Patent ID: 10935794

Abstract:
A beam scanner of a projector-based near-eye display includes a polarization volume hologram (PVH) grating. The PVH grating receives a polarized light beam from a light source and couples the beam to a tiltable reflector, e.g. a 2D tiltable MEMS reflector, for angular scanning the beam. The light beam impinging onto the tiltable reflector is separated from the light beam reflected from the tiltable reflector by polarization, due to the PVH grating diffracting light of only one handedness of polarization. Upon reflection from the tiltable reflector, the beam changes the handedness of polarization, which enables its separation from the impinging beam. The beam scanner may receive multiple light beams from multiple light sources. A projector and a near-eye display based on such beam scanners are also disclosed.