Electromagnetic-shielding light diffusion sheet

A technology of electromagnetic shielding and light diffusion, which is applied in the field of light diffusion plates, can solve the problems of inability to show electromagnetic shielding performance, darkening of liquid crystal displays, and decrease of total light transmittance, and achieve improved opacification characteristics and reduced linear expansion coefficient. The effect of small, elastic modulus increase

Inactive Publication Date: 2006-05-31
多喜兰株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, a light-diffusing sheet having an antistatic layer including a transparent resin adhesive and an electrolyte, such as the light-diffusing sheet described in Patent Document 1, cannot exhibit an electromagnetic Shielding performance, this is because the surface resistivity of the antistatic layer is 10 8 Ω / □ or higher
[0006] Also, as described in Patent Document 2, the technique of using a light-diffusing sheet and an electromagnetic shielding sheet is disadvantageous because not only the superimposition of the two sheets causes a decrease in the total light transmittance, causing problems such as dimming of a liquid crystal display, but also these Board bonding is troublesome

Method used

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Examples

Experimental program
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Effect test

example 1

[0127] The polypropylene used as a light diffusing agent is extrusion molded into a single-layer board with a thickness of 130 μm to form the main body of the light diffusing board. The polypropylene contains 30% talc particles by mass and has an average particle size of 7.2 μm. .

[0128] On the other hand, single-walled carbon nanotubes (synthesized by the method according to ChemicalPhysics Letters, 323 (2000) pages 580-585; diameter 1.3-1.8nm) as a dispersant and polyethylene oxide / polypropylene oxide copolymer are added Into a mixture of isopropanol / water (3:1 ratio) as the solvent. The components are uniformly mixed and dispersed. Thus, a coating liquid was prepared, which contained 0.003% and 0.05% by mass of single-walled carbon nanotubes and a dispersant, respectively.

[0129] The coating liquid is applied to one side of the light diffusion plate main body and dried. After that, a thermosetting urethane acrylate solution diluted to 1 / 600 with methyl isobutyl ketone was f...

example 2

[0138] An electromagnetic shielding light diffusion plate was formed in the same manner as in Example 1, except that the content of talc particles as a light diffusion agent was changed to 25% by mass. In the same manner as in Example 1, the total light transmittance, blurriness, brightness, arithmetic average roughness of the upper and lower sides, surface resistivity, and dot coverage of the light diffusion plate were checked. The results are shown in Table 1. Regarding the electromagnetic shielding properties of the light diffusion plate, inspection can be omitted because its surface resistivity is almost the same as in Example 1, and it is considered that the light diffusion plate has almost the same performance as the electromagnetic shielding light diffusion plate of Example 1.

example 3

[0140] Obtained in the same way as in Example 1 figure 2 The electromagnetic shielding light diffusion plate of the structure shown, except that the polypropylene containing 21% talc particles by mass is extruded into a plate with a thickness of 112 μm by using a three-layer co-extrusion molding machine, and at the same time, it does not contain talc particles. Co-extruded polypropylene with a thickness of 130 μm to form a light-diffusing plate body composed of a three-layer plate with a thickness of 130 μm, so that a 9 μm-thick polypropylene plate is stacked on the upper and lower sides of the aforementioned plate.

[0141] In the same manner as in Example 1, the total light transmittance, blurriness, brightness, arithmetic average roughness of the upper and lower sides, surface resistivity, and dot coverage of the light diffusion plate were checked. The results are shown in Table 1.

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Abstract

An electromagnetic-shielding light-diffusing plate having good electromagnetic-shielding performance and high light transmittance is disclosed. Light diffused from the electromagnetic-shielding light-diffusing plate is uniform and has little variation in brightness. The electromagnetic-shielding light-diffusing plate is characterized in that a light-transmitting conductive layer with a surface resistivity not exceeding 105Ω / □ is formed on at least one surface of the main body of the light-diffusing plate.

Description

Technical field [0001] The invention relates to a light diffusion plate with electromagnetic shielding function. Background technique [0002] Light diffusion plates are used in backlight units of liquid crystal displays, etc., and in lighting signs, covers of illuminators, etc., to diffuse light from point light sources or linear light sources, thereby obtaining uniform and high-brightness illumination. One of such light-diffusing plates is usually a light-transmitting synthetic resin plate having a plurality of fine recesses and protrusions formed on one side or each side, or a synthetic resin plate containing a light-diffusing agent (agent) . However, these plates have some problems in that they are easily electrostatically charged with dust particles attached to them, and cannot shield electromagnetic waves. [0003] In order to solve the problem about the adhesion of dust particles, the light diffusion plate that has been proposed includes a transparent resin plate with many...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02B32B7/02G02F1/13G02F1/13357
CPCG02B5/0221G02B5/0242G02B5/0278G02F1/133606Y10T428/162G02F1/133334
Inventor 伊藤秀己坂井将人濑宏一
Owner 多喜兰株式会社
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