Laminated optical film, elliptically polarizing plate, and image viewing display

A technology of optical film and ellipsometry, applied in optics, optical components, polarizing components, etc., can solve the problems of display image color change, white image and black image inversion, grayscale inversion, etc.

Inactive Publication Date: 2006-04-19
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, even in the case of using the wide-band retardation plates of the above-mentioned patent documents 3 to 5, when the display screen is observed obliquely from up, down, left, and right with respect to the normal direction of the screen, there are color samples of the displayed image. Disadvantages of gradation inversion that change or reverse white and black images

Method used

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  • Laminated optical film, elliptically polarizing plate, and image viewing display
  • Laminated optical film, elliptically polarizing plate, and image viewing display
  • Laminated optical film, elliptically polarizing plate, and image viewing display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0163] (Optical film with controlled three-dimensional refractive index1)

[0164] (polymer film)

[0165] As the polymer film containing a polycarbonate resin and a styrene resin, a product name: Elmec film (thickness: 55 μm) manufactured by Chung Yeon Chemical Industry Co., Ltd. was used. Polycarbonate-based resins containing 2,2-bis(4-hydroxyphenyl)propane and 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane The material is mixed in a ratio of 40:60 by weight. In addition, the content rate of the styrene-type resin (10000 weight average molecular weight) in a polymer film was 27 weight%.

[0166]

[0167] A heat-shrinkable film made of a biaxially oriented polyester film was attached to both surfaces of the polymer film (Elmec film) via an adhesive layer. Then, it was stretched to 1.3 times at 145° C. while being held by a biaxial stretching machine. The obtained stretched film (optical film 1) was transparent and had a thickness of 60 μm, a retardation of 140 nm i...

Embodiment 2

[0176] Such as Figure 5 As shown, optical film 1, optical film 2, optical film 3 and polarizing plate P used in Example 1 were prepared according to optical film 1 / optical film 3 / The order of optical film 2 / polarizing plate P was laminated to obtain an elliptically polarizing plate. The dimensions of the elliptically polarizing plate, the optical films 1 to 3, and the lamination angle of the polarizing plate P are the same as in Example 1.

Embodiment 3

[0178] Such as Figure 6 As shown, optical film 1, optical film 2, optical film 3 and polarizing plate P used in Example 1 were prepared according to optical film 1 / optical film 2 / The order of optical film 3 / polarizing plate P was laminated to obtain an elliptically polarizing plate. The dimensions of the elliptically polarizing plate, the optical films 1 to 3, and the lamination angle of the polarizing plate P are the same as in Example 1.

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Abstract

The invention provides an optical film which is capable of suppressing the coloring of display image even when the display image is viewed obliquely with respect to the normal direction of a screen and is capable of displaying an image having minimized gradation reversed region, and is excellent in durability. The multilayer optical film is constituted by laminating: an optical film (1) which is obtained by stretching a polymer film comprising polycarbonate base resin and styrene type resin, has an absolute value of photoelasticity coefficient of 2.0x10<-11> to 6.0x10<-11> m<2> / N and has controlled three-dimensional refractive index so as to obtain the Nz coefficient satisfying Nz <= 0.9 and the front retardation satisfying Re >= 80 nm; an optical film (2) showing an optically positive uniaxial property; and an optical film (3) made of a material showing an optically negative uniaxial property, comprising a part in which the material is obliquely aligned, and having a thickness of 30 to 90 mum.

Description

technical field [0001] The invention relates to a laminated optical film. The optical film of the present invention can be used alone or in combination with other optical films as retardation films, viewing angle compensation films, optical compensation films, elliptical polarizers (including circular polarizers), brightness improvement films and other optical films. In particular, the laminated optical film of the present invention is extremely useful when laminated with a polarizer and used as an elliptically polarizing film. [0002] In addition, the present invention also relates to image display devices such as liquid crystal display devices, organic EL (electroluminescence) display devices, and PDPs using the above-mentioned laminated optical film, elliptically polarizing plate, and the like. The laminated optical film and elliptically polarizing plate of the present invention can be applied to various liquid crystal display devices as described above, and are particula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/3083B32B7/12C08J5/18G02F1/133528G02F1/133753B32B2307/42
Inventor 畑昌宏北村吉绍
Owner NITTO DENKO CORP
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