Field curvature corrected display
A head mounted display (HMD) includes a field curvature corrected (FC) display to mitigate field curvature in an image that is output to a user's eyes. The FC display includes elements that generate the image light and elements to mitigate field curvature from the image light. The FC display may include a display panel with lenses, a display panel with a reflective polarizer and reflective surface, or other optical elements. The FC display may include a pancake lens configuration including a polarized display with a quarter wave plate, a reflective mirror, and a polarization reflective mirror.
1. A system comprising:
a field curvature corrected (FC) display configured to correct for field curvature in an image that is output to an eye of a user of the system, the FC display comprising:
a display block configured to output image light, the display block comprising:
a projector and a diffuser, the diffuser configured to receive the image light from the projector, the diffuser having a shape configured to output the image light corrected for field curvature and corrected for an additional optical aberration; and
an optics block configured to optically direct the image light corrected for field curvature to an exit pupil of the system corresponding to a location of the eye of the user of the system.
2. The system of claim 1 , wherein the shape of the diffuser is configured to output the image light along a curved image plane that corresponds to a focal plane of the optics block.
3. The system of claim 1 , wherein the diffuser is configured to diffuse the image light from the projector.
4. The system of claim 1 , wherein the diffuser includes a reflective surface.
5. The system of claim 1 , wherein the projector is positioned behind the diffuser relative to the eye of the user.
6. The system of claim 1 , wherein the projector is positioned in front of the diffuser relative to the eye of the user.
7. The system of claim 1 , wherein the projector is a laser projector.
8. The system of claim 1 , wherein the projector is a pico projector.
9. The system of claim 1 , wherein the projector includes a digital mirror device (DMD).
10. The system of claim 1 , wherein the shape of the diffuser is spherically concave.
11. The system of claim 1 , wherein the shape of the diffuser is spherically convex.
12. The system of claim 1 , wherein the shape of the diffuser is a rotationally symmetric sphere.
13. The system of claim 1 , wherein the shape of the diffuser is a freeform shape.
14. A system comprising:
a projector configured to project image light;
a curved diffuser configured to receive the image light and to diffuse the image light, the diffuser having a shape configured to output the image light corrected for field curvature and corrected for an additional optical aberration; and
an optics block having a curved focal plane configured to optically direct the image light corrected for field curvature to an exit pupil of the system corresponding to a location of an eye of a user of the system.
15. The system of claim 14 , wherein a grain size of the curved diffuser is an order of magnitude smaller than a pixel pitch of the projector.
16. The system of claim 14 , wherein the shape of the curved diffuser is configured to output the image light along a curved image plane that corresponds to the curved focal plane of the optics block to correct for the field curvature.
17. The system of claim 14 , wherein the curved diffuser includes a reflective surface.
18. The system of claim 14 , wherein the projector is a laser projector, a pico projector, or a projector that includes a digital mirror device (DMD).
19. A system comprising:
a field curvature corrected (FC) display configured to correct for field curvature in an image that is output to an eye of a user of the system, the FC display comprising:
a display block configured to output image light, the display block comprising:
a projector and a diffuser, the diffuser configured to receive the image light from the projector, the diffuser having a shape configured to output the image light corrected for field curvature, and a grain size of the diffuser is an order of magnitude smaller than a pixel pitch of the projector; and
an optics block configured to optically direct the image light corrected for field curvature to an exit pupil of the system corresponding to a location of the eye of the user of the system.
20. A system comprising:
a projector configured to project image light;
a curved diffuser configured to receive the image light and to diffuse the image light, and a grain size of the diffuser is an order of magnitude smaller than a pixel pitch of the projector; and
an optics block having a curved focal plane configured to optically direct the image light corrected for field curvature to an exit pupil of the system corresponding to a location of an eye of a user of the system.