Compensation method, compensation device and display device of display panel

Abstract

The application discloses a compensation method, a compensation device and a display device of a display panel. The display panel comprises a plurality of pixel groups, each of the pixel groups comprises at least one sub-pixel, a first end of the plurality of pixel groups is electrically connected with a first power voltage input end, and a second end of the plurality of pixel groups is electrically connected with a second power voltage input end. The compensation method of the display panel comprises the following steps: determining a compensation intermediate value of the pixel groups under a current display picture; wherein the compensation intermediate value comprises a total current of the plurality of pixel groups or a parallel resistance of the plurality of pixel groups; and determining a compensation value of each pixel group according to the compensation intermediate value. The embodiment of the application can improve the picture display quality of the display panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a compensation method, a compensation device and a display device of a display panel. BACKGROUND

[0002] With the development of display technology, people have higher and higher requirements on the display quality of display panel, however, the existing display panel has brightness variation when displaying different pictures, which affects the picture display quality. SUMMARY

[0003] The present application provides a compensation method, a compensation device and a display device of a display panel to improve the picture display quality of the display panel.

[0004] According to an aspect of the present application, a compensation method of a display panel is provided, the display panel comprising a plurality of pixel groups, each of the pixel groups comprising at least one sub-pixel, a first end of the plurality of pixel groups being electrically connected to a first power voltage input end, and a second end of the plurality of pixel groups being electrically connected to a second power voltage input end.

[0005] The compensation method of the display panel comprises:

[0006] determining a compensation intermediate value of the pixel groups under a current display picture, wherein the compensation intermediate value comprises a total current of the plurality of pixel groups or a parallel resistance of the plurality of pixel groups;

[0007] determining a compensation value of each of the pixel groups according to the compensation intermediate value.

[0008] Optionally, determining the compensation value of each of the pixel groups according to the compensation intermediate value comprises:

[0009] determining the compensation value of each of the pixel groups according to the compensation intermediate value and a pre-stored corresponding relationship between the compensation intermediate value and the compensation value.

[0010] Optionally, determining the compensation value of each of the pixel groups according to the compensation intermediate value and the pre-stored corresponding relationship between the compensation intermediate value and the compensation value comprises:

[0011] determining the compensation value of each of the pixel groups by an interpolation algorithm according to the compensation intermediate value and a pre-stored corresponding relationship table, wherein the corresponding relationship table is a corresponding relationship table between the compensation intermediate value and the compensation value.

[0012] Optionally, the corresponding relationship table comprises compensation intermediate values and compensation values corresponding to at least two different display brightness levels, and the same display brightness level comprises at least two different compensation intermediate values and the compensation values corresponding to the at least two different compensation intermediate values.

[0013] Optionally, the compensation value of each pixel group is determined according to the compensation intermediate value and a pre-stored corresponding relation table by an interpolation algorithm, and the method comprises the steps of:

[0014] If the first display brightness level corresponding to the current display image is included in the corresponding relation table, and the compensation intermediate value corresponding to the current display image is not included in the corresponding relation table, then the compensation values of the pixel groups in the current display image are determined by interpolation according to the two compensation intermediate values and the corresponding compensation values closest to the compensation intermediate value under the first display brightness level in the corresponding relation table.

[0015] If the first display brightness level corresponding to the current display image is not included in the corresponding relation table, then the compensation values of the pixel groups in the current display image are determined by interpolation according to the compensation intermediate values and the corresponding compensation values corresponding to the second display brightness level and the third display brightness level closest to the first display brightness level in the corresponding relation table.

[0016] Optionally, the compensation value of each pixel group is determined according to the compensation intermediate value, and the method comprises the steps of:

[0017] The parallel resistance of the plurality of pixel groups in the current image is determined according to the total current.

[0018] The parallel voltage across the pixel groups is determined according to the parallel resistance and the first resistance; wherein the first resistance is the resistance between the first end of the plurality of pixel groups and the first power voltage input end.

[0019] The compensation value of the i-th pixel group is determined according to the parallel voltage and the i-th voltage; wherein the plurality of pixel groups comprise at least one first pixel group, at least one second pixel group, at least one (n-1)-th pixel group, and at least one n-th pixel group; wherein n is a positive integer greater than or equal to 2, the first pixel group displays the first gray scale, the second pixel group displays the second gray scale, the (n-1)-th pixel group displays the (n-1)-th gray scale, and the n-th pixel group displays the n-th gray scale in the current display image; i is sequentially 1, 2, …, n-1, and n; and the i-th voltage is the voltage across the pixel groups when the plurality of pixel groups display the i-th gray scale.

[0020] Optionally, the compensation value of the i-th pixel group is determined according to the parallel voltage and the i-th voltage, and the method comprises the steps of:

[0021] The pixel brightness change rate of the i-th pixel group is determined according to the parallel voltage and the i-th voltage; wherein the pixel brightness change rate of the i-th pixel group is the ratio of the current brightness of the i-th pixel group to the i-th brightness; the current brightness is the display brightness of the i-th pixel group when the display panel displays the current display image; and the i-th brightness is the brightness of the i-th pixel group when the plurality of pixel groups display the i-th gray scale.

[0022] determining the compensation value of the i-th pixel group according to the luminance change rate of the pixel group;

[0023] Preferably, the luminance change rate of the i-th pixel group is Real ELVDD_U is a parallel voltage, and Real ELVDD_Ui is the i-th voltage.

[0024] Optionally, each of the pixel groups comprises at least three sub-pixels of different light-emitting colors; after the compensation value of each of the pixel groups is determined according to the compensation intermediate value, the method further comprises: determining the compensation value of each sub-pixel in each of the pixel groups according to the compensation value of each of the pixel groups; or, the display panel comprises at least three sub-pixels of different light-emitting colors, and each of the pixel groups comprises one sub-pixel; a first end of a plurality of pixel groups comprising sub-pixels of the same light-emitting color is connected to a same first power voltage input end, and a second end of the plurality of pixel groups comprising sub-pixels of the same light-emitting color is connected to a same second power voltage input end; a pixel group comprising sub-pixels of different light-emitting colors is connected to different first power voltage input ends and second power voltage input ends; and determining the compensation intermediate value of the pixel group under the current display picture comprises:

[0025] determining the compensation intermediate value of the plurality of pixel groups comprising sub-pixels of the same light-emitting color according to the current display picture;

[0026] determining the compensation value of each of the pixel groups according to the compensation intermediate value comprises:

[0027] determining the compensation value of the sub-pixel of the same light-emitting color according to the compensation intermediate value of the plurality of pixel groups comprising sub-pixels of the same light-emitting color.

[0028] Optionally, all sub-pixels of the same light-emitting color in the display panel are connected to a same first power voltage input end, all sub-pixels of the same light-emitting color are connected to a same second power voltage input end, and sub-pixels of different light-emitting colors are connected to different first power voltage input ends and second power voltage input ends.

[0029] Optionally, determining the compensation intermediate value of the pixel group under the current display picture comprises:

[0030] determining an i-th total output current output by all i-th pixel units, and determining a total current of the plurality of pixel units according to the first total output current, the second total output current, the (n-1)-th total output current, and the n-th total output current; wherein the plurality of pixel units comprises at least one first pixel unit, at least one second pixel unit, at least one (n-1)-th pixel unit, and at least one n-th pixel unit; wherein n is a positive integer greater than or equal to 2, the first pixel unit displays a first gray scale, the second pixel unit displays a second gray scale, the (n-1)-th pixel unit displays an (n-1)-th gray scale, and the n-th pixel unit displays an n-th gray scale in the current display frame; i is 1, 2, …, n-1, and n in turn, and the i-th voltage is a voltage across the pixel units when the plurality of pixel units display an i-th gray scale;

[0031] determining a parallel resistance of the plurality of pixel units in the current frame according to the total current.

[0032] Optionally, determining the i-th total output current output by all i-th pixel units, and determining the total current of the plurality of pixel units according to the first total output current, the second total output current, the (n-1)-th total output current, and the n-th total output current comprises:

[0033] determining the i-th total output current of all i-th pixel units according to the following formula:

[0034] pixel_unit_Ii=K*pixel_unit_I*(Grayi / Gray255) Gamma *ratioi; wherein,

[0035] Grayi is an i-th gray scale, pixel_unit_Ii is an i-th total output current of all i-th pixel units, ratioi is a proportion of all i-th pixel units in the plurality of pixel units, pixel_unit_I is a total output current when the plurality of pixel units display a 255 gray scale, K is a coefficient, and Gamma is a gamma value.

[0036] adding the first total output current, the second total output current, the (n-1)-th total output current, and the n-th total output current to obtain the total current of the plurality of pixel units.

[0037] Optionally, determining the current parallel resistance of the plurality of pixel units in the current display frame according to the total current comprises:

[0038] determining the current parallel resistance according to the following formula:

[0039] Rx=(Real ELVDD_U1) / (pixel_unit_I); wherein, Rx is the current parallel resistance, Real ELVDD_U1 is the voltage across the pixel groups when the pixel groups display the same preset gray scale, and pixel_unit_I is the total current.

[0040] Optionally, before determining the compensation intermediate value of the pixel group in the current display picture, the method further comprises:

[0041] determining a first compensation intermediate value and a first compensation value of the pixel group when the display panel displays a first preset picture at a first preset display brightness level;

[0042] determining a second compensation intermediate value and a second compensation value of the pixel group when the display panel displays a second preset picture at the first preset display brightness level; wherein, the gray scales displayed by at least part of the pixel groups in the first preset picture and the second preset picture are different, and the second preset picture is different from the first preset picture;

[0043] determining a third compensation intermediate value and a third compensation value of the pixel group when the display panel displays a third preset picture at a second preset display brightness level;

[0044] determining a fourth compensation intermediate value and a fourth compensation value of the pixel group when the display panel displays a fourth preset picture at the second preset display brightness level; wherein, the gray scales displayed by at least part of the pixel groups in the third preset picture and the fourth preset picture are different, and the third preset picture is different from the fourth preset picture;

[0045] determining a corresponding relationship between the compensation intermediate value and the compensation value according to the first compensation intermediate value, the first compensation value, the second compensation intermediate value, the second compensation value, the third compensation intermediate value, the third compensation value, the fourth compensation intermediate value, and the fourth compensation value, and storing the corresponding relationship in the display panel.

[0046] Optionally, determining the first compensation intermediate value and the first compensation value of the pixel group when the display panel displays the first preset picture at the first preset display brightness level comprises:

[0047] determining a first resistance between the first end of the plurality of pixel groups and the first power voltage input end, and a jth parallel resistance of the plurality of pixel groups when the plurality of pixel groups display a jth gray scale; wherein, j is a positive integer, j takes 1, 2, …, m-1 and m in turn, m is a positive integer greater than or equal to 2, m is the number of different gray scales in the first preset display picture, and a jth pixel group in the display panel displays a jth gray scale.

[0048] determining a jth voltage across the plurality of pixel groups when the plurality of pixel groups display a jth gray scale according to the first resistance and the jth parallel resistance;

[0049] determining a jth output current output by all the jth pixel groups when the display panel displays a first preset picture at a first preset display brightness level, and determining a first total current of the plurality of pixel groups according to the first output current, a second output current, a (m-1)th output current and a mth output current;

[0050] determining a preset parallel resistance of the plurality of pixel groups at the first preset picture according to the first total current;

[0051] determining a preset parallel voltage across the plurality of pixel groups according to the preset parallel resistance and the first resistance;

[0052] determining a first compensation value of the jth pixel group according to the preset parallel voltage and a jth voltage; wherein the jth voltage is a voltage across the plurality of pixel groups when the plurality of pixel groups display a jth gray scale.

[0053] Optionally, determining the first compensation value of the jth pixel group according to the preset parallel voltage and the jth voltage comprises:

[0054] determining a pixel brightness variation rate of the jth pixel group according to the preset parallel voltage and the jth voltage; wherein the pixel brightness variation rate of the jth pixel group is a ratio of a current brightness of the jth pixel group to a jth brightness; the current brightness is a display brightness of the jth pixel group when the display panel displays the first preset display picture; and the jth brightness is a brightness of the jth pixel group when the plurality of pixel groups display the jth gray scale.

[0055] determining the first compensation value of the jth pixel group according to the pixel brightness variation rate.

[0056] Optionally, the pixel brightness variation rate of the jth pixel group is

[0057] Real ELVDD_U 2 is the preset parallel voltage, and Real ELVDD_U j is the jth voltage.

[0058] Optionally, the method further comprises:

[0059] determining the jth voltage according to the following formula:

[0060] wherein Real ELVDD_U j is the jth voltage, R0 is the first resistance, Rj is the jth parallel resistance, ΔV is a difference between a first power voltage and a second power voltage, the first power voltage is a voltage input by a first power voltage input end, and the second power voltage is a voltage input by a second power voltage input end.

[0061] determining the preset parallel voltage across the plurality of pixel groups according to the preset parallel resistance and the first resistance comprises:

[0062] wherein, Rx1 is a preset parallel resistance.

[0063] According to another aspect of the present application, there is provided a compensation device of a display panel, the display panel comprising a plurality of pixel groups, each of the pixel groups comprising at least one sub-pixel, a first end of the plurality of pixel groups being electrically connected to a first power voltage input end, and a second end of the plurality of pixel groups being electrically connected to a second power voltage input end.

[0064] The compensation device of the display panel comprises:

[0065] a compensation intermediate value determining module, configured to determine a compensation intermediate value of the pixel groups under a current display picture, wherein the compensation intermediate value comprises a total current of the plurality of pixel groups or a parallel resistance of the plurality of pixel groups;

[0066] a compensation value determining module, configured to determine a compensation value of each of the pixel groups according to the compensation intermediate value.

[0067] According to another aspect of the present application, there is provided a display device comprising the compensation device of the display panel according to any of the embodiments of the present application.

[0068] The embodiments of the present application determine a compensation intermediate value of the pixel groups under a current display picture, wherein the compensation intermediate value comprises a total current of the pixel groups connected to the same first power voltage input end and the same second power voltage input end or all parallel resistances, and then determine a compensation value of each of the pixel groups according to the compensation intermediate value. The total current and the parallel resistance can both reflect the load condition of the display panel under the current display picture, and both the total current and the parallel resistance have a certain relationship with the brightness change of the sub-pixel. The compensation value determined according to the total current or the parallel resistance can better compensate the brightness change of the pixel groups, improve the display brightness change caused by the display picture change, and improve the picture display quality of the display panel.

[0069] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative effort.

[0071] Figure 1 is a schematic diagram of a display panel provided by the embodiments of the present application;

[0072] Figure 2 is a circuit equivalent diagram of a group of sub-pixels in a display panel;

[0073] Figure 3 is a schematic diagram of a compensation method of a display panel provided by an embodiment of the present application;

[0074] Figure 4 is an equivalent circuit diagram of a sub-pixel;

[0075] Figure 5 is a flow chart of another compensation method of a display panel provided by an embodiment of the present application;

[0076] Figure 6 is an equivalent diagram of a display panel provided by an embodiment of the present application;

[0077] Figure 7 is a flow chart of another compensation method of a display panel provided by an embodiment of the present application;

[0078] Figure 8 is a schematic diagram of a compensation device of a display panel provided by an embodiment of the present application;

[0079] Figure 9 is a schematic diagram of a display device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0080] In order to make the personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person of ordinary skill in the art without creative labor should belong to the protection scope of the present application.

[0081] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0082] As mentioned in the background, the existing display panel has brightness variation when displaying different pictures, the inventors found that the reason for this problem is that: Figure 1 is a schematic diagram of a display panel provided by an embodiment of the present application, Figure 2 is a circuit equivalent diagram of a group of sub-pixels in the display panel, referring to Figure 1 and Figure 2 , in the existing display panel, the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B are connected to the same first power voltage input end and the same second power voltage input end, that is, the red sub-pixel, the green sub-pixel and the blue sub-pixel are connected in parallel. Referring to Figure 2 , the first power voltage input end is used to input the first power voltage ELVDD, the second power voltage input end is used to input the second power voltage ELVSS, and the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B are connected in parallel. R0 is the resistance on the connection path between the sub-pixel and the first power voltage input end, R1 is the equivalent resistance of the red sub-pixel, R2 is the equivalent resistance of the green sub-pixel, R3 is the equivalent resistance of the blue sub-pixel, I1 is the current flowing through the red sub-pixel, I2 is the current flowing through the green sub-pixel, and I3 is the current flowing through the blue sub-pixel. When the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B are all turned on, based on the characteristics of the parallel circuit, the total current I = I1 + I2 + I3, and the parallel resistance R 并 of the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B satisfies the following relationship, 1 / R 并 = 1 / R1 + 1 / R2 + 1 / R3. When the blue sub-pixel B is turned off, R 并 changes, the load changes, the influence of R3 disappears, R 并 increases, I decreases, the voltage division of R0 becomes smaller, the voltage division of R 并 increases, and the picture brightness becomes brighter. Therefore, in the existing display panel, when the display gray scale of any color sub-pixel changes, it will affect the parallel resistance of each sub-pixel in the panel, the actual power voltage of each sub-pixel brightness, the display brightness of other sub-pixels, resulting in different display brightness of the same gray scale of the sub-pixel in different pictures, and affecting the display picture quality.

[0083] Based on the above problems, the present application provides a compensation method for a display panel, referring to Figure 1 , the display panel comprises a plurality of pixel groups 01, each pixel group 01 comprising at least one sub-pixel, the first end of the plurality of pixel groups 01 being electrically connected to the first power voltage input end, and the second end of the plurality of pixel groups 01 being electrically connected to the second power voltage input end.

[0084] Figure 3 is a schematic diagram of a compensation method for a display panel provided by an embodiment of the present application, referring to Figure 3The compensation method of the display panel comprises the following steps:

[0085] S110, determining a compensation intermediate value of the pixel group under the current display picture; wherein the compensation intermediate value comprises a total current of the plurality of pixel groups or a parallel resistance of the plurality of pixel groups.

[0086] The current display picture is a picture that the display panel currently needs to display. Each pixel group contains the same sub-pixel. For example, each pixel group can include a red sub-pixel, or each pixel group includes a green sub-pixel, or each pixel group includes a blue sub-pixel, or each pixel group can include a red sub-pixel, a green sub-pixel and a blue sub-pixel. The plurality of pixel groups are all pixel groups connected to the same first power voltage input terminal and the same second power voltage input terminal. The plurality of pixel groups can be all pixel groups in the display panel, or can be pixel groups in a partial region. For example, the display panel can include two or more sub-regions, each sub-region including a plurality of pixel groups, the first end of the plurality of pixel groups in each sub-region being electrically connected to the first power voltage input terminal, and the second end of the plurality of pixel groups in each sub-region being electrically connected to the second power voltage input terminal. When different sub-regions are connected to different first power voltage input terminals and different second power voltage input terminals, the compensation intermediate value of each sub-region is determined, and the compensation value of the plurality of pixel groups in the sub-region is determined according to the compensation intermediate value of each sub-region.

[0087] Specifically, the display gray scale of each pixel group can be determined according to the current display picture, the output current of each pixel group can be determined according to the display gray scale, and the total current of the plurality of pixel groups can be obtained by adding the output currents of the plurality of pixel groups. The parallel resistance of the plurality of pixel groups can also be calculated according to the total current. Since the voltage change between the two ends of the pixel group is small, the voltage between the two ends of the pixel group when the plurality of pixel groups display the same gray scale is determined in advance, and the approximate value of the parallel resistance is obtained according to the ratio of the voltage to the total current. The approximate value is determined as the parallel resistance. When the display picture changes, the total current and the parallel resistance will change accordingly, and both the total current and the parallel resistance can reflect the load change of the display panel.

[0088] When each pixel group includes a red sub-pixel, the compensation intermediate value of the pixel group including the red sub-pixel can be determined according to the gray scale of the red sub-pixel in the current display picture. When each pixel group includes a green sub-pixel, the compensation intermediate value of the pixel group including the green sub-pixel can be determined according to the gray scale of the green sub-pixel in the current display picture. When each pixel group includes a blue sub-pixel, the compensation intermediate value of the pixel group including the blue sub-pixel can be determined according to the gray scale of the blue sub-pixel in the current display picture.

[0089] S120, determining a compensation value of each pixel group according to the compensation intermediate value.

[0090] Figure 4 is an equivalent circuit diagram of a sub-pixel, referring to Figure 4 , Cst is a storage capacitor, T2 is a driving transistor, OLED is an organic light emitting diode, V1 is a voltage of a first power supply voltage divided to the sub-pixel, including VDS and Voled, VDS is a voltage difference between source and drain of the driving transistor, Voled is a voltage between two terminals of the organic light emitting diode. Under the same driving voltage Vdata, Volde and VDS are both regarded as equivalent resistance division, Volde∝Real ELVDD_U, then: sub-pixel brightness Lum∝Volde 2 ∝(Real ELVDD_U-VDS) 2 ∝Real ELVDD_U 2 , wherein Real ELVDD_U is a voltage between two terminals of a pixel group, i.e. the sum of Voled and VDS.

[0091] and, , wherein Rx is a parallel resistance of a plurality of pixel groups, R0 is a resistance between a first power supply voltage input terminal and the pixel group, and ΔV is a difference between the first power supply voltage and a second power supply voltage. Therefore, the total current of the sub-pixel and the parallel resistance Rx have a certain relationship with the brightness Lum of the pixel group. When the display picture changes, the total current and the parallel resistance can both reflect the load change of the display panel, and the brightness change can be determined according to the total current and the parallel resistance, so that the compensation value can be determined.

[0092] Therefore, the corresponding relationship between the compensation intermediate value and the compensation value can be determined in advance, the corresponding relationship between the compensation intermediate value and the compensation value is stored in the display panel in advance, and the compensation value of each pixel group can be determined according to the compensation intermediate value under the current display picture, in combination with the stored corresponding relationship between the compensation intermediate value and the compensation value. In addition, the compensation value of the pixel group can also be calculated according to the compensation intermediate value.

[0093] In addition, the compensation value can be a compensation gray scale value, a compensation voltage value or a compensation gain coefficient, etc., which is not specifically limited in the present embodiment. When each pixel group includes one sub-pixel, the compensation value of the sub-pixel can be directly determined according to the compensation intermediate value, when each pixel group includes two or more sub-pixels of different light emitting colors, the compensation value of each sub-pixel can be determined according to the compensation intermediate value and the brightness and chroma relationship of the at least three different light emitting color sub-pixels, or the compensation value of the pixel group can be first determined according to the compensation intermediate value, and then the compensation value of each sub-pixel can be determined according to the compensation value of the pixel group and the brightness and chroma relationship of the different light emitting color sub-pixels.

[0094] The embodiment of the present application determines a compensation intermediate value of a pixel group in a current display picture, wherein the compensation intermediate value comprises a total current or a parallel resistance of the pixel group connected to the same first power voltage input terminal and the same second power voltage input terminal; and then determines a compensation value of each pixel group according to the compensation intermediate value. The total current and the parallel resistance can both reflect the load condition of the display panel in the current display picture, and the total current and the parallel resistance both have a certain relationship with the brightness change of the sub-pixel. The compensation value determined according to the total current or the parallel resistance can better compensate the brightness change of the pixel group, improve the display brightness change caused by the display picture change, and improve the picture display quality of the display panel.

[0095] Optionally, the compensation value of each pixel group is determined according to the compensation intermediate value, comprising:

[0096] The compensation value of each pixel group is determined according to the compensation intermediate value and a corresponding relationship between the compensation intermediate value and the compensation value stored in advance.

[0097] Specifically, the corresponding relationship between the compensation intermediate value and the compensation value can be a corresponding relationship table or a corresponding relationship function. By storing the corresponding relationship between the compensation intermediate value and the compensation value in the display panel in advance, the compensation value of the pixel group can be quickly determined according to the compensation intermediate value, and the compensation speed is improved.

[0098] Optionally, the compensation value of each pixel group is determined according to the compensation intermediate value and the corresponding relationship between the compensation intermediate value and the compensation value stored in advance, comprising:

[0099] The compensation value of each pixel group is determined according to the compensation intermediate value and the corresponding relationship table stored in advance by an interpolation algorithm; wherein the corresponding relationship table is a corresponding relationship table between the compensation intermediate value and the compensation value.

[0100] Specifically, the interpolation can be linear interpolation or nonlinear interpolation. The compensation value is determined more quickly by the table lookup and interpolation, and the compensation speed is improved.

[0101] Optionally, the corresponding relationship table comprises compensation intermediate values and compensation values corresponding to at least two different display brightness levels, and the same display brightness level comprises at least two different compensation intermediate values and compensation values corresponding to the at least two different compensation intermediate values.

[0102] Specifically, the display brightness level, namely DBV, the display panel can include a plurality of different display brightness levels. Under different display brightness levels, the maximum display brightness of the display panel is different, and the minimum display brightness is the same, for example, the minimum display brightness can be 0 nit, and the maximum display brightness can be 2 nit, 10 nit, 50 nit, 100 nit, 200 nit, 500 nit, 600 nit, 800 nit or 1000 nit, etc. Under each display brightness level, the display panel can display 0 gray scale to 2 t -1 gray scale, for example, can display 0-255 gray scale.

[0103] After determining the compensation intermediate value corresponding to the current display picture, it can be found in the correspondence table whether the display brightness level corresponding to the current display picture is included. When the display brightness level corresponding to the current display picture is included in the correspondence table, and the corresponding compensation intermediate value, the compensation value of each pixel group can be directly determined according to the compensation value corresponding to the compensation intermediate value.

[0104] For example, the current display picture adopts the first display brightness level, the current display picture includes two gray scales, part of the pixel groups display the first gray scale, and part of the pixel groups display the second gray scale. The calculated compensation intermediate value is a. The correspondence table includes the first display brightness level, and the first display brightness level includes the first gray scale compensation value (the compensation value corresponding to the first gray scale) and the second gray scale compensation value (the compensation value corresponding to the second gray scale) corresponding to the intermediate value a. Then the first gray scale compensation value is directly used as the compensation value of the pixel group displaying the first gray scale, and the second gray scale compensation value is directly used as the compensation value of the pixel group displaying the second gray scale. If the correspondence table includes the first display brightness level, and the first display brightness level includes the third gray scale compensation value (the compensation value corresponding to the third gray scale) and the fourth gray scale compensation value (the compensation value corresponding to the fourth gray scale) corresponding to the intermediate value a, the compensation value of the pixel group displaying the first gray scale and the compensation value of the pixel group displaying the second gray scale are obtained by interpolation according to the third gray scale compensation value and the fourth gray scale compensation value.

[0105] Optionally, according to the compensation intermediate value and the pre-stored correspondence table, the compensation value of each pixel group is determined by an interpolation algorithm, including:

[0106] If the correspondence table includes the first display brightness level corresponding to the current display picture, and does not include the compensation intermediate value corresponding to the current display picture, the compensation values of the pixel groups under the current display picture are determined by interpolation according to the two compensation intermediate values closest to the compensation intermediate value and the corresponding compensation values under the first display brightness level in the correspondence table;

[0107] If the first display brightness level corresponding to the current display picture is not included in the correspondence table, the compensation values of the pixel groups in the current display picture are determined by interpolation according to the compensation intermediate value and the corresponding compensation value corresponding to the second display brightness level and the third display brightness level closest to the first display brightness level in the correspondence table.

[0108] Specifically, if the first gray scale compensation value s1 and the second gray scale compensation value s2 corresponding to the intermediate compensation value a and the first gray scale compensation value s11 and the second gray scale compensation value s22 corresponding to the intermediate compensation value b under the first display brightness level are stored in the correspondence table, if the current display picture includes the first gray scale and the second gray scale, and the intermediate compensation value corresponding to the current display picture is c, then the compensation value of the pixel group displaying the first gray scale in the current display picture before display can be obtained by interpolating s1 and s11 according to a, b, and c, and the compensation value of the pixel group displaying the second gray scale in the current display picture before display can be obtained by interpolating s2 and s22 according to a, b, and c. If the current display picture includes the third gray scale and the fourth gray scale, and the intermediate compensation value corresponding to the current display picture is d, then the compensation value s111 of the pixel group displaying the first gray scale when the intermediate compensation value is d can be obtained by interpolating s1 and s11 according to a, b, and d, the compensation value s222 of the pixel group displaying the second gray scale when the intermediate compensation value is d can be obtained by interpolating s2 and s22 according to a, b, and d, and the compensation values of the pixel group displaying the third gray scale and the pixel group displaying the fourth gray scale in the current display picture can be obtained by interpolating s111 and s222.

[0109] If the compensation intermediate value and the corresponding compensation value corresponding to the second display brightness level q2 and the third display brightness level q3 closest to the first display brightness level q1 are included in the correspondence table, then the compensation value corresponding to the compensation intermediate value of the current display picture is determined by interpolation according to the compensation intermediate value of the current display picture and the compensation intermediate values of the second display brightness level q2 and the third display brightness level q3, and the compensation values of the pixel groups are determined according to the compensation value corresponding to the compensation intermediate value of the current display picture.

[0110] On the basis of the above embodiment, the compensation value of each pixel group is optimized according to the compensation intermediate value in this embodiment: the parallel resistance of the plurality of pixel groups under the current picture is determined according to the total current; the parallel voltage across the pixel group is determined according to the parallel resistance and the first resistance; wherein the first resistance is the resistance between the first end of the plurality of pixel groups and the first power voltage input end; the compensation value of the i-th pixel group is determined according to the parallel voltage and the i-th voltage; wherein the plurality of pixel groups include at least one first pixel group, at least one second pixel group, at least one (n-1)-th pixel group, and at least one n-th pixel group; wherein n is a positive integer greater than or equal to 2, the first pixel group displays the first gray scale, the second pixel group displays the second gray scale, the (n-1)-th pixel group displays the (n-1)-th gray scale, and the n-th pixel group displays the n-th gray scale in the current display picture; i takes 1, 2, …, n-1 and n in turn, and the i-th voltage is the voltage across the pixel group when the plurality of pixel groups display the i-th gray scale. Figure 5 is a flowchart of another compensation method of a display panel provided by an embodiment of the present application. Optionally, reference can be made to Figure 5 , the compensation method of the display panel includes:

[0111] S110, determining a compensation intermediate value of the pixel group under the current display picture; wherein the compensation intermediate value includes the total current of the plurality of pixel groups or the parallel resistance of the plurality of pixel groups.

[0112] S121, determining the parallel resistance of the plurality of pixel groups under the current picture according to the total current.

[0113] S122, determining the parallel voltage across the pixel group according to the parallel resistance and the first resistance; wherein the first resistance is the resistance between the first end of the plurality of pixel groups and the first power voltage input end.

[0114] Reference can be made to Figure 2 , the first resistance is R0 in Figure 2 , the first resistance R0 is a constant value, and the first resistance can be obtained in advance by other means. Specifically, the first resistance R0 and the parallel resistance Rx are connected in series,

[0115] (ELVDD-ELVSS)*Rx / (Rx+R0) is the parallel voltage across the pixel group.

[0116] S123, determining a compensation value of the i-th pixel group according to the parallel voltage and the i-th voltage; wherein the plurality of pixel groups comprises at least one first pixel group, at least one second pixel group, at least one (n-1)-th pixel group, and at least one n-th pixel group; wherein n is a positive integer greater than or equal to 2, the first pixel group displays a first gray scale, the second pixel group displays a second gray scale, the (n-1)-th pixel group displays an (n-1)-th gray scale, and the n-th pixel group displays an n-th gray scale in the current display picture; i is sequentially 1, 2, …, n-1, and n; and the i-th voltage is a voltage across the pixel group when the plurality of pixel groups display the i-th gray scale.

[0117] Specifically, the i-th voltage is a voltage across the pixel group when the plurality of pixel groups display the i-th gray scale, for example, the i-th gray scale is 255 gray scale, and the i-th voltage is a voltage across the pixel group when the plurality of pixel groups display 255 gray scale. A plurality of voltages across the pixel group when the plurality of pixel groups display a first preset gray scale, or a plurality of voltages across the pixel group when the plurality of pixel groups display a second preset gray scale, and a plurality of voltages across the pixel group when the plurality of pixel groups display a plurality of gray scales can be determined in advance, and the plurality of voltages are stored in the display panel. The display panel can determine the i-th voltage by interpolation according to the plurality of voltages.

[0118] The display luminance of the pixel group Lum ∝ Volde 2 ∝ (Real ELVDD_U-VDS) 2 ∝ Real ELVDD_U 2 wherein Real ELVDD_U is the parallel voltage. Since the luminance of the pixel group is positively correlated with the square of the voltage across the pixel group, the luminance change rate of the i-th pixel group relative to the plurality of pixel groups displaying the i-th gray scale when the display panel displays the current display picture can be determined according to the square of the parallel voltage and the square of the i-th voltage, so that the i-th pixel group is compensated, the display luminance of the i-th pixel group when the display panel displays the current picture is close to or consistent with the pixel luminance when the plurality of pixel groups display the i-th gray scale, and the luminance of the same gray scale of the same sub-pixel is different when the display panel displays different pictures, which affects the picture display quality.

[0119] Optionally, the compensation value of the i-th pixel group is determined according to the parallel voltage and the i-th voltage, comprising:

[0120] determining a pixel luminance change rate of the i-th pixel group according to the parallel voltage and the i-th voltage; wherein the pixel luminance change rate of the i-th pixel group is a ratio of a current luminance of the i-th pixel group to an i-th luminance; the current luminance is a display luminance of the i-th pixel group when the display panel displays the current display picture; and the i-th luminance is a luminance of the i-th pixel group when the plurality of pixel groups display the i-th gray scale.

[0121] determining the compensation value of the i-th pixel group according to the pixel luminance change rate.

[0122] Optionally, the pixel luminance change rate of the i-th pixel group RealELVDD_U is a parallel voltage, and Real ELVDD_Ui is the i-th voltage.

[0123] Specifically, according to the brightness change rate of the i-th pixel group, the brightness compensation amount can be determined to determine the gray scale compensation amount or the driving voltage compensation amount, or the compensation gain coefficient.

[0124] Optionally, each pixel group includes at least three sub-pixels of different light emitting colors; after the compensation value of each pixel group is determined according to the compensation intermediate value, the method further includes:

[0125] The compensation value of each sub-pixel in the pixel group is determined according to the compensation value of the pixel group.

[0126] Specifically, when all the sub-pixels in the display panel are connected to the same first power voltage input end and the same second power voltage input end, the sub-pixels can be grouped, and each pixel group can include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, for example. The multiple pixel groups in the above embodiment are all the pixel groups in the display panel. First, the compensation value of the pixel group is determined, and then the compensation value of each sub-pixel in the same pixel group is determined according to the white balance requirement or the brightness ratio of red, green, and blue. In this way, on the one hand, the compensation difficulty is reduced, and on the other hand, the brightness of each pixel group when displaying the same gray scale in different pictures is ensured to be similar or consistent, thereby improving the picture display quality.

[0127] In addition, in order to avoid the mutual influence of the loads between sub-pixels of different colors, the embodiment further provides a new type of display panel, Figure 6 is an equivalent diagram of a display panel provided by the embodiment of the present application, for reference Figure 6 The display panel includes at least three sub-pixels of different light emitting colors, each pixel group includes one sub-pixel, the first end of a plurality of pixel groups including sub-pixels of the same light emitting color is connected to the same first power voltage input end, the second end of the plurality of pixel groups including sub-pixels of the same light emitting color is connected to the same second power voltage input end, and the first power voltage input end and the second power voltage input end connected by the sub-pixels of different light emitting colors are different.

[0128] Correspondingly, the compensation method includes determining the compensation intermediate value of the pixel group under the current display picture, including:

[0129] According to the current display picture, the compensation intermediate value of a plurality of pixel groups each including a sub-pixel of the same light emitting color is determined.

[0130] According to the compensation intermediate value, the compensation value of each pixel group is determined, including:

[0131] The compensation values of the sub-pixels of the same light-emitting color are determined according to the compensation intermediate values of the pixel groups containing the sub-pixels of the same light-emitting color.

[0132] Specifically, all the sub-pixels of the same light-emitting color in the display panel can be connected to the same first power voltage input end and the same second power voltage input end according to requirements. Alternatively, the display panel can be divided into at least two sub-regions, and the sub-pixels of the same light-emitting color in each sub-region are connected to the same first power voltage input end and the same second power voltage input end. In this case, the pixel groups in the above embodiments are all the sub-pixels of the same light-emitting color in the same sub-region. When compensation is performed, the compensation intermediate values of the pixel groups containing the sub-pixels of the same light-emitting color in the sub-region can be determined according to the current picture, and then the compensation values of the sub-pixels of the light-emitting color are determined according to the compensation intermediate values. The sub-pixels of different colors are connected to different first power voltage input ends and different second power voltage input ends, and the change of the display gray scale of the sub-pixels of one color does not affect the voltages across the sub-pixels of other colors, thereby avoiding the mutual influence of the sub-pixels of different colors, improving the picture display quality of the display panel, and reducing the difficulty of compensation.

[0133] Alternatively, all the sub-pixels of the same light-emitting color in the display panel are connected to the same first power voltage input end and the same second power voltage input end, and the sub-pixels of different light-emitting colors are connected to different first power voltage input ends and different second power voltage input ends.

[0134] Specifically, referring to Figure 6 , all the red sub-pixels R are connected to the same first power voltage input end ELVDD1 and the same second power voltage input end ELVSS1, all the green sub-pixels G are connected to the same first power voltage input end ELVDD2 and the same second power voltage input end ELVSS2, and all the blue sub-pixels B are connected to the same first power voltage input end ELVDD3 and the same second power voltage input end ELVSS3. The sub-pixels of different colors are connected to different first power voltage input ends and different second power voltage input ends, and the change of the display gray scale of the sub-pixels of one color does not affect the voltages across the sub-pixels of other colors, thereby avoiding the mutual influence of the sub-pixels of different colors, improving the picture display quality of the display panel, and reducing the difficulty of compensation.

[0135] Further, in the process of determining the compensation value of the pixel group, the total current or parallel resistance of all red sub-pixels is determined according to the display gray scale of the red sub-pixels in the current display picture, and the compensation value of each red sub-pixel is determined according to the total current or parallel resistance of the red sub-pixels. The total current or parallel resistance of all green sub-pixels is determined according to the display gray scale of the green sub-pixels in the current display picture, and the compensation value of each green sub-pixel is determined according to the total current or parallel resistance of the green sub-pixels. The total current or parallel resistance of all blue sub-pixels is determined according to the display gray scale of the blue sub-pixels in the current display picture, and the compensation value of each blue sub-pixel is determined according to the total current or parallel resistance of the blue sub-pixels.

[0136] It should be noted that the corresponding relationship table can include at least three sub-tables, and the at least three sub-tables correspond to the sub-pixels of at least three different light-emitting colors one by one. Each sub-table includes the compensation intermediate value and the compensation value corresponding to the sub-pixels of the corresponding light-emitting color.

[0137] Optionally, the compensation intermediate value of the pixel group under the current display picture is determined, including:

[0138] determining an ith total output current output by all ith pixel groups, and determining the total current of the plurality of pixel groups according to the first total output current, the second total output current, the (n-1)th total output current, and the nth total output current; wherein the plurality of pixel groups include at least one first pixel group, at least one second pixel group, at least one (n-1)th pixel group, and at least one nth pixel group; wherein n is a positive integer greater than or equal to 2, the first pixel group displays a first gray scale, the second pixel group displays a second gray scale, the (n-1)th pixel group displays an (n-1)th gray scale, and the nth pixel group displays an nth gray scale in the current display picture; i is 1, 2, …, n-1, and n in turn, and the ith voltage is a voltage across the pixel group when the plurality of pixel groups display an ith gray scale;

[0139] determining a parallel resistance of the plurality of pixel groups under the current picture according to the total current.

[0140] wherein the ith total output current is a sum of the output currents of all ith pixel groups in the plurality of pixel groups. Optionally, the ith total output current output by all ith pixel groups is determined, and the total current of the plurality of pixel groups is determined according to the first total output current, the second total output current, the (n-1)th total output current, and the nth total output current, including:

[0141] the output current of each pixel group is determined according to the following formula:

[0142] pixel_unit_Ii=K*pixel_unit_I*(Grayi / Gray255) Gamma *ratioi; wherein,

[0143] Grayi is the i-th gray scale, pixel_unit_Ii is the i-th total output current of all the i-th pixel groups, ratioi is the proportion of all the i-th pixel groups in the plurality of pixel groups, pixel_unit_I is the total output current when the plurality of pixel groups display 255 gray scale, K is a coefficient, and Gamma is a gamma value.

[0144] The first total output current, the second total output current, the (n-1)-th total output current, and the n-th total output current are added to obtain the total current of the plurality of pixel groups.

[0145] Specifically, since the brightness of the pixel group is positively correlated with the current of the pixel group, it can be obtained from the relationship between the gray scale and the brightness that pixel_unit_L = pixel_unit_L255 * (Grayi / Gray255). Gamma pixel_unit_Ii ∝ pixel_unit_I * (Gray64 / Gray255). Gamma Thus, the total current of the pixel group displaying the i-th gray scale pixel_unit_Ii = K * pixel_unit_I * (Grayi / Gray255) Gamma *ratioi. The coefficient K can be determined according to the actual situation of the sub-pixel, and an example can be determined according to calibration. The specific size of K is not specifically limited in the present embodiment. The present embodiment establishes the relationship between different gray scales and the current of 255 gray scales, and the current of the pixel group can be quickly calculated according to the gray scale, so as to obtain the total current and improve the compensation speed.

[0146] Optionally, determining the current parallel resistance of the plurality of pixel groups under the current picture according to the total current comprises:

[0147] The current parallel resistance is determined according to the following formula:

[0148] Rx = (Real ELVDD_U1) / (pixel_unit_I); wherein Rx is the current parallel resistance, Real ELVDD_U1 is the voltage across the pixel group when the plurality of pixel groups display the same preset gray scale, and pixel_unit_I is the total current.

[0149] The preset gray scale can be any gray scale, for example, the preset gray scale can be 255 gray scale, Real ELVDD_U1 can be calculated in advance, and Real ELVDD_U1 is stored in the display panel. For reference Figure 2Since R0 is smaller than the parallel resistance Rx of the pixel group, when the display gray scale of the pixel group changes, the voltage change between the pixel group is small, so the voltage between the pixel group at any preset gray scale can be calculated, and the approximate value of the parallel resistance is obtained according to the voltage and the total current, and the approximate value is determined as the parallel resistance. The parallel resistance is calculated by the voltage between the pixel group and the total current when the plurality of pixel groups display the same preset gray scale in the embodiment, which simplifies the calculation process and improves the compensation speed.

[0150] Figure 7 is a flowchart of another compensation method of a display panel provided by an embodiment of the application, referring to Figure 7 , the compensation method of the display panel comprises:

[0151] S101, determining a first compensation intermediate value and a first compensation value of the pixel group when the display panel displays a first preset picture at a first preset display brightness level.

[0152] S102, determining a second compensation intermediate value and a second compensation value of the pixel group when the display panel displays a second preset picture at the first preset display brightness level. Among the first preset picture and the second preset picture, the gray scale displayed by at least part of the pixel group is different, and the second preset picture is different from the first preset picture.

[0153] S103, determining a third compensation intermediate value and a third compensation value of the pixel group when the display panel displays a third preset picture at a second preset display brightness level.

[0154] S104, determining a fourth compensation intermediate value and a fourth compensation value of the pixel group when the display panel displays a fourth preset picture at the second preset display brightness level; among the third preset picture and the fourth preset picture, the gray scale displayed by at least part of the pixel group is different, and the third preset picture is different from the fourth preset picture.

[0155] S105, determining the corresponding relationship between the compensation intermediate value and the compensation value according to the first compensation intermediate value, the first compensation value, the second compensation intermediate value, the second compensation value, the third compensation intermediate value, the third compensation value, the fourth compensation intermediate value and the fourth compensation value, and storing the corresponding relationship into the display panel.

[0156] S110, determining the compensation intermediate value of the pixel group under the current display picture; wherein the compensation intermediate value comprises the total current of the plurality of pixel groups or the parallel resistance of the plurality of pixel groups.

[0157] S124, determining the compensation value of each pixel group according to the compensation intermediate value and the corresponding relationship between the compensation intermediate value and the compensation value stored in advance.

[0158] Specifically, the first preset display brightness level can be any display brightness level. When the pixel group comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, the first preset picture, the second preset picture, the third preset picture and the fourth preset picture can be white pictures. When the pixel group comprises one sub-pixel, the first preset picture, the second preset picture, the third preset picture and the fourth preset picture can all be white pictures, or all be monochrome pictures of the same color. For example, when the pixel group comprises a red sub-pixel, the first preset picture, the second preset picture, the third preset picture and the fourth preset picture are all red pictures.

[0159] When the pixel group comprises one sub-pixel, the correspondence between the compensation intermediate value and the compensation value of the red sub-pixel can be determined according to the first compensation intermediate value, the first compensation value, the second compensation intermediate value, the second compensation value, the third compensation intermediate value, the third compensation value, the fourth compensation intermediate value and the fourth compensation value of the red sub-pixel. The correspondence between the compensation intermediate value and the compensation value of the green sub-pixel can be determined according to the first compensation intermediate value, the first compensation value, the second compensation intermediate value, the second compensation value, the third compensation intermediate value, the third compensation value, the fourth compensation intermediate value and the fourth compensation value of the green sub-pixel. The correspondence between the compensation intermediate value and the compensation value of the blue sub-pixel can be determined according to the first compensation intermediate value, the first compensation value, the second compensation intermediate value, the second compensation value, the third compensation intermediate value, the third compensation value, the fourth compensation intermediate value and the fourth compensation value of the blue sub-pixel.

[0160] Optionally, determining the first compensation intermediate value and the first compensation value of the pixel group when the display panel displays the first preset picture at the first preset display brightness level (S124) comprises:

[0161] S1, determining a first resistance between the first end of the plurality of pixel groups and the first power voltage input end, and a jth parallel resistance of the plurality of pixel groups when the plurality of pixel groups display a jth gray scale; wherein j is a positive integer, and j takes 1, 2, …, m-1 and m in turn, m is a positive integer greater than or equal to 2, m is the number of different gray scales in the first preset display picture, and a jth pixel group in the display panel displays a jth gray scale.

[0162] S2, determining a jth voltage between the two ends of the pixel group when the plurality of pixel groups display the jth gray scale according to the first resistance and the jth parallel resistance.

[0163] S3, determining a jth output current output by all jth pixel groups when the display panel displays the first preset picture at the first preset display brightness level, and determining a first total current of the plurality of pixel groups according to the first output current, a second output current, …, an (m-1)th output current and an mth output current.

[0164] S4, determining a preset parallel resistance of the plurality of pixel groups at the first preset picture according to the first total current.

[0165] S5, determining a preset parallel voltage across the plurality of pixel groups according to the preset parallel resistance and the first resistance.

[0166] S6, determining a first compensation value of the jth pixel group according to the preset parallel voltage and a jth voltage. The jth voltage is a voltage across the plurality of pixel groups when the plurality of pixel groups display a jth gray scale.

[0167] Specifically, the jth output current is a total output current of all the jth pixel groups connected to the same first power voltage input terminal and the same second power voltage input terminal. It is referred to Figure 6 Different color sub-pixels are connected to different first power voltage input terminals and second power voltage input terminals, and the first preset picture is a red picture including two gray scales. The process of determining the first compensation value of the red sub-pixel is taken as an example for illustration:

[0168] 1. All red sub-pixels display 255 gray scale (on pixel ratio 100% 255), the first resistance corresponding to the red sub-pixel R is R01, and the parallel resistance of each red sub-pixel is R11.

[0169] The total current flowing through all red sub-pixels is pixel_unit_I11, and the current of a single sub-pixel is controlled by the data voltage.

[0170] ΔV = ELVDD - ELVSS, then:

[0171] The voltage across the red sub-pixel

[0172] The red sub-pixel brightness pixel_unit_L11 ∝ pixel_unit_I11;

[0173] The parallel electric group of each red sub-pixel

[0174] 2. Taking the red sub-pixel as an example, all red sub-pixels display 64 gray scale (on pixel ratio 100% 64), the first resistance corresponding to the red sub-pixel R is R01, and the parallel electric group of each red sub-pixel is R12.

[0175] The voltage across the red sub-pixel

[0176] The red sub-pixel brightness pixel_unit_L22 ∝ pixel_unit_I22;

[0177] From the gray scale brightness relationship:

[0178] pixel_unit_L2 = pixel_unit_L11 * (Gray64 / Gray255) Gamma ;

[0179] Then the current of red sub-pixel:

[0180] pixel_unit_I22 ∝ pixel_unit_I11 * (Gray64 / Gray255) Gamma ;

[0181] Wherein, ratio2 is the proportion of red sub-pixels displaying 64 gray scale to all the red sub-pixels.

[0182] 3. The red sub-pixel displays the first preset picture, part of the red sub-pixels in the first preset picture displays 64 gray scale, part of the red sub-pixels displays 255 gray scale, and the proportion sum of the sub-pixels displaying 64 gray scale and the sub-pixels displaying 255 gray scale is 1.

[0183] The total current of the red sub-pixel displaying 255 gray scale:

[0184] pixel_unit_I11' = pixel_unit_I11 * ratio1, wherein, ratio1 is the proportion of the red sub-pixels displaying 255 gray scale to all the red sub-pixels.

[0185] The total current of all the red sub-pixels displaying 64 gray scale: pixel_unit_I22' =

[0186] pixel_unit_I22 * ratio1 = K * pixel_unit_I1 * (Gray64 / Gray255) Gamma * ratio2;

[0187] The total current of the red sub-pixel: pixel_unit_I33 = pixel_unit_I11' + pixel_unit_I22';

[0188] Parallel resistance of all the red sub-pixels (The voltage change between the red sub-pixels is small, Real ELVDD_U11 can be directly used to calculate pixel_Rx, the current pixel_I33 changes and pixel_Rx is inversely proportional).

[0189] The actual red sub-pixel changes pixel_Rx due to the current change, which causes the voltage change between the red sub-pixels;

[0190]

[0191] Then, the compensation value of the red sub-pixel displaying 64 gray scales is determined according to the parallel voltage Real ELVDD_U33 and the voltage Real ELVDD_U211 when all the red sub-pixels display 64 gray scales, and the compensation value of the red sub-pixel displaying 255 gray scales is determined according to the parallel voltage Real ELVDD_U33 and the voltage Real ELVDD_U22 when all the red sub-pixels display 255 gray scales.

[0192] The above embodiment only exemplarily shows the case that part of the red sub-pixels display 64 gray scales and part of the red sub-pixels display 255 gray scales, and is not a limitation to the present application. When the first preset display screen includes multiple gray scales, the total current of the pixel group displaying each gray scale can also be determined according to the above method, then the total current and the parallel resistance of the pixel groups connected to the same first power voltage input terminal and the same second power voltage input terminal are determined, so as to determine the parallel voltage, and the first compensation value is determined according to the parallel voltage and the jth voltage.

[0193] Optionally, the first compensation value of the jth pixel group according to the preset parallel voltage and the jth voltage includes:

[0194] determining the pixel luminance change rate of the jth pixel group according to the preset parallel voltage and the jth voltage; wherein the pixel luminance change rate of the jth pixel group is the ratio of the current luminance of the jth pixel group to the jth luminance; the current luminance is the display luminance of the jth pixel group when the display panel displays the first preset display screen; and the jth luminance is the luminance of the jth pixel group when the multiple pixel groups display the jth gray scale.

[0195] determining the first compensation value of the jth pixel group according to the pixel luminance change rate.

[0196] Optionally, the pixel luminance change rate of the jth pixel group is

[0197] RealELVDD_U2 is the preset parallel voltage, and RealELVDD_U j is the jth voltage.

[0198] Specifically, R01, R11 and R12 can be determined in advance according to calibration or the like. For example, the luminance of the red sub-pixel in the first preset picture can be measured in advance, and the luminance variation rate of the sub-pixel displaying 64 gray scales and the luminance variation rate of the sub-pixel displaying 255 gray scales can be determined according to the luminance of the red sub-pixel and the luminance of the red sub-pixel displaying 64 gray scales and the luminance of the red sub-pixel displaying 255 gray scales. The display luminance of the red sub-pixel in a red picture containing 64 gray scales and 255 gray scales can be measured again, and the luminance variation rate of the sub-pixel displaying 64 gray scales and the luminance variation rate of the sub-pixel displaying 255 gray scales in the red picture can be determined. R01, R11 and R12 can be calculated according to the luminance variation rates obtained above and the relationship formula of the luminance variation rate and R01, R11 and R12.

[0199] Optionally, the method further comprises:

[0200] The jth voltage is determined according to the following formula:

[0201] wherein Real ELVDD_Uj is the jth voltage, R0 is the first resistance, Rj is the jth parallel resistance, ΔV is the difference between the first power supply voltage and the second power supply voltage, the first power supply voltage is the voltage input by the first power supply voltage input end, and the second power supply voltage is the voltage input by the second power supply voltage input end.

[0202] The preset parallel voltage between the two ends of the current pixel group is determined according to the preset parallel resistance and the first resistance, comprising:

[0203] wherein Rx1 is the preset parallel resistance.

[0204] The embodiment of the present application further provides a compensation device of a display panel, the display panel comprising a plurality of pixel groups, each of the pixel groups comprising at least one sub-pixel, the first end of the plurality of pixel groups being electrically connected with a first power supply voltage input end, and the second end of the plurality of pixel groups being electrically connected with a second power supply voltage input end.

[0205] Figure 8 is a schematic diagram of a compensation device of a display panel provided by the embodiment of the present application, referring to Figure 8 , the compensation device of the display panel comprising:

[0206] The compensation intermediate value determination module 210 is configured to determine the compensation intermediate value of the pixel group under the current display picture, wherein the compensation intermediate value comprises the total current of the plurality of pixel groups or the parallel resistance of the plurality of pixel groups.

[0207] The compensation value determination module 220 is configured to determine the compensation value of each pixel group according to the compensation intermediate value.

[0208] The embodiment of the present application further provides a display device, Figure 9 is a schematic diagram of a display device provided by the embodiment of the present application, referring to Figure 9 The display device 100 comprises a display panel 200 and the compensation device 300 of the display panel according to any embodiment of the present application. The display device 100 can be a mobile phone, a tablet computer or other electronic equipment.

[0209] It should be understood that the steps can be reordered, added or deleted using the various forms of flow shown above. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0210] The specific embodiments described above do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A compensation method of a display panel, characterized by, The display panel comprises a plurality of pixel groups, each of the pixel groups comprises at least one sub-pixel, a first end of the plurality of pixel groups is electrically connected to a first power voltage input end, and a second end of the plurality of pixel groups is electrically connected to a second power voltage input end. The compensation method of the display panel comprises: determining a compensation intermediate value of the pixel groups in a current display picture, wherein the compensation intermediate value comprises a total current of the plurality of pixel groups or a parallel resistance of the plurality of pixel groups; determining a compensation value of each pixel group according to the compensation intermediate value; determining a compensation value of each pixel group according to the compensation intermediate value, comprising: determining a compensation value of each pixel group according to the compensation intermediate value and a pre-stored corresponding relationship between the compensation intermediate value and the compensation value; determining a compensation value of each pixel group according to the compensation intermediate value and a pre-stored corresponding relationship between the compensation intermediate value and the compensation value, comprising: determining the compensation value of each pixel group by an interpolation algorithm according to the compensation intermediate value and a pre-stored corresponding relationship table, wherein the corresponding relationship table is a corresponding relationship table between the compensation intermediate value and the compensation value; the corresponding relationship table comprises compensation intermediate values and compensation values corresponding to at least two different display brightness levels, and the same display brightness level comprises at least two different compensation intermediate values and compensation values corresponding to the at least two different compensation intermediate values; determining a compensation value of each pixel group according to the compensation intermediate value and a pre-stored corresponding relationship table by an interpolation algorithm, comprising: if the corresponding relationship table comprises a first display brightness level corresponding to the current display picture and does not comprise the compensation intermediate value corresponding to the current display picture, determining the compensation value of each pixel group in the current display picture by interpolation according to two compensation intermediate values and corresponding compensation values closest to the compensation intermediate value under the first display brightness level in the corresponding relationship table; if the corresponding relationship table does not comprise the first display brightness level corresponding to the current display picture, determining the compensation value of each pixel group in the current display picture by interpolation according to compensation intermediate values and corresponding compensation values corresponding to a second display brightness level and a third display brightness level closest to the first display brightness level in the corresponding relationship table.

2. The method of claim 1, wherein, Another method for determining a compensation value of each pixel group according to the compensation intermediate value, comprising: determining a parallel resistance of the plurality of pixel groups in the current picture according to the total current; determining a parallel voltage across the pixel group according to the parallel resistance and a first resistance, wherein the first resistance is a resistance between the first end of the plurality of pixel groups and the first power voltage input end; and determining a compensation value of each pixel group according to the parallel voltage. determining a compensation value of the i-th pixel group according to the parallel voltage and the i-th voltage; wherein the pixel groups include at least one first pixel group, at least one second pixel group, at least one (n-1)-th pixel group, and at least one n-th pixel group; wherein n is a positive integer greater than or equal to 2, the first pixel group displays a first gray scale, the second pixel group displays a second gray scale, the (n-1)-th pixel group displays an (n-1)-th gray scale, and the n-th pixel group displays an n-th gray scale in the current display image; i is 1, 2, …, n-1, and n in turn, and the i-th voltage is a voltage across the pixel groups when the pixel groups display an i-th gray scale.

3. The method of claim 2, wherein, The method according to any one of claims 1-4, wherein the determining of the compensation value of the i-th pixel group according to the parallel voltage and the i-th voltage comprises: determining a pixel brightness change rate of the i-th pixel group according to the parallel voltage and the i-th voltage; wherein the pixel brightness change rate of the i-th pixel group is a ratio of a current brightness of the i-th pixel group to an i-th brightness; the current brightness is a display brightness of the i-th pixel group when the display panel displays the current display image; and the i-th brightness is a brightness of the i-th pixel group when the pixel groups display the i-th gray scale. The method according to any one of claims 1-4, wherein the determining of the compensation value of the i-th pixel group according to the pixel brightness change rate comprises:

4. The method of claim 3, wherein, A rate of change of luminance of pixels of the i-th pixel group Real ELVDD_U is a parallel voltage, and Real ELVDD_U i is the i-th voltage.

5. The method according to claim 1, wherein each of the pixel groups includes at least three sub-pixels of different light-emitting colors; after the determining of the compensation value of each of the pixel groups according to the compensation intermediate value, the method further comprises determining compensation values of the sub-pixels in each of the pixel groups according to the compensation value of the pixel group; or the display panel includes at least three sub-pixels of different light-emitting colors, and each of the pixel groups includes one sub-pixel; first ends of a plurality of pixel groups including sub-pixels of the same light-emitting color are connected to the same first power voltage input end, and second ends of the plurality of pixel groups including the sub-pixels of the same light-emitting color are connected to the same second power voltage input end; first power voltage input ends and second power voltage input ends connected to pixel groups including sub-pixels of different light-emitting colors are different; and the determining of the compensation intermediate value of the pixel groups under the current display image comprises: determining compensation intermediate values of a plurality of pixel groups including sub-pixels of the same light-emitting color according to the current display image; the determining of the compensation value of each of the pixel groups according to the compensation intermediate value comprises: determining compensation values of the sub-pixels of the same light-emitting color according to the compensation intermediate values of the plurality of pixel groups including the sub-pixels of the same light-emitting color. All sub-pixels of the same light-emitting color in the display panel are connected to the same first power voltage input end, and all sub-pixels of the same light-emitting color are connected to the same second power voltage input end; and first power voltage input ends and second power voltage input ends connected to sub-pixels of different light-emitting colors are different.

6. The method of claim 5, wherein, The determining of the compensation intermediate value of the pixel groups under the current display image comprises:

7. The method of claim 2, wherein, ​ determining an i-th total output current output by all i-th pixel groups, and determining a total current of the plurality of pixel groups according to the first total output current, the second total output current, the (n-1)-th total output current, and the n-th total output current; wherein the plurality of pixel groups comprise at least one first pixel group, at least one second pixel group, at least one (n-1)-th pixel group, and at least one n-th pixel group; wherein n is a positive integer greater than or equal to 2, the first pixel group displays a first gray scale, the second pixel group displays a second gray scale, the (n-1)-th pixel group displays an (n-1)-th gray scale, and the n-th pixel group displays an n-th gray scale in the current display picture; i is 1, 2, …, n-1, and n in turn, and the i-th voltage is a voltage across the pixel groups when the plurality of pixel groups display an i-th gray scale; determining a parallel resistance of the plurality of pixel groups in the current picture according to the total current.

8. The method of claim 7, wherein, The method for determining the i-th total output current output by all i-th pixel groups, and determining a total current of the plurality of pixel groups according to the first total output current, the second total output current, the (n-1)-th total output current, and the n-th total output current, comprises: determining the i-th total output current of all i-th pixel groups according to the following formula: pixel_unit_Ii = K * pixel_unit_I * (Grayi / Gray255) Gamma *ratioi; wherein, Grayi is an i-th gray scale, pixel_unit_Ii is an i-th total output current of all i-th pixel groups, ratioi is a proportion of all i-th pixel groups in the plurality of pixel groups, pixel_unit_I is a total output current when the plurality of pixel groups display a 255 gray scale, K is a coefficient, and Gamma is a gamma value; adding the first total output current, the second total output current, the (n-1)-th total output current, and the n-th total output current to obtain the total current of the plurality of pixel groups.

9. The method of claim 7, wherein, The method for determining a parallel resistance of the plurality of pixel groups in the current picture according to the total current comprises: determining the parallel resistance according to the following formula: Rx=(Real ELVDD_U1) / (pixel_unit_I); wherein Rx is the parallel resistance, Real ELVDD_U1 is a voltage across the pixel groups when the plurality of pixel groups display a same preset gray scale, and pixel_unit_I is the total current.

10. The method of claim 1, wherein, Before determining the compensation intermediate value of the pixel groups in the current display picture, the method further comprises: determining a first compensation intermediate value and a first compensation value of the pixel groups when a display panel displays a first preset picture at a first preset display brightness level; determining a second compensation intermediate value and a second compensation value of the pixel groups when the display panel displays a second preset picture at the first preset display brightness level; wherein gray scales displayed by at least some pixel groups in the first preset picture and the second preset picture are different, and the second preset picture is different from the first preset picture; determining a third compensation intermediate value and a third compensation value of the pixel groups when the display panel displays a third preset picture at a second preset display brightness level; determine a fourth compensation intermediate value and a fourth compensation value of the pixel group when the display panel displays a fourth preset picture at the second preset display brightness level; wherein the third preset picture and the fourth preset picture are different, and at least part of the pixel groups in the third preset picture and the fourth preset picture display different gray scales; determine a corresponding relationship between the compensation intermediate value and the compensation value according to the first compensation intermediate value, the first compensation value, the second compensation intermediate value, the second compensation value, the third compensation intermediate value, the third compensation value, the fourth compensation intermediate value and the fourth compensation value, and store the corresponding relationship into the display panel.

11. The method of claim 10, wherein, determine a first compensation intermediate value and a first compensation value of the pixel group when the display panel displays a first preset picture at a first preset display brightness level, including: determine a first resistance between the first end of the plurality of pixel groups and the first power voltage input end, and a jth parallel resistance of the plurality of pixel groups when the plurality of pixel groups display a jth gray scale; wherein j is a positive integer, j is sequentially taken as 1, 2, …, m-1 and m, m is a positive integer greater than or equal to 2, m is the number of different gray scales in the first preset display picture, and a jth pixel group in the display panel displays a jth gray scale; determine a jth voltage between the two ends of the plurality of pixel groups when the plurality of pixel groups display a jth gray scale according to the first resistance and the jth parallel resistance; determine a jth output current output by all the jth pixel groups when the display panel displays the first preset picture at the first preset display brightness level, and determine a first total current of the plurality of pixel groups according to the first output current, a second output current, …, an (m-1)th output current and an mth output current; determine a preset parallel resistance of the plurality of pixel groups at the first preset picture according to the first total current; determine a preset parallel voltage between the two ends of the plurality of pixel groups according to the preset parallel resistance and the first resistance; determine a first compensation value of the jth pixel group according to the preset parallel voltage and the jth voltage; wherein the jth voltage is a voltage between the two ends of the plurality of pixel groups when the plurality of pixel groups display a jth gray scale.

12. The method of claim 11, wherein, determine a first compensation value of the jth pixel group according to the preset parallel voltage and the jth voltage, including: determine a pixel brightness change rate of the jth pixel group according to the preset parallel voltage and the jth voltage; wherein the pixel brightness change rate of the jth pixel group is a ratio of a current brightness of the jth pixel group to a jth brightness; the current brightness is a display brightness of the jth pixel group when the display panel displays the first preset display picture; and the jth brightness is a brightness of the jth pixel group when the plurality of pixel groups display a jth gray scale; determine a first compensation value of the jth pixel group according to the pixel brightness change rate.

13. The method of claim 12, wherein, Pixel luminance change rate of the jth pixel group Real ELVDD_U2 is a preset parallel voltage, and RealELVDD_Uj is the jth voltage.

14. The method of claim 11, wherein, Further comprising: determine the jth voltage according to the following formula: Real ELVDD_Uj = (R0 + Rj) * (V1 - V2) / (R0 + Rj + 1) wherein Real ELVDD_Uj is the jth voltage, R0 is the first resistance, Rj is the jth parallel resistance, ΔV is the difference between the first power voltage and the second power voltage, the first power voltage is the voltage input by the first power voltage input terminal, and the second power voltage is the voltage input by the second power voltage input terminal; determine a preset parallel voltage between the two ends of the plurality of pixel groups according to the preset parallel resistance and the first resistance, including: wherein Rx1is a preset parallel resistance.

15. A compensation device of a display panel, characterized by, the display panel includes a plurality of pixel groups, each of the pixel groups includes at least one sub-pixel, a first end of the plurality of pixel groups is electrically connected with a first power voltage input end, and a second end of the plurality of pixel groups is electrically connected with a second power voltage input end; the compensation device of the display panel includes: The compensation intermediate value determination module is configured to determine a compensation intermediate value of the pixel group in the current display picture; wherein the compensation intermediate value comprises a total current of the pixel groups or a parallel resistance of the pixel groups; The compensation value determination module is configured to determine a compensation value of each pixel group according to the compensation intermediate value; The compensation value determination module is configured to determine a compensation value of each pixel group according to the compensation intermediate value, comprising: The compensation value determination module is configured to determine a compensation value of each pixel group according to the compensation intermediate value and a pre-stored corresponding relationship between the compensation intermediate value and the compensation value; The compensation value determination module is configured to determine a compensation value of each pixel group according to the compensation intermediate value and a pre-stored corresponding relationship between the compensation intermediate value and the compensation value, comprising: The compensation value determination module is configured to determine the compensation value of each pixel group according to the compensation intermediate value and the pre-stored corresponding relationship table by an interpolation algorithm; wherein the corresponding relationship table is a corresponding relationship table between the compensation intermediate value and the compensation value; The corresponding relationship table comprises compensation intermediate values and compensation values corresponding to at least two different display brightness levels, and the same display brightness level comprises at least two different compensation intermediate values and compensation values corresponding to the at least two different compensation intermediate values; The compensation value determination module is configured to determine the compensation value of each pixel group according to the compensation intermediate value and the pre-stored corresponding relationship table by an interpolation algorithm, comprising: If the corresponding relationship table comprises a first display brightness level corresponding to the current display picture and does not comprise the compensation intermediate value corresponding to the current display picture, the compensation value of each pixel group in the current display picture is determined by interpolation according to two compensation intermediate values and corresponding compensation values closest to the compensation intermediate value under the first display brightness level in the corresponding relationship table; If the corresponding relationship table does not comprise the first display brightness level corresponding to the current display picture, the compensation value of each pixel group in the current display picture is determined by interpolation according to compensation intermediate values and corresponding compensation values corresponding to a second display brightness level and a third display brightness level closest to the first display brightness level in the corresponding relationship table.

16. A display device comprising: A compensation device comprising the display panel of claim 15.

Images