基于单层基板双面液晶偏振体光栅的大视场角光波导AR显示
Wide-field-of-view AR waveguide display enabled by one substrate coated with double-sided polarization volume gratings
摘要
Abstract
Cross type liquid crystal polarization volume grating(PVG)-based two-dimensional pupil expansion waveguides have emerged as a research hotspot in AR displays due to their compact structure and fabrication simplicity(no dynamic adjustment of interference angles is required during holographic exposure);however,their field of view(FOV)for AR applications is constrained by traditional dual-waveguide stacking approaches.To enhance the FOV,this work proposes an optical waveguide architecture based on a single-layer high-refractive-index glass substrate(n=1.9)coated with left-handed and right-handed PVGs on both surfaces,where the horizontal azimuthal angles of the reciprocal lattice vectors for the input-coupler and output-coupler gratings are 0° and 60°,respectively.Incident light is split into two separate total internal reflection paths via PVG polarization selectivity;partial out-coupling occurs when the combined reciprocal lattice vector provided by the input and output gratings sums to zero,forming a complete two-dimensional expanded exit pupil.Based on the grating diffraction equation and substrate refractive index,we derived the required PVG period for the central FOV aligned with the waveguide normal direction.In addition,the input-coupling mechanism for vertically incident 532 nm collimated light is validated via COMSOL simulations.The fabricated prototype(28 mm×22 mm output grating)achieved a 32.8°(horizontal)×18.7°(vertical)FOV(37.8° diagonal),representing a 26%improvement in the diagonal FOV over prior work.This design eliminates traditional bonding processes by direct dual-side PVG fabrication,circumventing stringent requirements for index-matching adhesives/substrates,significantly simplifying fabrication process and reducing costs.The high-refractive-index substrate further increases FOV while enhancing image quality,providing a promising high-performance solution for AR near-eye displays.关键词
液晶偏振体全息光栅/视场角/二维扩瞳/光波导AR显示/液晶光学Key words
liquid crystal polarization volume grating/field of view/two-dimensional exit pupil expansion/waveguide-based AR display/liquid crystal optics分类
信息技术与安全科学引用本文复制引用
钟梁志煌,陈全明,罗丹..基于单层基板双面液晶偏振体光栅的大视场角光波导AR显示[J].液晶与显示,2026,41(2):188-196,9.基金项目
国家自然科学基金(No.62575135,No.62175098,No.U22A20163,No.62405127) （No.62575135,No.62175098,No.U22A20163,No.62405127）
国家重点研发计划(No.2022YFA1203700) （No.2022YFA1203700）
广东省基础与应用基础研究基金(No.2021B1515020097) （No.2021B1515020097）
国家资助博士后研究人员计划(No.GZC20240640) （No.GZC20240640）
南方科技大学校长卓越博士后项目Supported by National Natural Science Foundation of China(No.62575135,No.62175098,No.U22A20163,No.62405127) （No.62575135,No.62175098,No.U22A20163,No.62405127）
National Key Research and Development Program of China(No.2022YFA1203700) （No.2022YFA1203700）
Guangdong Basic and Applied Basic Research Foundation(No.2021B1515020097) （No.2021B1515020097）
Postdoctoral Fellowship Program of CPSF under Grant Number(No.GZC20240640) （No.GZC20240640）
SUSTech Presidential Postdoctoral Fellowship. （）
