As dichromatic dyes to be used in a liquid crystal color display device, compounds represented by the following formula (1):
for example, 4'-octylphenyl perylene-3,9-dicarboxylate, are proposed. These compounds have the following characteristics: (1) they possess enough coloring power even in a small amount, (2) they have a large dichromatic ratio and show a large contrast between the state when voltage is applied thereto and the state when no voltage is applied thereto, (3) they have enough compatibility with a liquid crystal, and (4) they are excellent in durability, show good stability, and do not deteriorate display performance even when used for a long time.
作为液晶彩色显示装置中使用的双色
染料,建议使用下式(1)表示的化合物:例如 4'-辛基苯基过烯-3,9-二
甲酸酯。 这些化合物具有以下特点:(1)即使用量很少,也具有足够的着色力;(2)双色比率大,加电压时的状态与不加电压时的状态反差大;(3)与液晶有足够的相容性;(4)耐久性极佳,稳定性好,即使长期使用也不会降低显示性能。