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

An optical film and polarizer technology, applied in optics, optical elements, polarizing elements, etc., can solve the problem of changing the color tone of the displayed image, and achieve the effect of wide viewing angle and viewing angle.

Inactive Publication Date: 2005-02-02
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, even when using the wideband retarder described in the above-mentioned patent document, there is a drawback of gradation inversion, in which slanted lines (up, down, left, and Observation of the displayed image in the right) direction changes the color tone of the displayed image, or produces an inversion between a white image and a black image

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
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Effect test

Embodiment 1

[0122] (Optical films with controlled three-dimensional refractive index (1))

[0123] For the polymer film comprising polycarbonate resin and styrene resin, PF film (55 μm in thickness): product name, manufactured by Kaneka Corporation was used. Polycarbonate resins include those derived from 2,2-bis(4-hydroxyphenyl)propane and 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (blending A polymer in a ratio of 40:60 (weight ratio)). In addition, the content ratio of the styrene resin (weight average molecular weight: 10,000) in the polymer film was 20% by weight.

[0124]A heat-shrinkable film, which is a biaxially stretched polyester film, was adhered on both sides of a polymer film (PF film) via a pressure-sensitive adhesive layer. Then, the obtained film was held with a synchronous biaxial stretching machine, and stretched 1.3 times at 145°C. The obtained stretched film was transparent, and had a thickness of 60 μm, frontal retardation of 140 nm, retardation in the th...

Embodiment 2

[0132] Through a layer of pressure-sensitive adhesive (30 μm thick, acrylic-based pressure-sensitive adhesive), press as Figure 5 The order of the optical film (1) / optical film (3) / optical film (2) / polarizer (P) shown in the lamination is used for the optical film (1), optical film (2) in Example 1, An optical film (3) and a polarizer (P), and an elliptical polarizer is obtained.

Embodiment 3

[0134] Through a layer of pressure-sensitive adhesive (30 μm thick, acrylic-based pressure-sensitive adhesive), press as Image 6 The sequence of the optical film (1) / optical film (2) / optical film (3) / polarizer (P) shown in the lamination is used for the optical film (1) in Example 1, the optical film (2), An optical film (3) and a polarizer (P), and an elliptical polarizer is obtained.

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Abstract

A laminated optical film comprising an optical film(1) obtained by stretching a polymer film comprising a polycarbonate resin and a styrene resin, wherein a photoelastic coefficient is 2.0 x 10<-11> to 6.0 x 10<-11>m<2> / N, and a three dimensional refractive index is controlled, an optical film (2) showing optically positive uniaxial property that satisfies a relationship of nx2 > ny2 SIMILAR nz2, and an optical film (3) formed of a material showing optically negative uniaxial property, and the material being tilting aligned; enables inhibition of coloring of display image for observation of a display picture in a diagonal direction to normal line of a screen, and enables display of an image having little gradation inversion areas, and that has outstanding durability.

Description

technical field [0001] The present 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 various optical films such as retardation films, viewing angle compensation films, optical compensation films, elliptical polarizers (including circular polarizers) and brightness enhancement films. It is particularly useful when the laminated optical film of the present invention is laminated with a polarizer for use as an elliptical polarizer. [0002] In addition, the present invention relates to image displays such as liquid crystal displays, organic EL (electroluminescent) displays, PDPs using laminated optical films, elliptical polarizing plates, and the like. The laminated optical film and the elliptical polarizing plate of the present invention can be used for various liquid crystal displays and the like as described above, and can be particularly suitably used for reflective and ret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335B32B7/02B32B27/30B32B27/36C08J5/18G02B5/30G02F1/13363
CPCC08J2369/00G02F1/133634G02B5/3083C08J2325/00C08J5/18G02F1/1335
Inventor 畑昌宏
Owner NITTO DENKO CORP
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