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Retardation film, polarizing plate, and liquid crystal display device comprising it

A technology of liquid crystal display devices and retardation films, applied in polarizing elements, optics, instruments, etc., can solve problems such as low wavelength dispersion, refractive index anisotropy, and inability to obtain optical compensation for display liquid crystal display devices, and achieve lightening of color The effect of deviation

Inactive Publication Date: 2010-02-03
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Japanese Patent Application Laid-Open No. 2006-076992 discloses a discotic liquid crystal compound having low wavelength dispersion and large refractive index anisotropy. However, the wavelength dispersion Rth(450) / Rth(550) is 1.1 or more. In this case, it is not possible to obtain a retardation film exhibiting wavelength dispersion necessary for optical compensation of a VA-mode liquid crystal display device.

Method used

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  • Retardation film, polarizing plate, and liquid crystal display device comprising it
  • Retardation film, polarizing plate, and liquid crystal display device comprising it
  • Retardation film, polarizing plate, and liquid crystal display device comprising it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0412]

[0413] (Production of cellulose acetate film (CAF1))

[0414] The following composition was poured into a mixing tank, and stirred while heating to dissolve each component to prepare a cellulose acetate solution.

[0415] Cellulose acetate solution composition

Inner layer (parts by mass)

Outer layer (parts by mass)

Cellulose acetate with a degree of acetylation of 60.9%

100

100

Triphenyl Phosphate (Plasticizer)

7.8

7.8

Diphenyl biphenyl phosphate (plasticizer)

3.9

3.9

Dichloromethane (first solvent)

293

314

Methanol (second solvent)

71

76

1-butanol (the third solvent)

1.5

1.6

Silica particles (AEROSIL R972, Japan

Aerosil Co., Ltd.)

0

0.8

The retardation improving agent represented by the following general formula (A)

1.7

0

[0416] General formula (A)

[0417] delay enhance...

Embodiment 1-2

[0560]

[0561] A commercially available cellulose acetate film (FUJITAC TD80UF, produced by Fujifilm Co., Ltd., film thickness 80 μm) was passed through an induction heating roller at a temperature of 60° C., and the surface temperature of the film was raised to 40° C. / m 2 Coat the alkaline solution A of the following composition, stay for 10 seconds under a steam-type far-infrared heater (manufactured by Noritake Company) heated to 110° C., and use a rod coater in the same manner at 3 ml / m 2 Apply pure water. The film temperature at this time was 40°C. Next, washing with water by a fountain blade coater and water removal by an air knife were repeated three times, and then it was dried in a drying zone at 70° C. for 2 seconds.

[0562] -------------------------------------------------- -------

[0563]

[0564] -------------------------------------------------- -------

[0565] Potassium hydroxide 4.7 parts by mass

[0566] 15.7 parts by mass of water

[0567] 64...

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PUM

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Abstract

The object of the present invention is to provide a novel phase difference film, and a polarizer capable of contributing to alleviate a color shift generating in an oblique direction of a liquid crystal display, and to provide a liquid crystal display device of VA mode alleviated in the color shift depending on the viewing angle when displaying a black color. The phase difference film composed ofa polymer film with an optical anisotropic layer of <=5 [mu]m thickness satisfies following conditions that in-surface retardation Re(550) at wave length of 550 nm is 0 to 10 nm, thickness directionalretardation Rth(550) of the same wave length is 250 to 450 nm, and 1.00<=Rth(450) / Rth(550)<=1.07 is satisfied.

Description

technical field [0001] The invention relates to a novel retardation film, a polarizer and a liquid crystal display device using the same. Background technique [0002] In the past, wide viewing angle liquid crystal methods such as IPS (In-Plane Switching) method, OCB (Optical Compensatory Bend) method, and VA (Vertical Alignment) method have been proposed, and their share has been expanded as the demand for LCD TVs has increased in recent years. . All the methods have improved the display quality, but have not solved the problem of color deviation (chromatic aberration or color fringing) when viewed from an oblique direction. [0003] In order to solve such a color shift problem, an optical compensation method mainly using a negative C-plate compensation film and a positive A-plate compensation film has been disclosed for a VA-type liquid crystal display device. For example, US Pat. No. 4,889,412 discloses a general VA liquid crystal display device using a negative C-plate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/04G02F1/1335
Inventor 福田谦一
Owner FUJIFILM CORP
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