Patent · US Expired

Ferroelectric liquid crystal display with liquid crystal mixtures having high spontaneous polarization and short helical pitch and alignment layers containing lipophilic or amphiphilic compounds

US5373380A · kind A · utility

8Cited by

1References

6Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Takamasa Harada · Oberursel, DE
Claus Escher · Mühltal, DE
Gerd Illian · Tokyo, JP
Anke Kaltbeitzel
Norbert Rosch · Frankfurt am Main, DE

Key dates

Filing date	Apr 15, 1993
Grant date	Dec 13, 1994
Priority date	—
Expiry date	Apr 15, 2013

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/141
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Ferroelectric liquid crystal display comprising outer substrates, electrodes, polarizer(s), ferroelectric liquid crystalline material and alignment layer(s), in which the ferroelectric liquid crystalline material has a spontaneous polarization of Ps>20 nC.cm.sup.-2 and a natural helical pitch of less than half of the cell thickness, and the alignment layer comprises at least one lipophilizing, lipophilic and/or amphiphilic compound. The liquid crystal display according to the invention exhibits a short switching time and a significantly reduced surface memory effect, and thus achieves an improved display contrast.

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