Method and device to improve backlight uniformity

Details Method and device to improve backlight uniformity Method and device to improve backlight uniformity

2006-08-28

2008-08-19

Connelly-Cushwa, M. R. (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S039000, C385S901000, C362S561000, C362S552000, C362S610000, C362S615000, C349S062000

Reexamination Certificate

active

07415176

ABSTRACT:
A hot spot filter for a light guide is created by taking an image of the light output pattern of an illiuminated light guide. The hot spot filter may be a film, a layer, or an additional liquid crystal display dedicated to attenuating bright spots from the light guide. The hot spot filter may be incorporated into the image display by adjusting the grey scale of individual pixels to provide sufficient compensation.

REFERENCES:
patent: 5359342 (1994-10-01), Nakai et al.
patent: 5477422 (1995-12-01), Hooker et al.
patent: 5680233 (1997-10-01), Faris et al.
patent: 2002/0163529 (2002-11-01), Evanicky
patent: 2004/0263718 (2004-12-01), Tsai
patent: 2005/0030732 (2005-02-01), Kimura et al.

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