Display demura method for display panel, and display panel and display device

Abstract

A display demura method for a display panel, and a display panel and a display device. The method comprises: acquiring a display demura value of an image to be displayed on a display panel (S110); determining a grayscale characteristic parameter on the basis of the display demura value (S120); on the basis of the grayscale characteristic parameter, searching a lookup table of grayscale characteristic parameters and gain parameters to determine a gain parameter value corresponding to the grayscale characteristic parameter (S130); and performing display demura on the display image of the display panel on the basis of the display demura value and the gain parameter value, wherein the lookup table of grayscale characteristic parameters and gain parameters is pre-stored in the display panel (S140).

Description

Methods for compensating for uneven display in display panels, display panels and display devices

[0001] This application claims priority to Chinese Patent Application No. 202411901089.9, filed with the Chinese Patent Office on December 20, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to display technology, such as a method for compensating for uneven display in a display panel, a display panel, and a display device. Background Technology

[0003] Due to variations in materials and processes during the manufacturing of display panels, differences in light-emitting elements can occur, resulting in a display unevenness (mura) phenomenon. To improve the display effect, display unevenness compensation (Demura) technology is usually used to compensate for the brightness differences between pixels.

[0004] The current Demura solution employs a combined compensation method using display unevenness compensation values ​​and compensation gain parameters. The product of these two values ​​is the grayscale brightness adjustment value for the Mura area. By lowering the grayscale brightness of bright Mura areas and increasing the grayscale brightness of dark Mura areas, the overall brightness of the display is made consistent. However, heavier Mura areas require raising or lowering more grayscale levels, and since the display unevenness compensation data for each display panel is fixed, compensating for heavier Mura areas requires increasing the compensation gain parameter. But a larger compensation gain parameter can lead to overcompensation for lighter Mura areas. Summary of the Invention

[0005] This application provides a method for compensating for uneven display in a display panel, a display panel, and a display device. By improving the relevant Demura technology, the uneven display in a display panel is enhanced.

[0006] In a first aspect, embodiments of this application provide a method for compensating for uneven display on a display panel, including:

[0007] Obtain the display unevenness compensation value of the image to be displayed on the display panel;

[0008] Based on the aforementioned unevenness compensation value, determine the grayscale feature parameters;

[0009] Based on the grayscale feature parameters, look up the grayscale feature parameter and gain parameter lookup table to determine the gain parameter value corresponding to the grayscale feature parameters;

[0010] Based on the display unevenness compensation value and the gain parameter value, the display screen of the display panel is compensated for display unevenness.

[0011] The grayscale feature parameter and gain parameter lookup table is pre-stored in the display panel.

[0012] Secondly, embodiments of this application also provide a display panel, wherein the display panel employs the display unevenness compensation method described in the first aspect to improve display uniformity during display.

[0013] Thirdly, embodiments of this application also provide a display device, including the display panel and driver chip described in the second aspect. Attached Figure Description

[0014] Figure 1 is a schematic diagram comparing the display panel of a regular Mura before and after compensation;

[0015] Figure 2 is a schematic diagram showing the comparison of the display panel before and after compensation for severe Mura.

[0016] Figure 3 is a schematic diagram comparing the display panel compensation before and after the lighter Mura;

[0017] Figure 4 is a schematic diagram of the structure of a display panel provided in an embodiment of this application;

[0018] Figure 5 is a flowchart illustrating a method for compensating for uneven display of a display panel according to an embodiment of this application;

[0019] Figure 6 is a schematic diagram of a process for obtaining display unevenness compensation value according to an embodiment of this application;

[0020] Figure 7 is a flowchart illustrating a method for determining the unevenness compensation value according to an embodiment of this application;

[0021] Figure 8 is a flowchart illustrating a method for determining grayscale feature parameters according to an embodiment of this application;

[0022] Figure 9 is a flowchart illustrating another method for compensating for uneven display of a display panel provided in an embodiment of this application;

[0023] Figure 10 is a flowchart illustrating a calibration table of grayscale feature parameters and gain parameters provided in an embodiment of this application.

[0024] Figure 11 is a flowchart illustrating another method for compensating for uneven display of a display panel provided in an embodiment of this application;

[0025] Figure 12 is a schematic diagram of another display panel provided in an embodiment of this application;

[0026] Figure 13 is a schematic diagram of another display panel provided in an embodiment of this application;

[0027] Figure 14 is a schematic diagram of another display panel provided in an embodiment of this application;

[0028] Figure 15 is a schematic diagram of the structure of another display panel provided in an embodiment of this application;

[0029] Figure 16 is a structural schematic diagram of another display panel provided in this application;

[0030] Figure 17 is a partially enlarged schematic diagram of the display panel in area M of Figure 16;

[0031] Figure 18 is a schematic diagram of the structure of a display device provided in an embodiment of this application. Detailed Implementation

[0032] The present application will now be described in conjunction with the accompanying drawings and embodiments. The embodiments described herein are for the purpose of explaining the present application. For ease of description, the accompanying drawings show some structures related to the present application.

[0033] The terminology used in the embodiments of this application is for the purpose of describing specific embodiments and is not intended to limit the application. The directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings. Furthermore, in the context of an element being formed "upper" or "lower" of another element, it can be formed not only directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the meaning of the above terms in this application as appropriate.

[0034] The relevant Demura technology typically includes the following steps: First, the display panel is set up on the Demura station machine, and the display panel is controlled to display a preset test screen. An industrial camera is used to take pictures of the display panel to obtain brightness data at different positions on the display panel. Then, the Demura algorithm is called to calculate compensation data. The compensation data is processed into a binary (bin) or hexadecimal (hex) format file and burned into the external flash memory chip (Flash Integrated Circuit, Flash IC) of the main flexible printed circuit board (FPC) of the display panel module. When Demura is working, the compensation data is loaded into the memory of the display driver integrated circuit (DDIC). Combined with the display unevenness gain parameter value (Gain), the product of the two is used as the grayscale brightness adjustment value of the Mura area. By lowering the grayscale brightness of the bright Mura area and increasing the grayscale brightness of the dark Mura area, the overall brightness of the display panel is made uniform.

[0035] In the current compensation scheme, all display panels from the same batch are compensated using the same set of compensation parameters. This same set of parameters only provides good compensation for display panels with normal mura; it is less effective for panels with severe mura or mild mura. For panels with severe mura, undercompensation occurs; for panels with mild mura, overcompensation occurs. For example, Figure 1 shows a comparison of a normal mura display panel before and after compensation, with the left image showing before compensation and the right image showing after compensation. The compensation significantly improves the display uniformity of the normal mura display panel compared to before. Figure 2 shows a comparison of a severely mura display panel before and after compensation, with the left image showing before compensation and the right image showing after compensation. Due to insufficient compensation, uneven display still exists after compensation for severely mura display panels. Figure 3 shows a comparison of a panel with milder mura display panels before and after compensation, with the left image showing before compensation and the right image showing after compensation. Due to overcompensation, the compensation results in even more severe uneven display.

[0036] To address the aforementioned issues, this application provides a method for compensating for uneven display in a display panel. This method first obtains the uneven display compensation value of the image to be displayed on the display panel; then, based on the uneven display compensation value, it determines grayscale feature parameters; next, based on the grayscale feature parameters, it looks up a grayscale feature parameter and gain parameter lookup table to determine the gain parameter value corresponding to the grayscale feature parameters; and finally, based on the uneven display compensation value and the gain parameter value, it performs uneven display compensation on the image displayed on the display panel. The grayscale feature parameter and gain parameter lookup table is pre-stored in the display panel.

[0037] By adopting the above technical solution, grayscale characteristic parameters are calculated by designing a method for calculating display non-uniformity compensation values. These grayscale characteristic parameters are used to measure the degree of mura of different display panels in the same batch. Corresponding gain parameters are used to compensate for different degrees of mura, which can improve the accuracy of demura compensation and enhance the display quality of the display panel.

[0038] The embodiments of this application will now be described with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0039] Figure 4 is a schematic diagram of a display panel provided in an embodiment of this application. Referring to Figure 4, this application provides a display panel in which, when displaying content, any of the display unevenness compensation methods provided in this application can be used to improve display uniformity.

[0040] For example, referring to FIG4, the display panel 10 may include an organic light-emitting diode (OLED) display panel, an active-matrix organic light-emitting diode (AMOLED) display panel, a quantum dot light-emitting diode (QLED) display panel, a light-emitting diode (LED) display panel, a micro light-emitting diode (Micro LED) display panel, a submillimeter light-emitting diode (Mini LED) display panel, etc. The embodiments of this application do not limit the type of display panel 10.

[0041] The display panel 10 includes a display area AA and a non-display area NA. Multiple sub-pixels 20 are disposed within the display area AA, which is used to display images. The non-display area NA is provided with structures such as a source drive circuit and a gate drive circuit. For example, only three sub-pixels 20 are shown in Figure 4; other sub-pixels 20 are not shown here.

[0042] The display panel 10 provided in this application embodiment also includes other film layer areas below the display area AA, such as a substrate and a sub-pixel driving circuit layer. The sub-pixel driving circuit can be a 2T1C ("2T" represents 2 transistors, "1C" represents 1 capacitor), 4T1C, 7T1C, 7T2C, 8T1C, 8T2C, etc. The sub-pixel driving circuit includes multiple thin film transistors (TFTs), storage capacitors, and metal traces, etc., to provide driving current to the sub-pixel 20 to drive the sub-pixel 20 to emit light. The film layer structures of the sub-pixel driving circuit are not shown one by one in this application embodiment.

[0043] Figure 5 is a flowchart illustrating a display panel unevenness compensation method provided in an embodiment of this application. Referring to Figure 5, the display panel unevenness compensation method provided in this embodiment includes:

[0044] S110. Obtain the display unevenness compensation value of the screen to be displayed on the display panel.

[0045] For display panels from the same batch, the display unevenness compensation value of each display screen can be tested experimentally. For each display screen, there are multiple display unevenness compensation values. For example, in one embodiment, one sub-pixel can be set to correspond to one display unevenness compensation value; in another embodiment, one pixel area can be set to correspond to one display unevenness compensation value (this compensation value can be understood as the average value of that area). It is understood that the more display unevenness compensation values ​​there are, the better the compensation effect, but it may occupy more storage space. The specific implementation can be set according to the actual situation. Then, the display unevenness compensation value is written into the storage unit of the display panel in a specific format (e.g., hexadecimal data). Optionally, the display panel includes a storage unit. Figure 6 is a schematic flowchart of obtaining display unevenness compensation values ​​provided by an embodiment of this application. Referring to Figure 6, obtaining the display unevenness compensation value of the screen to be displayed on the display panel includes:

[0046] S111. Obtain the display unevenness compensation data stored in the storage unit.

[0047] The display panel's storage unit can be flash memory, which can store display unevenness compensation data using preset storage methods, such as binary, hexadecimal, etc. Different data storage results in different display unevenness compensation values.

[0048] S112. Decompress the display unevenness compensation data to obtain the display unevenness compensation value.

[0049] Since the display unevenness compensation data stored in the storage unit may not be the actual display unevenness compensation value, it is necessary to decompress the display unevenness compensation data and transmit it to the driver chip of the display panel, so that the driver chip can process the display unevenness compensation value.

[0050] Optionally, the display unevenness compensation value is the difference between the actual display brightness and the desired display brightness. Figure 7 is a flowchart illustrating a method for determining the display unevenness compensation value according to an embodiment of this application. Referring to Figure 7, the method for determining the display unevenness compensation value includes:

[0051] S1101, The control display panel displays the test screen.

[0052] When the display panel displays the test image, the sub-pixel driving circuit of the display panel provides driving current to the light-emitting elements of the sub-pixels within the display area AA. The sub-pixels within the display area AA then illuminate their light-emitting elements, thus displaying the test image. Optionally, the display panel can display the test image in at least one of the following ways:

[0053] In one feasible embodiment, the display panel is controlled to display monochrome test images at different refresh rates.

[0054] For example, controlling the display panel to display a monochrome test screen at a refresh rate of 120 Hz or 60 Hz.

[0055] A monochrome test screen refers to a display panel where only sub-pixels of the same luminous color are lit simultaneously, such as a red display screen, a green display screen, a blue display screen, etc.

[0056] Another feasible implementation involves controlling the monochrome test screen of the display panel at different maximum brightness levels.

[0057] For example, controlling the monochrome test screen of the sub-pixels of the display panel at different maximum brightness (Display Brightness Value, DBV), such as setting the maximum brightness of the sub-pixels of the display panel to a specific percentage of its rated maximum brightness, and displaying monochrome screens under conditions such as maximum brightness of 30%, 50%, 80%, etc.

[0058] In another feasible implementation, the display panel is controlled to display monochrome test images at different gray levels.

[0059] For example, controlling the sub-pixels of the display panel to display monochrome test images at different gray levels, such as 16, 32, 128 gray levels, etc.

[0060] S1102. Use a camera to capture test images and obtain the capture data of the test images.

[0061] For example, the captured data can be the grayscale values ​​of each sub-pixel within the display area AA. For instance, taking a display area AA with 2048×2048 sub-pixels and each sub-pixel having a grayscale value range of 0 to 255, a device such as a charge-coupled device (CCD) camera or a complementary metal-oxide-semiconductor (CMOS) camera can be used to capture the display test image of the display panel, and the grayscale values ​​of each sub-pixel within the display area AA can be output and recorded.

[0062] In other embodiments, the maximum brightness value of each sub-pixel within the display area AA can also be output and recorded, wherein the larger the grayscale value of the sub-pixel, the higher its brightness.

[0063] S1103. Calculate the difference between the actual display brightness and the expected display brightness based on the shooting data.

[0064] The actual display brightness is obtained through testing, while the desired display brightness is a preset known value. By calculating the difference between the actual display brightness and the desired display brightness, the display unevenness compensation value can be obtained.

[0065] S120. Determine the grayscale characteristic parameters based on the display unevenness compensation value.

[0066] In this embodiment, a grayscale feature parameter calculation method can be set in the driver chip to calculate the grayscale feature parameter. This parameter is used to measure the degree of mura of different display panels in the same batch. For different degrees of mura, corresponding gain parameters are used to compensate the display panels, thereby improving the accuracy of demura compensation and enhancing the display quality of the display panels.

[0067] Figure 8 is a flowchart illustrating a method for determining grayscale feature parameters according to an embodiment of this application. Referring to Figure 8, optionally, the grayscale feature parameters are determined based on the display unevenness compensation value, including:

[0068] S121. Obtain the maximum value (offset) from the display unevenness compensation values. max and minimum value offset min .

[0069] In some embodiments, a set of intermediate values ​​of compensation parameters can be preset in the driver chip as initial maximum and minimum values. Each time a set of compensation parameters is input, it is compared with the maximum and minimum values ​​to obtain the maximum and minimum values ​​in the offset compensation parameters. The maximum value is then subtracted from the minimum value to obtain the difference in grayscale feature parameters. Optionally, the larger the value of the grayscale feature parameter, the larger the value of the gain parameter. That is, the higher the feature parameter, the more severe the Mura; the lower the feature parameter, the less severe the Mura.

[0070] S122. Determine the grayscale feature parameter as offset. max -offset min .

[0071] A grayscale feature parameter calculation program can be preset within the driver chip to extract the maximum and minimum values ​​of the offset, and then subtract them to obtain the grayscale feature parameters.

[0072] S130. Based on the grayscale feature parameters, find the grayscale feature parameter and gain parameter comparison table to determine the gain parameter value corresponding to the grayscale feature parameters.

[0073] In some embodiments, a higher feature parameter indicates a more severe Mura, and a lower feature parameter indicates a less severe Mura. Table 1 is a comparison table of grayscale feature parameters and gain parameters provided in an embodiment of this application. Optionally, the value of the grayscale feature parameter is less than or equal to 32, and the value of the gain parameter is less than or equal to 1.6.

[0074] Table 1 Comparison of Gray Scale Feature Parameters and Gain Parameters

[0075] In other embodiments, a grayscale feature parameter and gain parameter comparison table can be designed according to the actual situation.

[0076] S140. Based on the display unevenness compensation value and gain parameter value, perform display unevenness compensation on the display panel.

[0077] In some embodiments, a grayscale feature parameter and gain parameter lookup table is pre-stored in the display panel.

[0078] After determining the corresponding gain parameter value based on the grayscale feature parameter and gain parameter comparison table, display unevenness compensation is performed using the display unevenness compensation value and the corresponding gain parameter value. Compared with related technologies that use the same gain parameter value, the accuracy of display unevenness compensation can be significantly improved, thus enhancing the display effect.

[0079] Optionally, based on the display unevenness compensation value and gain parameter value, display unevenness compensation is performed on the display panel, including:

[0080] According to gray on =gray off +Gain×offset is used to compensate for uneven display.

[0081] In the above formula, gray on Indicates the compensated brightness, gray off This indicates the brightness before compensation, Gain represents the gain parameter value, and offset represents the display unevenness compensation value.

[0082] For example, a CCD camera or CMOS camera can be used to capture the display test image of the display panel, output and record the brightness value of each sub-pixel within the display area AA, i.e., the brightness gray of the display test image before compensation. off Then obtain the display unevenness compensation value offset and the corresponding gain parameter value Gain, according to the formula gray on =gray off +Gain×offset is used to compensate for uneven display.

[0083] Figure 9 is a flowchart illustrating another display unevenness compensation method for a display panel provided in an embodiment of this application. Referring to Figure 9, the display unevenness compensation method includes:

[0084] S210. Conduct an experiment to determine the gain parameters using multiple display panels, and calibrate the grayscale characteristic parameters and the gain parameter comparison table.

[0085] Before compensating for uneven display on the display panel, it is necessary to first determine the lookup table between grayscale characteristic parameters and gain parameters, and then store the lookup table in the display panel.

[0086] Optionally, the grayscale feature parameter and gain parameter lookup table includes grayscale feature parameter values ​​and corresponding gain parameters for multiple gradient distributions. Figure 10 is a flowchart illustrating a calibration of the grayscale feature parameter and gain parameter lookup table provided in an embodiment of this application. Referring to Figure 10, an experiment to determine the gain parameter is conducted using multiple display panels to calibrate the grayscale feature parameter and gain parameter lookup table, including:

[0087] S211. Under the gradient of a grayscale feature parameter, perform display non-uniformity compensation tests on multiple display panels and record multiple sets of gain compensation values.

[0088] S212. Average the multiple gain compensation values ​​to determine the gain parameter value under the gradient of gray-scale characteristic parameters.

[0089] For example, an experiment to determine the gain parameter value can be conducted using five display panels for each grayscale feature parameter gradient. Under each gradient, the grayscale feature value is determined according to the grayscale feature parameter calculation method. The five display panels are then adjusted to the optimal display effect, and the five sets of gain compensation values ​​are recorded. The average value is then obtained as the optimal gain parameter value under that grayscale feature parameter gradient.

[0090] S213. Perform the same experiment under all gray-level feature parameter gradients, record the average value of each group of gain compensation values ​​as the corresponding gain parameter values, and obtain a comparison table of gray-level feature parameters and gain parameters.

[0091] The same experiment was repeated under the grayscale feature parameter gradient, and the average optimal compensation gain value of every 5 display panels was recorded. Finally, a comparison table of grayscale feature parameters and gain parameters was obtained. For example, in one embodiment, the corresponding gain parameters were burned into the display panels with different grayscale feature parameters, and the visual effect was judged. If the compensated display panels had no abnormalities of overcompensation or undercompensation, then a comparison table of grayscale feature parameters and gain parameters with better effect was obtained.

[0092] S220. Obtain the display unevenness compensation value of the screen to be displayed on the display panel.

[0093] S230. Determine the grayscale characteristic parameters based on the display unevenness compensation value.

[0094] S240. Based on the grayscale feature parameters, find the grayscale feature parameter and gain parameter comparison table to determine the gain parameter value corresponding to the grayscale feature parameters.

[0095] S250. Based on the display unevenness compensation value and gain parameter value, perform display unevenness compensation on the display panel.

[0096] In this embodiment, a method for calculating display non-uniformity compensation values ​​is designed to calculate grayscale characteristic parameters. These grayscale characteristic parameters are used to measure the degree of mura in different display panels from the same batch. Corresponding gain parameters are used to compensate for different degrees of mura in the display panels, thereby improving the accuracy of demura compensation and enhancing the display quality of the display panels.

[0097] Figure 11 is a flowchart illustrating another method for compensating for uneven display panel display provided in an embodiment of this application. Referring to Figure 11, the uneven display compensation method includes:

[0098] S310. Obtain the display unevenness compensation value of the screen to be displayed on the display panel.

[0099] S320. Determine the grayscale characteristic parameters based on the display unevenness compensation value.

[0100] S330. Based on the grayscale feature parameters, find the grayscale feature parameter and gain parameter comparison table to determine the gain parameter value corresponding to the grayscale feature parameters.

[0101] S340. Based on the display unevenness compensation value and gain parameter value, perform display unevenness compensation on the display panel.

[0102] S350. Test the compensated display. If uneven display still exists, adjust the gain parameter value and perform uneven display compensation again until the compensation requirements are met.

[0103] In some embodiments, if the compensated display is determined to be overcompensated after testing, the gain parameter value is decreased; if the compensated display is undercompensated after testing, the gain parameter value is increased. The gain parameter value can be adjusted multiple times until the compensation requirements are met. Additionally, if multiple display panels show uneven display after compensation after testing, there may be an inaccuracy in the grayscale characteristic parameter and gain parameter comparison table. The grayscale characteristic parameter and gain parameter comparison table can be recalibrated experimentally.

[0104] This embodiment verifies the effect of uneven display compensation by testing the compensated display screen. If the compensation effect does not meet the requirements, compensation can be performed again to improve the display effect.

[0105] In some embodiments, different display areas of the display panel may have different levels of mura. Optionally, the display area of ​​the display panel may be divided into at least two sub-display areas, and the at least two sub-display areas may correspond to different grayscale feature parameters and gain parameter lookup tables.

[0106] Figure 12 is a schematic diagram of another display panel structure provided in an embodiment of this application. Referring to Figure 12, the display area AA is pre-divided into at least two sub-display areas. For example, as shown in Figure 12, the display area AA can be divided into 9 sub-display areas according to the long side (Y direction) and short side (X direction), such as the first sub-display area V1, the second sub-display area V2, the third sub-display area V3, the fourth sub-display area V4, the fifth sub-display area V5, the sixth sub-display area V6, the seventh sub-display area V7, the eighth sub-display area V8, and the ninth sub-display area V9.

[0107] The number of sub-pixels in each sub-display area can be the same or different; the number of sub-pixels in each sub-display area can be one or more. When the number of sub-pixels in a sub-display area is one, the embodiments of this application can also compensate for the display brightness of a single sub-pixel to achieve precise compensation for display brightness at the sub-pixel level.

[0108] Based on the above embodiments, referring to Figure 12, optionally, the display area can be divided as follows:

[0109] The display area is divided into multiple sub-display areas arranged in an array, and the sub-display areas are of the same size.

[0110] For example, referring to Figure 12, in some embodiments, the display area AA can be divided into multiple sub-display areas arranged in an array, with each sub-display area having the same area. For example, the display area AA can be divided into nine sub-display areas of the same area, V1 to V9. The number of sub-pixels 20 in the nine sub-display areas can be the same or different.

[0111] Figure 13 is a schematic diagram of another display panel provided in an embodiment of this application. Based on the above embodiments, optionally, the method for dividing the display area further includes:

[0112] The display area is divided into multiple sub-display areas arranged in an array, with at least two sub-display areas having different areas.

[0113] For example, referring to Figure 13, in some embodiments, the display area AA can be divided into multiple sub-display areas arranged in an array, each sub-display area having a different area. For example, the display area AA can be divided into nine sub-display areas of different areas, V1 to V9. The number of sub-pixels in the nine sub-display areas can be the same or different.

[0114] Figure 14 is a schematic diagram of another display panel provided in an embodiment of this application. Based on the above embodiment, referring to Figure 14, the display area AA of the display panel 10 is rectangular. Optionally, the method for dividing the display area further includes:

[0115] The display area is divided into at least two sub-display areas arranged along the diagonal of a rectangle, and at least one sub-display area includes a first sub-display area extending along a first direction and a second sub-display area extending along a second direction.

[0116] The first direction (X direction in Figure 14) and the second direction (Y direction in Figure 14) are parallel to the side length of the rectangle, respectively.

[0117] For example, referring to Figure 14, the display area AA is divided into 5 sub-display areas, namely the first sub-display area V1, the second sub-display area V2, the third sub-display area V3, the fourth sub-display area V4, and the fifth sub-display area V5. Taking the third sub-display area V3 as an example, the third sub-display area V3 is composed of the first sub-display area V31 extending along the X direction in Figure 14 and the second sub-display area V32 extending along the Y direction in Figure 14, that is, V3 = V31 + V32. The coordinate parameters of the sub-display areas V1 to V5 are shown in Table 2.

[0118] Table 2 shows the coordinate parameters of the V1 to V5 sub-display areas.

[0119] In the table above, V3_XS refers to the coordinates of the starting sub-pixel of the third sub-display area V3 along the X direction in Figure 14, V3_XE refers to the coordinates of the ending sub-pixel of the third sub-display area V3 along the X direction in Figure 14, V3_YS refers to the coordinates of the starting sub-pixel of the third sub-display area V3 along the Y direction in Figure 14, and V3_YE refers to the coordinates of the ending sub-pixel of the third sub-display area V3 along the Y direction in Figure 14. Similarly, in this embodiment, the size and position of the blocks can be freely defined according to display uniformity, and custom blocks can have their corresponding grayscale feature parameters and gain parameters set separately.

[0120] Figure 15 is a schematic diagram of another display panel provided in an embodiment of this application. Based on the above embodiment, the display area AA of the display panel 10 is rectangular. Optionally, the method of dividing the display area further includes:

[0121] The display area is divided into multiple sub-display areas from the center outwards, and each sub-display area is set with a separate grayscale feature parameter and gain parameter reference table.

[0122] For example, referring to Figure 15, the display area AA is divided into four nested sub-display areas, V1 to V4. Each sub-display area is set with a corresponding grayscale feature parameter and gain parameter comparison table. The display unevenness compensation method provided in the above embodiment can be used to uniformly compensate the display of the display area AA, ensuring the display uniformity of the display panel.

[0123] Figure 16 is a structural schematic diagram of another display panel provided in this application, and Figure 17 is a partially enlarged schematic diagram of the display panel in region M of Figure 16. Based on the above embodiments, referring to Figures 16 and 17, the display area AA of the display panel 10 includes a first region A1 and a second region A2. The first region A1 includes multiple fan-out traces F1. The fan-out traces F1 are respectively connected to the driver chip (Integrated Circuit, IC) and the sub-pixel 20, and are used to transmit one or more of the voltage signal, data signal, and scan signal provided by the driver chip IC. Optionally, the method of dividing the display area further includes:

[0124] The first and second regions are divided into two sub-display areas.

[0125] For example, referring to Figures 16 and 17, in order to meet the application requirements of narrow bezels of the display panel 10, in some embodiments, a portion of the fan-out traces F1 are set between two adjacent sub-pixels 20 in the first region A1 of the display area AA, and connected to the sub-pixels 20 in the second region A2 of the display area AA by means of winding or other methods. However, if the entire display panel 10 uses the same grayscale feature parameter and gain parameter comparison table, when displaying at 100% low brightness and low grayscale, the influence of the fan-out traces F1 between adjacent sub-pixels 20 can easily lead to a "Λ"-shaped Mura problem, that is, uneven display in the first region A1 area, which affects the display effect. However, if the Demura compensation in the related technology is used, the high grayscale will have an overcompensation phenomenon, which makes it difficult to solve the "Λ"-shaped Mura problem.

[0126] In this embodiment, the display area AA can be divided into at least two areas according to the "Λ"-shaped Mura region. The first area A1 can also be called the "Λ"-shaped Mura region, and the second area A2 can also be called the non-"Λ"-shaped Mura region. The first area A1 and the second area A2 are respectively divided into two sub-display areas. For example, the first area A1 is divided into the first sub-display area V10, and the second area A2 is divided into the second sub-display area V11. For the display non-uniformity of each area, a corresponding grayscale feature parameter and gain parameter comparison table is set for the first sub-display area V10 and the second sub-display area V11 to achieve the optimal brightness compensation effect.

[0127] Based on the above embodiments, the second region A2 can be further divided into multiple sub-display areas. For the display unevenness of each region, a corresponding grayscale feature parameter and gain parameter comparison table is set for each sub-display area to achieve the optimal brightness compensation effect.

[0128] This application also provides a display device, including the display panel provided in the above embodiments. FIG18 is a schematic diagram of the structure of a display device provided in an embodiment of this application. Referring to FIG18, the display device 100 includes any of the display panels 10 provided in the above embodiments. Therefore, the display device also has the beneficial effects of the display panels in the above embodiments. The similarities can be understood by referring to the explanation of the display panel above.

[0129] The display device 100 provided in this application embodiment can be a mobile phone as shown in FIG18, or other electronic products with display functions, such as the following categories: television, laptop, desktop monitor, tablet computer, digital camera, smart bracelet, smart glasses, vehicle display, industrial control equipment, medical display screen and touch interactive terminal, etc.

[0130] Referring again to Figure 18, optionally, the display device also includes a driver chip IC. The driver chip IC has a pre-stored grayscale feature parameter and gain parameter lookup table. The driver chip IC is used to determine the gain parameter value according to the grayscale feature parameter and gain parameter lookup table when the display panel 10 is displaying, so as to compensate for the uneven display of the display panel 10.

Claims

1. A method for compensating for uneven display on a display panel, comprising: Obtain the display unevenness compensation value of the image to be displayed on the display panel; Based on the aforementioned unevenness compensation value, determine the grayscale feature parameters; Based on the grayscale feature parameters, look up the grayscale feature parameter and gain parameter lookup table to determine the gain parameter value corresponding to the grayscale feature parameters; Based on the display unevenness compensation value and the gain parameter value, the display screen of the display panel is compensated for display unevenness. The grayscale feature parameter and gain parameter lookup table is pre-stored in the display panel.

2. The method for compensating for uneven display of a display panel according to claim 1, wherein, The display panel includes a storage unit, and the step of obtaining the display unevenness compensation value of the image to be displayed on the display panel includes: Obtain the display unevenness compensation data stored in the storage unit; The display unevenness compensation data is decompressed to obtain the display unevenness compensation value.

3. The method for compensating for uneven display of a display panel according to claim 2, wherein, The display unevenness compensation value is the difference between the actual display brightness and the desired display brightness, and the method for determining the display unevenness compensation value includes: The control panel displays the test screen; The test images are captured using a camera to obtain the capture data of the test images; Based on the captured data, the difference between the actual display brightness and the desired display brightness is calculated.

4. The method for compensating for uneven display of a display panel according to claim 3, wherein, The control display panel displays test screens including at least one of the following: Control the monochrome test screen of the display panel at different refresh rates; Control the monochrome test screen of the display panel at different maximum brightness levels; Control the monochrome test screen of the display panel at different gray levels.

5. The method for compensating for uneven display of a display panel according to claim 1, wherein, The step of determining grayscale feature parameters based on the display unevenness compensation value includes: Obtain the maximum value offset from the display unevenness compensation values. max and minimum value offset min ; The grayscale feature parameter is determined to be offset. max -offset min .

6. The method for compensating for uneven display in a display panel according to claim 1, wherein before obtaining the uneven display compensation value of the image to be displayed on the display panel, the method further comprises: An experiment was conducted using multiple display panels to determine the gain parameters, and a comparison table of grayscale characteristic parameters and gain parameters was established.

7. The method for compensating for uneven display of a display panel according to claim 6, wherein, The grayscale feature parameter and gain parameter lookup table includes grayscale feature parameter values ​​with multiple gradient distributions and corresponding gain parameters. The experiment of determining the gain parameters using multiple display panels, and calibrating the grayscale feature parameter and gain parameter lookup table, includes: Under the gradient of the grayscale feature parameter, a display non-uniformity compensation test is performed on multiple display panels, and multiple sets of gain compensation values ​​are recorded. The average of the multiple sets of gain compensation values ​​is used to determine the gain parameter value under the gradient of gray-level feature parameters. The same experiment was conducted under all gray-level feature parameter gradients, and the average value of each group of gain compensation values ​​was recorded as the corresponding gain parameter value, thus obtaining a table of gray-level feature parameters and gain parameters.

8. The method for compensating for uneven display of a display panel according to claim 1, wherein, The larger the value of the grayscale feature parameter, the larger the value of the gain parameter.

9. The method for compensating for uneven display in a display panel according to claim 8, wherein, The value of the grayscale feature parameter is less than or equal to 32, and the value of the gain parameter is less than or equal to 1.

6.

10. The method for compensating for uneven display of a display panel according to claim 1, wherein, The step of compensating for display unevenness on the display panel based on the display unevenness compensation value and the gain parameter value includes: According to gray on =gray off +Gain×offset is used to compensate for uneven display; gray on Indicates the compensated brightness, gray off The value represents the brightness before compensation, Gain represents the gain parameter value, and offset represents the display unevenness compensation value.

11. The method for compensating for uneven display of a display panel according to claim 1, wherein after performing uneven display compensation on the display screen of the display panel based on the uneven display compensation value and the gain parameter value, the method further includes: The compensated display screen is tested. If the test result shows that uneven display still exists, the gain parameter value is adjusted and uneven display compensation is performed again until the compensation requirements are met.

12. The method for compensating for uneven display of a display panel according to claim 1, wherein, The display area of ​​the display panel is divided into at least two sub-display areas, and the at least two sub-display areas correspond to different grayscale feature parameters and gain parameter comparison tables.

13. A display panel, wherein the display panel employs the display unevenness compensation method according to any one of claims 1 to 12 to improve display uniformity during display.

14. A display device comprising the display panel and driver chip as described in claim 13.

15. The display device according to claim 14, wherein, The driver chip has a pre-stored grayscale feature parameter and gain parameter lookup table. The driver chip is used to determine the gain parameter value according to the grayscale feature parameter and gain parameter lookup table when the display panel is displaying, so as to compensate for the uneven display of the display panel.

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