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Light guide plate and surface illumination device

A technology of a light guide plate and a light incident surface, which is applied in the directions of electric light sources, lighting devices, optical waveguides and light guides, can solve the problems of producing color spots and insufficient suppression of color spots, and achieves the goal of suppressing and reducing color spots. Effect

Active Publication Date: 2014-08-06
株式会社东北电子
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the color of the light emitted from the light source (LED light source) gradually changes as the light direction is inclined from the front direction of the light source (hereinafter referred to as the direction of the optical axis C), so there are the following problems: In the surface light source device described above, color unevenness occurs between the light emitted from the light emitting surface in front of the light source and the light emitted from the light emitting surface at the end portion of the light guide plate.
However, in practice, even this structure has limitations and is not sufficient in the suppression of stains.

Method used

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  • Light guide plate and surface illumination device
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  • Light guide plate and surface illumination device

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no. 1 approach ）

[0086] Below, refer to Figure 4 ~ Figure 8 The surface light source device 31 according to the first embodiment of the present invention will be described. Figure 4 is a perspective view showing the surface light source device 31 according to the first embodiment of the present invention, Figure 5A is its top view. in addition, Figure 5B yes Figure 5A XX-line cross-sectional view of FIG. 10 , which shows an enlarged cross-section of the lenticular lens 36 provided on the surface of the light guide plate 33 . Figure 6 It is a schematic cross-sectional view obtained when the surface light source device 31 is cut longitudinally, and shows the trajectories of light rays in a plane perpendicular to the light incident surface 38 and the light exit surface 39 of the light guide plate 33 . Figure 7 It is a diagram showing a cross section of the directivity conversion pattern 40 on a cross section parallel to the light incident surface 38 of the light guide plate 33 , and sh...

no. 2 approach ）

[0120] Figure 19 It is a perspective view showing the surface light source device 61 according to the second embodiment of the present invention. Figure 20 It is a plan view of the surface light source device 61 . Figure 21 The cross-sectional shape of the directivity conversion pattern 40 on a cross-section parallel to the light incident surface 38 is shown. In addition, in Figure 21 In , a part of the directivity conversion pattern 40 is enlarged and shown.

[0121] In the surface light source device 61 according to the second embodiment of the present invention, in the vicinity of the optical axis C of the point light source 32 , the directivity conversion pattern 40 is partially removed to form a flat surface 62 (mirror surface). In particular, in the illustrated example, triangular flat surfaces 62 sandwiched between the left and right directivity conversion patterns 40 are provided.

[0122] Such as Figure 21 As shown, in the left and right directivity conversion...

no. 3 approach ）

[0126] Figure 23 It is a perspective view of a surface light source device 71 according to a third embodiment of the present invention. Figure 24A is a plan view of the surface light source device 71 . Figure 24B yes Figure 24A The Y-Y line profile.

[0127] In the surface light source device 71 of the third embodiment, a light diffusion pattern 72 for laterally diffusing the directivity of reflected light is further formed on the upper surface and / or the lower surface of the light introduction portion 35 . Such as Figure 24B As shown, the light diffusion pattern 72 may be a pattern in which V-grooves 72a extending vertically are arranged parallel to each other, or may be a lenticular pattern or a pattern of any shape. In this structure, the light is diffused laterally by the light diffusion pattern 72 and directed toward the side surface of the light guide plate 33 , thereby preventing the side edge portion of the light exit surface 39 from being darkened. Furthermo...

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Abstract

A light guide plate includes a light introduction unit that confines light incident from a point light source through the light incident surface and a light guide plate body thinner than the maximum thickness of the light introduction unit. The light introduction unit includes an inclined surface inclined toward an end of a surface of the light guide plate body from a surface in a portion having the thickness greater than that of the light guide plate body. The light guide plate body includes a directivity conversion pattern located between the light introduction unit and an effective illumination region of the light guide plate body on at least one of a surface at a light emergent side and an opposite surface thereof. The directivity conversion pattern converts a directivity direction of the light passing through an effective illumination region from the light introduction unit such that an angle formed by the light and a direction perpendicular to the light incident surface increases when viewed from a direction perpendicular to a light exit surface.

Description

technical field [0001] The invention relates to a light guide plate and a surface light source device. Specifically, it relates to a surface light source device used as a backlight of a liquid crystal display device or the like, and a light guide plate used for the surface light source device. Background technique [0002] In recent years, along with the reduction in thickness of mobile devices incorporating surface light source devices, reduction in thickness of surface light source devices has also been demanded. In order to reduce the thickness of the surface light source device, it is necessary to reduce the thickness of the light guide plate. However, even if the thickness of the flat light guide plate can be reduced, there is a limit to reducing the height of the light source composed of LED (light-emitting diode: light-emitting diode). Therefore, in the case of using a flat light guide plate, since the height of the light source is greater than the thickness of the ...

Claims

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Application Information

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IPC IPC(8): G02B6/00F21S8/00F21V8/00G02F1/13357
CPCG02B6/0016G02B6/0018G02B6/002G02B6/0038G02B6/10G02B6/12G02F1/1335
Inventor 仓田刚大
Owner 株式会社东北电子
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