The present invention relates to a liquid crystal (LC) medium comprising a compound of formula I

##STR00001## and one or more compounds selected from the group of compounds of the formulae IIA, IIB, IIC and IID,

##STR00002## as defined in claim 1, and to the use of the LC medium for optical, electro-optical and electronic purposes, in particular in LC displays, especially in IPS, FFS, VA or PS-VA displays.

The invention relates to dielectrically positive liquid crystalline media comprising a compound of formula I ##STR00001##
wherein the parameters have the meaning given in claim 1 and to liquid crystal displays comprising these media, especially to active matrix displays and in particular to TN and IPS mode displays.

The present invention relates to liquid-crystalline media comprising one or more compounds selected from the group of compounds of formulae I, II and III, ##STR00001##
in which the parameters R.sup.1-R.sup.3, Z.sup.21, Z.sup.31, Z.sup.32 and rings A.sup.11, A.sup.12, A.sup.13, A.sup.21, A.sup.22, A.sup.31, and A.sup.32 are as defined herein, and to components comprising these media for high-frequency technology, in particular phase shifters and microwave array antennas.

The present invention relates to liquid-crystalline media comprising one or more polymerisable compounds, preferably of formula P
P.sup.a-(Sp.sup.a).sub.s1-(A.sup.1-Z.sup.1).sub.n1-A.sup.2-Q-A.sup.3-(Z.sup.4-A.sup.4).sub.n2-(Sp.sup.b).sub.s2-P.sup.bP
and one or more compounds selected from the group of compounds of formulae I, II, and III, ##STR00001##
in which the parameters have the meaning indicated in Claim 1, and to components comprising these media for high-frequency technology, in particular phase shifters and microwave array antennas.

Disclosed herein is a liquid crystal mixture applied in light modulating devices, comprising: component A comprised of one or more compounds selected from the group of compounds of formula (I), component B comprised of one or more compounds selected from the group of compounds of formula (II), and component C comprised of one or more chiral compounds. Also disclosed is a light modulating device containing the liquid crystal mixture, wherein the liquid crystal mixture has higher stability of electrical performance and the light modulating device has improved optical performance. ##STR00001##

The present invention relates to a liquid crystal (LC) medium comprising a compound of formula I ##STR00001## and one or more compounds selected from the group of compounds of the formulae IIA, IIB, IIC and IID, ##STR00002## as defined in claim 1, and to the use of the LC medium for optical, electro-optical and electronic purposes, in particular in LC displays, especially in IPS, FFS, VA or PS-VA displays.

A liquid crystal display device includes a liquid crystal panel that includes a liquid crystal layer containing a liquid crystal composition; and a light source that emits light on the liquid crystal panel, the liquid crystal composition containing at least one of a first liquid crystal compound containing a phenyl group and a conjugated bond group that forms a conjugated system continuous with the phenyl group and a second liquid crystal compound containing an alkenyl group not forming a conjugated system, the light source emitting green light having a half width of less than 50 nm.

The present invention relates to liquid-crystalline media comprising one or more compounds of formula DFS

##STR00001##

in which the groups and parameters occurring have the meanings indicated in claim 1, to high-frequency components comprising same, especially microwave components for high-frequency devices, such as devices for shifting the phase of microwaves, in particular for microwave phased-array antennas. The present invention further relates to novel mesogenic compounds.

The invention relates to dielectrically positive liquid crystalline media comprising a compound of formula I

##STR00001##

wherein the parameters have the meaning given in claim 1 and to liquid crystal displays comprising these media, especially to active matrix displays and in particular to TN and IPS mode displays.

The present invention relates to dielectrically positive liquid-crystalline media comprising one or more compounds of the formula I and/or TINUVIN 770,

##STR00001##

in which the parameters have the respective meanings indicated in the specification, and optionally one or more further dielectrically positive compounds and optionally one or more further dielectrically neutral compounds, and to liquid-crystal displays, especially active-matrix displays and in particular TN, IPS and FFS displays, containing these media.