Photoalignment of Liquid Crystals Based on the Concept of Nanostructured Side‐Chain Polymers

Abstract

Liquid crystal displays (LCDs) and related devices are indispensable components of modern information technology. The performance of these devices depends strongly on the properties of the liquid crystal material, its alignment, and the quality of the alignment layer. Achieving the desired liquid crystal orientation and controlling it precisely require careful selection of both the liquid crystal and the alignment material. In this work, a new class of photoalignment materials based on side‐chain polymers and co‐polymers has been designed and synthesized following the novel concept of “nanostructured liquid crystal alignment materials.” The results demonstrate that key photoalignment characteristics, including the preferred alignment direction, pretilt angle, and anchoring strength, can be effectively tailored by modifying the polymer molecular structure and controlling irradiation with linearly polarized ultraviolet (LPUV) light. Several experimental examples illustrate this controllable alignment behavior, whereas a simple theoretical model is proposed to explain the mechanism of tilted alignment (TA) formation and control. In addition, a rapid two‐step fabrication method for preparing photoalignment layers with significantly reduced processing time is introduced. By examining the interactions between liquid crystal molecules and the photoalignment layer, this study highlights the potential of these novel materials for advanced liquid crystal devices, offering improved alignment control, enhanced performance, and broader applicability in next‐generation photonic and display technologies.