摩擦強度對於液晶顯示器的配向膜有著顯著的影響。在本論文中
主要是改變摩擦次數來增強摩擦強度，找出適合垂直配向的摩擦強度。
在本實驗中，主要討論的方向有兩項，第一項是討論極性與液晶分子的關係。主要使用的儀器為接觸角量測系統，量測液滴與基板的接觸角，計算極性，離散以及表面能。第二項是摩擦強度的改變對液晶盒光電特性的影響。將不同摩擦強度的基板組裝成液晶盒，利用光電量測系統對其作分析。主要分析有光學圖像觀察、穿透率
(Transmittance)、對比度(Contrast Ratio)，以及鮮銳度(Sharpness)。
隨著摩擦強度的增加，基板極性也會增加。而極性的變化，對液晶分子的預傾角產生了影響。由於液晶分子預傾角的改變，使得液晶盒光學特性同樣的產生了改變，像穿透率以及對比度，或者是影響畫面品質的鮮銳度。

The liquid crystal display on the liquid crystal alignment is known to be influenced by the rubbing strength. In the thesis, in order to figure out the best condition for homeotropic alignment, we add the number of rubbing, which causes the increase of the rubbing strength.
In the experiment, we discuss two parts. The first part discusses the relation between polarity and liquid crystal. The instrument used mainly is contact angle measurement system, which measures the contact angle between liquid and sample and calculates the polarity, the dispersion and the surface free energy. In the second part, we change the rubbing strength to analyze the influence of liquid crystal cell. Also, we use the electro-optical measurement to analyze the cell which is fabricated by different rubbing strength. It is at this part that we focus on analyzing the optical texture, transmittance, contract ratio, and sharpness.
The sample’s polarity rises as the rubbing strength increases. It is the influence of the liquid crystal pretitle angles that the polarity as well as the liquid crystal cell’s optical property changes. Such changes could be seen in transmittance, contract ratio and sharpness

摘要 Ⅰ
致謝 Ⅲ
第一章 序論 1
第二章 液晶的材料種類及其物性 2
2-1 液晶材料的種類 2
2-2 液晶材料的物性 10
第三章 相關機制與理論 15
3-1 摩擦配向 15
3-1-1 摩擦理論 15
3-1-2 摩擦強度定義 16
3-2 預傾角 17
3-3 接觸角與表面能 20
3-4 VA顯示之原理 22
第四章 實驗儀器及架構 25
4-1 材料介紹 25
4-2 實驗裝置 26
4-2-1 摩擦配向機 27
4-2-2 表面張力分析儀 27
4-2-3 熱台偏光顯微鏡 29
4-2-4 光電量測系統 30
4-3 樣品製作 32
第五章 實驗結果與討論 34
5-1 表面能與預傾角的關係 34
5-1-1 水平配向膜與垂直配向膜表面能之比較 34
5-1-2 摩擦強度與表面極性及預傾角的相互關係 35
5-2 光電量測 38
5-2-1 摩擦配向的重要性 38
5-2-2 電壓與穿透度的關係 42
5-2-3 對比度的影響 46
5-2-4 預傾角與鮮銳度的影響 48
第六章 結論 50
參考文獻 51

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