Fingerprint detection device and fingerprint detection method

A fingerprint detection device, comprising a detection substrate and a signal converter, wherein the detection substrate comprises a plurality of pixels arranged in a plurality of rows and a plurality of columns, each of the plurality of pixels comprises a sensing circuit configured to receive an optical signal and output a sensing electrical signal according to the received optical signal, and the signal converter comprises a plurality of analog-to-digital converters each coupled to one column of sensing circuits,

• wherein the fingerprint detection device further comprises a control circuit coupled to the sensing circuits and the plurality of analog-to-digital converters and configured to obtain a common mode component of sensing electrical signals output by the sensing circuits of at least part of the plurality of pixels and provide information about the common mode component to the plurality of analog-to-digital converters, and
• the analog-to-digital converter is configured to perform analog-to-digital conversion on a difference between the sensing electrical signal from a corresponding sensing circuit and the common mode component.