Abstract: Fast-switching displays with memory properties are provided, which can display digits, symbols, and images, and which contain as chemically and thermally stable ferroelectric liquid crystalline substances, according to the invention, liquid crystalline derivatives which contain a chiral alkyl halide residue corresponding to the general formula ##STR1## are used in mixtures of one another as well as in conjunction with other liquid crystalline or non-crystalline liquid substances.
Type:
Grant
Filed:
February 3, 1988
Date of Patent:
October 17, 1989
Assignee:
VEB Werk fuer Fernsehelektronik im VEB Kombinat Mikroelektronik
Inventors:
Bak G. Yong, Barth Petra, Demus Dietrich, Joachimi Detlev, Barbara Kampa, Saskia Kohler, Kristine Mohr, Reinhard Paschke, Gerhard Pelzl, Ulrich Rosenfeld, Wolfgang Schafer, Klaus-Dieter Scherf, Carsten Tschirske, Wolfgang Weissflog, Horst Zaschke
Abstract: 2,5-substituted 1,3,4-thiadiazoles of the general formula ##STR1##The aforementioned compounds are used in amounts of 0.1 to 80 mole percent in mixtures for electrooptical arrangements for the modulation of transmitted and reflected light, as well as for the colored or black-and-white display of numerals, symbols and moving or still pictures. The compounds endow the liquid-crystalline mixtures with an extended phase field of the smectic C phase, negative dielectric anisotropy and the property of forming optically active C phases upon admixture with optically active compounds.
Type:
Grant
Filed:
June 20, 1988
Date of Patent:
August 28, 1990
Assignee:
VEB Werk fuer Fernsehelektronik im VEB Kombinat Mikroelektronik
Inventors:
Bak G Yong, Dietrich Demus, Horst Kresse, Annelore Madicke, Gerhard Pelzl, Wolfgang Schafer, Carsten Tschierske, Horst Zaschke
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