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Optical film, optical compensation film, polarizing plate, liquid crystal display unit, and self luminous display unit

A technology of optical compensation film and optical film, which is applied in the field of optical film, can solve problems such as reducing optical anisotropy, achieve the effects of improving observation angle characteristics, reducing surface inhomogeneity, and improving optical characteristics

Active Publication Date: 2007-05-02
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, it is not sufficient to merely reduce the optical anisotropy as described above

Method used

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  • Optical film, optical compensation film, polarizing plate, liquid crystal display unit, and self luminous display unit
  • Optical film, optical compensation film, polarizing plate, liquid crystal display unit, and self luminous display unit
  • Optical film, optical compensation film, polarizing plate, liquid crystal display unit, and self luminous display unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0344] [Method for producing cellulose acylate film]

[0345] [Dissolution step]

[0346] In preparing the cellulose acylate solution (dope) of the present invention, the cellulose acylate is dissolved by any method without limitation, ie, room temperature dissolution, cooling dissolution, heat dissolution or a combination thereof. Regarding the preparation of the cellulose acylate solution of the present invention, the solution concentration at the time of dissolution and filtration is preferably used as described in, for example, Japan Institute of Invention and Innovation Journal of Technical Disclosure No. 2001-1745 (2001.03.15, Japan Institute of Invention and Innovation), Methods on pages 22-25.

[0347] (transparency of dope)

[0348] It is preferable that the dope transparency of the cellulose acylate solution of the present invention is 85% or higher, more preferably 88% or higher, more preferably 90% or higher. In the present invention, it has been confirmed that ...

Embodiment

[0479] (manufacturing of cellulose acetate film)

[0480] The composition shown below was put into a mixing tank and stirred under heating to dissolve each component to obtain a cellulose acetate solution A.

[0481]

[0482] 100 parts by mass of cellulose acetate with a degree of substitution of 2.85

[0483] 7.8 parts by mass of triphenyl phosphate (plasticizer)

[0484] 3.9 parts by mass of biphenyl diphenyl phosphate (plasticizer)

[0485] Dichloromethane (first solvent) 300 parts by mass

[0486] Methanol (the second solvent) 54 parts by mass

[0487] 11 parts by mass of 1-butanol

[0488] Add the following composition to another mixing tank, stir under heating, dissolve each component, and obtain additive solutions B-1 to B-4.

[0489] [Table 1]

[0490] additive solution

Dichloromethane

(parts by mass)

Methanol

(parts by mass)

Optical Anisotropy-Reducing Agent

(A-29)

(parts by mass)

wavelength dispersion c...

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PUM

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Abstract

An optical film which has Re(lambda) and Rth(lambda) fulfilling the following two formulae: 0<=RE(590)<=10 |RTH(590)||<=25 wherein Re(lambda) is a retardation value in plane (nm) at a wavelength of lambdanm; and Rth(lambda) is a retardation value in film thickness direction (nm) at a wavelength of lambdanm.

Description

technical field [0001] The invention relates to an optical film used in a liquid crystal display unit. The present invention also relates to an optical material such as an optical compensation film, a polarizing plate using the same, and a display unit. Background technique [0002] Since cellulose acylate films have excellent toughness and flame retardancy, they have been used in photographic supports and various optical materials. In recent years, especially cellulose acylate films have been frequently used as optically transparent films for liquid crystal display units. The cellulose acylate film is preferably used as an optical material for a unit utilizing polarization such as a liquid crystal display unit because of high optical transparency and high optical isotropy. Therefore, the cellulose acylate film has been used as an optical compensation film support, thereby compensating for a display viewed from a certain angle (observation angle compensation). [0003] Th...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/13363H05B33/02H05B33/14
Inventor 二村惠朗中山元西浦阳介伊藤忠椋木康雄
Owner FUJIFILM CORP