Patent ID: 7705613

Claim:
A fingerprint sensor, comprising: a capacitive sensor array including: multiple sensor cells; sensor cell circuitry having connection points; and electrically conductive, though-chip vias extending from the connection points for the sensor cell circuitry to a back side of the capacitive sensor array; a chip including: active detection circuitry; and electrical connection points, wherein the electrical connection points of the chip are respectively connected to corresponding ones of the sensor cell circuitry connection points to form an electrical path therebetween; a cover plate positioned above the multiple sensor cells, wherein a spacing from a bottom side of the cover plate to the multiple sensor cells is less than 25 μm; and an interposer located between the capacitive sensor array and the chip, wherein the interposer comprises: rerouting traces disposed on at least one of a top or a bottom surface of the interposer; and a plurality of though vias; wherein at least some of the plurality of though vias are connected to at least some of the though-chip vias of the capacitive sensor array by the rerouting traces and at least some of the plurality of through vias are not aligned with their corresponding though-chip vias.