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    • 2. 发明授权
    • Reflective liquid crystal display of twisted nematic mode with high reflectance ratio
    • 具有高反射率的扭曲向列模式的反射液晶显示
    • US06654093B1
    • 2003-11-25
    • US09571276
    • 2000-05-16
    • Woohyun Kim
    • Woohyun Kim
    • G02F11335
    • G02F1/133553G02F1/13363G02F2202/40
    • A reflective liquid crystal display device includes: first and second substrates spaced apart and facing each other; a twisted nematic liquid crystal layer sandwiched between the two substrates, the liquid crystal layer having a twist angle and birefringence property &Dgr;n and having a thickness d; a retardation film disposed on the first substrate and opposite to the liquid crystal layer, the film converting a first linearly polarized light from above to a first circularly polarized light and converting a second circularly polarized light reflected from below to a second linearly polarized light; a linear polarizer disposed on the retardation film and opposite to the liquid crystal layer and converting the incident light to the first linearly polarized light; and a reflector disposed between the liquid crystal layer and the second substrate and reflecting light passed through the liquid crystal layer. A most desirable range for the twist angle is between above 65° and 75° or 75° and 85° and a most desirable range of a product d&Dgr;n is between about 0.20 &mgr;m and 0.28 &mgr;m or 0.18 &mgr;m and 0.26 &mgr;m. By the invention, light reflectance, contrast ratio and yield can be enhanced.
    • 反射型液晶显示装置包括:第一和第二基板间隔开并面对彼此; 夹在两个基板之间的扭曲向列型液晶层,液晶层具有扭曲角和双折射特性Deltan,并具有厚度d; 延迟膜,其设置在所述第一基板上并与所述液晶层相对,所述膜将来自上述的第一线偏振光转换为第一圆偏振光,并将从下方反射的第二圆偏振光转换为第二线偏振光; 设置在延迟膜上并与液晶层相反并将入射光转换成第一直线偏振光的线偏振片; 以及设置在液晶层和第二基板之间并反射通过液晶层的光的反射器。 扭转角最理想的范围是在65°和75°或75°和85°之间,产物dDeltan的最理想的范围是在大约0.20μm和0.28μm之间,或0.18μm和0.26μm。 通过本发明,可以提高光反射率,对比度和产率。