Disclosed is to provide an azine derivative as a novel liquid crystal compound, a novel process for the preparation of an asymmetrical azine in a high reaction yield with an extremely small amount of by-products such as symmetrical azines, a nematic liquid crystal composition containing the azine derivative which exhibits a broad driving temperature range and an excellent response for the desired high birefringence index, a liquid crystal display device such as TN-LCD, STN-LCD and TFT-LCD having improved electro-optical properties comprising the liquid crystal composition as a constituent material, and a light-scattering type liquid crystal display system which exhibits a suppressed memory phenomenon, a higher uniformity in turbidity for display and improved display properties and response against temperature change while maintaining and improving the required display properties such as fast switching time, lower voltage driving, higher light-control layer resistivity and higher contrast ratio even in the foregoing light-scattering type liquid crystal display system.
本发明公开了提供一种偶氮衍
生物作为新型液晶化合物的方法,一种高反应产率的不对称偶氮衍
生物的制备方法,该方法仅生成极少量的对称偶氮衍
生物等副产物,一种含有该偶氮衍
生物的向列型液晶组合物,该组合物具有广泛的驱动温度范围和卓越的响应性,以获得所需的高双折射率指数,一种液晶显示装置,例如TN-LCD,STN-LCD和TFT-LCD,包括该液晶组合物作为组成材料,具有改善的电光性能,以及一种光散射型液晶显示系统,该系统表现出抑制记忆现象,显示均匀性更高,显示性能和对温度变化的响应性更好,同时保持和改善所需的显示性能,例如快速切换时间,低电压驱动,更高的光控层电阻率和更高的对比度,即使在上述光散射型液晶显示系统中。