Optical film, polarizing plate, and liquid crystal display device

A liquid crystal display device and optical film technology, applied in the field of optical films, can solve problems such as humidity difference, achieve high reliability, and improve the effect of circular or elliptical light unevenness

Inactive Publication Date: 2015-01-14
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The generation mechanism of the above-mentioned light unevenness is still unclear, but as one of the reasons, it can be cited that the diffusion plate on the backlight side is in contact with the liquid crystal panel (especially the polarizing plate on the backlight side) in a high-temperature and high-humidity environment. Creates a humidity difference between the contact area and other areas

Method used

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

Examples

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preparation example Construction

[0458] In the preparation of the dope solution, the method of dissolving the dope solution is not particularly limited, and can be carried out at room temperature, and further carried out by a cooling dissolution method or a high temperature dissolution method, or a combination of these methods. Regarding the preparation of the dope solution in the present invention, and then the steps of concentration and filtration of the solution accompanied by the dissolution step, it is preferable to use the published technical bulletin of the Association of Inventions (public technical number 2001-1745, issued on March 15, 2001, invention Association) describes the manufacturing steps on pages 22 to 25 in detail.

[0459] (casting step, drying step, coiling step)

[0460] Next, a method for producing a membrane using a dope solution will be described. The method and equipment for producing the optical film of the present invention can use the solution casting film forming method and the...

Embodiment 1～ Embodiment 20、 comparative example 1～ comparative example 9

[0533] (1) Preparation of cellulose acylate resin by synthesis

[0534] Sulfuric acid (7.8 parts by mass with respect to 100 parts by mass of cellulose) was added as a catalyst, and acetic acid was added to perform an acylation reaction at 40°C.

[0535] Thereafter, the total substitution degree and the 6-position substitution degree were prepared by adjusting the sulfuric acid catalyst amount, moisture content and aging time. The acyl substitution degree of cellulose acylate was obtained by using the method described in "Carbohydr. Res." 273 (1995) 83-91 (Tezuka et al.). 13 C-NMR to obtain.

[0536] The aging temperature was 40°C. Furthermore, the low molecular weight component of the said cellulose acylate was washed and removed with acetone. The number average molecular weight of the obtained cellulose acylate was 96,000, and the weight average molecular weight was 260,000.

[0537] (2) Dope preparation

[0538] (Preparation of Cellulose Acylate Solution)

[0539] The...

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Abstract

An optical film which has a film thickness of 15-45 mum, satisfies formulae (1) and (2) after a 48-hour wet heat treatment at 60°C and a relative humidity of 90%, and has a dimensional change of ±0.3% or less after a 24-hour treatment at 60°C and a relative humidity of 90%. This optical film is capable of suppressing occurrence of circular or elliptical light unevenness in the display surface when applied to a thin liquid crystal display device. (Rth (440 W, 30% RH) represents the retardation value in the film thickness direction at a wavelength of 440 nm as measured at 25°C and a relative humidity of 30%, and Rth (440 W, 80% RH) represents the retardation value in the film thickness direction at a wavelength of 440 nm as measured at 25°C and a relative humidity of 80%) Formula (1): -20 nm <= Rth (440 W, 30% RH) <= 5 nm Formula (2): 0 nm <= Rth (440 W, 30% RH) - Rth (440 W, 80% RH) <= 18 nm

Description

technical field [0001] The present invention relates to an optical film capable of suppressing light unevenness in a liquid crystal display device, a polarizing plate and a liquid crystal display device using the optical film. Background technique [0002] In silver halide photographic photosensitive materials, retardation films, polarizing plates and image display devices, cellulose ester, polyester, polycarbonate, cycloolefin polymer vinyl polymer [, vinyl polymer], and poly Polymer films represented by imide and the like. Since a film more excellent in planarity or uniformity can be produced from these polymers, it is widely used as a film for optical applications. [0003] When this kind of film is used for optical applications such as retardation film, support body of retardation film, polarizing plate protective film, and liquid crystal display device, the control of its optical anisotropy plays an important role in determining the performance of the display device (s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C08J5/18G02F1/1335G02F1/13363
CPCG02F2202/40G02F1/13363C08J7/04G02B5/3083G02B5/3025G02F1/133528C08J5/18G02B5/30G02F1/1335G02B1/08G02F1/134363
Inventor 久门义明名仓正人野口淳久永和也深川伸隆内藤游古川裕道
Owner FUJIFILM CORP
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