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Independent control of light emitting diodes for backlighting of color displays

a technology of light-emitting diodes and color displays, applied in static indicating devices, instruments, non-linear optics, etc., can solve the problems of increasing power consumption, increasing the thickness of lcd displays, and difficulty in uniform illumination of the planar array of lcd devices with the array of fluorescent cold cathode tubes

Inactive Publication Date: 2007-01-25
CREE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] Exemplary embodiments of the invention provide edge and/or direct backlighting systems for color display screens that include an array of color picture elements. These backlighting systems include a plurality of clusters of 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. An LED device controller also is provided that is configured to independently control operating parameters of subsets of the clusters of LED devices. In some embodiments, the LED device controller is configured to independently control the operating parame

Problems solved by technology

Unfortunately, an array of fluorescent cold cathode tubes may increase the thickness of the LCD display and / or increase the power consumption thereof.
It also may be difficult to uniformly illuminate the planar array of LCD devices with the array of fluorescent cold cathode tubes.
Unfortunately, this binning may produce additional manufacturing complexity and / or may lead to at least some of the LED devices being rejected as being unsuitable.
Binning and / or rejection of some LED devices also may increase the resultant cost of LED backlighting systems.

Method used

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  • Independent control of light emitting diodes for backlighting of color displays
  • Independent control of light emitting diodes for backlighting of color displays
  • Independent control of light emitting diodes for backlighting of color displays

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Embodiment Construction

[0017] The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. However, this invention should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the thickness of layers and regions are exaggerated for clarity. Like numbers refer to like elements throughout. As used herein the term “and / or” includes any and all combinations of one or more of the associated listed items and may be abbreviated as “ / ”.

[0018] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indica...

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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.

Description

FIELD OF THE INVENTION [0001] This invention relates to displays such as Liquid Crystal Displays (LCDs), and more particularly, to backlighting of displays such as LCDs. BACKGROUND OF THE INVENTION [0002] Display screens are widely used for computer monitors, televisions and many other consumer and commercial display applications. Some flat panel display screens include an array of optical shutters and a backlight system that impinges light on the display screen. [0003] For example, LCD devices are widely used in flat panel displays for monitors, televisions and other consumer and commercial display applications. As is well known to those having skill in the art, an LCD display generally includes an array of LCD devices that act as an array of optical shutters. Transmissive LCD displays employ backlighting using, for example, fluorescent cold cathode tubes above, beside and sometimes behind the array of LCD devices. A diffusion panel behind the LCD devices can be used to redirect an...

Claims

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Application Information

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IPC IPC(8): G02F1/1335H01L33/48H01L33/60H01L33/62
CPCG02F1/133603G09G2320/0233G09G3/3426G09G3/32
Inventor NEGLEY, GERALD H.
Owner CREE INC
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