Multiplexed hologram tiling in a waveguide display
Near-eye display devices having angularly multiplexed holograms are disclosed. One example includes an image source, a waveguide, and a controller. The waveguide is configured to propagate light received the image source to a user of the near-eye display device, and includes a holographic grating including a plurality of angularly multiplexed holograms. The controller is configured to control display of an image via the image source.
1. A near-eye display device, comprising:
an image source;
a waveguide configured to propagate light from the image source to a field of view of the near-eye display device, the waveguide comprising a holographic grating comprising a plurality of angularly multiplexed holograms, each hologram of the plurality of angularly multiplexed holograms having an angular bandwidth that is narrower than a range of angles of light from the image source to provide a field of view narrower than the range of angles of light from the image source, each hologram of the plurality of angularly multiplexed holograms being configured to diffract an image from the image source,
the plurality of angularly multiplexed holograms configured to simultaneously diffract light received from the image source to produce angularly separated diffraction peaks from the light received from the image source, such that
the plurality of angularly multiplexed holograms has a combined angular bandwidth greater than the angular bandwidth of each individual hologram of the plurality of angularly multiplexed holograms to provide a combined field of view with a wider angular width than the field of view of each hologram of the plurality of angularly multiplexed holograms individually; and
a controller configured to control display of an image via the image source.
2. The near-eye display device of claim 1 , wherein the waveguide further comprises one or more additional holographic gratings, each additional holographic grating comprising a plurality of angularly multiplexed holograms.
3. The near-eye display device of claim 1 , wherein the image source comprises a plurality of laser light emitting diodes.
4. The near-eye display device of claim 1 , wherein the plurality of angularly multiplexed holograms includes a first hologram and a second hologram, the first hologram being angularly separated from the second hologram such that an angular bandwidth of the first hologram does not overlap with an angular bandwidth of the second hologram.
5. The near-eye display device of claim 1 , wherein each holographic grating includes three or more angularly multiplexed holograms.
6. The near-eye display device of claim 1 , wherein a field of view of the near-eye display device is 20 degrees or greater.
7. The near-eye display device of claim 1 , wherein the waveguide includes a multiplexed holographic grating for each color of light from the image source.
8. A near-eye display device, comprising:
an image source;
a waveguide configured to propagate light from the image source to a field of view of the near-eye display device, the waveguide comprising:
a holographic input grating comprising a first plurality of angularly multiplexed and spatially overlapping holograms, each hologram of the first plurality of angularly multiplexed and spatially overlapping holograms being configured to diffract an image from the image source and having an angular bandwidth that is narrower than a range of angles of light from the image source to provide a field of view with a narrower angular width than the range of angles from the image source, the first plurality of angularly multiplexed and spatially overlapping holograms being configured to simultaneously diffract light received from the image source to produce angularly separated diffraction peaks from the light received from the image source, such that the first plurality of angularly multiplexed and spatially overlapping holograms has a combined angular bandwidth greater than the angular bandwidth of each individual hologram of the plurality of angularly multiplexed and spatially overlapping holograms to provide a combined field of view with a wider angular width than the field of view provided by each hologram individually, and
a holographic output grating comprising a second plurality of angularly multiplexed and spatially overlapping holograms; and
a controller configured to control display of an image via the image source.
9. The near-eye display device of claim 8 , wherein the waveguide further comprises a holographic fold grating comprising a third plurality of angularly multiplexed and spatially overlapping holograms.
10. The near-eye display device of claim 8 , wherein the image source is a visible light array.
11. The near-eye display device of claim 8 , wherein the first plurality of angularly multiplexed and spatially overlapping holograms includes a first hologram and a second hologram, the first hologram being angularly separated from the second hologram such that at least a portion of an angular bandwidth of the first hologram does not overlap with an angular bandwidth of the second hologram.
12. The near-eye display device of claim 8 , wherein a field of view of the near-eye display device is 20 degrees or greater.
13. The near-eye display device of claim 8 , wherein each of the holographic input grating and the holographic output grating includes three or more angularly multiplexed and spatially overlapping holographic recordings.