Virtual and augmented reality systems and methods
View Patent ↗A system for displaying virtual content to a user includes at least one light source to multiplex a plurality of light beams to display a respective plurality of light patterns associated with one or more frames of image data. The system also includes a plurality of waveguides to receive the plurality of light beams and to direct the plurality of light beams toward an exit pupil, wherein the plurality of waveguides are stacked along an optical axis of the user. The system further includes at least one optical element to modify a focus of a light beam of the plurality of light beams directed by the plurality of waveguides.
1. A system for displaying content to a user, comprising:
a light source configured to project light associated with at least first and second frames of image data;
a waveguide assembly configured to relay the projected light towards at least one eye of a user with a wavefront curvature for a focus level corresponding to a focal distance for the respective first or second frame of image data; and
wherein the waveguide assembly comprises:
a first planar waveguide component operatively coupled to a first lens to modify first light associated with the first frame of image data after the first light exits from the first planar waveguide component such that the first light is perceived as coming from a first focal plane, and
a second planar waveguide component operatively coupled to both the first lens and a second lens to modify second light associated with the second frame of image data after the second light exits from the second planar waveguide component such that the second light is perceived as coming from a second focal plane different from the first focal plane,
wherein the first planar waveguide component and the second planar waveguide component sandwich the first lens,
wherein the first lens and the second lens sandwich the second planar waveguide component, and
wherein the first and second planar waveguide components and the first and second lenses are stacked along a z-axis in front of the at least one eye of the user.
2. The system of claim 1 , wherein the first lens is a refractive lens.
3. The system of claim 1 , wherein the first lens is a diffractive lens.
4. The system of claim 1 , wherein the first lens is a weak lens.
5. The system of claim 1 , further comprising a compensating lens optically coupled to the first lens.
6. The system of claim 5 , wherein the compensating lens has a first optical power and the first lens has a second optical power, the first optical power equal to a negative of the second optical power.
7. The system of claim 5 , wherein the first lens and the compensating lens is a variable focus lens element.
8. The system of claim 1 , wherein the second lens is a refractive lens.
9. The system of claim 1 , wherein the second lens is a diffractive lens.
10. The system of claim 1 , wherein the second lens is a weak lens.
11. The system of claim 1 , further comprising a compensating lens optically coupled to the waveguide assembly.
12. The system of claim 11 , wherein the compensating lens has a first optical power, the first lens has a second optical power, and the second lens has a third optical power, the first optical power equal to a negative sum of the second optical power and third optical powers.
13. The system of claim 11 , wherein the first lens, the second lens, and the compensating lens is a variable focus lens element.
14. The system of claim 1 , wherein the waveguide assembly comprises a diffractive optical element (DOE).
15. The system of claim 14 , wherein the DOE is switchable between an on and off state.
16. The system of claim 1 , wherein at least one of the first or second planar waveguide components comprises lithium niobate.
17. The system of claim 1 , wherein the waveguide assembly comprises a Fresnel zone plate.
18. The system of claim 1 , wherein the first frame and the second frame are delivered to the at least one eye of the user simultaneously.
19. The system of claim 1 , wherein the first frame and the second frame of image data are delivered to the at least one eye of the user sequentially.
20. The system of claim 1 , further comprising a plurality of angled reflectors configured to deliver light to the at least one eye of the user, wherein the first planar waveguide component and the second planar waveguide component direct light to the plurality of angled reflectors.
21. The system of claim 20 , wherein the plurality of angled reflectors comprise lithium niobate.
22. The system of claim 1 , wherein at least one of the first or second planar waveguide components have an optical power of zero diopters.
23. The system of claim 1 , wherein each of the first and second planar waveguide components are configured to propagate first or second light across a length of the respective first or second planar waveguide component in a direction orthogonal to the z-axis.
24. The system of claim 23 , wherein the propagation is by total internal reflection.
25. The system of claim 24 , wherein each of the first and second planar waveguide component outcouple a sampled plurality of exit pupils distributed across the length of the respective first or second planar waveguide components towards the eye of the user.
26. The system of claim 25 , wherein the sampled plurality of exit pupils from a respective first or second planar waveguide component are associated with the first or second light.
27. The system of claim 1 , wherein the first lens modifies the second light associated with the second frame of image data after the second light passes through the second lens.