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Piezoelectric fingerprint sensor has pressure area on upper electrode that causes charge variation in piezoelectric membrane under pressure effect of contact with fingerprint
Piezoelectric fingerprint sensor has pressure area on upper electrode that causes charge variation in piezoelectric membrane under pressure effect of contact with fingerprint
The device has a substrate (31), a lower electrode (34) on the substrate, a piezoelectric membrane (35) on the lower electrode, an upper electrode (36) on the membrane, a pressure area (38) on the upper electrode that causes a charge variation in the piezoelectric membrane under the pressure effect of contact with a fingerprint and a non-conducting layer (37) for carrying the pressure area above the lower electrode in an exposed manner.
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