Facial Expression Control System for Head-Mountable Devices

An electronic device comprising:

• a head-wearable frame comprising:
• (a) a plurality of light-emitting components, wherein said light-emitting components are configured to illuminate eye areas of a user's face;
• (b) a first sensor assembly attached to a part of the frame, wherein said first sensor assembly is configured for imaging an eye area on a left side of said user's face;
• (c) a second sensor assembly attached to a part of the frame, wherein said second sensor assembly is configured for imaging an eye area on a right side of said user's face;
• (d) a display, operative to render a graphical user interface;
• and
• (e) a processor operative to:
• (i) receive eye tracking data relating to eye movements of said user;
• (ii) receive first sensor data from said first sensor assembly and second sensor data from said second sensor assembly;
• (iii) derive eye openness data for each eye from the first sensor data and the second sensor data, wherein said eye openness data is derived from measuring distances or angles between a plurality of reference points located on said eye areas, wherein at least one of said reference points is situated on a lower eyelid and wherein at least one of said reference points is situated on an upper eyelid;
• and
• (iv) cause a change in the graphical user interface, wherein said change is triggered by a facial expression of said user and wherein causing said change is conditional, at least in part, on said eye tracking data and said eye openness data.