簡易檢索 / 詳目顯示
| 研究生： |
陳嘉佑 Chen, Chia-Yu |
|---|---|
| 論文名稱： |
偶氮染料摻雜液晶在塑膠基板光配向之研究 Studies of photo-alignment on plastic substrates using azo dye-doped liquid crystals |
| 指導教授： |
傅永貴
Fuh, Ying-Guey Andy |
| 學位類別： |
碩士 Master |
| 系所名稱： |
理學院 - 物理學系 Department of Physics |
| 論文出版年： | 2010 |
| 畢業學年度： | 98 |
| 語文別： | 中文 |
| 論文頁數： | 110 |
| 中文關鍵詞： | 液晶 、偶氮染料 、可撓式 |
| 外文關鍵詞： | liquid crystals, azo dye, flexible |
| 相關次數： | 點閱：78 下載：3 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
本論文主要研究以摻雜偶氮染料的液晶材料在塑膠基板上的光配向特性，利用偶氮染料-甲基紅(methyl red, MR)的吸附效應來達到液晶光配向的效果。實驗中所使用的塑膠基板分別為Polycarbonate, PC (聚碳酸酯) 和Polyethylene terephthalate, PET(聚對苯二甲酸乙二酯)基板。PC基板的一面鍍有透明導電膜IZO (indium-zinc-oxide，氧化銦鋅)及另一面為經硬化處理的阻水氧層；而PET基板的兩面分別為鍍有透明導電膜ITO (indium-tin-oxide，氧化銦錫)及另一面的阻水氧層。由實驗結果得知，MR吸附在IZO表面上達成光配向所需要時間比吸附於素玻璃和ITO表面短，且MR無法吸附於本實驗所使用之PC及PET基板經硬化處理的阻水氧層上。實驗中利用該機制於偶氮染料摻雜向列型液晶中製作出一可光寫入、可電控並可複寫的可撓式液晶顯示器，並探討其光電特性及吸附之染料分子在外力彎曲下的穩定、均勻性。此外，另一於偶氮染料摻雜膽固醇液晶中利用MR雜亂吸附的特性製作一可光寫入、可電控並可複寫的可撓式液晶顯示器，同時探討其光電特性及吸附的染料分子在外力彎曲下的穩定和均勻性。實驗中為改善可撓式液晶顯示器在外力彎曲下的穩定和均勻性，本論文提出了兩種新製程，分別為2 step UV curing及光間隙子方法，其基本的概念皆為使間隙物與基板表面產生鍵結的穩固力量來達到改善均勻度的目的，實驗結果顯示此兩種新製程皆可改善基板彎曲下的顯示資訊的均勻度。該反射式液晶顯示器可應用於製作一智慧卡(smart card)，該智慧卡的特性為當光寫入資訊圖樣後，所寫入圖像會被隱藏於智慧卡內，可藉由彎折此可撓式智慧卡數次後將寫入圖樣顯影。另可利用升溫使液晶超過相變點後再降回室溫，或是利用外加電壓再將電壓釋放的方式關閉所寫入之圖樣，同時如上述彎折的方法亦可再使該圖樣出現，相關機制於論文中皆有詳細探討。
This thesis studies the photo-alignment on plastic substrates using azo dye-doped liquid crystals (ADDLCs). The adsorption of azo dye (methyl red, MR) is the key to achieve photo-alignment of liquid crystals. Two kinds of flexible substrates, including polycarbonates (PC) substrates and polyethylene terephthalate (PET) substrates are used to fabricate the ADDLC samples. The two surfaces of the used PC/PET substrate are coated with indium-zinc-oxide/indium-tin-oxide (IZO/ITO) and hard coating of water vapor-oxygen barrier, respectively. The experimental results show that the MR dyes adsorption onto IZO-coated substrates is much faster than those onto bare glass substrate and ITO-coated substrates. Moreover, it is the first report that the MR dyes cannot be adsorbed onto the used PC/PET substrates coated with hard coating but no transparent electrode films. The technique of MR adsorption onto plastic substrates is employed to fabricate optically addressable, optically/thermally erasable, electrically switchable, and optically rewritable flexible azo-dye-doped nematic liquid crystal (ADDNLC) LCDs. Their electro-optical properties and the uniformity of the adsorbed MR under bending are examined as well. Additionally, it is experimentally shown that the MR dyes disorderly adsorbed onto the plastic substrates in azo dye-doped cholesteric liquid crystals (ADDCLCs) can transform the CLC textures from planar to focal conic, and can be used to fabricate optically addressable, electrically switchable, thermally erasable and optically rewritable flexible LCDs. In addition to the above described approach, two different approaches, 2 step UV curing method and photospacer method, to improve the uniformity of the fabricated ADDCLC samples under bending are also demonstrated. The main mechanism of these two approaches is to stabilize the spacers onto the substrate by polymer. The experimental results show that the uniformity of the fabricated sample under bending can be improved using these two approaches. Such a flexibly reflective LCD can be applied for use as a smart card, in which the displayed patterns are initially invisible, but become visible upon bending it for several times. The addressed patterns can be switched to invisible state by heating the smart cards above the clearing temperature of ADDLCs, followed by cooling it to room temperature, or applying a suitable voltage. Afterwards, with bending the smart card for several times, the addressed patterns reappear. The details of the mechanism are discussed in this thesis.
[1] P. G. de Gennes and J. Prost, “The Physics of Liquid Crystals”, 2nd ed., Clarendon Press, Oxford(1993).
[2] Birendra Bahadur, “Liquid Crystals：Applications and Uses”, Vol.3, World Scientific, Singapore(1990).
[3] L. M. Blinov and V. G. Chigrinov, “Electrooptic Effects in Liquid Crystal Materials”, Springer-Verlag Publishing Co., New York (1994)
[4] G. W. Gray, “Thermotropic Liquid Crystals”, the Society of Chemical Industry(1987).
[5] Andrew J. Lovinger, Karl R. Amundson and Don D. Davis, Chem. Mater. 6, 1726(1994).
[6] Grant R. Fowles, “Introduction to Modern Optics”, 2nd ed., University of Utah, New York(1975).
[7] 朱自強, 王仕璠, 蘇顯渝, “現代光學教程 ”, 四川大學出版社,
成都(1990).
[8] Iam-Choon Khoo, “Liquid Crystals-Physical Properties and Nonlinear Optical Phenomena”, John Wiley Sons Press, New York(1995).
[9] C. W. Oseen, Trans. Faraday Soc. 29, 883(1933).
[10] H. Zocher, Trans. Faraday Soc. 29, 19(1933).
[11] F. C. Frank, Discuss. Faraday Soc. 25, 19(1958).
[12] 松本正一 角田市良 合著,劉瑞祥 譯, “液晶之基礎與應用”,國
立編譯館出版 (1996).
[13] 苗村 省平 著,陳建銘 譯, “液晶顯示器技術入門” ,全華圖書
(2005).
[14] 林良貞, “Highly efficient and polarization-independent Fresnel lens based on dye-doped liquid crystal using double-side photo-alignment technique”, 國立成功大學, 物理研究所 (2007).
[15] 液晶應用技術研究會 著, “最新液晶應用技術”, 建興出版社
(1997).
[16] Pochi Yeh et al, “Optical of Liquid Crystal Display”, John Wiley & Sons Inc. (2006).
[17] H.Hervel, W. Urbach and F. Rondelez, J. Chem. Phys. 68, 2725(1978).
[18] K. Ichimura, Y. Suzuki, T. Seki, A.Hosoki, and K.Aoki, Langmuir 4, 1214 (1988).
[19] I. Ja’nossy, A.D. Lloyd, B. S. Wherrett, Mol. Crys. & Liq. Cryst.203, 74 (1991).
[20] I. Ja’nossy, T. Kosa, Opt. Lett. 17, 1183 (1992).
[21] I. Ja’nossy, Phys. Rev. E 49, 8410 (1994).
[22] W. M. Gibbons, P. J. Shannon, S. T. Sun, and B. J. Swetlin, Nature 351, 49 (1991).
[23] W. M. Gibbons, T. Kosa, P. Palffy-Muhoray, P. J. Shannon and S. T. Sun, Nature 377, 43 (1995).
[24] S. Slussarenko, O. Francescangeli and F. Simoni, Appl. Phys. Lett.71, 3613 (1997).
[25] F. Simoni, O. Francescangeli,Yu. Reznikov, S. Slussarenko, Opt.Lett. 22, 549 (1997).
[26] K.-T. Cheng, C.-K. Liu, T.-L. Ting and Andy Y.-G. Fuh, Opt. Commun. 281, 5133 (2008).
[27] S.-Y. Huang, S.-T. Wu and Andy Y.-G. Fuh, Appl. Phys. Lett. 88, 041104 (2006).
[28] K. Kim, H. Kim, M. Kim, H.- G.- Kim, S.- W. Choi and S.- S.Kim, J. J. of Appl. Phys. 48, 060203 (2009)
校內：2013-08-18公開校外：2015-08-18公開