阅读说明：本技术 一种显示亮度调整方法及相关装置 (Display brightness adjusting method and related device ) 是由 张秀峰 于 2020-04-08 设计创作，主要内容包括：本申请公开了一种显示亮度调整方法,包括：电子装置获取亮度增益值,其中,亮度增益值小于或等于1。电子装置根据亮度增益值、显示屏的峰值亮度曲线、预设的第一平均像素级和预设的第二平均像素级,确定出第三调光曲线。电子装置获取待显示图像。电子装置计算待显示图像中的平均像素级APL。电子装置通过第三调光曲线,确定出待显示图像的平均像素级对应的实际显示亮度值。电子装置根据所述实际显示亮度值,调整所述待显示图像的显示亮度。这样,可以保证在低APL时,调低亮度对对比度的影响小,保证HDR显示的画面亮度高对比度效果。(The application discloses a display brightness adjusting method, which comprises the following steps: the electronic device obtains a brightness gain value, wherein the brightness gain value is less than or equal to 1. The electronic device determines a third dimming curve according to the brightness gain value, the peak brightness curve of the display screen, the preset first average pixel level and the preset second average pixel level. The electronic device acquires an image to be displayed. The electronics calculate the average pixel level APL in the image to be displayed. And the electronic device determines the actual display brightness value corresponding to the average pixel level of the image to be displayed through the third dimming curve. And the electronic device adjusts the display brightness of the image to be displayed according to the actual display brightness value. Therefore, the influence of dimming brightness on the contrast is small when the APL is low, and the high-contrast effect of the picture brightness of HDR display is ensured.)

1. A display brightness adjustment method is characterized by comprising the following steps:

the electronic device acquires an image to be displayed;

the electronic device calculating an average pixel level of the image to be displayed;

when the average pixel level of the image to be displayed is smaller than a first average pixel level, the electronic device determines an actual display brightness value corresponding to the average pixel level of the image to be displayed through a peak brightness curve of a display screen;

when the average pixel level of the image to be displayed is greater than the second average pixel level, the electronic device determines an actual display brightness value corresponding to the average pixel level of the image to be displayed through a first dimming curve;

when the average pixel level of the image to be displayed is between the first average pixel level and the second average pixel level, the electronic device determines an actual display brightness value corresponding to the average pixel level of the image to be displayed through a second dimming curve; wherein the peak brightness curve, the first dimming curve and the second dimming curve are different from each other; the first average pixel level is less than the second average pixel level;

and the electronic device indicates to adjust the display brightness of the image to be displayed according to the actual display brightness value.

2. The method of claim 1, wherein before the electronic device acquires an image to be displayed, the method further comprises:

the electronic device acquires a brightness gain value, wherein the brightness gain value is less than or equal to 1;

and the electronic device determines a first dimming curve according to the brightness gain value and the peak brightness curve.

3. The method of claim 1, wherein before the electronic device acquires an image to be displayed, the method further comprises:

the electronic device acquires a brightness gain value, wherein the brightness gain value is less than or equal to 1;

the electronic device determines the second dimming curve according to a preset first average pixel level, a preset second average pixel level, the brightness gain value and the peak brightness curve.

4. The method according to claim 2 or 3, wherein the obtaining of the luminance gain value by the electronic device specifically comprises:

the electronic device receives a brightness adjustment value input by a user;

and the electronic device determines the brightness gain value according to the brightness adjustment value and the brightness adjustment range.

5. The method according to claim 2 or 3, wherein the obtaining of the luminance gain value by the electronic device specifically comprises:

the electronic device detects ambient brightness;

and the electronic device determines the brightness gain value corresponding to the detected ambient brightness from the corresponding relation between the ambient brightness and the brightness gain.

6. The method according to claim 1, wherein the instructing, by the electronic device, the adjustment of the display brightness of the image to be displayed according to the actual display brightness value specifically comprises:

the electronic device determines a corresponding driving current value according to the actual display brightness value;

and the electronic device adjusts the input driving current of the display screen according to the determined driving current value indication.

7. The method of claim 1, wherein a corresponding display brightness value on the first dimming curve is less than or equal to a corresponding peak brightness value on the peak brightness curve at a same average pixel level.

8. The method of claim 1, wherein a display brightness value on the second dimming curve is inversely related to an average pixel level; a display brightness value corresponding to the first average pixel level on the second dimming curve is the same as a peak brightness value corresponding to the first average pixel level on the peak brightness curve; the display brightness value corresponding to the second average pixel level on the second dimming curve is the same as the peak brightness value corresponding to the second average pixel level on the first dimming curve.

9. The method of claim 1, wherein the display screen is a self-emissive display screen; wherein the types of the display screen include: the display screen comprises an organic light emitting diode OLED display screen, an active matrix organic light emitting diode AMOLED display screen and a quantum dot light emitting diode QLED display screen.

10. The method of claim 2, wherein the electronic device determines the first dimming curve by the formula:

Y(x)＝Gain*PLC(x)；

wherein y (x) is a luminance value corresponding to the first dimming curve when the average pixel level of the image to be displayed is x; x is the average pixel level of the image to be displayed, and x is more than 0 and less than or equal to 1; plc (x) is a corresponding peak luminance value on the peak luminance curve when the average pixel level of the image to be displayed is x; and Gain is the brightness Gain value, wherein the Gain is more than 0 and less than or equal to 1.

11. The method of claim 3, wherein the electronic device determines the second dimming curve by the formula:

F(x)＝alpha(x)*Gain*PLC(x)+(1-alpha(x))*PLC(x)；

alpha(x)＝(x-x1)/(x2-x1)；

wherein, f (x) is a corresponding brightness value on the second dimming curve when the average pixel level of the image to be displayed is x; x is the average pixel level of the image to be displayed, x is not less than x2 and not more than x1, and x2 is more than x 1; PLC (x) is the corresponding brightness value on the peak brightness curve when the average pixel level of the image to be displayed is x; gain is the brightness Gain value, wherein the Gain is more than 0 and less than or equal to 1; alpha (x) is the ratio of the difference between the average pixel level of the image to be displayed and the first average pixel level to the difference between the first average pixel level and the second average pixel level; x1 is the first average pixel level preset, and x2 is the second average pixel level preset.

12. A display brightness adjustment method is characterized by comprising the following steps:

the electronic device acquires a brightness gain value, wherein the brightness gain value is less than or equal to 1;

the electronic device determines a third dimming curve according to the brightness gain value, the peak brightness curve of the display screen, the preset first average pixel level and the preset second average pixel level;

the electronic device acquires an image to be displayed;

the electronic device calculating an average pixel level in the image to be displayed;

the electronic device determines an actual display brightness value corresponding to the average pixel level of the image to be displayed through the third dimming curve;

and the electronic device indicates to adjust the display brightness of the image to be displayed according to the actual display brightness value.

13. The method according to claim 12, wherein the electronic device determines a third dimming curve according to the brightness gain value, a peak brightness curve of the display screen, a preset first average pixel level and a preset second average pixel level, and specifically comprises:

the electronic device determines a first dimming curve according to the brightness gain value and the peak brightness curve;

the electronic device determines a second dimming curve according to the first average pixel level, the second average pixel level, the brightness gain value and the peak brightness curve;

the electronic device determines the third dimming curve according to the first dimming curve, the second dimming curve, the first average pixel level and the second average pixel level.

14. The method according to claim 12, wherein the obtaining of the brightness gain value by the electronic device specifically comprises:

the electronic device receives a brightness adjustment value input by a user;

and the electronic device determines the brightness gain value according to the brightness adjustment value and the brightness adjustment range.

15. The method according to claim 12, wherein the obtaining of the brightness gain value by the electronic device specifically comprises:

the electronic device detects ambient brightness;

and the electronic device determines the brightness gain value corresponding to the detected ambient brightness from the corresponding relation between the ambient brightness and the brightness gain.

16. The method according to claim 12, wherein the instructing, by the electronic device, the adjustment of the display brightness of the image to be displayed according to the actual display brightness value specifically comprises:

the electronic device determines a corresponding driving current value according to the actual display brightness value;

and the electronic device indicates to adjust the input driving current of the display screen according to the determined driving current value.

17. The method of claim 13, wherein a corresponding display brightness value on the first dimming curve is less than or equal to a corresponding peak brightness value on the peak brightness curve at a same average pixel level.

18. The method of claim 13, wherein a display brightness value on the second dimming curve is inversely related to an average pixel level; a display brightness value corresponding to the first average pixel level on the second dimming curve is the same as a peak brightness value corresponding to the first average pixel level on the peak brightness curve; the display brightness value corresponding to the second average pixel level on the second dimming curve is the same as the peak brightness value corresponding to the second average pixel level on the first dimming curve.

19. The method of claim 12, wherein the display screen is a self-emissive display screen; wherein the types of the display screen include: the display screen comprises an organic light emitting diode OLED display screen, an active matrix organic light emitting diode AMOLED display screen and a quantum dot light emitting diode QLED display screen.

20. The method of claim 13, wherein the electronic device determines the first dimming curve by the formula:

Y(x)＝Gain*PLC(x)；

wherein y (x) is a luminance value corresponding to the first dimming curve when the average pixel level of the image to be displayed is x; x is the average pixel level of the image to be displayed, and x is more than 0 and less than or equal to 1; plc (x) is a corresponding peak luminance value on the peak luminance curve when the average pixel level of the image to be displayed is x; and Gain is the brightness Gain value, wherein the Gain is more than 0 and less than or equal to 1.

21. The method of claim 13, wherein the electronic device determines the second dimming curve by the formula:

F(x)＝alpha(x)*Gain*PLC(x)+(1-alpha(x))*PLC(x)；

alpha(x)＝(x-x1)/(x2-x1)；

wherein, f (x) is a corresponding brightness value on the second dimming curve when the average pixel level of the image to be displayed is x; x is the average pixel level of the image to be displayed, x is not less than x2 and not more than x1, and x2 is more than x 1; PLC (x) is the corresponding brightness value on the peak brightness curve when the average pixel level of the image to be displayed is x; gain is the brightness Gain value, wherein the Gain is more than 0 and less than or equal to 1; alpha (x) is the ratio of the difference between the average pixel level of the image to be displayed and the first average pixel level to the difference between the first average pixel level and the second average pixel level; x1 is the first average pixel level preset, and x2 is the second average pixel level preset.

22. The method of claim 13, wherein the electronic device determines the third dimming curve by the formula:

L(x)＝PLC(x)，x＜x1；

L(x)＝F(x)，x1≤x≤x2；

L(x)＝Y(x)，x＞x2；

wherein l (x) is a luminance value corresponding to the third dimming curve when the average pixel level of the image to be displayed is x; PLC (x) is the corresponding brightness value on the peak brightness curve when the average pixel level of the image to be displayed is x; y (x) is a luminance value corresponding to the first dimming curve when the average pixel level of the image to be displayed is x; f (x) is a corresponding brightness value on the second dimming curve when the average pixel level of the image to be displayed is x; x is the average pixel level of the image to be displayed; x1 is the first average pixel level preset, x2 is the second average pixel level preset, x1 < x 2.

23. The method of any one of claims 1-22, wherein the electronic device is a television.

24. The method of any of claims 1-22, wherein the electronic device is an application processor.

25. A display device, comprising: one or more processors, a display screen, one or more memories; wherein the one or more memories, the display screen, and the one or more processors are coupled to the one or more processors, the one or more memories to store computer program code, the computer program code comprising computer instructions that, when executed by the one or more processors, cause the display device to perform the method of any of claims 1-24.

26. The display device of claim 25, the display device being an application processor.

27. The display device of claim 25, wherein the display device is a television.

28. A computer-readable storage medium comprising instructions that, when executed on the display device, cause the display device to perform the method of any of claims 1-24.

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a method and a related device for adjusting display brightness.

Background

Currently, with the establishment of the high-dynamic range (HDR) 10 standard, various HDR standards such as HDR10, hybrid log-gamma (HLG), Dolby Vision (Dolby Vision), and HDR10+ are successively popularized and applied. HDR display is also becoming a key feature of display devices such as televisions, displays, tablets, cell phones, etc.

The HDR display has an important index, which is peak luminance, and the highest display peak luminance agreed in the international standard is 10000 nit (nit), but due to the limitation of materials, screen manufacturing process, power supply consumption and other factors, the luminance dynamic range of the actual screen source is 0 to 4000nit, for example, the peak luminance of the currently best Liquid Crystal Display (LCD) television is about 4000nit, the peak luminance of the currently best organic light-emitting diode (OLED) television is about 1000nit, and the peak luminance of the display device such as a display, a tablet computer, a smart phone, and a mobile phone is about 1000 nit. For perfect rendering of image information, the black and white luminance requirements in the HDR standard become more stringent. The OLED has a self-luminous characteristic and does not require a backlight, so that an OLED screen can independently light any minimum display unit. The OLED may be close to a pure black state when it does not emit light, but power consumption is also increased as the lit area and brightness increase. In order to avoid excessive power consumption, the OLED screen is equipped with a corresponding peak brightness curve (PLC) at the time of factory shipment, and the peak brightness of the lighted display area is determined according to the difference of Average Pixel Levels (APL). For example, when the APL is 100%, the peak brightness of the display screen may be around 200nit, and as the APL decreases, the peak brightness may gradually increase to around 1000 nit.

In the prior art, for brightness adjustment of display screens such as an OLED screen, a dimming curve is obtained by multiplying a brightness gain value set by a user by a peak brightness curve, and the brightness gain value is less than or equal to 1. Then, the display brightness of the display screen is adjusted according to the APL in each frame of picture and the dimming curve. In this way, the display brightness of the display screen is discounted when the APL is different, the display screen contrast of the HDR video is greatly reduced, and the display effect of the HDR video is deteriorated.

Disclosure of Invention

The application provides a display brightness adjusting method and a related device, which can ensure that the influence of brightness reduction on contrast is small when APL is low, and ensure the high-contrast effect of the picture brightness of HDR display.

In a first aspect, the present application provides a method for adjusting display brightness, including: the electronic device acquires an image to be displayed. The electronic device calculates an average pixel level of the image to be displayed. And when the average pixel level of the image to be displayed is smaller than the first average pixel level, the electronic device determines the actual display brightness value corresponding to the average pixel level of the image to be displayed through the peak brightness curve of the display screen. When the average pixel level of the image to be displayed is greater than the second average pixel level, the electronic device determines an actual display brightness value corresponding to the average pixel level of the image to be displayed through a first dimming curve. And when the average pixel level of the image to be displayed is between the first average pixel level and the second average pixel level, the electronic device determines the actual display brightness value corresponding to the average pixel level of the image to be displayed through a second dimming curve. The peak brightness curve, the first dimming curve and the second dimming curve are different from each other. The first average pixel level is less than the second average pixel level. The electronic device adjusts the display brightness of the image to be displayed according to the actual display brightness value.

By the display brightness adjusting method, when the APL of the image to be displayed is in the low APL section, the display screen can display the image to be displayed by taking the peak brightness corresponding to the APL as the display brightness. And when the APL of the image to be displayed is in a high APL section, enabling the display screen to display the image to be displayed by taking the brightness value obtained by multiplying the peak brightness corresponding to the APL by the brightness gain value as the actual display brightness. When the APL of the image to be displayed is in the middle APL section, the display brightness of the display screen is transited from the peak brightness to the brightness value obtained by multiplying the peak brightness by the brightness gain value along with the increase of the APL. Therefore, the influence of the low-APL on the picture contrast can be reduced, the picture brightness high-contrast effect of HDR display is improved, and meanwhile, the picture display brightness is lower when the APL is high, so that the stimulation to the eyes of a user is reduced.

In one possible implementation, before the electronic device acquires the image to be displayed, the method further includes: the electronic device obtains a brightness gain value, wherein the brightness gain value is less than or equal to l. The electronic device determines a first dimming curve according to the brightness gain value and the peak brightness curve.

In one possible implementation, before the electronic device acquires the image to be displayed, the method further includes: the electronic device obtains a brightness gain value, wherein the brightness gain value is less than or equal to 1. The electronic device determines the second dimming curve according to a preset first average pixel level, a preset second average pixel level, the brightness gain value and the peak brightness curve.

In a possible implementation manner, the electronic device obtains a luminance gain value, and specifically includes: the electronic device receives a brightness adjustment value input by a user. The electronic device determines the brightness gain value according to the brightness adjustment value and the brightness adjustment range.

In a possible implementation manner, the electronic device obtains a luminance gain value, and specifically includes: the electronic device detects ambient brightness. The electronic device determines the brightness gain value corresponding to the detected ambient brightness from the corresponding relationship between the ambient brightness and the brightness gain.

In a possible implementation manner, the adjusting, by the electronic device, the display brightness of the image to be displayed according to the actual display brightness value specifically includes: and the electronic device determines a corresponding driving current value according to the actual display brightness value. And when the electronic device displays the image to be displayed, the input driving current of the display screen is adjusted according to the driving current value.

In one possible implementation manner, at the same average pixel level, the corresponding display brightness value on the first dimming curve is smaller than or equal to the corresponding peak brightness value on the peak brightness curve.

In one possible implementation, the display brightness value on the second dimming curve is inversely related to the average pixel level. The display brightness value corresponding to the first average pixel level on the second dimming curve is the same as the peak brightness value corresponding to the first average pixel level on the peak brightness curve. The display brightness value corresponding to the second average pixel level on the second dimming curve is the same as the peak brightness value corresponding to the second average pixel level on the first dimming curve.

In one possible implementation, the display screen is a self-luminous display screen. Wherein the types of the display screen include: the display screen comprises an organic light emitting diode OLED display screen, an active matrix organic light emitting diode AMOLED display screen and a quantum dot light emitting diode QLED display screen.

In one possible implementation, the electronic device determines the formula of the first dimming curve as follows:

Y(x)＝Gain*PLC(x)。

wherein y (x) is a luminance value corresponding to the first dimming curve when the average pixel level of the image to be displayed is x. x is the average pixel level of the image to be displayed, and x is more than 0 and less than or equal to 1. Plc (x) is the corresponding peak brightness value on the peak brightness curve when the average pixel level of the image to be displayed is x. And Gain is the brightness Gain value, wherein the Gain is more than 0 and less than or equal to 1.

In one possible implementation manner, the electronic device determines the formula of the second dimming curve as follows:

F(x)＝alpha(x)*Gain*PLC(x)+(1-alpha(x)*PLC(x)。

alpha(x)＝(x-x1)/(x2-x1)。

wherein f (x) is a luminance value corresponding to the second dimming curve when the average pixel level of the image to be displayed is x. x is the average pixel level of the image to be displayed, x is not less than x2 and not more than x1, and x2 is more than x 1. Plc (x) is the corresponding brightness value on the peak brightness curve when the average pixel level of the image to be displayed is x. And Gain is the brightness Gain value, wherein the Gain is more than 0 and less than or equal to 1.Is the ratio of the difference between the average pixel level of the image to be displayed and the first average pixel level to the difference between the first average pixel level and the second average pixel level. x1 is the first predetermined average pixel level, x2 is the preset second average pixel level.

In one possible implementation, the electronic device may be a television.

In a second aspect, the present application provides a method for adjusting display brightness, including: the electronic device obtains a brightness gain value, wherein the brightness gain value is less than or equal to 1. The electronic device determines a third dimming curve according to the brightness gain value, the peak brightness curve of the display screen, the preset first average pixel level and the preset second average pixel level. The electronic device acquires an image to be displayed. The electronic device calculates an average pixel level in the image to be displayed. And the electronic device determines an actual display brightness value corresponding to the average pixel level of the image to be displayed through the third dimming curve. The electronic device adjusts the display brightness of the image to be displayed according to the actual display brightness value.

By the display brightness adjusting method, when the APL of the image to be displayed is in the low APL section, the display screen can display the image to be displayed by taking the peak brightness corresponding to the APL as the display brightness. And when the APL of the image to be displayed is in a high APL section, enabling the display screen to display the image to be displayed by taking the brightness value obtained by multiplying the peak brightness corresponding to the APL by the brightness gain value as the actual display brightness. When the APL of the image to be displayed is in the middle APL section, the display brightness of the display screen is transited from the peak brightness to the brightness value obtained by multiplying the peak brightness by the brightness gain value along with the increase of the APL. Therefore, the influence of the low-APL on the picture contrast can be reduced, the picture brightness high-contrast effect of HDR display is improved, and meanwhile, the picture display brightness is lower when the APL is high, so that the stimulation to the eyes of a user is reduced.

In a possible implementation manner, the electronic device determines a third dimming curve according to the luminance gain value, the peak luminance curve of the display screen, the preset first average pixel level, and the preset second average pixel level, and specifically includes: the electronic device determines a first dimming curve according to the brightness gain value and the peak brightness curve. The electronic device determines a second dimming curve according to the first average pixel level, the second average pixel level, the brightness gain value and the peak brightness curve. The electronic device determines the third dimming curve according to the first dimming curve, the second dimming curve, the first average pixel level and the second average pixel level.

In a possible implementation manner, the electronic device obtains a luminance gain value, and specifically includes: the electronic device receives a brightness adjustment value input by a user. The electronic device determines the brightness gain value according to the brightness adjustment value and the brightness adjustment range.

In a possible implementation manner, the electronic device obtains a luminance gain value, and specifically includes: the electronic device detects ambient brightness. The electronic device determines the brightness gain value corresponding to the detected ambient brightness from the corresponding relationship between the ambient brightness and the brightness gain.

In a possible implementation manner, the adjusting, by the electronic device, the display brightness of the image to be displayed according to the actual display brightness value specifically includes: and the electronic device determines a corresponding driving current value according to the actual display brightness value. And when the electronic device displays the image to be displayed, the input driving current of the display screen is adjusted according to the driving current value.

In one possible implementation manner, at the same average pixel level, the corresponding display brightness value on the first dimming curve is smaller than or equal to the corresponding peak brightness value on the peak brightness curve.

In one possible implementation, the display brightness value on the second dimming curve is inversely related to the average pixel level. The display brightness value corresponding to the first average pixel level on the second dimming curve is the same as the peak brightness value corresponding to the first average pixel level on the peak brightness curve. The display brightness value corresponding to the second average pixel level on the second dimming curve is the same as the peak brightness value corresponding to the second average pixel level on the first dimming curve.

In one possible implementation, the display screen is a self-luminous display screen. Wherein the types of the display screen include: the display screen comprises an organic light emitting diode OLED display screen, an active matrix organic light emitting diode AMOLED display screen and a quantum dot light emitting diode QLED display screen.

In one possible implementation, the electronic device determines the formula of the first dimming curve as follows:

Y(x)＝Gain*PLC(x)。

wherein y (x) is a luminance value corresponding to the first dimming curve when the average pixel level of the image to be displayed is x. x is the average pixel level of the image to be displayed, and x is more than 0 and less than or equal to 1. Plc (x) is the corresponding peak brightness value on the peak brightness curve when the average pixel level of the image to be displayed is x. And Gain is the brightness Gain value, wherein the Gain is more than 0 and less than or equal to 1.

In one possible implementation manner, the electronic device determines the formula of the second dimming curve as follows:

F(x)＝alpha(x)*Gain*PLC(x)+(1-alpha(x))*PLC(x)。

alpha(x)＝(x-x1)/(x2-x1)。

wherein f (x) is a luminance value corresponding to the second dimming curve when the average pixel level of the image to be displayed is x. x is the average pixel level of the image to be displayed, x is not less than x2 and not more than x1, and x2 is more than x 1. Plc (x) is the corresponding brightness value on the peak brightness curve when the average pixel level of the image to be displayed is x. And Gain is the brightness Gain value, wherein the Gain is more than 0 and less than or equal to 1.Is the ratio of the difference between the average pixel level of the image to be displayed and the first average pixel level to the difference between the first average pixel level and the second average pixel level. x1 is the first average pixel level preset, and x2 is the second average pixel level preset.

In one possible implementation manner, the electronic device determines the formula of the third dimming curve as follows:

L(x)＝PLC(x)，x＜x1。

L(x)＝F(x)，x1≤x≤x2。

L(x)＝Y(x)，x＞x2。

wherein l (x) is a luminance value corresponding to the third dimming curve when the average pixel level of the image to be displayed is x. Plc (x) is the corresponding brightness value on the peak brightness curve when the average pixel level of the image to be displayed is x. Y (x) is a luminance value corresponding to the first dimming curve when the average pixel level of the image to be displayed is x. F (x) is the corresponding brightness value on the second dimming curve when the average pixel level of the image to be displayed is x. x is the average pixel level of the image to be displayed. x1 is the first predetermined average pixel level, x2 is the second predetermined average pixel level, and x1 < x 2.

In one possible implementation, the electronic device is a television.

In a third aspect, the present application provides a display device comprising: one or more processors, a display screen, and one or more memories. The one or more memories, the display screen coupled with the one or more processors, the one or more memories configured to store computer program code, the computer program code comprising computer instructions that, when executed by the one or more processors, cause the display apparatus to perform the display brightness adjustment method of any of the possible implementations of any of the aspects.

In one possible implementation, the display device may be an application processor.

In one possible implementation, the display device may be a television.

In a fourth aspect, the present application provides a computer storage medium including computer instructions, which, when executed on a display device, cause the display device to perform the display brightness adjustment method in any one of the possible implementations of any one of the above aspects.

In a fifth aspect, the present application provides a computer program product, which when run on a computer, causes the computer to execute the display brightness adjustment method in any one of the possible implementations of the foregoing aspect.

In a sixth aspect, the present application provides a display device comprising: one or more functional modules, configured to execute the method for adjusting brightness of a display device in any one of the possible implementations of any one of the foregoing aspects.

Drawings

Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of a peak luminance curve provided in an embodiment of the present application;

FIG. 4 is a diagram illustrating a dimming curve of a dimming method in the prior art;

fig. 5 is a schematic flowchart of a display brightness adjustment method provided in an embodiment of the present application;

fig. 6 is a schematic diagram of a dimming curve of a display brightness adjustment method according to an embodiment of the present application;

fig. 7 is a schematic diagram of a display system provided in an embodiment of the present application.

Detailed Description

The technical solution in the embodiments of the present application will be described in detail and removed with reference to the accompanying drawings. In the description of the embodiments herein, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" in the text is only an association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B may mean: three cases of a alone, a and B both, and B alone exist, and in addition, "a plurality" means two or more than two in the description of the embodiments of the present application.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of embodiments of the application, unless stated otherwise, "plurality" means two or more.

The embodiment of the application provides a display brightness adjusting method, and an electronic device can enable a display screen to display an image to be displayed by taking the peak brightness corresponding to an APL (advanced peripheral language) as the display brightness when the APL of the image to be displayed is in a low APL section. And when the APL of the image to be displayed is in a high APL section, enabling the display screen to display the image to be displayed by taking the brightness value obtained by multiplying the peak brightness corresponding to the APL by the brightness gain value as the actual display brightness. When the APL of the image to be displayed is in the middle APL section, the display brightness of the display screen is transited from the peak brightness to the brightness value obtained by multiplying the peak brightness by the brightness gain value along with the increase of the APL. Therefore, the influence of the low-APL on the picture contrast can be reduced, the picture brightness high-contrast effect of HDR display is improved, and meanwhile, the picture display brightness is lower when the APL is high, so that the stimulation to the eyes of a user is reduced.

In the embodiment of the present application, the electronic device may be a display apparatus, a display device, or the like. In the following embodiments of the present application, an electronic apparatus takes a display device as an example, and a method for adjusting display brightness provided in the embodiments of the present application is described.

A schematic structural diagram of a display device 100 provided by the present application is described below.

As shown in fig. 1, the display device 100 may include a processor 111, a memory 112, a wireless communication processing module 113, a power switch 114, a display screen 115, an audio module 116, and a speaker 117.

Among other things, processor 111 may include one or more processing units, such as: the processor 111 may include an Application Processor (AP), a modem processor, a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a memory, a video codec, a Digital Signal Processor (DSP), a baseband processor, and/or a neural-Network Processing Unit (NPU), etc. The different processing units may be separate devices or may be integrated into one or more processors.

Among the controllers may be the neural center and the command center of the display device 100. The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

A memory may also be provided in processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that have just been used or recycled by the processor 110. If the processor 110 needs to reuse the instruction or data, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 110, thereby increasing the efficiency of the system.

The memory 112 is coupled to the processor 111 for storing various software programs and/or sets of instructions. The memory 112 may be used to store computer-executable program code, which includes instructions. The processor 111 executes various functional applications of the display device 100 and data processing by executing instructions stored in the memory 112. The memory 112 may include a program storage area and a data storage area. The storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like. The storage data area may store data (such as audio data, image data to be displayed, etc.) created during use of the display apparatus 100, and the like. Further, the memory 112 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (UFS), and the like.

The wireless communication module 113 may provide solutions for wireless communication applied to the display device 100, including Wireless Local Area Networks (WLANs) (e.g., wireless fidelity (Wi-Fi) networks), bluetooth (bluetooth, BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Near Field Communication (NFC), Infrared (IR), and the like.

In some embodiments, the wireless communication processing module 113 may include a Bluetooth (BT) communication processing module 113A, WLAN communication processing module 113B. One or more of the Bluetooth (BT) communication processing modules 113A, WLAN and the communication processing modules 113B may listen to signals transmitted by other devices), such as probe requests, scan signals, etc., and may transmit response signals, such as probe responses, scan responses, etc., so that other devices may discover the display device 100 and establish wireless communication connections with other devices to communicate with other devices via one or more wireless communication technologies in bluetooth or WLAN. Among other things, the Bluetooth (BT) communication processing module 113A may provide solutions including one or more of classic Bluetooth (BR/EDR) or Bluetooth Low Energy (BLE) Bluetooth communication. The WLAN communication processing module 113B may include solutions for one or more of Wi-Fi direct, Wi-Fi LAN, or Wi-Fi softAP WLAN communications.

A power switch 114 operable to control the power supplied by the power supply to the display device 100. In some embodiments, the power switch 114 may be used to control the power supplied by an external power source to the display device 100.

In some embodiments, the display device 100 may further include a battery, a charging management module, and a power management module. The battery may be used to provide power to the display device 100. The charging management module is configured to receive a charging input from a charger. The charger may be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module may receive charging input from a wired charger via a USB interface. In some wireless charging embodiments, the charging management module may receive a wireless charging input through a wireless charging coil of the display device 100. The charging management module can charge the battery and supply power to the electronic equipment through the power management module. The power management module is used for connecting a battery, the charging management module and the processor 111. The power management module receives input from the battery and/or the charging management module to power the processor 111, the memory 112, the display 115, the wireless communication module 113, and the like. The power management module may also be used to monitor parameters such as battery capacity, battery cycle number, battery state of health (leakage, impedance), etc. In other embodiments, the power management module may also be disposed in the processor 111. In other embodiments, the power management module and the charging management module may be disposed in the same device.

And a display screen 115 for displaying images, video, etc. The display screen 115 includes a display panel. In the embodiment of the present application, the display panel is a self-luminous display panel. For example, organic light-emitting diodes (OLEDs), active-matrix organic light-emitting diodes (AMOLEDs), quantum dot light-emitting diodes (QLEDs), and the like. In some embodiments, the display device 100 may include 1 or N display screens 194, with N being a positive integer greater than 1.

In the embodiment of the present application, the display panel of the display device 100 may be exemplarily illustrated as an OLED panel.

As shown in fig. 2, the OLED panel includes a glass substrate 211, an anode 212, a hole injection layer 213, an organic light emitting layer 214, an electron transport layer 215, and a cathode 216. The glass substrate 211 is transparent and can be used to support the entire OLED panel. The anode 212 is transparent, and the anode 212 can remove electrons and increase electron holes when current flows through the anode. The hole injection layer 213 is made of organic material molecules for transporting electron holes from the anode 216. The organic light emitting layer 214 is made of an organic material for emitting light. The electron transport layer 215 is made of organic material molecules for transporting electrons from the cathode 216. When the cathode 216 is passed by an electric current, the cathode 216 injects electrons into the electron transport layer 215. When the current is driven to make the two ends of the anode 212 and the cathode 216 reach a certain voltage, the electron hole generated by the anode 212 and the electron generated by the cathode 216 are combined in the organic light emitting layer to generate light. Among them, the organic light emitting layer 214 can generate three primary colors of red, green and blue (RGB) to constitute basic colors, depending on the types of organic material molecules. In some embodiments, the organic light emitting layer 214 may generate four colors of red, green, blue, and white (RGBW), which constitute basic colors, according to the types of organic material molecules. Each light emitting unit in the OLED panel can be individually lit, and different colors of light are generated due to different molecules of organic materials of organic light emitting layers in the light emitting units.

The luminance of light emitted from the organic light emitting layer 213 depends on the properties of the light emitting material and the magnitude of the current applied to the anode 212 and the cathode 216, and the larger the current applied in both the cathode and the anode, the higher the luminance of light emitted from the organic light emitting layer 213. Therefore, each display pixel point in the OLED panel can comprise red, green and blue organic light-emitting units, and the display color of the display pixel point can be adjusted by adjusting the proportion of the injection current values of the red, green and blue light-emitting units in the display pixel point. Alternatively, each display pixel in the OLED panel may include red, green, blue, and white light emitting units. The display color of the display pixel point can be adjusted by adjusting the proportion of the injection current values of the red, green, blue and white light-emitting units in the display pixel point. When the injection currents of the red, green, blue and white light-emitting units in the display pixel point are all adjusted to be 0, the display pixel point can be displayed to be black. By adjusting the driving current of the OLED panel, the image display brightness of the OLED panel can be adjusted.

The audio module 116 may be used to convert digital audio signals into analog audio signals for output, and may also be used to convert analog audio signals into digital audio signals for input. The audio module 116 may also be used to encode and decode audio signals. In some embodiments, the audio module 116 may be disposed in the processor 11l, or some functional modules of the audio module 116 may be disposed in the processor 11 l. The audio module 116 can transmit the audio signal to the wireless communication module 113 through a bus interface (e.g., a UART interface, etc.), so as to implement the function of playing the audio signal through the bluetooth speaker.

The speaker 117 may be used to convert the audio signal transmitted by the audio module i, 6 into a sound signal.

In some embodiments, the display device 100 may also include a microphone, also referred to as a "microphone," for converting sound signals into electrical signals. When a voice control command occurs, a user can make a sound through the mouth of the user and input a sound signal into the microphone.

In some embodiments, the display device 100 may further include a wired Local Area Network (LAN) communication processing module, a High Definition Multimedia Interface (HDMI) communication processing module, and a communication serial bus (USB) communication processing module. The wired LAN communication processing module is operable to communicate with other devices in one LAN through a wired LAN, and is also operable to connect to a WAN through a wired LAN, and to communicate with devices in the WAN. The HDMI communication processing module can be used for communicating with other equipment through an HDMI interface. For example, the HDMI communication processing module may receive HDR video data transmitted by the set-top box through the HDMI interface, and so on. The USB communication processing module can be used for communicating with other equipment through a USB interface.

At present, since a self-luminous screen such as an OLED may be close to a pure black state when it does not emit light, power consumption may be correspondingly increased as a lighting area and brightness increase. In order to avoid excessive power consumption, the OLED screen is equipped with a corresponding Peak Luminance Curve (PLC) at the time of factory shipment, and the peak luminance of the lighted display area is determined according to the difference of Average Pixel Levels (APLs). The average pixel level may be used to represent a ratio of an average pixel brightness of an image to be displayed to a maximum pixel brightness in the image to be displayed.

Referring to fig. 3, fig. 3 schematically shows a peak luminance curve of a display screen. As shown in fig. 3, the horizontal axis of the peak luminance curve represents the Average Pixel Level (APL), and the vertical axis represents the display luminance of the display panel. When the APL is greater than or equal to 70%, the peak luminance of the display screen is 400 nit. When the APL is equal to 10%, the peak luminance of the display area is 900 nit. When APL < ═ 3%, the peak luminance of the display panel approaches 1000 nit. When the APL is greater than 10% and less than 70%, the peak luminance of the display screen decreases as the APL increases.

In the prior art, when the actual display brightness of the display screen needs to be adjusted, the display device may multiply the peak brightness curve by the brightness gain value set by the user to obtain a dimming curve. The specific adjustment method is shown in the following formula (1):

p (x) ═ Gain plc (x) formula (1)

In the formula (1), when p (x) is the average pixel level of the image to be displayed, the display screen displays the brightness value of the image to be displayed; x is the Average Pixel Level (APL) of the image to be displayed, and x is more than 0 and less than or equal to 1; PLC (x) is the peak brightness of the display screen when the average pixel level of the image to be displayed is x; the Gain is a brightness Gain value set by a user, wherein the Gain is more than 0 and less than or equal to 1.

Referring to fig. 4, fig. 4 shows a dimming curve of the display screen. As shown in fig. 4, the brightness Gain value Gain set by the user may be 0.5, and thus, the brightness values on the dimming curve are all converted to half of the value of the peak brightness curve under the same APL. For example, the brightness Gain value Gain set by the user is 0.5, when the APL of the image to be displayed is 10%, the peak brightness value of the display screen is 900nit, and the brightness value of the image to be displayed by the display screen is 450 nit; when the APL of the image to be displayed is 70%, the peak brightness value of the display screen is 400nit, and the brightness value of the image to be displayed by the display screen is 200 nit.

It can be seen from the above that, in the brightness adjustment of the display screen in the prior art, the brightness gain value set by the user is directly multiplied by the peak value curve to obtain the dimming curve of the actual display brightness. And then, adjusting the display brightness of the display screen when the image to be displayed is displayed according to the APL of the image to be displayed and the actual display brightness curve. Therefore, the display brightness of the display screen is discounted when the APL is different, the contrast of the picture is reduced, and the playing effect of the HDR video is reduced.

Therefore, in view of the above problems, embodiments of the present application provide a display brightness adjustment method, which can enable a display screen to display an image to be displayed with a peak brightness corresponding to an APL of the image to be displayed as a display brightness when the APL is in a low APL segment. And when the APL of the image to be displayed is in a high APL section, enabling the display screen to display the image to be displayed by taking the brightness value obtained by multiplying the peak brightness corresponding to the APL by the brightness gain value as the actual display brightness. When the APL of the image to be displayed is in the middle APL section, the display brightness of the display screen is transited from the peak brightness to the brightness value obtained by multiplying the peak brightness by the brightness gain value along with the increase of the APL. Therefore, the influence of the low-APL on the picture contrast can be reduced, the picture brightness high-contrast effect of HDR display is improved, and meanwhile, the picture display brightness is lower when the APL is high, so that the stimulation to the eyes of a user is reduced.

A display brightness adjustment method provided in the embodiment of the present application is described below.

Referring to fig. 5, fig. 5 schematically illustrates a display brightness adjustment method according to an embodiment of the present disclosure. As shown in fig. 5, the method includes:

s501, the display device obtains a brightness gain value, wherein the brightness gain value is a non-negative number smaller than or equal to 1.

Wherein the brightness gain value may be user set.

For example, the display device may display a brightness adjustment bar, which may have a slider displayed thereon. The display device can receive the sliding operation of the user for the slider, and in response to the sliding operation, the display device can determine the brightness gain value according to the position of the slider on the brightness adjusting bar and the length of the brightness adjusting bar. The display device may use a ratio of a distance from a position of the slider on the brightness adjustment bar to a first end (e.g., a leftmost end) of the brightness adjustment bar to a length of the brightness adjustment bar as the brightness gain value. For example, after the user slides the slider, the slider is in the middle position of the brightness adjustment bar, and the display device may determine that the brightness gain value is 0.5.

For another example, the display device may receive a brightness adjustment value input by a user, and the display device may determine the brightness gain value according to the brightness adjustment value input by the user and a length of a brightness adjustment range, where the brightness gain value is a ratio of the brightness adjustment value to the length of the brightness adjustment range. For example, if the brightness adjustment value input by the user is 50 and the brightness adjustment range is 0-100, i.e., the length of the brightness adjustment range is 100, the brightness gain value is 0.5.

In a possible implementation manner, the display device may further determine, according to the detected ambient brightness, a brightness gain value corresponding to the detected ambient brightness from a correspondence between the ambient brightness and the brightness gain value. The display device can adjust the brightness of the display screen by using the brightness gain value corresponding to the detected ambient brightness. Wherein, the brighter the environment in which the display device is located, the larger the brightness gain value used by the display device. For example, when the ambient brightness detected by the display device is 1000lux (lux), the display device determines that the brightness gain value corresponding to the 1000lux ambient brightness is 0.8 from the corresponding relationship between the ambient brightness and the brightness gain value, and when the display device determines that the brightness gain value corresponding to the 500lux ambient brightness is 0.4 from the corresponding relationship between the ambient brightness and the brightness gain value.

S502, the display device determines a first dimming curve according to the brightness gain value and the peak brightness curve of the display screen.

The peak luminance curve is stored in the display apparatus at the time of factory shipment of the display apparatus. Under the same APL, the display brightness value of the first dimming curve is smaller than or equal to the peak brightness value on the peak curve.

The display device may multiply the peak brightness values corresponding to all APLs on the peak brightness curve by the brightness gain value to obtain the first dimming curve. The calculation formula of the first dimming curve may be as follows:

y (x) Gain plc (x) formula (2)

As shown in the formula (2), y (x) is a corresponding brightness value on the first dimming curve when the average pixel level of the image to be displayed is x; x is the average pixel level of the image to be displayed, and x is more than 0 and less than or equal to 1; PLC (x) is the peak brightness value of the display screen when the average pixel level of the image to be displayed is x; and Gain is a brightness Gain value, wherein the Gain is more than 0 and less than or equal to 1.

For example, as shown in fig. 6, when the brightness gain value is 0.5, the display brightness value of the first dimming curve is half of the peak brightness value on the peak curve at any APL. For example, when the APL is 10%, the peak luminance value on the peak luminance curve is 900nit, and the display luminance value on the first dimming curve is 450 nit. When the APL is 70%, the peak luminance value on the peak luminance curve is 400nit, and the display luminance value on the first dimming curve is 200 nit. This example is merely to illustrate the application and should not be construed as limiting.

S503, the display device determines a second dimming curve according to the first Average Pixel Level (APL), the second Average Pixel Level (APL), the brightness gain value and the peak brightness curve.

Wherein the first APL is less than the second APL. The first APL and the second APL are preset threshold values of a user or a system of the display device. The display brightness value on the second dimming curve is inversely related to the APL, that is, the display brightness value on the second dimming curve decreases as the APL increases. The display brightness value corresponding to the first APL on the second dimming curve is the same as the peak brightness value corresponding to the first APL on the peak brightness curve. The display brightness value corresponding to the second APL on the second dimming curve is the same as the peak brightness value corresponding to the first APL on the first dimming curve. When the APL of the image to be displayed is between the first APL and the second APL, the display brightness corresponding to the APL of the image to be displayed on the second dimming curve is smaller than the peak brightness value corresponding to the APL of the image to be displayed on the peak brightness curve.

In one possible implementation, the display device may determine the second dimming curve according to the first Average Pixel Level (APL), the second Average Pixel Level (APL), the brightness gain value, and the peak brightness curve by the following formula (3) and formula (4). Wherein the formula (3) and the formula (4) can be as follows:

f (x) ═ alpha (x) · Gain plc (x) +(1-alpha (x) · plc (x)) formula (3)

alpha (x) ═ x-x1)/(x2-x1) formula (4)

In the above formulas (3) and (4), f (x) is a corresponding brightness value on the second dimming curve when the average pixel level of the image to be displayed is x; x is the Average Pixel Level (APL) of an image to be displayed, x is not less than x2 and not more than x1, and x2 is more than x 1; PLC (x) is the corresponding brightness value on the peak brightness curve when the average pixel level of the image to be displayed is x; gain is a brightness Gain value, wherein the Gain is more than 0 and less than or equal to 1; alpha (x) is the ratio of the difference between the average pixel level x of the image to be displayed and the first APL to the difference between the first APL and the second APL; x1 is the first APL and x2 is the second APL.

Illustratively, as shown in fig. 6, the first APL may be 10% (i.e., 0.1), the second APL may be 70% (i.e., 0.7), and the brightness gain value is 0.5. The display device can determine a second dimming curve according to the first APL, the second APL, the brightness gain value and the peak brightness curve through the above formulas (3) and (4). When the APL of the image to be displayed is 10% (i.e., 0.1), the display luminance value on the second dimming curve is 900 nit. When the APL of the image to be displayed is 70% (i.e., 0.7), the display luminance value on the second dimming curve is 200 nit. The above examples are merely used to explain the present application, and in particular implementations, the first APL and the second APL may have other values, which are not limited herein.

In the embodiment of the present application, the above formulas (3) and (4) are only one possible implementation manner, and should not be limited. In a specific implementation, the second dimming curve may be determined according to the first Average Pixel Level (APL), the second Average Pixel Level (APL), the luminance gain value, and the peak luminance curve by using other formulas or algorithms.

And S504, the display equipment acquires an image to be displayed.

The display device may acquire the image to be displayed from the video data to be displayed, where the image to be displayed is a picture of each frame in the video data. For example, the display device is playing a segment of HDR video, and the display device may parse a next frame of picture from the HDR video data as the image to be displayed.

In one possible implementation, the image to be displayed may also be a picture that has been selected by the user. For example, in response to a detected display operation of a user on an HDR picture, the display device may acquire the HDR picture from a local or network and use the HDR picture as an image to be displayed.

And S505, the display device calculates the average pixel level APL of the image to be displayed.

The display device may convert the image to be displayed into image information (for example, RGB data) after acquiring the image to be displayed, where the image information includes a color value of each color display unit in each pixel when the display screen displays the image to be displayed. When the color values of all the color display units in the pixel are all 0, the pixel is not lightened, and the color is displayed as pure black. The display device may calculate from the image information a ratio of the average pixel luminance to the maximum pixel luminance of the image to be displayed (i.e. the APL of the image to be displayed).

Illustratively, the average pixel brightness of the image to be displayed may be 125 and the maximum pixel brightness may be 250, for example. The display device may calculate the APL of the image to be displayed to be 50%.

S506, when the APL of the image to be displayed is smaller than the first average pixel level, the display device determines the actual display brightness value of the image to be displayed according to the peak brightness curve and the APL of the image to be displayed.

Illustratively, as shown in fig. 6, for example, the first APL may be 10%, the second APL may be 70%, and the APL of the image to be displayed is 5%. Since the APL (e.g., 5%) of the image to be displayed is smaller than the first APL (e.g., 10%), the display device may determine, according to a Peak Luminance Curve (PLC), that the corresponding peak luminance value is 980nit when the APL of the image to be displayed is 5%, and use the peak luminance value 980nit as the actual display luminance value of the image to be displayed. The above examples are merely illustrative of the present application and should not be construed as limiting.

And S507, when the APL of the image to be displayed is larger than the second average pixel level, the display equipment determines the actual display brightness value of the image to be displayed according to the first dimming curve and the APL of the image to be displayed.

Illustratively, as shown in fig. 6, for example, the first APL may be 10%, the second APL may be 70%, and the APL of the image to be displayed is 80%. Since the APL (e.g., 50%) of the image to be displayed is smaller than the second APL (e.g., 70%), the display device may determine, according to the first dimming curve, that the brightness value corresponding to the APL of the image to be displayed being 80% is 200nit, and use the brightness value 200nit as the actual display brightness value of the image to be displayed. The above examples are merely illustrative of the present application and should not be construed as limiting.

And S508, when the APL of the image to be displayed is between the first average pixel level and the second average pixel level, the display equipment determines the actual display brightness value of the image to be displayed according to the second curve.

Illustratively, as shown in fig. 6, for example, the first APL may be 10%, the second APL may be 70%, and the APL of the image to be displayed is 50%. Since the APL (e.g., 50%) of the image to be displayed is between the first APL (e.g., 10%) and the second APL (e.g., 50%), the display device may determine, according to the second dimming curve, that the brightness value corresponding to the APL of the image to be displayed being 50% is 300nit, and use the brightness value 300nit as the actual display brightness value of the image to be displayed. The above examples are merely illustrative of the present application and should not be construed as limiting.

And S509, the display device displays the image to be displayed according to the actual display brightness value.

After the actual display brightness value is determined, the display device can determine a corresponding driving current value according to the actual display brightness value, and input a driving current to the display screen according to the driving current value.

In a possible implementation manner, the display device may determine the third dimming curve according to the luminance gain value, the peak luminance curve of the display screen, the preset first average pixel level, and the preset second average pixel level. First, the display device may determine a first dimming curve according to the luminance gain value and the peak luminance curve. Then, the display device determines a second dimming curve according to the first average pixel level, the second average pixel level, the brightness gain value and the peak brightness curve. And then, the display device determines a third dimming curve according to the first dimming curve, the second dimming curve, the first average pixel level and the second average pixel level. Then, after the display device calculates the average pixel level of the image to be displayed, the display device may determine the actual display brightness value according to the average pixel level of the image to be displayed and the third dimming curve.

The first dimming curve may refer to the display device, and the third dimming curve may be determined according to the first dimming curve, the second dimming curve, the first average pixel level, and the second average pixel level by using the following formula.

L(x)＝PLC(x)，x＜x1；

L(x)＝F(x)，x1≤x≤x2；

L(x)＝Y(x)，x＞x2；

Wherein, when x < x1, l (x) ═ plc (x); when x1 ≦ x2, l (x) is ≦ f (x); when x > x2, l (x) y (x). L (x) is a corresponding brightness value on the third dimming curve when the average pixel level of the image to be displayed is x; PLC (x) is the corresponding brightness value on the peak brightness curve when the average pixel level of the image to be displayed is x; y (x) is a luminance value corresponding to the first dimming curve when the average pixel level of the image to be displayed is x; f (x) is a corresponding brightness value on the second dimming curve when the average pixel level of the image to be displayed is x; x is the average pixel level of the image to be displayed; x1 is the first average pixel level, x2 is the second average pixel level, x1 < x 2.

The embodiment of the application provides a display brightness adjusting method, which can realize that when the APL of an image to be displayed is in a low APL section, a display screen displays the image to be displayed by taking the peak brightness corresponding to the APL as the display brightness. And when the APL of the image to be displayed is in a high APL section, enabling the display screen to display the image to be displayed by taking the brightness value obtained by multiplying the peak brightness corresponding to the APL by the brightness gain value as the actual display brightness. When the APL of the image to be displayed is in the middle APL section, the display brightness of the display screen is transited from the peak brightness to the brightness value obtained by multiplying the peak brightness by the brightness gain value along with the increase of the APL. Therefore, the influence of the low-APL on the picture contrast can be reduced, the picture brightness high-contrast effect of HDR display is improved, and meanwhile, the picture display brightness is lower when the APL is high, so that the stimulation to the eyes of a user is reduced.

In one possible implementation, the display device may have multiple display modes (e.g., vivid mode, standard mode, soft mode), with different display modes corresponding to different peak brightness curves. The display device may determine a peak luminance curve corresponding to the first display mode according to the set first display mode, and determine the first dimming curve according to the peak luminance curve and the luminance gain value corresponding to the first display mode. When the APL of the image to be displayed is smaller than the first APL, the display device may determine the actual display brightness value of the image to be displayed according to the peak brightness curve corresponding to the first display mode and the APL of the image to be displayed. Therefore, no matter which display mode the display equipment is in, the effect of reducing the influence of the brightness adjustment on the picture contrast can be realized when the APL is low, and the picture brightness high contrast effect of HDR display is improved.

A display system provided in an embodiment of the present application is described below.

Referring to fig. 7, fig. 7 is a schematic diagram illustrating a display system 700 provided in an embodiment of the present application. The display device 100 may include the display system 700.

As shown in fig. 7, the display system 700 may include a display panel 701 and a processing module 702. The processing module 702 may include an application processor and a display driver chip. The display panel 701 may be a self-emissive display panel, such as an OLED display panel, an AMOLED display panel, a QLED display panel, or the like.

The processing module 702 is configured to obtain a brightness gain value, where the brightness gain value is a non-negative number less than or equal to 1.

The processing module 702 may be further configured to determine a first dimming curve according to the brightness gain value and a peak brightness curve of the display screen. Wherein, the peak brightness curve is stored in the display device when the display device is shipped. Under the same APL, the display brightness value of the first dimming curve is smaller than or equal to the peak brightness value on the peak curve.

The processing module 702 may be further configured to determine a second dimming curve according to the first Average Pixel Level (APL), the second Average Pixel Level (APL), the brightness gain value, and the peak brightness curve.

Wherein the first APL is less than the second APL. The first APL and the second APL are preset threshold values of a user or a system of the display device. The display brightness value on the second dimming curve is inversely related to the APL, that is, the display brightness value on the second dimming curve decreases as the APL increases. The display brightness value corresponding to the first APL on the second dimming curve is the same as the peak brightness value corresponding to the first APL on the peak brightness curve. The display brightness value corresponding to the second APL on the second dimming curve is the same as the peak brightness value corresponding to the first APL on the first dimming curve. When the APL of the image to be displayed is between the first APL and the second APL, the display brightness corresponding to the APL of the image to be displayed on the second dimming curve is smaller than the peak brightness value corresponding to the APL of the image to be displayed on the peak brightness curve.

The processing module 702 may also be configured to obtain an image to be displayed.

The processing module 702 may also be configured to calculate an average pixel level APL of an image to be displayed.

The processing module 702 is further configured to determine an actual display brightness value of the image to be displayed according to the peak brightness curve and the APL of the image to be displayed when the APL of the image to be displayed is smaller than the first average pixel level.

The processing module 702 is further configured to determine an actual display brightness value of the image to be displayed according to the first dimming curve and the APL of the image to be displayed when the APL of the image to be displayed is greater than the second average pixel level.

The processing module 702 is further configured to determine an actual display brightness value of the image to be displayed according to the second curve when the APL of the image to be displayed is between the first average pixel level and the second average pixel level.

The processing module 702 is further configured to control the display panel 701 to display the image to be displayed according to the actual display brightness value.

In one possible implementation, the processing module 702 includes an application processor and a display driver chip. The application processor may determine a third dimming curve according to the brightness gain value, the peak brightness curve of the display screen, the preset first average pixel level, and the preset second average pixel level. First, the application processor may determine a first dimming curve according to the brightness gain value and the peak brightness curve. Then, the application processor determines a second dimming curve according to the first average pixel level, the second average pixel level, the brightness gain value and the peak brightness curve. Then, the application processor determines a third dimming curve according to the first dimming curve, the second dimming curve, the first average pixel level and the second average pixel level. Then, after calculating the average pixel level of the image to be displayed, the display driving chip may determine the actual display brightness value according to the average pixel level of the image to be displayed and the third dimming curve sent by the application processor. The display driving chip may determine a corresponding driving current value according to the actual display luminance value after determining the actual display luminance value, and determine the driving current value according to the driving current value. A driving current is input to the display panel 701.

For specific content, reference may be made to the method embodiment shown in fig. 5, which is not described herein again.

By the display system 700 provided by the embodiment of the application, when the APL of the image to be displayed is in the low APL segment, the display screen can display the image to be displayed by using the peak brightness corresponding to the APL as the display brightness. And when the APL of the image to be displayed is in a high APL section, enabling the display screen to display the image to be displayed by taking the brightness value obtained by multiplying the peak brightness corresponding to the APL by the brightness gain value as the actual display brightness. When the APL of the image to be displayed is in the middle APL section, the display brightness of the display screen is transited from the peak brightness to the brightness value obtained by multiplying the peak brightness by the brightness gain value along with the increase of the APL. Therefore, the influence of the low-APL on the picture contrast can be reduced, the picture brightness high-contrast effect of HDR display is improved, and meanwhile, the picture display brightness is lower when the APL is high, so that the stimulation to the eyes of a user is reduced.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.