Liquid crystal composition, liquid crystal device, display apparatus and display method
申请人:CANON KABUSHIKI KAISHA
公开号:EP0500072A1
公开(公告)日:1992-08-26
A liquid crystal composition, comprising: at least one mesomorphic compound represented by the following formula (I):
wherein R¹ and R² independently denote a linear or branched alkyl group having 1 - 18 carbon atoms capable of including one or non-neighboring two or more methylene groups which can be replaced with at least one species of -O-, -CO-, -COO-, -OCO-, -OCOO-or -CH(X)- with the proviso that -O- cannot directly be connected to -O- and X denotes halogen; Z¹ denotes -COO- or -CH₂O-; X¹ and X² independently denote a single bond, -O-, -COO-, -OCO-, -CO- or -OCOO-; A¹ denotes a single bond,
Y¹ and Y² independently denote hydrogen, halogen, -CH₃- or CF₃-; and at least one mesomorphic compound represented by the following formula (II):
wherein R³ and R⁴ independently denote a linear or branched alkyl group having 1 - 18 carbon atoms capable of including one or non-neighboring two or more methylene groups which can be replaced with at least one species of -O-, -CO-, -COO-, -OCO-, -OCOO-or -CH(X)- with the proviso that -O- cannot directly be connected to -O- and X denotes halogen; X³ and X⁴ independently denotes a single bond, -O-, -COO-, -OCO-or -CO-; Z² denotes a single bond, -COO- or -OCO-; A², A³ and A⁴ independently denote a single bond,
Y³ and Y⁴ independently denote hydrogen, halogen, -CH₃ or -CF₃; and k is 0 or 1 with the proviso that X³ is a single bond when A² is a single bond, and X⁴ is a single bond when A³ is a single bond and k is 0. The liquid crystal composition is easily aligned by a simple rubbing method to provide a uniform monodomain and further provides wider driving voltage and temperature margins effective for providing a practical ferroelectric liquid crystal device.
一种液晶组合物,包括: 至少一种由下式 (I) 代表的介晶化合物:
其中 R¹ 和 R² 独立地表示具有 1 - 18 个碳原子的直链或支链烷基,可包括一个或非相邻的两个或多个亚甲基,这些亚甲基可被-O-、-CO-、-COO-、-OCO-、-OCOO-或-CH(X)-中的至少一种取代,但-O-不能直接与-O-相连,X 表示卤素;Z¹ 表示-COO-或-CH₂O-;X¹ 和 X² 独立地表示单键、-O-、-COO-、-OCO-、-CO-或-OCOO-;A¹ 表示单键、
Y¹ 和 Y² 独立地表示氢、卤素、-CH₃- 或 CF₃-;以及至少一种由下式 (II) 代表的介形化合物:
其中 R³ 和 R⁴ 独立地表示具有 1-18 个碳原子的直链或支链烷基,可包括一个或非相邻的两个或多个亚甲基,这些亚甲基可被 -O-、-CO-、-COO-、-OCO-、-OCOO- 或 -CH(X)- 中的至少一种取代,但 -O- 不能直接与 -O- 连接,X 表示卤素;X³ 和 X⁴ 分别表示单键、-O-、-COO-、-OCO-或-CO-;Z² 表示单键、-COO-或-OCO-;A²、A³ 和 A⁴ 分别表示单键、
液晶组合物很容易通过简单的摩擦方法对齐,以提供均匀的单域,并进一步提供更宽的驱动电压和温度余量,从而有效地提供实用的铁电液晶器件。