Augmented reality display
Abstract:
A near eye display assembly includes (a) frame; (b) a combiner operably connected to the frame as a first reflective surface positionable in front of an eye of a user of the display assembly; (c) a secondary mirror operably connected to the frame as a second reflective surface positionable proximate a side of the nose adjacent to the eye of a user of the display assembly; (d) an image source operably connected to the frame and optically coupled to the secondary mirror along an optical path; and (e) an optical fold element between the image source and the secondary mirror in the optical path, and positionable proximate the temple adjacent to the eye of a user of the display assembly; wherein an intermediate image is formed in the optical path between the image source and the secondary mirror, wherein the combiner and the secondary mirror are in an off-axis folded geometry which directs images from the optical fold element to an eyebox of the near eye display assembly, and at least one of the combiner and the secondary mirror include a freeform surface, wherein the freeform component corrects optical aberrations induced by a tilting and decentering of the first reflective surface and the second reflective surface, and wherein at least the combiner includes a nanostructured meta-surface which further provides wavefront control of an image from the image source to be directed to the eyebox and enables the combiner to be positioned at a tilt angle so that unobscured images are conveyable between the optical fold element and the secondary mirror while providing an FOV of at least 30 degrees and an eyebox width of at least 5 mm.
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