Abstract: Disclosed are dibenzofuran and dibenzothiophene derivatives of the general formula I, in which X1, X2, W, Y, R, A, Z and m have the meaning defined in claim 1, to a process for the preparation thereof, to the use thereof as components in liquid-crystalline media, and to electro-optical display elements which contain the liquid-crystalline media according to the invention.

Abstract: The invention relates to compounds of the formula I, to a liquid-crystalline medium which comprises at least one compound of the formula I, in which R1, R1*, L1, L2, L3 and L4 have the meanings indicated herein, and to the use thereof for an active-matrix display, in particular based on the VA, PSA, PS-VA, PM-VA, PALC, IPS, PS-IPS, SA-VA, SS-VA, FFS or PS-FFS effect.

Abstract: 4,6-difluorodibenzofuran derivatives of the formula I the preparation thereof, the use thereof as components in liquid-crystalline media and electro-optical display elements which contain the liquid-crystalline media.

Abstract: Compounds containing at least one C—C triple bond within a chain of at least 3 ring systems which have positive dielectric anisotropy, the use thereof for high-frequency components, liquid-crystalline media containing these compounds, and high-frequency components, in particular antennae, especially for the gigahertz region, containing these media. The liquid-crystalline media serve, for example, for the phase shifting of microwaves for tuneable phased-array antennae.

Abstract: The present invention relates to liquid-crystalline media comprising one or more compounds of formula G and one or more compounds selected from the group of compounds of formulae I, II and III, 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.

Abstract: A liquid-crystalline medium having a nematic phase, a dielectric anisotropy of 0.5 or more and a ratio of the dielectric constant perpendicular to the director (??) to the dielectric anisotropy (??), i.e. (??/??), of 2.0 or less and comprises one or more compounds of formula I wherein the parameters have the meaning given in the text. An electro-optical display containing such a medium, particularly in an active-matrix display based on the IPS or FFS effect. Methods for using of the compounds of formula I for improvement of the transmission and/or response times of a liquid-crystalline medium which comprises one or more additional mesogenic compounds.

Abstract: The present invention relates to liquid-crystalline media comprising—one or more compounds of formulae CC and/or CP and—one or more compounds selected from the group of compounds of formulae (I), (II) and (III), 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.

Abstract: A liquid-crystalline medium, preferably having a nematic phase and dielectric anisotropy of 0.5 or more, which has one or more compounds of formula S in which denotes and the other parameters have the meanings given in the text. Also, the use of the medium in an electro-optical display, particularly in an active-matrix display based on the IPS or FFS effect. Displays of this type which contain a liquid-crystalline medium of this type. And use of the compounds of formula S for the improvement of the transmission and/or response times of a liquid-crystalline medium which comprises one or more additional mesogenic compounds.

Abstract: Compounds containing at least one C—C triple bond within a chain of at least 3 ring systems which have positive dielectric anisotropy, the use thereof for high-frequency components, liquid-crystalline media containing these compounds, and high-frequency components, in particular antennae, especially for the gigahertz region, containing these media. The liquid-crystalline media serve, for example, for the phase shifting of microwaves for tuneable phased-array antennae.

Abstract: A liquid-crystal medium containing a component A of one or more compounds of formula X the preparation thereof, and the use of these liquid-crystal media, in particular in components for high-frequency technology, and components of this type which contain the media, and the production and use of these components. The components are suitable for phase shifters in the microwave and millimeter wave region, for microwave and millimeter wave array antennae and for tuneable reflectarrays.

Abstract: The present invention relates to compounds of the formula I where one or more of the radicals A1-5 denote a 1,4-naphthylene or 1,4- or 9,10-anthracenylene radical, and the other parameters are as defined in Claim 1. The invention additionally includes liquid-crystalline media which comprise the title compounds, and components for high-frequency technology which comprise these media, in particular phase shifters and microwave array antennae.

Abstract: The present invention relates to a liquid-crystal medium which comprises a component A which consists of one or more compounds of the formula I in which the parameters have the respective meanings given in the claims or in the text, and to the corresponding, novel mesogenic compounds and to the preparation thereof. The present invention likewise relates to the use of these liquid-crystal media, in particular in components for high-frequency technology, and to components of this type which contain media according to the invention, and to the production and use of these components. The components according to the invention are suitable, in particular, as phase shifters in the microwave and millimeter wave region, for microwave and millimeter wave array antennae and very particularly for so-called tuneable “reflectarrays”.

Abstract: The invention relates to liquid-crystalline mixtures comprising at least one compound of the formula I, in which X, L1, L2, L3, L4 and alkenyl have the meanings indicated in claim 1, in order to increase the pretilt at the polyimide surface, and to liquid-crystalline media comprising one or more compounds of the formula I in electro-optical liquid-crystal displays and in LC lenses.

Abstract: 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, in which the parameters R1-R3, Z21, Z31, Z32 and rings A11, A12, A13, A21, A22, A31, and A32 are as defined herein, and to components comprising these media for high-frequency technology, in particular phase shifters and microwave array antennas.

Abstract: The invention relates to an electro-optical liquid-crystal display having a re-alignment layer for the re-alignment of the liquid crystals whose field has a component, crucial for the re-alignment, parallel to the liquid-crystal layer, containing a liquid-crystalline medium, characterized in that it contains at least one compound of the formula (I), at least one compound of the formula (II), and at least one compound of the formula (III), in which the parameters R11 to R31, X11 and X21 have the meanings indicated in Claim 1.

Abstract: The present invention relates to liquid crystal media and to high frequency components comprising same, especially microwave components for high-frequency devices, such as devices for shifting the phase of microwaves.

Abstract: 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, in which the parameters R1-R3, Z21, Z31, Z32 and rings A11, A12, A13, A21, A22, A31, and A32 are as defined herein, and to components comprising these media for high-frequency technology, in particular phase shifters and microwave array antennas.

Abstract: The present invention relates to a liquid-crystalline medium (LC medium), to the use thereof for electrooptical purposes and to LC displays comprising this medium.

Abstract: The present invention relates to a device for high-frequency technology, or for the microwave region and millimeter wave region of the electromagnetic spectrum, characterized in that it contains a liquid-crystal medium which consists of one or more compounds, which one or more compounds, which contain 6 to 15 five-, six- or seven-membered rings, preferably 1,4-linked phenylene rings, or in that it contains a liquid-crystal medium which itself comprises a component A, which itself consists of one or more of the said compounds, which one or more compounds, which contain 6 to 15 five-, six- or seven-membered rings, preferably 1,4-linked phenylene rings. The present invention additionally relates to compounds of the formula (I), in which the parameters have the meanings given in the text, and to the corresponding, novel liquid-crystal media, to the use and preparation thereof, and to the production and use of the devices.

Abstract: The present invention relates to dielectrically positive liquid-crystalline media comprising one or more compounds of the formula I, and one or more compounds selected from the group of the compounds of the formulae II and III and/or IV, 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.