Diffusion sheet and method of manufacturing the same, backlight, and liquid crystal display device

A diffusion sheet and structure technology, applied in optics, optical components, optical components, etc., can solve problems such as insufficient brightness, achieve the effects of improving brightness, good light-gathering function, and suppressing the generation of moiré fringes

Active Publication Date: 2010-12-08
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, because above-mentioned existing diffusion sheet brightness is not enough sometimes, thereby urgently need to improve the brightness of diffusion sheet

Method used

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  • Diffusion sheet and method of manufacturing the same, backlight, and liquid crystal display device
  • Diffusion sheet and method of manufacturing the same, backlight, and liquid crystal display device
  • Diffusion sheet and method of manufacturing the same, backlight, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0040] 1. First Embodiment (Example of Diffusion Sheet)

[0041] 2. Second Embodiment (Example of Applying a Diffusion Sheet to a Liquid Crystal Display Device)

[0042]

[0043] [1.1. Composition of diffuser]

[0044] figure 1 A is an enlarged partial perspective view showing the diffusion sheet according to the first embodiment of the present invention. figure 1 B is an enlarged partial plan view showing the diffusion sheet according to the first embodiment of the present invention. Such as figure 1 A. figure 1 As shown in B, the diffusion sheet 1 includes a base 11 having two main surfaces (a first main surface and a second main surface) and a convex structure 12 formed on one of the two main surfaces of the base 11 . The diffusion sheet 1 is provided with a function of diffusing or concentrating light at the interface of the structure body 12 .

[0045] (substrate)

[0046] As the substrate 11, for example, a transparent sheet or the like can be used. Sheets are ...

no. 2 approach

[0092] [Structure of Liquid Crystal Display Device]

[0093] (first configuration example)

[0094] Figure 5 A is a schematic diagram illustrating a first configuration example of a liquid crystal display device according to a second embodiment of the present invention. Such as Figure 5 As shown in A, this liquid crystal display device has a backlight 6 that emits light, and a liquid crystal panel 7 that modulates the light emitted from the backlight 6 temporally and spatially to display an image.

[0095] Hereinafter, the backlight 6 and the liquid crystal panel 7 constituting the liquid crystal display device will be sequentially described.

[0096] (backlight)

[0097] As the backlight 6 , for example, a direct type backlight, an edge type backlight, or a planar light source type backlight can be used. Figure 5 A is an example in which the backlight 6 is a direct type backlight. The backlight 6 includes, for example, a reflection sheet 4 , a light source 5 , a diff...

Embodiment 1

[0131] First, a cylindrical master substrate made of a metal having good thermal conductivity is prepared. Then, a resist layer was formed on the outer peripheral surface of the cylindrical master substrate. A random pattern of circles with a diameter of 70 μm was then generated by computer. Next, based on the generated pattern, the resist layer formed on the outer peripheral surface of the master substrate is exposed with laser light, and the exposed resist layer is then developed. In this way, openings corresponding to the aforementioned generated patterns are formed on the resist layer. Then, using the resist layer in which the openings were formed as a mask, wet etching was performed on the outer peripheral surface of the substrate for mastering. In this way, a roll master in which structures having a partially spherical shape are randomly formed on the outer peripheral surface is obtained. Then, after mounting the roll master on a molding device, a polycarbonate sheet ...

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Abstract

The invention provides a diffusion sheet and a method of manufacturing the same, a backlight, and a liquid crystal display device. The diffusion sheet includes: a substrate having a first principal surface and a second principal surface; and structures each in a convex shape formed randomly on the first principal surface or the second principal surface of the substrate. The structures have an identical or almost identical height. The structures have an aspect ratio h/r, where r denotes an average radius of the structures and h denotes an average height of the structures, of more than 0.85 and not more than 1.50. The structures have a filling factor of not less than 60% and not more than 80%.

Description

technical field [0001] The present invention relates to a diffusion sheet, a manufacturing method thereof, a backlight having the diffusion sheet, and a liquid crystal display device. Specifically, it relates to a diffusion sheet having convex structures formed on the surface. Background technique [0002] Currently, various optical sheets are used in backlights incorporated into liquid crystal display devices. A diffusion sheet can be exemplified as one of the most important optical sheets among various optical sheets. The diffusion sheet generally has: a sheet formed of a resin material such as polyethylene terephthalate; and a diffusion layer formed by applying and curing a resin composition in which resin beads are dispersed on the sheet ( For example, refer to Patent Document 1). Light incident from the light source is diffused or condensed by the resin beads in the diffusion layer in the diffusion sheet having such a configuration. [0003] In recent years, as the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02G02F1/13357
CPCG02B3/0043B29D11/00B29D11/00798G02B3/0031G02B3/0062G02B5/02G02F2001/133607G02F1/133606G02B3/0056G02F1/13362G02F1/133607C08J5/18G02F1/1335G02B5/045
Inventor 柴田章广佐佐木纯对木洋文堀井明宏平井基介水野裕浅冈聪子桥本香奈子工藤泰之林沙织宫内贞一关野智之青木诚
Owner SONY CORP
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