Veb Werk Fuer Fernsehelektronik Im Veb Kombinat Mikroelektronik

Veb Werk Fur Fernsehelektronik Im Veb Kombinat Mikroelektronik

Veb Werk Fur Fernsehelektronik

Veb Werk Fuer Fernsehelektronik Im Ved Kombinat Mikroelektronik

Gerhard Pelzl

Horst Zaschke

Dietrich Demus

Herrmann Schubert

Carsten Tschierske

Frank Kuschel

Bak G Yong

Wolfgang Schafer

Wolfgang Weissflog

Horst Kresse

Saskia Kohler

Reinhard Paschke

Rudolf Wolff

Andreas Isenberg

Annelore Madicke

Hartmut Enzenberg

Carsten Tschirske

Klaus-Dieter Scherf

Ulrich Rosenfeld

Kristine Mohr

Barbara Kampa

Joachimi Detlev

Demus Dietrich

Willibald Schliemann

Barth Petra

Hans-Ulrich Nothnikz

Hans-Ulrich Nothni

2,5-substituted 1,3,4-thiadiazoles of the general formula ##STR1##

Liquid-crystalline, 2,5-disubstituted, 1,3,4-thiadiazoles with extended

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.

Ferroelectric liquid crystals

A mixing component for nematic liquid-crystalline substances used in optoelectronic components for the rendition of numbers, symbols and images. The object of the invention is to reduce, in components for nematic liquid crystal substances, the threshold and operating voltages. It has been found, that the addition of one or more 1-oxa-2,6,7-trioxane-1-phospha-bicyclo-derivatives having the general formula ##STR1## wherein ##STR2## with R.sup.1 =C.sub.n H.sub.2n+1 --, C.sub.n H.sub.2n+1 O--, C.sub.n H.sub.2n+1 COO--, C.sub.n H.sub.2n+1 OCOO--, R.sup.2 +C.sub.n H.sub.2n=1 -- with n=an integer from 1 to 10 to nematic liquid crystal substances, considerably reduces the operating voltage.

Mixing component for liquid crystal substances

The invention relates to liquid crystal compounds for the guest-host effect having a positive contrast, pure red color and exhibiting excellent stability. The compounds herein are derivatives of tetrazine of the general formula: ##STR1## in which m and n are 1 to 10. Other related compounds, mixtures and compositions thereof, and opto-electronic displays are described also.

Liquid crystal substances for the guest-host effect

A nematic liquid crystal compound adapted for the modulation of the transmitted or incident light and reproduction in color of numerals, symbols and images by electro-optical devices, the said compound having the formula ##STR1## wherein R.sup.1 .dbd.Br--, Cl--, C.sub.n H.sub.2n+1 --, C.sub.n H.sub.2n+1 O--, n being 1 to 10,

Nematic liquid crystal compounds

Liquid crystal compound for color modulation of light in electro-optical devices characterized by an oriented smectic C-phase with positive dielectric anisotropy. The compound has the property of a dichroitic dyestuff.

Liquid crystals for electro-optical devices

A nematic liquid crystal mixture for modulation of the transmitted or incident light and for rendition of colored numerals, symbols and images in electro-optical devices, the said mixture comprising

Nematic liquid crystal mixtures

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Halle-Neustadt, Germany

Gerhard Pelzl