Koninklijke Philips Corporation N.v.

U.S. Philips Corporation

North American Philips Corporation

Philips Electronics North America Corporation

James M Gaines

John Petruzzello

Bernd Clauberg

Subramanian Muthu

Josephus A M Van Erp

Chin Chang

Michael D Pashley

Kevin W Haberern

Piotr M Mensz

Timothy B Moss

Michel Zwanenburg

Ronald R Drenten

Frank J Schuurmans

Thomas M Marshall

Eric J Kille

Mubasher Ahmad

Schuurmans Frank J P

Michel J Zwanenburg

An LED lamp power management system and method including an LED lamp having an LED controller; a plurality of LED channelsoperably connected to the LED controller, each of the plurality of LED channelshaving a channel switchin series with at least one shunted LED circuit, the shunted LED circuithaving a shunt switchin parallel with an LED source. The LED controllerreduces power loss in one of the channel switchand the shunt switchwhen LED lamp electronics power loss (P) exceeds an LED lamp electronics power loss limit (P); and each of the channel switchesreceives a channel switch control signalfrom the LED controllerand each of the shunt switchesreceives a shunt switch control signalfrom the LED controller

LED lamp power management system and method

An LED lamp color control system and method including an LED lamp having an LED controller; and a plurality of LED channelsoperably connected to the LED controller, each of the plurality of LED channelshaving a channel switchin series with at least one shunted LED circuit, the shunted LED circuithaving a shunt switchin parallel with an LED source. The LED controllerdetermines whether the LED sourceis in a feedback controllable range, stores measured optical flux for the LED sourcewhen the LED sourceis in the feedback controllable range, and bypasses storing the measured optical flux when the LED sourceis not in the feedback controllable range.

LED lamp color control system and method

A lighting fixture (-) mechanically encloses a LED module (), which includes at least one LED () and can further include a LED driver () in electrical communication with the LED(s) () to operably provide a LED drive signal to the at least one LED (), a thermal management system () in thermal communication with the LED(s) () and the lighting fixture (-) to facilitate a heat transfer from the LED(s) () to the lighting fixture (-), and/or a beam shaper () in optical communication with the LED(s) () to modify an illumination profile of a radiation beam emitted by the LED(s) ().

LED lighting fixtures

An apparatus is directed to controlling a light source. The apparatus provides at least one light source that emits a light signal at a discrete frequency and a reference signal at the discrete frequency. The apparatus further includes a photodetector optically coupled to the light source and designed to receive the light signal. The apparatus additionally includes at least one lock-in system coupled to the photodetector and each light source that receives the light signal from the photodetector and receives the reference signal from the light source. Each lock-in system produces an intensity value of the light source based on the light signal and the reference signal. The lock-in system may include a frequency multiplier and a filter coupled to the frequency multiplier wherein the intensity value is the product of the light signal and the reference signal processed through the frequency multiplier, and filtered to remove non-dc portions.

Sensing light emitted from multiple light sources

The present invention provides a method, system and structure for maintaining light characteristics from a multi-chip LED package. This may be done by selecting a desired light output and restricting light from a plurality of light emitting diodes in the multi-chip LED package. It may also be done by measuring the restricted light, comparing the measured output light to the desired light and by adjusting current to LEDs in the multi-chip LED package based on the measured light.

Method for maintaining light characteristics from a multi-chip LED package

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.

LED-based white-light backlighting for electronic displays

A white light is provided for backlighting a liquid crystal display by directing red green and blue light into the first end of a color mixing optical fiber, mixing the red green and blue light in the color mixing fiber to produce white light, and conducting the white light out of the second end of the color mixing fiber to the liquid crystal display. The color mixing optical fiber and sources for generating the red green and blue light may be located remotely from the liquid crystal display, and the white light produced in the color mixing optical fiber coupled to the liquid crystal display by coupling optical fibers, thus simplifying and facilitating construction and operation of the backlighting system, and allowing for more convenient removal of heat remotely from the liquid crystal display.

White light source for LCD backlight

Epitaxial layers of II-VI semiconductor compounds having low incidence of lattice defects such as stacking faults are produced by first depositing a fraction of a monolayer of the cation species of the compound, followed by depositing a thin layer of the compound by migration enhanced epitaxy (MEE). Growth of the remainder of the layer by MBE results in much lower defects than if the entire layer had been grown by MBE. Layers are useful in devices such as LEDs and injection lasers.

Method for producing II-VI compound semiconductor epitaxial layers

II-VI compound semiconductor epitaxial layers having low defects, method

A blue-green II/VI semiconductor injection laser utilizing a Zn.sub.1-u Cd.sub.u Se active layer (quantum well) having Zn.sub.1-x Mg.sub.x S.sub.y Se.sub.1-y cladding layers and ZnS.sub.z Se.sub.1-z guiding layers on a GaAs substrate. These devices are operable in a pulse mode at room temperature.

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Mohegan Lake, NY, United States of America

James M Gaines