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研究生： 陳俊昌
Chen, Jun-Chang
論文名稱： 反射式超扭轉向列型液晶顯示器的補償特性探討
Studies on the Compensated Characteristics of Reflective Super Twisted Nematic Liquid Crystal Displays(RSTN-LCDs)
指導教授： 陳鐵城
Chen, Tei-Chen
學位類別： 碩士
Master
系所名稱： 工學院 - 機械工程學系
Department of Mechanical Engineering
論文出版年： 2003
畢業學年度： 91
語文別： 中文
論文頁數： 75
中文關鍵詞： 補償膜
外文關鍵詞： compensation film
相關次數： 點閱：64  下載：2 
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    • 反射式液晶顯示器以環境光源提供所需亮度，不需要背光源，所以耗電量和整體重量皆大大的減少，特別適於可攜式電子產品如PDA(personal digital assistant)、手機和數位相機等。且以單偏光結構的反射式液晶顯示器，因為具有較高亮度以及高對比，已漸漸的成為發展主流。
    然而反射式超扭轉向列型液晶顯示器(RSTN-LCD)最近幾年已經廣泛的被研究，由於還有許多改善空間，例如亮度(brightness)、對比(contrast)、視角(viewing angle)與灰階穩定度(gray levels stability)等。其中因為暗態漏光的產生，使的液晶顯示器的視角窄小與對比降低，而導致液晶顯示器的顯示特性受影響。在本論文中，將結合a-plate, c-plate和o-plate來改善大視角時所產生的漏光，並選擇適合的補償膜參數來達到更優異的顯示特性。而液晶顯示器的模擬上，首先利用一維Euler-Lagrange方程式來求解液晶導軸 和 在液晶層中任意厚度時的分佈情形。然後將液晶層分成足夠的數目已致於能將每一層視為導軸方向一定的單軸晶體，再經由extended Jones matrix來計算反射式超扭轉液晶顯示器加上負單軸補償膜的光電特性。

    Reflective LCDs do not require a backlight so that their power consumption and panel weight are both reduced. It is key device for portable information products such as PDA, cell phone and digital camera. The single-polarizer reflective LCD offers a compromise between display brightness and contrast ratio, and has gradually become the mainstream approach.
    However, reflective LCDs have been studied intensively in recent years. There is still much room for improvement such as brightness, contrast, viewing angle and gray levels stability. The primary factor limiting the contrast ratio and narrow viewing angle achievable in a LCD are the amount of light that leaks through the display in the dark state. In this thesis, a compensator which is the combination of negative a-plate, c-plate and o-plate will be utilized to minimize the oblique leakage light in the wide viewing angle and select some parameter values for RSTN-LCDs to achieve higher viewing characteristics. We followed the standard procedure for LCD simulation. First, the one dimensional Euler-Lagrange equations for the director deformation were solved to give the director angles and for all values of z inside the LC cell for any value of applied voltage. Then reflectance was calculated by the extended Jones matrix approach of dividing the cell which includes liquid crystal layer and compensation films into many layers and treating each layer as a birefringent plate.

    中文摘要.........................................Ⅰ 英文摘要.........................................Ⅱ 誌謝.............................................Ⅲ 目錄.............................................Ⅴ 表目錄...........................................Ⅷ 圖目錄...........................................Ⅸ 符號說明.......................................ⅩⅢ 第一章 緒論.......................................1 1.1 前言..........................................1 1.2 產業現況......................................2 1.3 研究動機......................................4 1.4 文獻回顧......................................5 1.4.1 2×2 Matrix Method...........................6 1.4.2 參數空間及液晶顯示器模擬....................6 1.4.3 LCD的補償及改善.............................7 1.5 本文架構......................................9 第二章 液晶材料與液晶光學性質....................10 2.1 液晶材料概述.................................10 2.2 液晶物理與光電特性...........................13 2.2.1 向列型液晶的特性...........................13 2.2.2 向列型液晶的複折射現象及光學特性...........14 2.3 液晶在顯示器上的應用.........................18 2.3.1 穿透式液晶顯示器...........................18 2.3.2 反射式液晶顯示器...........................20 第三章 基本理論分析..............................22 3.1 液晶導軸分佈.................................22 3.1.1 液晶的連續體彈性形變理論...................22 3.1.2 液晶導軸分佈計算...........................23 3.2 Extended Jones Matrix Method.................27 3.2.1 單軸介質介面的折射與反射...................27 3.2.2 2×2矩陣表示式..............................29 3.2.3 任意光軸方向...............................31 3.2.4 應用於液晶顯示器...........................32 3.2.5 反射式顯示器的分析.........................34 3.3 參數空間.....................................37 第四章 模擬分析與結果討論........................39 4.1 基本假設與模擬分析...........................39 4.2 模擬模型與材料參數...........................40 4.3 補償模參數與說明.............................42 4.4 模擬結果與討論...............................45 第五章 結論與建議................................69 5.1 結論與建議...................................69 5.2 未來展望.....................................71 參考文獻.........................................72 附錄.............................................75

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