Transparent film and optical compensatory film, polarizing plate and liquid-crystal display device employing it

A transparent film and film technology, applied in optics, polarizing elements, nonlinear optics, etc., can solve the problems of biaxial film axis offset, image plane, unevenness, etc.

Active Publication Date: 2008-12-31
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, where two biaxial films are used, this method is still problematic due to the tendency for the axis shift of the biaxial films to occur and the image plane is often non-uniform
In addition, the in-plane retardation Re and the retardation Rth in the thickness direction of the triacetyl cellulose film used so far as a polarizer-protective film between the liquid crystal cell and the polarizer cause light leakage in the black state

Method used

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  • Transparent film and optical compensatory film, polarizing plate and liquid-crystal display device employing it
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  • Transparent film and optical compensatory film, polarizing plate and liquid-crystal display device employing it

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preparation example Construction

[0137] The transparent film of the present invention can be formed from a hot melt of a thermoplastic polymer resin, or a homogeneous solution of a polymer (solvent casting method). In the case of film formation that is a hot melt of resin, various additives (for example, optical anisotropy-reducing compounds, wavelength dispersion controllers, ultraviolet inhibitors, plasticizers, antioxidants, fine particles, etc.) , optical performance control agent) was added to it. On the other hand, when a transparent film is formed from a polymer solution (hereinafter referred to as a dope), various additives (for example, compounds for reducing optical anisotropy, wavelength Dispersion control agent, UV inhibitor, plasticizer, antioxidant, fine particles, optical performance control agent) are added to the dope. These additives are described below. These additives may be added to the dope at any time during the preparation of the dope. For example, the dope preparation method may in...

Embodiment 1-1

[0522] (Formation of transparent film)

[0523] Polycarbonate film "Panlite C1400" (available from Teijin Chemical), thermoplastic norbornene resin (JSR's Arton) and Zeonoa (available from Nippon Zeon) were dissolved in methylene chloride to prepare a solution. Compounds having reduced optical anisotropy (Re(λ) and Rth(λ)) shown in Table 1-1 were added to the solution in a predetermined amount relative to the polymer solid content of the solution, and the resulting solution was cast A transparent thin film (001-006) with a thickness of 40 µm was formed. As for its optical properties, it is understood that the positiveness / negativeness of Rth of the transparent thin film of the present invention, 002, 004 and 006 are opposite at 400nm and 700nm.

[0524]

[0525] (Preparation of Polarizer)

[0526] A roll-shaped polyvinyl alcohol film with a thickness of 80 μm was continuously stretched 5 times in an iodine aqueous solution, and dried to obtain a polarizing film with a thi...

Embodiment 1-2

[0528] (Formation of transparent film)

[0529] (Preparation of Cellulose Acylate Solution)

[0530] Using the different cellulose acylates in Tables 1-2, the following compositions were put into a mixing tank and stirred to dissolve the components, whereby cellulose acylate solutions were prepared.

[0531] (Composition of Cellulose Acylate Solution)

[0532] Cellulose acylate 100.0 parts by weight

[0533] Dichloromethane (first solvent) 402.0 parts by weight

[0534] Methanol (the second solvent) 60.0 parts by weight

[0535] (Preparation of matting agent solution)

[0536] 20 parts by weight of silica particles having an average particle diameter of 16 nm (Aerosil R972 from Nippon Aerosil) and 80 parts by weight of methanol were thoroughly stirred and mixed for 30 minutes to prepare a silica particle dispersion. This dispersion liquid was added to a disperser together with the following composition, and stirred therein again for 30 minutes or longer to dissolve these ...

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Abstract

The invention discloses a novel transparent film. Re(λ) and Rth(λ) defined by the following formulas (I) and (II) of the film satisfy the following formulas (III) and (IV): (I) Re(λ)=(nx-ny)xd , (II) Rth(λ)={(nx+ny) / 2-nz}xd, (III)0≤|Re(630)|≤50, (IV)Rth(400)x Rth(700)≤0 , and 0≤|Rth(700)-Rth(400)|≤150, wherein, Re(λ) refers to the in-plane retardation value (unit: nm) under the wavelength λnm; Rth(λ) refers to the in-plane retardation value under the wavelength λnm Retardation value in the thickness direction (unit: nm); nx refers to the refractive index in the direction of the slow axis in the plane; ny refers to the refractive index in the direction of the fast axis in the plane; nz refers to the refractive index in the direction of the film thickness; and d refers to the Thickness of the film.

Description

technical field [0001] The present invention relates to a transparent film, an optical compensation sheet, a polarizing plate and a liquid crystal display device using the film. Background technique [0002] A liquid crystal display device generally includes a liquid crystal cell and a polarizing plate. The polarizing plate has a protective film and a polarizing film, and can be obtained, for example, by dyeing a polarizing film formed of a polyvinyl alcohol film with iodine, stretching it, and laminating protective films on both sides thereof. In general, a transmissive liquid crystal display device may include such polarizing plates mounted on both sides of a liquid crystal cell, and may also have one or more optical compensation films provided therein. A reflective liquid crystal display device generally includes a reflector, a liquid crystal element, one or more optical compensation films, and a polarizer mounted in sequence. A liquid crystal cell consists of liquid cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30C08J5/18G02F1/1335G02F1/13363C08L101/00
Inventor 中山元齐藤之人
Owner FUJIFILM CORP
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