Liquid crystal panel comprising liquid crystal cell having multigap structure, and liquid crystal display device

A technology of liquid crystal panels and liquid crystal units, applied in optical elements, polarizing elements, optics, etc., can solve problems such as large chromatic aberrations, and achieve the effect of reducing chromatic aberrations

Active Publication Date: 2009-08-12
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, liquid crystal display devices employing such a liquid crystal cell and a polarizing plate having a conventional structure have the problem of large color shift in an oblique direction.

Method used

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  • Liquid crystal panel comprising liquid crystal cell having multigap structure, and liquid crystal display device
  • Liquid crystal panel comprising liquid crystal cell having multigap structure, and liquid crystal display device
  • Liquid crystal panel comprising liquid crystal cell having multigap structure, and liquid crystal display device

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Embodiment

[0116] The present invention is further illustrated using the following examples and comparative examples. In addition, this invention is not limited only to a following Example.

[0117] (1) The measurement method of the single transmittance of the polarizer:

[0118] The Y value after the visibility correction was measured using a spectrophotometer [manufactured by Murakami Color Technology Laboratory Co., Ltd., product name "DOT-3"] with a 2-degree field of view (C light source) according to JIS Z 8701-1982.

[0119] (2) The measuring method of the degree of polarization of the polarizer:

[0120] The parallel transmittance (H 0 ) and orthogonal transmittance (H 90 ), using the formula: degree of polarization (%)={(H 0 -H 90 ) / (H 0 +H 90 )} 1 / 2 ×100 obtained. The above parallel transmittance (H 0 ) is a value of the transmittance of a parallel laminated polarizing plate produced by superimposing two identical polarizing plates so that their absorption axes are par...

reference example 1

[0128] Production of liquid crystal unit

[0129] A colored resin solution in which a pigment is dispersed is applied on a glass substrate on which a black matrix is ​​formed, and is prebaked and dried to form a colored resin layer. Next, a positive resist (positive resist) is applied on this colored resin layer, exposure is performed using a photomask, development of the positive resist and etching of the colored resin layer are performed using a developer. After that, the positive resist is stripped. In order to form red, green, and blue color filters, this operation was repeated three times, and the thickness of the colored resin layer (color filter) of each color was changed, and the color filter board|substrate was produced.

[0130] Next, thin film transistors, scanning lines, signal lines, and pixel electrodes are formed on another glass substrate to produce an active matrix substrate. An oriented film was formed on the two substrates, and the surface of the film wa...

reference example 2

[0134] Production of the first polarizer

[0135] A polymer film (trade name "VF-PS#7500" manufactured by Kuraray Co., Ltd.) mainly composed of a polyvinyl alcohol-based resin with a thickness of 75 μm was immersed in an aqueous solution containing iodine and potassium iodide (iodine Concentration = 0.03% by weight), and tension was applied to the film in the longitudinal direction, and stretched so that the final stretch ratio was 6.2 times the original length to produce a polarizer (a). The polarizer (a) has a thickness of 25 μm, a degree of polarization P=99%, and a single transmittance T=43.5%.

[0136] Next, a norbornene-based polymer film [optes( Co., Ltd. (Optes Inc.) product name "ZEONOR ZF14"] was stretched to 1.2 times to produce a retardation film (a). The refractive index ellipsoid of the retardation film (a) satisfies the relationship of nx>ny>nz,

[0137] Thickness 32μm,

[0138] T[550]=90%,

[0139] Re[550]=60nm,

[0140] Rth[550]=72nm,

[0141] Nz coef...

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Abstract

Disclosed is a liquid crystal panel comprising a liquid crystal cell, a first polarizing plate arranged on one side of the liquid crystal cell, and a second polarizing plate arranged on the other side of the liquid crystal cell. The liquid crystal cell comprises red, green and blue color filters and a liquid crystal layer, and the liquid crystal layer has a multigap structure satisfying the following relation: dR >= dG > dB. The first polarizing plate comprises a first polarizer and a first protection layer arranged on the liquid crystal cell side of the first polarizer, and the first protection layer has an indicatrix satisfying the following relation: nx > ny >= nz. A liquid crystal display employing such a liquid crystal panel is reduced in color shift in an oblique direction, thereby having excellent image display characteristics.

Description

technical field [0001] The present invention relates to a liquid crystal panel including a liquid crystal cell having a multi-gap structure and a liquid crystal display device. Background technique [0002] A liquid crystal display device is an element that displays characters and images by using the electro-optic properties of liquid crystal molecules. Liquid crystal display devices are widely used in mobile phones, notebook computers, liquid crystal televisions, and the like. However, since liquid crystal display devices use liquid crystal molecules with optical anisotropy, there is a problem that although excellent display characteristics are exhibited in one direction, the screen becomes dark or unclear in other directions. In order to solve the above problems, a plurality of retardation films are used in liquid crystal display devices. [0003] In addition, a liquid crystal cell having a so-called multi-gap structure in which the thickness of the liquid crystal layer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02F1/13363G02B5/20G02B5/30
CPCG02F1/133371G02B5/223G02B5/201G02F1/13363G02F1/133514G02B5/20G02B5/30G02F1/1335
Inventor 吉见裕之龟山忠幸朝永政俊林政毅
Owner NITTO DENKO CORP
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