Head mounted display with deformation sensors

A binocular head mounted display comprising:

• a frame for wearing on a head of a user;
• right and left displays for displaying right and left images to the user, wherein the left and right displays are mounted to the frame;
• a first deformation sensor disposed in or on the frame to measure rotational deformation of the frame about a first rotational axis that causes the right and left displays to change alignment relative to each other;
• and
• a second deformation sensor disposed in or on the frame to measure a torsional deformation of the frame about a second rotational axis different than the first rotational axis that also causes the right and left displays to change alignment relative to each other.

A method to provide tracking of deformation of a binocular head mounted display (“HMD”), the method comprising:

• monitoring a first rotational deformation of a frame of the binocular HMD about a first rotational axis passing through a central region of the frame between right and left displays of the binocular HMD, wherein the monitoring of the first rotational deformation is performed by a first sensor system disposed in or on the binocular HMD;
• monitoring a second rotational deformation of the frame about a second rotational axis passing through the central region, wherein the second rotational axis is different than the first rotational axis, wherein the monitoring of the second rotational deformation is performed by a second sensor system disposed in or on the binocular HMD;
• generating a first signal by the first sensor system indicative of the first rotational deformation of the frame;
• and
• generating a second signal by the second sensor system indicative of the second rotational deformation of the frame,
• wherein the first and second rotational deformations cause the right and left displays of the binocular HMD to change alignment relative to each other.

A binocular head mounted display (“HMD”), comprising:

• a frame;
• right and left displays mounted to the frame;
• first and second sensor systems disposed in or on the frame;
• and
• a control system disposed in or on the frame and coupled to the first and second sensor systems, the control system including logic that, when executed, causes the control system to perform operations comprising:
• monitoring a first rotational deformation of the frame about a first rotational axis passing through a central region of the frame between the right and left displays based on a first output from the first sensor system;
• and
• monitoring a second rotational deformation of the frame about a second rotational axis passing through the central region based on second outputs from the second sensor system, wherein the second rotational axis is different than the first rotational axis.