Abstract: An LED lighting device can compensate a brightness change and a color change caused by a temperature change and exhibit an in-plane uniform luminance and color. A lighting device includes: at least one line connected in parallel, a constant voltage source for applying a constant voltage to the line, an ON/OFF controller, and a current detector for measuring a value of current flowing in the line. The line is formed by one or more light-emitting diodes and a switch for turning ON/OFF the current flowing in the light emitting diodes connected in series. According to the current value of each of the lines measured by the current detector, the ON/OFF controller controls the ON/OFF period of the switch of each of the lines.

Abstract: A cap lamp features a housing. A control module is positioned within the housing and includes a multi-function switch, a circuit board and contacts adapted to receive power from a battery. An optic module is also positioned within the housing and in engagement with the control module. The optic module includes a light emitting diode (LED) module and an integrated reflector and heat sink as well as an insulator. A bezel is fastened to the housing so as to secure the control module and optic module within the cap lamp housing. A pushbutton is positioned on the housing and is connected to the multi-function switch. A backup LED is in communication with the multi-function switch so that the main LED light or the backup LED may alternatively be selected.

Abstract: A lighting system (300) includes a light source (320) and a switch (310) configured to receive input power (305) and provide switched power A control module (304) is configured to receive the switched power and control the light source (320). The control module (340) is further configured to provide the switched power to the light source (320) in response to toggling the switch (310) more than once within a predetermined time period.

Abstract: The present invention relates to a gaming machine having a light source and one or ideally a series of lighting positions that are illuminated, via optical pathways that are suitably in the form of optical fibres that transmit light from the light source to the or each lighting position. The light source may have a light filter that operably controls the colour and intensity of light illuminating from the lighting positions depending on the outcomes of the game being played. The present invention also relates to a network of the gaming machines and a centralised light source, wherein optical pathways, suitably in the form of optical fibres, transmit light from the light source to the light positions of two or more gaming machines. The network may also include a controller to control illumination of the lighting positions, including colour of the light and intensity of the light based on data received from an outcome determiner of one or more of the machines of the network.

Abstract: A system for increasing awareness and enhancing visibility of a sign that includes a base attached to the sign panel, a plurality of illumination devices coupled to the base, a power source, and a controller coupled to the illumination devices and the power source.

Abstract: Methods and systems to achieve linear and exponential control over a current to drive color LEDs have been achieved. Current digital-to-analog converters (IDAC) comprising each an exponential current digital-to analog converter and a linear IDAC, being cascaded to each other are used for a linear and an exponential control of a current driving a set of color LEDs, preferably RGB LEDs. The linear part of the IDAC, which is converting the mantissa of a floating-point number is used to control the color composition of the color LEDs. The exponential part of the IDAC, which is converting the exponent of the floating-point number is used to control the brightness of the color LEDs. While fading from one color to a next color a linear color change is required. The exponential part of the IDAC is used to dim the LEDs from bright to dark and vice versa. In order to get the visual perception of a linear dimming an exponential current change is required.

Abstract: Described herein are lighting units of a variety of types and configurations, including linear lighting units suitable for lighting large spaces, such as building exteriors and interiors. Also provided herein are methods and systems for powering lighting units, controlling lighting units, authoring displays for lighting units, and addressing control data for lighting units.

Abstract: A fluorescent or light emitting diode-based system for generating light flux. The system comprises a lamp comprising at least one light source for illuminating an area. At least one of the at least one light source is selected from the group comprising at least one of a fluorescent light source or an LED light source. The lamp also comprises a light source controller electrically coupled with the light source and arranged to control the spectral output of the light source. The lamp also comprises a power supply and a switch electrically coupled between the lamp and the power supply and arranged to control the supply of power from the power supply to the lamp.

Abstract: Electron-emissive drive units of electron-emissive elements capable of being arranged with a smaller pitch. FET and emitter array units exist in matrix element areas partitioned by a control wiring and data wiring. An exemplary unit is composed of four emitter arrays. The control wiring and data wiring are driven by first and second drive circuits, respectively. Corresponding arrays between units are connected by selection wiring and driven by a third drive circuit. The third drive circuit drives each unit of data wiring every time the drive circuit sequentially drives the four units of control wiring, and the emitter array drive circuit drives each emitter array selection wiring every time the drive circuit sequentially drives the three units of data wiring. Electrons can be emitted in units of arrays smaller than the unit.

Abstract: An LED driver and a display device using the same are disclosed. The LED driver is adapted for driving a first set of LEDs and a second set of LEDs. The LED driver includes an inductor, a main switch, a first switch, a second switch, and a controller. The inductor has a first terminal receiving an input voltage. The main switch is coupled between a second terminal of the inductor and a common level for adjusting a current flowing therethrough. The first switch is coupled between the first set of LEDs and the second terminal of the inductor. The second switch is coupled between the second LEDs and the second terminal of the inductor. The controller is coupled to controlling terminals of the main switch, the first switch, and the second switch respectively for controlling conducting statuses of the main switch, the first switch, and the second switch respectively.

Abstract: A method for controlling a plurality of light sources. Control signals corresponding to notes of a music file are generated to enable selected ones of a plurality of receptacles to be powered. The plurality of receptacles comprises a first plurality of receptacles and a second plurality of receptacles, and the first plurality of receptacles are powered more frequently than the second plurality of receptacles. The plurality of receptacles is adapted to supply power to the plurality of light sources. A pleasing twinkling effect can be created even if light sources are not coupled to one of the plurality of receptacles.

Abstract: The invention relates to an arrangement for driving at least two light-emitting components connected in a series circuit, wherein the series circuit is coupled to a supply voltage, in each case a switching unit with respective switching terminals is coupled in parallel connection to each of the at least two components and each switching unit has two states.

Abstract: An interconnected arrangement of a light-emitting diode chip arrangement having individual modules as luminous elements in a parallel circuit. Each module is provided with at least one light-emitting diode chip, and the modules are arranged in a parallel circuit. A respective linear constant current circuit connects each light-emitting diode chip arrangement to a common, current-carrying voltage source. At the start of an operation, the voltage source continuously increases the supply voltage over an operating range assigned to it. When a constant total current flowing over the parallel circuit is reached, the current-carrying voltage source fixes the associated supply voltage and maintains it unaltered.

Abstract: A power converter that gives priority to the high power output and only provides power to the low power output when the total potential output power is equal to or less than the rated power of the power converter. A specific power threshold is established, and when the high power output remains below this threshold for a period of time the low power output is allowed to turn on. If the high power output subsequently exceeds this threshold for a period of time, then an electronic circuit powers down the low power output in order to keep the total output power below the rated power of the power converter. Subsequently, the high power output is checked against the threshold to determine if the low power output can be turned on again. If the high power output is below the threshold, then the low power output is turned on.

Abstract: An arrangement (900) and method (1000) for providing power line communication from an AC power source (910) to a circuit (900) for supplying power to a load (960), as well as electronic ballasts (20,30,40,70,80) that operate according to the method (1000).

Abstract: A single drive circuit is configured to drive disparate current loads of first and second combinations of compact light emitting devices with respective regulated constant currents. Standard push ON, push OFF latching switches provide independent control of the two lighting loads wherein each switch operates in three states including momentary ON, continuous ON, and OFF. The circuit is readily adapted to providing continuous or pulsed drive to the lighting arrays. Circuits for dimming control, strobe control, and a low battery indicator are also described.

Abstract: An electro-optic device includes a substrate on which a plurality of electro-optic elements are configured, a plurality of IC chips that drive the electro-optic elements, and a plurality of wiring patterns. Each of the IC chips includes a first power terminal and a second power terminal connected to each other in the IC chip, a third power terminal sandwiching the first power terminal with the second power terminal and placed on a first side opposite to the second power terminal, and a fourth power terminal sandwiching the second power terminal with the first power terminal and placed on a second side opposite to the first power terminal.

Abstract: A light emitting unit which radiates auxiliary light to a subject to be imaged, said light emitting unit comprising: a plurality of light emitting elements disposed so as to have radiation areas different from each other, said light emitting elements being electrically connected in series; and a changing device which changes the number of light emitting elements in a light emitting state in said light emitting elements.

Abstract: A fluorescent lamp driving unit includes fluorescent lamps, wherein each fluorescent lamp includes a first end and a second end opposing the first end; an inverter for driving the plurality of fluorescent lamps to emit light; and a controller for electrically connecting and disconnecting the plurality of fluorescent lamps to and from the inverter.

Abstract: A display panel includes a light guide with a housing that has at least one elliptical shaped surface including a first focal point and a second focal point disposed along a major longitudinal axis. The display panel also has at least one light emitting diode being positioned in proximity to the first focal point and a reflector associated with an inner surface of the housing. The display panel further includes an optical film positioned in proximity to an outlet of the housing. The outlet communicates with the display screen. Light that is emitted from the at least one light emitting diode passes through the first focal point and is reflected to the second focal point. The light from the second focal point is then directed through the optical film so that the light is diffused to the display screen.

Abstract: A LED controller and a control method thereof are disclosed. The LED controller can generate a control signal to drive a LED, measure a luminous intensity value of the LED, and selectively adjust the control signal according to the measured value to dynamically adjust the luminous intensity. Besides, a simple design of driving circuit is applied to achieve an effect of dynamically adjusting the current of the LED.

Abstract: Disclosed is a display controlling apparatus including latch circuits for holding color data of a current line and a previous line, a latch circuit for holding a polarity signal of the previous line, and a recovery control circuit. The recovery control circuit controls a recovery switch from color data of the previous and current lines, a polarity signal and a recovery clock. For both driving method employing frame-based common inverting and the driving method employing line-based common inverting, the display/controlling apparatus recovers electric charge efficiently to provide for low power dissipation.

Abstract: A light facility includes one or more batteries disposed in a housing, a processor device includes two power terminals coupled to the batteries and includes a switch terminal and a key terminal and three light terminals, a light device may be energized by the battery and includes a red light member, a green light member, and a blue light member coupled to the three light terminals of the processor device for being operated to generate red light, green light, and blue light, a switch is selectively coupled to either the switch terminal or the key terminal of the processor device for actuating the light device to generate lights, or gradually darkened light, or gradually brightened light.

Abstract: A method and electronic circuit operate a quartz auxiliary lamp lighting lamp and circuit to light a quartz auxiliary lamp at 120 Vac and 50-60 Hz current connected to an electronic HID ballast operating at a frequency of 100 Hz to over 400 kHz and voltages of from 120 Vac, as provided by a multitap transformer and related circuitry.

Abstract: A secondary light assembly emits light into an area lit by a primary light source. The secondary light assembly includes a light sensor for sensing light emitted from the primary light source. A secondary light source is operatively connected to the light sensor. A controller is electrically connected to the light sensor and the secondary light source. The controller calculates a rate of change of light emission from the primary light source such that the controller turns the secondary light source on when the rate of change of light emission from the primary light source is above a predetermined rate threshold.

Abstract: A system for providing a controllable current to a high intensity discharge lamp is provided. The system includes a current controller that is configured to receive input power and to provide an output current waveform to the high intensity discharge lamp. This current causes a discharge of light from the lamp. The output current waveform includes an absolute value amplitude in each half cycle that is generally constant during a first portion and that which increases non-linearly from the generally constant amplitude to a peak amplitude during a second portion.

Abstract: A power driver circuit for a display panel. The power driver circuit includes a power controller, and a resident power system, which is coupled to an alternating power source and provides resident power for the power controller. When receiving an external on/off signal, the power controller will output driving signals to initiate or close the low-voltage power converter system and the high-voltage power converter system to determine whether a low-voltage power and a high-voltage power are output to drive the display panel. Thereby, when the display panel is in an off state, only the resident power system works. Thus, the power-saving demand of environmental protection is satisfied.

Abstract: Described herein are lighting units of a variety of types and configurations, including linear lighting units suitable for lighting large spaces, such as building exteriors and interiors. Also provided herein are methods and systems for powering lighting units, controlling lighting units, authoring displays for lighting units, and addressing control data for lighting units.

Abstract: A nightlight including a light bank having light-emitting diodes (LEDs) disposed in an array. The amount of light emitted from the light bank can be varied by engaging a switch that selects between a number of electrical pathways. The device includes a photosensitive device such as a light dependent resistor or photo-diode for switching the device on or off under varying ambient light conditions. The photo-diode may be temporarily deactivated in bright ambient light conditions to check and change the settings of the LEDs.

Abstract: A lighting control system is disclosed. The lighting control system is electrically coupled to a load circuit for controlling indoor and/or outdoor lighting. The lighting control system includes a control module with a night light for providing low-level night light illumination and one or more sensors for operatively controlling the indoor and/or outdoor lighting and the night light in response to measured light levels and/or detected motion. The system is preferably configured to provide low-level night light from the night light when measured light levels and detected motion are below threshold values and to automatically turn on the indoor and/or outdoor lighting and simultaneously turn off the night light when measured light levels and detected motion are above the threshold values.

Abstract: Methods and systems to achieve linear and exponential control over a current to drive color LEDs have been achieved. Current digital-to-analog converters (IDAC) comprising each an exponential current digital-to analog converter and a linear IDAC, being cascaded to each other are used for a linear and an exponential control of a current driving a set of color LEDs, preferably RGB LEDs. The linear part of the IDAC, which is converting the mantissa of a floating-point number is used to control the color composition of the color LEDs. The exponential part of the IDAC, which is converting the exponent of the floating-point number is used to control the brightness of the color LEDs. While fading from one color to a next color a linear color change is required. The exponential part of the IDAC is used to dim the LEDs from bright to dark and vice versa. In order to get the visual perception of a linear dimming an exponential current change is required.

Abstract: A discharge lamp lighting device includes a discharge lamp that is lighted through an L-C resonance induced by an oscillation output of an inverter circuit. An on-off operation of switching elements of the inverter circuit is controlled by a control IC which includes a timer circuit for determining a timing of conversion between operation status signals, an inverter control circuit for outputting a driving signal to the switching elements, an output control circuit for controlling generation of the driving signal and an operation status output circuit for outputting a status signal corresponding at least to a lighting status. Further, the discharge lamp lighting device includes an operation setting circuit for inputting a status signal from the operation status output circuit and outputting a control signal to the output control circuit.

Abstract: A method and apparatus are described for a networked lighting system that may be controlled either remotely or locally by a power line communication (PLC) link. The components of the system, addressable lamp ballasts and addressable wall switches, replace their conventional counterparts. The resulting networked lighting system implemented with these components is controlled remotely from a centralized building control center. A particular room may be controlled by the building control center or locally by a wall switch. The invention requires no rewiring of the building's wiring plant, because the addressable components are direct electrical replacements, and installation of the system, therefore, takes a minimum amount of time.

Abstract: A method of forming micro-components is disclosed. The method includes pretesting and conditioning of the micro-components. The micro-components that fail testing or conditioning are discarded, and those remaining are assembled into a panel.

Abstract: A system and method for mitigating the effects of low power line voltage that can otherwise cause premature lamp mortality. A monitor circuit is provided for monitoring power characteristics relating to UV and/or fluorescent lamp operation, such as the lamp supply voltage or the current traversing the lamp. A controller operates in conjunction with the monitor circuit. The controller receives a signal indicative of the state of the monitored power characteristics, and temporarily interrupts the power to the lamp when the signal indicates that the power source is currently failing to maintain a stable current flow through the lamp. Power is therefore removed from the lamp during periods of brownout or other low voltage conditions to prevent accelerated lamp mortality.

Abstract: In one example, a lighting apparatus comprises a processor wherein the processor is configured to control a color-changing lighting effect generated by the lighting apparatus; wherein the processor is further configured to monitor an operating power source; and wherein the processor is further configured to synchronize the color-changing lighting effect in coordination with a parameter of the operating power source.

Abstract: Scanning electrodes are shared between adjacent display lines. Sustaining electrodes are disposed between the scanning electrodes by two. The sustaining electrodes form display lines by gaps with adjacent scanning electrodes. The sustaining electrodes are separated into a first sustaining electrode group in which a plurality of sustaining electrodes disposed at the one side of the scanning electrode are commonly connected and a second sustaining electrode group in which a plurality of sustaining electrodes disposed at the other side of the scanning electrode are commonly connected to be independently driven.

Abstract: A bicycle charge control circuit for receiving electric power from a bicycle dynamo and for controlling the operation of a lamp and a charging circuit includes a lamp switch for selectively providing power from the dynamo to the lamp, a battery charged by the dynamo, and a lamp control circuit operatively coupled to the first lamp switch and to the battery to control the first lamp switch to intermittently supply power to the lamp when the battery voltage is below a selected value.

Abstract: In order to make continuous lamp operation in a failsafe lamp, particularly a lamp for medical applications, having a discharge lamp possible even when changing over between a power supply system (low voltage supply system of, for example, 24 V) and an additional safety power supply (ZSV), a buffer store is discharged in the event of a fault in the power supply for a supply unit for the lamp by changing over to a standby power source, or, once the fault has been eliminated, from the standby power source back to the normal power supply, the buffer store outputting electrical energy to operate the discharge lamp. The electrical energy supplied to the supply unit (EVG) first passes trough a full-wave rectifier and is then supplied to a voltage converter containing the buffer store. The discharge lamp is subsequently supplied with the electrical energy via a power-regulated inverter. Thus, it is ensured that, even for changeover procedures with different current types—e.g.

Abstract: A plasma display panel, one of flat panel display device, having improved electrical connections and the driving method thereof are disclosed. The plasma display panel and the driving method thereof have the advantage of diminishing the number of the high voltage driving ICs of high price by effectively constituting the connections of the discharge electrodes to diminish the number of the driving circuits. In addition, since the total scan electrodes are divided into two blocks, and are driven sequentially and alternately from a block to another, the influence of crosstalks by the leakage of the space charge may be diminished by disposing scan electrodes concurrently impressed with voltage signals to be relatively far apart.

Abstract: A circuit for operating a discharge lamp wherein a variable representing an operating state of the lamp is stored in an operating state storage device. A changeover device switches over between a plurality of operating states of the lamp. The operating state storage device is activated by each relatively short interruption of power to the operating circuit and switches over to an operating state other than that represented by the stored variable. A timer circuit separate from the operating state storage device is coupled to the voltage supply terminal of the operating state storage device and defines a specific time for distinguishing relatively long interruptions of the power supply from relatively short ones.

Abstract: A circuit is described with which an operation circuit for a discharge lamp can be switched between operation states with different lamp currents by hort interruptions of the power supply. Long interruptions than a certain time threshold result in basic state operation.

Abstract: An auxiliary lighting control circuit and method for a lighting system having a HID lamp as the primary light source and an auxiliary light source for providing light when the HID lamp is extinguished or below full brightness but power remains available to the circuit. The circuit senses the HID lamp current and activates a relay to a conductive state using a solid state controller when the HID lamp current is below a predetermined current magnitude to effect the lighting of the auxiliary light source.

Abstract: The present invention relates to an electronic switch system for controlling AC power to a load. The switch has ON, OFF and RAMP down modes that can be selected by means of momentary touch switches. When put into the RAMP down mode, the power to the load decreases slowly at a gradual continuous uninterrupted predetermined rate. This switch system has particular utility in brightness control of lamps. It has been found that the use of a lamp controlled by an electronic switch of the present invention often will induce sleep for people that have difficulty going to sleep, particularly young children and older persons. Thus the electronic switch system and devices embodying this system are particularly useful in a method to induce sleep.

Abstract: A system for providing one-step dimming of indicator lights in an illuminating indicating device while allowing adjustable control of the general illumination of the device. The system includes a first current drain (176) coupled to an indicator light source (32-42) for drawing a first current through the indicator light source. A second current drain (186), controlled by control circuitry (198), couples to the indicator light source (32-42) for selectively drawing additional current through the indicator light source (32-42). In a preferred embodiment, the first current drain (176) couples to the second current drain (186) to regulate the additional current draw by the second current drain (186). Preferably, the control circuitry (198) is responsive to an illumination signal to prevent the additional current draw during a low ambient light condition. For general illumination of the indicator device (10), an illumination light source (56-60) responsive to the illumination signal may also be included.

Abstract: A circuit and method for switching an output terminal from a first voltage level to a second voltage level through a buffered transition includes two voltage sources, a resistor and first switch connected in series and electrically coupled between the first voltage source and the output terminal for providing a suitable resistance for buffering a transition from a first voltage level to a second voltage level. A second switch is electrically coupled between the first voltage and the output terminal. A third switch is electrically coupled between the second voltage source and the output terminal. A programmable logic controller (PLC) controls the three switches in a predetermined sequence to allow switching a voltage source from the first source to the second source through a buffered transition provided by the resistor.

Abstract: A lighting control circuit that controls the lighting of particular lamps in response to the toggling of the power switch. The circuit a) connects only with the high (output) side of a lighting system's ballast, b) is completely contained on the high side, and c) with regard to toggling, is dependent upon only a single time period. The circuit can be used with any ballast which makes use of an output transformer and no change need be made to the original ballast circuitry. Users will find operation of the circuit to be straightforward. A triac driven by a flip-flop via a driver transistor is used to control the high frequency AC power that is used to drive the lamps. A Schmitt trigger sharpens the signal generated by the ballast output transformer in response to the toggling of the light switch which is employed to change the output state of the flip-flop. Operationally, all the lamps driven by the ballast are lit when the power switch is initially turned on.

Abstract: The invention relates to a circuit arrangement for operating electric lam and an operating method for electric lamps. The circuit arrangement has an inverter ((Q1, Q2) with a switch-off device which switches off the inverter (Q1, Q2) in the case of an anomalous operating state. The switch-off device has a field-effect transistor (T1, T1') whose drain-source junction is arranged in the control circuit of an inverter switching transistor (Q2) and switches the control circuit of the inverter transistor (Q2) between a state which is of low resistance in normal operation and a state which is of high resistance in anomalous operation. After the occurrence of an anomalous operating state, it is advantageous to switch off synchronously with the blocking phase of the inverter transistor (Q2) in whose control circuit the field-effect transistor (T1, T1') is arranged.

Abstract: A universal electronic switching device which may be mounted inside various types of lighting fixtures to switch A.C. power to one or more loads, either individually or in groups, within the fixture in a predetermined pattern in response to an interruption of the A.C. line voltage through a serially connected, remotely located, wall switch. Each switching device is capable of switching any A.C. voltage from 120 vac to 350 vac to appropriate lighting loads or equipment such as fluorescent lamp ballasts, incandescent lamps, motorized lighting switches or relays.

Abstract: A multi-color display unit includes at least a first and second plurality of dot-type light sources, such as LED or small lamps, which are arranged in different geometrical patterns and may be powered in any desired order or combination thereof. Each plurality of dot-type light sources may be of different colors or may include color filters in combination with one-color dot-type light sources to form a multi-color display unit. The geometrical arrangement between those dot-type light sources may include bar-type, and/or circumferences, parallel or intersecting, and a combination with other geometrical patterns.