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Laminated film and image display device

A laminated film and polarizing film technology, applied to layered products, synthetic resin layered products, instruments, etc., can solve problems such as warping, low durability, cracks, etc., and achieve white brightness, high white brightness, and optical reliability sex high effect

Active Publication Date: 2022-05-03
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 of low durability under high temperature and high humidity, resulting in warpage and cracks

Method used

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  • Laminated film and image display device

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

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

[0132] A laminate with a 9 μm thick PVA layer formed on an amorphous PET substrate was assisted by 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 an aqueous solution having a concentration of 0.3% of potassium iodide (weight ratio = 0.5 / 8), a colored laminate is formed, and the colored laminate is further stretched in an aqueous solution of boric acid at a stretching temperature of 65° C. so that the total stretching ratio reaches 5.94 times, thereby An optical film laminate including a 5 μm thick PVA layer stretched integrally with the amorphous PET substrate was formed. An optical film laminate comprising a PVA layer (polarizer) (1) with a thickness of 5 μm constituting a highly functional polarizing film was formed. The high-order orientation of the PVA molecules of the PVA la...

manufacture example 2

[0133] Production example 2 (manufacture of a polarizer (2) with a thickness of 5 μm)

[0134]An optical film laminate including a PVA layer (polarizer) (2) with a thickness of 5 µm was formed in the same manner as in Production Example 1 except that the concentration of iodine / potassium iodide (weight ratio = 0.5 / 8) was changed to 0.2%. 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] Production example 3 (manufacture of a polarizer (3) with a thickness of 5 μm)

[0136] Except having changed the density|concentration of iodine / potassium iodide (weight ratio=0.5 / 8) into 0.23%, it carried out similarly to Production Example 1, and formed the optical film laminated body containing the PVA layer (polarizer) (3) of thickness 5 micrometers. 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 relates to a laminated film comprising an adhesive layer, a polarizing film, and a brightness improving film in this order, the polarizing film having a protective film on at least one side of a polarizer containing a polyvinyl alcohol-based resin, and the polarizer having a protective film on one side. A thickness of 10 μm or less, a single transmittance of 43.0% or more, a degree of polarization of the brightness improving film of 90% or more, a thickness of the protective film of 25 μm or less, and a moisture permeability of 200 g / (m 2 · days) or less. Even when a polarizer having a thickness of 10 μm or less is used in the laminated film of the present invention, the white luminance can be improved, and the occurrence of display unevenness after the humidification test can be suppressed.

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 used for image display. For example, in a liquid crystal display (LCD), it is essential to arrange polarizing films on both sides of a glass substrate forming the surface of a liquid crystal panel in view of its image forming method. As such a polarizing film, a polarizing film obtained by bonding a protective film to one or both surfaces of a polarizer made of a polyvinyl alcohol film and a dichroic material such as iodine with a polyvinyl alcohol adhesive or the like is generally used. [0003] In recent years, in image display devices such as liquid crystal display devices, there has been a strong demand for reduction in weight and thickness, and for various optical members such as polarizing films used in image display devices, there has also been a strong d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B32B27/08G02F1/1335B32B7/12B32B27/30B32B27/36B32B7/023
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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