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標題: | 新型電極結構應用於低電壓高穿透率藍相液晶顯示器之研究 The Study of New Electrode Structure Applying to Low Voltage and High Transmittance Blue Phase Liquid Crystal Display |
作者: | Pan Li 李盼 |
指導教授: | 蔡永傑(Wing-Kit Choi) |
關鍵字: | 藍相液晶,TechWiz,凸起物,浮接電極,埋入式牆形電極, Blue phase liquid crystal,TechWiz,Protrusion,Floating electrode,Embedded wall-shaped electrode, |
出版年 : | 2016 |
學位: | 碩士 |
摘要: | 自液晶應用於顯示器以來,廣泛的出現在我們生活周遭,如液晶電視、平板電腦、智慧型手機及大型廣告面板等,極大的優化了資訊呈現的方式。傳統的液晶顯示器雖然有很多優點但響應時間慢,很難滿足人們對大容量高幀頻顯示器的要求。近幾年研究人員研發出一種新型的液晶材料藍相液晶(BPLC),存在於向列相與各向同性相之間。藍相液晶顯示器因具有工藝簡單、高對比、寬視角和快速響應等優點被廣大學者爭相研究。但是,驅動電壓高和穿透率低等問題,為制約藍相液晶顯示器商業化生產的主要瓶頸。
本論文使用TechWiz模擬軟體來設計基於三角形凸起物的三種電極結構來改善藍相液晶顯示器的操作電壓和穿透率。第一種電極結構將增強型梯形電極結構改成等腰三角形單側電極結構,通過優化等腰三角形凸起物的間距可以得到更高的穿透率以及更低的操作電壓;第二種電極結構在第一種電極結構基礎上將等腰三角形凸起物改成直角三角形凸起物,並探討了只在斜邊有電極和斜邊與直角邊都有電極的情況,比較了不同盒間隙的電壓-穿透率曲線,結果兩邊都有電極會有更高的穿透率。接著探討在有浮接電極情形下將直角三角形電極結構取代反正弦和反橢圓形狀電極結構,穿透率和操作電壓有改善;第三種電極結構是埋入式牆形電極結構,由於之前電極結構的不對稱需要調節兩種凸起物間距,且不同區域穿透率不能同時達到最大值。埋入式電極結構由於電極是牆形,所以產生的電場非常水平;由於結構是對稱形狀,所以只需要調節一種凸起物間距,不同區域的穿透率可以同時到達最大值,穿透率高達約95%,進一步減小凸起物寬度,可以減小操作電壓,有很大的改善。 Since the liquid crystal was applied for monitors, it has been widespread in our daily life, such as LCD TV, Tablet PC, smartphone and large advertising panels, which has greatly optimized the way of presenting information. Although the conventional liquid crystal displays have many advantages, they have slow response time, which is difficult to meet people’s requirements for the large capacity and high frame rate displays. In recent years, researchers have developed a new type of liquid crystal material called blue phase liquid crystal(BPLC), and it exists between chiral nematic phase and isotropic phase. Many scholars are eager to study blue phase liquid crystal display because of its simple process, high contrast, wide viewing angle and fast response, etc. However, the high driving voltage and low transmittance for the blue phase liquid crystal display are major bottlenecks to restrict for its commercial production. In this thesis we use the simulation software (TechWiz) to design three types of electrodes based on triangle protrusion to make the transmittance and operating voltage of blue phase liquid crystal display better. In the first structure we discuss the enhanced trapezoid protrusion structure and design electrode based on one side of isosceles triangle protrusion. By optimizing the protrusion distances we can obtain higher transmittances and lower operating voltages. In the second structure we change the isosceles triangle protrusion into right triangle protrusion and discuss the electrodes only on hypotenuse(one-sided) and on both hypotenuse and right angle side(two-sided).After comparing T-V curves at different cell gaps, we find that the latter structure is better. Then we compare reverse sin (Rev.Sin)shape electrode and reverse elliptic (Rev.Elliptic) shape electrodes with electrodes based on right triangle protrusion(two-sided),and the three shapes all combine with floating electrodes. The results show that electrodes based on right triangle protrusion(two-sided) have higher transmittances and lower operating voltages. The third electrode structures are embedded wall-shaped electrode structures. The previous electrode structures are unsymmetrical so we need to adjust two types of protrusion distances, and their transmittances at different regions cannot get the maximum at the same voltage. Embedded wall-shaped electrode structures can generate strong horizontal electric field, and we need to adjust only one type of protrusion distance. This structure's transmittances at different regions can get the maximum at the same voltage, and the transmittance is about 95%.Then we reduce protrusion width and the operating voltages are lower. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76695 |
DOI: | 10.6342/NTU201602562 |
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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ntu-105-R03941106-1.pdf 目前未授權公開取用 | 7.69 MB | Adobe PDF |
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