Illumination – Display backlight – Lcd backlight
Patent
1998-08-19
2000-08-01
Husar, Stephen
Illumination
Display backlight
Lcd backlight
362 30, G09F 1304
Patent
active
060956569
ABSTRACT:
A backlighting apparatus for radiating light on a flat surface to be illuminated comprises a light source having a linear light emitting portion, a light shield section, provided along an outer periphery of the light source on the side of the to-be-illuminated surface, for shielding light traveling directly from the light source toward the to-be-illuminated surface, and a first optical element provided in a longitudinal direction of the light source such that the first optical element faces the light source, the first optical element having a reflection surface for reflecting light emitted from the light source toward the to-be-illuminated surface. A cross-sectional shape of the reflection surface in a direction perpendicular to the longitudinal direction of the light source is determined such that light reflected by the reflection surface of the first optical element has a substantially uniform illuminance distribution on the to-be-illuminated surface.
REFERENCES:
patent: 4989122 (1991-01-01), Allekotte et al.
patent: 5396350 (1995-03-01), Beeson et al.
patent: 5459592 (1995-10-01), Shibatani et al.
patent: 5504545 (1996-04-01), Hagihara et al.
Honguh Yoshinori
Shimura Kei
Husar Stephen
Kabushiki Kaisha Toshiba
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