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Liquid crystal display device

A technology of a liquid crystal display device and a liquid crystal layer, which is applied in the fields of nonlinear optics, instruments, and optics, and can solve problems such as the difficulty in achieving a sufficient reduction in the cost of material components, the deterioration of the area utilization efficiency of the polarizing film roll, and the angle error of the polarizing plate. Achieve the effect of improving viewing angle characteristics, simple structure, and good symmetry

Inactive Publication Date: 2011-05-25
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0035] In addition, according to the method of the prior art 2, in the case of improving the display quality of the liquid crystal panel in the TN display mode, it is necessary to laminate an optical film with a special function on the polarizing plate, resulting in an increase in the layer thickness of the component, and lead to an increase in cost in terms of component prices
[0036] In addition, in the existing liquid crystal panel of TN display mode, since the polarizing plate must be rotated to +45 degree direction or +135 degree direction relative to the extending direction of the polarizing plate film roll when manufacturing the polarizing plate, and the Basically, a pair of polarizing plates are arranged on the liquid crystal panel, so the problem that angle errors easily occur in the polarizing plates becomes obvious.
[0037] And, if Figure 20 As shown, in the production and cutting process of the existing polarizing plate, since the cutting of the film is performed by rotating the sheet-shaped polarizing plate film to the direction of +45 degrees, the remaining part will be produced on the film. Therefore, the polarization The area utilization efficiency of the film roll as a whole becomes worse
As a result, there is a problem that it is difficult to sufficiently reduce the cost of material parts

Method used

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Examples

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Embodiment 1

[0176] The following is based on Figure 8 An embodiment of the present invention will be described.

[0177] The liquid crystal (LCD) panel 100A includes a first substrate (CF substrate) 100 a sandwiching a liquid crystal layer 120 , and a second substrate (TFT substrate) 100 b. The first substrate 100a and the second substrate 100b respectively have: a transparent substrate (such as a glass substrate) 110a, a transparent substrate 110b disposed opposite to the transparent substrate 110a, and a liquid crystal layer 120 disposed between the transparent substrates 110a and 110b. On the surface in contact with the liquid crystal layer 120 on each of the transparent substrates 110a and 110b, a liquid crystal alignment layer (not shown) is formed into a film, and the opposite surfaces of each liquid crystal alignment layer are rubbed along the prescribed rubbing direction 115a and 115b (towards the dashed arrow) implements orientation constraints.

[0178] When no voltage is app...

Embodiment 2

[0185] In this example, the arrangement relationship of the rubbing direction of the substrate, the absorption axis of the polarizing plate, and the in-plane slow axis of the biaxial retardation plate was changed in various ways. Through optical simulation, the contrast and viewing angle characteristics, in The azimuth-angle dependence and polar-angle dependence of the transmittance characteristics for each grayscale level, and the unevenness of the blackness are compared and evaluated between each arrangement relationship.

[0186] First, the change in the arrangement relationship that is the object of this optical simulation will be described. The following configuration examples 1 to 6 are based on the arrangement relationship of the present invention, and the following comparative examples 1 to 3 do not employ the arrangement relationship of the present invention.

[0187] In addition, the angles described below are expressed as angles in a rotating coordinate system in wh...

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Abstract

Disclosed is a TN liquid crystal display device (1) wherein a polarizing plate (4a), a liquid crystal panel (100) and a polarizing plate (4b) are sequentially arranged from the viewer side. In the TN liquid crystal display device (1), the rubbing directions (6a, 6b) of a first substrate (2a) and a second substrate (2b) are respectively set at an angle of about 45 DEG relative to absorption axes (4a, 4beta) of the polarizing plates (4a, 4b), and the absorption axes (4a, 4beta) are so arranged as to be perpendicular to each other. Additionally, for example, a biaxial retardation plate (5a), which is so designed as to have an in-plane slow axis (5a) at an angle of about 90 DEG relative to the absorption axis (4a) of the polarizing plate (4a), is interposed between the substrate (2a) and the polarizing plate (4a). Consequently, a TN liquid crystal display device having improved viewing angle characteristics and utilization efficiency of component members can be obtained at low cost.

Description

technical field [0001] The present invention relates to a liquid crystal display device with excellent display performance provided with less production loss, low cost and effective use of optical components, and more specifically, to a polarizer equipped with a widely used retardation plate. The panel system improves the area utilization efficiency of the components and suppresses the inversion phenomenon of the middle gray level, thereby improving the contrast-viewing angle characteristics of the TN display mode liquid crystal panel. Background technique [0002] Liquid crystal display devices are used in a wide range of fields by fully utilizing the advantages of light weight, thin profile, and low power consumption. Currently known is a twisted nematic (Twisted Nematic (TN)) mode which is one of the most widely used display modes in liquid crystal panels. [0003] In a liquid crystal panel of TN display mode, usually, nematic liquid crystal (Np liquid crystal) with posi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13363
CPCG02F2001/1398G02F1/1396G02F2001/133531G02F2413/12G02F1/133531G02F1/1398
Inventor 樱木一义山田信明津田和彦坂井彰
Owner SHARP KK