Veb Werk Fuer Fernsehelektronik Im Veb Kombinat Mikroelektronik

Carsten Tschierske

Dietrich Demus

Horst Zaschke

Gerhard Pelzl

Horst Kresse

Wolfgang Schafer

Bak G Yong

Maike Hettrich

Annelore Madicke

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

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

Liquid crystalline 2,6-disubstituted trans-1,3-dioxadecalins of the general formula ##STR1## are well suited as components of low double refraction for mixtures which are utilized in opto-electronic components.

Liquid crystalline 2,6-disubstituted-trans-1,3-dioxadecalins

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

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Halle, Germany

Carsten Tschierske