公开(公告)号：US12228730B2

公开(公告)日：2025-02-18

申请号：US18711640

申请日：2022-12-29

Applicant: SOUTHEAST UNIVERSITY

Inventor： Yishi Weng ,  Yuning Zhang ,  Yuchen Gu ,  Lixuan Zhagn ,  Chuang Wang ,  Ran Wei

IPC: G02B6/35 ,  G02B6/34 ,  G02B27/00

Abstract: A two-dimensional exit pupil expansion method for waveguide display based on polarization volume gratings (PVGs) is provided. Based on the polarized diffraction properties of the PVGs as waveguide coupling elements, a light beam from a microimage source system is introduced into and then propagates in a waveguide medium. By a composite PVG structure, a light field of a transmitted image is subjected to two-dimensional exit pupil expansion and emission, and finally incident into human eyes to achieve waveguide augmented reality imaging.