鐵電型液晶(Half-V)配向與光電特性研究; Ferroelectric Liquid Crystal(Half-V) Alignment and Electro-optics Characteristic

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/6754

Title:	鐵電型液晶(Half-V)配向與光電特性研究;Ferroelectric Liquid Crystal(Half-V) Alignment and Electro-optics Characteristic
Authors:	黃雪瑛;Hsueh-Ying Huang
Contributors:	光電科學研究所
Keywords:	鐵電型液晶;配向;缺陷;Ferroelectric;Alignment;Defect
Date:	2003-05-29
Issue Date:	2009-09-22 10:27:37 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	摘要目前大多數的液晶顯示器，是以絲狀行液晶材料為主體，但其反應時間的極限未能因應資訊發展的需求，因此鐵電型液晶材料快速顯示的特性越具重要性。鐵電型液晶發展至今，從最早的SSFLC開始，其快速的反應時間，大大提高鐵電型液晶的運用價值，但缺點是無法控制連續灰階，因此只能顯示單色；後來V型液晶材料的出現，改善了這個問題，並且可以連續切換灰階，反應時間快達100μsecs，但可惜的是卻有電場反轉(field reversal)的問題，原因在於其自發性極化強度值太大所致。現在，Half-V液晶材料的出現解決了以上的問題，其快速的反應時間、自發性極化強度值小以及可以連續控制灰階的特性，為鐵電型液晶顯示器領域帶來新的驅動模式。Half-V鐵電型液晶材料，在配向上不易控制，故要得到單一(monodomain)的均勻區塊，則需要外加場的誘導，一般大多以外加電場，做為配向上的誘導因素，而我們提出了替代電場誘導的方法，進而研究、分析其相關的光電量測。 The surface-stabilized ferroelectric liquid crystal (SSFLC) is well known to have the fast-response LC mode. However, it is very difficult to control a continuous gray scale. On the other hand, the antiferroelectric liquid crystal (AFLC) showing thresholdless V-shaped switching characteristics is proposed to have the fast-response LC mode and a continuous gray scale. Although its response time is intrinsically as short as around 100μs,it was reported that switching time of the TFT panel was more than 50ms.This phenomenon may be attributed to its large spontaneous polarization(Ps).In order to satisfy all conditions for realizing a fast response, gray-scale control and small Ps, a novel FLC mode be proposed, which we call the half V-shaped switching.
Appears in Collections:	[Graduate Institute of Optics and Photonics] Electronic Thesis & Dissertation

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