摩刷配向與紫外光配向之聚亞醯胺薄膜其相位延遲研究及與表面定向強度之關係

Abstract

液晶配向膜與液晶顯示器中的參數如定向強度有著密不可分的關係。因此配向膜特性的了解在液晶顯示器參數的研究上有很大的幫助。聚亞醯胺薄膜在經過摩刷配向以及紫外光照射配向之後，薄膜分子會產生異方性。分子的異方性便會使光的相位產生延遲。在本論文之工作中改變各種不同配向條件，觀察配向膜的相位延遲變化。薩納曼特橢圓儀是一個可以精準量測相位延遲的方法，我們利用此橢圓儀來量測我們配向膜的相位延遲。此外我們對於液晶表面定向強度與配向膜的相位延遲的關係做討論，驗證只有配向膜表面分子的異方性對於液晶表面定向強度有影響。我們亦將薩納曼特橢圓儀應用在量測液晶盒的相位延遲中。

There are relationship between liquid crystal alignment films and the parameters of liquid crystal display. Therefore the well know of liquid crystal alignment films support studies of the parameter of liquid crystal display. After rubbing or photo-irradiation, the molecular of polyimide alignment films will be aligned and have optical anisotropy. Optical retardation of polyimide films are then induced. We change the conditions of alignment process and measure the induced optical retardation. A sensitive method for measuring optical retardation, the Senarmont Ellipsometry, is used to determine the optical retardation of our alignment films. Then we discuss the relationship between the optical retardation of alignment films and anchoring strength to the liquid crystal. Our results show that only the optical anisotropy of surface molecule in polyimide films effects the anchoring strength of liquid crystal. In addition, we use the Senarmont Ellipsometry to measure the optical retardation of liquid crystal cell.