Pixel circuit and driving method, array substrate, and display apparatus

1. A pixel circuit, comprising:

a driving transistor; and

a touch circuit configured to cause a voltage change when a touch operation happens and coupled to a data line through a writing compensation circuit,

wherein the writing compensation circuit includes a storage capacitor, is configured to compensate a threshold voltage of the driving transistor, and to allow the voltage change to be read out through the data line,

the writing compensation circuit further includes a pulling-down sub-circuit for pulling down the voltage of a second terminal of the storage capacitor, and the pulling-down sub- circuit includes a pulling-down switch transistor;

a first terminal of the pulling-down switch transistor is connected to a pulling-down voltage source;

a second terminal of the pulling-down switch transistor is connected to the second terminal of the storage capacitor; and

a control gate terminal of the pulling-down switch transistor is connected to a pulling-down control line.

2. The pixel circuit according to claim 1 , wherein the writing compensation circuit further includes:

a pulling-up sub-circuit for pulling up the voltage of a first terminal of the storage capacitor,

and

a connecting sub-circuit for allowing the voltage of the first terminal of the storage capacitor to be applied to a control gate of the driving transistor.

3. The pixel circuit according to claim 2 , wherein:

the pulling-up sub-circuit includes a pulling-up switch transistor;

a first terminal of the pulling-up switch transistor is connected to a pulling-up voltage source;

a second terminal of the pulling-up switch transistor is connected to the first terminal of the storage capacitor; and

a control gate terminal of the pulling-up switch transistor is connected to a pulling-up control line.

4. The pixel circuit according to claim 2 , wherein:

the driving transistor further includes a first terminal being connected to a driving voltage source for driving the light emitting module.

5. The pixel circuit according to claim 1 , wherein:

the touch circuit includes a touch sensing element and a touch switch transistor; and

the touch switch transistor includes a first terminal being connected to the first terminal of the storage capacitor, a second terminal being connected to a first terminal of the touch sensing element, and a control gate terminal being connected to a touch sensing control line.

6. The pixel circuit according to claim 5 , wherein:

the touch sensing element is a variable capacitor; and

a second terminal of the variable capacitor is floating.

7. The pixel circuit according to claim 5 , wherein:

the touch sensing element is a photosensitive diode; and

a first terminal of the photosensitive diode is connected to a terminal with low potential.

8. The pixel circuit according to claim 1 , wherein:

the pixel circuit further includes a first data connecting switch transistor; and

the data connecting switch transistor includes a first terminal being connected to the data line, a second terminal being connected to the control gate terminal of the driving transistor, and a control gate terminal being connected to a first data connecting control line.

9. The pixel circuit according to claim 1 , wherein:

the pixel circuit further includes a light-emitting module comprising a light emitting switch transistor and an organic light-emitting diode as a pixel of the pixel circuit;

the light-emitting switch transistor includes a first terminal being connected to a second terminal of the driving transistor, a second terminal being connected to a first terminal of the organic light-emitting diode, and a control gate terminal being connected to a light emitting control line; and

a second terminal of the organic light-emitting diode is connected to a pulling-down voltage source.

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

implementing an initialization stage;

implementing a touch sensing stage;

implementing a touch sensing readout stage;

implementing a resetting stage;

implementing a writing compensation stage; and

implementing a light emitting stage.

11. The pixel circuit driving method according to claim 10 , wherein implementing the initialization stage includes:

charging the storage capacitor to make voltage of a first terminal of the storage capacitor be equal to a pulling-up voltage, and voltage of a second terminal of the storage capacitor be equal to a pulling-down voltage.

12. The pixel circuit driving method according to claim 10 , wherein implementing the touch sensing stage includes:

changing voltage on a first terminal of the storage capacitor by the touch circuit when the touch operation happens.

13. The pixel circuit driving method according to claim 10 , wherein implementing the touch sensing readout stage includes:

reading voltage on a first terminal of the storage capacitor by the data line.

14. The pixel circuit driving method according to claim 10 , wherein implementing the resetting stage includes:

charging the storage capacitor to make voltage of a first terminal of the storage capacitor be equal to a pulling-up voltage, and voltage of a second terminal of the storage capacitor be equal to a pulling-down voltage.

15. The pixel circuit driving method according to claim 10 , wherein implementing the writing compensation stage includes:

writing a data voltage into the data line;

writing the data voltage into the control gate of the driving transistor to turn on the driving transistor; and

charging the storage capacitor until the voltage of a second terminal of the storage capacitor is equal to a deviation between the data voltage and the threshold voltage of the control gate of the driving transistor.

16. The pixel circuit driving method according to claim 10 , wherein implementing the light emitting stage includes:

emitting lights through the light emitting module driven by the driving transistor without disturbance of the threshold voltage.

17. An array substrate comprising the pixel circuit according to claim 1 .

18. A display apparatus comprising the array substrate according to claim 17 .