Backlight unit

Details Backlight unit Backlight unit

2005-12-27

2005-12-27

Tso, Laura K. (Department: 2875)

Illumination

Revolving

C362S297000, C359S599000

Reexamination Certificate

active

06979095

ABSTRACT:
A backlight unit includes a light guide panel where a holographic pattern is formed. A point light source emits light to an edge of the light guide panel. A refractive member is provided between the point light source and the light guide panel and reduces an azimuth angle of light incident on the light guide panel. The refractive member includes, from an optical axis of the point light source, a light transmission zone transmitting light as it is, a blaze zone where a blaze pattern having a saw-toothed shape in which one surface near the optical axis and substantially parallel to the optical axis is formed, and a prism zone where a triangular prism pattern is formed. The backlight unit may further include a diffusive member diffusing light emitted from the point light source to be incident on the refractive member.

REFERENCES:
patent: 6139163 (2000-10-01), Satoh et al.
patent: 6598998 (2003-07-01), West et al.
patent: 6799860 (2004-10-01), Nakaoka et al.
patent: 2002/0181222 (2002-12-01), Boyd et al.
patent: 2002-184225 (2002-06-01), None
patent: 2001-0008540 (2001-02-01), None

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