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, PDLC）的视角切换型（Viewing-Angle-Switching, VAS）薄膜，并对其光学性能展开了研究。该类基于PDLC的VAS薄膜可表现出电可控的视角切换特性：无外加电场时薄膜呈现窄视角，施加24V电场时则展现宽视角。此外，搭载该PDLC基VAS薄膜的智能防窥液晶显示器（Liquid Crystal Display, LCD）同样表现出电可控视角切换性能，本文还对其相应的作用机制进行了探讨。实验结果证实，所制备的VAS薄膜兼具防窥效果与电可控视角切换性能，在智能光学薄膜及新型信息显示领域具备潜在应用前景。