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

2007-12-03

2008-11-04

Tso, Laura (Department: 2875)

Illumination

Light modifier

Refractor

C362S330000, C362S339000, C362S309000, C362S223000, C362S240000, C362S246000, C362S323000

Reexamination Certificate

active

07445361

ABSTRACT:
An exemplary prism sheet includes a transparent main body. The main body includes a first surface, a second surface opposite to the first surface, a plurality of elongated waved protrusions formed in the first surface, and a plurality of micro-depressions formed in the second surface. Each of micro-depressions has four connecting sidewalls. A transverse width of each sidewall progressively decreases with increasing distance from a bottom surface that is coplanar with the second surface. A backlight module using the present prism sheet is also provided.

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

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