A polymerizable LC material comprising one or more reactive mesogenic compounds, one or more chiral compounds and a block copolymer that comprises at least one polyfluorooxetane block bonded to a polyether block, said polyfluorooxetane block having a repeating unit of the formula ##STR00001## Further, a method for its preparation, a polymer film obtainable from a corresponding polymerizable LC material, a method of preparation of such polymer film, and the use of such polymer film and said polymerizable LC material in optical, electro-optical, decorative or security devices.

There is provided a liquid crystal composition which enables a significant reduction in crystallization temperature as compared with addition of a homolog while having a similar skeleton structure, which has an excellent compatibility, and which enables an increase in the absolute value of negative dielectric anisotropy (Δ∈). The liquid crystal composition contains two or more compounds which each have two to four ring structures between two side chains. At least one of the ring structures is a 2,3-difluorobenzene skeleton. The two side chains are bonded to different ring structures. The positions of the 2,3-difluorobenzene skeletons are different from each other, and the number of the ring structures are the same as each other.

There is provided a liquid crystal composition containing any one or two or more of compounds represented by general formula (i) below and any one or two or more of compounds represented by general formula (ii) below. ##STR00001##

Provided is a liquid crystal compound that can obtain a high-speed response and a sufficient contrast ratio in switching of a display device. A compound represented by formula (1) described below is utilized.

##STR00001##

In formula (1), ring A is naphthylene, phenantolylene or anthracenylene, and in the groups, at least one piece of hydrogen may be replaced by halogen, —CH.sub.3, —C.sub.2H.sub.5, —CF.sub.3, —CHF.sub.2, —CH.sub.2F, —OCF.sub.3, —OCHF.sub.2 or —OCH.sub.2F; and X.sup.1, X.sup.2, X.sup.3, X.sup.4, X.sup.5, Y.sup.1, Y.sup.2, Y.sup.3, Y.sup.4 and Y.sup.5 are independently hydrogen or fluorine, but at least two or more of X.sup.1, X.sup.2, X.sup.3, X.sup.4, X.sup.5, Y.sup.1, Y.sup.2, Y.sup.3, Y.sup.4 and Y.sup.5 is fluorine.

A polymerizable LC material comprising one or more reactive mesogenic compounds, one or more chiral compounds and a block copolymer that comprises at least one polyfluorooxetane block bonded to a polyether block, said polyfluorooxetane block having a repeating unit of the formula

##STR00001##

Further, a method for its preparation, a polymer film obtainable from a corresponding polymerizable LC material, a method of preparation of such polymer film, and the use of such polymer film and said polymerizable LC material in optical, electro-optical, decorative or security devices.

A display panel includes a first substrate, an electrode layer, and a display medium layer. The electrode layer is disposed on the first substrate. The display medium layer is disposed on the electrode layer and includes a filler and liquid crystal capsules. The liquid crystal capsules are distributed in the filler, and the filler has a birefringence difference Δn in a range from 0.02 to 0.175.

The invention relates to a liquid-crystalline medium, in particular based on a mixture of polar compounds, and to the use thereof for an active-matrix display, in particular based on the VA, SA-VA, IPS, PS-IPS, FFS, PS-FFS, UB-FFS or PS-UB-FFS effect.

The present invention relates to a liquid-crystalline medium (LC medium), to the use thereof for electro-optical purposes, and to LC displays containing this medium.

A display panel includes a first substrate, an electrode layer, and a display medium layer. The electrode layer is disposed on the first substrate. The display medium layer is disposed on the electrode layer and includes a filler and liquid crystal capsules. The liquid crystal capsules are distributed in the filler, and the filler has a birefringence difference Δn in a range from 0.02 to 0.175.

A display panel includes a first substrate, an electrode layer, and a display medium layer. The electrode layer is disposed on the first substrate. The display medium layer is disposed on the electrode layer and includes a filler and liquid crystal capsules. The liquid crystal capsules are distributed in the filler, and the filler has a birefringence difference Δn in a range from 0.02 to 0.175.