US 8,574,689 B2 · O-plate having excellent durability and itegrated polarizing plate comprising the same

Abstract

There are provided an optical compensation film including an alignment film whose adhesiveness to a substrate and a liquid crystal layer and alignment property are excellent when a novel substrate is used to solve the problem regarding deteriorated durability being caused when a retardation film including a liquid crystal film is used under a hot and humid environment, and an integrated polarizing plate comprising the same. The O-plate includes a substrate; an alignment film prepared by coating the substrate with a composition for an alignment film that is composed of polyvinyl alcohol, a multifunctional acrylate monomer, a compatibilizing agent, a photo initiator and a solvent, followed by undergoing drying, curing and rubbing processes; and a splay-aligned liquid crystal film formed on the alignment film.

Claims15

Dependent claims

An O-plate, comprising:

a substrate;
an alignment film prepared by coating the substrate with a composition for an alignment film that comprises a polyvinyl alcohol (PVA);
13 to 25% by weight of an acrylate monomer based on the weight of the polyvinyl alcohol;
20 to 30% by weight of a compatibilizing agent based on the weight of the acrylate monomer;
10 to 50% by weight of an aqueous photo initiator based on the weight of the acrylate monomer;
and a solvent, followed by undergoing drying, curing and rubbing processes;
and
a splay-aligned liquid crystal film formed on the alignment film,
wherein the solvent comprises a mixture of water and alcohol, and the water to alcohol ratio of the solvent is 40:60 to 50:50,
wherein the compatibilizing agent is poly(4-vinylphenol), and wherein the substrate comprises triacetyl cellulose or a cycloolefin polymer (COP).

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/224,872Filed 15 Nov 2007

Priority

KR 10-2006-011325316 Nov 2006

Published

US 2009/0117293 A17 May 2009

Granted

5 Nov 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

G02B 5/305
Comprising multiple thin layers, e.g. multilayer stacks: including organic materials, e.g. polymeric layers
C09K 2323/02
Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition: alignment…
C09K 2323/03
Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition: viewing…
G02F 2413/15
Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position,…:…

O-plate having excellent durability and itegrated polarizing plate comprising the same

Life of this patent

O-plate having excellent durability and itegrated polarizing plate comprising the same

Life of this patent

Abstract

Claims15