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Method for manufacturing polarizing plate, polarizing plate, optical film and image display device using them

An image display device, polarizing film technology, applied in optics, optical elements, optical elements, etc., can solve problems such as hindering the enlargement of polarizers, deviation of optical characteristics, etc. the benefits of a large effect

Inactive Publication Date: 2007-04-04
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if only these methods are used, in the production process of the conventional polarizing film, the deviation of the optical characteristics in the width direction is likely to occur compared with the case of using a conventional film with a small width. The range (effective width) used by the polarizer becomes smaller, so it hinders the enlargement of the polarizer

Method used

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  • Method for manufacturing polarizing plate, polarizing plate, optical film and image display device using them

Examples

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Effect test

Embodiment 1

[0064] Use a polyvinyl alcohol (PVA) film (manufactured by Kuraray Co., Ltd., degree of polymerization: 2400) with a thickness of 80 μm and a length of 2700 mm in the width direction. Stretched to 3 times in a 0.3 wt% iodine aqueous solution, then stretched in an aqueous solution of 4 wt% boric acid and 3 wt% potassium iodide to a cumulative draw ratio of 6 times, and immersed in a 3.5 wt% potassium iodide solution at 30°C for 10 seconds Thereafter, the film was dried at 30° C. for 4 minutes while maintaining the tension of the film to obtain a polarizing film having a length of 1340 mm in the width direction. Both ends in the width direction of the obtained polarizing film were cut off by 40 mm from the ends, respectively, to obtain a polarizing film having a length of 1260 mm in the width direction. Use the adhesive agent that fully saponified polyvinyl alcohol 5% aqueous solution is main component, on both sides of the polarizing film after cutting, stick the triacetyl cell...

Embodiment 2

[0066] Using a polyvinyl alcohol (PVA) film with a thickness of 75 μm and a length of 3100 mm in the width direction (manufactured by Kuraray, degree of polymerization: 2400), a polarizing film was produced in the same manner as in Example 1 to obtain a polarizing film with a length of 1540 mm in the width direction. Both ends in the width direction of the obtained polarizing film were cut 40 mm from the ends, respectively, to obtain a polarizing film having a length of 1460 mm in the width direction. Use the adhesive agent that is main component with completely saponified polyvinyl alcohol 5% aqueous solution, on both sides of the polarized light film after cutting, stick the triacetyl cellulose (TAC) film (manufactured by Fuji Photo Film Co., Ltd.) of width direction length 1475mm: TDY80UL), by drying at 70° C. for 4 minutes to obtain a polarizing plate.

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Abstract

A method for producing a polarizing plate by joining a protective film to at least one side of a polarizing film produced by at least uniaxial drawing and having an absorption axis in the direction of the uniaxial drawing, wherein at least one edge of the polarizing film generally parallel with the direction of the absorption axis is cut off before the protective film is joined. According to this production method, the effective width of the polarizing plate is widened and a large polarizing plate is obtained.

Description

technical field [0001] The present invention relates to a method for manufacturing polarizers used in image display devices such as liquid crystal displays (LCDs) and electroluminescence displays (ELDs), and further relates to polarizers obtained by the manufacturing methods, and optical films with the polarizers , and further have their image display devices. Background technique [0002] In order to provide bright images with good color reproducibility, polarizers used in image display devices, especially liquid crystal display devices, are required to have high transmittance, high degree of polarization, and in-plane uniformity. Such a polarizer is usually made by dyeing a polymer film such as polyvinyl alcohol (PVA) with a dichroic substance such as iodine or a dichroic dye, as a polarizing film, and then pasting on both sides of the polarizing film. Manufactured together with a protective film made of a polymer film such as triacetyl cellulose (TAC). [0003] In recen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02F1/133528B29D11/00634G02B5/3033G02B5/30
Inventor 水岛洋明济木雄二龟山忠幸和田守正永野忍
Owner NITTO DENKO CORP
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