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Polarizing plate and TN-type liquid crystal display including the same

A technology of polarizers and polarizers, applied in polarizing components, instruments, optics, etc., can solve the problems of reducing moisture absorption, uneven brightness, etc., and achieve the effect of reducing light leakage

Active Publication Date: 2013-01-23
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is believed that this phase difference leads to brightness non-uniformity, therefore, a solution to this problem requires reducing moisture absorption through the polarizer

Method used

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  • Polarizing plate and TN-type liquid crystal display including the same
  • Polarizing plate and TN-type liquid crystal display including the same
  • Polarizing plate and TN-type liquid crystal display including the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0120] Preparation method of polarizer

[0121] An exemplary method for producing a polarizing plate includes laminating a long polarizer, a retardation film, and a protective film in its longitudinal direction to form a multilayered product and cutting the multilayered product into a rectangle having each side at an angle to the longitudinal direction. in the direction of 45°. Since long polarizers generally have an absorption axis along their longitudinal direction, cutting a multilayer product at 45° to the longitudinal direction can easily form each with a long or short side at 45° to the absorption axis of the polarizer. polarizer. Since a long film generally has an in-plane slow axis in a direction parallel or perpendicular to its longitudinal axis, a retardation film also has an in-plane slow axis in a direction at 45° to the long or short side of the polarizer.

[0122] Difference in dimensional change between polarizer and retardation film

[0123] To reduce the di...

Embodiment

[0141] The present invention is further explained in the following paragraphs, which will further specifically describe the features of the present invention with reference to Examples and Comparative Examples. Any materials, usage amounts, ratios, processing details, processing procedures and the like shown in the examples can be appropriately modified without departing from the scope of the present invention. Therefore, it should be understood that the scope of the present invention should not be interpreted in a limited manner based on the specific examples shown below.

[0142] Preparation of retardation film A

[0143] Retardation films were prepared using cellulose acylate having the degrees of substitution shown in Table 2 and additives under the stretching conditions shown in Table 2.

[0144] Preparation of Fine Particle Dispersions

[0145] The following components were stirred to mix to prepare a fine particle dispersion.

[0146]Fine grain {AEROSIL R972V (manufa...

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Abstract

The object of the present invention is to reduce the occurrence of the light leaks from the periphery of the display flame at the originally black display time in high-temperature environments. Disclosed is a polarizing plate comprising a polarizer, a protective film on a side of the polarizer and a retardation film on the other side of the polarizer; wherein the polarizer has an absorption axis at 45 DEG from any one of the long and short sides of the polarizing plate, the retardation film has an in-plane slow axis parallel or orthogonal to the absorption axis of the polarizer, and a difference [Delta][epsilon]'abs in a dimensional change between the polarizing plate and the retardation film in the absorption axis direction of the polarizer satisfies the formula: |[Delta][epsilon]'abs|<=0.10%.

Description

technical field [0001] The present invention relates to a polarizer for a liquid crystal display, especially a TN type liquid crystal display, and a TN type liquid crystal display comprising the polarizer. In particular, the present invention relates to a technique for reducing light leakage occurring from the periphery of a display frame at the time of original black display of a liquid crystal display under a high temperature environment. Background technique [0002] Various types of liquid crystal displays, such as twisted nematic (TN) type, vertical alignment (VA) type, and in-plane switching (IPS) type liquid crystal displays, have been widely used in monitors of personal computers (PCs) and televisions . In order to provide a wide viewing angle in each type, various techniques have been proposed which use retardation films having different optical characteristics as viewing angle compensation films. [0003] In general, a polarizer for a liquid crystal display inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02F1/133528G02F2413/08G02F1/1335G02F2203/60G02B5/3083G02B5/3033G02F2001/133531G02F1/13363G02B5/30G02B1/105G02B1/14G02F1/133531G02F2201/54
Inventor 新福千枝井上力夫
Owner FUJIFILM CORP