Liquid crystalline compounds are disclosed which compounds are expressed by general formula (1)
wherein R1 represents an alkyl group having 1 to 10 carbon atoms, ring A represents 1,4-phenylene or 1,4-cyclohexylene, each of X1, X2, X3, and X4 independently represents hydrogen atom or fluorine atom, Y1 represents CF3 or OCF3, and each of m, n, and p is independently an integer of 1 or 0.
The liquid crystalline compounds have a wide temperature range of nematic phase, low viscosity, large positive Δε, high chemical stability, high miscibility with other liquid crystalline compounds at low temperatures, small temperature dependency of viscosity and Δε, extremely high specific resistance (high voltage holding ratio), and good UV stability, and are preferably used for TFT. Also, disclosed are liquid crystal compositions containing the liquid crystalline compounds mentioned above, and liquid crystal display devices using the liquid crystal composition.
本发明公开了液晶化合物,该化合物由通式(1)表示
其中 R1 代表具有 1 至 10 个碳原子的烷基,环 A 代表 1,4-亚苯基或 1,4-
环己烯,X1、X2、X3 和 X4 各自独立地代表氢原子或
氟原子,Y1 代表
CF3 或 O ,m、n 和 p 各自独立地为 1 或 0 的整数。
这些液晶化合物具有向列相的温度范围宽、粘度低、正Δε大、
化学稳定性高、在低温下与其他液晶化合物的混溶性高、粘度和Δε的温度依赖性小、极高的比电阻(高电压保持比)和良好的紫外线稳定性,最好用于 TFT。此外,还公开了含有上述液晶化合物的液晶组合物,以及使用该液晶组合物的液晶显示设备。