Eyeglass-integrated display device using multiple embedded projectors and display windows
Advanced display devices are integrated into glasses so that they look and feel more like normal glasses. They are based on pupil replication using multiple, small projectors. A number of projectors are embedded in the eyeglasses, for example embedded in the rim of the eyeglasses or in a periphery of the lens. The projectors generate (partial) images based on a common image to be displayed to the user. These images are optically coupled through the lens, for example using waveguide coupling, to different display windows in the lens. The display windows couple the images out of the lens and towards the user's eye.
1. An eyeglass-integrated display device comprising:
eyeglasses comprising an eyeglasses frame, and lenses mounted in the eyeglasses frame;
at least two projectors embedded in the eyeglasses; and
at least four display windows positioned at different locations in the superior/inferior and nasal/temporal dimensions in one of the lenses, wherein each of at least two of the projectors is optically coupled through the lens to only a single row of at least two of the display windows, each projector generates an image that is a portion of a common image and the display windows direct the images from the projectors towards a user's eye, and the projectors are powered on and off based on eye tracking of the user's eye.
2. The device of claim 1 wherein the eyeglasses frame comprises a rim, and at least one of the projectors is embedded in the rim.
3. The device of claim 2 wherein the projector located along the rim projects images directly into the lens and towards the display windows through an edge of the lens without any turning mirror.
4. The device of claim 2 wherein the projector located along the rim does not protrude beyond an exterior edge of the rim.
5. The device of claim 1 wherein at least one of the projectors is embedded in the lens.
6. The device of claim 5 wherein the projector located in the lens projects images directly into the lens and towards the display windows without any turning mirror.
7. The device of claim 5 wherein the projector located in the lens does not protrude beyond a front surface or a back surface of the lens.
8. The device of claim 1 wherein the projectors are not visible to an outside observer when the eyeglasses are worn by the user.
9. The device of claim 1 wherein every projector has a length of not more than 3 mm.
10. The device of claim 1 wherein every projector has a maximum lateral size of not more than 3 mm.
11. The device of claim 1 wherein at least one projector comprises:
an image source;
a convex secondary mirror facing the image source, wherein image-forming rays from the image source are incident on and reflected by the secondary mirror;
a concave primary mirror facing the secondary mirror and further reflecting the image-forming rays from the secondary mirror, the secondary mirror and primary mirror cooperating to project the image from the image source; and
a solid transparent substrate with the primary mirror on one end of the substrate and with the secondary mirror on an opposite end of the substrate.
12. The device of claim 1 wherein the display windows are arranged as a two-dimensional array.
13. An eyeglass-integrated display device comprising:
eyeglasses comprising an eyeglasses frame and lenses mounted in the eyeglasses frame, wherein the eyeglasses frame comprises a rim;
at least two projectors embedded in a top of the rim, wherein the projectors do not protrude beyond an exterior edge of the rim; and
at least four display windows arranged as a two-dimensional array in the superior/inferior and nasal/temporal dimensions in one of the lenses, wherein each projector is optically coupled through the lens to only a single vertical row of at least two of the display windows, each projector generates an image that is a portion of a common image and projects the image directly into the lens and towards the vertical row of display windows through an edge of the lens without any turning mirror, and the display windows direct the images from the projectors towards a user's eye.
14. The device of claim 13 wherein each projector is optically coupled to not more than 5 display windows.
15. The device of claim 13 wherein the eye box for the device fills a center of the user's field of view.
16. An eyeglass-integrated display device comprising:
eyeglasses comprising an eyeglasses frame, and lenses mounted in the eyeglasses frame;
at least two projectors embedded in the eyeglasses, wherein every projector has a length of not more than 3 mm and a maximum lateral size of not more than 3 mm; and
at least four display windows positioned at different locations in the superior/inferior and nasal/temporal dimensions in one of the lenses, wherein each projector is optically coupled through the lens to at least two and not more than five of the display windows, each projector generates an image that is a portion of a common image and the display windows direct the images from the projectors towards a user's eye, and the eye box for the device occupies a peripheral region of the user's field of view.
17. The device of claim 16 further comprising:
eye tracking sensors mounted on the eyeglasses.
18. The device of claim 17 wherein the projectors are powered on and off based on eye tracking of the user's eye.
19. The device of claim 16 wherein the lens comprises waveguide optics for optically coupling images from the projectors to the display windows.
20. The device of claim 19 wherein the display windows comprise at least one of a volume holographic grating, a surface relief grating, and a polarization volume grating.
21. The device of claim 16 further comprising:
communications and power electronics mounted on the eyeglasses, coupled to provide image data and power to the projectors.