The mechanism of photoalignment is that the selective photoreaction broke out on the surface of the polymer under the irradiation of linearly polarized ultraviolet light ( lpuv ) . the orientational alignment of molecular chains induces lc alignment in a certain direction 光控取向的原理是在线偏振紫外光作用下，光敏聚合物侧链定向光交联，出现分子链段的指向有序分布，从而诱导液晶分子排列。
