現今由於液晶在光學元件的應用廣泛，在顯示器的運用更是蓬勃發展，但其使用的向列型液晶多半有反應時間的問題，在高畫質的顯示上是一道障礙。SSFLC（Surface Stabilized Ferroelectric Liquid Crystal）為一薄型的器件，其快速反應時間與雙穩定性可應用在顯示元件上，但是在配向上一直存在著zigzag缺陷的問題。缺陷的存在會降低對比度及造成畫面的閃爍，這對高畫質的顯示來說是很大的問題。
本論文主要在探討PI膜的表面特性對於SSFLC器件中zigzag缺陷的影響。實驗上，利用一高預傾角的配向膜以不同的摩擦強度製作SSFLC device。我們製作出了zigzag free的樣品，證實較小的摩擦強度對鐵電液晶有比較少的zigzag缺陷。另外表面的平整度較平滑會造成較少的缺陷也在本文討論。我們利用摩擦強度與表面能的關係，說明表面能的極性部份對鐵電液晶的配向佔很重要的角色。

Nowadays liquid crystals have widely used for optical devices, even are attractive in display. But a major problem for nematic phase is its long response time, which hinders the phase to be used in high quality displays. Surface Stabilized Ferroelectric Liquid Crystal（SSFLC）is a thin device which has fast response time and exhibits excellent bistability. It can be applied in display. But it is difficult for SSFLC to achieve alignment without zigzag defects. This defect will reduce contrast ratio of display and cause image irregularities and flickering.
This article discusses zigzag defects in SSFLC device. In experiment, we use convenient rubbing method to alignment FLC with high pre-tilt PI film. And we investigate the surface properties of polyimide (PI) films rubbed with different rubbing strength. We fabricate the SSFLCs without zigzag defects, and confirm that the great rubbing strength produce more zigzag defects for FLC alignment. In addition, we discuss the topography of smooth surface results in fewer defects. Finally, with the relationship between surface energy and different rubbing strength in PI film, we show the polarity of surface energy is a important role for FLC alignment.

目錄

中文摘要 Ⅰ
英文摘要 Ⅱ
誌謝 Ⅳ
目錄 Ⅴ
圖目錄 Ⅸ
表目錄 XI

第一章、緒論 1

第二章、液晶相關理論 3
2-1 液晶態 3
2-2 液晶分類 4
2-2.1 Nematic Phase 5
2-2.2 Chiral Nematic ( N* ) Phase 5
2-2.3 Smactic Phase 6
2-3 液晶的物性 11
2-3.1 秩序參數 11
2-3.2 光學雙折射 11
2-3.3 介電異向性 12
2-3.4 彈性係數 13

第三章、表面穩定鐵電液晶Surface-Stabilized Ferroelectric Liquid Crystals ( SSFLCs )
15
3-1 Introduction 15
3-2 表面穩定鐵電性液晶(Surface Stabilized Ferroelectric Liquid Crystal ) 16
3-2.1 SSFLC(Surface Stabilized Ferroelectric Liquid
Crystal) 16
3-2.2 Operation Of SSFLC Device 17
3-3 zigzag缺陷 19
3-3.1 Chevron Structure 19
3-3.2 Alignment Of zigzag Defect-Free 21
3-4 SSFLC 優缺點 23


第四章、系統量測與樣品製作 26
4-1 系統量測 26
4-1.1 熱台偏光顯微鏡 26
4-1.2 表面張力分析儀 28
4-1.3 預傾角量測系統 32
4-2 SSFLC樣品製作 36
4-2.1 PI配向膜製備 36
4-2.2 SSFLC cell 38

第五章、 結果與討論 40
5-1 zigzag缺陷觀察 40
5-2 預傾角與缺陷 45
5-3 摩擦配向與缺陷 47
5-3.1 摩擦強度影響缺陷 47
5-3.2 表面平整度與缺陷 48
5-4 表面能分析 50
5-4.1 表面極性與鐵電液晶配向 50
5-4.2 摩擦配向與極性 50

第六章、 結論 55

參考文獻 57

附錄 62

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