Systems and methods for temporarily disabling user control interfaces during attachment of an electronic device

1. A head-mounted display system configured to project light to an eye of a user to display augmented reality image content in a vision field of said user, said head-mounted display system comprising:

a frame configured to be supported on a head of a user;

a display coupled to the frame, said display configured to project light into said user's eye to display augmented reality image content to the user's vision field; and

an electronic device configured to be attached to a portion of a user's clothing or accessory, the electronic device being remote from the frame, the electronic device comprising:

a housing comprising a first portion and a second portion separated from the first portion by a first gap, the first portion comprising a first projection extending into the first gap and being separated from the second portion by a second gap, said housing further comprising a connecting region joining the first portion and the second portion, the electronic device being configured to be attached to a portion of the user's clothing or accessory by inserting a portion of the user's clothing or accessory through the second gap between the first projection and the second portion;

an electrical power supply supported by the housing and configured to provide power to the display;

one or more user control interfaces disposed on the housing, the one or more user control interfaces configured to control a parameter of the head-mounted display system; and

a strain gauge disposed in or near the connecting region, the strain gauge configured to detect a change in strain of the connecting region caused by a change in a size of the second gap,

wherein an electronic control system of the electronic device is configured to temporarily disable the one or more user control interfaces in response to the strain gauge detecting a strain in the connecting region.

2. The head mounted display system of claim 1 , wherein the parameter comprises at least one of volume, brightness, contrast or color.

3. The head-mounted display system of claim 1 , wherein the first portion comprises one or more electronic components and the second portion comprises an electrical power supply system.

4. The head-mounted display system of claim 1 , further comprising a proximity sensor disposed in the first gap, the proximity sensor configured to detect presence of an object in the first gap.

5. The head-mounted display system of claim 4 , wherein the proximity sensor comprises an infrared (IR) light emitter configured to emit IR light and an IR sensor configured to detect IR light reflected from the object in the first gap.

6. The head-mounted display system of claim 4 , wherein the electronic control system is configured to temporarily disable the one or more user control interfaces in response to the proximity sensor detecting the presence of the object in the first gap.

7. The head-mounted display system of claim 1 , further comprising a magnetic sensor disposed in the first or second portion and a magnet disposed in the second or first portion.

8. The head-mounted display system of claim 7 , wherein the electronic control system is configured to temporarily disable the one or more user control interfaces in response to the magnetic sensor detecting a change in magnetic field strength caused by a change in the size of the second gap as the electronic device is in the process of being attached to a portion of the user's clothing or accessory.

9. The head-mounted display system of claim 1 , further comprising a light sensor disposed in the first gap, the light sensor configured to detect an amount of light in the first gap.

10. The head-mounted display system of claim 9 , wherein the electronic control system is configured to temporarily disable the one or more user control interfaces in response to the light sensor detecting that the amount of light in the first gap is below a threshold level.

11. The head-mounted display system of claim 1 , further comprising one or more inertial measurement units configured to detect a change in orientation, an acceleration or a movement of the electronic device.

12. The head-mounted display system of claim 11 , wherein the electronic control system is configured to temporarily disable the one or more user control interfaces in response to the one or more inertial measurement units detecting that the change in the orientation, acceleration or movement of the electronic device indicates that the electronic device is grasped and picked up by the user for attaching to a portion of the user's clothing or accessory.

13. The head-mounted display system of claim 1 , wherein the electronic device comprises a sensor configured to provide information based on which the electronic control system can determine either (a) that the electronic device has been attached to the portion of the user's clothing or accessory or (b) or that the electronic device has almost been attached to the portion of the user's clothing or accessory, or (c) both (a) and (b), and wherein the electronic control system can activate the one or more user control interfaces.

14. The head mounted display system of claim 1 , wherein the electronic control system is configured to activate the one or more user control interfaces in response to detecting that the electronic device is attached to a portion of the user's clothing or accessory.

15. The head-mounted display system of claim 1 , wherein the housing is connected to the frame by a wire.

16. The head-mounted display system of claim 1 , further comprising an input device including an input device housing separate from the housing, the input device comprising an additional one or more user control interfaces supported by the input device housing and configured to control an additional parameter of the head-mounted display system, the additional parameter including a parameter of a virtual user interface provided by the display.

17. The head-mounted display system of claim 1 , further comprising a second projection extending from the second portion into the first gap, the first projection and the second projection being separated by the second gap.

18. The head-mounted display system of claim 17 , wherein the first projection and the second projection form a clip.

19. A method of disabling one or more user control interfaces disposed on a wearable electronic device when the wearable electronic device is in the process of being attached to a portion of a user's clothing or accessory, the wearable electronic device comprising a housing comprising a first portion and a second portion separated from the first portion by a first gap, the first portion comprising a projection extending into the first gap and being separated from the second portion by a second gap, said housing further comprising a connecting region joining the first portion and the second portion, the wearable electronic device being configured to be attached to a portion of the user's clothing or accessory by inserting a portion of the user's clothing or accessory through the second gap between the projection and the second portion, the method comprising:

by the wearable electronic device, providing power to a display of a head-mounted system;

detecting a change in strain of the connecting region with a strain gauge disposed in or near the connecting region, the change in strain caused by a change in a size of the second gap;

determining, using an electronic processor, that the change in strain of the connecting region indicates that the wearable electronic device is in the process of being attached to a portion of the user's clothing or accessory; and

temporarily disabling the one or more user control interfaces using an electronic control system in response to determining that the wearable electronic device is in the process of being attached to a portion of the user's clothing or accessory.

20. The method of claim 19 , further comprising activating the one or more user control interfaces in response to determining that the wearable electronic device is attached to a portion of the user's clothing or accessory.