Display apparatus and method incorporating adaptive pose locking

A display apparatus comprising:

• pose-tracking means;
• an image renderer per eye;
• a liquid-crystal device comprising a liquid-crystal structure and a control circuit, wherein the liquid-crystal structure is arranged in front of an image-rendering surface of the image renderer;
• and
• at least one processor configured to:
• process pose-tracking data, collected by the pose-tracking means, to determine a head pose of a user;
• detect whether or not a rate at which the head pose of the user is changing is below a predefined threshold rate;
• when it is detected that the rate is below the predefined threshold rate, switch on a lock mode of the display apparatus, select a given head pose of the user for a given session of the lock mode, and generate a sequence of output image frames according to the given head pose during the given session of the lock mode;
• when it is detected that the rate is not below the predefined threshold rate, generate the sequence of output image frames according to corresponding head poses of the user as determined from the pose-tracking data;
• and
• display the sequence of output image frames via the image renderer, whilst controlling the liquid-crystal structure, via the control circuit, to shift light emanating from a given pixel of the image renderer to a plurality of positions in a sequential and repeated manner, wherein a shift in the light emanating from the given pixel of the image renderer to the plurality of positions causes a resolution of the output image frames to appear higher than a display resolution of the image renderer;
• wherein the at least one processor is further configured to:
• detect, after the lock mode is switched on, whether or not the rate at which the head pose of the user is changing exceeds the predefined threshold rate;
• and
• when it is detected, after the lock mode is switched on, that the rate exceeds the predefined threshold rate, switch off the lock mode of the display apparatus;
• wherein the given head pose of the user is selected for the given session of the lock mode by employing a low-pass filter to filter out changes in the head pose of the user, and wherein the at least one processor is configured to loosen the low-pass filter over a second time period prior to ending the given session of the lock mode.