Ultrasonic sensor array control to facilitate screen protectors

An apparatus comprising:

• an ultrasonic sensor array;
• a platen;
• and
• a controller, wherein the controller is configured to:
• determine whether one or more characteristics of received ultrasonic waves indicate that a first screen protector disposed above the platen has been removed or replaced by a second screen protector;
• and
• recalibrate the ultrasonic sensor array responsive to determining that the one or more characteristics of the received ultrasonic waves indicate that the first screen protector disposed above the platen has been removed or replaced by the second screen protector.

A non-transitory computer readable medium storing program code to be executed by a controller of an apparatus that includes an ultrasonic sensor array disposed under a platen, the program code comprising instructions configured to cause the controller to:

• determine whether one or more characteristics indicate that a first screen protector disposed above the platen has been removed or replaced by a second screen protector, the one or more characteristics including one or more of:
• a platen temperature gradient or a change in touchscreen capacitance;
• and
• recalibrate the ultrasonic sensor array responsive to determining that the one or more characteristics indicate that the first screen protector disposed above the platen has been removed or replaced by the second screen protector.