Night vision backlighting system for liquid crystal displays
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United States of America Patent
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Sep 1, 1992
Grant Date -
N/A
app pub date -
Nov 1, 1991
filing date -
Nov 1, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention presents a way to provide night vision viewing compatibility of backlit electrooptic modulated light valve or LCD displays designed for daylight viewing. Liquid crystal displays (LCD) designed with backlighting systems which provide a high brightness, good contrast display under daylight conditions are inappropriate for use in dark, night time conditions where viewing of the display is desired utilizing electronic night vision equipment. This invention describes improvements to standard backlighting displays which through the utilization of arrays of low-level intensity light sources such as secondary fluorescent light sources, miniature incandescent lamps or light emitting diodes, the general means used in daylight vision can be turned off and the secondary low-level lighting sources achieve a minimum intensity acceptable for night vision electronic viewing.
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