Method and system for fiber scanning projector with angled eyepiece

A wearable display system comprising:

• a fiber scanner including:
• an optical fiber;
• and
• a scanning mechanism configured to scan a tip of the optical fiber along an emission trajectory, the emission trajectory defining an optical axis;
• an eyepiece positioned in front of the tip of the optical fiber, the eyepiece including:
• a planar waveguide having a first surface facing the tip of the optical fiber and a second surface opposite the first surface, the planar waveguide oriented such that a normal of the planar waveguide is tilted at a first angle with respect to the optical axis;
• an incoupling diffractive optical element (DOE) coupled to the second surface of the planar waveguide in a first lateral region that is intercepted by the optical axis, the incoupling DOE comprising a metallized back surface and configured to reflect a first portion of an input light beam emitted from the optical fiber;
• and
• an outcoupling DOE coupled to a second lateral region of the planar waveguide and configured to diffract a portion of light propagating in the planar waveguide out of the planar waveguide toward an eye of a viewer;
• and
• a collimating optical element configured to:
• receive the first portion of the input light beam reflected by the incoupling DOE;
• and
• collimate and reflect the first portion of the input light beam toward the eyepiece;
• wherein the incoupling DOE is further configured to diffract a first fraction of the first portion of the input light beam.

A wearable display system comprising:

• a fiber scanner comprising:
• an optical fiber having a distal end and configured for projection of a light beam from the distal end, an optical axis of the fiber scanner being defined as co-axial with the light beam as projected from the optical fiber when the optical fiber is not deflected;
• and
• a scanning mechanism configured to deflect the optical fiber to scan the light beam to produce a scanned light beam that forms an image;
• an eyepiece comprising:
• a planar waveguide oriented non-perpendicular to the optical axis of the fiber scanner;
• and
• an incoupling diffractive optical element (DOE) coupled to the planar waveguide, the incoupling DOE being configured to diffract the scanned light beam incident on the incoupling DOE on a first pass to produce a first pass first diffracted light beam that fails total internal reflection (TIR) condition of the planar waveguide;
• and
• a collimating optical element configured to reflect a portion of the scanned light beam that passes through the incoupling DOE on the first pass to produce a reflected portion of the scanned light beam incident on the incoupling DOE on a second pass, and wherein the incoupling DOE is configured to diffract the reflected portion of the scanned light beam on the second pass to produce a second pass first diffracted light beam that meets the TIR condition of the planar waveguide.