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Elongated polarizer, elongated polarizing plate, and image display device

A technology for image display devices and polarizing plates, applied in the direction of identification devices, polarizing elements, optical elements, etc., to achieve the effects of excellent optical characteristics, excellent axis accuracy, and excellent yield

Active Publication Date: 2020-02-14
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to realize these demands industrially and commercially, it is desirable to manufacture image display devices and / or their components at an acceptable cost, however, there are still various issues that should be reviewed in order to establish such a technology

Method used

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  • Elongated polarizer, elongated polarizing plate, and image display device
  • Elongated polarizer, elongated polarizing plate, and image display device
  • Elongated polarizer, elongated polarizing plate, and image display device

Examples

Experimental program
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Effect test

Embodiment 1

[0177] As the resin substrate, a long amorphous isophthalic acid-copolyethylene terephthalate (IPA-copolyethylene PET) film (thickness: 100 μm) with a water absorption rate of 0.75% and a Tg of 75° C. was used. Apply corona treatment to one side of the substrate, and apply polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified coating on the corona treatment surface at a ratio of 9:1 at 25°C. An aqueous solution of PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, Nippon Synthetic Chemical Industry Co., Ltd. product name "Gohsefimer Z200") was dried to form a PVA-based resin layer with a thickness of 11 μm , making a stack.

[0178] The obtained laminate was uniaxially stretched to 2.0 times in the longitudinal direction (longitudinal direction) between rollers having different peripheral speeds in an oven at 120° C. (assisted stretching in the air).

[0179] Next, ...

Embodiment 2

[0188] A PVA film (manufactured by Kuraray, PE6000) with a thickness of 60 μm was immersed in an aqueous solution at 30° C. for 30 seconds (swelling step).

[0189] Next, the PVA film was immersed in a dyeing bath at a liquid temperature of 30° C. while adjusting the iodine concentration and immersion time so that the obtained polarizing plate had a predetermined transmittance. In this example, it was immersed for 60 seconds in an iodine aqueous solution obtained by mixing 0.15 parts by weight of iodine and 1.0 parts by weight of potassium iodide with respect to 100 parts by weight of water (dyeing treatment).

[0190] Next, it was immersed for 30 seconds in a crosslinking bath (a boric acid aqueous solution obtained by mixing 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 30° C. (crosslinking treatment).

[0191] Then, while immersing the PVA film in an aqueous solution of bori...

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Abstract

The present invention provides an elongated polarizer capable of realizing multi-functionalization and high functionality of electronic devices such as image display devices, without variation in quality as a final product, and excellent in yield during production. The polarizer of the present invention is composed of an elongated resin film containing a dichroic substance, the polarizer has non-polarizing parts arranged at predetermined intervals in the longitudinal direction and / or width direction, and the non-polarizing parts are partially decolorized decolorization part. The polarizing plate of the present invention is elongated and has the polarizer of the present invention and a protective film arranged on at least one side of the polarizer.

Description

technical field [0001] The invention relates to a strip-shaped polarizer, a strip-shaped polarizer and an image display device. More specifically, the present invention relates to a long polarizer having non-polarizing portions arranged in a predetermined pattern, a long polarizing plate using the same, and an image display device. Background technique [0002] Some image display devices such as mobile phones and notebook personal computers (PCs) are equipped with internal electronic components such as cameras. Various studies have been conducted for the purpose of improving the camera performance of such an image display device (for example, Patent Documents 1 to 7). However, with the rapid spread of smart phones and touch panel-type information processing devices, further improvements in camera performance and the like are expected. In addition, in order to cope with the diversification of shapes and higher functionality of image display devices, a polarizing plate havin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B32B7/023G02F1/1335G09F9/00
CPCB29D11/00644B29D11/0073B32B7/06B32B23/08B32B23/20B32B27/08B32B27/16B32B27/20B32B27/308B32B27/32B32B27/325B32B27/34B32B27/36B32B27/365B32B3/266B32B3/30B32B2255/10B32B2255/26B32B2307/536B32B2307/732B32B2307/748B32B2405/00B32B2457/202B32B2457/206G02F2201/50G02B1/14B32B7/12B32B2307/42B32B2457/20G02B5/3033G02F1/133528G02F2202/28H10K59/8791G02B5/305B32B37/12C08J5/18C08K3/22G02F1/133531H10K50/86H10K50/868B32B27/306G02F1/13363
Inventor 八重樫将宽尾込大介中野勇树济木雄二仲井宏太
Owner NITTO DENKO CORP