The liquid crystal composition has the nematic phase and contains a specific compound having large positive dielectric anisotropy as a first component, and a specific compound having small viscosity as a second component, and may contain a specific compound having large positive dielectric anisotropy as a third component, a specific compound having a high maximum temperature or large positive dielectric anisotropy as a fourth component, or a specific compound having negative dielectric anisotropy as a fifth component, and a liquid crystal display device includes the composition.

Shown is a liquid crystal composition satisfying at least one of characteristics such as high maximum temperature, low minimum temperature, small viscosity, suitable optical anisotropy, large dielectric anisotropy and small frequency dependence, or has a suitable balance regarding at least two of the characteristics, and an AM device including the composition. The liquid crystal composition contains a specific compound having large positive dielectric anisotropy as a first component, and a specific compound having small viscosity as a second component, and may contain a specific compound having high maximum temperature or small viscosity as a third component, a specific compound having positive dielectric anisotropy as a fourth component or a specific compound having negative dielectric anisotropy as a fifth component.

Shown is a liquid crystal composition satisfying at least one of characteristics such as a high maximum temperature, a low minimum temperature, a small viscosity, a suitable optical anisotropy and a large dielectric anisotropy, or has a suitable balance regarding at least two of the characteristics, and an AM device including the composition. The liquid crystal composition contains a specific compound having large negative dielectric anisotropy as a first component, and a specific compound having small viscosity as a second component, and may contain a specific compound having negative dielectric anisotropy as a third component, a specific compound having a high maximum temperature or small viscosity as a fourth component or a specific compound having a polymerizable group as an additive component.

The instant invention relates to liquid crystalline media comprising a chiral component, component A, consisting of one or more chiral compounds, optionally, a bimesogenic component, component B, consisting of one or more bimesogenic compounds, a liquid crystalline component, component C, consisting of one or more liquid crystalline, respectively mesogenic compounds, and a reactive mesogenic component, component D, comprising, one or more reactive mesogenic compounds,
as defined in claim 1, to their stabilization by polymerization and to the polymer-stabilised liquid crystal materials, as well as to liquid crystal displays comprising these liquid crystal media, respectively these stabilized materials, especially to USH-displays and in particular to active matrix displays and, last not least, to the processes of preparation of the respective composite systems and of the displays comprising these systems.

The present invention relates to benzotriazole derivatives selected from the group of compounds of formulae Ia, Ib and Ic as defined in claim 1, to mesogenic media comprising the compounds of formulae Ia, Ib and Ic, and to the use of these compounds and mesogenic media in optical, electronic and electro-optical applications, in particular in devices for regulating the passage of energy from an outside space into an inside space, for example in windows.

The present invention relates to a liquid crystal display device including a specific liquid crystal composition and a sealant in which a cured product of a specific curable resin composition is used. The present invention provides a liquid crystal display device which prevents a decrease in the voltage holding ratio (VHR) of the liquid crystal layer and which enables elimination of problematic defective display such as voids, uneven alignment, and screen burn-in. Since the liquid crystal display device of the present invention prevents a decrease in the voltage holding ratio (VHR) of the liquid crystal layer and enables a reduction in defective display such as uneven alignment and screen burn-in, it is particularly useful for active-matrix liquid crystal display devices of a VA mode and PSVA mode and can be applied to liquid crystal display apparatuses such as liquid crystal TVs, monitors, mobile phones, and smartphones.

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

##STR00001## in which

##STR00002##

denotes

##STR00003##

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.

A liquid crystal composition, comprising, at least one compound represented by Formula 1-A:

##STR00001##

wherein, in the Formula 1-A, R—*, R.sup.1—*, Q—*, *—Z1-*, *—Z2-*,

##STR00002##

n1, n2, n3, n4, L1-*, L2-*, L3-*, L4-*, L5-*, L6-*, L7-*, and L8-* are the same as defined in the specification, and * is defined as a bonding site to a neighboring atom.

A liquid crystal composition, and a liquid crystal display element or liquid crystal display including the liquid crystal composition and belonging to the field of liquid crystal display. The liquid crystal composition includes a compound represented by formula I, a compound represented by formula II, one or more compounds represented by formula III, and at least one polymerizable compound. The liquid crystal composition simultaneously has a low rotary viscosity, a large refractive index, and a fast response speed. ##STR00001##

A liquid crystal display device comprises a first substrate, a second substrate which faces the first substrate, an electrode part which is provided on at least one of the first substrate and the second substrate, and a liquid crystal layer which comprises a liquid crystal composition and is provided between the first substrate and the second substrate. The liquid crystal composition includes a liquid crystal compound of Formula 1. ##STR00001##
wherein R.sub.1, R.sub.2, A.sub.11, A.sub.12, A.sub.13, A.sub.21, A.sub.22, Z.sub.11, Z.sub.12, Z.sub.13, Z.sub.21, Z.sub.22, a, b, c, d, and e are as described herein.