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Polarizer, polarizing plate, and image display device

一种图像显示装置、偏振片的技术，应用在偏振元件、光学、光学元件等方向，能够解决偏振片出现裂纹等问题

Pending Publication Date: 2021-12-31
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The non-polarizing portion is typically formed by subjecting the polarizing plate to a drilling process, but there are problems such as cracks in the polarizing plate during processing

Method used

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  • Polarizer, polarizing plate, and image display device
  • Polarizer, polarizing plate, and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] (manufacture of laminated body)

[0082] An amorphous isophthalic acid-copolymerized polyethylene terephthalate (IPA-copolymerized PET) film (thickness: 100 μm) having a long shape with a water absorption of 0.75% and a Tg of 75° C. was used as the resin base material.

[0083] One surface of the resin substrate was subjected to corona treatment. Polyvinyl alcohol (polymerization degree: 4,200, saponification degree: 99.2mol%) and acetoacetyl-modified PVA (polymerization degree: 1,200, acetoacetyl modification degree: 4.6%, saponification degree : 99.0 mol% or more, manufactured by The Nippon Synthetic Chemical Industry Co., Ltd., trade name: "GOHSEFIMER Z-200"), was applied to the corona-treated surface at 25°C and dried to form a PVA-based resin layer. Thus, a laminated body was manufactured.

[0084] (manufacture of polarizing plate)

[0085] The obtained laminate was subjected to free-end uniaxial stretching (assisted stretching in air) at a stretch ratio of 2....

Embodiment 2

[0095] A polarizing plate having a transparent portion was obtained in the same manner as in Example 1 except that immersion in 0.1N hydrochloric acid for 30 seconds (acid treatment) was performed after the alkali treatment.

Embodiment 3

[0097] (manufacture of polarizing plate)

[0098]A PVA film (manufactured by Kuraray Co., Ltd., VF-PE #6000) having a thickness of 75 μm was stretched at a draw ratio of 2.0 times while being immersed in an aqueous solution at 30° C. for 30 seconds (swelling treatment).

[0099] Next, the PVA film was stretched at a stretching ratio of up to 3.0 times while being immersed in a dyeing bath having a liquid temperature of 30° C. (dyeing treatment). In the dyeing treatment, the iodine concentration and immersion time were adjusted so that the obtained polarizing plate had a prescribed transmittance. In this example, the film was dyed by dipping for 60 seconds in an aqueous solution of iodine obtained by compounding 100 parts by weight of water with 0.05 parts by weight of iodine and 0.3 parts by weight of potassium iodide.

[0100] Next, the PVA film was immersed in a crosslinking bath (an aqueous solution of boric acid obtained by mixing 100 parts by weight of water with 3 parts...

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Abstract

The invention relates to a polarizer, a polarizing plate and an image display device. The invention provides a polarizer that makes it possible to expand and advance functionality of an electronic device such as an image display device. The polarizer according to an embodiment of the present invention includes a resin film containing iodine, in which a transparent portion having a transmittance higher than that of other portions is formed in the polarizer, and a monolithic hue (a2 + b2)1 / 2 of the transparent portion is less than 1.0, where a represents a value of a Lab chromaticity system and b represents a value of a Lab chromaticity system.

Description

[0001] This application is a divisional application of an application with a filing date of September 28, 2016, an application number of 201610862919.0, and an invention title of "polarizing plate, polarizing plate and image display device". [0002] This application claims priority under 35 U.S.C. Section 119 from Japanese Patent Application No. 2015-190081 filed September 28, 2015, which is incorporated herein by reference. technical field [0003] The present invention relates to a polarizer, a polarizer and an image display device. Background technique [0004] Some image display devices such as cellular phones and notebook personal computers (PCs) have mounted internal electronic parts such as cameras and the like. Various studies have been conducted for the purpose of improving camera performance of, for example, any such image display device (for example, Japanese Patent Application Laid-Open No. 2011-81315, Japanese Patent Application Laid-Open No. 2007-241314, US 20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCG02B5/3033C09D129/04C08L2205/025G02B5/3025G02B5/305B29D11/00644B29D11/00894B29K2105/0032C08K3/01C08L29/04G02B1/04C08J3/20C08J5/18C08K3/02C08K3/08B29C55/02C08J7/02C08L2201/10C09D5/29B29K2029/00
Inventor 后藤周作八重樫将宽
Owner NITTO DENKO CORP
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