Optically enhance day/night liquid crystal display backlight wit

Details Optically enhance day/night liquid crystal display backlight wit Optically enhance day/night liquid crystal display backlight wit

1997-07-23

1999-11-16

Parker, Kenneth

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

349 65, 349 64, 362 31, G02F 11335

Patent

active

059867280

ABSTRACT:
Light emitting devices are combined with non-imaging optical elements to create a backlighting system for liquid-crystal displays (LCDs). A pair of optically isolated sub-systems, or sections a night vision imaging system (NVIS) (14) and a daylight system (12) are combined to provide optimum display legibility in ambient illuminations ranging from bright sunlight to total darkness. The sub-systems utilize non-imaging optics based upon total internal reflection (TIR) and light reflection, both coupled to a light emitting source, such as fluorescent tubes (34) and other linearly shaped light sources. Light reflectors (32) are shaped to concentrate light onto non-imaging optics lens (30) so as to compensate for non-linear characteristics of the TIR lenses.

REFERENCES:
patent: 5143433 (1992-09-01), Farrell
patent: 5211463 (1993-05-01), Kalmanash
patent: 5404869 (1995-04-01), Parkyn, Jr. et al.
patent: 5479275 (1995-12-01), Abileah
patent: 5587816 (1996-12-01), Gunjima et al.
patent: 5720545 (1998-02-01), Shaw

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