Merck Patent Gesellschaft MIT Beschrankter Haftung

Hiroki Yoshitake

Herbert Plach

Georg Weber

Hans A Kurmeier

Eike Poetsch

Reinhard Hittich

Bernhard Scheuble

Bernhard Rieger

Takamasa Oyama

Klaus P Stahl

Atsushi Sawada

Volker Reiffenrath

Ulrich Finkenzeller

Hiroshi Numata

Thomas Jacob

Supertwist liquid crystal displays having very short switching times are obtained if the nematic liquid crystal mixture contains at least one component chosen from group A consisting of compounds of the formulae AI to AVI:

Supertwist liquid crystal display

Supertwist liquid crystal displays having very short switching times are obtained if the nematic liquid crystal mixture contains at least one component chosen from group A consisting of compounds of the formulae AI to AVI: ##STR1## wherein R.sup.1 and R.sup.2 in each case independently of one another are each R and R is alkyl having 1-12 C atoms, wherein one or two non-adjacent CH.sub.2 groups can also be replaced by --O--, --CH.dbd.CH--, --CO--, --O--CO-- or --CO--O--, and up to four other components.

The invention relates to a nematic liquid-crystal composition especially for active matrix displays with high voltage holding ratio, good low temperature stability and without reversed domains.

Nematic liquid-crystal composition

The invention relates to a liquid-crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, characterized in that it contains one or more compounds of the general formula I ##STR1## in which r is o or 1, Q.sup.1 is --CH.sub.2 CH.sub.2 -- or a single bond, A is 1,4-phenylene or trans-1,4-cyclohexylene, L is H or F, R is alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, in each case having up to 7 carbon atoms and X is F, CF.sub.3, or OCF.sub.2 H.

Liquid crystalline medium

Supertwist liquid-crystal displays having excellent properties are obtained using a nematic liquid-crystal mixture based on component A which contains

Supertwist liquid-crystal display

Growing community of inventors

Atsugi, Japan

Hiroki Yoshitake