Exit Pupil Expander for Laser-Scanner and Waveguide Based Augmented-Reality Displays

摘要

Lightweight, compact, and cost-efficient solutions for increasing the exit pupil size for use in laser-scanner and waveguide based augmented-reality displays are disclosed. Light from a laser-scanner is focused onto intermediate image plane; a diffuser is positioned at the intermediate image plane to steer light efficiently in a desired direction; the pupil is then expanded with a lens assembly; the lens assembly can contain one or more aspherical and/or free-form optics; the output of the lens assembly can then act as the input to a waveguide plate or stack; and the result is a large field-of-view image with sufficiently large exit pupil to overcome/reduce the pupil-replication problem.