteristic is selected from the group including color and intensity; and
- comparing the characteristic of the light reflected from the area with a set of known light parameters, wherein the set of known light parameters relates to the condition of the body part.
5. A method according to claim 4, wherein the set of known light parameters relates to a pathological condition of the body part.
6. A method according to claim 4, comprising the additional step of administering an agent to a patient,
- wherein the agent is delivered to the body part, and
- whereby the agent alters the characteristic of the light reflected from the area of the body part.
Filed: Dec 10, 2007
Publication Date: Jul 31, 2008
Applicant: Philips Solid-State Lighting Solutions (Burlington, MA)
Inventors: Ihor Lys (Milton, MA), George G. Mueller (Boston, MA), Frederick Marshall Morgan (Canton, MA)
Application Number: 11/953,458
International Classification: A61B 6/00 (20060101);