METHOD AND SYSTEM FOR VARIABLE OPTICAL THICKNESS WAVEGUIDES FOR AUGMENTED REALITY DEVICES

An augmented reality device includes a projector, projector optics optically coupled to the projector, and a substrate structure including a substrate having an incident surface and an opposing exit surface and a first variable thickness film coupled to the incident surface. The substrate structure can also include a first combined pupil expander coupled to the first variable thickness film, a second variable thickness film coupled to the opposing exit surface, an incoupling grating coupled to the opposing exit surface, and a second combined pupil expander coupled to the opposing exit surface.