Title:
PLANAR LIGHT SOURCE APPARATUS AND DISPLAY APPARATUS USING SAME
Document Type and Number:
WIPO Patent Application WO/2011/135627
Kind Code:
A1
Abstract:
In a planar light source apparatus, light from a point like light source is reflected on a side surface of a light guide plate, preventing light from uniformly spreading and thus causing brightness unevenness, and light exits from the light guide plate and is reflected on a reflection plate, which arises a problem of a low light use efficiency. Disclosed is a planar light source apparatus (100) which is provided with a point like light source (16) and a light guide plate (13) having a rectangular, flat plate shape in a plan view. The light guide plate has a light exiting surface, which faces an opening portion, a pair of second side surfaces (13b), which face each other, and a hole (13c), which is formed on a position where the point like light source (16) is disposed and is opened on an opposite light exiting surface in the vicinity of one first side surface (13a). A ridge line is provided in a direction perpendicular to the light exiting surface (1a), and at least a part of the surfaces of the pair of second side surfaces is a prism having a saw-shaped, repetitive concavo-convex cross section in a direction parallel to the light exiting surface (1a), with the result that light from the point like light source can be efficiently uniformed on the light guide plate, and the brightness unevenness can be prevented.
Inventors:
SAKAI, Seiji (7-3Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
Application Number:
JP2010/003056
Publication Date:
November 03, 2011
Filing Date:
April 28, 2010
Export Citation:
Assignee:
Mitsubishi Electric Corporation (7-3Marunouchi 2-chome, Chiyoda-ku Tokyo, 10, 〒1008310, JP)
三菱電機株式会社 (〒10 東京都千代田区丸の内二丁目７番３号 Tokyo, 〒1008310, JP)
三菱電機株式会社 (〒10 東京都千代田区丸の内二丁目７番３号 Tokyo, 〒1008310, JP)
International Classes:
F21S2/00; F21Y101/02
Attorney, Agent or Firm:
TAKAHASHI, Shogo et al. (7-3Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
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Claims: