具有高正双折射率液晶聚合物薄膜的制备及作为液晶显示器相位补偿膜的应用研究

主流IPS液晶显示器(LCD)的显示层具有负双折射性质，影响产品的显示效果。目前改善这一缺陷的主要手段是应用具有高正双折射值(Δn)的补偿膜抵消负的相位变化。但已商业应用的正补偿材料大都需要非常昂贵的后处理过程。本项目通过设计与制备系列具有高正Δn的甲壳型液晶聚合物薄膜，旨在弥补现有相位补偿膜后处理昂贵的应用缺陷。首先合成两种系列侧基含有萘环、双炔基和异硫氰酸基（-NCS）共轭结构的丙烯酸酯类单体，随后采用均聚及与甲基丙烯酸甲酯（MMA）共聚的方法制备相应的甲壳型液晶聚合物，再通过简单的溶剂挥发法得到具有高正Δn的聚合物薄膜，系统研究膜结构与Δn值之间的关系及变化规律，探讨其作为液晶显示相位补偿膜的应用潜质。本研究不仅为设计合成新型显示相位补偿膜提供了新的设计思路，且对该类液晶显示相位补偿膜的商品化应用提供理论依据，有助于IPS液晶显示器成本的下降和显示效果的增强。

The display layer in the main stream IPS liquid crystal display (LCD) has the property of negative birefringence, which affects the display effect. At present, the main method to reduce the disadvantage is applying the display compensation film with the high positive birefringence(Δn) to counteract the negative phase change. However, the costly aftertreatment process is necessary for these display compensation film with the high positive birefringence in commercial fields. In this work，a series of mesogen-jacketed liquid crystal polymer films with the high positive Δn will be designed and synthesized to make up the defect of expensive aftertreatment for the existing display compensation in application. At first, two series of acrylate monomers containing naphthalene, diacetylene, and isothiocyanate(-NCS) group with conjugated structure are synthesized. Then, two kinds of mesogen-jacketed liquid crystal polymers are synthesized through homopolymerization of monomer and copolymerization with methyl methacrylate(MMA). The polymer films with the high positive Δn are obtained through simple solvent evaporation method. The relationship between the film structure and Δn, and the change regulation will be studied in a systematic way in order to discuss the application of potential of films for the display compensation. The study can not only offer a new thinking for designing and synthesizing novel liquid crystal display compensation film,but also afford the theory evidence for the commercialization of these films, which will be advantaged for cost reduction of IPS LCD and improving of screen display quality.