Ambient light illuminated liquid crystal display system

Details Ambient light illuminated liquid crystal display system Ambient light illuminated liquid crystal display system

1989-06-12

1991-03-05

Moskowitz, Nelson

350338, G02F 113

Patent

active

049972634

ABSTRACT:
A liquid crystal display system utilizes an optical arrangement which is aligned so that ambient light from the direction of an obersver's view is channeled behind the liquid crystal display to provide back illumination therefor. An illuminator is arranged to provide supplementary illumination for the liquid crystal display as may be required. A photodetector determines when ambient light is inadequate for required display brightness and operates through appropriate control circuitry to turn the illuminator on or off as the case may be and to control the contrast of the liquid crystal display.

REFERENCES:
patent: 3712047 (1973-01-01), Girard
patent: 3838909 (1974-10-01), Fitzgibbons
patent: 3966303 (1976-06-01), Yamamoto
patent: 4124279 (1978-11-01), Byles
patent: 4310871 (1982-01-01), Adachi
patent: 4367923 (1983-01-01), Ishikawa
patent: 4621898 (1986-11-01), Cohen
patent: 4723840 (1988-02-01), Humbert et al.

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