Backlight control method, backlight module and display device

Abstract

The application is suitable for the technical field of display, and provides a backlight control method, a backlight module and a display device. The method comprises the following steps: acquiring a to-be-displayed image, determining a scene type according to an image feature, and determining corresponding direct current current position, pulse width modulation frequency and crosstalk compensation strength; determining target brightness of each color channel in each backlight partition according to the to-be-displayed image, and correcting the target brightness in combination with the crosstalk compensation strength and a crosstalk coefficient corresponding to each color channel combination to obtain driving brightness; and outputting a corresponding backlight driving signal according to the direct current current position, the pulse width modulation frequency and the driving brightness. The above scheme can improve the adaptability of backlight control to different display scenes and improve the comprehensive display effect.

Description

Technical Field

[0001] This application belongs to the field of display technology, and in particular relates to a backlight control method, a backlight module, and a display device. Background Technology

[0002] Mini-LED (Mini Light Emitting Diode) backlight technology features small size, high brightness, and ease of localized control. Among these, RGB (Red, Green, and Blue) tri-color backlight technology allows for the adjustment of backlight brightness and color by controlling the light-emitting units of different colors, thereby improving the color gamut, color accuracy, and contrast of display devices. As displayed content becomes increasingly diverse, different types of display screens place different demands on backlight control.

[0003] However, existing backlight control technologies have limited adaptability to complex display content, and are prone to problems such as color cast, insufficient color performance, and halo effects in different display scenarios, and it is difficult to balance different display effects. Therefore, how to improve the adaptability of backlight control to improve the overall display effect in different display scenarios is a technical problem that urgently needs to be solved in current backlight control technology. Summary of the Invention

[0004] In view of this, embodiments of this application provide a backlight control method, a backlight module, and a display device, which can improve the adaptability of backlight control to different display scenarios and improve the overall display effect under different display scenarios.

[0005] A first aspect of this application provides a backlight control method, the method comprising: Get the image to be displayed; Based on the image features of the image to be displayed, determine the scene type corresponding to the image to be displayed; Based on the scene type, determine the hybrid dimming strategy parameters corresponding to the scene type. The hybrid dimming strategy parameters include at least: DC current level, pulse width modulation frequency, and crosstalk compensation strength. Based on the image to be displayed, determine the target brightness corresponding to each color channel of at least one backlight zone in the display panel in the first color space; Based on the crosstalk compensation strength and the crosstalk coefficient corresponding to each color channel combination between each backlight partition, the target brightness corresponding to any color channel in the first backlight partition is corrected to obtain the driving brightness corresponding to any color channel. The first backlight partition is any one of at least one of the backlight partitions. Based on the DC current level, the pulse width modulation frequency, and the driving brightness corresponding to any of the color channels, output the backlight driving signal corresponding to any of the color channels.

[0006] In this embodiment, by acquiring the image to be displayed and determining the corresponding scene type based on the image features of the image to be displayed, the display scene characteristics of the current image to be displayed can be identified. Further, based on the scene type, the corresponding DC current level, pulse width modulation frequency, and crosstalk compensation intensity are determined so that the hybrid dimming strategy parameters can match the current display scene. On this basis, the target brightness corresponding to each color channel in each backlight zone is determined based on the image to be displayed, thus obtaining the zone and color brightness requirements corresponding to the image content. Further, by combining the crosstalk coefficient corresponding to the combination of each color channel between each backlight zone and the crosstalk compensation intensity to correct the target brightness, the impact of crosstalk between different backlight zones and color channels on the actual output brightness can be reduced, resulting in a driving brightness that better meets the target display requirements. Then, based on the DC current level, pulse width modulation frequency, and driving brightness, a corresponding backlight driving signal is output to achieve backlight driving control adapted to the current display scene and backlight zone brightness requirements, thereby improving the adaptability of backlight control to different display scenes and improving the overall display effect under different display scenes.

[0007] In one possible implementation, The method further includes: Convert the image to be displayed from the first color space to the second color space; At least one of the following features—color distribution features, spatial frequency features, saliency features, and temporal domain features—is extracted from the image to be displayed in the second color space as the image features. Based on the image features of the image to be displayed, the scene type corresponding to the image to be displayed is determined, including: The scene type corresponding to the image to be displayed is determined based on at least one of the color distribution features, spatial frequency features, saliency features, and temporal domain features.

[0008] In this embodiment, scene recognition of the image to be displayed is performed based on at least one of color distribution features, spatial frequency features, saliency features, and temporal domain features, which helps to improve the accuracy and adaptability of scene recognition for different display content.

[0009] In one possible implementation, determining the scene type corresponding to the image to be displayed based on its image features includes: When the color distribution features meet the first condition, the image to be displayed is determined to correspond to a first scene type. The first condition includes: the proportion of pixels corresponding to the dominant color is greater than a preset dominant color proportion threshold, the proportion of the highly saturated pixel area is greater than a preset saturation proportion threshold, and the light-colored pixel area exists. The hybrid dimming strategy parameters corresponding to the first scene type include: a first DC current level, a first pulse width modulation frequency, and a first crosstalk compensation strength; Wherein, the first DC current level is used to determine the first reference DC current of the color channel corresponding to the dominant color from a preset reference DC current lookup table, and the first reference DC current is less than the preset reference DC current. The first pulse width modulation frequency is higher than the preset reference pulse width modulation frequency; The first crosstalk compensation intensity is used to adjust the crosstalk amount determined according to the crosstalk coefficients corresponding to each color channel combination between adjacent backlight zones, so as to determine the crosstalk compensation amount between adjacent backlight zones.

[0010] In this embodiment, scene recognition of the image to be displayed is performed based on at least one of color distribution features, spatial frequency features, saliency features, and temporal domain features, which helps to improve the accuracy and adaptability of scene recognition for different display content.

[0011] In one possible implementation, determining the hybrid dimming strategy parameters corresponding to the scene type based on the scene type includes: When the image to be displayed corresponds to at least two of the scene types, the weight corresponding to each scene type is determined; Based on the weights corresponding to each scene type and the hybrid dimming strategy parameters corresponding to each scene type, the hybrid dimming strategy parameters corresponding to the image to be displayed are determined.

[0012] In this implementation, the weights corresponding to each scene type in the image to be displayed are determined, and the final mixed dimming strategy parameters are determined in combination with the mixed dimming strategy parameters corresponding to each scene type, which helps to improve the adaptability of backlight control to mixed scenes.

[0013] In one possible implementation, the hybrid dimming strategy parameters further include a color enhancement coefficient; determining the target brightness corresponding to each color channel of at least one backlight zone in the display panel in a first color space based on the image to be displayed includes: Determine the image area corresponding to each of the backlight zones in the image to be displayed; Based on the color channel values ​​of each pixel in each image region in the first color space, determine the initial target brightness corresponding to each color channel in each backlight partition; Based on the color enhancement coefficient, the initial target brightness corresponding to each color channel in each of the backlight zones is adjusted to obtain the target brightness corresponding to each color channel in each of the backlight zones.

[0014] In this embodiment, by using a color enhancement coefficient to adjust the initial target brightness of each color channel in each backlight zone, it is beneficial to enhance the matching degree between the target brightness and the color requirements of the current scene, thereby improving the color performance of the displayed image.

[0015] In one possible implementation, the step of correcting the target brightness corresponding to any color channel in the first backlight partition based on the crosstalk compensation strength and the crosstalk coefficient corresponding to each color channel combination between each backlight partition, to obtain the driving brightness corresponding to any color channel, includes: Based on the crosstalk coefficients corresponding to each color channel combination between different backlight partitions, construct a sub-channel crosstalk coefficient matrix corresponding to each color channel combination. The color coupling matrix is ​​determined based on the crosstalk coefficient matrices of each channel. The target brightness corresponding to each color channel in each of the backlight zones is determined as the initial driving brightness estimate; Based on the color coupling matrix and the estimated driving brightness value corresponding to the current iteration round, determine the crosstalk amount corresponding to the current iteration round; Based on the crosstalk compensation strength and the crosstalk amount, determine the crosstalk compensation amount corresponding to the current iteration round; Based on the target brightness of each color channel in each backlight zone and the crosstalk compensation amount, determine the estimated driving brightness value for the next iteration round; After completing a preset number of iterations, the estimated drive brightness value corresponding to the last iteration is determined as the drive brightness of each color channel in each backlight partition.

[0016] In this embodiment, by establishing color coupling relationships between different backlight zones and different color channels, and iteratively correcting the driving brightness of each color channel in combination with crosstalk compensation intensity, it is beneficial to reduce the impact of inter-zone brightness crosstalk and color crosstalk on the display effect and improve the accuracy of backlight driving brightness.

[0017] In one possible implementation, the backlight driving signal includes a DC current control signal and a pulse width modulation signal; the DC current level includes a DC current level corresponding to each color channel; the step of outputting the backlight driving signal corresponding to any color channel in the first backlight partition according to the DC current level, the pulse width modulation frequency, and the driving brightness corresponding to any color channel in the first backlight partition includes: Based on the DC current level corresponding to each color channel, the reference DC current corresponding to each color channel is determined from a preset reference DC current lookup table. Based on the reference DC current, determine the DC current value corresponding to each color channel in each of the backlight zones; Based on the DC current value and the corresponding driving brightness, determine the pulse width modulation duty cycle corresponding to each color channel in each of the backlight zones; The DC current control signal is output according to the DC current value, and the pulse width modulation signal is output according to the pulse width modulation frequency and the pulse width modulation duty cycle.

[0018] In this embodiment, by determining the DC current level for each color channel and combining DC current dimming and pulse width modulation dimming to generate the corresponding backlight driving signal, it is beneficial to implement differentiated hybrid dimming according to the driving requirements of different color channels, thereby improving the flexibility of backlight driving.

[0019] In one possible implementation, the method further includes: Obtain the current correction coefficient corresponding to each color channel in each of the backlight partitions; Based on the scene type, determine the scene adjustment coefficient corresponding to each color channel; The step of determining the DC current value corresponding to each color channel in each of the backlight zones based on the reference DC current includes: The DC current value corresponding to each color channel in each backlight partition is determined based on the reference DC current and the scene adjustment coefficient corresponding to each color channel in each backlight partition, as well as the current correction coefficient corresponding to each color channel in each backlight partition.

[0020] In this implementation, by combining the scene adjustment coefficient and the current correction coefficient corresponding to each color channel in each backlight zone to determine the DC current value, it is beneficial to make the DC current adapt to the current display scene and the driving differences between different backlight zones and different color channels, thereby improving the accuracy of DC current control.

[0021] In one possible implementation, the current correction coefficient is predetermined by the following steps: Each color channel in each backlight zone is illuminated separately, and the measured brightness corresponding to each color channel in each backlight zone is obtained. The average brightness of the color channel is determined based on the measured brightness of the same color channel in each of the backlight zones. The current correction coefficient corresponding to the color channel in each backlight zone is determined based on the ratio of the average brightness to the measured brightness of the color channel in each backlight zone.

[0022] In this embodiment, by pre-determining the current correction coefficient based on the measured brightness and average brightness of the same color channel in each backlight zone, it is beneficial to compensate for the brightness differences between different backlight zones and color channels, thereby improving the consistency of backlight brightness.

[0023] In one possible implementation, after determining the pulse width modulation duty cycle corresponding to each color channel in each backlight zone based on the DC current value and the corresponding driving brightness, the method further includes: Determine whether the pulse width modulation duty cycle is within a preset duty cycle range; If the pulse width modulation duty cycle exceeds the preset duty cycle range, adjust the corresponding DC current level. The corresponding reference DC current is re-determined based on the adjusted DC current level, and the DC current value and the pulse width modulation duty cycle are re-determined based on the re-determined reference DC current, so that the re-determined pulse width modulation duty cycle is within the preset duty cycle range.

[0024] In this embodiment, by adjusting the DC current level when the pulse width modulation duty cycle exceeds the preset duty cycle range, the redefined pulse width modulation duty cycle is kept within the preset duty cycle range. This helps to avoid the adverse effects of excessively high or low duty cycles on dimming efficiency and adjustment margin, and improves the stability of hybrid dimming.

[0025] A second aspect of this application provides a backlight control device, the device comprising: The image acquisition module is used to acquire the image to be displayed. The scene recognition module is used to determine the scene type corresponding to the image to be displayed based on the image features of the image to be displayed; The strategy determination module is used to determine the hybrid dimming strategy parameters corresponding to the scene type based on the scene type. The hybrid dimming strategy parameters include at least: DC current level, pulse width modulation frequency, and crosstalk compensation strength. The target brightness determination module is used to determine the target brightness of each color channel of at least one backlight zone in the display panel in the first color space based on the image to be displayed. The correction module is used to correct the target brightness corresponding to any color channel in the first backlight partition according to the crosstalk compensation strength and the crosstalk coefficient corresponding to each color channel combination between each backlight partition, so as to obtain the driving brightness corresponding to any color channel. The first backlight partition is any one of at least one of the backlight partitions. The backlight driving module is used to output a backlight driving signal corresponding to any of the color channels according to the DC current level, the pulse width modulation frequency and the driving brightness corresponding to any of the color channels.

[0026] A third aspect of the embodiments of this application provides a backlight module, the backlight module including a light-emitting unit array and a backlight driving unit; The light-emitting unit array includes multiple backlight zones arranged in an array, and each backlight zone includes at least one set of red light-emitting units, green light-emitting units and blue light-emitting units; The backlight driving circuit is connected to each of the light-emitting units and is used to execute the backlight control method as described in any of the embodiments of the first aspect above.

[0027] A fourth aspect of this application provides a display device, the display device including a display panel and a backlight module as described in the fourth aspect, the backlight module being disposed on the backlight side of the display panel.

[0028] A fifth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the backlight control method described in the first aspect.

[0029] A sixth aspect of this application provides a computer program product that, when run on a display device, causes the display device to execute the backlight control method described in the first aspect.

[0030] The beneficial effects of the second to sixth aspects mentioned above can all be referred to the beneficial effects described in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic flowchart of a backlight control method provided in an embodiment of this application; Figure 2 This is a schematic diagram of the scene recognition process provided in an embodiment of this application; Figure 3 This is a flowchart illustrating the crosstalk compensation iterative process provided in an embodiment of this application; Figure 4 This is a schematic flowchart of the hybrid dimming drive process provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a backlight control device provided in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of a backlight module provided in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of a display device provided in an embodiment of this application; The meanings of the reference numerals in the attached figures are as follows: 600 - Backlight module; 601 - Light-emitting unit array; 602 - Backlight driving unit; 700 - Display device; 710 - Controller; 720 - Memory; 721 - Computer program; 730 - Display panel. Detailed Implementation

[0033] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0034] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0035] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0036] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0037] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] It should be understood that the sequence number of each step in this embodiment does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this application embodiment.

[0039] Mini-LED (Mini Light Emitting Diode) backlight technology features small size, high brightness, and ease of localized control. Among these, RGB (Red, Green, and Blue) tri-color backlight technology allows for the adjustment of backlight brightness and color by controlling the light-emitting units of different colors, thereby improving the color gamut, color accuracy, and contrast of display devices. As displayed content becomes increasingly diverse, different types of display screens place different demands on backlight control.

[0040] However, existing backlight control technologies have limited adaptability to complex display content, and are prone to problems such as color cast, insufficient color performance, and halo effects in different display scenarios, and it is difficult to balance different display effects. Therefore, how to improve the adaptability of backlight control to improve the overall display effect in different display scenarios is a technical problem that urgently needs to be solved in current backlight control technology.

[0041] To address the aforementioned issues, this application provides a backlight control method, a backlight module, and a display device. This method acquires an image to be displayed and determines the corresponding scene type based on the image features, thus identifying the display scene characteristics of the current image. Further, it determines the corresponding DC current level, pulse width modulation frequency, and crosstalk compensation intensity based on the scene type, ensuring that the hybrid dimming strategy parameters match the current display scene. On this basis, it determines the target brightness corresponding to each color channel in each backlight zone based on the image to be displayed, obtaining the zone and color brightness requirements corresponding to the image content. Further, it corrects the target brightness by combining the crosstalk coefficient and crosstalk compensation intensity corresponding to the color channel combinations between each backlight zone, reducing the impact of crosstalk between different backlight zones and color channels on the actual output brightness, resulting in a driving brightness that better meets the target display requirements. Finally, it outputs a corresponding backlight driving signal based on the DC current level, pulse width modulation frequency, and driving brightness, achieving backlight driving control adapted to the current display scene and backlight zone brightness requirements. This improves the adaptability of backlight control to different display scenes and enhances the overall display effect under different display scenarios.

[0042] The following detailed description, with reference to the figures, describes the backlight control method, apparatus, system, backlight module, display device, display equipment, computer-readable storage medium, and computer program product proposed in this application.

[0043] See Figure 1 The diagram illustrates a flowchart of a backlight control method provided in an embodiment of this application; specifically, as shown... Figure 1 As shown, the method may include the following steps: S101, Obtain the image to be displayed.

[0044] The image to be displayed refers to the image data that needs to be displayed by the display panel and used to generate the corresponding backlight control values. The image to be displayed can be the current frame image data received by the display device.

[0045] Specifically, when performing backlight control, the current frame image data can be received first, and the current frame image data can be used as the image to be displayed for subsequent scene recognition, partition brightness calculation and backlight drive control.

[0046] For example, in an RGB Mini-LED backlit LCD display device, a frame of RGB image data corresponding to the current display cycle can be received and used as the image to be displayed.

[0047] S102, determine the scene type corresponding to the image to be displayed based on the image characteristics of the image to be displayed.

[0048] Image features refer to image information that can reflect the color, texture, salient areas, or inter-frame changes of the image to be displayed, and can be used to distinguish the characteristics of different display content.

[0049] Scene type refers to the scene category determined based on the characteristics of the image content to be displayed. Different scene types correspond to different backlight control requirements.

[0050] Specifically, image information can be extracted from the image to be displayed, and scene classification can be performed based on the extracted image information, thereby determining the scene type that matches the current image to be displayed from a number of pre-set scene types.

[0051] For example, relevant information reflecting the image content can be extracted from the current frame image, and the current frame can be classified into one of the pre-set scene types based on the extracted information, so that the corresponding hybrid dimming strategy parameters can be selected later.

[0052] For example, in one possible implementation, the scene type may include a first scene type, a second scene type, a third scene type, and a fourth scene type. As an example, the first scene type may correspond to a scene with a high-saturation solid color background and a small area of ​​light-colored objects, i.e., Type A scene, and can be further divided into Type A1, Type A2, and Type A3 based on the dominant color. Specifically, Type A1 is a scene with a high-red background and light-colored objects, such as a red rose background with white water droplets; Type A2 is a scene with a high-green background and light-colored objects; and Type A3 is a scene with a high-blue background and light-colored objects. The second scene type may correspond to a multi-color, high-dynamic scene, i.e., Type B scene. Type B1 can be a high-dynamic, high-saturation scene, and Type B2 can be a natural landscape scene, with examples including natural landscapes and city night scenes. The third scene type may be Type C, i.e., a low-brightness, dark scene, such as a starry sky or night scene with low overall brightness. The fourth scene type may be Type D, i.e., a motion scene, such as a sports event, action movie, or racing game containing moving objects.

[0053] To facilitate the extraction of image information that characterizes different scene features from the image to be displayed, color space conversion can be performed on the image. For details, please refer to... Figure 2 The diagram illustrates the scene recognition process. In one possible implementation, the method further includes: Convert the image to be displayed from the first color space to the second color space; Extract at least one of the following as image features from the image to be displayed in the second color space: color distribution features, spatial frequency features, saliency features, and temporal domain features; Based on the image features of the image to be displayed, determine the scene type corresponding to the image to be displayed, including: The scene type corresponding to the image to be displayed is determined based on at least one of the following: color distribution characteristics, spatial frequency characteristics, saliency characteristics, and temporal domain characteristics.

[0054] In this implementation, the first color space refers to the color representation space used by the image to be displayed before entering the scene recognition process. In one example, the first color space can be the RGB color space. The second color space refers to the color representation space used for image feature extraction of the image to be displayed. In one example, the image to be displayed in the RGB color space can be converted to the YCbCr color space to obtain the image to be displayed in the second color space.

[0055] In this context, a color channel refers to a channel in a color space used to represent different color components. In the RGB color space, color channels can include red, green, and blue channels.

[0056] Specifically, such as Figure 2 As shown, the image to be displayed can be obtained first in the RGB color space and then converted to the second color space. Then, at least one of the following features can be extracted from the converted image: color distribution features, spatial frequency features, saliency features, and time domain features. The extracted image features are then fused and classified to determine the scene type corresponding to the image to be displayed.

[0057] For example, when performing scene recognition on a frame of RGB image, the frame can be converted to the YCbCr color space first, and then information such as color distribution, spatial frequency and salient regions of the frame can be extracted; when it is necessary to determine the motion scene, the change information between the frame and adjacent temporally connected images can also be combined for classification.

[0058] In one possible implementation, the color distribution feature is used to characterize the proportion and spatial distribution of different colors in the pixel range of the image to be displayed, and can be determined based on the color channel values ​​of each pixel in the image to be displayed.

[0059] Spatial frequency features are used to characterize how quickly brightness or color changes with spatial location in an image to be displayed, and can be used to distinguish between flat regions and textured regions. Specifically, they can be determined based on the edge density and the proportion of high-frequency components in the image to be displayed. Edge density refers to the density of edge information in the image to be displayed, which can be obtained through image edge calculation to distinguish between flat regions and textured regions in the image. The proportion of high-frequency components refers to the proportion of high-frequency image components in the corresponding frequency domain information of the image to be displayed, which can be obtained through Fourier transform or wavelet transform.

[0060] Saliency features are used to characterize information about salient regions in an image that stand out more than the background. They can be determined based on the location and size of the salient region and the color difference between the salient region and the background region. The salient region refers to the area containing a salient object identified from the image through region detection.

[0061] Temporal domain features are used to characterize the changes between temporally adjacent images, reflecting the presence of motion and corresponding motion changes within the images; that is, they can be used to characterize motion direction and speed. Specifically, temporal domain features can be determined based on the inter-frame differences between the image to be displayed and its temporally adjacent images. These inter-frame differences refer to the image differences between the image to be displayed and its temporally adjacent images.

[0062] Specifically, color distribution information can be obtained based on pixel color channel values; edge density can be obtained through image edge calculation, and the proportion of high-frequency components can be obtained through Fourier transform or wavelet transform; the position and size of salient objects can be obtained through region detection, and the color difference between salient regions and background regions can be calculated; when it is necessary to extract time domain features, the difference between the current frame and adjacent frames can also be calculated.

[0063] In one possible implementation, the scene type corresponding to the image to be displayed is determined based on the image features of the image to be displayed, including: When the color distribution features meet the first condition, the image to be displayed is determined to correspond to a first scene type. The first condition includes: the proportion of pixels corresponding to the dominant color is greater than a preset dominant color proportion threshold, the proportion of the highly saturated pixel area is greater than a preset saturation proportion threshold, and the light-colored pixel area exists. The hybrid dimming strategy parameters corresponding to the first scene type include: a first DC current level, a first pulse width modulation frequency, and a first crosstalk compensation strength; The first DC current setting is used to determine the first reference DC current of the color channel corresponding to the dominant color from a preset reference DC current lookup table. The first reference DC current is less than the preset reference DC current. The first pulse width modulation frequency is higher than the preset reference pulse width modulation frequency; The first crosstalk compensation strength is used to adjust the crosstalk amount determined based on the crosstalk coefficients corresponding to the color channel combinations between adjacent backlight zones, so as to determine the crosstalk compensation amount between adjacent backlight zones.

[0064] In this embodiment, the pixel percentage corresponding to the dominant color refers to the ratio between the number of pixels corresponding to the dominant single color in the image to be displayed and the total number of pixels in the image to be displayed.

[0065] Here, light-colored pixel regions refer to image regions formed by light-colored or white pixels. In one example, pixels whose R, G, and B color channel values ​​are all higher than a preset grayscale threshold can be identified as light-colored pixels. High-saturation pixel regions refer to image regions formed by pixels with high color saturation. For any pixel, its color saturation S can be determined according to the following formula: S = 1 - min(R, G, B) / max(R, G, B) Here, R, G, and B represent the color channel values ​​of the corresponding pixel in the red, green, and blue channels, respectively. In one example, pixels with S greater than 0.8 can be identified as highly saturated pixels, and the proportion and distribution of highly saturated pixel regions can be statistically analyzed.

[0066] In the embodiments of this application, a backlight partition refers to an area in the backlight module that can be controlled relatively independently for backlight driving. A backlight module may include multiple backlight partitions.

[0067] The crosstalk coefficient is a parameter used to characterize the degree to which the emission of a certain color channel in one backlight zone has an optical impact on a certain color channel in another backlight zone. Because the diffusion characteristics of RGB light are different, different combinations of color channels can each have a corresponding crosstalk coefficient.

[0068] Specifically, the color distribution of the image to be displayed in the RGB color space can be statistically analyzed to detect the existence of a dominant single color; simultaneously, light-colored pixel areas are detected, and high-saturation pixel areas are determined based on the color saturation of each pixel. When the proportion of pixels corresponding to the dominant color, the proportion of high-saturation pixel areas, and the light-colored pixel areas meet the corresponding judgment conditions, the image to be displayed can be determined as a first scene type, and a corresponding first DC current level, first pulse width modulation frequency, and first crosstalk compensation intensity can be determined for this first scene type.

[0069] For example, in one specific example, a pixel percentage corresponding to the dominant color greater than 60% can be used as a criterion for determining the presence of a clearly dominant color. Pixels with R, G, and B color channel values ​​all greater than 200 gray levels are considered light-colored pixels, and the aforementioned color saturation formula is used to identify highly saturated pixels with an S value greater than 0.8. For an image with a small area of ​​white objects against a large area of ​​highly saturated red background, such as an image of white water droplets on a red rose, it can be identified as a high-red background scene in the first scene type. In this case, the DC current level of the red channel corresponding to the dominant color can be reduced, the pulse width modulation frequency can be increased, and a stronger crosstalk compensation intensity can be used to reduce the reddish tint of light-colored areas caused by red light crosstalk between adjacent zones.

[0070] In one possible implementation, the scene type may also include multi-color high dynamic range scenes, low-brightness dark scene scenes, and motion scenes.

[0071] Among them, multi-color high dynamic range scenes refer to scenes in which the image contains multiple colors and has a high dynamic range, such as natural landscapes or urban night scenes. Such scenes have high requirements for color vibrancy and contrast.

[0072] Low-brightness dark scene refers to a scene with low overall display brightness, such as a starry sky or night scene. Such scenes have high requirements for halo control.

[0073] Among them, motion scenes refer to scenes where the image content involves continuous or rapid motion, such as sports events or action movies. These scenes have high requirements for the response speed of backlight control.

[0074] Specifically, after image feature extraction is completed, the image to be displayed can be classified into a scene type that matches its image content based on information such as color distribution, spatial frequency, salient regions, and temporal domain changes.

[0075] For example, natural landscape images with rich colors and high dynamic range can be identified as multi-color high dynamic scenes; starry sky images with low overall brightness can be identified as low-brightness dark scenes; and sports event images with significant inter-frame variations can be identified as motion scenes by combining temporal domain features.

[0076] It should be understood that different scene types correspond to different hybrid dimming strategy parameters.

[0077] In one possible implementation, the hybrid dimming strategy parameters corresponding to the scene type are determined based on the scene type, including: When the image to be displayed corresponds to at least two scene types, determine the weight corresponding to each scene type; Based on the weights corresponding to each scene type and the hybrid dimming strategy parameters corresponding to each scene type, the hybrid dimming strategy parameters corresponding to the image to be displayed are determined.

[0078] Among them, a mixed-type scene refers to a scene in which the same image to be displayed simultaneously has image features corresponding to at least two scene types.

[0079] The percentage of scene type in the image to be displayed refers to the relative proportion of the image content covered by the corresponding scene features in the image to be displayed.

[0080] The weight can be a parameter determined based on the proportion of each scene type in the image to be displayed, used to characterize the relative influence of each scene type in the current image to be displayed, or it can be a preset weight value.

[0081] Specifically, when the image to be displayed simultaneously satisfies at least two scene types, the proportion of each scene type in the image to be displayed can be determined, the corresponding weight can be obtained based on the proportion, and then combined with the pre-corresponding hybrid dimming strategy parameters for each scene type, the final hybrid dimming strategy parameters to be used for the current image to be displayed can be determined.

[0082] For example, when the image to be displayed has the characteristics of both a high-red background scene and a motion scene, the proportions of the high-red background scene and the motion scene in the image to be displayed can be determined separately. Based on the two proportions, the corresponding weights are obtained. By weighting the values ​​of the hybrid dimming strategy parameters corresponding to the two scenes respectively, the hybrid dimming strategy parameters corresponding to the current image to be displayed can be determined.

[0083] S103. Based on the scene type, determine the hybrid dimming strategy parameters corresponding to the scene type. The hybrid dimming strategy parameters include at least: DC current level, pulse width modulation frequency, and crosstalk compensation strength.

[0084] Among them, the hybrid dimming strategy parameters refer to a set of control parameters determined according to the current scene type, used to control the backlight module to perform DC dimming and pulse width modulation dimming and implement crosstalk compensation.

[0085] Specifically, a correspondence between scene types and hybrid dimming strategy parameters can be established in advance. After determining the scene type corresponding to the current image to be displayed, the DC current level, pulse width modulation frequency, and crosstalk compensation intensity corresponding to the current scene type are determined from the pre-established scene parameter relationship, and the determined parameters are used for subsequent backlight brightness correction and hybrid dimming drive.

[0086] For example, after determining that the image to be displayed belongs to a motion scene, the corresponding DC current level, pulse width modulation frequency and crosstalk compensation intensity can be determined from the predefined strategy corresponding to the motion scene, and the determined parameters are provided to the subsequent backlight brightness correction and driving calculation process.

[0087] In one exemplary implementation, a high-red background scene can correspond to a low-level DC current setting for the red channel, a medium-level setting for the green channel, and a medium-level setting for the blue channel, with a pulse width modulation frequency of 2kHz and a strong crosstalk compensation strength; a high-green background scene can correspond to a medium-level red channel, a low-level green channel, and a medium-level blue channel, with a pulse width modulation frequency of 2kHz and a strong crosstalk compensation strength; a high-blue background scene can correspond to a medium-level red channel, a medium-level green channel, and a low-level blue channel, with a pulse width modulation frequency of 2kHz and a strong crosstalk compensation strength; a high-dynamic-range, high-saturation scene can correspond to a high-level color channel, 1kHz, and a medium crosstalk compensation strength; a natural landscape scene can correspond to a medium-level color channel, 1.5kHz, and a relatively weak crosstalk compensation strength; a low-brightness, dark scene can correspond to a low-level color channel, 3kHz, and a relatively weak crosstalk compensation strength; and a motion scene can correspond to a medium-level color channel, 4kHz, and a medium crosstalk compensation strength. The above parameter values ​​illustrate that different scene types can correspond to different hybrid dimming strategy parameters.

[0088] S104, based on the image to be displayed, determine the target brightness corresponding to each color channel of at least one backlight zone in the display panel in the first color space.

[0089] Here, target brightness refers to the desired backlight brightness determined based on the image content of the image to be displayed for the corresponding backlight partition and color channel. For partition i and color channel c, the corresponding target brightness can be represented as L_tgt(i,c), where c∈{R,G,B}.

[0090] Specifically, the target brightness of each backlight zone in the display panel under the red, green and blue channels can be calculated according to the image content of the image to be displayed, thereby forming the target backlight brightness of each backlight zone corresponding to the color.

[0091] For example, for any backlight zone i, the target brightness L_tgt(i,R) of the red channel, the target brightness L_tgt(i,G) of the green channel, and the target brightness L_tgt(i,B) of the blue channel can be obtained respectively, and the above target brightness is used as the brightness input for subsequent crosstalk compensation.

[0092] In one possible implementation, determining the target brightness of each color channel of at least one backlight zone in the display panel in a first color space, based on the image to be displayed, includes: Determine the corresponding image area of ​​each backlight zone in the image to be displayed; Based on the color channel values ​​of each pixel in each image region in the first color space, determine the target brightness corresponding to each color channel in each backlight zone.

[0093] The image region refers to the pixel region in the image to be displayed that has a partition mapping relationship with the corresponding backlight partition.

[0094] The target brightness can be understood as the expected backlight brightness of the corresponding color channel in the backlight partition, determined based on the image content of the corresponding image area. When the first color space is RGB, each backlight partition can correspond to the target brightness of the red, green, and blue channels, respectively.

[0095] In practice, for any backlight partition, the color channel values ​​of each pixel within the corresponding image area can be obtained, and the target brightness corresponding to each color channel in the backlight partition can be determined based on the color channel values. Thus, the target brightness of the R, G, and B color channels can be obtained for each backlight partition, and these can be used as input for subsequent crosstalk compensation processing.

[0096] For example, for the first For each backlight zone, the image area corresponding to that backlight zone in the image to be displayed can be determined first. Then, based on the R, G, and B color channel values ​​of each pixel in that image area, the target brightness of the red channel of that backlight zone can be determined. Green channel target brightness and blue channel target brightness In this embodiment, the brightness of each color channel determined according to the corresponding image region can be directly used as the corresponding target brightness.

[0097] In another possible implementation, the hybrid dimming strategy parameters further include a color enhancement coefficient; determining the target brightness corresponding to each color channel of at least one backlight zone in the display panel in a first color space, based on the image to be displayed, includes: Determine the corresponding image area of ​​each backlight zone in the image to be displayed; Based on the color channel values ​​of each pixel in each image region in the first color space, determine the initial target brightness corresponding to each color channel in each backlight partition; Based on the color enhancement factor, the initial target brightness corresponding to each color channel in each backlight zone is adjusted to obtain the target brightness corresponding to each color channel in each backlight zone.

[0098] The initial target brightness refers to the brightness of the partitioned color channel determined based on the color channel values ​​of each pixel in the corresponding image area before color enhancement adjustments are performed.

[0099] The color enhancement factor is a strategy parameter used to adjust the initial target brightness of different color channels in each backlight zone. It can be determined according to the scene type to adapt to the color performance requirements of different scenes.

[0100] Specifically, the image area corresponding to each backlight partition in the image to be displayed can be determined according to the partition mapping relationship between the display panel and the backlight module; the pixel color channel values ​​in each image area are statistically analyzed to obtain the initial target brightness corresponding to the red, green and blue color channels in each backlight partition; then the initial target brightness is adjusted using the color enhancement coefficient corresponding to the current scene type to obtain the target brightness used for subsequent crosstalk compensation.

[0101] For example, in scenes with a high-saturation solid color background and light-colored objects, the color enhancement coefficient can be set to a low level to avoid oversaturation; in high-dynamic, high-saturation scenes, the color enhancement coefficient can be set to a high level; in natural landscape scenes, a medium color enhancement level can be used; and in low-brightness dark scenes and motion scenes, a standard color enhancement level can be used. S105, based on the crosstalk compensation intensity and the crosstalk coefficient corresponding to each color channel combination between each backlight zone, the target brightness corresponding to any color channel in the first backlight zone is corrected to obtain the driving brightness corresponding to any color channel.

[0102] Among them, driving brightness refers to the actual driving brightness determined in order to make the corresponding backlight zone meet the target display requirements after taking into account the optical crosstalk between backlight zones.

[0103] The first backlight partition is used to represent any one of the at least one backlight partitions, but it does not limit the specific location of the first backlight partition in the backlight module.

[0104] Specifically, the crosstalk coefficients corresponding to the color channel combinations between the first backlight zone and other backlight zones can be used to determine the crosstalk effect of the emission from other backlight zones on the target color channel in the first backlight zone. The target brightness can then be corrected by combining the crosstalk compensation intensity corresponding to the current scene type to obtain the driving brightness of any color channel.

[0105] For example, when a large area of ​​highly saturated red background coexists with adjacent light-colored areas, the red light from the backlight zone corresponding to the red background will affect the adjacent backlight zone corresponding to the light-colored area through optical diffusion, causing the light-colored area to appear reddish. In this case, the crosstalk effect can be determined based on the crosstalk coefficient of the red channel and other color channels between adjacent backlight zones, and the target brightness of the adjacent zones can be corrected by combining the crosstalk compensation intensity of the current scene.

[0106] In one possible implementation, see Figure 3 The diagram illustrates a flowchart of the crosstalk compensation iterative process provided in an embodiment of this application. Figure 3 As shown, step S105 above may include: Based on the crosstalk coefficients of each color channel combination between different backlight zones, construct the sub-channel crosstalk coefficient matrix corresponding to each color channel combination; The color coupling matrix is ​​determined based on the crosstalk coefficient matrix of each sub-channel; The target brightness corresponding to each color channel in each backlight zone is determined as the initial driving brightness estimate; Based on the color coupling matrix and the estimated driving brightness value corresponding to the current iteration round, determine the crosstalk amount corresponding to the current iteration round; Based on the crosstalk compensation strength and crosstalk amount, determine the crosstalk compensation amount corresponding to the current iteration round; Based on the target brightness and crosstalk compensation amount of each color channel in each backlight zone, determine the estimated value of the driving brightness for the next iteration. After completing a preset number of iterations, the estimated drive brightness value corresponding to the last iteration is determined as the drive brightness of each color channel in each backlight partition.

[0107] Each sub-channel crosstalk coefficient matrix corresponds to a color channel combination, which includes a crosstalked color channel and an emitting color channel. The crosstalked color channel and the emitting color channel are selected from the red channel, green channel, and blue channel, respectively. For example, crosstalk coefficient matrices corresponding to color channel combinations such as red channel to red channel, green channel to red channel, and blue channel to red channel can be formed.

[0108] The color coupling matrix is ​​a matrix formed by combining the crosstalk coefficient matrices corresponding to each color channel combination. It is used to characterize the optical coupling relationship between different color channels in each backlight zone. Hereinafter, C represents the color coupling matrix.

[0109] Among them, the driving brightness estimate refers to the driving brightness estimate result of each color channel of each backlight partition used in the current iteration round during the crosstalk compensation iteration process.

[0110] Crosstalk refers to the amount of brightness influence that is coupled from other backlight zones and color channels to the current backlight zone color channel, calculated based on the estimated driving brightness value and color coupling matrix of the current iteration.

[0111] Among them, the crosstalk compensation amount refers to the brightness amount used to compensate and correct the target brightness, which is determined based on the crosstalk amount and crosstalk compensation intensity corresponding to the current iteration round.

[0112] The preset number of iterations refers to the number of crosstalk compensation iterations set in advance. In one example, 3 to 5 iterations can be performed.

[0113] Specifically, assume the backlight module comprises M×N backlight zones. For the i-th backlight zone, the crosstalk brightness received by its red channel from the emission of the R, G, and B color channels of each backlight zone can be expressed as:

[0114] in, This represents the crosstalk coefficient that affects the red channel emission of the j-th backlight zone on the red channel of the i-th backlight zone. The crosstalk coefficient represents the effect of the green channel emission of the j-th backlight zone on the red channel of the i-th backlight zone. The crosstalk coefficient represents the effect of the blue channel emission of the j-th backlight zone on the red channel of the i-th backlight zone.

[0115] in, , , These represent the actual luminous intensity of the red, green, and blue light-emitting units in the j-th backlight zone, respectively. Similarly, the crosstalk relationship between the green and blue channels of the i-th backlight zone can be obtained.

[0116] Specifically, it can be based on , 、 、 、 、 、 、 and Construct the corresponding sub-channel crosstalk coefficient matrix, and further combine the sub-channel crosstalk coefficient matrices into a color coupling matrix C, for example:

[0117] Among them, the color coupling matrix C can be a sparse matrix. For backlight zones that are far apart and whose optical crosstalk can be ignored, the corresponding crosstalk coefficient can be zero or not constitute a valid non-zero element. The non-zero crosstalk coefficient mainly corresponds to the backlight zones that are close to each other.

[0118] For ease of description, the target brightness corresponding to each color channel can be written as a target backlight brightness vector. Write the corresponding driving brightness as a driving brightness vector. ,For example:

[0119]

[0120] in, , and These represent the target brightness corresponding to the red, green, and blue channels, respectively. , and These represent the driving brightness corresponding to the red, green, and blue channels, respectively. For multiple backlight zones, the brightness of each color channel in each backlight zone can be arranged in the same way to form a corresponding vector.

[0121] Specifically, such as Figure 3 As shown, at the start of the iteration, the target brightness corresponding to each color channel in each backlight partition can be determined as the initial driving brightness estimate, that is:

[0122] For the In each iteration, the color coupling matrix C and the estimated driving brightness value corresponding to the current iteration can be used as a reference. Determine the crosstalk amount corresponding to the current iteration round. :

[0123] Furthermore, based on the crosstalk compensation strength Adjust the crosstalk amount corresponding to the current iteration round to determine the crosstalk compensation amount corresponding to the current iteration round. :

[0124] in, The crosstalk compensation intensity represents the crosstalk compensation intensity corresponding to the current scene type, which is used to adjust the degree of compensation for the calculated crosstalk amount; the crosstalk coefficient between each backlight zone is used to characterize the optical crosstalk relationship after the backlight module is formed, and the crosstalk compensation intensity is used to apply to the crosstalk amount without changing the crosstalk coefficient.

[0125] Subsequently, based on the target brightness Crosstalk compensation amount corresponding to the current iteration round Update the driving brightness estimate for the next iteration round. :

[0126] Repeat the above process of crosstalk calculation, crosstalk compensation determination, and drive brightness estimate update, until a preset number of times is completed. After iteration, the estimated driving brightness value corresponding to the last iteration round can be obtained. The driving brightness is determined as the corresponding color channel in each backlight zone.

[0127] For example, in a high-red background scene, the adjacent backlight zones corresponding to light-colored objects can be constructed first based on the crosstalk coefficients corresponding to the combination of red light and other color channels. Then, the target brightness is used as the initial driving brightness estimate for multiple iterations. In each iteration, the crosstalk amount is calculated based on the current driving brightness estimate, and the crosstalk compensation amount is determined using the crosstalk compensation intensity corresponding to the current scene, until the preset number of iterations is completed, thereby obtaining the driving brightness used to actually drive the R, G, and B color channels of each backlight zone.

[0128] S106 outputs the backlight drive signal corresponding to any color channel based on the DC current level, pulse width modulation frequency, and drive brightness corresponding to any color channel.

[0129] Among them, the backlight drive signal refers to the drive signal used to control the light emission of the corresponding backlight zones and color channels in the backlight module.

[0130] Specifically, after obtaining the driving brightness of each color channel in each backlight zone, the corresponding backlight driving signal for the backlight zone and color channel can be generated by combining the DC current level and pulse width modulation frequency corresponding to the current scene type, and the backlight driving signal can be output to the backlight driving unit to drive the RGB Mini-LED to emit light.

[0131] For example, for the red channel of a certain backlight zone, a corresponding backlight driving signal can be generated based on the DC current level of the red channel, the pulse width modulation frequency corresponding to the current scene, and the red channel driving brightness obtained after crosstalk compensation, and then output to the corresponding LED driving circuit.

[0132] In one possible implementation, the backlight driving signal includes a DC current control signal and a pulse width modulation signal; the DC current level includes the DC current level corresponding to each color channel; the above step S106 includes: Based on the DC current level corresponding to each color channel, determine the reference DC current corresponding to each color channel from the preset reference DC current lookup table; Based on the reference DC current, determine the DC current value corresponding to each color channel in each backlight zone; Based on the DC current value and the corresponding driving brightness, determine the pulse width modulation duty cycle corresponding to each color channel in each backlight zone; The DC current control signal is output based on the DC current value, and the pulse width modulation signal is output based on the pulse width modulation frequency and pulse width modulation duty cycle.

[0133] Among them, the DC current control signal refers to the control signal used to control the DC drive current value of the corresponding color channel in the corresponding backlight zone.

[0134] Among them, pulse width modulation signal refers to the periodic drive signal output according to the corresponding pulse width modulation frequency and pulse width modulation duty cycle.

[0135] The reference DC current refers to the reference current value associated with the corresponding color channel and DC current level, which can be looked up using a preset reference DC current lookup table. For color channel c, the corresponding reference DC current can be expressed as... .

[0136] The pulse width modulation duty cycle refers to the proportion of time during which the pulse width modulation signal is in an effective driving state within one cycle to the total time of that cycle.

[0137] in, This indicates the luminous efficiency of the light-emitting unit corresponding to color channel c. The luminous efficiency can be initialized and recorded before the device leaves the factory.

[0138] Specifically, for partition i and color channel c, the reference DC current can be queried based on the DC current range corresponding to color channel c, and the DC current value I for that partition and color channel can be determined accordingly. DC (i,c); then based on the DC current value and the corresponding driving brightness L drv (i,c) Determine the pulse width modulation duty cycle D PWM (i,c). In one implementation, the pulse width modulation duty cycle can be determined according to the following formula:

[0139] Where i represents the backlight zone, c represents the color channel, and c∈{R,G,B}; L drv (i,c) represents the driving brightness corresponding to color channel c in partition i; DC (i,c) represents the DC current value corresponding to color channel c in partition i.

[0140] In one exemplary color-based color allocation method, corresponding DC current levels and pulse width modulation parameters can be set according to the different characteristics of the R, G, and B color emitting units. For example, a red emitting unit can use a lower DC current and a higher pulse width modulation duty cycle to obtain the required equivalent brightness; a green emitting unit can use a medium DC current and a medium-high pulse width modulation frequency; and a blue emitting unit can use a higher DC current and a lower pulse width modulation duty cycle. The above color allocation method is a specific example and does not limit the use of a fixed level relationship for each color channel in different scenarios.

[0141] In one possible implementation, the method further includes: Obtain the current correction coefficient for each color channel in each backlight zone; Determine the scene adjustment coefficient for each color channel based on the scene type; Based on the reference DC current, determine the DC current value corresponding to each color channel in each backlight zone, including: Based on the reference DC current and scene adjustment coefficient corresponding to each color channel, and the current correction coefficient corresponding to each color channel in each backlight zone, determine the DC current value corresponding to each color channel in each backlight zone.

[0142] The scene adjustment coefficient is a coefficient determined according to the current scene type and used to adjust the reference DC current of the corresponding color channel for scene adaptation. It can be represented as α(c).

[0143] The current correction factor is a correction factor determined for the brightness differences of different backlight zones and color channels, which can be expressed as γ(i,c), where i represents the backlight zone and c represents the color channel.

[0144] Specifically, for partition i and color channel c, the corresponding reference DC current I can be used. base (c) The actual DC current value I is determined by the scene adjustment coefficient α(c) and the current correction coefficient γ(i,c). DC (i,c):

[0145] Specifically, the scene adjustment coefficient can be set according to different scene types. Taking the specific settings in the briefing plan as an example, in a scene with a high-red background and containing light-colored objects, α... R It can be 0.6, α G and α B It can be 1; in a scene with a high green background and containing light-colored objects, α R It can be 1, α G It can be 0.6, α B It can be 1; in a scene with a high blue background and containing light-colored objects, α R It can be 1, α G It can be 1, α B It can be 0.6; in high-dynamic, high-saturation scenarios, α R α G and α B Both can be 1.2; in natural landscape scenes, α R α G and α B Both can be 1; in low-brightness, dark scenes, α R α G and αB Both can be 0.8; in motion scenarios, α R α G and α B Both can be 1.1.

[0146] For example, in a scene with a high-red background and light-colored objects, α can be used. R =0.6 reduces the DC current corresponding to the red channel, while keeping the scene adjustment coefficients for the green and blue channels at 1, so that the DC current of different color channels matches the current scene requirements.

[0147] In this embodiment, the current correction factor is predetermined through the following steps: Light up each color channel in each backlight zone separately, and obtain the measured brightness of each color channel in each backlight zone. The average brightness of the color channel is determined based on the measured brightness of the same color channel in each backlight zone. The current correction coefficient for each color channel in each backlight zone is determined based on the ratio of the average brightness to the measured brightness of the color channel in each backlight zone.

[0148] The measured brightness refers to the brightness value measured by the optical sensor when the corresponding color channel of the corresponding backlight zone is illuminated individually during the calibration phase. It can be expressed as L. measured (i,c).

[0149] The average brightness refers to the brightness benchmark obtained by averaging the measured brightness of each backlight zone for the same color channel, which can be represented as L(c).

[0150] Specifically, during the production line calibration phase, each color in each backlight zone can be individually illuminated, and the corresponding measured brightness can be recorded using an optical sensor. Assuming the number of backlight zones is N, for color channel c, the average brightness L(c) corresponding to all backlight zones can be calculated using the following formula:

[0151] Furthermore, the average brightness L(c) can be compared with the measured brightness L corresponding to color channel c in the i-th backlight partition. measured The ratio between (i,c) determines the current correction coefficient γ(i,c) for that color channel in that backlight zone:

[0152] For example, the red light-emitting units of all backlight zones can be lit up individually in sequence, and the measured red brightness of each backlight zone can be recorded. The average brightness of the red channel can be obtained based on the measured red brightness of all backlight zones. Then, the ratio between this average brightness and the measured red brightness of each backlight zone can be calculated to obtain the current correction coefficient corresponding to the red channel of each backlight zone. The green and blue channels can be calibrated in the same way.

[0153] In another possible implementation, after determining the pulse width modulation duty cycle corresponding to each color channel in each backlight zone based on the DC current value and the corresponding driving brightness, the method further includes: Determine whether the pulse width modulation duty cycle is within the preset duty cycle range; If the pulse width modulation duty cycle exceeds the preset duty cycle range, adjust the corresponding DC current level. The corresponding reference DC current is re-determined based on the adjusted DC current level, and the DC current value and pulse width modulation duty cycle are re-determined based on the re-determined reference DC current, so that the re-determined pulse width modulation duty cycle is within the preset duty cycle range.

[0154] The preset duty cycle range refers to the effective working range set for the pulse width modulation duty cycle, used to avoid the pulse width modulation duty cycle being too low or too high. In a specific example, the preset duty cycle range can be [0.1, 0.95].

[0155] Specifically, after calculating the pulse width modulation (PWM) duty cycle for each color channel in each backlight zone, it can be determined whether the calculated PWM duty cycle falls within the preset duty cycle range. When the PWM duty cycle exceeds this range, the DC current level of the corresponding color channel is adjusted, and the reference DC current is re-queried based on the adjusted DC current level. The actual DC current value and PWM duty cycle are then recalculated until the newly determined PWM duty cycle is within the preset duty cycle range.

[0156] For example, when the calculated pulse width modulation duty cycle of a certain color channel in a certain backlight zone is greater than 0.95 or less than 0.1, the corresponding DC current level can be adjusted, and the DC current value and pulse width modulation duty cycle can be recalculated based on the adjusted reference DC current to bring the pulse width modulation duty cycle back to the range of [0.1, 0.95], so as to avoid efficiency reduction and flickering caused by too low a duty cycle, and to avoid insufficient adjustment margin caused by too high a duty cycle.

[0157] The above method embodiments, by acquiring the image to be displayed and determining the corresponding scene type based on the image features of the image to be displayed, can identify the display scene characteristics of the current image to be displayed; further, based on the scene type, determine the corresponding DC current level, pulse width modulation frequency, and crosstalk compensation intensity, so that the hybrid dimming strategy parameters can match the current display scene; on this basis, based on the image to be displayed, determine the target brightness corresponding to each color channel in each backlight zone, so as to obtain the zone and color brightness requirements corresponding to the image content; further, combine the crosstalk coefficient and crosstalk compensation intensity corresponding to the combination of each color channel between each backlight zone to correct the target brightness, so as to reduce the impact of crosstalk between different backlight zones and color channels on the actual output brightness, and obtain a driving brightness that better meets the target display requirements; then, based on the DC current level, pulse width modulation frequency, and driving brightness, output the corresponding backlight driving signal to realize backlight driving control adapted to the current display scene and backlight zone brightness requirements, thereby improving the adaptability of backlight control to different display scenes and improving the overall display effect under different display scenes.

[0158] See Figure 4 This illustrates a flowchart of the hybrid dimming drive process provided in an embodiment of this application. Figure 4 As shown, the hybrid dimming drive process can sequentially include determining the DC current level and reference DC current, calculating the actual DC current, calculating the pulse width modulation duty cycle, and outputting the drive signal. Specifically, each color channel determines its reference DC current based on its corresponding DC current level, and obtains the actual DC current by combining the scene adjustment coefficient and the current correction coefficient. Then, the pulse width modulation duty cycle is determined based on the drive brightness and the actual DC current, and the DC current level is adjusted when the duty cycle exceeds a preset duty cycle range. Finally, a DC current control signal and a pulse width modulation signal are output.

[0159] The above Figure 4 The meaning of each parameter, the calculation method, and the corresponding implementation process in the process shown can be found in step S106 and the relevant descriptions in its various implementations, and will not be repeated here.

[0160] See Figure 5 The diagram shows a schematic of the backlight control device provided in the embodiments of this application; for ease of explanation, only the parts related to the embodiments of this application are shown.

[0161] The backlight control device 500 may specifically include: Image acquisition module 501 is used to acquire the image to be displayed; The scene recognition module 502 is used to determine the scene type corresponding to the image to be displayed based on the image features of the image to be displayed; The strategy determination module 503 is used to determine the hybrid dimming strategy parameters corresponding to the scene type based on the scene type. The hybrid dimming strategy parameters include at least: DC current level, pulse width modulation frequency and crosstalk compensation strength. The target brightness determination module 504 is used to determine the target brightness of each color channel of at least one backlight zone in the display panel in the first color space based on the image to be displayed. The correction module 505 is used to correct the target brightness corresponding to any color channel in the first backlight partition according to the crosstalk compensation strength and the crosstalk coefficient corresponding to the combination of each color channel between each backlight partition, so as to obtain the driving brightness corresponding to any color channel. The first backlight partition is any backlight partition among at least one backlight partition. The backlight driver module 506 is used to output the backlight driver signal corresponding to any color channel according to the DC current level, pulse width modulation frequency and the driving brightness corresponding to any color channel.

[0162] In this embodiment of the application, the scene recognition module 502 may specifically include: The color space conversion unit is used to convert the image to be displayed from a first color space to a second color space; The feature extraction unit is used to extract at least one of color distribution features, spatial frequency features, saliency features, and temporal domain features from the image to be displayed in the second color space as image features; The scene type determination unit is used to determine the scene type corresponding to the image to be displayed based on at least one of color distribution characteristics, spatial frequency characteristics, saliency characteristics, and temporal domain characteristics.

[0163] In this embodiment of the application, the scene type determination unit can also be used for: If the color distribution features meet the first condition, the image to be displayed is determined to correspond to the first scene type; the first condition includes: the proportion of pixels corresponding to the dominant color is greater than the preset dominant color proportion threshold, the proportion of the high-saturation pixel area is greater than the preset saturation proportion threshold, and the light-colored pixel area exists.

[0164] In this embodiment, the strategy determination module 503 can also be used to determine the hybrid dimming strategy parameters associated with the first scene type. These parameters include a first DC current level, a first pulse width modulation frequency, and a first crosstalk compensation strength. Specifically, the first DC current level is used to determine the first reference DC current of the color channel corresponding to the dominant color from a preset reference DC current lookup table; the first reference DC current is less than a preset reference DC current. The first pulse width modulation frequency is higher than the preset reference pulse width modulation frequency. The first crosstalk compensation strength is used to adjust the crosstalk amount determined based on the crosstalk coefficients corresponding to the color channel combinations between adjacent backlight zones, thereby determining the crosstalk compensation amount between adjacent backlight zones.

[0165] In this embodiment of the application, the strategy determination module 503 may specifically include: The weight determination unit is used to determine the weight corresponding to each scene type when the image to be displayed corresponds to at least two scene types. The strategy parameter determination unit is used to determine the hybrid dimming strategy parameters corresponding to the image to be displayed based on the weights corresponding to each scene type and the hybrid dimming strategy parameters corresponding to each scene type.

[0166] In this embodiment, the hybrid dimming strategy parameters further include a color enhancement coefficient, and the target brightness determination module 504 may specifically include: The region determination unit is used to determine the image region corresponding to each backlight zone in the image to be displayed; The initial target brightness determination unit is used to determine the initial target brightness corresponding to each color channel in each backlight partition based on the color channel value of each pixel in each image region in the first color space. The target brightness adjustment unit is used to adjust the initial target brightness of each color channel in each backlight zone according to the color enhancement coefficient, so as to obtain the target brightness of each color channel in each backlight zone.

[0167] In this embodiment of the application, the correction module 505 may specifically include: The sub-channel matrix construction unit is used to construct the sub-channel crosstalk coefficient matrix corresponding to each color channel combination based on the crosstalk coefficients corresponding to each color channel combination between different backlight partitions. The coupling matrix determination unit is used to determine the color coupling matrix based on the crosstalk coefficient matrix of each sub-channel; The initial estimation value determination unit is used to determine the target brightness corresponding to each color channel in each backlight zone as the initial driving brightness estimate value; The crosstalk determination unit is used to determine the crosstalk amount corresponding to the current iteration based on the color coupling matrix and the estimated driving brightness value corresponding to the current iteration. The crosstalk compensation amount determination unit is used to determine the crosstalk compensation amount corresponding to the current iteration round based on the crosstalk compensation strength and crosstalk amount. The estimation update unit is used to determine the estimated driving brightness value for the next iteration based on the target brightness and crosstalk compensation amount of each color channel in each backlight partition. The drive brightness determination unit is used to determine the estimated drive brightness value corresponding to the last iteration as the drive brightness of each color channel in each backlight partition after completing a preset number of iterations.

[0168] In this embodiment, the backlight driving signal includes a DC current control signal and a pulse width modulation signal, and the DC current levels include the DC current levels corresponding to each color channel. The backlight driving module 506 may specifically include: The reference DC current determination unit is used to determine the reference DC current corresponding to each color channel from a preset reference DC current lookup table based on the DC current level corresponding to each color channel. The DC current value determination unit is used to determine the DC current value corresponding to each color channel in each backlight zone based on the reference DC current. The duty cycle determination unit is used to determine the pulse width modulation duty cycle corresponding to each color channel in each backlight zone based on the DC current value and the corresponding driving brightness. The drive signal output unit is used to output a DC current control signal according to the DC current value, and to output a pulse width modulation signal according to the pulse width modulation frequency and the pulse width modulation duty cycle.

[0169] In this embodiment of the application, the DC current value determination unit can also be used for: Obtain the current correction coefficient for each color channel in each backlight zone; Determine the scene adjustment coefficient for each color channel based on the scene type; Based on the reference DC current and scene adjustment coefficient corresponding to each color channel, and the current correction coefficient corresponding to each color channel in each backlight zone, determine the DC current value corresponding to each color channel in each backlight zone.

[0170] In this embodiment of the application, the DC current value determination unit can also be used for: Light up each color channel in each backlight zone separately, and obtain the measured brightness of each color channel in each backlight zone. The average brightness of the color channel is determined based on the measured brightness of the same color channel in each backlight zone. Based on the ratio of the average brightness to the measured brightness of the color channel in each backlight zone, the current correction coefficient corresponding to the color channel in each backlight zone is determined, so as to predetermine the current correction coefficient corresponding to each color channel in each backlight zone.

[0171] In this embodiment of the application, the duty cycle determination unit can also be used for: Determine whether the pulse width modulation duty cycle is within the preset duty cycle range; If the pulse width modulation duty cycle exceeds the preset duty cycle range, adjust the corresponding DC current level. The corresponding reference DC current is re-determined based on the adjusted DC current level, and the DC current value and pulse width modulation duty cycle are re-determined based on the re-determined reference DC current, so that the re-determined pulse width modulation duty cycle is within the preset duty cycle range.

[0172] It should be noted that, for the sake of convenience and brevity, the specific uses or working processes of each module and unit in the backlight control device 500 can be referred to the corresponding processes of each implementation in the backlight control method embodiments, and will not be repeated here.

[0173] See Figure 6 This application also provides a backlight module, such as... Figure 6 As shown, the backlight module 600 includes a light-emitting unit array 601 and a backlight driving unit 602; The light-emitting unit array 601 includes multiple backlight zones arranged in an array, and each backlight zone includes at least one set of red light-emitting units, green light-emitting units and blue light-emitting units; The backlight driving unit 602 is connected to each of the light-emitting units and is used to drive the light-emitting units of different colors in each of the backlight zones to emit light.

[0174] Specifically, the backlight module 600 can be an RGB Mini-LED backlight module, which emits light through a combination of different color light-emitting units to provide corresponding backlight for the display panel.

[0175] Specifically, the light-emitting unit array 601 can be formed by arranging multiple backlight zones in a row and column direction. Each backlight zone includes at least one set of red light-emitting units, green light-emitting units, and blue light-emitting units. The red, green, and blue light-emitting units correspond to the red, green, and blue channels, respectively. By adjusting the light emission state of different color light-emitting units, the brightness and color output of the corresponding backlight zone can be adjusted.

[0176] The backlight driving unit 602 may include a controller and a memory. The memory stores a computer program. When the controller executes the computer program, it implements the steps in the aforementioned backlight control method embodiment to control the light-emitting units of different colors in each backlight zone to emit light according to the image to be displayed.

[0177] In another possible implementation, this application embodiment also provides a display device, the display device including a display panel and a backlight module 600 as described in the above embodiments, the backlight module 600 being disposed on the backlight side of the display panel.

[0178] Since the backlight module 600 includes a backlight driving unit 602, and the backlight driving unit 602 may include a controller and a memory, in one example, the display device may further include a controller and a memory disposed in the backlight driving unit 602. Based on this, a specific implementation structure of the display device will be described below in conjunction with the controller, the memory, and the display panel.

[0179] Specifically, see Figure 7 This illustration shows a schematic diagram of a display device according to an embodiment of this application. In one possible implementation, a portion of the display device may be disposed in the aforementioned backlight driving unit 602; as... Figure 7 As shown, the display device 700 of this embodiment includes: at least one controller 710 ( Figure 7 The diagram shows only one of the following: a memory 720, a computer program 721 stored in the memory 720 and executable on at least one controller 710, and a display panel 730. When the controller 710 executes the computer program 721, it implements the steps in the above-described backlight control method embodiments.

[0180] The controller 710, the memory 720, and the computer program 721 stored in the memory 720 and capable of running on at least one controller 710 can all be located in the backlight driving unit 602, and this application does not limit this.

[0181] The display device 700 can be an RGB Mini-LED backlit liquid crystal display device. The display device 700 may include a liquid crystal display panel, an RGB Mini-LED backlight module, and the backlight control system described in the foregoing embodiments. The RGB Mini-LED backlight module is disposed on the backlight side of the liquid crystal display panel. The RGB Mini-LED backlight module may include multiple backlight zones, each backlight zone including light-emitting units corresponding to the red, green, and blue channels, respectively. The backlight control system is used to drive and control the light-emitting units corresponding to each color channel in each backlight zone according to the image to be displayed, so as to provide the liquid crystal display panel with backlight matching the image to be displayed.

[0182] Furthermore, the display device 700 may also include a controller 710 and a memory 720. The memory 720 may be used to store computer programs, and the controller 710 may be used to execute the computer programs stored in the memory 720 to implement the backlight control method described in any of the foregoing embodiments. The controller 710 may also be communicatively connected to the display panel 730 to implement corresponding data processing and control functions.

[0183] Those skilled in the art will understand that Figure 7 The structure shown is merely an example of the display device 700 and does not constitute a limitation on the display device 700. In other possible embodiments, the display device 700 may include more or fewer components than shown, or some components may be combined or different component configurations may be used. For example, the display device 700 may also include input / output interfaces, communication interfaces, network access modules, power modules, etc., which are not specifically limited in this application embodiment.

[0184] The controller 710 may be a central processing unit (CPU), or it may be other general-purpose controllers, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose controller may be a microcontroller or any conventional controller.

[0185] In some embodiments, memory 720 may be an internal storage unit of display device 700, such as a hard disk or memory of display device 700. In other embodiments, memory 720 may be an external storage device of display device 700, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on display device 700. Furthermore, memory 720 may include both internal and external storage units of display device 700. Memory 720 is used to store operating system, application programs, boot loader, data, and other programs, such as program code for computer programs. Memory 720 may also be used to temporarily store data that has been output or will be output.

[0186] In specific implementations, the controller 710, memory 720, and computer program 721 described in the embodiments of this application can execute the embodiments of the backlight control method of this application, and will not be described again here.

[0187] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0188] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0189] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0190] In the embodiments provided in this application, it should be understood that the disclosed apparatus / display apparatus and method can be implemented in other ways. For example, the apparatus / display apparatus embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0191] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0192] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0193] If an integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a controller, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0194] The implementation of all or part of the processes in the methods of the above embodiments can also be accomplished by a computer program product. When the computer program product is run on the display device, the display device can implement the steps in the various method embodiments described above.

[0195] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A backlight control method, characterized in that, The method includes: Get the image to be displayed; Based on the image features of the image to be displayed, determine the scene type corresponding to the image to be displayed; Based on the scene type, determine the hybrid dimming strategy parameters corresponding to the scene type. The hybrid dimming strategy parameters include at least: DC current level, pulse width modulation frequency, and crosstalk compensation strength. Based on the image to be displayed, determine the target brightness corresponding to each color channel of at least one backlight zone in the display panel in the first color space; Based on the crosstalk compensation strength and the crosstalk coefficient corresponding to each color channel combination between each backlight partition, the target brightness corresponding to any color channel in the first backlight partition is corrected to obtain the driving brightness corresponding to any color channel. The first backlight partition is any one of at least one of the backlight partitions. Based on the DC current level, the pulse width modulation frequency, and the driving brightness corresponding to any of the color channels, output the backlight driving signal corresponding to any of the color channels.

2. The backlight control method as described in claim 1, characterized in that, The method further includes: Convert the image to be displayed from the first color space to the second color space; At least one of the following features—color distribution features, spatial frequency features, saliency features, and temporal domain features—is extracted from the image to be displayed in the second color space as the image features. Based on the image features of the image to be displayed, the scene type corresponding to the image to be displayed is determined, including: The scene type corresponding to the image to be displayed is determined based on at least one of the color distribution features, spatial frequency features, saliency features, and temporal domain features.

3. The backlight control method as described in claim 2, characterized in that, The step of determining the scene type corresponding to the image to be displayed based on the image features of the image to be displayed includes: When the color distribution features meet the first condition, the image to be displayed is determined to correspond to a first scene type. The first condition includes: the proportion of pixels corresponding to the dominant color is greater than a preset dominant color proportion threshold, the proportion of highly saturated pixel areas is greater than a preset saturation proportion threshold, and there are light-colored pixel areas. The hybrid dimming strategy parameters corresponding to the first scene type include: a first DC current level, a first pulse width modulation frequency, and a first crosstalk compensation strength; Wherein, the first DC current level is used to determine the first reference DC current of the color channel corresponding to the dominant color from a preset reference DC current lookup table, and the first reference DC current is less than the preset reference DC current. The first pulse width modulation frequency is higher than the preset reference pulse width modulation frequency; The first crosstalk compensation intensity is used to adjust the crosstalk amount determined according to the crosstalk coefficients corresponding to each color channel combination between adjacent backlight zones, so as to determine the crosstalk compensation amount between adjacent backlight zones.

4. The backlight control method as described in claim 1, characterized in that, The hybrid dimming strategy parameters also include a color enhancement coefficient; determining the target brightness of each color channel of at least one backlight zone in the display panel in the first color space based on the image to be displayed includes: Determine the image area corresponding to each of the backlight zones in the image to be displayed; Based on the component values ​​of the color channels of each pixel in each of the image regions in the first color space, the initial target brightness corresponding to each color channel in each of the backlight partitions is determined; Based on the color enhancement coefficient, the initial target brightness corresponding to each color channel in each of the backlight zones is adjusted to obtain the target brightness corresponding to each color channel in each of the backlight zones.

5. The backlight control method as described in claim 1, characterized in that, The step of correcting the target brightness corresponding to any color channel in the first backlight partition based on the crosstalk compensation strength and the crosstalk coefficient corresponding to each color channel combination between each backlight partition to obtain the driving brightness corresponding to any color channel includes: Based on the crosstalk coefficients corresponding to each color channel combination between different backlight partitions, construct a sub-channel crosstalk coefficient matrix corresponding to each color channel combination. The color coupling matrix is ​​determined based on the crosstalk coefficient matrices of each channel. The target brightness corresponding to each color channel in each of the backlight zones is determined as the initial driving brightness estimate; Based on the color coupling matrix and the estimated driving brightness value corresponding to the current iteration round, determine the crosstalk amount corresponding to the current iteration round; Based on the crosstalk compensation strength and the crosstalk amount, determine the crosstalk compensation amount corresponding to the current iteration round; Based on the target brightness of each color channel in each backlight zone and the crosstalk compensation amount, determine the estimated driving brightness value for the next iteration round; After completing a preset number of iterations, the estimated drive brightness value corresponding to the last iteration is determined as the drive brightness of each color channel in each backlight partition.

6. The backlight control method as described in claim 1, characterized in that, The backlight driving signal includes a DC current control signal and a pulse width modulation signal; the DC current level includes a DC current level corresponding to each color channel; the step of outputting a backlight driving signal corresponding to any color channel based on the DC current level, the pulse width modulation frequency, and the driving brightness corresponding to any color channel includes: Based on the DC current level corresponding to each color channel, the reference DC current corresponding to each color channel is determined from a preset reference DC current lookup table. Based on the reference DC current, determine the DC current value corresponding to each color channel in each of the backlight zones; Based on the DC current value and the corresponding driving brightness, determine the pulse width modulation duty cycle corresponding to each color channel in each of the backlight zones; The DC current control signal is output according to the DC current value, and the pulse width modulation signal is output according to the pulse width modulation frequency and the pulse width modulation duty cycle.

7. The backlight control method as described in claim 6, characterized in that, The method further includes: Obtain the current correction coefficient corresponding to each color channel in each of the backlight partitions; Based on the scene type, determine the scene adjustment coefficient corresponding to each color channel; The step of determining the DC current value corresponding to each color channel in each of the backlight zones based on the reference DC current includes: The DC current value corresponding to each color channel in each backlight partition is determined based on the reference DC current corresponding to each color channel and the scene adjustment coefficient, as well as the current correction coefficient corresponding to each color channel in each backlight partition.

8. The backlight control method as described in claim 6, characterized in that, After determining the pulse width modulation duty cycle corresponding to each color channel in each backlight zone based on the DC current value and the corresponding driving brightness, the method further includes: Determine whether the pulse width modulation duty cycle is within a preset duty cycle range; If the pulse width modulation duty cycle exceeds the preset duty cycle range, adjust the corresponding DC current level. The corresponding reference DC current is re-determined based on the adjusted DC current level, and the DC current value and the pulse width modulation duty cycle are re-determined based on the re-determined reference DC current, so that the re-determined pulse width modulation duty cycle is within the preset duty cycle range.

9. A backlight module, characterized in that, The backlight module includes an array of light-emitting units and a backlight driving unit; The light-emitting unit array includes multiple backlight zones arranged in an array, and each backlight zone includes at least one set of red light-emitting units, green light-emitting units and blue light-emitting units; The backlight driving unit is connected to each light-emitting unit and is used to perform the backlight control method as described in any one of claims 1 to 8.

10. A display device, characterized in that, The display device includes a display panel and a backlight module as described in claim 9, wherein the backlight module is disposed on the backlight side of the display panel.

Images