Multi-colored LED array with improved brightness profile and...

Details Multi-colored LED array with improved brightness profile and... Multi-colored LED array with improved brightness profile and...

2004-05-07

2008-01-22

O'Shea, Sandra (Department: 2875)

Illumination

Plural light sources

Particular wavelength

C362S244000, C362S308000, C362S335000, C362S259000

Reexamination Certificate

active

07320531

ABSTRACT:
A backlight uses an array of red, green, and blue LEDs in a mixing chamber. The mixing chamber has reflecting surfaces and a top opening for illuminating LCD layers. A desired brightness profile and better color uniformity are obtained by using techniques including arranging the LEDs in certain sequences and patterns, providing a specular ring at the base of each LED, attenuating the brightness of the LEDs at the edges, and using widely separated diffusers in the mixing chamber. The arrangement, selection, and control of the multicolored LEDs may be tailored to achieve any desired white point specified by the display manufacturer.

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Robert Scott West, “43.4: High Brightness Direct LED Backlight for LCD-TV,” SID 03 Digest, 4 pages, no date.

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