反射式混合排列型液晶顯示器之製作與特性探討

Abstract

本文提出一種新型的反射式液晶顯示器，其架構主要是由一偏極片、一相 位補償片、以及一個內鍍有金屬電極的混合排列型液晶盒所組成。它擁有 耗電量低、廣視角、能顯示全彩化畫面…等優越特性，對於個人可攜式資 訊系統而言，是個極有潛力的人機界面。在理論方面，我們由液晶自由能 出發，藉電腦計算出液晶分子指向矢的分佈，模擬此顯示器的相位延遲與 光電特性，並由模擬結果計算求得相位補償膜的材料參數與製作規格，以 製作所需的相位補償膜。在實驗方面，從液晶樣品製作開始，建立量測系 統，觀察反射式混合排列型液晶顯示器的相位延遲與光電特性，並與理論 計算模擬結果比較，了解此機制的顯示特性。實驗結果顯示，在紅光時的 對比度較綠光時為小，這是因為暗狀態的反射率太大所致，因此，我們探 討材料的色散現象對反射式混合排列型液晶顯示器的影響，並提出適當的 操作規格，加上適當的材料選擇，解決不同波長時的漏光現象，於最後對 各部份的結果做個綜合性的結論，並提出對未來的展望。 A new reflective type LCD, comprising one polarizer, one re- tardation film, and one HAN（Hybrid-Aligned-Nematic）cell with a metal electrode inside, is studied in this thesis. The excellent properties of low power consumption, wide viewing angle, and full-color capability, promise its potential application in the portable personal information tools. In theory, we calculated the director distribution of HAN liquid crystal and the optical performance of the device with phase compensated film by using Euler-Lagrange equation and Extend 2x2 Jones Matrix method, respectively. According to the simulated result, we can find the material parameters of the compensator and make it. In experiment, we set up the measuring system to observe the performance of the whole device and compare the experimental results with the simulated ones. This will help us to realize the characteristics of HAN type LCD. According to the experiment, we find the contrast ratio under red light is smaller than the one under the green light. There- fore, we will discuss the influence of HAN type LCD by material dispersion and provide the suitable operation mode to solve the problem of light leakage under the different wavelength. We take an integrated conclusion in the end of the thesis.