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Circular polarization plate and liquid crystal display device

A liquid crystal display and polarizer technology, applied in polarizing elements, instruments, optics, etc., can solve the problems of reduced contrast and the inherent difficulty of expanding the viewing angle of circular polarizers

Inactive Publication Date: 2008-04-30
NIPPON OIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the transmissive mode of a TN-LCD, a problem related to the viewing angle cannot be avoided, that is, the color of the displayed image changes and the contrast decreases when viewed obliquely due to the birefringence peculiar to the liquid crystal molecules, and the use of a polymerized stretched film It is inherently difficult for circular polarizers to expand viewing angles

Method used

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  • Circular polarization plate and liquid crystal display device
  • Circular polarization plate and liquid crystal display device
  • Circular polarization plate and liquid crystal display device

Examples

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Effect test

example 1

[0063] A circular polarizer was fabricated using a 1.32 μm thick liquid crystal film 7 with a fixed nematic mixed orientation with an average tilt angle of 15° in the thickness direction. Using this circular polarizer to fabricate a image 3 A TN type transflective liquid crystal display of the structure shown.

[0064] The liquid crystal cell 4 contained ZLI-1695 manufactured by Merck Co., Ltd. as a liquid crystal material. Among the parameters of the cell, the cell gap was 3.5 μm, the twist angle (left-handed twist) was 63°, and the pretilt angle was 2°.

[0065] A polarizer 1 (SQW-862 manufactured by Sumitomo Chemical Industry Co., Ltd.) with a thickness of 180 μm is located on the display side (upper part of the figure) of the liquid crystal cell 4, and each is an optical retardation compensator composed of a uniaxially stretched polycarbonate film 2 and 3 are located between the polarizer 1 and the liquid crystal cell 4 . In addition, a transflector 5 is located on the ...

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Abstract

A circular polarization plate having favorable circular polarization characteristics and a liquid crystal display device equipped with this circular polarization plate. The circular polarization plate is constituted of at least a polarization plate and an optical anisotropic element having a phase difference of approximately 1 / 4 wavelength in the visible light region and characterized in that the optical anisotropic element is constituted of at least a liquid crystal film with a fixed nematic hybrid orientation structure.

Description

technical field [0001] The present invention relates to circular polarizers and liquid crystal displays having circular polarizers. Background technique [0002] In recent years, liquid crystal displays are expected to expand their market in the field of personal digital assistant (PDA) displays that can make full use of their thin and light features. Since such personal digital assistants (PDAs) are usually battery-operated, power consumption needs to be kept as low as possible. Therefore, reflective liquid crystal displays for personal digital assistants are particularly attractive, which do not have or need to use a power-hungry backlight at all times, and can reduce power consumption, thickness and weight. [0003] Reflective liquid crystal displays with two polarizers for black and white displays have been widely used, where a liquid crystal cell is sandwiched between a pair of polarizers and a reflector is positioned outside one of the polarizers. In addition, a refl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1335G02B5/30G09F9/00G02F1/13363
CPCG02B5/3016G02F2001/133541G02F1/133528G02F1/133632G02F1/133555G02F2413/105G02F2001/133638G02F1/133541G02F1/133638G02F1/1335
Inventor 上坂哲也依田英二豊岡武裕
Owner NIPPON OIL CO LTD