Front plate of TN liquid crystal panel

Patent metadata

Field	Value
Publication number	US-9817262-B2
Application number	US-201113824157-A
Country	US
Kind code	B2
Filing date	Aug 8, 2011
Priority date	Sep 17, 2010
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

The problem is to provide a front plate of a TN liquid crystal panel capable of inhibiting occurrence of color unevenness caused by retardation of a polycarbonate resin sheet, even when a liquid crystal panel is observed through polarizing glasses or liquid crystal shutter glasses for 3D, while having excellent impact resistance, heat resistance and transparency.
The solution means is the front plate 1 of a TN liquid crystal panel provided with the polycarbonate resin sheet 10 , wherein the direction of the slow axis X or the fast axis Y of the polycarbonate resin sheet 10 is inclined by 45° with respect to the lengthwise direction L of a liquid crystal panel.

First claim

What is claimed is:

1. A display, comprising:
a TN liquid crystal panel having a planar direction and comprising a polycarbonate resin sheet, and
wherein the direction of a slow axis or a fast axis of the polycarbonate resin sheet is inclined by 45° with respect to a lengthwise direction of a TN liquid crystal panel releasing polarized light of an angle of 45° with respect to the plane of the TN liquid crystal panel, and
wherein the direction of the slow axis or the fast axis of the polycarbonate resin sheet and the direction of the slow axis or the fast axis of the TN liquid crystal panel releasing polarized light of an angle of 45° are parallel or orthogonal.

2. A front plate of a TN liquid crystal panel according to claim 1 , wherein a polycarbonate resin constituting the polycarbonate resin sheet has 2,2-bis(4-hydroxyphenyl)propane as a main raw material monomer, a viscosity average molecular weight within a range of 20,000 to 30,000, and a glass transition temperature within a range of 130 to 160° C.

3. A front plate of a TN liquid crystal panel according to claim 1 , wherein the polycarbonate resin sheet has a thickness within a range of 0.3 to 2 mm.

4. A front plate of a TN liquid crystal panel according to claim 1 , further comprising a hard resin layer provided on the front surface or the back surface of the polycarbonate resin sheet with a thickness within a range of 30 to 100 μm and a pencil hardness at a laminated state measured according to JIS5600-5-4 of at least F or more, the hard resin layer is obtained by coextrusion molding with the polycarbonate resin.

5. A front plate of a TN liquid crystal panel according to claim 4 , wherein the hard resin layer consists of an acryl resin, a resin (nuclear hydrogenated MS resin) obtained by hydrogenating an aromatic ring of a copolymer obtained by polymerizing at least one kind of (meth)acrylate ester monomer and at least one kind of aromatic vinyl monomer, or a modified polycarbonate resin having 2,2-bis(4-hydroxy-3-methylphenyl)propane or 2,2-bis(4-hydroxy-3-methylphenyl)cyclohexane as a main raw material monomer.

6. A front plate of a TN liquid crystal panel according to claim 5 , wherein the acryl resin is methyl methacrylate as a main raw material monomer and the glass transition temperature of not less than 95° C.

7. A front plate of a TN liquid crystal panel according to claim 5 , wherein the nuclear hydrogenated MS resin is a resin obtained by hydrogenating an aromatic ring of a copolymer obtained by polymerizing methyl methacrylate and styrene hydrogenated, a copolymerization ratio of them is within a range of 60:40 to 90:10, and a hydrogenation ratio of an aromatic ring is not less than 70%.

8. A front plate of a TN liquid crystal panel according to claim 5 , wherein the modified polycarbonate resin is a copolymer of 2,2-bis(4-hydroxy-3-methylphenyl)propane and 2,2-bis(4-hydroxyphenyl)propane, and a copolymerization ratio of them is 50:50 to 100:0.

9. A front plate of a TN liquid crystal panel according to claim 5 , wherein the modified polycarbonate resin is a copolymer of 2,2-bis(4-hydroxy-3-methylphenyl)cyclohexane and 2,2-bis(4-hydroxyphenyl)propane, and a copolymerization ratio of them is 50:50 to 100:0.

10. A front plate of a TN liquid crystal panel according claim 5 , further comprising a hard coat membrane formed on the top front surface or the top back surface of the TN liquid crystal panel.

11. A front plate of a TN liquid crystal panel according to claim 10 , wherein the hard coat membrane consists of an ultraviolet curable acryl based resin composition, the thickness is within a range of 1 to 20 μm, and the pencil hardness at a laminated state measured according to JIS5600-5-4 is 3H or more.

Assignees

• Koide Koshi
• Kakinoki Osamu
• Mitsubishi Gas Chemical Co
• Mgc Filsheet Co Ltd

Inventors

• Koide Koshi
• Kakinoki Osamu

Classifications

• G02F1/1396

  the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell (G02F1/141 takes precedence) · CPC title

• G02F1/1335 Primary

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title

• G02F1/13363

  Birefringent elements, e.g. for optical compensation · CPC title

• G02F1/133

  Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements (arrangements or circuits for control of liquid crystal elements in a matrix, not structurally associated with these elements G09G3/36) · CPC title

• B32B2457/202

  LCD, i.e. liquid crystal displays · CPC title