Chroma compensated backlit display

Details Chroma compensated backlit display Chroma compensated backlit display

2004-05-24

2008-03-04

Vu, David H. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S308000

Reexamination Certificate

active

07339332

ABSTRACT:
Methods and apparatus are provided for a backlit display with variable luminance and chrominance. The apparatus comprises i groups of LEDs of different colors and one or more sensors optically coupled to the LEDs. The combined light produced by the LEDs is directed to a transmissive liquid crystal display, preferably through a diffusing layer. The sensors monitor the output Siof each group of LEDs. Sifor each group of LEDs is multiplied by a chrominance determining parameter Kito obtain Ki*Siwhich is then compared to a commanded luminance signal LCto obtain LC−Ki*Si, which difference is used to adjust the drive current to each group of LEDs to achieve LCwith the desired chrominance set by Ki. By changing Kiand LCthe chrominance and luminescence of the display may be varied and aging effects compensated.

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