The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 1998
Filed:
Sep. 19, 1995
Gerard Cnossen, Eindhoven, NL;
Nicolaas P Willard, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
The invention relates to a method of manufacturing a substrate having a modified orientation layer and a liquid-crystalline display device comprising such a substrate. The orientation layer is made from a polymer and is modified with organic groups which induce a pretilt in the liquid-crystalline material when they are used in a liquid-crystalline display device. According to the invention, for modifying the orientation layer use is made of a precursor compound of the organic groups which is vaporized, whereafter the substrate carrying the orientation layer is exposed to the vapour formed in the process. Preferably, the orientation layer comprises hydroxyl groups such as PVA, and a carboxylic acid halogenide such as an alkyloyl chloride is used as the precursor. A further favourable combination comprises orientation layers of polyamide acid and alkylamine precursor compounds.