Eyewear waveguide with reflector
Eyewear including a frame, a projector supported by the frame, and a lens supported by the frame. The lens has a first surface facing an eye of the user and a second surface facing away from the eye of the user when the frame is worn. The lens also includes a waveguide defined by the first and second surfaces to receive light from the projector. An input light coupler and an output light coupler are on the first surface of the lens and at least one reflector is positioned on a second surface of the lens to redirect light received from the input coupler and/or the output coupler to redirect light having an angle of incidence with respect to the second surface of the lens that would result in that portion of the light exiting the waveguide through the second surface in the absence of the at least one reflector.
1. Eyewear comprising:
a projector configured to project light;
a lens having a first surface facing an eye of a user and a second surface facing away from the eye of the user to form at least one waveguide defined by the first and second surfaces;
an input light coupler on one of the first surface or the second surface adjacent a perimeter of the lens and configured to couple the projected light into the at least one waveguide;
an output light coupler for the at least one waveguide on the first surface of the lens that is positioned in a viewing area of the lens when the eyewear is worn to couple a first portion of the projected light out of the at least one waveguide toward the eye of the user and to reflect a second portion of the projected light into the at least one waveguide; and
a first reflector on the second surface of the lens opposite the output light coupler on the first surface of the lens, the first reflector positioned on the second surface in the viewing area of the lens to redirect back toward the output light coupler the second portion of the projected light from the output light coupler having an angle of incidence with respect to the second surface that would result in the second portion of the projected light exiting the at least one waveguide through the second surface in the absence of the first reflector, wherein the second portion of the projected light redirected by the first reflector is coupled by the output light coupler out of the at least one waveguide toward the eye of the user with the first portion of the projected light so as to increase brightness of the light projected toward the eye of the user.
2. The eyewear of claim 1 , wherein the input light coupler is on the first surface positioned adjacent a perimeter of the lens to couple light into a first waveguide or a second waveguide; and
a second reflector positioned on a second surface adjacent the perimeter of the lens to redirect into the first waveguide or the second waveguide a first portion of the projected light from the input light coupler having an angle of incidence with respect to the second surface that would result in the first portion of the projected light from the input light coupler exiting the first waveguide or the second waveguide through the second surface in the absence of the second reflector.
3. The eyewear of claim 2 , further comprising a housing containing the projector, the input light coupler, and the second reflector.
4. The eyewear of claim 2 , wherein the input light coupler is configured to direct a first spectrum of the light into the first waveguide and a second spectrum of the light into the second waveguide.
5. The eyewear of claim 2 , wherein the input light coupler is at least one of a diffractive grating, a diffractive coating, or a holographic grating.
6. The eyewear of claim 2 , wherein the second reflector on the second surface of the lens is a mirror.
7. The eyewear of claim 2 , wherein the first reflector is coplanar to the first waveguide or the second waveguide.
8. The eyewear of claim 1 , wherein the first reflector is tuned to reflect 5 to 20 percent of the second portion of the projected light from the output light coupler.
9. A method for presenting an image on eyewear to be worn by a user, the eyewear having a lens including first and second surfaces defining at least one waveguide, the first surface facing an eye of the user and the second surface facing away from the eye of the user when the eyewear is worn, the method comprising:
projecting light into an input light coupler on one of the first surface or the second surface adjacent a perimeter of the lens and configured to couple the projected light into at least one waveguide;
coupling, with an output light coupler for the at least one waveguide that is positioned in a viewing area on the first surface of the lens, a first portion of projected light including the image out of the at least one waveguide toward the eye of the user and to reflect a second portion of the projected light into the at least one waveguide; and
redirecting back toward the output light coupler with a first reflector on the second surface of the lens opposite the output light coupler the second portion of the light received from the output light coupler having an angle of incidence with respect to the second surface of the lens that would result in the second portion of the light exiting the at least one waveguide through the second surface of the lens in the absence of the first reflector, wherein the second portion of the light redirected by the first reflector is coupled by the output light coupler out of the at least one waveguide toward the eye of the user with the first portion of the light so as to increase brightness of the light including the image projected toward the eye of the user.
10. The method of claim 9 , further comprising:
redirecting, with a second reflector on the second surface of the lens, a portion of the light from the input light coupler into the at least one waveguide having an angle of incidence with respect to the second surface of the lens that would result in the portion of the light from the input light coupler exiting the at least one waveguide through the second surface in the absence of the second reflector.
11. The method of claim 10 , further comprising:
the input light coupler directing a first spectrum of the light into a first waveguide and a second spectrum of the light into a second waveguide.
12. The method of claim 11 , further comprising positioning the first reflector to be coplanar to the first waveguide or the second waveguide.
13. The method of claim 9 , wherein redirecting the second portion of the light received from the output light coupler further comprises redirecting 5 to 20 percent of the second portion of the light received from the output light coupler back toward the output light coupler.
14. A method for forming eyewear to be worn by a user, the method comprising:
forming an output light coupler on a first surface of a lens, the output light coupler configured to at least one of couple light into a first waveguide or a second waveguide or couple light out of the first waveguide or second waveguide, the output light coupler coupling a first portion of light including an image out of the first waveguide or second waveguide toward an eye of the user and reflecting a second portion of light including the image into the first waveguide or second waveguide;
forming an input light coupler on one of the first surface or the second surface adjacent a perimeter of the lens and configured to couple projected light into the first waveguide or the second waveguide; and
forming a first reflector on a second surface of the lens opposite the output light coupler, the first reflector configured to redirect back toward the output light coupler the second portion of light from the output light coupler having an angle of incidence with respect to the second surface of the lens that would result in the second portion of the light exiting the first waveguide or second waveguide through the second surface in the absence of the first reflector, wherein the second portion of the light redirected by the first reflector is coupled by the output light coupler out of the first waveguide or second waveguide toward the eye of the user with the first portion of the light including the image so as to increase brightness of the light including the image projected toward the eye of the user.
15. The method of claim 14 , further comprising:
forming a second reflector on the second surface of the lens adjacent the perimeter of the lens in an area that receives light from the input light coupler, the second reflector adapted to redirect a portion of the light from the input light coupler into the first waveguide or second waveguide having an angle of incidence with respect to the second surface of the lens that would result in the portion of the light from the input light coupler exiting the first waveguide or second waveguide through the second surface in the absence of the second reflector.
16. The method of claim 15 , further comprising:
positioning the lens within a frame including a housing that covers the input light coupler and the second reflector.
17. The method of claim 14 , wherein forming the first reflector comprises forming the first reflector to be coplanar to the first waveguide or the second waveguide.
18. The method of claim 14 , further comprising tuning the first reflector to reflect 5 to 20 percent of the second portion of the projected light from the output light coupler.
19. The method of claim 14 , further comprising configuring the input light coupler to direct a first spectrum of the light into the first waveguide and a second spectrum of the light into the second waveguide.
20. The method of claim 14 , wherein the input light coupler comprises at least one of a diffractive grating, a diffractive coating, or a holographic grating.