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Multilayer film and image display device

A laminated film and polarizing film technology, applied in the direction of layered products, synthetic resin layered products, electronic equipment, etc., can solve problems such as cracks, low durability, warping, etc., achieve high white brightness, improve white brightness, optical The effect of high reliability

Active Publication Date: 2019-01-04
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, thin polarizing films have problems in that they have low durability under high temperature and high humidity, resulting in warpage and cracks

Method used

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  • Multilayer film and image display device

Examples

Experimental program
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Effect test

manufacture example 1

[0131] Production Example 1 (Production of polarizer (1) with a thickness of 5μm)

[0132] A laminate having a 9μm thick PVA layer formed on an amorphous PET substrate was subjected to auxiliary stretching in a gas atmosphere at a stretching temperature of 130°C to form a stretched laminate, and then the stretched laminate was immersed in iodine / In a 0.3% aqueous solution of potassium iodide (weight ratio = 0.5 / 8), a colored laminate is formed, and the colored laminate is further stretched in an aqueous boric acid solution at a stretching temperature of 65°C to achieve a total stretching ratio of 5.94 times. An optical film laminate including a PVA layer having a thickness of 5 μm, which was stretched integrally with an amorphous PET substrate, was formed. An optical film laminate including a PVA layer (polarizer) (1) with a thickness of 5 μm, which constitutes a highly functional polarizing film, is formed. The optical film laminate is formed on an amorphous PET substrate by su...

manufacture example 2

[0133] Production Example 2 (Production of Polarizer (2) with a thickness of 5μm)

[0134] Except that the concentration of iodine / potassium iodide (weight ratio=0.5 / 8) was changed to 0.2%, an optical film laminate including a PVA layer (polarizer) (2) having a thickness of 5 μm was formed in the same manner as in Production Example 1. The transmittance of the PVA layer of the obtained optical film laminate was 44.0%, and the boric acid content was 23% by weight.

manufacture example 3

[0135] Manufacturing example 3 (manufacturing of polarizer (3) with a thickness of 5μm)

[0136] Except that the concentration of iodine / potassium iodide (weight ratio=0.5 / 8) was changed to 0.23%, an optical film laminate including a PVA layer (polarizer) (3) having a thickness of 5 μm was formed in the same manner as in Production Example 1. The transmittance of the PVA layer of the obtained optical film laminate was 43.7%, and the boric acid content was 23% by weight.

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Abstract

The present invention is a multilayer film which sequentially comprises an adhesive layer, a polarizing film and a luminance improving film in this order, and which is configured such that: the polarizing film has a protective film on at least one surface of a polarizer that contains a polyvinyl alcohol resin; the polarizer has a thickness of 10 [mu]m or less and a single transmittance of 43.0% ormore; the luminance improving film has a degree of polarization of 90% or more; and the protective film has a thickness of 25 [mu]m or less and a water vapor permeability of 200 g / (m2.day) or less. Amultilayer film according to the present invention is able to improve the white luminance and to suppress the occurrence of display unevenness after a humidification test even in cases where a polarizer having a thickness of 10 [mu]m or less is used.

Description

Technical field [0001] The present invention relates to a laminated film and an image display device including the laminated film. Background technique [0002] In various image display devices, polarizing films are mainly used for image display. For example, for a liquid crystal display device (LCD), it is indispensable to arrange polarizing films on both sides of a glass substrate forming the surface of a liquid crystal panel in terms of its image forming method. As such a polarizing film, a polarizing film formed by bonding a protective film on one or both sides of a polarizer made of a polyvinyl alcohol-based film and a dichroic material such as iodine with a polyvinyl alcohol-based adhesive or the like is generally used. [0003] In recent years, in image display devices such as liquid crystal display devices, there is a strong demand for weight reduction and thinning. For various optical components such as polarizing films used in image display devices, thinning and weight r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B7/02B32B27/30G02F1/1335
CPCB32B27/30G02F1/1335G02B5/30B32B7/12B32B27/08B32B27/306B32B27/36B32B2307/518B32B2307/42B32B2457/202
Inventor 竹田哲郎鲭江岬吉村和也北村吉绍新保史枝
Owner NITTO DENKO CORP
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