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Polarizing plate and liquid crystal display device

A technology for polarizers and polarizers, applied in the fields of polarizers and liquid crystal display devices, can solve the problems of reduced display quality, uneven display, light leakage, etc., and achieve the effect of suppressing uneven display and excellent display quality

Active Publication Date: 2018-11-06
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a problem that display quality is lowered due to display unevenness and light leakage caused by the deformation and peeling

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] (production of polarizer)

[0110]A polyvinyl alcohol film with a thickness of 20 μm (the average degree of polymerization is about 2400, and the degree of saponification is 99.9 mol%) is uniaxially stretched 5 times by dry stretching, and then, while maintaining the stretched state, the film is heated at 60°C. After immersing for 1 minute in pure water of iodine / potassium iodide / water with a weight ratio of iodine / potassium iodide / water of 0.05 / 5 / 100 in an aqueous solution 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 8.5 / 8.5 / 100 at 72° C. for 300 seconds. Next, it was washed with pure water at 26° C. for 20 seconds, and then dried at 65° C. to obtain an absorption-type polarizing film having a thickness of 7 μm in which iodine was adsorbed and oriented on the polyvinyl alcohol film.

[0111] Next, a water-based adhesive (which is obtained by dissolving 3 parts of carboxy-modi...

Embodiment 2

[0114] On the triacetyl cellulose film (first protective film) of the polarizing plate obtained in Example 1, a commercially available acrylic adhesive sheet with an adhesive layer thickness of 5 μm was laminated, and the A reflective polarizing film with a thickness of 26 μm (trade name “Advanced Polarized Film, Version 3 (APF-V3)” purchased from 3M Company) was used as the first protective film. Except having used the said laminated body as a polarizing plate, the water contact angle and dimensional change rate were measured similarly to Example 1, and the visual recognition test of display unevenness was performed.

Embodiment 3

[0116] A polyvinyl alcohol film with a thickness of 30 μm (average degree of polymerization is about 2400, saponification degree is 99.9 mol % or more) is uniaxially stretched about 5 times by dry stretching, and then under the condition of maintaining tension, the polyvinyl alcohol film is stretched at 60 After immersing in pure water at °C for 1 minute, it was immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.05 / 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 8.5 / 8.5 / 100 at 72° C. for 300 seconds. Next, it was washed with pure water at 26° C. for 20 seconds, and then dried at 65° C. to obtain an absorption-type polarizing film having a thickness of 12 μm in which iodine was adsorbed and oriented on the polyvinyl alcohol film.

[0117] A triacetyl cellulose film [trade name "KC2UAW" purchased from KONICA MINOLTA Co., Ltd.] with a thickness o...

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Abstract

The invention provides a polarizing film and a liquid crystal display apparatus. The invention is to provide a polarizing film having no uneven display and light leakage and a liquid crystal display apparatus containing the polarizing film. A light source side of the polarizing film is provided with a polarizing film having a first protection film; the thickness of a polarizer is below 15 [mu]m; a water contact angle of the surface of the light source side of the polarizing film is under 100 degrees; heat treatment is conducted at the temperature of 85 DEG C for 100 hours, a size changing rate (S) of the polarizing film defined by the following formula is that -1.4=<S=<0.0; and S =(a size after heat treatment-a size before the heat treatment)x100 / the size before the heat treatment.

Description

technical field [0001] The invention relates to a polarizer on the light source side and a liquid crystal display device. Background technique [0002] In recent years, the slimming (thinning of the entire module) of mobile terminals such as smartphones has been rapidly progressing in terms of design and portability. Naturally, the polarizing plate used therein is also required to be thinner and lighter. [0003] In addition, the narrower frame of the screen is also progressing, and the light-shielding double-sided tape (backlight tape) for bonding the polarizer on the light source side to the backlight is also narrowing in width. [0004] When the module is heated, if the adhesive force between the backlight tape and the polarizer is not sufficient, the backlight tape cannot bear the shrinkage of the polarizer and the backlight tape has a narrow width as mentioned above. Deformation, peeling off. There is a problem that display quality is lowered due to display unevennes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/13357
CPCG02B5/3041G02F1/133606
Inventor 村野耕太
Owner SUMITOMO CHEM CO LTD
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