Fig. 9
From: Waveguide-based augmented reality displays: perspectives and challenges
(a, c Are redrawn from [102], b is reprinted with permission from [87] © The Optical Society, and d is redrawn from [2])
Issues induced by diffractive waveguide couplers and solutions. a Light leakage at in-coupler. b Theoretical in-coupling efficiency after the in-coupler. c Enhanced in-coupling efficiency by QWP. d See-through ghost images generated by the out-coupler