An object of the present invention is to provide a compound having an excellent rate of change in HTP caused by exposure. Another object of the present invention is to provide a liquid crystal composition formed of the compound, a cured product, an optically anisotropic body, and a reflective film.

The compound of the present invention is represented by General Formula (1).

##STR00001##

In General Formula (1), a portion where a solid line and a broken line are parallel to each other represents a single bond or a double bond.

In General Formula (1), X.sup.1 to X.sup.8 each independently represent a hydrogen atom or a monovalent substituent. However, at least one of X.sup.1, X.sup.3, X.sup.5, or X.sup.7 and at least one of X.sup.2, X.sup.4, X.sup.6, or X.sup.8 represent a substituent including a group represented by General Formula (2).

##STR00002##

In General Formula (2), Z represents a single bond or —O—. Y.sup.1 and Y.sup.2 each independently represent a hydrogen atom or a hydrocarbon group not including an aryl group. *1 and *2 represent bonding positions.

A liquid crystal composition includes at least one compound of general Formula I in an amount of 1%-30% by weight of the total weight of the liquid crystal composition, at least one compound of general Formula II in an amount of 5%-35% by weight of the total weight of the liquid crystal composition, and at least one compound of general Formula III in an amount of 10%-50% by weight of the total weight of the liquid crystal composition. The liquid crystal composition has an appropriate clearing point, an appropriate optical anisotropy, an appropriate dielectric anisotropy, as well as a higher voltage holding ratio, a higher transmittance, a good high-temperature resistant performance and a faster response speed, thus being suitable for display modes, such as VA, IPS and FFS. A photoelectric display device includes the liquid crystal composition.

##STR00001##

The present invention provides a liquid crystal composition comprising one or more compounds of general formula I and one or more compounds of general formula II; the liquid crystal composition of the present invention can work at very high and very low temperatures, has a very short response time and a better reliability to light and heat, and particularly exhibits no image retention or a significantly reduced image retention after a long time operation.

Provided are a liquid crystal composition satisfying at least one of characteristics such as high maximum temperature, low minimum temperature, low viscosity, suitable optical anisotropy and large negative dielectric anisotropy, or having 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 high maximum temperature or low viscosity as a second component, and may contain a specific compound having negative dielectric anisotropy as a third component, or a specific compound having a polymerizable group as an additive.

The present application relates to a device for regulating the passage of light which is characterised in that it comprises a layer comprising a liquid-crystalline mixture containing a characteristic structural element.

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##

A compound has an excellent rate of change in HTP caused by exposure. A liquid crystal composition is formed of the compound. A cured product, an optically anisotropic body, and a reflective film can be obtained by curing the liquid crystal composition. The compound is represented by General Formula (1): ##STR00001##

Provided are a reactive mesogen that may improve display quality of a liquid crystal display, and a liquid crystal composition including the same. The reactive mesogen is represented by the following Formula:

BZ.sub.1.sub.b1XZ.sub.2.sub.b2Pa where X, Z1, Z2, B, and Pa are specified in the disclosure, and each of b1 and b2 is independently an integer between 0 to 6, inclusive.

The invention relates to a liquid-crystalline medium comprising at least one compound of the formula I, ##STR00001##
in which R.sup.1 has the meanings indicated in Claim 1, and to the use thereof in liquid-crystalline media and in electro-optical liquid-crystal displays.

Disclosed are liquid crystal compounds of cycloalkyl-containing dibenzofuran derivatives, a preparation method therefor and use thereof. The compounds are as represented by formula I. In the molecular structures of the compounds of formula I provided by the present invention, liquid crystal compounds of cycloalkyl terminal group-containing dibenzofuran derivatives, compared with those having flexible alkyl chains as terminal groups, exhibit better intersolubility, and thus the use of a compound as represented by formula I provided by the present invention can improve the intersolubility of a liquid crystal compound and extend the application range of a liquid crystal mixture, producing an important application value. ##STR00001##