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Liquid crystal display apparatus and polarizing panel group

A technology of liquid crystal display devices and polarizers, applied in optics, polarizing elements, nonlinear optics, etc., can solve problems such as decreased contrast, achieve high contrast, suppress light leakage, and increase contrast viewing angles

Active Publication Date: 2008-09-24
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anti-glare film showing a high haze value of 10% or more has a problem that the contrast ratio measured in a bright room decreases due to its broad reflection and scattering characteristics.
In addition, there is also a problem that the contrast ratio measured in a dark room, which is inherent in liquid crystal display devices, decreases.

Method used

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  • Liquid crystal display apparatus and polarizing panel group
  • Liquid crystal display apparatus and polarizing panel group
  • Liquid crystal display apparatus and polarizing panel group

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0177] (a) Mold making

[0178] The surface of an aluminum roll (A5056 according to JIS) having a diameter of 300 mm was mirror-polished. On the outer surface of the obtained mirror-polished aluminum roller, zirconia microbeads manufactured by Tosoh Corporation were sprayed at a spray pressure of 0.1 MPa (gauge pressure, the same below) using a spray device (obtained from Fuji Manufacturing Co., Ltd.) TZ-SX-17" (trade name, average particle size 20 μm), forming irregularities on the surface. Electroless glossy nickel plating was performed on the obtained aluminum roll with irregularities, and a mold was made. The thickness of the coating was set at 12 μm, The thickness of the plating layer after plating was measured using a β-ray film thickness measuring device (trade name "Fisher Coup MMS", available from Fisher Instruments Co., Ltd.), and found to be 12.3 μm.

[0179] (b) Production of anti-glare film

[0180] The photocurable resin composition "GRANDIC 806T" (trade name) ...

Embodiment 2

[0219] In the above-mentioned examples, as the front side polarizing plate, the anti-glare film produced by the same method as (b) of Example 1 was directly attached to the viewing side surface of the polyvinyl alcohol-iodine type linear polarizer. The same liquid crystal display device was fabricated using a polarizing plate obtained by using the protective film with its concave-convex surface on the outside, and the same results as in Example 1 were obtained.

Embodiment 3 and 4

[0221] The thickness of the plating layer was changed as shown in Table 2, and a mold having unevenness on the surface was produced in the same manner as in (a) of Example 1. Using each mold, a transparent anti-glare film composed of a laminate of a cured resin having unevenness on the surface and a TAC film was produced in the same manner as in Example 1 (b). The optical characteristics and surface shape (average area of ​​Voronoi polygons) of the obtained antiglare film are shown in Table 2. In addition, for each film, the number of vertices of the protrusions, the arithmetic mean height Pa of the profile curve, the maximum profile height Pt, and the peak position of the histogram of the elevation were obtained in the same manner as in Example 1. The results are shown in Table 3. In addition, using these films, a liquid crystal display device with an anti-glare layer was produced in the same manner as in Example 1 (c) to (e), and the contrast and the anti-glare layer were ev...

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Abstract

Polarization plates (20, 30) are configured at two sides of a liquid plasma panel (10) of IPS mode. A phase separation plate (40) is configured between a polarization plate (20) at back side and the liquid plasma panel (10); the sum of phase difference Rth at the thickness direction of a double refraction layer existed between one side of the liquid plasma surface a polarizer (21) at back side and a base plate (11) surface at back side of the liquid plasma panel (10) is in the range of -40 nm to +40 nm as well as the sum R0 of the plane phase difference is in the range of 100 nm to 300 nm. A polarization plate (31) at the front side includes a polarizer (31) and a transparent protective layer (33) at visual side; the phase difference Rth at the thickness direction between the side plane of the liquid plasma panel of the polarizer (31) and the surface of a base plate (13) at the front side of the liquid plasma panel (10) is in the range of -10 nm to +40 nm; the transparent protective layer (33) at visual side includes a glare-proof layer (50) whose surface is provided with a fine concavo convex satisfied wtih the ruled optical feature.

Description

technical field [0001] The present invention relates to a liquid crystal display device with improved antiglare property and a polarizing plate group useful therefor. Background technique [0002] Liquid crystal display devices are characterized by light weight, thin profile, and low power consumption, and thus are used in portable televisions, notebook computers, and the like. At present, it is also used in video viewing devices such as large TVs. In a liquid crystal display device used for displaying images such as a television receiver, visibility, especially the contrast ratio when viewed from the front and the contrast ratio when viewed from an oblique direction, that is, viewing angle characteristics are important. In order to improve the above-mentioned viewing angle characteristics, various liquid crystal panel drive modes have been proposed. [0003] As the driving mode of the liquid crystal panel that can essentially expand the viewing angle, for example, optical...

Claims

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Application Information

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IPC IPC(8): G02F1/1335G02B5/30
CPCG02F1/133528G02F1/13363G02F1/134363G09G2320/02
Inventor 古谷勉冈村麻利矢可部公彦
Owner SUMITOMO CHEM CO LTD
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