Modular accessories for head-mountable device

1. A retention system for use with a personal display module that includes a display unit configured to present information to a user via a display mounted thereon, a housing unit remote from the display, and a connecting member extending at least partially between the housing unit and the display and including a first attachment structure and a first conductive contact, the retention system comprising:

a center support of a viewing portion of the retention system;

a first side arm extending from the center support on a first side thereof;

a second side arm extending from the center support on a second side thereof, the first and second side arms on opposing sides of the center support;

an attachment arm extending from the center support on the second side thereof, the attachment arm including a second attachment structure configured to releasably attach with the first attachment structure of the personal display module, the attachment arm further including a second conductive contact that is positioned to engage with the first conductive contact of the personal display module; and

a component module disposed on the first side arm and containing a first electronic component that is electrically connected with the second conductive contact through a portion of the first side arm, the center support, and a portion of the second side arm,

wherein releasable attachment between the first attachment structure and the second attachment structure removably secures the retention system to the display module such that a resulting assembly is wearable on a head of the user with the display of the display module positioned adjacent an eye of the user and such that the first electronic component is electrically connected with the display module by engagement between the first and second conductive contacts.

2. The retention system of claim 1 , wherein the first side arm, center support, and attachment arm are portions of a band configured to continuously extend a general “U” shape.

3. The retention system of claim 1 , wherein the component module is removably attached with the first side arm by mating first and second attachment portions defined respectively on the first side arm and on the component module, and wherein electrical connection is made by third and fourth conductive contacts within the first and second attachment portions, respectively.

4. The retention system of claim 1 , wherein the component module includes a first housing configured to be disposed on a first side of a ear of the user when being worn, the component module further including a second housing configured to be disposed on a second side of the ear of the user when the assembly of the retention system and the display module is worn by the user.

5. The retention system of claim 4 , wherein the component module further includes a connector arm extending between the first and second housings, and wherein the second attachment structure is on the connector arm.

6. The retention system of claim 5 , wherein the component module is releasably attachable with a first side arm channel defined on the first side arm and a projection extending from the attachment arm that is configured to maintain a snap-fit attachment with the channel.

7. The retention system of claim 6 , wherein the component module a third conductive contact on the projection of the component module to engage with a fourth conductive contact within the first side arm channel.

8. The retention system of claim 1 , wherein the first electronic component is one of a battery, cellular communication circuitry, WiFi communication circuitry, a computer processor, or memory.

9. The retention system of claim 1 , wherein the first electronic component is a battery, the component module further including a second electronic component that includes communications circuitry.

10. The retention system of claim 1 , wherein the component module is configured to be a first weight that is approximately equal to a second weight of the housing unit, a similar shape as the housing unit, and laterally aligned with an end of the housing unit when the resulting assembly is worn on the head of the user.

11. The retention system of claim 1 , wherein the component module comprises:

a third attachment structure configured to removably attach the component module with a portion of the first side arm, the first attachment structure having a proximal end and a distal end;

a component housing unit including the first electronic component therein, the component housing unit having a proximal end adjacent to the distal end of the first attachment structure and a distal end; and

a wiring component in communication with the first electronic component, the wiring component having a proximal end adjacent to the distal end of the component housing unit and a distal end configured to attach with the personal display module.

12. A retention system for use with a personal display module that includes a display unit configured to present information to a user via a display mounted thereon, a housing unit remote from the display, and a connecting member extending at least partially between the housing unit and the display and including a first attachment structure, the retention system comprising:

a center support of a viewing portion of the retention system;

a first side arm extending from the center support on a first side thereof;

a second side arm extending from the center support on a second side thereof, the first and second side arms on opposing sides of the center support;

an attachment arm extending from the center support on the second side thereof, the attachment arm including a second attachment structure configured to releasably attach with the first attachment structure of the personal display module; and

a component module disposed on the first side arm comprising:

a third attachment structure configured to removably attach the component module with a portion of the first side arm, the first attachment structure having a proximal end and a distal end,

a component housing unit including a first electronic component therein, the component housing unit having a proximal end adjacent to the distal end of the first attachment structure and a distal end, and

a wiring component in communication with the first electronic component, the wiring component having a proximal end adjacent to the distal end of the component housing unit and a distal end configured to attach with the personal display module,

wherein releasable attachment between the first attachment structure and the second attachment structure removably secures the retention system to the display module such that a resulting assembly is wearable on a head of the user with the display of the display module positioned adjacent an eye of the user.

13. The retention system of claim 12 , wherein the first side arm, center support, and attachment arm are portions of a band configured to continuously extend a general “U” shape.

14. The retention system of claim 12 , wherein the component module is removably attached with the first side arm by mating first and second attachment portions defined respectively on the first side arm and on the component housing.

15. The retention system of claim 12 , wherein the component housing unit includes a first housing configured to be disposed on a first side of an ear of the user when being worn, the component housing unit further including a second housing configured to be disposed on a second side of the ear of the user when the assembly of the retention system and the display module is worn by the user.

16. The retention system of claim 15 , wherein the component module further includes a connector arm extending between the first and second housings, and wherein the second attachment structure is on the connector arm.

17. The retention system of claim 16 , wherein the component module is releasably attachable with a first side arm channel defined on the first side arm and a projection extending from the attachment arm that is configured to maintain a snap-fit attachment with the channel.

18. The retention system of claim 12 , wherein the first electronic component is one of a battery, cellular communication circuitry, WiFi communication circuitry, a computer processor, or memory.

19. The retention system of claim 12 , wherein the first electronic component is a battery, the component module further including a second electronic component that includes communications circuitry.

20. The retention system of claim 12 , wherein the component module is configured to be a first weight that is approximately equal to a second weight of the housing unit, a similar shape as the housing unit, and laterally aligned with an end of the housing unit when the resulting assembly is worn on the head of the user.