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

反射型液晶显示器(LCD)具有体积小、重量轻、功耗低等优点，而反射式彩色LCD由于滤色片吸收大，很难达到足够的亮度。本研究采用有源矩阵驱动的R-OCB模式，以实现高性能的反射式全彩色运动图像LCD。旨在为液晶面板、光学延迟膜和偏振器的光学设计和优化提供理论依据。为此，我们新提出了上述元素的光学性质的理论表达式。在这种方法中，我们成功地用简单的图解方法表达了每个元素的波长依赖关系和视角依赖关系，利用这个表达式，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式显示器的所有参数。因此，我们设计了一款高性能反射式LCD，在宽视角范围内具有高亮度、消色差以及在宽视角范围内具有很好的暗状态或很高的对比度。最后，基于上述设计条件，实际制作了高性能反射式全彩LCD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，这种LCD在宽视角(距法线方向0到50度)下具有与彩色照片一样高的亮度，并且比彩色照片具有更高的对比度。

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.