Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Patent
1996-08-08
1997-12-30
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Particular illumination
362 31, G02F 11335, F21V 704
Patent
active
057036675
ABSTRACT:
A light guide plate is provided which utilizes the phenomenon of diffraction based on wave optics of light, and which can provide much higher and more uniform brightness over an entire illuminated surface than the brightness level achievable by the prior art and can assure longer battery life through reduced power consumption for a light source. The light guide plate consists of a transparent plate, at least on one end of which light rays from the light source fall. The light guide plate has a diffraction grating printed or worked on a bottom surface thereof such that at least one of a grating part width
on-grating part width ratio in unit-width or a sectional configuration of the diffraction grating is varied so as to enhance and uniform light intensity on a top surface of the light guide plate.
REFERENCES:
patent: 4798448 (1989-01-01), Raalte
patent: 5353133 (1994-10-01), Bernkopf
patent: 5418631 (1995-05-01), Tedesco
patent: 5451980 (1995-09-01), Simon et al.
patent: 5566007 (1996-10-01), Ikeda et al.
patent: 5594830 (1997-01-01), Winston et al.
Nguyen Tcep H.
Shimada Precision, Co., Ltd.
Sikes William L.
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