在本論文中提出一全方向視角可切換的液晶顯示器，實驗中利用三電極之結構控制視角的切換，並藉由結構中之雙軸之條狀電極設計產生兩個維度之邊緣電場，使暗畫面產生全視角漏光，也由於全視角之漏光，所以其於窄視角模式時有更好的隱私保護的效果。實驗結果顯示當兩方向之條狀電極面積比例為1:1時水平與垂直方向之視角均可控制在40o的範圍內。此外當液晶層厚度增加時其正向對比值也會增加。另外當正交偏光板與液晶之夾角為0o時有最佳之對比與視角切換效果。

In this study, a liquid crystal display (LCD) is proposed to have a capability of viewing-angle-switching in all directions. In the proposed LCD, a three-electrode structure is used to control the viewing angle of the LCD. By using a bi-direction slit type electrode, fringe fields with two different directions are generated. The fringe fields cause a light leakage of the dark state in all directions. Experimental results reveal that the proposed LCD has viewing angle within 40o in both vertical and horizontal directions when the area ratio of the vertical and horizontal slit is 1:1. Furthermore, contrast ratio (CR) of the proposed LCD increases as cell gap increases. When the angle between polarizer axis and LC is 0, the proposed LCD has the highest CR in the normal direction. The personal privacy is protected based on the proposed LCD due to the all-direction light leakage in the dark state.

目錄
中文摘要............................................................i
Abstract.............................................................ii
致謝...............................................................iii
目錄...............................................................iv
圖表索引...........................................................vi
第一章 導論.........................................................1
1.1 前言.......................................................1
1.2 液晶的歷史.................................................2
1.3 何謂液晶...................................................3
1.4 液晶分類...................................................4
1.5 液晶物理性質...............................................8
1.5.1 光學異向性.............................................8
1.5.2液晶介電異向性.........................................13
1.5.3彈性常數...............................................14
1.5.4黏滯係數...............................................15
1.5.5液晶分子排列的秩序參數.................................16
1.5.6 溫度對液晶分子的影響...................................17
第二章 顯示器技術與理論............................................18
2.1 顯示器裝置介紹............................................18
2.2 液晶的配向技術............................................19
2.3 顯示器座標和對比..........................................21
2.4 水平配向液晶穿透率公式....................................23
2.5 液晶漏光現象.............................................25
2.6 廣視角技術...............................................26
2.7 模擬軟體 TECHWIZ 介紹...................................27
第三章 樣品........................................................30
3.1 材料簡介..................................................30
3.2 樣品製作..................................................31
3.3 實驗裝置與量測............................................35
第四章 模擬與實驗結果討論..........................................37
4.1 窄視角的設計與原理........................................37
4.2 廣窄視角的設計與操作模式..................................40
4.3 各項模擬參數的設計與比較..................................42
4.4 實測的數據與模擬比較......................................51
第五章 結論.......................................................54
文獻參考..........................................................55

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