申请人:Chisso Corporation
公开号:EP0345357A1
公开(公告)日:1989-12-13
A liquid crystal compostion for use in a thermal writing liquid crystal display utilizing a thermo-optical effect, and a liquid crystal display element using same are disclosed. The liquid crystal composition has an extremely narrow nematic range and a phase transition of a low melting point, and is used for a liquid crystal display element The liquid crystal composition contains at least two components, i.e., component A comprising at least one 4-n-alkyl-4'-cyanobiphenyl represented by general formula (I) wherein R' represents an alkyl group having 8, 9. 10.11.12 carbon atoms) and component B comprising at least one 4-n-alkoxycarbonyloxy-4'-cyanobiphenyl represented by general formula (II) wherein R2 represents an alkyl group having 8. 9. 10. 11 or 12 carbon atoms), in a ratio of component A to component B of 25:75 to 95:5. Since the composition may have a nematic range of 2°C or below, it enables rapid writing on a display element and improves the contrast of a projected image. thus markedly improving display quality Additionally, it is advantageously used for a thermal writing liquid crystal display to be used at room temperature since it has a melting point of 0 C or below
本发明公开了一种用于利用热光学效应的热写入液晶显示器的液晶组合物,以及使用该液晶组合物的液晶显示元件。该液晶组合物具有极窄的向列范围和低熔点相变,可用于液晶显示元件。该液晶组合物至少包含两种成分,即包含至少一个由通式(I)代表的 4-正烷基-4'-氰基联苯(其中 R'代表具有 8、9、10.11.12 个碳原子的烷基)的成分 A 和包含至少一个由通式(I)代表的 4-正烷基-4'-氰基联苯(其中 R'代表具有 8、9、10.11.12 个碳原子的烷基)的成分 B。10.11.12 个碳原子的烷基)和由至少一种 4-正烷氧基羰基氧基-4'-氰基联苯组成的组分 B(由通式(II)代表,其中 R2 代表具有 8、9.10.11或12个碳原子的烷基),组分A与组分B的比例为25:75至95:5。此外,由于该组合物的熔点为 0℃或以下,因此可在室温下用于热写液晶显示器。