A gray scale compensation method of a display panel and a display device

Abstract

The application discloses a gray scale compensation method of a display panel and a display device, and aims at solving the problem that the luminance of a light emitting device is inconsistent with the target luminance. The gray scale compensation method of the display panel provided by the embodiment of the application comprises the following steps: determining the luminance of each light emitting device according to a to-be-displayed picture; determining whether the luminance of a first light emitting device in N light emitting devices in a pixel is greater than the luminance of a second light emitting device, and whether the gray scale corresponding to the luminance of the first light emitting device is greater than a first preset gray scale; if yes, compensating a first data signal inputted by a first data signal input circuit electrically connected with the pixel according to a first mapping relationship and a second mapping relationship, and loading the compensated first data signal into the first data signal input circuit; and if no, loading the first data signal into the first data signal input circuit according to the first mapping relationship.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a grayscale compensation method and display device for a display panel. Background Technology

[0002] In recent years, sub-millimeter and even micrometer-scale light-emitting diodes based on the principle of inorganic light-emitting diodes have become self-emissive devices with a series of advantages such as high brightness, ultra-low latency, and ultra-wide viewing angle, and have good market prospects. Summary of the Invention

[0003] This application provides a grayscale compensation method and display device for a display panel to solve the problem of inconsistent brightness between the light-emitting device and the target brightness.

[0004] This application provides a grayscale compensation method for a display panel. The display panel includes: multiple pixels and multiple driving circuits; each pixel includes N light-emitting devices, which are connected end-to-end and numbered sequentially according to their connection order; among the N light-emitting devices connected end-to-end, the first electrode of the nth light-emitting device is electrically connected to the second electrode of the (n+1)th light-emitting device, where n is an integer greater than or equal to 1 and less than N; the multiple driving circuits include multiple data signal input circuits, and the second electrode of each light-emitting device is further configured to be electrically connected to different data signal input circuits respectively; the method includes:

[0005] The brightness of each light-emitting device is determined based on the image to be displayed;

[0006] Determine whether the brightness of the first light-emitting device among N light-emitting devices in a pixel is greater than the brightness of the second light-emitting device, and whether the gray level corresponding to the brightness of the first light-emitting device is greater than the first preset gray level.

[0007] If so, then according to the first mapping relationship and the second mapping relationship, the first data signal input to the first data signal input circuit electrically connected to the pixel is compensated, and the compensated first data signal is loaded onto the first data signal input circuit; the first data signal input circuit is a data signal input circuit electrically connected to the first light-emitting device;

[0008] If not, then according to the first mapping relationship, the first data signal is loaded onto the first data signal input circuit electrically connected to the pixel;

[0009] The first mapping relationship is the mapping relationship between the first data signal and the brightness; the second mapping relationship is the mapping relationship between the first compensation voltage and the brightness.

[0010] In some embodiments, the method further includes: establishing a first mapping relationship, specifically including:

[0011] Light up the first light-emitting device among the N light-emitting devices in each pixel to the maximum brightness, obtain the average brightness of the maximum brightness of the first light-emitting device of all pixels, and determine the first target grayscale and brightness mapping relationship of the first light-emitting device based on the average brightness of the maximum brightness of the first light-emitting device.

[0012] According to the preset mapping relationship between the first data signal and the gray level, select k first data signals corresponding to k preset gray levels and input k first data signals to the first data signal input circuit in sequence. Do not load data signals to the other data signal input circuits outside the first data signal input circuit, and obtain the actual brightness value of the first light-emitting device under k preset gray levels.

[0013] Based on the mapping relationship between the first target gray level and brightness, target brightness values ​​at k preset gray levels are obtained. Based on the relationship between the actual brightness values ​​at the k preset gray levels and the target brightness values ​​at the k preset gray levels, the first data signal is corrected to obtain the first data signal correction values ​​corresponding to different gray levels. Based on the first data signal correction values ​​corresponding to different gray levels, the corrected first data signal, gray level, and brightness mapping relationship is obtained. The corrected first data signal, gray level, and brightness mapping relationship is used as the first mapping relationship.

[0014] In some embodiments, the display panel includes a display area, a plurality of pixels are located in the display area, and the display area is divided into m regions with the same area; obtaining the average brightness of the maximum brightness of the first light-emitting device of all pixels specifically includes:

[0015] Obtain the maximum brightness of the first light-emitting device in each of the m regions, and use the average of the maximum brightness of the m regions as the average brightness of the maximum brightness of the first light-emitting device of all pixels.

[0016] In some embodiments, determining the first target grayscale and brightness mapping relationship of the first light-emitting device based on the average brightness value of the maximum brightness of the first light-emitting device specifically includes:

[0017] Determine whether the average brightness value L1 of the maximum brightness of the first light-emitting device is greater than or equal to L1min; where L1min is the preset minimum brightness value of the maximum brightness of the first light-emitting device.

[0018] If so, and the average brightness L1 of the maximum brightness of the first light-emitting device satisfies: L1>L1max, then the grayscale and brightness mapping relationship corresponding to L1max is taken as the first target grayscale and brightness mapping relationship; where L1max is the preset maximum brightness value of the maximum brightness of the first light-emitting device.

[0019] If so, and the average brightness L1 of the maximum brightness of the first light-emitting device satisfies: L1max≥L1≥L1min, then the preset grayscale and brightness mapping relationship is taken as the first target grayscale and brightness mapping relationship.

[0020] In some embodiments, k = 5, and the k preset gray levels are 64, 92, 128, 192, and 230, respectively.

[0021] In some embodiments, the method further includes: determining a first preset grayscale, specifically including:

[0022] In the first display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are sequentially input so that the N light-emitting devices in the pixel are lit up under the drive of different first data signals, and the actual average brightness of the first light-emitting devices in m areas under different gray levels is obtained.

[0023] In the second display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are input sequentially to light up the first light-emitting device, and the remaining light-emitting devices among the N light-emitting devices are turned off through the other data signal input circuit to obtain the actual average brightness of the first light-emitting device in m areas under different gray levels.

[0024] The smallest gray level where the average actual brightness of the light-emitting device differs under the same gray level in the first display mode and the second display mode is taken as the first preset gray level.

[0025] In some embodiments, the method further includes: establishing a second mapping relationship, specifically including:

[0026] In the first display mode, the actual brightness value of the first light-emitting device under k preset gray levels is obtained, and the mapping relationship between the first gray level and the brightness is obtained based on the k preset gray levels and the actual brightness value corresponding to the k preset gray levels.

[0027] In the second display mode, the actual brightness value of the first light-emitting device under k preset gray levels is obtained, and the mapping relationship between the second gray level and the brightness is obtained based on the k preset gray levels and the actual brightness value corresponding to the k preset gray levels.

[0028] When the gray level is greater than the first preset gray level, the gray level difference between the first gray level and the brightness mapping relationship and the second gray level and the brightness mapping relationship under the same brightness is determined, and the first compensation voltage for different gray levels is determined according to the gray level difference, and the mapping relationship between the first compensation voltage and the brightness is used as the second mapping relationship.

[0029] In some embodiments, the method further includes: determining a first preset grayscale, specifically including:

[0030] In the first display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are sequentially input so that the N light-emitting devices in the pixel are lit up under the drive of the different first data signals, and the actual brightness values ​​of the first light-emitting devices in m areas under different gray levels are obtained.

[0031] In the second display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are sequentially input to light up the first light-emitting device, and the remaining light-emitting devices among the N light-emitting devices are turned off through the other data signal input circuit to obtain the actual brightness value of the first light-emitting device in m areas under different gray levels.

[0032] For any region among the m regions, the smallest gray level where the average actual brightness of the light-emitting device differs under the same gray level in the first display mode and the second display mode is taken as the first preset gray level for that region.

[0033] In some embodiments, the method further includes: establishing a second mapping relationship, specifically including:

[0034] In the first display mode, the actual brightness value of the first light-emitting device in each of the m regions under k preset gray levels is obtained, and the mapping relationship between the first gray level and brightness of each region in the m regions is obtained based on the k preset gray levels and the actual brightness value corresponding to the k preset gray levels.

[0035] In the second display mode, the actual brightness value of the first light-emitting device in each of the m regions under k preset gray levels is obtained, and the second gray level and brightness mapping relationship of each region in the m regions is obtained according to the k preset gray levels and the actual brightness value corresponding to the k preset gray levels.

[0036] For any region among the m regions, when the gray level is greater than the first preset gray level, determine the gray level difference between the mapping relationship between the first gray level and the brightness and the mapping relationship between the second gray level and the brightness under the same brightness, and determine the first compensation voltage for different gray levels based on the gray level difference, and take the mapping relationship between the first compensation voltage and the brightness as the second mapping relationship for that region.

[0037] In some embodiments, after determining the brightness of each light-emitting device based on the image to be displayed, the method further includes:

[0038] Determine the region of the light-emitting device and determine the first preset gray level corresponding to the region.

[0039] In some embodiments, the method further includes:

[0040] Light up the nth light-emitting device among the N light-emitting devices in each pixel to the maximum brightness, obtain the average brightness of the maximum brightness of the nth light-emitting device of all pixels, and determine the target grayscale and brightness mapping relationship of the nth light-emitting device based on the average brightness of the maximum brightness of the nth light-emitting device; where n is an integer greater than 1 and less than or equal to N;

[0041] Based on the preset negative data signal and grayscale mapping relationship corresponding to the nth light-emitting device, k negative data signals corresponding to k preset grayscales are selected and sequentially input to the nth data signal input circuit. No data signals are loaded to the other data signal input circuits outside the nth data signal input circuit. The actual brightness value of the nth light-emitting device under k preset grayscales is obtained in the first working mode. The nth data signal input circuit is a data signal input circuit electrically connected to the nth light-emitting device.

[0042] Based on the target grayscale and brightness mapping relationship of the nth light-emitting device, the target brightness value of the nth light-emitting device under k preset grayscale is obtained. Based on the relationship between the actual brightness value of the nth light-emitting device under k preset grayscale and the target brightness value of the nth light-emitting device under k preset grayscale in the first working mode, the data signal of the nth data signal input circuit is corrected to obtain the data signal correction value of the nth data signal input circuit under different grayscale in the first working mode. Based on the data signal correction value of the nth data signal input circuit under different grayscale in the first working mode, the corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the first working mode is obtained. The corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the first working mode is used as the third mapping relationship of the nth light-emitting device.

[0043] A first data signal is applied to the first data signal input circuit to illuminate the first light-emitting device and maintain a gray level of 255. According to the preset positive data signal and gray level mapping relationship corresponding to the nth light-emitting device, k positive data signals corresponding to k preset gray levels are selected and input to the nth data signal input circuit in sequence. No data signals are applied to the other data signal input circuits other than the first data signal input circuit and the nth data signal input circuit. The actual brightness value of the nth light-emitting device under k preset gray levels in the second working mode is obtained.

[0044] Based on the target grayscale and brightness mapping relationship of the nth light-emitting device, the target brightness value of the nth light-emitting device under k preset grayscales is obtained. Based on the relationship between the actual brightness value of the nth light-emitting device under k preset grayscales and the target brightness value of the nth light-emitting device under k preset grayscales in the second working mode, the data signal of the nth data signal input circuit is corrected to obtain the data signal correction value of the nth data signal input circuit under different grayscales in the second working mode. Based on the data signal correction value of the nth data signal input circuit under different grayscales in the second working mode, the corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the second working mode is obtained. The corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the second working mode is used as the fourth mapping relationship of the nth light-emitting device.

[0045] In some embodiments, after determining the brightness of each light-emitting device based on the image to be displayed, the method further includes:

[0046] If the nth data signal input circuit is in the first working mode, then according to the third mapping relationship, a data signal is loaded onto the nth data signal input circuit; where n is an integer greater than 1 and less than or equal to N;

[0047] If the nth data signal input circuit is in the second working mode, then according to the fourth mapping relationship, a data signal is loaded onto the nth data signal input circuit; where n is an integer greater than 1 and less than or equal to N.

[0048] In some embodiments, N = 3.

[0049] In some embodiments, the method further includes: obtaining the brightness of the light-emitting device using a brightness testing device.

[0050] This application provides a display device, which includes: a display panel and a control circuit bound to the display panel;

[0051] The display panel includes: multiple pixels and multiple driving circuits; each pixel includes N light-emitting devices, which are connected end-to-end and numbered sequentially according to the connection order; the first electrode of the N sequentially connected light-emitting devices is electrically connected to the second electrode of the (n+1)th light-emitting device, where n is an integer greater than or equal to 1 and less than N; the multiple driving circuits include multiple data signal input circuits, and the second electrode of each light-emitting device is configured to be electrically connected to a different data signal input circuit respectively;

[0052] The control circuit is used to execute the grayscale compensation method provided in the embodiments of this application.

[0053] The grayscale compensation method and display device for the display panel provided in this application embodiment, when the brightness of the first light-emitting device is greater than the brightness of the second light-emitting device, and when the grayscale corresponding to the brightness of the first light-emitting device is greater than the first preset grayscale, compensates the first data signal according to the first mapping relationship, i.e., the mapping relationship between the first data signal and the brightness, and the second mapping relationship, i.e., the mapping relationship between the first compensation voltage and the brightness. This can avoid the current output by the first data signal input circuit to the first light-emitting device being affected by Vds, avoid the inconsistency between the actual brightness of the first light-emitting device and the target brightness, improve the brightness accuracy of the first light-emitting device, and thus improve the display effect of the display panel. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of this application;

[0056] Figure 2 A graph showing the relationship between Ids and Vds of the driving transistor provided in an embodiment of this application;

[0057] Figure 3 A schematic flowchart illustrating a grayscale compensation method for a display panel provided in an embodiment of this application;

[0058] Figure 4 This application provides a schematic diagram of a grayscale and brightness curve S1 obtained by fitting actual brightness values ​​under k preset grayscale levels and a first target grayscale and brightness curve S2, which is provided in an embodiment of the present application.

[0059] Figure 5 A schematic diagram of m regions of a display panel provided in an embodiment of this application;

[0060] Figure 6 This is a schematic diagram of different grayscale brightness curves provided in the embodiments of this application;

[0061] Figure 7 A schematic diagram of a grayscale brightness curve S3 corresponding to a first grayscale and brightness mapping relationship and a grayscale brightness curve S4 corresponding to a second grayscale and brightness mapping relationship provided in an embodiment of this application;

[0062] Figure 8 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Furthermore, the embodiments and features in the embodiments of this application can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0064] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0065] It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect actual proportions and are intended only to illustrate the content of this application. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0066] This application provides a display panel, such as... Figure 1 As shown, the display panel includes: multiple pixels 1 and multiple driving circuits 2; each pixel 1 includes N light-emitting devices 3, which are connected end to end and numbered sequentially according to the connection order; among the N light-emitting devices 3 connected end to end, the first electrode of the nth light-emitting device 30n is electrically connected to the second electrode of the (n+1)th light-emitting device 30n+1, where n is an integer greater than or equal to 1 and less than N, i.e., the N light-emitting devices 3 are connected in series; the multiple driving circuits 2 include multiple data signal input circuits 4, and the second electrode of each light-emitting device 3 is also configured to be connected to different data signal input circuits 4 respectively.

[0067] The display panel provided in this application embodiment has N light-emitting devices connected in series in one pixel, so that the N light-emitting devices can share the current, which can save the overall power consumption of the display panel.

[0068] In some embodiments, such as Figure 1As shown, the data signal input circuit 4 corresponds one-to-one with the light-emitting device 3; that is, one pixel is electrically connected to N data signal input circuits 4. Among the N data signal input circuits 4, the first data signal input circuit 401 is the data signal input circuit 4 electrically connected to the first light-emitting device 301, the second data signal input circuit 402 is the data signal input circuit 4 electrically connected to the second light-emitting device 302, and so on. It will not be described in detail here.

[0069] The data signal input circuit connected to the second electrode of the nth light-emitting device is the nth data signal input circuit. The data signal input terminal of the nth data signal input circuit receives the nth data signal dan. That is, the data signal input terminal of the data signal input circuit connected to the second electrode of the first light-emitting device receives the first data signal da1, the data signal input terminal of the data signal input circuit connected to the second electrode of the second light-emitting device receives the second data signal da2, and the data signal input terminal of the data signal input circuit connected to the second electrode of the third light-emitting device receives the second data signal da3.

[0070] In some embodiments, the first electrode is the anode of the light-emitting device, and the second electrode is the cathode of the light-emitting device.

[0071] In some embodiments, such as Figure 1 As shown, the second electrode of the last light-emitting device 30N among the N light-emitting devices 3 is electrically connected to the first level signal terminal VSS; the first level signal terminal VSS can be, for example, a ground level signal terminal.

[0072] In some embodiments, among the N data signal input circuits electrically connected to a pixel, the remaining data signal input circuits other than the first data signal input circuit include a first branch and a second branch; the current through the (n-1)th light-emitting device is v(n-1), where n is an integer greater than 1 and less than or equal to N;

[0073] In the first working mode of the data signal input circuit, the current of the data input signal of the nth data signal input circuit is negative, and the current v1 of the first branch is written into the anode of the nth light-emitting device. Then the current through the nth light-emitting device is v(n-1)+v1; that is, the first working mode of the data signal input circuit is the current compensation mode, and the brightness of the nth light-emitting device is greater than the brightness of the (n-1)th light-emitting device.

[0074] In the second operating mode of the data signal input circuit, the current of the data input signal of the nth data signal input circuit is positive, and the current v2 of the second branch is written into the anode of the nth light-emitting device. Then the current through the nth light-emitting device is v(n-1)-v2; that is, the second operating mode of the data signal input circuit is the current extraction mode, and the brightness of the nth light-emitting device is less than the brightness of the (n-1)th light-emitting device.

[0075] In some embodiments, both the first branch and the second branch are electrically connected to the data signal input terminal. The first branch includes a first level signal input terminal, which receives a first level signal. The second branch includes a second level signal input terminal, which receives a second level signal.

[0076] In some embodiments, the data signal input circuit includes a driving transistor.

[0077] It should be noted that, as Figure 2 As shown, when the source-drain voltage of the driving transistor, Vds, is in the unsaturated region, the source-drain current, Ids, is affected not only by the gate-source voltage, Vgs, but also by Vds, resulting in an increase in the actual source-drain current I of the driving transistor. ds2 With the target source leakage current I ds1 They are not the same. Therefore, the current of the light-emitting device electrically connected to the driving transistor will be affected by Vds, and the actual brightness of the light-emitting device will also be different from the target brightness. When the data signal input circuit electrically connected to the second light-emitting device is in the second operating mode, i.e., the current-pumping mode, the brightness of the first light-emitting device is greater than that of the second light-emitting device. The Vds of the driving transistor electrically connected to the first light-emitting device may reach the unsaturated region, so the current of the first light-emitting device will be affected, and the brightness of the first light-emitting device will be affected and inconsistent with the target brightness.

[0078] This application provides a grayscale compensation method for a display panel, such as... Figure 3 As shown, the grayscale compensation methods for the display panel include:

[0079] S101. Determine the brightness of each light-emitting device according to the image to be displayed;

[0080] S102. Determine whether the brightness of the first light-emitting device among the N light-emitting devices in the pixel is greater than the brightness of the second light-emitting device, and the gray level corresponding to the brightness of the first light-emitting device is greater than the first preset gray level.

[0081] If so, S103, then according to the first mapping relationship and the second mapping relationship, the first data signal input to the first data signal input circuit electrically connected to the pixel is compensated, and the compensated first data signal is loaded onto the first data signal input circuit;

[0082] If not, S104, then according to the first mapping relationship, load the first data signal into the first data signal input circuit electrically connected to the pixel;

[0083] The first mapping relationship is the mapping relationship between the first data signal and the brightness; the second mapping relationship is the mapping relationship between the first compensation voltage and the brightness.

[0084] It should be noted that the first preset gray level can be understood as follows: when the gray level of the first light-emitting device exceeds the first preset gray level, the source and drain current of the transistor driven by the first data signal input circuit is located in the unsaturated region, and the brightness of the first light-emitting device will be affected by Vds.

[0085] The grayscale compensation method for a display panel provided in this application involves compensating the first data signal based on a first mapping relationship (i.e., the mapping relationship between the first data signal and brightness) and a second mapping relationship (i.e., the mapping relationship between the first data signal and brightness) and a second mapping relationship (i.e., the mapping relationship between the first compensation voltage and brightness). This prevents the current output from the first data signal input circuit to the first light-emitting device from being affected by Vds, avoids inconsistencies between the actual brightness and the target brightness of the first light-emitting device, improves the brightness accuracy of the first light-emitting device, and thus improves the display effect of the display panel. When the brightness of the first light-emitting device is greater than that of the second light-emitting device, and the grayscale corresponding to the brightness of the first light-emitting device is less than or equal to the first preset grayscale, or the brightness of the first light-emitting device is less than or equal to that of the second light-emitting device, the current output from the first data signal input circuit to the first light-emitting device will not be affected by Vds. Therefore, no compensation is needed for the first row of data signals. Based on the first mapping relationship (i.e., the mapping relationship between the first data signal and brightness), applying the first data signal to the first data signal input circuit electrically connected to the pixel can make the brightness of the first light-emitting device reach the target brightness.

[0086] In some embodiments, the method further includes: establishing a first mapping relationship, specifically including:

[0087] S201. Light up the first light-emitting device among the N light-emitting devices in each pixel to its maximum brightness, obtain the average brightness of the maximum brightness of the first light-emitting device in all pixels, and determine the first target grayscale mapping relationship between the first light-emitting device and its brightness based on the average brightness of the maximum brightness of the first light-emitting device; for example... Figure 4 As shown, the mapping relationship between the gray level and brightness of the first target can be, for example, the gray level and brightness curve S1 of the first target;

[0088] S202. According to the preset mapping relationship between the first data signal and the gray level, select k first data signals corresponding to k preset gray levels and input k first data signals to the first data signal input circuit in sequence. Do not load data signals to the other data signal input circuits outside the first data signal input circuit, and obtain the actual brightness value of the first light-emitting device under k preset gray levels.

[0089] S203. Based on the mapping relationship between the first target gray level and brightness, obtain the target brightness values ​​under k preset gray levels. Based on the relationship between the actual brightness values ​​under the k preset gray levels and the target brightness values ​​under the k preset gray levels, correct the first data signal to obtain the first data signal correction values ​​corresponding to different gray levels. Based on the first data signal correction values ​​corresponding to different gray levels, obtain the corrected first data signal, gray level, and brightness mapping relationship. Use the corrected first data signal, gray level, and brightness mapping relationship as the first mapping relationship.

[0090] It should be noted that, without compensation for the first data signal, when k first data signals are input according to the preset mapping relationship between the first data signal and grayscale, the actual brightness values ​​under the k preset grayscale levels may deviate from the target brightness value. Figure 4 As shown, the grayscale and brightness curve S1 obtained by fitting the actual brightness values ​​under k preset grayscale levels deviates from the first target grayscale and brightness curve S2.

[0091] The grayscale compensation method provided in this application corrects the first data signal based on the relationship between the actual brightness value under k preset grayscale levels and the target brightness value under k preset grayscale levels, thereby obtaining the first data signal correction value corresponding to different grayscale levels. This makes the grayscale and brightness mapping relationship in the corrected first data signal, grayscale, and brightness mapping relationship consistent with or approximately close to the first target grayscale and brightness mapping relationship, thus avoiding an excessive difference between the brightness of the first light-emitting device and the target brightness.

[0092] It should be noted that when the first data signal is applied to the first data signal input circuit, and no data signal is applied to the other data signal input circuits besides the first data signal input circuit, all N light-emitting devices in a pixel will be lit.

[0093] In some embodiments, the maximum brightness of the first light-emitting device corresponds to a gray level of 255.

[0094] In some embodiments, the method further includes: obtaining the brightness of the light-emitting device using a brightness testing device. Specifically, the brightness testing device can be used to obtain the maximum brightness of the first light-emitting device across all pixels, and the brightness testing device can be used to obtain the actual brightness values ​​of the first light-emitting device at k preset gray levels.

[0095] In some embodiments, the brightness testing equipment includes, for example, a macro lens and a charge-coupled device (CCD) camera.

[0096] In some embodiments, N = 3.

[0097] In some embodiments, k = 5, and the k preset gray levels are 64, 92, 128, 192, and 230, respectively.

[0098] In some embodiments, the display panel is electrically connected to the control circuit; the control circuit can be used to store the first target grayscale and brightness mapping relationship obtained in step S201 and the first mapping relationship obtained in step S203.

[0099] In some embodiments, the display panel includes a display area, and a plurality of pixels are located in the display area, such as Figure 5 As shown, the display area AA is divided into m regions P with the same area; that is, the area of ​​each of the m regions is the same. Figure 5 The example given is m=9.

[0100] Obtain the average brightness of the maximum brightness of the first light-emitting device of all pixels, specifically including:

[0101] Obtain the maximum brightness of the first light-emitting device in each of the m regions, and use the average of the maximum brightness of the m regions as the average brightness of the maximum brightness of the first light-emitting device of all pixels.

[0102] When m=9, the maximum brightness of 9 regions is obtained, and the average of the 9 maximum brightness values ​​is taken as the average brightness of the maximum brightness of the first light-emitting device of all pixels.

[0103] In some embodiments, such as Figure 5 As shown, the maximum brightness of the first light-emitting device in each of the m regions is obtained, specifically including:

[0104] For any region P, the maximum brightness of the first light-emitting device in that region is taken as the maximum brightness of the first light-emitting device in that region.

[0105] For example, the maximum brightness of the first light-emitting device at the center of each region P can be obtained as the maximum brightness of the region.

[0106] The grayscale compensation method for the display panel provided in this application divides the display area of ​​the display panel into m regions with the same area, and obtains the maximum brightness of the first light-emitting device in each region, which can reduce the number of times the maximum brightness of the first light-emitting device is obtained.

[0107] In some embodiments, the maximum brightness of the first light-emitting device in each of the m regions is obtained using a brightness testing device.

[0108] In some embodiments, determining the first target grayscale and brightness mapping relationship of the first light-emitting device based on the average brightness value of the maximum brightness of the first light-emitting device specifically includes:

[0109] S301. Determine whether the average brightness value L1 of the maximum brightness of the first light-emitting device is greater than or equal to L1min; where L1min is the preset minimum brightness value of the maximum brightness of the first light-emitting device.

[0110] S302. If so, and the average brightness L1 of the maximum brightness of the first light-emitting device satisfies: L1>L1max, then the gray-level and brightness mapping relationship corresponding to L1max is taken as the first target gray-level and brightness mapping relationship; where L1max is the preset maximum brightness value of the maximum brightness of the first light-emitting device.

[0111] S303. If so, and the average brightness L1 of the maximum brightness of the first light-emitting device satisfies: L1max≥L1≥L1min, then the preset grayscale and brightness mapping relationship is taken as the first target grayscale and brightness mapping relationship.

[0112] It should be noted that the maximum brightness of the first light-emitting device corresponds to a gray level of 255. In order to ensure the display effect, the brightness range of the 255 gray level needs to be greater than or equal to L1min and not exceed L1max. In the preset gray level and brightness mapping relationship, the brightness of the 255 gray level is greater than or equal to L1min and not exceed L1max.

[0113] It should be noted that if L1 is less than L1min, grayscale correction cannot be performed, and such display panels are considered defective products. In other words, only when L1 is greater than or equal to L1min are the display panels considered qualified products and can be grayscale corrected before being used by users.

[0114] The grayscale correction method for the display panel provided in this application corrects the grayscale mapping relationship between the maximum brightness of the first light-emitting device and the grayscale when L1≥L1min, so that the maximum brightness of the first light-emitting device is greater than or equal to L1min and does not exceed L1max, thus ensuring the display effect of the display panel.

[0115] In some embodiments, the control circuit pre-stores the grayscale and brightness mapping relationship corresponding to L1max and the preset grayscale and brightness mapping relationship, and stores the grayscale and brightness mapping relationship corresponding to L1max or the preset grayscale and brightness mapping relationship as the first target grayscale and brightness mapping relationship according to the numerical range of L1.

[0116] In some embodiments, such as Figure 6 As shown, the grayscale and brightness mapping relationship corresponding to L1max can be represented by the grayscale and brightness curve LM1. A preset grayscale and brightness mapping relationship can be, for example, the Gamma2.2 curve SL. The grayscale and brightness curve corresponding to L1min is LM2, and curve SL lies between curves LM1 and LM2.

[0117] In some embodiments, the grayscale compensation method for the display panel further includes: determining a first preset grayscale, specifically including:

[0118] S401. In the first display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are sequentially input so that the N light-emitting devices in the pixel are lit up under the drive of different first data signals, and the actual average brightness of the first light-emitting devices in m areas under different gray levels is obtained.

[0119] S402. In the second display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are sequentially input to light up the first light-emitting device, and the remaining light-emitting devices among the N light-emitting devices are turned off through the other data signal input circuit to obtain the actual average brightness of the first light-emitting device in m areas under different gray levels.

[0120] S403. The smallest gray level where the average actual brightness of the light-emitting device is different under the same gray level in the first display mode and the second display mode is taken as the first preset gray level.

[0121] It should be noted that in the first display mode, all N light-emitting devices are lit, and the current flowing through them is the same, resulting in identical brightness for each device. In the second display mode, only the first light-emitting device is lit, while the others are off. This means the brightness of the first device is greater than that of the second. When the Vds of the driving transistor in the first data signal input circuit is in the unsaturated region, the current input to the first device is affected. When the grayscale to be displayed is greater than the first preset grayscale, the brightness of the first device differs between the first and second display modes when the same first data signal is input. This leads to a mismatch between the actual brightness and the target brightness of the first device in the second mode. In the second display mode, when the target grayscale is less than or equal to the first preset grayscale, the mapping relationship between grayscale and brightness is the same as in the first display mode. However, when the target grayscale is greater than the first preset grayscale, the mapping relationship between grayscale and brightness differs from that in the first display mode. The first preset grayscale is the inflection point grayscale at which the mapping relationship between grayscale and brightness changes between the first and second display modes.

[0122] In some embodiments, a brightness testing device is used to obtain the average actual brightness of the first light-emitting device in m regions at different gray levels.

[0123] In some embodiments, the grayscale compensation method for the display panel further includes: establishing a second mapping relationship, specifically including:

[0124] S501. In the first display mode, obtain the actual brightness value of the first light-emitting device under k preset gray levels, and obtain the first gray level and brightness mapping relationship based on the k preset gray levels and the actual brightness value corresponding to the k preset gray levels; for example, obtain the first gray level and brightness curve by fitting based on the k preset gray levels and the actual brightness value corresponding to the k preset gray levels.

[0125] S502. In the second display mode, obtain the actual brightness value of the first light-emitting device under k preset gray levels, and obtain the second gray level and brightness mapping relationship based on the k preset gray levels and the actual brightness values ​​corresponding to the k preset gray levels; for example, obtain the second gray level and brightness curve by fitting the k preset gray levels and the actual brightness values ​​corresponding to the k preset gray levels.

[0126] S503. When the gray level is greater than the first preset gray level, determine the gray level difference between the first gray level and the brightness mapping relationship and the second gray level and the brightness mapping relationship under the same brightness, and determine the first compensation voltage for different gray levels based on the gray level difference, and take the mapping relationship between the first compensation voltage and the brightness as the second mapping relationship.

[0127] The grayscale compensation method for the display panel provided in this application determines a first compensation voltage for the first data signal based on the grayscale difference between the first grayscale mapping relationship and the second grayscale mapping relationship under the same brightness. The mapping relationship between the first compensation voltage and the brightness is used as the second mapping relationship. In this way, when the brightness of the first light-emitting device is greater than that of the second light-emitting device, and when the grayscale corresponding to the brightness of the first light-emitting device is greater than the first preset grayscale, the first data signal can be compensated according to the first compensation voltage. This avoids the inconsistency between the actual brightness of the first light-emitting device and the target brightness, improves the brightness accuracy of the first light-emitting device, and thus improves the display effect of the display panel.

[0128] In some embodiments, a brightness testing device is used to obtain the actual brightness value of the first light-emitting device under k preset gray levels.

[0129] In some embodiments, such as Figure 7 As shown, S3 is the grayscale brightness curve corresponding to the first grayscale and brightness mapping relationship, and S4 is the grayscale brightness curve corresponding to the second grayscale and brightness mapping relationship. For example, grayscale 255 in S3 and grayscale 200 in S4 have the same brightness, and the difference between the two grayscales is ΔL1. Based on ΔL1 and curves S3 and S4, the first compensation voltage ΔV1 corresponding to grayscale 255 and the first compensation voltage ΔV2 corresponding to grayscale 200 can be determined.

[0130] It should be noted that steps S401 to S403 are schemes where all pixels in the entire display panel share the same first preset grayscale. Correspondingly, steps S501 to S503 are the second mapping relationship obtained when all pixels in the entire display panel share the first preset grayscale.

[0131] Alternatively, in some embodiments, the grayscale compensation method for the display panel further includes: determining a first preset grayscale, specifically including:

[0132] S601. In the first display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are sequentially input so that the N light-emitting devices in the pixel are lit up under the drive of different first data signals, and the actual brightness values ​​of the first light-emitting devices in m areas under different gray levels are obtained.

[0133] S602. In the second display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are input sequentially to light up the first light-emitting device, and the remaining light-emitting devices among the N light-emitting devices are turned off through the other data signal input circuit to obtain the actual brightness value of the first light-emitting device in m areas under different gray levels.

[0134] S603. For any region among the m regions, the smallest gray level where the average actual brightness of the light-emitting device is different under the same gray level in the first display mode and the second display mode is taken as the first preset gray level of that region.

[0135] This means that different areas store a first preset grayscale level. The first preset grayscale levels corresponding to different areas may be the same, completely different, or not completely the same. This allows for partitioning and compensation of the display panel, further improving the brightness accuracy of each area of ​​the display panel and enhancing the display effect.

[0136] In some embodiments, a brightness testing device is used to obtain the actual brightness values ​​of the first light-emitting device in m regions at different gray levels.

[0137] In some embodiments, the grayscale compensation method for the display panel further includes: establishing a second mapping relationship, specifically including:

[0138] S701. In the first display mode, obtain the actual brightness value of the first light-emitting device in each of the m regions under k preset gray levels, and obtain the first gray level and brightness mapping relationship of each region in the m regions based on the k preset gray levels and the actual brightness values ​​corresponding to the k preset gray levels; for example, for any region in the m regions, obtain the first gray level and brightness curve of the region by fitting based on the k preset gray levels and the actual brightness values ​​corresponding to the k preset gray levels.

[0139] S702. In the second display mode, obtain the actual brightness value of the first light-emitting device in each of the m regions under k preset gray levels, and obtain the second gray level and brightness mapping relationship of each region in the m regions based on the k preset gray levels and the actual brightness values ​​corresponding to the k preset gray levels; for example, in any region of the m regions, obtain the second gray level and brightness curve of the region by fitting based on the k preset gray levels and the actual brightness values ​​corresponding to the k preset gray levels.

[0140] S703. For any region among the m regions, when the gray level is greater than the first preset gray level, determine the gray level difference between the mapping relationship between the first gray level and the brightness and the mapping relationship between the second gray level and the brightness under the same brightness, and determine the first compensation voltage for different gray levels based on the gray level difference, and take the mapping relationship between the first compensation voltage and the brightness as the second mapping relationship of the region.

[0141] The grayscale compensation method for the display panel provided in this application, for any region among m regions, determines the first compensation voltage of the first data signal based on the grayscale difference between the first grayscale mapping relationship and the second grayscale mapping relationship under the same brightness, and uses the mapping relationship between the first compensation voltage and the brightness as the second mapping relationship for that region. Thus, for each region, when the brightness of the first light-emitting device is greater than the brightness of the second light-emitting device, and when the grayscale corresponding to the brightness of the first light-emitting device is greater than the first preset grayscale, the first data signal can be compensated according to the first compensation voltage, avoiding inconsistency between the actual brightness of the first light-emitting device and the target brightness, improving the brightness accuracy of the first light-emitting device, and thereby improving the display effect of the display panel.

[0142] In some embodiments, a brightness testing device is used to obtain the actual brightness value of the first light-emitting device under k preset gray levels.

[0143] In some embodiments, after determining the brightness of each light-emitting device based on the image to be displayed, the method further includes:

[0144] Determine the region of the light-emitting device and determine the first preset gray level corresponding to the region.

[0145] In some embodiments, the first data signal input to the first data signal input circuit electrically connected to the pixel is compensated according to the first mapping relationship and the second mapping relationship, and the compensated first data signal is loaded onto the first data signal input circuit, specifically including:

[0146] For each region, the first data signal input to the first data signal input circuit electrically connected to the pixel is compensated according to the first mapping relationship and the second mapping relationship of the region, and the compensated first data signal is loaded onto the first data signal input circuit.

[0147] In some embodiments, a control circuit can be used to store a first preset grayscale and a second mapping relationship.

[0148] In some embodiments, the grayscale compensation method for the display panel further includes:

[0149] Light up the nth light-emitting device among the N light-emitting devices in each pixel to the maximum brightness, obtain the average brightness of the maximum brightness of the nth light-emitting device of all pixels, and determine the target grayscale and brightness mapping relationship of the nth light-emitting device based on the average brightness of the maximum brightness of the nth light-emitting device; where n is an integer greater than 1 and less than or equal to N;

[0150] Based on the preset negative data signal and grayscale mapping relationship corresponding to the nth light-emitting device, k negative data signals corresponding to k preset grayscales are selected and sequentially input to the nth data signal input circuit. No data signals are loaded to the other data signal input circuits outside the nth data signal input circuit. The actual brightness value of the nth light-emitting device under k preset grayscales is obtained in the first working mode. The nth data signal input circuit is a data signal input circuit electrically connected to the nth light-emitting device.

[0151] Based on the target grayscale and brightness mapping relationship of the nth light-emitting device, the target brightness value of the nth light-emitting device under k preset grayscale is obtained. Based on the relationship between the actual brightness value of the nth light-emitting device under k preset grayscale and the target brightness value of the nth light-emitting device under k preset grayscale in the first working mode, the data signal of the nth data signal input circuit is corrected to obtain the data signal correction value of the nth data signal input circuit under different grayscale in the first working mode. Based on the data signal correction value of the nth data signal input circuit under different grayscale in the first working mode, the corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the first working mode is obtained. The corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the first working mode is used as the third mapping relationship of the nth light-emitting device.

[0152] A first data signal is applied to the first data signal input circuit to illuminate the first light-emitting device and maintain a gray level of 255. According to the preset positive data signal and gray level mapping relationship corresponding to the nth light-emitting device, k positive data signals corresponding to k preset gray levels are selected and input to the nth data signal input circuit in sequence. No data signals are applied to the other data signal input circuits other than the first data signal input circuit and the nth data signal input circuit. The actual brightness value of the nth light-emitting device under k preset gray levels in the second working mode is obtained.

[0153] Based on the target grayscale and brightness mapping relationship of the nth light-emitting device, the target brightness value of the nth light-emitting device under k preset grayscales is obtained. Based on the relationship between the actual brightness value of the nth light-emitting device under k preset grayscales and the target brightness value of the nth light-emitting device under k preset grayscales in the second working mode, the data signal of the nth data signal input circuit is corrected to obtain the data signal correction value of the nth data signal input circuit under different grayscales in the second working mode. Based on the data signal correction value of the nth data signal input circuit under different grayscales in the second working mode, the corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the second working mode is obtained. The corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the second working mode is used as the fourth mapping relationship of the nth light-emitting device.

[0154] In practical implementation, it is necessary to obtain the third and fourth mapping relationships corresponding to the second to Nth light-emitting devices.

[0155] It should be noted that when n is an integer greater than 1 and less than or equal to N, if a negative data signal is input to the nth data signal input circuit and no data signal is loaded to the other data signal input circuits, then the nth data signal input circuit is in the first working mode, i.e., the current compensation mode, and the first to the (n-1)th light-emitting devices are off, while the nth to the Nth light-emitting devices are on.

[0156] When n is an integer greater than 1 and less than or equal to N, the first data signal is applied to the first data signal input circuit, causing the first light-emitting device to light up and maintain a gray level of 255. A positive data signal is input to the nth data signal input circuit, and no data signal is applied to the other data signal input circuits besides the first data signal input circuit and the nth data signal input circuit. Then the nth data signal input circuit is in the second working mode, i.e., the current pumping mode, and all N light-emitting devices are lit up.

[0157] In some embodiments, when n is an integer greater than 1 and less than or equal to N, the gray level corresponding to the maximum brightness of the nth light-emitting device is 255 gray levels.

[0158] In some embodiments, when n is an integer greater than 1 and less than or equal to N, the maximum brightness of the nth light-emitting device of all pixels is obtained using a brightness testing device, and the actual brightness value of the nth light-emitting device under k preset gray levels is obtained using a brightness testing device.

[0159] In some embodiments, a control circuit may be used to store a third mapping relationship and a fourth mapping relationship for each light-emitting device other than the first light-emitting device.

[0160] In some embodiments, obtaining the average brightness of the maximum brightness of the nth light-emitting device of all pixels specifically includes:

[0161] Obtain the maximum brightness of the nth light-emitting device in each of the m regions, and use the average of the maximum brightness of the m regions as the average brightness of the maximum brightness of the nth light-emitting device of all pixels.

[0162] When m=9, the maximum brightness of 9 regions is obtained, and the average of the 9 maximum brightness values ​​is taken as the average brightness value of the maximum brightness of the nth light-emitting device of all pixels.

[0163] In some embodiments, obtaining the maximum brightness of the nth light-emitting device in each of the m regions specifically includes:

[0164] For any region, the maximum brightness of the nth light-emitting device in that region is taken as the maximum brightness of the nth light-emitting device in that region.

[0165] For example, the maximum brightness of the nth light-emitting device at the center of each region can be obtained as the maximum brightness of the region.

[0166] In some embodiments, the maximum brightness of the nth light-emitting device in each of the m regions is obtained using a brightness testing device.

[0167] In some embodiments, determining the target grayscale and brightness mapping relationship of the nth light-emitting device based on the average brightness value of the maximum brightness of the nth light-emitting device specifically includes:

[0168] Determine whether the average brightness Ln of the maximum brightness of the nth light-emitting device is greater than or equal to Lnmin; where Lnmin is the preset minimum brightness value of the maximum brightness of the nth light-emitting device;

[0169] If so, and the average brightness Ln of the maximum brightness of the nth light-emitting device satisfies: Ln>Lnmax, then the grayscale and brightness mapping relationship corresponding to Lnmax is taken as the target grayscale and brightness mapping relationship of the nth light-emitting device; where Lnmax is the preset maximum brightness value of the maximum brightness of the nth light-emitting device.

[0170] If so, and the average brightness Ln of the maximum brightness of the nth light-emitting device satisfies: Lnmax≥Ln≥Lnmin, then the preset grayscale and brightness mapping relationship of the nth light-emitting device is taken as the target grayscale and brightness mapping relationship of the nth light-emitting device.

[0171] It should be noted that the gray scale corresponding to the maximum brightness of the n-th light-emitting device is the 255th gray scale. To ensure the display effect, the brightness range of the 255th gray scale needs to be greater than or equal to Lnmin and not exceed Lnmax, and the brightness of the 255th gray scale in the preset gray scale-brightness mapping relationship of the n-th light-emitting device is greater than or equal to Lnmin and not exceed Lnmax.

[0172] It should be noted that if Ln is less than Lnmin, gray scale correction cannot be performed, and such a display panel is an unqualified product. That is, only when Ln ≥ Lnmin, the display panel is a qualified product and can be used by a user after gray scale correction.

[0173] In the gray scale correction method for a display panel provided by the embodiments of the present application, when Ln ≥ Lnmin, the mapping relationship between the maximum brightness and the gray scale of the n-th light-emitting device is corrected, so that the maximum brightness of the n-th light-emitting device is greater than or equal to Lnmin and not exceed Lnmax, which can ensure the display effect of the display panel.

[0174] In some embodiments, the control circuit pre-stores the gray scale-brightness mapping relationship corresponding to Lnmax and the preset gray scale-brightness mapping relationship of the n-th light-emitting device, and stores the gray scale-brightness mapping relationship corresponding to Lnmax or the preset gray scale-brightness mapping relationship of the n-th light-emitting device as the target gray scale-brightness mapping relationship of the n-th light-emitting device according to the numerical range of Ln.

[0175] In some embodiments, after determining the brightness of each light-emitting device according to the picture to be displayed, the method further includes:

[0176] If the n-th data signal input circuit is in the first working mode, load a data signal to the n-th data signal input circuit according to the third mapping relationship; where n is an integer greater than 1 and less than or equal to N;

[0177] If the n-th data signal input circuit is in the second working mode, load a data signal to the n-th data signal input circuit according to the fourth mapping relationship; where n is an integer greater than 1 and less than or equal to N.

[0178] The gray scale compensation method provided by the embodiments of the present application further establishes the mapping relationships among data signals, gray scales and brightness corresponding to the remaining light-emitting devices except the first light-emitting device, so that the brightness of the remaining light-emitting devices can be compensated according to the above mapping relationships, the overall brightness accuracy of the display panel is improved, and the display effect is enhanced.

[0179] In specific implementation, for the 2nd to N-th light-emitting devices, it is necessary to load data signals to the n-th data signal input circuits according to the third mapping relationship or the fourth mapping relationship.

[0180] This application provides a display device, such as... Figure 8 As shown, the display device includes: a display panel 5 and a control circuit 6 bonded to the display panel 5;

[0181] The control circuit is used to execute the grayscale compensation method for the display panel provided in the embodiments of this application.

[0182] In some embodiments, such as Figure 8 As shown, the display panel 5 includes a display area AA and a peripheral area NA surrounding the display area AA. The peripheral area NA in the control circuit 6 is bound to the display panel 5.

[0183] In some embodiments, the control circuit is, for example, an integrated circuit chip.

[0184] In some embodiments, such as Figure 1 As shown, the display panel includes: multiple pixels 1 and multiple driving circuits 2; each pixel 1 includes N light-emitting devices 3, which are connected end to end and numbered sequentially according to the connection order; among the N light-emitting devices 3 connected end to end, the first electrode of the nth light-emitting device 30n is electrically connected to the second electrode of the (n+1)th light-emitting device 30n+1, where n is an integer greater than or equal to 1 and less than N, i.e., the N light-emitting devices 3 are connected in series; the multiple driving circuits 2 include multiple data signal input circuits 4, and the second electrode of each light-emitting device 3 is also configured to be connected to different data signal input circuits 4 respectively.

[0185] It should be noted that each pixel of the display panel provided in this application embodiment includes a light-emitting device, so that each pixel can emit light independently without the need for a backlight.

[0186] In some embodiments, a pixel includes a plurality of sub-pixels, and each sub-pixel includes at least one light-emitting device, i.e., a plurality of sub-pixels are connected in series.

[0187] In some embodiments, the multiple light-emitting devices included in a pixel may be light-emitting devices of the same color. The display panel also includes a color conversion structure that converts the light emitted by the light-emitting devices into light corresponding to the color emitted by the sub-pixel.

[0188] Alternatively, in some embodiments, different sub-pixels within a pixel may include light-emitting devices of different colors.

[0189] In some embodiments, the light-emitting device can be a light-emitting diode (LED), a mini light-emitting diode (Mini LED), or a micro light-emitting diode (Micro LED), etc. The main difference between LED, Mini LED, and Micro LED lies in their size. The planar size of LED is usually greater than 200 micrometers (μm), the planar size of Mini LED is usually between 50μm and 200μm, and the planar size of Micro LED is usually less than 50μm.

[0190] The display device provided in this application embodiment includes any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, and navigator. Other essential components of this display device are understood by those skilled in the art and will not be described in detail here, nor should they be construed as limiting this application.

[0191] In summary, the grayscale compensation method and display device for the display panel provided in this application, when the brightness of the first light-emitting device is greater than the brightness of the second light-emitting device, and when the grayscale corresponding to the brightness of the first light-emitting device is greater than the first preset grayscale, compensates the first data signal according to the first mapping relationship, i.e., the mapping relationship between the first data signal and the brightness, and the second mapping relationship, i.e., the mapping relationship between the first compensation voltage and the brightness. This can prevent the current output by the first data signal input circuit to the first light-emitting device from being affected by Vds, avoid the inconsistency between the actual brightness of the first light-emitting device and the target brightness, improve the brightness accuracy of the first light-emitting device, and thus improve the display effect of the display panel.

[0192] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0193] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A grayscale compensation method for a display panel, characterized in that, The display panel includes: multiple pixels and multiple driving circuits; each of the multiple pixels includes N light-emitting devices, the N light-emitting devices are connected end-to-end and numbered sequentially according to the connection order; among the N light-emitting devices, the first electrode of the nth light-emitting device is electrically connected to the second electrode of the (n+1)th light-emitting device, where n is an integer greater than or equal to 1 and less than N; the multiple driving circuits include multiple data signal input circuits, and the second electrode of each light-emitting device is further configured to be electrically connected to different data signal input circuits respectively; the method includes: The brightness of each of the light-emitting devices is determined according to the image to be displayed; Determine whether the brightness of the first light-emitting device among the N light-emitting devices in the pixel is greater than the brightness of the second light-emitting device, and the gray level corresponding to the brightness of the first light-emitting device is greater than the first preset gray level; If so, then according to the first mapping relationship and the second mapping relationship, the first data signal input to the first data signal input circuit electrically connected to the pixel is compensated, and the compensated first data signal is loaded onto the first data signal input circuit; the first data signal input circuit is the data signal input circuit electrically connected to the first light-emitting device; If not, then according to the first mapping relationship, the first data signal is loaded onto the first data signal input circuit electrically connected to the pixel; The first mapping relationship is the mapping relationship between the first data signal and the brightness; the second mapping relationship is the mapping relationship between the first compensation voltage and the brightness.

2. The method according to claim 1, characterized in that, The method further includes: establishing the first mapping relationship, specifically including: Light up the first of the N light-emitting devices in each pixel to its maximum brightness, obtain the average brightness of the maximum brightness of the first light-emitting device of all pixels, and determine the first target grayscale and brightness mapping relationship of the first light-emitting device based on the average brightness of the maximum brightness of the first light-emitting device. According to the preset mapping relationship between the first data signal and the gray level, select k preset gray levels and input the k first data signals to the first data signal input circuit in sequence. Do not load the data signals to the other data signal input circuits outside the first data signal input circuit, and obtain the actual brightness value of the first light-emitting device under the k preset gray levels. Based on the first target grayscale and brightness mapping relationship, target brightness values ​​at k preset grayscales are obtained. Based on the relationship between the actual brightness values ​​at the k preset grayscales and the target brightness values ​​at the k preset grayscales, the first data signal is corrected to obtain first data signal correction values ​​corresponding to different grayscales. Based on the first data signal correction values ​​corresponding to different grayscales, the corrected first data signal, grayscale, and brightness mapping relationship is obtained. The corrected first data signal, grayscale, and brightness mapping relationship is used as the first mapping relationship.

3. The method according to claim 2, characterized in that, The display panel includes a display area, and the plurality of pixels are located in the display area. The display area is divided into m regions with the same area. The average brightness of the maximum brightness of the first light-emitting device of all the pixels is obtained, specifically including: Obtain the maximum brightness of the first light-emitting device in each of the m regions, and use the average of the maximum brightness of the m regions as the average brightness of the maximum brightness of the first light-emitting device of all the pixels.

4. The method according to claim 2 or 3, characterized in that, The first target grayscale and brightness mapping relationship of the first light-emitting device is determined based on the average brightness value of the maximum brightness of the first light-emitting device, specifically including: Determine whether the average brightness value L1 of the maximum brightness of the first light-emitting device is greater than or equal to L1min; where L1min is a preset minimum brightness value of the maximum brightness of the first light-emitting device; If so, and the average brightness L1 of the maximum brightness of the first light-emitting device satisfies: L1>L1max, then the grayscale and brightness mapping relationship corresponding to L1max is taken as the first target grayscale and brightness mapping relationship; where L1max is the preset maximum brightness value of the maximum brightness of the first light-emitting device. If so, and the average brightness L1 of the maximum brightness of the first light-emitting device satisfies: L1max≥L1≥L1min, then the preset grayscale and brightness mapping relationship is taken as the first target grayscale and brightness mapping relationship.

5. The method according to claim 2, characterized in that, k=5, and the k preset gray levels are 64, 92, 128, 192, and 230 respectively.

6. The method according to claim 2, characterized in that, The method further includes: determining the first preset grayscale, specifically including: In the first display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are sequentially input so that the N light-emitting devices in the pixel are lit up under the drive of different first data signals, and the actual average brightness of the first light-emitting devices in the m regions under different gray levels is obtained. In the second display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are sequentially input to light up the first light-emitting device, and the remaining light-emitting devices among the N light-emitting devices are turned off through the other data signal input circuit to obtain the actual average brightness of the first light-emitting device in the m regions under different gray levels; The smallest gray level at which the average actual brightness of the light-emitting device differs under the same gray level in the first display mode and the second display mode is taken as the first preset gray level.

7. The method according to claim 6, characterized in that, The method further includes: establishing a second mapping relationship, specifically including: In the first display mode, the actual brightness value of the first light-emitting device under k preset gray levels is obtained, and the first gray level and brightness mapping relationship is obtained according to the k preset gray levels and the actual brightness value corresponding to the k preset gray levels. In the second display mode, the actual brightness value of the first light-emitting device under k preset gray levels is obtained, and the second gray level and brightness mapping relationship is obtained according to the k preset gray levels and the actual brightness value corresponding to the k preset gray levels. When the gray level is greater than the first preset gray level, the gray level difference between the first gray level and the brightness mapping relationship and the second gray level and the brightness mapping relationship under the same brightness is determined, and the first compensation voltage for different gray levels is determined according to the gray level difference, and the mapping relationship between the first compensation voltage and the brightness is used as the second mapping relationship.

8. The method according to claim 2, characterized in that, The method further includes: determining the first preset grayscale, specifically including: In the first display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are sequentially input so that the N light-emitting devices in the pixel are lit up under the drive of different first data signals, and the actual brightness values ​​of the first light-emitting devices in the m regions under different gray levels are obtained. In the second display mode, according to the first mapping relationship, the first data signals corresponding to different gray levels are sequentially input to light up the first light-emitting device, and the remaining light-emitting devices among the N light-emitting devices are controlled to turn off through the other data signal input circuit, so as to obtain the actual brightness value of the first light-emitting device in the m regions under different gray levels. For any of the m regions, the smallest gray level where the average actual brightness of the light-emitting device is different under the same gray level in the first display mode and the second display mode is taken as the first preset gray level of the region.

9. The method according to claim 8, characterized in that, The method further includes: establishing a second mapping relationship, specifically including: In the first display mode, the actual brightness value of the first light-emitting device in each of the m regions under k preset gray levels is obtained, and the first gray level and brightness mapping relationship of each of the m regions is obtained according to the k preset gray levels and the actual brightness value corresponding to the k preset gray levels. In the second display mode, the actual brightness value of the first light-emitting device in each of the m regions under k preset gray levels is obtained, and the second gray level and brightness mapping relationship of each of the m regions is obtained according to the k preset gray levels and the actual brightness value corresponding to the k preset gray levels; For any of the m regions, when the gray level is greater than the first preset gray level, the gray level difference between the first gray level and the brightness mapping relationship and the second gray level and the brightness mapping relationship under the same brightness is determined, and the first compensation voltage for different gray levels is determined according to the gray level difference, and the mapping relationship between the first compensation voltage and the brightness is used as the second mapping relationship of the region.

10. The method according to claim 8 or 9, characterized in that, After determining the brightness of each light-emitting device based on the image to be displayed, the method further includes: The region of the light-emitting device is determined, and the first preset gray level corresponding to the region is determined.

11. The method according to any one of claims 2-3 and 5-8, characterized in that, The method further includes: Light up the nth light-emitting device among the N light-emitting devices in each pixel to its maximum brightness, obtain the average brightness of the maximum brightness of the nth light-emitting device of all pixels, and determine the target grayscale and brightness mapping relationship of the nth light-emitting device based on the average brightness of the maximum brightness of the nth light-emitting device; where n is an integer greater than 1 and less than or equal to N; Based on the preset negative data signal and grayscale mapping relationship corresponding to the nth light-emitting device, k negative data signals corresponding to k preset grayscales are selected and sequentially input to the nth data signal input circuit. The data signals are not loaded onto the other data signal input circuits besides the nth data signal input circuit. This allows for the acquisition of the actual brightness value of the nth light-emitting device under the k preset grayscales in the first operating mode. The nth data signal input circuit is the data signal input circuit electrically connected to the nth light-emitting device. Based on the target grayscale and brightness mapping relationship of the nth light-emitting device, the target brightness value of the nth light-emitting device under k preset grayscales is obtained. Based on the relationship between the actual brightness value of the nth light-emitting device under the k preset grayscales in the first working mode and the target brightness value of the nth light-emitting device under the k preset grayscales, the data signal of the nth data signal input circuit is corrected to obtain the data signal correction value of the nth data signal input circuit under different grayscales in the first working mode. Based on the data signal correction value of the nth data signal input circuit under different grayscales in the first working mode, the corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the first working mode is obtained. The corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the first working mode is used as the third mapping relationship of the nth light-emitting device. The first data signal is loaded onto the first data signal input circuit, causing the first light-emitting device to light up and maintain a gray level of 255. According to the preset positive data signal and gray level mapping relationship corresponding to the nth light-emitting device, k positive data signals corresponding to k preset gray levels are selected and sequentially input onto the nth data signal input circuit. The data signals are not loaded onto the other data signal input circuits besides the first data signal input circuit and the nth data signal input circuit. The actual brightness value of the nth light-emitting device under the k preset gray levels in the second working mode is obtained. Based on the target grayscale and brightness mapping relationship of the nth light-emitting device, the target brightness value of the nth light-emitting device under k preset grayscales is obtained. Based on the relationship between the actual brightness value of the nth light-emitting device under the k preset grayscales in the second working mode and the target brightness value of the nth light-emitting device under the k preset grayscales, the data signal of the nth data signal input circuit is corrected to obtain the data signal correction value of the nth data signal input circuit under different grayscales in the second working mode. Based on the data signal correction value of the nth data signal input circuit under different grayscales in the second working mode, the corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the second working mode is obtained. The corrected data signal, grayscale, and brightness mapping relationship of the nth data signal input circuit under the second working mode is used as the fourth mapping relationship of the nth light-emitting device.

12. The method according to claim 11, characterized in that, After determining the brightness of each light-emitting device based on the image to be displayed, the method further includes: If the nth data signal input circuit is in the first operating mode, then according to the third mapping relationship, the data signal is loaded onto the nth data signal input circuit; where n is an integer greater than 1 and less than or equal to N; If the nth data signal input circuit is in the second working mode, then according to the fourth mapping relationship, the data signal is loaded onto the nth data signal input circuit; where n is an integer greater than 1 and less than or equal to N.

13. The method according to any one of claims 2-3, 5-9, and 12, characterized in that, N＝3。 14. The method according to any one of claims 2-3, 5-9, and 12, characterized in that, The method further includes: obtaining the brightness of the light-emitting device using a brightness testing device.

15. A display device, characterized in that, The display device includes: a display panel and a control circuit bound to the display panel; The display panel includes: multiple pixels and multiple driving circuits; each of the multiple pixels includes N light-emitting devices, which are connected end-to-end and numbered sequentially according to the connection order; among the N light-emitting devices, the first electrode of the nth light-emitting device is electrically connected to the second electrode of the (n+1)th light-emitting device, where n is an integer greater than or equal to 1 and less than N; the multiple driving circuits include multiple data signal input circuits, and the second electrode of each light-emitting device is further configured to be electrically connected to different data signal input circuits respectively; The control circuit is used to perform the grayscale compensation method according to any one of claims 1 to 14.

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