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Retardation-film integrated polarizing plate and method of manufacturing the same

A retardation film and polarizer technology, applied in polarizing elements, optics, instruments, etc., can solve the problems of image coloring or narrow viewing angle, difficult to improve image display quality, etc., and achieve the effect of eliminating image coloring

Active Publication Date: 2006-04-12
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the production of the above-mentioned retardation film, if the polymer film that produces the retardation is continuously stretched in the width direction, for example, a so-called bending phenomenon in which the orientation axis in the plane becomes fan-shaped occurs, so it is difficult to pass a wide width. directional stretching produces a uniform orientation axis or birefringence, retardation
In the case of laminating such a retardation film and a polarizing plate, it is difficult to improve the display quality of images such as frontal contrast and oblique contrast due to coloring of the image or narrowing of the viewing angle.

Method used

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  • Retardation-film integrated polarizing plate and method of manufacturing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0102] An unstretched norbornene-based film having a thickness of 100 μm and a width of 600 mm (manufactured by JSR Corporation, trade name ““ ゼオノア"), and shrunk in the longitudinal direction at the same time to prepare a retardation film (thickness 97 μm). Further, the stretching temperature was 135° C., the STD in the width direction was 1.25 times, and the SMD in the longitudinal direction was 0.90 times. For the obtained retardation film, an automatic birefringence meter (trade name KOBRA-21ADH; manufactured by Oji Scientific Instruments Co., Ltd.) was used to measure the in-plane retardation (Δnd) at 9 points in the width direction and at intervals of 50 mm in a left-right symmetrical manner. =(nx-ny)xd) and thickness direction retardation (Rth=(nx-nz)xd) and orientation angle distribution. For the above-mentioned in-plane retardation and thickness direction retardation, an average value was calculated, and the Nz coefficient was calculated from the average value. The re...

Embodiment 2

[0106] A retardation film (thickness 94 μm) was formed in the same manner as in Example 1 except that the SMD in the longitudinal direction was 0.93 times. About the obtained retardation film, the in-plane retardation etc. were measured by the method similar to the method described in Example 1, and Table 1 shows the result.

[0107] In addition, the obtained retardation film was laminated with the polarizing plate by the method described in Example 1.

Embodiment 3

[0109] A retardation film (thickness 82 μm) was produced in the same manner as in Example 1 using an unstretched cellulose film with a thickness of 96 μm and a width of 600 mm (“KA film” manufactured by Kanoka Co., Ltd.). About the obtained retardation film, the in-plane retardation etc. were measured by the method similar to the method described in Example 1, and Table 1 shows the result.

[0110] In addition, the obtained retardation film was laminated with the polarizing plate by the method described in Example 1.

[0111] In addition, the stretching temperature was 160° C., the STD in the width direction was 1.5 times, and the SMD in the longitudinal direction was 0.82 times.

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Abstract

A retardation-film integrated polarizing plate includes a polarizing plate stretched in a lengthwise direction thereof and having an absorption angle in the lengthwise direction, and a uniaxial retardation film having a slow axis in a widthwise direction thereof and an Nz coefficient of 0.9-1.1, in which the polarizing plate is laminated with the uniaxial retardation film so as to have the slow axis of the retardation film oriented at an angle of 90 degrees plus or minus 5 degrees to the absorption axis of the polarizing plate. The thus arranged polarizing plate is capable of enhancing the front contrast and the contrast at oblique viewing angles.

Description

technical field [0001] The present invention relates to a retardation film-integrated polarizer and a manufacturing method of the retardation film-integrated polarizer. Background technique [0002] In the past, in various liquid crystal display devices, retardation films have been used in order to improve the display quality of images, such as eliminating coloration of images, widening viewing angles, and the like. The retardation film is usually produced by controlling the retardation in the plane through a stretching process such as uniaxial stretching or biaxial stretching. [0003] When such a retardation film is laminated together with a polarizer to produce a retardation film-integrated polarizer used in various liquid crystal displays and the like, it is necessary to arrange the absorption axis of the polarizer and the slow axis of the retardation film are roughly orthogonal. The polarizing plate is usually formed by stretching a strip-shaped polarizing film in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02F1/133634G02F1/133528G02B5/3083G02F1/13363G02B5/30
Inventor 石桥邦昭吉见裕之
Owner NITTO DENKO CORP