Seiko Epson Corporation

Takashi Tanaka

Hiroshi Iwane

Yuzuru Sato

Shiro Inui

A liquid crystal composition which shows an antiferroelectric smectic phase in a wide temperature range including room temperatures, and allows high speed operation at a low voltage. A liquid crystal composition comprising at least one kind of compound expressed as ##STR1## shows an antiferroelectric smectic liquid crystalline phase at room temperatures. In the above-mentioned formula, both R.sub.1 and R.sub.2 are alkyl groups, X.sub.1 is a bonding group, X.sub.2 and X.sub.3 are independently selected bonding groups, k, m and n are independently selected from 0 or the integer 1, Z is CF.sub.3 or CH.sub.3, A.sub.1 and A.sub.2 are groups independently selected from a six-membered ring optionally replaced with 0 to 2 nitrogen atoms, or a group in which 2 to 3 such six-membered rings of the same kind or different kinds are linked at the para positions directly or via one or more bonding groups, wherein one or more hydrogen atoms in one or more such rings is optionally replaced with either fluorine atom, methyl group or ethyl group.

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Suwa, Japan

Takashi Tanaka