Field-of-view expansion of VHOE based AR glasses

Near-eye-display has shown the potential to be the next-generation consumer interface to the digital devices. Among many techniques, exit-pupil-expansion (EPE) technique promises a simple and compact architecture. The volume-holographic-optical-element (VHOE) based EPE shows a lot of advantages based on multiplexing capability. However, only specific reading angle in each corresponding wavelength can passed through the VHOE based EPE technique. In this paper, we propose a novel field-of-view (FOV) expansion technique to conquer the FOV limitation of the VHOE-based EPE lightguide.