Patent · US Expired

Ferroelectric liquid crystal display having gray steps or a continuous gray scale

US5257122A · kind A · utility

18Cited by

5References

6Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Hans-Rolf Dubal · Königstein, DE
Claus Escher · Mühltal, DE
Gerhard Illian · Frankfurt am Main, DE
Mikio Murakami · Kakegawa, JP
Dieter Ohlendorf · Liederbach, DE

Key dates

Filing date	Nov 27, 1991
Grant date	Oct 26, 1993
Priority date	—
Expiry date	Nov 27, 2011

Classification

Technology area (CPC G)Physics
CPC primaryG02F2203/30
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A ferroelectric liquid crystal switching or display device, in which the liquid crystal film has a constant thickness, wherein one of the glass sheets in the device is planar and the other glass sheet has at least one step. The switching or display device of the present invention does not require shortened switching times or more contacts or drivers and does not show unwanted switching.

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