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Lc panel and LCD device

A technology of liquid crystal panels and liquid crystal units, applied in nonlinear optics, instruments, optics, etc., to achieve good display performance, prevent unevenness of phase difference, and small photoelastic coefficient

Inactive Publication Date: 2006-04-26
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

[0226]Phosgene is used 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 polycarbonate resin (number) having a weight average molecular weight (Mw) of 60,000 and containing repeating units represented by the following formulas (5) and (6) by conventional methods. The average molecular weight (Mn) is 33,000, Mw / Mn is 1.78, and the weight ratio (A):(B) is 4:6). 70 parts by weight of polycarbonate resin and 30 parts by weight of styrene resin (HIMER SB75, Sanyo Chemical Industries) having a weight average molecular weight (Mw) of 1,300 (number average molecular weight (Mn) of 716, Mw / Mn of 1.78) , Ltd. (manufactured by Sanyo Chemical Industry Co., Ltd.) was added to 300 parts by weight of methylene chloride. The whole was stirred and mixed for 4 hours at room temperature to prepare a clear solution. The solution was cast on a glass plate and t...

preparation Embodiment 2

[0235] The 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 obtained retardation film B.

preparation Embodiment 3

[0237] The 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 obtained retardation film C.

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Abstract

The present invention provides a liquid crystal panel having improved oblique contrast and good display uniformity without shifting or unevenness in retardation values ​​due to shrinkage stress of a polarizer or heat of a backlight. A liquid crystal panel according to an embodiment of the present invention includes a liquid crystal unit, polarizers arranged on both sides of the liquid crystal unit, a first optical element arranged between one polarizer and the liquid crystal unit, and a first optical element arranged between the other polarizer and the liquid crystal unit. The second optical element, wherein the first optical element includes a retardation film containing a styrene-based resin and a polycarbonate-based resin and satisfies the following expressions (1) and (2), and the second optical element substantially has an optical isotropy Same sex: 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 having a liquid crystal cell, a polarizer and an optical element. In addition, the present invention relates to a liquid crystal television and a liquid crystal display device that both use the liquid crystal panel. Background technique [0002] A liquid crystal display device equipped with an in-plane switching (IPS) mode liquid crystal cell includes rotation of the liquid crystal molecules by approximately 45° by applying a horizontal electric field to liquid crystal molecules that are substantially horizontally aligned without applying an electric field, thereby increasing the light transmittance ( White display) and light shielding (black display) are controlled. The problem with the conventional liquid crystal display device equipped with an IPS mode liquid crystal cell is that the contrast of the screen viewed from an oblique direction (azimuth angle of 45°, 135°, 225° or 315°) at an angle of 45° to the ...

Claims

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Application Information

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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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