CN-116682353-B - Display panel driving method, display panel and display device

Abstract

The embodiment of the invention provides a driving method of a display panel, the display panel and a display device, relates to the field of display, and is used for optimizing regulation and control of a light-emitting control signal and avoiding the situation of flicker deterioration. The driving method comprises the steps of controlling a light-emitting control signal to have a light-emitting total duration of two adjacent unit time in the driving period to meet the following conditions in the first mode: Wherein the unit time comprises at least one light-emitting period, the 1 st unit time at least partially overlaps with the effective frame, N i and N i+1 are respectively the total light-emitting duration of the light-emitting control signal in the ith unit time and the (i+1) th unit time, i is more than or equal to 1, and A is a critical percentage threshold value of brightness change.

Inventors

• ZHANG MENGMENG
• KUANG JIAN
• SUN CHENGUANG

Assignees

• 武汉天马微电子有限公司
• 武汉天马微电子有限公司上海分公司

Dates

Publication Date

20260505

Application Date

20230628

Claims (18)

1. 1. A driving method of display panel is characterized in that, The display panel has a first mode, and a driving period in the first mode includes a valid frame and a sustain frame; the driving method comprises the following steps of controlling the total light-emitting duration of the light-emitting control signals in two adjacent unit time in the driving period to meet the following conditions in the first mode: Wherein the unit time comprises at least one light-emitting period, the 1 st unit time at least partially overlaps with the effective frame, N i and N i+1 are respectively the total light-emitting duration of the light-emitting control signal in the ith unit time and the (i+1) th unit time, i is more than or equal to 1, and A is a critical percentage threshold value of brightness change; the driving method further comprises the steps of judging whether the current brightness level is larger than a first threshold brightness level and smaller than a second threshold brightness level in the first mode, and if so, controlling the total lighting duration of the lighting control signals in two adjacent unit time in the driving period to meet the following conditions: ; Wherein the highest brightness at the first threshold brightness level is The highest brightness at the second threshold brightness level is , Gamma is the gamma value for the highest luminance at the highest luminance level of the display panel.
2. 2. The driving method according to claim 1, wherein, The unit time includes at least two of the light emitting periods.
3. 3. The driving method according to claim 2, wherein, There is an overlap of at least one of the light emitting periods between adjacent two of the unit times.
4. 4. A driving method according to claim 3, wherein, The number of the light emitting periods overlapping between any adjacent two of the unit times is equal.
5. 5. The driving method according to claim 2, wherein, Two adjacent unit times are continuous and do not overlap.
6. 6. The driving method according to claim 1, wherein, The unit time is an integer multiple of one frame time.
7. 7. The driving method according to claim 1, wherein, The display panel has a first brightness level and a second brightness level, and the highest brightness at the second brightness level is less than the highest brightness at the first brightness level; Wherein, A corresponding to the second brightness level is larger than A corresponding to the first brightness level.
8. 8. The driving method according to claim 1, wherein, The first mode comprises a first driving mode and a second driving mode, and the driving frequency in the second driving mode is smaller than that in the first driving mode; The display panel has a third brightness level, wherein a corresponding to the third brightness level in the second driving mode is smaller than a corresponding to the third brightness level in the first driving mode.
9. 9. The driving method according to claim 1, wherein, The first mode comprises a first driving mode and a second driving mode, and the driving frequency in the second driving mode is smaller than that in the first driving mode; The number of the light emitting periods included in the unit time in the second driving mode is greater than the number of the light emitting periods included in the unit time in the first driving mode.
10. 10. The driving method according to claim 1, wherein, The number of the light emitting periods included in the unit time is k; The light-emitting duration of the light-emitting control signal in a single light-emitting period of the effective frame is t1, and when the duty ratio of the light-emitting control signal is changed, the minimum change amount of the light-emitting duration of the light-emitting control signal in the single light-emitting period is deltat; ,k≥1。
11. 11. the driving method according to claim 1, wherein, The number of the light emitting periods included in the unit time is k; The light-emitting duration of the light-emitting control signal in a single light-emitting period of the effective frame is t1, and when the duty ratio of the light-emitting control signal is changed, the minimum change amount of the light-emitting duration of the light-emitting control signal in the single light-emitting period is deltat; ,k> 。
12. 12. the driving method according to claim 11, wherein, 。
13. 13. The driving method according to claim 2, wherein, The display panel has a first brightness level and a second brightness level, and the highest brightness at the second brightness level is less than the highest brightness at the first brightness level; The unit time at the second brightness level includes a first unit time, and the light emission control signal has different light emission durations in at least part of the light emission period of the first unit time.
14. 14. The driving method according to claim 13, wherein, In the first unit time, the light emission control signal has a first light emission duration in an odd number of the light emission periods and a second light emission duration in an even number of the light emission periods, the first light emission duration being different from the second light emission duration.
15. 15. The driving method according to claim 1, wherein, A≤3%。
16. 16. The driving method according to claim 1, wherein, The unit time is greater than or equal to s。
17. 17. A display panel driven by the driving method according to any one of claims 1 to 16.
18. 18. A display device comprising the display panel of claim 17.

Description

Display panel driving method, display panel and display device [ Field of technology ] The present invention relates to the field of display technologies, and in particular, to a driving method of a display panel, and a display device. [ Background Art ] In the case of a display panel driven at a low frequency, in order to improve the flicker phenomenon caused by the leakage current of a transistor, it is common to adjust the duty ratio of a light emission control signal in a hold frame to increase the panel brightness. However, in the current adjustment method, brightness fluctuation caused when the duty ratio of the light emission control signal is changed may rather aggravate flicker, and may adversely affect the flicker. [ Invention ] In view of the above, embodiments of the present invention provide a driving method of a display panel, a display panel and a display device, which are used for optimizing the regulation and control of a light emission control signal, so as to avoid the occurrence of flicker degradation. In one aspect, an embodiment of the present invention provides a driving method of a display panel, the display panel having the first mode, a driving period in the first mode including a valid frame and a sustain frame; the driving method comprises the following steps of controlling the total light-emitting duration of the light-emitting control signals in two adjacent unit time in the driving period to meet the following conditions in the first mode: Wherein the unit time comprises at least one light emitting period, the 1 st unit time at least partially overlaps with the effective frame, N i and N i+1 are respectively light emitting total duration of the light emitting control signal in the ith unit time and the (i+1) th unit time, i is more than or equal to 1, and A is a critical percentage threshold value of brightness change. On the other hand, the embodiment of the invention provides a display panel which is driven by the driving method. In still another aspect, an embodiment of the present invention provides a display device including the above display panel. One of the above technical solutions has the following beneficial effects: In the embodiment of the present invention, when the unit time is set, the 1 st unit time at least partially overlaps with the effective frame, that is, means that the total light emitting duration N 1 of the light emitting control signal in the 1 st unit time covers the light emitting duration of the light emitting control signal in the single light emitting period of the effective frame, then, when the total light emitting duration of the light emitting control signal in any two adjacent unit times is controlled to satisfy It can be considered that the adjustment of the total light emission duration of the light emission control signal in the subsequent unit time is based on the light emission duration of the light emission control signal in the single light emission period of the effective frame. Because the light-emitting control signals under different brightness levels have different light-emitting time lengths in a single light-emitting period of the effective frame, the technical scheme provided by the embodiment of the invention can be used for adjusting the light-emitting control signals in a targeted manner based on the current brightness level of the display panel. The brightness fluctuation amplitude of the light-emitting control signal in any two adjacent unit time is further controlled to be smaller than the threshold value A of the critical brightness change percentage, wherein the human eyes can recognize the flicker, the brightness of the adjacent unit time can be gradually increased slowly and slightly, and the brightness fluctuation amplitude generated when the light-emitting control signal is changed is prevented from being recognized by the human eyes. Therefore, by adopting the driving method according to the embodiment of the invention, the situation of flicker deterioration which occurs when flicker is improved can be avoided under different brightness levels. [ Description of the drawings ] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art. FIG. 1 is a timing diagram of a prior art light emission control signal; FIG. 2 is a timing diagram of the prior art for the light emission control signals at different brightness levels; FIG. 3 is a schematic diagram of brightness fluctuation at different brightness levels in the prior art; FIG. 4 is a timing chart of the light emission control signal according to the embodiment of the invention; FIG. 5 is a timing cha