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Liquid crystal display device

By controlling the polarization of light by utilizing the thickness direction phase difference of the substrate and the characteristics of the optical compensation layer in the liquid crystal display device, the problem of insufficient black brightness in the oblique direction in the liquid crystal display device is solved, and sufficient black display when viewed from the oblique direction is achieved.

Active Publication Date: 2021-10-01
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a liquid crystal display device, there is a problem that the luminance of black in an oblique direction does not sufficiently decrease (that is, black display does not become sufficiently black when viewed from an oblique direction).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0094] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples. The evaluation items in the examples are as follows.

[0095] (1) Product A×E

[0096] Calculated using optical simulation. In the optical simulation, the LCD Master Simulator "LCD MASTER Ver.3.1.3" manufactured by Shintech Co., Ltd. was used to calculate the wavelength 450nm to 650nm in the direction of the azimuth angle of 45° and the polar angle of 60° using the extended function of LCD Master The azimuth angle of the outgoing polarized light of the light, the difference between its maximum value and minimum value is set as A. In addition, the ellipticity of outgoing polarized light of light with a wavelength of 450 nm to 650 nm in directions of an azimuth angle of 45° and a polar angle of 60° is calculated, and the difference between the maximum value and the minimum value thereof is defined as E.

[0097] (2) Maximum black brightness

[0098...

manufacture example 1

[0099] [Manufacturing example 1: Production of a visual recognition side polarizing plate]

[0100] As the thermoplastic resin substrate, use a long amorphous isophthalic acid-copolyethylene terephthalate film (thickness: 100 μm) with a Tg of about 75°C, and apply it to one side of the resin substrate. Corona treatment.

[0101] 100 wt. 13 parts by weight of potassium iodide was dissolved in water to prepare an aqueous PVA solution (coating solution).

[0102] The above-mentioned PVA aqueous solution was applied on the corona-treated surface of the resin substrate and dried at 60° C. to form a PVA-based resin layer with a thickness of 13 μm to produce a laminate.

[0103] The obtained laminate was uniaxially stretched to 2.4 times in the longitudinal direction (length direction) in an oven at 130° C. (in-air auxiliary stretching treatment).

[0104] Next, the laminated body was immersed for 30 seconds in an insolubilization bath (an aqueous boric acid solution obtained by m...

manufacture example 2

[0112] [Manufacturing example 2: Fabrication of rear-side polarizing plate]

[0113] It carried out similarly to manufacture example 1, and obtained the laminated body which has the structure of a resin base material / 2nd polarizer. A TAC film (thickness: 20 μm) was bonded to the polarizer surface (the surface opposite to the resin substrate) of the obtained laminate as an inner protective layer. Next, the resin substrate was peeled off, and a reflective polarizer (26 μm in thickness) was bonded to the peeled surface through an adhesive layer (12 μm in thickness) to obtain a configuration having a reflective polarizer / second polarizer / inner protective layer The back side polarizer.

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PUM

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Abstract

Provided is a liquid crystal display device with a sufficiently low black brightness in an oblique direction. This liquid crystal display device is provided with: a liquid crystal cell that comprises a viewing-side substrate, a back-side substrate, and a liquid crystal layer that is sandwiched between the viewing-side substrate and the back-side substrate, and includes liquid crystal molecules aligned in a homogenous array when no electrical field is present; a first polarizer disposed on the viewing side of the liquid crystal cell; a second polarizer disposed on the back side of the liquid crystal cell; a first optical compensation layer disposed between the liquid crystal cell and the first polarizer; and a second optical compensation layer disposed between the liquid crystal cell and the second polarizer. The thickness-direction phase difference Rth (550) between the viewing-side substrate and the back-side substrate is in the range -10 to 100 nm, and the product A*E of the difference A (degree) between the maximum value and the minimum value of the azimuth of polarization of 450 nm to 650 nm light that exits the liquid crystal cell at a polar angle of 60 degrees and an azimuth of 45 degrees and the difference E (degree) between the maximum value and the minimum value of the ellipticity of polarization of the light is 300 or less.

Description

technical field [0001] The present invention relates to a liquid crystal display device. Background technique [0002] In recent years, as an image display device, a liquid crystal display device has spread remarkably. Various liquid crystal drive modes are used in liquid crystal display devices, and a liquid crystal display device using a uniformly aligned liquid crystal cell is known as a representative example. In such a liquid crystal display device, there is a problem that the black luminance in an oblique direction does not sufficiently decrease (that is, black display does not become sufficiently black when viewed from an oblique direction). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2009-139747 Contents of the invention [0006] The technical problem to be solved by the invention [0007] The present invention was made to solve the above-mentioned conventional technical problems, and an obj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02F1/13363
CPCG02F1/133528G02F1/13363G02F1/133634G02B5/30G02F1/133637G02F2413/02G02F1/1337
Owner NITTO DENKO CORP