Liquid crystal composition and liquid crystal display device
AssigneeMinolta Co., Ltd.
InventorsMasako Iwamatsu, Nobuyuki Kobayashi, Hideaki Ueda
Life of this patent
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Abstract
A liquid crystal composition which contains a liquid crystal tolan compound, a liquid crystal ester compound, a liquid crystal phenylcyclohexane compound and at least one chiral agent. A reflective type liquid crystal display has the liquid crystal composition and a columnar structure between substrates with ITO electrodes thereon.
Claims18
A liquid crystal composition exhibiting, as a whole, a cholesteric phase having bistability in an absence of an electric field and being capable of transforming, in response to an application of an electric field, between stable states, said stable states including a planar state and a focal-conic state, said liquid crystal composition comprising:
- a nematic liquid crystal composition comprising:
- a liquid crystal tolan compound including a tolan unit therein;
- a liquid crystal ester compound including an ester unit therein;
- and
- a liquid crystal phenylcyclohexane compound including a phenylcyclohexane unit therein;
- and
- at least one chiral agent which has optical activity;
- wherein said liquid crystal tolan compound, said liquid crystal ester compound, said liquid crystal phenylcyclohexane compound and said at least one chiral agent have mutually different chemical structures.
A liquid crystal display device comprising:
- a pair of substrates, at least one of which is transparent;
- a liquid crystal composition provided between the substrates, the liquid crystal composition exhibiting a cholesteric phase as a whole, comprising:
- a nematic liquid crystal composition comprising:
- a liquid crystal tolan compound including a tolan unit therein;
- a liquid crystal ester compound including an ester unit therein;
- and
- a liquid crystal phenylcyclohexane compound including a phenylcyclohexane unit therein;
- at least one chiral agent which has optical activity;
- and
- a driver for applying an electric field to the liquid crystal composition,
- wherein said liquid crystal tolan compound, said liquid crystal ester compound, said liquid crystal phenylcyclohexane compound and said chiral agent have mutually different chemical structures;
- and
- wherein the liquid crystal composition is bistable in an absence of an applied electrical field and is capable of transforming, in response to an application of an electric field, between stables states, said stable states including a planar state and a focal-conic state.
Dependencies are inferred from the claim text.