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Liquid crystal display device and polarizing disc combination therefor

A liquid crystal display device and polarizer technology, which are applied in polarizing elements, automatic watering devices, applications, etc., can solve problems such as the increase of visible angle shift, and achieve the effects of expanding contrast and viewing angle, suppressing light leakage, and suppressing color shift.

Active Publication Date: 2006-08-02
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Even if the configuration described in Patent Document 2 or Patent Document 3 is adopted, there is still a limit to the expansion of the viewing angle for displaying equal contrast, or the problem that the color shift caused by the viewing angle increases, and further improvement is desired.

Method used

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  • Liquid crystal display device and polarizing disc combination therefor
  • Liquid crystal display device and polarizing disc combination therefor
  • Liquid crystal display device and polarizing disc combination therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] (a) Composite polarizer

[0105] A transparent protective film made of triacetyl cellulose is attached to both sides of a polarizer prepared to absorb orientated iodine in polyvinyl alcohol (one piece of Rth is 65nm, R 0 1nm) linear polarizer. On one side of the protective film, a polystyrene film having negative intrinsic birefringence is bonded with a polyvinyl alcohol-based adhesive so that the absorption axis of the linear polarizer is perpendicular to the slow axis of the retardation plate. Free end longitudinal uniaxially stretched film, ie R 0 A retardation plate with a diameter of 140nm and an Nz coefficient of 0.0 is used as a compound polarizer.

[0106] (b) Fabrication and evaluation of liquid crystal display devices

[0107] On the front (visible side) of the liquid crystal cell "W000 3000" in the same IPS mode as used in Comparative Example 1, acrylic pressure-sensitive adhesive was applied in such a manner that a retardation plate and a linear polarizin...

Embodiment 2

[0109] In addition to converting the retardation plate to R 0 Evaluation was carried out in the same manner as in Example 1, except that the free-end longitudinally uniaxially stretched polystyrene film had a thickness of 130 nm and an Nz coefficient of 0.0. As a result, both the color shift and the change in luminance due to the viewing angle were small, and were approximately at the same level as in Example 1.

Embodiment 3

[0111] Evaluation was performed in the same manner as in Example 1, except that the polarizing plate on the back side was changed to "SRW042A" manufactured by Sumitomo Chemical Co., Ltd. (Rth of one side of the transparent protective layer was 34 nm). As a result, it was confirmed that both the color shift and the luminance change due to the viewing angle were small.

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Abstract

The present invention provides an IPS (In-Plane Switching) mode liquid crystal display apparatus having a wide viewing angle with equal contrast and little color shift depending on a viewing angle, and to provide a polarizing plate set effective to enhance the viewing angle by disposing in both sides of a liquid crystal cell of an IPS mode liquid crystal display apparatus. The liquid crystal display apparatus is equipped with an IPS mode liquid crystal cell 50 and a first polarizing plate 10 and a second polarizing plate 20 disposed to sandwich the liquid crystal cell, wherein a retardation plate 30 is disposed between the first polarizing plate 10 and the liquid crystal cell 50. The sum of retardation Rth in the thickness direction of birefringent layers (a protective layer 12 and the retardation plate 30) present between a polarizer 11 constituting the first polarizing plate 10 and the above retardation plate 30 ranges from -40 nm to +40 nm, and the sum of retardation R0in the plane of the above layers ranges from 100 nm to 200 nm. The second polarizing plate 20 includes transparent protective layers 22, 23 applied on both sides of a polarizer 21, wherein the retardation Rth in the thickness direction of the transparent protective layer 22 placed in the liquid crystal cell side of the polarizer 21 ranges from -10 nm to +40 nm.

Description

technical field [0001] The present invention relates to a liquid crystal display device capable of realizing a wide viewing angle in a transverse electric field (In-Plane Switching: IPS) mode. In addition, the present invention also relates to a polarizer combination used in the liquid crystal display device. Background technique [0002] In recent years, due to various advantages such as low power consumption, low-voltage operation, light weight, and thin shape, liquid crystal display devices (LCD) have been used as information devices such as mobile phones, portable information terminals (Personal Digital Assistant: PDA), personal computers, and televisions. The use of display devices is rapidly increasing. With the development of LCD technology, various modes of LCDs have been proposed, and problems such as response speed, contrast ratio, and narrow viewing angle of LCDs have been solved. In addition, the viewing angle is further improved by sandwiching a retardation pl...

Claims

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Application Information

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IPC IPC(8): G02F1/1335G02F1/133G02B5/30
CPCA01C1/044A01G9/02A01G27/005A01G27/02E01D19/103
Inventor 角谷英则
Owner SUMITOMO CHEM CO LTD
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