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

Abstract

The present disclosure relates to a display brightness control method and device, a display device and an electronic device. The method comprises: calculating an average image level of a to-be-displayed image, the average image level of the to-be-displayed image being used to represent overall brightness of the to-be-displayed image; in a case where a peak brightness compensation mode is started, determining an adjusted brightness of the to-be-displayed image based on the average image level of the to-be-displayed image; and displaying the to-be-displayed image based on the adjusted brightness of the to-be-displayed image. According to the embodiments of the present disclosure, the brightness of the to-be-displayed image can be adjusted in the peak brightness compensation mode, so as to improve the display brightness and enhance the dynamic contrast range of the to-be-displayed image, and improve the display quality of the display content.

Description

Technical Field

[0001] This disclosure relates to the field of integrated circuits, and more particularly to a display brightness control method, apparatus, display device, and electronic device. Background Technology

[0002] Among various display panels, organic light-emitting diode (OLED) displays have advantages over liquid crystal displays (LCDs) such as self-illumination, ultra-thinness, fast response speed, wide viewing angle, high contrast and flexible display. Compared with traditional LCDs, it does not require a backlight and is made of a very thin organic material coating, a transparent substrate and cover plate. Under the drive of an electric field, the organic material emits light through the injection and recombination of charge carriers, saving energy while achieving a very high contrast.

[0003] OLED products typically operate at their preset maximum brightness in high-brightness environments, but this still falls short of the required visibility of the displayed content, resulting in less than ideal brightness and contrast. Therefore, a novel display brightness control scheme is urgently needed to improve the display brightness and dynamic contrast range of OLED products, thereby enhancing the overall display quality. Summary of the Invention

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

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

[0006] Calculate the average image level of the image to be displayed, which is used to characterize the overall brightness of the image to be displayed;

[0007] When peak brightness compensation mode is enabled, the adjusted brightness of the image to be displayed is determined based on the average image level of the image to be displayed.

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

[0009] In one possible implementation, when peak brightness compensation mode is activated, the adjusted brightness of the image to be displayed is determined based on the average image level of the image to be displayed, including:

[0010] Based on the average image level and peak brightness curve of the image to be displayed, determine the brightness control parameters corresponding to the image to be displayed;

[0011] The adjusted brightness of the image to be displayed is determined by interpolation based on the brightness control parameters and gamma curve corresponding to the image to be displayed; where the gamma curve represents the adjusted brightness corresponding to different brightness control parameters.

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

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

[0014] Determine the peak brightness of the image to be displayed based on the average image level and peak brightness curve of the image to be displayed;

[0015] The brightness control parameters for the image to be displayed are determined based on the difference between the peak brightness of the image to be displayed and the maximum brightness under peak brightness compensation mode.

[0016] In one possible implementation, the peak brightness corresponding to the average image level that is not greater than a first preset threshold in the peak brightness curve 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 that is equal to the second preset threshold is the maximum brightness in the high brightness mode. 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 high brightness mode.

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

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

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

[0021] Calculate the average image level of the image to be displayed based on the grayscale image corresponding to the image to be displayed.

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

[0023] Based on the brightness control parameters and gamma curve corresponding to the image to be displayed, interpolation is performed to determine the adjusted brightness of the image to be displayed, including:

[0024] When the average image level of the image to be displayed is less than the second preset threshold, interpolation is performed based on the brightness control parameters 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 one possible implementation, the gamma curve includes a second gamma curve corresponding to the high brightness mode, where the maximum value of the adjusted brightness in the second gamma curve is the maximum brightness in the high brightness mode.

[0026] Based on the brightness control parameters and gamma curve corresponding to the image to be displayed, interpolation is performed to determine the adjusted brightness of the image to be displayed, including:

[0027] When the average image level of the image to be displayed is the second preset threshold, exit the peak brightness compensation mode and start the high brightness mode.

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

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

[0030] The calculation module is used to calculate the average image level of the image to be displayed, which is used to characterize the overall brightness of the image to be displayed.

[0031] The determination module is used 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 one possible implementation, a module is defined for:

[0034] Based on the average image level and peak brightness curve of the image to be displayed, determine the brightness control parameters corresponding to the image to be displayed;

[0035] The adjusted brightness of the image to be displayed is determined by interpolation based on the brightness control parameters and gamma curve corresponding to the image to be displayed; where the gamma curve represents the adjusted brightness corresponding to different brightness control parameters.

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

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

[0038] Determine the peak brightness of the image to be displayed based on the average image level and peak brightness curve of the image to be displayed;

[0039] The brightness control parameters for the image to be displayed are determined based on the difference between the peak brightness of the image to be displayed and the maximum brightness under peak brightness compensation mode.

[0040] In one possible implementation, the peak brightness corresponding to the average image level that is not greater than a first preset threshold in the peak brightness curve 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 that is equal to the second preset threshold is the maximum brightness in the high brightness mode. 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 high brightness mode.

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

[0043] In one possible implementation, the computation module is used for:

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

[0045] Calculate the average image level of the image to be displayed based on the grayscale image corresponding to the image to be displayed.

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

[0047] Based on the brightness control parameters and gamma curve corresponding to the image to be displayed, interpolation is performed to determine the adjusted brightness of the image to be displayed, including:

[0048] When the average image level of the image to be displayed is less than the second preset threshold, interpolation is performed based on the brightness control parameters 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 one possible implementation, the gamma curve includes a second gamma curve corresponding to the high brightness mode, where the maximum value of the adjusted brightness in the second gamma curve is the maximum brightness in the high brightness mode.

[0050] Based on the brightness control parameters and gamma curve corresponding to the image to be displayed, interpolation is performed to determine the adjusted brightness of the image to be displayed, including:

[0051] When the average image level of the image to be displayed is the second preset threshold, exit the peak brightness compensation mode and start the high brightness mode.

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

[0053] According to another aspect of this disclosure, a chip is provided that includes the above-described display brightness control device.

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

[0055] In one possible implementation, the display unit includes a display panel, which 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 this disclosure, an electronic device is provided, including the aforementioned display device.

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

[0058] According to another aspect of this disclosure, a non-volatile computer-readable storage medium is provided that stores computer program instructions thereon, wherein the computer program instructions, when executed by a processor, implement the above-described method.

[0059] According to another aspect of this disclosure, a computer program product is provided, including computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code, wherein when the computer-readable code is run in a processor of an electronic device, the processor in the electronic device performs the above-described method.

[0060] According to embodiments of this 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 activated, the adjusted brightness of the image to be displayed is determined based on the average image level of the image to be displayed, so as to realize the brightness adjustment of the image to be displayed in the peak brightness compensation mode, thereby improving its display brightness and enhancing 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] Other features and aspects of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

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

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

[0064] Figure 2 A flowchart 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 is provided.

[0066] Figure 4 This diagram illustrates the determination of brightness control parameters corresponding to an image to be displayed according to an embodiment of the present disclosure.

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

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

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

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

[0071] Figure 9 A schematic diagram showing the test results after enabling PLC mode according to an embodiment of the present disclosure is displayed.

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

[0073] Figure 11 A block diagram of an electronic device 1900 according to an embodiment of the present disclosure is shown. Detailed Implementation

[0074] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0075] In the description of this disclosure, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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. In the description of this disclosure, "a plurality of" means two or more, unless otherwise expressly specified.

[0077] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0078] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean 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) displays offer advantages over liquid crystal displays (LCDs) such as self-illumination, ultra-thinness, fast response time, wide viewing angle, high contrast, and flexible display. Compared to traditional LCDs, OLEDs do not require backlights and are made using a very thin organic material coating, a transparent substrate, and a cover plate. Driven by an electric field, the organic material emits light through the injection and recombination of charge carriers, saving energy while achieving high contrast. OLED products typically display at a preset maximum brightness in high-brightness environments, but this still cannot meet the visibility requirements of the displayed content, resulting in less than ideal brightness and contrast. Therefore, a new display brightness control scheme is urgently needed to improve the display brightness and enhance the dynamic contrast range of OLED products, thereby improving the display quality.

[0080] In view of this, the present disclosure provides a display brightness control method, apparatus, display device, and electronic device. The display brightness control method of the present disclosure calculates the average picture level (APL) of the image to be displayed, where the average picture level characterizes the overall brightness of the image. When peak luminance compensation (PLC) mode is activated, the adjusted brightness of the image to be displayed is determined based on the average picture level. This enables brightness adjustment of the image to be displayed in PLC mode, thereby improving its display brightness and enhancing its dynamic contrast range. By displaying the image based on its adjusted brightness, the display quality of the displayed content can be improved.

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

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

[0083] Figure 2 A flowchart illustrating a display brightness control method according to an embodiment of the present disclosure is shown. This method can be used in display devices, such as… Figure 2 As shown, the method may include:

[0084] Step S201: Calculate the average image grade of the image to be displayed.

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

[0086] APL can be used to characterize the overall brightness level of an image. A higher APL value indicates that there are more high-brightness (such as white) pixels in the image.

[0087] In step S201, the following can be done:

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

[0089] Specifically, for each pixel in the image to be displayed, the pixel values ​​of the RGB three channels of that pixel can be weighted and summed according to preset weights to obtain the 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] Where Y can represent the gray value of the corresponding pixel in the grayscale image, and R, G, and B can represent the pixel values ​​of the RGB channels of that 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. The average image level is obtained by dividing this average value by the preset maximum brightness value of the image (e.g., 255). The range of the average image level is, for example, 0% to 100%.

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

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

[0095] Specifically, when PLC mode is enabled, if the average image level of the image to be displayed is greater than a first preset threshold but less than a second preset threshold, the lower the average image level, the higher the adjusted brightness of the image. The first preset threshold can be adjusted as needed, for example, to 30%. This allows for further improvement of the brightness of the image to be displayed in PLC mode.

[0096] In step S202, the following can be done:

[0097] Based on the average image level and peak brightness curve of the image to be displayed, determine the brightness control parameters corresponding to the image to be displayed.

[0098] The peak brightness curve represents the peak brightness corresponding to different APL values. Peak brightness represents the desired value of the adjusted brightness.

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

[0100] In the peak brightness curve, the peak brightness corresponding to an APL not greater than the first preset threshold is the maximum brightness in PLC mode; in the peak brightness curve, the peak brightness corresponding to an APL equal to the second preset threshold is the maximum brightness in HBM mode, wherein the first preset threshold is less than the second preset threshold, and the maximum brightness in PLC mode is greater than the maximum brightness in HBM mode; 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 the text is 2000 nits. The maximum brightness under HBM can also be a preset value, such as... Figure 3 The example in the example is 1000 nits.

[0102] In determining the brightness control parameters for the image to be displayed based on its average image level and peak brightness curve, the following can be done:

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

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

[0105] Next, the RGB pixel values ​​of each pixel in the image to be displayed can be adjusted based on the difference between the peak brightness of the image to be displayed and the maximum brightness in PLC mode.

[0106] One adjustment method can be found in [reference]. Figure 4 This diagram illustrates the determination of brightness control parameters corresponding to an image to be displayed according to an embodiment of the present disclosure. Figure 4 As shown, the horizontal axis (In data) and the vertical axis (Out data) can represent the RGB pixel values ​​before and after adjustment, respectively. The red dashed line represents the linear mapping relationship between the RGB pixel values ​​before and after adjustment. The difference between the peak brightness of the image to be displayed and the maximum brightness in 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). Based on the adjusted linear mapping, the RGB pixel values ​​corresponding to each pixel point after adjustment are determined (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 formula above based on the adjusted RGB pixel value of that pixel. The brightness control parameter corresponding to that pixel can then be determined based on the recalculated grayscale value. For example, the grayscale value of a pixel can be used as its brightness control parameter.

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

[0109] The gamma curve can be a pre-modulated exponential curve, representing the adjusted brightness corresponding to different brightness control parameters. The relationship between the brightness control parameters (which can be the adjusted grayscale values ​​mentioned above) and the adjusted brightness can be linear or non-linear.

[0110] The gamma curve can include the first gamma curve corresponding to the PLC mode. The maximum value of the adjusted brightness in the first gamma curve is the maximum brightness in the PLC mode (e.g., 2000 nits).

[0111] Figure 5 A schematic diagram of a first gamma curve according to an embodiment of the present disclosure is shown. Figure 5 As shown, the first gamma curve can be a separate gamma curve specifically for PLC mode. The horizontal axis (DBV) can represent the brightness control parameter, which can be the adjusted grayscale value here. The vertical axis can represent the adjusted brightness. It can be seen that when DBV is 255, it corresponds to APL of 30%, and the adjusted brightness can reach the maximum value (2000 nits) in PCL mode.

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

[0113] In the process of determining the adjusted brightness of the image to be displayed by interpolating based on the brightness control parameters and gamma curve corresponding to the image to be displayed, the following can be done:

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

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

[0116] In the process of determining the adjusted brightness of the image to be displayed by interpolating based on the brightness control parameters and gamma curve corresponding to the image to be displayed, the following can be done:

[0117] When the average image level of the image to be displayed reaches the second preset threshold, exit PLC mode and start HBM.

[0118] For example, you can enter HBM when the average image quality of the image to be displayed reaches 100%.

[0119] The gamma curve mentioned above may include the second gamma curve corresponding to HBM, where the maximum value of the adjusted brightness in the second gamma curve is the maximum brightness under HBM (e.g., 1000 nits).

[0120] Figure 7 A schematic diagram of a second gamma curve according to an embodiment of the present disclosure is shown. Figure 7 As shown, the second gamma curve can be a separate gamma curve specifically for HBM. The horizontal axis (DBV) represents the brightness control parameter. In HBM, the grayscale values ​​of the image to be displayed are not adjusted; here, DBV can be the grayscale value of the image before adjustment. The vertical axis represents the adjusted brightness. In HBM, the maximum value of the adjusted brightness is the maximum value under HBM (1000 nits).

[0121] See Figure 6 The second gamma curve can also be a part of a complete gamma curve, such as... Figure 6 The curve portion corresponds to the horizontal axis (DBV) with values ​​ranging from 256 to 424 and the vertical axis (Lv) with values ​​ranging from 600 nits to 1000 nits. The brightness control parameter (DBV) here can be obtained by converting the unadjusted grayscale values ​​of the image to be displayed, linearly transforming them to the value range of 256 to 424. The range corresponding to DBV less than 256 corresponds to the gamma curve in normal mode; this application scenario can be implemented based on existing technology and will not be elaborated upon in this disclosure.

[0122] With HBM enabled, the adjusted brightness of the image to be displayed can be determined by interpolation based on the pixel values ​​of the image to be displayed and the second gamma curve.

[0123] Specifically, the grayscale value can be determined based on the pixel value of the image to be displayed. The brightness control parameter under HBM can be obtained based on the grayscale value according to the above method. 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: Display the image to be displayed based on the adjusted brightness of the image to be displayed.

[0125] Specifically, the image to be displayed can be displayed on the OLED display panel based on the adjusted brightness of the image corresponding to each pixel in the image to be displayed.

[0126] According to embodiments of this 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 PCL mode is activated, the adjusted brightness of the image to be displayed is determined based on the APL of the image to be displayed, the brightness of the image to be displayed can be adjusted in PLC 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.

[0127] Figure 8 This diagram illustrates the effect of enabling PLC mode according to an embodiment of the present disclosure. Figure 8 As shown, PLCOff and PLCOn represent the display effects of brightness control on an OLED wearable device with and without the PLC mode of this disclosure enabled. It can be seen that the PLC mode provided by this disclosure can significantly improve the brightness of the displayed content. As illustrated in the left half, the pointer's brightness is only 1000 nits without the PLC mode enabled, but reaches 2000 nits after enabling the PLC mode. 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 through the embodiments of this disclosure, making the foreground part (such as...) more prominent. Figure 8 The middle pointer area is brighter, while the background area is darker.

[0128] Figure 9 A schematic diagram showing test results after enabling PLC mode according to an embodiment of this disclosure is illustrated. Figure 9 The Brightness shown represents the brightness under different APL values, and x and y represent the degree of color shift (the standard value for x is 0.3, and the standard value for y is 0.315). From Figure 9 As can be seen from the table and line graph (horizontal axis is APL, vertical axis is brightness), the brightness control scheme of this embodiment can meet the display requirements of screen brightness and color coordinates. When APL transitions from 30% to 100%, the method of this embodiment can linearly reduce the adjusted brightness of the image to be displayed from 2000 nits to the maximum brightness of 1000 nits under HBM. When APL reaches 100%, it switches to HBM, completing the switch from PLC mode to HBM.

[0129] Figure 10 A structural diagram of a display brightness control device according to an embodiment of the present disclosure is shown. Figure 10 As shown, the device includes:

[0130] Calculation module 1001 is used to calculate the average image level of the image to be displayed, which is used to characterize the overall brightness of the image to be displayed;

[0131] The determining module 1002 is used 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.

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

[0133] In one possible implementation, module 1002 is configured to:

[0134] Based on the average image level and peak brightness curve of the image to be displayed, determine the brightness control parameters corresponding to the image to be displayed;

[0135] The adjusted brightness of the image to be displayed is determined by interpolation based on the brightness control parameters and gamma curve corresponding to the image to be displayed; where the gamma curve represents the adjusted brightness corresponding to different brightness control parameters.

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

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

[0138] Determine the peak brightness of the image to be displayed based on the average image level and peak brightness curve of the image to be displayed;

[0139] The brightness control parameters for the image to be displayed are determined based on the difference between the peak brightness of the image to be displayed and the maximum brightness under peak brightness compensation mode.

[0140] In one possible implementation, the peak brightness corresponding to the average image level that is not greater than the first preset threshold in the peak brightness curve 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 that is equal to the second preset threshold is the maximum brightness in the high brightness mode. 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 high brightness mode.

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

[0143] In one possible implementation, the computing module 1001 is used for:

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

[0145] Calculate the average image level of the image to be displayed based on the grayscale image corresponding to the image to be displayed.

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

[0147] Based on the brightness control parameters and gamma curve corresponding to the image to be displayed, interpolation is performed to determine the adjusted brightness of the image to be displayed, including:

[0148] When the average image level of the image to be displayed is less than the second preset threshold, interpolation is performed based on the brightness control parameters 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 one possible implementation, the gamma curve includes a second gamma curve corresponding to the high brightness mode, where the maximum value of the adjusted brightness in the second gamma curve is the maximum brightness in the high brightness mode.

[0150] Based on the brightness control parameters and gamma curve corresponding to the image to be displayed, interpolation is performed to determine the adjusted brightness of the image to be displayed, including:

[0151] When the average image level of the image to be displayed is the second preset threshold, exit the peak brightness compensation mode and start the high brightness mode.

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

[0153] According to embodiments of this 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 in the case of activating PCL mode, the adjusted brightness of the image to be displayed is determined based on the APL of the image to be displayed, so as to realize the brightness adjustment of the image to be displayed in PLC mode, thereby improving its display brightness and enhancing 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.

[0154] According to another aspect of this disclosure, a chip is provided that includes the above-described display brightness control device.

[0155] This disclosure also provides a display device, including a plurality of display units and at least one of the above-described display brightness control devices.

[0156] In one possible implementation, the display unit includes a display panel, which 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] This disclosure also provides an electronic device, including the above-described display device.

[0158] This disclosure also provides an electronic device, including: a processor; 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] This disclosure also provides a non-volatile computer-readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by a processor, implement the above-described method.

[0160] This disclosure also provides a computer program product, including computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code, wherein when the computer-readable code is run in a processor of an electronic device, the processor in the electronic device performs the above-described method.

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

[0162] For example, electronic devices can also be user equipment (UE), mobile devices, user terminals, terminals, handheld devices, computing devices, or in-vehicle devices, etc. Examples of terminals include: displays, smartphones or portable devices, mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and wireless terminals in vehicle-to-everything (V2X) networks, etc. For example, a server can be a local server or a cloud server.

[0163] Figure 11 A block diagram of an electronic device 1900 according to an embodiment of the present disclosure is shown. For example, the electronic device 1900 may be provided as a server or a terminal device. (Refer to...) Figure 11 The electronic device 1900 includes a processing component 1922, which further includes one or more processors, and memory resources represented by memory 1932 for storing instructions, such as application programs, that can be executed by the processing component 1922. The application programs stored in memory 1932 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processing component 1922 is configured to execute instructions to perform the methods described above.

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

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

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

[0167] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0168] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0169] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0170] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A method for controlling display brightness, characterized in that, The method includes: Calculate the average image level of the image to be displayed, which is used to characterize the overall brightness of the image to be displayed; When peak brightness compensation mode is activated, the adjusted brightness of the image to be displayed is determined 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; 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 includes: Based on the average image level and peak brightness curve of the image to be displayed, determine the brightness control parameters corresponding to the image to be displayed; The adjusted brightness of the image to be displayed is determined by interpolation based on the brightness control parameters and gamma curve corresponding to the image to be displayed. The gamma curve represents the adjusted brightness corresponding to different brightness control parameters, and the peak brightness curve represents the peak brightness corresponding to different average image levels. The step of determining the brightness control parameters corresponding to the image to be displayed based on the average image level and peak brightness curve of the image to be displayed includes: The peak brightness of the image to be displayed is determined based on the average image level of the image to be displayed and the peak brightness curve. Based on the difference between the peak brightness of the image to be displayed and the maximum brightness under the peak brightness compensation mode, the brightness control parameters corresponding to the image to be displayed are determined. The difference is used to adjust the RGB pixel values ​​corresponding to each pixel in the image to be displayed, and the brightness control parameters corresponding to each pixel are determined based on the adjusted RGB pixel values.

2. The method according to claim 1, characterized in that, In the peak brightness curve, the peak brightness corresponding to the average image level that is 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 that is equal to the second preset threshold is the maximum brightness in the high brightness 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 high brightness mode. In the peak brightness curve, the average image level that is greater than the first preset threshold and less than the second preset threshold is inversely proportional to the corresponding peak brightness.

3. The method according to claim 1, characterized in that, The calculation of the average image grade of the image to be displayed includes: The image to be displayed is converted to grayscale data to obtain a grayscale image corresponding to the image to be displayed. Based on the grayscale image corresponding to the image to be displayed, calculate the average image level of the image to be displayed.

4. The method according to claim 2, 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 step of determining the adjusted brightness of the image to be displayed by interpolating based on the brightness control parameters and gamma curve corresponding to the image to be displayed includes: When the average image level of the image to be displayed is less than the second preset threshold, the adjusted brightness of the image to be displayed is determined by interpolation based on the brightness control parameters corresponding to the image to be displayed and the first gamma curve.

5. The method according to claim 2, characterized in that, The gamma curve includes a second gamma curve corresponding to the high brightness mode, and the maximum value of the adjusted brightness in the second gamma curve is the maximum brightness in the high brightness mode. The step of determining the adjusted brightness of the image to be displayed by interpolating based on the corresponding brightness control parameters and gamma curve of the image to be displayed includes: When the average image level of the image to be displayed is the second preset threshold, the peak brightness compensation mode is exited and the high brightness mode is activated. When the high-brightness mode is activated, the adjusted brightness of the image to be displayed is determined by interpolation based on the pixel values ​​of the image to be displayed and the second gamma curve.

6. A display brightness control device, characterized in that, The device includes: The calculation module is used to calculate the average image level of the image to be displayed, which is used to characterize the overall brightness of the image to be displayed; The determination module is used 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; The determining module is used for: Based on the average image level and peak brightness curve of the image to be displayed, determine the brightness control parameters corresponding to the image to be displayed; The adjusted brightness of the image to be displayed is determined by interpolation based on the brightness control parameters and gamma curve corresponding to the image to be displayed. The gamma curve represents the adjusted brightness corresponding to different brightness control parameters, and the peak brightness curve represents the peak brightness corresponding to different average image levels. The step of determining the brightness control parameters corresponding to the image to be displayed based on the average image level and peak brightness curve of the image to be displayed includes: The peak brightness of the image to be displayed is determined based on the average image level of the image to be displayed and the peak brightness curve. Based on the difference between the peak brightness of the image to be displayed and the maximum brightness under the peak brightness compensation mode, the brightness control parameters corresponding to the image to be displayed are determined. The difference is used to adjust the RGB pixel values ​​corresponding to each pixel in the image to be displayed, and the brightness control parameters corresponding to each pixel are determined based on the adjusted RGB pixel values.

7. A chip, characterized in that, The chip includes the display brightness control device as described in claim 6.

8. A display device, characterized in that, It includes multiple display units and at least one display brightness control device according to claim 6.

9. The display device according to claim 8, characterized in that, The display unit includes a display panel, which includes at least one of the following: liquid crystal display panel, micro light-emitting diode display panel, light-emitting diode display panel, mini light-emitting diode display panel, quantum dot light-emitting diode display panel, organic light-emitting diode display panel, cathode ray tube display panel, digital light processing display panel, field emission display panel, plasma display panel, electrophoretic display panel, electrowetting display panel, and small-pitch display panel.

10. An electronic device comprising the display device according to claim 8 or 9.

11. An electronic device, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor is configured to implement the method of any one of claims 1 to 5 when executing instructions stored in the memory.

12. A non-volatile computer-readable storage medium storing computer program instructions thereon, characterized in that, When the computer program instructions are executed by the processor, they implement the method described in any one of claims 1 to 5.

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