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Light-diffusing structure

A structure and light diffusion technology, applied in optics, optical components, nonlinear optics, etc., can solve problems such as easy scars on the surface of the light diffusion layer, brightness reduction, and resin particles falling off

Inactive Publication Date: 2010-12-15
KYOWA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, if an organic solvent is used in the process of removing attached foreign matter, the resin particles will be cracked and the brightness will decrease, which will be the main cause of the decrease in production efficiency.
[0008] In addition, there is a disadvantage that the light-diffusing structure is often circulated in rolls, and if foreign matter adheres, it is easy to cause scratches on the surface of the light-diffusing layer.
[0009] Moreover, due to the high price of silica particles, if cheap resin particles are used, light diffusion surfaces are likely to appear in the film processing process, when punching the structure with a Thomson die (Tomson type), or in the process of assembling the backlight unit. Damaged, or the problem of resin particles falling off

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0078] (Preparation of Light Diffusion Structure)

[0079] The light-diffusing structure of the present invention is obtained by laminating a light-diffusing agent obtained by dispersing inorganic particles in a resin binder on at least the surface (front) surface of a substrate as a light-diffusing layer. Here, the so-called surface (front) surface refers to the surface of the substrate on the side opposite to the light source. Moreover, haze can also be made large by laminating|stacking a light-diffusion layer on the back surface of a base material other than a surface (front) surface. The light diffusing agent preferably contains a solvent.

[0080] The light diffusing agent preferably mixes 0.1 to 200 parts by weight of inorganic particles with respect to 100 parts by weight of the resin binder. A more preferable compounding amount is 10 to 200 parts by weight, and the most preferable compounding amount is 100 to 200 parts by weight.

[0081] However, when laminating|st...

Embodiment

[0089] Hereinafter, the present invention will be described in more detail by way of examples. Measurement of various properties in the present invention was carried out by the following methods. Various measurements were performed at normal temperature (20 to 30° C.) and normal humidity (60% RH or less).

[0090] 1. Measurement method, device and evaluation method

[0091] (1) Transmission photometry

[0092] Device: Goniophotometer GP-200 (Murakami Color Technology Research Institute)

[0093] Method: Arrange the light source on the back side of the light diffusion structure, scan the light receiver in the range of 0 to 180° on the front side, and measure the amount of transmitted light every 0.1°. However, in the light diffusion structure, the angle at which the light source and the photoreceiver form symmetrical positions is set to 90°. When measuring, adjust the sensitivity of the photomultiplier tube so that the maximum transmitted light intensity is also below 85. ...

Synthetic example 1

[0115] Synthesis Example 1: Inorganic Particle A

[0116] Dissolve 160mol of aluminum sulfate and 0.2mol of sodium sulfate in 700L of ion-exchanged water, and then add 0.1mol of oxalic acid (H 2 C 2 o 4 ) and at 1m 3 Stirring in the reaction tank. Next, 633 mol of sodium hydroxide was added to the mixed solution while stirring at a rotation speed of the stirring blade of 89 rpm, and hydrothermal treatment was performed at 170° C. for 3 hours. After the cooled reaction solution was filtered and washed with water, it was dried at 120°C for 24 hours and pulverized to obtain Figure 4 Disc-shaped (chess-shaped) aluminum salt hydroxide particles (inorganic particles A) shown in the SEM photograph of . Each characteristic of the inorganic particle A is shown in Table 1.

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Abstract

The purpose of the present invention is providing a light-diffusing structure with low price, which has a high concealment ability and high solvent resistance, can obtain diffusing light with high brightness if combined with a light source, and is not easily charged. The light-diffusing structure of the present invention has a base material and a light-diffusing layer disposed thereon; the light-diffusing layer contains resin and inorganic particles. The structure is characterized in: the shapes of the inorganic particles include go chess piece shape, cylinder plate shape and hexagonal column plate shape; and the particle size distribution acutance (D75 / D25) satisfies: 1.0<=D75 / D25<=1.4.

Description

technical field [0001] The present invention relates to a light-diffusing structure provided with a light-diffusing layer (light-diffusing layer) excellent in acid resistance and organic solvent resistance. More specifically, it is related with the light-diffusion structure applicable to the backlight unit of a liquid crystal display device, a lighting fixture use, the screen of a projector, etc. Background technique [0002] The light diffusing structure is used to diffuse light from a point light source such as a light bulb or LED, or a line light source such as a fluorescent tube, to obtain uniform surface illumination with high front brightness. Such a light-diffusing structure is widely used in, for example, light-diffusing films for backlight units of liquid crystal displays such as mobile phones, digital cameras, and liquid crystal televisions, screens for liquid crystal projectors, and light diffusing for household lighting fixtures and facility lighting. Boards, ro...

Claims

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Application Information

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IPC IPC(8): G02B5/02G02F1/13357C08L33/00C08K5/00
CPCG02B5/0242G02F1/133504G02F1/133606
Inventor 王兴东佐藤孝俊根立浩一
Owner KYOWA CHEM IND
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