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Foam sheet, light reflection plate and backlight panel using same

A foam sheet, light reflection technology, applied in the fields of foam sheet, light reflection board and backlight panel, can solve the problem of uneven brightness

Active Publication Date: 2016-08-17
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for this is that if the light reflection plate and the light guide plate are in close contact, local bright parts called white spots will appear, which may cause unevenness in brightness.

Method used

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  • Foam sheet, light reflection plate and backlight panel using same
  • Foam sheet, light reflection plate and backlight panel using same
  • Foam sheet, light reflection plate and backlight panel using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Make it as follows figure 1 A foam sheet (10) of the shape shown.

[0110] 2 parts by mass of polyester elastomer (grade: PRIMALLOY B1942N, manufactured by Mitsubishi Chemical) was added to 100 parts by mass of polyethylene terephthalate (grade: RT553C, manufactured by Unipet Japan, ρs=1.34) and mixed. This material is used as an intermediate layer for forming a foamed layer, and then made of polybutylene terephthalate (grade: NOVADURAN5026, manufactured by Mitsubishi Engineering Plastics, ρs=1.31) on both sides thereof. A resin sheet (20) with a three-layer structure of the surface layer. One side of the resin sheet was embossed to form concavities and convexities, and then a separator of olefin-based nonwoven fabric was stacked and wound to form a roll. When the arithmetic average roughness Ra of the said uneven|corrugated surface of this resin sheet was measured, it was 6.1 micrometers. In addition, the RSm of the uneven surface was 320 μm.

[0111] Thereafter, ...

Embodiment 2

[0114] The composition of the surface layer of Example 1 was changed to 80 parts by mass of polybutylene terephthalate with respect to 20 parts by mass of polyethylene terephthalate. A foam sheet was produced in the same manner. The obtained foam sheet had a thickness of 0.76 mm, a specific gravity of 0.55, and an average cell diameter of 1.0 μm. When the arithmetic mean roughness Ra of the uneven surface of this foam seat|seet was measured, it was 4.7 micrometers, and RSm was 450 micrometers. Moreover, the light reflectance of this foam seat|seet is 98 % or more.

[0115] Furthermore, white spot resistance was evaluated by using the obtained foam seat|seet as the light reflection plate of a backlight panel similarly to the above, and it was a pass.

Embodiment 3

[0117] The composition of the surface layer of Example 1 was changed to 65 parts by mass of polybutylene terephthalate with respect to 35 parts by mass of polyethylene terephthalate. A foam sheet was produced in the same manner. The obtained foam sheet had a thickness of 0.76 mm, a specific gravity of 0.55, and an average cell diameter of 1.0 μm. When the arithmetic mean roughness Ra of the uneven surface of this foam seat|seet was measured, it was 4.2 micrometers, and RSm was 500 micrometers. Moreover, the light reflectance of this foam seat|seet is 98 % or more.

[0118] Furthermore, white spot resistance was evaluated by using the obtained foam seat|seet as the light reflection plate of a backlight panel similarly to the above, and it was a pass.

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Abstract

The present invention is a foamed sheet, which is a foamed sheet with at least two layers of structure made of thermoplastic polyester resin, wherein the foamed sheet has at least one foamed layer and at least one non-foamed layer, And at least one layer of the non-foamed layer constitutes the surface layer of the foamed sheet; in the non-foamed layer, it contains more than 50 parts by mass and less than 100 parts by mass of A thermoplastic polyester resin (B) different from the thermoplastic polyester resin (A) constituting the foamed layer; an arithmetic average roughness Ra of 3.5 μm or more is formed on the exposed surface of at least one layer of the non-foamed layer constituting the surface layer bump.

Description

technical field [0001] The invention relates to a foam sheet, a light reflection plate and a backlight panel using the foam sheet. Background technique [0002] In a liquid crystal display device or the like, a backlight panel that irradiates light from the back side of a liquid crystal layer is used. As the backlight panel, the number of light sources can be reduced, thereby increasing the adoption of the side light method that is beneficial to energy saving. like image 3 As shown, in the edge-lit backlight panel (30), a light reflection plate (32) is arranged adjacent to the light guide plate (31). Through this light reflection plate, the light introduced into the light guide plate from the light source (34) and leaked to the light reflection plate side is returned to the liquid crystal layer side, so the outgoing light from the light source (34) can be efficiently emitted to the liquid crystal layer side, Therefore, the brightness of the liquid crystal display device c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/08B32B5/18B32B27/36F21V7/22G02B5/02G02F1/13357
CPCB32B3/30B32B5/18B32B27/065B32B27/36B32B2266/0264B32B2457/202G02B5/0247G02B5/0284G02B6/0051G02B6/0055B32B27/30
Inventor 伊仓幸广池田英行稻森康次郎森田修幸芳谷勉野村伸吾村上彰启
Owner FURUKAWA ELECTRIC CO LTD
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