Contrast control for a backlit LCD

Details Contrast control for a backlit LCD Contrast control for a backlit LCD

1997-10-06

1998-10-06

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

349 69, 345102, G02F 11335, G09G 336

Patent

active

058185534

ABSTRACT:
A contrast controller for a liquid-crystal display maximizes the display contrast by using a light sensor to detect ambient light levels and light blocked by the LCD panel. The display contrast is maximized by maximizing the difference between the ambient and blocked light levels. Further contrast maximization is accomplished through variable control of the LCD backlight in accordance with sensed light levels.

REFERENCES:
patent: 4888599 (1989-12-01), Harwood et al.
patent: 4920257 (1990-04-01), Fuerthbauer et al.
patent: 5302815 (1994-04-01), Eggenschwiler
patent: 5327263 (1994-07-01), Katagiri et al.
Author--Unknown; Title--"A better option for processing light levels"; Date--Spring, 1994 p.-5; Place of Publication--Texas Instruments.

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