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Phase-difference layer laminated polarizing plate, liquid crystal panel, and liquid crystal display device

A retardation layer and polarizer technology, applied in the direction of polarizing elements, can solve the problems of reduced contrast, light leakage, and uneven display

Active Publication Date: 2010-06-23
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When using a polarizer with a retardation layer in a liquid crystal display device, it is usually attached to the liquid crystal unit by means of an adhesive layer, but there is a problem of uneven display in a high temperature environment
Furthermore, there is a problem that light leakage occurs at the edge of the screen and the contrast decreases.

Method used

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  • Phase-difference layer laminated polarizing plate, liquid crystal panel, and liquid crystal display device
  • Phase-difference layer laminated polarizing plate, liquid crystal panel, and liquid crystal display device
  • Phase-difference layer laminated polarizing plate, liquid crystal panel, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0236] (Preparation of adhesive layer)

[0237] In a reaction vessel equipped with a condenser tube, a nitrogen introduction tube, a thermometer and a stirring device, add 99 parts by weight of butyl acrylate, 1.0 parts by weight of 4-hydroxybutyl acrylate, 0.3 parts by weight of 2,2-azobisisobutyronitrile, and ethyl acetate to prepare a solution. Next, stirring was carried out blowing nitrogen gas into this solution, and polymerization reaction was performed at 60 degreeC for 4 hours, and the acrylic-type copolymer whose weight average molecular weight was 1.65 million was obtained.

[0238] Ethyl acetate was further added and diluted to the acrylate copolymer obtained above, and the polymer solution (1-A) whose total solid content concentration was 30 weight% was prepared. Next, to this polymer solution (1-A), 0.3 parts by weight of dibenzoyl peroxide [manufactured by NOF Corporation under the trade name "NYPER BO -Y"], 0.18 parts by weight of trimethylolpropane xylylene d...

Embodiment 2

[0249] Using 0.12 parts by weight of trimethylolpropane xylylene diisocyanate relative to 100 parts by weight of the above-mentioned acrylate copolymer to make an adhesive layer, except that, a Polarizing plate and liquid crystal display device of poor layer. The holding power of the obtained adhesive layer (H A ) is 150μm, holding force (H B ) is 100 μm, and the transmittance (T[590]) is 92%. The gel fraction was 82%, the glass transition temperature (Tg) was -38°C, and the water content was 0.25%.

Embodiment 3

[0251] A polarizing plate with a retardation layer and a liquid crystal display device were produced in the same manner as in Example 1, except that "WV Film SA" manufactured by Fujifilm Co., Ltd. was used as the retardation layer. The Re[590] of the film is 35nm, the Rth[590] is 155nm, the Nz coefficient is 4.43, and the average tilt angle is 18.9°.

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Abstract

This invention provides a polarizing plate with a phase difference layer, which has excellent double side contrast and can suppress uneven display caused under a high-temperature environment, and a liquid crystal panel and a liquid crystal display device. The polarizing plate with a phase difference layer comprises a pressure-sensitive adhesive layer, a phase difference layer comprising a resin layer and a slant alignment layer, and a polarizer provided in that order. The holding power (HA) of the pressure-sensitive adhesive layer at 60 C is not more than 300 [mu]m, and the direction of a slow phase axis of the phase difference layer is substantially perpendicular to the direction of an absorption axis of the polarizer. The slant alignment layer is formed of a liquid crystal composition containing a discotic compound which is in a slant aligned state.

Description

technical field [0001] The present invention relates to a polarizing plate with a retardation layer, a liquid crystal panel and a liquid crystal display device using the polarizing plate with a retardation layer. More specifically, the present invention relates to a polarizing plate with a retardation layer, a liquid crystal panel, and a liquid crystal display device that are excellent in screen contrast and can suppress display unevenness that occurs in a high-temperature environment. Background technique [0002] In various image display devices such as liquid crystal display devices and electroluminescence (EL) displays, various polarizers with a retardation layer in combination with a polarizer and a retardation layer are generally used for optical compensation. For example, a polarizing plate having a retardation layer formed of a discotic liquid crystalline polymer is mentioned (for example, refer to Patent Document 1). [0003] When a polarizing plate with a retardat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
Inventor 外山雄祐新田直幸佐竹正之本村弘则山本佳史
Owner NITTO DENKO CORP
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