Patent · US Expired

Polyimide photo alignment film from 3,3,4,4-benzophenone tetracarboxylic dianhydride and ortho-substituted aromatic diamines for liquid crystal displays

US6139926A · kind A · utility

12Cited by

6References

3Claims

0Family size

Assignees

E.I. DU PONT DE NEMOURS AND COMPANY · US
Merck Patent GmbH · DE

Inventors

Brian C. Auman · Avondale, US
Melvin P. Zussman · Wilmington, US
Bernd Fiebranz · Munster, DE
Edgar Bohm · Clausthal-Zellerfeld, DE

Key dates

Filing date	May 21, 1998
Grant date	Oct 31, 2000
Priority date	—
Expiry date	May 21, 2018

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31721
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to polyimide photo alignment films for liquid crystal display devices comprising an aromatic tetracarboxylic dianhydride component containing 3,3',4,4'-benzophenone tetracarboxylic dianhydride and an aromatic diamine component containing at least one diamine of the group of formulae AI to AIII as given in the text. Further display devices and methods of their fabrication employing a photo alignment process are disclosed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.