Dichroic coloring agents which have a blue to blue-violet hue and have not been used to date for liquid crystal displays are disclosed. These coloring agents are represented by the following formula:
wherein X is S or NH; R₁ is a hydrogen atom, halogen atom, alkyl group or alkoxy group; and R₂ is a hydrogen atom, alkyl group, aryl group or aralkyl group.
本发明公开了具有蓝色至蓝紫色调的二色性
着色剂,这种
着色剂至今尚未用于液晶显示器。这些
着色剂由下式表示:
其中 X 是 S 或 NH;R₁ 是氢原子、卤素原子、烷基或烷氧基;R₂ 是氢原子、烷基、芳基或芳烷基。