Bottom lighting backlight module having uniform illumination...

Details Bottom lighting backlight module having uniform illumination... Bottom lighting backlight module having uniform illumination...

2008-05-20

2008-05-20

Quach-Lee, Y. My (Department: 2885)

Illumination

Plural light sources

With modifier

C362S029000, C362S327000

Reexamination Certificate

active

07374312

ABSTRACT:
The present invention provides a bottom lighting backlight module comprising: a light reflecting plate, a plurality of light sources such as lamp and LED; and a diffusion sheet; wherein said diffusion sheet has an excavated structure of shape with cross-section of an inverted triangle having a specific apex angle ranging from 110 degrees to 130 degrees. Some of the light incident on the excavated structure inside the diffusion sheet can be totally reflected and redirected sideways, so that it is possible to reduce the local brightness for area around each light source but significantly improve the evenness of brightness for the whole module.

REFERENCES:
patent: 3351753 (1967-11-01), Berger
patent: 5253151 (1993-10-01), Mepham et al.
patent: 5720545 (1998-02-01), Shaw
patent: 5986728 (1999-11-01), Bernard
patent: 6193383 (2001-02-01), Onikiri et al.
patent: 6421103 (2002-07-01), Yamaguchi
patent: 6639350 (2003-10-01), Sejkora
patent: 2001/0002878 (2001-06-01), Sejkora et al.

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