軟性液晶顯示器配向膜及其光電特性影響之研究

Abstract

本計畫提出開發可適用於高階軟性液晶模組的液晶配向膜，針對控制 液晶配向膜及畫素微結構之觀念性構想，建立完整液晶配向膜評估系統的 前瞻技術。研發的重點將利用傳統磨擦配向膜與非接觸式之電漿束配向 製程，建立一套完整的製造及量測技術，以評估不同配向膜材料在處理過 程中對液晶盒之光電特性之影響。計劃中將以穿透式之光學補償彎曲液 晶(OCB)及反射式之膽固醇液晶(CLC)為平台，深入探討不同的配向膜材 料在不同的配向方式處理下，液晶盒光電特性與液晶配向膜之預傾角及表 面錨定能、配向膜表面化學鍵結特性及薄膜光學特性之相關性，並架設二 維陣列光彈性調制(Photoeleastic Modulator)-橢圓儀(Ellipsometer)之量測 原型設備(prototype)。針對液晶盒光電特性的影響，建立一套完整的表面 處理資料庫。期在研發完成後，能提供低溫配向膜製程條件及液晶配向膜 評估系統，藉由適當的管道移轉至產業界，使國內面板廠能應用此技術， 衍生未來具高附加價值的高階軟性液晶顯示器。

The research goal of this project is to develop a novel low temperature alignment process for high-end flexible liquid crystal display applications. The study includes controlling alignment surface, pixel micro-structure design, and alignment evaluation system. Both rubbing and plasma beam alignment processes will be applied and will be evaluated their effectiveness on various alignment materials. The optically compensated bend mode liquid crystal (OCB) and chiral nematic liquid crystals (CLC) will be the vehicles for this study. The surface pretilt angle, surface anchoring energy, surface chemical structures, thin film optical properties will be investigated and compared with their cell electro-optical properties. In order to measure the thin film properties, a prototype of 2D-Photoeleastic Modulator Ellipsometer (2D PEMEllipsometer) will be setup along this research. The data acquired from this homemade instrument will provide valuable process information and will be benefit to the future flexible liquid crystal display manufactures.