LIQUID CRYSTAL DISPLAY PROTECTION PLATE

• US 20100060833A1
• Filed: 09/02/2009
• Published: 03/11/2010
• Est. Priority Date: 09/03/2008
• Status: Abandoned Application

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Ochiai, Shinsuke, Koyama, Koji, Sumida, Masakazu
• Application Number:
  US12/552,587
• Publication Number:
  US 20100060833A1
• Time in Patent Office: Days
• US Class Current: 349/117
• CPC Class Codes: B32B 2250/24 All layers being polymeric
• CPC Class Codes: B32B 2255/10 on synthetic resin layer or on natural or synthetic rubber layer
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 2307/584 Scratch resistance
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/365 comprising polycarbonates
• CPC Class Codes: G02F 1/133311 Environmental protection, e.g. against dust or humidity
• CPC Class Codes: G02F 1/133331 Cover glasses
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133635 Multifunctional compensators
• CPC Class Codes: G02F 2201/50 Protective arrangements
• CPC Class Codes: G02F 2202/023 curable
• CPC Class Codes: G02F 2202/40 Materials having a particular birefringence, retardation

Abstract

The invention provides a liquid crystal display protection plate capable of suppressing deterioration of the visibility of an image in the case where a screen of a liquid crystal display is seen through a polarizing filter such as polarizing sunglasses. The liquid crystal display protection plate having an in-plane retardation value of 85 to 300 nm is constituted by a scratching-resistant resin plate in which a cured coating film is disposed on at least one face of a resin substrate. A laminate plate in which a methacrylic resin layer is laminated on at least one face of a polycarbonate resin layer is preferably used as the resin substrate.

Claims

1. A liquid crystal display protection plate,

comprising a scratching-resistant resin plate in which a cured coating film is disposed on at least one face of a resin substrate and

having an in-plane retardation value of 85 to 300 nm.

2. The liquid crystal display protection plate according to claim 1, wherein the resin substrate has an in-plane retardation value of 90 to 300 nm.

3. The liquid crystal display protection plate according to claim 1, wherein the scratching-resistant resin plate is a plate in which a cured coating film is disposed on one face of a resin substrate and a film having an in-plane retardation value of 90 to 300 nm is stuck to the face of the resin substrate, the face being on the opposite side of the cured coating film side.

4. The liquid crystal display protection plate according to claim 1, wherein the scratching-resistant resin plate is a plate in which at least one cured coating film is disposed on each face of a resin substrate and a film having an in-plane retardation value of 90 to 300 nm is stuck to one of the cured coating films.

5. The liquid crystal display protection plate according to claim 1, wherein the thickness of the resin substrate is 0.2 to 3 mm.

6. The liquid crystal display protection plate according to claim 1, wherein the resin substrate is a laminate plate in which a methacrylic resin layer is laminated on at least one face of a polycarbonate resin layer.

7. The liquid crystal display protection plate according to claim 6, wherein the thickness of the polycarbonate resin layer is 50% or more of the thickness of the resin substrate and the thickness of the methacrylic resin layer is 3 μ

m or more.

8. The liquid crystal display protection plate according to claim 1, wherein the cured coating film is a coating film formed by using a curable coating material containing a compound having at least three (meth)acryloyloxy groups in a molecule.

9. The liquid crystal display protection plate according to claim 1, wherein the cured coating film is a coating film formed by using a curable coating material containing conductive particles.

10. The liquid crystal display protection plate according to claim 1, which is used as a display window protection plate of a portable information terminal having a liquid crystal display as a display window.