The present invention relates to liquid-crystalline media comprising one or more chiral compounds 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.

The present invention relates to liquid-crystalline media comprising one or more chiral compounds 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.

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 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.

Liquid-crystalline media comprising one or more compounds of formula T ##STR00001##
as defined in claim 1, and high-frequency components comprising these media, especially microwave components for high-frequency devices, such as devices for shifting the phase of microwaves, tunable filters, tunable metamaterial structures, and electronic beam steering antennas, e.g. phased array antennas.

Liquid-crystalline media comprising one or more compounds of formula T ##STR00001##
as defined in claim 1, and high-frequency components comprising these media, especially microwave components for high-frequency devices, such as devices for shifting the phase of microwaves, tunable filters, tunable metamaterial structures, and electronic beam steering antennas, e.g. phased array antennas.

There is provided a liquid crystal composition containing at least one compound represented by General Formula (a). There is also provided a liquid crystal display device using such a liquid crystal composition. The liquid crystal composition of the present invention has the following properties without suffering reductions in refractive index anisotropy (Δn) and nematic phase-isotropic liquid phase transition temperature (T.sub.ni): sufficiently low viscosity (η), sufficiently low rotational viscosity (γ.sub.1), a large elastic constant (K.sub.33), a high voltage holding ratio after UV exposure (VHR (UV)), and a negative dielectric anisotropy (Δ∈) with a large absolute value. A liquid crystal display device of, for example, a VA type that uses such a liquid crystal composition has a high response speed and excellent display quality with defective display being eliminated or reduced.

##STR00001##

Liquid-crystalline media comprising one or more compounds of formula G ##STR00001##
and one or more compounds selected from the group of compounds of formulae I, II and III, ##STR00002##
in which the parameters have the meaning indicated in claim 1, and components comprising these media, are suitable for use in high-frequency technology, in particular, in phase shifters and microwave array antennas.

Liquid-crystalline media comprising one or more compounds of formula G ##STR00001##
and one or more compounds selected from the group of compounds of formulae I, II and III, ##STR00002##
in which the parameters have the meaning indicated in claim 1, and components comprising these media, are suitable for use in high-frequency technology, in particular, in phase shifters and microwave array antennas.

Provided is a polarizing plate for a light-emitting diode and a light-emitting display device including the same, the polarizing plate comprising a polarizing film and a liquid crystal retardation film, wherein the liquid crystal retardation film comprises a laminate made of: a second retardation film having a discotic liquid crystal of which an in-plane retardation Re, in a wavelength of 550 nm, is approximately 220 nm to approximately 280 nm and a biaxial degree (NZ) is approximately 0 to approximately 0.3; and a first retardation film having a nematic liquid crystal of which an in-plane retardation Re, in a wavelength of 550 nm, is approximately 100 nm to approximately 150 nm and a biaxial degree (NZ) is approximately 0.3 to approximately 0.7.