利用邊緣電場效應之單間隙半穿透反射液晶顯示器模擬分析

Abstract

本研究探討單間隙半穿透半反射液晶顯示器利用邊緣電場效應（Fringe-Field）改善穿透式液晶顯示器與反射式液晶顯示器不良的光電特性。以邊緣電場效應（Fringe-Field）為電場分佈基礎，產生FFS液晶模態，使此研究液晶顯示器具備基本的廣視角以及傑出光效率，再進一步研究與改善間隙半穿透半反射液晶顯示器的結構，使電場分佈改變，以求有所改善不一致的E－O曲線特性；本研究有四種改善方式︰ 1) 改變液晶參數方法克服不一致E-O curve、 2) Top-Bottom TFT electrode LCD（I）、 3) Top-Bottom TFT electrode LCD（II）、 4) Patterned Common electrode LCD design。 由上述四種改善方式進行研究分析當液晶層厚度、電極結構以及使用液晶參數特性改變，對於單間隙液晶顯示器光電特性的影響，觀察影響分佈，既而提供適當改良參考方向。

This thesis studies the methods, which make transflective LCDs electro-optical characters match equally. This thesis uses four topics to deal with the different electro-optical curve. The following is the topics：（1）The method of changing liquid crystal parameters、（2）Top-Bottom TFT electrode LCD（I）、（3）Top-Bottom TFT electrode LCD（II）、and （4）Patterned Common(P.C.) electrode TR LCD design. Those studies base on FFS mode（Fringe-Field Switching） which has high light efficiency、fast response time、and wide viewing angle property. To go a step further, the four topics match transmissive LCDs and reflective LCDs E-O curve. In （1）The method of changing liquid crystal parameters, different pretilt angle is the major method for matching threshold voltage（Vth）which could get more matched E-O curve of T & R part. In （2）Top-Bottom TFT electrode LCD（I）、（3）Top-Bottom TFT electrode LCD（II） and （4）Patterned Common(P.C.) electrode TR LCD design, the three topics take new structure design to get the same transflective LCDs E-O curve. This study is helpful for improving electro-optical characters of transflective LCDs and may be useful to the applications of small size flat-planel display.