Hybrid-Aligned Liquid Crystal Polymers Adhered to the Polarizing Film or Doped with Dichroic Dye for Display Privacy Protection,ACS Applied Polymer Materials

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Hybrid-Aligned Liquid Crystal Polymers Adhered to the Polarizing Film or Doped with Dichroic Dye for Display Privacy Protection
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-12-27 , DOI: 10.1021/acsapm.3c02520
Dekang Guo ₁ , Shuo Chen ₁ , Xiaoyang Cong ₁ , Qingyan Fan ₁ , Chunfeng Song ₁ , Jinbao Guo ₁

Affiliation

With the widespread use of electronic display devices such as smartphones and tablets, the demand for privacy protection has been steadily increasing. While the traditional shutter privacy films offer a decent antipeeping effect, they suffer from thickness, high costs, and poor front-facing transparency, affecting the user experience. To solve this problem, and also based on the facts that the linearly polarized light (LPL) emitted by displays and the angular dependence of hybrid-aligned liquid crystal (LC) for LPL, for the first time, here we develop the optical composite films for display antipeeping application based on a polarization-dependent strategy. By combining a hybrid-aligned LC polymer (HLCP) film with a polarizing film (PF), the flexible composite film exhibits excellent narrow viewing angle capability while maintaining high front-facing transmittance, minimizing backlight loss. Furthermore, to achieve a polarizer-free system, we prepared the dichroic dye-doped HLCP film and transferred the consequent film onto optical clear adhesive (OCA). The experimental results confirm that this composite film also exhibits a narrow viewing angle property, which offers an approach for the study of display viewing angle control. These two polarized optical composite films based on HLCP have the potential for practical antipeeping applications in current mainstream display devices.

中文翻译：

混合配向液晶聚合物粘附在偏光膜上或掺杂二向色染料以保护显示器隐私

随着智能手机、平板电脑等电子显示设备的广泛使用，隐私保护的需求不断增长。传统的快门防窥膜虽然防窥效果不错，但厚度大、成本高、正面透明度差，影响用户体验。为了解决这个问题，并基于显示器发出的线偏振光（LPL）和混合取向液晶（LC）对LPL的角度依赖性的事实，我们首次开发了光学复合薄膜用于基于偏振相关策略的显示器防窥应用。通过将混合取向液晶聚合物（HLCP）薄膜与偏光薄膜（PF）相结合，柔性复合薄膜表现出优异的窄视角能力，同时保持高正面透过率，最大限度地减少背光损失。此外，为了实现无偏光镜系统，我们制备了二向色染料掺杂的 HLCP 薄膜，并将所得薄膜转移到光学透明粘合剂 (OCA) 上。实验结果证实该复合薄膜还具有窄视角特性，为显示视角控制的研究提供了一种途径。这两种基于HLCP的偏光光学复合薄膜在当前主流显示设备中具有实际防窥应用的潜力。

更新日期：2023-12-27

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