聚合物网络稳定液晶的电光偏振片

An Optoelectric Polarizer by Polymer Network Stabilized Liquid Crystals

制备了一种散射偏振片。它是由非晶态单体形成的聚合物网络、向列液晶和涂有聚酰亚胺的 ITO玻璃基板组成。聚酰亚胺被反向平行摩擦 ,液晶分子则沿摩擦方向取向 ,并被单体形成的网络所稳定。根据聚合物网络液晶的电光特性可知 ,入射偏振光束被散射或透射相应地取决于其偏振方向平行还是垂直于基板的摩擦方向。平行时 ,光的散射强度通过电场可被强烈地调节 ;垂直时 ,光的透过率很高 ,几乎不依赖施加的电场。这种偏振器件具有低的驱动电压 ,它和一个常规的线性偏振片相结合 ,可获得高对比度的显示效果。本文给出了样品的制作过程及电光测试结果 ,并对结果进行了分析讨论。

A scattering polarizer is prepared by using polymer networks formed from an amorphous monomer, nematic liquid crystals and polyimide coated ITO glass substrates. The polyimide layers are rubbed with anti parallel directions, thus liquid crystal molecules with homogeneous alignment along the direction of rubbing can be obtained, and further stabilized by polymer networks. Due to electro optical properties of polymer network liquid crystals, and impinging polarized beam is scattered or transmitted depending on its polarization direction parallel or perpendicular to that of rubbing, respectively. In the parallel case, light scattering intensity can be adjusted greatly under low electric field; in the perpendicular case, light transmission is very high and hardly adjusted electrically. This kind of device combining with a linear polarizer can be switched in a high contrast ratio and fast response. The detail fabrication process is presented, and the experimental results are given and discussed.