Subramanian Muthu, Chin Chang, Gert Bruning: White LED luminary light control system. Koninklijke Philips Electronics, August 27, 2002: US06441558 (435 worldwide citation)

An LED luminary system for providing power to LED light sources to generate a desired light color comprises a power supply stage configured to provide a DC current signal. A light mixing circuit is coupled to said power supply stage and includes a plurality of LED light sources with red, green and b ...

Subramanian Muthu, Chin Chang: LED luminaire with electrically adjusted color balance using photodetector. Koninklijke Philips Electronics, Aaron Waxler, December 17, 2002: US06495964 (343 worldwide citation)

The combined light output (chromaticity) of a white light emitting LED luminaire is electronically controlled based on measurements by a single photodiode arranged to measure the light outputs of at least a plurality of the LEDs in the array. This is accomplished by measuring the light output of the ...

Jawji Chen, Shuen Chin Chang, Yong E Park, Cindy Yuklin Ng, Chiayao S Tung, Jeongsik Yang: System for I/O interfacing for semiconductor chip utilizing addition of reference element to each data element in first data stream and interpret to recover data elements of second data stream. Integrated Memory Logic, Philip W Woo, Skjerven Morrill, November 5, 2002: US06477592 (213 worldwide citation)

An I/O interface circuit includes an output buffer circuit and an input buffer circuit. The output buffer circuit can receive a first stream of data elements for output from the semiconductor chip, add a separate reference element for each data element in the first stream, and generate a first data ...

Chin Chang, Subramanian Muthu, Gert W Bruning: White light-emitting-diode lamp driver based on multiple output converter with output current mode control. Philips Electronics North America, April 9, 2002: US06369525 (171 worldwide citation)

A white light-emitting-diode array driver circuit with a multiple output flyback (or forward) converter with output current mode control. The circuit comprises a power supply source and a transformer. The transformer has a primary winding coupled to, and configured to receive current from, the power ...

Subramanian Muthu, Frank J Schuurmans, Chin Chang, James Gaines: LED-based white-light backlighting for electronic displays. Koninklijke Philips Electronics, June 22, 2004: US06753661 (170 worldwide citation)

Apparatus and method for backlighting an electronic display with LEDs to control luminosity, radiometric power, and color levels by means of feedback control through a microprocessor, thereby maintaining white backlight at substantially constant levels, which can be chosen by an operator.

Subramanian Muthu, Chin Chang: RGB LED based light driver using microprocessor controlled AC distributed power system. Koninklijke Philips Electronics, January 28, 2003: US06510995 (164 worldwide citation)

A device for controlling and adjusting a display light for a retail display system comprising a computer associated with plural light sources for adjusting the light sources to optimally display particular products. The light sources are adjusted based upon a prestored table specifying optimal light ...

Chin Chang: Adaptive control system and method with spatial uniform color metric for RGB LED based white light illumination. Koninklijke Philips Electronics, April 22, 2003: US06552495 (158 worldwide citation)

The present invention is directed to a control system for generating a desired light color by a plurality of Red, Green and Blue light emitting diodes (LEDs) comprised of a sensor responsive to a light color generated by the plurality of LEDs to measure the color coordinates of the generated light w ...

Chin Chang, Gert W Bruning: Autonomous solid state lighting system. Koninklijke Philips Electronics, July 27, 2004: US06768047 (155 worldwide citation)

An autonomous solid state lighting system has a charge mode which collects energy and produces electric power with a solid state energy source, converts the voltage of the electric power using a bi-directional power converter, and stores the power in an energy storage device. A discharge mode draws ...

Chin Chang: Integrated LED driving device with current sharing for multiple LED strings. Koninklijke Philips Electronics, September 16, 2003: US06621235 (147 worldwide citation)

An integrated LED driving device for multiple LED strings which employs a single linear regulator or other controller and a multiple-output current mirror which is almost independent of the DC input voltage source, almost independent of the transistor's or MOSFET's variations from the semi ...

Chih Chin Chang, Kuang Chao Yeh: Stacked capacitor having parallel interdigitized structure for use in thin film transistor liquid crystal display. AU Optronics, Winston Hsu, September 26, 2006: US07112820 (123 worldwide citation)

A capacitor structure includes a first conductive layer, a first insulating layer disposed on a substrate in sequence, a second conductive layer disposed on portions of the first insulating layer, a second insulating layer disposed on the second conductive layer and the first insulating layer, a thi ...