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Lc panel and LCD device

A liquid crystal panel, liquid crystal cell technology, applied in nonlinear optics, instruments, optics, etc., to achieve the effects of good display performance, increased contrast, and small photoelastic coefficient

Inactive Publication Date: 2008-07-30
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional technology as described above cannot provide a liquid crystal panel that satisfies these needs sufficiently

Method used

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  • Lc panel and LCD device

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0222] Using phosgene as the carbonate precursor, while (A) 2,2-bis-(4-hydroxyphenyl)propane and (B) 1,1-bis(4-hydroxypropyl)-3,3,5- Trimethylcyclohexane is used as an aromatic dihydric phenol component to obtain a weight-average molecular weight (Mw) of 60,000 and a polycarbonate resin (number The average molecular weight (Mn) was 33,000, Mw / Mn was 1.78, and the weight ratio (A):(B) was 4:6). 70 parts by weight of polycarbonate-based resin and 30 parts by weight of styrene-based resin (HIMER SB75, Sanyo Chemical Industries, Inc. , Ltd. (manufactured by Sanyo Chemical Industry Co., Ltd.)) was added to 300 parts by weight of dichloromethane. The whole was mixed with stirring at room temperature for 4 hours, thereby preparing a clear solution. The solution was cast on a glass plate and allowed to stand at room temperature for 15 minutes. Next, the solution was peeled off from the glass plate and dried in an oven at 80°C for 10 minutes and then at 120°C for 20 minutes to obtai...

preparation Embodiment 2

[0232] A retardation film B was prepared in the same manner as in Preparation Example 1, except that the stretch ratio was changed from 1.27 times to 1.30 times. Table 2 shows the stretching conditions and properties of the retardation film B obtained.

preparation Embodiment 3

[0234] A retardation film C was prepared in the same manner as in Preparation Example 1, except that the stretching temperature was changed from 147°C to 146°C and the stretching ratio was changed from 1.27 times to 1.25 times. Table 2 shows the stretching conditions and properties of the retardation film C obtained.

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Abstract

The present invention provides 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. 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 styrene-based resin and a polycarbonate-based resin and satisfying the following expressions (1) and (2); and the second optical element has substantially optical isotro. 240nm<=Re(590)<=350nm (1); 0.20<=Rth(590) / Re(590)<=0.80 (2).

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 includes adjusting the light transmittance ( white display) and light shielding (black display) are controlled. A problem with a conventional liquid crystal display device equipped with an IPS mode liquid crystal cell is that the contrast ratio of the screen viewed from an oblique direction (45°, 135°, 225° or 315° in azimuth) at an angle of 45° to the absorption axis of the polarizer will deteriorate. worse. [0003] In order to solve this problem, a method comprising using a refractive index distribution of nx>ny>nz (wherein, nx, ny and nz respectively represen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1335
Inventor 小石直树矢野周治与田健治林政毅
Owner NITTO DENKO CORP
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