Display panel, brightness compensation data determination method and brightness compensation method

Abstract

The invention discloses a display panel, a brightness compensation data determination method and a brightness compensation method, and the method comprises the steps: obtaining a brightness compensation data set corresponding to a first display subarea of a to-be-compensated display panel in a local brush frame, and the brightness compensation data set comprises the brightness compensation data of at least two gears; in the local refreshing frame, the first display subarea does not perform picture refreshing, and the second display subarea performs picture refreshing; acquiring the brightness difference between the first display sub-area and the second display sub-area under the set display picture of the partition multi-frequency display mode after the first display sub-area is compensated by the brightness compensation data of at least one gear; and according to the brightness difference, determining target brightness compensation data corresponding to the local brush frame of the first display subarea of the display panel to be compensated under the set display picture from the brightness compensation data set. According to the invention, the brightness difference between the first display subarea and the second display subarea of the display panel in a partitioned multi-frequency display mode can be improved.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a display panel, a method for determining brightness compensation data, and a brightness compensation method. Background Art

[0002] With the development of display technologies, users' requirements for display quality are also getting higher and higher.

[0003] In the prior art, there is a problem of poor display effect in the case of multi-frequency display in partitions. Summary of the Invention

[0004] The present invention provides a display panel, a method for determining brightness compensation data, and a brightness compensation method, which can improve the brightness difference in the multi-frequency display mode in partitions and enhance the display effect.

[0005] According to one aspect of the present invention, there is provided a method for determining brightness compensation data of a display panel. The display panel to be compensated includes a first display sub-region and a second display sub-region. In the multi-frequency display mode in partitions, the refresh frequency of the first display sub-region is lower than that of the second display sub-region. The method includes:

[0006] Obtaining, in a local refresh frame, a brightness compensation data group corresponding to the first display sub-region of the display panel to be compensated, where the brightness compensation data group includes at least two levels of brightness compensation data; wherein, in the local refresh frame, the first display sub-region does not perform screen refreshing, and the second display sub-region performs screen refreshing;

[0007] Obtaining the brightness difference between the first display sub-region and the second display sub-region in a set display screen in the multi-frequency display mode in partitions after the first display sub-region is compensated with at least one level of brightness compensation data;

[0008] Determining, according to the brightness difference, the target brightness compensation data corresponding to the first display sub-region of the display panel to be compensated in the local refresh frame in the set display screen from the brightness compensation data group.

[0009] Optionally, obtaining, in a local refresh frame, a brightness compensation data group corresponding to the first display sub-region of the display panel to be compensated, where the brightness compensation data group includes at least two levels of brightness compensation data, includes:

[0010] Respectively obtaining the brightness compensation data of corresponding levels of a third display sub-region of multiple sample display panels in at least one set display screen in the multi-frequency display mode in partitions, and forming a brightness compensation data group with at least two levels of brightness compensation data; wherein, the sample display panel includes a third display sub-region and a fourth display sub-region, and in the local refresh frame, the third display sub-region does not perform screen refreshing, and the fourth display sub-region performs screen refreshing;

[0011] Optionally, the brightness compensation data is configured such that the brightness difference between the third display sub-region and the fourth display sub-region of at least one sample display panel is less than a preset value;

[0012] Optionally, the position of the third display sub-region corresponds to that of the first display sub-region, and the position of the fourth display sub-region corresponds to that of the second display sub-region;

[0013] Optionally, the refresh frequency of the third display sub-region is the same as that of the first display sub-region, and the refresh frequency of the fourth display sub-region is the same as that of the second display sub-region;

[0014] Optionally, the set display screen includes at least two;

[0015] Optionally, the partition refresh frequencies corresponding to at least two set display screens are different; the different partition refresh frequencies include that the refresh frequencies corresponding to the third display sub-region are different, and / or the refresh frequencies corresponding to the fourth display sub-region are different;

[0016] Optionally, in the partition multi-frequency display mode, when the refresh frequencies corresponding to the third display sub-region are different, and / or the refresh frequencies corresponding to the fourth display sub-region are different, the brightness compensation data groups are different;

[0017] Optionally, for at least two sample display panels in the same set display screen with the same partition refresh frequency, the brightness compensation data corresponding to the third display sub-region is the same; wherein, the same partition refresh frequency includes that the refresh frequency of the third display sub-region is the same, and the refresh frequency of the fourth display sub-region is the same;

[0018] Optionally, for at least two sample display panels in the same set display screen with the same partition refresh frequency, the brightness compensation data corresponding to the third display sub-region is different;

[0019] Optionally, the set display screen is the display screen under a set display brightness level and a set display gray scale;

[0020] Optionally, for the to-be-compensated display panel, the brightness compensation data groups corresponding to the set display screens with different set display brightness levels and / or different set display gray scales are different;

[0021] Optionally, for the same brightness level and display gray scale of the set display screen where the refresh frequency corresponding to the first display sub-region is different and / or the refresh frequency corresponding to the second display sub-region is different, the corresponding brightness compensation data groups are different;

[0022] Optionally, for the set display screens with different brightness levels and / or different display gray scales where the refresh frequency corresponding to the first display sub-region is the same and the refresh frequency corresponding to the second display sub-region is the same, the corresponding brightness compensation data groups are different.

[0023] Optionally, after obtaining the brightness compensation data of the first display sub-region after being compensated by at least one gear, the brightness difference between the first display sub-region and the second display sub-region in the set display screen of the partition multi-frequency display mode includes: using the brightness compensation data in the brightness compensation data group corresponding to the same partition refresh frequency, the same display brightness level, and the same display gray scale as the set display screen of the display panel to be compensated, to perform brightness compensation on the first display sub-region of the display panel to be compensated.

[0024] Optionally, according to the brightness difference, determining the target brightness compensation data corresponding to the local refresh frame of the first display sub-region of the display panel to be compensated in the set display screen from the brightness compensation data group, including

[0025] Determining the brightness compensation data in the brightness compensation data group with a brightness difference less than the preset brightness threshold as the target brightness compensation data;

[0026] Or, determining the brightness compensation data with the smallest corresponding brightness difference in the brightness compensation data group as the target brightness compensation data.

[0027] Optionally, before obtaining the brightness difference between the first display sub-region and the second display sub-region in the set display screen of the partition multi-frequency display mode after the first display sub-region is compensated by at least one gear of brightness compensation data, it further includes:

[0028] Determining preliminary compensation data according to the brightness data of the display panel to be compensated in the display screen of the non-partition multi-frequency display mode; wherein, in the display screen of the non-partition multi-frequency display mode, the refresh frequencies of the first display sub-region and the second display sub-region are the same; the preliminary compensation data is used to compensate for the uneven brightness in the display screen of the non-partition multi-frequency display mode.

[0029] Optionally, after obtaining the brightness difference between the first display sub-region and the second display sub-region in the set display screen of the partition multi-frequency display mode after the first display sub-region is compensated by at least one gear of brightness compensation data, it includes:

[0030] On the same machine where the preliminary compensation data is determined, obtaining the brightness of the first display sub-region and the second display sub-region in the set display screen of the partition multi-frequency display mode after the first display sub-region is compensated by at least one gear of brightness compensation data;

[0031] Obtaining the brightness difference according to the brightness of the first display sub-region and the second display sub-region;

[0032] Optionally, after determining the target brightness compensation data corresponding to the local refresh frame of the first display sub-region of the display panel to be compensated in the set display screen from the brightness compensation data group according to the brightness difference, it further includes: storing the target brightness compensation data on the same machine where the preliminary compensation data is determined.

[0033] Optionally, the display panel includes a plurality of pixel circuits. Each pixel circuit includes a data writing module, a driving module, and a compensation module. The data writing module is respectively connected to a data line and the first end of the driving module. The compensation module is connected between the second end and the control end of the driving module.

[0034] The control end of the data writing module is connected to a first scan line. The control end of the compensation module is connected to a second scan line. The data writing module is configured to transmit a corresponding data voltage to the first end of the driving module according to a first scan signal on the first scan line during the data writing phases of the local refresh frame and the full refresh frame. The compensation module is configured to turn off during the local refresh frame and turn on during the full refresh frame according to a second scan signal on the second scan line.

[0035] Optionally, the brightness compensation data includes first compensation data for the data voltage. In the first display sub-region, the data writing module is configured to transmit the data voltage compensated by the brightness compensation data to the first end of the driving module during the data writing phase of the local refresh frame.

[0036] Preferably, in the second display sub-region, the data writing module is configured to transmit the data voltage compensated by the preliminary compensation data to the first end of the driving module during the data writing phase of the local refresh frame.

[0037] Preferably, in the first display sub-region and the second display sub-region, the data writing module is configured to transmit the data voltage compensated by the preliminary compensation data to the first end of the driving module during the data writing phase of the full refresh frame.

[0038] Optionally, the display panel includes a plurality of pixel circuits. Each pixel circuit includes a first initialization module and a driving module. The first initialization module is respectively connected to a first initialization signal line and the first end or the second end of the driving module. The control end of the first initialization module is connected to a third scan line. The first initialization module is configured to transmit a first initialization voltage on the first initialization signal line to the first end or the second end of the driving module according to a third scan signal on the third scan line during the first initialization phases of the local refresh frame and the full refresh frame.

[0039] Optionally, the brightness compensation data includes second compensation data for the first initialization voltage. In the first display sub-region, the first initialization module is configured to transmit the first initialization voltage compensated by the second compensation data to the first end or the second end of the driving module during the first initialization phase of the local refresh frame.

[0040] Optionally, the pixel circuit further includes a second initialization module. The second initialization module is connected to the second end of the driving module and the second initialization signal line, and the control end of the second initialization module is connected to the fourth scanning line. The second initialization module is configured to transmit the second initialization voltage on the second initialization signal line to the second end of the driving module according to the fourth scanning signal on the fourth scanning line during the second initialization stage of the local refresh frame and the full refresh frame.

[0041] Optionally, the brightness compensation data includes third compensation data for the second initialization voltage. In the first display sub-region, the second initialization module is configured to transmit the second initialization voltage compensated by the third compensation data to the second end of the driving module during the second initialization stage of the local refresh frame.

[0042] According to another aspect of the present invention, there is provided a method for compensating the brightness of a display panel, including:

[0043] In the mode of partition multi-frequency display of the display panel, determining the final compensation data corresponding to the first display sub-region from the target brightness compensation data at least according to the refresh frequencies of the first display sub-region and the second display sub-region in the display panel; wherein, the target brightness compensation data is determined by using the brightness compensation data determination method described in any embodiment of the present invention;

[0044] During the local refresh frame, compensating the brightness of the first display sub-region by using the final compensation data.

[0045] According to another aspect of the present invention, there is provided a display panel, which performs brightness compensation by using the brightness compensation method of the display panel described in any embodiment of the present invention.

[0046] The method for determining the brightness compensation data of the display panel according to the embodiment of the present invention includes: obtaining a group of brightness compensation data corresponding to the first display sub-region of the display panel to be compensated during the local refresh frame; wherein, during the local refresh frame, the first display sub-region does not perform screen refreshing, and the second display sub-region performs screen refreshing; according to the brightness difference between the first display sub-region and the second display sub-region under the set display screen of the local refresh frame after the first display sub-region is compensated by at least one gear of brightness compensation data; determining the target brightness compensation data corresponding to the first display sub-region of the display panel to be compensated under the set display screen from the group of brightness compensation data. By pre-obtaining the group of brightness compensation data and determining the target brightness compensation data of the first display sub-region of different display panels to be compensated in the group of brightness compensation data, the present invention can perform chip adjustment on the display panel to obtain the brightness compensation data corresponding to the display panel, improve the brightness difference between the first display sub-region and the second display sub-region of the display panel to be compensated, and avoid the problem that some display panels cannot be well compensated and the display effect still cannot be effectively improved when the same group of compensation data is applied to different display panels.

[0047] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0049] Figure 1 is a schematic structural diagram of a display panel.

[0050] Figure 2 is a flowchart of a method for determining brightness compensation data of a display panel provided by an embodiment of the present invention.

[0051] Figure 3 is a flowchart of another method for determining brightness compensation data of a display panel provided by an embodiment of the present invention.

[0052] Figure 4 is a flowchart of another method for determining brightness compensation data of a display panel provided by an embodiment of the present invention.

[0053] Figure 5 is a flowchart of another method for determining brightness compensation data of a display panel provided by an embodiment of the present invention.

[0054] Figure 6 is a flowchart of another method for determining brightness compensation data of a display panel provided by an embodiment of the present invention.

[0055] Figure 7 is a flowchart of another method for determining brightness compensation data of a display panel provided by an embodiment of the present invention.

[0056] Figure 8 is a schematic diagram of a pixel circuit provided by an embodiment of the present invention.

[0057] Figure 9 is a timing diagram of a pixel circuit.

[0058] Figure 10 is a display panel and a corresponding driving timing diagram of the display panel.

[0059] Figure 11 is a timing diagram of a pixel circuit provided by an embodiment of the present invention.

[0060] Figure 12It is another timing diagram of the pixel circuit provided by the embodiment of the present invention.

[0061] Figure 13 It is a flowchart of a brightness compensation method for a display panel provided by the embodiment of the present invention. Detailed implementation manners

[0062] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0063] It should be noted that the terms "first", "second", etc. in the present invention are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily need to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0064] For the convenience of understanding the embodiments of the present application, the problems existing in the related art will be specifically described first in the present application:

[0065] With the development of the organic light-emitting diode (OLED) display panel industry, the materials of the pixel display circuit have changed from low-temperature polycrystalline silicon (LTPS) to low-temperature polycrystalline oxide (LTPO), and LTPO has been optimized from 1.0 to 2.0. Currently, the requirements for the functions of OLED display panels by terminals are becoming more and more stringent, and LTPO is also transitioning from 2.0 to 3.0. LTPO3.0 mainly refers to local refresh display, that is, the frame frequency of some display pixel circuits is controlled by the gate drive circuit (GIP circuit) to achieve real-time control of different refresh rates in some areas inside the OLED display panel. Figure 1 It is a schematic structural diagram of a display panel, refer to Figure 1, the display panel 10 may include a first display sub-region 11 and a second display sub-region 12, and the refresh frequencies of the first display sub-region 11 and the second display sub-region 12 are different.

[0066] During the development of local refresh display, there are many newly emerging display defects that need to be tackled urgently. Since the refresh frequencies of the first display sub-region 11 and the second display sub-region 12 are different, and the ratio of the refresh time to the hold time is different, it will cause the brightness difference between the first display sub-region 11 and the second display sub-region 12, affecting the display effect of the display panel.

[0067] Therefore, the embodiments of the present invention provide a method for determining brightness compensation data of a display panel, in combination with Figure 1 , the display panel includes at least two display sub-regions. Among them, in the partitioned multi-frequency display mode, at least two display sub-regions in the display panel perform screen refreshing at different refresh frequencies. In the non-partitioned multi-frequency display mode, each display sub-region in the display panel performs screen refreshing at the same refresh frequency. As Figure 1 shown, the display panel to be compensated includes a first display sub-region 11 and a second display sub-region 12. In the partitioned multi-frequency display mode, the refresh frequency of the first display sub-region 11 is lower than that of the second display sub-region 12.

[0068] Figure 2 is a flowchart of a method for determining brightness compensation data of a display panel provided by an embodiment of the present invention. Refer to Figure 2 , the method for determining brightness compensation data of the display panel includes:

[0069] S110. Obtain, in the local refresh frame, the brightness compensation data group corresponding to the first display sub-region of the display panel to be compensated, where the brightness compensation data group includes at least two levels of brightness compensation data.

[0070] Among them, in the local refresh frame, the first display sub-region does not perform screen refreshing, and the second display sub-region performs screen refreshing. That is, in the local refresh frame, the pixel circuit in the first display sub-region does not write a data voltage to the gate of the driving transistor; the pixel circuit in the second display sub-region writes a data voltage to the gate of the driving transistor. In the full refresh frame, both the first display sub-region and the second display sub-region perform screen refreshing. That is, in the full refresh frame, the pixel circuits in both the first display sub-region and the second display sub-region write a data voltage to the gate of the driving transistor.

[0071] Among them, the local refresh frame is a local refresh frame of the display panel to be compensated, and only a partial area of the display panel to be compensated is refreshed. In one frame of the screen, only the picture of the partial area is updated, and the remaining area maintains the original display state. Refer to Figure 1 , Figure 1The display panel 10 therein can be a display panel to be compensated. The display panel to be compensated can be an OLED display panel. The display panel to be compensated includes a first display sub-region 11 and a second display sub-region 12. Among them, the number of the first display sub-region 11 and the second display sub-region 12 is at least one. Figure 1 It is exemplarily shown that the display panel to be compensated includes two first display sub-regions 11, and the two first display sub-regions 11 are located on both sides of the second display sub-region 12; the refresh frequency of the first display sub-region 11 is lower than that of the second display sub-region 12. The first display sub-region 11 is a low-refresh region, also called a cold region; the second display sub-region is a high-refresh region, also called a hot region; in the local refresh frame, the first display sub-region 11 does not perform picture refreshing, and the second display sub-region 12 performs picture refreshing.

[0072] Specifically, the brightness compensation data group corresponding to the first display sub-region of the display panel to be compensated can be obtained by collecting data in the laboratory and in the early stage of the production line. For example, by testing multiple sample display panels, brightness compensation data that can compensate the brightness of the sample display panel by at least two levels can be obtained to form a brightness compensation data group. Among them, the brightness compensation data of each level can compensate the brightness of at least one sample display panel. The brightness compensation data can be the compensation data of the driving data provided to the pixel circuit in the local refresh frame. Exemplarily, the brightness compensation data group includes the brightness compensation data of the first level, the brightness compensation data of the second level up to the brightness compensation data of the Nth level, N≥2, and N is a positive integer; among the brightness compensation data of N levels, the higher the level, the longer the debugging time, but the adjustment will be more accurate and the display brightness will be more uniform.

[0073] S120. After obtaining the first display sub-region compensated by the brightness compensation data of at least one level, obtain the brightness difference between the first display sub-region and the second display sub-region in the set display picture of the partition multi-frequency display mode.

[0074] Among them, the set display screen can be a display screen with a fixed refresh frequency, a fixed display brightness level, and a fixed display gray scale; the first display sub-region of the display panel to be compensated is compensated with at least one gear of brightness compensation data, and each gear of brightness compensation data compensates the same set display screen. The same set display screen is a display screen with the same refresh frequency, the same display brightness level, and the same display gray scale; after each gear of brightness compensation data compensates the first display sub-region of the display panel to be compensated, a brightness difference between the first display sub-region and the second display sub-region of the display panel to be compensated will be obtained. Exemplarily, by taking a picture of the compensated partition-refreshed display panel, the brightness difference of the display panel to be compensated corresponding to each gear of brightness compensation data can be obtained. Considering the differences in load (loading) and brightness non-uniformity (Mura) between different display panels, the brightness differences between different display panels can be comprehensively covered; by taking pictures of the partition-refreshed display panels written with different gears of brightness compensation data, the compensation effects corresponding to different gears of brightness compensation data can be accurately calculated, and the optimal result under all brightness compensation data can be judged.

[0075] S130. According to the brightness difference, determine the target brightness compensation data of the first display sub-region of the display panel to be compensated in the local refresh frame under the set display screen from the brightness compensation data group.

[0076] Among them, each gear of brightness compensation data in the brightness compensation data group can be used to compensate the display panel to be compensated, and the minimum value of the brightness difference between the first display sub-region and the second display sub-region in the obtained display panel to be compensated is obtained. The minimum value meets the brightness difference requirement of the display panel, and the brightness compensation data corresponding to the gear of the minimum value is the target brightness compensation data; or, a preset brightness threshold is set. First, the display panel to be compensated is compensated with the brightness compensation data of the first gear. If the brightness difference is greater than the preset brightness threshold, the brightness compensation data of the next gear is required for compensation. When the brightness difference is less than the preset brightness threshold, the brightness compensation data corresponding to the gear where the brightness difference is less than the preset brightness threshold is the target brightness compensation data. By presetting the brightness compensation data group and determining the target brightness compensation data of the first display sub-region of different display panels to be compensated in the brightness compensation data group, the brightness difference between different display panels can be improved.

[0077] The method for determining the brightness compensation data of the display panel provided by the technical solution of the embodiment of the present invention includes: obtaining the brightness compensation data group corresponding to the first display sub-region of the display panel to be compensated in the local refresh frame; wherein, in the local refresh frame, the first display sub-region does not perform screen refreshing, and the second display sub-region performs screen refreshing; according to the brightness difference between the first display sub-region and the second display sub-region under the set display screen in the local refresh frame after the first display sub-region is compensated by the brightness compensation data of at least one gear; determining the target brightness compensation data corresponding to the first display sub-region of the display panel to be compensated under the set display screen from the brightness compensation data group. By pre-obtaining the brightness compensation data group and determining the target brightness compensation data of the first display sub-region of different display panels to be compensated in the brightness compensation data group, the present invention can obtain the brightness compensation data corresponding to the display panel through panel adjustment, improve the brightness difference between the first display sub-region and the second display sub-region of the display panel to be compensated, and avoid the problem that some display panels cannot be well compensated and the display effect cannot be effectively improved when the same set of compensation data is applied to different display panels.

[0078] Optionally, S110 can be refined. Specifically, S110 is refined to include: S111, respectively obtaining the brightness compensation data of the corresponding gear of the third display sub-region of multiple sample display panels under the set display screen in the local refresh frame, and forming a brightness compensation data group with the brightness compensation data of at least two gears; wherein, in the local refresh frame, the sample display panel includes a third display sub-region and a fourth display sub-region, the third display sub-region does not perform screen refreshing, and the fourth display sub-region performs screen refreshing.

[0079] On the basis of the above embodiment, the embodiment of the present invention also provides a method for determining the brightness compensation data of a display panel. Figure 3 It is a flowchart of another method for determining the brightness compensation data of a display panel provided by the embodiment of the present invention. Refer to Figure 3 , the method for determining the brightness compensation data of the display panel includes:

[0080] S111, respectively obtaining the brightness compensation data of the corresponding gear of the third display sub-region of multiple sample display panels under at least one set display screen in the partition multi-frequency display mode, and forming a brightness compensation data group with the brightness compensation data of at least two gears; wherein the sample display panel includes a third display sub-region and a fourth display sub-region, and in the local refresh frame, the third display sub-region does not perform screen refreshing, and the fourth display sub-region performs screen refreshing.

[0081] Among them, multiple sample display panels are set with the same set display screen, and the same set display screen is a display screen with the same partition refresh frequency, the same display brightness level, and the same display gray scale; corresponding to the third display sub-region, at least two levels of brightness compensation data corresponding to the third display sub-region can be obtained by pre-compensating the third display sub-regions of multiple sample display panels; the third display sub-region of the sample display panel corresponds to the first display sub-region of the display panel to be compensated, and the fourth display sub-region of the sample display panel corresponds to the second display sub-region of the display panel to be compensated. The brightness compensation data group formed by at least two levels of brightness compensation data can be subsequently applied to the first display sub-region of the display panel to be compensated.

[0082] Exemplarily, the brightness compensation data in the brightness compensation data group can improve the brightness difference between the third display sub-region and the fourth display sub-region of all sample display panels; the brightness compensation data group includes the brightness compensation data of the first level, the brightness compensation data of the second level up to the brightness compensation data of the Nth level. The brightness compensation data of the first level can make the brightness difference of some sample display panels among multiple sample display panels meet the requirements. The remaining sample display panels that do not meet the brightness difference requirements need to be compensated by the brightness compensation data of the second level until the brightness differences of all sample display panels meet the requirements. The obtained N levels of brightness compensation data are the brightness compensation data group; the brightness compensation data of each level can improve the brightness difference of some sample display panels. Among the N levels of brightness compensation data, the higher the level, the longer the debugging time, but the adjustment will be more precise and the display brightness will be more uniform.

[0083] S120. Obtain the brightness difference between the first display sub-region and the second display sub-region under the set display screen in the partition multi-frequency display mode after the first display sub-region is compensated by at least one level of brightness compensation data.

[0084] S130. Determine the target brightness compensation data of the first display sub-region of the display panel to be compensated corresponding to the local refresh frame under the set display screen from the brightness compensation data group according to the brightness difference.

[0085] Optionally, the brightness compensation data is configured to make the brightness difference between the third display sub-region and the fourth display sub-region of at least one sample display panel less than a preset value.

[0086] Among them, the preset value can be 1.5%. The brightness difference between the third display sub-region and the fourth display sub-region is the ratio of the third display sub-region to the fourth display sub-region. When the ratio is less than the preset value, the brightness compensation data is such that the brightness difference of at least one sample display panel meets the display requirements of the display panel.

[0087] Optionally, the position of the third display sub-region corresponds to the position of the first display sub-region, and the position of the fourth display sub-region corresponds to the position of the second display sub-region.

[0088] Among them, the position of the third display sub-region corresponds to that of the first display sub-region, and the position of the fourth display sub-region corresponds to that of the second display sub-region, which can make both the third display sub-region and the first display sub-region be low-refresh regions, and the fourth display sub-region and the second display sub-region be high-refresh regions. Setting the display sub-regions of the sample display panel to correspond to the display sub-regions of the display panel to be compensated can make the brightness compensation data group obtained through the sample display panel be applied to the display panel to be compensated, with more accurate brightness compensation and better compensation effect.

[0089] Optionally, the refresh frequencies of the third display sub-region and the first display sub-region are the same, and the refresh frequencies of the fourth display sub-region and the second display sub-region are the same.

[0090] Among them, the refresh frequencies of the third display sub-region and the first display sub-region are the same, and the refresh frequencies of the fourth display sub-region and the second display sub-region are the same, which can make the refresh frequency in the preset display screen in the brightness compensation data group corresponding to the third display sub-region obtained through the sample display panel be the same as the refresh frequency of the display panel to be compensated. Controlling the same variable of the screen refresh frequency can make the compensation effect better when the obtained brightness compensation data group is applied to the display panel to be compensated.

[0091] Optionally, the set display screens include at least two.

[0092] Among them, the set display screens include at least two, and the brightness compensation data corresponds to at least two, which can achieve a better compensation effect.

[0093] Preferably, the partition refresh frequencies corresponding to at least two set display screens are different; the different partition refresh frequencies include that the refresh frequency corresponding to the third display sub-region is different, and / or the refresh frequency corresponding to the fourth display sub-region is different.

[0094] Among them, the partition refresh frequencies corresponding to at least two set display screens are different, and the brightness compensation data groups corresponding to different partition refresh frequencies are different; the different partition refresh frequencies include that the refresh frequency corresponding to the third display sub-region is different, or the refresh frequency corresponding to the fourth display sub-region is different, or the refresh frequency corresponding to the third display sub-region is different and the refresh frequency corresponding to the fourth display sub-region is different. The above three situations correspond to different brightness compensation data groups, and the obtained multiple brightness compensation data groups can make the compensation effect of the display screen of the display panel to be compensated better.

[0095] Optionally, in the partition multi-frequency display mode, when the refresh frequency corresponding to the third display sub-region is different, and / or the refresh frequency corresponding to the fourth display sub-region is different, the brightness compensation data groups are different.

[0096] Among them, in the partition multi-frequency display mode, when the refresh frequencies corresponding to the third display sub-region are different and / or the refresh frequencies corresponding to the fourth display sub-region are different, the brightness compensation data groups are different, and the compensation data is more accurate, achieving a better compensation effect.

[0097] Optionally, at least two sample display panels have the same brightness compensation data corresponding to the third display sub-region in the same set display screen with the same partition refresh frequency. Among them, the same partition refresh frequency includes the same refresh frequency of the third display sub-region and the same refresh frequency of the fourth display sub-region.

[0098] Among them, in the set display screen, at least two sample display panels have the same brightness compensation data corresponding to the third display sub-region. The same brightness compensation data forms one level of brightness compensation data in the brightness compensation data group, which is used to compensate the display panel to be compensated subsequently, improving the display effect of the display panel to be compensated.

[0099] Optionally, at least two sample display panels have different brightness compensation data corresponding to the third display sub-region in the same set display screen with the same partition refresh frequency.

[0100] Among them, in the set display screen, at least two sample display panels have different brightness compensation data corresponding to the third display sub-region. The different brightness compensation data forms at least two levels of brightness compensation data in the brightness compensation data group, which is used to compensate the display panel to be compensated subsequently, improving the display effect of the display panel to be compensated.

[0101] Optionally, the set display screen is the display screen under the set display brightness level and the set display gray scale.

[0102] Among them, there can be multiple brightness compensation data groups. The same refresh frequency, the same set display brightness level, and different display gray scales can correspond to different brightness compensation data groups; the same refresh frequency, different set display brightness levels, and the same display gray scale can correspond to different brightness compensation data groups; different refresh frequencies, the same set display brightness level, and different display gray scales can correspond to different brightness compensation data groups. In this way, the multiple obtained brightness compensation data groups can make the compensation effect of the display screen of the display panel to be compensated better.

[0103] Optionally, the display panel to be compensated has different brightness compensation data groups corresponding to the set display screens with different set display brightness levels and / or different set display gray scales.

[0104] Among them, different set display brightness levels and / or different set display gray scales form different set display screens, and different set display screens corresponding to different brightness compensation data groups can make the brightness compensation data of the display panel to be compensated more accurate and the compensation effect better.

[0105] Optionally, for the same brightness level and display gray scale of the set display screen with different refresh frequencies corresponding to the first display sub-region and / or different refresh frequencies corresponding to the second display sub-region, the corresponding brightness compensation data sets are different;

[0106] Among them, different refresh frequencies corresponding to the first display sub-region and / or different refresh frequencies corresponding to the second display sub-region form different set display screens, and the corresponding brightness compensation data sets are different under the same brightness level and display gray scale, which can make the brightness compensation data more accurate and improve the compensation effect of the display panel.

[0107] Optionally, for the set display screens with different brightness levels and / or different display gray scales where the refresh frequencies corresponding to the first display sub-region are the same and the refresh frequencies corresponding to the second display sub-region are the same, the corresponding brightness compensation data sets are different.

[0108] Among them, for the set display screens with different brightness levels and / or different display gray scales where the refresh frequencies corresponding to the first display sub-region are the same and the refresh frequencies corresponding to the second display sub-region are the same, the corresponding different brightness compensation data sets can improve the compensation effect.

[0109] In some embodiments, for the set display screens with different brightness levels and / or different display gray scales where the refresh frequencies corresponding to the first display sub-region are the same and the refresh frequencies corresponding to the second display sub-region are the same, the corresponding brightness compensation data sets are the same.

[0110] Among them, for the set display screens with different brightness levels and / or different display gray scales where the refresh frequencies corresponding to the first display sub-region are the same and the refresh frequencies corresponding to the second display sub-region are the same, the same brightness compensation data sets can reduce the amount of target brightness compensation data and reduce the occupancy of storage space.

[0111] Optionally, S120 can be refined. Specifically, S120 is refined to include: S121. Use the brightness compensation data in the brightness compensation data set corresponding to the same refresh frequency, the same display brightness level, and the same display gray scale as the set display screen of the local refresh frame of the display panel to be compensated to perform brightness compensation on the first display sub-region of the display panel to be compensated.

[0112] Figure 4 It is a flowchart of a method for determining brightness compensation data of a display panel provided by an embodiment of the present invention. Refer to Figure 4 , the method for determining brightness compensation data of a display panel includes:

[0113] S110. Obtain the in-frame refresh, and acquire the brightness compensation data group corresponding to the first display sub-region of the display panel to be compensated. The brightness compensation data group includes at least two levels of brightness compensation data. Among them, in the in-frame refresh, the first display sub-region does not perform screen refreshing, while the second display sub-region performs screen refreshing.

[0114] S121. Use the brightness compensation data in the brightness compensation data group corresponding to the same partition refresh frequency, the same display brightness level, and the same display gray scale as the set display screen of the display panel to be compensated to perform brightness compensation on the first display sub-region of the display panel to be compensated.

[0115] Among them, the same partition refresh frequency means that the refresh frequency of the first display sub-region of the display panel to be compensated is the same as the refresh frequency of the third display sub-region in the sample display panel, and the refresh frequency of the second display sub-region of the display panel to be compensated is the same as the refresh frequency of the fourth display sub-region in the sample display panel; the same display brightness level means that the display brightness level of the display panel to be compensated is the same as the display brightness level in the sample display panel; the same display gray scale means that the display gray scale of the display panel to be compensated is the same as the display gray scale in the sample display panel; the compensation data group adopted by the display panel to be compensated is the brightness compensation data group corresponding to the same refresh frequency, the same display brightness level, and the same display gray scale of multiple sample display panels, and at least two levels of brightness compensation data in the corresponding brightness compensation data group are used for compensation. Since the refresh frequency, the display brightness level, and the display gray scale are all the same, a better compensation effect can be obtained.

[0116] S130. Determine the target brightness compensation data corresponding to the first display sub-region of the display panel to be compensated in the in-frame refresh under the set display screen from the brightness compensation data group according to the brightness difference.

[0117] Optionally, S130 is refined. Specifically, S130 is refined to include: S131. Determine the brightness compensation data with a corresponding brightness difference less than the preset brightness threshold in the brightness compensation data group as the target brightness compensation data; or, determine the brightness compensation data with the smallest corresponding brightness difference in the brightness compensation data group as the target brightness compensation data.

[0118] On the basis of the above embodiments, the embodiments of the present invention further provide a method for determining the brightness compensation data of a display panel. Figure 5 It is a flowchart of another method for determining the brightness compensation data of a display panel provided by the embodiments of the present invention. Refer to Figure 5 , the method for determining the brightness compensation data of a display panel includes:

[0119] S110. Obtain the local refresh frame, and acquire the brightness compensation data group corresponding to the first display sub-region of the display panel to be compensated. The brightness compensation data group includes at least two levels of brightness compensation data. Among them, in the local refresh frame, the first display sub-region does not perform screen refreshing, and the second display sub-region performs screen refreshing.

[0120] S120. Obtain the brightness difference between the first display sub-region and the second display sub-region under the set display screen in the partitioned multi-frequency display mode after the first display sub-region is compensated by at least one level of brightness compensation data.

[0121] S131. Determine the target brightness compensation data as the brightness compensation data in the brightness compensation data group corresponding to which the brightness difference is less than the preset brightness threshold; or determine the brightness compensation data corresponding to the smallest brightness difference in the brightness compensation data group as the target brightness compensation data.

[0122] Among them, when setting the preset brightness threshold, first compensate the display panel to be compensated with the brightness compensation data of the first level. If the brightness difference is greater than the preset brightness threshold, the brightness compensation data of the next level is required for compensation. When the brightness difference is less than the preset brightness threshold, the brightness compensation data corresponding to the level where the brightness difference is less than the preset brightness threshold is the target brightness compensation data; or, the brightness compensation data of each level in the brightness compensation data group can be used to compensate the display panel to be compensated, and the smallest brightness difference between the first display sub-region and the second display sub-region in the obtained display panel to be compensated is obtained. The smallest brightness difference meets the brightness difference requirement of the display panel, and the brightness compensation data corresponding to the smallest brightness difference is determined as the target brightness compensation data. If the brightness compensation data of any level cannot meet the display requirements of the display panel, repair is required.

[0123] Optionally, Figure 6 is a flowchart of another method for determining the brightness compensation data of a display panel provided by an embodiment of the present invention. Refer to Figure 6 , and further includes:

[0124] S110. Obtain the local refresh frame, and acquire the brightness compensation data group corresponding to the first display sub-region of the display panel to be compensated. The brightness compensation data group includes at least two levels of brightness compensation data. Among them, in the local refresh frame, the first display sub-region does not perform screen refreshing, and the second display sub-region performs screen refreshing.

[0125] S140. Determine the preliminary compensation data according to the brightness data of the display panel to be compensated under the display screen in the non-partitioned multi-frequency display mode.

[0126] Among them, in the display screen of the non-partitioned multi-frequency display mode, the refresh frequencies of the first display sub-region and the second display sub-region are the same; the preliminary compensation data is used to compensate for the uneven brightness under the display screen in the non-partitioned multi-frequency display mode.

[0127] Among them, in the display screen of the non-partition multi-frequency display mode, the refresh frequencies of the first display sub-region and the second display sub-region are the same. During actual adjustment, since the Mura of the display panel before compensation is relatively serious, therefore, it is necessary to determine the preliminary compensation data according to the brightness data of the display panel to be compensated in the display screen of the non-partition multi-frequency display mode. It is necessary to determine the preliminary compensation data for the first display sub-region and the second display sub-region of the display panel to be compensated in the display screen with the same refresh frequency. Subsequently, in the display screen of the non-partition multi-frequency, the preliminary compensation data is used for brightness compensation to achieve Demura.

[0128] S120. Obtain the brightness difference between the first display sub-region and the second display sub-region in the set display screen of the partition multi-frequency display mode after the first display sub-region is compensated with the brightness compensation data of at least one gear.

[0129] S130. According to the brightness difference, determine the target brightness compensation data of the first display sub-region of the display panel to be compensated corresponding to the local refresh frame in the set display screen from the brightness compensation data group.

[0130] Optionally, S120 is refined. Specifically, S120 is refined to include: S121. On the same machine where the preliminary compensation data is determined, obtain the brightness of the first display sub-region and the second display sub-region in the set display screen of the partition multi-frequency display mode after the first display sub-region is compensated with the brightness compensation data of at least one gear; S122. Obtain the brightness difference according to the brightness of the first display sub-region and the second display sub-region.

[0131] Figure 7 It is a flowchart of another method for determining the brightness compensation data of a display panel provided by an embodiment of the present invention. Refer to Figure 7 , the method for determining the brightness compensation data of a display panel includes:

[0132] S110. Obtain the brightness compensation data group corresponding to the first display sub-region of the display panel to be compensated in the local refresh frame. The brightness compensation data group includes the brightness compensation data of at least two gears; among them, in the local refresh frame, the first display sub-region does not perform screen refreshing, and the second display sub-region performs screen refreshing.

[0133] S140. Determine the preliminary compensation data according to the brightness data of the display panel to be compensated in the display screen of the non-partition multi-frequency display mode; among them, in the display screen of the non-partition multi-frequency display mode, the refresh frequencies of the first display sub-region and the second display sub-region are the same; the preliminary compensation data is used to compensate for the uneven brightness in the display screen of the non-partition multi-frequency display mode.

[0134] S121. On the same machine that determines the preliminary compensation data, obtain the brightness of the first display sub-region and the second display sub-region in the set display screen of the partition multi-frequency display mode after compensating the brightness compensation data of at least one gear in the first display sub-region.

[0135] Among them, after the preliminary compensation data is determined for the display panel to be compensated, the brightness compensation data in the brightness compensation data group corresponding to the same refresh frequency, the same display brightness level, and the same display gray scale as the set display screen of the local brush frame of the display panel to be compensated is used to perform brightness compensation on the first display sub-region of the display panel to be compensated; the compensated display panel can be photographed by a Demura machine, and the brightness of the first display sub-region and the second display sub-region in the set display screen of the local brush frame can accurately calculate the compensation effects corresponding to the brightness compensation data of different gears and judge the optimal results under all brightness compensation data. Performing compensation on the preliminary compensation data of the first display sub-region of the display panel to be compensated on the same machine that determines the preliminary compensation data can perform brightness compensation on the first display sub-region of the display panel to be compensated at the same position where the preliminary compensation data is determined, without moving the compensation position, making the process relatively simple.

[0136] Optionally, after determining the target brightness compensation data of the first display sub-region of the display panel to be compensated in the set display screen according to the brightness difference from the brightness compensation data group, it further includes: storing the target brightness compensation data on the same machine that determines the preliminary compensation data. In this way, by writing the brightness compensation data of at least one gear at the Demura site, the brightness difference between the first display sub-region and the second display sub-region of the display panel can be adjusted by writing the brightness compensation data of different gears at the Demura site.

[0137] S122. Obtain the brightness difference according to the brightness of the first display sub-region and the second display sub-region.

[0138] Among them, the ratio of the brightness of the first display sub-region and the second display sub-region is the brightness difference between the first display sub-region and the second display sub-region.

[0139] S130. Determine the target brightness compensation data corresponding to the first display sub-region of the display panel to be compensated in the set display screen according to the brightness difference from the brightness compensation data group.

[0140] Optionally, Figure 8 is a schematic diagram of a pixel circuit provided by an embodiment of the present invention. Refer to Figure 8, the display panel includes a plurality of pixel circuits 20, and the pixel circuit 20 includes a data writing module 21, a driving module 22, and a compensation module 23. The data writing module 21 is respectively connected to the data line Data and the first end S of the driving module 22, and the compensation module 23 is connected between the second end D and the control end G of the driving module 22;

[0141] The control end of the data writing module 21 is connected to the first scan line, and the control end of the compensation module 23 is connected to the second scan line. The data writing module 21 is configured to transmit the corresponding data voltage Data to the first end S of the driving module 22 according to the first scan signal SP1 on the first scan line during the data writing phases of the local refresh frame and the full refresh frame; the compensation module 23 is configured to be turned off according to the second scan signal SN2 on the second scan line during the local refresh frame and turned on during the full refresh frame.

[0142] Among them, the first scan signal SP1 can be a high refresh frequency. Whether it is a local refresh frame or a full refresh frame, the first scan signal SP1 includes low-level pulses. Each frame is refreshed from top to bottom. Refer to Figure 1 , it can be refreshed from the upper first display sub-region 11 and the second display sub-region 12 of the display panel to the lower first display sub-region 11; in each frame, the first end S and the second end D of the driving module 22 are charged by the data voltage Data for one row. In this state, since the data voltage Data is different, the hysteresis effect of the driving module 22 is different. For the pixel circuit in the first display sub-region 11, the second scan signal SN2 is connected to the gate of the compensation module 23. During the local refresh frame, the second scan signal SN2 is at a low level, and the gate of the compensation module 23 in the first display sub-region 11 is at a low level, so the compensation module 23 is turned off, and the data voltage Data is written to the control end G of the driving module 22 at a low refresh frequency. During the local refresh frame, for the pixel circuit in the second display sub-region 12, the second scan signal SN2 includes high-level pulses. During the local refresh frame, when the gate of the compensation module 23 in the second display sub-region 12 is at a high level, the compensation module 23 is turned on, and the data voltage Data is written to the control end G of the driving module 22 at a high refresh frequency per frame to achieve local refresh display.

[0143] Optionally, refer to Figure 8 , the brightness compensation data includes the first compensation data for the data voltage Data; in the first display sub-region, the data writing module 21 is configured to transmit the data voltage Data compensated by the brightness compensation data to the first end S of the driving module 22 during the data writing phase of the local refresh frame.

[0144] Figure 9 is a timing diagram of a pixel circuit. Refer to Figure 9, in the prior art during local refresh, the start signal SinP1 serves as the input signal of the first scan driving circuit. The first scan driving circuit generates the first scan signal SP1 based on the start signal SinP1. The start signal SinP1 is equal to the refresh frequency of the second sub-display area 12. The first end S, that is, the Source end, of the driving module 22 corresponding to the first display sub-area is in an open circuit (Hiz) state; the partition control signal VrefE serves as the input signal of the second scan driving circuit. The second scan driving circuit is used to generate the second scan signal SN2 according to the control signal VrefE. The voltage of VrefE is related to the local refresh range of the display panel. Exemplarily, Figure 10 is a display panel and the corresponding driving timing diagram thereof. Referring to FIG. 10, a high voltage of VrefE corresponds to the second display sub-area 12 (the high voltage of the partition control signal VrefE overlaps with the low-level pulse of the first scan signal accessed by the data writing module in the second display sub-area 12), and a low voltage of VrefE corresponds to the first display sub-area (the low voltage of the partition control signal VrefE overlaps with the low-level pulse of the first scan signal accessed by the data writing module in the first display sub-area 11).

[0145] Exemplarily, the second display sub-area 12 uses a 120Hz refresh; the first display sub-area 11 uses a 1Hz refresh; due to different refresh frequencies, the charging phases and the characteristics of the driving modules in the first display sub-area 11 and the second display sub-area 12 are different. Therefore, there is a brightness difference between the first display sub-area 11 and the second display sub-area 12 of the display panel; in the multi-frequency display mode of partitions, during normal refresh, the data voltage of the first display sub-area 11 will affect the voltages of the first end and the second end of the driving module, thereby affecting the source-drain bias and the hysteresis state of the driving module, affecting the on state of the driving module, and ultimately affecting the brightness of the light-emitting module and the brightness of the first display sub-area. Figure 11 is the timing diagram of a pixel circuit provided by an embodiment of the present invention. Refer to Figure 11, the start signal SinP1 serves as the input signal of the first scan driving circuit. The first scan driving circuit generates the first scan signal SP1 according to the start signal SinP1. The start signal SinP1 is equal to the refresh frequency of the second sub-display area 12. The first end S of the driving module 22 corresponding to the first display sub-area; compensates the data voltage written to the first end S, adjusts the data voltage to an appropriate voltage, which is different from the state where the Source end is in an open circuit (Hiz) state in the prior art, and can change the hysteresis state of the driving module 22 corresponding to the first display sub-area 11. When the full-frame is refreshed, the voltage charged into Cst changes accordingly, adjusts the brightness of the first display sub-area to be consistent with that of the second display sub-area, and can improve the brightness difference between the first display sub-area and the second display sub-area. That is, in this embodiment, by setting the brightness compensation data to include the first compensation data for the data voltage Data, that is, by compensating the data voltage in the local refresh frame of the partition multi-frequency display, the hysteresis state of the driving module during the partition multi-frequency display can be changed, thereby compensating the emission brightness and reducing the brightness difference between the first display sub-area and the second display sub-area.

[0146] In some embodiments, the data voltage Data corresponding to the pixel circuit in the first display sub-area during the data writing stage of the local refresh frame and the data writing stage of the full refresh frame may be different; the data voltage Data corresponding to the pixel circuit in the second display sub-area during the data writing stage of the local refresh frame and the data writing stage of the full refresh frame may be the same. Among them, the data voltage Data corresponding to the pixel circuit in the first display sub-area during the data writing stage of the full refresh frame corresponds to the display gray level; the data voltage Data corresponding to the pixel circuit in the second display sub-area during the data writing stages of the local refresh frame and the full refresh frame both correspond to the display gray level.

[0147] Optionally, refer to Figure 1 and Figure 8 , in the second display sub-area 12, the data writing module 21 is used to transmit the data voltage compensated by the preliminary compensation data to the first end S of the driving module 22 during the data writing stage of the local refresh frame.

[0148] Among them, in the second display sub-area 12, the data writing module 21 is used to transmit the data voltage compensated by the preliminary compensation data to the first end S of the driving module 22 during the data writing stage of the local refresh frame, and can compensate the brightness of the second display sub-area 12 according to the preliminary compensation data, improve the uneven brightness of the second display sub-area, and improve the display effect.

[0149] Optionally, refer to Figure 1 and Figure 8 , in the first display sub-area 11 and the second display sub-area 12, the data writing module 21 is used to transmit the data voltage compensated by the preliminary compensation data to the first end S of the driving module 22 during the data writing stage of the full refresh frame.

[0150] Among them, in the first display sub-region 11 and the second display sub-region 12, the data writing module 21 is used to transmit the data voltage after preliminary compensation data compensation to the first end S of the driving module 22 during the data writing stage of the full refresh frame, and compensate the brightness of the first display sub-region 11 and the second display sub-region 12 according to the preliminary compensation data, which can improve the brightness unevenness of the first display sub-region 11 and the second display sub-region 12 and improve the display effect.

[0151] Optionally, referring to Figure 8 , the display panel includes a plurality of pixel circuits 20, the pixel circuit 20 includes a first initialization module 24 and a driving module 22, the first initialization module 24 is respectively connected to the first initialization signal line, the first end S or the second end D of the driving module 22; the control end of the first initialization module 24 is connected to the third scan line; the first initialization module 24 is used to transmit the first initialization voltage on the first initialization signal line to the first end or the second end of the driving module 22 according to the third scan signal SP2 on the third scan line during the first initialization stage of the partial refresh frame and the full refresh frame.

[0152] Optionally, the brightness compensation data includes second compensation data for the first initialization voltage; in the first display sub-region, the first initialization module is used to transmit the first initialization voltage after being compensated by the second compensation data to the first end or the second end of the driving module during the first initialization stage of the partial refresh frame.

[0153] Optionally, the pixel circuit 20 further includes a second initialization module 25, the second initialization module 25 is connected to the second end D of the driving module 22 and the second initialization signal line, and the control end of the second initialization module 25 is connected to the fourth scan line; the second initialization module 25 is used to transmit the second initialization voltage on the second initialization signal line to the second end of the driving module 22 according to the fourth scan signal SN1 on the fourth scan line during the second initialization stage of the partial refresh frame and the full refresh frame.

[0154] Optionally, the brightness compensation data includes third compensation data for the second initialization voltage; in the first display sub-region, the second initialization module is used to transmit the second initialization voltage after being compensated by the third compensation data to the second end of the driving module during the second initialization stage of the partial refresh frame.

[0155] Among them, the first initialization module 24 is used to initialize the first end S or the second end D of the driving module 22; Figure 12 is the timing diagram of another pixel circuit provided by the embodiment of the present invention, referring to Figure 12, by performing negative voltage compensation on Vrefn1 of the second initialization module 25 corresponding to the first display sub-region of the local refresh frame and positive voltage compensation on Vrefp of the first initialization module 24 corresponding to the first display sub-region of the local refresh frame, that is, adjusting Vrefn1 and Vrefp corresponding to the first display sub-region of the local refresh frame, to make the reset state of the first display sub-region different from that of the second display sub-region, so as to adjust the display brightness of the first display sub-region. In this embodiment, by setting the brightness compensation data to include the second compensation data for the first initialization voltage or the third compensation data for the second initialization voltage, that is, by compensating the initialization voltage within the local refresh frame of the multi-frequency display of partitions, the hysteresis state of the driving module during the multi-frequency display of partitions can be changed, thereby compensating the emission brightness and reducing the brightness difference between the first display sub-region and the second display sub-region.

[0156] Based on the above embodiment, an embodiment of the present invention provides a method for compensating the brightness of a display panel. Figure 13 It is a flowchart of a method for compensating the brightness of a display panel provided by an embodiment of the present invention. Refer to Figure 13 , the compensation method includes:

[0157] S210. When the display panel is in the multi-frequency display mode of partitions, determine the final compensation data corresponding to the first display sub-region from the target brightness compensation data at least according to the refresh frequencies of the first display sub-region and the second display sub-region in the display panel; wherein, the target brightness compensation data is determined by using the brightness compensation data determination method described in any embodiment of the present invention.

[0158] Among them, for each first display sub-region and second display sub-region in the display panel, there is corresponding target brightness compensation data for each refresh frequency, each display brightness level, and each display gray scale; at the Demura site, the target brightness compensation data corresponding to different set display screens (for example, different partition refresh frequencies, different display brightness levels, or different display gray scales) can be written into the display panel and stored in the corresponding registers. By writing different target brightness compensation data at the Demura site and determining the final brightness compensation data from the target brightness compensation data according to the target display screen during subsequent driving, the brightness difference between each first display sub-region and second display sub-region in the display panel can be adjusted.

[0159] Determine the target compensation data corresponding to the first display sub-region in the set display screen closest to the target display screen as the final compensation data according to the refresh frequencies, corresponding display brightness levels, and corresponding display gray scales of the first display sub-region and the second display sub-region corresponding to the target display screen of the display panel. In some embodiments, the target compensation data corresponding to the first display sub-region in the set display screen identical to the target display screen (with the same partition refresh frequency, the same display brightness level, and the same display gray scale) is used as the final compensation data.

[0160] S220. Perform in-frame local dithering, and use the final compensation data to perform brightness compensation on the first display sub-region.

[0161] Among them, using the final compensation data to perform brightness compensation on the first display sub-region can comprehensively cover the brightness differences between the first display sub-region and the second display sub-region of different display panels.

[0162] The brightness compensation method for the display panel provided by the technical solution of the embodiment of the present invention and the brightness compensation data determination method for the display panel described in any embodiment of the present invention have the same beneficial effects.

[0163] Based on the above embodiments, the present invention further provides a display panel, which performs brightness compensation by using the brightness compensation method for the display panel described in any embodiment of the present invention.

[0164] The display panel provided by the technical solution of the embodiment of the present invention and the brightness compensation method for the display panel described in any embodiment of the present invention have the same beneficial effects.

[0165] It should be understood that various forms of the processes shown above can be used, reordering, adding, or deleting steps. For example, the steps described in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is imposed herein.

[0166] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for determining brightness compensation data of a display panel, characterized in that: The display panel to be compensated comprises a first display sub-area and a second display sub-area, and in a partitioned multi-frequency display mode, a refresh frequency of the first display sub-area is lower than a refresh frequency of the second display sub-area; The brightness compensation data determination method comprises: Acquire a brightness compensation data group corresponding to a first display sub-area of ​​a display panel to be compensated in a partial refresh frame, wherein the brightness compensation data group includes brightness compensation data of at least two levels; wherein, in the partial refresh frame, the first display sub-area does not perform screen refresh, and the second display sub-area performs screen refresh; Acquire a brightness difference between the first display sub-area and the second display sub-area in a set display screen of the partitioned multi-frequency display mode after the first display sub-area is compensated by the brightness compensation data of at least one level; According to the brightness difference, target brightness compensation data corresponding to the first display sub-area of ​​the display panel to be compensated in the local refresh frame under the set display picture is determined from the brightness compensation data group.

2. The method for determining brightness compensation data according to claim 1, characterized in that: The step of obtaining a brightness compensation data group corresponding to a first display sub-area of ​​a display panel to be compensated in a local refresh frame, wherein the brightness compensation data group includes brightness compensation data of at least two levels, including: Respectively obtain brightness compensation data of the corresponding gear of the third display sub-area of ​​a plurality of sample display panels under at least one set display screen of the partitioned multi-frequency display mode, and form the brightness compensation data group with the brightness compensation data of at least two gears; wherein the sample display panel includes a third display sub-area and a fourth display sub-area, and under the local refresh frame, the third display sub-area does not perform screen refresh, and the fourth display sub-area performs screen refresh; Preferably, the brightness compensation data is configured to make the brightness difference between the third display sub-area and the fourth display sub-area of ​​at least one sample display panel smaller than a preset value; Preferably, the third display sub-area corresponds to the position of the first display sub-area, and the fourth display sub-area corresponds to the position of the second display sub-area; Preferably, the third display sub-area has the same refresh frequency as the first display sub-area, and the fourth display sub-area has the same refresh frequency as the second display sub-area; Preferably, the setting display screen includes at least two; Preferably, at least two of the set display screens correspond to different partition refresh frequencies; the different partition refresh frequencies include different refresh frequencies corresponding to the third display sub-area and / or different refresh frequencies corresponding to the fourth display sub-area; Preferably, in the partitioned multi-frequency display mode, when the refresh frequencies corresponding to the third display sub-areas are different, and / or the refresh frequencies corresponding to the fourth display sub-areas are different, the brightness compensation data groups are different; Preferably, at least two sample display panels have the same brightness compensation data corresponding to the third display sub-area under the same set display screen with the same partition refresh frequency; wherein the same partition refresh frequency includes the same refresh frequency of the third display sub-area and the same refresh frequency of the fourth display sub-area; Preferably, at least two sample display panels have different brightness compensation data corresponding to the third display sub-area under the same set display screen with the same sub-area refresh frequency; Preferably, the set display picture is a display picture with a set display brightness level and a set display grayscale; Preferably, the brightness compensation data groups corresponding to the set display pictures of the display panel to be compensated are different when the set display brightness levels and / or the set display grayscales are different; Preferably, the first display sub-area corresponds to different refresh frequencies and / or the second display sub-area corresponds to different refresh frequencies, and the brightness compensation data groups corresponding to the same brightness level and display grayscale setting display screen are different; Preferably, the brightness compensation data groups corresponding to the display screens with the same refresh frequency corresponding to the first display sub-area and the same refresh frequency corresponding to the second display sub-area are different for different brightness levels and / or different display grayscale settings.

3. The method for determining brightness compensation data according to claim 2, characterized in that: The obtaining of the brightness difference between the first display sub-area and the second display sub-area after the first display sub-area is compensated by the brightness compensation data of at least one level, under the set display screen of the partitioned multi-frequency display mode, comprises: The brightness compensation data in the brightness compensation data group corresponding to the set display picture of the display panel to be compensated, the same partition refresh frequency, the same display brightness level and the same display grayscale are used to perform brightness compensation on the first display sub-area of ​​the display panel to be compensated.

4. The method for determining brightness compensation data according to claim 1, characterized in that: The step of determining, from the brightness compensation data group, target brightness compensation data corresponding to the first display sub-area of ​​the display panel to be compensated in the local refresh frame under the set display picture according to the brightness difference comprises: Determine the brightness compensation data in the brightness compensation data group, corresponding to the brightness difference being less than a preset brightness threshold, as the target brightness compensation data; Alternatively, the brightness compensation data corresponding to the minimum brightness difference in the brightness compensation data group is determined as the target brightness compensation data.

5. The method for determining brightness compensation data according to claim 1, characterized in that: After the brightness compensation data of the first display sub-area is obtained and compensated for at least one level, before the brightness difference between the first display sub-area and the second display sub-area is calculated in the set display screen of the partitioned multi-frequency display mode, the method further includes: Preliminary compensation data is determined based on brightness data of the display panel to be compensated in a display picture of a non-partitioned multi-frequency display mode; wherein, in the display picture of the non-partitioned multi-frequency display mode, the refresh frequencies of the first display sub-area and the second display sub-area are the same; and the preliminary compensation data is used to compensate for uneven brightness in the display picture of the non-partitioned multi-frequency display mode.

6. The method for determining brightness compensation data according to claim 5, characterized in that: The obtaining of the brightness difference between the first display sub-area and the second display sub-area after the first display sub-area is compensated by the brightness compensation data of at least one level, under the set display screen of the partitioned multi-frequency display mode, comprises: On the same machine where the preliminary compensation data is determined, obtaining the brightness of the first display sub-area and the second display sub-area in the set display screen of the partitioned multi-frequency display mode after the first display sub-area is compensated by the brightness compensation data of at least one level; Obtaining the brightness difference according to the brightness of the first display sub-area and the second display sub-area; Preferably, according to the brightness difference, after determining from the brightness compensation data group that the first display sub-area of ​​the display panel to be compensated under the set display screen has the target brightness compensation data corresponding to the local refresh frame, it also includes: storing the target brightness compensation data on the same machine that determines the preliminary compensation data.

7. The method for determining brightness compensation data according to claim 5, characterized in that: The display panel includes a plurality of pixel circuits, and the pixel circuits include a data writing module, a driving module and a compensation module, wherein the data writing module is respectively connected to a data line and a first end of the driving module, and the compensation module is connected between a second end of the driving module and a control end; The control end of the data writing module is connected to the first scan line, and the control end of the compensation module is connected to the second scan line. The data writing module is used to transmit the corresponding data voltage to the first end of the driving module in the data writing stage of the partial refresh frame and the full refresh frame according to the first scan signal on the first scan line; the compensation module is used to turn off in the partial refresh frame and turn on in the full refresh frame according to the second scan signal on the second scan line; Preferably, the brightness compensation data includes first compensation data for the data voltage; in the first display sub-area, the data writing module is used to transmit the data voltage compensated by the brightness compensation data to the first end of the driving module during the data writing stage of the local refresh frame; Preferably, in the second display sub-area, the data writing module is used to transmit the data voltage compensated by the preliminary compensation data to the first end of the driving module during the data writing phase of the local refresh frame; Preferably, in the first display sub-area and the second display sub-area, the data writing module is used to transmit the data voltage compensated by the preliminary compensation data to the first end of the driving module during the data writing stage of the full refresh frame.

8. The method for determining brightness compensation data according to claim 1, characterized in that: The display panel includes a plurality of pixel circuits, and the pixel circuits include a first initialization module and a driving module, wherein the first initialization module is connected to a first initialization signal line and a first end or a second end of the driving module respectively; a control end of the first initialization module is connected to a third scanning line; the first initialization module is used to transmit a first initialization voltage on the first initialization signal line to the first end or the second end of the driving module in a first initialization stage of a partial refresh frame and a full refresh frame according to a third scanning signal on the third scanning line; Preferably, the brightness compensation data includes second compensation data for the first initialization voltage; in the first display sub-area, the first initialization module is used to transmit the first initialization voltage compensated by the second compensation data to the first end or the second end of the driving module in the first initialization stage of the local refresh frame; Preferably, the pixel circuit further comprises a second initialization module, the second initialization module is connected to the second end of the driving module and the second initialization signal line, and the control end of the second initialization module is connected to the fourth scanning line; the second initialization module is used for transmitting the second initialization voltage on the second initialization signal line to the second end of the driving module in the second initialization stage of the partial refresh frame and the full refresh frame according to the fourth scanning signal on the fourth scanning line; Preferably, the brightness compensation data includes third compensation data for the second initialization voltage; in the first display sub-area, the second initialization module is used to transmit the second initialization voltage compensated by the third compensation data to the second end of the driving module in the second initialization stage of the local refresh frame.

9. A brightness compensation method for a display panel, characterized in that: include: When the display panel is in a partitioned multi-frequency display mode, final compensation data corresponding to the first display sub-area is determined from the target brightness compensation data at least according to the refresh frequencies of the first display sub-area and the second display sub-area in the display panel; wherein the target brightness compensation data is determined by the brightness compensation data determination method according to any one of claims 1 to 8; In a local refresh frame, the final compensation data is used to perform brightness compensation on the first display sub-area.

10. A display panel, characterized in that: The brightness compensation method of the display panel according to claim 9 is used to perform brightness compensation.

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