Polarizing plate and image display apparatus

一种偏振片、偏振器的技术，应用在偏振片领域，能够解决不太可能获得足够的紫外屏蔽能力、不能保持显示质量、紫外吸收剂渗出等问题，达到抑制不利现象的效果

Active Publication Date: 2011-05-11
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a film has a problem of bleeding of the ultraviolet absorber due to heating at high temperature or changes over time, and the adhesion between layers is reduced, which makes it impossible to maintain display quality
In addition, the organic ultraviolet absorber has a problem that it is unlikely to obtain sufficient ultraviolet shielding ability, and if the content of the organic ultraviolet absorber is increased, the transparency decreases

Method used

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  • Polarizing plate and image display apparatus
  • Polarizing plate and image display apparatus
  • Polarizing plate and image display apparatus

Examples

Experimental program
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preparation example Construction

[0039] In the production of polyurethane-based resins, other polyols and other chain extenders may also be reacted in addition to the above-mentioned components. Examples of other polyols include polyols having 3 or more hydroxyl groups such as sorbitol, 1,2,3,6-hexanetetrol, 1,4-sorbitol, 1,2,4-butanetriol, 1 , 2,5-pentanetriol, glycerin, trimethylolethane, trimethylolpropane and pentaerythritol. Examples of other chain extenders include: glycols such as ethylene glycol, diethylene glycol, triethylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, Pentylene glycol, 1,6-hexanediol, and propylene glycol; aliphatic diamines such as ethylenediamine, propylenediamine, hexamethylenediamine, 1,4-butylenediamine, and aminoethylethanolamine; aliphatic diamines amines such as isophoronediamine and 4,4'dicyclohexylmethanediamine; and aromatic diamines such as xylylenediamine and toluenediamine.

[0040] As a method for producing the polyurethane-based resin...

Embodiment 1

[0116] (Preparation of polarizer)

[0117] A polyvinyl alcohol film having a thickness of 75 μm was immersed in hot water at 28° C. for 60 seconds to be swollen. Next, the polyvinyl alcohol film was dipped in an aqueous solution containing iodine and potassium iodide (weight ratio 1:10), and dyed while being stretched to 3.3 times to obtain a predetermined uniaxial transmittance. Subsequently, the obtained polyvinyl alcohol film was immersed in an aqueous solution containing 3% by weight of boric acid and 2% by weight of potassium iodide for 10 seconds, and pulled in an aqueous solution containing 4% by weight of boric acid and 3% by weight of potassium iodide at 60°C. stretched so that the stretch ratio becomes 6.0 times in total. Subsequently, the obtained stretched film was dipped in an aqueous solution containing 5% by weight of potassium iodide for 10 seconds, and then dried in an oven at 40° C. for 3 minutes to obtain a polarizer having a thickness of 30 μm.

[0118] (...

Embodiment 2

[0133] A polarizing plate was prepared in the same manner as in Example 1 except that a No. 20 wire bar was used to coat the resin composition to form an ultraviolet shielding layer. The resulting ultraviolet shielding layer had a thickness of 3.0 μm.

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Abstract

A polarizing plate according to an embodiment of the present invention includes a polarizer, a UV-shielding layer containing an inorganic fine particle with a bandgap of 3.0 eV or more and a binder resin, and a protective film.

Description

technical field [0001] The present invention relates to polarizers. More specifically, the present invention relates to a polarizing plate having ultraviolet shielding ability. Background technique [0002] In a liquid crystal display device which is a typical image display device, it is known to place polarizing plates on both sides of the liquid crystal cell due to the image forming system of the liquid crystal cell. A polarizing plate is generally formed by attaching a protective film on both surfaces of a polarizer with an adhesive. As a protective film, typically, a cellulose-based resin film is used. [0003] The liquid crystal molecules of polarizers and liquid crystal cells are degraded by ultraviolet light from sunlight or backlight. In order to prevent the degradation, a cellulose-based resin film containing an organic ultraviolet absorber has been suggested (for example, Japanese Patent Application Laid-Open No. 2007-3788). However, such a film has a problem o...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G02B5/30G02B1/10B32B27/04C08L33/00G02B5/22G02F1/1335
CPCG02B5/3033C08L33/14G02B5/208G02B5/22C08L25/12
Inventor长濑纯一方滨梅本清司
OwnerNITTO DENKO CORP