A liquid crystal compound represented by general formula F is useful as a liquid crystal composition and as a liquid crystal display device that contains the liquid crystal composition. The liquid crystal compound has a large clearing point, large optical anisotropy and sizable or large dielectric anisotropy absolute value under the condition of maintaining a suitable rotary viscosity, enabling the liquid crystal composition that contains the compound represented by general formula F has a large optical anisotropy, small rotational viscosity, high VHR (UV) and long low-temperature storage duration under the condition of maintaining proper clearing point, proper dielectric anisotropy absolute value and proper VHR (initial), and the liquid crystal display device that contains the liquid crystal composition of the present invention has good contrast, high response speed, high reliability and good low-temperature storage stability.

LCoS panels using liquid crystal (LC) media having negative dielectric anisotropy and to the LC media comprised therein. The liquid crystal medium (LC medium) is a negative dielectric anisotropy liquid crystal material having high optical anisotropy. It is particularly useful in electro-optical displays including projection systems based on vertical alignment (VA) nematic panels.

The present invention relates to liquid-crystal (LC) media as defined in claim 1, having negative dielectric anisotropy and to the use thereof for optical, electro-optical and electronic purposes, in particular in LC displays.

The present disclosure provides a liquid crystal composition and a display panel using the same. The liquid crystal composition includes a first compound represented by formula (I), a second compound represented by formula (II), a third compound represented by formula (III), and a fourth compound represented by formula (IV).

##STR00001##

A liquid-crystal (LC) medium or LC material based on a mixture of polar compounds, its use for optical, electro-optical and electronic purposes, in particular in LC displays, especially in LC displays of the vertically aligned mode and/or the fringe-field switching mode, an LC display of the vertically aligned mode and/or the fringe-field switching mode comprising the LC medium, especially an energy-saving LC display, and a process of manufacturing the LC display.

A liquid crystal compound represented by general formula F is useful as a liquid crystal composition and as a liquid crystal display device that contains the liquid crystal composition. The liquid crystal compound has a large clearing point, large optical anisotropy and sizable or large dielectric anisotropy absolute value under the condition of maintaining a suitable rotary viscosity, enabling the liquid crystal composition that contains the compound represented by general formula F has a large optical anisotropy, small rotational viscosity, high VHR (UV) and long low-temperature storage duration under the condition of maintaining proper clearing point, proper dielectric anisotropy absolute value and proper VHR (initial), and the liquid crystal display device that contains the liquid crystal composition of the present invention has good contrast, high response speed, high reliability and good low-temperature storage stability. ##STR00001##

The present invention provides a liquid crystal composition and a liquid crystal display device. The liquid crystal composition comprises at least one compound of general formula I, at least one compound of general formula II and at least one compound of general formula III. The liquid crystal composition provided in the present invention has an appropriate optical anisotropy, an appropriate clearing point, an appropriate absolute value of dielectric anisotropy, a larger K value, a smaller rotational viscosity, a shorter response time, a higher transmittance, a higher contrast rate and a longer low-temperature storage time, and a liquid crystal display device prepared thereby has excellent performances and is suitable for fast-response, high-contrast VA, IPS, NFFS display modes and the like.

The present invention discloses photosensitive chiral agent compound S, a cholesteric liquid crystal composition containing the photosensitive chiral agent compound S, and the use of the cholesteric liquid crystal composition in a liquid crystal display element and a liquid crystal display. The photosensitive chiral agent compound S has the properties of high HTP value, good solubility, and short switching time. The cholesteric liquid crystal composition comprising the photosensitive chiral agent compound S has high reflectance retention ratio, which ensures RGB color uniformity and does not require complicated pixel design; low viscosity, which ensures compatibility with existing large-scale panel fabrication processes; and fast UV-induced color switching speed, which results in reduced time during the UV process and lowered production costs. The photosensitive chiral agent compound S can be widely used in optical devices such as liquid crystal electronic books and outdoor and vehicle-mounted displays.

##STR00001##

The present invention provides a self-aligning agent and a liquid crystal composition thereof. The liquid crystal composition comprising the self aligning agent of general formula O in the present invention has a lower residue concentration, a smaller roughness, a better alignment effect as well as a better low-temperature storage stability and a better pre-tilt angle stability while maintaining an appropriate clearing point, an appropriate optical anisotropy, an appropriate absolute value of dielectric anisotropy, a larger K value (K.sub.11 and K.sub.33) and a smaller rotational viscosity.

##STR00001##

A method for reducing white flicker by bringing together into a composition one or more compounds of formula G with one or more compounds of formula B and/or C to form a liquid crystal (LC) medium having negative dielectric anisotropy, wherein the reduction of white flicker is achieved compared to an otherwise identical composition, but which does not include either (i) a compound of formula G or (ii) a compound of formula B and/or C.