a sensing signal input amplifying unit including a first transistor, wherein a gate and a drain of the first transistor are connected with a sensor; and

a signal reading unit, which is connected with a source of the first transistor,

wherein the first transistor is turned on when the sensor generates a sensing signal, and the sensing signal is captured by the signal reading unit,

wherein the signal reading unit comprises a second transistor and a first capacitor, and

wherein a drain of the second transistor is connected with the source of the first transistor, the drain of the second transistor is grounded via the first capacitor, a gate of the second transistor is used to receive a scanning signal, and a source of the second transistor is connected with a signal output unit.