Patent ID: 11906736
Assignee: RAYTRX, LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 17:
18. A method for forming an image for a viewer of a wearable display apparatus, the method comprising:
providing an image generator that forms a 2D image;
providing a partially transmissive curved mirror having a curved focal surface and a partially transmissive curved reflective surface;
providing a beam splitter disposed to reflect light toward the partially transmissive mirror, wherein the curved focal surface is defined in a space between the partially transmissive curved reflective surface and the beam splitter;
providing an optical image relay positioned between the image generator and the beam splitter, and configured to conjugate the formed 2D image from the image generator to the curved focal surface of the partially transmissive mirror, the optical image relay including:
a right-angle prism having a prism input surface, a prism output surface, and a folding surface extending from the prism input surface to the prism output surface;
a first plano-aspheric lens in optical contact against the prism input surface and configured to guide light from the image generator toward the folding surface and to form an aperture stop for the optical image relay at the folding surface;
a doublet positioned between the first plano-aspheric lens and the image generator;
a meniscus singlet lens positioned between the doublet and the image generator; and
a concave-plano field lens positioned between the meniscus singlet and the image generator;
forming an eyebox for display, from an intermediate image formed on the curved focal surface, by disposing the beam splitter to reflect light from the optical image relay toward the partially transmissive curved mirror;
configuring the optical image relay to:
direct modulated light from the image generator along an optical path;
focus the light through the aperture stop formed at the folding surface of the right-angle prism; and
fold the optical path to direct the modulated light to focus along the curved focal surface; and
providing one or more signals to the image generator for providing modulated light output, wherein the optical image relay, the partially transmissive curved mirror, and the beam splitter are configured to form an exit pupil within the eyebox for viewing the 2D image superimposed on a portion of an object scene that is visible through the partially transmissive curved mirror.