Liquid crystal panel and liquid crystal display apparatus

A liquid crystal panel and liquid crystal layer technology, applied in identification devices, static indicators, optics, etc., can solve the problems of insufficient improvement of oblique contrast, reduced contrast, and increased display color change phenomenon

Active Publication Date: 2006-06-07
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A problem with conventional liquid crystal display devices equipped with IPS mode liquid crystal cells is that when the screen is viewed obliquely at an angle of 45° to the absorption axis of the polarizer (45°, 135°, 225° or 315° in azimuth), Contrast is reduced; and display color shifting (also known as color shift) increases with the viewing angle of the screen
However, this technique improves color shift, but does not sufficiently improve oblique contrast

Method used

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  • Liquid crystal panel and liquid crystal display apparatus
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  • Liquid crystal panel and liquid crystal display apparatus

Examples

Experimental program
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Effect test

preparation example Construction

[0214] Fabrication of Cathode Biaxial Optical Elements

[0215] [Reference Example 1]

[0216] A commercially available polymer film containing cellulose ester as a main component " KC12UR" (trade name, thickness 120 μm, purchased from KonicaMinolta Holdings, Inc, (Konica Minolta Holdings)) was longitudinally uniaxially stretched 1.30 times while fixing the longitudinal direction of the film, thereby preparing retardation film A. Table 1 shows the properties of the retardation film A obtained. Re[590] of the polymer film (before stretching) was 12 nm and Rth[590] was 113 nm.

[0217] [Reference Example 2]

[0218]A polymer film (thickness: 160 μm), wherein the hydroxyl groups of cellulose are partially substituted by acetyl groups and partially substituted by propionyl groups. The polymer film was uniaxially stretched longitudinally by 1.15 times using a roll stretcher at 150°C (temperature measured at a distance of 3 cm from the back of the film, with a temperature fluct...

Embodiment 1

[0245] The liquid crystal target was removed from a commercially available liquid crystal display device "KLV-17HR2" (manufactured by Sony Corporation) equipped with an IPS mode liquid crystal cell. The polarizing plates disposed above and below the liquid crystal cell were removed, and the glass surfaces (front and rear surfaces) of the liquid crystal cell were cleaned. Subsequently, using an acrylic pressure-sensitive adhesive layer (20 μm in thickness), the retardation film E prepared in Reference Example 5 was attached as an anode C plate to the surface of the liquid crystal cell on the viewing side so that the slow axis of the retardation film E was parallel At (0°±0.2°) the longer side of the liquid crystal cell. Next, using an acrylic pressure-sensitive adhesive layer (10 μm in thickness), the retardation film A prepared in Reference Example 1 was attached as a cathode biaxial optical element to the surface of the retardation film E so that the retardation of the retard...

Embodiment 2

[0249] A liquid crystal panel was prepared in the same manner as in Example 1, except that retardation film B was used instead of retardation film A as the cathode biaxial optical element, thereby measuring oblique contrast and oblique color shift. Table 3 shows the results obtained.

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Abstract

The present invention provides a liquid crystal panel according to an embodiment of the present invention, comprising a liquid crystal unit, a first polarizer disposed on one side of the liquid crystal unit, a second polarizer disposed on the other side of the liquid crystal unit, disposed between the liquid crystal unit and The cathode biaxial optical element and the anode C plate between the first polarizer and the isotropic optical element arranged between the liquid crystal unit and the second polarizer. Here, the cathode biaxial optical element is arranged between the first polarizer and the anode C-plate.

Description

[0001] This application claims the benefit of Japanese Patent Application No. 2004-344053 filed on November 29, 2004 and Japanese Patent Application No. 2005-244847 filed on August 25, 2005 under Title 35 Federal Code Section 119, It is hereby incorporated by reference in its entirety. technical field [0002] The invention relates to a liquid crystal panel with a liquid crystal unit, a polarizer and an optical element. Furthermore, the present invention relates to a liquid crystal television using the liquid crystal panel and a liquid crystal display device using the liquid crystal panel. Background technique [0003] A liquid crystal display device configured with a liquid crystal cell of an in-plane switching (IPS) mode includes applying a horizontal electric field to liquid crystal molecules that are substantially horizontally aligned without applying an electric field, thereby rotating the liquid crystal molecules by 45°, while controlling light transmittance. (white d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02B5/30G02F1/133G02F1/13363G02F1/139G09F9/00
CPCG02B5/3016G02F1/1335G02F1/133634G02F1/134363G02F1/141G02F2201/50G02F1/133531G02B5/30G02F1/13363
Inventor 小林显太郎矢野周治小石直树
Owner NITTO DENKO CORP
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