Photosensitive crosslinkable polyester alignment layers for liquid crystal displays

• US 5,213,853 A
• Filed: 11/26/1991
• Issued: 05/25/1993
• Est. Priority Date: 11/26/1991
• Status: Expired due to Term

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Noonan, John M.
• Primary Examiner(s): Thomas, Alexander S.
• Application Number:
  US07/799,472
• Time in Patent Office: 546 Days
• Field of Search: 428/1, 359/75, 359/78
• US Class Current: 428/1.2
• CPC Class Codes: C08G 63/547 Hydroxy compounds containing aromatic rings
• CPC Class Codes: C09K 19/0225 Ferroelectric
• CPC Class Codes: C09K 2323/02 Alignment layer characterised by chemical composition
• CPC Class Codes: G02F 1/133516 Methods for their manufacture, e.g. printing, electro-deposition or photolithography
• CPC Class Codes: G02F 1/133711 by organic films, e.g. polymeric films

Abstract

A liquid crystal display element comprising:

1) a pair of substrates including a first transparent substrate having thereon a transparent electrode and a polymeric alignment layer, and a second transparent substrate having thereon a transparent electrode and a polymeric alignment layer;

2) a ferroelectric liquid crystal material disposed between the pair of substrates; and

3) at least one of the first or second substrates further comprising a color filter array;

and wherein the polymeric alignment layer is a crosslinked polyester which is derived from 1,4-phenylene bis(2-acrylic acid) and at least one aliphatic glycol that does not contain any aromatic dibasic acid component.

Claims

1. In a liquid crystal display element comprising:

1) a pair of substrates including a first transparent substrate having thereon a transparent electrode and a polymeric alignment layer, and a second transparent substrate having thereon a transparent electrode and a polymeric alignment layer;

2) a ferroelectric liquid crystal material disposed between said pair of substrates; and

3) at least one of said first or second substrates further comprising a color filter array;

the improvement wherein each said polymeric alignment layer is a crosslinked polyester which is derived from 1,4-phenylene bis(2-acrylic acid) and at least one aliphatic glycol that does not contain any aromatic dibasic acid component.

2. The element of claim 1 wherein said transparent conducting layer is indium tin oxide.

3. The element of claim 1 wherein said polyester is derived from an aliphatic diol which is HO--C₅ H₁₀ --OH.

4. The element of claim 1 wherein said polyester is derived from an aliphatic diol having the formula HO--R--H wherein R is:

##STR9## wherein n in an integer of from 1 to 4.

5. The element of claim 1 wherein said transparent substrates are glass.