FINGERPRINT DETECTION CIRCUIT AND CAPACITIVE FINGERPRINT SENSOR THEREOF AND MOBILE TERMINAL

摘要

The present invention includes a plurality of detection units arranged in an array, further comprising a summing unit, wherein the detection unit comprises a first detection unit and a second detection unit, wherein the first detection unit and the second detection unit Are respectively connected to the summing unit, and the summing unit sums up the output signal of each second detection unit and the output signal of the first detection unit to remove the base signal in the output signal of each second detection unit, A fingerprint detection circuit for acquiring a useful signal including fingerprint information is disclosed. The fingerprint detection circuit disclosed in the present invention selects at least one detection unit as an offset unit, calculates and calculates the sum of the output signal of the other detection unit and the output signal of the detection unit, and calculates the basis signal in the output signal of the detection unit. By removing, a useful signal including fingerprint information is obtained. Compared with the prior art, it improves the elimination of the base signal and further improves the fingerprint recognition accuracy.