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Optical compensation film, polarizing plate and liquid crystal display device

An optical compensation film, liquid crystal technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of changing optical compensation performance, changing the optical compensation performance of cellulose ester film, etc.

Active Publication Date: 2008-03-26
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, liquid crystal displays have been increasingly used in various environments, and changing the optical compensation properties of cellulose ester films using the above-mentioned techniques in these environments has become a problem
More specifically, the problem is that these cellulose ester films are affected by environmental changes, especially humidity, especially when they are stacked on liquid crystal cells, so that their Re retardation value and Rth retardation value change, making the optical Compensation for performance changes

Method used

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  • Optical compensation film, polarizing plate and liquid crystal display device
  • Optical compensation film, polarizing plate and liquid crystal display device
  • Optical compensation film, polarizing plate and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0577] 1. Formation of cellulose acylate film

[0578] (1) Cellulose acylate

[0579] Cellulose acylate having different acyl substitution degrees shown in Table 1-1 was prepared. More specifically, sulfuric acid was added as a catalyst (7.8 parts by mass / 100 parts by mass of cellulose) in addition to the carboxylic acid, and the acylation reaction was performed at 40°C. Subsequently, the total substitution degree and the 6-position substitution degree were adjusted by controlling the sulfuric acid catalyst content, water content and aging time. Aging was performed at 40°C. In addition, low molecular weight components in the obtained cellulose acylate were washed away with acetone.

[0580] (2) Dope preparation

[0581] To the cellulose acylate shown in Table 1-1, a plasticizer (a 2:1 mixture of triphenyl phosphate and biphenyl diphenyl phosphate), a retarder having the structure shown below was added under stirring. An expression agent and a mixed solvent (87:13 mass rat...

Embodiment 2

[0644] 1. Formation of cellulose acylate film

[0645] (1) Cellulose acylate

[0646] Cellulose acylate having different acyl substitution degrees shown in Table 2-1 was prepared. More specifically, sulfuric acid (7.8 parts by mass / 100 parts by mass of cellulose) was added as a catalyst in addition to the carboxylic acid, and the acylation reaction was performed at 40°C. Subsequently, the total substitution degree and the 6-position substitution degree were adjusted by controlling the sulfuric acid catalyst content, water content and aging time. Aging was performed at 40°C. In addition, low molecular weight components in the obtained cellulose acylate were washed away with acetone.

[0647] (2) Dope preparation

[0648] To each of the cellulose acylates shown in Table 2-1, was added a plasticizer (a 2:1 mixture of triphenyl phosphate and biphenyl diphenyl phosphate), a plasticizer having the structure shown below, under stirring. The delayed expressing agent and the mixed...

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Abstract

An optical compensation film is provided and has a cellulose acylate film coated with an optically anisotropic layer containing a liquid crystalline compound, cellulose having a glucose unit, a hydroxyl group of the glucose unit being substituted with an acyl group having at least two carbon atoms. The cellulose acylate film satisfies relationships specified in the specification.

Description

technical field [0001] The invention relates to an optical compensation film, and a polarizer and a liquid crystal display each using the optical compensation film. Background technique [0002] Liquid crystal displays are widely used in a variety of applications including personal computers, mobile device monitors, and televisions due to their various advantages, such as the ability to operate at low voltage and low power consumption, and high possibility of size and shape reduction . Although various modes have been proposed for such liquid crystal displays depending on how the liquid crystal molecules are oriented in the liquid crystal cell, the main mode so far has been the TN mode in which the orientation state of the liquid crystal molecules is twisted from the lower substrate to the upper substrate about 90°. [0003] Generally, a liquid crystal display is composed of a liquid crystal cell, an optical compensation film, and a polarizer. The optical compensation fil...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/13363C08J7/04
Inventor 伊藤洋士中村亮
Owner FUJIFILM CORP
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