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Liquid crystal panel and liquid crystal display apparatus

A liquid crystal panel and liquid crystal unit technology, applied in optics, instruments, nonlinear optics, etc., can solve the problems of uneven phase difference, unobtained phase difference film, film rupture, etc., to prevent unevenness and long-term display performance The effect of maintaining and enhancing contrast

Active Publication Date: 2006-09-20
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, non-uniform stress due to the heat of the backlight may cause non-uniformity in the retardation value
[0005] Meanwhile, the photoelastic coefficient of an aliphatic resin film such as a norbornene-based resin film is small
However, an aliphatic resin film hardly causes retardation, and a desired retardation value cannot be obtained by stretching at a low draw ratio or even at a high draw ratio as in an aromatic polymer film.
Stretching at high draw ratios can lead to problems with film breakage
Therefore, a retardation film of an aliphatic resin film having a small photoelastic coefficient and a relationship of nx>ny>nz can be obtained by conventional techniques (for example, JP 2001-215332 A), but a phase difference film having a relationship of nx>nz>ny has not been obtained so far. Retardation film

Method used

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  • Liquid crystal panel and liquid crystal display apparatus
  • Liquid crystal panel and liquid crystal display apparatus
  • Liquid crystal panel and liquid crystal display apparatus

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0256] A biaxially stretched polypropylene film "TORAYFAN B02873" (trade name, thickness 60 μm, available from Toray Industrial Co., Ltd.) having the properties shown in Table 1 was passed through an acrylic pressure-sensitive adhesive layer (thickness 15 μm). ) was attached to both sides of a norbornene-based resin film "ZEONORZF14-100" (trade name, thickness 100 µm, available from Zeon Corporation). Then, using a roll stretching machine, the resulting product was stretched 1.38 times in an air-circulating constant temperature heating furnace at 146° C. (the temperature at a distance of 3 cm from the rear surface of the film, temperature fluctuation ± 1° C.), while fixing the thickness of the film. longitudinal direction, thereby manufacturing retardation film A. Table 2 shows the properties of the obtained retardation film. The norbornene-based film had a glass transition temperature (Tg) of 136° C., an internal retardation value of 5.0 nm before stretching, and a retardati...

preparation Embodiment 2

[0260] Retardation film B was manufactured in the same manner as in Preparation Example 1, except that the stretching temperature was changed from 146° C. to 148° C., and the draw ratio was changed from 1.38 times to 1.40 times. Table 2 shows the stretching conditions and properties of the obtained retardation film B.

preparation Embodiment 3

[0262] Retardation film C was produced in the same manner as in Example 1, except that the stretching temperature was changed from 146° C. to 148° C., and the draw ratio was changed from 1.38 times to 1.35 times. Table 2 shows the stretching conditions and properties of the obtained retardation film C.

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Abstract

A liquid crystal panel having improved contrast ratio in an oblique direction and good display evenness without causing shift or unevenness in retardation values due to shrinkage stress of a polarizer or heat of backlight is provided. A liquid crystal panel according to an embodiment of the present invention includes: a liquid crystal cell; a polarizer arranged on both sides of the liquid crystal cell; a first optical element arranged between one polarizer and the liquid crystal cell; and a second optical element arranged between the other polarizer and the liquid crystal cell, wherein: the first optical element comprises a retardation film containing a norbornene-based resin and satisfying the following expressions (1) and (2); and the second optical element has substantially optical isotro.

Description

technical field [0001] The invention relates to a liquid crystal panel with a liquid crystal unit, a polarizer and an optical element. Furthermore, the present invention relates to a liquid crystal television and a liquid crystal display device both using the liquid crystal panel. Background technique [0002] A liquid crystal display device equipped with an in-plane switching (IPS) mode liquid crystal cell, comprising rotating the liquid crystal molecules by approximately 45° by applying a horizontally oriented electric field to the substantially horizontally aligned liquid crystal molecules without applying an electric field, so that the transmissive The light rate (white display) and shading rate (black display) are controlled. A problem with conventional liquid crystal display devices equipped with IPS mode liquid crystal cells is that the contrast of the screen decreases when viewed obliquely at an angle of 45° to the absorption axis of the polarizer (45°, 135°, 225°, ...

Claims

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Application Information

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IPC IPC(8): G02F1/1335G02B5/30G02F1/1337
Inventor 与田健治矢野周治小石直树林政毅
Owner NITTO DENKO CORP
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