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Polazied 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: 2003-04-09
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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Examples

Experimental program
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 dye bath was stirred with a water flow (2 m / sec). At this time, the water stream does not directly contact the PVA film. The transmittance / polarization degree of the obtained polarizing plate was 44.6% / 99.94%.

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

[0064] In a dark room, on a background light with an illuminance of 33000 Lux, the polarization axes of the two polarizers under evaluation are placed in an orthogonal state. When viewed from the front and oblique directions, confirm whether the line perpendicular to the polarization axis can be seen through visual inspection Streaks in the direction (stretching direction).

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

[0066] Peel off the upper and lower polarizing plates on the liquid crystal cell of the LCD monitor (300 cm) of a commercially available product, and use an adhesive to s...

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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 and a liquid crystal display, and the polarizing plate is used for a liquid crystal display (hereinafter referred to as "LCD") in which unevenness of display, particularly unevenness of dyeing, is improved. Background technique [0002] LCDs are used in personal computers, etc., and their usage has increased dramatically in recent years. LCD has a wide range of uses, and in recent years it has also been used in monitors. [0003] However, compared to the use of personal computers, LCDs for monitors have increased screen size and increased panel brightness (luminance). In addition, LCDs for monitors are not only used for individuals like personal computers, but also have more opportunities for viewing by multiple people. Since they are viewed not only from the front but also from an oblique direction, a display with a higher viewing angle is required. In addition, because the monitor requires a bright scree...

Claims

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Application Information

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IPC IPC(8): G02B5/30
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
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