Fig. 8From: Waveguide-based augmented reality displays: perspectives and challenges(a, b Are adapted from [2], and c, d are redrawn from [96])Issues induced by diffractive couplers and solutions. a Rainbow effect. b Eye glow. c Top view of a tilted waveguide at wrap angle \(\alpha\). d Side view of a tilted waveguide at pantoscopic angle \(\alpha\), wherein the light engine is hiddenBack to article page