Illumination – Illuminated scale or dial – Internal light source
Patent
1991-11-01
1992-09-01
Lazarus, Ira S.
Illumination
Illuminated scale or dial
Internal light source
362 26, 362 31, 362 62, 340784, 359 49, 359 50, G01D 1128
Patent
active
051434334
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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patent: 5089943 (1992-02-01), Wolfelschneider
Hagarman Sue
Lazarus Ira S.
Litton Systems (Canada) Limited
Rusche Edmund W.
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