INDEPENDENT CONTROL OF LIGHT EMITTING DIODES FOR BACKLIGHTING OF COLOR DISPLAYS
First Claim
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1. A backlight system for a flat panel color display screen that includes an array of optical shutter color picture elements, the backlight system comprising:
- a plurality of clusters of Light Emitting Diode (LED) devices of different colors that are configured to radiate light of the different colors in a light path that impinges on the flat panel color display screen to provide backlighting of the array of optical shutter color picture elements on the flat panel color display screen; and
a plurality of LED device controllers, a respective one of which is configured to control operating parameters of a subset of the clusters of LED devices to provide uniform backlighting of the array of optical shutter color picture elements that appears as white light, by compensating for electrical/optical parameter differences among the LED devices, wherein a respective LED device controller is configured to control the operating parameters of a respective single cluster of LED devices; and
wherein a respective cluster of LED devices comprises a red, a blue and a green LED device, wherein the plurality of LED device controllers comprise a plurality of LED device controller integrated circuits, a respective one of which includes a reflective cavity therein and wherein a respective cluster comprising a red, a blue and a green LED device is mounted in the respective reflective cavity in a respective LED device controller integrated circuit.
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Abstract
Backlighting systems for color display screens include clusters of LED devices of different colors that are configured to radiate the different colors in a light path that impinges on the color display screen, to provide backlighting on the color display screen. LED device controllers are provided, a respective one of which is configured to control operating parameters of a subset of the clusters of LED devices, a single cluster of LED devices and/or individual LED devices in the individual clusters. The LED device controllers may use a common data line.
21 Citations
20 Claims
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1. A backlight system for a flat panel color display screen that includes an array of optical shutter color picture elements, the backlight system comprising:
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a plurality of clusters of Light Emitting Diode (LED) devices of different colors that are configured to radiate light of the different colors in a light path that impinges on the flat panel color display screen to provide backlighting of the array of optical shutter color picture elements on the flat panel color display screen; and
a plurality of LED device controllers, a respective one of which is configured to control operating parameters of a subset of the clusters of LED devices to provide uniform backlighting of the array of optical shutter color picture elements that appears as white light, by compensating for electrical/optical parameter differences among the LED devices, wherein a respective LED device controller is configured to control the operating parameters of a respective single cluster of LED devices; and
wherein a respective cluster of LED devices comprises a red, a blue and a green LED device, wherein the plurality of LED device controllers comprise a plurality of LED device controller integrated circuits, a respective one of which includes a reflective cavity therein and wherein a respective cluster comprising a red, a blue and a green LED device is mounted in the respective reflective cavity in a respective LED device controller integrated circuit. - View Dependent Claims (2, 3, 4, 5)
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6. A backlight system for a flat panel color display screen that includes an array of optical shutter color picture elements, the backlight system comprising:
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a plurality of clusters of Light Emitting Diode (LED) devices of different colors that are configured to radiate light of the different colors in a light path that impinges on the flat panel color display screen to provide backlighting of the array of optical shutter color picture elements on the flat panel color display screen; and
a plurality of LED device controllers, a respective one of which is configured to control operating parameters of a subset of the clusters of LED devices to provide uniform backlighting of the array of optical shutter color picture elements that appears as white light, by compensating for electrical/optical parameter differences among the LED devices, wherein a respective LED device controller is configured to control the operating parameters of a respective single cluster of LED devices; and
wherein a respective cluster of LED devices comprises a red, a blue and a green LED device, wherein the plurality of LED device controllers comprise a plurality of LED device controller integrated circuits, wherein a respective cluster comprising a red, a blue and a green LED device and a respective LED device controller integrated circuit are mounted on a common substrate, wherein the common substrate comprises a reflector cavity and wherein the cluster of LED devices is mounted in the reflector cavity. - View Dependent Claims (7, 8, 9, 10)
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11. A backlight system for a color display screen that includes an array of color picture elements, the backlight system comprising:
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a plurality of clusters of Light Emitting Diode (LED) devices of different colors that are configured to radiate light of the different colors in a light path that impinges on the color display screen to provide backlighting on the color display screen; and
a plurality of LED device controller integrated circuits, a respective one of which is configured to control operating parameters of a subset of the clusters of LED devices;
wherein a respective LED device controller integrated circuit includes a reflective cavity therein and wherein a respective subset of the clusters of LED devices is mounted in the respective reflective cavity. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification