Direct-type backlight device

Details Direct-type backlight device Direct-type backlight device

2005-08-23

2010-06-01

Cariaso, Alan (Department: 2885)

Illumination

Display backlight

C362S217050, C362S217090, C362S224000, C362S225000, C362S308000, C362S330000, C362S331000

Reexamination Certificate

active

07726826

ABSTRACT:
A thin direct-type backlight capable of realizing high brightness uniformity is provided by a specific configuration of the direct-type backlight whereby high light beam utilization ratio is maintained while periodical unevenness of the light emitting surface is suppressed. In a direct-type backlight device having a plurality of linear light sources in parallel, a reflection plate and a light diffusion plate, at least one of main surfaces of the light diffusion plate is provided with a prismatic ridges having a sawtooth-shaped cross-section. The apex angle “y” (degree) of the prismatic ridge of the light diffusion plate, the distance “a” (mm) between centers of the adjacent linear light sources, and the distance “b” (mm) from a center of the linear light sources to a surface of the light diffusion plate facing the light source satisfy the relationship of 80×(b/a)+15<y<180×(b/a)+70.

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English translation of Yamada et al (JP 05-333333), Dec. 17, 1993.
Japanese Office Action for application No. 2004-243479, dated Jan. 12, 2010.

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