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US 5,856,432 AGranted
Polyimide film from pyromellitic dianhydride and a bis (4-aminophenoxy) aromatic compound as an alignment layer for liquid crystal displays
AssigneesE. I. DuPont de Nemours and Company, Merck Patent GmbH
InventorsBrian Carl Auman, Edgar Bohm
Life of this patent
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Abstract
A polyimide alignment film based on pyromellitic dianhydride and a bis(4-aminophenoxy) aromatic compound, such as 1,3-bis(4-aminophenoxy)benzene or 1,4-bis(4-aminophenoxy)benzene, providing low tilt angles of from 1 to 2 degrees when used in liquid crystal displays.
Claims7
A liquid crystal display device comprising:
- (a) a liquid crystal layer having opposite sides:
- (b) a set of electrodes on either side of said liquid crystal layer;
- and
- (c) a polyimide alignment film layer, between each set of electrodes and said liquid crystal layer, comprising pyromellitic dianhydride as aromatic tetracarboxylic dianhydride component and an aromatic diamine component of the formula ##STR15## wherein X is selected from the group consisting of ##STR16## and wherein said polyimide alignment film provides said liquid crystal layer with a tilt angle of from 1 to 2 degrees.
1 more element
Dependencies are inferred from the claim text.