Fingerprint identification circuit, touch apparatus and fingerprint identification method

A fingerprint identification circuit, comprising a plurality of reading sub-circuits, and a plurality of fingerprint identification sub-circuits arranged in rows and columns, wherein each column of fingerprint identification sub-circuits are connected with one of the reading sub-circuits, each of the fingerprint identification sub-circuits comprises a writing sub-circuit, a sensing sub-circuit and a output sub-circuit connected in sequence, a control terminal of the writing sub-circuit is connected with a scan signal input terminal and is turned on upon an active signal is input to the scan signal input terminal so as to write a detection signal to the sensing sub-circuit;

• the sensing sub-circuit senses a fingerprint and transmits an obtained sensing signal to the output sub-circuit, the output sub-circuit is turned on and outputs the sensing signal upon the writing sub-circuit is turned off, and is turned off upon the writing sub-circuit is turned on, and wherein each of the fingerprint identification sub-circuits further comprising:
• a converting and amplifying sub-circuit, which is provided between the sensing sub-circuit and the output sub-circuit, for converting the sensing signal output from the sensing sub-circuit into a current signal, amplifying the current signal by a preset multiple and then outputting it to the output sub-circuit, wherein
• the reading sub-circuit is connected with an output terminal of the output sub-circuit, and is configured to read the sensing signal output from the output sub-circuit and convert the current signal into a voltage signal to output.