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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 蔡永傑(Wing-Kit Choi) | |
dc.contributor.author | Bo-Kai Tseng | en |
dc.contributor.author | 曾柏凱 | zh_TW |
dc.date.accessioned | 2021-07-10T22:16:36Z | - |
dc.date.available | 2021-07-10T22:16:36Z | - |
dc.date.copyright | 2017-08-31 | |
dc.date.issued | 2017 | |
dc.date.submitted | 2017-08-15 | |
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Fast switching liquid crystals for color-sequential LCDs. Journal of Display Technology. 3: 250-252. [11] Chen, K.M., et al. (2010). Submillisecond gray-level response time of a polymer-stabilized blue-phase liquid crystal. Journal of Display Technology. 6: 49-51. [12] Lee, J.H., et al. (2007). Novel color-sequential transflective liquid crystal displays. Journal of Display Technology. 3: 2-8. [13] Zavracky, M., et al. (1997). Head-mounted display apparatus with color sequential illumination, U.S. Patents. US5673059 A [14] Kokawa, S., et al. (1995). Liquid crystal display, U.S.Patents. US 5467208 A [15] Schadt, M. and Helfrich, W. (1971). Voltage‐dependent optical activity of a twisted nematic liquid crystal. Applied physics letters. 18: 127-128. [16] Chigrinov, V.G. (1999). Liquid crystal devices: physics and applications. [17] Oh‐e, M. and Kondo, K. (1995). Electro‐optical characteristics and switching behavior of the in‐plane switching mode. Applied physics letters. 67: 3895-3897. [18] Oh‐e, M. and Kondo, K. (1996). Response mechanism of nematic liquid crystals using the in‐plane switching mode. Applied physics letters. 69: 623-625. [19] Lee, S., et al. (1998). Electro-optic characteristics and switching principle of a nematic liquid crystal cell controlled by fringe-field switching. Applied physics letters. 73: 2881-2883. [20] Hong, S.H., et al. (2000). Electro-optic characteristic of fringe-field switching mode depending on rubbing direction. Japanese Journal of Applied Physics. 39: L527 [21] Ting, C.L. and Huang, W.F. (2005). Multi-domain vertical alignment liquid crystal display and driving method thereof, U.S. Patents. US 6922183 B2 [22] Kim, K.H., et al. (1998). Domain divided vertical alignment mode with optimized fringe field effect. Proceedings of Asia Display. 98: 383-386. [23] Kim, S.G., et al. (2007). Stabilization of the liquid crystal director in the patterned vertical alignment mode through formation of pretilt angle by reactive mesogen. Applied physics letters. 90: 261910. [24] Lee, Y.J., et al. (2009). Surface-controlled patterned vertical alignment mode with reactive mesogen. Optics express. 17: 10298-10303. [25] Bos, P.J. and Koehler/beran, K.R. (1984). The pi-cell: a fast liquid-crystal optical-switching device. Molecular Crystals and Liquid Crystals. 113: 329-339. [26] Miyashita,T. Vetter, P.J. Yamaguchi, Y. and Uchida, T. (1995). Wide‐viewing‐angle display mode for active‐matrix LCDs using a bend‐alignment liquid‐crystal cell. Journal of the Society for Information Display. 3: pp. 29-34,. [27] Meyer, Robert B., et al. (1975). Ferroelectric liquid crystals. Journal de Physique Lettres 36: 69-71. [28] Miyashita, T., et al. (1995). Wide‐viewing‐angle display mode for active‐matrix LCDs using a bend‐alignment liquid‐crystal cell. Journal of the Society for Information Display. 3: 29-34. [29] Chen, K.M., et al. (2010). Submillisecond gray-level response time of a polymer-stabilized blue-phase liquid crystal. Journal of Display Technology. 6: 49-51. [30] Nakamura, H. and Sekiya, K. (2001). 51.1: Overdrive method for reducing response times of liquid crystal displays. SID Symposium Digest of Technical Papers. 32: 1256-1259. [31] Choi, W.K. and Wu, S.T. (2008). Fast response liquid crystal mode, U.S. Patents. US7298445 B1. [32] Choi, T.H., et al. (2016). Fast fringe-field switching of a liquid crystal cell by two-dimensional confinement with virtual walls. Scientific reports. 6: 27936. [33] Chen, H., et al. (2017). A low voltage liquid crystal phase grating with switchable diffraction angles. Scientific reports. 7: 39923 [34] Jiao, M., et al. (2008). Submillisecond response nematic liquid crystal modulators using dual fringe field switching in a vertically aligned cell. Applied physics letters. 92: 111101.. [35] Choi, W.K. and Tung, C.H. (2017). P‐148: Fast‐Response VA‐FFS Liquid Crystal Mode using 3D Electrode Design. SID Symposium Digest of Technical Papers. 48: 1838-1840. [36] Lien, A. (1990). Extended Jones matrix representation for the twisted nematic liquid‐crystal display at oblique incidence. Applied physics letters. 57: 2767-2769. [37] Gou, F., et al. (2017). Submillisecond-response liquid crystal for high-resolution virtual reality displays. Optics express. 25: 7984-7997. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/77698 | - |
dc.description.abstract | 隨著當代科技正日異月新地不斷進步中,液晶顯示器亦成為不可或缺的重要產品之一,並由於發光二極體產業日趨成熟之下,場色序式顯示器(Field Color Sequential Liquid Crystal Display,FSC-LCD)也將更有機會成為下一個世代的主流顯示器產品,但其背光源的設置以及液晶響應速度仍為顯示器的首要問題。
為了使液晶盒得到更高的穿透率以及更短的響應時間,本論文提出針對有快速響應時間的垂直配向邊緣場場效驅動(Vertically Aligned Fringe Field Switching , VA-FFS)的結構進行模擬研究。吳思聰老師和蔡永傑博士曾提出雙邊結構(VA-DFFS)能使液晶盒在不用很薄的情況下,穿透率可以達到90 %且響應時間可以在1 ms內,但由於製程錯位的因素,將導致嚴重影響電光曲線。而本實驗室研究之三維電極設計,藉由只做單邊電極、並且使液晶分子旋轉區域由兩個方向變為四個方向,減少Y方向的向錯線,穿透率可以提升至66 %,並且響應時間也會比相同尺寸下的二維結構更快,但在製程考量上要將各畫素電極串接施予相同電壓,將會提升製程難度,所以在本論文中提出新的三維電極結構來解決以上這些問題。 在本論文中,我們將分別討論三種不同電極形狀之液晶盒特性,其中包含:基本方型電極、六角形電極和圓形,並且發現當電極寬度增加時,操作電壓及穿透率皆會下降,且過飽和的情況變為嚴重,影響電光曲線和響應時間;當電極開口變大時,穿透率會上升,但響應時間由於需轉動的液晶分子區域增加,而導致有變慢的趨勢。因此,在新的三維結構中,穿透率和響應時間之間必須有所取捨以達成最高效率。 最後,利用三階電極並採用創新的三維電極之設計,希望能維持原本的響應時間,同時可以提高穿透率。在模擬分析結果中,三階電極應用於六角形電極開口和圓形電極開口都有良好的穿透率提升,尤其六角形開口之結構,穿透率都達到70 %以上,從模擬結果發現在原本大的電極開口尺寸,響應時間會稍微變長,但還是符合我們預期利用於場色序式顯示器的門檻。 | zh_TW |
dc.description.abstract | With the rapid progress of modern technology, Liquid crystal display (LCD) become an inevitable product. Also, as LED industry are getting more mature, the field sequential color display has higher opportunities to become the mainstream display product of next generation. However, there are some issues. The process difficulties of back light and the faster response LC cell are the obstacle for field sequential techniques application.
In order to obtain higher transmittance and faster response time of LC cell, we focus on simulation of vertically-aligned fringe field switching (VA-FFS) mode with fast response time. Although bilateral VA-FFS mode which proposed by Prof S.T Wu and Dr. Choi can achieve the transmittance up to 90 % and submillisecond response time without thin cell gap, there is a mismatch problem in the process which will affect the electro-optic curve seriously. Moreover, our lab previously propose three-dimension vertically- aligned fringe field switching (3D VA-FFS) mode which makes LC molecules four directions rotated domain rather than initial two directions by patterned new pixel electrode on one side plate. In this way, the disclinations in the Y direction decreases and the transmittance of our new design will enhance up to 66 % and the response time will become faster than 2D VA-FFS in the same size. However, there is still a process problem that we need to drive all electrode by the same voltage. Therefore, we propose the new 3D VA-FFS mode to solve this problem. In this thesis, we design different geometry of sizes and apertures, including square electrode aperture, hexagonal and round shape to discuss its property individually. According to the simulation results, while electrode width is increasing, the operation voltage will decrease and the phenomenon of over saturation becomes seriously, which will affect electro-optic curve and response time significantly. Therefore, the transmittance will also decrease in the larger electrode width structure. To solve this issue, we can increase the area of electrode aperture to enhance the transmittance. However, with the area of electrode aperture becomes larger, the response time will become slower because of larger size of LC rotation domain. With simulation results mention above, we realized that response time and the transmittance cannot be enhanced simultaneously. At the end, we use three level electrode application in new 3D VA-FFS, expecting the structure could maintain the response time while enhance the transmittance. According to the simulation results, we find that the new application can optimize the transmittance in all inverse three-dimension structure. Moreover, the transmittance can be optimized most in hexagonal aperture, which can achieve 70% in all our simulation results. Although the response time is slower in large pixel electrode aperture, it can meet the requirement for the threshold in field sequential color display application. | en |
dc.description.provenance | Made available in DSpace on 2021-07-10T22:16:36Z (GMT). No. of bitstreams: 1 ntu-106-R04941094-1.pdf: 7626339 bytes, checksum: 825bef033826c79b42d9c35959b5b551 (MD5) Previous issue date: 2017 | en |
dc.description.tableofcontents | 致謝 i
中文摘要 ii ABSTRACT iii 目錄 v 圖目錄 viii 表目錄 xiii 第一章 簡介 1 1.1 研究背景 1 1.2 何謂液晶 1 1.3 液晶分類 2 1.3.1 向列型液晶 2 1.3.2 層列型液晶 3 1.3.3 膽固醇型液晶 3 1.4 液晶物理特性 4 1.4.1 雙折射性 4 1.4.2 介電常數各向異性 5 1.4.3 液晶分子排列的秩序參數 6 1.4.4 液晶連續彈性體理論 6 1.4.5 響應時間 7 1.5 液晶模擬軟體TechWiz LCD 3D簡介 8 1.6 場色序式液晶顯示器 9 第二章 文獻回顧及研究動機 11 2.1 液晶顯示器的發展 11 2.1.1 液晶顯示器結構 11 2.1.2 液晶顯示器的技術發展 11 2.2 液晶顯示器驅動模式 12 2.2.1 液晶分子配向 12 2.2.2 平面驅動顯示技術 13 2.2.3 邊緣場效驅動顯示技術 14 2.3 快速響應時間液晶顯示技術 15 2.3.1 過調驅動 15 2.3.2 垂直配向邊緣場效驅動 15 2.3.3 垂直配向雙邊邊緣場效驅動 17 2.3.4 三維垂直邊緣場效驅動 18 2.4 研究動機 19 第三章 TechWiz 3D模擬參數及電極設計 20 3.1 TechWiz 3D LCD軟體參數設定 20 3.1.1 材料庫模組 20 3.1.2 模擬網格切割 21 3.1.3 液晶分析 22 3.1.4 光學分析 24 3.2 二維垂直配向邊緣場效驅動 25 3.3 三維垂直配向邊緣場效驅動 26 3.4 反三維垂直配向邊緣場效驅動 27 3.4.1 正方形電極開口 28 3.4.2 圓形電極開口 28 3.4.3 六角形電極開口 29 3.5 三階電極應用於反三維垂直配向邊緣場效驅動 30 第四章 模擬結果與討論 31 4.1 探討二維與反三維之電光曲線 34 4.1.1 電極寬度對結構穿透率與電壓影響 34 4.1.2 不同電極間距對結構穿透率與電壓影響 41 4.1.3 二維與反三維結構之最大穿透率與操作電壓比較 46 4.1.4 其他電極開口圖形之電光曲線 48 4.1.5 最大穿透率與操作電壓總結 54 4.2 探討二維和反三維之響應時間 55 4.2.1 不同電極寬度對響應時間之影響 55 4.2.2 不同電極間距對響應時間之影響 60 4.2.3 二維與反三維結構之響應時間比較 64 4.2.4 其他電極開口圖形之響應時間 66 4.2.5 響應時間總結 70 4.3 三階電極應用於反三維結構 72 4.3.1 電壓設定與模擬方法 72 4.3.2 三階電極應用於反三維結構之電光曲線 75 4.3.3 三階電極應用於反三維結構之響應時間 82 第五章 結論與未來目標 84 參考文獻 86 | |
dc.language.iso | zh-TW | |
dc.title | 新型電極結構的快速垂直邊緣場效驅動液晶顯示器模擬研究 | zh_TW |
dc.title | Simulation in New Electrode Designs for Fast Response Vertically-Aligned Fringe-Field-Switching Liquid Crystal Displays | en |
dc.type | Thesis | |
dc.date.schoolyear | 105-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林晃巖(Hoang-Yan Lin),黃定洧(Ding-wei Huang) | |
dc.subject.keyword | 快速響應時間,三維電極結構,三維垂直配向邊緣場效驅動,三階電極結構,色序式顯示器, | zh_TW |
dc.subject.keyword | Fast response time,Three-dimensional electrode,Three-dimensional vertically aligned fringe field switching,Three level electrode,Color sequential display, | en |
dc.relation.page | 88 | |
dc.identifier.doi | 10.6342/NTU201703359 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2017-08-16 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 光電工程學研究所 | zh_TW |
顯示於系所單位: | 光電工程學研究所 |
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