Phase difference layer laminated body and manufacturing method thereof

a technology of laminated body and phase difference layer, which is applied in the direction of optics, polarising elements, instruments, etc., can solve the problems of limited orientation of resultant phase difference films, inability to meet such demands, and inability to manufacture with ease, and achieves high freedom of molecular orientation. , the effect of high manufacturing eas

Inactive Publication Date: 2008-07-31
DAI NIPPON PRINTING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The present invention has been devised in view of the above problems, and a main object thereof is to provide a phase difference layer laminated body which has very high freedom of molecular orientation in its phase difference layer and which can be manufactured with ease, a manufacturing method thereof, and a liquid crystal display device.
[0009]To achieve the above object, the present invention provides (1), a phase difference layer laminated body including a base material having orientability, and a phase difference layer made of a liquid crystal material that can form a nematic phase and formed in a pattern on the base material such as to have refractive index anisotropy. According to the invention, since a liquid crystal material that can form a nematic phase is used for the phase difference layer, by suitably selecting the type of liquid crystal material and the base material having orientability, it is possible to determine orientation directions with ease, and therefore the phase difference layer laminated body thus obtained can be applied to various optical elements.
[0010](2) In the above invention (1), it is preferable that the above liquid crystal material that can form a nematic phase is obtained by polymerization of at least one of a polymerizable liquid crystal monomer, a polymerizable liquid crystal oligomer, and a polymerizable liquid crystal polymer. The use of such a polymerizable liquid crystal material allows easy patterning of the phase difference layer and enables highly precise patterning, which is achieved, in a curing step, by irradiating the material with an activating radiation beam for polymerizing the polymerizable liquid crystal material in a certain pattern, followed by development.

Problems solved by technology

However, this method only allows fabrication of phase difference films in which the main chains of polymer are oriented in the directions of stretch, and therefore the problem was that the orientation of resultant phase difference films was limited only to directions parallel to the surface of the phase difference film.
Meanwhile, phase difference films having vertical polymer orientation relative to the surface, or various other orientation directions, are now in demand; the problem with the above method for obtaining phase difference films by stretching polymer films is that it cannot meet such demand because of its little freedom in setting orientation direction.
In a multi-domain type liquid crystal display element, for example, in which each unit cell is divided into a plurality of regions with different directions of liquid crystal directors, optical compensation with the conventional phase difference film was, while favorable in some regions, not necessarily satisfactory in other regions.

Method used

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  • Phase difference layer laminated body and manufacturing method thereof
  • Phase difference layer laminated body and manufacturing method thereof
  • Phase difference layer laminated body and manufacturing method thereof

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Experimental program
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first embodiment

a. FIRST EMBODIMENT

[0088]In this embodiment, the base material itself has orientability; specifically, the base material is a stretched film. With a stretched film, the liquid crystal material can be oriented along a stretched direction of the film. Therefore, the processing of the base material is accomplished simply by preparation of a stretched film, which is a merit that the processing step is made very simple. For the stretched film, any commercially available stretched film can be used, or a stretched film can be made, according to needs, of various materials.

[0089]More specifically, examples of the film include films made of thermoplastic polymers, such as polycarbonate polymers, polyester polymers such as polyarylate or polyethylene terephthalate, polyimide polymers, polysulfone polymers, polyethersulfone polymers, polystyrene polymers, polyolefin polymers such as polyethylene or polypropylene, polyvinyl alcohol polymers, cellulose acetate polymers, polyvinyl chloride polyme...

second embodiment

b. SECOND EMBODIMENT

[0093]In the second embodiment, the base material having the above orientability comprises a transparent substrate and an oriented film formed thereon.

[0094]With this embodiment, there is a merit that selection of the orientated film enables selection of orientation in a relatively wider range of directions. Selecting the type of liquid applied on the transparent substrate for forming the oriented film allows orientation in various directions and enables even more effective orientation.

[0095]An oriented film commonly used for a liquid crystal display device or the like can favorably be used for the oriented film of this embodiment; generally, an oriented film of polyimide that has undergone rubbing treatment is favorably used.

[0096]For the transparent substrate used in this embodiment, any transparent material can be used, e.g., a transparent and rigid material having no flexibility such as silica glass, Pyrex (registered trademark) glass, and synthetic silica gl...

example

[0183]An example will be described below for further explanation of the invention.

[0184]A solution of polymerizable liquid crystal monomer in toluene was prepared, the monomer having a mesogen in the center, polymerizable acrylate at either end, and a spacer linking therebetween, and having a liquid crystal-isotropic transition temperature (temperature at which liquid crystal transforms into an isotropic phase) of 100° C. Note that, a photopolymerization initiator (Irg 184: Ciba Specialty Chemicals Corp.) was added to the above solution in toluene in an amount of 5% by weight relative to the monomer molecules.

[0185]Meanwhile, polyimide was applied on a glass substrate to form a coat, which then underwent rubbing treatment in certain directions, to form an oriented film.

[0186]This glass substrate with the oriented film was then set in a spin coater, and the above solution in toluene was applied onto the oriented film to a thickness of about 5 μm by spin coating.

[0187]Next, the substr...

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Abstract

A main object of the invention is to provide a phase difference layer laminated body which has a very high freedom in orienting molecules of its phase difference layer, and which is manufactured with ease.To achieve the above object, the invention provides a phase difference layer laminated body including a base material having orientability, and a phase difference layer made of a liquid crystal material that can form a nematic phase and formed in a pattern on the base material such as to have refractive index anisotropy.

Description

[0001]This is a Continuation of application Ser. No. 11 / 602,382 filed Nov. 21, 2006, which is a Division of application Ser. No. 10 / 473,215 filed Oct. 30, 2003, which is a National Phase of PCT / JP02 / 11601 filed Nov. 7, 2002. The disclosures of the prior applications are hereby incorporated by reference herein in their entirety.TECHNICAL FIELD[0002]The present invention relates to a phase difference layer laminated body which offers high orientation freedom and allows easy patterning, a manufacturing method thereof, and a liquid crystal display device.BACKGROUND ART[0003]Phase difference film used for liquid crystal displays and the like is conventionally made of a polymer film which is stretched in certain directions to orient the main chains of the polymer in these directions so that the polymer film exhibits refractive index anisotropy.[0004]According to this method, the polymer film can be provided with refractive index anisotropy with relative ease; the method was excellent in t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02F1/13363G02F1/13G02B1/04G02B5/30G02B30/25G02F1/1337G02F1/139
CPCG02B5/3016G02B5/3083G02F1/13363G02F2413/09G02F2001/133633G02F2001/133638G02F1/1393G02F1/133631G02F1/133633G02F1/133638
Inventor KASHIMA, KEIJI
Owner DAI NIPPON PRINTING CO LTD
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