Wearable near-to-eye vision systems

A near-to-eye (NR2I) head-mounted display (HMD) comprising:

• a processor for executing software comprising instructions stored upon one or more non-volatile, non-transitory storage media;
• wherein
• the software when executed by the processor comprises:
• an operating system layer;
• an HMD-specific service layer comprising a plurality of HMD-specific services;
• and
• an HMD application-layer comprising a plurality of HMD applications;
• wherein
• the HMD-specific service layer provides the plurality of HMD-specific services to the plurality of HMD applications via one or more application programming interfaces;
• and
• each HMD application of the plurality of HMD applications is isolated from the remaining HMD applications of the plurality of HMD applications;
• and
• each HMD application of the plurality of HMD applications is isolated from the plurality of HMD-specific services.

A near-to-eye (NR2I) head-mounted display (HMD) system comprising:

• a frame configured to encompass a head of a user;
• a first temple arm attached at a first end to a first side of the frame and configured to project forward along a first side of the head of the user;
• a second temple arm attached at a first end to a second side of the frame opposite the first side of the frame and configured to project forward along a second side of the head of the user opposite to the first side of the head of the user;
• a display assembly attached at a first location to a second distal end of the first temple arm with a first universal joint and at a second location to a second distal end of the second temple arm with a second universal joint;
• wherein
• each of the first universal joint and the second universal joint are located proximal a first temple and a second temple of the user respectively when worn by the user;
• and
• a battery housing configured to house a removable battery which provides electrical power to the NR2I HMD;
• and
• the removable battery which comprises one or more cells for storing electrical charge, an audiovisual output element, a processor and an inertial sensor;
• and
• the processor upon determining motion of the removable battery through measurements acquired from the inertial sensor generates an audiovisual output with the output element in dependence upon a state of charge of the one or more cells established by the processor.