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標題: | 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 Simulation in New Electrode Designs for Fast Response Vertically-Aligned Fringe-Field-Switching Liquid Crystal Displays |
作者: | Bo-Kai Tseng 曾柏凱 |
指導教授: | 蔡永傑(Wing-Kit Choi) |
關鍵字: | 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, Fast response time,Three-dimensional electrode,Three-dimensional vertically aligned fringe field switching,Three level electrode,Color sequential display, |
出版年 : | 2017 |
學位: | 碩士 |
摘要: | 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。 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. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/77698 |
DOI: | 10.6342/NTU201703359 |
全文授權: | 未授權 |
顯示於系所單位: | 光電工程學研究所 |
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