Light guide plate having high-density dots

Details Light guide plate having high-density dots Light guide plate having high-density dots

2005-09-16

2008-07-22

Font, Frank G (Department: 2883)

Optical waveguides

Noncyclindrical or nonplanar shaped waveguide

C362S307000, C362S309000, C362S317000, C362S326000, C362S327000, C362S328000, C362S329000, C362S330000

Reexamination Certificate

active

07403691

ABSTRACT:
A light guide plate (10) includes a pair of opposite incidence surfaces (101, 103), an emission surface (108) and a bottom surface (109) opposite to the emission surface. A plurality of dots (11) is distributed on the bottom surface, and each dot is shaped as a rectangle or a square with two cutouts formed at two opposite sides thereof respectively. Thus, a clearance between adjacent dots is relatively small. That is, a distribution of the dots is relatively compact, and this ensures that the light guide plate can provide emission of light beams with good uniformity. Furthermore, adjacent rows of dots are offset, and this can avoid bright lines. Thus, the light guide plate can provide improved display quality. Therefore, the light guide plate can be advantageously applied in back light systems of liquid crystal display devices.

REFERENCES:
patent: 5363294 (1994-11-01), Yamamoto et al.
patent: 6754419 (2004-06-01), Ide et al.
patent: 2002/0041349 (2002-04-01), Ohkawa
patent: 2004/0136077 (2004-07-01), Leu et al.
patent: 2004/0212984 (2004-10-01), Chen
patent: 2004/0239832 (2004-12-01), Saito
patent: M 2001-273805 (2001-10-01), None

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