Systems and methods for automatic adjustment of head mounted display straps

1. A head mounted display, comprising:

a display device;

at least one eye tracking sensor disposed in the display device;

a plurality of straps coupled to the display device;

a plurality of pressure sensors associated with the plurality of straps;

at least one adjustment actuator coupled to the plurality of straps; and

a controller configured to:

monitor eye location data using the at least one eye tracking sensor;

record the monitored eye location data as accepted eye location data in user fit information associated with a user of the head mounted display;

capture strap pressure data and strap position data for the plurality of straps;

store one or more of the captured strap pressure data and the captured strap position data in the user fit information as accepted strap pressure data and accepted strap position data associated with the recorded eye location data;

monitor strap pressure data associated with the plurality of straps using the plurality of pressure sensors; and

adjust a position of one or more straps of the plurality of straps using the at least one adjustment actuator based on one or more of the monitored strap pressure data, the accepted strap pressure data stored in the user fit information, the accepted strap position data of the plurality of straps and the accepted eye location data of the user fit information associated with the recorded eye location data.

2. The head mounted display of claim 1 , wherein the controller is configured to:

direct the user to move the display device to achieve the desired image being displayed on the display device;

adjust the position of one or more straps of the plurality of straps using the at least one adjustment actuator to achieve an accepted fit of the head mounted display on the user based on the monitored strap pressure data; and

record the monitored eye location data, the monitored strap pressure data, and the adjusted strap position data of each strap at the accepted eye location data, the accepted strap pressure data, and the accepted strap position data of each strap respectively of the user fit information associated with the user.

3. The head mounted display of claim 1 , wherein the plurality of straps comprises:

a crown strap coupled to the display device proximate a top center portion of the display device;

a first temple strap coupled to the display device proximate a first side portion of the display device; and

a second temple strap coupled to the display device proximate a second side portion of the display device opposite the first side portion of the display device, wherein the second temple strap is coupled to the crown temple strap and the first temple strap,

wherein the monitored strap pressure data is determined based on pressure sensor data from the plurality of pressure sensors and strap position data for the crown strap, the first temple strap and the second temple strap.

4. The head mounted display of claim 1 , wherein:

an image being displayed on the display device includes an alignment crosshair and an alignment marker associated with a respective eye of the at least one eye of the user, and

wherein a desired image is achieved when the alignment marker is aligned with the alignment crosshair associated with the respective eye.

5. The head mounted display of claim 1 , wherein:

the head mounted display further comprises:

a plurality of strap position sensors, each of the plurality of strap position sensors associated with a respective strap of the plurality of straps, and

the controller is configured to:

monitor strap position data of each respective strap of the plurality of straps using each of the plurality of strap position sensors, and

command the at least one adjustment actuator to adjust the position of a respective strap of the plurality of straps based on the strap position data.

6. The head mounted display of claim 1 , wherein the controller is configured to:

monitor context information associated with the head mounted display;

when the monitored context information indicates that the accepted fit of the head mounted display on the user is to be changed, adjust the position of one or more straps of the plurality of straps using the at least one adjustment actuator to achieve an updated fit of the head mounted display based on the monitored strap pressure data and the monitored context information,

wherein the updated fit is within an operational range of the head mounted display that is greater than or equal to a loose fit threshold and less than or equal to a tight fit threshold.

7. The head mounted display of claim 6 , wherein:

the monitored context information indicates that the accepted fit of the head mounted display on the user is to be changed based on one or more of determining that movement of the head mounted display has exceeded a high movement change threshold, determining that movement of the head mounted display has decreased below a low movement change threshold, receiving an activity indicator that indicates that that movement of the head mounted display is about to exceed the high movement change threshold, the motion sensor indicating that movement of the head mounted display is about to decrease below the low movement change threshold, and the monitored strap pressure data indicating that the desired fit of the head mounted display on the user has changed such that the desired fit is outside the operational range of the head mounted display.

8. The head mounted display of claim 1 , wherein the controller is configured to:

authenticate the user using an authentication process and one or more authentication devices coupled to the head mounted display,

wherein the authentication process comprises one or more of IRIS recognition, facial recognition, finger recognition, retina recognition, voice recognition, username and password verification, and

wherein identification of the user fit information associated with the user of the head mounted display is based on the authentication process.

9. The head mounted display of claim 1 , wherein the controller is configured to:

command the at least one adjustment actuator to adjust the position of at least one strap of the plurality of straps based on at least one of a hand gesture by the user, a head gesture by the user, a voice command by the user, and adjustment input provided by an adjustment input device of the head mounted display initiated by the user.

10. The head mounted display of claim 1 , wherein the at least one adjustment actuator comprises:

a drive pinion;

a drive stepper motor coupled to the drive pinion; and

a drive rack coupled to the drive pinion, the drive rack disposed in at least one strap of the plurality of straps,

wherein the at least one adjustment actuator is configured to:

rotate, using the drive stepper motor, the drive pinion in a first rotational direction to cause the drive pinion to move in a first direction along the drive rack to tighten the at least one strap to increase the pressure of the at least one strap to achieve the accepted fit of the head mounted display; and

rotate, using the drive stepper motor, the drive pinion in a second rotational direction to cause the drive pinion to move in a second direction along the drive rack to loosen the at least one strap to decrease the pressure of the at least one strap to achieve the accepted fit of the head mounted display, and wherein the second rotational direction is opposite the first rotational direction and the second direction is opposite the first direction.

11. A method for automatically adjusting one or more straps in a plurality of straps coupled to a head mounted display, the head mounted display comprising a display device, an eye tracking sensor, a plurality of pressure sensors located around the display device, a plurality of strap position sensors and at least one adjustment actuator, the method comprising:

monitoring, by a controller, eye location data using the eye tracking sensor disposed in the display device;

recording the monitored eye location data in user fit information associated with a user of the head mounted display;

capturing strap pressure data and strap position data for the plurality of straps;

storing one or more of the captured strap pressure data and the captured strap position data in user fit information as accepted strap pressure data and accepted strap position data associated with the recorded eye location data;

monitoring, by the controller, strap pressure data associated with the plurality of straps; and

commanding, by the controller, at least one adjustment actuator to adjust a position of at least one strap of the plurality of straps to achieve a desired fit of the head mounted display on the user based on the monitored strap pressure data, the captured strap pressure data, and the accepted strap position data of each strap of the user fit information.

12. The method of claim 11 , wherein the method further comprises:

adjusting the strap position of one or more straps of the plurality of straps using the at least one adjustment actuator to achieve an accepted fit of the head mounted display on the user based on the monitored strap pressure data; and

recording the monitored eye location data, the monitored strap pressure data, and the adjusted strap position data of each strap associated with the accepted eye location data, the accepted strap pressure data, and the accepted strap position data of each strap respectively of the user fit information associated with the user.

13. The method of claim 11 , wherein the plurality of straps comprises:

a crown strap including a first end and a second end, the second end of the crown strap coupled to the display device proximate a top center portion of the display device;

a first temple strap including a first end and a second end, the first end of the first temple strap coupled to the display device proximate a first side portion of the display device; and

a second temple strap including a first end and a second end, the first end of the second temple strap coupled to the display device proximate a second side portion of the display device opposite the first side portion of the display device, and the second end of the second temple strap coupled to the second end of the crown temple strap and the second end of the first temple strap,

wherein the monitored strap pressure data is determined based on pressure sensor data from the plurality of pressure sensors and strap position data for the crown strap, the first temple strap and the second temple strap.

14. The method of claim 11 , wherein:

an image being displayed on the display device includes an alignment crosshair and an alignment marker associated with a respective eye of the at least one eye of the user, and

wherein a desired image is achieved when the alignment marker is aligned with the alignment crosshair associated with the respective eye.

15. The method of claim 11 , wherein the method further comprises:

monitoring strap position data of each respective strap of the plurality of straps using each of a plurality of strap position sensors of the head mounted display, wherein each of the plurality of strap position sensors associated with a respective strap of the plurality of straps, and

adjusting the position of a respective strap of the plurality of straps based on the strap position data of the respective strap of the plurality of straps.

16. The method of claim 11 , wherein the method further comprises:

monitoring context information associated with the head mounted display;

when the monitored context information indicates that the accepted fit of the head mounted display on the user is to be changed, adjusting the position of each strap of the plurality of straps using the at least one adjustment actuator to achieve an updated fit of the head mounted display based on the monitored strap pressure data and the monitored context information,

wherein the updated fit is within an operational range of the head mounted display that is greater than or equal to a loose fit threshold and less than or equal to a tight fit threshold.

17. The method of claim 16 , wherein:

the monitored context information indicates that the accepted fit of the head mounted display on the user is to be changed is based on one or more of a motion sensor of the head mounted display detects that movement of the head mounted display has exceeded a high movement change threshold, the motion sensor detects that movement of the head mounted display has decreased below a low movement change threshold, an activity indicator is received that indicates that that movement of the head mounted display is to exceed the high movement change threshold, the motion sensor indicates that movement of the head mounted display is to decrease below the low movement change threshold, and the monitored strap pressure data indicates that the desired fit of the head mounted display on the user has changed such that the desired fit is outside the operational range of the head mounted display.

18. The method of claim 11 , wherein the method further comprises:

authenticating the user using an authentication process and one or more authentication devices coupled to the head mounted display,

wherein the authentication process comprises one or more of IRIS recognition, facial recognition, finger recognition, retina recognition, voice recognition, username and password verification, and

wherein the identification of the user fit information associated with the user of the head mounted display is based on the authentication process.

19. The method of claim 11 , wherein:

commanding the at least one adjustment of actuator to adjust the position of at least one strap of the plurality of straps based on at least one of a hand gesture by the user, a head gesture by the user, a voice command by the user, and adjustment input provided by an adjustment input device of the head mounted display initiated by the user.

20. The method of claim 11 , wherein the method comprises:

rotating, by a drive stepper motor of the at least one adjustment actuator, a drive pinion of the at least one adjustment actuator in a first rotational direction causing the drive pinion to move in a first direction along a drive rack of the at least one adjustment actuator tightening each strap; and

rotating, by the drive stepper motor, the drive pinion in a second rotational direction causing the drive pinion to move in a second direction along the drive rack loosening each strap, and wherein the second rotational direction is opposite the first rotational direction and the second direction is opposite the first direction.