A fingerprint identification system, wherein the fingerprint identification system comprises: a plurality of first pixel circuits, a first pixel circuit in the plurality of first pixel circuits forming a contact capacitance with a finger; a first sensing circuit, coupled to the first pixel circuit, for sensing the contact capacitance and outputting a first output signal, wherein the first output signal contains a first signal component and a second signal component, and the second signal component indicates a change amount of the contact capacitance, and the first signal component comprises a signal component influenced by parasitic capacitance, temperature and/or noise; at least one second pixel circuit; a second sensing circuit, coupled to a second pixel circuit of the at least one second pixel circuit, for outputting a second output signal, wherein the second output signal is equal to the first signal component; and a differential amplifying circuit, coupled to the first sensing circuit and the second sensing circuit, for amplifying a difference value between the first output signal and the second output signal so as to generate an amplifying output signal, wherein the amplifying output signal is an amplified signal of the second signal component; wherein the first pixel circuit comprises: a contact layer for receiving a contact of the finger, the contact layer forming the contact capacitance with the finger, and the contact layer coupled to a driving circuit to receive a second drive signal; and a first shield layer, disposed below the contact layer, and coupled to the driving circuit to receive a third drive signal; wherein the contact layer is coupled to the first sensing circuit; wherein the second pixel circuit comprises: a contact layer, coupled to a first driving circuit to receive a first drive signal (clkl), the contact layer receiving a contact of the finger; a first shield layer, disposed below the contact layer; a first metal layer, disposed below the first shield layer, and coupled to a second driving circuit to receive the second drive signal; and a second metal layer, disposed below the first metal layer, wherein the first shield layer and the second metal layer are coupled to the second driving circuit to receive the third drive signal; wherein the first metal layer is coupled to the second sensing circuit. a plurality of first pixel circuits, a first pixel circuit in the plurality of first pixel circuits forming a contact capacitance with a finger; a first sensing circuit, coupled to the first pixel circuit, for sensing the contact capacitance and outputting a first output signal, wherein the first output signal contains a first signal component and a second signal component, and the second signal component indicates a change amount of the contact capacitance, and the first signal component comprises a signal component influenced by parasitic capacitance, temperature and/or noise; at least one second pixel circuit; a second sensing circuit, coupled to a second pixel circuit of the at least one second pixel circuit, for outputting a second output signal, wherein the second output signal is equal to the first signal component; and a differential amplifying circuit, coupled to the first sensing circuit and the second sensing circuit, for amplifying a difference value between the first output signal and the second output signal so as to generate an amplifying output signal, wherein the amplifying output signal is an amplified signal of the second signal component; wherein the first pixel circuit comprises: a contact layer for receiving a contact of the finger, the contact layer forming the contact capacitance with the finger, and the contact layer coupled to a driving circuit to receive a second drive signal; and a first shield layer, disposed below the contact layer, and coupled to the driving circuit to receive a third drive signal; a contact layer for receiving a contact of the finger, the contact layer forming the contact capacitance with the finger, and the contact layer coupled to a driving circuit to receive a second drive signal; and a first shield layer, disposed below the contact layer, and coupled to the driving circuit to receive a third drive signal; wherein the contact layer is coupled to the first sensing circuit; wherein the second pixel circuit comprises: a contact layer, coupled to a first driving circuit to receive a first drive signal (clkl), the contact layer receiving a contact of the finger; a first shield layer, disposed below the contact layer; a first metal layer, disposed below the first shield layer, and coupled to a second driving circuit to receive the second drive signal; and a second metal layer, disposed below the first metal layer, wherein the first shield layer and the second metal layer are coupled to the second driving circuit to receive the third drive signal; a contact layer, coupled to a first driving circuit to receive a first drive signal (clkl), the contact layer receiving a contact of the finger; a first shield layer, disposed below the contact layer; a first metal layer, disposed below the first shield layer, and coupled to a second driving circuit to receive the second drive signal; and a second metal layer, disposed below the first metal layer, wherein the first shield layer and the second metal layer are coupled to the second driving circuit to receive the third drive signal; wherein the first metal layer is coupled to the second sensing circuit.