Viewing-angle-switching film based on polymer dispersed liquid crystals for smart anti-peeping liquid crystal display

In this paper, the viewing-angle-switching (VAS) films based on polymer dispersed liquid crystals (PDLCs) were fabricated and the optical properties of the VAS films were studied. The VAS films based on PDLC films can exhibit electrically switchable viewing-angle properties, and the films showed a narrow viewing angle under no electric field and presented a wide viewing angle under electric field (24 V). Furthermore, the smart anti-peeping liquid crystal display (LCD) containing the VAS film based on PDLC film also displayed the electrically switchable viewing-angle performance and the corresponding mechanism was discussed. The results demonstrated both the anti-peeping effect and electrically switchable view-angle effect of the as-fabricated VAS film, promising potential applications in intelligent optical films and novel information displays.

本论文制备了基于聚合物分散液晶（polymer dispersed liquid crystals, PDLCs）的视角切换（viewing-angle-switching, VAS）薄膜，并对该VAS薄膜的光学性能展开了研究。基于PDLC薄膜的VAS薄膜可表现出电控视角切换特性：在无外加电场时呈现窄视角，在施加24 V电场时则展现宽视角。进一步地，搭载该PDLC基VAS薄膜的智能防窥液晶显示器（liquid crystal display, LCD）同样表现出电控视角切换性能，本文还对其相应的作用机制进行了探讨。研究结果证实了所制备的VAS薄膜兼具防窥效果与电控视角切换性能，在智能光学薄膜及新型信息显示领域具备潜在应用价值。