Brightness compensation method and brightness compensation device for display panel

Abstract

The present invention discloses a method and device for compensating brightness of a display panel. The method includes obtaining the luminance of each light-emitting device in the display panel at at least two preset grayscales; determining the target brightness of the light-emitting device at different preset grayscales based on the luminance of each light-emitting device; and compensating the luminance of the display panel based on the target brightness at different preset grayscales. In an embodiment of the present invention, the target brightness at different preset grayscales is obtained based on the luminance of each light-emitting device at the at least two preset grayscales, and the luminance of each light-emitting device at the current grayscale is adjusted to the target brightness corresponding to the current grayscale, thereby improving the uniformity of the display panel.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of display, and more particularly to a brightness compensation method and a brightness compensation device for a display panel. Background Art

[0002] With the rapid development of electronic devices, users have increasingly higher requirements for the screen display of electronic devices, making the screen display of electronic devices receive more and more attention from the industry.

[0003] Display panels for electronic devices, especially Micro-LED (micro-light-emitting diode) displays, are rapidly gaining popularity due to their high contrast and long lifecycle. However, before they can be fully mass-produced, many issues remain to be addressed, including mura (uneven brightness). Summary of the Invention

[0004] The present invention provides a brightness compensation method and a brightness compensation device for a display panel, so as to improve the Mura phenomenon of the display panel, increase the uniformity of the luminous brightness of the entire display panel, and improve the display effect of the display panel.

[0005] In a first aspect, an embodiment of the present invention provides a brightness compensation method for a display panel, comprising:

[0006] Obtaining the luminance of each light-emitting device in the display panel under at least two preset grayscales;

[0007] determining the target brightness of the light-emitting device at different preset grayscales according to the light-emitting brightness of each light-emitting device;

[0008] The light emitting brightness of the display panel is compensated according to the target brightness under different preset grayscales.

[0009] Optionally, determining the target brightness of the light-emitting device at different preset grayscales according to the light-emitting brightness of each light-emitting device includes:

[0010] Calculating an average brightness value at a preset grayscale according to the light emitting brightness of each of the light emitting devices at the preset grayscale, and using the average brightness value at the preset grayscale as the target brightness at the preset grayscale;

[0011] The brightness average value at another preset grayscale is calculated according to the luminance of each light-emitting device at another preset grayscale, and is used as the target brightness at another preset grayscale, until the target brightness at at least two preset grayscales is determined.

[0012] Optionally, compensating the luminance of the display panel according to the target luminance at different preset grayscales includes:

[0013] Compensating the light emitting brightness of each of the light emitting devices according to a target brightness at the preset grayscale;

[0014] The light emitting brightness of the display panel at all gray levels is compensated according to the target brightness at at least two preset gray levels.

[0015] Optionally, compensating the light emitting brightness of each of the light emitting devices according to a target brightness at a preset grayscale includes:

[0016] The light emitting brightness of each of the light emitting devices at the preset gray scale is adjusted to a target brightness at the preset gray scale.

[0017] Optionally, the relationship between the luminous brightness of the preset grayscale and the target brightness corresponding to the preset grayscale is:

[0018] Y1=A1X1+B1, where Y1 is the target brightness of the preset grayscale, X1 is the luminous brightness corresponding to the preset grayscale, and A1 and B1 are first compensation coefficients.

[0019] Optionally, compensating the luminance of all grayscales of the display panel according to the target brightness at at least two preset grayscales includes:

[0020] Obtaining target brightness at all grayscales according to the target brightness at at least two preset grayscales;

[0021] The light emitting brightness of the display panel at all gray levels is compensated according to the target brightness at all gray levels.

[0022] Optionally, acquiring the target brightness at all grayscales according to the target brightness at at least two preset grayscales includes:

[0023] The target brightness at all grayscales is fitted according to the target brightness at at least two preset grayscales.

[0024] Optionally, when there are two preset grayscales, the relationship between the target brightness of any grayscale and the corresponding grayscale is: Y2=A2X2+B2, where Y2 is the target brightness of any grayscale, X2 is the corresponding grayscale, and A2 and B2 are second compensation coefficients;

[0025] When there are three preset grayscales, the relationship between the target brightness of any grayscale and the corresponding grayscale is: Y3=A3X3 2 +B3X3+C3, where Y3 is the target brightness of any grayscale, X3 is the corresponding grayscale, and A3, B3, and C3 are the second compensation coefficients.

[0026] In a second aspect, an embodiment of the present invention further provides a brightness compensation device for a display panel, the brightness compensation device comprising:

[0027] A luminous brightness acquisition module, used to acquire the luminous brightness of each light-emitting device in the display panel under at least two preset grayscales;

[0028] a target brightness determination module, configured to determine the target brightness of the light emitting device at different preset grayscales according to the light emitting brightness of each light emitting device;

[0029] The compensation module is used to compensate the luminous brightness of the display panel according to the target brightness under different preset grayscales.

[0030] Optionally, the target brightness determination module includes:

[0031] an average value obtaining unit, configured to calculate an average value of brightness at a preset grayscale according to the luminance of each of the light-emitting devices at the preset grayscale, and use the average value as the target brightness at the preset grayscale;

[0032] The average value acquisition unit is further configured to calculate the brightness average value at another preset grayscale based on the luminous brightness of each light-emitting device at another preset grayscale, and use the average value as the target brightness at another preset grayscale until the target brightness at at least two preset grayscales are determined.

[0033] Embodiments of the present invention provide a brightness compensation method and apparatus for a display panel. The brightness compensation method includes: obtaining the luminance of each light-emitting device in the display panel at at least two preset grayscales; determining the target brightness of the light-emitting device at different preset grayscales based on the luminance of each light-emitting device; and compensating the luminance of the display panel based on the target brightness at different preset grayscales. Embodiments of the present invention obtain the target brightness at different preset grayscales based on the luminance of each light-emitting device at at least two preset grayscales, and adjust the luminance of each light-emitting device at the current grayscale to the target brightness corresponding to the current grayscale. This not only improves the uniformity of luminance within a display area, but also improves the uniformity of luminance between different areas, thereby improving the uniformity of luminance across the entire display panel, alleviating mura on the display panel, and enhancing the display quality of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a flow chart of a brightness compensation method for a display panel provided by an embodiment of the present invention;

[0035] Figure 2 is a flow chart of another method for brightness compensation of a display panel provided by an embodiment of the present invention;

[0036] Figure 3 is a flow chart of another method for brightness compensation of a display panel provided by an embodiment of the present invention;

[0037] Figure 4 is a flow chart of another method for brightness compensation of a display panel provided by an embodiment of the present invention;

[0038] Figure 5 It is a structural schematic diagram of a brightness compensation device for a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0040] As described in the background technology, display panels, especially Micro-LED display panels, have the problem of uneven display when displaying. The inventors have found that the reasons for the above problems are the poor individuality of LED small chips, differences in bonding between LEDs and backplanes, batch transfer differences, backplane pixel circuit differences and aging differences. The above factors cause the display panel to have uneven brightness, thereby reducing the display effect of the display panel.

[0041] Based on the above reasons, an embodiment of the present invention provides a brightness compensation method for a display panel. Figure 1 This is a flow chart of a brightness compensation method for a display panel provided in an embodiment of the present invention. This embodiment is applicable to situations where brightness compensation of a display panel is required. The method can be performed by a brightness compensation device and specifically includes the following steps:

[0042] S01: Obtaining the light emitting brightness of each light emitting device in the display panel under at least two preset grayscales.

[0043] Specifically, the preset grayscale is a pre-set display grayscale. The number of preset grayscales is greater than or equal to two. Exemplarily, the number of preset grayscales can be two. Optionally, one of the preset grayscales can be the maximum displayed grayscale. When the display grayscale of the display panel is 0-255, grayscale 255 is the maximum displayed grayscale. At the maximum grayscale, the light-emitting device has the highest brightness, making it easier to obtain the brightness value of the light-emitting device and reducing errors in the obtained brightness value.

[0044] The display panel includes a plurality of pixel structures, each of which may include at least one sub-pixel structure, and each sub-pixel structure corresponds to a light-emitting device. The light-emitting devices in the display panel may include multiple types, for example, red light-emitting devices, blue light-emitting devices, and green light-emitting devices, thereby realizing the display of multiple colors. For example, when the display panel is a Micro-LED display panel, when preparing the Micro-LED display panel, the substrate on which the LEDs are formed is different from the substrate on which the driving circuit is formed. Therefore, after the LEDs are prepared, a transfer device is required to transfer the numerous LEDs to the substrate on which the driving circuit is formed. However, the number of transfer stations in the transfer device that can be used to transfer the LEDs is limited. Therefore, each transfer can only transfer a certain number of LEDs. Multiple transfer operations are required to transfer all the LEDs to the substrate on which the driving circuit is formed. Different batches of transfer operations may cause differences between the LEDs transferred this time and the LEDs transferred in different batches. This batch transfer difference is manifested as a brightness difference between fixed areas, that is, the Micro-LED display panel will have brightness differences between different areas due to the difference in each transfer.

[0045] The luminance of each light-emitting device in the display panel at a preset grayscale refers to the brightness of the light-emitting device when it is illuminated at the preset grayscale. In the driver chip of the display panel, there is a one-to-one correspondence between grayscale and luminance, and a one-to-one correspondence between luminance and data voltage. The luminance of a light-emitting device in the display panel at a preset grayscale refers to the luminance of the light-emitting device when the data voltage corresponding to the preset grayscale is supplied to the light-emitting device in the display panel.

[0046] When obtaining the luminous brightness at different preset grayscales, you can first set the current display grayscale of the display panel to a preset grayscale, obtain the luminous brightness of each light-emitting device at a preset grayscale, obtain the brightness of each light-emitting device at the current grayscale, and then light up the display panel at another preset grayscale to obtain the luminous brightness of each light-emitting device at another preset grayscale, and so on, until the luminous brightness of the light-emitting devices at all preset grayscales is obtained.

[0047] In this embodiment, the luminous brightness of the light-emitting device can be acquired through optical equipment, such as a charge-coupled device camera.

[0048] S02: determining the target brightness of each light-emitting device at different preset grayscales according to the light-emitting brightness of each light-emitting device.

[0049] Specifically, in this embodiment, when determining the target brightness based on the luminous brightness at a grayscale, a mapping relationship exists between the luminous brightness and the target brightness. Based on the mapping relationship, the target brightness can be determined from the luminous brightness. Exemplarily, the mapping relationship between the target brightness and the luminous brightness can be such that the target brightness is the average value of the luminous brightness. It should be noted that this is merely an example, and in other embodiments, the luminous brightness and the target brightness can also have other mapping relationships, which are not specifically limited in this embodiment.

[0050] It is worth noting that one preset grayscale corresponds to one target brightness. When there are two preset grayscales in this embodiment, two target brightnesses can be obtained, and so on.

[0051] S03: Compensating the luminous brightness of the display panel according to target brightness under different preset grayscales.

[0052] Specifically, at a preset grayscale, the luminance of the light-emitting device is adjusted to the target brightness corresponding to this grayscale, and at another preset grayscale, the luminance of the light-emitting device is adjusted to the target brightness corresponding to this other preset grayscale, thereby improving the uniformity of the luminance within the same display area, and at the same time improving the uniformity of the luminance between different areas, improving the unevenness of the luminance between different areas caused by batch transfer differences, and thus improving the uniformity of the luminance of the entire display panel, improving the Mura phenomenon of the display panel, and improving the display effect of the display panel.

[0053] This embodiment provides a brightness compensation method for a display panel. The method includes: obtaining the luminance of each light-emitting device in the display panel at at least two preset grayscales; determining the target brightness of the light-emitting device at different preset grayscales based on the luminance; and compensating the luminance of the display panel based on the target brightness at different preset grayscales. This embodiment obtains the target brightness at different preset grayscales based on the luminance of each light-emitting device at the at least two preset grayscales, and adjusts the luminance of each light-emitting device at the current grayscale to the target brightness corresponding to the current grayscale. This method not only improves the uniformity of the luminance of the light-emitting devices within a certain display area, but also improves the uniformity of the luminance between different areas, thereby improving the uniformity of the luminance of the entire display panel, reducing the mura phenomenon of the display panel, and improving the display quality of the display panel.

[0054] Figure 2 A flowchart of another method for compensating brightness of a display panel provided by an embodiment of the present invention is provided. Figure 2 Optionally, the brightness compensation method includes:

[0055] S10: Obtaining the light emitting brightness of each light emitting device in the display panel under at least two preset grayscales.

[0056] Specifically, the implementation of step S10 may refer to step S01 of the above embodiment.

[0057] S21: calculating an average brightness value at a preset grayscale according to the light emitting brightness of each light emitting device at a preset grayscale, and using the average brightness value as a target brightness at the preset grayscale.

[0058] Specifically, the display grayscale of the display panel is set to the first preset grayscale, the display panel is lit at the first preset grayscale, the luminous brightness of each light-emitting device at this time is obtained, the average brightness is calculated based on the luminous brightness of each light-emitting device, and this average value is used as the target brightness corresponding to the first preset grayscale.

[0059] S22: calculating an average brightness value at another preset grayscale according to the light emitting brightness of each light emitting device at another preset grayscale, and using the average brightness value as the target brightness at another preset grayscale, until at least two target brightness values at the preset grayscales are determined.

[0060] Specifically, after obtaining the target brightness corresponding to the first preset grayscale, the display panel is illuminated at a second preset grayscale, the luminance of each light-emitting device at the second grayscale is obtained, an average luminance is calculated based on the luminance of each light-emitting device, and this average luminance is used as the target brightness corresponding to the second preset grayscale. If there are multiple preset grayscales, step S22 is repeated to continue setting the display grayscale of the display panel to another preset grayscale, and the luminance of each light-emitting device at the other preset grayscale is obtained. The average luminance is calculated based on the luminance of each light-emitting device, and the target brightness corresponding to another preset grayscale is determined, until the target brightness of all preset grayscales is determined.

[0061] S30: Compensating the luminous brightness of the display panel according to target brightness under different preset grayscales.

[0062] Specifically, the implementation of step S30 may refer to step S03 of the above embodiment.

[0063] Figure 3 A flowchart of another method for compensating brightness of a display panel provided by an embodiment of the present invention is provided. Figure 3 Optionally, the brightness compensation method of the display panel includes:

[0064] S100: Obtaining the light emitting brightness of each light emitting device in the display panel under at least two preset grayscales.

[0065] Specifically, the implementation of step S100 may refer to step S01 of the above embodiment.

[0066] S210: Calculating an average brightness value at a preset grayscale according to the light emitting brightness of each light emitting device at a preset grayscale, and using the average brightness value as a target brightness at the preset grayscale.

[0067] Specifically, the implementation of step S210 may refer to step S21 of the above embodiment.

[0068] S220: Calculating an average brightness value at another preset grayscale according to the light emitting brightness of each light emitting device at another preset grayscale, and using the average brightness value as the target brightness at another preset grayscale, until at least two target brightness values at the preset grayscales are determined.

[0069] Specifically, the implementation of step S220 may refer to step S22 of the above embodiment.

[0070] S310: Compensating the light emitting brightness of each light emitting device according to a target brightness at a preset grayscale.

[0071] Optionally, the light emitting brightness of each light emitting device at a preset gray scale is adjusted to a target brightness at the preset gray scale.

[0072] When adjusting the brightness of each light-emitting device to a target brightness at a preset grayscale, the brightness of each light-emitting device can be adjusted by adjusting the data voltage of each light-emitting device, thereby ensuring that the brightness of each light-emitting device is adjusted to the target brightness. By adjusting the brightness of each light-emitting device to the target brightness at a preset grayscale, the brightness of each light-emitting device is compensated for, improving the uneven display brightness of the display panel caused by individual differences in light-emitting devices and differences in the bonding between the light-emitting devices and the backplane, and ensuring the uniformity of the display panel.

[0073] Optionally, the relationship between the luminous brightness of the preset grayscale and the target brightness corresponding to the preset grayscale is:

[0074] Y1=A1X1+B1, where Y1 is the target brightness of the preset grayscale, X1 is the luminous brightness corresponding to the preset grayscale, and A1 and B1 are first compensation coefficients.

[0075] Exemplarily, a preset grayscale can be grayscale 255. The display panel is illuminated at grayscale 255, the luminance of each light-emitting device is obtained, and the average luminance of all light-emitting devices is calculated, and this average is used as the target brightness at grayscale 255. Exemplarily, the target brightness is 120. At grayscale 255, the luminance of the first light-emitting device is 118. In this case, the relationship is Y1=X1+2. The luminance of the second light-emitting device is 119. In this case, the relationship is Y1=X1+1. That is, the relationship between the luminance and the target brightness is: Y1=X1+B1. When there are M light-emitting devices (M is the number of light-emitting devices), M B1 parameters can be obtained and used as the first compensation coefficient. It is worth noting that the first compensation coefficient is a set of coefficients.

[0076] Alternatively, when the target brightness is 120 at a grayscale of 255, the brightness of the first light-emitting device is 118, then the relationship is Y1=1.017X1, and the brightness of the second light-emitting device is 119, then the relationship is Y1=1.008X1, that is, the relationship between the brightness and the target brightness is: Y1=A1X1. When there are M light-emitting devices, M A1 parameters can be obtained and used as the first compensation coefficient.

[0077] The obtained first compensation coefficient A or B is stored in a storage module. Optionally, the storage module is a register, which is used to perform brightness compensation on each light-emitting device according to the stored first compensation coefficient when the display panel is subsequently displayed, thereby achieving brightness compensation for a single light-emitting device, solving the problem of uneven brightness caused by differences in the light-emitting devices themselves and differences in bonding between the light-emitting devices and the backplane, and ensuring the uniformity of display brightness when the display panel is displayed.

[0078] S320: Compensating the light emitting brightness of the display panel at all gray levels according to target brightness at at least two preset gray levels.

[0079] Based on the target brightness at at least two preset grayscales, the target brightness at all grayscales is obtained. Then, at each grayscale, the brightness of each light-emitting device is adjusted to the target brightness corresponding to that grayscale, performing brightness compensation at all grayscales. Compensating for brightness at all grayscales not only improves the uniformity of luminance within a display area, but also improves the uniformity of luminance between different areas. This improves the uniformity of luminance across the entire display panel, mitigates mura, and enhances the display quality of the display panel.

[0080] Figure 4 A flowchart of another method for compensating brightness of a display panel provided by an embodiment of the present invention is provided. Figure 4 Optionally, the brightness compensation method of the display panel includes:

[0081] S101: Obtaining the light emitting brightness of each light emitting device in a display panel under at least two preset grayscales.

[0082] Specifically, the implementation of step S101 may refer to step S01 of the above embodiment.

[0083] S211: Calculating an average brightness value at a preset grayscale according to the light emitting brightness of each light emitting device at a preset grayscale, and using the average brightness value as a target brightness at the preset grayscale.

[0084] Specifically, the implementation of step S211 may refer to step S21 of the above embodiment.

[0085] S221: Calculating an average brightness value at another preset grayscale according to the light emitting brightness of each light emitting device at another preset grayscale, and using the average brightness value as the target brightness at another preset grayscale, until at least two target brightness values at the preset grayscales are determined.

[0086] Specifically, the implementation of step S221 may refer to step S22 of the above embodiment.

[0087] S311: Compensating the light emitting brightness of each light emitting device according to a target brightness at a preset grayscale.

[0088] Specifically, the implementation of step S311 may refer to step S310 of the above embodiment.

[0089] S321: Obtain target brightness at all grayscales according to target brightness at at least two preset grayscales.

[0090] Optionally, the target brightness at all grayscales is fitted according to the target brightness at at least two preset grayscales.

[0091] Optionally, when there are two preset grayscales, the relationship between the target brightness of any grayscale and the corresponding grayscale is: Y2=A2X2+B2, where Y2 is the target brightness of any grayscale, X2 is the corresponding grayscale, and A2 and B2 are second compensation coefficients.

[0092] For example, when the number of preset grayscales is two, the grayscale value of the first preset grayscale is G1, and the target brightness calculated under the first preset grayscale is L1; the grayscale value of the second preset grayscale is G2, and the target brightness calculated under the second preset grayscale is L2. Then, based on the two groups of data points (G1, L1) and (G2, L2), a relationship Y2=A2X2+B2 representing the relationship between grayscale and target brightness can be fitted. According to the fitted relationship, the target brightness corresponding to each grayscale can be obtained.

[0093] Optionally, when there are three preset grayscales, the relationship between the target brightness of any grayscale and the corresponding grayscale is: Y3=A3X3 2 +B3X3+C3, where Y3 is the target brightness of any grayscale, X is the corresponding grayscale, and A3, B3, and C3 are the second compensation coefficients.

[0094] For example, when the number of preset grayscales is three, the grayscale value of the first preset grayscale is G1, the target brightness calculated at the first preset grayscale is L1, the grayscale value of the second preset grayscale is G2, the target brightness calculated at the second preset grayscale is L2, the grayscale value of the third preset grayscale is G3, and the target brightness calculated at the third preset grayscale is L3. Then, according to the three groups of data points (G1, L1), (G2, L2) and (G3, L3), the relationship between grayscale and target brightness can be fitted as Y3=A3X3 2 +B3X3+C3, according to the fitted relationship, the target brightness corresponding to each grayscale can be obtained.

[0095] This embodiment only schematically illustrates the form of the relationship between the grayscale and the target brightness when the number of preset grayscales is two or three. In other embodiments, when the number of preset grayscales is four, the fitted relationship is Y4=A4X4 3 +B4X4 2 +C4X4+D4, when the number of preset gray levels is N, the fitted relationship is Y N =A N X N-1 +B N X N N-2 +C N X N N-3 +…D N X N +E N ; Among them, A4, B4, C4, D4 are the second compensation coefficients, or A N 、B N 、C N 、D N 、E N is the second compensation coefficient.

[0096] S322: Compensating the light emitting brightness of all gray levels of the display panel according to the target brightness of all gray levels.

[0097] After obtaining the target brightness at each grayscale, at each grayscale, a compensation coefficient for each light-emitting device can be obtained based on the luminance of each light-emitting device and the target brightness corresponding to this grayscale, thereby obtaining a set of compensation coefficients. These compensation coefficients can be transmitted to the compensation module for storage, so that when the display panel subsequently displays an image, brightness compensation is performed based on these compensation coefficients. This can not only improve the uniformity of the luminance of the light-emitting devices in a certain display area, but also improve the uniformity of the luminance between different areas, thereby improving the uniformity of the luminance of the entire display panel, improving the Mura phenomenon of the display panel, and improving the display effect of the display panel.

[0098] An embodiment of the present invention further provides a brightness compensation device for a display panel. Figure 5 A schematic diagram of a brightness compensation device for a display panel according to an embodiment of the present invention is provided. Figure 5 Optionally, the brightness compensation device of the display panel includes:

[0099] The luminous brightness acquisition module 100 is used to acquire the luminous brightness of each light-emitting device in the display panel under at least two preset grayscales.

[0100] The target brightness determination module 200 is configured to determine the target brightness of each light emitting device at different preset grayscales according to the light emitting brightness of each light emitting device.

[0101] The compensation module 300 is used to compensate the luminance of the display panel according to target luminances under different preset grayscales.

[0102] The target brightness determination module of this embodiment obtains target brightness at different preset grayscales based on the luminance of each light-emitting device at at least two preset grayscales. The compensation module adjusts the luminance of each light-emitting device at the current grayscale to the target brightness corresponding to the current grayscale. This can not only improve the uniformity of the luminance of the light-emitting devices within a certain display area, but also improve the uniformity of the luminance between different areas, thereby improving the uniformity of the luminance of the entire display panel, improving the mura phenomenon of the display panel, and improving the display effect of the display panel.

[0103] Optionally, the target brightness determination module includes:

[0104] an average value obtaining unit, configured to calculate an average value of brightness at a preset grayscale according to the luminance of each light-emitting device at a preset grayscale, and use the average value as the target brightness at the preset grayscale;

[0105] The average value acquisition unit is further configured to calculate the brightness average value at another preset grayscale according to the luminous brightness of each light-emitting device at another preset grayscale, and use the brightness average value as the target brightness at another preset grayscale, until the target brightness at at least two preset grayscales are determined.

[0106] Optionally, the compensation module includes:

[0107] The first sub-compensation unit is configured to compensate the luminance of each light emitting device according to a target luminance at a preset grayscale.

[0108] Specifically, the first sub-compensation unit is used to adjust the light emitting brightness of each light emitting device at a preset gray scale to a target brightness at the preset gray scale.

[0109] Optionally, the relationship between the luminous brightness of the preset grayscale and the target brightness corresponding to the preset grayscale is:

[0110] Y1=A1X1+B1, where Y1 is the target brightness of the preset grayscale, X1 is the luminous brightness corresponding to the preset grayscale, and A1 and B1 are first compensation coefficients.

[0111] The second sub-compensation unit is configured to compensate for the luminous brightness of all grayscales of the display panel according to target brightness under at least two preset grayscales.

[0112] Optionally, the second sub-compensation unit includes:

[0113] The fitting unit is configured to obtain target brightness at all grayscales according to target brightness at at least two preset grayscales.

[0114] Specifically, the fitting unit may be configured to fit the target brightness at all grayscales according to the target brightness at at least two preset grayscales.

[0115] Optionally, when there are two preset grayscales, the relationship between the target brightness of any grayscale and the corresponding grayscale is: Y2=A2X2+B2, where Y2 is the target brightness of any grayscale, X2 is the corresponding grayscale, and A2 and B2 are second compensation coefficients.

[0116] Optionally, when there are three preset grayscales, the relationship between the target brightness of any grayscale and the corresponding grayscale is: Y3=A3X3 2 +B3X3+C3, where Y3 is the target brightness of any grayscale, X3 is the corresponding grayscale, and A3, B3, and C3 are the second compensation coefficients.

[0117] The brightness compensation unit is used to compensate the luminous brightness of all gray levels of the display panel according to the target brightness under all gray levels.

[0118] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A brightness compensation method for a display panel, characterized in that: include: Obtaining the luminance of each light-emitting device in the display panel under at least two preset grayscales; determining the target brightness of the light-emitting device at different preset grayscales according to the light-emitting brightness of each light-emitting device; Compensating the luminous brightness of the display panel according to target brightness under different preset grayscales; The compensating the luminance of the display panel according to the target luminance at different preset grayscales includes: Compensating the light emitting brightness of each of the light emitting devices according to a target brightness at the preset grayscale; Compensating the luminous brightness of all grayscales of the display panel according to the target brightness under at least two preset grayscales; The compensating the luminous brightness of all grayscales of the display panel according to the target brightness under at least two preset grayscales includes: Obtaining target brightness at all grayscales according to the target brightness at at least two preset grayscales; Compensating the luminous brightness of all gray levels of the display panel according to the target brightness at all gray levels; After obtaining the target brightness at each grayscale, at each grayscale, the compensation coefficient of each light-emitting device can be obtained according to the luminous brightness of each light-emitting device and the target brightness corresponding to this grayscale, and then a set of compensation coefficients can be obtained. This compensation coefficient can be transmitted to the compensation module for storage.

2. The brightness compensation method of a display panel according to claim 1, wherein: The step of determining the target brightness of the light emitting device at different preset grayscales according to the light emitting brightness of each light emitting device includes: Calculating an average brightness value at a preset grayscale according to the light emitting brightness of each of the light emitting devices at the preset grayscale, and using the average brightness value at the preset grayscale as the target brightness at the preset grayscale; The brightness average value at another preset grayscale is calculated according to the luminance of each light-emitting device at another preset grayscale, and is used as the target brightness at another preset grayscale, until the target brightness at at least two preset grayscales is determined.

3. The brightness compensation method of a display panel according to claim 1, wherein: The compensating the luminance of each light emitting device according to the target luminance at the preset grayscale includes: The light emitting brightness of each of the light emitting devices at the preset gray scale is adjusted to a target brightness at the preset gray scale.

4. The brightness compensation method of a display panel according to claim 3, wherein: The relationship between the luminous brightness of the preset grayscale and the target brightness corresponding to the preset grayscale is: Y1=A1X1+B1, where Y1 is the target brightness of the preset grayscale, X1 is the luminous brightness corresponding to the preset grayscale, and A1 and B1 are first compensation coefficients.

5. The brightness compensation method of a display panel according to claim 1, wherein: The acquiring target brightness at all grayscales according to the target brightness at at least two preset grayscales includes: The target brightness at all grayscales is fitted according to the target brightness at at least two preset grayscales.

6. The brightness compensation method of a display panel according to claim 5, wherein: When there are two preset grayscales, the relationship between the target brightness of any grayscale and the corresponding grayscale is: Y2=A2X2+B2, where Y2 is the target brightness of any grayscale, X2 is the corresponding grayscale, and A2 and B2 are the second compensation coefficients; When there are three preset grayscales, the relationship between the target brightness of any grayscale and the corresponding grayscale is: Y3=A3X3 2 +B3X3+C3, where Y3 is the target brightness of any grayscale, X3 is the corresponding grayscale, and A3, B3, and C3 are the second compensation coefficients.

7. A brightness compensation device for a display panel, characterized in that: include: A luminous brightness acquisition module, configured to acquire the luminous brightness of each light-emitting device in the display panel under at least two preset grayscales; a target brightness determination module, configured to determine the target brightness of the light emitting device at different preset grayscales according to the light emitting brightness of each light emitting device; a compensation module, configured to compensate the luminance of the display panel according to target luminances at different preset grayscales; The compensation module includes: A first sub-compensation unit, configured to compensate the light emitting brightness of each light emitting device according to a target brightness at a preset grayscale; a second sub-compensation unit, configured to compensate for the luminance of all grayscales of the display panel according to target brightness under at least two preset grayscales; The second sub-compensation unit includes: A fitting unit, configured to obtain target brightness at all grayscales based on target brightness at at least two preset grayscales; a brightness compensation unit, configured to compensate the luminous brightness of all grayscales of the display panel according to the target brightness at all grayscales; After obtaining the target brightness at each grayscale, at each grayscale, the compensation coefficient of each light-emitting device can be obtained according to the luminous brightness of each light-emitting device and the target brightness corresponding to this grayscale, and then a set of compensation coefficients can be obtained. This compensation coefficient can be transmitted to the compensation module for storage.

8. The brightness compensation device for a display panel according to claim 7, wherein: The target brightness determination module includes: an average value obtaining unit, configured to calculate an average value of brightness at a preset grayscale according to the luminance of each of the light-emitting devices at the preset grayscale, and use the average value as the target brightness at the preset grayscale; The average value acquisition unit is further configured to calculate the brightness average value at another preset grayscale based on the luminous brightness of each light-emitting device at another preset grayscale, and use the average value as the target brightness at another preset grayscale until the target brightness at at least two preset grayscales are determined.

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