Multi-colored LED array with improved brightness profile and color uniformity
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United States of America Patent
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Jan 22, 2008
Grant Date -
Jan 6, 2005
app pub date -
May 7, 2004
filing date -
Mar 28, 2003
priority date (Note) -
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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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