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Polarizing plate and liquid crystal display device

A technology of liquid crystal display devices and polarizers, which is applied in the directions of polarizing elements, transportation and packaging, thin material processing, etc., and can solve the problems of large display device size and demanding viewing angle dependence

Active Publication Date: 2008-09-24
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid crystal display devices used in televisions are large in size and are expected to be viewed at multiple angles, and have strict requirements for viewing angle dependence, and even the above-mentioned technologies cannot meet this stringent requirement

Method used

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  • Polarizing plate and liquid crystal display device
  • Polarizing plate and liquid crystal display device
  • Polarizing plate and liquid crystal display device

Examples

Experimental program
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Effect test

preparation example Construction

[0289] [Preparation of dope]

[0290] The preparation of the solution (dope) for casting and coating the cellulose acylate will be described below.

[0291] The method of dissolving the cellulose acylate is not particularly limited, and the dissolution can be performed by a room temperature dissolution method, a cooling dissolution method, a high temperature dissolution method, or a combination thereof. As for dissolution, for example JP-A-5-163301, JP-A-61-106628, JP-A-58-127737, JP-A-9-95544, JP-A-10-95854, JP-A-10 -45950, JP-A-2000-53784, JP-A-11-322946, JP-A-11-322947, JP-A-2-276830, JP-A-2000-273239, JP-A-11-71463 JP-A-4-259511, JP-A-2000-273184, JP-A-11-323017, and JP-A-11-302388 describe methods as methods for preparing cellulose acylate solutions.

[0292] In these methods of dissolving cellulose acylate in an organic solvent, techniques within the scope of the present invention can be suitably used. Hatsumei Kyokai Kokai Giho Kogi No. 2001-1745 (published by Hatsumei Kyok...

Embodiment 1

[0478] [Example 1: Formation of a cellulose acylate film (film 1-7) using a band casting machine]

[0479] (1) Cellulose acylate

[0480] Cellulose acylates having various acyl groups and different degrees of substitution as shown in Table 1 were prepared. The acylation reaction was carried out by adding sulfuric acid (7.8 parts by weight per 100 parts by weight of cellulose) as a catalyst and a carboxylic acid as a raw material for the acyl substituent, and the reaction was carried out at 40°C. In this case, the type and degree of substitution of the acyl group are controlled by adjusting the type and amount of carboxylic acid. After acylation, ripening was carried out at 40°C. In addition, it was washed with acetone to remove low molecular weight components of cellulose acylate. In addition, in the table, CAB is an abbreviation for cellulose acetate butyrate (a cellulose ester derivative in which the acyl group contains an acetyl and butyryl group), and CAP is cellulose acetate ...

Embodiment 2

[0492] [Example 2: Preparation of protective film (film 8) of two-layer structure]

[0493] The polyimide synthesized from 2,2'-bis(3,4-dihydroxyphenyl)hexafluoropropane and 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl In cyclohexanone, a 15% by mass solution was prepared. The polyimide solution thus prepared was applied to "FUJI TAC TD80UL" (manufactured by Fuji Photo Film Co., Ltd.) as a base film so that the film thickness after drying reached 3.5 μm, and dried at 150°C for 5 minutes, By using a tenter to stretch 13% in the width direction under an environment of 150°C, and then relax by 2% in the width direction, both ends are clamped before the roll-up part, so that the roll film has A width of 1474 mm and a length of 3800 m were then rolled up, thereby obtaining a film 8. The thickness of the film 8 is 75 μm. The Re retardation value and the Rth retardation value of the film 8 were measured by using KOBRA 2IADH (manufactured by Oji Scientific Instruments) at wavelengths of...

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Abstract

A polarizing plate comprising at least one protective film; and a polarizing film, wherein the protective film disposed on a liquid crystal cell side has Re(lambda) and Rth(lambda) satisfying the conditions of 45nm=Re(590)=65nm and 150nm=Rth(590)=240nm, and the polarizing plate gives, when disposed in an orthogonal position, a hue a* and a hue b* of the polarizing plate disposed in an orthogonal position satisfying the formulae -1.0=a*=2.0 and -1.0=b*=2.0 (wherein Re(lambda) represents a retardation value in plane at a wavelength of lambda nm (unit: nm), and Rth(lambda) represents a retardation value along a thickness of the film (unit: nm)).

Description

Technical field [0001] The present invention relates to a polarizing plate that reduces the color shift of a liquid crystal display device under black display under the condition of changing the viewing angle, and a liquid crystal display device using the polarizing plate. Background technique [0002] Liquid crystal display devices are widely used as displays for personal computers or mobile devices and televisions due to their various advantages such as being able to operate at low voltage, low power consumption, and reduced thickness. For such liquid crystal display devices, various modes of liquid crystal display devices have been proposed, and the alignment states of the liquid crystal molecules in the liquid crystal elements are different from each other. The TN mode is the main mode so far, in which the molecules are in an orientation state that is twisted by about 90° from the lower substrate of the liquid crystal cell to the upper substrate. [0003] The liquid crystal d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335G02F1/13363
CPCG02B5/3083G02B1/105G02F2001/133635G02F1/13363G02F1/133528Y10T428/1041G02B1/14C09K2323/031G02F1/133635
Inventor 纲中英一郎
Owner FUJIFILM CORP
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