基于三维光学模型的彩色边缘场效应优化

Optimization of Color Fringing Field Effect Based on Three-Dimensional Optical Model

研究了垂直向列型彩色滤光膜硅覆液晶(VA CF-LCoS)微显示器件,并利用其三维光学模型,改变液晶器件的预倾角、像素尺寸等参数,优化了微小像素中的边缘电场效应。为进一步优化器件的性能,建立了以圆偏振光作为入射光源的微显示器件的三维光学模型。研究结果表明:当以圆偏振光作为照明光源时,VA CF-LCoS微显示器件的光学反射效率可得到大幅提升。由于采用了三维光学模型的分析方法,得到了与利用二维光学模型进行分析时完全不同的结论:优化只能使得边缘场效应导致的亮态子像素内部黑线减小,而不能彻底消除它。

Herein, the vertical aligned nematic color filter liquid crystal on silicon (VA CF-LCoS) microdisplay was studied, and the fringing field effect in micro-pixels was optimized by changing the pre-tilt angle and pixel size. To further optimize device performance, a three-dimensional (3D) optical model of the V A CF-LCoS was established using circularly polarized light as the incident light source. Results reveal that the optical reflection efficiency of V A CF-LCoS can be considerably improved when a circularly polarized light is used as the illumination source. Herein, using 3D optical analysis, a completely different conclusion has been reported compared to those reported by former researchers who use two-dimensional optical analysis : the black lines in bright sub-pixels caused by the fringing field effect can only be reduced via optimization, and not completely eliminated.