Patent · US Expired

Device and method for the temperature-independent operation of electro-optical switches on the basis of ferroelectric liquid crystals having a deformed helix

US6900874B1 · kind B1 · utility

1Cited by

4References

4Claims

0Family size

Assignee

DEUTSCHE TELEKOM AG · DE

Inventors

Wolfgang Dultz · Frankfurt am Main, DE
Dirk Ganzke · Darmstadt, DE
Wolfgang Haase · Reinheim, DE
Eugene Pozhidaev · Kashkhatau, RU

Key dates

Filing date	Aug 24, 2000
Grant date	May 31, 2005
Priority date	—
Expiry date	Jan 4, 2021

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/1414
WIPO fieldOptics
WIPO sectorInstruments

Abstract

In order to substantially reduce temperature-dependent influences and attendant long switching times in the case of an optical liquid crystal modulator having at least one ferroelectric liquid crystal and in a method for operating an optical liquid crystal modulator, the ferroelectric liquid crystals are provided to have a DHF mode and to exhibit an operating range of an electric field of more than 20 V/μm at the location of the liquid crystal.

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