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Thin polarizer and image display apparatus using the same

A technology of polarizing plates and polarizers, applied in the field of polarizing plates, can solve problems such as the characteristics or effects of adhesives that are not recorded, and achieve the effects of thinning durability, excellent durability, and suppression of dimensional changes

Inactive Publication Date: 2008-08-20
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these publications are all limited to the description of the formation method of the adhesive layer or the lamination method of the protective layer. Although it can be said that the purpose of forming a thin polarizing plate is achieved, no specific details are described in terms of durability improvement. Adhesive properties or effects

Method used

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  • Thin polarizer and image display apparatus using the same
  • Thin polarizer and image display apparatus using the same
  • Thin polarizer and image display apparatus using the same

Examples

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Embodiment 1

[0094] On one side of a polarizer made of a film with a thickness of 25 μm in which iodine is adsorbed and oriented on polyvinyl alcohol, triacetyl cellulose with a thickness of 40 μm is pasted with an adhesive composed of an aqueous solution containing polyvinyl alcohol and a water-soluble epoxy resin The film constitutes the protective film, thereby preparing the polarizing plate. The pressure-sensitive adhesive A was attached to one side of the polyvinyl alcohol film to obtain a thin polarizing plate corresponding to FIG. 1 .

[0095] In addition, a retardation film with a pressure-sensitive adhesive was prepared, which was made of a norbornene-based resin with a thickness of 40 μm and an in-plane retardation of 140 nm. Acrylic pressure-sensitive adhesive with a thickness of 25 μm is provided on one side of the film, and the surface is covered with a spacer. After the spacer of the previously obtained thin polarizing plate was peeled off, the side of the phase difference p...

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Abstract

A polarizing plate provided with a pressure-sensitive adhesive layer on at least one side of the polarizer imparts good durability even in a high-temperature environment, and can laminate a polymer film thereon without troublesome workability. The polarizing plate with pressure-sensitive adhesive is laminated with a polymer film such as a phase difference plate to obtain a thinner composite polarizing plate, which is applied to an image display device. A polarizing plate (10) in which a pressure-sensitive adhesive layer (2) is provided on at least one side of a polarizer (1), wherein the pressure-sensitive adhesive layer (2) exhibits a storage capacity of 0.15-1 MPa at a temperature range of 23-80°C Elastic modulus of the pressure-sensitive adhesive layer. The pressure-sensitive adhesive layer (2) exhibiting a high storage elastic modulus suppresses dimensional changes caused by expansion and contraction of the polarizer (1) in a high-temperature environment. A polymer film (6) such as a phase difference plate is arranged on the outside of the pressure-sensitive adhesive layer (2) to make a composite polarizer (15, 16), and it is combined with an image display element such as a liquid crystal cell (20) to obtain an image display device.

Description

technical field [0001] The present invention relates to a polarizing plate used in an image display device such as a liquid crystal display device, and an image display device including the polarizing plate. The polarizing plate of the present invention has a thin and lightweight structure and is excellent in durability in a high-temperature environment, so it is particularly useful in various image display devices for mobile applications in which the module itself is intended to be thinner, lighter, and more durable. Background technique [0002] Liquid crystal display devices have been used in desktop computers, electronic timepieces, etc., but in recent years, their applications are rapidly expanding. That is, from mobile devices such as mobile phones to large televisions, liquid crystal display devices have begun to be used regardless of the screen size. In addition, in addition to liquid crystal display devices, organic electroluminescence (organic EL) display devices ...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B1/10G02F1/1335G09F9/00
CPCG02B5/3025B32B7/12B32B2307/42G02B5/3041G02B5/32
Inventor 金仁基
Owner SUMITOMO CHEM CO LTD
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