新型高分子牆製程技術在鐵電式液晶顯示器之設計與應用

Abstract

傳統液晶顯示器因其輕薄短小的特性非常適合於攜帶型顯示器的應用，近年來更邁入大尺寸家用型電視市場。但是其動態顯示品質受限於液晶的反應速度而降低其應用性。為了有效提升其動態品質，擁有高速反應的鐵電式液晶技術受到顯示業界的高度矚目，若關鍵性的鐵電式液晶配向問題能夠被解決，便能為顯示產業帶來一波革命性的進步。以高分子材料建構成的液晶顯示器被証實能夠解決其配向問題的方法之一，而有鑑於傳統高分子牆的製程方法仍有許多缺點，在此我們提出一種新型的高分子牆製程技術應用於鐵電式液晶顯示器，可以有效地提升高分子牆的品質及縮短製程的時間及複雜度，使得高分子牆能夠更實際地被應用於顯示器產業。 此新型製程技術是利用外加電場來達到液晶與高分子單體的有效分離，再利用紫外光照射使單體產生高分子光聚合反應進而固化高分子牆結構。相較於傳統製程，本研究方法不但可以減少高分子單體殘留在顯示畫素之中的比例，更能提升顯示器的對比度及亮度，而更完整的高分子牆結構可以加強顯示元件的機械性質，使之應用於可撓式顯示器的潛能大幅提升。

Fast switching liquid crystal technique is essential for achieving high dynamic display quality in current LCDs. Ferroelectric liquid crystal (FLC) is a well known material which has fast response time, but suffers an alignment problem. Recently, the polymer wall and network structures were studied in order to eliminate the alignment problem in FLC device. Besides, polymer walls can be applied to a flexible display. In this thesis, a novel process was studied to fabricate polymer walls in FLC devices by applying an electric field. In the proposed fabrication process, the phase separation between FLC and acrylate-based monomers was induced in the specific electric field. With this process, phase separation can be induced and polymer walls can be fabricated without a photomask. Besides, shorter process time and simpler steps of this method will promote the possibility of applications in display industry.