Display brightness control method and device, display equipment and electronic equipment

Abstract

The invention relates to a display brightness control method and device, display equipment and electronic equipment. The method comprises the following steps: calculating an average image grade of a to-be-displayed image, wherein the average image grade of the to-be-displayed image is used for representing the overall brightness of the to-be-displayed image; determining the adjusted brightness of the to-be-displayed image based on the average image level of the to-be-displayed image under the condition that the peak brightness compensation mode is started; and displaying the to-be-displayed image based on the adjusted brightness of the to-be-displayed image. According to the embodiment of the invention, the brightness adjustment of the to-be-displayed image in the peak brightness compensation mode can be realized, so that the display brightness is improved, the dynamic contrast range is enhanced, and the display quality of the display content is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of integrated circuits, and in particular to a display brightness control method, device, display device, and electronic device. Background Art

[0002] Among various display panels, organic light emitting diode (OLED) display has the advantages of self-luminescence, ultra-lightness, fast response speed, wide viewing angle, high contrast and flexible display compared to liquid crystal display (LCD). Compared with traditional LCD, it does not require a backlight, and is made of a very thin organic material coating, a transparent substrate and a cover plate. Under the drive of an electric field, the organic material emits light through the injection and recombination of carriers, which saves energy and can achieve a very high contrast.

[0003] OLED products usually display at a preset maximum brightness in a high-brightness environment, but still cannot meet the requirements of display content visibility, resulting in less than ideal display brightness and contrast. Therefore, a new display brightness control solution is urgently needed to meet the needs of OLED products to increase the display brightness of displayed content and enhance its dynamic contrast range, thereby improving the display quality of displayed content. Summary of the invention

[0004] In view of this, the present disclosure proposes a display brightness control method, apparatus, display device and electronic device.

[0005] According to one aspect of the present disclosure, a display brightness control method is provided. The method comprises:

[0006] Calculating an average image level of the image to be displayed, where the average image level of the image to be displayed is used to characterize the overall brightness of the image to be displayed;

[0007] In case the peak brightness compensation mode is activated, determining the adjusted brightness of the image to be displayed based on the average image level of the image to be displayed;

[0008] The image to be displayed is displayed based on the adjusted brightness of the image to be displayed.

[0009] In a possible implementation, when the peak brightness compensation mode is enabled, determining the adjusted brightness of the image to be displayed based on the average image level of the image to be displayed includes:

[0010] Determining brightness control parameters corresponding to the image to be displayed according to the average image level and peak brightness curve of the image to be displayed;

[0011] Interpolation is performed according to the brightness control parameter and the gamma curve corresponding to the image to be displayed to determine the adjusted brightness of the image to be displayed; wherein the gamma curve represents the adjusted brightness corresponding to different brightness control parameters.

[0012] In a possible implementation, the peak brightness curve represents the peak brightness corresponding to different average image levels;

[0013] Determine the brightness control parameters corresponding to the image to be displayed according to the average image level and peak brightness curve of the image to be displayed, including:

[0014] Determining the peak brightness of the image to be displayed according to the average image level and the peak brightness curve of the image to be displayed;

[0015] Based on the difference between the peak brightness corresponding to the image to be displayed and the maximum brightness in the peak brightness compensation mode, a brightness control parameter corresponding to the image to be displayed is determined.

[0016] In a possible implementation, in the peak brightness curve, the peak brightness corresponding to the average image level not greater than the first preset threshold is the maximum brightness in the peak brightness compensation mode;

[0017] In the peak brightness curve, the peak brightness corresponding to the average image level equal to the second preset threshold is the maximum brightness in the highlight mode, wherein the first preset threshold is less than the second preset threshold, and the maximum brightness in the peak brightness compensation mode is greater than the maximum brightness in the highlight mode;

[0018] In the peak brightness curve, the average image level greater than the first preset threshold and less than the second preset threshold is inversely proportional to the corresponding peak brightness.

[0019] In a possible implementation, calculating the average image level of the image to be displayed includes:

[0020] Performing grayscale data conversion on the image to be displayed to obtain a grayscale image corresponding to the image to be displayed;

[0021] Based on the grayscale image corresponding to the image to be displayed, the average image level of the image to be displayed is calculated.

[0022] In a possible implementation, the gamma curve includes a first gamma curve corresponding to the peak brightness compensation mode, and the maximum value of the adjusted brightness in the first gamma curve is the maximum brightness in the peak brightness compensation mode;

[0023] Interpolating according to the brightness control parameter corresponding to the image to be displayed and the gamma curve to determine the adjusted brightness of the image to be displayed includes:

[0024] When the average image level of the image to be displayed is less than the second preset threshold, interpolation is performed according to the brightness control parameter corresponding to the image to be displayed and the first gamma curve to determine the adjusted brightness of the image to be displayed.

[0025] In a possible implementation, the gamma curve includes a second gamma curve corresponding to the highlight mode, and the maximum value of the adjusted brightness in the second gamma curve is the maximum brightness in the highlight mode;

[0026] Interpolating according to the brightness control parameter corresponding to the image to be displayed and the gamma curve to determine the adjusted brightness of the image to be displayed includes:

[0027] When the average image level of the image to be displayed is a second preset threshold, exiting the peak brightness compensation mode and starting the highlight mode;

[0028] When the highlight mode is enabled, interpolation is performed based on the pixel values ​​of the image to be displayed and the second gamma curve to determine the adjusted brightness of the image to be displayed.

[0029] According to another aspect of the present disclosure, a display brightness control device is provided. The device comprises:

[0030] A calculation module, used for calculating an average image level of the image to be displayed, where the average image level of the image to be displayed is used to characterize the overall brightness of the image to be displayed;

[0031] a determination module, configured to determine the adjusted brightness of the image to be displayed based on the average image level of the image to be displayed when the peak brightness compensation mode is activated;

[0032] The display module is used to display the image to be displayed based on the adjusted brightness of the image to be displayed.

[0033] In a possible implementation, a module is determined to:

[0034] Determining brightness control parameters corresponding to the image to be displayed according to the average image level and peak brightness curve of the image to be displayed;

[0035] Interpolation is performed according to the brightness control parameter and the gamma curve corresponding to the image to be displayed to determine the adjusted brightness of the image to be displayed; wherein the gamma curve represents the adjusted brightness corresponding to different brightness control parameters.

[0036] In a possible implementation, the peak brightness curve represents the peak brightness corresponding to different average image levels;

[0037] Determine the brightness control parameters corresponding to the image to be displayed according to the average image level and peak brightness curve of the image to be displayed, including:

[0038] Determining the peak brightness of the image to be displayed according to the average image level and the peak brightness curve of the image to be displayed;

[0039] Based on the difference between the peak brightness corresponding to the image to be displayed and the maximum brightness in the peak brightness compensation mode, a brightness control parameter corresponding to the image to be displayed is determined.

[0040] In a possible implementation, in the peak brightness curve, the peak brightness corresponding to the average image level not greater than the first preset threshold is the maximum brightness in the peak brightness compensation mode;

[0041] In the peak brightness curve, the peak brightness corresponding to the average image level equal to the second preset threshold is the maximum brightness in the highlight mode, wherein the first preset threshold is less than the second preset threshold, and the maximum brightness in the peak brightness compensation mode is greater than the maximum brightness in the highlight mode;

[0042] In the peak brightness curve, the average image level greater than the first preset threshold and less than the second preset threshold is inversely proportional to the corresponding peak brightness.

[0043] In a possible implementation, the computing module is used to:

[0044] Performing grayscale data conversion on the image to be displayed to obtain a grayscale image corresponding to the image to be displayed;

[0045] Based on the grayscale image corresponding to the image to be displayed, the average image level of the image to be displayed is calculated.

[0046] In a possible implementation, the gamma curve includes a first gamma curve corresponding to the peak brightness compensation mode, and the maximum value of the adjusted brightness in the first gamma curve is the maximum brightness in the peak brightness compensation mode;

[0047] Interpolating according to the brightness control parameter corresponding to the image to be displayed and the gamma curve to determine the adjusted brightness of the image to be displayed includes:

[0048] When the average image level of the image to be displayed is less than the second preset threshold, interpolation is performed according to the brightness control parameter corresponding to the image to be displayed and the first gamma curve to determine the adjusted brightness of the image to be displayed.

[0049] In a possible implementation, the gamma curve includes a second gamma curve corresponding to the highlight mode, and the maximum value of the adjusted brightness in the second gamma curve is the maximum brightness in the highlight mode;

[0050] Interpolating according to the brightness control parameter corresponding to the image to be displayed and the gamma curve to determine the adjusted brightness of the image to be displayed includes:

[0051] When the average image level of the image to be displayed is a second preset threshold, exiting the peak brightness compensation mode and starting the highlight mode;

[0052] When the highlight mode is enabled, interpolation is performed based on the pixel values ​​of the image to be displayed using the second gamma curve to determine the adjusted brightness of the image to be displayed.

[0053] According to another aspect of the present disclosure, a chip is provided, comprising the above-mentioned display brightness control device.

[0054] According to another aspect of the present disclosure, a display device is provided, comprising a plurality of display units and at least one of the above-mentioned display brightness control devices.

[0055] In one possible implementation, the display unit includes a display panel, and the display panel includes at least one of a liquid crystal display panel, a micro light emitting diode display panel, a light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electrowetting display panel and a small pitch display panel.

[0056] According to another aspect of the present disclosure, an electronic device is provided, comprising the above display device.

[0057] According to another aspect of the present disclosure, an electronic device is provided, comprising: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to implement the above method when executing the instructions stored in the memory.

[0058] According to another aspect of the present disclosure, a non-volatile computer-readable storage medium is provided, on which computer program instructions are stored, wherein the computer program instructions implement the above method when executed by a processor.

[0059] According to another aspect of the present disclosure, a computer program product is provided, including a computer-readable code, or a non-volatile computer-readable storage medium carrying the computer-readable code. When the computer-readable code runs in a processor of an electronic device, the processor in the electronic device executes the above method.

[0060] According to an embodiment of the present disclosure, by calculating the average image level corresponding to the image to be displayed, wherein the average image level of the image to be displayed is used to characterize the overall brightness of the image to be displayed, and when the peak brightness compensation mode is started, the adjusted brightness of the image to be displayed is determined based on the average image level of the image to be displayed. It is possible to implement brightness adjustment of the image to be displayed in the peak brightness compensation mode to improve its display brightness and enhance its dynamic contrast range. By displaying the image to be displayed based on the adjusted brightness of the image to be displayed, the display quality of the displayed content can be improved.

[0061] Further features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

[0063] Figure 1 A schematic diagram showing an application scenario according to an embodiment of the present disclosure.

[0064] Figure 2 A flow chart of a display brightness control method according to an embodiment of the present disclosure is shown.

[0065] Figure 3 A schematic diagram showing a peak brightness curve according to an embodiment of the present disclosure.

[0066] Figure 4 A schematic diagram showing a method of determining brightness control parameters corresponding to an image to be displayed according to an embodiment of the present disclosure is shown.

[0067] Figure 5 A schematic diagram showing a first gamma curve according to an embodiment of the present disclosure is shown.

[0068] Figure 6 A schematic diagram showing a gamma curve according to an embodiment of the present disclosure is shown.

[0069] Figure 7 A schematic diagram showing a second gamma curve according to an embodiment of the present disclosure is shown.

[0070] Figure 8 A schematic diagram showing the effect of turning on the PLC mode according to an embodiment of the present disclosure.

[0071] Fig. 9 A schematic diagram showing test results after the PLC mode is turned on according to an embodiment of the present disclosure.

[0072] Fig.10 A structural diagram of a display brightness control device according to an embodiment of the present disclosure is shown.

[0073] Fig.11 A block diagram of an electronic device 1900 according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0074] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0075] In the description of the present disclosure, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0076] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0077] In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0078] The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set consisting of A, B, and C.

[0079] Among various display panels, organic light emitting diode (OLED) display has the advantages of self-luminescence, ultra-lightness, fast response speed, wide viewing angle, high contrast and flexible display compared to liquid crystal display (LCD). Compared with traditional LCD, it does not require a backlight, and is made of a very thin organic material coating, a transparent substrate and a cover plate. Under the drive of the electric field, the organic material emits light through the injection and recombination of carriers, which saves energy and can achieve a very high contrast. OLED products are usually displayed at a preset maximum brightness in a high-brightness environment, but still cannot meet the requirements of the visibility of the displayed content, resulting in its display brightness and contrast being less than ideal. Therefore, a new display brightness control solution is urgently needed to meet the needs of OLED products to increase the display brightness of the displayed content and enhance its dynamic contrast range, thereby improving the display quality of the displayed content.

[0080] In view of this, the present disclosure provides a display brightness control method, device, display device and electronic device. The display brightness control method of the embodiment of the present disclosure calculates the average picture level (APL) corresponding to the image to be displayed, wherein the average picture level of the image to be displayed is used to characterize the overall brightness of the image to be displayed, and when the peak luminance compensation (PLC) mode is started, the adjusted brightness of the image to be displayed is determined based on the average picture level of the image to be displayed, so that the brightness of the image to be displayed in the PLC mode can be adjusted to improve its display brightness and enhance its dynamic contrast range. By displaying the image to be displayed based on the adjusted brightness of the image to be displayed, the display quality of the displayed content can be improved.

[0081] Figure 1 A schematic diagram showing an application scenario according to an embodiment of the present disclosure is shown. Figure 1 As shown, the display brightness control system of the present disclosure can be used in a display device, and the display device can also include an OLED display panel. In the application scenario of the present disclosure, the display device can be an OLED wearable product, and the display brightness control system of the present disclosure can adjust the brightness of the image to be displayed based on the APL of the image to be displayed when the PLC mode is started, and display the image to be displayed on the OLED display panel based on the adjusted brightness.

[0082] For example, in an outdoor high-brightness environment, an image to be displayed is usually displayed at a maximum brightness (e.g., 1000 nit) under a preset high brightness mode (HBM). The present disclosure can further increase the brightness of the image to be displayed (e.g., to 2000 nit), thereby improving the visibility of the displayed content.

[0083] Figure 2 FIG. 1 is a flow chart showing a method for controlling display brightness according to an embodiment of the present disclosure. The method can be used for display devices such as Figure 2 As shown, the method may include:

[0084] Step S201, calculating the average image level of the image to be displayed.

[0085] The image to be displayed may be a color image, which may include a plurality of pixels, and the average image level of the image to be displayed may be calculated based on the RGB (red, green, blue) pixel value of each pixel in the image to be displayed.

[0086] APL can be used to characterize the overall brightness level of an image. The higher the APL value, the greater the proportion of pixels with high brightness (such as white) in the image.

[0087] In step S201, you can:

[0088] The grayscale data of the image to be displayed is converted to obtain a grayscale image corresponding to the image to be displayed; based on the grayscale image corresponding to the image to be displayed, the average image level of the image to be displayed is calculated.

[0089] Among them, for each pixel in the image to be displayed, the pixel values ​​of the three RGB channels of the pixel can be weighted and summed according to preset weights to obtain a grayscale image corresponding to the image to be displayed. An exemplary weighted summation method can be found in the following formula:

[0090] Y=0.299*R+0.587*G+0.114*B

[0091] Among them, Y can represent the grayscale value of the corresponding pixel in the grayscale image, and R, G, and B can represent the pixel values ​​of the RGB channels of the pixel respectively.

[0092] APL is usually expressed as a percentage. After obtaining the grayscale image corresponding to the image to be displayed, the average grayscale value of each pixel in the grayscale image can be calculated, and the ratio obtained by dividing the average value by the preset maximum brightness value of the image (for example, 255) is used as the average image level of the image to be displayed. The value range of the average image level of the image to be displayed is, for example, 0% to 100%.

[0093] Step S202: when the peak brightness compensation mode is activated, determining the adjusted brightness of the image to be displayed based on the average image level of the image to be displayed.

[0094] In the present disclosure, when the average image level of the image to be displayed is less than a second preset threshold, the PLC mode can be started, and the peak brightness can be dynamically adjusted in the PLC mode. The second preset threshold is, for example, 100%.

[0095] Wherein, when the PLC mode is turned on, when the average image level of the image to be displayed is greater than the first preset threshold and less than the second preset threshold, the smaller the average image level of the image to be displayed, the higher the adjusted brightness of the image to be displayed. The first preset threshold can be adjusted as needed, for example, to 30%. Thus, the brightness of the image to be displayed can be further improved in the PLC mode.

[0096] In step S202, it is possible to:

[0097] According to the average image level and peak brightness curve of the image to be displayed, a brightness control parameter corresponding to the image to be displayed is determined.

[0098] The peak brightness curve may represent the peak brightness corresponding to different APLs, and the peak brightness may represent the expected value of the adjusted brightness.

[0099] Figure 3 FIG. 1 is a schematic diagram showing a peak brightness curve according to an embodiment of the present disclosure. Figure 3 As shown, 0 and 255 in the horizontal axis correspond to APL of 0% and 100% respectively. APL_TH indicates that APL is the first preset threshold, Curr_APL indicates the average image level of the image to be displayed, and the vertical axis (Lv) indicates the peak brightness.

[0100] In the peak brightness curve, the peak brightness corresponding to the APL not greater than the first preset threshold is the maximum brightness under the PLC mode; in the peak brightness curve, the peak brightness corresponding to the APL equal to the second preset threshold is the maximum brightness under HBM, wherein the first preset threshold is less than the second preset threshold, and the maximum brightness under the PLC mode is greater than the maximum brightness under HBM; in the peak brightness curve, the APL greater than the first preset threshold and less than the second preset threshold is inversely proportional to the corresponding peak brightness.

[0101] The maximum brightness in PLC mode can be a preset value, such as Figure 3 The example in is 2000nit. The maximum brightness under HBM can also be a preset value, such as Figure 3 The example in is 1000nit.

[0102] In the process of determining the brightness control parameter corresponding to the image to be displayed according to the average image level and the peak brightness curve of the image to be displayed, it is possible to:

[0103] According to the average image level and peak brightness curve of the image to be displayed, the peak brightness corresponding to the image to be displayed is determined; based on the difference between the peak brightness corresponding to the image to be displayed and the maximum brightness in the PLC mode, the brightness control parameter corresponding to the image to be displayed is determined.

[0104] For example, the peak brightness corresponding to the average image level of the image to be displayed in the peak brightness curve may be used as the peak brightness corresponding to the image to be displayed.

[0105] Next, the RGB pixel value corresponding to each pixel point in the image to be displayed may be adjusted based on the difference between the peak brightness corresponding to the image to be displayed and the maximum brightness in the PLC mode.

[0106] One way to adjust this can be found in Figure 4 , showing a schematic diagram of determining brightness control parameters corresponding to an image to be displayed according to an embodiment of the present disclosure. Figure 4 As shown, the abscissa (In data) and the ordinate (Out data) can respectively represent the RGB pixel values ​​before and after the adjustment, the red dotted line represents the linear mapping relationship between the RGB pixel values ​​before and after the adjustment, and the difference between the peak brightness corresponding to the image to be displayed and the maximum brightness in the PLC mode can be represented as ΔL. Based on ΔL, the slope of the original linear mapping is adjusted to obtain the adjusted linear mapping (as shown by the red solid line in the figure), and the RGB pixel values ​​corresponding to each pixel after the adjustment are determined based on the adjusted linear mapping (as shown by X' in the figure).

[0107] For each pixel in the image to be displayed, the grayscale value can be recalculated using the above formula based on the adjusted RGB pixel value corresponding to the pixel, and the brightness control parameter corresponding to the pixel can be determined based on the recalculated grayscale value. For example, the grayscale value of the pixel can be used as the brightness control parameter of the pixel.

[0108] After determining the brightness control parameters corresponding to the image to be displayed, interpolation can be performed based on the brightness control parameters corresponding to the image to be displayed and a gamma curve to determine the adjusted brightness of the image to be displayed. Specifically, the brightness control parameters corresponding to each pixel in the image to be displayed can be interpolated based on the gamma curve to determine the adjusted brightness of the image to be displayed corresponding to each pixel.

[0109] The gamma curve may be a pre-modulated exponential curve, which represents the adjusted brightness corresponding to different brightness control parameters. The relationship between the brightness control parameter (which may be the adjusted grayscale value) and the adjusted brightness may be linear or nonlinear.

[0110] The gamma curve may include a first gamma curve corresponding to the PLC mode, and the maximum value of the adjusted brightness in the first gamma curve is the maximum brightness (eg, 2000 nit) in the PLC mode.

[0111] Figure 5 FIG. 1 is a schematic diagram showing a first gamma curve according to an embodiment of the present disclosure. Figure 5 As shown, the first gamma curve can be an independent gamma curve dedicated to the PLC mode, and the horizontal axis (DBV) can represent the brightness control parameter, which can be the adjusted grayscale value. The vertical axis can represent the adjusted brightness. It can be seen that when DBV is 255, it corresponds to APL of 30%. At this time, the adjusted brightness can reach the maximum value (2000nit) in the PCL mode.

[0112] Figure 6 FIG. 1 is a schematic diagram showing a gamma curve according to an embodiment of the present disclosure. Figure 6 As shown, the first gamma curve can also be a part of the complete gamma curve, such as the curve portion corresponding to the horizontal axis (DBV) value of 424 to 511 and the vertical axis (Lv) value of 1000nit to 2000nit. The brightness control parameter (DBV) here can be obtained by converting the adjusted grayscale value and linearly converting it to the value range of 424 to 511. It can be seen that when DBV is 255, it corresponds to APL of 30%, and the adjusted brightness can reach the maximum value (2000nit) in PCL mode.

[0113] In the process of interpolating the brightness control parameter and the gamma curve corresponding to the image to be displayed to determine the adjusted brightness of the image to be displayed, it is possible to:

[0114] When the average image level of the image to be displayed is less than the second preset threshold, interpolation is performed according to the brightness control parameter corresponding to the image to be displayed and the first gamma curve to determine the adjusted brightness of the image to be displayed.

[0115] The adjusted brightness corresponding to the brightness control parameter corresponding to the image to be displayed in the first gamma curve may be used as the adjusted brightness of the image to be displayed.

[0116] In the process of interpolating the brightness control parameter and the gamma curve corresponding to the image to be displayed to determine the adjusted brightness of the image to be displayed, it is possible to:

[0117] When the average image level of the image to be displayed reaches a second preset threshold, the PLC mode is exited and the HBM is started.

[0118] For example, when the average image level of the image to be displayed reaches 100%, the HBM may be entered.

[0119] The gamma curve may include a second gamma curve corresponding to HBM, and the maximum value of the adjusted brightness in the second gamma curve is the maximum brightness under HBM (eg, 1000 nit).

[0120] Figure 7 FIG. 1 is a schematic diagram showing a second gamma curve according to an embodiment of the present disclosure. Figure 7 As shown, the second gamma curve can be an independent gamma curve dedicated to HBM, and the horizontal axis (DBV) can represent the brightness control parameter. In HBM, the grayscale value of the image to be displayed will not be adjusted. Here, DBV can be the grayscale value of the image to be displayed before adjustment. The vertical axis can represent the brightness after adjustment. In HBM, the maximum value of the adjusted brightness is the maximum value under HBM (1000nit).

[0121] See also Figure 6 , the second gamma curve can also be a part of the complete gamma curve, such as Figure 6 The corresponding horizontal axis (DBV) takes a value of 256 to 424, and the vertical axis (Lv) takes a value of 600nit to 1000nit. The brightness control parameter (DBV) here can be obtained by converting the unadjusted grayscale value of the displayed image and linearly converting it to a value range of 256 to 424. The range corresponding to DBV less than 256 corresponds to the gamma curve in normal mode. This part of the application scenario can be implemented based on the existing technology and will not be repeated in this disclosure.

[0122] When the HBM is enabled, interpolation may be performed based on the pixel value of the image to be displayed and the second gamma curve to determine the adjusted brightness of the image to be displayed.

[0123] Among them, the grayscale value can be determined based on the pixel value of the image to be displayed, and the brightness control parameter under HBM is obtained based on the grayscale value according to the above method, and the adjusted brightness corresponding to the brightness control parameter under HBM in the second gamma curve is used as the adjusted brightness of the image to be displayed.

[0124] Step S203: displaying the image to be displayed based on the adjusted brightness of the image to be displayed.

[0125] The image to be displayed may be displayed on the OLED display panel according to the adjusted brightness of the image to be displayed corresponding to each pixel in the image to be displayed.

[0126] According to an embodiment of the present disclosure, by calculating the APL of the image to be displayed, wherein the average image level of the image to be displayed is used to characterize the overall brightness of the image to be displayed, and when the PCL mode is started, the adjusted brightness of the image to be displayed is determined based on the APL of the image to be displayed, the brightness adjustment of the image to be displayed in the PLC mode can be implemented to improve its display brightness and enhance its dynamic contrast range, and by displaying the image to be displayed based on the adjusted brightness of the image to be displayed, the display quality of the displayed content can be improved.

[0127] Figure 8 FIG. 1 is a schematic diagram showing the effect of turning on the PLC mode according to an embodiment of the present disclosure. Figure 8 As shown, PLCOff and PLC On can respectively represent the display effect on the OLED wearable device when the PLC mode of the present disclosure is not turned on and when the PLC mode of the present disclosure is turned on for brightness control. It can be seen that the brightness of the displayed content can be significantly improved through the PLC mode provided by the present disclosure. As shown in the left half, the brightness of the pointer is only 1000nit when the PLC mode is not turned on, and the brightness can reach 2000nit after the PLC mode is turned on. Figure 8 It can also be seen that when the image to be displayed is a high dynamic range image (HDR), the dynamic contrast range can be further enhanced by the embodiments of the present disclosure, so that the foreground part (such as Figure 8 The middle pointer part) is brighter and the background part is darker.

[0128] Fig. 9 FIG. 2 is a schematic diagram showing the test results after the PLC mode is turned on according to an embodiment of the present disclosure. Fig. 9 The Brightness shown can represent the brightness at different APLs, and x and y can represent the degree of color deviation (the standard value of x is 0.3, and the standard value of y is 0.315). Fig. 9 It can be seen from the table and line graph in (the horizontal axis is APL and the vertical axis is brightness) that the brightness control scheme of the embodiment of the present disclosure can meet the display requirements of picture brightness and color coordinates. When the APL transitions from 30% to 100%, the method of the embodiment of the present disclosure can linearly reduce the adjusted brightness of the image to be displayed from 2000nit to the maximum brightness of 1000nit under HBM. When the APL reaches 100%, it switches to HBM to complete the switching from PLC mode to HBM.

[0129] Fig.10 FIG. 2 shows a structural diagram of a display brightness control device according to an embodiment of the present disclosure. Fig.10 As shown, the device comprises:

[0130] A calculation module 1001 is used to calculate an average image level of an image to be displayed, where the average image level of the image to be displayed is used to represent the overall brightness of the image to be displayed;

[0131] A determination module 1002, configured to determine the adjusted brightness of the image to be displayed based on the average image level of the image to be displayed when the peak brightness compensation mode is enabled;

[0132] The display module 1003 is configured to display the image to be displayed based on the adjusted brightness of the image to be displayed.

[0133] In a possible implementation, the determining module 1002 is configured to:

[0134] Determining brightness control parameters corresponding to the image to be displayed according to the average image level and peak brightness curve of the image to be displayed;

[0135] Interpolation is performed according to the brightness control parameter and the gamma curve corresponding to the image to be displayed to determine the adjusted brightness of the image to be displayed; wherein the gamma curve represents the adjusted brightness corresponding to different brightness control parameters.

[0136] In a possible implementation, the peak brightness curve represents the peak brightness corresponding to different average image levels;

[0137] Determine the brightness control parameters corresponding to the image to be displayed according to the average image level and peak brightness curve of the image to be displayed, including:

[0138] Determining the peak brightness of the image to be displayed according to the average image level and the peak brightness curve of the image to be displayed;

[0139] Based on the difference between the peak brightness corresponding to the image to be displayed and the maximum brightness in the peak brightness compensation mode, a brightness control parameter corresponding to the image to be displayed is determined.

[0140] In a possible implementation, in the peak brightness curve, the peak brightness corresponding to the average image level not greater than the first preset threshold is the maximum brightness in the peak brightness compensation mode;

[0141] In the peak brightness curve, the peak brightness corresponding to the average image level equal to the second preset threshold is the maximum brightness in the highlight mode, wherein the first preset threshold is less than the second preset threshold, and the maximum brightness in the peak brightness compensation mode is greater than the maximum brightness in the highlight mode;

[0142] In the peak brightness curve, the average image level greater than the first preset threshold and less than the second preset threshold is inversely proportional to the corresponding peak brightness.

[0143] In a possible implementation, the computing module 1001 is configured to:

[0144] Performing grayscale data conversion on the image to be displayed to obtain a grayscale image corresponding to the image to be displayed;

[0145] Based on the grayscale image corresponding to the image to be displayed, the average image level of the image to be displayed is calculated.

[0146] In a possible implementation, the gamma curve includes a first gamma curve corresponding to the peak brightness compensation mode, and the maximum value of the adjusted brightness in the first gamma curve is the maximum brightness in the peak brightness compensation mode;

[0147] Interpolating according to the brightness control parameter corresponding to the image to be displayed and the gamma curve to determine the adjusted brightness of the image to be displayed includes:

[0148] When the average image level of the image to be displayed is less than the second preset threshold, interpolation is performed according to the brightness control parameter corresponding to the image to be displayed and the first gamma curve to determine the adjusted brightness of the image to be displayed.

[0149] In a possible implementation, the gamma curve includes a second gamma curve corresponding to the highlight mode, and the maximum value of the adjusted brightness in the second gamma curve is the maximum brightness in the highlight mode;

[0150] Interpolating according to the brightness control parameter corresponding to the image to be displayed and the gamma curve to determine the adjusted brightness of the image to be displayed includes:

[0151] When the average image level of the image to be displayed is a second preset threshold, exiting the peak brightness compensation mode and starting the highlight mode;

[0152] When the highlight mode is enabled, interpolation is performed based on the pixel values ​​of the image to be displayed and the second gamma curve to determine the adjusted brightness of the image to be displayed.

[0153] According to an embodiment of the present disclosure, by calculating the APL of the image to be displayed, wherein the APL of the image to be displayed is used to characterize the overall brightness of the image to be displayed, and when the PCL mode is started, the adjusted brightness of the image to be displayed is determined based on the APL of the image to be displayed, the brightness adjustment of the image to be displayed in the PLC mode can be implemented to improve its display brightness and enhance its dynamic contrast range, and by displaying the image to be displayed based on the adjusted brightness of the image to be displayed, the display quality of the displayed content can be improved.

[0154] According to another aspect of the present disclosure, a chip is provided, comprising the above-mentioned display brightness control device.

[0155] The present disclosure also provides a display device, comprising a plurality of display units and at least one of the above-mentioned display brightness control devices.

[0156] In one possible implementation, the display unit includes a display panel, and the display panel includes at least one of a liquid crystal display panel, a micro light emitting diode display panel, a light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electrowetting display panel and a small pitch display panel.

[0157] The present disclosure also provides an electronic device, comprising the above-mentioned display device.

[0158] The present disclosure also provides an electronic device, comprising: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to implement the above method when executing the instructions stored in the memory.

[0159] The present disclosure also provides a non-volatile computer-readable storage medium having computer program instructions stored thereon, wherein the computer program instructions implement the above method when executed by a processor.

[0160] The present disclosure also provides a computer program product, including a computer-readable code, or a non-volatile computer-readable storage medium carrying the computer-readable code. When the computer-readable code runs in a processor of an electronic device, the processor in the electronic device executes the above method.

[0161] Exemplarily, the electronic devices in this embodiment include but are not limited to desktop computers, televisions, mobile devices with large screens such as mobile phones, tablet computers, and other common electronic devices that require multiple chips to be cascaded to achieve driving.

[0162] Exemplarily, the electronic device may also be a user equipment (UE), a mobile device, a user terminal, a terminal, a handheld device, a computing device or a vehicle-mounted device, etc. Exemplarily, some examples of terminals are: a display, a smart phone or a portable device, a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile Internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control (Industrial Control), a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid (Smart Grid), a wireless terminal in transportation safety (Transportation Safety), a wireless terminal in smart city (Smart City), a wireless terminal in smart home (Smart Home), a wireless terminal in Internet of Vehicles, etc. For example, the server may be a local server or a cloud server.

[0163] Fig.11 1 is a block diagram of an electronic device 1900 according to an embodiment of the present disclosure. For example, the electronic device 1900 may be provided as a server or a terminal device. Fig.11 , the electronic device 1900 includes a processing component 1922, which further includes one or more processors, and a memory resource represented by a memory 1932 for storing instructions executable by the processing component 1922, such as an application. The application stored in the memory 1932 may include one or more modules, each corresponding to a set of instructions. In addition, the processing component 1922 is configured to execute instructions to perform the above method.

[0164] The electronic device 1900 may also include a power supply component 1926 configured to perform power management of the electronic device 1900, a wired or wireless network interface 1950 configured to connect the electronic device 1900 to a network, and an input / output (I / O) interface 1958. The electronic device 1900 may operate based on an operating system stored in the memory 1932, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™ or the like.

[0165] In an exemplary embodiment, a non-volatile computer-readable storage medium is also provided, such as a memory 1932 including computer program instructions, which can be executed by the processing component 1922 of the electronic device 1900 to perform the above method.

[0166] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

[0167] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0168] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0169] The flow chart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to multiple embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a part of a module, program segment or instruction, and a part of the module, program segment or instruction includes one or more executable instructions for realizing the specified logical function. In some alternative implementations, the function marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two continuous square boxes can actually be executed substantially in parallel, and they can sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or action, or can be implemented with a combination of special hardware and computer instructions.

[0170] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A display brightness control method, characterized in that: The method comprises: Calculating an average image level of the image to be displayed, wherein the average image level of the image to be displayed is used to characterize the overall brightness of the image to be displayed; In case the peak brightness compensation mode is activated, determining the adjusted brightness of the image to be displayed based on the average image level of the image to be displayed; Based on the adjusted brightness of the image to be displayed, the image to be displayed is displayed.

2. The method according to claim 1, characterized in that: The step of determining the adjusted brightness of the image to be displayed based on the average image level of the image to be displayed when the peak brightness compensation mode is enabled includes: Determining a brightness control parameter corresponding to the image to be displayed according to an average image level and a peak brightness curve of the image to be displayed; interpolating according to the brightness control parameter and the gamma curve corresponding to the image to be displayed to determine the adjusted brightness of the image to be displayed; The gamma curve represents the adjusted brightness corresponding to different brightness control parameters.

3. The method according to claim 2, characterized in that The peak brightness curve represents the peak brightness corresponding to different average image levels; The step of determining a brightness control parameter corresponding to the image to be displayed according to the average image level and the peak brightness curve of the image to be displayed includes: Determining a peak brightness corresponding to the image to be displayed according to an average image level of the image to be displayed and the peak brightness curve; Based on the difference between the peak brightness corresponding to the image to be displayed and the maximum brightness in the peak brightness compensation mode, a brightness control parameter corresponding to the image to be displayed is determined.

4. The method according to claim 3, characterized in that In the peak brightness curve, the peak brightness corresponding to the average image level not greater than the first preset threshold is the maximum brightness in the peak brightness compensation mode; In the peak brightness curve, the peak brightness corresponding to the average image level equal to the second preset threshold is the maximum brightness in the highlight mode, wherein the first preset threshold is less than the second preset threshold, and the maximum brightness in the peak brightness compensation mode is greater than the maximum brightness in the highlight mode; In the peak brightness curve, the average image level greater than the first preset threshold and less than the second preset threshold is inversely proportional to the corresponding peak brightness.

5. The method according to claim 1, characterized in that The calculating the average image level of the image to be displayed comprises: Performing grayscale data conversion on the image to be displayed to obtain a grayscale image corresponding to the image to be displayed; Based on the grayscale image corresponding to the image to be displayed, an average image level of the image to be displayed is calculated.

6. The method according to claim 4, characterized in that The gamma curve includes a first gamma curve corresponding to the peak brightness compensation mode, and the maximum value of the adjusted brightness in the first gamma curve is the maximum brightness in the peak brightness compensation mode; The interpolating according to the brightness control parameter corresponding to the image to be displayed and the gamma curve to determine the adjusted brightness of the image to be displayed includes: When the average image level of the image to be displayed is less than the second preset threshold, interpolation is performed according to the brightness control parameter corresponding to the image to be displayed and the first gamma curve to determine the adjusted brightness of the image to be displayed.

7. The method according to claim 4, characterized in that The gamma curve includes a second gamma curve corresponding to the highlight mode, and the maximum value of the adjusted brightness in the second gamma curve is the maximum brightness in the highlight mode; The interpolating according to the corresponding brightness control parameter of the image to be displayed and the gamma curve to determine the adjusted brightness of the image to be displayed includes: When the average image level of the to-be-displayed image is equal to the second preset threshold, exiting the peak brightness compensation mode and starting the highlight mode; When the highlight mode is activated, interpolation is performed based on the pixel values ​​of the image to be displayed and the second gamma curve to determine the adjusted brightness of the image to be displayed.

8. A display brightness control device, characterized in that: The device comprises: A calculation module, used for calculating an average image level of the image to be displayed, wherein the average image level of the image to be displayed is used to characterize the overall brightness of the image to be displayed; a determination module, configured to determine the adjusted brightness of the image to be displayed based on the average image level of the image to be displayed when the peak brightness compensation mode is activated; The display module is used to display the image to be displayed based on the adjusted brightness of the image to be displayed.

9. A chip, characterized in that: The chip includes the display brightness control device according to claim 8.

10. A display device, characterized in that: The device comprises a plurality of display units and at least one display brightness control device according to claim 8.

11. The display device according to claim 10, characterized in that The display unit includes a display panel, and the display panel includes at least one of a liquid crystal display panel, a micro light emitting diode display panel, a light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electrowetting display panel and a small pitch display panel.

12. An electronic device comprising the display device according to claim 10 or 11.

13. An electronic device, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor is configured to implement the method described in any one of claims 1 to 7 when executing the instructions stored in the memory.

14. A non-volatile computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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