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Area light source apparatus and liquid crystal display

A surface light source and light source technology, which can be applied to light sources, electric light sources, lighting devices, etc., can solve the problems of difficulty in forming an organic EL layer with a uniform thickness, and difficulty in manufacturing large-area light source devices with high yields.

Inactive Publication Date: 2005-05-25
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to form an organic EL layer with a uniform thickness and a large area
Therefore, in the prior art, it is difficult to manufacture a large-area light source device with high yield

Method used

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  • Area light source apparatus and liquid crystal display
  • Area light source apparatus and liquid crystal display
  • Area light source apparatus and liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0055] The first embodiment has the following advantages.

[0056] (1) The surface light source device has a first surface light source 14 composed of an organic EL device 13 disposed on the light incident surface 12a of a transparent substrate 12 and a surface light source composed of other light sources (ie, LED21) except the organic EL device 13 15. Thus, the area of ​​the entire light-emitting surface is larger than the area of ​​the light-emitting surface of the organic EL device 13 . Therefore, the light of the second surface light source 15 covers a wider area than the area of ​​the light emitting surface of the first surface light source 14 composed of the organic EL devices 13 . Overall, an area wider than the area of ​​the light emitting surface of the organic EL device 13 is irradiated.

[0057] (2) The second surface light sources 15 each include a light guide sheet 20 optically continuous with the transparent substrate 12 . Other light sources (ie, LEDs 21 ) ot...

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PUM

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Abstract

A surface light source device (11), comprising a light emitting surface. The surface light source device is provided with a first surface light source (14) comprising a transparent substrate (12) having a light incident surface (12a) and an EL device (13) arranged on the light incident surface. The EL device includes a light emitting surface from which light exits. The second surface light source (15) includes LEDs (21). The light emitting surface of the surface light source device has a larger area than the light emitting surface of the EL device.

Description

technical field [0001] The invention relates to a surface light source device and a liquid crystal display, in particular to a surface light source device and a liquid crystal display using EL devices. Background technique [0002] In the prior art, EL panels for lighting and having electroluminescence (EL) devices mounted on a transparent substrate have been proposed. EL panels can function as backlights for liquid crystal displays. [0003] In the prior art, the area of ​​the light-emitting surface of the organic EL panel is equal to the area of ​​the light-emitting portion (organic EL layer) of the organic EL device disposed on the transparent substrate. [0004] Japanese Unexamined Patent Publication No. 2002-100229 discloses a light source device 50 as a backlight for a liquid crystal display. See Figure 12A and 12B . The light source device 50 includes an upper light source 54 and a lower light source 55 . The upper light source 54 includes blue LED light sources...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357F21V8/00G02B6/00H01L51/50H05B33/12
CPCG02B6/0038G02B6/0041G02B6/0046G02B6/0068G02F1/1335
Inventor 竹内范仁
Owner TOYOTA IND CORP