Compensation method for display panel, and display panel

Abstract

Provided in the present application are a compensation method for a display panel, and a display panel. The compensation method comprises: on the basis of first target pictures of a plurality of test panels, acquiring brightness values respectively corresponding to m preset points on the plurality of test panels; on the basis of the brightness values respectively corresponding to the m preset points on the plurality of test panels, determining a first compensation value for a display panel to be subjected to compensation; on the basis of a second target picture of said display panel, acquiring a plurality of pieces of image data of said display panel; on the basis of the image data, determining a second compensation value for said display panel; and on the basis of the first compensation value and the second compensation value, determining a final compensation value for said display panel, and using the final compensation value to compensate for said display panel.

Description

Compensation methods for display panels and display panels

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411748900.4, filed on November 29, 2024, entitled “Compensation Method for Display Panel and Display Panel”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of display technology, and more specifically, to a compensation method for a display panel and a display panel. Background Technology

[0004] Because of the impedance on the PVDD / PVEE traces on the display panel, and due to the trace length, the trace resistance at the far IC end is greater than that at the near IC end. In addition, due to the IR Drop phenomenon that causes the internal voltage of the device to drop when current passes through the device in the OLED display, the PVDD voltage at the far IC end is smaller than that at the near IC end. Therefore, the OLED driving current at the far IC end is smaller, resulting in uneven brightness of the display panel.

[0005] The relevant technologies address the above problems by using voltage decay compensation (VDC ON) to compensate for the brightness of the OLED display panel, thus solving the problem of uneven brightness in the OLED display panel.

[0006] However, when using voltage attenuation compensation to enter a low brightness high contrast (LHBM) screen, the brightness of the first frame of the screen will have obvious flickering. At this time, VDC needs to be turned off, that is, VDC ON is changed to VDC OFF, which can solve the flickering problem that occurs in the first frame of the LHBM screen. However, turning off VDC will cause the brightness uniformity of the panel W255 to deteriorate. Specifically, the brightness uniformity loss is generally 7.54%. Summary of the Invention

[0007] The main objective of this application is to provide a compensation method and a display panel to at least solve the problem of uneven panel brightness when VDC OFF in related technologies.

[0008] To achieve the aforementioned objective, according to one aspect of this application, a method for compensating a display panel is provided, comprising: acquiring brightness values ​​corresponding to m preset points on the plurality of test panels based on a first target image of the plurality of test panels; determining a first compensation value for a display panel to be compensated based on the brightness values ​​corresponding to the m preset points on the plurality of test panels; acquiring a plurality of image data of the display panel to be compensated based on a second target image of the display panel to be compensated; determining a second compensation value for the display panel to be compensated based on the image data; determining a final compensation value for the display panel to be compensated based on the first compensation value and the second compensation value, and using the final compensation value to compensate the display panel to be compensated.

[0009] According to another aspect of this application, a method for compensating a display panel is provided, comprising: preparing a plurality of test panels and performing a brightness test on each of the test panels to obtain brightness values ​​of a plurality of test points on the test panels; using an image acquisition device to acquire an image of the display panel to be compensated to obtain image data of the display panel to be compensated; using a processing device to determine a final compensation value of the display panel to be compensated based on a first compensation value and a second compensation value, and writing the final compensation value into a driver integrated circuit, so that the driver integrated circuit reads the final compensation value to compensate the display panel to be compensated, wherein the first compensation value is determined based on the brightness values ​​of all the test points, and the second compensation value is extracted from the image data.

[0010] According to another aspect of this application, a display panel is provided, wherein the display brightness of the display panel is determined by any of the compensation methods of the display panel described above.

[0011] Applying the technical solution of this application, the above-mentioned compensation method for the display panel firstly uses multiple test panels to display a first target image, and determines a first compensation value for the display panel to be compensated based on the brightness values ​​of multiple preset points on each test panel. Then, it determines a second compensation value for the display panel to be compensated through a second target image of the display panel to be compensated. Based on the first compensation value and the second compensation value, it determines a final compensation value for the display panel to be compensated, and uses the final compensation value to compensate the display panel to be compensated. This method calculates a first compensation value (offset compensation value) by testing the test panel, determines a second compensation value (mura compensation value) by using a second target image of the display panel to be compensated, and generates a brightness compensation map using an algorithm based on the first and second compensation values. The display panel is compensated using these two compensation values, improving the brightness uniformity of the display panel. This eliminates the need to enable voltage attenuation compensation (VDC ON) for brightness compensation, thus avoiding the problem of deteriorated brightness uniformity caused by turning off VDC (VDC OFF) when the brightness of the first frame of a low-brightness, high-contrast (LHBM) image is noticeably flickering. In other words, it solves the problem of uneven panel brightness when VDC OFF is used in related technologies. Attached Figure Description

[0012] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0013] Figure 1 shows a schematic diagram of a display panel provided according to an embodiment of this application;

[0014] Figure 2 shows a schematic diagram of a display principle of a display panel provided according to an embodiment of this application;

[0015] Figure 3 shows a schematic flowchart of a compensation method for a display panel provided according to an embodiment of this application;

[0016] Figure 4 shows a schematic diagram of a test panel and preset points provided according to an embodiment of this application;

[0017] Figure 5 shows a schematic diagram of the correspondence between a test panel and a first sub-compensation value according to an embodiment of this application;

[0018] Figure 6 shows another schematic flowchart of a compensation method for a display panel provided according to an embodiment of this application;

[0019] Figure 7 shows a schematic diagram of a compensation effect of a display panel provided according to an embodiment of this application;

[0020] Figure 8 shows another schematic flowchart of a compensation method for a display panel provided according to an embodiment of this application.

[0021] The above figures include the following reference numerals: 100, display panel; 110, display area; 120, integrated circuit. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] For ease of description, the following explains some of the nouns or terms used in the embodiments of this application:

[0026] Voltage Decay Compensation (VDC) is a voltage stabilization technology used in power systems. Its principle is to maintain voltage stability in the circuit by compensating for voltage drops in the circuit.

[0027] As described in the background section, as shown in Figure 1, the display panel 100 includes a display area 110 and a non-display area (not shown in the figure), with an integrated circuit 120 (IC) arranged in the non-display area. As shown in Figures 1 and 2, multiple data lines are arranged in the non-display area of ​​the display panel 100 to support the light emission of the display area 110. Each row of light-emitting units has a corresponding driving circuit to drive its light emission. As shown in Figure 2, for example, from the near IC end to the IC end, multiple driving circuits are respectively used to drive the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit to emit light. As shown in the structure in Figure 2, there is impedance on the PVDD traces in the non-display area of ​​the display panel 100, and the trace resistance at the far IC end is greater than that at the near IC end, that is, there is current attenuation. The decrease in current causes the PVDD voltage at the far IC end to be smaller than that at the near IC end, that is, the driving current of the OLED (light-emitting unit) at the far IC end is smaller, which will cause uneven brightness in the display area 110 of the display panel, that is, the screen near the IC end is bright and the screen far from the IC end is dark. In practical applications, uneven brightness may occur between the areas near and far from the IC on the display area 110.

[0028] In related technologies, voltage attenuation compensation (VDC) is used to avoid uneven brightness across the display panel. Currently, this uneven brightness is generally compensated for using the following VDC ON scheme:

[0029] 1. Measure the load condition of the panel with uneven brightness;

[0030] 2. Calculate the compensation value of the panel and store it in DDIC via code;

[0031] 3. Adjust the gain value of pixel Vdata using DDIC to ensure that the brightness of the upper, middle, and lower parts is basically consistent.

[0032] However, voltage attenuation compensation is a voltage stabilization technology used in power systems. Its principle is to maintain voltage stability in the circuit by compensating for voltage drops. However, in low-brightness, high-contrast scenarios, the display device needs to perform voltage attenuation compensation based on the input signal to ensure the correct brightness and contrast of the displayed image. However, due to the characteristics of low brightness and high contrast, the voltage attenuation compensation function may not effectively handle changes in screen brightness, resulting in noticeable flickering in the first frame. Therefore, to avoid flickering, VDC is generally turned off when entering low-brightness, high-contrast (LHBM) scenes, i.e., VDC ON is switched to VDC OFF. However, after turning off VDC, the panel lacks additional brightness compensation, leading to a deterioration in brightness uniformity, specifically a brightness uniformity degradation of 7.54% (this value was obtained experimentally, meaning that an average of 154 samples out of 2015 test samples showed brightness uniformity degradation), which cannot meet the image requirements in applications.

[0033] To address the issue of uneven panel brightness during VDC OFF in related technologies, embodiments of this application provide a compensation method for a display panel and a display panel.

[0034] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0035] This embodiment provides a compensation method for a display panel. It should be noted that, although the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown here.

[0036] Figure 3 is a flowchart of a compensation method for a display panel according to an embodiment of this application. As shown in Figure 3, the method includes the following steps:

[0037] Step S101: Based on the first target image of multiple test panels, obtain the brightness values ​​corresponding to m preset points on the multiple test panels respectively;

[0038] As shown in Figure 4, the test panel 200 in Figure 4 has 15 preset points 210, i.e., m = 15. The preset points 210 are set along the length of the test panel 200, that is, along the central axis of the test panel 200, with an average of 15 preset points 210. Based on the first target image displayed on the test panel 200, the brightness values ​​corresponding to all preset points 210 are obtained. It should be noted that the value of m can be adjusted according to the actual application. The above is only one embodiment and is not limited to the above value.

[0039] As shown in Figure 4, the plurality of preset points 210 on the test panel 200 are arranged according to a preset arrangement rule. The preset arrangement rule is that the plurality of preset points 210 are arranged from the IC end closer to the IC end of the test panel 200 to the IC end farther away, or from the IC end farther away to the IC end closer to the IC end, and / or the preset points 210 on the test panel 200 are arranged at equal intervals, or at non-equal intervals.

[0040] Because the display brightness differs between the near and far ends of the display panel, the preset points on the test panel should also be set according to this characteristic. That is, preset points should be set sequentially from the near end to the far end (or vice versa) of the test panel. This ensures coverage across the entire display panel, compensating for the brightness of each display area on the panel to be compensated.

[0041] The aforementioned first target image includes a standard brightness of 255 gray levels. The higher the gray level of the display panel, the higher the brightness of the display panel, and the higher the corresponding current and voltage drop. Therefore, the higher the gray level of the display panel, the more severe the unevenness of brightness between the positions near and far from the IC on the display area. The first target image can be set to 255 gray levels, which can better compensate for the brightness uniformity of 255 gray levels.

[0042] In addition, the preset points can be arranged at equal intervals or at non-equal intervals. Equal intervals can be selected, which can evenly distribute the entire display area of ​​the display panel and provide high uniformity and stability of brightness compensation.

[0043] Step S102: Based on the brightness values ​​corresponding to the m preset points of the multiple test panels, determine the first compensation value of the display panel to be compensated.

[0044] Because the display brightness of the near IC end and the far IC end of the display panel to be compensated is different, the compensation values ​​for the position points of the near IC end and the far IC end of the display panel to be compensated are also different.

[0045] Similarly, when testing the test panel in advance, since the compensation values ​​at different positions of the panel need to be obtained separately, there should also be corresponding compensation values ​​at different positions of the test panel. That is, the first compensation value mentioned above includes multiple first sub-compensation values. The i-th preset point of the test panel has a corresponding first sub-compensation value, where i≤m, and i and m are both positive integers greater than 0.

[0046] The first compensation value refers to the compensation value used to compensate the entire display panel to be compensated, while the first sub-compensation value is the compensation value used to compensate different positions on the display panel to be compensated. In other words, the first compensation value is a set of multiple first sub-compensation values, and the first sub-compensation values ​​compensate the brightness of different positions on the display panel to be compensated.

[0047] Since the display brightness of the near IC end and the far IC end of the display panel are different, and the preset points need to be evenly distributed along the central axis of the display panel, when the display panel is displaying an image, the brightness values ​​of different preset points are at least partially different, and thus the compensation values ​​of the display panel parts corresponding to different preset points are also at least partially different. Therefore, the first sub-compensation values ​​of at least two different preset points are different.

[0048] In some instances, based on the brightness values ​​corresponding to the m preset points of multiple test panels, the first compensation value of the display panel to be compensated is determined, including the following steps:

[0049] Step S201: Based on the brightness values ​​corresponding to the above m preset points, determine the first sub-compensation value corresponding to each of the above preset points.

[0050] Step S201 above also includes the following steps:

[0051] Step S2011: Light up the first target screen of the test panel and obtain the brightness values ​​of the m preset points under the first target screen.

[0052] Step S2012: The j-th preset point is determined as the reference point of the test panel, the brightness value of the j-th preset point of the test panel is determined as the reference brightness value, and the brightness value of the i-th preset point of the display panel to be compensated is determined as the test brightness value, where j≤m and j is a positive integer greater than 0.

[0053] In some instances, the j-th preset point is the center of the display area of ​​the test panel.

[0054] Because the brightness is higher near the IC (interface) in a display panel and lower further away, the brightness at the center of the display area is generally the center value of the entire display panel. Using the center brightness as a reference helps maintain the balance and stability of the displayed image, effectively reduces power consumption, and extends the monitor's lifespan. Furthermore, adjusting the brightness based on the center value ensures optimal display quality, avoiding overly bright or dark situations. Adjusting the brightness at the center value ensures even brightness across the entire screen, guaranteeing image clarity and color accuracy. Additionally, adjusting the center brightness value effectively saves power and extends the monitor's lifespan.

[0055] Step S2013: The ratio of the above-mentioned test brightness value to the above-mentioned reference brightness value is determined as the above-mentioned first sub-compensation value.

[0056] Specifically, the ratio of the test brightness value to the reference brightness value can reflect the proportional relationship between the brightness value of the i-th preset point and the brightness value of the reference point, and further reflect the degree of brightness difference between the brightness value of the i-th preset point and the brightness value of the reference point, that is, the degree to which the brightness value of the i-th preset point is brighter (or darker) than the brightness value of the reference point. Therefore, based on the degree of brightness difference, the brightness of the display area corresponding to the i-th preset point on the display panel to be compensated is adjusted. Thus, in this embodiment, the ratio of the test brightness value to the reference brightness value is determined as the first sub-compensation value.

[0057] Step S202: Determine the first sub-compensation value of the display panel to be compensated based on the first sub-compensation value of all the above-mentioned test panels.

[0058] The test panel includes at least a first preset test panel and a second preset test panel, and the first sub-compensation value of the first preset test panel and the second preset test panel are different.

[0059] To increase the accuracy and application scope of the first sub-compensation value, multiple test panels can be used to confirm the first sub-compensation value. The more test panels used, the more accurate the confirmation of the first sub-compensation value will be. However, to consider the impact of cost, the number of test panels also needs to be controlled. Generally, ten test panels are used to obtain ten sets of first compensation values ​​for a preset point.

[0060] In some instances, determining the first sub-compensation value of the display panel to be compensated based on the first sub-compensation values ​​of all the aforementioned test panels includes: removing the lowest and highest first sub-compensation values ​​from all the first sub-compensation values ​​of the aforementioned test panels to obtain a target initial set; and determining the average value of all the aforementioned first sub-compensation values ​​in the target initial set as the first sub-compensation value.

[0061] Removing the lowest and highest values ​​eliminates the influence of points with higher errors on the final calculation result, improving the accuracy of the final result; it eliminates the influence of possible extreme values ​​on the mean, making the mean more accurately reflect the central trend of the data; it reduces data volatility, making the mean more representative and better reflecting the overall characteristics of the data; removing the highest and lowest values ​​reduces data skewness, making the mean more reliable and stable; in some specific cases, such as when the data is disturbed by extreme values ​​or has outliers, removing the highest and lowest values ​​can make the mean more meaningful and valuable for reference. The above embodiment is one way to calculate the first sub-compensation value.

[0062] In other instances, determining the first sub-compensation value of the display panel to be compensated based on the first sub-compensation value of all the aforementioned test panels includes: determining the median of all the aforementioned first sub-compensation values ​​as the first sub-compensation value of the display panel to be compensated.

[0063] The median reduces the likelihood of being affected by extreme values ​​because it represents the middle value of all data and is unaffected by extreme values. Compared to the mean, the median better reflects the central tendency of the data, especially when the data distribution is uneven or outliers are present. The median is more representative and better reflects the overall data situation, avoiding deviations in the first sub-compensation value due to the presence of extreme values. Therefore, the above embodiment represents another method for calculating the first sub-compensation value.

[0064] In some examples, as shown in Figure 4, the test panel is divided into 15 sections along its central axis, and 15 sets of brightness values ​​are measured. Assuming one set of brightness values ​​is: 530 nit, 540 nit, 550 nit, 560 nit, 570 nit, 580 nit, 590 nit, 600 nit, 610 nit, 620 nit, 630 nit, 640 nit, 650 nit, 660 nit, the center brightness (the eighth value, 600 nit) is selected as the base value. The first sub-compensation value offset1 for the first preset point is 600 / 530, and so on. Ten test panels are selected, and ten sets of offset values ​​are calculated. From these ten sets, one offset value that reflects the brightness uniformity of the ten panels is selected, resulting in the first compensation value (offset value), which is burned into the flash memory. The offset value can be fine-tuned based on the actual compensation effect. As shown in Figure 5, each preset point on the test panel corresponds to an offset value, namely offset1, offset2, offset3, ..., offset15.

[0065] Step S103: Based on the second target image of the display panel to be compensated, acquire multiple image data of the display panel to be compensated;

[0066] The aforementioned image data is obtained by taking a picture of the second target image of the display panel to be compensated.

[0067] Step S104: Based on the above image data, determine the second compensation value of the above display panel to be compensated;

[0068] The full grayscale range includes grayscale levels 0 to 255, and the target grayscale levels within the full grayscale range are all selected target grayscale levels. Images can be taken of each target grayscale level displayed on the display panel to collect brightness parameters. Based on the collected brightness parameters and the desired brightness parameters for Demura compensation, the Demura compensation coefficient is calculated. Alternatively, the collected brightness parameters can be processed to filter out Mura signals, removing extracted point-type Mura, line-type Mura, etc., to calculate the Demura compensation coefficient, and then display restoration is performed on the corresponding positions of point-type Mura, line-type Mura, etc. The Demura compensation coefficient can be used to participate in the Demura compensation calculation for any grayscale level on the display panel, thereby performing Demura compensation on the display of any grayscale level on the display panel. The Demura compensation coefficient can be a product coefficient or an offset, and is not limited here. The Demura compensation coefficient is the second compensation value mentioned above.

[0069] The specific implementation steps of step S104 are as follows:

[0070] Step S1041: Determine the mura value of the image data based on the brightness data of the image data. The brightness data includes at least one of the following: brightness value, grayscale value, and contrast.

[0071] Step S1042: Determine the second compensation value based on the mura value of the image data.

[0072] Specifically, the mura value refers to the uniformity difference appearing on a display screen, typically manifested as uneven brightness or color on the display surface. The mura value can be used to measure the quality and performance of a display, as well as to assess the stability and consistency of the display manufacturing process. Therefore, by testing the mura value of image data, the uniformity difference of the display panel can be characterized, thereby determining a second compensation value to compensate for the uniformity of the display panel.

[0073] Step S105: Based on the first compensation value and the second compensation value, determine the final compensation value of the display panel to be compensated, and use the final compensation value to compensate the display panel to be compensated.

[0074] As shown in Figures 6 and 7, in Figure 7, O represents the display panel to be compensated, A represents compensation image 1 storing the first compensation value, B represents compensation image 2 storing the second compensation value, and P represents the final display image of the display panel after compensation. As shown in Figure 6, the brightness change of the test panel when the VDC function is turned off is first measured by an instrument. The test panel and the display panel to be compensated are the same display panel. Then, the brightness change of the test panel when the VDC function is turned off is converted into a compensation value change using a formula to obtain the first compensation value. The first compensation value is put into the algorithm to generate brightness compensation image 1 (as shown in A in Figure 7). Simultaneously, the display panel to be compensated is photographed to generate mura compensation image 2 including the second compensation value (as shown in B in Figure 7). The data of compensation image 1 and compensation image 2 are generated into a binary file directory, and the binary file directory including the first compensation value and the second compensation value is burned into the computer. Finally, the binary file directory is used to compensate the brightness and mura of the display panel to be compensated, resulting in the final display image shown in P in Figure 7.

[0075] First, the first compensation value and the second compensation value are used to compensate the display panel to be compensated, in order to check whether the first compensation value and the second compensation value meet the compensation requirements of the display panel to be compensated. After the first compensation value and the second compensation value are used to compensate the display panel to be compensated, a preliminary effect test is performed on the compensated display panel. If the effect of the display panel after preliminary compensation does not reach the predetermined effect (i.e., the brightness of the display panel does not reach the preset brightness), the corresponding first gain coefficient and second gain coefficient are added to the first compensation value and the second compensation value to obtain the third compensation value and the fourth compensation value, so as to increase the compensation range of the display panel to be compensated, and the third compensation value and the fourth compensation value are used to compensate the display panel to be compensated.

[0076] The process of determining the final compensation value for the display panel to be compensated based on the first compensation value and the second compensation value, and then using the final compensation value to compensate the display panel to be compensated, includes the following steps:

[0077] Step S301: Obtain a first gain coefficient and a second gain coefficient. The first gain coefficient is used to amplify or reduce the first compensation value, and the second gain coefficient is used to amplify or reduce the second compensation value.

[0078] The aforementioned display panel to be compensated includes multiple specific DBV values ​​and multiple specific gray levels. Each specific gray level under each specific DBV value corresponds to a first gain coefficient and a second gain coefficient. Obtaining the first gain coefficient and the second gain coefficient includes the following steps:

[0079] Step S3011: Based on the image of the display panel to be compensated, obtain the target DBV value and target grayscale of the display panel to be compensated;

[0080] Display panels typically have multiple preset Display Brightness Values ​​(DBVs) for adjusting screen brightness. Different brightness levels can be matched to the display panel in different application environments to provide a better user experience. For example, in brightly lit environments, the display brightness can be increased to ensure the user can clearly see the content displayed on the panel, while in dimly lit environments, the display brightness can be decreased to avoid eye strain caused by a large difference between ambient light and the display panel's brightness. Common grayscale nodes on a display panel refer to the different gray levels the monitor can display. Generally, a display panel has 255 grayscale nodes.

[0081] Therefore, each displayed image on the display panel corresponds to a DBV value and a grayscale level. Based on the image currently displayed on the display panel to be compensated, the corresponding DBV value and grayscale level can be determined.

[0082] Step S3012: When the target DBV value is the specific DBV value and the target grayscale is the specific grayscale corresponding to the specific DBV value, retrieve the target DBV value and the corresponding first gain coefficient and second gain coefficient under the target grayscale.

[0083] Based on the display characteristics of the display panel, multiple specific DBV values ​​and corresponding target grayscale levels are pre-set, and a first gain coefficient and a second gain coefficient are set for each specific DBV value and target grayscale level. Taking a scenario with 6 specific DBV values ​​and 5 target grayscale levels as an example, the set first gain coefficients are shown in Table 1:

[0084] Table 1. Relationship between DBV value, target gray level, and first gain coefficient

[0085] As shown in Table 1, gain1 is the first gain coefficient corresponding to a specific DBV value of DBV1 and a target grayscale of GRAY 1. gain2, ..., gain30 are the first gain coefficients corresponding to different DBV values ​​and target grayscales. Similarly, a similar correspondence table as shown in Table 1 is also set for the second gain coefficient, which will not be elaborated here.

[0086] That is, two sets of gain values ​​are preset. One set of gain values ​​is the corresponding value of the first gain coefficient under different DBV values ​​and target gray levels, and the other set of gain values ​​is the corresponding value of the second gain coefficient under different DBV values ​​and target gray levels.

[0087] Step S3013: If at least one of the target DBV value or the target gray level is not a specific value, determine the first gain coefficient and the second gain coefficient based on linear interpolation.

[0088] Specifically, if the DBV value and grayscale corresponding to the image currently displayed on the display panel to be compensated are not any set of values ​​in the gain coefficient correspondence table, then the first gain coefficient and the second gain coefficient can be determined based on the target DBV value and the above-mentioned target grayscale using the linear interpolation method, and the accurate first gain coefficient and the second gain coefficient can also be obtained.

[0089] In another embodiment, the grayscale value to be compensated for the aforementioned display panel is x. When x ≤ 128, the aforementioned first gain coefficient is 0; when x > 128, the aforementioned first gain coefficient is greater than 0. It should be noted that the larger the grayscale value of the display panel, the larger the brightness value of the display panel, and the corresponding larger the current and voltage drop. Therefore, the larger the grayscale value of the display panel, the more severe the unevenness of brightness between the positions near the IC end and the positions far from the IC end on the display area 110 will be. Conversely, the smaller the brightness grayscale value of the display panel, the smaller the impact of the voltage drop on the brightness uniformity. Therefore, when the grayscale value is small, such as when the grayscale is not higher than 128, the first gain coefficient can be set to 0, that is, it is not necessary to compensate for the brightness uniformity value of the lower grayscale.

[0090] Step S302: The product of the first gain coefficient and the first compensation value is determined as the third compensation value;

[0091] Step S303: The product of the second gain coefficient and the second compensation value is determined as the fourth compensation value;

[0092] Step S304: Determine the final compensation value of the display panel to be compensated based on the third compensation value and the fourth compensation value, and use the final compensation value to compensate the display panel to be compensated.

[0093] Specifically, the first compensation value is obtained by detecting the test panel, and the second compensation value is obtained based on the mura value of the panel to be compensated. The compensation range of the panel to be compensated using the first and second compensation values ​​is relatively small and may not meet the image requirements of the panel to be compensated. Therefore, the first gain coefficient and the second gain coefficient are added to obtain the third and fourth compensation values, which can increase the compensation range of the panel to be compensated and better meet the image requirements of the panel to be compensated.

[0094] The process of determining the final compensation value for the display panel to be compensated based on the third and fourth compensation values, and then using the final compensation value to compensate the display panel, includes the following steps:

[0095] Step S401: The above-mentioned final compensation value is used to compensate the above-mentioned display panel to be compensated, so as to obtain the initial compensation panel.

[0096] Step S402: Obtain the brightness uniformity value and mura value of the initial compensation panel.

[0097] Step S403: If the display effect of the initial compensation panel does not meet the preset display effect, adjust the size of the third compensation value and / or the size of the fourth compensation value to perform secondary compensation on the initial compensation panel.

[0098] The display effect of the initial compensation panel is reflected by the brightness uniformity value and mura value of the initial compensation panel. That is, if both the brightness uniformity value and mura value of the initial compensation panel are within the target range, the display effect of the initial compensation panel is determined to meet the preset display effect. If at least one of the brightness uniformity value and mura value of the initial compensation panel is not within the target range, the display effect of the initial compensation panel is determined to not meet the preset display effect.

[0099] If the display effect of the initial compensation panel does not meet the preset display effect, it means that the third compensation value and the fourth compensation value still cannot meet the compensation requirements of the panel to be compensated. At this time, it is necessary to continue to increase the compensation range of the panel to be compensated. Therefore, it is necessary to adjust the size of the third compensation value and / or the size of the fourth compensation value to increase the compensation range of the panel to be compensated, thereby performing secondary compensation on the initial compensation panel.

[0100] If the display effect of the initial compensation panel does not meet the preset display effect, adjust the size of the third compensation value and / or the size of the fourth compensation value to perform secondary compensation on the initial compensation panel, including: if the brightness uniformity value of the initial compensation panel does not meet the preset brightness uniformity value range, adjust the size of the first gain coefficient and / or adjust the size of the second gain coefficient to perform secondary compensation on the initial compensation panel.

[0101] Specifically, if the brightness uniformity value of the initial compensation panel does not meet the preset brightness uniformity value range, it indicates that the display effect of the initial compensation panel does not meet the preset display effect. In this case, it is necessary to adjust the magnitude of the third compensation value and / or the fourth compensation value to increase the compensation range of the panel to be compensated, thereby performing secondary compensation on the initial compensation panel. However, the first compensation value is obtained based on the test experiment of the test panel, and the second compensation value is obtained based on the mura value of the display panel to be compensated. That is, the first and second compensation values ​​are specific compensation values ​​obtained based on the performance of the display panel and cannot be arbitrarily adjusted. Therefore, the third and fourth compensation values ​​can only be adjusted by adjusting the first and second gain coefficients. In some instances, the third and fourth compensation values ​​can be adjusted accordingly by adjusting only the first gain coefficient, adjusting only the second gain coefficient, or adjusting both the first and second gain coefficients, thereby increasing the compensation range of the panel to be compensated.

[0102] After obtaining the brightness uniformity value and mura value of the initial compensation panel, the above method further includes:

[0103] If the brightness uniformity value of the initial compensation panel is greater than the preset brightness uniformity value range, it is determined that the initial compensation panel is in an overcompensated state. If the initial compensation panel is in an overcompensated state, it means that the compensation of the initial compensation panel is too large, resulting in excessive brightness. Therefore, it is necessary to adjust the third compensation value and the fourth compensation value.

[0104] That is, when the initial compensation panel is in the overcompensated state, the first gain coefficient is reduced, and / or the second gain coefficient is reduced; thereby reducing the third compensation value, and / or the fourth compensation value.

[0105] If the brightness uniformity value of the initial compensation panel is less than the preset brightness uniformity value range, the initial compensation panel is determined to be undercompensated. An undercompensated initial compensation panel indicates that the initial compensation is too small, resulting in low brightness; therefore, the third and fourth compensation values ​​need to be increased.

[0106] That is, when the initial compensation panel is in the aforementioned undercompensated state, the first gain coefficient is increased, and / or the second gain coefficient is increased. This, in turn, increases the third compensation value, and / or the fourth compensation value.

[0107] The process of adjusting the third compensation value and / or the fourth compensation value to perform secondary compensation on the initial compensation panel when the initial compensation panel's display effect does not meet the preset display effect includes the following steps:

[0108] Step S501: Obtain a first multiplier and a second multiplier. The first multiplier is used to amplify or reduce the third compensation value, and the second multiplier is used to amplify or reduce the fourth compensation value.

[0109] Step S502: The product of the first multiple and the third compensation value is determined as the fifth compensation value;

[0110] Step S503: The product of the second multiple and the fourth compensation value is determined as the sixth compensation value;

[0111] Since the gain value (i.e., the first gain coefficient and the second gain coefficient) also has a certain range, in some cases, the compensation range of the panel to be compensated using the third compensation value and the fourth compensation value may not be able to meet the image requirements of the panel to be compensated. Therefore, by adding the first multiplier and the second multiplier, the fifth compensation value and the sixth compensation value are obtained, which can further increase the compensation range of the panel to be compensated and better meet the image requirements of the panel to be compensated.

[0112] Step S504: When the initial compensation panel is in the overcompensated state, reduce the first multiplier and / or reduce the second multiplier. When the initial compensation panel is in the overcompensated state, it indicates that the compensation of the initial compensation panel is too large, resulting in excessive brightness. Therefore, it is necessary to reduce the third compensation value and the fourth compensation value. Therefore, by reducing the first multiplier and / or reducing the second multiplier, the third compensation value is reduced and / or the fourth compensation value is reduced, thereby meeting the compensation requirements of the display panel to be compensated.

[0113] Step S505: If the initial compensation panel is in the undercompensated state, increase the first multiplier and / or increase the second multiplier. When the initial compensation panel is in the undercompensated state, it indicates that the initial compensation is too small, resulting in low brightness. Therefore, it is necessary to increase the third and fourth compensation values. Thus, by increasing the first multiplier and / or increasing the second multiplier, the third compensation value and / or the fourth compensation value are increased, thereby meeting the compensation requirements of the display panel to be compensated.

[0114] The process of using the aforementioned final compensation value to compensate the aforementioned display panel to be compensated includes the following steps:

[0115] Step S601: Determine the target display brightness and target grayscale corresponding to each display area of ​​the above-mentioned display panel to be compensated;

[0116] Step S602: Determine the target data signal of the target pixel circuit corresponding to the above display area based on the above target grayscale and gamma curve.

[0117] Step S603: The target data signal is input to the target pixel circuit to drive the target pixel circuit so that each display area of ​​the display panel to be compensated displays the corresponding target display brightness.

[0118] As shown in the steps above, in some embodiments, the display area of ​​the display panel can be divided into two or more display regions, each arranged from the near IC end to the far IC end on the display panel, or arranged from the far IC end to the near IC end on the display panel. Each display region corresponds to a display brightness and grayscale. Based on the grayscale and gamma curves, the target data signal of the target pixel circuit corresponding to the region can be determined, thereby enabling the pixel circuit driving the display of that region to operate.

[0119] The method of using the final compensation value to compensate the display panel to be compensated includes: writing the final compensation value into the driver integrated circuit so that the driver integrated circuit reads the final compensation value to compensate the display effect of the display panel to be compensated, wherein the first compensation value is used to compensate the brightness uniformity of the display panel to be compensated, and the second compensation value is used to compensate at least the mura of the display panel to be compensated.

[0120] In the display panel, each row of display area corresponds to a driving circuit to drive the display. The final compensation value is written into the driving integrated circuit. The driving signal of the corresponding driving circuit in the driving integrated circuit is determined according to the final compensation value of each display area in order to compensate the display area.

[0121] The above-mentioned compensation method for the display panel in this application firstly uses multiple test panels to display a first target image, and determines a first compensation value for the display panel to be compensated based on the brightness values ​​of multiple preset points on each test panel. Then, it determines a second compensation value for the display panel to be compensated through a second target image of the display panel to be compensated. Based on the first compensation value and the second compensation value, it determines a final compensation value for the display panel to be compensated, and uses the final compensation value to compensate the display panel to be compensated. This method calculates a first compensation value (offset compensation value) by testing the test panel, determines a second compensation value (mura compensation value) by using a second target image of the display panel to be compensated, and generates a brightness compensation map using an algorithm based on the first and second compensation values. The display panel is compensated using these two compensation values, improving the brightness uniformity of the display panel. This eliminates the need to enable voltage attenuation compensation (VDC ON) for brightness compensation, thus avoiding the problem of deteriorated brightness uniformity caused by turning off VDC (VDC OFF) when the brightness of the first frame of a low-brightness, high-contrast (LHBM) image is noticeably flickering. In other words, it solves the problem of uneven panel brightness when VDC OFF is used in related technologies.

[0122] In some examples, a comparison of the average brightness before and after demura was obtained using a five-axis 135-point test, as shown in Table 2. In Table 2, LU-Demura on represents the brightness average after compensation of the display panel O using the scheme of this embodiment, as shown in Compensation Chart 1 (storing the first compensation value) and Compensation Chart 2 (storing the second compensation value) as shown in Figure 7. In Table 2, LU-Demura off represents the brightness average after compensation of the display panel O using related technologies. It can be clearly seen that the brightness average of the display panel O is significantly improved after compensation using the technology of this embodiment.

[0123] Table 2. Comparison of compensation effects between this embodiment and related technologies

[0124] This embodiment also provides a compensation method for a display panel, as shown in Figure 8. The method includes the following steps:

[0125] Step S701: Prepare multiple test panels and perform brightness tests on each of the test panels to obtain the brightness values ​​of multiple test points on the test panels;

[0126] Step S702: Use an image acquisition device to acquire an image of the display panel to be compensated, and obtain the image data of the display panel to be compensated.

[0127] Step S703: The processing device determines the final compensation value of the display panel to be compensated based on the first compensation value and the second compensation value, and writes the final compensation value into the driver integrated circuit so that the driver integrated circuit reads the final compensation value to compensate the display panel to be compensated. The first compensation value is determined based on the brightness values ​​of all the test points, and the second compensation value is extracted from the image data.

[0128] The above-described display panel compensation method of this application first performs brightness tests on each test panel to obtain brightness values ​​at multiple test points on the test panel; then, an image acquisition device is used to acquire images of the display panel to be compensated to obtain image data of the display panel to be compensated; finally, a processing device is used to determine the final compensation value of the display panel to be compensated based on a first compensation value and a second compensation value. This method calculates a first compensation value (i.e., offset compensation value) by testing the test panel, determines a second compensation value (i.e., mura compensation value) by using a second target image of the display panel to be compensated, and generates a brightness compensation map using an algorithm based on the first and second compensation values. By compensating the display panel with these two compensation values, the brightness uniformity of the display panel is improved, and mura defects are also mitigated. This eliminates the need to enable voltage attenuation compensation (VDC ON) for brightness compensation of the display panel, thus avoiding the problem of deteriorated brightness uniformity caused by turning off VDC (VDC OFF) when entering a low-brightness, high-contrast (LHBM) scene where the brightness of the first frame of the image exhibits obvious flicker. This solves the problem of uneven panel brightness when VDC OFF in related technologies.

[0129] In this embodiment, a display panel is also provided, as shown in FIG1. ​​The display panel 100 includes a display area 110, and the display brightness of the display panel 100 is determined by any of the above-mentioned display panel compensation methods.

[0130] The display brightness of the display panel described in this application is determined using any of the aforementioned display panel compensation methods. A brightness compensation map is generated using an algorithm based on the first and second compensation values. The display panel is compensated using these two compensation values, improving its brightness uniformity. This eliminates the need to enable voltage attenuation compensation (VDC ON) for brightness compensation, thus avoiding the problem of deteriorated brightness uniformity caused by switching VDC ON to VDC OFF when the brightness of the first frame of a low-brightness, high-contrast (LHBM) image is noticeably flickering. This solves the problem of uneven panel brightness when VDC OFF is used in related technologies.

[0131] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0132] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0133] 1) The above-mentioned compensation method for the display panel of this application firstly uses multiple test panels to display a first target image, and determines a first compensation value of the display panel to be compensated based on the brightness values ​​of multiple preset points on each test panel. Then, it determines a second compensation value of the display panel to be compensated through a second target image of the display panel to be compensated. Based on the first compensation value and the second compensation value, it determines a final compensation value of the display panel to be compensated, and uses the final compensation value to compensate the display panel to be compensated. This method calculates a first compensation value (offset compensation value) by testing the test panel, determines a second compensation value (mura compensation value) by using a second target image of the display panel to be compensated, and generates a brightness compensation map using an algorithm based on the first and second compensation values. The display panel is compensated using these two compensation values, improving the brightness uniformity of the display panel. This eliminates the need to enable voltage attenuation compensation (VDC ON) for brightness compensation, thus avoiding the problem of deteriorated brightness uniformity caused by turning off VDC (VDC OFF) when the brightness of the first frame of a low-brightness, high-contrast (LHBM) image is noticeably flickering. In other words, it solves the problem of uneven panel brightness when VDC OFF is used in related technologies.

[0134] 2) The above-mentioned compensation method for the display panel in this application firstly performs brightness tests on each test panel to obtain brightness values ​​at multiple test points on the test panel; then, an image acquisition device is used to acquire images of the display panel to be compensated to obtain image data of the display panel to be compensated; finally, a processing device is used to determine the final compensation value of the display panel to be compensated based on the first compensation value and the second compensation value. This method calculates the first compensation value (i.e., the offset compensation value) by testing the test panel, determines the second compensation value (i.e., the mura compensation value) by using the second target image of the display panel to be compensated, generates a brightness compensation map using the first and second compensation values, and compensates the display panel with the two compensation values ​​to improve the brightness uniformity of the display panel. It eliminates the need to enable the voltage attenuation compensation function (VDC ON) for brightness compensation of the display panel, thus avoiding the problem of brightness uniformity deterioration caused by turning off VDC (i.e., converting VDC ON to VDC OFF) when entering a low brightness high contrast (LHBM) image, which results in obvious flickering in the first frame of the image. This solves the problem of uneven panel brightness when VDC OFF in related technologies.

[0135] 3) The display brightness of the display panel described in this application is determined using any of the aforementioned display panel compensation methods. A brightness compensation map is generated using an algorithm based on the first and second compensation values. The display panel is compensated using these two compensation values, improving its brightness uniformity. This eliminates the need to enable voltage attenuation compensation (VDC ON) for brightness compensation, thus avoiding the problem of deteriorated brightness uniformity caused by switching VDC ON to VDC OFF when the brightness of the first frame of a low-brightness, high-contrast (LHBM) image is noticeably flickering. This solves the problem of uneven panel brightness when VDC OFF in related technologies.

[0136] The above description is merely an optional embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A compensation method of a display panel, comprising: obtaining, based on a first target image of a plurality of test panels, luminance values corresponding to m preset points of the plurality of test panels respectively; determining, based on the luminance values corresponding to the m preset points of the plurality of test panels respectively, a first compensation value of a display panel to be compensated; obtaining, based on a second target image of the display panel to be compensated, a plurality of image data of the display panel to be compensated; determining, based on the image data, a second compensation value of the display panel to be compensated; determining, based on the first compensation value and the second compensation value, a final compensation value of the display panel to be compensated, and compensating the display panel to be compensated by using the final compensation value.

2. The compensation method of claim 1, wherein, The first compensation value comprises a plurality of first sub-compensation values, and each of the i-th preset point of the test panel has a corresponding first sub-compensation value, where i≤m, and i and m are positive integers greater than 0.

3. The compensation method of claim 2, wherein, The first sub-compensation values of at least two different preset points are different.

4. The compensation method of claim 2, wherein, The method comprises: determining, based on the luminance values corresponding to the m preset points respectively, the first sub-compensation value corresponding to each preset point; determining, based on all the first sub-compensation values of the test panels, the first sub-compensation value of the display panel to be compensated.

5. The compensation method of claim 4, wherein, The method comprises: turning on the first target image of the test panel, and obtaining the luminance values of the m preset points under the first target image; determining the j-th preset point as a reference point of the test panel, determining the luminance value of the j-th preset point of the test panel as a reference luminance value, and determining the luminance value of the i-th preset point of the display panel to be compensated as a test luminance value, where j≤m, and j is a positive integer greater than 0; determining the ratio of the test luminance value to the reference luminance value as the first sub-compensation value.

6. The compensation method of claim 5, wherein, The j-th preset point is the center position of the display area of the test panel.

7. The compensation method of claim 4, wherein, The method comprises: removing the first sub-compensation value with the lowest value and the first sub-compensation value with the highest value from all the first sub-compensation values of the test panels to obtain a target initial set; determining the average value of all the first sub-compensation values in the target initial set as the first sub-compensation value.

8. The compensation method of claim 4, wherein, The method comprises: determining the median of all the first sub-compensation values as the first sub-compensation value of the display panel to be compensated.

9. The compensation method of claim 2, wherein, The test panels at least comprise a first preset test panel and a second preset test panel, and the first sub-compensation values of the first preset test panel and the second preset test panel are different. 10.The compensation method of claim 2, wherein The plurality of preset point positions on the test panel are arranged according to a preset arrangement rule, the preset arrangement rule being a rule of arranging the plurality of preset point positions from an IC end close to the test panel to an IC end far from the test panel, or a rule of arranging the plurality of preset point positions from an IC end far from the test panel to an IC end close to the test panel, and / or, The preset point positions on the test panel are arranged at equal intervals or at unequal intervals.

11. The compensation method of claim 1, wherein, Based on the image data, a second compensation value of the display panel to be compensated is determined, including: According to luminance data of the image data, a mura value of the image data is determined, the luminance data including at least one of a luminance value, a grayscale value, and a contrast ratio; According to the mura value of the image data, the second compensation value is determined.

12. The compensation method of claim 1, wherein, The final compensation value is used to compensate the display panel to be compensated, including: The final compensation value is written into a driving integrated circuit, so that the driving integrated circuit reads the final compensation value to compensate a display effect of the display panel to be compensated, wherein the first compensation value is used to compensate a luminance uniformity of the display panel to be compensated, and the second compensation value is used to compensate at least a mura of the display panel to be compensated.

13. The compensation method of claim 1, wherein, Based on the first compensation value and the second compensation value, a final compensation value of the display panel to be compensated is determined, and the final compensation value is used to compensate the display panel to be compensated, including: A first gain coefficient and a second gain coefficient are obtained, the first gain coefficient being used to amplify or reduce the first compensation value, and the second gain coefficient being used to amplify or reduce the second compensation value; A product of the first gain coefficient and the first compensation value is determined as a third compensation value; A product of the second gain coefficient and the second compensation value is determined as a fourth compensation value; The final compensation value of the display panel to be compensated is determined according to the third compensation value and the fourth compensation value, and the final compensation value is used to compensate the display panel to be compensated.

14. The compensation method of claim 13, wherein, The display panel to be compensated includes a plurality of specific DBV values and a plurality of specific gray scales, each specific gray scale corresponding to a first gain coefficient and a second gain coefficient under each specific DBV value, and the first gain coefficient and the second gain coefficient are obtained, including: Based on an image of the display panel to be compensated, a target DBV value and a target gray scale of the display panel to be compensated are obtained; In a case where the target DBV value is the specific DBV value and the target gray scale is the corresponding specific gray scale under the specific DBV value, the corresponding first gain coefficient and the second gain coefficient under the target DBV value and the target gray scale are called; In a case where at least one of the target DBV value or the target gray scale is not the corresponding specific value, the first gain coefficient and the second gain coefficient are determined based on a linear interpolation method.

15. The compensation method of claim 13, wherein, When a gray scale to be compensated of the display panel to be compensated is x, the first gain coefficient is 0 when x is less than or equal to 128, and the first gain coefficient is greater than 0 when x is greater than 128.

16. The compensation method of claim 13, wherein, The final compensation value of the display panel to be compensated is determined according to the third compensation value and the fourth compensation value, and the final compensation value is used to compensate the display panel to be compensated, including: The display panel to be compensated is compensated by using the final compensation value, and an initial compensation panel is obtained; A brightness uniformity value and a mura value of the initial compensation panel are obtained; In a case where the display effect of the initial compensation panel does not meet a preset display effect, the size of the third compensation value and / or the size of the fourth compensation value are adjusted to perform secondary compensation on the initial compensation panel.

17. The compensation method of claim 16, wherein, In a case where the display effect of the initial compensation panel does not meet a preset display effect, In a case where the brightness uniformity value of the initial compensation panel does not meet a preset brightness uniformity value range, the size of the first gain coefficient is adjusted, and / or the size of the second gain coefficient is adjusted to perform secondary compensation on the initial compensation panel.

18. The compensation method of claim 16, wherein, After the brightness uniformity value and the mura value of the initial compensation panel are obtained, the method further includes: In a case where the brightness uniformity value of the initial compensation panel is greater than a preset brightness uniformity value range, it is determined that the initial compensation panel is in an over-compensation state; In a case where the brightness uniformity value of the initial compensation panel is less than the preset brightness uniformity value range, it is determined that the initial compensation panel is in an under-compensation state.

19. The compensation method of claim 18, wherein, In a case where the initial compensation panel is in the over-compensation state, the first gain coefficient is decreased, and / or the second gain coefficient is decreased; In a case where the initial compensation panel is in the under-compensation state, the first gain coefficient is increased, and / or the second gain coefficient is increased.

20. The compensation method of claim 18, wherein, The adjusting the size of the third compensation value and / or the size of the fourth compensation value to perform secondary compensation on the initial compensation panel in a case where the display effect of the initial compensation panel does not meet a preset display effect includes: A first multiple and a second multiple are obtained, the first multiple is used to amplify or reduce the third compensation value, and the second multiple is used to amplify or reduce the fourth compensation value; A product of the first multiple and the third compensation value is determined as a fifth compensation value; A product of the second multiple and the fourth compensation value is determined as a sixth compensation value; In a case where the initial compensation panel is in the over-compensation state, the first multiple is decreased, and / or the second multiple is decreased; In a case where the initial compensation panel is in the under-compensation state, first multiple is increased, and / or the second multiple is increased.

21. The compensation method of claim 1, wherein, The final compensation value is used to compensate the display panel to be compensated, including: A target display brightness and a target gray scale corresponding to each display area of the display panel to be compensated are determined; According to the target gray scale and a gamma curve, a target data signal of a target pixel circuit corresponding to the display area is determined; inputting the target data signal into the target pixel circuit to drive the target pixel circuit, so that each display area of the display panel to be compensated displays a corresponding target display brightness.

22. The compensation method of claim 1, wherein, The first target picture includes a regular brightness of 255 gray scales.

23. A compensation method of a display panel, comprising: preparing a plurality of test panels, and performing brightness test on each of the test panels to obtain brightness values of a plurality of test points on the test panels; performing image acquisition on a display panel to be compensated by using an image acquisition device to obtain image data of the display panel to be compensated; determining a final compensation value of the display panel to be compensated according to a first compensation value and a second compensation value by using a processing device, and writing the final compensation value into a driving integrated circuit, so that the driving integrated circuit reads the final compensation value to compensate the display panel to be compensated, wherein the first compensation value is determined according to brightness values of all the test points, and the second compensation value is extracted from the image data.

24. A display panel, a display brightness of the display panel being determined by using the compensation method of the display panel according to any one of claims 1 to 23.

Images