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研究生:黃俊欽
研究生(外文):Jyun-Cin Huang
論文名稱:奈米粒子混摻在雙穩態液晶元件之製作與分析
論文名稱(外文):Fabrication and characterization of the nanoparticles-doped bistable liquid crystal devices
指導教授:游信和游信和引用關係
指導教授(外文):Hsin Her Yu
學位類別:碩士
校院名稱:國立虎尾科技大學
系所名稱:光電與材料科技研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:41
中文關鍵詞:液晶POSS預傾角雙穩態
外文關鍵詞:LCPOSSPretilt angleBistable
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本研究於液晶顯示元件之PI配向層中添加可引致液晶分子產生垂直排列效果的POSS奈米粒子以調控液晶分子預傾角,並利用偏光顯微鏡(POM)、Agilent LCR阻抗分析儀、外差干涉量測系統、表面接觸角量測系統分析添加POSS對於液晶顯示元件光電特性所造成的影響。當POSS添加濃度提高時,液晶分子預傾角將隨之上升,PI/POSS之表面自由能與液晶盒之光學穿透度與雙折射率因此下降,而透過添加不同POSS濃度將可達到全範圍控制預傾角的效果。藉由添加POSS使液晶分子預傾角調控至45.7o時,液晶分子之bend與splay自由能會達到平衡,在外加電壓後因此產生雙穩態顯示效果。
The alignment layer in liquid crystal (LC) device was prepared by nanoparticles of polyhedral oligomeric silsesquioxane (POSS) blended into Polyimide (PI) in this study. Bistable display performance can be obtained as the pretilt angle of the alignment layser layer in the liquid crystal molecules was controlled. In this thesis we found that vertical alignment in the LC cell can be induced by nano-POSS doped in PI layers and the pretilt angles of the cells were modulated by the amounts of POSS. The electric and optical properties were investigated by Polarized Optical Microscope (POM), Agilent 4284A precision LCR meter, Heterodyne Interferometric system, and contact angle meter, respectively. In addition, the pretilt angle of LC molecules and bistable splay-bend LCD can be achieved by splay-bend switching based on pretilt angle controlled at 45.7o after appropriate nano-POSS doping and the rubbing depths.
中文摘要....................................i
Abstract...................................ii
致謝......................................iii
目錄.......................................iv
表目錄....................................vii
圖目錄...................................viii
第一章 緒論.................................1
1.1 前言....................................1
1.2 液晶簡介................................2
1.2.1 液晶分類..............................2
1.2.2 液晶的物性............................3
1.2.3 液晶的介電異向性......................4
1.3 液晶分子與配向..........................6
1.4 多面體矽氧烷材料........................8
1.4.1 發展起源..............................8
1.4.2 POSS/PI混摻...........................9
1.5 光學補償彎曲(OCB)顯示器................11
1.6 量測原理...............................12
1.6.1 表面自由能量測原理...................12
1.6.2 偏光顯微鏡觀察原理...................12
1.6.3 預傾角量測原理.......................13
1.6.4 相位延遲(Phase retardation)量測原理..13
1.6.5 光穿透率(Transmittance)量測原理......14
1.6.6 介電常數(dielectric constant)量測原理16
1.6.7 雙穩態液晶顯示原理...................16
1.7 專利檢索...............................17
第二章 實驗內容............................19
2.1 實驗材料...............................19
2.2 液晶盒製作.............................20
2.3 觀察與量測系統說明.....................21
2.3.1 接觸角量測分析系統...................21
2.3.2 偏光顯微鏡觀察液晶排列情形...........21
2.3.3 預傾角量測...........................21
2.3.4 相位延遲量測.........................22
2.3.5 穿透率-電壓量測......................23
2.3.6 電容-電壓量測........................23
第三章 結果與討論..........................24
第四章 結論................................32
第五章 未來展望............................33
第六章 參考文獻............................34
英文論文大綱...............................36
個人簡歷...................................41
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