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Polarizing plate, liquid crystal display and protective film

A technology of liquid crystal display devices and polarizers, which is applied in the direction of identification devices, polarizing elements, instruments, etc., can solve the problems of polarizer polarization decrease, film shrinkage, etc., and achieve improved scratch resistance, less light leakage, and improved appearance Effect

Active Publication Date: 2009-06-17
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when polarizers having these films are placed in a high-temperature, high-humidity environment, the following problems arise: when the residual solvent volatilizes, the films shrink, and the polarized light of the polarizer to which the films are attached degree drop etc.

Method used

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  • Polarizing plate, liquid crystal display and protective film
  • Polarizing plate, liquid crystal display and protective film
  • Polarizing plate, liquid crystal display and protective film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0211] In the following examples, the polarizing plate includes a polarizer (P), an exit-side protective film (first protective film (A)) attached to the exit side of the polarizer (P), ), the incident side protective film (second protective film (B)) on the incident side, the hard coat layer (H) laminated on the viewing side surface of the output side protective film (first protective film (A)), Low refractive index (anti-reflection) layer (L) on the outer surface of layer (H). In all the Examples and Comparative Examples, the polarizer (P), the hard coat layer (H) and the low-refractive-index layer (L) all used products of the same composition described later having the same thickness.

[0212] It will be described in detail later. In embodiment 1-1, as the first protective film, a polymethyl methacrylate (PMMA) resin layer-low hardness polymethyl methacrylate (R-PMMA) resin layer- A laminated film (A1) composed of three layers of a polymethyl methacrylate (PMMA) resin laye...

manufacture example 1

[0219] (Manufacturing example 1: Production of polarizer)

[0220] A polyvinyl alcohol film with a refractive index of 1.545 at a wavelength of 380nm, a refractive index of 1.521 at a wavelength of 780nm, and a thickness of 75 μm was uniaxially stretched to 2.5 times. ℃ aqueous solution for 240 seconds, and then immersed in an aqueous solution containing boric acid 70g / L and potassium iodide 30g / L, while uniaxially stretching to 6.0 times and maintaining for 5 minutes. Finally, it was dried at room temperature for 24 hours to obtain a polarizer (P) having an average thickness of 30 μm and a degree of polarization of 99.95%.

manufacture example 2

[0221] (Manufacturing example 2: Preparation of material for forming hard coat layer (H))

[0222] Mix 30 parts of 6-functional urethane acrylate oligomer, 40 parts of butyl acrylate, 30 parts of isophorone methacrylate and 10 parts of 2,2-diphenylethane-1-one with a homogenizer Then, mix 40% methyl isobutyl group of antimony pentoxide particles (average particle diameter 20nm, hydroxyl group is combined with antimony atom appearing on the surface of pyrochlore structure, the combination ratio is 1 antimony atom combined with a hydroxyl group) A ketone solution was mixed in such a ratio that the weight of antimony pentoxide fine particles accounted for 50% by weight of the total solid content of the composition for forming a hard coat layer to prepare a material for forming a hard coat layer (H).

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Abstract

Disclosed is a polarizing plate having high mechanical strength, while being excellent in flexibility and abrasion resistance. This polarizing plate is not deteriorated in visibility even under high temperature, high humidity conditions, and hardly suffers from visibility obstacles such as color shading due to dimensional change. Also disclosed is a liquid crystal display using such a polarizing plate. A film mainly containing a thermoplastic resin and composed of a plurality of layers is employed as a first protective film used on the viewer side of the polarizing plate, and at least one surface layer of the first protective film is mainly composed of an acrylic resin. A second protective layer having specific characteristics is arranged on the liquid crystal cell side.

Description

technical field [0001] The present invention relates to a polarizing plate having good mechanical strength, no dimensional change under high temperature and high humidity environment, and capable of maintaining high visibility (visual) and a liquid crystal display device using the polarizing plate. properties), good scratch resistance. Background technique [0002] The polarizing plate used for a liquid crystal display device etc. consists of a polarizer and two protective films arrange|positioned in the form facing each other with this polarizer interposed at least. As a polarizer constituting this polarizing plate, a film obtained by forming a film of polyvinyl alcohol by a solution casting method to absorb iodine or a dichroic dye and then cast in a boric acid solution is generally used. obtained by stretching. [0003] On the other hand, because of its good transparency, the protective film is mostly made of triacetate cellulose film (TAC film). However, the TAC film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/30B32B27/18G02B1/10G02B5/30G02F1/1335G09F9/00
CPCG02F1/13338G02F1/133528G02B1/105G02B5/3083G06F3/045G02B1/14G02B5/30G02F1/13363
Inventor 吉原真纪荒川公平井上恭辅波多野拓丰嶋哲也
Owner ZEON CORP
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