Pixel circuit, driving method therefor, and display device including the pixel circuit

1. A pixel circuit, comprising: a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a storage capacitor, and a light emitting device;

a gate of the first transistor is connected to a first signal input terminal, a first electrode of the first transistor is connected to a first voltage terminal or a second voltage terminal, and a second electrode of the first transistor is connected to a first electrode of the second transistor;

a gate of the second transistor is directly connected to a second signal input terminal and directly receive a second signal, and a second electrode of the second transistor is connected to a first electrode of the eighth transistor;

a gate of the third transistor is connected to one terminal of the storage capacitor, a first electrode of the third transistor is connected to the first electrode of the eighth transistor, and a second electrode of the third transistor is connected to a first electrode of the fourth transistor;

a gate of the fourth transistor is directly connected to the second signal input terminal and directly receive the second signal, and a second electrode of the fourth transistor is connected to a data voltage terminal;

a gate of the fifth transistor is directly connected to the second signal input terminal and directly receive the second signal, a first electrode of the fifth transistor is connected to the second voltage terminal, and a second electrode of the fifth transistor is connected to the other terminal of the storage capacitor;

a gate of the sixth transistor is connected to an enable signal terminal, a first electrode of the sixth transistor is connected to the other terminal of the storage capacitor, and a second electrode of the sixth transistor is connected to a first electrode of the seventh transistor,

a gate of the seventh transistor is connected to the enable signal terminal, the first electrode of the seventh transistor is connected to a third voltage terminal, and a second electrode of the seventh transistor is connected to the second electrode of the third transistor;

a gate of the eighth transistor is connected to the enable signal terminal, and a second electrode of the eighth transistor is connected to an anode of the light emitting device; and

a cathode of the light emitting device is connected to a fourth voltage terminal.

2. The pixel circuit according to claim 1 , wherein each of the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor is a P-type transistor;

the first electrode of each of said transistors is a drain, and the second electrode of each of said transistors is a source.

3. The pixel circuit according to claim 1 , wherein said transistors include transistors of depletion type or transistors of enhancement type.

4. The pixel circuit according to claim 1 , wherein the light emitting device is an organic light emitting diode.

5. A display device, comprising the pixel circuit according to claim 1 .

6. A driving method for driving the pixel circuit according to claim 1 , comprising:

turning on the first transistor and the third transistor, turning off the second transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor; resetting a gate voltage of the third transistor through a voltage signal of the first voltage terminal or the second voltage terminal;

turning on the second transistor, the third transistor, the fourth transistor, and the fifth transistor, and turning off the first transistor, the sixth transistor, the seventh transistor, and the eighth transistor; writing a data voltage inputted from the data voltage terminal to the second electrode of the third transistor, so as to charge the gate of the third transistor, and writing a voltage inputted from the second voltage terminal to the other terminal of the storage capacitor; and

turning on the third transistor, the sixth transistor, the seventh transistor, and the eighth transistor, turning off the first transistor, the second transistor, the fourth transistor, and the fifth transistor; and

driving the light emitting device to emit light through currents of the third transistor and the eighth transistor.

7. The driving method according to claim 6 , wherein each of the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor is a P-type transistor;

the first electrode of each of said transistors is a drain, and the second electrode of each of said transistors is a source.

8. The driving method according to claim 7 , wherein in a case where the first electrode of the first transistor is connected to the first voltage terminal, when a low level is inputted from the first voltage terminal and the fourth voltage terminal and a high level is inputted from the second voltage terminal and the third voltage terminal, timing of a control signal comprises:

in a reset phase, a high level is inputted to the enable signal terminal, a low level is inputted to the first signal input terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal;

in a writing phase, a high level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a low level is inputted to the second signal input terminal, and a high level is inputted to the data voltage terminal; and

in a light emitting phase, a low level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal; and

wherein in a case where the first electrode of the first transistor is connected to the second voltage terminal, when a low level is inputted from the fourth voltage terminal and a high level is inputted from the third voltage terminal, timing of the control signal comprises:

in a reset phase, a high level is inputted to the enable signal terminal, a low level is inputted to the first signal input terminal, a low level is inputted to the second voltage terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal;

in a writing phase, a high level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a high level is inputted to the second voltage terminal, a low level is inputted to the second signal input terminal, and a high level is inputted to the data voltage terminal; and

in a light emitting phase, a low level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a high level is inputted to the second voltage terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal.

9. A display device, comprising the pixel circuit according to claim 2 .

10. A display device, comprising the pixel circuit according to claim 3 .

11. A display device, comprising the pixel circuit according to claim 4 .

12. A driving method for driving the pixel circuit according to claim 2 , comprising:

turning on the first transistor and the third transistor, turning off the second transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor; resetting a gate voltage of the third transistor through a voltage signal of the first voltage terminal or the second voltage terminal;

turning on the second transistor, the third transistor, the fourth transistor, and the fifth transistor, and turning off the first transistor, the sixth transistor, the seventh transistor, and the eighth transistor; writing a data voltage inputted from the data voltage terminal to the second electrode of the third transistor, so as to charge the gate of the third transistor, and writing a voltage inputted from the second voltage terminal to the other terminal of the storage capacitor; and

turning on the third transistor, the sixth transistor, the seventh transistor, and the eighth transistor, turning off the first transistor, the second transistor, the fourth transistor, and the fifth transistor; and

driving the light emitting device to emit light through currents of the third transistor and the eighth transistor.

13. The driving method according to claim 12 , wherein each of the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor is a P-type transistor;

the first electrode of each of said transistors is a drain, and the second electrode of each of said transistors is a source.

14. The driving method according to claim 13 , wherein in a case where the first electrode of the first transistor is connected to the first voltage terminal, when a low level is inputted from the first voltage terminal and the fourth voltage terminal and a high level is inputted from the second voltage terminal and the third voltage terminal, timing of a control signal comprises:

in a reset phase, a high level is inputted to the enable signal terminal, a low level is inputted to the first signal input terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal;

in a writing phase, a high level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a low level is inputted to the second signal input terminal, and a high level is inputted to the data voltage terminal; and

in a light emitting phase, a low level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal, and

wherein in a case where the first electrode of the first transistor is connected to the second signal input terminal, when a low level is inputted from the fourth voltage terminal and a high level is inputted from the third voltage terminal, timing of the control signal comprises:

in a reset phase, a high level is inputted to the enable signal terminal, a low level is inputted to the first signal input terminal, a low level is inputted to the second voltage terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal;

in a writing phase, a high level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a high level is inputted to the second voltage terminal, a low level is inputted to the second signal input terminal, and a high level is inputted to the data voltage terminal; and

in a light emitting phase, a low level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a high level is inputted to the second voltage terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal.

15. A driving method for driving the pixel circuit according to claim 3 , comprising:

turning on the first transistor and the third transistor, turning off the second transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor; resetting a gate voltage of the third transistor through a voltage signal of the first voltage terminal or the second voltage terminal;

turning on the second transistor, the third transistor, the fourth transistor, and the fifth transistor, and turning off the first transistor, the sixth transistor, the seventh transistor, and the eighth transistor; writing a data voltage inputted from the data voltage terminal to the second electrode of the third transistor, so as to charge the gate of the third transistor, and writing a voltage inputted from the second voltage terminal to the other terminal of the storage capacitor; and

turning on the third transistor, the sixth transistor, the seventh transistor, and the eighth transistor, turning off the first transistor, the second transistor, the fourth transistor, and the fifth transistor; and

driving the light emitting device to emit light through currents of the third transistor and the eighth transistor.

16. The driving method according to claim 15 , wherein each of the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor is a P-type transistor;

the first electrode of each of said transistors is a drain, and the second electrode of each of said transistors is a source.

17. The driving method according to claim 16 , wherein in a case where the first electrode of the first transistor is connected to the first voltage terminal, when a low level is inputted from the first voltage terminal and the fourth voltage terminal and a high level is inputted from the second voltage terminal and the third voltage terminal, timing of a control signal comprises:

in a reset phase, a high level is inputted to the enable signal terminal, a low level is inputted to the first signal input terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal;

in a writing phase, a high level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a low level is inputted to the second signal input terminal, and a high level is inputted to the data voltage terminal; and

in a light emitting phase, a low level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal,

wherein in a case where the first electrode of the first transistor is connected to the second signal input terminal, when a low level is inputted from the fourth voltage terminal and a high level is inputted from the third voltage terminal, timing of the control signal comprises:

in a reset phase, a high level is inputted to the enable signal terminal, a low level is inputted to the first signal input terminal, a low level is inputted to the second voltage terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal;

in a writing phase, a high level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a high level is inputted to the second voltage terminal, a low level is inputted to the second signal input terminal, and a high level is inputted to the data voltage terminal; and

in a light emitting phase, a low level is inputted to the enable signal terminal, a high level is inputted to the first signal input terminal, a high level is inputted to the second voltage terminal, a high level is inputted to the second signal input terminal, and a low level is inputted to the data voltage terminal.