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Laminated optical film, and liquid crystal panel and liquid crystal display apparatus using the laminated optical film

A liquid crystal panel and optical film technology, which is applied in optics, optical components, nonlinear optics, etc., can solve the problem of insufficient color shift in reducing screen contrast, and achieve the effect of reducing color shift and improving screen contrast

Active Publication Date: 2010-02-24
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these techniques are insufficient in improving picture contrast and reducing color shift

Method used

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  • Laminated optical film, and liquid crystal panel and liquid crystal display apparatus using the laminated optical film
  • Laminated optical film, and liquid crystal panel and liquid crystal display apparatus using the laminated optical film
  • Laminated optical film, and liquid crystal panel and liquid crystal display apparatus using the laminated optical film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0150] (production of polarizing plate)

[0151] After dyeing the polyvinyl alcohol film in an aqueous solution containing iodine, in an aqueous solution containing boric acid, it was uniaxially stretched to 6 times between rollers with different rate ratios to obtain a polarizing plate. On both sides of the polarizer, a triacetyl cellulose film (thickness 40 μm, manufactured by Konica Minolta, trade name: KC4UYW) was attached as a protective layer (the first protective layer and the second protective layer) via a polyvinyl alcohol-based adhesive (thickness 0.1 μm). 2 protective layers). The in-plane retardation Re(550) of the protective layer was 0.9 nm, and the retardation Rth(550) in the thickness direction was 1.2 nm. This polarizing plate was fabricated in the above-mentioned manner. In addition, Re(550) shows the value when it measured with the light of wavelength 550nm at 23 degreeC.

[0152] (Production of the first optical compensation layer)

[0153] A strip-shap...

Embodiment 2

[0176] (Production of laminated optical film C)

[0177] Using the film described below as the first optical compensation layer, the Rth of the second optical compensation layer 2 The laminated optical film C was produced in the same manner as the laminated optical film B except that it was -140 nm.

[0178] (1st optical compensation layer)

[0179] A strip-shaped norbornene-based resin film (manufactured by Japan Zeon Corporation, trade name Zeonor, thickness 60 μm, photoelastic coefficient 3.1×10 -12 m 2 / N) Fixed end biaxially stretched to 1.7 times at 150° C. to produce a long film. The in-plane retardation Re of the film 1 120nm, retardation Rth in the thickness direction 1 156nm, Nz coefficient (Rth 1 / Re 1 ) is 1.3. The obtained film was punched out to a size corresponding to the above-mentioned liquid crystal cell to form a first optical compensation layer.

[0180] (Production of LCD panels)

[0181] A liquid crystal panel was obtained in the same manner as ...

Embodiment 3

[0184] (Preparation of adhesive aqueous solution)

[0185] With respect to 100 parts by weight of acetoacetyl group-containing polyvinyl alcohol-based resin (average degree of polymerization: 1200, degree of saponification: 98.5 mol%, degree of acetoacetylation: 5 mol%), 50 parts by weight of methylol melamine at 30 It was dissolved in pure water at a temperature of °C to obtain an aqueous solution whose solid component concentration was adjusted to 3.7%. An aqueous adhesive solution was prepared by adding 18 parts by weight of an aqueous alumina colloid solution (average particle size: 15 nm, solid content concentration: 10%, positive charge) to 100 parts by weight of the above aqueous solution. The viscosity of the aqueous adhesive solution was 9.6 mPa·s. The pH of the aqueous adhesive solution is 4-4.5.

[0186] (Manufacturing of laminated optical film C')

[0187] After dyeing the polyvinyl alcohol film in an aqueous solution containing iodine, in an aqueous solution cont...

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Abstract

A multilayer optical film exhibiting excellent screen contrast while suppressing color shift. A liquid crystal panel and a liquid crystal display are also provided. The multilayer optical film comprises at least a polarizer, a first optical compensation layer where an index ellipsoid has a relation of nx>ny=nz and the in-plane retardation Re1 is 80-300 nm, a second optical compensation layer wherean index ellipsoid has a relation of nz>nx=ny, and a third optical compensation layer where an index ellipsoid has a relation of nx>ny=nz and the in-plane retardation Re3 is 80-200 nm formed in thisorder, and the absorption axis of the polarizer intersects the slow axis of the first optical compensation layer perpendicularly.

Description

technical field [0001] The invention relates to a laminated optical film, a liquid crystal panel and a liquid crystal display device using the laminated optical film. More specifically, the present invention relates to a laminated optical film having a polarizing plate and at least three optical compensation layers, a liquid crystal panel and a liquid crystal display device using the laminated optical film. Background technique [0002] In a liquid crystal display device, various optical films in which a polarizing film and an optical compensation layer are combined are generally used for optical compensation. [0003] A circularly polarizing plate which is one of the above-mentioned optical films can usually be produced by combining a polarizing film and a λ / 4 plate. However, the λ / 4 plate exhibits a so-called "positive wavelength dispersion characteristic" in which the retardation value increases as the wavelength becomes closer to the shorter wavelength side, and the wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13363G02B5/30
CPCG02F2413/03G02B5/3083G02F2413/04G02B5/305G02F1/133634G02F2001/133531G02F1/13363G02F1/133531
Inventor 尾藤真乡首藤俊介鲭江岬川本育郎本村弘则
Owner NITTO DENKO CORP
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