CN115552506A

CN115552506A - Display screen brightness adjusting method and device

Info

Publication number: CN115552506A
Application number: CN202080100632.9A
Authority: CN
Inventors: 彭德彰; 许景翔; 刘洋; 韦育伦
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2022-12-30
Also published as: WO2021232198A1

Abstract

A display screen brightness adjusting method and device. According to a first corresponding relation, determining a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in a display screen after a Display Brightness Value (DBV) is adjusted, wherein the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel before the DBV is adjusted (S11); determining target brightness corresponding to each pixel in a mura area of the display screen after the DBV is adjusted according to the second corresponding relation (S12); the brightness of each pixel in the mura area is adjusted to the corresponding target brightness (S13). After the DBV is adjusted, the corresponding relation between the gray scale and the brightness of each pixel in the display screen is more consistent with the characteristics of human eyes when the corresponding relation accords with the second corresponding relation, the accuracy of demura processing can be improved, the compensation error of brightness compensation on a mura area is reduced, the phenomenon of uneven pictures in the display screen is reduced, the display quality of the display screen is improved, and the use experience of a user when the display screen is used is improved.

Description

Display screen brightness adjusting method and device

Technical Field

The invention relates to the technical field of terminal equipment, in particular to a display screen brightness adjusting method and device.

Background

With the continuous development of terminal technology, a variety of terminal devices are in operation, many of which include a display screen, such as a computer, a mobile phone, a television, and the like. However, due to the influence of the non-uniform distribution of backlight light sources, the drift of semiconductor manufacturing processes, the different characteristics of light-emitting materials, and the like, some display screens have non-uniform brightness. For example, some display screens have a high brightness in the middle and a low brightness at the left and right ends. Among them, an area in which brightness is not uniform in the display screen is generally called a mura area.

Because the mura area can influence the picture display effect of the display screen and reduce the user experience, the mura area needs to be subjected to brightness compensation so as to eliminate the mura area in the display screen. Among them, the technique of eliminating the mura area in the display screen is generally called a demura technique.

The brightness of the display on the display screen is related to the current Display Brightness Value (DBV) of the display screen. Wherein the DBV is used to indicate the maximum achievable brightness value for each pixel in the display screen. In addition, in the using process of the terminal equipment, a user can adjust the DBV of the display screen. For example, when the ambient environment is dark, in order to avoid eye discomfort caused by too strong brightness of the display screen, the user may turn down the DBV of the display screen to make the brightness of the display screen softer. After the DBV of the display screen is adjusted, the demura processing needs to be performed again on the mura areas in the display screen. In the prior art, when demura processing is performed on a display screen after a DBV is adjusted, it is generally considered that brightness changes of pixels in the display screen before and after the DBV is adjusted present a linear relationship, and brightness compensation is performed on a mura area after the DBV is adjusted based on the linear relationship.

However, before and after the DBV is adjusted, the change of each brightness in the display screen does not show a linear relationship, and therefore, after the display screen after the DBV is adjusted is subjected to demura processing by the prior art, the brightness in the display screen is still uneven, that is, a mura area still exists in the display screen.

Disclosure of Invention

In order to solve the problem that after demura processing is performed on a display screen after a DBV is adjusted through the prior art, a mura area still exists in the display screen, embodiments of the present application provide a method and an apparatus for adjusting brightness of a display screen.

In a first aspect, an embodiment of the present application discloses a method for adjusting brightness of a display screen, including:

determining a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in the display screen after the DBV is adjusted according to the first corresponding relation, wherein the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted; determining target brightness corresponding to each pixel in a mura area of the display screen after the DBV is adjusted according to the second corresponding relation; and adjusting the brightness of each pixel in the mura area to be the target brightness corresponding to each pixel.

In the scheme of the embodiment of the application, a first corresponding relation between the brightness and the gray scale of each pixel before DBV adjustment is utilized to determine a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in a display screen after the DBV adjustment, and then the second corresponding relation is utilized to perform brightness compensation on the pixels in the mura area. In addition, after the DBV is adjusted, the corresponding relation between the gray scale and the brightness of each pixel in the display screen is more in line with the characteristics of human eyes when the corresponding relation is in line with the second corresponding relation. Therefore, the target brightness of the pixels in the mura area to be adjusted is determined through the second corresponding relation, the accuracy of the demura processing can be improved, and the compensation error of brightness compensation on the pixels in the mura area is reduced.

In an optional design, the first corresponding relationship is specifically used to indicate a corresponding relationship between the brightness of each pixel in the display screen, the DBV before adjustment, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen, and the first gamma value before DBV adjustment; the second correspondence is specifically used for indicating a correspondence between the brightness of each pixel in the display screen, the adjusted DBV, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen, and the second gamma value after the DBV is adjusted.

In an optional design, the determining, according to the first corresponding relationship, a second corresponding relationship between the brightness and the gray scale of each pixel in a non-mura area of the display screen after the display brightness value DBV is adjusted includes:

determining a second gamma value in the second corresponding relation according to a first gamma value in the first corresponding relation, wherein the difference value of the first gamma value and the second gamma value is within a preset range; and determining the second corresponding relation according to the second gamma value and the adjusted DBV.

In an alternative design, the first corresponding relationship is: (brightness of pixel/maximum brightness corresponding to DBV before adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g1 (ii) a The second corresponding relation is as follows: (brightness of pixel/maximum brightness corresponding to DBV after adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g2 (ii) a Wherein g1 is the first gamma value and g2 is the second gamma value.

In an optional design, the determining, according to the second correspondence, target luminances corresponding to respective pixels in a mura area of the display screen after the DBV is adjusted includes:

and determining the brightness of each pixel in the mura area corresponding to the gray scale in the second corresponding relation, wherein the brightness of each pixel corresponding to the gray scale in the second corresponding relation is the target brightness of each pixel.

Through the steps, the terminal equipment can determine the target brightness corresponding to the pixels in the mura area of the display screen after the DBV is adjusted, and the target brightness corresponding to the pixels is calculated in real time according to the relational expression of the second corresponding relation, so that the accuracy of determining the target brightness is high.

In an optional design, the second correspondence includes n gray scales and n luminances corresponding to the n gray scales, where n is a positive integer, and the determining, according to the second correspondence, a target luminance corresponding to each pixel in a mura area of the display screen after the DBV is adjusted includes:

when the first gray scale of the first pixel in the mura area belongs to the n gray scales, determining that the corresponding brightness of the first gray scale in the second corresponding relation is the target brightness of the first pixel, wherein the first pixel is any one pixel in the mura area; when the first gray scale of the first pixel in the mura area does not belong to the n gray scales, performing interpolation processing on the n gray scales and n luminances corresponding to the n gray scales respectively to determine a first luminance corresponding to the first gray scale, wherein the first luminance is a target luminance of the first pixel.

Through the steps, the terminal equipment can determine the target brightness corresponding to the pixels in the mura area of the display screen after the DBV is adjusted, so that demura processing can be realized according to the target brightness. In addition, the terminal equipment only needs to store n gray scales and n brightness corresponding to the n gray scales in the second corresponding relation, so that the mode occupies a small storage space. In addition, according to the scheme, the target brightness is determined according to the n gray scales and the brightness corresponding to the n gray scales in the second corresponding relation, and real-time calculation is not needed through the corresponding relation between the gray scales and the brightness, so that the calculation amount is small, and correspondingly, the efficiency of determining the target brightness of the first pixel is improved.

determining a second brightness corresponding to a second gray scale of a second pixel in the mura area in the second corresponding relation, wherein the second pixel is any one pixel in the mura area; determining a third gray scale corresponding to the second brightness in the first corresponding relation; determining a first gain value according to the second gray scale and the third gray scale, wherein the product of the first gain value and the third gray scale is a first target gray scale; determining third brightness corresponding to the first target gray scale in the first corresponding relation; determining the third brightness as a target brightness of the second pixel.

In an optional design, the first corresponding relationship includes m gray scales and m luminances corresponding to the m gray scales, where m is a positive integer, and the determining a third luminance corresponding to the first target gray scale in the first corresponding relationship includes:

when the first target gray scale belongs to the m gray scales, determining the third brightness as the brightness corresponding to the first target gray scale in the first corresponding relation; when the first target gray scale does not belong to the m gray scales, determining the third brightness as the brightness determined after interpolation processing is performed on the m gray scales and m brightness corresponding to the m gray scales respectively.

Through the steps, the terminal equipment can determine the target brightness corresponding to the pixels in the mura area of the display screen after the DBV is adjusted, so that demura processing can be realized according to the target brightness. In addition, the terminal equipment only needs to store m gray scales and m brightness corresponding to the m gray scales in the second corresponding relation respectively, so that the mode occupies a small storage space. In addition, according to the scheme, the target brightness is determined according to the m gray scales and the brightness corresponding to the m gray scales in the first corresponding relation, and real-time calculation is not needed through the corresponding relation between the gray scales and the brightness, so that the calculation amount is small, and correspondingly, the efficiency of determining the target brightness of the first pixel is improved.

In an alternative design, the determining a first gain value according to the second gray level and the third gray level includes:

determining the ratio of the third gray scale to the second gray scale as the first gain value; or determining the ratio of the third gray scale to the second gray scale; and in a preset first mapping relation, determining a gain value corresponding to the ratio of the third gray scale to the second gray scale as the first gain value, wherein the preset first mapping relation is a mapping relation between different ratios and corresponding gain values.

determining a second gain value according to the maximum brightness corresponding to the DBV before adjustment and the maximum brightness corresponding to the DBV after adjustment; determining a third gain value according to the maximum brightness corresponding to the adjusted DBV and the second gain value; determining a product of a gray scale of a third pixel in the mura area and the third gain value as a second target gray scale, wherein the third pixel is any one pixel in the mura area; determining a fourth brightness corresponding to the second target gray scale in the first corresponding relation; determining the fourth brightness as a target brightness of the third pixel.

In an optional design, the first corresponding relationship includes r gray scales and r luminances corresponding to the r gray scales, r is a positive integer, and the determining a fourth luminance corresponding to the second target gray scale in the first corresponding relationship includes:

when the second target gray scale belongs to the r gray scales, determining the fourth brightness as the brightness corresponding to the second target gray scale in the first corresponding relation; and when the second target gray scale does not belong to the r gray scales, determining the fourth brightness as the brightness determined by performing interpolation processing on the r gray scales and r brightnesses respectively corresponding to the r gray scales.

Through the steps, the terminal equipment can determine the target brightness corresponding to the pixels in the mura area of the display screen after the DBV is adjusted, so that demura processing can be realized according to the target brightness. In addition, the terminal equipment only needs to store r gray scales and r brightness corresponding to the r gray scales in the second corresponding relation, so that the storage space occupied by the method is small. In addition, according to the scheme, the target brightness is determined according to the r gray scales and the brightness corresponding to the r gray scales in the second corresponding relation, and real-time calculation is not needed through the corresponding relation between the gray scales and the brightness, so that the calculation amount is small, and correspondingly, the efficiency of determining the target brightness of the first pixel is improved.

In an optional design, when the second target gray scale is larger than the gray scale of the display screen, the determining a fourth brightness corresponding to the second target gray scale in the first corresponding relationship includes:

and determining that the maximum brightness which can be displayed by the display screen after the DBV is adjusted is the fourth brightness.

In an optional design, the determining a second gain value according to the maximum brightness corresponding to the DBV before the adjustment and the maximum brightness corresponding to the DBV after the adjustment includes:

determining the ratio of the maximum brightness corresponding to the DBV after adjustment to the maximum brightness corresponding to the DBV before adjustment as the second gain value; or, in a preset second mapping relationship, determining a gain value corresponding to a ratio of the maximum brightness corresponding to the adjusted DBV to the maximum brightness corresponding to the pre-adjusted DBV as the second gain value, where the preset second mapping relationship is a mapping relationship between different ratios and corresponding gain values.

In an alternative design, the determining a third gain value according to the adjusted DBV and the second gain value includes:

determining a third gain value by: gain1= ((MaxDBV-MinDBV)/(CurrentDBV-MinDBV)) × EndPointGain; and the EndPointGain is the second gain value, minDBV is the maximum brightness corresponding to the minimum DBV of the display screen, maxDBV is the maximum brightness corresponding to the maximum DBV of the display screen, and CurrentDBV is the maximum brightness corresponding to the adjusted DBV.

In a second aspect, an embodiment of the present application provides a display screen brightness adjusting apparatus, including: the processing unit is used for determining a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in the display screen after the DBV is adjusted according to a first corresponding relation, wherein the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel in the display screen before the DBV is adjusted; the processing unit is further configured to determine, according to the second correspondence, target brightness corresponding to each pixel in a mura area of the display screen after the DBV is adjusted; and the brightness adjusting unit is used for adjusting the brightness of each pixel in the mura area to the target brightness corresponding to each pixel.

In an optional design, the processing unit is specifically configured to determine, according to a first gamma value in the first corresponding relationship, a second gamma value in the second corresponding relationship, where a difference between the first gamma value and the second gamma value is within a preset range;

and determining the second corresponding relation according to the second gamma value and the adjusted DBV.

In an alternative design, the first corresponding relationship is: (brightness of pixel/maximum brightness corresponding to DBV before adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g1 (ii) a The second corresponding relation is as follows: (Brightness of pixel/adjusted DBV correspondenceMaximum brightness of) = (gray scale of pixel/maximum gray scale of display screen) ^g2 (ii) a Wherein g1 is the first gamma value and g2 is the second gamma value.

In an optional design, the processing unit is specifically configured to determine respective corresponding luminances of gray scales of each pixel in the mura area in the second corresponding relationship, where the respective corresponding luminances of the gray scales of each pixel in the second corresponding relationship are target luminances corresponding to the respective pixels.

In an optional design, the second correspondence includes n gray scales and n luminances corresponding to the n gray scales, where n is a positive integer; the processing unit is specifically configured to: when the first gray scale of the first pixel in the mura area belongs to the n gray scales, determining that the corresponding brightness of the first gray scale in the second corresponding relation is the target brightness of the first pixel, wherein the first pixel is any one pixel in the mura area; when the first gray scale of the first pixel in the mura area does not belong to the n gray scales, performing interpolation processing on the n gray scales and n luminances corresponding to the n gray scales respectively to determine a first luminance corresponding to the first gray scale, wherein the first luminance is a target luminance of the first pixel.

In an alternative design, the processing unit is specifically configured to: determining a second brightness corresponding to a second gray scale of a second pixel in the mura area in the second corresponding relation, wherein the second pixel is any one pixel in the mura area; determining a third gray scale corresponding to the second brightness in the first corresponding relation; determining a first gain value according to the second gray scale and the third gray scale, wherein the product of the first gain value and the third gray scale is a first target gray scale; determining a third brightness corresponding to the first target gray scale in the first corresponding relation; determining the third brightness as a target brightness of the second pixel.

In an optional design, the first correspondence includes m gray scales and m luminances corresponding to the m gray scales, where m is a positive integer; the processing unit is specifically configured to: when the first target gray scale belongs to the m gray scales, determining the third brightness as the brightness corresponding to the first target gray scale in the first corresponding relation; when the first target gray scale does not belong to the m gray scales, determining the third brightness as the brightness determined after interpolation processing is performed on the m gray scales and m brightness corresponding to the m gray scales respectively.

In an optional design, the processing unit is specifically configured to determine a ratio of the third gray scale to the second gray scale as the first gain value; or, the processing unit is specifically configured to: determining a ratio of the third gray scale to the second gray scale; and determining a gain value corresponding to the ratio of the third gray scale to the second gray scale as the first gain value in a preset first mapping relation, wherein the preset first mapping relation is a mapping relation between different ratios and corresponding gain values.

In an alternative design, the processing unit is specifically configured to: determining a second gain value according to the maximum brightness corresponding to the DBV before adjustment and the maximum brightness corresponding to the DBV after adjustment; determining a third gain value according to the maximum brightness corresponding to the adjusted DBV and the second gain value; determining that a product of a gray scale of a third pixel in the mura area and the third gain value is a second target gray scale, wherein the third pixel is any one pixel in the mura area; determining a fourth brightness corresponding to the second target gray scale in the first corresponding relation; determining the fourth brightness as a target brightness of the third pixel.

In an optional design, the first correspondence includes r gray scales and r luminances corresponding to the r gray scales, respectively, where r is a positive integer; the processing unit is specifically configured to: when the second target gray scale belongs to the r gray scales, determining the fourth brightness as the brightness corresponding to the second target gray scale in the first corresponding relation; when the second target gray scale does not belong to the r gray scales, determining the fourth brightness as a brightness determined by performing interpolation processing on the r gray scales and r brightnesses respectively corresponding to the r gray scales.

In an optional design, when the second target gray scale is larger than the gray scale of the display screen, the processing unit is specifically configured to determine that the maximum brightness that can be displayed by the display screen after the DBV adjustment is the fourth brightness.

In an alternative design, the processing unit is specifically configured to: determining the ratio of the maximum brightness corresponding to the DBV after adjustment to the maximum brightness corresponding to the DBV before adjustment as the second gain value; or, the processing unit is specifically configured to determine, in a preset second mapping relationship, that a gain value corresponding to a ratio of a maximum brightness corresponding to the adjusted DBV to a maximum brightness corresponding to the pre-adjusted DBV is the second gain value, where the preset second mapping relationship is a mapping relationship between different ratios and corresponding gain values.

In an alternative design, the processing unit is specifically configured to determine the third gain value by the following formula:

gain1= ((MaxDBV-MinDBV)/(CurrentDBV-MinDBV)) × EndPointGain; and the EndPointGain is the second gain value, minDBV is the maximum brightness corresponding to the minimum DBV of the display screen, maxDBV is the maximum brightness corresponding to the maximum DBV of the display screen, and CurrentDBV is the maximum brightness corresponding to the adjusted DBV.

In a third aspect, an embodiment of the present application provides a display screen brightness adjusting apparatus. The apparatus comprises a processor configured to invoke program instructions stored in a memory to perform the method of the first aspect and a transmission interface.

In a fourth aspect, an embodiment of the present application provides a display screen brightness adjusting apparatus, including:

a display driving integrated circuit DDIC and an application processor AP;

the AP is used for determining the adjusted display brightness value DBV and determining a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in the display screen after the display brightness value DBV is adjusted according to a first corresponding relation, wherein the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted; the AP is further used for determining the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted according to the second corresponding relation;

and the DDIC is used for adjusting the brightness of each pixel in the mura area to be the target brightness corresponding to each pixel.

In an alternative design, further comprising: a memory;

the memory is used for storing a first corresponding relation and a second corresponding relation;

the first corresponding relation is a corresponding relation between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted, and the second corresponding relation is a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area of the display screen after the DBV is adjusted.

In a fifth aspect, an embodiment of the present application provides a display screen brightness adjusting apparatus, including:

a display driving integrated circuit DDIC and an application processor AP;

the AP is used for determining an adjusted display brightness value DBV;

the DDIC is to: determining a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in the display screen after the DBV is adjusted according to the first corresponding relation, wherein the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted; determining target brightness corresponding to each pixel in a mura area of the display screen after the DBV is adjusted according to the second corresponding relation; and adjusting the brightness of each pixel in the mura area to be the target brightness corresponding to each pixel.

In an alternative design, the method further comprises: a memory;

In a sixth aspect, an embodiment of the present application provides a display screen brightness adjustment apparatus, including:

a display driving integrated circuit DDIC and an application processor AP;

the AP is used for determining an adjusted display brightness value DBV;

the DDIC and the AP are used together to: determining a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in the display screen after the DBV is adjusted according to the first corresponding relation, wherein the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted; and determining the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted according to the second corresponding relation.

And the DDIC is also used for adjusting the brightness of each pixel in the mura area to the target brightness corresponding to each pixel.

In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium for storing instructions, which when executed on a computer or a processor, cause the computer or the processor to implement the method according to the first aspect.

In an eighth aspect, embodiments of the present application provide a computer program product including instructions, which, when run on an electronic device, enable the electronic device to implement all or part of the steps in the corresponding embodiments of the first aspect.

In the scheme of the embodiment of the application, a first corresponding relation between the brightness and the gray scale of each pixel before DBV adjustment is utilized to determine a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in a display screen after the DBV adjustment, and then the second corresponding relation is utilized to perform brightness compensation on the pixels in the mura area. In addition, after the DBV is adjusted, the corresponding relation between the gray scale and the brightness of each pixel in the display screen is more in line with the characteristics of human eyes when the corresponding relation accords with the second corresponding relation. Therefore, the target brightness of the pixels in the mura area to be adjusted is determined through the second corresponding relation, the accuracy of the demura processing can be improved, and the compensation error of brightness compensation on the pixels in the mura area is reduced.

Furthermore, due to the fact that the accuracy of demura processing is improved and the phenomenon that pictures in the display screen are not uniform is reduced, the display quality of the display screen can be improved, and the use experience of a user when the user uses the display screen is improved.

In addition, after demura processing is performed on the display screen after DBV adjustment by the conventional technique, the display screen may still have uneven brightness, and thus it is difficult to check and accept the display screen with image quality (PQ). Wherein, the PQ acceptance refers to the display effect of the display screen observed by naked eyes, and whether the display quality of the display screen meets the standard or not is determined.

According to the scheme provided by the embodiment of the application, the display quality of the display screen is improved, and correspondingly, the passing rate of the display screen passing through the PQ acceptance is also improved.

Drawings

Fig. 1 is a schematic view of a work flow of a method for adjusting brightness of a display screen disclosed in an embodiment of the present application;

FIG. 2 is a diagram illustrating a relationship curve of a first corresponding relationship according to an embodiment of the disclosure;

FIG. 3 is a diagram illustrating a relationship curve of a second corresponding relationship disclosed in an embodiment of the present application;

fig. 4 is a schematic diagram of a workflow of determining target brightness in a display screen brightness adjustment method disclosed in an embodiment of the present application;

fig. 5 is a schematic view of another workflow for determining target brightness in a method for adjusting brightness of a display screen according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a display screen brightness adjusting apparatus disclosed in an embodiment of the present application;

fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a display screen brightness adjustment system disclosed in an embodiment of the present application.

Detailed Description

The terms "first," "second," and "third," etc. in the description and claims of the present application and the description of the drawings are used for distinguishing between different objects and not for limiting a particular order.

In the embodiments of the present application, the words "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "such as" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

For clarity and conciseness of the following descriptions of the various embodiments, a brief introduction to the related art is first given:

currently, a display screen is configured in various terminal devices, and the display screen includes various types, for example, the display screen includes a conventional liquid crystal display screen and an Organic Light Emitting Diode (OLED) display screen.

Among them, different kinds of display screens are affected by different reasons, and the displayed picture sometimes has a phenomenon of uneven brightness. For example, due to the influence of the inconsistent distribution of backlight light sources, the liquid crystal display usually has a phenomenon of uneven screen brightness; due to the influence of the drift of the semiconductor manufacturing process, the different characteristics of the light-emitting materials and the like, the phenomenon of uneven screen brightness sometimes occurs in the OLED display screen.

The uneven brightness of the screen refers to a phenomenon that when the powers of the driving currents input to the respective areas in the display screen are the same, the brightness of different areas in the screen of the display screen has a large difference. For example, some display screens have a higher brightness in the middle region and a lower brightness in the left and right end regions. Among them, an area in which brightness is not uniform in the display screen is generally called a mura area.

The existence of the mura area can affect the image display effect of the display screen and reduce the user experience, therefore, the mura area needs to be subjected to brightness compensation so as to eliminate the mura area in the display screen, and the technology for eliminating the mura area in the display screen can be generally called a demura technology.

Currently, the demura technique typically comprises the following steps: firstly, collecting a gray scale image of a display screen under a certain display brightness value DBV; then, determining a mapping relationship between the brightness and the gray scale in the gray scale image, for example, the mapping relationship between the brightness and the gray scale may be determined based on the factory specifications of the display screen, where the maximum brightness corresponding to the DBV generally corresponds to the maximum gray scale supported by the display screen, for example, the maximum brightness corresponding to the DBV of the display screen is 300nits, and when the maximum gray scale supported by the display screen is 255, the brightness corresponding to the gray scale 255 is 300nits in the mapping relationship; the terminal device selects several gray scales and the corresponding brightness of the gray scales in the mapping relationship according to the mapping relationship, and stores the selected several gray scales and the corresponding brightness as a brightness compensation table, for example, when the maximum brightness corresponding to the DBV of the display screen is 300nits, the brightness compensation table stored by the terminal device may include: 31nits corresponding to 32 gray scale, 75nits corresponding to 64 gray scale and 150nits corresponding to 192 gray scale; in the brightness compensation process, the gray scale of a pixel in a mura area of the display screen is determined, the brightness corresponding to the gray scale is determined according to a brightness compensation table, then the brightness of the pixel is adjusted to be the brightness corresponding to the gray scale determined according to the brightness compensation table, and the brightness compensation of the pixel is achieved, so that the mura area of the display screen is eliminated.

In addition, when the terminal device is in use, the DBV of the display screen may be adjusted sometimes, for example, when the display screen senses that light of a surrounding environment changes, or when an adjustment operation of the DBV by a user is received, the terminal device may adjust the DBV of the display screen accordingly.

The DBV is used for indicating the maximum brightness value which can be displayed by each pixel in the display screen, and the maximum brightness values which can be displayed by each pixel corresponding to different DBVs are different. Generally, the larger the DBV of a display screen, the higher the maximum luminance value that can be displayed by each pixel in the display screen.

In a feasible implementation manner, in order to facilitate the user to adjust the brightness of the display screen, a brightness progress bar may be displayed in the display interface of the display screen, and the user may drag the brightness progress bar, thereby implementing adjustment of the brightness progress bar. And adjusting the brightness progress bar to adjust the DBV of the display screen so as to realize the adjustment of the maximum brightness value displayed by each pixel in the display screen.

Illustratively, when the brightness progress bar is adjusted to be full, the maximum brightness corresponding to the DBV of the display screen is 300nits, and in this case, the maximum brightness value that each pixel in the display screen can display is 300nits; when the brightness progress bar is adjusted to be half-grid, the maximum brightness corresponding to the DBV of the display screen is 150nits, and in this case, the maximum brightness value that each pixel in the display screen can display is 150nits.

After adjusting the DBV of the display screen, it is often necessary to perform demura processing on the mura areas within the display screen again to eliminate the mura areas. At present, when demura processing is performed on a display screen after DBV adjustment, it is generally considered that the brightness of each pixel in the display screen presents a linear relationship before and after DBV adjustment, and demura processing is performed on a mura area after DBV adjustment based on the linear relationship.

Specifically, when performing demura processing on a display screen after adjusting a DBV, a ratio of maximum brightness corresponding to the DBV before and after adjustment is first determined, for example, if the maximum brightness corresponding to the DBV before adjustment is 300nits and the maximum brightness corresponding to the DBV after adjustment is 150nits, the ratio is 0.5; then, determining a gain coefficient based on the ratio, for example, the ratio of the maximum brightness corresponding to the DBV before and after adjustment may be used as the gain coefficient, or alternatively, a mapping relationship may be preset, where the mapping relationship includes a one-to-one correspondence relationship between different ratios and gain coefficients, and the gain coefficient is determined based on the mapping relationship and the ratio of the maximum brightness corresponding to the DBV before and after adjustment; a new brightness compensation table is determined by the brightness compensation table before the DBV adjustment and the gain coefficient, for example, the brightness corresponding to 64 gray scales is 75nits before the DBV adjustment, and the gain coefficient is determined to be 0.5 after the DBV adjustment, in which case the brightness corresponding to 64 gray scales is 37.5nits in the new brightness compensation table. Further, when the gray level of a certain pixel in the mura area is 64 gray levels, the brightness of the pixel is adjusted to 37.5nits during the demura process, so as to realize the brightness compensation for the pixel, and thus it is desirable to eliminate the mura area after the DBV adjustment.

However, the brightness change of each pixel in the display screen does not show a linear relationship before and after the DBV adjustment. For example, in the above example, after the DBV is adjusted, the ratio of the brightness of the same pixel before and after the DBV adjustment is not 0.5, and correspondingly, the brightness corresponding to the pixel of 64 grayscales is not 37.5nits. Therefore, after the display screen is subjected to demura processing by the scheme, the phenomenon of uneven brightness still exists in the display screen, namely, mura areas still exist in the display screen.

In order to solve the above problem, embodiments of the present application provide a method and an apparatus for adjusting brightness of a display screen.

Embodiments of the present application will be described below with reference to the accompanying drawings in order to clarify a method and an apparatus for adjusting brightness of a display screen provided by the present application.

In the embodiment of the application, a method for adjusting the brightness of a display screen is provided. Referring to the workflow diagram shown in fig. 1, the method for adjusting the brightness of the display screen includes the following steps:

and S11, determining a second corresponding relation between the brightness and the gray scale of each pixel in the non-mura area in the display screen after the display brightness value DBV is adjusted according to the first corresponding relation.

Wherein, the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted. If the mura area exists in the display screen before the DBV is adjusted, the first corresponding relationship may be a corresponding relationship between the brightness and the gray scale of each pixel of the non-mura area in the display screen before the DBV is adjusted.

In the first corresponding relationship, the maximum brightness corresponding to the DBV generally corresponds to the maximum gray scale supported by the display screen, that is, in the first corresponding relationship, when the gray scale of a certain pixel in the display screen is the maximum gray scale supported by the display screen, the brightness of the pixel is the maximum brightness corresponding to the DBV.

Illustratively, when the maximum gray scale supported by the display screen is 255 and the maximum brightness corresponding to the DBV of the display screen is 300nits, the brightness of a certain pixel in the display screen is 300nits when the gray scale of the pixel is 255. In addition, in this example, in the first corresponding relationship, the method may further include: 32 grayscales correspond to 31nits,64 grayscales correspond to 75nits, and 192 grayscales correspond to 150nits.

In the second corresponding relationship, the maximum brightness corresponding to the adjusted DBV generally corresponds to the maximum gray scale of the display screen. For example, when the maximum brightness corresponding to the adjusted DBV is 150nits and the maximum gray scale of the display screen is 255, after the DBV is adjusted, if the gray scale of a certain pixel in the display screen is 255, the brightness of the pixel is 150nits.

And S12, determining the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted according to the second corresponding relation.

Before and after the DBV adjustment, the correspondence between the brightness and the gray scale of each pixel in the display screen conforms to a second correspondence, and in this case, based on the second correspondence and the gray scale of each pixel in the mura area of the display screen, the target brightness corresponding to each pixel in the mura area of the display screen after the DBV adjustment can be determined.

And S13, adjusting the brightness of each pixel in the mura area to be the target brightness corresponding to each pixel.

In the above steps, the brightness of each pixel is adjusted to the target brightness, so that the brightness compensation of the pixels in the mura area is realized, and the demura processing of the display screen is completed.

In the method for adjusting the brightness of the display screen disclosed in the embodiment of the application, according to a first corresponding relationship between each brightness and a gray scale of the display screen before the DBV is adjusted, a second corresponding relationship between the brightness and the gray scale in a non-mura area of the display screen after the DBV is adjusted is determined, according to the second corresponding relationship, a target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted is determined, and the brightness of each pixel in the mura area is adjusted to be the target brightness.

In the prior art, it is considered that the brightness of each pixel in the display screen shows a linear relationship before and after the DBV adjustment based on this idea, the prior art determines the gain coefficient by the ratio of the maximum brightness corresponding to the DBV before and after the adjustment, and determines the brightness after the DBV adjustment by the product of the gain coefficient and the brightness corresponding to each pixel before the DBV adjustment. However, before and after the DBV adjustment, the brightness change of each pixel in the display screen does not show a linear relationship, and therefore, after the demura processing is performed by the prior art, the brightness in the display screen often still has a phenomenon of uneven brightness, that is, the display screen still includes a mura area.

In the scheme of the embodiment of the application, a first corresponding relation between the brightness and the gray scale of each pixel before DBV adjustment is utilized to determine a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in a display screen after the DBV adjustment, and then the second corresponding relation is utilized to perform brightness compensation on the pixels in the mura area, namely, the target brightness of the pixels in the mura area needing to be adjusted is determined through the second corresponding relation.

After the DBV is adjusted, the corresponding relation between the gray scale and the brightness of each pixel in the display screen is more consistent with the human eye characteristics when the corresponding relation accords with the second corresponding relation, so that the effect of demura on the mura area of the display screen after the DBV is adjusted is better based on the second corresponding relation. Therefore, compared with the scheme in the prior art, the scheme in the embodiment of the application can improve the accuracy of demura processing and reduce the compensation error of brightness compensation of the pixels in the mura area.

In this embodiment of the application, the first corresponding relationship is specifically used to indicate a corresponding relationship between the brightness of each pixel in the display screen, the DBV before adjustment, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen, and the first gamma value before DBV adjustment.

In addition, the second corresponding relationship is specifically used to indicate a corresponding relationship between the brightness of each pixel in the display screen, the adjusted DBV, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen, and the second gamma value after the DBV is adjusted.

In this case, the step S11 of determining a second corresponding relationship between the brightness and the gray scale of each pixel in the non-mura area of the display screen after the display brightness value DBV is adjusted according to the first corresponding relationship includes the following steps:

firstly, according to a first gamma value in the first corresponding relation, determining a second gamma value in the second corresponding relation, wherein the difference value of the first gamma value and the second gamma value is in a preset range;

and then, determining the second corresponding relation according to the second gamma value and the adjusted DBV.

Before and after the DBV is adjusted, corresponding gamma values are similar for the same display screen, namely, the difference values of the first gamma value and the second gamma value respectively corresponding to the front and the back of the DBV are in a preset range.

The preset range may reflect a similarity between the first gamma value and the second gamma value. In this embodiment of the application, the preset range may be set according to a requirement on precision of demura processing, and when the requirement on precision of demura processing is high, a degree of similarity between the first gamma value and the second gamma value is required to be high, and an absolute value of each value in the preset range is usually a small value; when the requirement on the accuracy of the demura processing is low, the similarity between the first gamma value and the second gamma value may be low, and the absolute value of each value in the preset range may be a large value.

In particular, when the requirement on the accuracy of the demura processing is high, the preset range is zero, that is, the first gamma value is the same as the second gamma value.

In a possible implementation manner, the first corresponding relationship is: (brightness of pixel/maximum brightness corresponding to DBV before adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g1 。

Correspondingly, the second corresponding relationship is as follows: (brightness of pixel/maximum brightness corresponding to DBV after adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g2 ；

Wherein g1 is the first gamma value and g2 is the second gamma value.

The maximum brightness corresponding to the DBV before adjustment refers to the maximum brightness that can be achieved by each pixel in the display screen before the DBV is adjusted. The maximum brightness corresponding to the adjusted DBV refers to the maximum brightness that can be achieved by each pixel in the display screen after the DBV is adjusted.

Correspondingly, the brightness of the pixel can be determined according to the second corresponding relation, the gray scale of the pixel, the maximum gray scale of the display screen, the second gamma value and the maximum brightness corresponding to the adjusted DBV.

To clarify the advantages of the solution provided by the present application, the present application also provides the following examples:

in an example, before adjusting the DBV, the maximum brightness of the DBV is 300nits, the maximum gray level of the display screen is 255, and the relationship curve of the first corresponding relationship is determined as shown in fig. 2. In the coordinate system shown in fig. 2, the horizontal axis represents the gray scale of a pixel, and the vertical axis represents the luminance of a pixel. Referring to FIG. 2, it can be seen that before adjusting the DBV, when the gray level of a certain pixel is 32, the brightness of the pixel is 31nits; when the gray scale of a certain pixel is 64, the brightness of the pixel is 75nits; when the gray scale of a certain pixel is 192, the brightness of the pixel is 150nits; when the gray scale of a certain pixel is 255, the brightness of the pixel is 300nits. That is, if the gray scale of a pixel in the mura area of the display screen is 64, the brightness of the pixel can be adjusted to 75nits when the brightness of the pixel is compensated.

In addition, in this example, the maximum luminance corresponding to the adjusted DBV is 150nits.

When the prior art carries out demura processing on a display screen, firstly, the ratio of the maximum brightness corresponding to the DBV after adjustment to the maximum brightness corresponding to the DBV before adjustment is determined, namely 150/300=0.5, and accordingly, the gain coefficient can be determined to be 0.5; then, the brightness of the pixel of 64 gray levels is determined as the product of 0.5 and 75nits, i.e. 37.5nits, and then the brightness of the pixel is adjusted to 37.5nits. That is, in the prior art, the 64-gray level pixel is adjusted to 37.5nits.

When the scheme provided by the embodiment of the application is applied, a second corresponding relationship is determined according to the first corresponding relationship, and a difference value between a second gamma value in the second corresponding relationship and a first gamma value in the first corresponding relationship is within a preset range. In this case, in the present example, the relationship curve of the determined second correspondence is as shown in fig. 3. In the coordinate system shown in fig. 3, the horizontal axis represents the gray scale of a pixel, and the vertical axis represents the luminance of a pixel.

Referring to fig. 3, in the second corresponding relationship, the brightness corresponding to 32 gray scales is 1696s, the brightness corresponding to 61 gray scales is 31nits, the brightness corresponding to 64 gray scales is 33nits, the brightness corresponding to 180 gray scales is 75nits, the brightness corresponding to 192 gray scales is 100nits, and the brightness corresponding to 255 gray scales is 150nits.

That is, after the maximum brightness corresponding to the DBV of the display screen is adjusted from 300nits to 150nits, the brightness corresponding to the 32 gray scale is changed from 31nits to 1696s, the brightness corresponding to the 64 gray scale is changed from 75nits to 33nits, the brightness corresponding to the 192 gray scale is changed from 150nits to 100nits, and the brightness corresponding to the 255 gray scale is changed from 300nits to 150nits.

According to the second corresponding relationship of FIG. 3, when the gray level of a pixel in the mura area is 64, the brightness corresponding to the pixel is determined to be 33nits, and during the demura processing, the brightness of the pixel is adjusted to be 33nits. That is, the pixels with 64 gray levels are adjusted to 33nits by the scheme provided by the embodiment of the application.

Compared with the prior art, the brightness of the pixel with the same gray scale determined by the two schemes is different, and the brightness of the pixel determined by the scheme provided by the embodiment of the present application is closer to the brightness required to be presented by the pixel, wherein the brightness required to be presented by the pixel refers to the brightness theoretically presented by the pixel if the mura phenomenon does not exist. Therefore, the accuracy of demura processing can be improved and the compensation error of brightness compensation of the pixels in the mura area can be reduced through the scheme provided by the embodiment of the application.

In the embodiment of the present application, the method includes an operation of determining, according to the second correspondence, respective target luminances corresponding to respective pixels in a mura area of the display screen after the DBV is adjusted. This operation can be achieved in a number of ways, among others.

In a possible implementation manner, the determining, according to the second corresponding relationship, target luminances corresponding to respective pixels in a mura area of the display screen after the DBV is adjusted includes:

and determining the brightness of each pixel in the mura area corresponding to the gray scale of each pixel in the second corresponding relation, wherein the brightness of each pixel corresponding to the gray scale of each pixel in the second corresponding relation is the target brightness of each pixel.

In the embodiment of the present application, after the second corresponding relationship is determined, each gray level in the second corresponding relationship and the brightness corresponding to the gray level may be stored. In this case, during the demura processing, the gray scale of the pixel in the mura area of the display screen may be determined, and then the luminance corresponding to the gray scale in the second correspondence may be determined, which is the target luminance of the pixel.

Each gray scale in the second corresponding relation and the brightness corresponding to the gray scale can be stored by storing the expression of the second corresponding relation. Exemplarily, when the second corresponding relationship is: (brightness of pixel/maximum brightness corresponding to DBV after adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g2 This relationship may be stored.

In this case, when determining the gray scale of a certain pixel in the mura area of the display screen after the DBV adjustment, the brightness of the pixel in the relational expression may be calculated according to the stored relational expression of the second correspondence, where the brightness is the target brightness corresponding to the pixel.

Through the steps, after the DBV is adjusted, the display chip can calculate the target brightness of the target pixel in real time according to the pre-stored relational expression, the gray-scale value of the target pixel and the maximum brightness corresponding to the adjusted DBV, and carry out brightness compensation on the pixel according to the target brightness, so that demura processing is realized. Illustratively, the pre-stored relationship is as follows:

(luminance of pixel/maximum luminance corresponding to DBV) = (gray scale of pixel/maximum gray scale of display screen) ^g

In the embodiment of the application, the display chip stores a corresponding relation among the DBV, the pixel gray scale and the pixel brightness in advance, after the DBV is adjusted, the display chip obtains the maximum brightness corresponding to the adjusted DBV and the gray scale value corresponding to the target pixel to be compensated, so that the brightness corresponding to the pixel to be compensated can be calculated in real time based on the pre-stored relation, and the brightness is used as the brightness value after compensation.

Furthermore, the method calculates the target brightness corresponding to the pixel in real time according to the relational expression of the second corresponding relation, so that the accuracy of determining the target brightness is higher.

In another possible implementation manner, the second corresponding relationship includes n gray scales and n luminances corresponding to the n gray scales, where n is a positive integer.

In this case, n gray scales and n luminances corresponding to the n gray scales in the second correspondence may be obtained through the second correspondence, and the correspondence between the n gray scales and the n luminances may be stored. In this embodiment, the target luminance of the pixel is determined according to the n luminances corresponding to the n gray scales and the n gray scales, respectively.

In one possible design, n may be determined to be 3, that is, 3 luminances corresponding to 3 gray levels in the second correspondence relationship are determined.

Of course, n can also be other positive integers. Generally, when the requirement on the accuracy of the demura processing is high, n is set to be a large value, and when the requirement on the accuracy of the demura processing is not high, n is set to be a small value.

Correspondingly, the determining, according to the second corresponding relationship, the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted includes the following steps:

when the first gray scale of the first pixel in the mura area belongs to the n gray scales, determining that the corresponding brightness of the first gray scale in the second corresponding relation is the target brightness of the first pixel, and the first pixel is any one pixel in the mura area.

In one example, after the DBV of the display screen is adjusted, the corresponding brightness is 150nits, and a relationship curve of the second correspondence is as shown in fig. 3, n is 3, the determined 3 gray scales are 32 gray scale, 64 gray scale and 192 gray scale, respectively, and the brightness of the 32 gray scale in the second correspondence is 1696s, the brightness of the 64 gray scale in the second correspondence is 33nits, and the brightness of the 192 gray scale in the second correspondence is 100nits.

In this case, when the first gray scale of the first pixel is 64 gray scales, it is determined that the target brightness of the first pixel is 33nits.

When the first gray scale of the first pixel in the mura area does not belong to the n gray scales, performing interpolation processing on the n gray scales and n luminances corresponding to the n gray scales respectively to determine a first luminance corresponding to the first gray scale, wherein the first luminance is a target luminance of the first pixel.

When performing interpolation processing on the n gray scales and the n luminances corresponding to the n gray scales, interpolation processing is usually performed on the adjacent gray scale of the first gray scale and the luminance corresponding to the adjacent gray scale among the n gray scales.

Illustratively, the maximum brightness corresponding to the DBV of the display screen before the DBV is adjusted is 300nits, and in this example, the maximum brightness corresponding to the DBV after the DBV is adjusted is 150nits, the relationship curve of the second correspondence is as shown in fig. 3, n is 3, the 3 gray levels stored in the second correspondence are 32, 64 and 192, respectively, and the first gray level is 50. That is, the first gray scale does not belong to the 3 gray scales stored in the second correspondence.

In this case, the adjacent gray levels of the first gray level are 32 gray levels and 64 gray levels, and in the embodiment of the present application, the brightness corresponding to the 32 gray levels and the brightness corresponding to the 64 gray levels and the 64 gray levels may be interpolated, and the brightness corresponding to the 50 gray levels may be determined through the interpolation.

In addition, the brightness of the pixels with the gray scale of 0 in the display screen is 0nits before and after the DBV adjustment. When the first gray scale of the first pixel in the mura area does not belong to the n gray scales and is smaller than the minimum gray scale of the n gray scales, the adjacent gray scale of the first gray scale is the 0 gray scale and the minimum gray scale of the n gray scales, and the brightness corresponding to the first gray scale can be determined by means of interpolation processing of the 0 gray scale and the minimum gray scale of the n gray scales.

In this case, in the above example, if the first gradation is 15 gradations, the first gradation is smaller than the minimum gradation among the 3 gradations, the adjacent gradations of the first gradation are 0 and 32, and by interpolating 0 and 32, the luminance corresponding to when the gradation of the pixel is 15 is calculated.

In addition, in the embodiment of the present application, when performing interpolation processing on the n gray scales and the n luminances corresponding to the n gray scales, various types of interpolation processing methods may be adopted, which is not limited in the embodiment of the present application. For example, the interpolation method adopted in the embodiment of the present application may be a linear interpolation method.

Through the steps, the terminal equipment can determine the target brightness corresponding to the pixels in the mura area of the display screen after the DBV is adjusted, so that demura processing can be realized according to the target brightness.

Furthermore, in the scheme for determining the target brightness, the terminal device only needs to store n gray scales, and the n gray scales correspond to the n brightness in the second corresponding relationship, so that the mode occupies a small storage space.

In this embodiment, when the first gray scale belongs to the n gray scales, the target brightness of the first pixel can be determined according to the stored correspondence between the n gray scales and the n brightnesses; when the first gray scale does not belong to the n gray scales, interpolation processing is carried out according to the n gray scales and the brightness corresponding to the n gray scales respectively, so that the target brightness of the first pixel can be determined, and real-time calculation is not needed through a relation between the gray scales and the brightness, so that the calculation amount is small, and correspondingly, the efficiency of determining the target brightness of the first pixel is improved.

Or, in another possible implementation manner, referring to the workflow diagram shown in fig. 4, the determining, according to the second correspondence, target luminances corresponding to respective pixels in a mura area of the display screen after the DBV is adjusted includes the following steps:

and S21, determining second brightness corresponding to the second gray scale of the second pixel in the mura area in the second corresponding relation, and determining a third gray scale corresponding to the second brightness in the first corresponding relation. Wherein the second pixel may be any one pixel in the mura area.

In the scheme provided by the embodiment of the application, the target brightness is determined according to the corresponding gray scales of the same brightness before and after the DBV adjustment. In this case, through step S21, a second gray scale corresponding to the second luminance in the second correspondence relationship and a third gray scale corresponding to the second luminance in the first correspondence relationship may be determined.

Illustratively, the maximum brightness corresponding to the DBV of the display screen before the DBV is adjusted is 300nits, and in this example, the maximum brightness corresponding to the DBV of the display screen after the DBV is adjusted is 150nits, the relationship curve of the second relationship is as shown in fig. 3, and in this example, the second gray scale of the second pixel is 61. In this case, based on the first correspondence relationship shown in fig. 3, the second luminance corresponding to the second gray scale may be determined to be 31nits, and then, according to the first correspondence relationship shown in fig. 2, the third gray scale corresponding to the second luminance in the first correspondence relationship may be determined to be 32. That is, the second luminance is 31nits, which corresponds to the second gray scale of 61 in the second correspondence relationship, and the third gray scale of 32 in the first correspondence relationship.

Step S22, determining a first gain value according to the second gray scale and the third gray scale, wherein the product of the first gain value and the third gray scale is a first target gray scale.

Wherein the first gain value may be obtained in a plurality of ways.

In one of the methods for obtaining the first gain value, the first gain value may be a ratio of the third gray scale to the second gray scale, that is, the ratio of the third gray scale to the second gray scale is determined as the first gain value. In this case, in the above example, the first gain value is 32/61.

Or, in another method for obtaining the first gain value, first determining a ratio of the third gray scale to the second gray scale; then, in a preset first mapping relationship, determining a gain value corresponding to a ratio of the third gray scale to the second gray scale as the first gain value, where the preset first mapping relationship is a mapping relationship between different ratios and corresponding gain values. That is to say, the first gain value is a gain value corresponding to a ratio of the third gray scale to the second gray scale in a predetermined first mapping relationship.

Of course, the first gain value may also be determined in other manners, which is not limited in this application.

In addition, in the embodiment of the present application, the product of the first gain value and the third gray scale is a first target gray scale, for example, in the above example, if the second brightness is 31nits, the corresponding second gray scale of the second brightness in the second corresponding relationship is 61, the corresponding third gray scale in the first corresponding relationship is 32, and the first gain value is 32/61, the first target gray scale is 32/61.

Step S23, determining a third luminance corresponding to the first target gray scale in the first corresponding relationship, and determining the third luminance as the target luminance of the second pixel.

Through the steps, the terminal equipment can determine the target brightness corresponding to the gray scale of the pixel in the mura area of the display screen after the DBV is adjusted, and accordingly demura processing can be achieved according to the target brightness.

In addition, when determining the third luminance corresponding to the first target gray scale in the first corresponding relationship, the third luminance may be implemented in various ways.

In one of the ways, the first correspondence may be stored. Wherein the first corresponding relation can be represented by a relational expression, in which case the relational expression of the first corresponding relation can be stored. Exemplarily, when the first correspondence is: (brightness of pixel/maximum brightness corresponding to DBV before adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g1 This relationship may then be stored.

In this case, after the first target gradation is determined, the third luminance may be calculated from the stored first correspondence.

In this way, the third brightness can be calculated, so that demura processing can be performed through the third brightness to eliminate a mura area in the display screen. In this way, the third brightness is calculated and determined in real time through the first corresponding relation, and the accuracy of the determined third brightness is high.

Alternatively, in another possible implementation manner, the first correspondence relationship includes m gray scales and m luminances corresponding to the m gray scales, where m is a positive integer.

In this case, the correspondence between the m gray scales and the m luminances may be stored. In this embodiment, the target brightness of the pixel is determined according to the m grayscales and m brightnesses corresponding to the m grayscales.

In a possible design, m may be determined to be 3, that is, 3 luminances corresponding to 3 gray levels in the first correspondence are determined.

Of course, m can also be other positive integers. Generally, m is set to a larger value when the requirement on the accuracy of demura processing is high, and is set to a smaller value when the requirement on the accuracy of demura processing is not high.

Correspondingly, the determining the third brightness corresponding to the first target gray scale in the first corresponding relationship includes:

and when the first target gray scale belongs to the m gray scales, the third brightness is the brightness corresponding to the first target gray scale in the first corresponding relation.

In one example, the maximum brightness corresponding to the DBV before adjustment is 300nits, and in this example, the DBV of the display screen is adjusted to 150nits, the relationship curve corresponding to the first correspondence is shown in fig. 2, and the relationship curve corresponding to the second correspondence is shown in fig. 3. In this example, the m gray levels are 32, 64, and 192, respectively, where 32 gray level corresponds to 31nits in the first correspondence, 64 gray level corresponds to 75nits in the first correspondence, and 192 gray level corresponds to 150nits in the first correspondence.

In this case, when the first target gray scale is one of the gray scales 32, 64, and 192, it may be determined that the third brightness corresponding to the first target gray scale before the DBV adjustment is the brightness corresponding to the gray scale. For example, when the first target gray level is 32, it may be determined that the third brightness is 31nits.

In addition, when the first target gray scale does not belong to the m gray scales, the third brightness is determined by performing interpolation processing on m brightnesses respectively corresponding to the m gray scales and the m gray scales.

When performing interpolation processing on the m gray scales and the luminances corresponding to the m gray scales, interpolation processing is usually performed on the adjacent gray scale of the first target gray scale and the luminances corresponding to the adjacent gray scale in the first corresponding relationship among the m gray scales.

Illustratively, the m grayscales are 32, 64, and 192, respectively, and the first target grayscale is 50, the neighboring grayscales of the first target grayscale are 32 and 64. In the embodiment of the present application, the luminance corresponding to the first correspondence relationship may be determined 50 by performing interpolation processing on the luminances corresponding to the 32 and 32 in the first correspondence relationship, and the luminances corresponding to the 64 and 64 in the first correspondence relationship, and by the interpolation processing.

In addition, the brightness of the pixels with the gray scale of 0 in the display screen is 0nits before and after the DBV adjustment. When the first target gray scale does not belong to the m gray scales and is smaller than the minimum gray scale in the m gray scales, the adjacent gray scale of the first target gray scale is the 0 gray scale and the minimum gray scale in the m gray scales, and the brightness corresponding to the first target gray scale can be determined by means of interpolation processing of the brightness (namely 0 nits) corresponding to the 0 gray scale in the first corresponding relation and the brightness corresponding to the minimum gray scale in the m gray scales in the first corresponding relation.

In this case, in the above example, if the first target gray scale is 20, the first target gray scale is smaller than the minimum gray scale of the 3 gray scales, and the adjacent gray scales of the first target gray scale are 0 and 32. By interpolation processing of the luminances corresponding to 0 and 32, and 0 and 32 in the first correspondence, respectively, a third luminance corresponding to the first correspondence when the gray scale is 20 is determined.

In addition, in the embodiment of the present application, when performing interpolation processing on the m gray scales and the m luminances corresponding to the m gray scales, various types of interpolation processing methods may be adopted, which is not limited in the embodiment of the present application. For example, the interpolation method adopted in the embodiment of the present application may be a linear interpolation method.

Furthermore, in the scheme for determining the target brightness, the terminal device only needs to store m gray scales and m brightnesses respectively corresponding to the m gray scales in the first corresponding relationship, so that the mode occupies a small storage space.

In this embodiment, when the first target gray scale belongs to the m gray scales, the target brightness of the second pixel can be determined according to the stored correspondence between the m gray scales and the m brightness; when the first target gray scale does not belong to the m gray scales, interpolation processing is carried out according to the m gray scales and the brightness corresponding to the m gray scales respectively, the target brightness of the second pixel can be determined, real-time calculation is not needed through a relation between the gray scales and the brightness, therefore, the calculation amount is small, and correspondingly, the efficiency of determining the target brightness of the second pixel is improved.

Or, in another possible implementation manner, referring to a workflow diagram shown in fig. 5, the determining, according to the second correspondence, target luminances corresponding to respective pixels in a mura area of the display screen after the DBV is adjusted includes the following steps:

and S31, determining a second gain value according to the maximum brightness corresponding to the DBV before adjustment and the maximum brightness corresponding to the DBV after adjustment.

Wherein the second gain value may be determined in a variety of ways. In one mode, the determining a second gain value according to the maximum brightness corresponding to the DBV before the adjustment and the maximum brightness corresponding to the DBV after the adjustment includes: and determining the ratio of the maximum brightness corresponding to the DBV after the adjustment to the maximum brightness corresponding to the DBV before the adjustment as the second gain value.

Or, the determining a second gain value according to the maximum brightness corresponding to the DBV before the adjustment and the maximum brightness corresponding to the DBV after the adjustment includes: and in a preset second mapping relationship, determining a gain value corresponding to a ratio of the maximum brightness corresponding to the adjusted DBV to the maximum brightness corresponding to the pre-adjusted DBV as the second gain value, where the preset second mapping relationship is a mapping relationship between different ratios and corresponding gain values.

That is, in this scheme, a second mapping relationship is set in advance, and then, the gain value corresponding to the ratio in the second mapping relationship is determined as the second gain value.

Of course, the second gain value may also be determined in other ways, which is not limited in this embodiment of the present application.

And S32, determining a third gain value according to the maximum brightness corresponding to the adjusted DBV and the second gain value.

In the embodiment of the application, a third gain value is obtained by adjusting the second gain value, so that the third gain value can better reflect the change condition of the brightness corresponding to each gray scale before and after the DBV adjustment.

In one possible implementation manner, the determining a third gain value according to the adjusted DBV and the second gain value includes:

determining a third gain value by:

Gain1＝((MaxDBV-MinDBV)/(CurrentDBV-MinDBV))*EndPointGain；

and the EndPointGain is the second gain value, minDBV is the maximum brightness corresponding to the minimum DBV of the display screen, maxDBV is the maximum brightness corresponding to the maximum DBV of the display screen, and CurrentDBV is the adjusted DBV.

In the above formula, minDBV is the maximum brightness corresponding to the minimum DBV of the display screen, wherein the maximum brightness corresponding to MinDBV is usually 0nits; in addition, in the example corresponding to fig. 2 and fig. 3, the maximum brightness corresponding to the maximum DBV of the display screen is usually 300nits, and then in this example, the maximum brightness corresponding to MaxDBV is 300nits; when the maximum brightness corresponding to the DBV of the display screen is adjusted to 150nits, the maximum brightness corresponding to the CurrentDBV is 150nits. In this case, if EndPointGain is 1, gain1 is 2.

Of course, the third gain value may also be obtained in other ways, which is not limited in this embodiment of the present application.

And step S33, determining the product of the gray scale of the third pixel in the mura area and the third gain value as a second target gray scale.

Wherein the third pixel is any one pixel in the mura area.

In this embodiment, the product of the gray scale of the third pixel and the third gain value is a second target gray scale, for example, if the gray scale of the third pixel is 32 and the third gain value is 2, the second target gray scale is 64.

And S34, determining the corresponding fourth brightness of the second target gray scale in the first corresponding relation.

And step S35, determining the fourth brightness as the target brightness of the third pixel.

Through the steps, the terminal equipment can determine the target brightness corresponding to the gray scale of the pixels in the mura area of the display screen after the DBV is adjusted.

In the embodiment of the present application, a fourth luminance corresponding to the second target gray scale before the DBV adjustment is taken as the target luminance. In this case, the terminal device may store the first corresponding relationship, and after the second target gray scale is determined, the brightness of the second target gray scale corresponding to the first corresponding relationship is the fourth brightness, that is, the fourth brightness may be determined according to the first corresponding relationship stored in the terminal device.

In a possible design, the terminal device may implement the second mapping by storing the relation of the first mappingAnd storing a corresponding relation. Exemplarily, when the first correspondence is: (brightness of pixel/maximum brightness corresponding to DBV before adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g1 The terminal device may then store the relational expression. In this case, the fourth luminance can be calculated by the relational expression.

In this way, the fourth brightness can be calculated, so that demura processing can be performed through the fourth brightness, and a mura area in the display screen is eliminated. In this way, the fourth brightness is calculated and determined in real time through the first corresponding relation, and the accuracy of the determined fourth brightness is high.

Or, in another possible implementation manner, the first corresponding relationship includes r gray scales and r luminances corresponding to the r gray scales, where r is a positive integer.

In this case, the correspondence between the r gray scales and the r luminances can be stored. In this embodiment, the target brightness of the pixel is determined according to the r gray levels and r brightnesses corresponding to the r gray levels.

In a possible design, r may be determined to be 3, that is, 3 luminances corresponding to 3 gray levels in the first correspondence are determined.

Of course, r can also be other positive integers. Generally, r is set to a larger value when the requirement on the accuracy of demura processing is high, and is set to a smaller value when the requirement on the accuracy of demura processing is not high.

Correspondingly, the determining the corresponding fourth brightness of the second target gray scale in the first corresponding relationship includes:

when the second target gray scale belongs to the r gray scales, the fourth brightness is the brightness corresponding to the second target gray scale in the first corresponding relationship;

when the second target gray scale does not belong to the r gray scales, the fourth luminance is a luminance determined by performing interpolation processing on the r gray scales and r luminances corresponding to the r gray scales.

When the r gray scales and the luminances corresponding to the r gray scales are interpolated, the adjacent gray scale of the second target gray scale and the luminances corresponding to the adjacent gray scale in the first corresponding relationship among the r gray scales are usually interpolated.

When the second target gray scale is smaller than the minimum gray scale of the r gray scales, the adjacent gray scale of the second target gray scale is the 0 gray scale and the minimum gray scale of the r gray scales, and the fourth brightness can be determined by means of interpolation processing of the brightness corresponding to the 0 gray scale in the first corresponding relationship and the brightness corresponding to the minimum gray scale of the r gray scales in the first corresponding relationship.

In addition, in the embodiment of the present application, when performing interpolation processing on the r gray scales and the r luminances corresponding to the r gray scales, various types of interpolation processing methods may be adopted, which is not limited in the embodiment of the present application. For example, the interpolation method adopted in the embodiment of the present application may be a linear interpolation method.

Through the steps, the terminal equipment can determine the target brightness corresponding to the pixels in the mura area of the display screen after the DBV is adjusted, and accordingly demura processing can be achieved according to the target brightness.

Furthermore, in the scheme for determining the target brightness, the terminal device only needs to store r gray scales, and the r gray scales respectively correspond to the r brightness in the first corresponding relationship, so that the storage space occupied by the method is small.

In addition, in the scheme, real-time calculation is not needed through a relational expression between the brightness and the gray scale, the calculation amount is small, and accordingly, the efficiency of determining the target brightness of the third pixel is improved.

Further, when the second target gray scale is larger than the gray scale of the display screen, the determining a fourth brightness corresponding to the second target gray scale in the first corresponding relationship includes:

The maximum gray scale supported by the display screen is often set by default when the display screen leaves a factory, and when the second target gray scale is greater than the maximum gray scale supported by the display screen, the brightness corresponding to the second target gray scale does not exist in the first corresponding relationship.

Illustratively, the maximum gray scale of the display screen is 255, the third gain value is 2, and the gray scale of the third pixel is 192, in which case, the second target gray scale is 384, which exceeds the maximum gray scale of the display screen, in which case, the fourth brightness may be determined as the maximum brightness that the display screen can display after the DBV adjustment. If the maximum brightness that the display screen can display after the DBV adjustment is 150nits, the fourth brightness is 150nits.

The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.

Corresponding to the method embodiment, the embodiment of the application discloses a display screen brightness adjusting device. Referring to the schematic structural diagram shown in fig. 6, the display screen brightness adjusting apparatus includes a processing unit 110 and a brightness adjusting unit 120.

The processing unit 110 is configured to determine, according to a first corresponding relationship, a second corresponding relationship between the brightness and the gray scale of each pixel in a non-mura area in the display screen after the display brightness value DBV is adjusted, where the first corresponding relationship is a corresponding relationship between the brightness and the gray scale of each pixel in the display screen before the DBV is adjusted;

the processing unit 110 is further configured to determine, according to the second correspondence, target brightness corresponding to each pixel in a mura area of the display screen after the DBV is adjusted;

the brightness adjusting unit 120 is configured to adjust the brightness of each pixel in the mura area to a target brightness corresponding to each pixel.

By the device disclosed by the embodiment of the application, the first corresponding relation between the brightness and the gray scale of each pixel before DBV adjustment can be utilized to determine the second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in a display screen after the DBV is adjusted, and then the second corresponding relation is utilized to perform brightness compensation on the pixels in the mura area, namely the target brightness of the pixels in the mura area needing to be adjusted is determined through the second corresponding relation.

After the DBV is adjusted, the corresponding relation between the gray scale and the brightness of each pixel in the display screen is more consistent with the second corresponding relation. Therefore, compared with the scheme in the prior art, the scheme in the embodiment of the application can improve the accuracy of demura processing and reduce the compensation error of brightness compensation of the pixels in the mura area.

In addition, after demura processing is performed on the display screen after DBV adjustment by the conventional technique, the display screen may still have uneven brightness, and thus it is difficult to check and accept the display screen with image quality (PQ). The PQ acceptance means that whether the display quality of the display screen meets the standard or not is determined by the display effect of the display screen observed by naked eyes.

In the apparatus disclosed in the embodiment of the present application, the first corresponding relationship is specifically used to indicate a corresponding relationship between the brightness of each pixel in the display screen, the DBV before adjustment, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen, and the first gamma value before DBV adjustment;

the second correspondence is specifically used for indicating a correspondence between the brightness of each pixel in the display screen, the adjusted DBV, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen, and the second gamma value after the DBV is adjusted.

Further, in the apparatus disclosed in the embodiment of the present application, the processing unit is specifically configured to: determining a second gamma value in the second corresponding relation according to a first gamma value in the first corresponding relation, wherein the difference value of the first gamma value and the second gamma value is within a preset range;

Wherein, in a possible scheme, the first corresponding relationship is: (brightness of pixel/maximum brightness corresponding to DBV before adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g1 ；

The second corresponding relation is as follows: (brightness of pixel/maximum brightness corresponding to DBV after adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g2 ；

Wherein g1 is the first gamma value and g2 is the second gamma value.

In this embodiment, the method includes an operation of determining, according to the second correspondence, target brightness corresponding to each pixel in a mura area of the display screen after the DBV is adjusted. This operation can be achieved in a number of ways, among others.

In a possible implementation manner, the processing unit is specifically configured to determine respective corresponding luminances of the gray scales of the pixels in the mura area in the second corresponding relationship, where the respective corresponding luminances of the gray scales of the pixels in the second corresponding relationship are target luminances corresponding to the pixels, respectively.

In this case, the processing unit is specifically configured to, when a first gray scale of a first pixel in the mura area belongs to the n gray scales, determine that a luminance corresponding to the first gray scale in the second correspondence relationship is a target luminance of the first pixel, where the first pixel is any one pixel in the mura area;

Alternatively, in another possible implementation manner, the processing unit is specifically configured to: determining a second brightness corresponding to a second gray scale of a second pixel in the mura area in the second corresponding relation, wherein the second pixel is any one pixel in the mura area;

determining a third gray scale corresponding to the second brightness in the first corresponding relation;

determining a first gain value according to the second gray scale and the third gray scale, wherein the product of the first gain value and the third gray scale is a first target gray scale;

determining third brightness corresponding to the first target gray scale in the first corresponding relation;

determining the third brightness as a target brightness of the second pixel.

In this case, the first corresponding relationship includes m gray scales and m luminances corresponding to the m gray scales, where m is a positive integer;

the processing unit is specifically configured to: when the first target gray scale belongs to the m gray scales, determining the third brightness as the brightness corresponding to the first target gray scale in the first corresponding relation;

when the first target gray scale does not belong to the m gray scales, determining the third brightness as the brightness determined after interpolation processing is performed on the m gray scales and m brightness corresponding to the m gray scales respectively.

In addition, in this implementation, the processing unit is specifically configured to: determining the ratio of the third gray scale to the second gray scale as the first gain value;

or, the processing unit is specifically configured to determine a ratio of the third gray scale to the second gray scale;

and determining a gain value corresponding to the ratio of the third gray scale to the second gray scale as the first gain value in a preset first mapping relation, wherein the preset first mapping relation is a mapping relation between different ratios and corresponding gain values.

Alternatively, in another possible implementation manner, the processing unit is specifically configured to: determining a second gain value according to the maximum brightness corresponding to the DBV before adjustment and the maximum brightness corresponding to the DBV after adjustment;

determining a third gain value according to the maximum brightness corresponding to the adjusted DBV and the second gain value;

determining a product of a gray scale of a third pixel in the mura area and the third gain value as a second target gray scale, wherein the third pixel is any one pixel in the mura area;

determining a fourth brightness corresponding to the second target gray scale in the first corresponding relation;

determining the fourth brightness as a target brightness of the third pixel.

Wherein the first corresponding relationship comprises r gray scales and r brightnesses respectively corresponding to the r gray scales, and r is a positive integer;

the processing unit is specifically configured to: when the second target gray scale belongs to the r gray scales, determining the fourth brightness as the brightness corresponding to the second target gray scale in the first corresponding relation;

and when the second target gray scale does not belong to the r gray scales, determining the fourth brightness as the brightness determined by performing interpolation processing on the r gray scales and r brightnesses respectively corresponding to the r gray scales.

When the second target gray scale is larger than the gray scale of the display screen, the processing unit is specifically configured to determine that the maximum brightness that can be displayed by the display screen after the DBV adjustment is the fourth brightness.

In this manner, the processing unit is specifically configured to: determining the ratio of the maximum brightness corresponding to the DBV after adjustment to the maximum brightness corresponding to the DBV before adjustment as the second gain value;

or, the processing unit is specifically configured to determine, in a preset second mapping relationship, that a gain value corresponding to a ratio of a maximum brightness corresponding to the adjusted DBV to a maximum brightness corresponding to the pre-adjusted DBV is the second gain value, where the preset second mapping relationship is a mapping relationship between different ratios and corresponding gain values.

Further, in the solution disclosed in the embodiment of the present application, the processing unit is specifically configured to determine the third gain value through the following formula:

Gain1＝((MaxDBV-MinDBV)/(CurrentDBV-MinDBV))*EndPointGain；

and the EndPointGain is the second gain value, minDBV is the maximum brightness corresponding to the minimum DBV of the display screen, maxDBV is the maximum brightness corresponding to the maximum DBV of the display screen, and CurrentDBV is the maximum brightness corresponding to the adjusted DBV.

Corresponding to the embodiment of the method, the embodiment of the application also discloses a display screen brightness adjusting device. Referring to the schematic structural diagram shown in fig. 7, the terminal apparatus includes: a processor 1101 and a transmission interface 1102, wherein the processor 1101 is configured to call program instructions stored in a memory to execute all or part of the steps in the embodiments corresponding to fig. 1, fig. 4 and fig. 5, so as to adjust the brightness of the display screen.

Further, in the display screen brightness adjusting apparatus disclosed in the embodiment of the present application, the display screen brightness adjusting apparatus further includes: a memory. The memory is typically used for storing the first correspondence and the second correspondence. The first corresponding relation is specifically used for indicating the corresponding relation between the brightness of each pixel in the display screen, the maximum brightness corresponding to the DBV before adjustment, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen and a first gamma value before DBV adjustment; the second correspondence is specifically used for indicating correspondence between the brightness of each pixel in the display screen, the maximum brightness corresponding to the DBV after adjustment, the gray scale of each pixel in the display screen, and the maximum gray scale of the display screen and the second gamma value after adjustment of the DBV.

In the process of adjusting the brightness of the display screen, the processor 101 may implement the brightness adjustment of the display screen by reading the first corresponding relationship and the second corresponding relationship stored in the memory.

Further, the display screen brightness adjustment apparatus may further include a bus 1103. Additionally, the memories can include a random access memory 1104 and a read only memory 1105.

The processor is coupled to the transceiver, the random access memory and the read only memory through the bus respectively. When the terminal device needs to be operated, the device is guided to enter a normal operation state by starting a basic input and output system solidified in a read-only memory or a bootloader guiding system in an embedded system. After the device enters a normal operation state, an application program and an operating system are operated in the random access memory, so that the terminal device executes all or part of the steps in the embodiments corresponding to fig. 1, 4 and 5.

The device in the embodiment of the present invention may correspond to the display screen brightness adjusting device in the embodiment corresponding to fig. 6, and a processor and the like in the device may implement the functions of the device in the embodiment corresponding to fig. 6 and/or various steps and methods implemented, which are not described herein again for brevity.

Correspondingly, the embodiment of the application further discloses a display screen brightness adjusting device. Referring to the system diagram shown in fig. 8, the display screen brightness adjusting device includes: a Display Driver Integrated Circuit (DDIC) 100 and an Application Processor (AP) 200.

The AP is used for determining an adjusted display brightness value DBV and determining a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in the display screen after the display brightness value DBV is adjusted according to a first corresponding relation, wherein the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted;

the AP is further used for determining the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted according to the second corresponding relation;

and the DDIC is used for adjusting the brightness of each pixel in the mura area to the target brightness corresponding to each pixel.

And the AP can adopt a plurality of methods when determining the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted according to the second corresponding relation.

In one possible method, the AP may determine the respective corresponding brightness of the gray scale of each pixel in the mura area in the second corresponding relationship, and the respective corresponding brightness of the gray scale of each pixel in the second corresponding relationship is the target brightness of each pixel.

Or, in another possible method, the second corresponding relationship includes n gray scales and n luminances corresponding to the n gray scales, where n is a positive integer, and the second corresponding relationship is based on the second corresponding relationship. In this case, when determining the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted, the AP performs the following operations:

when the first gray scale of the first pixel in the mura area belongs to the n gray scales, determining that the corresponding brightness of the first gray scale in the second corresponding relation is the target brightness of the first pixel, wherein the first pixel is any one pixel in the mura area;

Or, in another possible method, when determining the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted, the AP performs the following operations:

determining a second brightness corresponding to a second gray scale of a second pixel in the mura area in the second corresponding relation, wherein the second pixel is any one pixel in the mura area;

determining a third brightness corresponding to the first target gray scale in the first corresponding relation;

determining the third brightness as a target brightness of the second pixel.

In this case, when the first correspondence relationship includes m gray scales and m luminances corresponding to the m gray scales, respectively, and m is a positive integer, the AP determines a third luminance corresponding to the first target gray scale in the first correspondence relationship by:

when the first target gray scale belongs to the m gray scales, determining the third brightness as the brightness corresponding to the first target gray scale in the first corresponding relation;

Alternatively, in another possible method, when determining the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted, the AP performs the following operations:

determining a second gain value according to the maximum brightness corresponding to the DBV before adjustment and the maximum brightness corresponding to the DBV after adjustment;

determining that a product of a gray scale of a third pixel in the mura area and the third gain value is a second target gray scale, wherein the third pixel is any one pixel in the mura area;

determining the fourth brightness as a target brightness of the third pixel.

Wherein, when the first corresponding relationship includes r gray scales and r luminances respectively corresponding to the r gray scales, and r is a positive integer, the operation of the AP determining a fourth luminance corresponding to the second target gray scale in the first corresponding relationship includes the following steps:

when the second target gray scale belongs to the r gray scales, determining the fourth brightness as the brightness corresponding to the second target gray scale in the first corresponding relation;

when the second target gray scale does not belong to the r gray scales, determining the fourth brightness as a brightness determined by performing interpolation processing on the r gray scales and r brightnesses respectively corresponding to the r gray scales.

Further, when the second target gray scale is larger than the gray scale of the display screen, the AP determines that the maximum brightness that can be displayed by the display screen after the DBV adjustment is the fourth brightness.

Further, in the embodiment of the present application, a memory 300 is further included. The memory 300 is used for storing the first corresponding relationship. The first corresponding relation is specifically used for indicating the corresponding relation between the brightness of each pixel in the display screen, the DBV before adjustment, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen and the first gamma value before DBV adjustment; the second correspondence is specifically used for indicating a correspondence between the brightness of each pixel in the display screen, the adjusted DBV, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen, and the second gamma value after the DBV is adjusted.

Or, the storage stores s gray scales and s luminances corresponding to the s gray scales in the first corresponding relationship respectively; or, the t gray scales and t luminances corresponding to the t gray scales in the first corresponding relationship are stored in the memory. Wherein s and t are both positive integers.

In this case, the AP may determine the target brightness corresponding to each pixel in the mura area of the display screen after adjusting the DBV by reading the content stored in the memory.

The embodiment of the application also discloses a display screen brightness adjusting device. The display screen brightness adjusting device comprises: DDIC and AP.

Wherein the AP is configured to determine an adjusted DBV. And, the AP is further configured to transmit the determined adjusted DBV to the DDIC.

The DDIC is used for determining a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area of the display screen after the DBV is adjusted according to a first corresponding relation, wherein the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted, and then determining the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted according to the second corresponding relation; and the DDIC is further configured to adjust the brightness of each pixel in the mura area to a target brightness corresponding to each pixel.

And the DDIC can adopt various methods when determining the respective target brightness of each pixel in the mura area of the display screen after adjusting the DBV according to the second corresponding relationship.

For the DDIC and the method for determining the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted, reference may be made to the above embodiments, and details are not repeated here.

Correspondingly, the embodiment of the application also discloses a display screen brightness adjusting device. The display screen brightness adjusting device comprises: DDIC and AP.

Wherein the AP is configured to determine an adjusted DBV.

And the DDIC and the AP determine the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted according to the adjusted DBV.

In a possible implementation manner, after determining the adjusted DBV, the AP may further determine, according to a first corresponding relationship, a second corresponding relationship between the brightness and the gray scale of each pixel in the non-mura area of the display screen after adjusting the DBV, where the first corresponding relationship is a corresponding relationship between the brightness and the gray scale of each pixel of the display screen before adjusting the DBV.

Then, the DDIC determines the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted according to the second corresponding relation; and the DDIC is further configured to adjust the brightness of each pixel in the mura area to a target brightness corresponding to each pixel.

Or, in another possible implementation manner, the AP and the DDIC jointly determine a second corresponding relationship between the brightness and the gray scale of each pixel in the non-mura area of the display screen after the DBV is adjusted, and determine, according to the second corresponding relationship, the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted. Then, the DDIC adjusts the brightness of each pixel in the mura area to the target brightness corresponding to each pixel.

In addition, in this scheme, the method adopted by the AP or the DDIC and the AP to jointly determine the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted may refer to the above embodiments, and is not described herein again.

In specific implementation, the embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium is used for storing the instructions. Wherein the instructions, when executed on a computer or processor, enable the computer or processor to perform all or a portion of the steps in the embodiments corresponding to fig. 1, 4 and 5. The storage medium of the computer readable medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a Random Access Memory (RAM), or the like.

In addition, another embodiment of the present application also provides a computer program product containing instructions, which when run on an electronic device, enables the electronic device to implement all or part of the steps in the embodiments corresponding to fig. 1, fig. 4 and fig. 5.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.

Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented using software plus any required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.

The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.

Claims

A display screen brightness adjusting method is characterized by comprising the following steps:

determining a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in the display screen after the DBV is adjusted according to the first corresponding relation, wherein the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted;

determining target brightness corresponding to each pixel in a mura area of the display screen after the DBV is adjusted according to the second corresponding relation;

and adjusting the brightness of each pixel in the mura area to be the target brightness corresponding to each pixel.
The method of claim 1,

the first corresponding relation is specifically used for indicating the corresponding relation between the brightness of each pixel in the display screen, the DBV before adjustment, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen and the first gamma value before DBV adjustment;

the second correspondence is specifically used for indicating a correspondence between the brightness of each pixel in the display screen, the adjusted DBV, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen, and the second gamma value after the DBV is adjusted.
The method according to claim 2, wherein determining a second corresponding relationship between the brightness and the gray scale of each pixel in the non-mura area of the display screen after adjusting the display brightness value DBV according to the first corresponding relationship comprises:

determining a second gamma value in the second corresponding relation according to a first gamma value in the first corresponding relation, wherein the difference value of the first gamma value and the second gamma value is within a preset range;

and determining the second corresponding relation according to the second gamma value and the adjusted DBV.
The method according to claim 2 or 3,

the first corresponding relation is as follows: (brightness of pixel/maximum brightness corresponding to DBV before adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g1 ；

The second corresponding relation is as follows: (brightness of pixel/maximum brightness corresponding to DBV after adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g2 ；

Wherein g1 is the first gamma value and g2 is the second gamma value.
The method according to any one of claims 1 to 4, wherein the determining, according to the second correspondence, target luminances corresponding to respective pixels in a mura area of the display screen after the DBV is adjusted comprises:

and determining the brightness of each pixel in the mura area corresponding to the gray scale in the second corresponding relation, wherein the brightness of each pixel corresponding to the gray scale in the second corresponding relation is the target brightness of each pixel.
The method according to any one of claims 1 to 4, wherein the second correspondence includes n gray scales and n luminances corresponding to the n gray scales, n is a positive integer, and the determining, according to the second correspondence, the target luminances corresponding to the respective pixels in the mura area of the display screen after the DBV is adjusted comprises:

when the first gray scale of the first pixel in the mura area belongs to the n gray scales, determining that the corresponding brightness of the first gray scale in the second corresponding relation is the target brightness of the first pixel, wherein the first pixel is any one pixel in the mura area;

when the first gray scale of the first pixel in the mura area does not belong to the n gray scales, performing interpolation processing on the n gray scales and n luminances corresponding to the n gray scales respectively to determine a first luminance corresponding to the first gray scale, wherein the first luminance is a target luminance of the first pixel.
The method according to any one of claims 1 to 4, wherein the determining, according to the second correspondence, target luminances corresponding to respective pixels in a mura area of the display screen after the DBV is adjusted comprises:

determining a second brightness corresponding to a second gray scale of a second pixel in the mura area in the second corresponding relation, wherein the second pixel is any one pixel in the mura area;

determining a third gray scale corresponding to the second brightness in the first corresponding relation;

determining a first gain value according to the second gray scale and the third gray scale, wherein the product of the first gain value and the third gray scale is a first target gray scale;

determining a third brightness corresponding to the first target gray scale in the first corresponding relation;

determining the third brightness as a target brightness of the second pixel.
The method of claim 7, wherein determining a first gain value based on the second gray level and the third gray level comprises:

determining the ratio of the third gray scale to the second gray scale as the first gain value;

alternatively, the first and second electrodes may be,

determining a ratio of the third gray scale to the second gray scale;

and in a preset first mapping relation, determining a gain value corresponding to the ratio of the third gray scale to the second gray scale as the first gain value, wherein the preset first mapping relation is a mapping relation between different ratios and corresponding gain values.
The method according to any one of claims 1 to 4, wherein the determining, according to the second correspondence, target luminances corresponding to respective pixels in a mura area of the display screen after the DBV is adjusted comprises:

determining a second gain value according to the maximum brightness corresponding to the DBV before adjustment and the maximum brightness corresponding to the DBV after adjustment;

determining a third gain value according to the maximum brightness corresponding to the adjusted DBV and the second gain value;

determining a product of a gray scale of a third pixel in the mura area and the third gain value as a second target gray scale, wherein the third pixel is any one pixel in the mura area;

determining a fourth brightness corresponding to the second target gray scale in the first corresponding relation;

determining the fourth brightness as a target brightness of the third pixel.
The method of claim 9, wherein when the second target gray level is greater than the gray level of the display screen, the determining a fourth luminance corresponding to the second target gray level in the first corresponding relationship comprises:

and determining that the maximum brightness which can be displayed by the display screen after the DBV is adjusted is the fourth brightness.
The method according to claim 9 or 10, wherein determining the second gain value according to the maximum brightness corresponding to the DBV before the adjustment and the maximum brightness corresponding to the DBV after the adjustment comprises:

determining the ratio of the maximum brightness corresponding to the DBV after adjustment to the maximum brightness corresponding to the DBV before adjustment as the second gain value;

alternatively, the first and second electrodes may be,

and in a preset second mapping relationship, determining a gain value corresponding to a ratio of the maximum brightness corresponding to the adjusted DBV to the maximum brightness corresponding to the pre-adjusted DBV as the second gain value, where the preset second mapping relationship is a mapping relationship between different ratios and corresponding gain values.
The method according to any of claims 9 to 11, wherein said determining a third gain value based on said adjusted DBV and said second gain value comprises:

determining a third gain value by the following equation:

Gain1＝((MaxDBV-MinDBV)/(CurrentDBV-MinDBV))*EndPointGain；

and the EndPointGain is the second gain value, minDBV is the maximum brightness corresponding to the minimum DBV of the display screen, maxDBV is the maximum brightness corresponding to the maximum DBV of the display screen, and CurrentDBV is the maximum brightness corresponding to the adjusted DBV.
A display screen brightness adjusting device, comprising:

the processing unit is used for determining a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in the display screen after the DBV is adjusted according to a first corresponding relation, wherein the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel in the display screen before the DBV is adjusted;

the processing unit is further configured to determine, according to the second correspondence, target brightness corresponding to each pixel in a mura area of the display screen after the DBV is adjusted;

and the brightness adjusting unit is used for adjusting the brightness of each pixel in the mura area to the target brightness corresponding to each pixel.
The apparatus of claim 13,

the first corresponding relation is specifically used for indicating the corresponding relation between the brightness of each pixel in the display screen, the DBV before adjustment, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen and the first gamma value before DBV adjustment;

the second correspondence is specifically used for indicating a correspondence between the brightness of each pixel in the display screen, the adjusted DBV, the gray scale of each pixel in the display screen, the maximum gray scale of the display screen, and the second gamma value after the DBV is adjusted.
The apparatus of claim 14,

the processing unit is specifically configured to:

determining a second gamma value in the second corresponding relation according to a first gamma value in the first corresponding relation, wherein the difference value of the first gamma value and the second gamma value is within a preset range;

and determining the second corresponding relation according to the second gamma value and the adjusted DBV.
The apparatus of claim 14 or 15,

the first corresponding relation is as follows: (brightness of pixel/maximum brightness corresponding to DBV before adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g1 ；

The second corresponding relation is as follows: (brightness of pixel/maximum brightness corresponding to DBV after adjustment) = (gray scale of pixel/maximum gray scale of display screen) ^g2 ；

Wherein g1 is the first gamma value and g2 is the second gamma value.
The apparatus according to any one of claims 13 to 16,

the processing unit is specifically configured to determine respective corresponding luminances of the gray scales of the pixels in the mura area in the second correspondence, where the respective corresponding luminances of the gray scales of the pixels in the second correspondence are target luminances corresponding to the pixels, respectively.
The apparatus according to any one of claims 13 to 16, wherein the second correspondence relationship comprises n gray levels and n luminances corresponding to the n gray levels, respectively, where n is a positive integer;

the processing unit is specifically configured to:

when the first gray scale of the first pixel in the mura area belongs to the n gray scales, determining that the corresponding brightness of the first gray scale in the second corresponding relation is the target brightness of the first pixel, wherein the first pixel is any one pixel in the mura area;

when the first gray scale of the first pixel in the mura area does not belong to the n gray scales, performing interpolation processing on the n gray scales and n luminances corresponding to the n gray scales respectively to determine a first luminance corresponding to the first gray scale, wherein the first luminance is a target luminance of the first pixel.
The apparatus according to any one of claims 13 to 16,

the processing unit is specifically configured to:

determining a second brightness corresponding to a second gray scale of a second pixel in the mura area in the second corresponding relation, wherein the second pixel is any one pixel in the mura area;

determining a third gray scale corresponding to the second brightness in the first corresponding relation;

determining a first gain value according to the second gray scale and the third gray scale, wherein the product of the first gain value and the third gray scale is a first target gray scale;

determining third brightness corresponding to the first target gray scale in the first corresponding relation;

determining the third brightness as a target brightness of the second pixel.
The apparatus of claim 19,

the processing unit is specifically configured to determine a ratio of the third gray scale to the second gray scale as the first gain value;

alternatively, the first and second electrodes may be,

the processing unit is specifically configured to:

determining a ratio of the third gray scale to the second gray scale;

and in a preset first mapping relation, determining a gain value corresponding to the ratio of the third gray scale to the second gray scale as the first gain value, wherein the preset first mapping relation is a mapping relation between different ratios and corresponding gain values.
The apparatus according to any one of claims 13 to 16,

the processing unit is specifically configured to:

determining a second gain value according to the maximum brightness corresponding to the DBV before adjustment and the maximum brightness corresponding to the DBV after adjustment;

determining a third gain value according to the maximum brightness corresponding to the adjusted DBV and the second gain value;

determining that a product of a gray scale of a third pixel in the mura area and the third gain value is a second target gray scale, wherein the third pixel is any one pixel in the mura area;

determining a fourth brightness corresponding to the second target gray scale in the first corresponding relation;

determining the fourth brightness as a target brightness of the third pixel.
The device of claim 21, wherein when the second target gray level is greater than the gray level of the display screen, the processing unit is specifically configured to determine that the maximum brightness that can be displayed by the display screen after the DBV adjustment is the fourth brightness.
The apparatus of claim 21 or 22,

the processing unit is specifically configured to determine that a ratio of the maximum brightness corresponding to the adjusted DBV to the maximum brightness corresponding to the pre-adjusted DBV is the second gain value;

alternatively, the first and second electrodes may be,

the processing unit is specifically configured to determine, in a preset second mapping relationship, that a gain value corresponding to a ratio of a maximum brightness corresponding to the adjusted DBV to a maximum brightness corresponding to the pre-adjusted DBV is the second gain value, where the preset second mapping relationship is a mapping relationship between different ratios and corresponding gain values.
The apparatus of any one of claims 21 to 23,

the processing unit is specifically configured to determine the third gain value by the following formula:

Gain1＝((MaxDBV-MinDBV)/(CurrentDBV-MinDBV))*EndPointGain；

wherein EndPointGain is the second gain value, minDBV is the maximum brightness corresponding to the minimum DBV of the display screen, maxDBV is the maximum brightness corresponding to the maximum DBV of the display screen, and CurrentDBV is the maximum brightness corresponding to the adjusted DBV.
A display screen brightness adjustment apparatus, characterized in that the apparatus comprises a processor and a transmission interface, the processor being configured to invoke program instructions stored in a memory to perform the method according to any of claims 1 to 14.
A display screen brightness adjusting device, comprising:

a display driver integrated circuit DDIC and an application processor AP;

the AP is used for determining the adjusted display brightness value DBV and determining a second corresponding relation between the brightness and the gray scale of each pixel in a non-mura area in the display screen after the display brightness value DBV is adjusted according to a first corresponding relation, wherein the first corresponding relation is the corresponding relation between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted;

the AP is further used for determining the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted according to the second corresponding relation;

and the DDIC is used for adjusting the brightness of each pixel in the mura area to be the target brightness corresponding to each pixel.
The apparatus of claim 26, further comprising: a memory;

the memory is used for storing the first corresponding relation and the second corresponding relation.
A computer-readable storage medium for storing instructions which, when executed on a computer or processor, cause the computer or processor to carry out the method of any one of claims 1-12.