Rolic Ag

Niopic Moscow Research and Production Association

Hoffmann-la Roche Inc.

Victor V Titov

Martin Schadt

Vladimir G Chigrinov

Nina I Chernova

Marina V Loseva

Arnold Z Rabinovich

Alexander V Ivashchenko

Leonid A Beresnev

Evgeniv P Pozhidaev

Dmitry I Dergachev

Boris I Ostrovskiv

Richard Buchecker

Vladimir F Petrov

Assya I Pavluchenko

Natalia I Smirnova

A liquid crystal display cell comprising a chiral ferroelectric smectic liquid crystal layer whose helix structure is influenced by the action of an electric field such that its optical anisotropy alters; a pair of transparent plates between which the liquid crystal is disposed and which have a surface structure for aligning the molecule of the liquid crystal and are provided with electrodes to produce an electric field therein; and one polarizer each before and after the liquid crystal, such that a ratio d/p of the thickness d of the liquid crystal layer to the pitch height p of the helical twisting is greater than 5, the smectic tilt angle &thgr; between 0.39 radians and 0.87 radians and the product d&middot;&thgr; &middot;&Dgr;n&middot;1/&lgr; (phase factor) of the thickness d, the square of the tilt angle &thgr;&deg;, the value of the birefringence &Dgr;n and the reciprocal of the wavelength &lgr; of light bending is greater than 0.45 radians .

Distorted helix ferroelectric liquid crystal cell

A liquid crystal display cell comprising a chiral ferroelectric smectic liquid crystal layer whose helix structure is influenced by the action of an electric field such that its optical anisotropy alters; a pair of transparent plates between which the liquid crystal is disposed and which have a surface structure for aligning the molecule of the liquid crystal and are provided with electrodes to produce an electric field therein; and one polariser each before and after the liquid crystal: such ratio d/p of the thickness d of the liquid crystal layer to the pitch height p of the helical twisting is greater than 5, the smectic tilt angle .theta..sub.o is being between 22.5 .degree. and 50.degree. and the product d..theta..sub.o.sup.2..DELTA.n.1/.lambda. (phase factor) of the thickness d, the square of the tilt angle .theta..sub.o, the value of the birefringence .DELTA.n and the reciprocal of the wavelength .lambda. of light bedding is greater than 0.45 .mu.m.

Ferroelectric liquid crystal cell

A liquid crystal display cell comprising a chiral ferroelectric smectic liquid crystal layer whose helix structure is influenced by the action of an electric field such that its optical anisotropy alters; a pair of transparent plates between which the liquid crystal is disposed and which have a surface structure for aligning the molecule of the liquid crystal and are provided with electrodes to produce an electric field therein; and one polariser each before and after the liquid crystal: such ratio d/p of the thickness d of the liquid crystal layer to the pitch height p of the helical twisting is greater than 5, the smectic tilt angle .theta..sub.o is being between 22.5.degree. and 50.degree. and the product d.multidot..theta..sub.o.sup.2 .multidot..DELTA.n.multidot.l/.lambda. (phase factor) of the thickness d, the square of the tilt angle .theta..sub.o, the value of the birefringence .DELTA.n and the reciprocal of the wavelength .lambda. of light bedding is greater than 0.45 .mu.m.

Compounds of the formula ##STR1## wherein R.sup.1 is alkyl or trans-4-alkylcyclohexyl and

Liquid crystalline mixtures containing 2-(2-fluorophenyl) pyridines

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Moscow, Russia

Victor V Titov