Affiliation:
1. National & Local United Engineer Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering Fuzhou University Fuzhou China 350116
2. Nanophotonics Research Centre, Institute of Microscale Optoelectronics Shenzhen University Shenzhen China 518060
Abstract
The optical waveguide shows advantages in terms of exit pupil and appearance shape, and is the mainstream method of AR combiner in the future. The method of exit pupil expansion is to diffract and derive the waveguide along the propagation direction for many times, so that the brightness of the exit pupil gradually darkens in space along the direction of light propagation, resulting in the unevenness of the exit pupil. Especially, polarization volume grating (PVG) is used as a coupler, PVG only responds to one of the circularly polarized light, and the orthogonal circularly polarized light will be directly transmitted. Therefore, a waveguide AR engine based on PVG is proposed here, and the left‐handed circularly polarized light and right‐handed circularly polarized light are used to expand the range of the eyebox without reducing its brightness uniformity. The experimental test results show that the range of the eye box is doubled while maintaining 66.6% global uniformity at a horizontal field of view of 32.8°.