Pixel circuit and method of driving the same, display device

1. A pixel circuit, including:

a light emitting device;

a driving sub-circuit configured to drive the light emitting device, the driving sub-circuit including a driving transistor configured to generate a driving current flowing through the light emitting device so that the light emitting device emits light;

a reset sub-circuit configured to reset a voltage between a gate electrode and a second electrode of the driving transistor; and

a compensation sub-circuit configured to compensate a threshold voltage of the driving transistor,

wherein a part of the reset sub-circuit is reused as at least a part of the compensation sub-circuit,

the reset sub-circuit includes a first transistor and a second transistor,

a gate electrode of the first transistor is directly connected to a second scan signal terminal, a first electrode of the first transistor is directly connected to the gate electrode of the driving transistor, and a second electrode of the first transistor is directly connected to the initial voltage terminal,

a gate electrode of the second transistor is directly connected to a light emission control signal terminal, a first electrode of the second transistor is directly connected to the second electrode of the driving transistor, and a second electrode of the second transistor is directly connected to the gate electrode of the driving transistor,

the light emission control sub-circuit includes a fourth transistor and a fifth transistor,

a gate electrode of the fourth transistor is directly connected to the light emission control signal terminal, a first electrode of the fourth transistor is directly connected to a first voltage terminal, and

a second electrode of the fourth transistor is directly connected to a first electrode of the driving transistor, and a gate electrode of the fifth transistor is directly connected to the light emission control signal terminal, a first electrode of the fifth transistor is directly connected to the second electrode of the driving transistor, and a second electrode of the fifth transistor is directly connected to the light emitting device.

2. The pixel circuit according to claim 1 , further including:

a light emission control sub-circuit configured to transmit the driving current to the light emitting device.

3. The pixel circuit according to claim 1 , wherein the reset sub-circuit is configured to write an initial voltage of an initial voltage terminal to the light emitting device.

4. The pixel circuit according to claim 3 ,

wherein the reset sub-circuit further includes a third transistor; a gate electrode of the third transistor is directly connected to a second scan signal terminal, a first electrode of the third transistor is directly connected to the light emitting device, and a second electrode of the third transistor is directly connected to an initial voltage terminal.

5. The pixel circuit according to claim 1 , wherein the compensation sub-circuit includes the second transistor.

6. The pixel circuit according to claim 1 ,

wherein the write sub-circuit includes a sixth transistor, a first electrode of the sixth transistor is directly connected to a first scan signal terminal, a first electrode of the sixth transistor is directly connected to a data voltage terminal, and a second electrode of the sixth transistor is directly connected to a first electrode of the driving transistor.

7. A display device, including pixel circuit of claim 1 .

8. The display device according to claim 7 , wherein the display device includes a display panel on which sub-pixels arranged in a matrix are disposed, the pixel circuits being arranged in the sub-pixels;

except a first row of the sub-pixels, second scan signal terminals of the pixel circuits in a next row of sub-pixels are connected to first scan signal terminals of the pixel circuits in a previous row of sub-pixels.

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

setting a first electrode of the driving transistor to a float state, and writing, by the reset sub-circuit, an initial voltage of an initial voltage terminal to the gate electrode and the second electrode of the driving transistor in the driving sub-circuit;

writing, by a writing sub-circuit, a data voltage of a data voltage terminal to the driving sub-circuit according to a control signal provided by a first scan signal terminal;

generating, by the driving sub-circuit, a driving current according to a first voltage terminal, a second voltage terminal, and a data voltage written to the driving sub-circuit; and

emitting light by the light emitting device according to the driving current,

wherein the reset sub-circuit is directly connected to a second scan signal terminal and a light emission control signal terminal; the reset sub-circuit includes a first transistor and a second transistor, wherein a gate electrode of the first transistor is directly connected to the second scan signal terminal, a first electrode of the first transistor is directly connected to the gate electrode of the driving transistor, and a second electrode of the first transistor is directly connected to the initial voltage terminal; a gate electrode of the second transistor is directly connected to the light emission control signal terminal, a first electrode of the second transistor is directly connected to the second electrode of the driving transistor, a second electrode of the second transistor is directly connected to the gate electrode of the driving transistor, and the driving transistor is a P-type transistor, setting a first electrode of the driving transistor to a float state and writing, by the reset sub-circuit, an initial voltage of an initial voltage terminal to the gate electrode and the second electrode of the driving transistor in the driving sub-circuit includes:

setting the first electrode of the driving transistor to the float state;

providing a signal of the second scan signal terminal to the gate electrode of the first transistor of the reset sub-circuit so that the first transistor is turned on;

providing the initial voltage of the initial voltage terminal to the first electrode of the first transistor so that the initial voltage of the initial voltage terminal is written to the gate electrode of the driving transistor; and

providing a signal of the light emission control signal terminal to the gate electrode of the second transistor of the reset sub-circuit, so that the second transistor is turned on, the gate electrode of the driving transistor is electrically connected to the second electrode of the driving transistor through the first electrode of the second transistor and the second electrode of the second transistor.

10. The method according to claim 9 , further including: compensating, by a compensation sub-circuit, a threshold voltage of the driving transistor in the driving sub-circuit.

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

setting a first electrode of the driving transistor to a float state, and writing, by the reset sub-circuit, an initial voltage of an initial voltage terminal to the gate electrode and the second electrode of the driving transistor in the driving sub-circuit;

writing, by a writing sub-circuit, a data voltage of a data voltage terminal to the driving sub-circuit according to a control signal provided by a first scan signal terminal;

generating, by the driving sub-circuit, a driving current according to a first voltage terminal, a second voltage terminal, and a data voltage written to the driving sub-circuit; and

emitting light by the light emitting device according to the driving current,

wherein the reset sub-circuit is directly connected to the first scan signal terminal, a second scan signal terminal, and an anode of the light emitting device; the reset sub-circuit comprises a first transistor, a second transistor and a third transistor, wherein a gate electrode of the first transistor is directly connected to the second scan signal terminal, a first electrode of the first transistor is directly connected to the gate electrode of the driving transistor, and a second electrode of the first transistor is directly connected to the initial voltage terminal; a gate electrode of the second transistor is directly connected to the second scan signal terminal, a first electrode of the second transistor is directly connected to the anode of the light emitting device, and a second electrode of the second transistor is directly connected to the initial voltage terminal; a gate electrode of the third transistor is directly connected to the first scan signal terminal, a first electrode of the third transistor is directly connected to the second electrode of the driving transistor, a second electrode of the third transistor is directly connected to the anode of the light emitting device, wherein the driving transistor is a P-type transistor, setting a first electrode of the driving transistor to a float state and writing, by the reset sub-circuit, an initial voltage of an initial voltage terminal to the gate electrode and the second electrode of the driving transistor in the driving sub-circuit includes:

setting the first electrode of the driving transistor to the float state;

providing a signal of the second scan signal terminal to the gate electrode of the first transistor of the reset sub-circuit and the gate electrode of the second transistor of the reset sub-circuit so that both of the first transistor and the second transistor are turned on;

providing a signal of the first scan signal terminal to the gate electrode of the third transistor of the reset sub-circuit so that the third transistor is turned on;

writing the initial voltage of the initial voltage terminal to the gate electrode of the driving transistor through the first transistor;

writing the initial voltage of the initial voltage terminal to the light emitting device through the second transistor; and

writing the initial voltage of the initial voltage terminal to the second electrode of the driving transistor through the second transistor and the third transistor.

12. The method according to claim 11 , further including: compensating, by a compensation sub-circuit, a threshold voltage of the driving transistor in the driving sub-circuit.