Patent · US Expired

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

US6348245B1 · kind B1 · utility

3Cited by

6References

2Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

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

Key dates

Filing date	Aug 25, 2000
Grant date	Feb 19, 2002
Priority date	—
Expiry date	Aug 25, 2020

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 fofmulae 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.