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Complex birefringent medium, polarizing plate, and liquid crystal device

A liquid crystal display device, birefringence technology, applied in the directions of optics, polarizing elements, optical elements, etc., to achieve the effect of improving the degree of freedom, easy control, and realizing broadbandization

Inactive Publication Date: 2012-05-23
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When white light is incident on this type of retardation film, the polarization states of different wavelengths change in different ways, resulting in coloring of the outgoing light.

Method used

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  • Complex birefringent medium, polarizing plate, and liquid crystal device
  • Complex birefringent medium, polarizing plate, and liquid crystal device
  • Complex birefringent medium, polarizing plate, and liquid crystal device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0283] The first birefringent layer (first birefringent layer) formed by uniaxially stretching a norbornene resin (NB) film and the second birefringent layer (second birefringent layer) formed by uniaxially stretching a polystyrene resin (PS) film Two kinds of birefringent layers) are laminated through a transparent acrylic adhesive without birefringence to form the composite birefringent medium of Example 1.

Embodiment 2

[0285] The first birefringent layer (first birefringent layer) formed by uniaxially stretching a norbornene resin film laterally and the second birefringent layer (second birefringent layer) formed by laterally uniaxially extending a polystyrene resin film layer) was laminated with a transparent acrylic adhesive having no birefringence to form the composite birefringent medium of Example 2.

Embodiment 3

[0287] The first birefringent layer (first birefringent layer) formed by biaxially stretching a norbornene resin film and the second birefringent layer (second birefringent layer) formed by laterally uniaxially stretching a polystyrene resin film ) are laminated with a transparent and non-birefringent acrylic adhesive to form the composite birefringent medium of Example 3.

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Abstract

The present invention provides a complex birefringent medium, which has the so-called inverse wavelength dispersibility, that is, a wavelength dispersibility capable of giving an optimum phase difference to a light of a wide visible wavelength range, has a wide viewing angle, can be produced by a convenient method and is excellent in a degree of adjusting freedom of inverse wavelength dispersibility and in mass productivity, a polarizing plate and a liquid crystal display device. The complex birefringent medium of the present invention is a complex birefringent medium having a structure in which a plurality of birefringent layers are laminated, wherein in the complex birefringent medium, a phase difference exhibits inverse wavelength dispersibility as the whole of the complex birefringentmedium, and wherein when a principal refractive index having the maximum absolute value of a difference from an average value of three principal refractive indexes at a wavelength lambda(nm) is designated as a first principal refractive index n1 (lambda), a normal line of the birefringent layer and a principal axis corresponding to the first principal refractive index n1(550) of the birefringent layer are in the same plane.

Description

technical field [0001] The invention relates to a compound birefringence medium, a polarizing plate and a liquid crystal display device. More specifically, it relates to a composite birefringent medium exhibiting reverse wavelength dispersion, a polarizing plate and a liquid crystal display device using the composite birefringent medium. Background technique [0002] The birefringent medium is an optical element capable of converting the polarization state (linear polarization, circular polarization, elliptical polarization) of incident light. Such a birefringent medium acts as a λ / 4 plate having a phase difference (birefringent phase difference, retardation) equivalent to 1 / 4 of the wavelength λ of incident light to have a phase difference corresponding to 1 / 2 of the wavelength λ of incident light. A retardation film represented by a retardation λ / 2 plate is widely industrially used in liquid crystal display devices and the like together with a linear polarizer that obtain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335G02F1/13363
CPCG02F2001/133637G02F1/133634G02F1/13363G02B5/3016G02F2413/10G02F1/133637G02B5/30
Inventor 坂井彰夏目隆行长谷川雅浩津田和彦山田信明
Owner SHARP KK
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