Method for driving display panel and display apparatus

1. A method for driving a display panel, wherein the display panel has a display region comprising a fingerprint recognition region and comprises subpixels located in the display region and an emission driving circuit, and the subpixels comprise first subpixels located in the fingerprint recognition region and are used as a light source for fingerprint recognition;

wherein the display panel has working modes comprising a first mode and a second mode, wherein the subpixels are scanned at a first frequency in the first mode, and the subpixels are scanned at a second frequency in the second mode, wherein the second frequency is greater than the first frequency; and

wherein the method comprises:

when the display panel is in the first mode, monitoring whether the display panel receives a fingerprint recognition requirement, and if it is monitored that the display panel receives the fingerprint recognition requirement, controlling the display panel to enter a trigger state; and

when the display panel is in the trigger state, scanning the first subpixels at a frequency greater than the first frequency;

wherein the display panel further comprises:

M pixel rows, wherein each of the M pixel rows comprises at least two of the subpixels arranged along a row direction, and the first subpixels are located in an x th pixel row of the M pixel rows to a y th pixel row of the M pixel rows, wherein 1≤x<y≤M, and M is a positive integer greater than 1; and

wherein the emission driving circuit is electrically connected to a first emission frame start signal line, a second emission frame start signal line, and the M pixel rows,

wherein, when the display panel is in the first mode, the method further comprises: successively outputting, by the emission driving circuit in response to a first emission frame start signal, an emission signal to the 1 st pixel row to the M th pixel row, and

wherein, when the display panel enters the trigger state, the method further comprises: successively outputting, by the emission driving circuit in response to a second emission frame start signal, the emission signal to at least the x th pixel row to the y th pixel row; and

wherein, when the display panel is in the first mode, a frequency at which the emission driving circuit outputs the emission signal is greater than the first frequency, and

wherein, when the display panel enters the trigger state, the frequency at which the emission driving circuit outputs the emission signal is equal to the frequency at which the first subpixels are scanned.

2. The method according to claim 1 , wherein the display panel further comprises:

a scanning driving circuit electrically connected to a first scanning frame start signal line, a second scanning frame start signal line, and the M pixel rows; and

wherein when the display panel is in the first mode, the scanning driving circuit successively outputs, in response to a first scanning frame start signal provided by the first scanning frame start signal line, a scanning signal to a 1 st pixel row of the M pixel rows to an M th pixel row of the M pixel rows, and when the display panel is in the trigger state, the scanning driving circuit successively outputs, in response to a second scanning frame start signal provided by the second scanning frame start signal line, the scanning signal to at least the x th pixel row to the y th pixel row.

3. The method according to claim 2 , wherein the scanning driving circuit comprises N 1 first scanning shift units that are cascaded, wherein the N 1 first scanning shift units are electrically connected to the M pixel rows, and an i th first scanning shift unit of the N 1 first scanning shift units is electrically connected to the x th pixel row, wherein N 1 is a positive integer greater than 1, and 1≤i<N 1 ;

the first scanning frame start signal line is electrically connected to a 1 st first scanning shift unit of the N 1 first scanning shift units, and the second scanning frame start signal line is electrically connected to the i th first scanning shift unit;

said the scanning driving circuit successively outputting the scanning signal to the 1 st pixel row to the M th pixel row comprises: providing, by the first scanning frame start signal line, an effective level, and providing, by the second scanning frame start signal line, a non-effective level in such a manner that the N 1 first scanning shift units are controlled to successively output the scanning signal to the 1 st pixel row to the M th pixel row; and

said the scanning driving circuit successively outputting the scanning signal to at least the x th pixel row to the y th pixel row comprises: providing, by the second scanning frame start signal line, an effective level in such a manner that the i th first scanning shift unit to an (N 1 ) th first scanning shift unit of the N 1 first scanning shift units are controlled to successively output the scanning signal to the x th pixel row to the M th pixel row.

4. The method according to claim 2 , wherein the second scanning frame start signal line is connected to a first suppression module in series; and

in a process in which the scanning driving circuit successively outputs, in response to the first scanning frame start signal, the scanning signal to the 1 st pixel row to the M th pixel row, the first suppression module is configured to suppress signal transmission on the second scanning frame start signal line.

5. The method according to claim 2 , wherein if it is monitored that the display panel receives the fingerprint recognition requirement, the method further comprises:

determining whether the scanning driving circuit is in a scanning process where the scanning driving circuit is outputting the scanning signal to the 1 st pixel row to the M th pixel row; and

if it is determined that the scanning driving circuit is in the scanning process, waiting for the scanning driving circuit to output the scanning signal to the M th pixel row and then controlling the display panel to enter the trigger state; or if it is determined that the scanning driving circuit is not in the scanning process, directly controlling the display panel to enter the trigger state.

6. The method according to claim 2 , wherein if it is monitored that the display panel receives the fingerprint recognition requirement, the method further comprises:

determining whether the scanning driving circuit is performing scanning and is in a scanning process where the scanning driving circuit outputs the scanning signal to an (x+1) th pixel row of the M pixel rows to the M th pixel row; and

if it is determined that the scanning driving circuit is performing scanning and is in the scanning process, directly controlling the display panel to enter the trigger state; or if it is determined that the scanning driving circuit is not performing scanning or is not in the scanning process, waiting for the scanning driving circuit to output the scanning signal to the M th pixel row and then controlling the display panel to enter the trigger state.

7. The method according to claim 2 , further comprising:

pre-storing a number n of times of high frequency scanning, wherein n is a positive integer greater than or equal to 1, wherein one time of scanning process during which the scanning driving circuit successively outputs, in response to the second scanning frame start signal, the scanning signal to the x th pixel row to the y th pixel row is one time of high frequency scanning; and

when the display panel is in the trigger state, performing n times of high frequency scanning on the first subpixels.

8. The method according to claim 7 , wherein, when n>1, in processes of the n times of high frequency scanning, the first subpixels are scanned at a same frequency.

9. The method according to claim 7 , wherein, when n>1, in processes of at least two times of high frequency scanning, the first subpixels are scanned at different frequencies.

10. The method according to claim 7 , wherein, when n>1 and the display panel is in the trigger state, the method further comprises:

successively outputting, by the scanning driving circuit in response to the first scanning frame start signal, the scanning signal to the 1 st pixel row to the M th pixel row; and

after a k th time of high frequency scanning of the n times of high frequency scanning ends, determining whether the scanning driving circuit is in a scanning process where the scanning driving circuit outputs the scanning signal to the 1 st pixel row to the M th pixel row, and, if it is determined that the scanning driving circuit is in the scanning process, waiting for the scanning driving circuit to output the scanning signal to the M th pixel row and then performing a (k+1) th time of high frequency scanning of the n times of high frequency scanning, or if it is determined that the scanning driving circuit is not in the scanning process, directly performing the (k+1) th time of high frequency scanning, wherein k=1, . . . , and (n−1).

11. The method according to claim 7 , wherein when n>1 and the display panel is in the trigger state, the method further comprises:

successively outputting, by the scanning driving circuit in response to the first scanning frame start signal, the scanning signal to the 1 st pixel row to the M th pixel row; and

after a k th time of high frequency scanning of the n times of high frequency scanning ends, determining whether the scanning driving circuit is performing scanning and is in a scanning process where the scanning driving circuit outputs the scanning signal to an (x+1) th pixel row of the M pixel rows to the M th pixel row, and if it is determined that the scanning driving circuit is performing scanning and is in the scanning process, directly performing a (k+1) th time of high frequency scanning of the n times of high frequency scanning, or if it is determined that the scanning driving circuit is not performing scanning and is not in the scanning process, waiting for the scanning driving circuit to output the scanning signal to the M th pixel row and then performing the (k+1) th time of high frequency scanning, wherein k=1, . . . , and (n−1).

12. The method according to claim 1 , wherein the first frequency is f 1 , f 1 ≤60 Hz, the second frequency is f 2 , 60 Hz<f 2 ≤f max , and f max is a maximum scanning frequency of the display panel; and

when the display panel is in the trigger state, the frequency at which the first subpixels are scanned is f 3 , where f 3 =f max .

13. The method according to claim 1 , further comprising:

after the display panel enters the trigger state, controlling the display panel to enter a fingerprint recognition state, wherein a start moment of the fingerprint recognition state is later than a start moment of the trigger state.

14. The method according to claim 13 , wherein after the trigger state ends, the display panel is controlled to enter the fingerprint recognition state.

15. The method according to claim 13 , wherein, when the display panel is in the fingerprint recognition state, a frequency at which the subpixels are scanned is equal to the first frequency or the second frequency, or the frequency at which the subpixels are scanned is greater than the first frequency and smaller than the second frequency.

16. The method according to claim 13 , wherein a data voltage received by at least one of the first subpixels in the trigger state is smaller than a data voltage received by the at least one of the first subpixels in the fingerprint recognition state.

17. The method according to claim 16 , wherein in a process of the trigger state, a data voltage received by each of the first subpixels remains constant.

18. The method according to claim 16 , wherein one time of scanning process during which the scanning driving circuit successively outputs, in response to a second scanning frame start signal, the scanning signal to at least the x th pixel row to the y th pixel row is one time of high frequency scanning; and

when the display panel is in the trigger state, n times of high frequency scanning is performed on the first subpixels, wherein n is a positive integer greater than or equal to 1, and a data voltage received by the first subpixels during a k th time of high frequency scanning of the n times of high frequency scanning is greater than a data voltage received by the at least one of the first subpixels during a (k+1) th time of high frequency scanning of the n times of high frequency scanning, wherein k=1, 2, . . . , and (n−1).

19. A display apparatus, comprising:

a display panel, wherein the display panel has a display region comprising a fingerprint recognition region and comprises subpixels located in the display region and an emission driving circuit, and the subpixels comprise first subpixels located in the fingerprint recognition region and are used as a light source for fingerprint recognition; and

a driving chip,

wherein the driving chip is configured to:

control the display panel to be in a first mode such that the display panel scans the subpixels at a first frequency, or control the display panel to be in a second mode such that the display panel scans the subpixels at a second frequency, wherein the second frequency is greater than the first frequency;

monitor, when the display panel is in the first mode, whether the display panel receives a fingerprint recognition requirement, and if it is determined that the display panel receives the fingerprint recognition requirement, transmit a trigger instruction; and

after receiving the trigger instruction, control the display panel to be in a trigger state in such a manner that the display panel scans the first subpixels at a frequency greater than the first frequency;

wherein the display panel further comprises:

M pixel rows, wherein each of the M pixel rows comprises at least two of the subpixels arranged along a row direction, and the first subpixels are located in an x th pixel row of the M pixel rows to a y th pixel row of the M pixel rows, wherein 1≤x<y≤M, and M is a positive integer greater than 1; and

wherein the emission driving circuit is electrically connected to a first emission frame start signal line, a second emission frame start signal line, and the M pixel rows,

wherein, when the display panel is in the first mode, the method further comprises: successively outputting, by the emission driving circuit in response to a first emission frame start signal, an emission signal to the 1 st pixel row to the M th pixel row, and

wherein, when the display panel enters the trigger state, the method further comprises: successively outputting, by the emission driving circuit in response to a second emission frame start signal, the emission signal to at least the x th pixel row to the y th pixel row; and

wherein, when the display panel is in the first mode, a frequency at which the emission driving circuit outputs the emission signal is greater than the first frequency, and

wherein, when the display panel enters the trigger state, the frequency at which the emission driving circuit outputs the emission signal is equal to the frequency at which the first subpixels are scanned.