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博碩士論文 etd-0618113-215539 詳細資訊
Title page for etd-0618113-215539
論文名稱
Title
動態驅動參數調變影響反射式膽固醇顯示效果之研究與應用
Influence of Dynamic Drive Scheme parameters on the performance of reflective cholesteric liquid crystal displays
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
84
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2013-06-25
繳交日期
Date of Submission
2013-07-26
關鍵字
Keywords
膽固醇液晶、動態驅動
dynamic drive scheme, cholesteric liquid crystal
統計
Statistics
本論文已被瀏覽 5711 次,被下載 348
The thesis/dissertation has been browsed 5711 times, has been downloaded 348 times.
中文摘要
傳統膽固醇液晶電子書在驅動上由於homeotropic到foal-conic時間較長,因此要讓膽固醇液晶完成狀態轉變須持續跨壓,每一行的跨壓時間累積起來會造成換頁時間過長得問題,但在DDS(Dynamic drive scheme)的驅動方式下,順利的縮短了換頁所需要的時間。
DDS是種利用膽固醇液晶在Homeotropic態與Transient態之間的轉換速度較快與focal-conic態與Homeotropic態之間的遲滯的特性而設計出的三相驅動方法,分別為preparation phase、selection phase和Evolution phase,其中preparation phase是將膽固醇液晶轉為Homeotropic態,selection phase為選擇之後的狀態為focal-conic態還是planar態若要轉為亮態(planar態)則維持在Homeotropic態,若要轉為暗態(focal-conic態)則維持在Transient態,而Evolution phase是利用homeotropic與focal-conic之間的磁滯來達到轉換為planar態或focal-conic態,達到快速驅動的目的。
  此論文主要為改變三項驅動中的各項參數後,對於顯示結果的影響,量測方式是使用labVIEW控制波形產生器使之輸出三項波形驅動膽固醇液晶,而藉由CCD拍攝驅動後的結果後,以Matlab判別其亮度,藉由樣測不同的selection phase電壓與evolution phase電壓組合的三項驅動結果,與Matlab判別出驅動結果的Reflection,即可以做出response surface圖,由圖中可以觀察到動態區動可操作的參數,此量測方法目的是可以量測出未知的膽固醇液晶動態驅動三項參數的選擇,當選擇preparation phase電壓較大可以讓動態驅動中的evolution phase項的電壓選擇更廣,皆可以達到顯示亮暗態的結果,而縮小selection phase時間,則會改變動態驅動中selection phase的Von及Voff電壓的選擇位置以及evolution phase可以選擇的電壓範圍減少,而縮短evolution phase時間,可以增加evolution phase的電壓選擇範圍。
了解這項參數的影響後,可以透過選擇參數來達到縮短selection phase的時間來達到有較快的換頁速度以及同時有較廣的evolution phase可選擇的電壓容易製作,可做為最佳化膽固醇液晶電子書的依據。
Abstract
The conventional driving method used in the cholesteric liquid crystal display has a major problem:The addressing time per line is about 50 ms which is too slow for high resolution display, therefore the DDS (dynamic drive scheme) method was developed to solve this problem.
DDS has three phase voltages to drive cholesteric liquid crystal display, which are the preparation phase, selection phase, and evolution phase. Two important properties of the cholesteric liquid crystal used by DDS are as follows; the transition from homeotropic state to transient planar state is on the order of 1 ms. Another transition from homeotropic state to focal-conic state is on the order of 100 ms.
Preparation phase is used to transit LC to homeotropic state. Selection phase is used to control the state after the dynamic drive. Evolution phase is used to transit the state to planar or focal-conic. This thesis studies the dynamic drive scheme parameters on the performance of reflective cholesteric liquid crystal displays.
The presented measurement method can be used to obtain the operating parameters of dynamic drive scheme for use in cholesteric liquid crystal reflective displays. As the selected voltage for preparation phase increases, the range of operating voltage in evolution phase gets widened. The required Von and Voff in selection phase would change and the voltage range of evolution phase narrows if we shorten the driving time of selection phase. In evolution phase, the reduction in operating time can raise the selection range of driving voltage.
目次 Table of Contents
摘要 iii
誌謝 vi
圖目錄 xii
1.緒論 1
2.液晶簡介 2
2-1 何謂液晶 2
2-2 液晶分類 3
2-3 液晶的物理特性 6
3.膽固醇液晶簡介 9
3-1 膽固醇液晶結構介紹[4] 9
3-2 膽固醇液晶光學特性 11
3-3 膽固醇液晶各個狀態介紹 12
3-4 膽固醇液晶用於電子書的驅動方法 14
4.實驗方法與過程 20
4-1 材料介紹與樣品製作 20
4-2 樣品間隙量測 22
4-3穿透頻譜量測 23
4-4 動態驅動架設與量測方法 24
5.實驗結果與討論 27
5-1三相驅動後膽固醇液晶狀態變化模型說明 27
5-2 動態驅動中各項參數變化對於顯示品質影響 32
5-2.1改變Preparation電壓對於顯示品質影響 32
5.2-2.改變Selection時間對於顯示品質影響 35
5-2.3.改變Evolution時間對於顯示品質影響 50
5-3 結果討論 63

參考文獻 67
參考文獻 References
[1] D.K. Yang, L. C. Chien, and J. W. Doane, “Cholesteric liquid-crystal/polymer-gel dispersion:reflective display applications”,SID Digest. 92, 23(1992)
[2] D. K. Yang, “Flexible bistable cholesteric reflective display,” J. Display Technol 2, 32(2006)
[3] G. W. Gray, “Thermotropic liquid crystal”, the Society of Chemial Industry(1987)
[4] A. Yariv, “Optical Electronics in Modern Communications”, 5th Ed., Oxford
UniVersity Press, New York, 1997.
[5]林宗賢,”液晶光電晶體雷射現象與其光控制研究”, 國立成功大學大學物理研究
所碩士論文(2004)
[6]黃雅鈴,”類紙式膽固醇液晶顯示器”, 成功大學物理學系博士班學位論文,(2005)
[7] D.-K. Yang and J. W. Doane, “Cholesteric liquid crystal/polymer gel dispersions: reflective displays” SID Intl. Symp. Digest Tech. Papers 23, 759 (1992).
[8] X.-Y. Huang, D.-K. Yang, P. J. Bos, and J. W. Doane, “Dynamic drive for bistable reflective cholesteric displays: a rapid addressing scheme”, SID Intl. Symp. Digest Tech. Papers 26, 347 (1995).
[9] XiaoYang Huang, DengKe Yang, and J. William Doane, “Transient dielectric study of bistable reflective cholesteric displays and design of rapid drive scheme”, American Institute of Physics. Appl. Phys. Lett. 67, 1211 (1995);
[10] B. Bahoadur,”Liquid Crystals Applications and Uses”, World Scientific Press, Singapore,
[11]D.K. Yang, J. L. West,L.C. Chien ,and J.W. Doane”Control of reflectivity and bistability in displays using cholesteric liquid crystals”J. Appl. Phys. 76, 1331 (1994);
[12]W. Greubel,”Bistability behavior of texture in cholerteric liquid crystals in an electric field”, Appl. Phys.Lett. 25, 5(1974)
[13]H.J. Cole, M.J. Clarke,S.M. Morris,B.J. Broughton, and A.E. Blatch “Strong flexoelectric behavior in bimesogenic liquid crystals”,J. Appl. Phys. 99, 034104(2006)
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