Compensation method and compensation apparatus for pixel circuit and display apparatus

1. A compensation method for a pixel circuit, the compensation method comprising:

calculating a current threshold voltage V th of a driving transistor of the pixel circuit according to a current source voltage V s of the driving transistor and a data voltage applied to a gate of the driving transistor;

comparing the current source voltage V s of the driving transistor with the current threshold voltage V th ; and

adjusting the current source voltage V s of the driving transistor according to a comparison result,

wherein the current source voltage V s is a positive number, and the current threshold voltage V th is a negative number; and the adjusting the current source voltage V s of the driving transistor according to a comparison result comprises:

increasing the current source voltage V s of the driving transistor in response to an opposite number−V s of the current source voltage V s of the driving transistor being greater than the threshold voltage V th ;

wherein the threshold voltage is a threshold voltage of the driving transistor while applying data voltage to the gate of the driving transistor.

2. The compensation method according to claim 1 , wherein increasing the source voltage of the driving transistor comprises:

generating a target source voltage by adding a set value to a value of a current source voltage of the driving transistor; and

inputting the target source voltage to a source of the driving transistor.

3. The compensation method according to claim 2 , wherein the target source voltage is greater than or equal to 0V.

4. The compensation method according to claim 2 , wherein the set value is a fixed value.

5. The compensation method according to claim 4 , wherein the set value is an integral multiple of 0.5 or an integral multiple of 0.2.

6. The compensation method according to claim 2 , wherein

the set value is greater than an absolute value of a sum of the threshold voltage and the current source voltage.

7. The compensation method according to claim 1 , wherein a light emitting unit in the pixel circuit which is connected to the driving transistor is controlled not to emit light during the acquisition of the threshold voltage of the driving transistor.

8. A compensation apparatus for a pixel circuit, comprising:

a sensing circuit configured to calculate a current threshold voltage V th of a driving transistor of the pixel circuit according to a current source voltage V s of the driving transistor and a data voltage applied to a gate of the driving transistor; and

a controller configured to compare the current source voltage V s of the driving transistor with the current threshold voltage V th , and adjust the current source voltage V s of the driving transistor according to a comparison result,

wherein the current source voltage V s is a positive number, and the current threshold voltage V th is a negative number; and wherein the controller is configured to adjust the current source voltage V s of the driving transistor according to the comparison result by:

increasing the current source voltage V s of the driving transistor in response to an opposite value−V s of the current source voltage V s of the driving transistor being greater than the current threshold voltage V th ;

wherein the threshold voltage is a threshold voltage of the driving transistor while applying data voltage to the gate of the driving transistor.

9. The compensation apparatus according to claim 8 , wherein the controller is configured to increase the source voltage of the driving transistor by:

generating a target source voltage by adding a set value to a value of a current source voltage of the driving transistor; and

inputting the target source voltage to a source of the driving transistor.

10. The compensation apparatus according to claim 9 , wherein the target source voltage is greater than or equal to 0V.

11. The compensation apparatus according to claim 9 , wherein the set value is a fixed value.

12. The compensation apparatus according to claim 11 , wherein the set value is an integral multiple of 0.5 or an integral multiple of 0.2.

13. The compensation apparatus according to claim 9 , wherein

the set value is greater than an absolute value of a sum of the threshold voltage and the current source voltage.

14. The compensation apparatus according to claim 8 , wherein the sensing circuit is configured to control a light emitting unit in the pixel circuit which is connected to the driving transistor not to emit light during the acquisition of the threshold voltage of the driving transistor.

15. The compensation apparatus according to claim 8 , wherein the sensing circuit comprises a sensing transistor and a sensing capacitor, wherein the sensing transistor has a gate connected to receive a control signal, a first electrode connected to a source of the driving transistor, and a second electrode connected to a first terminal of the sensing capacitor, and a second terminal of the sensing capacitor is grounded.

16. A display apparatus, comprising the compensation apparatus for the pixel driving circuit according to claim 8 .