E.i. Dupont De Nemours and Company

Merck Patent Gmbh

Edgar Bohm

Brian C Auman

Melvin P Zussman

Bernd Fiebranz

Akio Osabe

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.

Polyimide photo alignment film from 3,3,4,4-benzophenone tetracarboxylic

The present invention provides a STN LCD device having at least two domains per pixel, comprising:

Multi-domain STN LCD comprising fluorinated polyimide alignment layers

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.

Polyimide film from pyromellitic dianhydride and a bis (4-aminophenoxy)

A polyimide alignment film based on 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride and ortho-substituted aromatic diamines, such as 2,3,5,6-tetramethyl-p-phenylene diamine, 2,4,6-trimethyl-m-phenylene diamine and 1,5-diaminonaphthalene, providing high voltage holding ratio and high tilt angle when used in active matrix liquid crystal displays.

Polyimide alignment film from 2,2-BIS

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 to 2 degrees when used in liquid crystal displays.

Polyimide film from pyromellitic dianhydride and a bis(4-aminophenoxy)

A polyimide alignment film based on pyromellitic dianhydride and a 2,2'-bis(perfluoroalkoxy)benzidine, as major components, for use in liquid crystal display devices.

Polyimide films from pyromellitic dianhydride and

A poly(2,6-piperazinedione) liquid crystal alignment film providing high voltage holding ratio and high tilt angle when used in active matrix and super twisted nematic liquid crystal displays.

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Griesheim, Germany

Edgar Bohm