A liquid crystal composition includes a polymerizable compound (or polymer) and a polar compound, where the homeotropic alignment of liquid crystal molecules can be achieved by the action of these compounds, and a liquid crystal display device includes such a composition. A nematic liquid crystal composition has positive dielectric anisotropy and includes a polymerizable compound as a first additive and a polar compound as a second additive, and the composition may include a specific liquid crystal compound having a large positive dielectric anisotropy and a specific liquid crystal compound having a high maximum temperature or a small viscosity, and a liquid crystal display device includes such a composition.

A liquid crystal composition includes at least one compound of general formula I and at least one compound selected from a group consisting of the compounds of general formula II-1 and general formula II-2. The liquid crystal composition provided by the present invention has suitable optical anisotropy, high clearing point, high elastic constants K.sub.11 and K.sub.33, and relatively low dielectric anisotropy. When the liquid crystal composition is applied to a liquid crystal display device, the liquid crystal display device may have better weather resistance and higher contrast ratio.

##STR00001##

The present invention provides a liquid crystal composition and a liquid crystal display device thereof. The liquid crystal composition comprises at least one compound of general formula I and at least one compound of general formula II. The liquid crystal composition has a larger vertical dielectric constant (.sub.), a larger ratio of the vertical dielectric constant to the absolute value of dielectric anisotropy (.sub./||), a larger K.sub.ave value and a higher transmittance while maintaining an appropriate clearing point, an appropriate optical anisotropy, and an appropriate absolute value of the dielectric anisotropy, such that the liquid crystal display device comprising the same has a better contrast, a faster response speed and a better transmittance while maintaining an appropriate range of operating temperature and an appropriate threshold voltage.

##STR00001##

Provided is a liquid crystal display device comprising a first substrate, a second substrate, and a liquid crystal composition disposed between said first substrate and said second substrate, wherein a surface of said first substrate in contact with said liquid crystal composition is provided with an alignment layer, while said second substrate has no alignment layer; and said liquid crystal composition comprises a liquid crystal compound, a self-aligning agent, and a polymerizable compound represented by Formula I,

##STR00001##

The present invention relates to a liquid crystal (LC) medium comprising a terphenyl compound and at least two polymerisable compounds, to a process for its preparation, to its use for optical, electro-optical and electronic purposes, in particular in LC displays, especially in an LC display of the polymer sustained alignment (PSA) type, and to an LC display, especially a PSA display, comprising it.

A LC lens and a liquid-crystal medium used in said LC lens, wherein the medium contains one or more compounds of each of formulae I and II

##STR00001##

Disclosed are a liquid crystal composition and a liquid crystal display component. The liquid crystal composition comprises one or more compounds as represented by structural formula I-1 and/or one or more compounds as represented by structural formula I-2, one or more compounds as represented by structural formula II, and one or more compounds as represented by structural formula III:

##STR00001##

The liquid crystal display component includes the liquid crystal composition. The liquid crystal composition has a lower viscosity, can achieve a fast response, and further has a moderate dielectric anisotropy , a moderate optical anisotropy n, and a high stability to heat and light. The liquid crystal display component including the liquid crystal composition has the characteristics of a broader nematic phase temperature range, a suitable birefringence anisotropy, a very high electrical resistivity, a good anti-ultraviolet property, a high charge retention ratio, and a fast response.

Provided are a liquid crystal composition satisfying at least one of characteristics including a high maximum temperature, a low minimum temperature, small viscosity, suitable optical anisotropy and large negative dielectric anisotropy, or the liquid crystal composition having a suitable balance regarding at least two of the above 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 component having high maximum temperature or small viscosity as a third component, a specific component having negative dielectric anisotropy as a fourth component, or a specific compound having a polymerizable group as an additive.

Disclosed are a liquid crystal composition and a display element or display using the liquid crystal composition, wherein the liquid crystal composition contains one or more compounds of general formulas I, II and III, ##STR00001##
The liquid crystal composition disclosed in the present invention has an excellent performance, an optical anisotropy in the range of 0.080 to 0.150, a low rotary viscosity, a fast response time, and good chemical, optical and thermal stabilities, and is very suitable for manufacturing liquid crystal display elements, particularly suitable for active matrix display elements, such as active matrix displays using a VA, FFS or IPS mode.

The present invention relates to liquid-crystal (LC) media as defined in claim 1, to the use thereof for optical, electro-optical and electronic purposes, in particular in LC displays, and to LC displays containing said LC media. The invention in particular relates to LC media with improved response time that enable energy saving displays.