博碩士論文 103226039 詳細資訊




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姓名 唐易(Yi Tang)  查詢紙本館藏   畢業系所 光電科學與工程學系
論文名稱 液晶摻雜十二氫氧基硬酯酸於鍍有聚乙烯基咔唑薄膜液晶盒中之多穩態特性及其應用
(Multi-stable characteristics of 12-hydroxysteric acid-doped liquid crystals in a poly(N-vinylcarbazole) film-coated liquid crystal cell and its applications)
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檔案 [Endnote RIS 格式]    [Bibtex 格式]    [相關文章]   [文章引用]   [完整記錄]   [館藏目錄]   至系統瀏覽論文 (2021-7-1以後開放)
摘要(中) 現今科技日益進步,在液晶領域的研究發展趨於成熟,近年來持續開發新技術並應用在許多相關領域上。然而,近期環保的議題受到熱烈的討論及重視,許多團隊在各個不同領域投入大量人力進行節能減碳的相關研究,而在液晶顯示科技上,最直接的方法即為雙穩態的液晶顯示技術。近幾年來,有許多雙(多)穩態的液晶顯示技術已被開發,如利用膽固醇液晶多種穩態結構的特性、在外加直流電場下改變其自發性極化方向的表面穩定鐵電型液晶之雙穩態特性及液晶摻雜聚合物的多穩態技術等,而如何能達到多穩態且可重複使用的顯示元件,更是值得詳細探討與研究的課題。
本論文利用液晶摻雜自組成材料-十二氫氧基硬酯酸(HSA),於基板表面塗佈光導體聚合物-聚乙烯基咔唑(PVK)薄膜之液晶盒中,製作多穩態且可重複抹除及寫入圖案的液晶顯示元件。其中,主要利用由氫鍵鍵結之HSA枝條結構穩固液晶分子排列,並由提高溫度使HSA之氫鍵斷裂,同時藉由PVK薄膜之光導體特性,經由照射紫外光使照光區域之液晶受外加電場影響而改變其排列方列,並在外加電場同時,將液晶盒溫度降溫以使HSA重新鍵結,最後關閉外加電壓,可得同時存在於液晶盒中的兩種液晶排列結構,故可將其應用在液晶顯示元件。本論文將分別討論以下三主題:
(1)自組成材料-HSA及光導體聚合物-PVK之特性;
(2)利用PVK薄膜及HSA製作TN結構之多穩態液晶顯示元件,該元件所顯示圖案的穩態液晶排列為照射紫外光區域之垂直結構,而背景為未照射紫外光區域之原TN結構,故在上下兩穿透軸相互正交偏振片下分別為暗態與亮態,如此即可顯示圖案。
(3)利用PVK薄膜及HSA製作多穩態散射型液晶顯示元件,該元件所顯示圖案的穩態液晶排列為照射紫外光區域之穿透態垂直結構,而背景為未照射紫外光區域所維持之原散亂結構,故其目視圖分別為穿透態與散射態,如此即可顯示圖案。
因此,本論文所提出多穩態液晶顯示元件之技術,其擁有可重複抹除及寫入圖案、利用光控及電控可達成灰階效果、低操作電壓及長時間穩態等特性之優點,故相信不僅可實際應用於顯示元件上,並可應用於許多液晶光學元件,如液晶光柵及液晶透鏡等。
摘要(英) Nowadays, liquid crystal (LC) technology is getting more and more mature due to its novel developments and applications in many electro-optical fields. Recently, the issues of environmental protection are discussed and valued enthusiastically. Many scientists have been trying hard to pay much attention to the topics of carbon reduction from different viewpoints. In LC display (LCD) technology, the simplest technique is the development of bistable and multi-stable LCDs, such as the bistable textures of cholesteric LCs, the bistable properties of surface-stabilized ferroelectric LCs, multi-stable techniques of polymer network LCs, etc. Accordingly, it is worthwhile to develop the multi-stable and reusable display devices.
This study presents the multi-stable and reusable LC display devices using 12-hydroxysteric acid (HSA)-doped LCs in a poly(N-vinylcarbazole) (PVK) film-coated LC cell. It mainly adopted the reconnections of hydrogen-bond of HSA to form the branches to stabilize the LC structures. By increasing the temperature to that higher than the melting point of HSA, the strength of the intermolecular hydrogen bonds decreased so that the gelators were homogeneously dissolved into the LC host again. In the meantime, an external voltage was applied and the UV light was irradiated onto the LC cell through a photo-mask having the desired patterns simultaneously. The LCs in the regions with UV exposure reoriented toward the direction of the electric field due to the property of the photo-conductive PVK films. Thereafter, the LC cell was cooled down to room temperature and the hydrogen bonds reconnected automatically so that the gelators reassembled themselves in the direction of the reoriented LCs to stabilize the LC structures. Finally, two different structures in one LC cell were obtained, and such structures can also be used to demonstrate LC display devices. In this thesis, the following three parts are discussed in detail.
(1)The electro-optical properties of the self-assembly material-HSA and photoconductive polymer-PVK.
(2)Multi-stable LC display devices using HSA-doped LCs in a PVK film-coated LC cell. The two stable LC structures are the homeotropic structures in the regions with UV illumination and the twisted nematic structures in the regions without UV illumination. Then, the addressed patterns and their background observed under cross-polarizers present dark (homeotropic structures) and bright (twisted nematic structures) states, respectively.
(3)Multi-stable scattering mode LC display devices using HSA-doped LCs in a PVK film-coated LC cell. The two stable LC structures are the homeotropic structures in the regions with UV illumination and the scattering structures in the regions without UV illumination. Thus, the addressed patterns and their background present transparent state and scattering state, respectively.
Consequently, this study presents multi-stable LC display devices with the advantages of addressing, erasing, and re-addressing abilities, grayscale control, and so on. Considering the practical applications of the LC devices, they can be used not only in display devices but also in LC optical elements, such as LC gratings, LC lenses, and others.
關鍵字(中) ★ 液晶
★ 十二氫氧基硬酯酸
★ 聚乙烯基咔唑
★ 多穩態
關鍵字(英) ★ Liquid Crystals
★ HSA
★ PVK
★ multi-stable
論文目次 中文摘要 i
Abstract iii
誌謝 v
目錄 vi
圖目錄 x
符號說明 xvi
第一章 緒論 1
§1-1 前言 1
§1-2 研究動機 1
§1-3 論文架構 2
第二章 液晶簡介 4
§2-1 液晶的發現 4
§2-2 何謂液晶 5
§2-3 液晶的分類 6
§2-3-1 向列型液晶(Nematics) 8
§2-3-2 膽固醇型液晶(Cholesterics;簡稱N*) 9
§2-3-3 層列型液晶(Smectics;簡稱Sm) 12
§2-3-4 圓盤狀液晶(discotic LCs) 15
§2-4 液晶的物理特性 16
§2-4-1 液晶折射率的異向性∆n 16
§2-4-2 介電異向性∆ε 21
§2-4-3 連續彈性體理論(elastic continuum theory) 22
§2-4-4 溫度對液晶相之影響 24
§2-4-5 Freedericksz transition 25
第三章 相關理論介紹 26
§3-1 自組成(self-assembly)材料 26
§3-1-1 氫鍵(hydrogen-bond) 27
§3-1-2 液晶摻雜自組成材料之相關特性 27
§3-2 聚乙烯基咔唑[poly(vinylcarbazole), 簡稱PVK]薄膜 30
§3-2-1 向列型液晶在聚乙烯基咔唑薄膜下之配向理論 31
§3-2-2 聚乙烯基咔唑薄膜之光導電性 33
§3-3 扭轉向列型液晶(TN-LC) 36
§3-4 液晶散射理論 42
§3-4-1 Polymer-Dispersed Liquid Crystals (PDLCs) 43
§3-4-2 Polymer-stabilized Cholesteric Textures (PSCT) 45
第四章 樣品製作與實驗方法及架設 50
§4-1 材料介紹 50
§4-2 液晶盒樣品製作 53
§4-2-1 液晶混合物配製 53
§4-2-2 玻璃基板處理 53
§4-2-3 液晶盒製作及注入液晶 54
§4-3 實驗光路架設及實驗方法 57
§4-3-1 空液晶盒之間隙厚度量測 57
§4-3-2 偏光顯微鏡觀察液晶樣品結構 59
§4-3-3 利用氦氖雷射量測液晶樣品光電特性 60
第五章 實驗結果與討論 62
§5-1 自組成材料之基本特性測試 62
§5-1-1 自組成材料-HSA 62
§5-1-2 光導體PVK薄膜 65
§5-2 利用PVK薄膜及HSA製作TN結構之多穩態液晶顯示元件 68
§5-2-1 工作原理 68
§5-2-2 不同紫外光強度對液晶盒電壓-穿透曲線之影響 70
§5-2-3 寫入圖案及結果觀察 72
§5-2-4 利用不同強度之紫外光製作灰階顯示 75
§5-2-5 不同強度之紫外光對PVK及液晶反應時間的影響 76
§5-3 利用PVK薄膜及HSA製作散射型液晶顯示元件 80
§5-3-1 工作原理 80
§5-3-2 液晶摻雜不同濃度HSA對其散射效果影響 82
§5-3-3 寫入圖案 84
第六章 結論與未來展望 87
§6-1 結論 87
§6-2 未來展望 89
參考文獻 92
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指導教授 鄭恪亭(Ko-Ting Cheng) 審核日期 2016-7-21
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