Adjustable pupil distance wearable display
Disclosed herein are devices and methods to provide a display including a projection system and a removable lenses including a holographic optical element to receive light and reflect the light to an exit pupil. Each of the removable lenses may comprise a holographic optical element in a different position of the lens to change the position of the exit pupil. The projection system may project an image onto the holographic optical element to project the image to the exit pupil.
1. A system for projecting an image, the system comprising:
a frame to removably receive a plurality of projection surfaces, one at a time, each of the plurality of projection surfaces comprising a holographic optical element (HOE) at a location on the respective projection surface to reflect a projected image for a select interpupillary distance (IPD) when the respective projection surface is received in the frame, each HOE different in location and/or optical characteristics compared to the other HOEs; and
a projection system coupled to the frame, the projection system comprising:
a projector to project light onto a first select one of the plurality of projection surfaces received in the frame: and
a controller to receive an information element including an indication of an IPD of a user, determine a location of the HOE of the select one of the plurality of projection surfaces based on the indication of the IPD of the user, and send a control signal to the projector to cause the projector to project an image in onto the location of the HOE of the select one of the projection surfaces.
2. The system of claim 1 , wherein the location of each HOE when the respective projection surface is received in the frame is offset in at least one of a horizontal direction relative to the projection system and a vertical direction relative to the projection system compared to the other HOEs when their respective projection surfaces are received in the frame.
3. The system of claim 1 , wherein the projection surface is a glasses lens, a goggle lens, or a helmet visor and wherein the frame is glasses, goggles, or a helmet.
4. The system of claim 1 , comprising a battery electrically coupled to the projector.
5. The system of claim 1 , comprising a graphic processor to receive an image information element to include an indication of the image and to send a display control signal to the projector to cause the projector to project one or more pixels corresponding to the image.
6. The system of claim 1 , wherein each of the plurality of projection surfaces includes at least one of an RFID emitter, an electrical contact, and a reflective element to provide the information element to the controller.
7. A method to project a virtual image, the method comprising:
receiving an information element including an indication of an interpupillarv distance (IPD) of a user;
determining a location of a holographic optical element (HOE) on a projection surface removably received in a frame based on the received indication of the IPD of the user;
sending a control signal to a projector coupled to the frame to project an image onto the location of the HOE;
projecting an the image onto the location of the HOE in response to the control signal;
reflecting the image from the HOE to an exit pupil; and
selecting the projection surface from a plurality of projection surfaces removably receivable within the frame, each of the plurality of projection surfaces comprising a HOE at a location on the respective projection surface is received in the frame, each HOE different in location and/or optical characteristics compared to the other HOEs.
8. The method of claim 7 , comprising:
emitting the light beam from a light source;
receiving the light beam at a mirror; and
rotating the mirror to scan the light beam onto the projection surface.
9. The method of claim 8 , comprising sending a control signal to at least one of the light source and the mirror to cause an image to be projected in the location of the HOE.
10. The method of claim 7 , wherein receiving the information element comprises receiving the information element from the projection surface.
11. The method of claim 7 , wherein receiving the information element comprises receiving the information element from the frame.
12. The method of claim 7 , wherein receiving the information element comprises receiving the information element from an external device.