A pixel circuit includes a selection transistor, a driving transistor, an emissive element, a first capacitor, and a reference transistor. The selection transistor is coupled to a gate line and a data line. A control electrode of the driving transistor is coupled to the selection transistor and a first electrode of the driving transistor is coupled to a power source line. The emissive element emits light according to a current drawn from the driving transistor. The first capacitor is coupled to the driving transistor and an emission signal line. A control electrode of the reference transistor is coupled to a reference signal line providing a selectable voltage with a first predetermined level and a second predetermined level. A first electrode of the reference transistor is coupled to the control electrode of the driving transistor.