本研究目的為發展擬PI垂直配向共聚薄膜，為非接觸光配向方式之液晶元件。利用液晶/壓克力單體之相分離技術，將具有負誘電異方性液晶、烷基長碳鏈壓克力單體、兩種不同長度的雙酚主鏈型壓克力單體與光起始劑以適當比例摻混；經由紫外光(Ultra-Violet, UV)照射後，因相分離而形成雙層垂直配向共聚薄膜。而針對不同長度的主鏈型壓克力單體結構及不同試片厚度對於液晶分子在此垂直配向模式下之光穿透度、對比度以及反應時間等光電特性探討。由此實驗結果發現改變不同長度的主鏈型壓克力單體可以改善液晶元件的光電性質，並且在適當比例之液晶摻混系統下其對比度可達2028:1。而此新穎垂直配向技術於液晶顯示器工業可縮短傳統配向技術之聚醯亞胺(Polyimide, PI)段前製程，並期望利用此光配向方式製作具有傑出的光電特性且低價化之液晶元件。

The purpose of this study is to develop a pseudo-PI vertical alignment (VA) copolymer films which is non-contact photoalignment method for liquid crystal (LC) devices. We used the LC/photocurable monomer phase separation technique and mixed negative dielectric anisotropy (N-type) LC, alkyl long carbon chain acrylic monomer, two kinds of the different length for biphenol main chain type acrylic monomer and a photoinitiator were mixed in the proper ratio; Only Ultra-Violet (UV) light irradiation was required to aid the phase separation of the LC mixture system to form the double layers of a VA copolymer film. As for the different length main chain type acrylic monomers structure for the LC molecules and the different cell gap under the VA mode, such as optical transmittance, contrast ratio and response time etc., have been characterized. The result of this experiment was discovered change in the different length main chain type acrylic monomers can improve the electro-optical properties of LC devices and under the proper ratio LC mixture system, the contrast ratio reaching 2028:1. This novel VA technology for the liquid crystal displays (LCDs) industry enables the shortening of Polyimide (PI) pre-processing and we hope to use the photoalignment technique to manufacture excellence electro-optical characteristics and low cost of the LC devices.

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