Wide dimming range backlight for liquid crystal devices

Details Wide dimming range backlight for liquid crystal devices Wide dimming range backlight for liquid crystal devices

1994-05-18

1995-08-15

Lazarus, Ira S.

Illumination

Illuminated scale or dial

Edge illuminated modifier or light rod/pipe

362 31, 362 62, F21V 904, F21V 722

Patent

active

054425220

ABSTRACT:
A backlight system for liquid crystal device display is equipped with a dual lighting system for day viewing and night viewing. The day lighting system uses conventional fluorescent or incandescent lamps for full color display during daytime use. The night lighting system uses a lower intensity light source. The day lighting system is disabled while the night system is in use. The dual lighting system provides an extended dimming range compared to what would otherwise be available.

REFERENCES:
patent: 4277827 (1981-07-01), Hehr
patent: 4934793 (1990-06-01), Klein
patent: 5143433 (1992-07-01), Farrell
patent: 5211463 (1993-05-01), Kalmarash

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