Liquid crystal panel and liquid crystal display

A liquid crystal panel and liquid crystal cell technology, which is applied in liquid crystal materials, optics, instruments, etc., can solve the problems of increased thickness, decreased contrast ratio, and image chromatic aberration, and achieves the effect of less light leakage, small color shift, and high contrast ratio.

Inactive Publication Date: 2009-09-23
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional liquid crystal display devices equipped with liquid crystal cells of the IPS method have problems in that the display characteristics deteriorate: the contrast ratio decreases in the oblique direction, and the chromatic aberration of the image (also referred to as the oblique direction) that changes with the viewing angle changes occurs. color cast) etc.
Therefore, the thickness of the produced λ / 2 plate becomes large, which makes it difficult to reduce the thickness of the liquid crystal display device.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0232] The present invention will be described more specifically using the above examples and comparative examples. In addition, this invention is not limited only to these Examples. In addition, each analysis method used in the Example is as follows.

[0233] (1) Measuring method of monomer transmittance and degree of polarization of polarizer:

[0234] Measurement was performed at 23° C. using a spectrophotometer [manufactured by Murakami Color Technology Laboratory Co., Ltd. product name “DOT-3”].

[0235] (2) Determination method of thickness:

[0236] When the thickness is less than 10 μm, the film is measured using a spectrophotometer [Otsuka Electronics Co., Ltd. product name "instant multichannel photodetector (internsified multichannel photodetector) MCPD-2000"]. When the thickness is 10 μm or more, it measures using a digital micrometer “KC-351C type” manufactured by Anritsu Corporation.

[0237] (3) Determination method of phase difference (Re, Rth):

[0238] M...

reference example 1

[0247] [Reference Example 1]: Production of Polarizer

[0248]A polymer film mainly composed of polyvinyl alcohol [Kuraray Co., Ltd. product name "9P75R (thickness: 75 μm, average degree of polymerization: 2,400, degree of saponification: 99.9 mol%)"] was kept at 30°C ± 3°C. In a dyeing bath prepared with iodine and potassium iodide, a roller stretching machine was used to uniaxially stretch 2.5 times while dyeing. Secondly, in the aqueous solution prepared by boric acid and potassium iodide kept at 60±3°C, the crosslinking reaction is carried out while the uniaxial stretching is carried out, so that the polyvinyl alcohol film is stretched to 6 times the original length. The obtained film was dried in an air-circulating constant temperature oven at 50°C±1°C for 30 minutes to obtain polarizers P1 and P2 with a moisture content of 26%, a thickness of 28 μm, a degree of polarization of 99.9%, and a single transmittance of 43.5%.

reference example 2

[0249] [Reference Example 2]: Production of Polarizer Protective Film

[0250] A cellulose triacetate film (trade name "FUJITACUZ (thickness: 80 μm)" manufactured by Fuji Film Co., Ltd.) was used as the polarizing plate protective film.

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Abstract

Disclosed are an extremely thin liquid crystal panel and liquid crystal display, each of which has a high contrast ratio in an oblique direction, a little light leakage, and a small color shift in an oblique direction. Specifically disclosed is a liquid crystal panel comprising a liquid crystal cell; a first polarizer, an optical element (A) and an optical element (B) arranged on one side of the liquid crystal cell; and a second polarizer arranged on the other side of the liquid crystal cell. The optical element (A) has an index ellipsoid satisfying the relationship of nx > nz > ny and is composed of a specific polycyclic compound, while having an Nz coefficient of 0.05-0.45. The optical element (B) has an index ellipsoid satisfying the relationship of nx > nz > ny and an Nz coefficient of 0.55-0.95.

Description

technical field [0001] 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 display device using the above liquid crystal panel. Background technique [0002] Liquid crystal display devices have attracted attention due to their thinness, light weight, and low power consumption, and are widely used in portable devices such as mobile phones and clocks; office automation equipment such as computer monitors and notebook computers; video cameras and LCD TVs, etc. Household electrical products, etc. The reason for this is that the shortcomings of display characteristics changing with the viewing angle of the screen, or inability to operate under conditions such as high temperature or extremely low temperature have been continuously overcome by technological innovation. However, with the diversification of uses, it is gradually required to satisfy different ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13363G02F1/1335G02B5/30G02F1/1343
CPCG02F2413/08G02F2413/02G02F1/133634G02F2413/07G02F2413/12C09K2323/031G02F1/1335C09K19/02
Inventor 宫崎顺三松田祥一长塚辰树
Owner NITTO DENKO CORP
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