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Liquid crystal panel and liquid crystal display

A liquid crystal panel and liquid crystal cell technology, applied in optics, instruments, nonlinear optics, etc., can solve problems such as screen contrast, reduce chromatic aberration, suppress uneven display, etc., achieve excellent screen contrast, improve screen contrast, and small chromatic aberration. Effect

Inactive Publication Date: 2008-11-05
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies are not sufficient to improve screen contrast, reduce color shift (Color Shift) and suppress display unevenness

Method used

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  • Liquid crystal panel and liquid crystal display
  • Liquid crystal panel and liquid crystal display
  • Liquid crystal panel and liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0185] (Formation of the first optical compensation layer)

[0186] A film of cellulose ester having a thickness of 70 μm [manufactured by Kaneka Corporation, trade name: KA, DSac (degree of acetyl substitution)=0.04, DSpr (degree of substitution of propionyl group)=2.76] was stretched free-end by 1.5 at 145° C. times to obtain a first optical compensation layer with a thickness of 68 μm. The photoelastic modulus of the obtained first optical compensation layer is 25×10 -12 (m 2 / N). The in-plane retardation of the obtained first optical compensation layer was Δnd(380)=65nm, Δnd(550)=90nm, Δnd(780)=105nm, and the retardation in the thickness direction was Rth(380)=69nm, Rth( 550) = 95 nm, Rth (780) = 111 nm. The refractive index profile at 550nm is

[0187] (Manufacture of polarizing plate with first optical compensation layer)

[0188] The above-obtained first optical compensation layer was bonded to a TAC protective film (manufactured by Fujifilm Corporation, trade n...

Embodiment 2

[0196] (Formation of the first optical compensation layer)

[0197] A cellulose ester film [manufactured by Kaneka Corporation, trade name: KA] having a thickness of 70 μm was stretched 1.45 times at the free end at 145° C. to obtain a first optical compensation layer. The photoelastic modulus of the obtained first optical compensation layer is 25×10 -12 (m 2 / N). The in-plane retardation of the obtained first optical compensation layer was Δnd(380)=58nm, Δnd(550)=80nm, Δnd(780)=93nm, and the retardation in the thickness direction was Rth(380)=65nm, Rth( 550)=90nm, Rth(780)=105nm. The refractive index profile at 550nm is

[0198] (Formation of the second optical compensation layer)

[0199] 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl (TFMB) The synthesized polyimide was dissolved in methyl isobutyl ketone (MIBK) to prepare a 15% by mass polyimide solution. This solution was coated on a triacetylce...

Embodiment 3

[0202] (Formation of the first optical compensation layer)

[0203] A cellulose ester film [manufactured by Kaneka Corporation, trade name: KA] having a thickness of 70 μm was stretched 1.55 times at the free end at 145° C. to obtain a first optical compensation layer. The photoelastic modulus of the obtained first optical compensation layer is 25×10 -12 (m 2 / N). The in-plane retardation of the obtained first optical compensation layer was Δnd(380)=73nm, Δnd(550)=100nm, Δnd(780)=117nm, and the retardation in the thickness direction was Rth(380)=76nm, Rth( 550)=105nm, Rth(780)=123nm. The refractive index profile at 550nm is

[0204] (Formation of the second optical compensation layer)

[0205] 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl (TFMB) The synthesized polyimide was dissolved in methyl isobutyl ketone (MIBK) to prepare a 15% by mass polyimide solution. This solution was coated on a triacety...

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Abstract

A liquid crystal panel and a liquid crystal display exhibiting excellent screen contrast while suppressing color shift and unevenness in display. The liquid crystal panel comprises a liquid crystal cell, a first polarizer arranged on one side of the liquid crystal cell, a second polarizer arranged on the other side of the liquid crystal cell, and at least two optical compensation layers including first and second optical compensation layers arranged between the first and second polrizers. The first optical compensation layer has the absolute value of photoelasticity coefficient not larger than 4010<-12> (m<2> / N) and has relations expressed by formulas (1) and (2), and the second optical compensation layer has relations expressed by formulas (3) and (4). Delta nd(380)ny=nz...(2) Rth(380)>Rth(550)>Rth(780)...(3) nx=ny>nz...(4).

Description

technical field [0001] The present invention relates to a liquid crystal panel and a liquid crystal display device. More specifically, the present invention relates to a liquid crystal panel and a liquid crystal display device having at least two optical compensation layers between a first polarizing plate and a second polarizing plate. Background technique [0002] In the VA mode or OCB mode liquid crystal cell, when no voltage is applied, the liquid crystal molecules are aligned in the vertical direction. Therefore, when the liquid crystal panel is viewed from an oblique direction, the liquid crystal molecules appear to be in an obliquely oriented state, and the polarization state of light from the oblique direction changes due to the birefringence of the liquid crystal, so light leakage occurs from the polarizing plate. In addition, since the polarizing plates are laminated so that their absorption axes are perpendicular to each other, light is blocked. However, when the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13363G02B5/30G02F1/1335
CPCG02F2202/40G02F2413/02G02F1/133634G02B5/3083G02F2413/07G02B5/3033G02B5/30G02F1/1335
Inventor 武田健太郎村上奈穗长濑纯一饭田敏行吉田健太郎
Owner NITTO DENKO CORP
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