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Optical film and liquid crystal display device

A technology of liquid crystal display device and optical film, applied in optics, optical elements, nonlinear optics, etc., can solve the problems of display darkening and productivity deterioration.

Inactive Publication Date: 2007-03-21
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the former case, the transmittance of white display is also lowered at the same time as that of black display, and there is a problem of darkening the display.
In addition, the latter requires replacement of the process, and there is a problem that productivity deteriorates

Method used

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  • Optical film and liquid crystal display device
  • Optical film and liquid crystal display device
  • Optical film and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0153] (optical film)

[0154] The polycarbonate film is stretched at 150°C under the adhesion of a heat-shrinkable film to obtain a thickness of 45 μm and an in-plane retardation Re 2 It is a retardation film of 140 nm and Nz=0.5. The retardation film and the composite absorbing polarizer were laminated with an acrylic adhesive so that the slow axis of the retardation film and the absorption axis of the polarizer were perpendicular to each other, thereby producing an optical film.

[0155] (Liquid Crystal Display Device)

[0156]Using an IPS mode liquid crystal cell with a retardation value of 280 nm for 550 nm, as shown in FIG. On the other hand, the composite absorbing polarizing plate produced above was laminated with an acrylic adhesive on the surface opposite to the liquid crystal cell to produce a liquid crystal display device. The layers are stacked so that the absorption axis of the incident-side polarizing plate (optical film) is perpendicular to the direction of ...

Embodiment 2

[0158] (optical film)

[0159] The polycarbonate film is stretched at 150°C under the adhesion of a heat-shrinkable film to obtain a thickness of 45 μm and an in-plane retardation Re 2 It is a retardation film of 140 nm and Nz=0.3. Using an acrylic adhesive, this retardation film and the same absorbing composite polarizer as used in Example 1 were laminated so that the slow axis of the retardation film and the absorption axis of the polarizer were in a perpendicular state, thereby Make optical films.

[0160] (Liquid Crystal Display Device)

[0161] Using an IPS mode liquid crystal cell with a retardation value of 280 nm at 550 nm, as shown in FIG. 2 , an acrylic adhesive was laminated so that the retardation film side of the optical film was the viewing side of the IPS mode liquid crystal cell. On the other hand, the absorption composite polarizing plate produced above was laminated with an acrylic adhesive on the surface opposite to the liquid crystal cell to produce a li...

Embodiment 3

[0163] (Liquid Crystal Display Device)

[0164] Using an IPS mode liquid crystal cell with a retardation value of 280 nm for 550 nm, as shown in FIG. The face on the incident side. On the other hand, a commercially available polarizing plate (NPF-SEG1224DU, manufactured by Nitto Denko Co., Ltd.) was laminated with an acrylic adhesive on the surface opposite to the liquid crystal cell to produce a liquid crystal display device. The layers are stacked so that the absorption axis of the incident-side polarizing plate (optical film) is perpendicular to the direction of the extraordinary light refractive index possessed by the liquid crystal in the liquid crystal cell. The slow axis of the retardation film (optical film) becomes parallel to the absorption axis of the viewing side polarizing plate. The absorption axis of the incident-side polarizing plate (optical film) and the absorption axis of the viewing-side polarizing plate are in a state of being perpendicular to each other...

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Abstract

An optical film for liquid crystal display devices in which the absorption axis of a polarizer and a slow axis of a phase difference film are perpendicular or parallel to each other. The polarizer is composed of a scattering-dichroic absorption composite polarizing element and transparent protective films formed on both sides of the composite polarizing element. The composite polarizing element is made of a film which has a structure where micro regions are dispersed in a matrix formed of a translucent resin containing a dichroic absorption material. The in-plane phase difference Re1 = (nx1 - ny1)xd1 of the transparent protective films is 10 nm or less and the thickness-direction phase difference Rth = {(nx1 + ny1) / 2 - nz1}xd1 is 30 to 100 nm. The Nz value of Nz = (nx2 - nz2) / (nx2 - ny2) of the phase difference film is 0.1 to 0.8, and the in-plane phase difference Re2 = (nx2 - ny2)xd2 is 60 to 300 nm. When the optical film is applied to a liquid crystal display device operating in an IPS mode, the optical film enables a high contrast ratio in a wide range, a high transmittance, and a high polarization and suppresses the variation of the transmittance during black display to realize easy-to-view display.

Description

technical field [0001] The present invention relates to an optical film in which a polarizing plate and a retardation film are laminated. The optical film of the present invention is suitable for a liquid crystal display device operating in a so-called IPS mode, and is particularly suitable for a transmissive liquid crystal display device. Background technique [0002] In watches, mobile phones, PDAs, notebook computers, monitors for personal computers, DVD players, TVs, etc., liquid crystal display devices are rapidly expanding into the market. A liquid crystal display device visualizes a change in polarization state due to opening and closing of liquid crystals, and uses a polarizer based on this display principle. In particular, high-brightness and high-contrast displays are increasingly required in applications such as TVs, and polarizers that are brighter (high transmittance) and higher contrast (high degree of polarization) have been developed and introduced as polari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02B5/30G02F1/13363
CPCG02F1/133528G02B5/3083G02B5/3033G02F1/13363G02B5/30G02F1/1335
Inventor 宫武稔矢野周治
Owner NITTO DENKO CORP
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