Laminated optical film, liquid crystal panel, and liquid crystal display

A liquid crystal display device and optical film technology, applied in optics, optical elements, nonlinear optics, etc., can solve the problems of mixing foreign matter, increase in the manufacturing process of liquid crystal display device, abnormality, etc., and achieve the effect of simplifying the manufacturing process and realizing thinning

Inactive Publication Date: 2010-09-15
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the number of components will increase the number of manufacturing steps of the liquid crystal display device (laminated optical film), which will increase the possibility of foreign matter being mixed between the layers and causing abnormalities due to the mixed foreign matter.

Method used

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  • Laminated optical film, liquid crystal panel, and liquid crystal display
  • Laminated optical film, liquid crystal panel, and liquid crystal display
  • Laminated optical film, liquid crystal panel, and liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] (Production of retardation layer)

[0123] After forming a polyvinyl alcohol film (0.1 μm in thickness) on the surface of a substrate (TAC film, 40 μm in thickness), rubbing treatment was performed on the surface of the polyvinyl alcohol film in a direction 45° to the longitudinal direction of the substrate using an orientation cloth , making an orientation substrate.

[0124] Next, 10 g of polymerizable liquid crystals (manufactured by BASF Corporation, trade name Paliocolor LC242) exhibiting a nematic liquid crystal phase, and a photopolymerization initiator for the polymerizable liquid crystal compound (manufactured by Ciba Specialty Chemicals, 0.5 g of Irgacure 907 (trade name, containing 1% of benzotriazole-based ultraviolet absorber) was dissolved in 40 g of toluene to prepare a coating solution. Then, this coating liquid was applied to the surface of the alignment substrate obtained above by a bar coater, and then heated and dried at 90° C. for 2 minutes to alig...

Embodiment 2

[0133] (production of polarizer)

[0134] A polyvinyl alcohol film (average degree of polymerization: 2400, degree of saponification: 99.9%) having a thickness of 80 μm was immersed in pure water at 30° C. to swell. Next, it was stretched 2.5 times while being immersed in a dyeing bath containing iodine and potassium iodide at 30° C. for 60 seconds for dyeing. Then, it was stretched 2.3 times while being immersed in a boric acid aqueous solution at 40° C. for 60 seconds. Next, it was immersed in an aqueous solution having a potassium iodide concentration of 5% at 30° C. for 5 seconds. Thereafter, it was dried at 50° C. for 4 minutes to obtain a polarizing plate (thickness: 26 μm).

[0135] (Manufacturing of laminated optical film)

[0136] On the TAC film side of the TAC film formed with the hard coat layer obtained in Example 1, a polyester-based adhesive (manufactured by Takeda Pharmaceutical Co., Ltd.; trade name: Takenate A310 / Takelac A-3; solvent: ethyl acetate ; Thic...

reference example 1

[0147] (Manufacturing of laminated optical film)

[0148] A laminated optical film was obtained in the same manner as in Example 1 except that the retardation layer was not laminated.

[0149] Compared with the laminated optical film of Comparative Example 1, the laminated optical films of Example 1 and Example 2 of the present invention were remarkably thinner. As a result, the laminated optical film of the present invention can contribute to thinning of liquid crystal panels and liquid crystal display devices.

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Abstract

A laminated optical film contributing production of thin-shaped liquid crystal panels and liquid crystal displays and manufactured by a simplified production process and a laminated optical film manufacturing method are provided. The laminated optical film is used for liquid crystal displays and placed on the viewed side of the liquid crystal cells. The film is composed of a polarizer and a phase difference layer which is disposed on one side of the polarizer, whose refractive index ellipsoid satisfies a relation nx>ny=nz, and whose parallel phase difference value Re[590] ranges from 90 to 190 nm. The angle between the absorption axis of the polarizer and the slow axis of the phase difference layer ranges from 5 to 85 DEG . The phase difference layer is made of a liquid crystal material and disposed nearer to the viewed side than the polarizer.

Description

technical field [0001] The invention relates to a laminated optical film. More specifically, the present invention relates to a laminated optical film that can contribute to thinning of liquid crystal panels and liquid crystal display devices. Background technique [0002] In recent years, due to the start of mobile terrestrial digital video (one segment broadcasting) broadcasting, etc., mobile devices such as mobile phones have also begun to be used as image and motion displays. Therefore, display methods of mobile devices have become diverse. For example, a mobile device whose display screen can be rotated in a plane can be mentioned. When viewing the above-mentioned display screen through polarized lenses such as polarized sunglasses, it may not be possible to view the image. Therefore, a liquid crystal display device is proposed in which a lens-shaped transparent cover (λ / 4 plate) of a resin molded product is provided on the viewing side of a display screen (for examp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B7/02G02F1/13363
CPCG02F2413/05G02F2413/08G02F2201/50G02F2202/28G02F2001/133635G02F1/13363G02F2001/133531G02B5/3083G02F1/133531G02F1/133635
Inventor 小林显太郎木下亮儿稻垣淳一木畑充裕前田佳己柳沼宽教
Owner NITTO DENKO CORP
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