臺灣博碩士論文加值系統

液晶顯示器由於具有重量輕、體積小、低耗能等優點，在近幾年來發展快速。然而對於大尺寸與可撓曲式液晶顯示器而言，常常會受到重力、按壓、彎曲等外力的影響，造成顯示效果不佳與產生波紋等問題。因此為了改善上述的問題，我們使用矽氧烷聚合物(polydimethylsiloxane，PDMS)為材料，製作具有微結構的液晶器件，利用微結構將液晶分子侷限在約一個像素(pixel)的空間內，藉此降低液晶分子受外力後流動造成顯示效果不佳的缺點。
矽氧烷聚合物材料不但具有高透光性、低表面自由能、高可塑性、化學穩定性佳、可撓性佳等優點，並且對環境造成的危害甚小，對於發展綠色顯示器而言是個極具潛力的材料。在本論文中，我們使用矽氧烷聚合物製作數種不同微結構的液晶器件，並透過分析比較各個樣品的光學圖像及其光電特性，例如光學圖像的分析、TV curve、響應時間等，藉以探討液晶分子在不同微結構侷限空間內的表現特性。實驗結果展示出：透過使用矽氧烷聚合物所製作的液晶器件，不但具有廣視角的特性，並在其對比度方面已經可達到一般顯示器的標準，並同時顯示出在可撓曲式液晶顯示器的可行性。

PDMS has not only the characteristics of good chemical and physical properties,flexible, low surface free energy, and good optically transparent, also has the advantages of low cost, low toxicity and environmental protection.
In this study we use PDMS to fabricate liquid crystal device with different micro-confined structures. We had a discussion about liquid crystal in the
micro-confined structure through optical textures and measured electro-optical characteristics on our device. Through the experiment we found the liquid crystal device with micro-confined structure had not only the characteristics of wide viewing angle and contrast ratio has been up to standard in normal display. And it also demonstrated the capability in flexible liquid crystal display.

論文審定書..............................................................................ii
誌謝..........................................................................................v
中文摘要.................................................................................vi
英文摘要................................................................................vii
目錄.......................................................................................viii
圖次..........................................................................................x
表次........................................................................................xii
第一章、緒論.........................................................................1
第二章、液晶簡介.................................................................2
2.1 液晶簡介..........................................................................2
2.2 液晶的異向性..................................................................6
2.3 液晶的彈性連續體理論..................................................9
第三章、液晶顯示模式.......................................................10
3.1 水平配向顯示模式........................................................10
3.2 垂直配向顯示模式........................................................11
3.3 多重區域垂直配向顯示模式........................................12
3.4 侷限空間液晶器件顯示模式........................................13
第四章、實驗部份...............................................................14
4.1 實驗材料........................................................................14
4.1.1 聚二甲基矽氧烷.........................................................14
4.1.2 液晶.... ........................................................................15
4.1.3 負型光阻.....................................................................16
4.1.4 配向膜材料.................................................................16
4.2 實驗原理........................................................................17
4.2.1 光微影製程技術.........................................................17
4.2.2 翻模轉移技術.............................................................18
4.2.3 表面自由能與量測.....................................................20
4.2.4 光電量測.....................................................................23
4.3 實驗儀器........................................................................25
4.3.1 光學微影系統.............................................................25
4.3.2 表面能分析儀.............................................................25
4.3.3 偏光顯微鏡.................................................................26
4.3.4 光電量測系統.............................................................27
4.4 實驗製程........................................................................28
4.4.1 侷限空間液晶器件之製程.........................................28
4.4.2 微結構母板之製程.....................................................29
4.4.3 上基板之製程.............................................................32
4.4.4 下基板之製程.............................................................33
第五章、表面自由能與光學圖像分析...............................34
5.1 PDMS 提供液晶分子垂直配向效果............................34
5.2 液晶分子的整體排列....................................................38
5.3 侷限空間的結構形貌與液晶配向的關係討論............40
第六章、光電特性分析.......................................................41
6.1 方位角與穿透光強度的關係討論................................41
6.2 TV curve.........................................................................43
6.3 光電量測參數分析比較................................................45
6.4 響應時間........................................................................47
第七章、結論.......................................................................48
參考資料...............................................................................50

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