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Laminate optical body, optical film, liquid crystal display device using said optical film, and method for manufacturing laminate optical body

An optical body and layering technology, applied in chemical instruments and methods, optics, optical components, etc., can solve problems such as O-plate deformation, difficult to achieve optical compensation, tilt alignment angle offset, etc., and achieve the effect of excellent manufacturing efficiency

Inactive Publication Date: 2012-01-11
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As with any other retardation film, it is extremely difficult to accurately represent the slow axis of the O plate on the TD of the raw film
In addition, in a laminate using a conventional polarizing plate and an O plate, for example, due to a dimensional change (such as shrinkage) of the polarizing plate in a high-temperature and high-humidity environment, the O plate is deformed, resulting in a shift in the angle of its oblique alignment.
As a result, it is difficult to achieve the desired optical compensation

Method used

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  • Laminate optical body, optical film, liquid crystal display device using said optical film, and method for manufacturing laminate optical body
  • Laminate optical body, optical film, liquid crystal display device using said optical film, and method for manufacturing laminate optical body
  • Laminate optical body, optical film, liquid crystal display device using said optical film, and method for manufacturing laminate optical body

Examples

Experimental program
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Effect test

Embodiment

[0175] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples. In addition, the measurement methods in the examples are as follows. In addition, in an Example, when showing the angle other than an inclination angle, let the longitudinal direction of a film be 0 degree, and let the direction which rotated counterclockwise from the longitudinal direction be positive.

[0176] (1) Dimensional change rate

[0177] The laminated optical bodies obtained in Examples and Comparative Examples were cut into 10 cm×10 cm and used as test pieces. Specific positions on the test piece are marked at specific intervals. The marked test piece was placed in an oven (manufactured by ESPEC, product name PH-201), left at 80°C for 500 hours, and then taken out. Measure the marking interval of the taken-out test piece, and calculate the dimensional change rate according to the following formula:

[0178] Dimensional change rate (%)...

reference example 1

[0202] [Production of Polarizing Film]

[0203] Polyvinyl alcohol resin (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., product name "Gohsenol NH-18", saponification degree: 98-99%) was dissolved in hot water and cooled to prepare 7 % by weight polyvinyl alcohol aqueous solution. On the other hand, a norbornene-based resin film (manufactured by JSR Corporation, product name "ARTON", thickness: 100 µm) was prepared as a base material. The above-mentioned aqueous solution was applied to the surface of the substrate, and dried at 100° C. for 10 minutes to form a polyvinyl alcohol film with a thickness of 7 μm on the substrate. The obtained substrate / film laminate was stretched in the short side direction at a stretching temperature of 140° C. and a stretching ratio of 4.5 times. The overall thickness of the stretched laminate was 60 μm, and the thickness of the polyvinyl alcohol film was 3 μm. The thus stretched laminate was immersed in an iodine aqueous solutio...

reference example 2

[0205] [Production of Polarizing Film]

[0206]A polyvinyl alcohol resin (manufactured by Nippon Synthetic Chemicals Co., Ltd., product name "Gohsenol NH-18", degree of saponification: 98 to 99%) was dissolved in hot water and cooled to prepare a 7% by weight aqueous solution of polyvinyl alcohol. On the other hand, a norbornene-based resin film (manufactured by JSR Co., Ltd., product name "ARTON", thickness: 100 μm) was prepared as a base material. The above-mentioned aqueous solution was applied to the surface of the substrate, and dried at 100° C. for 10 minutes to form a polyvinyl alcohol film with a thickness of 7 μm on the substrate. The obtained substrate / film laminate was stretched in the short side direction at a stretching temperature of 140° C. and a stretching ratio of 4.5 times. The overall thickness of the stretched laminate was 60 μm, and the thickness of the polyvinyl alcohol film was 3 μm. The laminate stretched in this way was immersed in an iodine aqueous ...

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Abstract

Disclosed is a laminate optical body with which a liquid crystal display device having excellent manufacturing efficiency, extremely little axial misalignment, and little display nonuniformity can be obtained. This laminate optical body is equipped with: an elongated polarizing film having an absorption axis in the short-side direction and containing a base material layer and a hydrophilic polymer layer to which a dichroic material is absorbed; and an elongated phase retardation film having a slow axis in the lengthwise direction. The polarizing film is a laminate body containing a base material layer and a hydrophilic polymer layer to which a dichroic material is absorbed. This laminate optical body is elongated. The thickness of the hydrophilic polymer layer preferably is 1-10 [mu]m.

Description

technical field [0001] The invention relates to a laminated optical body, an optical film, a liquid crystal display device using the optical film, and a method for manufacturing the laminated optical body. Background technique [0002] A liquid crystal display device includes a polarizing plate as a constituent element due to its display mechanism. As a polarizing plate, a polarizing plate product obtained by absorbing a polyvinyl alcohol (PVA)-based film with a dichroic substance and uniaxially stretching the resultant is currently widely used. Such a polarizing plate is produced by stretching a long PVA-based film in the longitudinal direction, so its absorption axis appears in the longitudinal direction. [0003] In addition, in liquid crystal display devices, in order to optically compensate the phase difference of the liquid crystal cell, in many cases, it is necessary to set a specific retardation film so that its slow axis absorbs the polarizer (actually the polarize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B7/02G02F1/1335G02F1/13363
CPCG02B5/3016G02B5/3033G02F1/133634B32B27/08B32B27/281B32B27/288B32B27/306B32B27/34B32B27/36B32B2307/412B32B2307/418B32B2307/42B32B2307/516B32B2307/728B32B2307/732B32B2457/202C09K2323/00Y10T428/265Y10T428/31504
Inventor 西村明宪柳沼宽教吉见裕之武田健太郎稻垣淳一木下亮儿喜多川丈治
Owner NITTO DENKO CORP
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