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Polarized plate and its producing method and liquid crystal display

A manufacturing method and polarizing plate technology, which can be used in optics, instruments, polarizing elements, etc., and can solve problems such as uneven display

Inactive Publication Date: 2009-05-20
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned existing problems, and to provide a method for manufacturing a polarizing plate, a polarizing plate, and a liquid crystal display for improving LCD display unevenness due to uneven dyeing.

Method used

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  • Polarized plate and its producing method and liquid crystal display

Examples

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Comparison scheme
Effect test

Embodiment 1

[0062] A polarizing plate was manufactured in the same manner as in Comparative Example 1 except for the case where the dyeing bath was stirred with a water flow (2 m / sec). At this time, the water flow does not directly contact the PVA film. The transmittance / polarization degree of the obtained polarizing plate was 44.6% / 99.94%.

[0063] (Evaluation method 1 of spots of polarizing plate)

[0064] In a dark room, on a background light with an illuminance of 33000Lux, make the polarization axes of the two polarizers to be evaluated perpendicular to each other, and observe from the front and oblique directions to confirm whether the direction perpendicular to the polarization axis can be seen through visual recognition. Striped spots in the direction (stretching direction).

[0065] (Evaluation method 2 of spots of polarizing plate)

[0066] Peel off the upper and lower polarizers attached to the liquid crystal cell of a commercially available LCD monitor (300 cann), and stick...

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Abstract

A polarized light sheet can be used to improve LCD of nonuniform display caused by nonuniform dyeing. The dyeing bath with concentration of iodine or the dichroic dyestuff bigger than 0.02 wt.% should be used to control its temperature in the range of 15-50 degrees C and to control the stretching multiplying power less than 5 times as well as agitating the bath solution while dyeing, when the polyvinyl alcohol film is under the dyeing course.

Description

technical field [0001] The present invention relates to a polarizing plate for a liquid crystal display (hereinafter simply referred to as "LCD") in which display unevenness, particularly dyeing unevenness, is improved, and a liquid crystal display. Background technique [0002] LCDs are used in personal computers and the like, and their usage has increased dramatically in recent years. LCDs are widely used, and in recent years they are also used in monitors. [0003] However, LCDs for monitors have larger screen sizes and larger luminance (brightness) of panels than those used for personal computers. In addition, LCDs for monitors are not only used for individuals like personal computers, but also have many opportunities for viewing by multiple people. Since they are viewed not only from the front, but also from oblique directions, a display with a higher viewing angle is required. In addition, since a bright screen is required for a monitor, a type in which the backlight...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335
Inventor 滨本英二杉野洋一郎土本一喜近藤千里楠本诚一
Owner NITTO DENKO CORP