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Polarizing plate and liquid crystal display device

A technology of polarizers and liquid crystal units, applied in the direction of polarizing elements, chemical instruments and methods, instruments, etc., can solve the problems of image unevenness, uneven bending, etc.

Active Publication Date: 2021-09-28
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] On the other hand, as liquid crystal display devices used as large TVs become thinner, when the glass substrate of the liquid crystal cell becomes thinner, the polarizing plate on the viewing side of the liquid crystal cell is bent due to a dimensional change due to water absorption (bending deformation), Along with this, warpage of the liquid crystal cell and image unevenness (warping unevenness) caused by the warpage occur

Method used

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  • Polarizing plate and liquid crystal display device
  • Polarizing plate and liquid crystal display device
  • Polarizing plate and liquid crystal display device

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preparation example Construction

[0388] The method for preparing the composition for forming a hard coat layer is not particularly limited as long as the constituent components can be uniformly mixed, for example, a known device such as a paint shaker, a bead mill, a kneader, or a mixer can be used for mixing. Or it can be prepared by dissolving each constituent.

[0389] In addition, there are no particular limitations on the method of coating the composition for forming a hard coat layer on the first protective film, and examples thereof include spin coating, dipping, spraying, die coating, bar coating, and roll coating. Known wet coating methods such as a coating method, a meniscus coating method, a flexographic printing method, a screen printing method, and a liquid coating method (Pierdo Coater method).

[0390] [Physical properties of the first protective film]

[0391] The retardation Ro in the in-plane direction of the first protective film may be 350 nm or less. In addition, the retardation Rt in t...

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Abstract

A polarizing plate (5) is formed by laminating a first protective film (optical film (12)), a polarizer (11), and a second protective film (optical film (13)) in this order. The retardation value Ro in the in-plane direction and the retardation value Rt in the thickness direction of the second protective film are within predetermined ranges. The difference between the Y.I value indicating the yellowness index of the first protective film and the Y.I value indicating the yellowness index of the second protective film is 0.4 or less. Only the second protective film contains a warp inhibitor that has an ultraviolet absorbing function and that suppresses warping caused by water absorption by converting absorbed ultraviolet rays into heat.

Description

technical field [0001] The present invention relates to a polarizing plate and an IPS (In Plane Switching: in-plane switching) type liquid crystal display device including the polarizing plate. Background technique [0002] Conventionally, as a technique for improving display unevenness of a liquid crystal display device, there is a technique disclosed in Patent Document 1, for example. In Patent Document 1, when an optical film is used for a thin liquid crystal display device (such as an IPS type liquid crystal display device), circular or elliptical optical unevenness occurs on the display surface, by using an aliphatic dicarboxylic acid Condensation ester with aliphatic diol is used as a plasticizer, and the above-mentioned plasticizer is contained at 10% by mass or more relative to the polymer (preferably cellulose acylate) forming the optical film, thereby improving the above-mentioned optical unevenness . [0003] On the other hand, as liquid crystal display devices ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B32B7/023B32B23/08G02F1/1335
CPCB32B7/02B32B23/08G02B5/30G02F1/1335G02B1/14
Inventor 金子由纪南条崇
Owner KONICA MINOLTA INC