A pixel circuit including an LED, a first internal-node setting transistor, a second internal-node setting transistor, and a light-intensity control transistor is provided. The LED is electrically connected to a supply voltage line and the first internal-node setting transistor. The first internal-node setting transistor is electrically connected a first internal-node. The second internal-node setting transistor is electrically connected to a second internal-node and a data-line. The data-line is equivalent to a pixel-data setting voltage during a pixel-data voltage-setting duration. A pixel current flows through the LED, the first internal-node setting transistor, the first internal-node, and the light-intensity control transistor during a pixel light-emission duration. The pixel current is related to the first and the second internal-nodes during the pixel light-emission duration. The voltage of the second internal-node during the pixel light-emission duration is related to a threshold voltage of the light-intensity control transistor and the pixel-data setting voltage.