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Optical resin film and polarizing plate and liquid crystal display using same

A liquid crystal display, optical resin technology, applied in optics, optical components, nonlinear optics, etc., can solve the problems of light leakage angle of view, inability to improve chromatic aberration, narrowing, etc.

Active Publication Date: 2007-02-21
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the VA mode suffers from the problem that although it provides an almost completely black display in the normal direction of the panel, light leakage occurs when the panel is viewed from an angle so that the viewing angle becomes narrow
[0007] However, the chromatic aberration discussed above cannot be improved even by using the thermoplastic resin film reported in Japanese Patent No. 3273046

Method used

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  • Optical resin film and polarizing plate and liquid crystal display using same
  • Optical resin film and polarizing plate and liquid crystal display using same
  • Optical resin film and polarizing plate and liquid crystal display using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0356] (formation of film 1)

[0357] To 60 parts of 6-methyl-1,4,5,8-dioxomethylene-1,4,4a,5,6,7,8,8a-octahydronaphthalene (hereinafter abbreviated as MTD), 10 parts of 15% triethylaluminum cyclohexane solution, 5 parts of triethylamine and 10 parts of 20% titanium tetrachloride cyclohexane solution were added as polymerization catalysts. After ring-opening polymerization in cyclohexane, the obtained ring-opened polymer was hydrogenated with a nickel catalyst to produce a polymer solution. The polymer solution was coagulated in isopropanol and dried to produce a powdered resin. The resin had a number average molecular weight of 40,000, its hydrogenation rate was 99.8% or more, and its Tg was 142°C.

[0358] The powdery resin was melted at 250° C. and pelletized. Using a single-screw extruder with a 40-nm fully-flighted screw, the obtained pellets were melt-extruded from a 300-mm-wide T-die, and rolled up with three 300-mm-diameter cooling rolls to produce films. In this p...

Embodiment 2

[0371] Film 1 obtained in Example 1 was freely uniaxially stretched in the conveying direction at 185° C. at a stretch rate of 15% to give a stretched and oriented film. Table 1 shows its optical properties.

[0372] Likewise, Films 2-4 were stretched under the conditions specified in Table 1. Table 1 also shows the optical properties thus obtained.

[0373] In Tables 1 to 3, the numerical values ​​given in columns (A) to (D) each represent the following values.

[0374] (A)Re(450) / Re(550)

[0375] (B)Re(650) / Re(550)

[0376] (C)(Re(450) / Rth(450)) / (Re(550) / Rth(550))

[0377] (D)(Re(650) / Rth(650)) / (Re(550) / Rth(550))

[0378] Film No.

Embodiment 3

[0380]Films 1-4 obtained in Example 1 were freely uniaxially stretched in the conveying direction at 185° C. at a stretch rate of 25%. Next, the films were released at 25% in the conveying direction to give stretched and oriented films. Table 2 shows the stretching conditions and optical properties.

[0381]

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Abstract

An optical resin film is provided and fulfills the following formulae (A) to (D) concerning retardations and is formed by using a polymer or a copolymer of a cycloolefin compound: <?in-line-formulae description="In-line Formulae" end="lead"?>0.1<Re(450) / Re(550)<0.95; (A)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>1.03<Re(650) / Re(550)<1.93; (B)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>0.4<(Re(450) / Rth(450) / Re(550) / Rth(550))<0.95; and (C)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>1.05<(Re(650) / Rth(650) / Re(550) / Rth(550))<1.9. (D)<?in-line-formulae description="In-line Formulae" end="tail"?>

Description

technical field [0001] The present invention relates to an optical resin film, a polarizing plate and a liquid crystal display using the optical resin film. Background technique [0002] Liquid crystal displays have been widely used in monitors for personal computers and mobile phones, televisions, etc., because of a number of advantages such as low-voltage operation, requiring little electricity, and enabling downsizing and thinning modes. These liquid crystal displays have been proposed in various modes according to the alignment state of liquid crystal molecules in the liquid crystal cell. Of all of these, the TN mode in which liquid crystal molecules are aligned at a twist angle of about 90° from the lower substrate toward the upper substrate of the liquid crystal cell is mainly used. [0003] Liquid crystal displays are usually made of liquid crystal elements, optical compensation sheets and polarizers. As an optical compensation sheet for reducing discoloration of an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00G02B5/30G02F1/1335
CPCG02F2413/01G02F2202/40G02F1/13363G02F2001/133635G02F1/133635
Inventor 大轻郁子杉山亨
Owner FUJIFILM CORP