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    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/7312


    題名: 非接觸式無機液晶配向與混合型液晶元件之 光電性質研究;LC alignment using noncontact inorganic and the electro-optic charasterics of hybrid LC cell
    作者: 劉勝發;Shen-Fa Liu
    貢獻者: 物理研究所
    關鍵詞: 非接觸式;無機被向;混合型;液晶;SiO2;liquid crystal;aligned;inorganic hybrid
    日期: 2003-07-04
    上傳時間: 2009-09-22 10:54:59 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 以非接觸式無機液晶配向的方式濺鍍SiO2垂直配向膜,雖然可以避免經由磨擦配向膜產生的問題與保有垂直配向模式貫有的高對比度優勢,但由於垂直配向模式的液晶晶胞在水平方向上的配向力較薄弱,因此易造成晶胞內部液晶分子的流動效應,使得垂直配向模式之液晶晶胞的上升反應時間過長。我們藉由摩擦SiO2垂直配向膜的方式,量測與觀察經由磨擦的方式對於液晶分子的反應時間與流動效應的改進,並比較磨擦SiO2垂直配向膜對於其配向能力如預傾角與其polar anchoring energy之影響等。由實驗結果發現磨擦SiO2垂直配向膜對於垂直配向模式中的上升反應時間有大幅地改善,因此推論其azimuthal anchoring energy也增強。此外由預傾角與polar anchoring energy的實驗結果推論SiO2 經由摩擦之後, SiO2 表面分子之結構改變了,進而使得polar anchoring energy變小,並改變了其dipole之方向,因此使液晶分子之預傾角變小。 另外,我們以平面電極提供側向電壓的方式驅動注入負型液晶材料的混合型液晶晶胞,量測其光電特性,實驗結果發現此種模式在作為反射式的液晶晶胞時,具有廣視角的特性。 Although we can avoid the problems caused by the rubbibg process and preserve the high contrast ratio advantage using non-contact inorganic LC alignment, SiO2 VA film, deposied by sputtering technique, the azimuthal anchoring energy of LC cell in VA mode is usually weak resulting to the flow effect in the LC cell, which makes the raise time long. By rubbing SiO2 film, we observed the improvement of raise time and flow effect, and compared the influence on its aligning ability such as pretilt angle and polar anchoring energy. The empirical results show that there is enormous improvement in raise time, we therefore inferred that the azimuthal energy was also enforced.Furthermore, the empirical results also suggest that the surface molecular structure of SiO2 had changed to lower the polar anchoring energy and change the dipole orientation , which reduced the pretilt angle. Besides, we drive hybrid alignment LC cell by applying lateral electric field, and measure electro-optical characteristics. The results show that reflective mode of hybrid LC cell has wide-viewing angle.
    顯示於類別:[物理研究所] 博碩士論文

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