Optical element, retardation plate using same, optical laminated body,and display apparatus

• US 20060279865A1
• Filed: 02/06/2006
• Published: 12/14/2006
• Est. Priority Date: 02/08/2005
• Status: Abandoned Application

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Tazaki, Keiko, Haritani, Takeshi, Takeshige, Shoji, Ito, Norihito
• Application Number:
  US11/348,212
• Publication Number:
  US 20060279865A1
• Time in Patent Office: Days
• US Class Current: 359/883
• CPC Class Codes: C09K 19/2007 the chain containing -COO- or -OCO- groups
• CPC Class Codes: C09K 19/52 characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
• CPC Class Codes: C09K 2019/0448 the end chain group being a polymerizable end group, e.g. -Sp-P or acrylate
• CPC Class Codes: C09K 2019/3408 Five-membered ring with oxygen(s) in fused, bridged or spiro ring systems
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001

Abstract

An optical element, with an improved adhesion strength of the liquid crystal layer, and without substantial deterioration of the optical characteristics (such as transparency deterioration, white turbidity and display irregularity). The optical element has a transparent substrate, an alignment layer, and a liquid crystal layer formed on above-mentioned transparent substrate via the alignment layer. The liquid crystal layer contains an adhesion improving agent; a retardation plate including the above-mentioned optical element; an optical laminated body including the above-mentioned optical element and a polarizing plate; and a display apparatus including the above-mentioned retardation plate or optical laminated body disposed on the optical path.

Claims

1. An optical element comprising a transparent substrate, an alignment layer, and a liquid crystal layer formed on the transparent substrate via the alignment layer, wherein the liquid crystal layer contains an adhesion improving agent.

2. The optical element according to claim 1, wherein the adhesion improving agent is a compound having an amino group.

3. The optical element according to claim 1, wherein the adhesion improving agent is a silane compound.

4. The optical element according to claim 1, wherein the liquid crystal layer contains an ultraviolet ray cured product of a monomer showing a nematic liquid crystal property and having a functional group of an ultraviolet ray curing property, and the adhesion improving agent.

5. The optical element according to claim 1, wherein a content of the adhesion improving agent is 0.005% by weight or more and 5% by weight or ess with respect to a solid content amount of a coating solution for forming the liquid crystal layer.

6. The optical element according to claim 4, wherein the monomer showing the nematic liquid crystal property is fixed in a state of a parallel structure, a perpendicular structure or a helical structure with respect to the transparent substrate.

7. A retardation plate comprising the optical element according to claim 1.

8. An optical laminated body comprising the optical element according to claim 1 and a polarizing plate.

9. A display apparatus comprising the retardation plate according to claim 7 disposed on an optical path.