Display panel, dimming method thereof, and display device

1 . A display panel, wherein when the display panel displays a frame of image, a light emission control signal corresponding to a row of sub-pixels in the display panel comprises N pulse periods, wherein N is a positive integer, one pulse period of the N pulse periods comprises first level pulses, the first level pulses comprise a first target level pulse and a first non-target level pulse, and a pulse width of the first target level pulse is different from a pulse width of the first non-target level pulse;

wherein the N pulse periods comprise a first part of pulse periods and a second part of pulse periods, the first part of pulse periods comprises at least two consecutive pulse periods of the N pulse periods, and the second part of pulse periods comprises at least two consecutive pulse periods of the N pulse periods;

pulse widths of first target level pulses in the first part of pulse periods decrease sequentially and pulse widths of first target level pulses in the second part of pulse periods increase sequentially, or pulse widths of first target level pulses in the first part of pulse periods increase sequentially and pulse widths of first target level pulses in the second part of pulse periods decrease sequentially; and

pulse widths of first non-target level pulses in the first part of pulse periods are the same, and pulse widths of first non-target level pulses in the second part of pulse periods are the same.

2 . The display panel according to claim 1 , wherein a difference value between pulse widths of two adjacent first target level pulses of the first target level pulses in the first part of pulse periods is a first difference value, and a difference value between pulse widths of two adjacent first target level pulses of the first target level pulses in the second part of pulse periods is a second difference value.

3 . The display panel according to claim 1 , wherein the one pulse period comprises two first level pulses;

a first of the two first level pulses in the one pulse period is the first target level pulse, and a second of the two first level pulses in the one pulse period is the first non-target level pulse; or

a second of the two first level pulses in the one pulse period is the first target level pulse, and a first of the two first level pulses in the one pulse period is the first non-target level pulse.

4 . The display panel according to claim 1 , wherein when a brightness level of the display panel is a first brightness level, the pulse width of the first target level pulse is a first pulse width, and the pulse width of the first non-target level pulse is a second pulse width; and

when the brightness level of the display panel is a second brightness level, the pulse width of the first target level pulse is a third pulse width, and the pulse width of the first non-target level pulse is a fourth pulse width,

wherein the first brightness level is different from the second brightness level; and

the first pulse width is different from the third pulse width, and/or the second pulse width is different from the fourth pulse width.

5 . The display panel according to claim 4 , wherein brightness corresponding to the first brightness level is greater than brightness corresponding to the second brightness level, the first pulse width is smaller than the third pulse width, and/or the second pulse width is smaller than the fourth pulse width.

6 . The display panel according to claim 1 , wherein when a brightness level of the display panel is a first brightness level, a number of first target level pulses in the one pulse period is a first number, and a number of first non-target level pulses in the one pulse period is a second number; and

when the brightness level of the display panel is a second brightness level, a number of first target level pulses in the one pulse period is a third number, and a number of first non-target level pulses in the one pulse period is a fourth number,

wherein the first brightness level is different from the second brightness level; and

the first number is different from the third number, and/or the second number is different from the fourth number.

7 . A display device, comprising the display panel according to claim 1 .

8 . The display panel according to claim 1 , wherein the pulse width of the first target level pulse is determined according to a target duty cycle of the light emission control signal expected to be reached.

9 . The display panel according to claim 8 , wherein the pulse width of the first target level pulse is determined according to the target duty cycle and a predetermined correspondence between the pulse width of the first target level pulse and a duty cycle of the light emission control signal.

10 . The display panel according to claim 8 , wherein the pulse width of the first target level pulse is calculated according to the following expression:

D= 1−( W 1* n 1+ W 2* n 2)/ V

wherein D denotes the target duty cycle of the light emission control signal, W 1 denotes the pulse width of the first target level pulse, W 2 denotes the pulse width of the first non-target level pulse, n 1 denotes a number of first target level pulses in the N pulse periods, n 2 denotes a number of first non-target level pulses in the N pulse periods, and V denotes a number of rows of sub-pixels in the display panel.

11 . The display panel according to claim 1 , wherein pulse waveforms of adjacent pulse periods of the N pulse periods are symmetrical, and each of the N pulse periods comprises at least two first target level pulses and at least one first non-target level pulse.

12 . The display panel according to claim 11 , wherein pulse widths of a plurality of consecutive first level pulses in one of the N pulse periods increase or decrease sequentially.

13 . The display panel according to claim 11 , wherein pulse widths of first target level pulses in at least two pulse periods of the N pulse periods are the same, and/or pulse widths of first non-target level pulses in at least two pulse periods of the N pulse periods are the same.

14 . The display panel according to claim 13 , wherein the pulse width of the first target level pulse is determined according to a target duty cycle of the light emission control signal expected to be reached.

15 . The display panel according to claim 14 , wherein the pulse width of the first target level pulse is determined according to the target duty cycle and a predetermined correspondence between the pulse width of the first target level pulse and a duty cycle of the light emission control signal.