Optical compensation film, preparation method thereof, polarizer and liquid crystal display device

An optical compensation film, optical technology, applied in chemical instruments and methods, optics, polarizing elements, etc., can solve the problems of poor working performance of polarizers, light leakage, narrowing of the viewing angle, etc., and achieve the effect of expanding the viewing angle and reducing the color shift.

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

AI Technical Summary

Problems solved by technology

[0004] However, in the VA mode, a substantially completely black display can be obtained in the normal direction of the panel, but there is a problem that when the panel is viewed from an oblique direction, light leakage occurs, thereby narrowing the viewing angle
[0006] However, in the aforementioned methods, any implementation means using polymers other than polycarbonate has not been found, and there are problems in that the photoelastic coefficient is large and the workability of the polarizing plate is poor.
When fine particles are added to the film, there is a problem that the haze becomes high, whereby the transparency of the film decreases

Method used

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  • Optical compensation film, preparation method thereof, polarizer and liquid crystal display device
  • Optical compensation film, preparation method thereof, polarizer and liquid crystal display device
  • Optical compensation film, preparation method thereof, polarizer and liquid crystal display device

Examples

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preparation example Construction

[0212] In general, examples of drying the dope on a metal support according to the production of cellulose acylate film include a method of blowing hot air from the surface side of the metal support (drum or belt) (i.e., from the film sheet (web) side on the metal support) ; the method of blowing hot air from the back of the cylinder or belt; and the method of controlling the surface temperature by contacting the temperature control liquid with the back of the belt or cylinder (the surface opposite to the dope casting surface) and heating the cylinder or belt due to heat conduction Backside liquid heat conduction method. Among these methods, the back liquid heat conduction method is preferable. The surface temperature of the metal support before casting may be arbitrary as long as it is not higher than the boiling point of the solvent used in the dope. However, in order to accelerate drying or reduce fluidity on the metal support, it is preferable that the surface temperature o...

Embodiment 1

[0339] Preparation of Cellulose Acylate Film Sample 102

[0340] (Preparation of cellulose acetate solution 102)

[0341] A cellulose acetate solution was prepared by pouring the following composition into a mixing tank and stirring to dissolve the components.

[0342] Cellulose acetate (degree of substitution: 2.86): 100.0 parts by mass

[0343] ●Triphenyl phosphate: 6.3 parts by mass

[0344] ●Diphenyl phosphate: 5.0 parts by mass

[0345] ●Dichloromethane: 366.5 parts by mass

[0346] Methanol: 54.8 parts by mass

[0347] (Preparation of Matting Agent Dispersion 102)

[0348] The following composition was put into a disperser and stirred to dissolve the components, thereby preparing a matting agent solution.

[0349] ●Silicon dioxide particles with an average particle size of 20 nm (AEROSIL 2.0 parts by mass

[0350] R972, manufactured by Nippon Aerosil Co. Ltd.):

[0351] ●Dichloromethane: 76.3 parts by mass

[0352] Methanol: 11.4 parts by mass

[0353] ●Cellu...

Embodiment 2

[0367] Preparation of Cellulose Acylate Film Sample 103

[0368] (Preparation of additive solution 103)

[0369] Additive solutions were prepared by pouring the following compositions into a mixing tank and stirring to dissolve the components.

[0370] ●Illustrative compound (104): 10.0 parts by mass

[0371] ●Dichloromethane: 36.8 parts by mass

[0372] Methanol: 5.5 parts by mass

[0373] ●Cellulose acetate solution 101: 12.8 parts by mass

[0374] (processing)

[0375] The aforementioned cellulose acetate solution and the additive solution were mixed in the following proportions to prepare a dope for processing. The same dope as that of sample 102 was used as the dope of the surface layer.

[0376] (Preparation of dope 103 for processing)

[0377] The following composition was put into a mixing tank and stirred, and each component was adjusted to have a ratio described later and mixed and dissolved, thereby preparing a dope for processing.

[0378] ●Cellulose acet...

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Abstract

An optical compensation film with optically biaxial properties, wherein the longer the wavelength is, the larger the wavelength dispersion of a retardation Re in an in-plane direction and a retardation Rth in a thickness direction against light in a visible light region is; the film contains at least one inorganic particle; a concentration of the inorganic particle in a film surface layer is from 0.05% to 1.0%; an average concentration of the inorganic particle in the film is from 0.01% to 0.3%; and the concentration of the inorganic particle in the surface layer is larger than the average concentration of the inorganic particle in the film.

Description

technical field [0001] The invention relates to an optical compensation film, a preparation method of the optical compensation film, a polarizer and a liquid crystal display device. Background technique [0002] Liquid crystal display devices are widely used for monitors of personal computers and mobile devices and for televisions due to various advantages that miniaturization and thinning can be achieved at low voltage and low power consumption. In such a liquid crystal display device, various modes have been proposed depending on the alignment state of liquid crystal molecules within a liquid crystal cell. The TN mode in which a twisted alignment state of about 90° is exhibited from the lower substrate to the upper substrate of the liquid crystal cell has been the mainstream until now. [0003] In general, a liquid crystal display device is composed of an optical compensation sheet and a polarizer. The optical compensation sheet is used for the purpose of overcoming imag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCB32B23/08C09K19/3068C09K19/3497G02B5/3083Y10T428/24942B32B27/30C09K19/3491B32B23/14Y10T428/1041C09K2323/031G02B5/30G02F1/13363C08J5/18
Inventor 池田显樱泽守
Owner FUJIFILM CORP
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