Direct-type backlight device

Details Direct-type backlight device Direct-type backlight device

2007-07-18

2010-12-28

Alavi, Ali (Department: 2875)

Illumination

Display backlight

C362S225000, C362S339000, C362S331000, C349S064000

Reexamination Certificate

active

07857475

ABSTRACT:
Provided is a direct-type backlight device having a sufficient luminance in a front direction and capable of suppressing a luminance unevenness on a light emitting plane with a reduced electric power consumption. In the direct-type backlight device having linear light sources2, a reflecting plate3and a light diffusing member 1, a distance (a) between centers of the adjacent two linear light sources is 30 to 65 mm. The light diffusing member 1 has an approximately flat light incident plane1A and a light outgoing plane1B on which multiple linear prisms4are aligned. The linear prism4has two inclined surfaces4A having an approximately equal tilt angle against a plane which is perpendicular to a thickness direction of the light diffusing member 1. A relationship of (a)/7<L<(a)/4 is satisfied wherein L is a distance (mm) between a central position S of one image in two images on the light outgoing plane corresponding to one linear light source and a position R at which a center of the one linear light source is projected on the light outgoing plane.

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patent: WO-2006/022270 (2006-03-01), None

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