Polarizing film, laminated film, and liquid crystal display

a technology of laminated film and liquid crystal display, which is applied in the direction of polarizing elements, instruments, transportation and packaging, etc., can solve the limitation of enlarging the insufficient widthwise length of the conventional polarizing film cannot be obtained, and the limitation of the conventional long film in the widthwise direction, etc. achieve the effect of high optical compensation, increase in screen size, and efficient production

Inactive Publication Date: 2006-09-21
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] An object of the invention is to provide a polarizing film in which: the transverse size thereof can be arbitrarily set to form the orthogonal relation between absorption axes thereof in front and rear surfaces of a liquid crystal cell; increase in screen size of liquid crystal display, especially a screen having an arbitrary transverse size can be achieved; the polarizing film and a retardation film can be laminated each other as long films, and a laminated film comprising the laminate can be produced efficiently, and to develop a laminated film in which the retardation due to the liquid crystal cell can be highly optically compensated to attain widening of the viewing angle or the like.

Problems solved by technology

In this case, a sufficient widthwise length could not be obtained in the conventional polarizing film since shrinkage occurred in the widthwise direction in a uniaxial stretching step or the like.
Then, there was a problem that it was difficult to increase the screen size of liquid crystal display and particularly to obtain a sufficient transverse length.
There is a limitation in enlarging of the conventional long film in the widthwise direction because of accuracy in processing into the polarizing film such as the accuracy of orientation, the degree of polarization, etc.
In this case, there was a drawback that the direction of the slow axis was apt to vary because of a boing phenomenon that the center portion of the film progressed compared with the case where the long film is stretched in the lengthwise direction to provide a retardation film having a slow axis in the lengthwise direction.

Method used

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  • Polarizing film, laminated film, and liquid crystal display
  • Polarizing film, laminated film, and liquid crystal display
  • Polarizing film, laminated film, and liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0142] A film was unrolled out successively from a roll of film made of polyvinyl alcohol (PVA) having the degree of polymerization of 2400 and having a thickness of 75 μm, a width of 0.3 m and a length of 500 m. The film was stretched by five times in the widthwise direction by a tenter stretching machine at 120° C. Then, the stretched film was immersed in a dye bath of a mixture of iodine and potassium iodine at 30° C. for 1 minute while shrinking in the lengthwise direction was suppressed. Then, the stretched film was immersed in an aqueous solution of 5% potassium iodide at 30° C. for 5 seconds. Then, the stretched film was dried at 45° C. for 7 minutes while fixed so that shrinking of the film was suppressed. The film obtained thus was cut by a width of 1 m. Triacetyl cellulose (TAC) films were laminated on both surfaces of the film through PVA water-soluble adhesive agents. Thus, a TD polarizing film having a three-layer structure of TAC film / TD polarizer / TAC film was obtained...

referential example 1

[0144] A film was unrolled out successively from a roll of film made of a norbornene resin film (ARTON manufactured by JSR CORP.) and having a thickness of 100 pm, a width of 1.2 m and a length of 500 m. The film was stretched by 1.3 times in the lengthwise direction by a roll type longitudinal stretching method at 170° C. Then, the stretched film was cut by a width of 1 m. Thus, an (MD) retardation film was obtained and rolled up. The film had Re of 100 nm. The Re distribution (variation: difference between a maximum value and a minimum value, this rule applies hereunder) in the widthwise direction was 5 nm. The slow axis distribution (in the lengthwise direction) was 1 degree.

[0145] Incidentally, Re (and Rz which will be described later) was calculated on the basis of refractive indices measured by KOBRA-21ADH manufactured by OJI SCIENTIFIC INSTRUMENTS. In the following description, refractive indices were measured in the same manner.

referential example 2

[0146] A (TD) retardation film was obtained in the same manner as in Referential example 1 except that an ARTON film was stretched by 1.5 times in the width direction by a tenter stretching machine at 175° C. The retardation film was rolled up. The film had Re of 100 nm. The Re distribution in the widthwise direction was 8 m. The slow axis distribution (in the widthwise direction) was 2.5 degrees.

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Abstract

The invention provides a polarizing film comprising: a long polymer film; and a dichroic substance, wherein the polarizing film has an absorption axis in the TD direction of the polarizing film.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a polarizing film suitable for the increase in screen size of a liquid crystal display, a laminated film suitable for optically compensating a retardation due to a liquid crystal cell, and a liquid crystal display having these films arranged. BACKGROUND ART [0002] In IPS mode or VA mode liquid crystal display, polarizers are arranged on front and rear surfaces of a liquid crystal cell so that absorption axes (vibrating directions of light to cause absorption) become perpendicular to each other. A long polarizing film prepared by dyeing a polyvinyl alcohol film or the like with a dichroic substance has been heretofore formed in such a manner that the long film is uniaxially stretched in the lengthwise direction of the long film. In this case, the absorption axis of the polarizing film appears in the lengthwise direction. [0003] In use of the conventional long polarizing film, the long film is cut into film pieces by a pre...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B9/04C08J7/06G02B5/30G02F1/1335G02F1/13363
CPCG02B5/3033Y10T428/1041B32B33/00C09K2323/031Y10T428/31504G02B5/30G02F1/1335G02F1/13363B32B38/0012
Inventor ISHIBASHI, KUNIAKIYOSHIMI, HIROYUKI
Owner NITTO DENKO CORP
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