A pixel unit structure of an organic light emitting diode display panel includes a switch transistor, a storage capacitor configured to receive a discharging reference voltage, an organic light emitting diode, a driving transistor, a first control circuit, and a second control circuit. The organic light emitting diode is controlled by the driving transistor and the first control circuit to emit light. The scan signal, the first control signal, the second control signal, and the discharging reference voltage control the pixel unit to operate in a plurality of time events repeating in sequence.