A process for controlling the cone tilt angle of a tilted smectic liquid crystal composition comprises the step of combining (a) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound comprising (i) an aliphatic fluorocarbon terminal portion comprising a terminal fluoroalkyl or fluoroether group and an alkylene group having at least two carbon atoms and containing at least one catenary ether oxygen atom, (ii) an aliphatic hydrocarbon terminal portion, and (iii) a central core connecting the terminal portions; and (b) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound; with the provisos that at least one of the compositions (a) and (b) comprises at least one chiral liquid crystal compound and that the combining of compositions (a) and (b) provides an optically active, tilted chiral smectic liquid crystal composition. The process enables control of cone tilt angle and thereby control of the brightness characteristics of liquid crystal display devices.
一种用于控制倾斜相
液晶组合物锥倾角的方法包括以下步骤:将(a)至少一种包含至少一种含有至少一种
脂肪氟碳末端部分的倾斜相或潜在倾斜相
液晶化合物的
液晶组合物与(i)末端
氟烷基或
氟醚基团和至少含有两个
碳原子的烷基团并且含有至少一个链状醚
氧原子的烷基团,(ii)
脂肪烃末端部分和(iii)连接末端部分的中心核心;以及(b)至少一种包含至少一种倾斜相或潜在倾斜相
液晶化合物的
液晶组合物相结合的步骤;但要求至少其中一种组合物(a)和(b)包含至少一种手性
液晶化合物,并且组合物(a)和(b)的结合提供了一种光学活性的、倾斜的手性相
液晶组合物。该方法使得能够控制锥倾角,从而控制
液晶显示设备的亮度特性。