配向層表面極性對FLC排列之影響

Abstract

鐵電型液晶具有快速反應的特性，使得其成為下一世代高品質顯示器的候選人之一。然而不易達成良好排列特性阻礙了在商業上的量產。在本文中，我們從基本原理上來探討表面穩定鐵電型液晶的主要排列缺陷之一形成的原因和解決方案：Horizontal Defect。

我們提出利用上下層具有不同極性的配向材料，將能有效的消除Horizontal Defect；因此HMDS和Nylon 6兩種具有正極性材料以及PI具有負極性的材料使用來做成Hybrid Cell。從結果中發現此兩種配向材料在鐵電性液晶中可以成功壓抑Horizontal Defect形成，使得整體排列缺陷減少，進而提高顯示器對比，解決鐵電型液晶排列的問題。

A method solving horizontal defect of FLCs was proposed based on elastic-continuum theory. According to the theory, FLCs of the uniform state in the cell had two stable states (azimuthal angle 讧=0 or 钉) which possessed the same minimum free energy and horizontal defect would always appear. Only one stable state had the minimum free energy so that horizontal defect no more observed in the cell, by using hybrid cell configurations which adopted two different alignment layers with opposite polarity,

Our results showed that horizontal defect-free state was successfully achieved by using three different kinds of hybrid cells. Our breakthrough produced satisfied dark state, solved the alignment problem of FLCs and made FLCs application in displays become hopeful.