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Optical film, elliptic polarizing piece and image display

A technology of optical films and polarizers, applied in the direction of optics, optical components, polarizing components, etc.

Inactive Publication Date: 2004-06-30
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there is a drawback that even when using a broadband retarder having the composition disclosed in the above-mentioned reference patent, viewing in the vertical and horizontal diagonal directions with respect to the screen vertical direction causes hue inversion, which gives the display Changed hue or shift between white and black images

Method used

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  • Optical film, elliptic polarizing piece and image display
  • Optical film, elliptic polarizing piece and image display
  • Optical film, elliptic polarizing piece and image display

Examples

Experimental program
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Effect test

Embodiment 1

[0087] (Optical films with controlled three-dimensional refractive index (1))

[0088] A heat-shrinkable film comprising a biaxially stretched polyester film was adhered on both sides of a transparent polycarbonate film having a thickness of 70 micrometers through a pressure-sensitive adhesive layer. Next, the obtained film was held in a simultaneous biaxial stretcher, and stretched 1.1 times at 155°C. The obtained stretched film had a thickness of 72 micrometers, front retardation: 140 nm, retardation in the thickness direction: 70 nm, and Nz coefficient: 0.5.

[0089] (Optical films in which substances exhibiting negative optical uniaxial properties are obliquely aligned (2))

[0090] WVSA 12B (thickness: 110 micrometers) manufactured by FUJI PHOTO FILM Co., LTD. was used. The film is prepared by coating smectic liquid crystals onto a supporting medium, and has frontal retardation: 30 nm, retardation in thickness direction: 160 nm, and tilt angle of average optical axis fo...

Embodiment 2

[0096] (Optical films with controlled three-dimensional refractive index (1))

[0097] A heat-shrinkable film comprising a biaxially stretched polyester film was adhered on both sides of a transparent polycarbonate film having a thickness of 70 micrometers through a pressure-sensitive adhesive layer. Next, the obtained film was held in a simultaneous biaxial stretcher, and stretched 1.05 times at 165°C. The obtained stretched film had a thickness of 75 micrometers, front retardation: 140 nm, retardation in the thickness direction: 0 nm, Nz coefficient: 0.

[0098] (laminated optical film and elliptical polarizer)

[0099] Except for using the stretched film prepared above as the optical film (1) in Example 1, the same method as in Example 1 was repeated to obtain a laminated optical film and an elliptical polarizing plate.

Embodiment 3

[0101]With the optical film (1) used in embodiment 1, optical film (2), optical film (3) and polarizer (P) with optical film (1) / optical film (2) / optical film (3) / The order of the polarizer (P) was laminated through a pressure-sensitive adhesive layer (acrylic-based pressure-sensitive adhesive: thickness 30 µm) to obtain an elliptical polarizer ( Figure 6 ).

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Abstract

A laminated optical film including an optical film (1) whose three dimensional refractive index is controlled so that an Nz coefficient represented with Nz = (nx1 - nz1) / (nx1 - ny1) satisfies a relationship of Nz <= 0.9, when a direction where a refractive index in a film plane gives maximum is defined as X-axis, a direction perpendicular to X-axis as Y-axis, a thickness direction of the film as Z-axis, and refractive indexes in each axial direction are defined as nx1, ny1, and nz1, respectively, and an optical film (2) that is formed with a material showing optically negative uniaxial property, and being tilting aligned. The laminated optical film may suppress coloring of the display, and may display a picture with few tone reversal regions.

Description

technical field [0001] The present invention relates to a laminated optical film. The laminated optical film of the present invention can be used alone or together with other optical films as various optical films such as retardation plates, viewing angle compensation films, optical compensation films, elliptical polarizers (including circular polarizers) and brightness enhancement films. The laminated optical film of the present invention is useful particularly in the case of using it as an elliptical polarizing plate laminated with a polarizing plate. Furthermore, the present invention relates to an image display such as a liquid crystal display, an organic EL (Electroluminescence) display, a PDP, etc. using a laminated optical film and an elliptical polarizing plate or the like. The present invention also relates to an optical element on which the relevant optical diffusion sheet is prepared. The laminated optical film and elliptical polarizing plate of the present invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/13363
CPCG02B5/3016G02B5/3083G02B5/3033G02F1/13363G02B5/30
Inventor 畑昌宏冈田裕之下平起市
Owner NITTO DENKO CORP
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