本論文之研究目的是提出一種液晶預傾角可調變的方法，實驗方法是溶質體積固定下改變兩種溶劑體積的混合比例來達到預傾角的調變，溶質是以兩種矽烷(silane)材料體積比混合，分別是水平配向矽烷MAP (N-methyl-3-aminopropyltrimethpxysilane)和垂直配向矽烷DMOAP (N,N-dimethyl-N-octadecyl-3-amonopropyltrimethoxysilyl chloride)，溶劑是以異丙醇(IPA)和去離子水(DI Water)的體積比混合。調配好的溶液以浸泡方式將矽烷附著於玻璃基板以做成反平行(anti-parallel)液晶樣品，並使用光箱及偏光顯微鏡來觀測樣品配向的結果，此外，以旋轉晶體法量測樣品的預傾角度，及利用電壓-穿透率曲線觀察樣品。實驗結果發現兩種溶劑體積的調變確實可以控制預傾角的變化，但液晶配向的結果隨時間而有變化。

In this thesis, we demonstrate a method that two solvents mixed with various ratios used in blending silanes effects on adjustable pretilt angles of liquid crystal cells for liquid crystal alignment. In our experiment, two kinds of silane are used as a mixed solute. MAP (N-methyl-3-aminopropyltrimethoxysilane) is the first kind of silane for homogenous liquid crystal alignment. DMOAP (N,N-dimethyl-N-octadecyl-3-aminopropyltrimethoxysilyl chloride) is the second kind of silane for homeotropic liquid crystal alignment. The mixed solvent is composed of isopropyl alcohol (IPA) and deionized water (DI Water) with various volume ratios. The completely mixed solution is used to attach silane molecules on glass substrates with dipping coating method. Optical characteristics of liquid crystal cells with anti-parallel are observed with the light box and the polarized microscope. The pretilt angles of cells are measured with the crystal rotation method. Experimental results show that our method is capable of adjusting pertilt angles of liquid crystal cells. But, alignment status in liquid crystal cells seem to continuously change from cell boundary to middle area after a few days.

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