Liquid crystal optical element, a liquid crystal display element and a projection type liquid crystal display apparatus

• US 5,858,268 A
• Filed: 06/27/1996
• Issued: 01/12/1999
• Est. Priority Date: 06/28/1995
• Status: Expired due to Term

• Current Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Original Assignee: AG Technology Co., Ltd.
• Inventors: Kumai, Hiroshi, Niiyama, Satoshi
• Primary Examiner(s): Kelly, C. H.
• Application Number:
  US08/673,756
• Time in Patent Office: 929 Days
• Field of Search: 428/1, 252/582, 252/299.01, 349/183
• US Class Current: 252/299.01
• CPC Class Codes: C09K 19/544 as dispersing or encapsulating medium around the liquid crystal

Abstract

A liquid crystal optical element comprising a pair of substrates with electrodes and a liquid crystal/polymer composite material which is composed of a liquid crystal and a polymer and interposed between the pair of substrates, wherein the polymer phase of the liquid crystal/polymer composite material is a polymeric cured product of a polymerizable curable material comprising an addition-polymerizable compound presented by the following formula (1):

CXY=CZ--CO--O--R--OH                                       (1)

wherein each of X, Y and Z is --H or --CH₃, and R is a bivalent hydrocarbon group which has 4 to 8 carbon atoms in total and at least one carbon atom between the carbon atom bonded to the ester linkage and the carbon atom bonded to the hydroxyl group in the formula (1), and may have at least one linkage selected from the group consisting of an ether linkage, an ester linkage and a carbonate linkage, substituted for one or more carbon--carbon linkages.

Claims

1. A liquid crystal optical element comprising a pair of substrates with electrodes and a liquid crystal/polymer composite material which is composed of a liquid crystal and a polymer and interposed between the pair of substrates, wherein the polymer phase of the liquid crystal/polymer composite material is a polymeric cured product of a polymerizable curable material comprising a high-molecular weight compound having at least one thermo- or photo-polymerizable functional group and an addition-polymerizable compound presented by the following formula (1):

space="preserve" listing-type="equation">CXY=CZ--CO--O--R--OH (1)

wherein each of X, Y and Z is --H or --CH₃, and R is a bivalent hydrocarbon group which has 4 to 8 carbon atoms in total and at least one carbon atom between the carbon atom bonded to the ester linkage and the carbon atom bonded to the hydroxyl group in the formula (1), and may have at least one linkage selected from the group consisting of an ether linkage, an ester linkage and a carbonate linkage, substituted for one or more carbon--carbon linkages.

2. The liquid crystal optical element according to claim 1, wherein the ratio of the compound represented by the formula (1) to the total addition-polymerizable compounds in the polymerizable curable material is from 10 to 70 wt %.

3. The liquid crystal optical element according to claim 1, wherein R is --(CH₂)_n -- (wherein n is an integer of from 4 to 8).

4. The liquid crystal optical element according to claim 1, wherein the compound represented by the formula (1) is a hydroxyl group-containing acrylate.

5. A liquid crystal display element comprising an active matrix substrate having an active element for each pixel electrode, a counter electrode substrate having a counter electrode and a liquid crystal/polymer composite material for the liquid crystal optical element defined in claim 1 wherein the liquid crystal/polymer composite material is interposed between the active matrix substrate and the counter electrode substrate.

6. A liquid crystal display element comprising an active matrix substrate having an active element for each pixel electrode, a counter electrode substrate having a counter electrode and a liquid crystal/polymer composite material for the liquid crystal optical element defined in claim 2 wherein the liquid crystal/polymer composite material is interposed between the active matrix substrate and the counter electrode substrate.

7. A liquid crystal display element comprising an active matrix substrate having an active element for each pixel electrode, a counter electrode substrate having a counter electrode and a liquid crystal/polymer composite material for the liquid crystal optical element defined in claim 3 wherein the liquid crystal/polymer composite material is interposed between the active matrix substrate and the counter electrode substrate.

8. A liquid crystal display element comprising an active matrix substrate having an active element for each pixel electrode, a counter electrode substrate having a counter electrode and a liquid crystal/polymer composite material for the liquid crystal optical element defined in claim 4 wherein the liquid crystal/polymer composite material is interposed between the active matrix substrate and the counter electrode substrate.

9. A projection type liquid crystal display apparatus comprising the liquid crystal display element defined in claim 5, a projection light source and a projection optical system.

10. A projection type liquid crystal display apparatus comprising the liquid crystal display element defined in claim 6, a projection light source and a projection optical system.

11. A projection type liquid crystal display apparatus comprising the liquid crystal display element defined in claim 7, a projection light source and a projection optical system.

12. A projection type liquid crystal display apparatus comprising the liquid crystal display element defined in claim 8, a projection light source and a projection optical system.