CAPACITIVE FINGERPRINT SENSING UNIT CAPACITANCE MEASURING CIRCUIT OF A FINGERPRINT SENSOR AND FINGERPRINT SENSING DEVICE HAVING THE SAME

摘要

Disclosed are a capacitive fingerprint recognition unit for sensing a fingerprint of a user in a capacitive manner using a TFT sensor array, a capacitance measurement circuit of a fingerprint sensor, and a fingerprint recognition device having the capacitive fingerprint recognition unit. The capacitive fingerprint recognition unit comprises: a TFT sensor array including a fingerprint recognition pattern connected to each of a plurality of TFTs; a gate driving unit for sequentially supplying a gate signal to a gate line; an upper switch connected to one end of each of sensing lines for switching a drive signal for fingerprint recognition and an output path of a sensing signal according to fingerprint recognition; and a lower switch connected to the other end of each of sensing lines for switching a drive signal for fingerprint recognition and an output path of a sensing signal according to fingerprint recognition. Accordingly, the fingerprint of the user is sensed in a capacitive manner using the TFT sensor array, and the path of the sensing signal passing through the TFT sensor array is changed from one side of the TFT sensor array to the other side or from the other side or the one side, whereby the error rate of the measured value obtained through the fingerprint sensor can be reduced.