Brightness compensation method and device for display panel

Abstract

The invention discloses a brightness compensation method and device of a display panel. The display panel at least comprises a first display area and a second display area, and the brightness compensation method of the display panel comprises the following steps: when the first display area is refreshed at a first frequency and the second display area is refreshed at a second frequency, determining a first compensation value of the second display area according to a gray-scale value of the second display area; determining a correction coefficient according to the display brightness value and the gray-scale value of the second display area; correcting the first compensation value according to the correction coefficient; wherein the first frequency is greater than the second frequency. After the first compensation value corresponding to the display area with the low refresh frequency is determined, the first compensation value is corrected again according to the correction coefficient, so that the final compensation value of the display area is more accurate, the brightness compensation of the second display area with the low refresh frequency is more accurate, the brightness compensation effect is improved, and the user experience is improved. The problem that display of a display panel is dark or bright in a part of a display area when the display panel is refreshed in a partition mode is solved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a brightness compensation method and device for a display panel. Background Art

[0002] As people's living standards improve, they are surrounded by electronic products all the time, so the demand for display panels is increasing and display technology has developed rapidly.

[0003] However, as display requirements increase, in some display scenarios, some areas of the display panel may appear too dark or too bright. Summary of the invention

[0004] The present invention provides a brightness compensation method and device for a display panel, so as to solve the problem that the display in a partial display area of ​​the display panel is too dark or too bright when the display panel is refreshed in different areas.

[0005] According to one aspect of the present invention, a brightness compensation method for a display panel is provided, wherein a display area of ​​the display panel includes at least a first display area and a second display area, and the brightness compensation method for the display panel includes:

[0006] When the first display area is refreshed at a first frequency and the second display area is refreshed at a second frequency:

[0007] determining a first compensation value of the second display area according to the grayscale value of the second display area;

[0008] determining a correction coefficient according to a display brightness value and a grayscale value of the second display area;

[0009] Correcting the first compensation value according to the correction coefficient;

[0010] The first frequency is greater than the second frequency.

[0011] Optionally, determining the first compensation value of the second display area according to the grayscale value of the second display area includes:

[0012] determining a first compensation value for the second display area according to a grayscale value of the second display area and a corresponding relationship between the grayscale value of the second display area and the first compensation value;

[0013] Optionally, determining the correction coefficient according to the display brightness value and grayscale value of the second display area includes:

[0014] The correction coefficient corresponding to the second display area is determined according to the display brightness value and the grayscale value of the second display area, and the corresponding relationship between the grayscale value under the display brightness value of the second display area and the correction coefficient.

[0015] Optionally, the driving chip corresponding to the display panel includes a gamma circuit, and the gamma circuit is used to output a gamma voltage;

[0016] Determining the first compensation value of the second display area according to the grayscale value of the second display area and the corresponding relationship between the grayscale value of the second display area and the first compensation value includes:

[0017] Determining a first compensation coefficient corresponding to the second display area according to the grayscale value of the second display area and a corresponding relationship between the grayscale value of the second display area and the first compensation coefficient;

[0018] A first compensation coefficient, a gamma pressure difference value and the accuracy of the gamma circuit corresponding to the second display area are calculated to obtain a first compensation value of the second display area; the gamma pressure difference value is a difference between a maximum value of the gamma voltage output by the gamma circuit and a minimum value of the gamma voltage;

[0019] Optionally, the first compensation value of the second display area is the product of the first compensation coefficient and a gamma step length, and the gamma step length is a ratio of the gamma pressure difference value to the accuracy of the gamma circuit;

[0020] Optionally, correcting the first compensation value according to the correction coefficient includes:

[0021] The product of the correction coefficient and the first compensation value is used as the corrected compensation value.

[0022] Optionally, the second display area includes a plurality of display sub-areas, and determining the first compensation value of the second display area according to the grayscale value of the second display area and the corresponding relationship between the grayscale value of the second display area and the first compensation value includes:

[0023] For any of the display sub-areas in the second display area:

[0024] Determining a first compensation coefficient corresponding to the display sub-area according to the grayscale value of the display sub-area and a corresponding relationship between the grayscale value of the display sub-area and the first compensation coefficient;

[0025] Performing calculation on a first compensation coefficient corresponding to the display sub-area, a gamma pressure difference value, and the accuracy of the gamma circuit to obtain a first compensation value of the display sub-area;

[0026] Determining the correction coefficient according to the display brightness value and the grayscale value of the second display area includes:

[0027] A correction coefficient is determined according to the display brightness value and the grayscale value of the display sub-area.

[0028] Optionally, before determining the first compensation coefficient corresponding to the second display area according to the grayscale value of the second display area and the correspondence between the grayscale value of the second display area and the first compensation coefficient, the method further includes:

[0029] Acquire a first preset compensation table; the first preset compensation table includes a plurality of binding point grayscale values ​​and a first compensation coefficient corresponding to each of the display sub-areas at each of the binding point grayscale values;

[0030] For any display subarea:

[0031] When the grayscale value of the display sub-area is equal to any one of the binding point grayscale values, determining the corresponding relationship between the grayscale value of the display sub-area and the first compensation coefficient from the first preset compensation table by looking up the table;

[0032] When the grayscale value of the display sub-area is not equal to any of the binding point grayscale values, the corresponding relationship between the grayscale value of the display sub-area and the first compensation coefficient is determined according to the first preset compensation table and by interpolation.

[0033] Optionally, determining the correction coefficient corresponding to the second display area according to the display brightness value and grayscale value of the second display area, and the correspondence between the grayscale value under the display brightness value of the second display area and the correction coefficient includes:

[0034] For any display subarea:

[0035] Determine the correction coefficient corresponding to the display sub-area according to the display brightness value and the grayscale value of the display sub-area, and the corresponding relationship between the grayscale value under the display brightness value of the display sub-area and the correction coefficient; wherein the display brightness values ​​of the display sub-areas are the same;

[0036] Before determining the correction coefficient corresponding to the display sub-area according to the display brightness value and the grayscale value of the display sub-area, and the corresponding relationship between the grayscale value under the display brightness value of the display sub-area and the correction coefficient, the method further includes:

[0037] Obtain a second preset compensation table; the second preset compensation table includes a plurality of binding point display brightness values, a plurality of binding point grayscale values, and correction coefficients corresponding to the binding point grayscale values ​​under the binding point display brightness values; wherein each of the display sub-areas corresponds to the same second preset compensation table;

[0038] When the grayscale value of the display sub-area is equal to any one of the binding point grayscale values ​​and the display brightness value of the display sub-area is equal to any one of the binding point display brightness values, the corresponding relationship between the grayscale value under the display brightness value of the display sub-area and the correction coefficient is determined from the second preset compensation table by looking up the table;

[0039] When the grayscale value of the display sub-area is not equal to any of the binding point grayscale values ​​and / or the display brightness value of the display sub-area is not equal to any of the binding point display brightness values, the correspondence between the grayscale value under the display brightness value of the display sub-area and the correction coefficient is determined by interpolation according to the second preset compensation table.

[0040] Optionally, in different division modes of dividing the display panel into at least a first display area and a second display area, the second display areas corresponding to the different division modes correspond to the same first preset compensation table.

[0041] Optionally, in different division modes of dividing the display panel into at least a first display area and a second display area, the second display areas corresponding to different division modes correspond to different first preset compensation tables;

[0042] Before determining the first compensation coefficient corresponding to the display sub-area according to the grayscale value of the display sub-area and the corresponding relationship between the grayscale value of the display sub-area and the first compensation coefficient, the method further includes:

[0043] Establishing multiple test groups, wherein the test groups include a first display area of ​​a binding point and a second display area of ​​a binding point, and positions of the first display area of ​​the binding point and positions of the second display area of ​​the binding point are different in different test groups;

[0044] Establishing a plurality of refresh frequency groups, wherein the refresh frequency groups include a first binding point frequency and a second binding point frequency;

[0045] For any test group, a binding point compensation table corresponding to the test group under each refresh frequency group is established;

[0046] determining the test group to which the first display area and the second display area belong according to positions of the first display area and the second display area in the display panel;

[0047] The first preset compensation table is determined according to the binding point compensation table corresponding to each refresh frequency group under the test group, the first frequency and the second frequency.

[0048] Optionally, for any test group, establishing a binding point compensation table corresponding to the test group under any refresh frequency group includes:

[0049] Select m grayscale values ​​from a plurality of grayscale values ​​as the binding point grayscale values; m is an integer greater than or equal to 2;

[0050] Refreshing a first display area of ​​a binding point of a test display panel at the first binding point frequency, and refreshing a second display area of ​​a binding point of the test display panel at the second binding point frequency;

[0051] For any of the binding point grayscale values:

[0052] Lighting up the second display area of ​​the binding point with the grayscale value of the binding point under the preset display brightness value, and collecting the actual brightness of each of the display sub-areas in the second display area of ​​the binding point;

[0053] generating a first compensation coefficient for each of the display sub-areas according to the actual brightness of each of the display sub-areas and the target brightness corresponding to the grayscale value of the binding point under the preset display brightness value;

[0054] The binding point compensation table is generated according to the first compensation coefficients corresponding to the display sub-areas at the binding point grayscale values.

[0055] Optionally, generating the second preset compensation table includes:

[0056] Selecting h binding point display brightness values ​​from a plurality of display brightness values; h is an integer greater than or equal to 2;

[0057] For any binding point display brightness value of any display sub-area, at any binding point grayscale value, according to the compensated brightness corresponding to the first compensation value and the target brightness corresponding to the binding point grayscale value of the display sub-area at the binding point display brightness value, generate a second compensation coefficient corresponding to the binding point grayscale value at the binding point display brightness value;

[0058] The second compensation coefficient corresponding to any display sub-area that meets the preset condition is used as the correction coefficient; the preset condition is: the absolute value of the difference between the first brightness of each of the display sub-areas and the target brightness corresponding to the binding point grayscale value under the binding point display brightness value is smaller than the absolute value of the difference between the second brightness and the target brightness corresponding to the binding point grayscale value under the binding point display brightness value; the first brightness is the brightness of the display sub-area when it is lit under the data voltage generated by the first compensation value; the second brightness is the brightness of the display sub-area when it is lit under the data voltage generated after the first compensation value is corrected according to the second compensation coefficient;

[0059] If there is no second compensation coefficient that meets the preset condition under the binding point grayscale value under the display brightness value, the correction coefficient corresponding to the binding point grayscale value under the display brightness value is set to 1.

[0060] Optionally, before determining the first compensation value of the second display area according to the grayscale value of the second display area, the method includes:

[0061] Acquire a display brightness value of the second display area;

[0062] When the display brightness value is less than a display brightness threshold, a first compensation value of the second display area is determined according to the grayscale value of the second display area; wherein the preset display brightness value is less than or equal to the display brightness threshold.

[0063] Optionally, the display panel includes a gate driving circuit, the gate driving circuit is connected to a clock signal and a frequency cutting signal; the gate driving circuit is used to output a scanning signal of a first frequency to at least the first display area and a scanning signal of a second frequency to the second display area according to the frequency cutting signal;

[0064] A driving cycle of the second display area includes a holding frame and a refresh frame. In the refresh frame, the clock signal is controlled to be a pulse signal; in the holding frame, the clock signal is controlled to be an invalid potential; the invalid potential is a potential that controls the transistor connected to the clock signal in the gate drive circuit to turn off; wherein, the invalid potential is a DC potential.

[0065] Optionally, the display panel includes a plurality of rows of sub-pixels, each sub-pixel row is refreshed row by row, the first display area and the second display area are arranged along a column direction of the sub-pixels, and the second display area is refreshed later than the first display area.

[0066] Optionally, after correcting the first compensation value according to the correction coefficient, the method further includes:

[0067] Brightness compensation is performed on each sub-pixel row in the second display area according to the corrected first compensation value.

[0068] Optionally, the first display area and the second display area are arranged adjacent to each other;

[0069] Brightness compensation is performed on each sub-pixel row in the second display area starting from the L+1th sub-pixel row; wherein the Lth sub-pixel row is the sub-pixel row refreshed last in the first display area, and L is an integer greater than or equal to 1.

[0070] Optionally, the second display area includes n rows of sub-pixel rows, where n is an integer greater than or equal to 2, and after the first compensation value is corrected according to the correction coefficient, the method further includes:

[0071] Brightness compensation is performed on sub-pixel rows from the L+mth row to the nth row in the second display area of ​​the display panel according to the corrected first compensation value; wherein the nth row of sub-pixel rows is the sub-pixel row refreshed latest in the second display area, the Lth row of sub-pixel rows is the sub-pixel row refreshed latest in the first display area, m is an integer greater than or equal to 2, L is an integer greater than or equal to 1, and m is less than or equal to n.

[0072] Optionally, the display panel at least includes a first gate driving circuit for outputting a scanning signal of a first frequency to the first display area and a second gate driving circuit for outputting a scanning signal of a second frequency to the second display area, and the first gate driving circuit and the second gate driving circuit are connected to different clock signals;

[0073] A driving cycle of the second display area includes a holding frame and a refresh frame. In the refresh frame, the clock signal controlling the second gate drive circuit to be connected is a pulse signal; in the holding frame, the clock signal controlling the second gate drive circuit to be connected is an invalid potential; the invalid potential is a potential for controlling the transistor in the gate drive circuit that is connected to the clock signal to be turned off.

[0074] According to another aspect of the present invention, a brightness compensation method for a display panel is provided, wherein a display area of ​​the display panel includes at least a first display area and a second display area, and the display panel further includes a gate drive circuit, wherein the gate drive circuit is connected to a clock signal and a frequency cutting signal; the gate drive circuit is used to output a scanning signal of a first frequency to at least the first display area and a scanning signal of a second frequency to the second display area according to the frequency cutting signal; wherein the first frequency is greater than the second frequency;

[0075] The brightness compensation method of the display panel includes:

[0076] A display compensation value of the second display area is determined according to display data of the second display area; wherein the display data includes a grayscale value and / or a display brightness value.

[0077] According to another aspect of the present invention, a brightness compensation device for a display panel is provided, wherein a display area of ​​the display panel includes at least a first display area and a second display area;

[0078] The brightness compensation device of the display panel comprises:

[0079] A first compensation value generating module is used to determine a first compensation value according to the grayscale value of the second display area when refreshing the first display area at a first frequency and refreshing the second display area at a second frequency; wherein the first frequency is greater than the second frequency

[0080] A correction coefficient generating module, used for determining the correction coefficient according to the display brightness value and grayscale value of the second display area;

[0081] A brightness correction module is used to correct the first compensation value according to the correction coefficient.

[0082] The technical solution of the embodiment of the present invention is that when different areas of the display panel are refreshed at different frequencies, the first compensation value corresponding to the display area at the grayscale value is determined according to the grayscale value of the display area with a lower refresh frequency. In order to improve the compensation effect of the display area with a lower refresh frequency, a correction coefficient can be further determined according to the display brightness value and the grayscale value, and the first compensation value is corrected by the correction coefficient. After determining the first compensation value corresponding to the display area with a lower refresh frequency, the first compensation value is corrected again according to the correction coefficient, so that the final compensation value of the display area is more accurate, and then the brightness compensation of the second display area with a lower refresh frequency is more accurate, thereby improving the brightness compensation effect, and solving the problem of dark or bright display in some display areas when the display panel is refreshed in different areas.

[0083] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0085] Figure 1 A display brightness comparison diagram of different display areas of a display panel;

[0086] Figure 2 A flow chart of a brightness compensation method for a display panel provided by an embodiment of the present invention;

[0087] Figure 3 A flowchart of another brightness compensation method for a display panel provided by an embodiment of the present invention;

[0088] Figure 4 A flowchart of another brightness compensation method for a display panel provided by an embodiment of the present invention;

[0089] Figure 5 A display sub-area division diagram of a display panel provided by an embodiment of the present invention;

[0090] Figure 6 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention;

[0091] Figure 7 A timing diagram of a clock signal provided by an embodiment of the present invention;

[0092] Figure 8 A schematic structural diagram of a brightness compensation device for a display panel provided by an embodiment of the present invention;

[0093] Fig. 9 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0094] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0095] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0096] As described in the background technology, the relevant display panel may have the problem that some areas of the display panel display darker or brighter in some display scenarios. The inventors have found that the reason is that when refreshing different display areas of the display panel at different frequencies, the transistor conduction frequencies used to write data voltages to the pixel circuit in the high refresh area and the low refresh area are different, which leads to the problem that the low refresh area has a darker or brighter display brightness. Specifically, the display panel includes multiple rows of sub-pixels, and the sub-pixels include pixel circuits and light-emitting devices. The pixel circuit is used to drive the connected light-emitting devices to emit light. The pixel circuit includes a driving transistor and a data writing transistor, and the data writing transistor is connected to the source or drain of the driving transistor. Taking the connection of the source as an example, when different display areas of the display panel are refreshed at different frequencies, the data writing transistors of the pixel circuits in different display areas are turned on for different times in the same time. In the high refresh area, the number of times the data writing transistor is turned on in one second is greater than the number of times the data writing transistor is turned on in one second in the low refresh area, which makes the source reset times of the driving transistors in different display areas different, and the hysteresis effect of the driving transistor is different, resulting in the problem of darker or brighter brightness in the low refresh area. Exemplary, Figure 1 A display brightness comparison diagram of different display areas of a display panel. Figure 1 The display panel exemplarily shows that the third display area 3, the first display area 1 and the second display area 2, wherein the third display area 3 and the second display area 2 are refreshed at a frequency of 1HZ, and the first display area 1 is refreshed at a frequency of 120HZ. Since the data writing transistor in the second display area 2 is in the off state most of the time, the frequency reduction measure causes the state of the storage capacitor connected to the driving transistor in the pixel circuit to change, resulting in a problem of dim brightness.

[0097] In view of the above technical problems, an embodiment of the present invention provides a brightness compensation method for a display panel, so that when different areas of the display panel are refreshed at different frequencies, a first compensation value is determined for a low-frequency area, so as to solve the problem that the display of a part of the display area is dark or bright when the display panel is refreshed in different areas. At the same time, the first compensation value is further corrected by a correction coefficient to improve the accuracy of the brightness compensation and improve the display effect after compensation.

[0098] Figure 2 A flow chart of a brightness compensation method for a display panel provided in an embodiment of the present invention, wherein the display area of ​​the display panel includes at least a first display area and a second display area, and Figure 2 , the brightness compensation method of the display panel includes:

[0099] When the first display area is refreshed at the first frequency and the second display area is refreshed at the second frequency:

[0100] S110: Determine a first compensation value of the second display area according to the grayscale value of the second display area.

[0101] The display panel includes multiple rows of sub-pixels, and the display panel can be divided into at least a first display area and a second display area according to the column direction of the sub-pixel arrangement. The first frequency is greater than the second frequency. For example, the first frequency is 120HZ, and the second frequency is 1HZ. The first display area is refreshed at 120HZ, and the second display area is refreshed at 1HZ, that is, within one second, any sub-pixel in the first display area writes the data voltage 120 times, and any sub-pixel in the second display area writes the data voltage once. There is a preset corresponding relationship between the grayscale value of the display panel and the first compensation value. After the grayscale value of the second display area is determined, the corresponding first compensation value can be obtained.

[0102] Optionally, the first compensation value of the second display area is determined according to the grayscale value of the second display area and the corresponding relationship between the grayscale value of the second display area and the first compensation value.

[0103] A correspondence between a plurality of grayscale values ​​and a first compensation value is established in advance, wherein the first compensation value may be a compensation amount of a grayscale value or a compensation amount of a data voltage, which is not specifically limited in this embodiment. The grayscale value of the second display area may be an average value of the grayscale values ​​of each sub-pixel in the second display area. A driving cycle of a sub-pixel includes a writing frame and a holding frame. In the writing frame, a data voltage is written into a driving transistor in a pixel circuit, and the driving transistor generates a driving current according to the data voltage to drive the light-emitting device of the sub-pixel to emit light. In the holding frame, no data voltage is written to the pixel circuit. Before entering the writing frame of the next driving cycle, the grayscale values ​​of each sub-pixel under the writing frame of the next driving cycle are obtained, and then the average value is obtained by calculation according to the grayscale values ​​of each sub-pixel as the grayscale value of the second display area. From the correspondence between the plurality of grayscale values ​​and the first compensation value established in advance, the correspondence between the grayscale value of the second display area and the first compensation value is determined by searching or interpolating, and then the corresponding first compensation value is obtained according to the grayscale value of the second display area in the next driving cycle.

[0104] S120: Determine a correction coefficient according to the display brightness value and the grayscale value of the second display area.

[0105] Display devices such as mobile phones and computers usually include brightness adjustment buttons, and users use the brightness adjustment buttons to change the input display brightness level, which is also called display brightness value (DBV). Among them, each display brightness value can correspond to a display brightness of the maximum grayscale in the display panel. After the display brightness corresponding to the maximum grayscale in the display panel changes, the display brightness corresponding to other grayscales will also change. Specifically, when the display brightness corresponding to the maximum grayscale in the display panel increases, the display brightness corresponding to other grayscales also increases; when the display brightness corresponding to the maximum grayscale in the display panel decreases, the display brightness corresponding to other grayscales also decreases. Therefore, it can also be understood that each input display brightness value can correspond to a brightness level of the display panel. When the display brightness corresponding to the maximum grayscale in the display panel is large, the brightness level is large, and the overall display brightness of the display panel is large; when the display brightness corresponding to the maximum grayscale in the display panel is small, the brightness level is small, and the overall display brightness of the display panel is small.

[0106] The display brightness value DBV and grayscale value of the second display area in the next driving cycle can be regarded as a set of display parameters, and the set of display parameters corresponds to the correction coefficient. After determining the display brightness value and grayscale value of the second display area in the next driving cycle, the corresponding correction coefficient can be obtained. Optionally, the correction coefficient corresponding to the second display area is determined according to the display brightness value and grayscale value of the second display area, and the correspondence between the grayscale value and the correction coefficient under the display brightness value of the second display area. The display brightness value and the grayscale value are regarded as a set of display parameters, and a correspondence between multiple sets of display parameters and correction coefficients is established in advance. The correspondence between the display parameters and the correction coefficient of the second display area in the next driving cycle is determined by table lookup or interpolation from the multiple sets of correspondences, and then the correction coefficient corresponding to the second display area can be determined.

[0107] S130: Correct the first compensation value according to the correction coefficient.

[0108] The first compensation value is corrected according to the correction coefficient, that is, the correction coefficient and the first compensation value are calculated to obtain the final compensation value. In order to simplify the calculation process and the occupation of storage space, each sub-pixel in the second display area can correspond to the same first compensation value. Further, for any sub-pixel in the second display area, a final compensated data voltage is generated according to the final compensation value to drive the sub-pixel to display, thereby realizing brightness compensation for the second display area. Taking the first compensation value as the compensation amount of the data voltage as an example, the final compensation value is obtained according to the calculation of the correction coefficient and the first compensation value. For any sub-pixel in the second display area, the final compensated data voltage is generated according to the sum of the initial data voltage and the final compensation value of the sub-pixel in the write frame of the next drive cycle. In the write frame of the next drive cycle, the light-emitting device in the sub-pixel is driven to display with the final compensated data voltage, thereby completing the brightness compensation of each sub-pixel in the second display area.

[0109] The technical solution of the embodiment of the present invention is that when different areas of the display panel are refreshed at different frequencies, the first compensation value corresponding to the display area at the grayscale value is determined according to the grayscale value of the display area with a lower refresh frequency. In order to improve the compensation effect of the display area with a lower refresh frequency, a correction coefficient can be further determined according to the display brightness value and the grayscale value, and the first compensation value is corrected by the correction coefficient. After determining the first compensation value corresponding to the display area with a lower refresh frequency, the first compensation value is corrected again according to the correction coefficient, so that the final compensation value of the display area is more accurate, and then the brightness compensation of the second display area with a lower refresh frequency is more accurate, thereby improving the brightness compensation effect, and solving the problem of dark or bright display in some display areas when the display panel is refreshed in different areas.

[0110] Figure 3 A flowchart of another method for compensating brightness of a display panel provided by an embodiment of the present invention, wherein a driving chip corresponding to the display panel includes a gamma circuit, the gamma circuit is used to output a gamma voltage, and a display device formed by the display panel includes a driving chip, and the driving chip is arranged corresponding to the display panel of the display device to which it belongs, with reference to Figure 3 , the brightness compensation method of the display panel includes:

[0111] S111: Determine a first compensation coefficient corresponding to the second display area according to a grayscale value of the second display area and a corresponding relationship between the grayscale value of the second display area and the first compensation coefficient.

[0112] The first compensation coefficient is an integer, and the maximum value and the minimum value of the first compensation coefficient are opposite numbers to each other, and the maximum value and the minimum value are related to the relevant settings of the driving chip.

[0113] The grayscale value of the display panel corresponds to the first compensation coefficient, and one grayscale value corresponds to one first compensation coefficient. The corresponding relationship between multiple grayscale values ​​and the first compensation coefficient can be established in advance under the preset display brightness value, and then according to the multiple groups of corresponding relationships between the multiple grayscale values ​​and the first compensation coefficient, the corresponding relationship between the grayscale value of the second display area and the first compensation coefficient can be determined by searching or interpolating, and then the first compensation coefficient corresponding to the grayscale value of the second display area is obtained. When determining the first compensation coefficient, the size of the display brightness value of the write frame of the second display area in the next driving cycle is not considered, and the corresponding first compensation coefficient is determined only according to the size of the grayscale value of the second display area. That is, no matter at which display brightness value, the first compensation coefficient corresponding to the grayscale value of the second display area in the next driving cycle is determined according to the relationship between the grayscale value and the first compensation coefficient established under the preset display brightness value.

[0114] S121: Calculate the first compensation coefficient, the gamma voltage difference value and the accuracy of the gamma circuit corresponding to the second display area to obtain the first compensation value of the second display area; the gamma voltage difference value is the difference between the maximum value and the minimum value of the gamma voltage output by the gamma circuit.

[0115] The gamma voltage corresponds to the data voltage one by one. The minimum unit of the gamma voltage output can be obtained according to the gamma voltage difference value and the accuracy of the gamma circuit. The first compensation coefficient can characterize the voltage share, and then the first compensation value can be obtained according to the first compensation coefficient and the minimum unit of the gamma voltage output. Among them, the first compensation value is the compensation amount of the data voltage. Optionally, the first compensation value of the second display area is the product of the first compensation coefficient and the gamma step length. The gamma step length is the ratio of the gamma voltage difference value to the accuracy of the gamma circuit. The gamma step length is the minimum unit of the gamma voltage output mentioned above.

[0116] S131: determining a correction coefficient corresponding to the second display area according to a display brightness value and a grayscale value of the second display area, and a correspondence between a grayscale value under the display brightness value of the second display area and the correction coefficient.

[0117] Regardless of the display brightness value, the first compensation coefficient corresponding to the grayscale value of the second display area in the next driving cycle is determined according to the relationship between the grayscale value and the first compensation coefficient established at the preset display brightness value. Therefore, the accuracy of the first compensation value obtained according to the first compensation coefficient is not high and needs to be further corrected.

[0118] A third preset compensation table is established in advance, and the third preset compensation table includes a plurality of binding point display brightness values, a plurality of binding point grayscale values, and correction coefficients corresponding to the binding point grayscale values ​​under the binding point display brightness values.

[0119] When the grayscale value of the second display area is equal to any one of the binding point grayscale values ​​and the display brightness value of the second display area is equal to any one of the binding point display brightness values, the corresponding relationship between the grayscale value and the correction coefficient of the second display area at the display brightness value of the write frame of the next driving cycle is determined from the third preset compensation table by looking up the table;

[0120] When the grayscale value of the written frame in the second display area in the next driving cycle is not equal to any binding point grayscale value and / or the display brightness value of the second display area is not equal to any binding point display brightness value, the correspondence between the grayscale value and the correction coefficient under the display brightness value of the second display area is determined by interpolation according to the third preset compensation table, and then the correction coefficient corresponding to the second display area is determined.

[0121] S141: Correct the first compensation value according to the correction coefficient.

[0122] The product of the correction coefficient and the first compensation value is used as the corrected compensation value.

[0123] In this embodiment, calculations are performed based on the first compensation coefficient corresponding to the second display area, the gamma pressure difference value, and the accuracy of the gamma circuit to obtain a first compensation value for the second display area, and the first compensation value is then corrected using the correction coefficient, thereby making the brightness compensation for the second display area with a lower refresh frequency more accurate and improving the brightness compensation effect.

[0124] Figure 4 A flowchart of another brightness compensation method for a display panel provided by an embodiment of the present invention, Figure 5 A display sub-area division diagram of a display panel provided in an embodiment of the present invention, wherein the second display area includes a plurality of display sub-areas, Figure 4 and Figure 5 Optionally, for any display sub-area in the second display area, the brightness compensation method of the display panel includes:

[0125] S112: Obtain a first preset compensation table. The first preset compensation table includes a plurality of binding point grayscale values ​​and a first compensation coefficient corresponding to each display sub-area at each binding point grayscale value.

[0126] The second display area of ​​the display panel can be divided into a plurality of display sub-areas according to the row direction and / or column direction of the sub-pixels in the display panel. In this embodiment, the second display area 2 is divided into the first display sub-area ① to the sixteenth display sub-area ①. There are 16 display sub-areas in total. Performing brightness compensation on the second display area 2 means performing brightness compensation on all display sub-areas respectively, taking the brightness compensation on the first display sub-area ① as an example.

[0127] Before the display panel leaves the factory, a first preset compensation table can be established by performing multiple tests on the test display panel, and the first preset compensation table is stored in a memory of the display panel to be compensated.

[0128] Table 1 The first preset compensation table

[0129]

[0130] For example, the grayscale value of the display panel ranges from 0 to 255. In the first preset compensation table, the grayscale conversion amount divided by 16 represents the size of the grayscale value of the tie point. In other embodiments, the grayscale value of the tie point can also be directly indicated in the first column of the table. The first row of Table 1 represents 0, 1, 2, and 3, respectively. Figure 5 The first column, second column, third column and fourth column of the second display area 2 when the second display area 2 is divided into display sub-areas. As can be seen from Table 1, the first display sub-area ① to the sixteenth display sub-area are shown as examples when the grayscale values ​​of the binding points are 0, 8, 16 and 32. For the convenience of presentation, only four grayscale values ​​of the binding points are shown in the table, but the actual grayscale values ​​may not be limited to four.

[0131] For a set of refresh frequency groups, the refresh frequency group includes the refresh frequency of the first display area and the refresh frequency of the second display area, and the memory of the display panel to be compensated may only store a corresponding first preset compensation table. That is, in the process of establishing the first preset compensation table in the early stage, the first preset compensation table is established only by testing the position division of the first display area and the second display of the display panel once. Although the position division of the first display area and the second display area of ​​the display panel to be compensated is different from the position division of the first display area and the second display of the test display panel, the first compensation value is still determined with reference to the first preset compensation table to save the occupation of chip space. As the screen display proceeds, the position division of the high refresh area and the low refresh area may change, that is, the position division of the first display area and the second display area may change, and the second display areas at different positions all refer to the same first preset compensation table to determine the first compensation value, that is, under different division methods of dividing the display panel into at least the first display area and the second display area, the second display areas corresponding to the different division methods correspond to the same first preset compensation table. Generating a first preset compensation table in the early stage can reduce the workload in the early stage and reduce the occupation of the storage space by the first preset compensation table. Wherein, the positions of the dividing lines of the first display area and the second display area corresponding to different display areas are different under different division modes. Exemplarily, in one division mode, the first display area is from the 1st sub-pixel row to the 50th sub-pixel row, and the second display area is from the 51st sub-pixel row to the 100th sub-pixel row. In another division mode, the first display area is from the 1st sub-pixel row to the 30th sub-pixel row, and the second display area is from the 31st sub-pixel row to the 100th sub-pixel row. Then, the second display areas corresponding to the two division modes correspond to the same first preset compensation table when performing compensation.

[0132] Alternatively, under different division methods of dividing the display panel into at least a first display area and a second display area, the second display areas corresponding to different division methods correspond to different first preset compensation tables. For a set of refresh frequency groups, when establishing the first preset compensation table in the early stage, the position division of the first display area and the second display area is continuously changed, and a first preset compensation table is established each time the division method is changed, so that during actual compensation, the first compensation value is determined according to the first preset compensation table corresponding to the position division of the test display panel that is closest to the position division of the second display area of ​​the display panel to be compensated under the current working condition. The second display areas corresponding to different division methods correspond to different first preset compensation tables, which is conducive to improving the accuracy of subsequent compensation. Specifically:

[0133] Establish multiple test groups, the test groups include the positions of the first display area of ​​the binding point and the second display area of ​​the binding point, and the positions of the first display area of ​​the binding point and the second display area of ​​the binding point are different in different test groups; establish multiple refresh frequency groups, the refresh frequency groups include the first frequency of the binding point and the second frequency of the binding point; wherein the first frequency of the binding point is the refresh frequency of the first display area of ​​the binding point, and the second frequency of the binding point is the refresh frequency of the second display area of ​​the binding point. For any test group, establish the binding point compensation table corresponding to the test group under each refresh frequency group; determine the test group to which the first display area and the second display area belong according to the positions of the first display area and the second display area in the display panel; determine the first preset compensation table according to the binding point compensation table, the first frequency and the second frequency corresponding to each refresh frequency group under the test group to which it belongs.

[0134] Exemplarily, the test display panel includes 100 rows and 100 columns of sub-pixels. Taking the division of the display area according to the column direction of the sub-pixel arrangement as an example, in the first test group of the multiple test groups established, the first display area of ​​the binding point corresponds to the area from 50 to 70 rows, and the second display area of ​​the binding point corresponds to the area from 71 to 100 rows; in the second test group, the first display area of ​​the binding point corresponds to the area from 30 to 50 rows, and the second display area of ​​the binding point corresponds to the area from 51 to 70 rows, .... Different test groups are established for different position divisions. Different refresh frequency groups are established, and the refresh frequency groups include the refresh frequency of the first display area of ​​the binding point and the refresh frequency of the second display area of ​​the binding point. For example, the refresh frequency group includes three groups, the first group is 120HZ and 1HZ, the second group is 120HZ and 60HZ, and the third group is 200HZ and 1HZ. For any test group, three binding point preset compensation tables are established under the above three refresh frequency groups respectively. First, the test group to which the second display area of ​​the display panel to be compensated belongs is determined according to the position of the second display area of ​​the display panel to be compensated. Specifically, the test group corresponding to the second display area of ​​the binding point in the test group with the largest number of rows overlapping with the second display area of ​​the display panel to be compensated can be used as the test group to which the second display area belongs. After determining the test group to which the second display area belongs, if the group consisting of the first frequency and the second frequency is the same as one of the multiple refresh frequency groups, the binding point compensation table corresponding to the refresh frequency group of the test group to which the second display area belongs is directly used as the first preset compensation table; otherwise, the compensation table corresponding to the group consisting of the first frequency and the second frequency of the test group to which the second display area belongs is determined by interpolation, and the compensation table is used as the first preset compensation table.

[0135] Further, for any test group, establishing a binding point compensation table corresponding to the test group under any refresh frequency group includes:

[0136] Select m grayscale values ​​from a plurality of grayscale values ​​as the binding point grayscale values; m is an integer greater than or equal to 2; refresh the first display area of ​​the binding point of the test display panel at the first binding point frequency, and refresh the second display area of ​​the binding point of the test display panel at the second binding point frequency;

[0137] For any binding point grayscale value:

[0138] Light up the second display area of ​​the binding point with the grayscale value of the binding point under the preset display brightness value, and collect the actual brightness of each display sub-area in the second display area of ​​the binding point;

[0139] Generate a first compensation coefficient for each display sub-area according to the actual brightness of each display sub-area and the target brightness corresponding to the grayscale value of the binding point under the preset display brightness value;

[0140] A binding point compensation table is generated according to the first compensation coefficients corresponding to the respective display sub-areas at the respective binding point grayscale values.

[0141] Exemplarily, the grayscale value of the binding point can be grayscale values ​​such as 0, 8, 16, 32, etc. The preset display brightness value can be set according to user needs, such as the brightness corresponding to the maximum grayscale under the preset display brightness value is 2nit. After lighting the second display area of ​​the binding point with the grayscale value of the binding point under the preset display brightness value, for any display sub-area, the sum of the brightness of each sub-pixel in the display sub-area can be obtained through a brightness acquisition device such as a camera, and it is used as the actual brightness of the display sub-area. The preset display brightness value corresponds to a gamma curve, and the gamma curve is used to characterize the one-to-one correspondence between the display brightness value and the grayscale value. For any sub-pixel, the brightness corresponding to the grayscale value of the binding point on the gamma curve corresponding to the preset display brightness value is used as the target brightness of the sub-pixel, and the sum of the target brightness of each sub-pixel in the display sub-area is used as the target brightness of the display sub-area. For any display sub-area, a first compensation coefficient is generated according to the difference between the actual brightness and the target brightness, and then the first compensation coefficient corresponding to each display sub-area under each binding point grayscale value constitutes a binding point compensation table.

[0142] S122: When the grayscale value of the display sub-area is equal to the grayscale value of any binding point, the correspondence between the grayscale value of the display sub-area and the first compensation coefficient is determined from the first preset compensation table by looking up the table; when the grayscale value of the display sub-area is not equal to the grayscale value of any binding point, the correspondence between the grayscale value of the display sub-area and the first compensation coefficient is determined according to the first preset compensation table and by interpolation.

[0143] Specifically, when the grayscale value of the display sub-area is equal to any one of the binding point grayscale values, the corresponding relationship between the grayscale value of the display sub-area and the first compensation coefficient is equal to the corresponding relationship between the binding point grayscale value and the first compensation coefficient corresponding to the binding point grayscale value in the first preset compensation table. Exemplarily, taking the first display sub-area ① as an example, when the grayscale value of the first display sub-area ① is equal to 8, the first compensation coefficient corresponding to the first display sub-area ① when the binding point grayscale value is 8 is directly obtained from the first preset compensation table by looking up the table, which is 14.

[0144] If the grayscale value of the first display sub-area ① is 20, the first compensation coefficient corresponding to the grayscale value of the first display area ① when the grayscale value is 20 is determined by interpolation through the first compensation coefficient corresponding to the grayscale value of the first display area ① when the grayscale value of the binding point is 16 and the first compensation coefficient corresponding to the grayscale value of the first display area ① when the grayscale value of the binding point is 32, that is, the corresponding relationship between the grayscale value of the first display sub-area ① and the first compensation coefficient is determined. The difference method can be linear interpolation.

[0145] S132: Determine a first compensation coefficient corresponding to the display sub-area according to the grayscale value of the display sub-area and the corresponding relationship between the grayscale value of the display sub-area and the first compensation coefficient.

[0146] According to the average value of the grayscale values ​​of all sub-pixels in the display sub-area under the writing frame of the next driving cycle, the corresponding relationship between the grayscale value of the display sub-area and the first compensation coefficient is determined according to steps S112-S122. After the corresponding relationship is determined, the first compensation coefficient can be determined. Taking the first display sub-area ① as an example, the average value of the grayscale values ​​of each sub-pixel in the first display sub-area ① under the writing frame of the next driving cycle is taken as the grayscale value of the first display sub-area ①. According to steps S112-S122, the corresponding relationship between the grayscale value of the first display sub-area ① and the first compensation coefficient is determined, and then the first compensation coefficient corresponding to the first display sub-area ① is determined. The determination process of the first compensation coefficient corresponding to other display sub-areas is similar to the above, and will not be repeated. Among them, the grayscale value of the display sub-area described in each step represents the grayscale value corresponding to the display sub-area under the writing frame of the next driving cycle. Specifically, the grayscale value of the display sub-area is the average value of the grayscale values ​​of each sub-pixel of the display sub-area under the writing frame of the next driving cycle.

[0147] S142: Calculate a first compensation coefficient corresponding to the display sub-area, a gamma pressure difference value, and the accuracy of the gamma circuit to obtain a first compensation value for the display sub-area.

[0148] For any display sub-area, its first compensation value is equal to the product of the first compensation coefficient corresponding to the display sub-area ① and the gamma step length. Taking the first display sub-area ① as an example, its first compensation value is equal to the product of the first compensation coefficient corresponding to the first display sub-area ① and the gamma step length.

[0149] S152: Obtain a second preset compensation table; the second preset compensation table includes multiple binding point display brightness values, multiple binding point grayscale values ​​and correction coefficients corresponding to the binding point grayscale values ​​under the binding point display brightness values; wherein each display sub-area corresponds to the same second preset compensation table.

[0150] A second preset compensation table is established in advance, and before the display panel to be compensated leaves the factory, the second preset compensation table is stored in the memory. As shown in Table 2, the second preset compensation table, the grayscale conversion amount in the first column is the same as that in Table 1, the grayscale conversion amount divided by 16 represents the grayscale value of the binding point, 0 in the first row represents the display brightness value of 0 corresponding to the maximum grayscale, 1 represents the display brightness value of 1nit corresponding to the maximum grayscale, 204 represents the display brightness value of 5nit corresponding to the maximum grayscale, 342 represents the display brightness value of 10nit corresponding to the maximum grayscale, 660 represents the display brightness value of 30nit corresponding to the maximum grayscale, and 1204 represents the display brightness value of 89.8nit corresponding to the maximum grayscale. The value of any cell except the first row and the first column in the table is divided by 128 to represent the correction coefficient, or the rows of the second preset compensation table can directly represent the brightness values ​​of different binding points, and the columns are the binding point grayscale values ​​such as 0 grayscale, 8 grayscale, 16 grayscale, 32 grayscale, etc. The value of any cell except the first row and the first column is the correction coefficient, which is not specifically limited in this embodiment. Due to the limitation of the bit position of the driving chip, this embodiment exemplarily shows that the values ​​of the cells except the first row and the first column in Table 2 are less than or equal to 1024.

[0151] Table 2 The second preset compensation table

[0152] Grayscale conversion amount 0 1 204 342 660 1204 0 0 0 0 0 0 0 128 0 200 128 140 110 64 256 0 160 160 150 120 50 512 0 250 240 190 120 50

[0153] Further, generating the second preset compensation table includes:

[0154] Selecting h binding point display brightness values ​​from a plurality of display brightness values; h is an integer greater than or equal to 2;

[0155] For any binding point display brightness value of any display sub-area, at any binding point grayscale value, a second compensation coefficient corresponding to the binding point grayscale value at the binding point display brightness value is generated based on the compensated brightness corresponding to the first compensation value and the target brightness corresponding to the binding point grayscale value of the display sub-area at the binding point display brightness value.

[0156] A coarsely adjusted data voltage is generated according to the first compensation value, and the display sub-area is driven to display according to the coarsely adjusted data voltage, thereby obtaining a brightness compensated according to the coarse adjustment value. Further, a second compensation coefficient is generated according to a difference between the compensated brightness corresponding to the first compensation value and the target brightness corresponding to the binding point grayscale value of the display sub-area under the binding point display brightness value, so as to correct the brightness compensated according to the coarse adjustment value to make it closer to the target brightness.

[0157] The second compensation coefficient corresponding to any display sub-area that meets the preset condition is used as the correction coefficient; the preset condition is: the absolute value of the difference between the first brightness of each display sub-area and the target brightness corresponding to the binding point grayscale value of the display sub-area under the binding point display brightness value is less than the absolute value of the difference between the second brightness and the target brightness corresponding to the binding point grayscale value under the binding point display brightness value; the first brightness is the brightness of the display sub-area when it is lit under the data voltage generated by the first compensation value; the second brightness is the brightness of the display sub-area when it is lit under the data voltage generated after the first compensation value is corrected according to the second compensation coefficient;

[0158] If there is no second compensation coefficient that meets the preset condition under the binding point grayscale value under the display brightness value, the correction coefficient corresponding to the binding point grayscale value under the display brightness value is set to 1.

[0159] Because each display sub-area corresponds to the same correction coefficient at a certain binding point grayscale value under a certain binding point display brightness value, if it is not possible to satisfy that the brightness of each display sub-area lit under the data voltage generated after the first compensation value is corrected according to the correction coefficient is closer to the target brightness, no correction will be performed, so as to avoid that when further correction occurs, the brightness of some display sub-areas is closer to the target brightness, while the display effect of the remaining display sub-areas is not further improved or is even worse than the display effect compensated by the first compensation value.

[0160] S162: When the grayscale value of the display sub-area is equal to the grayscale value of any binding point and the display brightness value of the display sub-area is equal to the display brightness value of any binding point, the correspondence between the grayscale value and the correction coefficient under the display brightness value of the display sub-area is determined from the second preset compensation table by looking up the table; when the grayscale value of the display sub-area is not equal to the grayscale value of any binding point and / or the display brightness value of the display sub-area is not equal to the display brightness value of any binding point, the correspondence between the grayscale value and the correction coefficient under the display brightness value of the display sub-area is determined by interpolation according to the second preset compensation table.

[0161] Specifically, when the grayscale value of the display sub-area is equal to one of the multiple binding point grayscale values ​​in the second preset compensation table and the display brightness value of the display sub-area is equal to one of the multiple binding point display brightness values, the corresponding relationship between the grayscale value of the display sub-area at the display brightness value and the correction coefficient is equal to the corresponding relationship between the binding point grayscale value at the binding point display brightness value and the correction coefficient corresponding to the binding point grayscale value at the binding point display brightness value in the second preset compensation table. Exemplarily, taking the first display sub-area ① as an example, when the grayscale value of the first display sub-area ① is equal to 8 and the conversion amount corresponding to the display brightness value is 204, the correction coefficient of the first display sub-area ① is directly obtained from the second preset compensation table by looking up the table as 128 / 128=1.

[0162] If the grayscale value of the display sub-area is equal to one of the multiple binding point grayscale values ​​in the second preset compensation table, and the display brightness value of the display sub-area is not equal to the display brightness value of any binding point, or the display brightness value of the display sub-area is equal to one of the multiple binding point display brightness values ​​in the second preset compensation table, and the grayscale value of the display sub-area is not equal to the grayscale value of any binding point, or the display brightness value of the display sub-area is not equal to the display brightness value of any binding point and the grayscale value of the display sub-area is not equal to the grayscale value of any binding point, then the corresponding relationship between the grayscale value of the display sub-area at the display brightness value and the correction coefficient is determined by interpolation according to the second preset compensation table.

[0163] S172: Determine the correction coefficient corresponding to the display sub-area according to the display brightness value and the grayscale value of the display sub-area, and the corresponding relationship between the grayscale value under the display brightness value of the display sub-area and the correction coefficient.

[0164] A plurality of sets of correspondences between different grayscale values ​​and correction coefficients under different display brightness values ​​are established in advance, that is, a second preset compensation table is established in advance, and the correspondences between the grayscale values ​​and the correction coefficients under the display brightness values ​​of the display sub-area are determined by table lookup or interpolation, and then the correction coefficient corresponding to the display sub-area is determined.

[0165] S182: Correct the first compensation value of the display sub-area according to the correction coefficient of the display sub-area.

[0166] The product of the correction coefficient corresponding to the display sub-area and the first compensation value is used as the final compensation value. For any sub-pixel in any display sub-area, a final compensated data voltage is generated according to the initial data voltage of the sub-pixel and the final compensation value, and the light-emitting device of the sub-pixel is driven to display according to the final compensated data voltage. Each sub-pixel in each display sub-area is driven in a similar manner to complete the brightness compensation of the second display area 2.

[0167] In this embodiment, the second display area is divided into multiple display sub-areas, and different display sub-areas correspond to different first compensation values. Compared with the entire second display area corresponding to the same first compensation value, the compensation for the second display area can be more precise and the accuracy of brightness compensation can be improved.

[0168] Optionally, before performing brightness compensation on the actual panel, first obtain the display brightness value of the second display area; when the display brightness value is less than the display brightness threshold, determine the first compensation value of the second display area according to the grayscale value of the second display area; wherein the preset display brightness value is less than or equal to the display brightness threshold. Under low light conditions, the brightness anomaly of the second display area is more obvious, and therefore, subsequent brightness compensation of the display panel can be performed only when the display brightness value is less than the display brightness threshold. The display brightness threshold is the maximum value for brightness compensation of the second display area. Exemplarily, the brightness corresponding to the maximum grayscale under the display brightness threshold may be 10nit. The brightness corresponding to the maximum grayscale under the preset display brightness value may be 2nit. Because the brightness anomaly of the second display area is more obvious under low light conditions, establishing a first preset compensation table with a smaller preset display brightness value will make the first compensation value more accurate, so that the brightness when the sub-pixel is driven with the first compensation value is closer to the target brightness.

[0169] Optionally, the display panel includes a gate driving circuit, the gate driving circuit is connected to a clock signal and a frequency cutting signal; the gate driving circuit is used to output a scanning signal of a first frequency to at least the first display area and a scanning signal of a second frequency to the second display area according to the frequency cutting signal;

[0170] A driving cycle of the second display area includes a holding frame and a refresh frame. In the refresh frame, the control clock signal is a pulse signal; in the holding frame, the control clock signal is an invalid potential; the invalid potential is the potential for turning off the transistor connected to the clock signal in the control gate drive circuit; wherein the invalid potential is a DC potential.

[0171] Specifically, the gate drive circuit may include a multi-stage shift register arranged in cascade, each stage of the shift register corresponding to at least one row of sub-pixels, and each stage of the shift register is connected to a frequency cutting signal, and the frequency cutting signal is used to control whether the shift register can shift the input signal connected as a scan signal. Therefore, by controlling the potential change of the frequency cutting signal, it is possible to output a scan signal of a first frequency to the first display area and output a scan signal of a second frequency to the second display area. The scan signal is a signal that controls the data writing transistor to be turned on or off. Exemplarily, the first display area is refreshed at 120HZ and the second display area is refreshed at 1HZ, then a driving cycle can be considered as one second, and within one second, the first display area is refreshed 120 times, and the second display area is refreshed only once. Within one second, the display panel includes 120 frames, corresponding to the first display area, all of which are refresh frames, and each frame writes data voltage, while the second display area includes only 1 refresh frame and 119 hold frames in 120 frames, and the data voltage is written in the refresh frame, and the hold frame, and the scan signal controls the data writing transistor to be turned off. In order to reduce the power consumption of the display panel, in the low refresh area, that is, the holding frame of the second display area, the clock signal is controlled to be an invalid potential to avoid energy waste caused by the clock signal always switching between high and low potentials. Figure 6 A schematic diagram of a display panel according to an embodiment of the present invention is provided. Figure 6 , a plurality of sub-pixels 30 are arrayed in the display area AA of the display panel, and the gate driving circuit 100 is disposed in the non-display area NAA. The scanning line LS extends along the row direction of the display panel 4. The display panel 4 is also provided with a data line LD extending along the column direction of the display panel 4, for providing a data voltage Vdata to each sub-pixel 30.

[0172] The gate drive circuit 100 includes: a plurality of shift registers 40 and a plurality of gating units 20; the gating unit 20 is connected to the corresponding shift register 40 and the scan line LS, and the gating unit 20 is connected to the frequency cutting signal C3. The plurality of shift registers 40 can be connected in cascade. The frequency cutting signal C3 is a global signal, and each gating unit 20 in the same gate drive circuit 100 is connected to the same frequency cutting signal C3. The gating unit 20 is used to control whether the gating unit 20 copies and outputs the conduction pulse of the output signal GOUT of the shift register 40 according to the frequency cutting signal C3, thereby controlling the pulse frequency of the scan signal SCAN transmitted to the scan line LS. For the convenience of description below, the driving process of the gate drive circuit 100 in the partition multi-frequency display process is described by taking the example that each level of the gating unit 20 is connected to a scan line LS, and the nth scan line LS is connected to the nth row of sub-pixels 30. Taking the three-zone frequency display of the display panel 1 as an example, the third display area 3 of the display panel includes, for example, the 1st to kth rows of sub-pixels 30, the first display area 1 includes, for example, the k+1th to mth rows of sub-pixels 30, and the second display area 2 includes, for example, the m+1th to ith rows of sub-pixels 30, and taking the first frequency as 120HZ and the second frequency as 1HZ as an example. Specifically, the frequency switching signal C3 can be set to maintain the gate potential in the display frame F1, so that the sub-pixels 30 in each display area are all refreshed in the display frame, which is equivalent to the display frame F1 being the refresh frame of the first display area 1, the second display area 2 and the third display area 3, and the output signal GOUT of each stage of the shift register 40 is a valid potential pulse configured as a conduction pulse of the scanning signal SCAN connected to the i-row sub-pixels 30. In the subsequent n-1 display frames, the frequency cutting signal C3 is controlled to be a blocking potential corresponding to the second display area 2 and the third display area 3, and a gating potential corresponding to the first display area 1, so that each sub-pixel 30 in the first display area 1 can perform data refresh in the display frames F2 to Fn, and each sub-pixel 30 in the second display area 2 and the third display area 3 can not perform data refresh in the second display frame to the nth display frame. n is 120.

[0173] Figure 7 A timing diagram of a clock signal provided in an embodiment of the present invention, wherein the clock signal includes a first clock signal CLK1 and a second clock signal CLK2, Figure 6 and Figure 7 , Figure 7 Taking the timing of the first clock signal CLK1 as an example, in the first display frame F1, both clock signals are pulse signals. In the subsequent n-1 display frames, such as display frame F2 to display frame Fn, only display frame F2 is shown in the figure, and both clock signals are controlled to be DC potentials corresponding to the second display area 2 and the third display area 3, and to be pulse signals corresponding to the first display area 1.

[0174] After maintaining the frame and controlling the clock signal to an invalid potential to reduce the power consumption of the display panel, the data writing transistors in the first display area and the second display area are turned on and off for different times within the same time, causing the second display area to appear darker or brighter. Therefore, the brightness compensation method of the following panel in any of the above embodiments is used to compensate for the brightness of the second display area.

[0175] Optionally, the display panel includes multiple rows of sub-pixel rows, each row of sub-pixel rows includes multiple sub-pixels, each sub-pixel row is refreshed row by row, the first display area and the second display area are arranged along the column direction of the sub-pixels, and the second display area is refreshed later than the first display area.

[0176] like Figure 5 As shown, each row of sub-pixels in the display panel is refreshed row by row, and the second display area 2 is located below the refresh direction of the first display area 1. Although the third display area 3 is also a low refresh area, the clock signal in the third display area 3 is maintained as a pulse signal in the holding frame to ensure that the output scanning signal is input into the second display area, ensuring high-frequency refresh of the second display area. The data writing transistor is connected to the source of the driving transistor, and the compensation transistor is connected between the gate and drain of the driving transistor. The compensation transistor can be controlled to be turned off in the holding frame to achieve low-frequency display of the third display area 3. Therefore, the third display area 3 will not have display abnormalities, and only the second display area 2 needs to be compensated for brightness.

[0177] Optionally, after the first compensation value is corrected according to the correction coefficient, the method further includes:

[0178] The brightness of each sub-pixel row in the second display area is compensated according to the corrected first compensation value. The second display area includes multiple rows of sub-pixel rows, and each sub-pixel row can be corrected according to the corrected first compensation value. Specifically, each sub-pixel row in the second display area corresponds to the same first compensation value, and then corresponds to the same corrected first compensation value, or each sub-pixel row corresponds to a first compensation value, or the second display area is divided into multiple display sub-areas, and each display sub-area corresponds to a first compensation value, which is not specifically limited. The positions of the first display area and the second display area are bound, and the coordinates of the starting compensation position of the second display area are determined according to the end position coordinates of the first display area. Optionally, the first display area and the second display area are adjacently arranged; brightness compensation is performed on each sub-pixel row in the second display area starting from the L+1th row of sub-pixel rows; wherein the Lth row of sub-pixel rows is the sub-pixel row that is refreshed the latest in the first display area, and L is an integer greater than or equal to 1. Exemplarily, the first display area ends at the Lth row, then brightness compensation is performed on each sub-pixel row starting from the (L+1)th row, so that the compensation area is dynamically adjusted with the local refresh area, and L is an integer greater than or equal to 1.

[0179] Alternatively, the second display area includes n sub-pixel rows, where n is an integer greater than or equal to 2, and after the first compensation value is corrected according to the correction coefficient, the second display area further includes:

[0180] Brightness compensation is performed on sub-pixel rows from the L+mth row to the nth row in the second display area of ​​the display panel according to the corrected first compensation value; wherein the nth row of sub-pixel rows is the sub-pixel row refreshed latest in the second display area, the Lth row of sub-pixel rows is the sub-pixel row refreshed latest in the first display area, m is an integer greater than or equal to 2, L is an integer greater than or equal to 1, and m is less than or equal to n.

[0181] The positions of the first display area and the second display area are bound, and the coordinates of the starting compensation position of the second display area are determined according to the coordinates of the ending position of the first display area. For example, if the first display area ends at the hth row, then the brightness compensation of the sub-pixels in each row of sub-pixel rows is performed starting from the (h+m)th row. If the display area includes the first display area and the second display area, the first display area includes 50 rows of sub-pixels, and the second display area includes 60 rows of sub-pixels, and m=10, then the brightness compensation is performed for the sub-pixels from the 60th row to the 60th row of the second display area, that is, the 110th row of sub-pixels in the entire display area. Because the brightness of the sub-pixels in the 10 rows after the end of the first display area is abnormally small, the brightness compensation can be performed for the sub-pixels in the remaining rows of the second display area except for the first 10 rows of sub-pixels. Alternatively, the first display area and the second display area are connected to different gate drive circuits to achieve refresh at different frequencies. Optionally, the display panel includes at least a first gate driving circuit for outputting a scanning signal of a first frequency to the first display area and a second gate driving circuit for outputting a scanning signal of a second frequency to the second display area, and the first gate driving circuit and the second gate driving circuit are connected to different clock signals; a driving cycle of the second display area includes a holding frame and a refresh frame, and in the refresh frame, the clock signal connected to the second gate driving circuit is controlled to be a pulse signal; in the holding frame, the clock signal connected to the second gate driving circuit is controlled to be an invalid potential; the invalid potential is the potential at which the transistor connected to the clock signal in the control gate driving circuit is turned off, and the invalid potential is a DC potential. The clock signal of the second gate driving circuit is controlled to maintain an invalid potential in the holding frame of the second display area to reduce the power consumption of the display panel, and at the same time, the gate driving circuit has no scanning signal output in the holding frame, and the data writing transistor is in the off state, so that the second display area is refreshed at the second frequency. Because different display areas correspond to different gate driving circuits, the problem of abnormal display may mainly exist in the low refresh area. At this time, for Figure 5 Both the second display area 2 and the third display area 3 can perform brightness compensation.

[0182] Optionally, the display area of ​​the display panel includes at least a first display area and a second display area, and the display panel further includes a gate driving circuit, the gate driving circuit is connected to a clock signal and a frequency cutting signal; the gate driving circuit is used to output a scanning signal of a first frequency to at least the first display area and a scanning signal of a second frequency to the second display area according to the frequency cutting signal; wherein the first frequency is greater than the second frequency;

[0183] The brightness compensation method of the display panel includes:

[0184] According to the display data of the second display area, a display compensation value of the second display area is determined, wherein the display data includes a grayscale value and / or a display brightness value, and the display compensation value includes a grayscale compensation value or a data voltage compensation value.

[0185] After maintaining the frame and controlling the clock signal to an invalid potential to reduce the power consumption of the display panel, the data writing transistors in the first display area and the second display area are turned on and off for different times within the same time, causing the second display area to appear darker or brighter. Therefore, the brightness of the second display area needs to be compensated to solve the abnormal display problem in the second display area, i.e., the low refresh area.

[0186] The embodiment of the present invention further provides a brightness compensation device for a display panel. Figure 8 A schematic diagram of a brightness compensation device for a display panel according to an embodiment of the present invention is provided. Figure 8 , the display area of ​​the display panel includes at least a first display area and a second display area,

[0187] The brightness compensation device of the display panel comprises:

[0188] The first compensation value generating module 10 is used to determine the first compensation value according to the grayscale value of the second display area when refreshing the first display area at the first frequency and refreshing the second display area at the second frequency; wherein the first frequency is greater than the second frequency

[0189] A correction coefficient generating module 11, used to determine the correction coefficient according to the display brightness value and grayscale value of the second display area;

[0190] The brightness correction module 12 is used to correct the first compensation value according to the correction coefficient.

[0191] The beneficial effects of the brightness compensation device of the display panel are the same as the beneficial effects of the brightness compensation method of the display panel, which will not be described in detail here.

[0192] An embodiment of the present invention further provides a display device, Fig. 9 A schematic diagram of a display device according to an embodiment of the present invention is provided. Fig. 9The display device includes the brightness compensation device of the display panel mentioned above, and the display device 13 can be Fig. 9 The mobile phone shown may also be a computer, a television, a smart wearable display device, etc., and the embodiments of the present invention do not specifically limit this.

[0193] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0194] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A brightness compensation method for a display panel, characterized in that: The display area of ​​the display panel includes at least a first display area and a second display area, and the brightness compensation method of the display panel includes: When the first display area is refreshed at a first frequency and the second display area is refreshed at a second frequency: determining a first compensation value of the second display area according to the grayscale value of the second display area; determining a correction coefficient according to a display brightness value and a grayscale value of the second display area; Correcting the first compensation value according to the correction coefficient; The first frequency is greater than the second frequency.

2. The brightness compensation method of a display panel according to claim 1, characterized in that: Determining the first compensation value of the second display area according to the grayscale value of the second display area includes: The first compensation value of the second display area is determined according to the grayscale value of the second display area and the corresponding relationship between the grayscale value of the second display area and the first compensation value.

3. The brightness compensation method of a display panel according to claim 2, characterized in that: The determining of the correction coefficient according to the display brightness value and the grayscale value of the second display area comprises: The correction coefficient corresponding to the second display area is determined according to the display brightness value and the grayscale value of the second display area, and the corresponding relationship between the grayscale value under the display brightness value of the second display area and the correction coefficient.

4. The brightness compensation method of a display panel according to claim 3, characterized in that: The driving chip corresponding to the display panel includes a gamma circuit, and the gamma circuit is used to output a gamma voltage; Determining the first compensation value of the second display area according to the grayscale value of the second display area and the corresponding relationship between the grayscale value of the second display area and the first compensation value includes: Determining a first compensation coefficient corresponding to the second display area according to the grayscale value of the second display area and a corresponding relationship between the grayscale value of the second display area and the first compensation coefficient; The first compensation coefficient, the gamma pressure difference value and the accuracy of the gamma circuit corresponding to the second display area are calculated to obtain the first compensation value of the second display area; the gamma pressure difference value is the difference between the maximum value of the gamma voltage output by the gamma circuit and the minimum value of the gamma voltage.

5. The brightness compensation method of a display panel according to claim 4, characterized in that: The first compensation value of the second display area is the product of the first compensation coefficient and the gamma step length, and the gamma step length is the ratio of the gamma pressure difference value to the accuracy of the gamma circuit; Preferably, correcting the first compensation value according to the correction coefficient includes: The product of the correction coefficient and the first compensation value is used as the corrected compensation value.

6. The brightness compensation method of a display panel according to claim 4, characterized in that: The second display area includes a plurality of display sub-areas, and determining the first compensation value of the second display area according to the grayscale value of the second display area and the corresponding relationship between the grayscale value of the second display area and the first compensation value includes: For any of the display sub-areas in the second display area: Determining a first compensation coefficient corresponding to the display sub-area according to the grayscale value of the display sub-area and a corresponding relationship between the grayscale value of the display sub-area and the first compensation coefficient; Performing calculation on a first compensation coefficient corresponding to the display sub-area, a gamma pressure difference value, and the accuracy of the gamma circuit to obtain a first compensation value of the display sub-area; Determining the correction coefficient according to the display brightness value and the grayscale value of the second display area includes: A correction coefficient is determined according to the display brightness value and the grayscale value of the display sub-area.

7. The brightness compensation method of a display panel according to claim 6, characterized in that: Before determining the first compensation coefficient corresponding to the second display area according to the grayscale value of the second display area and the correspondence between the grayscale value of the second display area and the first compensation coefficient, the method further includes: Acquire a first preset compensation table; the first preset compensation table includes a plurality of binding point grayscale values ​​and a first compensation coefficient corresponding to each of the display sub-areas at each of the binding point grayscale values; For any display subarea: When the grayscale value of the display sub-area is equal to any one of the binding point grayscale values, determining the corresponding relationship between the grayscale value of the display sub-area and the first compensation coefficient from the first preset compensation table by looking up the table; When the grayscale value of the display sub-area is not equal to any of the binding point grayscale values, the corresponding relationship between the grayscale value of the display sub-area and the first compensation coefficient is determined according to the first preset compensation table and by interpolation.

8. The brightness compensation method of a display panel according to claim 6, characterized in that According to the display brightness value and grayscale value of the second display area, and the corresponding relationship between the grayscale value and the correction coefficient under the display brightness value of the second display area, determining the correction coefficient corresponding to the second display area includes: For any display subarea: Determine the correction coefficient corresponding to the display sub-area according to the display brightness value and the grayscale value of the display sub-area, and the corresponding relationship between the grayscale value under the display brightness value of the display sub-area and the correction coefficient; wherein the display brightness values ​​of the display sub-areas are the same; Before determining the correction coefficient corresponding to the display sub-area according to the display brightness value and the grayscale value of the display sub-area, and the corresponding relationship between the grayscale value under the display brightness value of the display sub-area and the correction coefficient, the method further includes: Obtain a second preset compensation table; the second preset compensation table includes a plurality of binding point display brightness values, a plurality of binding point grayscale values, and correction coefficients corresponding to the binding point grayscale values ​​under the binding point display brightness values; wherein each of the display sub-areas corresponds to the same second preset compensation table; When the grayscale value of the display sub-area is equal to any one of the binding point grayscale values ​​and the display brightness value of the display sub-area is equal to any one of the binding point display brightness values, the corresponding relationship between the grayscale value under the display brightness value of the display sub-area and the correction coefficient is determined from the second preset compensation table by looking up the table; When the grayscale value of the display sub-area is not equal to any of the binding point grayscale values ​​and / or the display brightness value of the display sub-area is not equal to any of the binding point display brightness values, the correspondence between the grayscale value under the display brightness value of the display sub-area and the correction coefficient is determined by interpolation according to the second preset compensation table.

9. The brightness compensation method of a display panel according to claim 7, characterized in that: Under different division modes of dividing the display panel into at least a first display area and a second display area, the second display areas corresponding to the different division modes correspond to the same first preset compensation table.

10. The brightness compensation method of a display panel according to claim 7, characterized in that: Under different division modes of dividing the display panel into at least a first display area and a second display area, the second display areas corresponding to the different division modes correspond to different first preset compensation tables; Before determining the first compensation coefficient corresponding to the display sub-area according to the grayscale value of the display sub-area and the corresponding relationship between the grayscale value of the display sub-area and the first compensation coefficient, the method further includes: Establishing multiple test groups, wherein the test groups include a first display area of ​​a binding point and a second display area of ​​a binding point, and positions of the first display area of ​​the binding point and positions of the second display area of ​​the binding point are different in different test groups; Establishing a plurality of refresh frequency groups, wherein the refresh frequency groups include a first binding point frequency and a second binding point frequency; For any test group, a binding point compensation table corresponding to the test group under each refresh frequency group is established; determining the test group to which the first display area and the second display area belong according to positions of the first display area and the second display area in the display panel; The first preset compensation table is determined according to the binding point compensation table corresponding to each refresh frequency group under the test group, the first frequency and the second frequency.

11. The brightness compensation method of a display panel according to claim 10, characterized in that: For any test group, establishing a binding point compensation table corresponding to the test group under any refresh frequency group includes: Select m grayscale values ​​from a plurality of grayscale values ​​as the binding point grayscale values; m is an integer greater than or equal to 2; Refreshing a first display area of ​​a binding point of a test display panel at the first binding point frequency, and refreshing a second display area of ​​a binding point of the test display panel at the second binding point frequency; For any of the binding point grayscale values: Lighting up the second display area of ​​the binding point with the grayscale value of the binding point under the preset display brightness value, and collecting the actual brightness of each of the display sub-areas in the second display area of ​​the binding point; generating a first compensation coefficient for each of the display sub-areas according to the actual brightness of each of the display sub-areas and the target brightness corresponding to the grayscale value of the binding point under the preset display brightness value; The binding point compensation table is generated according to the first compensation coefficients corresponding to the display sub-areas at the binding point grayscale values.

12. The brightness compensation method of a display panel according to claim 8, characterized in that: Generating the second preset compensation table includes: Selecting h binding point display brightness values ​​from a plurality of display brightness values; h is an integer greater than or equal to 2; For any binding point display brightness value of any display sub-area, at any binding point grayscale value, according to the compensated brightness corresponding to the first compensation value and the target brightness corresponding to the binding point grayscale value of the display sub-area at the binding point display brightness value, generate a second compensation coefficient corresponding to the binding point grayscale value at the binding point display brightness value; The second compensation coefficient corresponding to any display sub-area that meets the preset condition is used as the correction coefficient; the preset condition is: the absolute value of the difference between the first brightness of each of the display sub-areas and the target brightness corresponding to the binding point grayscale value under the binding point display brightness value is smaller than the absolute value of the difference between the second brightness and the target brightness corresponding to the binding point grayscale value under the binding point display brightness value; the first brightness is the brightness of the display sub-area when it is lit under the data voltage generated by the first compensation value; the second brightness is the brightness of the display sub-area when it is lit under the data voltage generated after the first compensation value is corrected according to the second compensation coefficient; If there is no second compensation coefficient that meets the preset condition under the binding point grayscale value under the display brightness value, the correction coefficient corresponding to the binding point grayscale value under the display brightness value is set to 1.

13. The brightness compensation method of a display panel according to claim 11, characterized in that: Before determining the first compensation value of the second display area according to the grayscale value of the second display area, the method includes: Acquire a display brightness value of the second display area; When the display brightness value is less than a display brightness threshold, a first compensation value of the second display area is determined according to the grayscale value of the second display area; wherein the preset display brightness value is less than or equal to the display brightness threshold.

14. The brightness compensation method of a display panel according to claim 1, characterized in that: The display panel comprises a gate driving circuit, the gate driving circuit is connected to a clock signal and a frequency cutting signal; the gate driving circuit is used to output a scanning signal of a first frequency to at least the first display area and a scanning signal of a second frequency to the second display area according to the frequency cutting signal; A driving cycle of the second display area includes a holding frame and a refresh frame. In the refresh frame, the clock signal is controlled to be a pulse signal; in the holding frame, the clock signal is controlled to be an invalid potential; the invalid potential is a potential that controls the transistor connected to the clock signal in the gate drive circuit to turn off; wherein, the invalid potential is a DC potential.

15. The brightness compensation method of a display panel according to claim 14, characterized in that: The display panel includes a plurality of sub-pixel rows, each sub-pixel row is refreshed row by row, the first display area and the second display area are arranged along the column direction of the sub-pixels, and the second display area is refreshed later than the first display area.

16. The brightness compensation method of a display panel according to claim 15, characterized in that: After the first compensation value is corrected according to the correction coefficient, the method further includes: Performing brightness compensation on each sub-pixel row in the second display area according to the corrected first compensation value; Preferably, the first display area and the second display area are arranged adjacent to each other; Brightness compensation is performed on each sub-pixel row in the second display area starting from the L+1th sub-pixel row; wherein the Lth sub-pixel row is the sub-pixel row refreshed last in the first display area, and L is an integer greater than or equal to 1.

17. The brightness compensation method of a display panel according to claim 15, characterized in that: The second display area includes n rows of sub-pixel rows, where n is an integer greater than or equal to 2, and after the first compensation value is corrected according to the correction coefficient, further includes: Brightness compensation is performed on sub-pixel rows from the L+mth row to the nth row in the second display area of ​​the display panel according to the corrected first compensation value; wherein the nth row of sub-pixel rows is the sub-pixel row refreshed latest in the second display area, the Lth row of sub-pixel rows is the sub-pixel row refreshed latest in the first display area, m is an integer greater than or equal to 2, L is an integer greater than or equal to 1, and m is less than or equal to n.

18. The brightness compensation method of a display panel according to claim 1, characterized in that: The display panel at least comprises a first gate driving circuit for outputting a scanning signal of a first frequency to the first display area and a second gate driving circuit for outputting a scanning signal of a second frequency to the second display area, and the first gate driving circuit and the second gate driving circuit are connected to different clock signals; A driving cycle of the second display area includes a holding frame and a refresh frame. In the refresh frame, the clock signal controlling the second gate drive circuit to be connected is a pulse signal; in the holding frame, the clock signal controlling the second gate drive circuit to be connected is an invalid potential; the invalid potential is a potential for controlling the transistor in the gate drive circuit to be turned off that is connected to the clock signal; wherein the invalid potential is a DC potential.

19. A brightness compensation method for a display panel, characterized in that: The display area of ​​the display panel at least includes a first display area and a second display area, and the display panel further includes a gate driving circuit, the gate driving circuit is connected to a clock signal and a frequency cutting signal; the gate driving circuit is used to output a scanning signal of a first frequency to at least the first display area and a scanning signal of a second frequency to the second display area according to the frequency cutting signal; wherein the first frequency is greater than the second frequency; The brightness compensation method of the display panel includes: A display compensation value of the second display area is determined according to the display data of the second display area.

20. A brightness compensation device for a display panel, characterized in that: The display area of ​​the display panel at least includes a first display area and a second display area. The brightness compensation device of the display panel comprises: A first compensation value generating module, configured to determine a first compensation value according to a grayscale value of the second display area when the first display area is refreshed at a first frequency and the second display area is refreshed at a second frequency; wherein the first frequency is greater than the second frequency; A correction coefficient generating module, used for determining the correction coefficient according to the display brightness value and grayscale value of the second display area; A brightness correction module is used to correct the first compensation value according to the correction coefficient.

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