DEVELOPMENT OF SUPER LOW CONSUMPTION REFLECTIVE FULL COLOR LIQUID CRYSTAL DISPLAY FOR MOVING IMAGE

反射型液晶显示器（LCD）具有形状薄、重量轻、功耗低的优点，而反射型彩色液晶显示器由于滤色片的大量吸收，被认为很难达到足够的亮度。然后，我们通过极大地增加液晶的视角，并将反射光收集到一定的角度范围内，已经解决了这个问题。在本研究中，为了实现具有全彩色运动图像的高性能反射LCD，采用了有源矩阵驱动的R-OCB模式。本文旨在建立液晶面板、光学延迟膜和偏振片的光学设计和优化理论。为此，我们提出了以上述元素的光学性质为中心的理论表达式。在此方法中，我们成功地用简单的图解法表达了各元件的波长依赖性和视角依赖性。利用该表达式，几乎可以从理论上处理显示器的所有光学特性，并可以优化和确定设计反射显示器的所有参数。因此，我们设计了一种具有高亮度，宽视角范围无色差，宽视角范围非常好的暗态或对比度非常高的高性能反射LCD。最后，基于上述设计条件，实际制作了高性能反射全彩液晶显示器作为试验。这款LCD被证实具有极高的对比度，在宽视角范围内几乎没有色移。此外，该液晶显示器具有与彩色照片一样高的亮度在宽视角（0至50度从正常方向）和更高的对比度的彩色照片。

Reflective type liquid crystal displays (LCDs) have advantages of thin shape, light weight and low power consumption, while it was considered to be quite difficult to achieve sufficient brightness in reflective color LCD because of large absorption of the color filter. Then, we have already solved this problem by increasing the viewing angle of liquid crystal extremely and by collecting the reflected light into a certain angle range.In this research, in order to realize a high performance reflective LCD with full color moving image, R-OCB mode with active-matrix-drive is adopted. We aimed to establish a theory of the optical designing and optimization of the liquid crystal panel, optical retardation films and polarizers. For this purpose, we newly proposed theoretical expression focusing on optical properties of the above mentioned elements. In this method we have succeeded to express the wavelength dependence and viewing angle dependence of each element by simple diagrammatic method.By using this expression, almost all the optical characteristics of display can be treated theoretically and all the parameters to design the reflective display can be optimized and determined. As the result, we have designed an extremely high performance reflective LCD with high brightness, achromatic while in wide viewing angle range and very good dark state or very high contrast ratio in wide viewing angle range.Finally, based on the above mentioned design condition, a high performance reflective full color LCD is actually fabricated as a trial. This LCD was confirmed to have extremely high contrast and almost no color shift in wide viewing angle range. In addition, this LCD has as high brightness as a color photograph in wide viewing angle (0 to 50 degrees from normal direction) and higher contrast the color photograph.