Electronic device for reducing output variation factors of pixel circuits

An electronic device, comprising:

• a plurality of sensing pixel circuits, wherein at least one of the sensing pixel circuits comprises:
• a photoelectric sensing element, comprising a first end and a second end, wherein the second end of the photoelectric sensing element is coupled to a bias voltage;
• a first transistor device, comprising a first end, a second end and a control end, wherein the control end of the first transistor device is coupled to a first scan line;
• a second transistor device, comprising a first end, a second end and a control end, wherein the first end of the second transistor device is coupled to an operation voltage, the second end of the second transistor device is coupled to the first end of the first transistor device, and the control end of the second transistor device is coupled to the first end of the photoelectric sensing element;
• a third transistor device, comprising a first end, a second end and a control end, wherein the first end of the third transistor device is coupled to a reset voltage, the second end of the third transistor device is coupled to the first end of the photoelectric sensing element, and the control end of the third transistor device is coupled to a reset line;
• and
• a fourth transistor device, comprising a first end, a second end and a control end, wherein the first end of the fourth transistor device is coupled to the first end of the first transistor device, the second end of the fourth transistor device is coupled to the bias voltage, and the control end of the fourth transistor device is coupled to a second scan line, wherein in a pre-trap period, a first current flows through the second transistor device and the fourth transistor device from the operation voltage to the bias voltage, wherein in a first period, a second current flows to one of a plurality of current sources, and the first current is larger than the second current, wherein the pre-trap period precedes the first period.