WO2021232198A1

WO2021232198A1 - Display screen brightness adjustment method and apparatus

Info

Publication number: WO2021232198A1
Application number: PCT/CN2020/090875
Authority: WO
Inventors: 彭德彰; 许景翔; 刘洋; 韦育伦
Original assignee: 华为技术有限公司
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2021-11-25
Also published as: CN115552506A

Abstract

Provided are a display screen brightness adjustment method and apparatus. The method comprises: according to a first correlation, determining, after a display brightness value (DBV) is adjusted, a second correlation between the brightness and the grayscale of each pixel in a non-mura region in a display screen, wherein the first correlation is a correlation between the brightness and the grayscale of each pixel before the DBV is adjusted (S11); according to the second correlation, determining, after the DBV is adjusted, a target brightness corresponding to each pixel in a mura region of the display screen (S12); and adjusting the brightness of each pixel in the mura region to a corresponding target brightness (S13). After the DBV is adjusted, when conforming to the second correlation, the correlation between the grayscale and the brightness of each pixel in the display screen better conforms to the characteristics of human eyes, and the accuracy of demura processing can be improved, a compensation error of brightness compensation for the mura area can be reduced, the non-uniformity phenomenon of a picture in the display screen is reduced, the display quality of the display screen is improved, and the use experience of a user when using the display screen is improved.

Description

Method and device for adjusting brightness of display screen

Technical field

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

Background technique

With the continuous development of terminal technology, a variety of terminal devices have emerged, many of which include display screens, such as computers, mobile phones, and TVs. However, due to the inconsistency of the backlight source distribution, the drift of the semiconductor manufacturing process, and the different characteristics of the luminescent material, some display screens display images with uneven brightness. For example, some displays have higher brightness in the middle, and lower brightness on the left and right ends. Among them, the area with uneven brightness in the display screen is usually called the mura area.

Since the mura area will affect the screen display effect of the display and reduce the user experience, it is necessary to perform brightness compensation on the mura area to eliminate the mura area in the display. Among them, the technology to eliminate the mura area in the display is usually called demura technology.

The brightness of the display screen is related to the current display brightness value (DBV) of the display screen. Among them, DBV is used to indicate the maximum brightness value of each pixel in the display screen. In addition, the user will adjust the DBV of the display screen during the use of the terminal device. For example, when the surrounding environment becomes dark, in order to avoid eye discomfort caused by the brightness of the display screen being too strong, the user will lower the DBV of the display screen to make the brightness of the display screen softer. After adjusting the DBV of the display, it is necessary to re-demura the mura area in the display. In the prior art, when performing demura processing on the display screen after adjusting the DBV, it is generally considered that before and after the adjustment of the DBV, the brightness change of each pixel in the display shows a linear relationship, and based on the linear relationship, the brightness compensation is performed on the mura area after the adjustment of the DBV.

However, before and after the DBV adjustment, the brightness changes in the display screen do not show a linear relationship. Therefore, after the demura process is performed on the display screen after DBV adjustment by the prior art, the display often still has uneven brightness in the display screen, that is, The mura area still exists in the display.

Summary of the invention

In order to solve the problem that the mura area still exists in the display screen after the DBV adjusted display screen is demura processed by the prior art, embodiments of the present application provide a method and device for adjusting the brightness of the display screen.

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

According to the first correspondence, it is determined that after the display brightness value DBV is adjusted, the second correspondence between the brightness and the gray scale of each pixel in the non-mura area of the display screen is determined, and the first correspondence is that before the DBV is adjusted, The corresponding relationship between the brightness of each pixel of the display screen and the gray scale; according to the second corresponding relationship, determine the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted; The brightness of each pixel in the mura area is adjusted to the target brightness corresponding to each pixel.

In the solution of the embodiment of the present application, the first correspondence between the brightness and the gray scale of each pixel before the DBV adjustment is used to determine the difference 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 then use the second corresponding relationship to compensate the brightness of the pixels in the mura area. In addition, after adjusting the DBV, the corresponding relationship between the gray scale and the brightness of each pixel in the display screen conforms to the second corresponding relationship, which is more in line with the characteristics of human eyes. Therefore, determining the target brightness to be adjusted for the pixels in the mura area through the second correspondence relationship can improve the accuracy of the demura processing and reduce the compensation error of the brightness compensation for the pixels in the mura area.

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

In an optional design, the determining, according to the first correspondence, the second correspondence 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, includes:

According to the first gamma value in the first correspondence relationship, the second gamma value in the second correspondence relationship is determined, and the difference between the first gamma value and the second gamma value is in advance. Set within the range; determine the second correspondence relationship according to the second gamma value and the adjusted DBV.

In an optional design, the first correspondence relationship is: (pixel brightness/maximum brightness corresponding to DBV before adjustment)=(pixel grayscale/maximum grayscale of the display screen) ^g1 ; The corresponding relationship is: (the brightness of the pixel/the maximum brightness corresponding to the adjusted DBV)=(the gray scale of the pixel/the maximum gray scale of the display screen) ^g2 ; where g1 is the first gamma value, and g2 is the The second gamma value.

In an optional design, the determining, according to the second correspondence relationship, the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted includes:

Determine the respective brightness of the gray scale of each pixel in the mura area in the second correspondence relationship, and the respective brightness of the gray scale of each pixel in the second correspondence relationship is the respective brightness of each pixel The corresponding target brightness.

Through the above steps, the terminal device can determine the target brightness corresponding to the pixel in the mura area of the display screen after the DBV is adjusted, and because this method calculates the target corresponding to the pixel in real time according to the relational expression of the second correspondence relationship Brightness, therefore, the accuracy of determining the target brightness is high.

In an optional design, the second correspondence includes n gray levels and n brightnesses respectively corresponding to the n gray levels, and n is a positive integer. According to the second correspondence, After the DBV is adjusted, the target brightness corresponding to each pixel in the mura area of the display screen is determined, including:

When the first gray scale of the first pixel in the mura area belongs to the n gray scales, it is determined that the brightness corresponding to the first gray scale in the second correspondence relationship is the target of the first pixel Brightness, the first pixel is any pixel in the mura area; when the first gray level of the first pixel in the mura area does not belong to the n gray levels, the Interpolation processing is performed on the n brightness levels corresponding to the n gray levels and the n gray levels to determine the first brightness corresponding to the first gray level, where the first brightness is the target brightness of the first pixel.

Through the above steps, the terminal device 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 implemented according to the target brightness. In addition, the terminal device only needs to store n gray levels, and the n brightnesses corresponding to the n gray levels in the second correspondence relationship. Therefore, the storage space occupied by this method is small. Moreover, this solution determines the target brightness according to the n gray levels and the respective brightness of the n gray levels in the second corresponding relationship, and there is no need to perform real-time calculation through the corresponding relationship between the gray levels and the brightness. Therefore, the amount of calculation is small, and accordingly, the efficiency of determining the target brightness of the first pixel is improved.

Determine the second brightness corresponding to the second gray scale of the second pixel in the mura area in the second correspondence, where the second pixel is any pixel in the mura area; determine the second brightness Corresponding to the third gray scale in the first correspondence relationship; determine a first gain value according to the second gray scale and the third gray scale, the first gain value and the third gray scale The product is the first target gray scale; the third brightness corresponding to the first target gray scale in the first correspondence is determined; the third brightness is determined to be the target brightness of the second pixel.

In an optional design, the first correspondence relationship includes m gray levels and m brightnesses respectively corresponding to the m gray levels, and m is a positive integer, and the first target gray level is determined The corresponding third brightness in the first correspondence relationship includes:

When the first target gray scale belongs to the m gray scales, it is determined that the third brightness is the brightness corresponding to the first target gray scale in the first corresponding relationship; when the first target gray scale When it does not belong to the m gray scales, it is determined that the third brightness is the brightness determined after interpolation processing is performed on the m gray scales and the m brightnesses respectively corresponding to the m gray scales.

Through the above steps, the terminal device 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 implemented according to the target brightness. In addition, the terminal device only needs to store m gray levels and the m brightnesses corresponding to the m gray levels in the second correspondence relationship. Therefore, the storage space occupied by this method is small. Moreover, this solution determines the target brightness according to the m gray scales and the respective brightnesses of the m gray scales in the first corresponding relationship, and there is no need to perform real-time calculation through the corresponding relationship between gray scales and brightness. Therefore, the amount of calculation is small, and accordingly, the efficiency of determining the target brightness of the first pixel is improved.

In an optional design, the determining the first gain value according to the second gray scale and the third gray scale includes:

Determine the ratio of the third gray level to the second gray level as the first gain value; or determine the ratio of the third gray level to the second gray level; In the mapping relationship, it is determined that the gain value corresponding to the ratio of the third gray scale to the second gray scale is the first gain value, and the preset first mapping relationship is different ratios and corresponding gain values The mapping relationship between.

Determine the second gain value according to the maximum brightness corresponding to the DBV before adjustment and the maximum brightness corresponding to the adjusted DBV; determine the third gain according to the maximum brightness corresponding to the adjusted DBV and the second gain value Value; determining that the product of the gray scale of the third pixel in the mura area and the third gain value is the second target gray scale, and the third pixel is any pixel in the mura area; determining the The fourth brightness corresponding to the second target gray scale in the first correspondence; determining that the fourth brightness is the target brightness of the third pixel.

In an optional design, the first correspondence relationship includes r gray levels and r brightnesses respectively corresponding to the r gray levels, where r is a positive integer, and the second target gray level is determined The corresponding fourth brightness in the first correspondence relationship includes:

When the second target gray scale belongs to the r gray scales, it is determined that the fourth brightness is the brightness corresponding to the second target gray scale in the first correspondence relationship; when the second target gray scale When the scale does not belong to the r gray scales, it is determined that the fourth brightness is the brightness determined by performing interpolation processing on the r gray scales and the r brightnesses corresponding to the r gray scales respectively.

Through the above steps, the terminal device 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 implemented according to the target brightness. In addition, the terminal device only needs to store r gray levels, and the r gray levels corresponding to the r brightness in the second correspondence relationship. Therefore, the storage space occupied by this method is small. Moreover, this solution determines the target brightness according to the r gray levels and the brightness corresponding to the r gray levels in the second correspondence relationship, and there is no need to perform real-time calculation through the corresponding relationship between the gray levels and the brightness. Therefore, the amount of calculation is small, and accordingly, the efficiency of determining the target brightness of the first pixel is improved.

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

It is determined that after the DBV adjustment, the maximum brightness that can be displayed on the display screen is the fourth brightness.

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

It is determined that the ratio of the maximum brightness corresponding to the adjusted DBV to the maximum brightness corresponding to the DBV before adjustment is the second gain value; or, in a preset second mapping relationship, it is determined that the adjusted The gain value corresponding to the ratio of the maximum brightness corresponding to the DBV to the maximum brightness corresponding to the DBV before adjustment is the second gain value, and the preset second mapping relationship is between different ratios and corresponding gain values The mapping relationship.

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

Determine the third gain value by the following formula: Gain1=((MaxDBV-MinDBV)/(CurrentDBV-MinDBV))*EndPointGain; where EndPointGain is the second gain value, and MinDBV is the value corresponding to the minimum DBV of the display screen Maximum brightness, 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 brightness adjustment device for a display screen, including: a processing unit, configured to determine, according to a first corresponding relationship, that after adjusting the display brightness value DBV, the value of each pixel in the non-mura area of the display screen is A second corresponding relationship between brightness and grayscale, where the first corresponding relationship is the corresponding relationship between the brightness and grayscale of each pixel of the display screen before the DBV is adjusted; the processing unit is also used for According to the second correspondence, it is determined that after the DBV is adjusted, the respective target brightness of each pixel in the mura area of the display screen is determined; the brightness adjustment unit is configured to adjust the brightness of each pixel in the mura area to The target brightness corresponding to each pixel.

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

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

Determine the second correspondence relationship according to the second gamma value and the adjusted DBV.

In an optional design, the processing unit is specifically configured to determine the respective brightness of each pixel in the mura area in the second correspondence relationship, and the gray scale of each pixel is in the second correspondence. The respective brightness in the second correspondence relationship is the target brightness corresponding to each pixel.

In an optional design, the second correspondence relationship includes n gray levels and n brightnesses corresponding to the n gray levels, and 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 brightness corresponding to the first gray scale in the second correspondence relationship is the target brightness of the first pixel, The first pixel is any 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, by comparing the n gray scales and Interpolation processing is performed on n brightnesses corresponding to the n gray scales to determine the first brightness corresponding to the first gray scale, where the first brightness is the target brightness of the first pixel.

In an optional design, the processing unit is specifically configured to: determine the second brightness corresponding to the second gray scale of the second pixel in the mura area in the second correspondence, and the second pixel is Any pixel in the mura area; determine the third gray scale corresponding to the second brightness in the first correspondence relationship; determine the first gain according to the second gray scale and the third gray scale Value, the product of the first gain value and the third gray level is the first target gray level; determine the third brightness corresponding to the first target gray level in the first correspondence; determine the first The tri-brightness is the target brightness of the second pixel.

In an optional design, the first correspondence relationship includes m gray levels and m brightnesses corresponding to the m gray levels, and m is a positive integer; the processing unit is specifically configured to: When the first target gray scale belongs to the m gray scales, it is determined that the third brightness is the brightness corresponding to the first target gray scale in the first corresponding relationship; when the first target gray scale does not belong to In the case of the m gray scales, it is determined that the third brightness is the brightness determined after interpolation processing is performed on the m gray scales and the m brightnesses corresponding to the m gray scales.

In an alternative design, the processing unit is specifically configured to determine that the ratio of the third gray scale to the second gray scale is the first gain value; or, the processing unit is specifically configured to: Determine the ratio of the third gray level to the second gray level; in the preset first mapping relationship, determine that the gain value corresponding to the ratio of the third gray level to the second gray level is For the first gain value, the preset first mapping relationship is a mapping relationship between different ratios and corresponding gain values.

In an optional design, the processing unit is specifically configured to: determine the second gain value according to the maximum brightness corresponding to the DBV before adjustment and the maximum brightness corresponding to the adjusted DBV; and according to the adjusted DBV Corresponding to the maximum brightness and the second gain value, determine a third gain value; determine that the product of the gray scale of the third pixel in the mura area and the third gain value is the second target gray scale, the first Three pixels are any pixel in the mura area; determine the fourth brightness corresponding to the second target gray scale in the first correspondence relationship; determine that the fourth brightness is the target brightness of the third pixel .

In an optional design, the first correspondence relationship includes r gray levels and r brightnesses corresponding to the r gray levels, 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, it is determined that the fourth brightness is the brightness corresponding to the second target gray scale in the first correspondence; when the second target gray scale is not When it belongs to the r gray scales, it is determined that the fourth brightness is the brightness determined by performing interpolation processing on the r gray scales and the r brightnesses respectively corresponding to the r gray scales.

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

In an optional design, the processing unit is specifically configured to: determine that the ratio of the maximum brightness corresponding to the adjusted DBV to the maximum brightness corresponding to the DBV before adjustment is the second gain value; or, The processing unit is specifically configured to, in the preset second mapping relationship, determine that the gain value corresponding to the ratio of the maximum brightness corresponding to the adjusted DBV to the maximum brightness corresponding to the DBV before adjustment is the first Two gain values, the preset second mapping relationship is a mapping relationship between different ratios and corresponding gain values.

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

Gain1=((MaxDBV-MinDBV)/(CurrentDBV-MinDBV))*EndPointGain; where EndPointGain is the second gain value, MinDBV is the maximum brightness corresponding to the minimum DBV of the display screen, and MaxDBV is the maximum brightness of the display screen The maximum brightness corresponding to the maximum DBV, and CurrentDBV is the maximum brightness corresponding to the adjusted DBV.

In a third aspect, an embodiment of the present application provides a brightness adjustment device for a display screen. The device includes a processor and a transmission interface, and the processor is configured to call program instructions stored in a memory to execute the method according to the first aspect.

In a fourth aspect, an embodiment of the present application provides a brightness adjustment device for a display screen, including:

Display driver integrated circuit DDIC and application processor AP;

The AP is used to determine the adjusted display brightness value DBV, and according to the first corresponding relationship, determine the second difference between the brightness and gray scale of each pixel in the non-mura area of the display screen after the display brightness value DBV is adjusted. Correspondence, the first correspondence is the correspondence between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted; the AP is also used to determine the After adjusting the DBV, the target brightness corresponding to each pixel in the mura area of the display screen;

The DDIC is used to adjust the brightness of each pixel in the mura area to the target brightness corresponding to each pixel.

In an optional design, it also includes: memory;

The memory is used to store the first correspondence and the second correspondence;

Wherein, the first corresponding relationship is the corresponding relationship between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted, and the second corresponding relationship is that after the DBV is adjusted, the display screen The second correspondence between the brightness of each pixel in the mura area and the gray scale.

In a fifth aspect, an embodiment of the present application provides a display brightness adjustment device, including:

Display driver integrated circuit DDIC and application processor AP;

The AP is used to determine the adjusted display brightness value DBV;

The DDIC is used to determine, according to the first correspondence, the second correspondence 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, the first correspondence In order to adjust the DBV, the corresponding relationship between the brightness of each pixel of the display screen and the gray scale; according to the second corresponding relationship, it is determined that after the DBV is adjusted, each pixel in the mura area of the display screen is Corresponding target brightness; adjusting the brightness of each pixel in the mura area to the target brightness corresponding to each pixel.

In an optional design, it also includes: memory;

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

Display driver integrated circuit DDIC and application processor AP;

The AP is used to determine the adjusted display brightness value DBV;

The DDIC and the AP are used together to determine the 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, so The first corresponding relationship is the corresponding relationship between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted; according to the second corresponding relationship, it is determined that the mura area of the display screen is determined after the DBV is adjusted. Each pixel in the corresponding target brightness.

The DDIC is also used to adjust 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, the computer-readable storage medium is used to store instructions, and when the instructions run on a computer or a processor, the computer or the processor The device implements the method as described in the first aspect.

In an eighth aspect, the embodiments of the present application provide a computer program product containing instructions. When the computer program product runs on an electronic device, the electronic device can implement all or part of the corresponding embodiments in the first aspect step.

Furthermore, since the solution provided by the embodiments of the present application improves the accuracy of demura processing and reduces the unevenness of the screen in the display screen, it can also improve the display quality of the display screen and improve the user's use when using the display screen. Experience.

Moreover, after the DBV-adjusted display screen is subjected to demura processing by the prior art, the display screen often still has uneven brightness. Therefore, the display screen is often difficult to pass the picture quality (PQ) acceptance. Among them, PQ acceptance refers to the display effect of the display screen viewed by naked eyes, to determine whether the display quality of the display screen meets the standard.

The solution provided by the embodiments of the present application improves the display quality of the display screen, and correspondingly, also improves the pass rate of the display screen to pass the PQ acceptance.

Description of the drawings

FIG. 1 is a schematic diagram of a working flow of a method for adjusting the brightness of a display screen disclosed in an embodiment of the application;

2 is a schematic diagram of a relationship curve of a first corresponding relationship disclosed in an embodiment of the application;

3 is a schematic diagram of a relationship curve of a second corresponding relationship disclosed in an embodiment of the application;

4 is a schematic diagram of a workflow for determining target brightness in a method for adjusting the brightness of a display screen disclosed in an embodiment of the application;

FIG. 5 is a schematic diagram of another workflow for determining the target brightness in a method for adjusting the brightness of a display screen disclosed in an embodiment of the application; FIG.

6 is a schematic structural diagram of a display brightness adjustment device disclosed in an embodiment of the application;

FIG. 7 is a schematic structural diagram of a terminal device disclosed in an embodiment of the application;

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

Detailed ways

The terms "first", "second", and "third" in the description, claims, and description of the drawings in this application are used to distinguish different objects, rather than to limit a specific order.

In the embodiments of the present application, words such as "exemplary" or "for example" are used as examples, illustrations, or illustrations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as "exemplary" or "for example" are used to present related concepts in a specific manner.

In order to make the description of the following embodiments clear and concise, first a brief introduction of related technologies is given:

At present, various terminal devices are equipped with display screens, and the display screens include various types. For example, the display screens include traditional liquid crystal display screens and organic light emitting diode (OLED) display screens.

Among them, different types of display screens are affected by different reasons, and the displayed pictures sometimes have uneven brightness. For example, affected by the inconsistency of the backlight source distribution, the LCD screen usually has uneven brightness of the screen; affected by the drift of the semiconductor process and the different characteristics of the luminescent material, the OLED display sometimes has uneven brightness of the screen. Phenomenon.

The uneven brightness of the screen refers to the phenomenon that when the power of the driving current input to each area of the display screen is the same, the brightness of different areas in the screen of the display screen has large differences. For example, the brightness of the middle area of some display screens is higher, while the brightness of the left and right ends is lower. Among them, the area with uneven brightness in the display screen is usually called the mura area.

The existence of the mura area will affect the screen display effect of the display and reduce the user experience. Therefore, the brightness compensation of the mura area is required to eliminate the mura area in the display. The technology to eliminate the mura area in the display is usually called demura technology.

At present, the demura technology usually includes the following steps: first, collect the grayscale image of the display screen at a certain display brightness value DBV; then, determine the brightness and grayscale mapping relationship in the grayscale image, for example, based on the display screen Determine the mapping relationship between the brightness and the grayscale. In the mapping relationship, usually the maximum brightness corresponding to DBV corresponds to the maximum grayscale supported by the display screen, for example, the maximum When the brightness is 300nits and the maximum grayscale supported by the display is 255, in the mapping relationship, the brightness corresponding to grayscale 255 is 300nits; according to the mapping relationship, the terminal device selects several grayscales and the grayscale Map the corresponding brightness in the mapping relationship, and store the selected gray levels and their corresponding brightness as a brightness compensation table. For example, when the maximum brightness corresponding to the DBV of the display screen is 300 nits, the brightness compensation table stored by the terminal device may include : 31nits for 32 grayscales, 75nits for 64 grayscales, and 150nits for 192 grayscales; during the brightness compensation process, determine the grayscale of the pixels in the mura area of the display, and determine the grayscale based on the brightness compensation table. Corresponding brightness, and then adjust the brightness of the pixel to the brightness corresponding to the gray scale determined according to the brightness compensation table to realize the brightness compensation of the pixel to eliminate the mura area of the display screen.

In addition, the DBV of the display screen is sometimes adjusted during the use of the terminal device. For example, when the display screen senses a change in the light in the surrounding environment or receives a user's adjustment operation on the DBV, the terminal device will adjust the DBV of the display screen accordingly. .

Wherein, DBV is used to indicate the maximum brightness value that can be displayed by each pixel in the display screen, and the maximum brightness value that can be displayed by each pixel corresponding to different DBV is different. Generally, when the DBV of the display screen is larger, the maximum brightness value that can be displayed by each pixel in the display screen is higher.

In a feasible implementation manner, in order to facilitate the user to adjust the brightness of the display screen, a brightness progress bar can be displayed in the display interface of the display screen, and the user can drag the brightness progress bar to realize the brightness progress. Article adjustment. By adjusting the brightness progress bar, the DBV of the display screen can be adjusted to realize the adjustment of the maximum brightness value displayed by each pixel in the display screen.

Exemplarily, when the brightness progress bar is adjusted to a full frame, the maximum brightness corresponding to the DBV of the display screen is 300 nits. In this case, the maximum brightness value that can be displayed by each pixel in the display screen is 300 nits; When the brightness progress bar is adjusted to half a grid, the maximum brightness corresponding to the DBV of the display screen is 150 nits. In this case, the maximum brightness value that can be displayed by each pixel in the display screen is 150 nits.

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

Specifically, when performing demura processing on the display screen after adjusting the DBV, first determine the ratio of the maximum brightness corresponding to the DBV before and after the adjustment. For example, if the maximum brightness corresponding to the DBV before the adjustment is 300 nits, the DBV after the adjustment corresponds to If the maximum brightness is 150 nits, the ratio is 0.5; then, the gain coefficient is determined based on the ratio. Illustratively, the ratio of the maximum brightness corresponding to the DBV before and after the adjustment can be used as the gain coefficient, or the mapping relationship can also be preset, The mapping relationship includes a one-to-one correspondence 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 the adjustment; the brightness compensation table before the DBV adjustment and the gain coefficient are used, Determine the new brightness compensation table. For example, before adjusting the DBV, the brightness corresponding to the 64 gray scale is 75nits, and after adjusting the DBV, the determined gain coefficient is 0.5. In this case, in the new brightness compensation table, The brightness corresponding to 64 gray scales is 37.5nits. Further, when the gray level of a pixel in the mura area is 64 gray levels, the brightness of the pixel will be adjusted to 37.5 nits during the demura process to realize the brightness compensation of the pixel, so it is hoped to eliminate the adjustment DBV The mura area afterwards.

However, before and after the DBV adjustment, the brightness change of each pixel in the display screen does not show a linear relationship. 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. Correspondingly, the brightness corresponding to a pixel with 64 gray levels is not 37.5 nits. Therefore, after the demura process is performed on the display screen through the above-mentioned solution, the display screen often still has uneven brightness, that is, the display screen still includes the mura area.

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

The embodiments of the present application will be described below in detail with reference to the accompanying drawings to clarify the method and device for adjusting the brightness of the display screen provided by the present application.

In an embodiment of the present application, a method for adjusting the brightness of a display screen is provided. Referring to the schematic diagram of the work flow shown in FIG. 1, the method for adjusting the brightness of the display screen includes the following steps:

Step S11: Determine, according to the first correspondence relationship, a second correspondence relationship 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.

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

In the first corresponding relationship, the maximum brightness corresponding to DBV usually 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 display screen When the maximum gray scale is supported, the brightness of the pixel is the maximum brightness corresponding to the DBV.

Exemplarily, 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 300 nits, then when the gray scale of a certain pixel in the display screen is 255, the brightness of the pixel is 300nits. In addition, in this example, the first corresponding relationship may further include: 32 gray levels corresponding to 31 nits, 64 gray levels corresponding to 75 nits, and 192 gray levels corresponding to 150 nits.

Wherein, in the second corresponding relationship, the maximum brightness corresponding to the adjusted DBV usually 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 adjusting the DBV, if the gray scale of a certain pixel in the display screen is 255, the brightness of the pixel It is 150nits.

Step S12: Determine the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted according to the second correspondence.

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

Step S13: Adjust the brightness of each pixel in the mura area to a target brightness corresponding to each pixel.

In the above steps, by adjusting the brightness of each pixel to the target brightness, 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 embodiments of the present application, according to the first corresponding relationship between each brightness of the display screen and the gray scale before adjusting the DBV, it is determined that after the DBV is adjusted, the non-mura area in the display screen is According to the second corresponding relationship between the brightness and the gray scale, the target brightness corresponding to each pixel in the mura area of the display screen is determined after the DBV is adjusted, and each pixel in the mura area is The brightness of is adjusted to 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 the The product of the brightness corresponding to each pixel before the DBV adjustment determines the brightness after the DBV adjustment. However, before and after the DBV adjustment, the brightness change of each pixel in the display does not show a linear relationship. Therefore, after the demura processing is performed by the prior art, the display often still has uneven brightness, that is, the display still includes mura. area.

In the solution of the embodiment of the present application, the first correspondence between the brightness and the gray scale of each pixel before the DBV adjustment is used to determine the difference between the brightness and the gray scale of each pixel in the non-mura area of the display screen after the DBV is adjusted. In the second correspondence between the two, the second correspondence is used to compensate the brightness of the pixels in the mura area, that is, the target brightness of the pixels in the mura area that needs to be adjusted is determined through the second correspondence.

After adjusting the DBV, the corresponding relationship between the gray scale and brightness of each pixel in the display screen is more in line with the characteristics of the human eye when it meets the second corresponding relationship. Therefore, the mura area of the display screen after the DBV adjustment is demura based on the second corresponding relationship. The effect is better. Therefore, compared with the solution in the prior art, the solution of the embodiment of the present application can improve the accuracy of the demura processing and reduce the compensation error of the brightness compensation for the pixels in the mura area.

In the embodiment of the present application, the first correspondence is specifically used to indicate that before the DBV adjustment, the brightness of each pixel in the display screen, the DBV before adjustment, the gray scale of each pixel in the display screen, and the Correspondence between the maximum gray scale of the display screen and the first gamma value.

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

In this case, according to the first correspondence in step S11, after the display brightness value DBV is adjusted, the second correspondence between the brightness and the gray scale of each pixel in the non-mura area of the display screen is determined, including the following step:

First, according to the first gamma value in the first correspondence relationship, the second gamma value in the second correspondence relationship is determined, and the difference between the first gamma value and the second gamma value Within the preset range;

Then, the second correspondence relationship is determined according to the second gamma value and the adjusted DBV.

Before and after the DBV adjustment, for the same display screen, the corresponding gamma values are similar, that is, the difference between the first gamma value and the second gamma value before and after the DBV adjustment is within the preset range.

The preset range may reflect the similarity between the first gamma value and the second gamma value. In the embodiment of the present application, the preset range can be set according to the requirements of the precision of the demura processing. When the precision of the demura processing is required to be high, the difference between the first gamma value and the second gamma value is required. If the degree of similarity is high, the absolute value of each value in the preset range is usually a small value; when the precision of the demura processing is low, the first gamma value and the second gamma value are The degree of similarity between the two may be lower, and the absolute value of each value in the preset range may be a larger value.

In particular, when the precision 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 feasible implementation manner, the first corresponding relationship is: (brightness of the pixel/maximum brightness corresponding to the DBV before adjustment)=(gray level of the pixel/maximum gray level of the display screen) ^g1 .

Correspondingly, the second corresponding relationship is: (brightness of the pixel/maximum brightness corresponding to the adjusted DBV)=(gray scale of the pixel/maximum gray scale of the 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 each pixel in the display screen can reach before the DBV adjustment. In addition, 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 adjustment of the DBV.

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

In order to clarify the advantages of the solution provided by this application, this application also provides the following examples:

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

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

When performing demura processing on the display screen in the prior art, first determine the ratio of the maximum brightness after adjustment to the DBV before adjustment, that is, 150/300=0.5, and based on this, the gain coefficient can be determined to be 0.5; then, 64 gray is determined The brightness of the first-order pixel is the product of 0.5 and 75 nits, that is, 37.5 nits, and then the brightness of the pixel is adjusted to 37.5 nits. That is to say, in the prior art, the pixels of 64 gray scales are adjusted to 37.5 nits.

When applying the solution provided in the embodiment of the present application, a second corresponding relationship is determined according to the first corresponding relationship, and the second gamma value in the second corresponding relationship is the same as the first one in the first corresponding relationship. The difference of the gamma value is within the preset range. In this case, in this example, the determined relationship curve of the second corresponding relationship is shown in FIG. 3. Among them, in the coordinate system shown in FIG. 3, the horizontal axis is the gray scale of the pixel, and the vertical axis is the brightness of the pixel.

Referring to FIG. 3, in the second corresponding relationship, the brightness corresponding to 32 gray scales is 16 nits, the brightness corresponding to 61 gray scales is 31 nits, the brightness corresponding to 64 gray scales is 33 nits, and the brightness corresponding to 180 gray scales is 75 nits, 192 The brightness corresponding to the gray scale is 100 nits, and the brightness corresponding to the 255 gray scale is 150 nits.

In other words, after adjusting the maximum brightness corresponding to the DBV of the display screen from 300nits to 150nits, the brightness corresponding to 32 gray scales is changed from 31nits to 16nits, the brightness corresponding to 64 gray scales is changed from 75nits to 33nits, and the brightness corresponding to 192 gray scales is changed from 75nits to 33nits. The brightness 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 in Figure 3, when the gray level of a pixel in the mura area is 64, it can be determined that the brightness of the pixel is 33nits. During the demura processing, the brightness of the pixel is adjusted to 33nits. . That is to say, through the solution provided by the embodiment of the present application, the pixels of 64 gray scales are adjusted to 33 nits.

Comparing the solutions provided by the embodiments of the present application with the solutions in the prior art, it can be seen that the brightness of the pixels of the same gray scale determined by the two solutions are not the same, while the brightness of the pixels determined by the solutions provided by the embodiments of the present application are different. It is closer to the required brightness of the pixel, where the required brightness of the pixel refers to the theoretical brightness that the pixel should present if there is no mura phenomenon. Therefore, the solution provided by the embodiment of the present application can improve the accuracy of the demura processing and reduce the compensation error of the brightness compensation of the pixels in the mura area.

In the embodiment of the present application, the operation includes 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 correspondence. Among them, this operation can be achieved in a variety of ways.

In a feasible implementation manner, the determining, according to the second correspondence, the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted includes:

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

Wherein, each gray scale in the second corresponding relationship and the brightness corresponding to the gray scale may be stored by storing the expression of the second corresponding relationship. Exemplarily, when the second corresponding relationship is: (brightness of the pixel/maximum brightness corresponding to the adjusted DBV)=(gray scale of the pixel/maximum gray scale of the display screen) ^g2 , this relational expression may be stored .

In this case, when the gray level of a certain pixel in the mura area of the display screen is determined after the DBV adjustment, the brightness of the pixel in the relational expression can be calculated according to the stored relational expression of the second corresponding relation , The brightness is the target brightness corresponding to the pixel.

Through the above steps, after adjusting the DBV, the display chip can calculate the target brightness of the target pixel in real time according to the pre-stored relational expression, the grayscale value of the target pixel, and the maximum brightness corresponding to the adjusted DBV, and calculate the target brightness according to the target brightness. The pixels are subjected to brightness compensation to realize demura processing. Exemplarily, the pre-stored relational expression is as follows:

(Brightness of pixel/Maximum brightness corresponding to DBV)=(Gray scale of pixel/Maximum gray scale of display screen) ^g

In the embodiment of the application, the display chip pre-stores the corresponding relational expressions of DBV, pixel gray scale and pixel brightness. After adjusting the DBV, the display chip obtains the maximum brightness corresponding to the adjusted DBV and the corresponding target pixel to be compensated. For the grayscale value, the brightness corresponding to the pixel to be compensated can be calculated in real time based on the pre-stored relational expression, and the brightness can be used as the compensated brightness value.

Further, since this method calculates the target brightness corresponding to the pixel in real time according to the relational expression of the second correspondence relationship, the accuracy of determining the target brightness is relatively high.

In another feasible implementation manner, the second correspondence relationship includes n gray levels and n brightnesses respectively corresponding to the n gray levels, and n is a positive integer.

In this case, n gray levels can be obtained through the second correspondence relationship, and the n brightnesses corresponding to the n gray levels in the second correspondence relationship can be obtained, and the n gray levels can be stored. The corresponding relationship between the order and the n brightness. Moreover, in this solution, the target brightness of the pixel is determined according to the n gray scales and the n brightnesses corresponding to the n gray scales.

In a feasible design, n can be determined to be 3, that is, to determine the 3 brightnesses corresponding to the 3 gray levels in the second correspondence relationship.

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

Correspondingly, the 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 correspondence relationship includes the following steps:

When the first gray scale of the first pixel in the mura area belongs to the n gray scales, it is determined that the brightness corresponding to the first gray scale in the second correspondence relationship is the target of the first pixel Brightness, the first pixel is any pixel in the mura area.

In an example, after the DBV of the display screen is adjusted, the corresponding brightness is 150nits, and the relationship curve of the second corresponding relationship is shown in Figure 3, n is 3, and the three determined gray levels are 32 gray levels and 64 gray levels. And 192 gray levels, 32 gray levels correspond to 16 nits in the second correspondence, 64 gray levels correspond to 33 nits in the second correspondence, and 192 gray scales in the second correspondence The corresponding brightness in the relationship is 100nits.

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

When the first gray scale of the first pixel in the mura area does not belong to the n gray scales, by performing interpolation processing on the n gray scales and the n luminances corresponding to the n gray scales, The first brightness corresponding to the first gray scale is determined, where the first brightness is the target brightness of the first pixel.

When performing interpolation processing on the n gray scales and the n brightnesses corresponding to the n gray scales, it is usually the adjacent gray scales of the first gray scale among the n gray scales, and The brightness corresponding to the adjacent gray scale is subjected to interpolation processing.

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

In this case, the adjacent gray scales of the first gray scale are 32 gray scales and 64 gray scales. In the embodiment of the present application, the brightness corresponding to 32 gray scales and 32 gray scales, and 64 gray scales and 64 gray scales can be compared. The brightness corresponding to the gray scale is interpolated, and the brightness corresponding to the 50 gray scale is determined through the interpolation processing.

In addition, before the DBV adjustment and after the DBV adjustment, the brightness of pixels with a gray scale of 0 in the display screen are all 0nits. When the first gray scale of the first pixel in the mura area does not belong to the n gray scales, and the first gray scale is less than the smallest gray scale among the n gray scales, then the first gray scale The adjacent gray scale of is 0 gray scale and the smallest gray scale among the n gray scales, and the first gray scale can be determined by interpolation processing of the 0 gray scale and the smallest gray scale among the n gray scales The corresponding brightness.

In this case, in the above example, if the first gray scale is 15 gray scales, the first gray scale is smaller than the smallest gray scale among the three gray scales, and the adjacent gray scales of the first gray scale are 0 and 32, by interpolating 0 and 32, calculate the corresponding brightness when the gray scale of the pixel is 15.

In addition, in the embodiment of the present application, when performing interpolation processing on the n gray levels and the n luminances corresponding to the n gray levels, multiple types of interpolation processing methods can be used. This is not limited. Exemplarily, the interpolation method used in the embodiment of the present application may be a linear interpolation method.

Through the above steps, the terminal device 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 implemented according to the target brightness.

Further, in this solution for determining the target brightness, the terminal device only needs to store n gray levels and the n brightnesses corresponding to the n gray levels in the second correspondence relationship. Therefore, the storage space occupied by this method is Smaller.

Moreover, in this solution, when the first gray scale belongs to the n gray scales, the first pixel can be determined according to the stored correspondence between the n gray scales and the n brightness When the first gray scale does not belong to the n gray scales, the n gray scales and the brightness corresponding to the n gray scales are interpolated to determine the The target brightness of the first pixel does not need to be calculated in real time through the relationship between the gray scale and the brightness, so the amount of calculation is small, and accordingly, the efficiency of determining the target brightness of the first pixel is improved.

Or, in another feasible implementation manner, referring to the schematic work flow diagram shown in FIG. 4, it is determined according to the second correspondence relationship that after the DBV is adjusted, each pixel in the mura area of the display The corresponding target brightness includes the following steps:

Step S21: Determine the second brightness corresponding to the second gray scale of the second pixel in the mura area in the second correspondence, and determine the third brightness corresponding to the second brightness in the first correspondence. Grayscale. Wherein, the second pixel may be any pixel in the mura area.

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

Exemplarily, before adjusting the DBV, the maximum brightness corresponding to the DBV of the display screen is 300 nits, and in this example, after adjusting the DBV, the maximum brightness corresponding to the DBV of the display screen is 150 nits, and the second correspondence is The relationship curve of is shown in FIG. 3, and, in this example, the second gray level of the second pixel is 61. In this case, based on the first correspondence shown in FIG. 3, it can be determined that the second brightness corresponding to the second gray scale is 31 nits. Then, according to the first correspondence shown in FIG. 2, it can be determined that the second brightness is at all The corresponding third gray level in the first corresponding relationship is 32. That is, the second brightness is 31 nits, the second gray scale corresponding to the second brightness in the second corresponding relationship is 61, and the third gray scale corresponding to the second brightness in the first corresponding relationship is 32.

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

Wherein, the first gain value can be obtained in a variety of ways.

In one of the methods for obtaining the first gain value, the first gain value may be the ratio of the third gray scale to the second gray scale, that is, the third gray scale and the second gray scale are determined The ratio of is 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 determine the ratio of the third gray level to the second gray level; then, in a preset first mapping relationship, determine the first The gain value corresponding to the ratio of the three gray scales to the second gray scale is the first gain value, and the preset first mapping relationship is a mapping relationship between different ratios and corresponding gain values. That is, the first gain value is a gain value corresponding to the ratio of the third gray scale to the second gray scale in the preset first mapping relationship.

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

In addition, in the embodiment of the present application, the product of the first gain value and the third gray scale is the first target gray scale. For example, in the above example, the second brightness is 31 nits, and the second brightness is at The corresponding second gray scale in the second correspondence relationship is 61, and the corresponding third gray scale in the first correspondence relationship is 32, and the first gain value is 32/61, then the first target gray scale It is 32/61*32.

Step S23: Determine a third brightness corresponding to the first target gray scale in the first correspondence relationship, and determine that the third brightness is the target brightness of the second pixel.

Through the above steps, the terminal device 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, so that the demura process can be implemented according to the target brightness.

In addition, when determining the third brightness corresponding to the first target gray scale in the first correspondence relationship, it can be implemented in a variety of ways.

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

In this case, after the first target gray level is determined, the third brightness can be calculated through the stored first correspondence relationship.

In this way, the third brightness can be calculated, so that demura processing can be performed through the third brightness, and the mura area in the display screen can be eliminated. Moreover, in this manner, the third brightness is determined by real-time calculation of the first correspondence relationship, and the accuracy of the determined third brightness is relatively high.

Or, in another feasible implementation manner, the first correspondence relationship includes m gray levels and m brightnesses respectively corresponding to the m gray levels, and m is a positive integer.

In this case, the correspondence relationship between the m gray levels and the m brightness can be stored. Moreover, in this solution, the target brightness of the pixel is determined according to the m gray scales and the m brightnesses corresponding to the m gray scales, respectively.

In a feasible design, m can be determined to be 3, that is, to determine the 3 brightnesses corresponding to the 3 gray levels in the first correspondence relationship.

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

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

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 correspondence relationship.

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

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

In addition, when the first target gray scale does not belong to the m gray scales, the third brightness is obtained after interpolation processing is performed on the m gray scales and the m brightnesses corresponding to the m gray scales. The determined brightness.

When performing interpolation processing on the m gray scales and the brightness corresponding to the m gray scales, usually the adjacent gray scales of the first target gray scale among the m gray scales, and the The adjacent gray levels are interpolated at the brightness corresponding to the first corresponding relationship.

Exemplarily, the m gray levels are respectively 32, 64, and 192, and the first target gray level is 50, and the adjacent gray levels of the first target gray level are 32 and 64. In the embodiment of the present application, the brightness corresponding to 32 and 32 in the first correspondence relationship, and the brightness corresponding to 64 and 64 in the first correspondence relationship can be interpolated, and the interpolation processing can determine that 50 is in the first correspondence. The corresponding brightness in the relationship.

In addition, before the DBV adjustment and after the DBV adjustment, the brightness of pixels with a gray scale of 0 in the display screen are all 0nits. When the first target gray scale does not belong to the m gray scales, and the first target gray scale is less than the smallest gray scale among the m gray scales, the adjacent gray scale of the first target gray scale is 0 The gray scale and the smallest gray scale among the m gray scales can depend on the brightness corresponding to the zero gray scale in the first corresponding relationship (ie, 0nits), and the smallest gray scale among the m gray scales is in the first corresponding relationship. Interpolation processing of the corresponding brightness in a correspondence relationship determines the brightness corresponding to the first target gray scale.

In this case, in the above example, if the first target gray level is 20, then the first target gray level is less than the smallest gray level among the three gray levels, and the phase of the first target gray level is The adjacent gray levels are 0 and 32. Through interpolation processing of the brightness corresponding to 0 and 32, and 0 and 32 respectively in the first correspondence relationship, the third brightness corresponding to the first correspondence relationship 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 levels and the m luminances corresponding to the m gray levels, multiple types of interpolation processing methods can be used. This is not limited. Exemplarily, the interpolation method used in the embodiment of the present application may be a linear interpolation method.

Further, in this solution for determining the target brightness, the terminal device only needs to store m gray levels and the m brightnesses corresponding to the m gray levels in the first correspondence relationship. Therefore, the storage space occupied by this method is Smaller.

Moreover, in this solution, when the first target gray scale belongs to the m gray scales, the second target gray scale can be determined according to the stored correspondence between the m gray scales and the m brightness. The target brightness of the pixel; and when the first target gray scale does not belong to the m gray scales, it can be determined by performing interpolation processing on the m gray scales and the brightness corresponding to the m gray scales respectively The target brightness of the second pixel does not need to be calculated in real time through the relationship between the gray scale and the brightness, so the amount of calculation is small, and accordingly, the efficiency of determining the target brightness of the second pixel is improved.

Or, in another feasible implementation manner, referring to the schematic diagram of the work flow shown in FIG. The corresponding target brightness includes the following steps:

Step S31: Determine 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 can be determined in a variety of ways. In one of the manners, the determining the second gain value according to the maximum brightness corresponding to the DBV before adjustment and the maximum brightness corresponding to the adjusted DBV includes: determining the maximum brightness corresponding to the adjusted DBV and The ratio of the maximum brightness corresponding to the DBV before the adjustment is the second gain value.

Alternatively, the 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 includes: determining the adjusted value in the preset second mapping relationship The gain value corresponding to the ratio of the maximum brightness corresponding to the DBV to the maximum brightness corresponding to the DBV before adjustment is the second gain value, and the preset second mapping relationship is the difference between the different ratios and the corresponding gain values Mapping relations.

That is, in this solution, the second mapping relationship is preset, and then the gain value corresponding to the ratio in the second mapping relationship is determined to be the second gain value.

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

Step S32: Determine a third gain value according to the maximum brightness corresponding to the adjusted DBV and the second gain value.

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

Wherein, the third gain value can be obtained in multiple ways. In one of the feasible implementation manners, the determining the third gain value according to the adjusted DBV and the second gain value includes:

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 adjusted DBV.

In the above formula, MinDBV is the maximum brightness corresponding to the minimum DBV of the display screen, where the maximum brightness corresponding to MinDBV is usually 0nits; in addition, in the examples corresponding to Figures 2 and 3, the maximum DBV of the display screen corresponds to The maximum brightness of is usually 300nits. In this example, the maximum brightness corresponding to MaxDBV is 300nits; when the maximum brightness corresponding to DBV of the display screen is adjusted to 150nits, the maximum brightness corresponding to CurrentDBV is 150nits. In this case, if EndPointGain is 1, then Gain1 is 2.

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

Step S33: Determine that the product of the gray scale of the third pixel in the mura area and the third gain value is the second target gray scale.

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

In the embodiment of the present application, the product of the gray scale of the third pixel and the third gain value is the second target gray scale. For example, the gray scale of the third pixel is 32, and the third gain value is 2. , The second target gray level is 64.

Step S34: Determine the fourth brightness corresponding to the second target gray scale in the first correspondence relationship.

Step S35: Determine that the fourth brightness is the target brightness of the third pixel.

Through the above steps, the terminal device 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.

Wherein, in the embodiment of the present application, the fourth brightness corresponding to the second target gray scale before the DBV adjustment is used as the target brightness. In this case, the terminal device may store the first corresponding relationship, and after determining the second target gray scale, the brightness corresponding to the second target gray scale in the first corresponding relationship is the fourth brightness , That is, the fourth brightness can be determined through the first corresponding relationship stored in the terminal device.

In a feasible design, the terminal device can store the first correspondence relationship by storing the relationship expression of the first correspondence relationship. Exemplarily, when the first corresponding relationship is: (pixel brightness/maximum brightness corresponding to DBV before adjustment)=(pixel grayscale/maximum grayscale of the display screen) ^g1 , the terminal device may store The relationship. In this case, the fourth brightness can be calculated through the relational expression.

In this way, the fourth brightness can be calculated, so that demura processing can be performed through the fourth brightness, and the mura area in the display screen can be eliminated. Moreover, in this manner, the fourth brightness is determined by real-time calculation of the first correspondence relationship, and the accuracy of the determined fourth brightness is relatively high.

Or, in another feasible implementation manner, the first correspondence relationship includes r gray levels and r brightnesses respectively corresponding to the r gray levels, and r is a positive integer.

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

In a feasible design, r can be determined to be 3, that is, to determine the three brightnesses corresponding to the three gray levels in the first corresponding relationship.

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

Correspondingly, the determining the fourth brightness corresponding to the second target gray scale in the first correspondence 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 correspondence;

When the second target gray scale does not belong to the r gray scales, the fourth brightness is obtained by performing interpolation processing on the r gray scales and the r brightnesses corresponding to the r gray scales. Determine the brightness.

When performing interpolation processing on the r gray scales and the brightness corresponding to the r gray scales, usually among the r gray scales, the adjacent gray scales of the second target gray scale, and the The adjacent gray levels are interpolated at the brightness corresponding to the first corresponding relationship.

When the second target gray scale is less than the smallest gray scale among the r gray scales, the adjacent gray scale of the second target gray scale is 0 gray scale and the smallest gray scale among the r gray scales, The fourth brightness may be determined by interpolation processing on the brightness corresponding to the zero gray scale in the first correspondence relationship, and the brightness corresponding to the smallest gray scale among the r gray scales in the first correspondence relationship.

In addition, in the embodiment of the present application, when performing interpolation processing on the r grayscales and the r luminances corresponding to the r grayscales, multiple types of interpolation processing methods can be used. This is not limited. Exemplarily, the interpolation method used in the embodiment of the present application may be a linear interpolation method.

Further, in this solution for determining the target brightness, the terminal device only needs to store r gray levels, and the r gray levels corresponding to the r brightness in the first correspondence relationship. Therefore, the storage space occupied by this method is Smaller.

Moreover, in this solution, there is no need to perform real-time calculation through the relationship between the brightness and the gray scale, and the amount of calculation is small. Accordingly, the efficiency of determining the target brightness of the third pixel is improved.

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

The maximum gray scale supported by the display screen is often set by default at the factory. When the second target gray scale is greater than the maximum gray scale supported by the display screen, there is no such thing in the first corresponding relationship. For the brightness corresponding to the second target gray scale, in this case, it can be determined that after the DBV adjustment, the maximum brightness that can be displayed on the display screen is the fourth brightness.

Exemplarily, 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 this case, the second target gray scale is 384, which exceeds The maximum gray scale of the display screen. In this case, it can be determined that the fourth brightness is the maximum brightness that the display screen can display after the DBV adjustment. If after the DBV adjustment, the maximum brightness that the display screen can display is 150 nits, then the fourth brightness is 150 nits.

The following are device embodiments of this application, which can be used to implement the method embodiments of this application. For details that are not disclosed in the device embodiments of this application, please refer to the method embodiments of this application.

Corresponding to the foregoing method embodiment, an embodiment of the present application discloses a brightness adjustment device for a display screen. Referring to the structural schematic diagram shown in FIG. 6, the display brightness adjustment device includes a processing unit 110 and a brightness adjustment unit 120.

The processing unit 110 is configured to determine, according to the first correspondence, the second correspondence 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. A corresponding relationship is the corresponding relationship between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted;

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

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

With the device disclosed in the embodiments of the present application, the first corresponding relationship between the brightness and gray scale of each pixel before the DBV adjustment can be used to determine the brightness and gray scale of each pixel in the non-mura area of the display screen after the DBV is adjusted. In the second correspondence between the two, the second correspondence is used to compensate the brightness of the pixels in the mura area, that is, the target brightness of the pixels in the mura area that needs to be adjusted is determined through the second correspondence.

After adjusting the DBV, the corresponding relationship between the gray scale and the brightness of each pixel in the display screen is more in line with the second corresponding relationship. Therefore, compared with the solution in the prior art, the solution of the embodiment of the present application can improve the accuracy of the demura processing and reduce the compensation error of the brightness compensation for the pixels in the mura area.

Wherein, in the device disclosed in the embodiment of the present application, the first correspondence is specifically used to indicate the brightness of each pixel in the display screen, the DBV before adjustment, and the value of each pixel in the display screen before the DBV adjustment. Gray level, the corresponding relationship between the maximum gray level of the display screen and the first gamma value;

The second correspondence is specifically used to indicate that after the DBV adjustment, 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 Correspondence between the second gamma values.

Further, in the device disclosed in the embodiment of the present application, the processing unit is specifically configured to: determine the second gamma value in the second correspondence relationship according to the first gamma value in the first correspondence relationship , The difference between the first gamma value and the second gamma value is within a preset range;

Wherein, in a feasible solution, the first corresponding relationship is: (brightness of the pixel/maximum brightness corresponding to the DBV before adjustment)=(grayscale of the pixel/maximum grayscale of the display screen) ^g1 ;

The second corresponding relationship is: (brightness of the pixel/maximum brightness corresponding to the adjusted DBV)=(gray scale of the pixel/maximum gray scale of the display screen) ^g2 ;

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

In a feasible implementation manner, the processing unit is specifically configured to determine the respective brightness of each pixel in the mura area in the second correspondence relationship, and the gray scale of each pixel is The respective brightness in the second correspondence relationship is the target brightness corresponding to each pixel.

In this case, the processing unit is specifically configured to: when the first gray level of the first pixel in the mura area belongs to the n gray levels, determine that the first gray level is in the second corresponding The corresponding brightness in the relationship is the target brightness of the first pixel, and the first pixel is any pixel in the mura area;

Or, in another feasible implementation manner, the processing unit is specifically configured to: determine the second brightness corresponding to the second gray scale of the second pixel in the mura area in the second correspondence, and The second pixel is any pixel in the mura area;

Determine a third gray scale corresponding to the second brightness in the first correspondence relationship;

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

Determining a third brightness corresponding to the first target gray scale in the first correspondence relationship;

It is determined that the third brightness is the target brightness of the second pixel.

In this case, the first correspondence relationship includes m gray levels and m brightnesses respectively corresponding to the m gray levels, and m is a positive integer;

The processing unit is specifically configured to: when the first target gray scale belongs to the m gray scales, determine that the third brightness is the brightness corresponding to the first target gray scale in the first corresponding relationship;

When the first target gray scale does not belong to the m gray scales, it is determined that the third brightness is obtained by performing interpolation processing on the m gray scales and the m brightnesses corresponding to the m gray scales. Determine the brightness.

In addition, in this implementation manner, the processing unit is specifically configured to: determine that the ratio of the third gray level to the second gray level is the first gain value;

Or, the processing unit is specifically configured to determine the ratio of the third gray level to the second gray level;

In the preset first mapping relationship, it is determined that the gain value corresponding to the ratio of the third gray scale to the second gray scale is the first gain value, and the preset first mapping relationship is The mapping relationship between different ratios and corresponding gain values.

Or, in another feasible implementation manner, the processing unit is specifically configured to: determine 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;

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

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

Determining the fourth brightness corresponding to the second target gray level in the first correspondence relationship;

It is determined that the fourth brightness is the target brightness of the third pixel.

Wherein, the first correspondence relationship includes r gray levels and r brightnesses respectively corresponding to the r gray levels, 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, determine that the fourth brightness is the brightness corresponding to the second target gray scale in the first correspondence relationship ；

When the second target gray scale does not belong to the r gray scales, it is determined that the fourth brightness is obtained by performing interpolation processing on the r gray scales and the r brightnesses corresponding to the r gray scales. The determined brightness.

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

In this manner, the processing unit is specifically configured to determine that the 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 processing unit is specifically configured to, in a preset second mapping relationship, determine that the gain value corresponding to the ratio of the maximum brightness corresponding to the adjusted DBV to the maximum brightness corresponding to the DBV before adjustment is For the second gain value, 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;

Where, 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. brightness.

Corresponding to the method embodiment of the present application, the embodiment of the present application also discloses a device for adjusting the brightness of a display screen. Referring to the schematic structural diagram shown in FIG. 7, the terminal device 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 FIGS. 1, 4, and 4 All or part of the steps in the embodiment corresponding to FIG. 5 realize the adjustment of the brightness of the display screen.

Further, the display brightness adjustment device disclosed in the embodiment of the present application further includes a memory. The memory is usually used to store the first correspondence and the second correspondence. Wherein, the first correspondence is specifically used to indicate that before the DBV adjustment, 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, and the display The corresponding relationship between the maximum gray scale of the screen and the first gamma value; the second corresponding relationship is specifically used to indicate the brightness of each pixel in the display screen after the DBV adjustment, and the maximum brightness corresponding to the adjusted DBV The corresponding relationship between the gray scale of each pixel in the display screen, the maximum gray scale of the display screen and the second gamma value.

In the process of adjusting the brightness of the display screen, the processor 101 may adjust the brightness of the display screen by reading the first correspondence and the second correspondence stored in the memory.

Further, the device for adjusting the brightness of the display screen may further include a bus 1103. In addition, the memory may include a random access memory 1104 and a read-only memory 1105.

Among them, the processor is respectively coupled to the receiver/transmitter, the random access memory and the read-only memory through the bus. When the terminal device needs to be operated, the basic input output system solidified in the read-only memory or the bootloader in the embedded system is used to guide the system to start, and the device is guided to enter the normal operating state. After the device enters the normal operating state, the application program and the operating system are run in the random access memory, so that the terminal device executes all or part of the steps in the embodiments corresponding to FIG. 1, FIG. 4, and FIG. 5.

The device in the embodiment of the present invention may correspond to the display brightness adjustment device in the embodiment corresponding to FIG. 6, and the processor in the device can implement the functions of the device in the embodiment corresponding to FIG. 6 And/or the various steps and methods implemented are not repeated here for brevity.

Correspondingly, the embodiment of the present application also discloses a brightness adjustment device of the display screen. Referring to the system schematic diagram shown in FIG. 8, the display brightness adjustment device includes: a display driver integrated circuit (DDIC) 100 and an application processor (AP) 200.

Wherein, the AP is used to determine the adjusted display brightness value DBV, and according to the first corresponding relationship, determine the difference between the brightness and gray scale of each pixel in the non-mura area of the display screen after the display brightness value DBV is adjusted. A second correspondence relationship, where the first correspondence relationship is the correspondence relationship between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted;

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

Wherein, when the AP determines the target brightness corresponding to each pixel in the mura area of the display screen after adjusting the DBV according to the second correspondence relationship, various methods may be adopted.

In one of the feasible methods, the AP may determine the brightness of each pixel in the mura area in the second correspondence relationship, and the gray scale of each pixel is in the second correspondence. The respective brightness in the correspondence relationship is the target brightness corresponding to each pixel.

Or, in another feasible method, the second correspondence relationship includes n gray levels and n brightnesses corresponding to the n gray levels, and n is a positive integer. Correspondence. In this case, when the AP determines the target brightness corresponding to each pixel in the mura area of the display screen after adjusting the DBV, the following operations are adopted:

When the first gray scale of the first pixel in the mura area belongs to the n gray scales, it is determined that the brightness corresponding to the first gray scale in the second correspondence relationship is the target of the first pixel Brightness, the first pixel is any pixel in the mura area;

Or, in another feasible method, when the AP determines the target brightness corresponding to each pixel in the mura area of the display screen after adjusting the DBV, the following operation is adopted:

Determining the second brightness corresponding to the second gray scale of the second pixel in the mura area in the second correspondence, and the second pixel is any pixel in the mura area;

In this case, when the first correspondence relationship includes m gray levels and m brightnesses corresponding to the m gray levels, and m is a positive integer, the AP determines the first The third brightness corresponding to the target gray scale in the first corresponding relationship:

When the first target gray scale belongs to the m gray scales, determining that the third brightness is the brightness corresponding to the first target gray scale in the first corresponding relationship;

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;

Wherein, when the first correspondence relationship includes r gray levels and r brightnesses corresponding to the r gray levels, and r is a positive integer, the AP determines that the second target gray level is at the The operation of the corresponding fourth brightness in the first corresponding relationship includes the following steps:

When the second target gray scale belongs to the r gray scales, determining that the fourth brightness is the brightness corresponding to the second target gray scale in the first correspondence relationship;

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

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

Alternatively, the memory stores s gray levels and the s gray levels corresponding to the s brightness in the first correspondence relationship; or, the memory stores t gray levels and the t gray levels. T brightness levels corresponding to each in the first correspondence relationship. Among them, s and t are both positive integers.

In this case, the AP can 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 present application also discloses a device for adjusting the brightness of the display screen. The display brightness adjustment device includes: DDIC and AP.

Wherein, the AP is used to determine the adjusted DBV. In addition, the AP is also used to transmit the determined adjusted DBV to the DDIC.

The DDIC is used to determine, according to the first correspondence, the second correspondence between the brightness and the gray scale of each pixel in the non-mura area in the display screen after the DBV is adjusted. The first correspondence is that the DBV is being adjusted. Previously, the corresponding relationship between the brightness of each pixel of the display screen and the gray scale, and then according to the second corresponding relationship, determine the target corresponding to each pixel in the mura area of the display screen after the DBV is adjusted Brightness; and, the DDIC is also used to adjust the brightness of each pixel in the mura area to the target brightness corresponding to each pixel.

When the DDIC determines the target brightness corresponding to each pixel in the mura area of the display screen after adjusting the DBV according to the second correspondence relationship, various methods may be adopted.

Wherein, the DDIC and the method used to determine the respective target brightness of each pixel in the mura area of the display screen after adjusting the DBV can refer to the foregoing embodiments, and will not be repeated here.

Correspondingly, the embodiment of the present application also discloses a brightness adjustment device of the display screen. The display brightness adjustment device includes: DDIC and AP.

Wherein, the AP is used to determine the adjusted DBV.

In addition, 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 feasible implementation manner, after determining the adjusted DBV, the AP may also determine, according to the first corresponding relationship, that after the DBV is adjusted, the brightness and gray scale of each pixel in the non-mura area of the display screen The first corresponding relationship is the corresponding relationship between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted.

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 correspondence relationship; and the DDIC is also used to set the mura area The brightness of each pixel of is adjusted to the target brightness corresponding to each of the pixels.

Or, in another feasible implementation manner, the AP and the DDIC jointly determine the second correspondence between the brightness and the gray scale of each pixel in the non-mura area in the display screen after the DBV is adjusted, and According to the second correspondence, the target brightness corresponding to each pixel in the mura area of the display screen is determined 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 solution, the AP, or the DDIC and the AP jointly determine the target brightness of each pixel in the mura area of the display screen after adjusting the DBV. Refer to The foregoing various embodiments will not be repeated here.

In specific implementation, an embodiment of the present application also provides a computer-readable storage medium, where the computer-readable storage medium is used to store instructions. Wherein, when the instructions run on a computer or a processor, the computer or the processor can implement all or part of the steps in the embodiments corresponding to FIG. 1, FIG. 4, and FIG. 5. The storage medium of the computer readable medium may be a magnetic disk, an optical disc, a read-only memory (English: read-only memory, abbreviated as: ROM) or a random access memory (English: random access memory, abbreviated as: RAM), etc. .

In addition, another embodiment of the present application also provides a computer program product containing instructions. When the computer program product runs on an electronic device, the electronic device can implement the corresponding instructions including those shown in FIG. 1, FIG. 4, and FIG. 5. All or part of the steps in the embodiment.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solutions in the embodiments of the present invention can be embodied in the form of software products, which can be stored in a storage medium, such as ROM/RAM. , Magnetic disks, optical disks, etc., including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute the methods described in the various embodiments or some parts of the embodiments of the present invention.

The embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention.

Claims

A method for adjusting the brightness of a display screen is characterized in that it comprises:

According to the first correspondence, it is determined that after the display brightness value DBV is adjusted, the second correspondence between the brightness and the gray scale of each pixel in the non-mura area of the display screen is determined, and the first correspondence is that before the DBV is adjusted, The corresponding relationship between the brightness of each pixel of the display screen and the gray scale;

Determine, according to the second correspondence, the target brightness corresponding to each pixel in the mura area of the display screen after the DBV is adjusted;

The brightness of each pixel in the mura area is adjusted to the target brightness corresponding to each pixel.
The method of claim 1, wherein:

The first corresponding relationship is specifically used to indicate that before the DBV adjustment, 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 Correspondence between the first gamma values;

The second correspondence is specifically used to indicate that after the DBV adjustment, 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 Correspondence between the second gamma values.
The method according to claim 2, characterized in that, according to the first correspondence, it is determined that after adjusting the display brightness value DBV, the second difference between the brightness and the gray scale of each pixel in the non-mura area in the display screen is determined. Correspondence, including:

According to the first gamma value in the first correspondence relationship, the second gamma value in the second correspondence relationship is determined, and the difference between the first gamma value and the second gamma value is in advance. Set within

Determine the second correspondence relationship according to the second gamma value and the adjusted DBV.
The method according to claim 2 or 3, wherein:

The first corresponding relationship is: (brightness of the pixel/maximum brightness corresponding to the DBV before adjustment)=(gray scale of the pixel/maximum gray scale of the display screen) g1 ;

The second corresponding relationship is: (brightness of the pixel/maximum brightness corresponding to the adjusted DBV)=(gray scale of the pixel/maximum gray scale of the 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 target brightness corresponding to each pixel in the mura area of the display screen is determined after the DBV is adjusted according to the second correspondence relationship. ,include:

Determine the respective brightness of the gray scale of each pixel in the mura area in the second correspondence relationship, and the respective brightness of the gray scale of each pixel in the second correspondence relationship is the respective brightness of each pixel The corresponding target brightness.
The method according to any one of claims 1 to 4, wherein the second correspondence relationship includes n gray levels and n brightnesses respectively corresponding to the n gray levels, and n is a positive integer, The determining, according to the second correspondence relationship, the target brightness corresponding to each pixel in the 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, it is determined that the brightness corresponding to the first gray scale in the second correspondence relationship is the target of the first pixel Brightness, the first pixel is any 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, by performing interpolation processing on the n gray scales and the n luminances corresponding to the n gray scales, The first brightness corresponding to the first gray scale is determined, where the first brightness is the target brightness of the first pixel.
The method according to any one of claims 1 to 4, wherein, according to the second correspondence, it is determined that after the DBV is adjusted, the target brightness corresponding to each pixel in the mura area of the display screen is determined. ,include:

Determining the second brightness corresponding to the second gray scale of the second pixel in the mura area in the second correspondence, and the second pixel is any pixel in the mura area;

Determine a third gray scale corresponding to the second brightness in the first correspondence relationship;

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

Determining a third brightness corresponding to the first target gray scale in the first correspondence relationship;

It is determined that the third brightness is the target brightness of the second pixel.
8. The method of claim 7, wherein the determining the first gain value according to the second gray scale and the third gray scale comprises:

Determining that the ratio of the third gray level to the second gray level is the first gain value;

or,

Determining the ratio of the third gray level to the second gray level;

In the preset first mapping relationship, it is determined that the gain value corresponding to the ratio of the third gray scale to the second gray scale is the first gain value, and the preset first mapping relationship is The mapping relationship between different ratios and corresponding gain values.
The method according to any one of claims 1 to 4, wherein, according to the second correspondence, it is determined that after the DBV is adjusted, the target brightness corresponding to each pixel in the mura area of the display screen is determined. ,include:

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;

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

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

Determining the fourth brightness corresponding to the second target gray level in the first correspondence relationship;

It is determined that the fourth brightness is the target brightness of the third pixel.
The method according to claim 9, wherein when the second target gray level is greater than the gray level of the display screen, the determining that the second target gray level corresponds to the first corresponding relationship The fourth brightness includes:

It is determined that after the DBV adjustment, the maximum brightness that can be displayed on the display screen is the fourth brightness.
The method according to claim 9 or 10, wherein the 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 that the ratio of the maximum brightness corresponding to the DBV after the adjustment to the maximum brightness corresponding to the DBV before the adjustment is the second gain value;

or,

In the preset second mapping relationship, it is determined that the gain value corresponding to the ratio of the maximum brightness corresponding to the adjusted DBV to the maximum brightness corresponding to the DBV before adjustment is the second gain value, and the preset The predetermined second mapping relationship is the mapping relationship between different ratios and corresponding gain values.
The method according to any one of claims 9 to 11, wherein the determining a third gain value according to the adjusted DBV and the second gain value comprises:

Determine the third gain value by the following formula:

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

Where, 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. brightness.
A device for adjusting the brightness of a display screen is characterized in that it comprises:

The processing unit is configured to determine, according to the first correspondence, a second correspondence 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, and the first correspondence is Before adjusting the DBV, the corresponding relationship between the brightness of each pixel of the display screen and the gray scale;

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

The brightness adjustment unit is configured to adjust the brightness of each pixel in the mura area to a target brightness corresponding to each pixel.
The device according to claim 13, wherein:

The first corresponding relationship is specifically used to indicate that before the DBV adjustment, 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 Correspondence between the first gamma values;

The second correspondence is specifically used to indicate that after the DBV adjustment, 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 Correspondence between the second gamma values.
The device of claim 14, wherein:

The processing unit is specifically used for:

According to the first gamma value in the first correspondence relationship, the second gamma value in the second correspondence relationship is determined, and the difference between the first gamma value and the second gamma value is in advance. Set within

Determine the second correspondence relationship according to the second gamma value and the adjusted DBV.
The device according to claim 14 or 15, characterized in that:

The first corresponding relationship is: (brightness of the pixel/maximum brightness corresponding to the DBV before adjustment)=(gray scale of the pixel/maximum gray scale of the display screen) g1 ;

The second corresponding relationship is: (brightness of the pixel/maximum brightness corresponding to the adjusted DBV)=(gray scale of the pixel/maximum gray scale of the display screen) g2 ;

Wherein, g1 is the first gamma value, and g2 is the second gamma value.
The device according to any one of claims 13 to 16, characterized in that:

The processing unit is specifically configured to determine the respective brightness of the gray scale of each pixel in the mura area in the second correspondence relationship, and the gray scale of each pixel corresponds to each in the second correspondence relationship. The brightness of is the target brightness corresponding to each pixel.
The device according to any one of claims 13 to 16, wherein the second correspondence relationship includes n gray levels and n brightnesses respectively corresponding to the n gray levels, and n is a positive integer;

The processing unit is specifically used for:

When the first gray scale of the first pixel in the mura area belongs to the n gray scales, it is determined that the brightness corresponding to the first gray scale in the second correspondence relationship is the target of the first pixel Brightness, the first pixel is any 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, by performing interpolation processing on the n gray scales and the n luminances corresponding to the n gray scales, The first brightness corresponding to the first gray scale is determined, where the first brightness is the target brightness of the first pixel.
The device according to any one of claims 13 to 16, characterized in that:

The processing unit is specifically used for:

Determining the second brightness corresponding to the second gray scale of the second pixel in the mura area in the second correspondence, and the second pixel is any pixel in the mura area;

Determine a third gray scale corresponding to the second brightness in the first correspondence relationship;

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

Determining a third brightness corresponding to the first target gray scale in the first correspondence relationship;

It is determined that the third brightness is the target brightness of the second pixel.
The device of claim 19, wherein:

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

or,

The processing unit is specifically used for:

Determining the ratio of the third gray level to the second gray level;

In the preset first mapping relationship, it is determined that the gain value corresponding to the ratio of the third gray scale to the second gray scale is the first gain value, and the preset first mapping relationship is The mapping relationship between different ratios and corresponding gain values.
The device according to any one of claims 13 to 16, characterized in that:

The processing unit is specifically used for:

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;

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

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

Determining the fourth brightness corresponding to the second target gray level in the first correspondence relationship;

It is determined that the fourth brightness is the target brightness of the third pixel.
The device according to 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 after the DBV adjustment, the display screen can The maximum brightness displayed is the fourth brightness.
The device according to claim 21 or 22, wherein:

The processing unit is specifically configured to determine that the 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;

or,

The processing unit is specifically configured to, in the preset second mapping relationship, determine that the gain value corresponding to the ratio of the maximum brightness corresponding to the adjusted DBV to the maximum brightness corresponding to the DBV before adjustment is the first Two gain values, the preset second mapping relationship is a mapping relationship between different ratios and corresponding gain values.
The device according to any one of claims 21 to 23, characterized in that:

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

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

Where, 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. brightness.
A device for adjusting the brightness of a display screen, wherein the device includes a processor and a transmission interface, and the processor is configured to call a program instruction stored in a memory to execute any one of claims 1 to 14 The method described.
A device for adjusting the brightness of a display screen is characterized in that it comprises:

Display driver integrated circuit DDIC and application processor AP;

The AP is used to determine the adjusted display brightness value DBV, and according to the first corresponding relationship, determine the second difference between the brightness and gray scale of each pixel in the non-mura area of the display screen after the display brightness value DBV is adjusted. Correspondence, the first correspondence is the correspondence between the brightness and the gray scale of each pixel of the display screen before the DBV is adjusted;

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

The DDIC is used to adjust the brightness of each pixel in the mura area to the target brightness corresponding to each pixel.
The device according to claim 26, further comprising: a memory;

The memory is used to store the first correspondence and the second correspondence.
A computer-readable storage medium, wherein the computer-readable storage medium is used to store instructions, and when the instructions run on a computer or a processor, the computer or the processor realizes the The method of any one of 1-12.