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Liquid crystal display device

A technology for liquid crystal display devices and liquid crystal cells, which is applied to lighting devices, lighting device parts, static indicators, etc., can solve problems such as light leakage and deviation, and achieve the effects of high display quality, excellent contrast, and barrier-free viewing angle characteristics.

Inactive Publication Date: 2012-10-31
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these methods, there are directions (azimuth angles) in which the viewing angle is narrow due to light leakage due to the retardation value of the liquid crystal molecules, deviation of the axis angle at the time of oblique viewing in the polarizing plate, etc.

Method used

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  • Liquid crystal display device
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Examples

Experimental program
Comparison scheme
Effect test

manufacture example

[0087] (1) Manufacture of light diffusion plate

[0088]74.5 parts by mass of styrene-methyl methacrylate copolymer resin (refractive index 1.57), 25 parts by mass of cross-linked polymethyl methacrylate resin particles (refractive index 1.49, weight average particle size 30 μm), 0.5 parts by mass of benzene A triazole-based ultraviolet absorber (“Sumisorb 200” manufactured by Sumitomo Chemical Co., Ltd.) and 0.2 parts by mass of hindered phenolic antioxidant (heat stabilizer) (“IRGANOX 1010” manufactured by Ciba Specialty Chemicals Co., Ltd.) were mixed with Henschel After mixing in the extruder, it is melt-kneaded by the second extruder and supplied to the feed module.

[0089] On the other hand, 99.5 parts by mass of a styrene resin (refractive index 1.59), 0.07 parts by mass of a benzotriazole-based ultraviolet absorber (“Sumisorb 200” manufactured by Sumitomo Chemical Co., Ltd.), and 0.13 parts by mass of a light stabilizer (Ciba Specialty "TINUVIN 770" manufactured by C...

Embodiment 1

[0106] Using the backlight system of the 46-type LCD TV 46ZX8000 manufactured by TOSHIBA Corporation with a direct-type white LED backlight in VA mode as a light source, two prism sheets with a vertex angle of 95° prepared above were placed on the front of the light diffusion plate prepared above. The backlight system was manufactured by arranging them parallel to the short side and the long side of the backlight so that the grooves of the prism sheet were at right angles to each other, and the following light distribution characteristics were measured for each module.

[0107] Light distribution characteristics

[0108] Such as Figure 13 As shown in (a), assign numbers to the modules, only the central module B0 is displayed in white, and the remaining modules B1 to B12 are all set to be displayed in black. Moreover, for each of the modules B1 to B12, when the viewing angles formed with the normal direction as shown in (b) of the figure are 0°, 30°, and 70°, the directly abo...

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Abstract

Disclosed is a liquid crystal display device which has achieved display with wide viewing angle and high color reproducibility, while having excellent contrast. In addition, the liquid crystal display device has enlarged viewing angle without using a retardation plate. Specifically disclosed is a liquid crystal display device which comprises a liquid crystal cell (1), a back light device (2), a first light diffusion layer (3), a first polarizing plate (4) and a second light diffusion layer (5). The first light diffusion layer (3) comprises a light diffusion plate (31) and a prism sheet (32). The first light diffusion layer (3) has such an alignment characteristic that the luminance value in a direction that is at 70 DEG to the normal of the light incident surface of the liquid crystal cell is 20% or less of the luminance value in the normal direction. The second light diffusion layer (5) is configured of a second polarizing plate (51) and a light diffusion film (52). The back light device (2) is divided into a plurality of regions, and the luminance of each region can be controlled independently.

Description

technical field [0001] The present invention relates to a liquid crystal display device, and more specifically, to a liquid crystal display device excellent in viewing angle characteristics. Background technique [0002] In recent years, liquid crystal display devices have been widely used in portable electronic devices such as mobile phones and PDAs (Personal Digital Assistants) to large electrical devices such as personal computers and televisions, and their applications are expanding. [0003] Unlike self-luminous display devices such as CRTs and PDPs (Plasma Display Panels), liquid crystal display devices do not emit light themselves. Therefore, in a transmissive liquid crystal display device, a backlight device is provided on the back side of the liquid crystal display element, and the liquid crystal display element displays an image by controlling the amount of transmitted illumination light from the backlight device for each pixel. [0004] There are various types of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357F21S2/00F21V3/00F21V5/00F21V5/02G02F1/133F21Y101/02
CPCG02F1/133606G02F1/133504G02B6/0053G02B6/0056G02F2001/133507G02B6/0051G02B6/008G02F1/133507
Inventor 金光昭佳宫本知典山原基裕羽场康弘
Owner SUMITOMO CHEM CO LTD