CN113948041A

CN113948041A - Brightness compensation method and device of display panel and electronic equipment

Info

Publication number: CN113948041A
Application number: CN202111194703.9A
Authority: CN
Inventors: 程益明
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd
Current assignee: Kunshan Govisionox Optoelectronics Co Ltd
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2022-01-18
Anticipated expiration: 2041-10-13
Also published as: CN113948041B

Abstract

The embodiment of the application provides a brightness compensation method and device of a display panel and electronic equipment, wherein the display panel comprises a display area and a non-display area, the display area comprises at least one display sub-area, and the method comprises the following steps: after the display sub-region performs brightness compensation based on the first gamma curve, if the brightness values of the plurality of gray scales of the display sub-region in the first gray scale range are greater than a preset brightness threshold, the following steps are performed: acquiring a plurality of first binding points in a first gray scale range; determining register values corresponding to the plurality of first binding points respectively based on a second gamma curve, wherein the gamma value of the second gamma curve is smaller than that of the first gamma curve; and performing brightness compensation on the display subarea according to the register value and a predetermined compensation coefficient. The display panel and the display method can improve the overcompensation problem of the display sub-region in the first gray scale range, and reduce or even eliminate the Mura phenomenon of the display panel in the first gray scale range.

Description

Brightness compensation method and device of display panel and electronic equipment

Technical Field

The present application relates to the field of display technologies, and in particular, to a method and an apparatus for compensating brightness of a display panel, and an electronic device.

Background

The organic light emitting diode OLED display panel has the characteristics of fast response, higher contrast, wide viewing angle, wide color gamut, no backlight source and the like, so the organic light emitting diode OLED display panel is more and more widely applied to electronic equipment such as smart phones and the like.

In the production process of the OLED display panel, due to the reasons of materials, processes and the like, the phenomenon of uneven picture display brightness of partial products, namely Mura, can occur. In order to compensate for the Mura phenomenon caused by the defects in the process, the brightness of the target display area in the display panel can be corrected by a brightness compensation method (such as external optical DeMura compensation), so as to eliminate the Mura phenomenon.

The inventor of the present application finds that after performing brightness compensation on a target display area in an OLED display panel by using a current brightness compensation method, a Mura phenomenon of the OLED display panel is aggravated at a high gray scale.

Disclosure of Invention

The embodiment of the application provides a brightness compensation method and device of a display panel and electronic equipment, which can solve the problem that the Mura phenomenon of an OLED display panel is aggravated in high gray scale in the prior art.

In a first aspect, an embodiment of the present application provides a brightness compensation method for a display panel, where the display panel includes a display area, and the display area includes at least one display sub-area, and the method includes: after the brightness compensation is performed on the display sub-region based on the first gamma curve, if the brightness values of the plurality of gray scales of the display sub-region in the first gray scale range are greater than a preset brightness threshold value, and the minimum gray scale value of the first gray scale range is greater than or equal to the preset gray scale threshold value, the following steps are performed: acquiring a plurality of first binding points in a first gray scale range; determining register values corresponding to the plurality of first binding points respectively based on a second gamma curve, wherein the gamma value of the second gamma curve is smaller than that of the first gamma curve; and performing brightness compensation on the display subarea according to the register value and a predetermined compensation coefficient.

In some embodiments, after acquiring the plurality of first bindings in the first gray scale range and before determining the register values corresponding to the respective plurality of first bindings based on the second gamma curve, the method may further include: acquiring a plurality of second binding points in the first gray scale range, wherein the difference value of the gray scale values between at least one group of adjacent binding points in the plurality of second binding points is larger than the difference value of the gray scale values between at least one group of adjacent binding points in the plurality of first binding points; determining register values corresponding to the plurality of first binding points based on the second gamma curve, specifically comprising: based on the second gamma curve, register values corresponding to the second binding points are determined.

Therefore, the gray scale values of the binding points in the first gray scale range are adjusted, so that the difference value of the gray scale values between at least one group of adjacent binding points is increased, the brightness compensation quantity of each gray scale in the first gray scale range can be reduced, and the brightness value of each gray scale in the first gray scale range after brightness compensation is further reduced, the problem of overcompensation of the display sub-region in the first gray scale range is further improved, and the Mura phenomenon of the display panel in the first gray scale range is weakened or even eliminated.

In some embodiments, before determining the register values corresponding to each of the plurality of first bindings based on the second gamma curve, the method may further include: acquiring a first brightness value of a display sub-region under a target gray scale; obtaining a first gamma value corresponding to the first brightness value according to the first brightness value and a predetermined first corresponding relationship, wherein the first corresponding relationship is a corresponding relationship between the first brightness value and the first gamma value; determining a target gamma value according to the gamma value of the first gamma curve and a first difference value, wherein the first difference value is the difference value between the first gamma value and the gamma value of the first gamma curve; and selecting a gamma curve of the target gamma value as a second gamma curve.

Therefore, the gamma curve with the corresponding gamma value can be selected as the second gamma curve according to the severity of the overcompensation, so that the selected second gamma curve is more in line with the actual situation, and the overcompensation problem of the display sub-region in the first gray scale range is improved to a greater extent.

In some embodiments, the expression of the first correspondence relationship includes:

wherein, the maximum gray scale and the brightness value corresponding to the maximum gray scale are known, and γ 1 represents the first gamma value.

In some embodiments, determining the target gamma value according to the gamma value of the first gamma curve and the first difference specifically includes: obtaining the product of the first difference value and a preset multiple; and obtaining a target gamma value according to the difference between the gamma value of the first gamma curve and the product.

Thus, the first difference is corrected by a preset multiple, so that a gamma value finally meeting the over-compensation severity can be obtained.

In some embodiments, any one of the first and second bindings is a third binding, and the compensation factor includes a second difference between a register value of each third binding before the brightness compensation based on the first gamma curve and a register value after the brightness compensation based on the first gamma curve; performing brightness compensation on the display sub-region according to the register value and a predetermined compensation coefficient, specifically comprising: obtaining a register value compensated by each third binding point according to the register value corresponding to each third binding point and a second difference value corresponding to each third binding point; and driving the sub-pixels of the corresponding color in the display sub-area to emit light according to the register value compensated by each third binding point.

In some embodiments, any one of the first and second bindings is a third binding, and the compensation factor includes a ratio between a register value of each third binding before the brightness compensation based on the first gamma curve and a register value after the brightness compensation based on the first gamma curve; performing brightness compensation on the display sub-region according to the register value and a predetermined compensation coefficient, specifically comprising: obtaining a register value compensated by each third binding point according to the register value corresponding to each third binding point and the ratio corresponding to each third binding point; and driving the sub-pixels of the corresponding color in the display sub-area to emit light according to the register value compensated by each third binding point.

In some embodiments, any one of the first binding and the second binding is a third binding, and the determining, based on the second gamma curve, the register value corresponding to each of the plurality of bindings specifically includes: for any ith third binding point of the plurality of third binding points, performing the steps of: determining a target brightness value of the ith third binding point according to the corresponding relation between the gray scale and the brightness value in the second gamma curve; acquiring an initial register value corresponding to the ith third binding point and a measurement brightness value corresponding to the ith third binding point in the initial register value; adjusting the initial register value to enable the difference value between the measurement brightness value corresponding to the adjusted initial register value and the target brightness value to be within a preset error range; and taking the adjusted initial register value as a register value corresponding to the ith third binding point, wherein i is a positive integer.

In some embodiments, each third binding compensated register value comprises a red subpixel compensated register value, a green subpixel compensated register value, and a blue subpixel compensated register value under each third binding; driving the sub-pixels of the corresponding color in the display sub-area to emit light according to the register value compensated by each third binding point, specifically comprising: driving the red sub-pixels in the display sub-area to emit light according to the register value compensated by the red sub-pixels; driving the green sub-pixels in the display sub-area to emit light according to the register value compensated by the green sub-pixels; and driving the blue sub-pixel in the display sub-area to emit light according to the register value compensated by the blue sub-pixel.

In a second aspect, an embodiment of the present application provides an apparatus for compensating brightness of a display panel, where the display panel includes a display area, and the display area includes at least one display sub-area, and the apparatus includes: the acquisition module is used for acquiring a plurality of first binding points in a first gray scale range under the condition that the brightness value of a plurality of gray scales of the display sub-region in the first gray scale range is greater than a preset brightness threshold value after the display sub-region performs brightness compensation based on the first gamma curve; the minimum gray scale value of the first gray scale range is greater than or equal to a preset gray scale threshold value; the first determining module is used for determining register values corresponding to the first bindings on the basis of a second gamma curve, wherein the gamma value of the second gamma curve is smaller than that of the first gamma curve; and the brightness compensation module is used for performing brightness compensation on the display sub-area according to the register value and a predetermined compensation coefficient.

In a third aspect, an embodiment of the present application provides an electronic device, where the electronic device includes: a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the brightness compensation method of the display panel as provided in any of the embodiments of the first aspect.

The brightness compensation method, the brightness compensation device and the electronic equipment of the display panel in the embodiment of the application have the advantages that the display panel comprises a display area and a non-display area, the display area comprises at least one display sub-area, and the method comprises the following steps: after the brightness compensation is performed on the display sub-region based on the first gamma curve, if the brightness values of the plurality of gray scales of the display sub-region in the first gray scale range are greater than a preset brightness threshold value, and the minimum gray scale value of the first gray scale range is greater than or equal to the preset gray scale threshold value, the following steps are performed: acquiring a plurality of first binding points in a first gray scale range; determining register values corresponding to the plurality of first binding points respectively based on a second gamma curve, wherein the gamma value of the second gamma curve is smaller than that of the first gamma curve; and performing brightness compensation on the display subarea according to the register value and a predetermined compensation coefficient. That is, for the display sub-region subjected to brightness compensation based on the first gamma curve, when the display sub-region is overcompensated in the first gray scale range, the embodiment of the present application readjusts the register value corresponding to each binding point in the first gray scale range based on the second gamma curve with a smaller gamma value, so as to reduce the brightness compensation amount of each gray scale in the first gray scale range, further reduce the brightness value of the display sub-region subjected to brightness compensation of each gray scale in the first gray scale range, improve the overcompensation problem of the display sub-region in the first gray scale range, and reduce or even eliminate the Mura phenomenon of the display panel in the first gray scale range.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a gamma curve corresponding to brightness values before and after brightness compensation of a target display region;

FIG. 2 is a schematic structural diagram of a display panel;

fig. 3 is a flowchart illustrating a luminance compensation method for a display panel according to an embodiment of the present disclosure;

fig. 4 is a flowchart illustrating a method for compensating brightness of a display panel according to another embodiment of the present disclosure;

fig. 5 is a flowchart illustrating a luminance compensation method for a display panel according to still another embodiment of the present disclosure;

fig. 6 is a flowchart illustrating a luminance compensation method for a display panel according to still another embodiment of the present disclosure;

fig. 7 is a flowchart illustrating a luminance compensation method for a display panel according to still another embodiment of the present disclosure;

fig. 8 is a flowchart illustrating a method for compensating brightness of a display panel according to yet another embodiment of the present disclosure;

FIG. 9 is a diagram schematically illustrating an effect after brightness compensation according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a luminance compensation apparatus of a display panel according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Before explaining the technical solutions provided by the embodiments of the present application, in order to facilitate understanding of the embodiments of the present application, the present application first specifically explains the problems existing in the prior art:

as mentioned above, during the production process of the display panel, due to the material and the process, the uneven brightness of the display screen may occur on some products, i.e. Mura. In order to compensate for the Mura phenomenon caused by the defects in the process, the brightness of the target display area in the display panel can be corrected by a brightness compensation method (such as external optical DeMura compensation), so as to eliminate the Mura phenomenon.

However, the inventors of the present application have found that after performing brightness compensation on a target display area in a display panel by using the current brightness compensation method, the target display area is overcompensated, and the overcompensation is most obvious especially at high gray levels. Overcompensation is understood to mean that the luminance value after luminance compensation exceeds the desired target luminance value. As shown in fig. 1, in the high gray level portion (e.g. 145 to 255 gray levels), the gamma value (curve 1) corresponding to the brightness value before the brightness compensation is maintained at about the target gamma value (e.g. gamma value 2.2), and the gamma value (curve 2) corresponding to the brightness value after the brightness compensation exceeds the target gamma value, i.e. the problem of over-compensation occurs.

Therefore, due to the over-compensation problem, the Mura phenomenon of the display panel after brightness compensation is not improved in the high gray scale, but is increased.

In view of the above research of the inventor, the embodiments of the present application provide a method and an apparatus for compensating brightness of a display panel, and an electronic device, which can reduce or even eliminate the Mura phenomenon of the display panel at high gray levels.

The technical idea of the embodiment of the application is as follows: for the display sub-region subjected to brightness compensation based on the first gamma curve, when the display sub-region is overcompensated in the first gray scale range, the register values corresponding to the binding points in the first gray scale range are readjusted based on the second gamma curve with a smaller gamma value, so that the brightness compensation amount of each gray scale in the first gray scale range is reduced, the brightness value of the display sub-region subjected to brightness compensation of each gray scale in the first gray scale range is further reduced, the overcompensation problem of the display sub-region in the first gray scale range is improved, and the Mura phenomenon of the display panel in the first gray scale range is weakened or even eliminated.

For ease of understanding, the implementation principle of the embodiment of the present application is described below with reference to the relationship between the gamma value and the brightness value.

The relational expression between the gamma value and the luminance value is as follows:

where γ represents a gamma value, the maximum gray level may include 255 gray levels.

As can be seen from the above expression (1), since the current gray scale is not greater than the maximum gray scale, when the current gray scale is smaller than the maximum gray scale, the ratio of the current gray scale to the maximum gray scale is smaller than 1, and therefore, when the gamma value γ decreases, the value on the left side of the equation increases, and further, the luminance value of the current gray scale on the right side of the equation increases, so that the luminance difference between the luminance value of the current gray scale and the luminance value of the maximum gray scale decreases. For example, taking the 240 gray level and the 255 gray level as an example, the luminance value of the 255 gray level is 500nit, when the gamma value is 2.2, the luminance value of the 240 gray level is 437.57nit, the luminance difference value between the 240 gray level and the 255 gray level is 62.43nit, the 62.43nit is divided into 15 gray levels between the 255 gray level and the 240 gray level, and each gray level is divided into 4.16 nit. Then, the luminance compensation is performed, for example, 4.16 × k is multiplied by the luminance compensation coefficient k, so that the luminance compensation amount is 4.16 × k. For example, when the gamma value is 2.0, the luminance value of the 240 gray level is 442.9nit, the luminance difference between the 240 gray level and the 255 gray level is 57.1nit, the 57.1nit is divided into 15 gray levels between the 255 gray level and the 240 gray level, and each gray level is divided into about 3.8 nit. Then, the luminance compensation is performed, and if the luminance compensation coefficient k is multiplied by 3.8, the luminance compensation amount is 3.8 × k. Obviously, 3.8 × k is less than 4.16 × k. Therefore, by reducing the gamma value gamma, the brightness compensation amount of each gray scale in the first gray scale range can be reduced, and the brightness value of the display sub-region after brightness compensation of each gray scale in the first gray scale range is further reduced, so that the problem of overcompensation of the display sub-region in the first gray scale range is solved.

The following describes a brightness compensation method for a display panel provided in an embodiment of the present application. As shown in fig. 2, the display panel 20 may include a display area AA including at least one display sub-area AA 1. The display panel 20 may further include a non-display area NA surrounding the display area AA in addition to the display area AA. The display sub-region AA1 may be understood as a local region in the display region AA that needs brightness compensation, and the position and number of the display sub-region AA1 are arbitrary, which is not limited in this embodiment of the present application.

As shown in fig. 3, the method for compensating brightness of a display panel provided in the embodiment of the present application includes the following steps: after the brightness compensation is performed on the display sub-region based on the first gamma curve, if the brightness values of the plurality of gray scales of the display sub-region in the first gray scale range are greater than the preset brightness threshold value, and the minimum gray scale value of the first gray scale range is greater than or equal to the preset gray scale threshold value, the steps S101 to S103 are performed.

S101, acquiring a plurality of first binding points in a first gray scale range.

S102, determining register values corresponding to the first bindings on the basis of a second gamma curve, wherein the gamma value of the second gamma curve is smaller than that of the first gamma curve.

And S103, performing brightness compensation on the display sub-area according to the register value and a predetermined compensation coefficient.

According to the embodiment of the application, for the display sub-region subjected to brightness compensation based on the first gamma curve, when the display sub-region is subjected to overcompensation in the first gray scale range, the register values corresponding to the first binding points in the first gray scale range are readjusted based on the second gamma curve with a smaller gamma value, so that the brightness compensation amount of each gray scale in the first gray scale range is reduced, the brightness value of the display sub-region subjected to brightness compensation of each gray scale in the first gray scale range is further reduced, the overcompensation problem of the display sub-region in the first gray scale range is improved, and the Mura phenomenon of the display panel in the first gray scale range is weakened or even eliminated.

For ease of understanding, the above steps are described in detail below.

In this embodiment of the present application, the first gamma curve may be a gamma curve with a specific gamma value, and may be flexibly adjusted according to actual display requirements, which is not limited in this embodiment of the present application. For example, when the display panel is required to conform to the gamma2.2 curve, the first gamma curve may be the gamma2.2 curve.

The brightness compensation based on the first gamma curve can be understood as two processes, namely, firstly, the gamma correction/debugging is carried out on the display panel based on the first gamma curve to obtain the register value after the gamma correction of each binding point; then, luminance compensation is performed on the basis of the gamma-corrected register value, and a (first) luminance-compensated register value is obtained.

It should be noted that the display panel may include a plurality of color sub-pixels, such as a red sub-pixel, a green sub-pixel, and a blue sub-pixel. For each binding/gray level, the register values of the binding/gray level may include register values of a plurality of color sub-pixels, such as may include a register value of a red sub-pixel, a register value of a green sub-pixel, and a register value of a blue sub-pixel. Of course, the display panel may include other color sub-pixels, such as a white sub-pixel, in addition to the red, green, and blue sub-pixels. Accordingly, the register value of each binding point/gray level may also include register values of other color sub-pixels, which is not limited in this embodiment.

The first gray scale range can be understood as a high gray scale range, wherein the minimum gray scale value of the first gray scale range is greater than or equal to a preset gray scale threshold value. The specific size of the first gray scale range and the preset gray scale threshold can be flexibly adjusted according to actual conditions, and the embodiment of the application is not limited to this. For example, when the first gray scale range is 145 to 255 gray scales, the predetermined gray scale threshold may be 145. For another example, when the first gray scale range is 200 to 255 gray scales, the predetermined gray scale threshold may be 200.

The brightness values of the plurality of gray scales of the display sub-region in the first gray scale range are greater than the preset brightness threshold, which can be understood as that the brightness values of the preset number of gray scales of the display sub-region in the first gray scale range are greater than the preset brightness threshold, that is, overcompensation, and the specific sizes of the preset number and the preset brightness threshold can be flexibly adjusted according to actual conditions, which is not limited in the embodiment of the present application. In some specific examples, each gray scale may correspond to a preset brightness threshold, and a brightness value of a preset number of gray scales greater than the preset brightness threshold may be understood as a brightness value of a preset number of gray scales greater than the corresponding preset brightness threshold. In other specific examples, there may be only one preset brightness threshold, for example, the preset brightness threshold may be a target brightness value corresponding to a maximum gray scale in the first gray scale range, and when a brightness value of a preset number of gray scales is greater than the target brightness value corresponding to the maximum gray scale in the first gray scale range, it may also be said that overcompensation occurs.

When performing the brightness compensation based on the first gamma curve, a first number of first binding points are selected for the brightness compensation, and the first number may be any number. Illustratively, for example, when performing the brightness compensation based on the first gamma curve, the gray levels of 0, 1, 8, 16, 24, 32, 40, 64, 80, 122, 144, 208, 240 and 255 are selected as the first tie points for the brightness compensation. Taking the first gray scale range of 145 to 255 gray scales as an example, the obtained plurality of binding points in the first gray scale range may include 208 gray scales, 240 gray scales and 255 gray scales.

In order to further improve the problem of overcompensation of the display sub-region in the first gray scale range, and reduce or even eliminate the Mura phenomenon of the display panel in the first gray scale range, as shown in fig. 4, in some embodiments, after S101 and before S102, the method may further include:

s101', a plurality of second binding points in the first gray scale range are obtained. The difference in gray scale values between at least one set of adjacent bindings in the second plurality of bindings is greater than the difference in gray scale values between at least one set of adjacent bindings in the first plurality of bindings.

Specifically, for example, a plurality of first binding points in the first gray scale range may be adjusted to obtain a plurality of adjusted second binding points.

Illustratively, the plurality of first binding points before adjustment are, for example, 208 gray levels, 240 gray levels and 255 gray levels, a difference value between the 208 gray levels and the 240 gray levels is 32 gray levels, and a difference value between the 240 gray levels and the 255 gray levels is 15 gray levels. By adjusting the gray level values of a plurality of first binding points, for example, the first binding point is adjusted from 208 gray levels to 192 gray levels, and the second binding point is adjusted from 240 gray levels to 224 gray levels. The difference between the 192 gray level and the 224 gray level is 32 gray levels, and the difference between the 224 gray level and the 255 gray level is 31 gray levels. Thus, the difference between the gray scale values of the second and third adjacent binding points (255 grayscales) is adjusted from 15 grayscales to 31 grayscales, i.e., the difference is increased.

From the perspective of brightness, it is assumed that the brightness value corresponding to 255 gray level is 450nit, the brightness value corresponding to 240 gray level is 400nit, and the brightness value corresponding to 224 gray level is 350 nit. The luminance difference between the 255 th gray level and the 240 th gray level is 50nit, and the 50nit is divided into 15 gray levels between the 255 th gray level and the 240 th gray level, and each gray level is divided into about 3.33 nit. Then, the luminance compensation is performed, and if the luminance compensation coefficient k is multiplied by 3.33, the luminance compensation amount is 3.33 × k. The luminance difference between the 255 th gray level and the 224 th gray level is 100nit, and the 100nit is divided into 31 gray levels between the 255 th gray level and the 224 th gray level, each gray level is divided into about 3.2 nit. Then, the luminance compensation is performed, and if the luminance compensation coefficient k is multiplied by 3.2, the luminance compensation amount is 3.2 × k. Obviously, after the difference of the gray scale values between the adjacent binding points is enlarged, the brightness compensation amount is reduced, and further the brightness value after the brightness compensation is further reduced, so that the problem of overcompensation of the display sub-region in the first gray scale range is further improved, and the Mura phenomenon of the display panel in the first gray scale range is weakened or even eliminated.

It should be noted that, when the brightness compensation method for a display panel provided in the embodiment of the present application includes S101' acquiring a plurality of second tie points in the first gray scale range, correspondingly, S102 specifically determines, based on the second gamma curve, register values corresponding to the plurality of second tie points. For convenience of description of the respective steps hereinafter, any one of the first binding and the second binding is not referred to as a third binding. That is, the third binding point in the embodiment of the present application may be understood as the first binding point or the second binding point. S102 will be described in detail below.

In an embodiment of the present application, the second gamma curve is a gamma curve having a gamma value smaller than that of the first gamma curve. For example, when the first gamma curve is a gamma2.2 curve, the second gamma curve may be a gamma2.0 curve or other gamma curve having a gamma value less than 2.2.

S102 may be understood as a process of performing gamma correction on the display panel, i.e., readjusting register values corresponding to respective gray levels of the display panel in the first gray level range. Specifically, as shown in fig. 5, in some embodiments, S102 may specifically include the following steps:

for any ith third binding point in a plurality of third binding points in the first gray scale range, wherein i is a positive integer, executing the following steps:

and S1021, determining the target brightness value of the ith third binding point according to the corresponding relation between the gray scale and the brightness value in the second gamma curve. Specifically, the gamma curve may be regarded as a corresponding relationship curve of gray scales and brightness values, and a brightness value corresponding to the ith third binding point (gray scale) in the second gamma curve may be used as a target brightness value of the ith third binding point.

S1022, an initial register value corresponding to the ith third binding point and a measurement brightness value corresponding to the ith third binding point in the initial register value are obtained.

Specifically, first, a register value of an ith third binding point obtained when gamma correction is performed based on the first gamma curve may be used as an initial register value corresponding to the ith third binding point, or an initial register value corresponding to the ith third binding point may be randomly set. It is easy to understand that the initial register value corresponding to the ith third binding point may include initial register values corresponding to sub-pixels of multiple colors, such as an initial register value R corresponding to a red sub-pixel₀Initial register value G corresponding to green sub-pixel₀Initial register value B corresponding to blue sub-pixel₀. After the initial register value corresponding to the ith third binding point is obtained, the initial register value corresponding to the ith third binding point may be input into the display panel, and then a measurement brightness value of the display panel is obtained by using an optical device such as a color analyzer, and the measurement brightness value is the brightness value of the display panel obtained by measurement.

And S1023, adjusting the initial register value to enable the difference value between the measured brightness value corresponding to the adjusted initial register value and the target brightness value to be within a preset error range.

The preset error range can be flexibly adjusted according to actual conditions, and the preset error range is not limited in the embodiment of the application. S1022 and S1023 may be an iterative process, that is, each time the initial register value is adjusted, a measurement brightness value is obtained, and the difference between the measurement brightness value and the target brightness value is determined to be within the preset error range, and the process is repeated until the difference between the measurement brightness value corresponding to the adjusted initial register value and the target brightness value is within the preset error range.

And S1024, taking the adjusted initial register value as a register value corresponding to the ith third binding point.

Therefore, the register value corresponding to the ith third binding point can be obtained. After the register value corresponding to one third binding point is obtained, the next third binding point may be used as the ith third binding point, and steps S1021 to S1024 may be repeated until the register values corresponding to the plurality of third binding points in the first gray scale range are obtained.

For the ith third binding point, a register value compensated by the ith third binding point can be obtained according to a register value corresponding to the ith third binding point and a predetermined compensation coefficient. The compensation coefficient may be a compensation coefficient obtained when performing brightness compensation based on the first gamma curve, or may be set manually according to actual conditions, which is not limited in the present application.

When the compensation coefficient is obtained by performing brightness compensation based on the first gamma curve, the compensation coefficient does not need to be determined again, and the compensation coefficient is obtained according to the display panel and is more matched with the display panel, so that the calculation amount is reduced, the brightness compensation rate is improved, and meanwhile, a better brightness compensation effect can be achieved.

In some specific embodiments, the compensation coefficient may include a difference between register values of each third binding point before and after the brightness compensation based on the first gamma curve, and the difference is referred to as a second difference for convenience of distinction. As described above, the brightness compensation based on the first gamma curve may include two processes, the first process is to perform gamma correction/debugging on the display panel based on the first gamma curve to obtain the gamma-corrected register values of the first binding points, and the gamma-corrected register values of the other gray scales except the first binding points may be obtained by a linear interpolation algorithm; the second process is to perform brightness compensation on the basis of the gamma-corrected register value to obtain a (first) brightness-compensated register value. Then, the register value of each third binding point before the brightness compensation based on the first gamma curve can be understood as the register value obtained by the first process, i.e., the register value of each third binding point after the gamma correction based on the first gamma curve. The register value of each third binding point after the brightness compensation based on the first gamma curve can be understood as the register value obtained by the second process.

Correspondingly, as shown in fig. 6, S103 may specifically include the following steps:

and S1031, obtaining the register value compensated by each third binding point according to the register value corresponding to each third binding point and the second difference value corresponding to each third binding point.

Specifically, for the ith third binding point, the register value compensated by the ith third binding point may be obtained according to the register value corresponding to the ith third binding point and the second difference value corresponding to the ith third binding point. For example, when the second difference is obtained by subtracting the register value before brightness compensation based on the first gamma curve from the register value after brightness compensation based on the first gamma curve, the sum of the register value corresponding to the ith third binding point and the second difference corresponding to the ith third binding point may be calculated to obtain the register value after brightness compensation of the ith third binding point. For another example, when the second difference is obtained by subtracting the register value after the brightness compensation based on the first gamma curve from the register value before the brightness compensation based on the first gamma curve, the difference between the register value corresponding to the ith third binding point and the second difference corresponding to the ith third binding point may be calculated to obtain the register value after the compensation of the ith third binding point.

And S1032, driving the sub-pixels of the corresponding colors in the display sub-area to emit light according to the register value compensated by each third binding point.

Each third-bind compensated register value may include a plurality of color sub-pixel compensated register values, such as a red sub-pixel compensated register value, a green sub-pixel compensated register value, and a blue sub-pixel compensated register value, at each third-bind. The corresponding relationship between the compensated register values of the sub-pixels of the plurality of colors and the binding points under each third binding point can be stored in the driving chip, and then the driving chip outputs data signals of corresponding voltage values to the sub-pixels of the corresponding colors based on the register values of the sub-pixels of each color during displaying so as to drive the sub-pixels of the corresponding colors in the display sub-area to emit light.

For the other gray scales except the third binding point in the first gray scale range, for example, the register value compensated by the multi-color sub-pixels under each gray scale can be obtained through linear interpolation, and then the corresponding relationship between the register value compensated by the multi-color sub-pixels under each gray scale and the gray scale is stored in the driving chip.

In other specific embodiments, the compensation coefficient may include a ratio (hereinafter, simply referred to as a ratio) between register values before and after the brightness compensation based on the first gamma curve for each third binding point. Correspondingly, as shown in fig. 7, S103 may specifically include the following steps:

and S1031', obtaining the register value compensated by each third binding point according to the register value corresponding to each third binding point and the ratio value corresponding to each third binding point.

Specifically, for the ith third binding point, the register value compensated by the ith third binding point can be obtained according to the register value corresponding to the ith third binding point and the ratio value corresponding to the ith third binding point. For example, the product of the register value corresponding to the ith third binding point and the ratio value corresponding to the ith third binding point may be calculated to obtain the register value compensated by the ith third binding point.

S1032', driving the sub-pixels of the corresponding color in the display sub-area to emit light according to the register value compensated by each third binding point.

The specific process of S1032' is the same as the specific process of step S1032, and is not repeated herein for brevity of description.

In order to improve the overcompensation problem of the display sub-region in the first gray scale range to a greater extent, in some embodiments, the gamma value of the second gamma curve can be flexibly adjusted according to the severity of the overcompensation, in other words, the gamma curve corresponding to the gamma value can be selected as the second gamma curve according to the severity of the overcompensation.

Specifically, as shown in fig. 8, before S102, the method may further include the steps of:

s1021', a first brightness value of the display sub-region under the target gray scale is obtained.

The target gray level can be flexibly selected according to actual conditions, and can be any gray level in the first gray level range, such as 254 gray level. Specifically, in S1011', a first brightness value, e.g., 450nit, of the display sub-region at the target gray scale may be measured and obtained by an optical device, such as a color analyzer.

S1022', a first gamma value corresponding to the first brightness value is obtained according to the first brightness value and the predetermined first corresponding relationship.

Wherein, the first corresponding relationship may be a corresponding relationship between the first brightness value and the first gamma value, and the expression of the first corresponding relationship may include:

wherein, the maximum gray scale and the brightness value corresponding to the maximum gray scale are known, and γ 1 represents the first gamma value. For example, through the first correspondence relationship shown in the above expression (2), a first gamma value, such as a gamma value of 2.7, corresponding to the first luminance value can be obtained.

S1023', a target gamma value is determined according to the gamma value of the first gamma curve and the first difference value. Wherein the first difference may be a difference between the first gamma value and a gamma value of the first gamma curve. Taking the first gamma value of 2.7 and the gamma value of the first gamma curve of 2.2 as an example, the first difference is 2.7-2.2 ═ 0.5. In some specific embodiments, determining the target gamma value according to the gamma value of the first gamma curve and the first difference may specifically include:

the method comprises the following steps of firstly, obtaining the product of a first difference value and a preset multiple;

a second step of obtaining a target gamma value according to a difference value between the gamma value of the first gamma curve and the product;

and a third step of selecting a gamma curve of the target gamma value as a second gamma curve.

The preset multiple can be obtained through experiments or historical data and is used for correcting the first difference value, and therefore the gamma value which finally accords with the over-compensation severity degree is obtained. Illustratively, the preset multiple may be, for example, 0.4, 0.5, or other values. Taking the preset multiple of 0.4 as an example, 2.2-0.5 × 0.4 ═ 2.0 can be obtained through the first step and the second step, i.e., the target gamma value can be 2.0.

S1024', a gamma curve of the target gamma value is selected as a second gamma curve.

In some specific embodiments, the gamma value of the second gamma curve may include 2.0.

Fig. 9 schematically shows an effect diagram after brightness compensation according to an embodiment of the application. As shown in fig. 9, in the high gray level (e.g. 145 to 255 gray levels), the gamma value (curve 2) corresponding to the luminance value after the luminance compensation is maintained at about the target gamma value (e.g. gamma value 2.2), i.e. the problem of the high gray level overcompensation is eliminated. In addition, for example, before the brightness compensation is performed based on the embodiment of the present application, the gamma values corresponding to 5 binding points are greater than the target gamma value, and after the brightness compensation is performed by the brightness compensation method provided by the embodiment of the present application, the deviation of the gamma values corresponding to the 5 binding points is reduced, and only the gamma value corresponding to one binding point (for example, 255 gray levels) is greater than the target gamma value, that is, the number of the binding points with the deviation of the gamma value is reduced, which further explains that the problem of the high gray level overcompensation is eliminated.

Based on the brightness compensation method of the display panel provided by the embodiment, correspondingly, the application also provides a specific implementation mode of the brightness compensation device of the display panel.

As shown in fig. 10, the brightness compensation apparatus 100 of the display panel provided in the embodiment of the present application includes the following modules:

the obtaining module 101 is configured to obtain a plurality of first binding points in a first gray scale range when a brightness compensation is performed on the display sub-region based on a first gamma curve and a brightness value of a plurality of gray scales of the display sub-region in the first gray scale range is greater than a preset brightness threshold; the minimum gray scale value of the first gray scale range is greater than or equal to a preset gray scale threshold value;

the first determining module 102 is configured to determine, based on a second gamma curve, register values corresponding to the plurality of first bindings, where a gamma value of the second gamma curve is smaller than a gamma value of the first gamma curve;

and the brightness compensation module 103 is configured to perform brightness compensation on the display sub-region according to the register value and a predetermined compensation coefficient.

The brightness compensation device of the display panel of the embodiment of the application, the display panel includes a display area and a non-display area, the display area includes at least one display sub-area, the brightness compensation device of the display panel includes: the obtaining module 101 is configured to obtain a plurality of first binding points in a first gray scale range when a brightness compensation is performed on the display sub-region based on a first gamma curve and a brightness value of a plurality of gray scales of the display sub-region in the first gray scale range is greater than a preset brightness threshold; the minimum gray scale value of the first gray scale range is greater than or equal to a preset gray scale threshold value; the first determining module 102 is configured to determine, based on a second gamma curve, register values corresponding to the plurality of first bindings, where a gamma value of the second gamma curve is smaller than a gamma value of the first gamma curve; and the brightness compensation module 103 is configured to perform brightness compensation on the display sub-region according to the register value and a predetermined compensation coefficient. That is, for the display sub-region subjected to brightness compensation based on the first gamma curve, when the display sub-region is overcompensated in the first gray scale range, the embodiment of the present application readjusts the register value corresponding to each binding point in the first gray scale range based on the second gamma curve with a smaller gamma value, so as to reduce the brightness compensation amount of each gray scale in the first gray scale range, and further reduce the brightness value of the display sub-region subjected to brightness compensation of each gray scale in the first gray scale range, thereby improving the overcompensation problem of the display sub-region in the first gray scale range, and weakening or even eliminating the Mura phenomenon of the display panel in the first gray scale range.

In some embodiments, the apparatus 100 for compensating brightness of a display panel according to an embodiment of the present application may further include a second tie point obtaining module, configured to obtain a plurality of second tie points in the first gray scale range, where a difference in gray scale values between at least one set of adjacent tie points in the plurality of second tie points is greater than a difference in gray scale values between at least one set of adjacent tie points in the plurality of first tie points. Accordingly, the first determining module 102 is specifically configured to determine, based on the second gamma curve, register values corresponding to the adjusted plurality of second bindings.

In some embodiments, the brightness compensation apparatus 100 of the display panel provided in the embodiment of the present application may further include a second gamma curve selection module, configured to measure a first brightness value of the display sub-region under the target gray scale; obtaining a first gamma value corresponding to the first brightness value according to the first brightness value and a predetermined first corresponding relationship, wherein the first corresponding relationship is a corresponding relationship between the first brightness value and the first gamma value; determining a target gamma value according to the gamma value of the first gamma curve and a first difference value, wherein the first difference value is the difference value between the first gamma value and the gamma value of the first gamma curve; and selecting a gamma curve of the target gamma value as a second gamma curve.

In some embodiments, the second gamma curve selecting module is specifically configured to obtain a product of the first difference and a preset multiple; and obtaining a target gamma value according to the difference between the gamma value of the first gamma curve and the product.

In some embodiments, any one of the first and second bindings is a third binding, and the compensation factor includes a second difference between a register value of each third binding before the brightness compensation based on the first gamma curve and a register value after the brightness compensation based on the first gamma curve. The brightness compensation module 103 is specifically configured to obtain a register value compensated by each third binding point according to the register value corresponding to each third binding point and a second difference value corresponding to each third binding point; and driving the sub-pixels of the corresponding color in the display sub-area to emit light according to the register value compensated by each third binding point.

In some embodiments, any one of the first and second bindings is a third binding, and the compensation factor includes a ratio between a register value of each third binding before the brightness compensation based on the first gamma curve and a register value after the brightness compensation based on the first gamma curve. The brightness compensation module 103 is specifically configured to obtain a register value compensated by each third binding point according to the register value corresponding to each third binding point and a ratio corresponding to each third binding point; and driving the sub-pixels of the corresponding color in the display sub-area to emit light according to the register value compensated by each third binding point.

In some embodiments, the first determining module 102 is specifically configured to, for any ith third binding point of the plurality of third binding points, perform the following steps:

determining a target brightness value of the ith third binding point according to the corresponding relation between the gray scale and the brightness value in the second gamma curve;

acquiring an initial register value corresponding to the ith third binding point and a measurement brightness value corresponding to the ith third binding point in the initial register value;

adjusting the initial register value to enable the difference value between the measurement brightness value corresponding to the adjusted initial register value and the target brightness value to be within a preset error range;

and taking the adjusted initial register value as a register value corresponding to the ith third binding point, wherein i is a positive integer.

Each module/unit in the apparatus shown in fig. 10 has a function of implementing each step in each drawing of the above method embodiment, and can achieve its corresponding technical effect, and for brevity, no further description is given here.

Based on the brightness compensation method of the display panel provided by the embodiment, correspondingly, the application further provides a specific implementation manner of the electronic device. Please see the examples below.

Fig. 11 shows a hardware structure diagram of an electronic device provided in an embodiment of the present application.

The electronic device may include a processor 1101 and a memory 1102 in which computer program instructions are stored.

Specifically, the processor 1101 may include a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement the embodiments of the present Application.

Memory 1102 may include mass storage for data or instructions. By way of example, and not limitation, memory 1102 may include a Hard Disk Drive (HDD), a floppy Disk Drive, flash memory, an optical Disk, a magneto-optical Disk, tape, or a Universal Serial Bus (USB) Drive or a combination of two or more of these. In one example, memory 1102 can include removable or non-removable (or fixed) media, or memory 1102 is non-volatile solid-state memory. The memory 1102 may be internal or external to the integrated gateway disaster recovery device.

In one example, Memory 1102 may be a Read Only Memory (ROM). In one example, the ROM may be mask programmed ROM, programmable ROM (prom), erasable prom (eprom), electrically erasable prom (eeprom), electrically rewritable ROM (earom), or flash memory, or a combination of two or more of these.

Memory 1102 may include Read Only Memory (ROM), Random Access Memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical, or other physical/tangible memory storage devices. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software comprising computer-executable instructions and when the software is executed (e.g., by one or more processors), it is operable to perform operations described with reference to the methods according to an aspect of the application.

The processor 1101 reads and executes the computer program instructions stored in the memory 1102 to implement the methods/steps S101 to S103 in the embodiment shown in fig. 3, and achieve the corresponding technical effects achieved by the implementation of the methods/steps in the example shown in fig. 3, which are not described herein again for brevity.

In one example, the electronic device can also include a communication interface 1103 and a bus 1110. As shown in fig. 11, the processor 1101, the memory 1102, and the communication interface 1103 are connected via a bus 1110 to complete communication therebetween.

The communication interface 1103 is mainly used for implementing communication between modules, apparatuses, units and/or devices in this embodiment of the present application.

Bus 1110 includes hardware, software, or both to couple the components of the electronic device to one another. By way of example, and not limitation, a Bus may include an Accelerated Graphics Port (AGP) or other Graphics Bus, an Enhanced Industry Standard Architecture (EISA) Bus, a Front-Side Bus (Front Side Bus, FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) Bus, an infiniband interconnect, a Low Pin Count (LPC) Bus, a memory Bus, a Micro Channel Architecture (MCA) Bus, a Peripheral Component Interconnect (PCI) Bus, a PCI-Express (PCI-X) Bus, a Serial Advanced Technology Attachment (SATA) Bus, a video electronics standards association local (VLB) Bus, or other suitable Bus or a combination of two or more of these. Bus 1110 can include one or more buses, where appropriate. Although specific buses are described and shown in the embodiments of the application, any suitable buses or interconnects are contemplated by the application.

In addition, in combination with the brightness compensation method of the display panel in the foregoing embodiments, the embodiments of the present application may provide a computer-readable storage medium to implement the method. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement a brightness compensation method for a display panel of any of the above embodiments. Examples of computer readable storage media include non-transitory computer readable storage media such as electronic circuits, semiconductor memory devices, ROMs, random access memories, flash memories, erasable ROMs (eroms), floppy disks, CD-ROMs, optical disks, and hard disks.

It is to be understood that the present application is not limited to the particular arrangements and instrumentality described above and shown in the attached drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present application.

The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic Circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.

It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.

Aspects of the present application are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware for performing the specified functions or acts, or combinations of special purpose hardware and computer instructions.

As described above, only the specific embodiments of the present application are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.

Claims

1. A method for compensating brightness of a display panel, wherein the display panel comprises a display area, and the display area comprises at least one display sub-area, the method comprising:

after the display sub-region performs brightness compensation based on a first gamma curve, if the brightness values of a plurality of gray scales of the display sub-region in a first gray scale range are greater than a preset brightness threshold value, and the minimum gray scale value of the first gray scale range is greater than or equal to a preset gray scale threshold value, executing the following steps:

acquiring a plurality of first binding points in the first gray scale range;

determining register values corresponding to the plurality of first bindings based on a second gamma curve, wherein the gamma value of the second gamma curve is smaller than the gamma value of the first gamma curve;

and performing brightness compensation on the display sub-area according to the register value and a predetermined compensation coefficient.

2. The method of claim 1, further comprising, after said obtaining a plurality of first bindings in the first gray scale range and before said determining, based on the second gamma curve, respective register values corresponding to the plurality of first bindings:

acquiring a plurality of second binding points in the first gray scale range, wherein the difference of gray scale values between at least one group of adjacent binding points in the plurality of second binding points is larger than the difference of gray scale values between at least one group of adjacent binding points in the plurality of first binding points;

the determining, based on the second gamma curve, register values corresponding to the plurality of first bindings specifically includes:

based on the second gamma curve, determining register values corresponding to the second bindings.

3. The method of claim 1, further comprising, prior to said determining, based on the second gamma curve, register values corresponding to respective ones of the plurality of first bindings:

acquiring a first brightness value of the display sub-region under a target gray scale;

obtaining a first gamma value corresponding to the first brightness value according to the first brightness value and a predetermined first corresponding relationship, wherein the first corresponding relationship is a corresponding relationship between the first brightness value and the first gamma value;

determining a target gamma value according to the gamma value of the first gamma curve and a first difference value, wherein the first difference value is the difference value between the first gamma value and the gamma value of the first gamma curve;

selecting a gamma curve of the target gamma value as the second gamma curve;

preferably, the expression of the first correspondence relationship includes:

4. The method according to claim 3, wherein determining a target gamma value according to the gamma value of the first gamma curve and the first difference value comprises:

obtaining the product of the first difference value and a preset multiple;

and obtaining the target gamma value according to the difference between the gamma value of the first gamma curve and the product.

5. The method of claim 2, wherein any one of the first and second bindings is a third binding, and wherein the compensation factor comprises a second difference between a register value of each of the third bindings before and after the brightness compensation based on the first gamma curve;

performing brightness compensation on the display sub-region according to the register value and a predetermined compensation coefficient, specifically comprising:

obtaining a compensated register value of each third binding point according to the register value corresponding to each third binding point and the second difference value corresponding to each third binding point;

and driving the sub-pixels of the corresponding color in the display sub-area to emit light according to the register value compensated by each third binding point.

6. The method of claim 2, wherein any one of the first and second bindings is a third binding, and wherein the compensation factor comprises a ratio between a register value of each of the third bindings before the brightness compensation based on the first gamma curve and a register value after the brightness compensation based on the first gamma curve;

obtaining a register value compensated by each third binding point according to the register value corresponding to each third binding point and the ratio value corresponding to each third binding point;

7. The method according to claim 2, wherein any one of the first and second bindings is a third binding, and wherein determining the register values corresponding to the first bindings based on the second gamma curve specifically comprises:

for any ith third binding point of the plurality of third binding points, performing the steps of:

determining a target brightness value of the ith third binding point according to a corresponding relation between gray scales and brightness values in the second gamma curve;

acquiring an initial register value corresponding to the ith third binding point and a measurement brightness value corresponding to the ith third binding point at the initial register value;

8. A method according to any of claims 5 to 7, wherein each of said third binding compensated register values comprises a red sub-pixel compensated register value, a green sub-pixel compensated register value and a blue sub-pixel compensated register value for each of said third binding;

the driving, according to the register value compensated by each third binding point, the sub-pixels of the corresponding color in the display sub-region to emit light specifically includes:

driving the red sub-pixels in the display sub-area to emit light according to the register value compensated by the red sub-pixels;

driving the green sub-pixels in the display sub-area to emit light according to the register value compensated by the green sub-pixels;

and driving the blue sub-pixels in the display sub-area to emit light according to the register values compensated by the blue sub-pixels.

9. An apparatus for compensating brightness of a display panel, the display panel comprising a display area, the display area comprising at least one display sub-area, the apparatus comprising:

the acquisition module is used for acquiring a plurality of first binding points in a first gray scale range under the condition that the brightness value of a plurality of gray scales of the display sub-region in the first gray scale range is greater than a preset brightness threshold value after the display sub-region performs brightness compensation based on a first gamma curve; the minimum gray scale value of the first gray scale range is greater than or equal to a preset gray scale threshold value;

a first determining module, configured to determine, based on a second gamma curve, register values corresponding to the plurality of first bindings, where a gamma value of the second gamma curve is smaller than a gamma value of the first gamma curve;

and the brightness compensation module is used for performing brightness compensation on the display sub-area according to the register value and a predetermined compensation coefficient.

10. An electronic device, characterized in that the electronic device comprises: processor, memory and computer program stored on the memory and executable on the processor, which computer program, when being executed by the processor, carries out the steps of the brightness compensation method of a display panel as claimed in any one of the claims 1 to 8.