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Planar illumination device

A lighting device and plane technology, which is applied to lighting devices, fixed lighting devices, and components of lighting devices, etc., can solve the problems of bright lines and leakage of illumination light at the connecting part, so as to reduce light leakage and suppress the generation of bright lines. Effect

Inactive Publication Date: 2011-03-30
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of arranging a plurality of light guide plates in series to form a large-surface light source, when the large-surface light source emits light, a very small amount of illumination light leaks from the joint between the light guide plates, causing scattering at the boundary surface, thereby May produce bright lines in connection

Method used

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Experimental program
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no. 1 approach

[0023] Modification

no. 2 approach

[0025] first embodiment

[0026] figure 1 is a perspective view showing the configuration of a main part of the planar lighting device 1 according to the first embodiment of the present invention. For example, the planar lighting device 1 is used as a backlight of a liquid crystal display or the like, and in the planar lighting device 1 , the light guide plate 10 is formed by closely arranging a plurality of unit light guide plates in one row or two or more. Here, the light guide plate 10 composed of two unit light guide plates 11 and 12 will be described below.

[0027] In the planar lighting device 1 , the light source 13 is arranged on the side S3 (first side) of each of the unit light guide plates 11 and 12 along the arrangement direction (X direction) of the unit light guide plates 11 and 12 . The unit light guide plates 11 and 12 each have, for example, a rectangular planar shape, and the rear surface of each unit light guide plate 11 and 12 is a reflective surface S1,...

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PUM

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Abstract

The present invention discloses a planar illumination device, including: a light guide plate formed by arranging a plurality of unit light guide plates each having a light emission surface as a front surface and a reflection surface as a back surface so that facing end surfaces of adjacent unit light guide plates of the plurality of unit light guide plates are closely arranged; one or two or more light sources arranged on a first side surface, in a direction where the plurality of unit light guide plates are arranged, of each of the plurality of unit light guide plates; and a recessed-and-projected structure arranged on a second side surface, facing the light sources, of each of the plurality of unit light guide plates and having an edge parallel to a normal to the light emission surface.

Description

[0001] References to related applications [0002] The present application contains subject matter related to Japanese Priority Patent Application JP 2009-186734 filed in the Japan Patent Office on Aug. 11, 2009, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to a planar lighting device that performs large-surface light emission by continuously arranging a plurality of unit light guide plates. Background technique [0004] In recent years, liquid crystal display panels, advertising boards for indoors and outdoors, notice boards, and the like have become larger, and therefore, larger light guide plates are required as backlights for these devices. [0005] However, it is difficult to form a large light guide plate, and the cost of forming a large light guide plate is high. Therefore, a method of forming a large-surface light source by sequentially arranging a plurality of unit light guide plates is cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S8/00F21V8/00F21V17/00F21V19/00F21V5/02G02F1/13357
CPCG02B6/0038G02B6/0018
Inventor 桑山哲朗
Owner SONY CORP
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