A pixel circuit for driving a light emitting device to emit light, characterized in that the pixel circuit comprises: a reference voltage set up sub-circuit, a charging sub-circuit and a driving sub-circuit; the reference voltage set up sub-circuit and the charging sub-circuit being connected with the driving sub-circuit respectively, the reference voltage set up sub-circuit setting up a reference voltage during a first period of time, the charging sub-circuit providing for the driving sub-circuit a data signal voltage required by the drive data signal for controlling the driving during a second period of time; the driving sub-circuit comprising: a driving transistor for driving the light emitting device to emit light, and a first capacitor for maintaining the reference voltage and the data signal voltage, wherein the reference voltage set up sub-circuit is connected to a data line for providing the reference voltage, the reference voltage is a pulse signal, and wherein the charging sub-circuit is connected to the data line for providing the data signal voltage, the data line transmits the reference voltage within the first period of time, and transmits the data signal voltage within the second period of time after the first period of time, the reference voltage set up sub-circuit is connected to a first terminal of the first capacitor to set up the reference voltage during the first period of time and transmit the reference voltage to the first terminal of the first capacitor during the second period of time, and the charging sub-circuit is connected to a second terminal of the first capacitor to provide the data signal voltage at the second terminal of the first capacitor during the second period of time, wherein a gate of the driving transistor is connected with the second terminal of the first capacitor, a source and a drain of the driving transistor are connected with the first reference signal source and an input end of the light emitting device respectively, an output end of the light emitting device is connected with a second reference signal source, wherein the reference voltage set up sub-circuit comprises: a second capacitor, a first switch transistor and a second switch transistor, the two terminals of the second capacitor are connected with the first reference signal source and a drain of the first switch transistor respectively; a gate of the first switch transistor is connected with a first timing control signal source, and a source of the first switch transistor is connected with the data line; a gate of the second switch transistor is connected with a second timing control signal source, a source of the second switch transistor is connected with the drain of the first switch transistor, and a drain of the second switch transistor is connected with the first terminal of the first capacitor, wherein the charging sub-circuit comprises: a third switch transistor; a gate of the third switch transistor is connected with the second timing control signal source, a source of the third switch transistor is connected with the data line, and a drain of the third switch transistor is connected with the second terminal of the first capacitor.