扭轉向列型液晶顯示器的廣視角補償膜參數設計模擬與光學特性分析

Analysis of optical properties and design parameters of wide viewing angle compensation films for TN mode LCD

邱旭平(Hsu-Ping Chiu)

指導教授 ： 黃振球

元智大學/工程學院/化學工程與材料科學學系/碩士(2006年)

https://doi.org/10.6838/YZU.2006.00122

摘要

本研究是利用日本Shintech公司的光學設計模擬軟體針對normally white TN mode液晶顯示器的參數設計以及光學特性的模擬分析，包括液晶材料元件、液晶層厚度、預傾角度數與摩擦配向角度等等參數的改變，透過光學計算分析，將得到的結果，如液晶分子的軸向分布和等電位分布以及液晶顯示器的光學特性等，再進一步討論找出最佳化參數，根據模擬結果，得知在相位差380nm~420nm之間、預傾角約在4°~6°時，可以改善顯示器的色偏現象。接著再搭配四種不同的單軸性相位差膜，在光學補償作用下，降低液晶層在傾斜方向漏光的問題，在水平視角與垂直視角±70°時，對比仍然達20：1以上，有效將視角範圍˚提高到160˚以上，達到提高對比度及超廣視角的光學特性，使TN mode 液晶顯示器有更佳的顯示品質要求，進而在實際應用上有所幫助。

關鍵字

光學特性 ； 補償膜 ； 相位差板

並列摘要

In this study, the optical properties of the normally white TN mode liquid crystal display were analyzed by using LCD Master software from Shintech,Inc in Japanese. The principal parameters, including materials of liquid crystal, the thickness of cell gap, pretilt angle and rubbing angle were used to simulate with optical analyzer. The results of director alignment distribution and equal potential distribution were discussed in the liquid crystal cell. We also tried to find the best parameters. According to these results, we can improve the color shift for LCD between 380nm and 420nm of phase retardation, 4°and 6 of pretilt angle. Then, we reduced light leak of liquid crystal layer in inclined direction by using four different biaxial retardation films. The contrast ratio was above 20：1 in horizontal and vertical viewing angle ±70°,and improved the viewing angle range over 160˚for. We expect to obtain a TN mode liquid crystal display with high quality and wide viewing angle characteristics by using the simulated result.

並列關鍵字

optical property ； compensation film ； retardation film

參考文獻

activity of a twisted nematic liquid crystal”,Appl.

film based on negative birefringence of discotic

Development, p.51-55（2001）

10. 劉晏綺，”平面快速切換模式之二維梳狀電極結構的參數設計

liquid crystals using the in-plane switching mode",