Veb Werk Fur Fernsehelektronik Im Veb Kombinat Mikroelektronik

Veb Werk Fur Fernsehelektronik Berlin Im Veb Kombinat Mikroelektronik

Veb Werk Fuer Fernsehelektronik Berlin Im Veb Kombinat Mikroelektronik

Veb Werk Fuer Fernsehelektronik

Hans-Joachim Deutscher

Dietrich Demus

Horst Zaschke

Sabine Richter

Horst Kresse

Herrmann Schubert

Frank Kuschel

Adelbert Wiegeleben

Doris Pfeiffer

Roger Frach

Christina Seidel

Michael Schellenberger

Ute Boettger

New liquid-crystalline esters of the 4-[(4-alkyl-cyclohexyl)-methyl]-benzoic acids or cyclohexanecarboxylic acids which are suitable for electro-optical displays have the general formula ##STR1## wherein R.sup.1 =C.sub.n H.sub.2n+1

Liquid crystalline substances

Nematic liquid crystalline mixtures, which can be used in optoelectronic components. Compounds are provided which influence the characteristics of mixtures in the direction of high clarification temperatures at simultaneous favorable switching times. It has been found that compounds of the general formula ##STR1## wherein n, m=1 to 10 in nematic mixtures in quantities of 5 to 40% considerably increase the clarification points without significantly increasing the viscosity, so that favorable switching times are obtained. The new mixtures can be used for the production of optoelectronic components (displays) for watches, computers and other devices.

Nematic liquid crystal mixtures

What is described is an improved opto-electronic component and display which uses novel liquid crystal nematic substances for the control of the light transmission and for the display of numbers symbols and images. The novel nematic liquid crystal substances herein, which exhibit high clearing temperatures, low working temperatures and rapid switching times, are 7-alkyl-perhydrophenanthren-2-carboxylic acids and esters thereof.

Liquid-crystal nematic substances

This invention relates to new liquid crystal dihydrophenanthrene substances for utilization in electro-optical devices for the modulation of light as well as the representation of numerals, signs and images. It has been found that new liquid-crystal 7-n-alkyl-8, 10-dihydrophenanthrene-2-carboxylic acid esters of the general formula ##STR1## alone, in mixture with each other and/or in mixtures with other liquid crystal or non liquid crystal substances, yield good results when they are used in electro-optical components.

Liquid crystal dihydrophenanthrene substances

A nematic liquid crystal for modulating light in electrooptical devices comprises:

Nematic liquid crystal compounds and use and device for using the same

The invention describes nematic compositions for electrooptical devices for modulation of the transmitted or incident light and for the rendition of numbers, symbols and images as orientation in the spectroscopy and gas chromatography. The compositions comprise, liquid crystalline compounds such as dyestuffs and at least one of the compound having the following general formula: ##STR1## wherein ##STR2##

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Halle, Germany

Hans-Joachim Deutscher