Patent ID: 11816279

Abstract:
It is an object to provide a device for piezoelectric sensing. According to an embodiment, a device comprises a touch surface, a plurality of piezoelectric sensors, wherein the plurality of piezoelectric sensors includes at least a first subset of piezoelectric sensors and a second subset of piezoelectric sensors, and a wakeup circuitry. The wakeup circuitry may be configured to: obtain the electrical signal from each piezoelectric sensor in the plurality of piezoelectric sensors; assign a positive sign to electrical signals obtained from the first subset of piezoelectric sensors and assign a negative sign to electrical signals obtained from the second subset of piezoelectric sensors; produce a sum signal by summing the obtained electrical signals according to the assigned signs; compare the sum signal to a preconfigured condition; and in response to the sum signal fulfilling the preconfigured condition, provide a wakeup signal.