Geometric phase lens alignment in an augmented reality head mounted display
A HMD includes a display block. The display block combines light from a local area with image light to form an augmented scene. The display block also provides the augmented scene to an eyebox corresponding a location of a user's eye. The display block includes a waveguide display, a focusing assembly and a compensation assembly. The waveguide display emits the image light. The focusing assembly includes a focusing geometric phase lens and presents the augmented scene at a focal distance. The compensation assembly includes a compensation geometric phase lens that has an axis of orientation orthogonal to an axis of orientation of the focusing geometric phase lens. The compensation assembly compensates the optical power of the focusing assembly.
1. A display block comprising:
a focusing geometric phase lens configured to present visual content including light from a local area, wherein the light from the local area includes light at a first wavelength and light at a second wavelength, the second wavelength being different from the first wavelength; and
a compensating geometric phase lens having an optical power that compensates for an optical power of the focusing geometric phase lens, and the compensating geometric phase lens is oriented relative to the focusing geometric phase lens such that respective retardances of the light at the first wavelength and the light at the second wavelength introduced by passing through the compensating geometric phase lens are offset by respective retardances of the light at the first wavelength and the light at the second wavelength introduced by passing through the focusing geometric phase lens.
2. The display block of claim 1 , wherein the focusing geometric phase lens and the compensating geometric phase lens each has a half-wave retardance for the light at the first wavelength.
3. The display block of claim 2 , wherein the first wavelength is 550 nm.
4. The display block of claim 1 , wherein the focusing geometric phase lens and the compensating geometric phase lens each has a one-wave retardance for the light at the first wavelength.
5. The display block of claim 4 , wherein the first wavelength is 550 nm.
6. The display block of claim 1 , wherein the compensating geometric phase lens is oriented orthogonally to the focusing geometric phase lens.
7. The display block of claim 1 , wherein the focusing geometric phase lens and the compensating geometric phase lens have a same focal length.
8. The display block of claim 1 , further comprising:
a first switchable half-wave plate; and
a second switchable half-wave plate,
wherein the first switchable half-wave plate and second switchable half-wave plate each having a zero-retardation state and a half-wave retardation state that affect which focal plane the visual content is presented, and are configured to change state in accordance with multi-focal instructions.
9. The display block of claim 1 , wherein the visual content includes an augmented scene, and the display block is a component of a head-mounted display and is configured to provide the augmented scene to an eyebox of the head-mounted display corresponding a location of a user's eye.
10. The display block of claim 9 , wherein the head-mounted display further comprises an eye tracking system that determines eye tracking information of a user's eye.
11. A display block comprises:
a waveguide display configured to emit at least a portion of an image;
a focusing geometric phase lens configured to present visual content including the portion of the image and light from a local area, wherein the light from the local area includes light at a first wavelength and light at a second wavelength, the second wavelength being different from the first wavelength; and
a compensating geometric phase lens having an optical power that compensates for an optical power of the focusing geometric phase lens, and the compensating geometric phase lens is oriented relative to the focusing geometric phase lens such that respective retardances of the light at the first wavelength and the light at the second wavelength introduced by passing through the compensating geometric phase lens are offset by respective retardances of the light at the first wavelength and the light at the second wavelength introduced by passing through the focusing geometric phase lens.
12. The display block of claim 11 , wherein the focusing geometric phase lens and the compensating geometric phase lens each has a half-wave retardance for the light at the first wavelength.
13. The display block of claim 12 , wherein the first wavelength is 550 nm.
14. The display block of claim 11 , wherein the focusing geometric phase lens and the compensating geometric phase lens each has a one-wave retardance for the light at the first wavelength.
15. The display block of claim 14 , wherein the first wavelength is 550 nm.
16. The display block of claim 11 , wherein the compensating geometric phase lens is oriented orthogonally to the focusing geometric phase lens.
17. The display block of claim 11 , wherein the focusing geometric phase lens and the compensating geometric phase lens have a same focal length.
18. The display block of claim 11 , further comprising:
a first switchable half-wave plate; and
a second switchable half-wave plate,
wherein the first switchable half-wave plate and second switchable half-wave plate each having a zero-retardation state and a half-wave retardation state that affect which focal plane the visual content is presented, and are configured to change state in accordance with multi-focal instructions.
19. The display block of claim 11 , wherein the visual content includes an augmented scene, and the display block is a component of a head-mounted display and is configured to provide the augmented scene to an eyebox of the head-mounted display corresponding a location of a user's eye.
20. The display block of claim 19 , wherein the head-mounted display further comprises an eye tracking system that determines eye tracking information of a user's eye.