Display device, display substrate, method and device for display compensation

1. A method for display compensation, which is applicable to compensate a display substrate including a plurality of pixel circuits each including a driving transistor, a data line, a sensing line and a first power line, the method comprising:

before displaying an image, performing initial compensation on each of the plurality of pixel circuits to obtain an average reference voltage of the plurality of pixel circuits;

controlling the display substrate to display the image and performing external compensation on each of the plurality of pixel circuits during a display duration of one frame of the image;

obtaining a charging voltage on the sensing line of each of the plurality of pixel circuits during the external compensation;

obtaining a first reference voltage of each of the plurality of pixel circuits according to the charging voltage on the sensing line and the average reference voltage; and

performing internal compensation on each of the plurality of pixel circuits according to the first reference voltage,

wherein the internal compensation comprises: supplying the first reference voltage to the data line of a pixel circuit of the plurality of pixel circuits, and turning on the driving transistor of the pixel circuit, to charge a source electrode of the driving transistor with a voltage of the first power line of the pixel circuit, to compensate for threshold voltage of the driving transistor,

wherein the external compensation comprises: providing a detection voltage to data lines of the plurality of pixel circuits, and obtaining charging voltages on sensing lines of the plurality of pixel circuits, and

wherein the initial compensation comprises: sensing all of the plurality of pixel circuits through the sensing lines using the external compensation.

2. The method for display compensation according to claim 1 , wherein the performing initial compensation on each of the plurality of pixel circuits to obtain the average reference voltage of the plurality of pixel circuits comprises:

providing the detection voltage to the data line of each of the plurality of pixel circuits and maintaining the detection voltage for a first time to turn on the driving transistor of each of the plurality of pixel circuits, and providing a second reference voltage to the sensing line of each of the plurality of pixel circuits and then floating the sensing line of each of the plurality of pixel circuits during the first time, to charge a corresponding sensing line with a voltage of the first power line of each of the plurality of pixel circuits; and

obtaining the charging voltage on the sensing line of each of the plurality of pixel circuits, and obtaining the average reference voltage by averaging the charging voltage on the sensing line of each of the plurality of pixel circuits.

3. The method for display compensation according to claim 1 , wherein during the display duration of one frame of the image, the internal compensation and then the external compensation are performed on each of the plurality of pixel circuits.

4. The method for display compensation according to claim 3 , wherein performing external compensation on any one of the plurality of pixel circuits during the display duration of one frame of the image, and obtaining the charging voltage on the sensing line of the pixel circuit during the external compensation comprises:

providing the detection voltage to the data line of the pixel circuit and maintaining the detection voltage for a first time to turn on the driving transistor of the pixel circuit, and applying the first reference voltage in a duration of current frame to the sensing line of the pixel circuit and then floating the sensing line during the first time, to charge the sensing line with a voltage of the first power line of the pixel circuit; and

obtaining the charging voltage on the sensing line of the pixel circuit during the external compensation by obtaining a charging voltage on the sensing line during the first time.

5. The method for display compensation according to claim 4 , wherein the obtaining the first reference voltage of any one of the plurality of pixel circuits according to the charging voltage on the sensing line and the average reference voltage comprises:

increasing the first reference voltage of the pixel circuit by a first value in a case where the charging voltage on the sensing line of the pixel circuit is greater than the average reference voltage, to obtain a first reference voltage of the pixel circuit during a next frame; and

decreasing the first reference voltage of the pixel circuit by the first value in a case where the charging voltage on the sensing line of the pixel circuit is lower than the average reference voltage, to obtain the first reference voltage of the pixel circuit during the next frame.

6. The method for display compensation according to claim 3 , wherein performing external compensation on any one of the plurality of pixel circuits during the display duration of one frame of the image, and obtaining the charging voltage on the sensing line of the pixel circuit during the external compensation comprises:

providing the detection voltage to the data line of the pixel circuit to turn on the driving transistor of the pixel circuit, and applying the first reference voltage in a duration of current frame to the sensing line of the pixel circuit and then floating the sensing line, to charge the sensing line with a voltage of the first power line of the pixel circuit;

obtaining charging voltages on the sensing line corresponding to any two moments in a charging process, and respectively identifying the charging voltages as a first voltage and a second voltage; and

obtaining a charging voltage on the sensing line at a time when a charging time reaches a first time according to the any two moments, the first voltage and the second voltage, to obtain the charging voltage on the sensing line of the pixel circuit during the external compensation.

7. The method for display compensation according to claim 6 , wherein the obtaining the first reference voltage of any one of the plurality of pixel circuits according to the charging voltage on the sensing line and the average reference voltage comprises:

increasing the first reference voltage of the pixel circuit by a first value in a case where the charging voltage on the sensing line of the pixel circuit is greater than the average reference voltage, to obtain a first reference voltage of the pixel circuit during a next frame; and

decreasing the first reference voltage of the pixel circuit by the first value in a case where the charging voltage on the sensing line of the pixel circuit is lower than the average reference voltage, to obtain the first reference voltage of the pixel circuit during the next frame.

8. The method for display compensation according to claim 1 , wherein the performing internal compensation on any one of the plurality of pixel circuits according to the first reference voltage further comprises:

providing the first reference voltage to the data line of the pixel circuit to reset a gate electrode of the driving transistor of the pixel circuit.

9. A device for display compensation, which is applicable to compensate a display substrate including a plurality of pixel circuits each including a driving transistor, a data line, a sensing line and a first power line, the device comprising:

a full screen compensation circuit configured to, before displaying an image, perform initial compensation on each of the plurality of pixel circuits to obtain an average reference voltage of the plurality of pixel circuits;

a control circuit configured to control the display substrate to display the image and perform external compensation on each of the plurality of pixel circuits during a display duration of one frame of the image, obtain a charging voltage on the sensing line of each of the plurality of pixel circuits during the external compensation, obtain a first reference voltage of each of the plurality of pixel circuits according to the charging voltage on the sensing line and the average reference voltage, and perform internal compensation on each of the plurality of pixel circuits according to the first reference voltage,

wherein the internal compensation comprises: supplying the first reference voltage to the data line of a pixel circuit of the plurality of pixel circuits, and turning on the driving transistor of the pixel circuit, to charge a source electrode of the driving transistor with a voltage of the first power line of the pixel circuit, to compensation for threshold voltage of the driving transistor,

wherein the external compensation comprises: providing a detection voltage to data lines of the plurality of pixel circuits, and obtaining charging voltages on sensing lines of the plurality of pixel circuits, and

wherein the initial compensation comprises: sensing all of the plurality of pixel circuits through the sensing lines using the external compensation.

10. The device for display compensation according to claim 9 , wherein when the full screen compensation circuit performs initial compensation on each of the plurality of pixel circuits to obtain the average reference voltage of the plurality of pixel circuits,

the full screen compensation circuit provides the detection voltage to the data line of each of the plurality of pixel circuits and maintains the detection voltage for a first time to turn on the driving transistor of each of the plurality of pixel circuits, and provides a second reference voltage to the sensing line of each of the plurality of pixel circuits during the first time and then floats the sensing line of each of the plurality of pixel circuits, to charge a corresponding sensing line with a voltage of the first power line of each of the plurality of pixel circuits; and

the full screen compensation circuit obtains the charging voltage on the sensing line of each of the plurality of pixel circuits, and obtains the average reference voltage by averaging the charging voltage on the sensing line of each of the plurality of pixel circuits.

11. The device for display compensation according to claim 9 , wherein during the display duration of one frame of the image, the control circuit performs the internal compensation and then the external compensation on each of the plurality of pixel circuits.

12. The device for display compensation according to claim 11 , wherein when the control circuit performs external compensation on any one of the plurality of pixel circuits and obtains the charging voltage on the sensing line of the pixel circuit during the external compensation,

the control circuit provides the detection voltage to the data line of the pixel circuit and maintains the detection voltage for a first time to turn on the driving transistor of the pixel circuit, and applies the first reference voltage in a duration of current frame to the sensing line of the pixel circuit and then floats the sensing line during the first time, to charge the sensing line with a voltage of the first power line of the pixel circuit; and

the control circuit obtains the charging voltage on the sensing line of the pixel circuit during the external compensation by obtaining a charging voltage on the sensing line during the first time.

13. The device for display compensation according to claim 12 , wherein when the control circuit obtains the first reference voltage of any one of the plurality of pixel circuits according to the charging voltage on the sensing line and the average reference voltage,

the control circuit increases the first reference voltage of the pixel circuit by a first value in a case where the charging voltage on the sensing line of the pixel circuit is greater than the average reference voltage, to obtain the first reference voltage of the pixel circuit during a next frame; and

the control circuit decreases the first reference voltage of the pixel circuit by the first value in a case where the charging voltage on the sensing line of the pixel circuit is lower than the average reference voltage, to obtain the first reference voltage of the pixel circuit during the next frame.

14. The device for display compensation according to claim 11 , wherein when the control circuit performs external compensation any one of the plurality of pixel circuits and obtains the charging voltage on the sensing line of the pixel circuit during the external compensation,

the control circuit provides the detection voltage to the data line of the pixel circuit to turn on the driving transistor of the pixel circuit, and applies the first reference voltage in a duration of current frame to the sensing line of the pixel circuit and then floats the sensing line, to charge the sensing line with a voltage of the first power line of the pixel circuit; the control circuit obtains charging voltages on the sensing line corresponding to any two moments in a charging process, and respectively identifying the charging voltages as a first voltage and a second voltage; and

the control circuit obtains a charging voltage on the sensing line at a time when a charging time reaches a first time according to the any two moments, the first voltage and the second voltage, to obtain the charging voltage on the sensing line of the pixel circuit during the external compensation.

15. The device for display compensation according to claim 14 , wherein when the control circuit obtains the first reference voltage of any one of the plurality of pixel circuits according to the charging voltage on the sensing line and the average reference voltage,

the control circuit increases the first reference voltage of the pixel circuit by a first value in a case where the charging voltage on the sensing line of the pixel circuit is greater than the average reference voltage, to obtain the first reference voltage of the pixel circuit during a next frame; and

the control circuit decreases the first reference voltage of the pixel circuit by the first value in a case where the charging voltage on the sensing line of the pixel circuit is lower than the average reference voltage, to obtain the first reference voltage of the pixel circuit during the next frame.

16. The device for display compensation according to claim 11 , wherein when the control circuit performs internal compensation on any one of the plurality of pixel circuits according to the first reference voltage,

the control circuit provides the first reference voltage to the data line of the pixel circuit to reset a gate electrode of the driving transistor of the pixel circuit.

17. A display substrate comprising the device for display compensation according to claim 9 .

18. A display device comprising the display substrate according to claim 17 .