Prism sheet, and backlight unit and liquid crystal display device using prism sheet

A liquid crystal display device and prism sheet technology, applied in prisms, optical elements, lighting devices, etc., can solve the problems that the light diffusion layer cannot be found and has not been disclosed, and achieves suppression of moiré fringes, reduction of light loss, and high brightness Effect

Inactive Publication Date: 2010-08-04
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, light-diffusing films and light-diffusing sheets are intended to improve the light-diffusing function by using porous particles, but their basic functions and forms are not fundamentally different from conventional light-diffusing films and sheets.
Utilizing the inherent characteristics of the light-diffusing layer with porous particles, it is impossible to find a function that has not been found before, and it is not disclosed at all that it can suppress moiré fringes in combination with a prism sheet.

Method used

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  • Prism sheet, and backlight unit and liquid crystal display device using prism sheet
  • Prism sheet, and backlight unit and liquid crystal display device using prism sheet
  • Prism sheet, and backlight unit and liquid crystal display device using prism sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 Embodiment 2 comparative example 1～7

[0141] Preparation process of coating material (i) for diffusion layer

[0142] 330 parts by mass of toluene

[0143] 90 parts by mass of cyclohexanone

[0144] Acrylic microparticles 'MX-500' 50 parts by mass

[0145] Acrylic resin solution 'Acrydic WDU-938' 330 parts by mass

[0146] Antistatic agent ‘Nopcostat SN A-2’ 10 parts by mass

[0147] Polyisocyanate solution 'Coronet HL' 45 parts by mass

[0148] The above components were mixed with a disperser to obtain a coating (i) for a diffusion layer. At this time, the added amount of the resin particles to the solid content of the resin binder was 25% (mass ratio).

[0149] Coating, drying and curing process on the substrate

[0150] As a substrate, a polyethylene terephthalate (PET) film with a thickness of 38 μm was used. The ultraviolet curable resin composition was heated to about 80° C. to lower its viscosity, and was applied to one surface of the substrate with a thickness of 30 μm by extrusion coating. As ...

Embodiment 3～5

[0176] The relationship between the particle size of porous particles and the film thickness of the light-diffusing layer

[0177] In order to investigate the relationship between the volume average particle diameter of the porous particles and the film thickness of the light diffusion layer, the following paint for the diffusion layer was produced.

[0178] Preparation process of coating material (j) for diffusion layer

[0179] 280 parts by mass of toluene

[0180] 80 parts by mass of cyclohexanone

[0181] Amorphous porous silica 'Sylysia430' 30 parts by mass

[0182] [Average pore diameter: 17nm, micropore volume: 1.25ml / g,

[0183] Average particle diameter (measured by laser method): 4.1 μm, manufactured by Fuji Silysia Chemical Industry Co., Ltd.]

[0184] Acrylic resin solution 'Acrydic WDU-938' 330 parts by mass

[0185] [Solid content 50%, manufactured by DIC Corporation]

[0186] Antistatic agent ‘Nopcostat SN A-2’ 2 parts by mass

[0187] [imidazoline ty...

Embodiment 6 Embodiment 7

[0197] Comparison of Spherical Porous Particles and Amorphous Porous Particles

[0198] In order to compare amorphous porous particles and spherical porous particles, a coating material for a diffusion layer using the following spherical porous particles was prepared.

[0199] Preparation process of coating material (k) for diffusion layer

[0200] 250 parts by mass of toluene

[0201] Cyclohexanone 72 parts by mass

[0202] Spherical porous silica 'Sylosphere C-1504' 27 parts by mass

[0203] [Pore volume: 1.5 ml / g, average particle size (measured by laser method): 4 μm, manufactured by Fuji Silysia Chemical Industry Co., Ltd.]

[0204] Acrylic resin solution 'Acrydic WD U-938' 300 parts by mass

[0205] Antistatic agent ‘Nopcostat SN A-2’ 2 parts by mass

[0206] Polyisocyanate solution 'Coronet HL' 40 parts by mass

[0207] The above components were stirred and mixed with a disperser to obtain a coating (k) for a diffusion layer. At this time, the added amount of...

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Abstract

Provided is a prism sheet which has high effects of suppressing moire fringes, high front brightness and reduced number of components when it is used as a prism sheet for a backlight unit for a liquid crystal display device. The prism sheet has a prism row having ridges formed parallel to each other at equivalent intervals on one surface and a light diffusion layer containing porous particles on the other surface. The prism sheet preferably has the prism row on one surface and the light diffusion layer on the other surface by having a light transmitting sheet in between.

Description

technical field [0001] The present invention relates to a prism sheet usable as a component of a backlight unit of a liquid crystal display device (LCD) or the like. Background technique [0002] In a liquid crystal display device equipped in a computer, a mobile phone, a digital camera, etc., a backlight unit is incorporated as a device for illuminating the liquid crystal display surface from the back side. figure 1 An example of a general configuration of a liquid crystal display device is shown. In the conventional backlight unit 2, light emitted from a light source 3 such as a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED) is reflected by a reflection sheet 6 or the like, and the light is made incident on a light guide plate 5, so that The light emitted from the upper surface of the light guide plate 5 is converged in the front direction by the light diffusion film (lower diffusion film) 7 . The outgoing light from the light diffusion film (lower ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02F21V5/00F21V5/02F21V8/00G02B5/04G02F1/13357F21Y103/00
CPCG02F1/133615G02B6/0053G02B6/0051
Inventor 宫本雅史高岛正直嵯峨隆一
Owner DIC CORP
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