SENSOR PIXEL CIRCUITRY FOR FINGERPRINT IDENTIFICATION

摘要

In one aspect, a fingerprint sensor device for fingerprint detection includes an array of sensor pixels to capacitively couple with a touched portion of a finger to form an array of fingerprint associated capacitors having capacitive values indicative of a fingerprint. Each sensor pixel includes an output terminal configured to output an output signal that indicates a local capacitive coupling with the touched portion of the finger as part of fingerprint data for fingerprint detection; a capacitive sensing layer including an electrically conductive material that can be capacitively coupled to a local part of the touched portion of the finger, forming a fingerprint associated capacitor, the capacitive sensing layer operable to be coupled to the output terminal to cause the output signal; an integrated circuit layout layer that is electrically conductive; a fingerprint voltage generator; and a layout voltage generator.

主权项

1. A fingerprint sensor device for fingerprint detection, comprising:
an array of sensor pixels configured to capacitively couple with a touched portion of a finger to form an array of fingerprint associated capacitors having capacitive values indicative of a fingerprint, each sensor pixel including:
an output terminal configured to output an output signal that indicates a local capacitive coupling with the touched portion of the finger as part of fingerprint data for fingerprint detection;a capacitive sensing layer including an electrically conductive material that can be capacitively coupled to a local part of the touched portion of the finger, forming a fingerprint associated capacitor, the capacitive sensing layer operable to be coupled to the output terminal to cause the output signal;an integrated circuit layout layer that is electrically conductive and is capacitively coupled to a ground terminal, forming a layout associated capacitor, the layout layer operable to be coupled to the output terminal;a fingerprint voltage generator electrically coupled to supply power to the capacitive sensing layer to generate a fingerprint voltage to charge the fingerprint associated capacitor; anda layout voltage generator electrically coupled to supply power to the integrated circuit layout layer to generate a layout voltage to charge the layout associated capacitor.