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Surface light source device and liquid cristal display device using the same

A surface light source and light source technology, applied in the field of surface light source devices and liquid crystal display devices, can solve the problems such as the decrease of the front brightness of the liquid crystal display device and the increase of the curvature radius of the top of the prism, and the effect of preventing the damage of the prism and being easy to handle.

Inactive Publication Date: 2007-11-14
ORMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such resins cannot achieve good transferability like conventional UV curable resins, and the radius of curvature at the top of the prism becomes large during molding, which reduces the front brightness of the liquid crystal display device.

Method used

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  • Surface light source device and liquid cristal display device using the same
  • Surface light source device and liquid cristal display device using the same
  • Surface light source device and liquid cristal display device using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] FIG. 1 is a schematic cross-sectional view of a liquid crystal display device 101 according to Embodiment 1 of the present invention. Of these, FIG. 1 is a diagram schematically showing that the liquid crystal display device 101 is actually formed in a thin planar shape in the thickness direction. The liquid crystal display device 101 is composed of a liquid crystal panel 117 , a surface light source device 102 , and a holder 118 for fixing and holding the liquid crystal panel 117 and the surface light source device 102 .

[0072] The liquid crystal panel 117 and the surface light source device 102 are arranged so that the liquid crystal panel 117 faces the light emitting side of the surface light source device 102 , and are housed in a through hole 127 formed in the center of the holder 118 . In addition, the liquid crystal panel 117 is slightly larger than the surface light source device 102, and is fixed and held by the first double-sided adhesive tape 120 on the ste...

Embodiment 2

[0098] Example 2 differs from Example 1 in the configuration of the protective sheet 112 used in the liquid crystal display device 101 . FIG. 11 shows a side view of a protective sheet 211 used in Example 2 of the present invention. In the protection sheet 211 , a first transparent rubber-like resin 212 is formed on a transparent substrate 114 , and a second transparent rubber-like resin 213 is formed on the first transparent rubber-like resin 212 . The transparent rubber-like resin has a double-layer structure. For example, in the protective sheet 211 , the second transparent rubber-like resin 213 is mainly configured to prevent optical contact with the prism sheet 115 , and the first transparent rubber-like resin 212 is configured to prevent the prism portion 116 from being damaged by external force. That is, the second transparent rubber-like resin 213 uses a slightly harder transparent rubber-like resin, which has the characteristics that it will not be deformed due to the...

Embodiment 3

[0101] Example 3 differs from Example 1 in the configuration of the protective sheet 112 used in the liquid crystal display device 101 . FIG. 12 shows a side view of a protective sheet 214 used in Example 3 of the present invention. The protective sheet 214 is formed on the transparent substrate 114 with a transparent rubber-like resin 215 in which particles 216 and the like are mixed. In this way, the prism sheet 115 is prevented from being damaged due to external force, and also functions as a diffusion plate, thereby reducing brightness unevenness.

[0102]By mixing the particles 216 and the like into the transparent rubbery resin 215 , the front brightness decreases compared with the case where no particles are mixed, so it is necessary to mix the particles 216 at a density within a range that can ensure the required front brightness. In addition, by partially changing the density of the particles 216 in the transparent rubber-like resin 215 , it is possible to add a func...

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Abstract

A protection sheet (112) constructed by forming a transparent rubber-like resin (113) on a transparent substrate (114) is placed between a light emission surface (123) of a light guide plate (111) and a surface on which prism sections (116) of a prism sheet (115) are formed. The placement of the protection sheet (112) is such that the tops of the prism sections (116) and the transparent rubber-like resin (113) are in contact with each other. When there is no external force acting on the prism sheet, the transparent rubber-like resin (113) holds the prism sheet without deformation and intimate optical contact does not occur between the prism sheet (115) and the protection sheet (112). On the other hand, when external force acts on the prism sheet, the transparent rubber-like resin (113) deforms to prevent damage on the prism section (116).

Description

technical field [0001] The present invention relates to a surface light source device and a liquid crystal display device using the same. In particular, the present invention relates to a surface light source device capable of preventing the prism sheet from being damaged by external force in a surface light source device using a prism sheet to improve light utilization efficiency. Background technique [0002] In the surface light source device, there is a device that uses a prism sheet to deflect the light emitted from the light exit surface of the light guide plate in a direction perpendicular to the light exit surface, thereby improving the utilization efficiency of the light. As one example, there is an invention disclosed in JP-A-2003-215584 (Patent Document 1). [0003] FIG. 19 is a cross-sectional view showing the structure of a conventional liquid crystal display device 401 (for example, Patent Document 1). The liquid crystal display device 401 is composed of a li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V8/00G02B5/02G02B5/04G02F1/13357F21Y101/02G02F1/1335
CPCG02B1/105G02B6/0038G02B6/005G02B1/14
Inventor 上野佳宏竹村宏一幕田功篠原正幸
Owner ORMON CORP