US Patent 11280997 Low-obliquity pupil relay for tiltable reflectors

A beam scanner of a near-eye display includes a pair of tiltable reflectors and a beam-folding pupil relay coupling the tiltable reflectors optically together. The beam-folding pupil relay includes a beamsplitter for receiving the light beam reflected by the first tiltable reflector, and a first curved reflector for receiving the light beam from the beamsplitter, and for reflecting the light beam back towards the beamsplitter. The beam-folded pupil relay is configured to couple the light beam reflected by the first curved reflector to the second tiltable reflector. A second curved reflector may be provided for coupling the light beam scanned by the tiltable reflectors to a pupil-replicating waveguide. A controller may be provided for scanning the light beam in coordination with operating the light source at varying levels of brightness or color.