Day/night backlight for a liquid crystal display

Details Day/night backlight for a liquid crystal display Day/night backlight for a liquid crystal display

1994-01-05

2000-08-29

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

349 62, 349106, 362 31, G02F 11335, F21V 704

Patent

active

06111622&

ABSTRACT:
A backlit liquid crystal display device having improved nighttime operational characteristics includes a fluorescent lamp for daytime operation and a separate light source for nighttime operation which emits a low-intensity light. Preferably, the nighttime light source is an electroluminescent panel which also acts as a daytime reflector of light. An integral image-splitting and collimating lens is provided to increase the uniformity of the light emitted and to provide wide angle viewability. A sharp cut-off IR filter may also be included in the device to provide NVIS-B night vision goggle compatibility.

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