High contrast polarizer and liquid crystal display

A technology of liquid crystal display devices and polarizers, which is applied in the direction of lamination devices, polarizing elements, lamination, etc., can solve problems such as rising of liquid crystal display devices, and achieve the effect of improving the contrast of the screen

Active Publication Date: 2014-05-14
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, on the other hand, the actual situation is that the demand for the improvement of the contrast ratio of the liquid crystal display device is still rising, and it can be said that the breakthrough brought by the new insight of the above-mentioned improvement method is necessary.

Method used

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  • High contrast polarizer and liquid crystal display
  • High contrast polarizer and liquid crystal display
  • High contrast polarizer and liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] (production of polarizing film)

[0162] A polyvinyl alcohol film with an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% or more, and a thickness of 75 μm is uniaxially stretched in a dry state and stretched about 5 times, and then kept in a tense state, then dipped in 60°C After 1 minute in pure water, it was immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.1 / 5 / 100 at 28° C. for 60 seconds. Thereafter, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 10.5 / 7.5 / 100 at 72° C. for 300 seconds. Next, after washing with pure water at 10°C for 5 seconds, and then drying at 60°C for 75 seconds while maintaining a tension of 400 N, and then drying at 75°C for 30 seconds, an iodine-adsorbed and iodine-coated product with a moisture content of 10.9% was obtained. Oriented polarizing film.

[0163] (preparation of adhesive)

[0164] In addition...

Embodiment 2

[0168] (production of polarizing film)

[0169] A polarizing film having a moisture content of 13.9% was obtained in the same manner as in Example 1 except drying at 40° C. for 60 seconds and drying at 50° C. for 25 seconds.

[0170] (production of polarizer)

[0171] While maintaining the tension of the laminate at 430N / m, after 4 seconds have elapsed since lamination at room temperature, drying was performed continuously in this order at 60°C for 9 seconds, at 80°C for 113 seconds, and at 70°C for 75 seconds , except that, in the same manner as in Example 1, a polarizing plate was obtained.

Embodiment 3

[0173] (production of polarizing film)

[0174] A polarizing film having a moisture content of 13.9% was obtained in the same manner as in Example 1 except drying at 40° C. for 60 seconds and drying at 50° C. for 25 seconds.

[0175] (production of polarizer)

[0176] While maintaining the tension of the laminate at 430N / m, after 4 seconds have elapsed since lamination at room temperature, 9 seconds at 60°C, 39 seconds at 90°C, 74 seconds at 80°C, 70 A polarizing plate was obtained in the same manner as in Example 1 except for drying at °C for 75 seconds.

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Abstract

PURPOSE: A polarizing plate and a liquid crystal display device with high contrast are provided to improve contrast by applying a polarizer to a liquid crystal display having an emitting wavelength property. CONSTITUTION: A polarizer comprises a polarizing film. The polarizing film is formed by absorbing and growing a polyvinyl alcohol resin film with two color pigments. The cellulose acetate series region film is laminated on one side of the polarizing film through an adhesive film. A cycloolefin-based resin film is laminated on the other side of polarizing film through an adhesive film.

Description

technical field [0001] The present invention relates to a high-contrast liquid crystal display device with clear display and a polarizing plate used therein. Background technique [0002] A polarizing film is widely used as a film in which a dichroic dye is adsorbed on a polyvinyl alcohol-based resin film and the dichroic dye is oriented. In addition, an iodine-based polarizing film using iodine as a dichroic dye, a dye-based polarizing film using a dichroic direct dye as a dichroic dye, and the like are known. These polarizing films are usually made into polarizers by laminating a transparent protective film such as triacetyl cellulose or cycloolefin on one or both sides of the polarizing film with an adhesive formed from an aqueous solution of a polyvinyl alcohol-based resin. [0003] Polarizing plates are widely used as optical components for liquid crystal display devices. Liquid crystal display devices are expanding their market as display screens for liquid crystal t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335B32B23/08B32B37/12
CPCG02B6/0065G02F1/133528
Inventor 九内雄一朗武藤清前田智久
Owner SUMITOMO CHEM CO LTD
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