Manufacture of a substrate having a modified orientation layer a

Details Manufacture of a substrate having a modified orientation layer a Manufacture of a substrate having a modified orientation layer a

1995-09-19

1998-01-06

Bell, Janyce

Coating processes

Optical element produced

Transparent base

427166, 4272554, 427340, 4273897, 4273935, 4274072, 4274121, 349183, 428 1, B05D 506

Patent

active

057052204

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.

REFERENCES:
patent: 5173342 (1992-12-01), Sato et al.
patent: 5231523 (1993-07-01), Nakaya et al.
patent: 5422148 (1995-06-01), Itoh et al.

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