利用兩種不同的Nematic低分子液晶混合誘導出Smactic相，然後再分別混合一種具有光學旋光性chiral 化合物(CB15與C15)，誘導出Cholesteric相。其中HPPB/E7/CB15複合系液晶在clolesteric相下，展現出特殊的光電現象，在未加入偏光板的情況下，會發現在室溫藉由電場的施加而出現絢麗的色彩-具有可見光的選擇性吸收波長。再將此複合系液晶與高分子（Pdi-iPF）混合後比較之。而HPPB/E7/C15複合系液晶則藉由熱轉移來達成光散亂與光透明的現象，使液晶面板會隨著溫度的不同而呈現明暗的變化。這實驗是對三種低分子液晶複合系的電熱光學特性研究，並討論C15的含量對複合系液晶相與電熱光學特性的影響。期望應用於電熱控制的光閘或窗廉。

Under the cholesteric phase, the composite of HPPB/E7/CB
15 has a special elect optical effect. Under the room temperature, we find some beautiful colors by electric field without polarizer. It tells us that the kind of liquid crystal phase has the selected absorptive and visible light wavelength behavior. Then we mixed it with Pdi-iPF and compare with the unmixed one. The composite of HPPB/E7/C15 can be achieved the light scattering and light opaque by thermal transmission, and it makes the different contrast of the liquid crystal panel with different temperature.

目 錄
頁次
書名頁…………………………………………………………..Ⅰ
推薦函……………………………………………………………II
論文口試委員審定書…………………………………………III
授權書…………………………………………………………..VI
中文摘要………………………………………………………VII
英文摘要……………………………………………………..VIII
誌謝……………………………………………………………..IX
目錄………………………………………………………………X
表目錄…………………………………………………………XIV
圖目錄………………………………………………………….XV
第一章 緒論……………………………………………………..1
1-1前言………………………………………………………1
1-2液晶及液晶顯示器的研發歷史………………………2
1-3研究背景………………………………………………...2
1-4液晶的基本構造………………………………………..3
1-5膽固醇型液晶(Cholesteric)的基本性質…………..11
1-5-1膽固醇型液晶的光學組織……………………11
1-5-2膽固醇型液晶的光學性質……………………12
1-6液晶分子配列的種類………………………………..16
1-7表面張力對分子配列的影響……………………….18
1-8研究目的……………………………………………….20
第二章 原理……………………………………………………21
2-1液晶的複折射性和光物性…………………………..21
2-1-1折射率的異方性……………………………….21
2-1-2折射率異方性與光學性質……………………23
2-2介電異方性…………………………………………….26
2-3螺旋距之測量…………………………………………28
2-3-1 Cano楔形槽法…………………………………28
2-3-2大曲度半徑透鏡法…………………………….29
2-3-3選擇性光散亂法……………………………….30
2-3-4指紋狀組織觀測法…………………………….30
第三章 實驗方法……………………………………………..31
3-1材料……………………………………………………..31
3-2儀器……………………………………………………..33
3-3測試樣品的製作………………………………………33
3-3-1配製三成分複合系液晶………………………33
3-3-2配製液晶/高分子複合膜（PDLC）…………34
3-4偏光顯微鏡(POM)觀察………………………………34
3-5示差掃描熱卡計(DSC)測試…………………………34
3-6液晶元件的製作………………………………………35
3-7光電測試裝置…………………………………………35
第四章 結果與討論…………………………………………..37
4-1複合系液晶HPPB/E7/CB15…………………………37
4-1-1光學組織研究…………………………………..37
4-1-2電場測試………………………………………..37
4-2複合系液晶（HPPB/E7/CB15）/高分子Pdi-iPF複合膜……………………………………………………..44
4-2-1光學組織研究…………………………………..44
4-2-2電場測試………………………………………..44
4-3複合系液晶HPPB/E7/C15…………………………..54
4-3-1光學組織研究-HPPB/E7/C15，45/55/X 的液晶組織……………………………………………54
4-3-2 HPPB/E7/C15(45/55/35)在配向薄元件的液晶組織觀察………………………………………..56
4-3-3不同比例的組織(texture)比較……………….67
4-3-4熱分析研究……………………………………..67
4-3-5複合系相圖……………………………………..69
4-3-6熱光學性質研究……………………………….71
4-3-7電場測試………………………………………..73
第五章 結論……………………………………………………88
參考文獻………………………………………………………..89
自傳……………………………………………………………..93

1.P Watson*, J. E. Anderson and V. Sergan, P. J. Bos " The transition mechanism of the transient planar director configuration change in cholesteric liquid crystal displays," Liq. Cryst. 1999, 26, 9
2.P. Rudquist , L. Komitov and S. T. Lagerwall " Volume-stabilized ULH structure for the flexoelectro-optic effect and the phase-shift effect in cholesterics," Liq. Cryst. 1998, 24, 3
3.T. Geelhaar, "Liquid Crystals for display application," Liq. Cryst. 1998, 24, 1
4.Klaus J. K. Semmler Theo J. Dingemans, Edward T. Samulski, " Biaxial smectic phases in non-linear mesogens: optical properties and phase behavier of an oxadiazole liquid crystal," Liq. Cryst. 1998, 24, 6
5.Jenn Chiu Hwang and Yu Chyi Tsai, "Bistable switching effects and thermal storage of polymer/induced smectic phase composite film," Jpn. J. appl. Phys.. 1997, 36, 6A
6.K. Diekmann, M. Schumacher and H. Stegemeyer, " Nucleus growth in liquid crystals," Liq. Cryst. 1998, 25, 3
7.I. Dierking, L. L. Kosbar, A. C. Lowe and G.A. Held, "Polymer network structure and electro-optic performance of polymer stabilized cholesteric textures I. The influence of curing temperature," Liq. Cryst. 1998, 24, 3
8.Katsumi Kondo, Atsuo Fukuda and Eiichi Kuze, 1981, Jpn. J. Appl. Phys., 20, 1779.
9.Shung-Long Wu and Wen-Jiunn Hsieh, 1996, Liq. Cryst., 21, 783.
10. W. Kuczynski and H. Stegemeyer, 1995, Mol. Cryst. Liq. Cryst., 260, 377.
11. J. S. Patel, Sin-Doo Lee, Senong-Woo Suh and J. W. Goody, 1993, Liq. Cryst., 13, 313.
12. N. L. Kramarenko, G. P. Semenkova, V. I. Kulishov, A. S. Tolochko, L. A. Kutula, V. V. Vaschenko and T. V. Handrimajlova, 1994, Liq. Cryst., 17, 351.
13.Sadahito Uto, Eisuke Tazoh, Masanori Ozaki and Katsumi Yoshino , "Formation of Piled Circular Texture Induced by Alternating Electric Field in Freely Suspended Ferrolectric Liquid crystal Films," Jpn. J. Appl. Phys. 1997, 36 9A/B L1198-L1200
14.Jenn Chiu Hwang, Shi Chang Liang and Kung Heng Liang," A Novel Phase Behavior and optical properties in a (Two Nematics/Cholesteric) Liquid Crystal Composite sysytem," Jpn. J. Appl. Phys, 1998, 37 8
15. Tsutomu Kadotani, Seiji Taki, Hirotaka Okabe and Shoichi Kai, "Molecular Alignments in Liquid Crystal Mixtures of *CB with 10CB Determined by Scanning Tunneling Microscopy," Jpn. J. Appl. Phys, 1996, 35 10B L1345-L1347
16.Keizo Itoh, Yoichi Takanishi, Jun Yokoyama, Ken Ishikawa, Hideo Takeoe and Atsuo Fukuda, "Helicoid-Stabilized Tristable Switching in Ferroelectric Liquid Crystal Mixtures with Ultranshort pitch," Jpn. J. Appl. Phys, 1997, 37 6B L784-L787
17.I. Dierking, L. L. Kosbar, A. Afzali-Ardakani, A. C. Lowe, and G. A. Held, "Two-stage switching behavior of polymer stabilized cholesteric," J. Appl. Phys. 81 7
18.Jenn Chiu Hwang and Yu Chyi Tsai, "Phase Behavior and Bistable Switching Effect of the Induced Smectic Phase by Mixing Two Low Molecular Weight Nematic Liquid Crystals," Jpn. J. Appl. Phys, 1997, 36 4A pp. 2214-2217
19.Jenn Chiu Hwang, Shi Chang Liang and Kung Heng Liang, " Electrooptical Properties in a composite System Consisting of Two Nematic and a Cholesteric Liquid Crystal," Jpn. J. Appl. Phys, 1999, 38 1A pp.131-134 A. J. Slaney and J. W. Goodby, 1991, Liq. Cryst., 9, 849.
20. A. Anakkar, A. Daoudi, J.-M. Buisine, N. Isaert, F. Bougrioua and H. T. Nguyen, 1996, Liq. Cryst., 20, 411.
21.I. Dierking, F. Giebelmann and P. Zugenmaier, 1994, Liq. Cryst., 17, 17.
22.Shuichi Murakami and Hiroyoshi Naito ,"Electrode and interface polarizations in nematic liquid crystal cells," Jpn. J. Appl. Phys, 1997, 36 4A pp.2222-2225
23.I. Dierking and S. T. Lagerwall ,"A review of textures of the TGBA phase underdifferent anchoring geometries," Liq. Cryst. 1999, 26, 1
24.R. R. Swisher, H. Huo, and P.P. Crooker, "The cholesteric-nematic transitions in droplets subjected to electric fields," Liq. Cryst. 1999, 26, 1, 57-62