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Optical film, polarizing plate, and liquid crystal display device

A liquid crystal display device, optical film technology, applied in the directions of optics, polarizing elements, optical elements, etc., can solve the problems that have not been raised, and achieve reduced variation in display characteristics, reduced variation in optical compensation performance, and good display characteristics and viewing angle characteristics. Effect

Inactive Publication Date: 2009-10-07
FUJIFILM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the other hand, although various proposals have been made to combine a retardation film made of a predetermined resin with a polarizing plate (Patent Document 2), however, for the conventional optically anisotropic layer having a liquid crystal composition The optical compensation performance of the optical compensation film is equal to or higher than that, and the fluctuation of the optical compensation performance (optimal compensation performance) depending on the change of temperature and humidity can be reduced, and no satisfactory characteristics have been proposed.

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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Embodiment

[0174] Examples are given below to describe the present invention more specifically. Materials, usage amounts, ratios, processing contents, processing procedures and the like shown in the following examples can be appropriately changed unless departing from the gist of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.

[0175] (production of transparent support)

manufacture example 1

[0176] Production Example 1: Production of Transparent Support (PP-0)

[0177] A propylene / ethylene random copolymer (Sumitomo Noblen W151, produced by Sumitomo Chemical Co., Ltd.) containing about 5% by mass of ethylene units was used in a single-screw melt extruder equipped with a T-die in a melt extrusion molding machine at 230 The extrusion molding was carried out at a melting temperature of °C to obtain a green film. Thereafter, corona discharge treatment was given to both the front and back surfaces of this green film, and it was used as a transparent support (PP-0).

manufacture example 2

[0178] Production Example 2: Production of Transparent Support (PP-1)

[0179] A propylene / ethylene random copolymer (Sumitomo Noblen W151, produced by Sumitomo Chemical Co., Ltd.) containing about 5% by mass of ethylene units was used in a single-screw melt extruder equipped with a T-die in a melt extrusion molding machine at 230 The melt temperature of ℃ is carried out extrusion molding, after obtaining raw material film, according to the longitudinal stretching of stretching ratio 1.5 times, the order of transverse stretching that stretching ratio is 1.5 times carries out biaxial stretching successively, obtains Re= 2nm, Rth=95nm transparent stretch ratio bright film. Thereafter, corona discharge treatment was performed on both the front and back surfaces of this transparent film, and it was used as a transparent support (PP-1).

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Abstract

The invention provides an optical film which can be lightened by changes of optical compensative performance caused by changes of temperature and humidity and a polaroid sheet and a liquid crystal display device which can be lightened by changes of display characteristic caused by changes of temperature and humidity. The optical film of the invention comprises a transparent supporting body and optical anisotropy layers located on the transparent supporting body; the optical anisotropy layers are formed by compositions containing liquid crystal compounds; the transparent supporting body is formed by resins containing polypropylene resin; in addition, the polaroid sheet has the optical film and a polaroid film. In addition, the liquid crystal display device at least has liquid crystal units and the polaroid sheet.

Description

technical field [0001] The present invention relates to an optical film, a polarizing plate and a liquid crystal display device using the same. Background technique [0002] Conventionally, various optical compensation films having an optically anisotropic layer composed of a liquid crystal composition on a transparent support made of a polymer film have been proposed as optical films used in optical compensation of liquid crystal display devices ( For example, Patent Document 1). As a transparent support, a triacetyl cellulose (TAC) film is mainly used. [0003] However, liquid crystal display devices are required to be smaller and thinner in applications such as mobile phone applications and notebook personal computer applications. In a liquid crystal display device that has been reduced in size and thickness, the internal temperature often rises excessively due to the heat of the backlight due to long-term use. In addition, liquid crystal display devices for these uses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/04B32B7/02B32B37/12G02B5/30G02F1/1335G02F1/139G02F1/1343
CPCC09K2019/328G02F1/13363G02F2001/133635C09K19/3488C09K2019/0429C09K19/32C09K2323/00G02F1/133635Y10T428/31938
Inventor 永井道夫
Owner FUJIFILM CORP
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