Merck Patent Gmbh

Merck Patent Gesellschaft MIT Beschrankter Haftung

Merck Patent Gesellschaft MIT

Sven Schupfer

Harald Hirschmann

Volker Reiffenrath

Sabine Schoen

Peer Kirsch

Marcus Reuter

Martina Weidner

The invention relates to nematic liquid-crystal compositions comprising bisalkenyl compounds of the formula Iand to their use in plasma-addressed LCDs.

Nematic liquid-crystal composition

TN and STN liquid-crystal displays

Supertwist liquid crystal displays (STN displays) of excellent characteristics are obtained if the nematic liquid crystal mixtures used therein comprise at least one compound of the formula IA ##STR1## and at least one compound of the formula IB ##STR2## in which R.sup.a, R.sup.b, Z, L.sup.a, L.sup.b, L.sup.c, L.sup.d, L.sup.e, L.sup.f, L.sup.g, L.sup.h, R.sup.3, R.sup.4 are as defined below.

STN liquid crystal display

Supertwist liquid-crystal displays (SLCDs) with outstanding properties are obtained if the nematic liquid-crystal mixtures used therein comprise at least one compound selected from the formulae 1A and 1B ##STR1## and at least one compound of the formula 1C ##STR2## in which R.sup.a is alkyl, alkoxy, alkenyl or alkenyloxy having 1 to 12 carbon atoms,

STN liquid-crystal display

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Aschaffenburg, Germany

Sven Schupfer