Patent · US Expired

Process for increasing pretilt angles in nematic liquid crystal cells

US5172255A · kind A · utility

29Cited by

1References

6Claims

0Family size

Assignee

Nokia (Unterhaltungselektronik/(Deutschland) GmbH · DE

Inventors

Stefan Brosig · Hankensbüttel, DE
Hansjorg Wirsig · Kornwestheim, DE

Key dates

Filing date	Apr 20, 1992
Grant date	Dec 15, 1992
Priority date	—
Expiry date	Apr 20, 2012

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/133784
WIPO fieldOptics
WIPO sectorInstruments

Abstract

In a process for treating an organic orientation layer on a substrate plate for a liquid crystal cell, the orientation layer for causing the orientation is rubbed in the conventional way in a specified direction. Rubbing is then performed in the opposite direction, but with a weaker rubbing pressure. Rubbing in the opposite direction with weak pressure leads to an increase of some degrees in the pretilt angle, and this is essentially independent of the material used for the orientation layer.

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