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Optically compensating film, polarzingplate and apparatus for displaying images

A technology of optical compensation film and polarizing plate, which is applied in the direction of optics, polarizing elements, optical elements, etc., and can solve problems such as the reduction of optical properties of polarizing films

Inactive Publication Date: 2004-06-30
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the optical compensation film that functions as a protective film is permeable to water under conditions of high temperature and high humidity, and the optical characteristics of the polarizing film are sometimes degraded by the permeated water

Method used

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  • Optically compensating film, polarzingplate and apparatus for displaying images
  • Optically compensating film, polarzingplate and apparatus for displaying images
  • Optically compensating film, polarzingplate and apparatus for displaying images

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] [Preparation of polymer film]

[0101] A composition containing 100 parts by weight of "ZEONOR 1020R" (supplied by ZEON Corporation) and 200 parts by weight of methylene chloride was placed in a mixing tank, and heated and stirred, thereby obtaining a polymer solution. On the other hand, a composition containing 16 parts by weight of a retardation controlling agent shown below and 100 parts by weight of methylene chloride was put into another mixing tank, heated and stirred, whereby a retardation controlling agent solution was obtained. 474 parts by weight of this polymer solution and 63 parts by weight of a retardation controller solution were added and mixed with sufficient stirring, whereby a dope was obtained. The retardation control agent was added in an amount of 5.5 parts by weight based on 100 parts by weight of the polymer ("ZEONOR 1020R").

[0102] delay control agent

[0103]

[0104] The dope is cast onto a belt of a caster to form a film. When the amo...

Embodiment 2

[0117] [Preparation of polymer film]

[0118] A composition containing 150 parts by weight of "ZEONOR 1020R" (supplied by ZEON Corporation) and 350 parts by weight of methylene chloride was placed in a mixing tank, and heated and stirred, thereby obtaining a polymer solution. 36 parts by weight of the same retardation control agent as used in Example 1 was added to 474 parts by weight of this polymer solution, and mixed with sufficient stirring, whereby a dope was obtained. The retardation control agent was added in an amount of 3.5 parts by weight based on 100 parts of the polymer ("ZEONOR 1020R").

[0119] The dope is cast onto a belt of a caster to form a film. The film was left on the tape by making the film surface temperature 40°C, followed by drying with hot air at 70°C for 1 minute, and peeled off from the tape. The resulting film was dried with hot air at 140°C for 10 minutes. Thus, a polymer film PF-02 having a thickness of 50 μm and containing 0.3 wt.% of residua...

Embodiment 3

[0127] [Preparation of polymer film]

[0128] A composition containing 100 parts by weight of "ZEONOR 1020R" (provided by ZEON), 300 parts by weight of methylene chloride and 30 parts by weight of boron nitride powder was put into a mixing tank, and heated and stirred to obtain a polymer solution. 36 parts by weight of the same retardation control agent as used in Example 1 was added to 474 parts by weight of this polymer solution, and mixed with sufficient stirring, whereby a dope was obtained. The retardation control agent was added in an amount of 3.5 parts by weight based on 100 parts of the polymer ("ZEONOR 1020R").

[0129] A polymer film PF-03 having a thickness of 50 µm was produced in the same manner as in Example 2 except that the dopes used were different from each other.

[0130] The thermal conductivity of the obtained polymer film PF-03 was 1.2 W / (m·K). Various optical properties were measured as in Example 1. The results are listed in Table 1.

[0131] (for...

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Abstract

The invention discloses an optical compensation film, which comprises: a polymer film, the film has a retardation value Re(=(nx-ny)×d) of 0-100nm and a retardation value Rth(={ (nx+ny) / 2−nz}×d); and an optically anisotropic layer formed of a liquid crystal compound. The polymer film has a photoelastic coefficient of 10×10 －12 m 2 / N or lower and the water vapor permeability measured in accordance with the JISZ0208 method is 1g / (m 2 24hrs) or lower 70-500nm polymer formation. The invention also discloses a polarizer and equipment including the optical compensation film.

Description

technical field [0001] The present invention relates to light-weight and durable optical compensation films, polarizing plates, and devices using them for displaying images. Background technique [0002] Since liquid crystal displays (LCDs) are required to be thinner than CRTs, lighter in weight, or work with less power, they are used in various devices such as laptop computers, monitors, televisions, personal digital assistants (PDAs), cordless phones, and car navigation systems. And cameras are used instead of CRT. However, current standard TN-type LCDs have the drawback that the color or contrast on the display varies depending on the direction in which the LCD is viewed. [0003] In Japanese Patent No. 2,587,398, an LCD providing high visual quality with improved viewing angle is disclosed, an optical compensation film made of discotic liquid crystals oriented in hybrid orientation is interposed between the polarizing plate and the liquid crystal...

Claims

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Application Information

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IPC IPC(8): C08K3/00C08K5/3492C08L65/00C08L101/12G02B5/30G02F1/13363G09F9/00
CPCG02B5/3016G02B5/3033G02F1/1335G02F1/13363
Inventor 中村卓伊藤洋士
Owner FUJIFILM CORP