Prism sheet and backlight module using the same

Details Prism sheet and backlight module using the same Prism sheet and backlight module using the same

2007-12-17

2009-12-29

Alavi, Ali (Department: 2875)

Illumination

Edge lighted panel

Light modifier with emission face combined with light guide...

C362S626000, C362S627000, C362S333000, C362S337000, C359S599000

Reexamination Certificate

active

07637645

ABSTRACT:
An exemplary prism sheet (20) includes a transparent main body. The main body includes a first surface (201), a second surface (202) opposite to the first surface, a plurality of first micro-depressions (203) defined in the first surface, and a plurality of second micro-depressions (204) defined in the second surface. Each of the first micro-depressions is conical frustum-shaped. Each of the first micro-depressions has four inner side surfaces connected to each other. A transverse width of each inner side surface of the first micro-depressions progressively decreases with increasing distance from its bottom surface that are coplanar with one of the first surface of the transparent main body. A backlight module (200) using the present prism sheet is also provided.

REFERENCES:
patent: 3721818 (1973-03-01), Stahlhut
patent: 6964497 (2005-11-01), Greiner
patent: 7121709 (2006-10-01), Shinohara et al.
patent: 2007/0171671 (2007-07-01), Kurokawa et al.

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