Liquid crystal display device and polarizing disc combination therefor

A technology of liquid crystal display devices and polarizers, which is applied in polarizing elements, automatic watering devices, applications, etc., can solve the problems of increased visual angle shift, and achieve the effects of expanding the viewing angle of contrast, suppressing light leakage, and suppressing color shift

Active Publication Date: 2009-06-24
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 by absorbing and aligning iodine in polyvinyl alcohol (the Rth of one transparent protective film 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 retardati...

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

To provide a liquid crystal display device of IPS mode with wide viewing angle showing equal contrast and little color shift due to viewing angle. The liquid crystal display device comprising a liquid crystal cell (50) of IPS mode, a first polarizing plate (10) and a second polarizing plate (20) with said liquid crystal cell sandwiched therebetween. A phase differential shifter (30) is disposed between the first polarizing plate (10) and the liquid crystal cell (50). The sum of phase difference Rth in the direction of the thickness of birefringence layer (protective layer (12)+phase differential shifter (30)) existing from a polarizer (11) constituting the first polarizing plate (10) to said phase differential shifter (30) is in the range from -40nm to +40nm, while the sum of plane phase difference Ro in the range from 100nm to 200nm. As to the second polarizing plate (20), the two sides of polarizer (21) are provided with transparent protective layers (22, 23), the phase difference Rth in the direction of thickness of the transparent protection layer (22) located at the liquid crystal side of polarizer (21) is in the range from -10nm to +40nm.

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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Patent Type & Authority Patents(China)
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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