Design optimization of polarization volume gratings for full-color waveguide-based AR displays

Abstract

Reflective polarization volume gratings (PVGs) can be used as input and output couplers in a diffractive waveguide-based augmented reality (AR). To improve the stability and wearing comfort, a thin and lightweight full-color waveguide display is needed. In this paper, we propose a single full-color waveguide AR display based on PVGs. By analyzing the optical system, we derived the field of view limit by optimizing a three-layer PVG as an in-coupler. Pairing with a single-layer, thin PVG as an out-coupler, we can achieve a relatively uniform exit pupil of 8 mm at horizontal pupil expansion direction.