Abstract: An active matrix organic light emitting diode display pixel structure. In the pixel structure of the present invention, a switching transistor has a gate terminal coupled to a scan signal and a source terminal coupled to a data signal. A storage capacitor has two terminals coupled to a drain terminal of the first transistor and a reference voltage respectively. An OLED has an anode coupled to a drain terminal of the second transistor and a cathode coupled to a first voltage. A plurality of driving transistors is coupled in cascode, wherein the first terminal of the first diving transistor of the driving transistors is coupled to a second voltage, and a second terminal of the final diving transistor of the driving transistors is coupled to the anode of the OLED, and an equivalent channel width/length (W/L) ratio of the driving transistors does not exceed 0.2.