相分離複合膜於混合配向液晶盒之設計與應用

Abstract

近年來液晶顯示技術發展蓬勃，可撓式顯示器成為熱門的研究，可撓式顯示器具有輕、薄、耐衝擊之特性，比傳統液晶顯示器更適用於可攜式產品，成為許多公司及研究單位的發展重點。 相分離複合膜PSCOF(Phase Separated Composite Film) 主要應用於可撓式軟性顯示器，是由液晶和單體共混物經過相分離後形成的分層光電材料。藉由液晶與聚合物混合比例，得以控制液晶層厚度，並由液晶層的厚度降低，提升液晶反應速度。 典型PSCOF製程是採用NOA 65與E7混合，進行相分離，利用下基板配向膜使液晶層根據rubbing方向排列，故侷限液晶層只有單一方向排列。本文將利用具有排列之光固化單體，於HAN Cell內形成相分離複合膜。由於混合配向液晶盒(HAN Cell)適用於反射模式且具有高反應速度，我們將探討形成複合膜的製程條件與量測液晶盒反射率，並期許將PSCOF結合HAN Cell的優點，應用於反射式液晶顯示器。

Phase separated composite film (PSCOF) was studied for reflective flexible display. It can be prepared by phase separation in the mixtures of liquid crystals and photo-curable monomers. The response time of PSCOF device can be controlled by the cell thickness while adjusting the weight percentage of mixture. Traditional PSCOF was made of E7 and NOA 65. The liquid crystal molecules were aligned with alignment layer following the rubbing direction. The alignment of liquid crystal was uni-direction limited by rubbing process. In this study, vertical aligned photo reactive monomer was used to generate PSCOF in hybrid aligned nematic (HAN) cell. HAN cell is suitable for reflective mode with faster response time in small cell gap. The manufacture process of PSCOF HAN cell and its reflection results were discussed in this thesis.