Mesomorphic compound, liquid crystal composition, liquid crystal device, display apparatus and display method

A display method, comprising:

• providing a liquid crystal composition comprising at least two mesomorphic compound, at least one of which is a mesomorphic compound of the following formula (I):
• ##STR218## wherein R.sub.1 and R.sub.2 independently denote a linear or branched alkyl group having 1-18 carbon atoms capable of including one or two or more non-neighboring methylene groups which can be replaced with ##STR219## wherein X denotes halogen;
• X.sub.1 and X.sub.2 independently denote a single bond, ##STR220## Z.sub.1 denotes ##STR221## A.sub.1 denotes a single bond, ##STR222## and Y.sub.1 and Y.sub.2 independently denote H, F, Cl, Br, --CH.sub.3 or --CF.sub.3 with the proviso that at least one of Y.sub.1 and Y.sub.2 is F;
• and
• switching the alignment direction of liquid crystal molecules by applying voltages to the liquid crystal composition to effect display.

A display method, comprising:

• providing a liquid crystal device comprising a pair of electrode plates and a liquid crystal composition disposed therebetween comprising at least two mesomorphic compound, at least one of which is a mesomorphic compound of the following formula (I):
• ##STR229## wherein R.sub.1 and R.sub.2 independently denote a linear or branched alkyl group having 1-18 carbon atoms capable of including one or two or more non-neighboring methylene groups which can be replaced with ##STR230## wherein X denotes halogen;
• X.sub.1 and X.sub.2 independently denote a single bond ##STR231## Z.sub.1 denotes ##STR232## A.sub.1 denotes a single bond, ##STR233## and Y.sub.1 and Y.sub.2 independently denote H, F, Cl, Br, --CH.sub.3 or --CF.sub.3 with the proviso that at least one of Y.sub.1 and Y.sub.2 is F;
• and
• switching the alignment direction of liquid crystal molecules by applying voltages to the liquid crystal composition between the electrode plates to effect display.