Load Device Irradiating The Radiant Energy Responsive Device Patents (Class 315/151)
  • Publication number: 20100045190
    Abstract: An LED backlight controller is disclosed. One embodiment comprises a luminance regulator to generate a luminance control signal to adjust a luminance level in a LED backlight assembly, a timing controller to generate a dimming control signal to adjust a dimming level in the LED backlight assembly, wherein the dimming control signal is a pulse width modulated signal, and an LED driver circuit to receive the luminance control signal and the dimming control signal, the LED driver circuit further to generate an LED driver signal to provide to the LED backlight assembly, wherein the LED driver circuit is configured to control luminance by adjusting the current of the LED driver signal, and wherein the LED driver circuit is configured to adjust a dimming level in the LED backlight assembly by a change in the duty cycle for the dimming control signal. Other embodiments are described herein.
    Type: Application
    Filed: August 20, 2008
    Publication date: February 25, 2010
    Applicant: WHITE ELECTRONIC DESIGNS CORPORATION
    Inventor: Donald L. Cramer
  • Publication number: 20100007279
    Abstract: Methods and systems are provided to increase or optimize the illumination used with a sensor to measure printed ink colors on a substrate at high speed (up to 3 m/s) and high resolution. By modifying the number of light sources, their wavelengths and/or their relative intensities, the optical contrast can be increased or optimized to yield a higher signal-to-noise ratio and improved accuracy for the measurement of multiple colors. In one implementation, multiple LEDs with selected output peak wavelength may be used to achieve higher contrast imaging for each color.
    Type: Application
    Filed: July 10, 2008
    Publication date: January 14, 2010
    Applicant: XEROX CORPORATION
    Inventors: Kenneth Russell Ossman, E. Enrique Viturro
  • Publication number: 20100007600
    Abstract: It is presented a method for controlling a light level of light emitting diodes, LEDs, comprised in a light sensor segment comprising a light sensor and a plurality of LEDs, the method comprising the steps of: turning on all LEDs in an LED segment, comprising at least one of the plurality of LEDs, detecting a light level associated with the LED segment, by detecting a light level using the light sensor, repeating the steps of turning on all LEDs in an LED segment and detecting a light level, until all of the plurality of LEDs are turned on, and for each LED of the plurality of LEDs, controlling a light intensity of the each LED of the plurality of LEDs, the intensity control depending on the detected light level associated with an LED segment containing the each LED of the plurality of LEDs. A corresponding light sensor array, backlight for a display system and liquid crystal display are also presented.
    Type: Application
    Filed: December 10, 2007
    Publication date: January 14, 2010
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Peter Hubertus Franciscus Deurenberg, Henricus Marie Peeters, Marco Van As, Christoph Gerard August Hoelen
  • Publication number: 20090322227
    Abstract: An LED array and a method for controlling such an array is described. The array includes one or more LED-optical sensor pairs in which the optical sensor measures the light output of the associated LED. In some forms of the invention, the optical sensors are provided with filters to attenuate light at a wavelength different to that of the LED associated with that optical sensor. In some forms of the invention, the LED-optical sensor pairs are at least partially shielded from extraneous light. In one form of the invention a plurality of sets of LEDs is provided, each set outputting light having a different frequency and each set being controllable to provide a desired light output.
    Type: Application
    Filed: December 6, 2006
    Publication date: December 31, 2009
    Applicant: ENFIS LIMITED
    Inventors: Gareth Jones, Kenneth Board, Gareth Peter Evans
  • Patent number: 7628507
    Abstract: The LED-radiance source is a suitable replacement of lamp-based integrating sphere sources where they are used as stable and uniform radiance sources. The LED-based radiance source includes an array of LEDs having substantially similar radiance output wavelengths and a radiation detector such as a photodiode that detects and monitors radiation directed from the LEDs. Temperature of the LEDs can be controlled by feedback from a photodiode, thereby allowing for control and stabilization of temperature-dependent radiation output.
    Type: Grant
    Filed: June 3, 2005
    Date of Patent: December 8, 2009
    Assignee: The United States of America as represented by the Secretary of Commerce, The National Institute of Standards and Technology
    Inventors: David W. Allen, Howard Yoon
  • Publication number: 20090243494
    Abstract: A light source device includes: a plurality of light emission units which emit light; a scattering unit which scatters at least a part of light received from the plural light emission units; a light detecting unit which detects a part of light emitted from the plural light emission units and scattered by the scattering unit; and a control unit which controls the plural light emission units based on detection result from the light detecting unit.
    Type: Application
    Filed: February 9, 2009
    Publication date: October 1, 2009
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Shunji KAMIJIMA, Kiyoto SUDO
  • Publication number: 20090230871
    Abstract: Provided are an organic light emitting display device coupled to a photoelectric transistor. The organic light emitting display device includes an anode and a cathode separated from each other, a plurality of organic material layers formed between the anode and the cathode and including an organic light emitting layer, a light source applying an excitation pulse to the organic material layers, and a light receiving unit measuring changes in photoluminescence (PL) signals that are emitted from the organic material layers.
    Type: Application
    Filed: July 11, 2008
    Publication date: September 17, 2009
    Inventors: Mu-Gyeom Kim, Jang-Seok Ma, Sung-Hun Lee, Jung-Bae Song, Sang-Yeol Kim, Dong-Ho Kim
  • Publication number: 20090206759
    Abstract: A controlling system for illumination of a golf course and a controlling method thereof are provided. The illumination controlling system is used for a golf course that has multiple holes. The illumination controlling system has multiple groups of lighting modules respectively corresponding to the multiple holes. Each group of lighting module comprises a plurality of light-emitting devices, a plurality of power devices having control circuit units and chargeable batteries, a plurality of solar panels, and a plurality of motion sensors. Each chargeable battery provides a first working voltage for each light-emitting device. Each control circuit unit connects electrically to utility power to supplies a second working voltage for each light-emitting device. Each motion sensor connects electrically with the control circuit unit of each power device for switching each light-emitting device. The controlling system and method are provided for saving energy of golf course.
    Type: Application
    Filed: September 26, 2008
    Publication date: August 20, 2009
    Inventors: Bily Wang, Min-Chih Hsuan
  • Patent number: 7576309
    Abstract: An illuminating device includes a plurality of light sources, a light guide plate that has plate surfaces on front and rear sides and a plurality of end faces formed around the plate surfaces, receives light emitted from the plurality of light sources through a light incident surface, which is at least one end face among the plurality of end faces, and emits the light through a light-emitting surface, which is one of the plate surfaces, a plurality of photodetectors that are disposed to face the end faces or the plate surfaces of the light guide plate, and a light source control unit that controls light emission of the plurality of light sources on the basis of the output of the plurality of photodetectors. The plurality of photodetectors include at least two photodetectors including light receiving surfaces that face the end faces or the plate surfaces in different directions from each other.
    Type: Grant
    Filed: February 4, 2008
    Date of Patent: August 18, 2009
    Assignee: Epson Imaging Devices Corporation
    Inventor: Hisanori Kawakami
  • Publication number: 20090202236
    Abstract: An illumination controller for controlling an illumination device that irradiates an object to be photographed with illumination light. The illumination controller includes an introducing unit that introduces ambient light emitted to the object from a light source other than the illumination device; a processing unit that processes the ambient light introduced by the introducing unit to have a same characteristic as that of the illumination light; and an irradiation controlling unit that controls the ambient light processed by the processing unit so as to irradiate the object therewith as illumination, from a same path as the irradiation path of the illumination light.
    Type: Application
    Filed: April 27, 2009
    Publication date: August 13, 2009
    Applicants: FUJITSU LIMITED, FUJITSU FRONTECH LIMITED
    Inventors: Soichi Hama, Yutaka Katsumata, Morito Shiohara
  • Publication number: 20090195164
    Abstract: An intelligent light, such as a light for connecting with a low voltage line, is provided. The intelligent light includes a light source for coupling with a low voltage line, and a processor in communication with the light source and the low voltage line. The processor determines a voltage on the low voltage line and operates intermittent switching of the light source as a function of the determined voltage and the intermittent switching used to maintain an output level of the light source.
    Type: Application
    Filed: December 15, 2008
    Publication date: August 6, 2009
    Inventor: Peter D. Joseph
  • Publication number: 20090174331
    Abstract: A circuit to appropriately adjust the emission intensity of LEDs of various colors. By means of a first optical sensor 11, the detection range of which includes the peak wavelengths of LEDs 10R, 10G, and 10B of multiple colors and the detectable peak wavelength of which is shorter than the shortest peak wavelength of the LEDs 10R, 10G, and 10B, and a second optical sensor 12 the detectable peak wavelength of which is longer than the longest peak wavelength of the LEDs 10R, 10G, and 10B, the LEDs 10R, 10G, and 10B of each color are lighted one color at a time and the emission intensity is measured. When the measurement result of the first optical sensor 11 indicates an increase and the measurement result of the second optical sensor indicates a decrease, it is known that the emitted light has shifted to a shorter wavelength, and in the opposite case, that it has shifted to a longer wavelength.
    Type: Application
    Filed: May 9, 2008
    Publication date: July 9, 2009
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Shinichi Tanaka
  • Publication number: 20090167194
    Abstract: The present invention provides a light emission control system including a plurality of light emitting modules each including a plurality of light emitting elements and each being a unit to be controlled, light emitting module controllers each provided for each of the light emitting modules and controlling a corresponding light emitting module, and central controller controlling the light emitting modules. The plurality of light emitting module controllers are divided into a plurality of groups, a plurality of light emitting module controllers belonging to each of the groups are connected in a cascade manner within the group, the plurality of groups are connected in parallel with the central controller, and control information transmitted from the central controller to each of the plurality of groups is sequentially transferred from a light emitting module controller to a following light emitting module controller in each of the groups.
    Type: Application
    Filed: December 22, 2008
    Publication date: July 2, 2009
    Inventor: Minoru MIZUTA
  • Publication number: 20090167193
    Abstract: An image display apparatus which represents a grayscale by pulse-width modulation driving of a display element includes: a light source which illuminates the display element; a light source driving part which drives the light source; a photodetector which detects the emission intensity of light emitted from the light source; a sample-and-holder which obtains the emission intensity of the light source by the photodetector at a predetermined timing in a light emission period of the light source; and a compensation current generating part which (i) obtains the manner in which the emission intensity of the light source changes on the basis of a first sample value obtained at a first timing by the sample-and-holder and of a second sample value obtained at a second timing by the sample-and-holder or a predetermined target value of the emission intensity; and (ii) controls the light source driving part for compensating the emission intensity of the light source on the basis of the obtained manner in which the emissi
    Type: Application
    Filed: November 27, 2007
    Publication date: July 2, 2009
    Applicant: PANASONIC CORPORATION
    Inventors: Masakazu Ogasawara, Takaaki Gyoten
  • Publication number: 20090140656
    Abstract: A light emission device capable of holding a uniform color in various environments. A light source control device has a light detection device for detecting emission brightness of light sources that emit different colors and controlling emission brightness of at least one light source of the light sources based on the detection result of the light detection device. A through-hole is formed in a reflection member for reflecting light emitted from the light source, and the reflection is in a predetermined direction. The light detection device is provided across the reflection member from the light source, and the light propagation member is provided at the through-hole.
    Type: Application
    Filed: February 3, 2006
    Publication date: June 4, 2009
    Inventors: Seiji Kohashikawa, Toshiyuki Fujine
  • Publication number: 20090140972
    Abstract: A light source assembly includes a light source which emits light; a detector which detects the light and generates a light signal based on a property of the light; an operator operably connected to the detector and which receives the light signal and calculates a color coordinate of the light source based on the light signal; a comparator operably connected to the operator and which compares the color coordinate of the light source to a predetermined reference color coordinate; and a control unit operably connected to the comparator and which controls a pulse width modulation signal transmitted to the light source based on a result of the comparison of the comparator.
    Type: Application
    Filed: November 20, 2008
    Publication date: June 4, 2009
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Se-Ki PARK, Gi-Cherl KIM, Sang-Il PARK, Jung-Hyeon KIM
  • Publication number: 20090109665
    Abstract: The invention teaches a new method to provide lighting for photography and other purposes. A consistent, stable, high intensity line-light source is created by using a cylindrical lens and a line-light source using feedback control. The positioning of the line-light source is adjustable to produce parallel, convergence, and divergence beams depending on the desired lighting characteristics. The invention also teaches a new apparatus using the current invention.
    Type: Application
    Filed: October 26, 2007
    Publication date: April 30, 2009
    Inventor: Liansheng Jiang
  • Patent number: 7514662
    Abstract: An illuminating device includes a plurality of light sources, a light guide plate that has plate surfaces on front and rear sides and a plurality of end faces formed around the plate surfaces, receives light emitted from the plurality of light sources through a light incident surface, which is at least one end face among the plurality of end faces, and emits the light through a light-emitting surface, which is one of the plate surfaces, a plurality of photodetectors that are disposed to face the end faces or the plate surfaces of the light guide plate, and a light source control unit that controls light emission of the plurality of light sources on the basis of the output of the plurality of photodetectors. The plurality of photodetectors include at least two photodetectors including light receiving surfaces that face the end faces or the plate surfaces in different directions from each other.
    Type: Grant
    Filed: April 6, 2007
    Date of Patent: April 7, 2009
    Assignee: Epson Imaging Devices Corporation
    Inventor: Hisanori Kawakami
  • Publication number: 20090072748
    Abstract: An exemplary backlight control circuit includes a lamp, a transformer, and a lamp driving circuit. The lamp driving circuit includes a duty ratio determining unit, a duty ratio adjusting unit, and an output unit. The output unit is configured for outputting two pulse signals having a same duty ratio and opposite phases to the transformer. The transformer is configured for generating an alternating voltage for driving the lamp. The duty ratio determining unit is configured for determining if the duty ratio of the pulse signals is in a predetermined duty ratio range. The duty ratio adjusting unit is configured for adjusting the duty ratio of the pulse signals in order to adjust a brightness of the lamp.
    Type: Application
    Filed: September 15, 2008
    Publication date: March 19, 2009
    Inventor: Sha Feng
  • Publication number: 20090066634
    Abstract: In a lighting device for a display device, sensor output determination portions determine whether color sensor output signals are greater than or equal to a predetermined threshold. Variable gain amplifiers amplify the color sensor output signals with a predetermined gain. A color control portion performs color control based on post-amplification signal and obtains luminances of three types of LEDs. Constant current circuits and the PWM circuits drive the three types of LEDs in accordance with control from the color control portion. Gains of the variable gain amplifiers are switched in a stepwise manner so as to become higher as the color sensor output signals become lower. Thus, it is possible to perform color control with high accuracy even when darker light is provided.
    Type: Application
    Filed: December 25, 2006
    Publication date: March 12, 2009
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Hiroaki Isobe, Tetsuya Hamada
  • Publication number: 20090033229
    Abstract: In a high luminance, long-life luminous body, a method for manufacturing the luminous body, and a light-emitting apparatus according to the present invention, an inorganic EL device, which is formed by stacking a back electrode, a dielectric layer, a luminescent layer, a dielectric layer, and a transparent electrode in that order, is used. An activator containing Pr, Mn, and Au is mixed into a base material comprised of strontium sulfide (SrS) and the resulting mixture is heated to activate the base material. Then GaAs and InP are added to the mixture, following which the mixture thus prepared is baked in a nitrogen atmosphere containing sulfur gas to produce the luminous body. By mixing the luminous body thus prepared and an ultraviolet curing dielectric substance, the luminescent layer can be obtained.
    Type: Application
    Filed: January 18, 2006
    Publication date: February 5, 2009
    Inventors: Jiro Kanamori, Yoshisada Hayashi
  • Publication number: 20090009092
    Abstract: Apparatus and a method are disclosed for providing illumination from at least one light emitting diode lighting fixture. Each lighting fixture includes a respective LED array and the method includes the steps of determining at least one parameter associated with the LED array and supplying drive signals to light LEDs in the LED array responsive to the parameter thereby providing illumination having a desired characteristic from said lighting fixture.
    Type: Application
    Filed: September 13, 2005
    Publication date: January 8, 2009
    Applicant: LUMIDRIVES LIMITED
    Inventor: Gordon Routledge
  • Publication number: 20090001893
    Abstract: A system for luminance characterization of a luminaire includes a ballast coil and a multi-tap capacitor connected in series with the ballast coil. The multi-tap capacitor has a plurality of tap capacitors integrated into a capacitor housing. A plurality of switches are each coupled to one of the plurality of tap capacitors for selectively coupling the tap capacitors together to produce a multi-tap capacitance corresponding to a configuration of the plurality of switches. A lamp is connected in series with the multi-tap capacitor and the ballast coil. A photometer is located to measure light intensity of the lamp and to produce a lumen output measurement. A memory is used to store a database having a plurality of lumen output measurements, each corresponding to a multi-tap capacitance corresponding to all configurations of the plurality of switches.
    Type: Application
    Filed: September 2, 2008
    Publication date: January 1, 2009
    Inventors: Donald A. Cleland, Laurence E. Kubek, Carol A. Wong, Gerald E. Kurz
  • Publication number: 20080315773
    Abstract: A LED driving circuit that may control current flow into an LED on a current path according to the amount of light sensed from the LED. An LED driving circuit for driving at least one LED may include at least one of: An optical sensor for receiving light emitted from the LED and generating a feedback signal having a level corresponding to an amount of the received light. A current regulator provided on a path through which current of the LED flows for regulating an amount of current flowing into the LED according to a comparison of the feedback signal with a first reference signal.
    Type: Application
    Filed: June 18, 2008
    Publication date: December 25, 2008
    Inventor: Sung-Man Pang
  • Publication number: 20080290803
    Abstract: The techniques of the present invention relate to automatically controlling display intensity. The present invention includes a calibration step in which the display intensity settings are correlated to the ambient light intensity conditions. The present invention also includes an automatic adjustment step in which the ambient light intensity is measured and the display intensity is automatically adjusted according to a correlation defined in the calibration step.
    Type: Application
    Filed: May 22, 2007
    Publication date: November 27, 2008
    Inventors: Hendrik Santo, Gurjit Thandi, Dilip S., Kien Vi
  • Publication number: 20080272702
    Abstract: The present invention relates to a device for determining characteristics of a lighting unit, comprising at least two flux sensor each having different wavelength characteristics and being arranged to measure light emitted from the lighting unit, yielding two measurements, and means for calculating a dominant wavelength and a real flux for the lighting unit based on the measurements and the sensors' wavelength characteristics. The present invention provides for a direct calculation of dominant wavelength and real flux without the need for predefined data about the light source or without performing additional measurements such as using temperature measurements. The present invention also relates to a system using such a device, and a corresponding method for determining characteristics of a lighting unit.
    Type: Application
    Filed: December 1, 2006
    Publication date: November 6, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Josephus Adrianus Maria Van Erp, Wilhelmus Adrianus Gerardus Timmers
  • Publication number: 20080272701
    Abstract: In a method of driving a light source, light generated by a light source is sensed in order to detect color coordinates of a red color, color coordinates of a green color and color coordinates of a blue color. A light source color space formed by the color coordinates of the red, green and blue colors is compared with a reference color space formed by red reference color coordinates, green reference color coordinates and blue reference color coordinates. Then, color temperature of the light generated by the light source is controlled so that the light source color space covers the reference color space.
    Type: Application
    Filed: March 31, 2008
    Publication date: November 6, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD
    Inventors: Se-Ki PARK, Gi-Cherl KIM, Moon-Hwan CHANG, Eun-Jeong KANG
  • Publication number: 20080203928
    Abstract: A method and a system for controlling at least one lighting arrangement (2), in which the lighting arrangement modulates the light (6, 16, 18) it emits by lighting arrangement data, which contains an identification code identifying the lighting arrangement, a user control device (12) is suitable to receive the light from the lighting arrangement and to derive therefrom the lighting arrangement data, the user control device measures a property of the received light, apart from it representing data, to provide additional data which is associated with the lighting arrangement which is associated with the identification code contained in the received data, the user control device transmits the lighting arrangement data and the additional data, and a main control device (10) is suitable to receive the data transmitted by the user control device and to therewith control the operation of the lighting arrangement.
    Type: Application
    Filed: April 20, 2006
    Publication date: August 28, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Constantinus Carolus Franciscus Frumau, Stefan Marcus Verbrugh, Sander Nijdam, Bennie Simpelaar
  • Publication number: 20080197782
    Abstract: A method and a system for controlling at least one lighting arrangement (2), in which the lighting arrangement modulates the light it emits by lighting arrangement data, which contains an identification code identifying the lighting arrangement, a user control device (12) is suitable to receive the light from the lighting arrangement and to derive therefrom the lighting arrangement data, the user controlled device measures a property of the received light, apart from it representing data, to provide additional data which is associated with the lighting arrangement which is associated with the identification code contained in the received data, data about a location of the user control device is determined, the user controlled device transmits the data it gained, and a main control device (10) is suitable to receive the data transmitted by the user control device and to control the at least one lighting arrangement dependent on all said data.
    Type: Application
    Filed: April 19, 2006
    Publication date: August 21, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventor: Constantinus Carolus Franciscus Frumau
  • Publication number: 20080180032
    Abstract: A flashlight has a body containing control circuitry, with a lamp connected to the body and to the control circuitry. A photodetector is connected to the body and the control circuitry, and faces the lamp to sense an operating condition of the lamp. The control circuitry operates the lamp in a start up mode until signaled by the photodetector that the lamp is properly operating. After this, the lamp is operated in a normal mode. The flashlight may have a switch with a button that moves through a range of positions. The switch may have several contact elements, and the button may have an actuator registered with each of the contact elements. The actuators may be of different heights, to provide a sequence of switch operation. Some of the actuators may be movable to allow the button to be actuated further after an initial contact is made.
    Type: Application
    Filed: January 30, 2007
    Publication date: July 31, 2008
    Inventors: Paul Y. Kim, William A. Hunt, Lai Chang Tang
  • Publication number: 20080164824
    Abstract: A light fixture includes a plurality of fluorescent bulbs wherein a light intensity of each of the plurality of fluorescent bulbs is related to the operating temperature of the fluorescent bulbs, a sensor for sensing a physical parameter related to the light intensity, and a circuit adapted for monitoring the sensor and controlling the operating temperature of the fluorescent bulbs to maintain the operating temperature of the fluorescent bulbs within a range having a lower temperature and an upper temperature. A method of maintaining light intensity of fluorescent bulbs in an environmental chamber includes monitoring a physical parameter associated with the light intensity of the fluorescent bulbs in an environmental chamber and adjusting temperature of the fluorescent bulbs in the environmental chamber to maintain an optimum light intensity of the fluorescent bulbs in the environmental chamber.
    Type: Application
    Filed: January 9, 2007
    Publication date: July 10, 2008
    Inventors: HENRY JAVIER IMBERTI, DANIEL GENE KIEKHAEFER, KURT LEE WILHELM
  • Publication number: 20080136334
    Abstract: A system and method for controlling lighting are described. In general, the system and method may be used for controlling generation of light from the one or more lighting devices within a lighting system, in response to an external input. The control system generally comprises a control interface module and a light generation module. The control interface module is configured to receive the external input and convert same in accordance with a predefined internal control protocol. The light generation module is communicatively linked to the control interface module to receive the converted input and is operatively linked to the one or more light-emitting element modules for controlling generation of light thereby in accordance with the converted input. In one example, the light generation module is either interchangeable or interchangeably adaptable to receive the external input in accordance with one of two or more control protocols.
    Type: Application
    Filed: December 12, 2007
    Publication date: June 12, 2008
    Inventors: Shane P. Robinson, Bojana Bjeljac, Duncan L. B. Smith, Stefan Poli
  • Publication number: 20080129211
    Abstract: An illuminating device and a luminance switching device thereof for controlling luminance of light emitting states of LED light source are provided.
    Type: Application
    Filed: January 12, 2007
    Publication date: June 5, 2008
    Inventors: Rong-Tsung Lin, Yi-Sheng Lin
  • Publication number: 20080100224
    Abstract: A backlight control module includes a gain module, a variable voltage reference, a comparator, and a pulse width modulator. The gain module is coupled to amplify a representation of LED current to produce an amplified current sense signal. The variable voltage reference source is coupled to produce a reference voltage based on the backlight setting to produce a representation of the backlight setting. The comparator is coupled to compare the reference voltage with the amplified current sense signal to produce the comparison signal. The pulse width modulator is coupled to produce a pulse width modulated (PWM) signal as the brightness control signal based on the comparison signal, wherein the brightness control signal is provided to an off-chip variable supply voltage source that provides power to the off-chip LED.
    Type: Application
    Filed: May 1, 2007
    Publication date: May 1, 2008
    Inventors: Matthew D. Felder, Matthew Ross Williamson, Jingyu Hu, Jamie Joseph Happ
  • Publication number: 20080088243
    Abstract: A display apparatus having a displaying part on which an image is displayed, includes: a backlight unit comprising a plurality of light emitting elements that emit different color light which illuminates the displaying part, the plurality of light emitting elements being arranged in a predetermined pattern; a driving part that applies driving current to the backlight unit to control the operation of the light emitting elements and the intensity of light emitted from each of the light emitting elements; a sensing part that senses the amount of light emitted from the backlight unit; and a controller that detects a level of driving current applied to the backlight unit by the driving part, and if the detected level of driving current exceeds a predetermined reference current level, controls the driving part to adjust the backlight unit based on the amount of light sensed by the sensing part.
    Type: Application
    Filed: June 18, 2007
    Publication date: April 17, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD
    Inventors: Hyung-rae KIM, Hoon CHOI, Jun-ho SUNG, Ki-bum SEONG, Jun-ho JUNG
  • Patent number: 7116055
    Abstract: Apparatus and methods are disclosed for measuring cathode fall within a fluorescent lamp that contains an electrode and a gas. A level of cathode fall associated with the electrode may be identified based on an intensity and wavelength of radiation emitted by the gas.
    Type: Grant
    Filed: April 6, 2004
    Date of Patent: October 3, 2006
    Assignee: Lutron Electronics Co., Inc.
    Inventors: John Francis Waymouth, Robert Thomas Nachtrieb, Farheen Khan, Mark Alan Hartfield, Mark Stephen Taipale, Renzo Corrado DeMeo, Russell Lawrence MacAdam
  • Patent number: 7113541
    Abstract: Systems and methods can provide, in one aspect, a method for modulating the pulse width of control signals generated on a plurality of separate channels. In one practice, the methods described herein are suitable for execution on a microprocessor or micro controller platform that includes a timer interrupt mechanism which will generate an interrupt in response to a timer counting down a selected time interval or time period. In one practice, the timer is set to count down a period of time that is representative of a portion, or sub period, of the PWM cycle. Upon expiration of that time period, the timer executes an interrupt that causes the micro controller to enter an interrupt service routine (ISR) that can further modulate the PWM cycle of one or more signals.
    Type: Grant
    Filed: June 25, 1999
    Date of Patent: September 26, 2006
    Assignee: Color Kinetics Incorporated
    Inventors: Ihor A. Lys, Frederick M. Morgan
  • Patent number: 7095309
    Abstract: The invention concerns thermoelastic designs incorporating and expansive element formed from material selected in accordance a procedure involving the derivation of an indicator of the material's potential effectiveness for each application.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: August 22, 2006
    Assignee: Silverbrook Research Pty Ltd
    Inventors: Gregory John McAvoy, Kia Silverbrook
  • Patent number: 7091675
    Abstract: A driving apparatus (2) for cold cathode fluorescent lamps (CCFLs) includes a primary and a secondary driving circuits (22, 21), a primary and a secondary light tubes (24, 23), a primary and a secondary feedback circuits (26, 27), and two photosensitive elements (25) corresponding to the primary and the secondary light tubes, respectively. The primary and the secondary driving circuits provide power to drive the primary and the secondary light tubes, respectively. The primary feedback circuit receives photoelectric current of a corresponding photosensitive element and provides an output signal to the primary driving circuit. The secondary feedback circuit receives currents of both photosensitive elements, and provides an output signal to the secondary driving circuit to keep a brightness of the secondary light tube the same as the brightness of the primary light tube.
    Type: Grant
    Filed: December 31, 2003
    Date of Patent: August 15, 2006
    Assignee: Hon Hai Precision Ind. Co., Ltd.
    Inventor: Jyh Chain Lin
  • Patent number: 7015447
    Abstract: An illuminance calibrating method includes a light-receiving intensity measuring step (ST100) for measuring a relationship between an applied current value and a light-receiving intensity of a CCD camera of which exposure time is capable of being changed by taking an image of an illumination from an illuminator by the CCD camera while changing the exposure time of the CCD camera, a characteristic curve calculating step (ST200) for calculating a characteristic curve of the illumination intensity of the illuminator and the applied current value based on the result obtained in the light-receiving intensity measuring step (ST100), and a command-value/current-value table generating step (ST300) for generating a table of the command value and the applied current value based on the calculated characteristic curve.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: March 21, 2006
    Assignee: Mitutoyo Corporation
    Inventors: Hiroyuki Yoshida, Tatsuya Nagahama
  • Patent number: 6952082
    Abstract: A microwave excited ultraviolet lamp system having a single electrical cable that supplies operating voltages from a power supply to a lamp head. The single electrical cable may provide high voltage to a magnetron of the lamp head and a lesser voltage to an internal blower of the lamp head. The electrical cable may incorporate conductors for transferring communications signals between the power supply and sensors associated with the lamp head.
    Type: Grant
    Filed: January 26, 2004
    Date of Patent: October 4, 2005
    Assignee: Nordson Corporation
    Inventors: James W. Schmitkons, Carl A. Bretmersky, Jay Wolf
  • Patent number: 6841771
    Abstract: A light-receiving circuit of an optical coupling device may include a dummy photodiode arranged in a vicinity of a photodiode. The dummy photodiode and photodiode may convert received optical signals to photoelectric current. Amplified photoelectric current outputs from current-to-voltage converting amplifiers may be compared and subjected to waveform shaping by a hysterisis comparator for improving a common mode rejection ratio. Negative feedback paths and/or circuits of the converting amplifiers may include impedance variable circuits. The impedance variable circuits may reduce impedance based on the level of the input photoelectric current.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: January 11, 2005
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Takayuki Shimizu
  • Publication number: 20040195974
    Abstract: A gas discharge lamp includes a plurality of gas discharge bulbs arranged on a base along a perimeter defining a middle region and at least one reflective mirror positioned in the middle region and operative to reflect light outward from the middle region. Alternatively, at least one light pipe can be positioned in the middle region and configured to gather light and redirect the light outward from the middle region.
    Type: Application
    Filed: April 2, 2004
    Publication date: October 7, 2004
    Inventor: Earl F. Crandall
  • Patent number: 6686706
    Abstract: A device for driving a light-emitting element via three transistors includes a driving circuit, a negative voltage circuit, and a protection circuit. The driving circuit has a first transistor and a second transistor for producing a first signal. The negative voltage circuit electrically connected to the driving circuit for transforming the first signal into a second signal to be transmitted to the light-emitting element, and the light-emitting element is driven in response to an operating voltage resulted from the voltage of the second signal and a power voltage. The protection circuit includes a third transistor having two terminals connected to the light-emitting element and the third terminal connected to a base of an NPN transistor for controlling the operating voltage so as to stabilize an output of the light-emitting element.
    Type: Grant
    Filed: November 14, 2002
    Date of Patent: February 3, 2004
    Assignee: Precision Instrument Development Center National Science Council
    Inventor: Tai-Shan Liao
  • Patent number: 6624585
    Abstract: An igniter circuit for an arc discharge lamp comprises a DC to AC converter, a transformer, an AC to DC converter and high-voltage DC energy storage which is capable of discharging electrical energy to ignite the arc discharge lamp. In an embodiment, the igniter circuit is capable of producing arc discharge by using a low-voltage DC power supply and is suitable for implementation in a lightweight compact portable projector.
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: September 23, 2003
    Assignee: InFocus Corporation
    Inventor: Henry Frazier Pruett
  • Patent number: 6617795
    Abstract: A multichip light-emitting-diode package having a support member, at least two light-emitting-diode chips disposed on the support member, at least one sensor disposed on the support member for reporting quantitative and spectral information to a controller, relating to the light output of the light-emitting-diodes, and a signal processing circuit, including an analog-to-digital converter logic circuit, disposed on the support member for converting the analog signal output produced by the sensors to a digital signal output.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: September 9, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Gert W. Bruning
  • Patent number: 6535829
    Abstract: The present invention provides a system, comprising an exposure apparatus and a control mean electrically connected to the exposure apparatus, for calculating exposure energy (Ee). The control mean executes an exposure energy calculation program according to mask data, comprising an actual transparency percentage parameter (Ta) and a mask error, and a critical dimension (CD) specification, comprising at least a basic transparency percentage parameter (Tb), a transparency constant (Tc), a CD energy constant (Cc) and a basic exposure energy, to calculate the exposure energy and output the exposure energy to the exposure apparatus. In the exposure energy calculation program, the basic transparency percentage parameter (Tb) is firstly subtracted from the actual transparency percentage parameter (Ta). The resulting difference is then multiplied together with the transparency constant (Tc) parameter to calculate a transparency percentage difference energy.
    Type: Grant
    Filed: June 12, 2001
    Date of Patent: March 18, 2003
    Assignee: United Microelectronics Corp.
    Inventors: Wen-Chih Lee, Yu-Ming Chuang
  • Patent number: 6510168
    Abstract: A drive current Ip used to control the light output from a laser diode LD is controlled by using an output Vsft from a level shift circuit 3. By inserting the level shift circuit 3 between a drive source (V+) and a switch buffer 5, the lower limit (V+)−(V−) of the drive voltage in the circuit is lowered to enable the laser diode drive circuit to be driven at a lower voltage and to achieve a reduction in power consumption.
    Type: Grant
    Filed: September 27, 2000
    Date of Patent: January 21, 2003
    Assignee: Oki Electric Industry Co, Ltd.
    Inventor: Osamu Kikuchi
  • Patent number: 6452340
    Abstract: A starting aid for a luminaires includes a trigger circuit for supplying a trigger voltage pulse to a lamp in response to the presence of a line voltage signal supplied by a photodetector, a feedback circuit for detecting the lamp voltage and means, responsive to the line voltage signal and the feedback circuit, for comparing the voltage on the lamp to a nominal voltage level for disabling the trigger circuit and terminating the trigger voltage pulse in the presence of a lamp cycling or lamp out condition.
    Type: Grant
    Filed: April 6, 2000
    Date of Patent: September 17, 2002
    Assignee: Acuity Brands, Inc.
    Inventors: Joseph F. Morrissey, Jr., Jeff Walters
  • Patent number: 6407512
    Abstract: Flash light is repeatedly emitted in a pulse state by intermittently turning on and off an IGBT. The flash light reflected by a subject is received by a phototransistor to integrate a received light amount with a capacitor. While the IGBT is turned off, a charging voltage of the capacitor is converted to digital data. Based on the obtained data, it is judged whether emitting the flash light is stopped or not.
    Type: Grant
    Filed: November 14, 2000
    Date of Patent: June 18, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yutaka Yoshida, Takaaki Kotani, Katsumi Motomura, Wataru Sasaki, Yoshiaki Yamamoto, Hiroyuki Uchiyama