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Surface light source device

A surface light source and light source technology, applied in the direction of light source, identification device, point light source, etc., can solve the problems of uneven brightness of surface light source device 1, low brightness of surface light source device 1, and poor combination effect

Inactive Publication Date: 2005-03-16
ORMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] but if image 3 As shown, when a point light source 7 is used to make the surface light source device 1 emit light, the light f from the point light source 7 is totally reflected by the light incident surface 8 of the light guide plate 2, so the combination effect with the light guide plate 2 is not good, and the surface The brightness of the light source device 1 is low
And the corner portion 11 of the light guide plate 2 ( image 3 Areas with oblique lines in the center) until the corners of the effective area R are dark, and large brightness unevenness occurs in the surface light source device 1

Method used

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Examples

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Embodiment 1

[0039] Figure 4 It is a perspective view showing the surface light source device 21 of Embodiment 1 of the present invention, Figure 5 It is a longitudinal section view of its partial section. In this surface light source device 21, a light emitting surface 23 is formed on the upper surface of a light guide plate 22 formed of a transparent resin material with a large refractive index, and a diffusion pattern (not shown) formed by concave-convex processing and dot printing of diffuse reflection ink is formed on the lower surface. ). A reflective plate 24 is arranged under the light guide plate 22, which is made of a material with high surface reflectivity, such as a hard or relatively soft white plastic plate. The central rectangular area of ​​the light exit surface 23 is the effective area R. As shown in FIG. The effective region R is a region facing the region where the pixels of the liquid crystal display are formed, for example, when used as a surface light source devi...

Embodiment 2

[0044] Figure 7 It is a perspective view showing the surface light source device 41 of Embodiment 2 of the present invention, Figure 8 It is a longitudinal section view of its partial section. The hollow portion 42 of the surface light source device 41 is cylindrical and passes through the light guide plate 22 . As shown in the present embodiment and the following embodiments, the shape of the space 42 is not particularly limited, and the influence of the shape on the luminance distribution is different.

[0045] Such as Figure 8 As shown, the light emitted from the light emitting portion 26 is the same as in the first embodiment, and the light efficiently combined with the light guide plate 22 and reaching the void 42 is reflected in the general surface direction of the light guide plate 22 and diffused throughout the light guide plate 22 . At this time, the light is totally reflected backward on the boundary surface between the light guide plate 22 and the space 42, so...

Embodiment 3

[0047] Figure 9 It is a perspective view showing a surface light source device 43 according to Embodiment 3 of the present invention, Figure 10 It is the longitudinal sectional view of the same partial section as above. The hollow part 44 of the surface light source device 43 does not penetrate the light guide plate 22 , that is, it is a cylinder that does not reach the light emitting surface 23 in the second embodiment. In this way, as long as the space 44 is a structure that does not reach the light exit surface 23, the leakage of the light f from the space 44 in the thickness direction of the light guide plate 22 can be reduced ( Figure 10 shown by the dotted line in the middle), to prevent the reduction of the uniformity of the brightness distribution.

[0048] Such as Figure 10 As shown, the light emitted from the light emitting portion 26 is the same as in the first embodiment, and the light efficiently combined with the light guide plate 22 and reaching the void ...

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PUM

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Abstract

Provided is a surface light source device equalized in luminance distribution, and improved in luminance. This surface light source device comprises a point light source-like light emission part 26 emitting light, and a light guide plate 22 for shutting up the light introduced from a light incident surface and taking out the light to the outside from a light emission surface 23. The lower face of the light guide plate 22 is formed with a diffusion pattern, and the light guide plate 22 is formed with a conical vacant space 27 in front of the light emission part 26. By making the light emitted from the light emission part 26 reflect on an interface of the vacant space 27, the light is advanced to a corner part of the light guide plate 22.

Description

technical field [0001] The invention relates to a surface light source device. More specifically, the present invention relates to surface light source devices used in liquid crystal display devices, lighting devices, and the like. Background technique [0002] (the first conventional example) [0003] Using the surface light source device 1 of the conventional example figure 1 The exploded perspective view of and figure 2 sectional view representation. The surface light source device 1 includes: a light guide plate 2 that confines light therein, a light emitting portion 3 and a reflector 4 . The light guide plate 2 is molded with a transparent resin with a high refractive index such as polycarbonate resin and methacrylic synthetic resin, and a diffusion pattern 5 is formed on the lower surface of the light guide plate 2 by embossing and dot printing of diffuse reflection ink. The light emitting unit 3 is formed by mounting a plurality of so-called point light sources ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357F21V8/00F21Y101/02G02B5/02G02F1/1335G09F9/35
CPCG02F1/133504G02F1/133524G02F1/133553
Inventor 篠原正幸青山茂
Owner ORMON CORP
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