Pixel driving circuit, driving method thereof and display panel

1. A pixel driving circuit, comprising a driving transistor, a storage sub-circuit, a data writing sub-circuit, an initialization sub-circuit, a first light-emission control sub-circuit, a second light-emission control sub-circuit and a light-emitting element, wherein:

the data writing sub-circuit is connected to a first electrode of the driving transistor, and is configured to write a data signal to the first electrode of the driving transistor in response to a second scan signal;

the storage sub-circuit is connected to a gate electrode of the driving transistor, a second electrode of the driving transistor and an initial voltage terminal, and is configured to store the data signal written by the data writing sub-circuit;

the initialization sub-circuit is connected to the initial voltage terminal and a first end of the light-emitting element, and is configured to apply a reset voltage of the initial voltage terminal to the light-emitting element in response to a first scan signal;

the first light-emission control sub-circuit is connected to the first electrode of the driving transistor and a first power terminal, and is configured to apply a voltage of the first power terminal to the first electrode of the driving transistor in response to a first light-emission signal;

the driving transistor is configured to generate a drive current in response to the data signal stored in the gate electrode of the driving transistor by the storage sub-circuit, and under action of the voltage applied to the first electrode of the driving transistor by the first light-emission control sub-circuit; and

the second light-emission control sub-circuit is connected to the second electrode of the driving transistor and the first end of the light-emitting element, and is configured to apply the drive current to the light-emitting element in response to a second light-emission signal, wherein a second end of the light-emitting element is connected to a second power terminal,

wherein the initial voltage terminal is configured to provide the reset voltage, the first power terminal is configured to provide a first power voltage, and the second power terminal is configured to provide a second power voltage.

2. The pixel driving circuit according to claim 1 , wherein: the storage sub-circuit includes a storage capacitor and a first transistor, a first end of the storage capacitor is connected to the gate electrode of the driving transistor, and a second end of the storage capacitor is connected to the initial voltage terminal; and

a gate electrode of the first transistor is connected to a first light-emission control line that provides the first light-emission signal, a first electrode of the first transistor is connected to the first end of the storage capacitor, and a second electrode of the first transistor is connected to the second electrode of the driving transistor.

3. The pixel driving circuit according to claim 1 , wherein: the data writing sub-circuit includes a second transistor, a gate electrode of the second transistor is connected to a second scan line that provides the second scan signal, a first electrode of the second transistor is connected to a data line that provides the data signal, and a second electrode of the second transistor is connected to the first electrode of the driving transistor.

4. The pixel driving circuit according to claim 1 , wherein: the initialization sub-circuit includes a third transistor, a gate electrode of the third transistor is connected to a first scan line that provides the first scan signal, a first electrode of the third transistor is connected to the initial voltage terminal to receive the reset voltage, and a second electrode of the third transistor is connected to the first end of the light-emitting element.

5. The pixel driving circuit according to claim 1 , wherein: the first light-emission control sub-circuit includes a fourth transistor, and the second light-emission control circuit includes a fifth transistor;

a gate electrode of the fourth transistor is connected to a first light-emission control line that provides the first light-emission signal, a first electrode of the fourth transistor is connected to the first power terminal, and a second electrode of the fourth transistor is connected to the first electrode of the driving transistor; and

a gate electrode of the fifth transistor is connected to a second light-emission control line that provides the second light-emission signal, a first electrode of the fifth transistor is connected to the second electrode of the driving transistor, and a second electrode of the fifth transistor is connected to the first end of the light-emitting element.

6. The pixel driving circuit according to claim 1 , wherein: the storage sub-circuit includes a storage capacitor and a first transistor, a first end of the storage capacitor is connected to the gate electrode of the driving transistor, and a second end of the storage capacitor is connected to the initial voltage terminal;

a gate electrode of the first transistor is connected to a first light-emission control line that provides the first light-emission signal, a first electrode of the first transistor is connected to the first end of the storage capacitor, and a second electrode of the first transistor is connected to the second electrode of the driving transistor;

the data writing sub-circuit includes a second transistor, a gate electrode of the second transistor is connected to a second scan line that provides the second scan signal, a first electrode of the second transistor is connected to a data line that provides the data signal, and a second electrode of the second transistor is connected to the first electrode of the driving transistor;

the initialization sub-circuit includes a third transistor, a gate electrode of the third transistor is connected to a first scan line that provides the first scan signal, a first electrode of the third transistor is connected to the initial voltage terminal to receive the reset voltage, and a second electrode of the third transistor is connected to the first end of the light-emitting element;

the first light-emission control sub-circuit includes a fourth transistor, and the second light-emission control circuit includes a fifth transistor; a gate electrode of the fourth transistor is connected to a first light-emission control line that provides the first light-emission signal, a first electrode of the fourth transistor is connected to the first power terminal, and a second electrode of the fourth transistor is connected to the first electrode of the driving transistor;

a gate electrode of the fifth transistor is connected to a second light-emission control line that provides the second light-emission signal, a first electrode of the fifth transistor is connected to the second electrode of the driving transistor, and a second electrode of the fifth transistor is connected to the first end of the light-emitting element;

the driving transistor, the second transistor, the third transistor, the fourth transistor and the fifth transistor are P-type transistors, and the first transistor is an N-type transistor.

7. The pixel driving circuit according to claim 2 , wherein: the storage sub-circuit further comprises a sixth transistor, a gate electrode of the sixth transistor is connected to the first light-emission control line, a first electrode of the sixth transistor is connected to the second electrode of the first transistor, and a second electrode of the sixth transistor is connected to the second electrode of the driving transistor.

8. The pixel driving circuit according to claim 6 , wherein: the storage sub-circuit further comprises a sixth transistor, a gate electrode of the sixth transistor is connected to the first light-emission control line, a first electrode of the sixth transistor is connected to the second electrode of the first transistor, and a second electrode of the sixth transistor is connected to the second electrode of the driving transistor.

9. The pixel driving circuit according to claim 8 , wherein the sixth transistor is an N-type transistor.

10. The pixel driving circuit according to claim 2 , wherein: the storage sub-circuit further comprises a sixth transistor, a gate electrode of the sixth transistor is connected to a first scan line that provides the first scan signal, a first electrode of the sixth transistor is connected to the second electrode of the first transistor, and a second electrode of the sixth transistor is connected to the second electrode of the driving transistor.

11. The pixel driving circuit according to claim 6 , wherein: the storage sub-circuit further comprises a sixth transistor, a gate electrode of the sixth transistor is connected to a first scan line that provides the first scan signal, a first electrode of the sixth transistor is connected to the second electrode of the first transistor, and a second electrode of the sixth transistor is connected to the second electrode of the driving transistor.

12. The pixel driving circuit according to claim 11 , wherein the sixth transistor is a P-type transistor.

13. The pixel driving circuit according to claim 2 , wherein the first transistor is an indium gallium zinc oxide (IGZO) transistor.

14. The pixel driving circuit according to claim 6 , wherein the first transistor is an indium gallium zinc oxide (IGZO) transistor.

15. The pixel driving circuit according to claim 6 , wherein the first power terminal is inputted with a first DC (direct current) voltage, the second power terminal is inputted with a second DC voltage, and the second voltage is lower than the first voltage.

16. The pixel driving circuit according to claim 1 , wherein the first power terminal is inputted with a first DC voltage, the second power terminal is inputted with a second DC voltage, and the second voltage is lower than the first voltage.

17. A driving method of a pixel driving circuit, applied to the pixel driving circuit according to claim 1 , comprising: a reset phase, a data writing phase and a light-emitting phase:

in the reset phase, applying, by the initialization sub-circuit in response to the first scan signal, the reset voltage of the initial voltage terminal to the light-emitting element, to reset a voltage of the first end of the light-emitting element; and applying, by the storage sub-circuit in response to the first light-emission signal, the reset voltage to the gate electrode of the driving transistor, to reset a voltage of the gate electrode of the driving transistor;

in the data writing phase, writing, by the data writing sub-circuit in response to the second scan signal, the data signal into the first electrode of the driving transistor, the data signal being Vdata; controlling, by the storage sub-circuit in response to the first light-emission signal, a path between the second electrode and the gate electrode of the driving transistor to be electrically conducted, to enable a voltage of the gate electrode of the driving transistor to be Vdata+Vth and realize writing of the data signal into the storage sub-circuit, wherein Vth is a threshold voltage corresponding to the driving transistor; and

in the light-emitting phase, applying, by the first light-emission control sub-circuit in response to the first light-emission signal, the voltage of the first power terminal to the first electrode of the driving transistor, and applying, by the second light-emission control sub-circuit in response to the second light-emission signal, the drive current to the light-emitting element, to drive the light-emitting element to emit light.

18. A driving method of a pixel driving circuit, applied to the pixel driving circuit according to claim 2 , comprising: a reset phase, a data writing phase and a light-emitting phase:

in the reset phase, applying, by the initialization sub-circuit in response to the first scan signal, the reset voltage of the initial voltage terminal to the light-emitting element, to reset a voltage of the first end of the light-emitting element; and applying, by the storage sub-circuit in response to the first light-emission signal, the reset voltage to the gate electrode of the driving transistor, to reset a voltage of the gate electrode of the driving transistor;

in the data writing phase, writing, by the data writing sub-circuit in response to the second scan signal, the data signal into the first electrode of the driving transistor, the data signal being Vdata; controlling, by the storage sub-circuit in response to the first light-emission signal, a path between the second electrode and the gate electrode of the driving transistor to be electrically conducted, to enable a voltage of the gate electrode of the driving transistor to be Vdata+Vth and realize writing of the data signal into the storage sub-circuit, wherein Vth is a threshold voltage corresponding to the driving transistor; and

in the light-emitting phase, applying, by the first light-emission control sub-circuit in response to the first light-emission signal, the voltage of the first power terminal to the first electrode of the driving transistor, and applying, by the second light-emission control sub-circuit in response to the second light-emission signal, the drive current to the light-emitting element, to drive the light-emitting element to emit light.

19. A display panel, comprising a plurality of pixel units arranged in an array, wherein each of the plurality of pixel units includes the pixel driving circuit according to claim 1 .

20. The pixel driving circuit according to claim 2 , wherein the second end of the storage capacitor is directly connected to the initial voltage terminal.