Display panel driving method and display device

Abstract

This application discloses a driving method and display device for a display panel. The display panel to display a screen includes a first initial screen and a second initial screen in succession. The driving method includes: obtaining a first initial grayscale value of the first initial screen at a first refresh rate; obtaining a first reference grayscale value corresponding to the first refresh rate and the first initial grayscale value according to a preset lookup table; driving the display panel to display a first target screen according to the first reference grayscale value; obtaining a second initial grayscale value of the second initial screen at a second refresh rate; obtaining a second reference grayscale value corresponding to the second refresh rate and the second initial grayscale value according to a preset lookup table; determining whether the difference between the first reference grayscale value and the second reference grayscale value is greater than a preset threshold; if the difference is greater than the preset threshold, obtaining an overdrive grayscale value corresponding to the first reference grayscale value and the second reference grayscale value; and driving the display panel to display a second target screen according to the overdrive grayscale value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a driving method of display panel and display device. BACKGROUND

[0002] When the existing display panel rapidly switches between different refresh frequencies, the human eye will perceive a very obvious flicker phenomenon. In the prior art, the Variable Refresh Rate De-Flicker (VDF) technology under variable refresh rate is used to compensate for the gray scale of the picture displayed by the display panel, so as to improve the flicker problem under the variable refresh rate mode.

[0003] At the same time, when the existing display panel switches the gray scale of different pictures, due to the long response time of liquid crystal, the display panel has the problem of dynamic trailing. In the prior art, the Over Drive (OD) technology is used to speed up the response time of liquid crystal, so as to improve the problem of dynamic trailing.

[0004] However, the existing display panel is prone to mis-triggering the OD function when the VDF function is needed to compensate for the gray scale of the picture under low refresh frequency, resulting in low effect of gray scale compensation. SUMMARY

[0005] Embodiments of the present application provide a driving method of display panel and display device, aiming to improve the conflict between OD function and VDF function, so as to improve the effect of gray scale compensation.

[0006] In one aspect, the embodiment of the present application provides a driving method of display panel, the picture to be displayed by the display panel includes a first initial picture and a second initial picture in sequence, and the driving method comprises: obtaining a first initial gray scale value of the first initial picture under a first refresh frequency; obtaining a first reference gray scale value corresponding to the first refresh frequency and the first initial gray scale value according to a preset reference table; driving the display panel to display a first target picture according to the first reference gray scale value; obtaining a second initial gray scale value of the second initial picture under a second refresh frequency; obtaining a second reference gray scale value corresponding to the second refresh frequency and the second initial gray scale value according to the preset reference table; judging whether the difference between the first reference gray scale value and the second reference gray scale value is greater than a preset threshold value; if the difference is greater than the preset threshold value, obtaining an over drive gray scale value corresponding to the first reference gray scale value and the second reference gray scale value; and driving the display panel to display a second target picture according to the over drive gray scale value.

[0007] Optionally, in some embodiments of the present application, the step of obtaining the first reference gray scale value corresponding to the first refresh frequency and the first initial gray scale value according to the preset correspondence table comprises: obtaining a first gray scale compensation value corresponding to the first refresh frequency and the first initial gray scale value according to the preset correspondence table, the preset correspondence table comprising a corresponding relationship among refresh frequency, gray scale value and gray scale compensation value; calculating the first reference gray scale value according to the first initial gray scale value and the first gray scale compensation value; the step of obtaining the second reference gray scale value corresponding to the second refresh frequency and the second initial gray scale value according to the preset correspondence table comprises: obtaining a second gray scale compensation value corresponding to the second refresh frequency and the second initial gray scale value according to the preset correspondence table; calculating the second reference gray scale value according to the second initial gray scale value and the second gray scale compensation value.

[0008] Optionally, in some embodiments of the present application, the preset threshold value is equal to a difference between a maximum value and a minimum value of the plurality of gray scale compensation values in the preset correspondence table.

[0009] Optionally, in some embodiments of the present application, the driving method further comprises: if the difference value is less than the preset threshold value, driving the display panel to display the second target picture according to the second reference gray scale value.

[0010] Optionally, in some embodiments of the present application, the first initial gray scale value is an average value of gray scale values corresponding to the first initial picture input to a plurality of pixels in a preset region of the display panel, and the second initial gray scale value is an average value of gray scale values corresponding to the second initial picture input to a plurality of pixels in the preset region of the display panel.

[0011] Optionally, in some embodiments of the present application, the driving method further comprises: obtaining a target luminance value of the display panel at a preset gray scale value; obtaining a reference gray scale value corresponding to the preset gray scale value at a preset refresh frequency according to the target luminance value; calculating a difference value between the reference gray scale value and each of a plurality of preset gray scale values to obtain a gray scale compensation value corresponding to any gray scale value at the preset refresh frequency; and establishing the preset correspondence table comprising a corresponding relationship among the preset refresh frequency, the preset gray scale value and the gray scale compensation value.

[0012] Optionally, in some embodiments of the present application, a difference between the first refresh frequency and the second refresh frequency is greater than a preset frequency difference value, and a difference between the first initial gray scale value and the second initial gray scale value is less than a preset gray scale difference value.

[0013] Optionally, in some embodiments of the present application, the preset frequency difference value is greater than or equal to 10 Hz, and the preset gray scale difference value is between 0 gray scale and 5 gray scale.

[0014] In another aspect, the present application provides a display device, comprising: a display panel and a driving circuit, the driving circuit being electrically connected with the display panel, wherein the display panel comprises a plurality of pixels arranged in an array, the plurality of pixels being used for displaying a picture, the picture to be displayed by the display panel comprising a first initial picture and a second initial picture displayed in succession; the driving circuit comprises: an obtaining module, a judging module and a driving module, the obtaining module being configured to obtain a first initial gray scale value of the first initial picture at a first refresh frequency and a second initial gray scale value of the second initial picture at a second refresh frequency, and configured to obtain a first reference gray scale value corresponding to the first refresh frequency and the first initial gray scale value and a second reference gray scale value corresponding to the second refresh frequency and the second initial gray scale value according to a preset reference table; the judging module being configured to judge whether a difference between the first reference gray scale value and the second reference gray scale value is greater than a preset threshold; and the driving module being configured to obtain an overdrive gray scale value corresponding to the first reference gray scale value and the second reference gray scale value if the difference is greater than the preset threshold, and configured to drive the display panel to display a first target picture according to the first reference gray scale value and to display a second target picture according to the overdrive gray scale value.

[0015] Optionally, in some embodiments of the present application, the judging module comprises a comparator, a first input terminal of the comparator being electrically connected with a first voltage input terminal, a second input terminal of the comparator being electrically connected with the obtaining module, and an output terminal of the comparator being electrically connected with the driving module, the output terminal of the comparator being configured to output a control signal to the driving module, the driving module being configured to output an overdrive gray scale value according to the control signal; wherein the first voltage input terminal inputs a first voltage value corresponding to the preset threshold to the first input terminal, and the obtaining module inputs a second voltage value corresponding to the difference to the second input terminal.

[0016] The display panel driving method and display device provided in this application involve: obtaining a first initial grayscale value of the first initial image at a first refresh rate; obtaining a first reference grayscale value corresponding to the first refresh rate and the first initial grayscale value according to a preset lookup table; driving the display panel to display a first target image according to the first reference grayscale value; obtaining a second initial grayscale value of the second initial image at a second refresh rate; obtaining a second reference grayscale value corresponding to the second refresh rate and the second initial grayscale value according to the preset lookup table; determining whether the difference between the first reference grayscale value and the second reference grayscale value is greater than a preset threshold; if the difference is greater than the preset threshold, obtaining an overdrive grayscale value corresponding to the first reference grayscale value and the second reference grayscale value; and driving the display panel to display a second target image according to the overdrive grayscale value. Specifically, the method determines whether to enable the OD function based on whether the difference between the first reference grayscale value and the second reference grayscale value is greater than a preset threshold, thereby improving the conflict between the OD function and the VDF function and enhancing the grayscale compensation effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the display device provided in this application;

[0018] Figure 2 yes Figure 1 A schematic diagram of the driving circuit in the display device provided in the document;

[0019] Figure 3 This is a first flowchart of the driving method for the display panel provided in this application;

[0020] Figure 4 yes Figure 3 A flowchart of the sub-steps of step S20;

[0021] Figure 5 yes Figure 4 A flowchart of the sub-steps of step S201;

[0022] Figure 6 This is a second flowchart of the driving method for the display panel provided in this application. Detailed Implementation

[0023] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. The described technical solutions are for illustrative purposes only and should not be construed as limiting the scope of protection of this application.

[0024] Existing display panels are driven by Variable Refresh Rate (VRR) mode. In VRR mode, the refresh rate is changed by adjusting the length of the Vertical Blank Interval (V-blank) area. Generally, the lower the refresh rate in VRR mode, the longer the V-blank area. A longer V-blank area results in more leakage current, leading to lower pixel electrode voltage and thus lower pixel brightness. Therefore, when rapidly switching between high and low refresh rates, the pixel brightness changes significantly, causing noticeable flickering that is perceptible to the naked eye. Existing technology uses Variable Refresh Rate De-Flicker (VDF) to compensate for the grayscale of the displayed image. This involves compensating for some of the leakage current in the V-blank area by adjusting the voltage, thereby improving the flickering problem in VRR mode.

[0025] Meanwhile, existing display panels suffer from motion blur when switching between different grayscale levels due to the long liquid crystal response time. Current technology employs overdrive (OD) to accelerate the liquid crystal response time and mitigate this motion blur issue.

[0026] However, existing display panels are prone to accidentally triggering the OD function when grayscale compensation of images at low refresh rates is required via VDF, resulting in poor grayscale compensation performance. To address this issue, embodiments of this application provide a display device, as follows:

[0027] like Figure 1 As shown, an embodiment of this application provides a display device 100, including a display panel 110 and a driving circuit 120, wherein the driving circuit 120 is electrically connected to the display panel 110.

[0028] The display panel 110 includes a plurality of pixels 10 arranged in an array. The plurality of pixels 10 are used to display images, and the images to be displayed on the display panel include a first initial image and a second initial image in succession.

[0029] like Figure 2 As shown, the driving circuit 120 includes: an acquisition module 121, a judgment module 122, and a driving module 123. The acquisition module 121 is electrically connected to the judgment module 122, the judgment module 122 is electrically connected to the driving module 123, and the driving module 123 is electrically connected to the display panel.

[0030] In the embodiments of this application, the acquisition module 121 is used to acquire the first initial grayscale value of the first initial image at the first refresh frequency and the second initial grayscale value of the second initial image at the second refresh frequency, and to acquire the first reference grayscale value corresponding to the first refresh frequency and the first initial grayscale value according to a preset lookup table, and to acquire the second reference grayscale value corresponding to the second refresh frequency and the second initial grayscale value.

[0031] In the embodiments of this application, the judgment module 122 is used to determine whether the difference between the first reference grayscale value and the second reference grayscale value is greater than a preset threshold.

[0032] In embodiments of this application, the driving module 123 is used to obtain the overdrive grayscale value corresponding to the first reference grayscale value and the second reference grayscale value if the difference is greater than a preset threshold. It is also used to drive the display panel to display the first target image based on the first reference grayscale value, and to drive the display panel to display the second target image based on the overdrive grayscale value.

[0033] In the embodiments of this application, the judgment module 122 includes a comparator. The first input terminal of the comparator is electrically connected to the first voltage input terminal Vref, the second input terminal of the comparator is electrically connected to the acquisition module 121, and the output terminal of the comparator is electrically connected to the driving module 123. The output terminal of the comparator is used to output a control signal to the driving module 123, and the driving module 123 is used to output an overdrive grayscale value according to the control signal. Specifically, the first voltage input terminal Vref inputs a first voltage value corresponding to a preset threshold to the first input terminal, and the acquisition module 121 inputs a second voltage value corresponding to the difference to the second input terminal.

[0034] Specifically, when the second voltage value is greater than the first voltage value, the output terminal of the comparator outputs a first control signal to the drive module 123. The drive module 123 activates the VDF function and OD function according to the first control signal to obtain the overdrive grayscale value corresponding to the first reference grayscale value and the second reference grayscale value. The display panel 100 is driven to display the first target image according to the first reference grayscale value, and the display panel 100 is driven to display the second target image according to the overdrive grayscale value.

[0035] In embodiments of this application, the driving module is further configured to drive the display panel to display a first target image based on a first reference grayscale value and to drive the display panel to display a second target image based on a second reference grayscale value if the difference is less than a preset threshold.

[0036] In the embodiments of this application, when the second voltage value is less than the first voltage value, the output terminal of the comparator outputs a second control signal to the driving module 123. The driving module 123 enables the VDF function and disables the OD function according to the second control signal, thereby driving the display panel 100 to display the first target image according to the first reference grayscale value, and driving the display panel 100 to display the second target image according to the second reference grayscale value.

[0037] The display device provided in this application acquires a first initial grayscale value of a first initial image at a first refresh rate and a second initial grayscale value of a second initial image at a second refresh rate. It acquires a first reference grayscale value corresponding to the first refresh rate and the first initial grayscale value, and a second reference grayscale value corresponding to the second refresh rate and the second initial grayscale value, according to a preset lookup table. It then determines whether the difference between the first reference grayscale value and the second reference grayscale value is greater than a preset threshold. If the difference is greater than the preset threshold, it acquires the overdrive grayscale value corresponding to the first reference grayscale value and the second reference grayscale value. The display panel is driven to display a first target image based on the first reference grayscale value, and the display panel is driven to display a second target image based on the overdrive grayscale value. In other words, the difference between the first reference grayscale value and the second reference grayscale value is used to determine whether to enable the OD function, thereby improving the conflict between the OD function and the VDF function and enhancing the grayscale compensation effect.

[0038] like Figure 3 As shown, an embodiment of this application provides a driving method for a display panel. The display panel displays a first initial screen and a second initial screen that are displayed sequentially. The driving method includes:

[0039] S10. Obtain the first initial grayscale value of the first initial screen at the first refresh rate.

[0040] In embodiments of this application, the first initial grayscale value is the average of the grayscale values ​​corresponding to the first initial image of multiple pixels within a preset area of ​​the display panel. Specifically, the preset area includes a central area and / or a non-central area. For example, the first initial grayscale value is the average of the grayscale values ​​corresponding to the first initial image of multiple pixels within the central area of ​​the display panel, and / or, the first initial grayscale value is the average of the grayscale values ​​corresponding to the first initial image of multiple pixels within a non-central area of ​​the display panel.

[0041] S20. Obtain the first reference grayscale value corresponding to the first refresh frequency and the first initial grayscale value according to the preset lookup table.

[0042] like Figure 4 As shown, step S20 includes the following sub-steps:

[0043] S201. Obtain the first gray level compensation value corresponding to the first refresh frequency and the first initial gray level value according to the preset lookup table. The preset lookup table includes the correspondence between refresh frequency, gray level value and gray level compensation value.

[0044] In embodiments of this application, the driving method further includes establishing a preset lookup table. For example... Figure 5 As shown, the methods for establishing a preset lookup table include:

[0045] S1. Obtain the target brightness value of the display panel at the preset grayscale value.

[0046] In the embodiments of this application, the target brightness value includes the brightness value corresponding to any preset grayscale value of the display panel at the highest refresh rate. Specifically, the highest refresh rate of the display panel includes 240 Hz. The preset grayscale value is between 0 grayscale and 255 grayscale. Specifically, the preset grayscale value includes 0 grayscale, 10 grayscale, 20 grayscale, 30 grayscale, 40 grayscale, 50 grayscale, 60 grayscale, 70 grayscale, 80 grayscale, 90 grayscale, 100 grayscale, 110 grayscale, 120 grayscale, 130 grayscale, 140 grayscale, 150 grayscale, 160 grayscale, 170 grayscale, 180 grayscale, 190 grayscale, 200 grayscale, 210 grayscale, 220 grayscale, 230 grayscale, 240 grayscale, 250 grayscale, and 255 grayscale, etc. For example, obtaining the brightness value corresponding to 90 gray levels at 240 Hz for the display panel is the target brightness value corresponding to 90 gray levels at any refresh rate.

[0047] S2. Obtain the reference grayscale value corresponding to the preset grayscale value at the preset refresh rate based on the target brightness value.

[0048] For example, the reference gray level value corresponding to 90 gray levels at 60 Hz can be obtained based on the target brightness value corresponding to 90 gray levels at 240 Hz. For instance, if the brightness value corresponding to 100 gray levels at 60 Hz is equal to or the target brightness value corresponding to 90 gray levels at 240 Hz is less than 0.1, then the reference gray level value corresponding to 90 gray levels at 60 Hz is 100 gray levels.

[0049] S3. Calculate the difference between the reference grayscale value and multiple preset grayscale values ​​respectively to obtain the grayscale compensation value corresponding to any grayscale value at the preset refresh frequency.

[0050] For example, by calculating the difference between 100 gray levels and 90 gray levels, we can obtain the gray level compensation value of 10 corresponding to 90 gray levels at 60 Hz.

[0051] S4. Establish a preset lookup table that includes the correspondence between preset refresh rate, preset grayscale value and grayscale compensation value.

[0052] For example, the preset refresh rate is 60, the preset grayscale value is 90, and the grayscale compensation value is 10.

[0053] S202. Calculate the first reference gray level value based on the first initial gray level value and the first gray level compensation value.

[0054] For example, if the first refresh rate is 60 Hz, the first initial grayscale value is 90, and the first grayscale compensation value is 10, then the first reference grayscale value is 100.

[0055] S30. Drive the display panel to display the first target image based on the first reference grayscale value.

[0056] In the embodiments of this application, the brightness of the first initial image is compensated according to the first grayscale compensation value to drive the display panel to display the first target image.

[0057] S40. Obtain the second initial grayscale value of the second initial screen at the second refresh rate.

[0058] In embodiments of this application, the second initial grayscale value is the average of the grayscale values ​​corresponding to the second initial image of multiple pixels within a preset area of ​​the display panel. Specifically, the preset area includes a central area and / or a non-central area. For example, the first initial grayscale value is the average of the grayscale values ​​corresponding to the first initial image of multiple pixels within the central area of ​​the display panel, and the second initial grayscale value is the average of the grayscale values ​​corresponding to the second initial image of multiple pixels within the central area of ​​the display panel. And / or, the first initial grayscale value is the average of the grayscale values ​​corresponding to the first initial image of multiple pixels within a non-central area of ​​the display panel, and the second initial grayscale value is the average of the grayscale values ​​corresponding to the second initial image of multiple pixels within a non-central area of ​​the display panel.

[0059] In the embodiments of this application, the difference between the first refresh frequency and the second refresh frequency is greater than the preset frequency difference, and the difference between the first initial grayscale value and the second initial grayscale value is less than the preset grayscale difference.

[0060] Specifically, the preset frequency difference is greater than or equal to 10 Hz, and the preset grayscale difference is between 0 and 5 grayscale levels. For example, one of the first refresh rate and the second refresh rate is less than or equal to 60 Hz, and the other of the first refresh rate and the second refresh rate is greater than or equal to 70 Hz. For example, the first initial grayscale value and the second initial grayscale value are equal, that is, the preset grayscale difference is equal to 0. That is, the first initial grayscale value of the first initial image and the initial grayscale value of the second initial image are equal, but the difference between the first refresh rate and the second refresh rate is equal to the preset frequency difference.

[0061] S50. Obtain the second reference grayscale value corresponding to the second refresh frequency and the second initial grayscale value according to the preset lookup table.

[0062] In an embodiment of this application, step S50 specifically includes: obtaining a second grayscale compensation value corresponding to the second refresh rate and the second initial grayscale value according to a preset lookup table; and calculating a second reference grayscale value based on the second initial grayscale value and the second grayscale compensation value.

[0063] S60. Determine whether the difference between the first reference grayscale value and the second reference grayscale value is greater than a preset threshold.

[0064] In the embodiments of this application, the preset threshold is equal to the difference between the maximum and minimum values ​​among multiple grayscale compensation values ​​in a preset lookup table. For example, in the preset lookup table, the maximum value among multiple grayscale compensation values ​​corresponding to grayscale levels 0 to 255 at 60 Hz is 100 grayscale and the minimum value is 30 grayscale; in the preset lookup table, the maximum value among multiple grayscale compensation values ​​corresponding to grayscale levels 0 to 255 at 120 Hz is 60 grayscale and the minimum value is 20 grayscale; and in the preset lookup table, the maximum value among multiple grayscale compensation values ​​corresponding to grayscale levels 0 to 255 at 180 Hz is 30 grayscale and the minimum value is 5 grayscale. Then, the preset threshold is equal to 100 grayscale minus 5 grayscale, that is, the preset threshold is equal to 95 grayscale.

[0065] S70. If the difference is greater than the preset threshold, then obtain the overdrive grayscale value corresponding to the first reference grayscale value and the second reference grayscale value.

[0066] For example, if the first reference grayscale value is 100 grayscale and the second reference grayscale value is 200 grayscale, then the difference between the first and second reference grayscale values ​​is 100 grayscale. In this case, the difference between the first and second reference grayscale values ​​is greater than a preset threshold. Therefore, the overdrive grayscale value corresponding to the first and second reference grayscale values ​​is obtained according to the overdrive lookup table. That is, the OD function is only activated when the difference between the first and second reference grayscale values ​​is greater than the preset threshold. This avoids the display panel mistakenly triggering the OD function due to different grayscale compensation values ​​at different refresh rates, which could affect the grayscale compensation value under VDF and reduce the grayscale compensation effect.

[0067] S80: Drive the display panel to display the second target image based on the overdrive grayscale value.

[0068] In the embodiments of this application, a corresponding first driving voltage compensation value is provided to the display panel based on a first reference grayscale value to drive the display panel to display a first target image. A corresponding second driving voltage compensation value is provided to the display panel based on a second reference grayscale value to drive the display panel to display a second target image.

[0069] like Figure 6 As shown, the driving method also includes:

[0070] S90. If the difference is less than the preset threshold, the display panel is driven to display the second target image according to the second reference grayscale value.

[0071] Specifically, the driving methods include:

[0072] S10. Obtain the first initial grayscale value of the first initial screen at the first refresh rate.

[0073] S20. Obtain the first reference grayscale value corresponding to the first refresh frequency and the first initial grayscale value according to the preset lookup table.

[0074] S30. Drive the display panel to display the first target image based on the first reference grayscale value.

[0075] S40. Obtain the second initial grayscale value of the second initial screen at the second refresh rate.

[0076] S50. Obtain the second reference grayscale value corresponding to the second refresh frequency and the second initial grayscale value according to the preset lookup table.

[0077] S60. Determine whether the difference between the first reference grayscale value and the second reference grayscale value is greater than a preset threshold.

[0078] S70. If the difference is greater than the preset threshold, then obtain the overdrive grayscale value corresponding to the first reference grayscale value and the second reference grayscale value.

[0079] S80: Drive the display panel to display the second target image based on the overdrive grayscale value.

[0080] S90. If the difference is less than a preset threshold, the display panel is driven to display the second target image based on the second reference grayscale value.

[0081] In the embodiments of this application, if the difference between the first reference grayscale value and the second reference grayscale value is less than a preset threshold, the OD function is disabled, and the display panel is driven to display the first target image based on the first reference grayscale value. The display panel is driven to display the second target image based on the second reference grayscale value.

[0082] The display panel driving method and display device provided in this application obtain a first initial grayscale value of a first initial image at a first refresh rate and a second initial grayscale value of a second initial image at a second refresh rate. A first reference grayscale value corresponding to the first refresh rate and the first initial grayscale value is obtained according to a preset lookup table, and a second reference grayscale value corresponding to the second refresh rate and the second initial grayscale value is obtained. It is determined whether the difference between the first reference grayscale value and the second reference grayscale value is greater than a preset threshold. If the difference is greater than the preset threshold, an overdrive grayscale value corresponding to the first reference grayscale value and the second reference grayscale value is obtained. The display panel is driven to display a first target image according to the first reference grayscale value, and the display panel is driven to display a second target image according to the overdrive grayscale value. That is, whether to enable the OD function is determined based on whether the difference between the first reference grayscale value and the second reference grayscale value is greater than a preset threshold, thereby improving the conflict between the OD function and the VDF function and enhancing the grayscale compensation effect.

[0083] The above provides a detailed description of a display panel driving method and display device provided by the embodiments of this application. The description of the above embodiments is only for the purpose of helping to understand the core ideas of this application, and the above description should not be construed as a limitation on the scope of protection of this application.

Claims

1. A driving method of a display panel, characterized by, The picture to be displayed by the display panel comprises a first initial picture and a second initial picture in succession, and the driving method comprises the following steps: obtaining a first initial gray scale value of the first initial picture under a first refresh frequency; the first initial gray scale value is an average value of gray scale values corresponding to the first initial picture input to a plurality of pixels in a preset area of the display panel; the preset area comprises a central area and / or a non-central area; obtaining a first reference gray scale value corresponding to the first refresh frequency and the first initial gray scale value according to a preset correspondence table; driving the display panel to display a first target picture according to the first reference gray scale value; obtaining a second initial gray scale value of the second initial picture under a second refresh frequency; obtaining a second reference gray scale value corresponding to the second refresh frequency and the second initial gray scale value according to the preset correspondence table; judging whether a difference between the first reference gray scale value and the second reference gray scale value is greater than a preset threshold value; if the difference is greater than the preset threshold value, obtaining an overdrive gray scale value corresponding to the first reference gray scale value and the second reference gray scale value; driving the display panel to display a second target picture according to the overdrive gray scale value; wherein the step of obtaining the first reference gray scale value corresponding to the first refresh frequency and the first initial gray scale value according to the preset correspondence table comprises the following steps: obtaining a first gray scale compensation value corresponding to the first refresh frequency and the first initial gray scale value according to the preset correspondence table; the preset correspondence table comprises a corresponding relationship among refresh frequencies, gray scale values and gray scale compensation values; calculating the first reference gray scale value according to the first initial gray scale value and the first gray scale compensation value.

2. The driving method of the display panel according to claim 1, wherein the step of obtaining the second reference gray scale value corresponding to the second refresh frequency and the second initial gray scale value according to the preset correspondence table comprises the following steps: obtaining a second gray scale compensation value corresponding to the second refresh frequency and the second initial gray scale value according to the preset correspondence table; calculating the second reference gray scale value according to the second initial gray scale value and the second gray scale compensation value. The preset threshold value is equal to a difference between a maximum value and a minimum value of a plurality of gray scale compensation values in the preset correspondence table.

3. The driving method of the display panel according to claim 2, wherein The driving method further comprises the following steps:

4. The driving method of a display panel according to claim 1, wherein if the difference is less than the preset threshold value, driving the display panel to display the second target picture according to the second reference gray scale value. The second initial gray scale value is an average value of gray scale values corresponding to the second initial picture input to a plurality of pixels in a preset area of the display panel.

5. The driving method of a display panel according to claim 1, wherein The driving method further comprises the following steps:

6. The driving method of a display panel according to claim 1, wherein obtaining a target luminance value of the display panel under a preset gray scale value; obtaining a reference gray scale value corresponding to the preset gray scale value under a preset refresh frequency according to the target luminance value; calculating a difference between the reference gray scale value and a plurality of preset gray scale values respectively to obtain a gray scale compensation value corresponding to any gray scale value under the preset refresh frequency; establishing the preset correspondence table comprising a corresponding relationship among the preset refresh frequency, the preset gray scale value and the gray scale compensation value. ​ 7. The driving method of the display panel according to claim 1, wherein The difference between the first refresh frequency and the second refresh frequency is greater than a preset frequency difference, and the difference between the first initial gray scale value and the second initial gray scale value is less than a preset gray scale difference.

8. The driving method of the display panel according to claim 7, wherein The preset frequency difference is greater than or equal to 10 Hz, and the preset gray scale difference is between 0 gray scale and 5 gray scale.

9. A display device, characterized by comprising: Comprise: The display panel comprises a plurality of pixels arranged in an array, and the plurality of pixels are used to display a picture, and the picture to be displayed by the display panel comprises a first initial picture and a second initial picture in sequence; The driving circuit is electrically connected with the display panel, and the driving circuit comprises: The acquisition module is used to acquire a first initial gray scale value of the first initial picture at a first refresh frequency and a second initial gray scale value of the second initial picture at a second refresh frequency, and is used to acquire a first reference gray scale value corresponding to the first refresh frequency and the first initial gray scale value and a second reference gray scale value corresponding to the second refresh frequency and the second initial gray scale value according to a preset correspondence table; the first initial gray scale value is an average value of gray scale values corresponding to the first initial picture input to a plurality of pixels in a preset area of the display panel; the preset area comprises a central area and / or a non-central area; The judgment module is used to judge whether the difference between the first reference gray scale value and the second reference gray scale value is greater than a preset threshold value; The driving module is used to acquire an overdrive gray scale value corresponding to the first reference gray scale value and the second reference gray scale value if the difference is greater than the preset threshold value; and is used to drive the display panel to display a first target picture according to the first reference gray scale value and to display a second target picture according to the overdrive gray scale value; The acquisition module is also used to acquire a first gray scale compensation value corresponding to the first refresh frequency and the first initial gray scale value according to the preset correspondence table, and the preset correspondence table comprises a corresponding relationship among refresh frequency, gray scale value and gray scale compensation value; and the first reference gray scale value is calculated according to the first initial gray scale value and the first gray scale compensation value.

10. The display device according to claim 9, wherein The judgment module comprises a comparator, a first input end of the comparator is electrically connected with a first voltage input end, a second input end of the comparator is electrically connected with the acquisition module, an output end of the comparator is electrically connected with the driving module, and the output end of the comparator is used to output a control signal to the driving module, and the driving module is used to output an overdrive gray scale value according to the control signal; The first voltage input end inputs a first voltage value corresponding to the preset threshold value to the first input end, and the acquisition module inputs a second voltage value corresponding to the difference to the second input end.

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