Patent ID: 11880036
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Optics (Instruments)
Classification: CPC G  B | IPC B  G

Claim 0:
1. A waveguide head-up display (HUD), the waveguide HUD comprising:
a waveguide including a lower surface and an upper surface, wherein the waveguide is configured to receive an input and project, based on the input, at least one image from the upper surface and into an eyebox;
a prism arranged at least one of on and above the waveguide, wherein the prism includes a lower surface facing the waveguide and configured to receive the at least one image and an upper surface opposite the lower surface configured to project the at least one image received via the lower surface of the prism,
wherein the upper surface of the prism is angled relative to the upper surface of the waveguide such that a first normal of the upper surface of the prism is different from a second normal of the upper surface of the waveguide, and
wherein the upper surface of the prism is configured to deflect ambient light directed at the waveguide away from the eyebox,
wherein the first normal of the upper surface of the prism is selected such that ambient light having an incident angle within a predetermined range of the first normal is directed away from the eyebox;
an anti-reflective (AR) coating on the lower surface of the prism; and
a filter coating on the upper surface of the prism.