Backlight control system for liquid crystal display and method thereof

Abstract

The application provides a backlight control system and method for liquid crystal display, which comprises a backlight control center, a backlight partition mapping unit, a brightness feature extraction unit, a neighboring partition correlation unit, a parameter difference analysis unit and a backlight control unit; the backlight partition mapping unit maps a to-be-displayed image to an image sub-region of the backlight partition; the brightness feature extraction unit determines a first brightness feature parameter; the neighboring partition correlation unit determines a neighboring image sub-region; the parameter difference analysis unit performs parameter difference analysis based on the first brightness feature parameter and a second brightness feature parameter, and obtains a brightness change gradient direction and a brightness change gradient amplitude; and the backlight control unit adjusts an initial backlight brightness based on the first brightness feature parameter in combination with the brightness change gradient direction and the brightness change gradient amplitude, and obtains a target backlight brightness. The application effectively suppresses the generation of halos and improves the display quality of 2D local backlight dimming of the liquid crystal display.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal display screens, and in particular to a backlight control system and method for a liquid crystal display screen. Background Art

[0002] In the field of LCD displays, localized backlight modulation is a widely used backlight control method that can improve display contrast and image quality to a certain extent. 2D local dimming technology, in particular, achieves high light-dark contrast by mapping the backlight area into multiple zones, effectively improving the display quality of dynamic images.

[0003] However, when the backlight partitions become too small, the difficulty of 2D local dimming will increase significantly. Once improperly controlled, halo problems are likely to occur. The halo phenomenon is manifested as obvious white circles at the edge of the picture, which seriously affects the appearance and display quality of the picture. This is because when controlling the backlight of small partitions, it is difficult to accurately control the brightness of each partition, and the light between adjacent partitions easily interferes with each other, resulting in halo in high-contrast scenes. At present, there is a lack of effective methods on the market to solve the halo problem in 2D local dimming technology. Some attempts have been made to reduce halo through physical methods such as adding shading structures, but this not only increases the thickness and cost of the display, but also the effect is not ideal. Summary of the Invention

[0004] The present invention provides a backlight control system and method for a liquid crystal display screen, aiming to effectively solve the halo problem and improve the display quality of 2D local backlighting of the liquid crystal display screen.

[0005] In a first aspect, the present invention provides a backlight control system for a liquid crystal display screen, comprising a backlight control center, a backlight partition mapping unit, a brightness feature extraction unit, an adjacent partition association unit, a parameter difference analysis unit, and a backlight control unit; the backlight control center is connected to the backlight partition mapping unit, the brightness feature extraction unit, the adjacent partition association unit, the parameter difference analysis unit, and the backlight control unit, respectively, to manage and control each unit;

[0006] A backlight partition mapping unit is used to perform region mapping on the input image to be displayed according to the 2D backlight partition structure of the liquid crystal display screen to obtain an image sub-region corresponding to each backlight partition;

[0007] a brightness feature extraction unit, configured to determine, for any target image subregion, a first brightness feature parameter of the target image subregion according to the brightness value of each pixel in the target image subregion;

[0008] an adjacent partition associating unit, configured to determine adjacent image subregions based on position information of the target image subregion;

[0009] a parameter difference analysis unit, configured to perform parameter difference analysis based on the first brightness characteristic parameter and the second brightness characteristic parameter of the adjacent image subregion, to obtain a brightness change gradient direction and a brightness change gradient amplitude between the target image subregion and the adjacent image subregion;

[0010] A backlight control unit is used to adjust the initial backlight brightness of the backlight partition corresponding to the target image sub-area based on the first brightness characteristic parameter combined with the brightness change gradient direction and brightness change gradient amplitude to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-area.

[0011] In a second aspect, the present invention further provides a backlight control method for a liquid crystal display screen, which is implemented based on the backlight control system of the liquid crystal display screen described in the first aspect. The backlight control method for the liquid crystal display screen comprises:

[0012] Performing region mapping on the input image to be displayed according to the 2D backlight partition structure of the liquid crystal display to obtain image sub-regions corresponding to each backlight partition;

[0013] For any target image sub-region, determining a first brightness characteristic parameter of the target image sub-region according to the brightness value of each pixel in the target image sub-region;

[0014] Determining adjacent image subregions based on position information of the target image subregion;

[0015] performing parameter difference analysis based on the first brightness characteristic parameter and the second brightness characteristic parameter of the adjacent image subregion, obtaining a brightness change gradient direction and a brightness change gradient amplitude between the target image subregion and the adjacent image subregion;

[0016] Based on the first brightness characteristic parameter combined with the brightness change gradient direction and brightness change gradient amplitude, the initial backlight brightness of the backlight partition corresponding to the target image sub-region is adjusted to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region.

[0017] In a third aspect, the present invention further provides an electronic device comprising: a memory for storing a computer software program; and a processor for reading and executing the computer software program, thereby implementing any of the above-described backlight control methods for a liquid crystal display.

[0018] In a fourth aspect, the present invention further provides a non-transitory computer-readable storage medium, wherein the storage medium stores a computer software program, and when the computer software program is executed by a processor, the backlight control method of the liquid crystal display screen as described in any one of the above is implemented.

[0019] In a fifth aspect, the present invention provides a computer program product, comprising a computer program, which implements any of the above-mentioned backlight control methods for liquid crystal display screens when executed by a processor.

[0020] The backlight control system of the liquid crystal display provided by the embodiment of the present invention, on the one hand, performs backlight partition mapping and brightness feature extraction on the image, which can accurately understand the brightness of each image sub-region, so that the backlight brightness can be reasonably adjusted according to the image content, avoiding the problem of unnatural brightness transition caused by unified brightness control. On the other hand, the backlight brightness of the backlight partition is adjusted by the brightness change gradient direction and brightness change gradient amplitude between any target image sub-region and its adjacent image sub-region, so that the brightness value of the partition edge of the backlight partition can be accurately adjusted, so that the brightness transition can be smoothed, and the light interference between adjacent partitions is reduced, thereby effectively suppressing the generation of halo. Therefore, the embodiment of the present invention improves the display quality of 2D local backlight dimming of the liquid crystal display. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the backlight control system of the liquid crystal display provided by the present invention;

[0022] Figure 2 This is a flow chart of the backlight control method of the liquid crystal display provided by the present invention;

[0023] Figure 3 An embodiment diagram of an electronic device provided by an embodiment of the present invention;

[0024] Figure 4 A diagram of an embodiment of a computer-readable storage medium provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the specified features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0027] In the description of the present invention, the term "for example" is used to mean "used as an example, illustration or illustration". Any embodiment of the present invention described as "for example" is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any person skilled in the art to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed herein.

[0028] Optional, see Figure 1 As shown, Figure 1 This is a structural diagram of the backlight control system of the liquid crystal display provided by the present invention. The backlight control system of the liquid crystal display includes a backlight control center, a backlight partition mapping unit, a brightness feature extraction unit, an adjacent partition association unit, a parameter difference analysis unit and a backlight control unit; the backlight control center is connected to the backlight partition mapping unit, the brightness feature extraction unit, the adjacent partition association unit, the parameter difference analysis unit and the backlight control unit respectively to manage and control each unit.

[0029] Optionally, the liquid crystal display screen usually has a 2D backlight partition structure, that is, the entire backlight area is divided into multiple rectangular or other shaped backlight partitions, so the input image to be displayed needs to be divided according to this backlight partition structure. Therefore, the backlight partition mapping unit classifies and maps the pixels of the image to be displayed according to the range of the backlight partition, so that each backlight partition corresponds to a sub-area in the image, and the sub-area contains all the pixel points within the coverage range of the backlight partition. In one embodiment, the backlight partition of the liquid crystal display screen is a 4*4 matrix structure with 16 backlight partitions. The resolution of the image to be displayed is 800*600. The image is divided according to the range of the backlight partition, such as the first backlight partition in the upper left corner, and a certain range of pixel points corresponding to the upper left corner of the image are divided out to form the first image sub-area; and so on, the entire image is divided into 16 image sub-areas, and each sub-area corresponds to a backlight partition.

[0030] Optionally, for any target image sub-region, the brightness feature extraction unit analyzes the brightness values ​​of all pixels in the target image sub-region to obtain a first brightness feature parameter of the target image sub-region.

[0031] The brightness characteristic parameters may reflect information such as the overall brightness level and brightness distribution of the sub-region. Therefore, the first brightness characteristic parameters in the embodiment of the present invention include a first average brightness value, a first maximum brightness value, and a first minimum brightness value.

[0032] Optionally, each target image sub-region includes the location information of the backlight region in which it is located. Therefore, the adjacent partition association unit determines its adjacent image sub-region based on the location information of the target image sub-region, wherein the adjacent image sub-regions in the embodiment of the present invention can be an upper adjacent image sub-region, a lower adjacent image sub-region, a left adjacent image sub-region and a right adjacent image sub-region.

[0033] Optionally, the parameter difference analysis unit obtains second brightness characteristic parameters of adjacent image sub-regions, namely, a second average brightness value, a second maximum brightness value, and a second minimum brightness value.

[0034] Furthermore, the parameter difference analysis unit performs parameter difference analysis based on the first average brightness value, the first maximum brightness value and the first minimum brightness value, and the second average brightness value, the second maximum brightness value and the second minimum brightness value to determine the brightness change gradient direction and brightness change gradient amplitude between the target image sub-region and the adjacent image sub-region, wherein the gradient direction of the brightness change represents the direction from the sub-region with high brightness to the sub-region with low brightness, and the brightness change gradient amplitude represents the degree of brightness change.

[0035] Optionally, the backlight control unit sets the initial backlight brightness of the backlight partition corresponding to the target image sub-region according to the first average brightness value in the first brightness characteristic parameter. For example, for an image sub-region with a higher average brightness, the corresponding backlight partition brightness is set to a higher value; for an image sub-region with a lower average brightness, the corresponding backlight partition brightness is set to a lower value. Specifically, the backlight setting value corresponding to the average brightness of the high-brightness partition is 220, and the backlight setting value corresponding to the average brightness of the low-brightness partition is 30.

[0036] Furthermore, the backlight control unit adjusts the initial backlight brightness of the backlight partition corresponding to the target image sub-area according to the first average brightness value, the first maximum brightness value and the first minimum brightness value in the first brightness characteristic parameter, combined with the brightness change gradient direction and the brightness change gradient amplitude, to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-area.

[0037] The embodiments of the present invention perform backlight partition mapping and brightness feature extraction on an image, which can accurately understand the brightness of each image sub-region, allowing the backlight brightness to be reasonably adjusted according to the image content, thereby avoiding the problem of unnatural brightness transition caused by unified brightness control. On the other hand, the backlight brightness of the backlight partition is adjusted by adjusting the brightness change gradient direction and brightness change gradient amplitude between any target image sub-region and its adjacent image sub-region. Therefore, the brightness value of the partition edge of the backlight partition can be accurately adjusted, so that the brightness transition can be smoothed, and the light interference between adjacent partitions is reduced, thereby effectively suppressing the generation of halo, thereby improving the display quality of 2D local backlight dimming of the LCD screen.

[0038] Optional, see Figure 2 , Figure 2 Flowchart of the backlight control method of the liquid crystal display provided by the present invention. The execution subject of the backlight control method of the liquid crystal display in the embodiment of the present invention is the backlight control system. Therefore, the backlight control method of the liquid crystal display includes:

[0039] Step 10: performing region mapping on the input image to be displayed according to the 2D backlight partition structure of the liquid crystal display screen to obtain an image sub-region corresponding to each backlight partition.

[0040] Optionally, LCD screens typically have a 2D backlight partition structure, which divides the entire backlight area into multiple rectangular or other shaped backlight partitions. Therefore, the input image to be displayed needs to be divided according to this backlight partition structure. Therefore, the backlight control system categorizes and maps the pixels of the image to be displayed according to the range of the backlight partitions, so that each backlight partition corresponds to a sub-region of the image, and the sub-region includes all pixels within the coverage area of ​​the backlight partition, as described in steps 101 to 103.

[0041] In one embodiment, the backlight partitions of the liquid crystal display are arranged in a 4x4 matrix structure, with 16 backlight partitions. The resolution of the image to be displayed is 800x600. The image is divided according to the range of the backlight partitions. For example, for the first backlight partition in the upper left corner, a certain range of pixels corresponding to the upper left corner of the image is divided to form the first image sub-region. Similarly, the entire image is divided into 16 image sub-regions, each corresponding to a backlight partition.

[0042] Step 20: For any target image sub-region, determine a first brightness characteristic parameter of the target image sub-region according to the brightness value of each pixel in the target image sub-region.

[0043] Furthermore, for any target image sub-region, the backlight control system analyzes the brightness values ​​of all pixels in the target image sub-region to obtain a first brightness characteristic parameter of the target image sub-region, as specifically described in steps 201 to 204 .

[0044] The brightness characteristic parameters may reflect information such as the overall brightness level and brightness distribution of the sub-region. Therefore, the first brightness characteristic parameters in the embodiment of the present invention include a first average brightness value, a first maximum brightness value, and a first minimum brightness value.

[0045] Step 30: Determine the adjacent image sub-regions based on the position information of the target image sub-region.

[0046] Optionally, each target image sub-region includes position information of the backlight region in which it is located. Therefore, the backlight control system determines its adjacent image sub-region based on the position information of the target image sub-region, wherein the adjacent image sub-regions in the embodiment of the present invention can be an upper adjacent image sub-region, a lower adjacent image sub-region, a left adjacent image sub-region and a right adjacent image sub-region.

[0047] Step 40 : performing parameter difference analysis based on the first brightness characteristic parameter and the second brightness characteristic parameter of the adjacent image sub-region to obtain the brightness change gradient direction and brightness change gradient amplitude between the target image sub-region and the adjacent image sub-region.

[0048] Furthermore, the backlight control system obtains second brightness characteristic parameters of adjacent image sub-regions, namely, a second average brightness value, a second maximum brightness value, and a second minimum brightness value.

[0049] Furthermore, the backlight control system performs parameter difference analysis based on the first average brightness value, the first maximum brightness value and the first minimum brightness value, and the second average brightness value, the second maximum brightness value and the second minimum brightness value, and determines the brightness change gradient direction and brightness change gradient amplitude between the target image sub-region and the adjacent image sub-region through the brightness change, wherein the gradient direction of the brightness change represents the direction from the sub-region with high brightness to the sub-region with low brightness, and the brightness change gradient amplitude represents the degree of brightness change, as specifically described in steps 401 to 404.

[0050] Step 50 : adjusting the initial backlight brightness of the backlight partition corresponding to the target image sub-region based on the first brightness characteristic parameter combined with the brightness change gradient direction and brightness change gradient amplitude to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region.

[0051] Furthermore, the backlight control system sets the initial backlight brightness of the backlight partition corresponding to the target image sub-region according to the first average brightness value in the first brightness characteristic parameter. For example, for an image sub-region with a higher average brightness, the corresponding backlight partition brightness is set to a higher value; for an image sub-region with a lower average brightness, the corresponding backlight partition brightness is set to a lower value. Specifically, the backlight setting value corresponding to the average brightness of the high-brightness partition is 220, and the backlight setting value corresponding to the average brightness of the low-brightness partition is 30.

[0052] Furthermore, the backlight control system adjusts the initial backlight brightness of the backlight partition corresponding to the target image sub-area according to the first average brightness value, the first maximum brightness value and the first minimum brightness value in the first brightness characteristic parameter, combined with the brightness change gradient direction and the brightness change gradient amplitude, to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-area, as specifically described in steps 501 to 505.

[0053] The embodiments of the present invention perform backlight partition mapping and brightness feature extraction on an image, which can accurately understand the brightness of each image sub-region, allowing the backlight brightness to be reasonably adjusted according to the image content, thereby avoiding the problem of unnatural brightness transition caused by unified brightness control. On the other hand, the backlight brightness of the backlight partition is adjusted by adjusting the brightness change gradient direction and brightness change gradient amplitude between any target image sub-region and its adjacent image sub-region. Therefore, the brightness value of the partition edge of the backlight partition can be accurately adjusted, so that the brightness transition can be smoothed, and the light interference between adjacent partitions is reduced, thereby effectively suppressing the generation of halo, thereby improving the display quality of 2D local backlight dimming of the LCD screen.

[0054] In one embodiment, steps 101 to 103 are described as follows:

[0055] Step 101 : Based on the screen size and screen resolution of the liquid crystal display, the image size and image resolution of the image to be displayed are adaptively adjusted to obtain an adjusted image.

[0056] Optionally, different LCD screens have their own specific screen sizes (physical dimensions, such as length and width) and screen resolutions (number of pixels in the horizontal and vertical directions). The image size and resolution of the image to be displayed may not match the screen size and resolution of the LCD screen. In order to correctly display the image on the LCD screen, the image needs to be adapted.

[0057] Therefore, the backlight control system obtains the display size and resolution of the LCD screen, as well as the image size and resolution of the image to be displayed. Based on the LCD screen size and resolution, the backlight control system adaptively adjusts the image size and resolution of the image to be displayed, respectively, to obtain an adjusted image. When adjusting the image size, the image's aspect ratio must be maintained to avoid image distortion. Adjusting the resolution may involve operations such as pixel resampling to ensure that the number of pixels in the image meets the display screen's resolution requirements. In one embodiment, an LCD screen has a display size of 20 cm long and 15 cm wide, and a display resolution of 1920*1080. The image to be displayed has a size of 10 cm long and 8 cm wide, and a resolution of 1280*720. The display screen's aspect ratio is first calculated to be 20 / 15 = 4 / 3, and the image's aspect ratio is 10 / 8 = 5 / 4. To adapt to the display screen size and maintain the integrity of the image content, scaling is performed based on the image's shorter side (width). Let the scaling factor be k, the number of pixels corresponding to the display width be 1080, and the number of pixels corresponding to the image width be 720, then k = 1080 / 720 = 1.5. Multiply the image's length and width by the scaling factor of 1.5, respectively, to obtain a new image size of 15 cm long and 12 cm wide. The resolution becomes 1280*1.5 = 1920 and 720*1.5 = 1080, thus obtaining the adjusted image.

[0058] Step 102 : Mapping each pixel in the adjusted image to the display screen coordinate system based on the position coordinates of each pixel in the adjusted image in the image coordinate system and the mapping relationship between the image coordinate system and the display screen coordinate system of the liquid crystal display screen.

[0059] Furthermore, images have their own coordinate systems, typically with the upper-left corner of the image as the origin (0, 0), with the positive x-axis pointing horizontally to the right and the positive y-axis pointing vertically downward. LCD screens also have their own coordinate systems, including their origin position, coordinate axis directions, and unit lengths. Because the image coordinate system and the display coordinate system differ, correctly displaying pixels in an adjusted image on the display requires pre-establishing a mapping relationship between the image coordinate system and the display coordinate system. This mapping relationship is related to the coordinate origin positions of the image and display coordinate systems, as well as the display resolution and image resolution.

[0060] Therefore, the backlight control system obtains the position coordinates of each pixel point in the adjusted image in the image coordinate system, and maps each pixel point in the adjusted image to the display screen coordinate system based on the mapping relationship between the image coordinate system and the display screen coordinate system of the liquid crystal display screen, so that the coordinates of each pixel point in the image coordinate system are converted into coordinates in the display screen coordinate system.

[0061] In one embodiment, the origin of the image coordinate system is at the upper left corner, and the origin of the display screen coordinate system is at the lower left corner. The image resolution is 1920*1080, and the display screen resolution is also 1920*1080. For a pixel with coordinates (x, y) in the adjusted image, the coordinate conversion formula for the coordinates (x', y') in the display screen coordinate system is: x' = x, y' = 1080 - y. For example, if the coordinates of a pixel in the image are (500, 300), then the coordinates in the display screen coordinate system are (500, 1080 - 300) = (500, 780).

[0062] Step 103 : performing region mapping on the adjusted image according to the coordinate region of each backlight partition in the 2D backlight partition structure in the display screen coordinate system to obtain an image sub-region corresponding to each backlight partition.

[0063] Optionally, the 2D backlight partition structure of the liquid crystal display screen divides the entire display screen into a plurality of different backlight partitions, and each partition has a clear coordinate area definition in the display screen coordinate system.

[0064] Therefore, after mapping the pixels of the adjusted image to the display screen coordinate system, the backlight control system groups the pixels within the coordinate range of each backlight partition into a group based on the coordinate range of the partition, forming an image sub-region corresponding to the backlight partition. In one embodiment, the display screen is divided into a 3*3 2D backlight partition structure. The coordinate range of each backlight partition in the display screen coordinate system is as follows: the coordinate range of the upper left corner partition is from 0 to 640 for x and from 0 to 360 for y; the coordinate range of the upper middle partition is from 640 to 1280 for x and from 0 to 360 for y, and so on. For the adjusted image that has been mapped to the display screen coordinate system, each pixel in the image is traversed to determine whether its coordinates are within the coordinate range of a certain backlight partition. For example, a pixel with coordinates (300, 200) falls within the coordinate range of the upper left backlight partition and is classified as the image sub-region corresponding to the upper left backlight partition. By determining and classifying all pixels, nine image sub-regions corresponding to each backlight partition are obtained.

[0065] The embodiments of the present invention achieve the precise adaptation of images to be displayed of any size and resolution to the 2D backlight partition structure of a specific liquid crystal display screen, and can accurately understand the brightness of each image sub-area, so that the backlight brightness can be reasonably adjusted according to the image content, avoiding the unnatural brightness transition problem caused by unified brightness control, thereby effectively suppressing the generation of halo.

[0066] In one embodiment, steps 201 to 204 are described as follows:

[0067] Step 201 : Logarithmically transform the brightness value of each pixel in the target image sub-region to obtain a transformed brightness value of each pixel in the target image sub-region.

[0068] Optionally, the backlight control system performs logarithmic transformation on the brightness value of each pixel in the target image sub-region to obtain a transformed brightness value of each pixel in the target image sub-region. The specific formula is as follows:

[0069] L(x,y)=log(1+I(x,y)).

[0070] Where L(x,y) represents the transformed brightness value of each pixel point (x,y) in the target image subregion, and I(x,y) represents the brightness value of each pixel point (x,y) in the target image subregion.

[0071] Step 202 : performing difference analysis based on the brightness value of each pixel in the target image sub-region and the brightness values ​​of the neighboring pixels corresponding to each pixel to obtain the local neighborhood brightness difference value of each pixel.

[0072] Furthermore, the backlight control system takes each pixel point in the target image sub-area as the center, and the preset range area is the neighborhood of each pixel point, wherein the preset area is such as 3*3, 5*5, etc., and the pixel points in the neighborhood are the neighborhood pixel points of each pixel point in the target image sub-area. For example, if the preset area is 3*3, the neighborhood centered on the pixel point includes the pixel point itself and the 8 pixels around it.

[0073] Furthermore, the backlight control system performs a difference analysis based on the brightness value of each pixel in the target image sub-area and the brightness value of the neighboring pixel points corresponding to each pixel point, that is, calculates the brightness value of each pixel point and the brightness difference between the brightness values ​​of each neighboring pixel point, and combines the average difference and each brightness difference to obtain the local neighborhood brightness difference of each pixel point.

[0074] In one embodiment, taking a pixel point P as an example, its brightness value is L P =80. Within a 3*3 neighborhood centered on P, the brightness values ​​of the neighboring pixels are L1=75, L2=85, L3=78, L4=82, L5=80, L6=77, L7=83, and L8=79. Calculate the brightness difference between this pixel and its neighboring pixels. For example, the difference with L1 is |80-75|=5, and the difference with L2 is |80-85|=5. The local neighborhood brightness difference of this pixel is represented by the average difference, that is, first calculate the sum of all neighborhood differences, and then calculate the average. Therefore, the local neighborhood brightness difference = (5+5+2+2+0+3+3+1) / 8=2.625.

[0075] Step 203 : performing a fusion analysis based on the transformed brightness value of each pixel in the target image subregion and the brightness difference value of the local neighborhood to obtain a fused brightness value of each pixel.

[0076] Furthermore, the backlight control system fuses and analyzes the transformed brightness value of each pixel in the target image sub-region and the local neighborhood brightness difference to obtain the fused brightness value of each pixel, where the fused brightness value L of each pixel is f The specific formula for (x,y) is as follows:

[0077] L f (x,y)=[L(x,y)*(1+D(x,y) / D max )] / [1+L(x,y)].

[0078] Among them, D(x,y) represents the local neighborhood brightness difference of each pixel (x,y) in the target image sub-region, D max Indicates the maximum brightness difference between the brightness value of each pixel (x, y) in the target image subregion and the brightness value of the neighboring pixels.

[0079] Step 204 : performing parameter analysis based on the fused brightness value of each pixel in the target image sub-region to obtain a first brightness feature parameter of the target image sub-region.

[0080] Furthermore, the backlight control system performs parameter analysis on the fused brightness value of each pixel point in the target image sub-area to obtain a first brightness characteristic parameter of the target image sub-area, wherein the parameter analysis includes average brightness value analysis, maximum brightness value analysis and minimum brightness value analysis. Therefore, the first brightness characteristic parameter obtained includes a first average brightness value, a first maximum brightness value and a first minimum brightness value.

[0081] The backlight control of the embodiment of the present invention provides comprehensive and accurate brightness characteristic parameters that reflect the sub-area, so that the brightness of each image sub-area can be accurately understood based on the brightness characteristic parameters, so that the backlight brightness can be reasonably adjusted according to the image content, avoiding the unnatural brightness transition problem caused by unified brightness control, thereby effectively suppressing the generation of halo and improving the display quality of 2D local backlight dimming of the LCD display.

[0082] In one embodiment, steps 401 to 404 are described as follows:

[0083] Step 401 : Initialize parameters based on a first average brightness value, a first maximum brightness value, and a first minimum brightness value in a first brightness characteristic parameter to obtain a brightness deviation factor.

[0084] Optionally, the backlight control system performs parameter initialization according to the first average brightness value, the first maximum brightness value, and the first minimum brightness value in the first brightness characteristic parameter to obtain a brightness deviation factor, wherein the specific formula of the brightness deviation factor α is as follows:

[0085]

[0086] in, Indicates the first maximum brightness value of the target image sub-region, Indicates the first minimum brightness value of the target image sub-region, Indicates the first average brightness value of the target image sub-region.

[0087] Step 402, based on the first average brightness value and the second average brightness value in the second brightness characteristic parameter, respectively combine the brightness value of each pixel point in the target image subregion and the brightness value of each pixel point in the adjacent image subregion to perform brightness fluctuation correction, and obtain the first brightness fluctuation correction coefficient of the target image subregion and the second brightness fluctuation correction coefficient of the adjacent image subregion.

[0088] Optionally, for the adjacent image subregions, the adjacent image subregions may be an upper adjacent image subregion, a lower adjacent image subregion, a left adjacent image subregion, and a right adjacent image subregion. The adjacent image subregion in the embodiment of the present invention is an upper adjacent image subregion.

[0089] Furthermore, the backlight control system performs a brightness standard deviation analysis based on the brightness value of each pixel in the target image sub-region and the first average brightness value to obtain a first brightness fluctuation correction coefficient for the target image sub-region. The specific formula of the first brightness fluctuation correction coefficient is as follows:

[0090]

[0091] Among them, σ t Represents the first brightness fluctuation correction coefficient of the target image sub-region, N t Represents the total number of pixels in the sub-region of the target image, Represents the brightness value of each pixel in the target image sub-region.

[0092] Furthermore, the backlight control system performs a brightness standard deviation analysis based on the brightness value of each pixel in the upper adjacent image sub-region and the second average brightness value of the upper adjacent image sub-region to obtain a second brightness fluctuation correction coefficient for the upper adjacent image sub-region. The specific formula for the regional brightness standard deviation value is as follows:

[0093]

[0094] σ uRepresents the second brightness fluctuation correction coefficient of the adjacent image sub-region, N u Represents the total number of pixels in the adjacent image sub-region, Represents the brightness value of each pixel in the adjacent image sub-region.

[0095] Step 403 : Based on the brightness deviation factor, the first brightness fluctuation correction coefficient, and the second brightness fluctuation correction coefficient, the difference between the first average brightness value and the second average brightness value is corrected to obtain a corrected average brightness value.

[0096] Furthermore, the backlight control system calculates the correction factor β of the adjacent image sub-region according to the first brightness fluctuation correction coefficient and the second brightness fluctuation correction coefficient. u , the specific formula is as follows:

[0097] β u =1 / [1+|σ t -σ u |].

[0098] Furthermore, the backlight control system calculates the difference between the first average brightness value and the second average brightness value to obtain an average brightness difference value, and corrects the average brightness difference value according to the brightness deviation factor and the correction factor to obtain a corrected average brightness value. The specific formula is as follows:

[0099]

[0100] Step 404 , performing parameter difference analysis based on the corrected average brightness value in combination with the first maximum brightness value and the first minimum brightness value, as well as the second maximum brightness value and the second minimum brightness value in the second brightness characteristic parameter, to obtain the brightness change gradient direction and the brightness change gradient amplitude.

[0101] Furthermore, the backlight control system performs parameter difference analysis based on the corrected average brightness value in combination with the first maximum brightness value and the first minimum brightness value, as well as the second maximum brightness value and the second minimum brightness value, to obtain the brightness change gradient direction and the brightness change gradient amplitude, as specifically shown in steps 4041 to 4043.

[0102] The embodiment of the present invention can accurately determine the brightness change gradient direction and brightness change gradient amplitude between any target image sub-region and its adjacent image sub-region, providing a data basis for the subsequent adjustment of the backlight brightness of the backlight partition according to the brightness change gradient direction and brightness change gradient amplitude. Therefore, the brightness value of the partition edge of the backlight partition can be accurately adjusted, so that the brightness transition can be smoothed, and the light interference between adjacent partitions is reduced, thereby effectively suppressing the generation of halo and improving the display quality of the 2D local backlight dimming of the liquid crystal display.

[0103] In one embodiment, steps 4041 to 4043 are described as follows:

[0104] Step 4041 : performing a comprehensive difference calculation based on the first maximum brightness value, the first minimum brightness value, the second maximum brightness value, and the second minimum brightness value to obtain a comprehensive brightness difference index.

[0105] Furthermore, the backlight control system performs a comprehensive difference calculation based on the first maximum brightness value, the first minimum brightness value, the second maximum brightness value, and the second minimum brightness value to obtain a comprehensive brightness difference index, wherein the comprehensive brightness difference index is The specific formula is:

[0106]

[0107] Furthermore, considering the brightness range difference between the target image sub-region and the adjacent image sub-region, the comprehensive brightness difference index Therefore, the backlight control system calculates the adjustment factor according to the first maximum brightness value, the first minimum brightness value, the second maximum brightness value and the second minimum brightness value, wherein the adjustment factor γ u The specific formula is as follows:

[0108]

[0109] Furthermore, the backlight control system adjusts the u Comprehensive brightness difference index Adjust and get the brightness difference index after adjustment. for:

[0110]

[0111] In step 4042, the horizontal direction set by the LCD screen is used as the horizontal axis and the vertical direction is used as the vertical axis. The direction is calculated in combination with the corrected average brightness value to obtain the brightness change gradient direction.

[0112] Furthermore, the backlight control system uses the horizontal direction set by the LCD screen as the horizontal axis and the vertical direction as the vertical axis, and combines the corrected average brightness value and the adjusted brightness difference index to perform direction calculation to obtain the brightness change gradient direction, where the brightness change gradient direction θ u The specific formula is as follows:

[0113]

[0114] Among them, arctan2() is used to determine the angle based on the y-component and x-component of the vector. The value range is [-π,π]. It takes into account the difference in brightness changes in the two dimensions and can more accurately reflect the directional trend of brightness changes.

[0115] Step 4043 , performing gradient amplitude calculation based on the comprehensive brightness difference index, the brightness change gradient direction, and the corrected average brightness value to obtain the brightness change gradient amplitude.

[0116] Furthermore, the backlight control system calculates the gradient amplitude according to the adjusted result of the comprehensive brightness difference index, the brightness change gradient direction and the corrected average brightness value to obtain the brightness change gradient amplitude, wherein the brightness change gradient amplitude A u The specific formula is:

[0117]

[0118] The embodiment of the present invention can accurately determine the brightness change gradient direction and the brightness change gradient amplitude, providing a data basis for the subsequent process, so that the backlight brightness of the backlight partition can be adjusted according to the brightness change gradient direction and the brightness change gradient amplitude. Therefore, the brightness value of the partition edge of the backlight partition can be accurately adjusted, so that the brightness transition can be smoothed, and the light interference between adjacent partitions can be reduced, thereby effectively suppressing the generation of halo and improving the display quality of the 2D local backlight dimming of the liquid crystal display.

[0119] In one embodiment, steps 501 to 505 are described as follows:

[0120] Step 501 : performing brightness change analysis based on a first average brightness value, a first maximum brightness value, and a first minimum brightness value in a first brightness characteristic parameter to obtain a brightness change degree value.

[0121] Optionally, the backlight control system performs a brightness change analysis based on the first average brightness value, the first maximum brightness value, and the first minimum brightness value to obtain a brightness change degree value, wherein the brightness change degree value L B The specific formula is as follows:

[0122]

[0123] Step 502 : A gradient direction influencing factor is calculated based on the brightness change gradient direction, and a gradient amplitude correction value is calculated based on the brightness change degree value and the brightness change gradient amplitude.

[0124] Furthermore, the backlight control system calculates the gradient direction influence factor according to the brightness change gradient direction, wherein the gradient direction influence factor D θ The specific formula is:

[0125] D θ = sin(θ u )+cos(θ u ).

[0126] Furthermore, the backlight control system calculates the gradient amplitude correction value based on the brightness change degree value and the brightness change gradient amplitude, wherein the gradient amplitude correction value A adj The specific formula is as follows:

[0127] A adj =A u *[1+1 / (1+exp(L B ))].

[0128] Step 503 : adjusting the initial backlight brightness of the backlight subarea corresponding to the target image subarea based on the gradient direction influencing factor and the gradient amplitude correction value to obtain a first adjusted backlight brightness.

[0129] Furthermore, the backlight control system adjusts the initial backlight brightness of the backlight partition corresponding to the target image sub-region according to the gradient direction influencing factor and the gradient amplitude correction value to obtain a first adjusted backlight brightness, wherein the specific formula of the first adjusted backlight brightness is as follows:

[0130] L pre =L init *[1+(D θ *A adj ) / 10].

[0131] Step 504 : performing a balance adjustment on the first adjusted backlight brightness based on the first average brightness value to obtain a second adjusted backlight brightness.

[0132] Furthermore, the backlight control system calculates a brightness adjustment factor according to the first average brightness value, wherein the brightness adjustment factor C x The specific formula is:

[0133]

[0134] Furthermore, the backlight control system balances and adjusts the first adjusted backlight brightness according to the brightness adjustment factor to obtain the second adjusted backlight brightness. The second adjusted backlight brightness L bal The specific formula is:

[0135] L bal =L pre *C x .

[0136] Step 505 adjusts the second adjusted backlight brightness based on the first maximum brightness value and the first minimum brightness value to obtain a target backlight brightness of the backlight partition corresponding to the target image sub-region.

[0137] Furthermore, the backlight control system adjusts the second adjusted backlight brightness according to the first maximum brightness value and the first minimum brightness value to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region, as specifically described in steps 5051 to 5054.

[0138] The embodiment of the present invention adjusts the backlight brightness of the backlight partition according to the brightness change gradient direction and the brightness change gradient amplitude, so that the brightness value of the partition edge of the backlight partition can be accurately adjusted, so that the brightness transition can be smoothed and the light interference between adjacent partitions can be reduced, thereby effectively suppressing the generation of halo and improving the display quality of the 2D local backlight dimming of the liquid crystal display.

[0139] In one embodiment, steps 5051 to 5054 are described as follows:

[0140] Step 5051: Determine a backlight brightness impact value based on the first maximum brightness value and the first minimum brightness value.

[0141] Furthermore, the backlight control system determines a backlight brightness impact value according to the first maximum brightness value and the first minimum brightness value, wherein the specific formula of the backlight brightness impact value is:

[0142]

[0143] Step 5052: Determine a comprehensive adjustment parameter based on the first average brightness value, the first maximum brightness value, the first minimum brightness value, the gradient direction influence factor, and the gradient amplitude correction value.

[0144] Furthermore, the backlight control system determines a comprehensive adjustment parameter according to the first average brightness value, the first maximum brightness value, the first minimum brightness value, the gradient direction influence factor and the gradient amplitude correction value, wherein the comprehensive adjustment parameter S x The specific formula is:

[0145]

[0146] Step 5053: Adaptively adjust the second adjusted backlight brightness based on the backlight brightness impact value to obtain a third adjusted backlight brightness.

[0147] Furthermore, the backlight control system adaptively adjusts the second adjusted backlight brightness according to the backlight brightness influence value to obtain a third adjusted backlight brightness, wherein the third adjusted backlight brightness L max-min The specific formula is: L max-min =(1+F x )*L bal , the third adjustment backlight brightness L max-minThis allows the backlight brightness to better adapt to the maximum and minimum differences in brightness within the image sub-area.

[0148] Step 5054 : Adjust the third adjusted backlight brightness based on the comprehensive adjustment parameter to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region.

[0149] Furthermore, the backlight control system adjusts the third adjusted backlight brightness according to the comprehensive adjustment parameter to obtain the adjusted backlight brightness of the backlight partition corresponding to the target image sub-region, wherein the adjusted backlight brightness L sec The specific formula is: L sec =L max-min *(1+S x / 20).

[0150] Therefore, the target backlight brightness L of the backlight partition corresponding to the target image sub-region is target It can be expressed as:

[0151]

[0152] Among them, L min-limit Indicates the minimum limit value of backlight brightness, L max-limit Indicates the maximum limit of backlight brightness.

[0153] The embodiment of the present invention adjusts the backlight brightness of the backlight partition according to the brightness characteristic parameters and the influencing factors corresponding to the brightness change gradient direction and the brightness change gradient amplitude. Therefore, the brightness value of the partition edge of the backlight partition can be accurately adjusted, so that the brightness transition can be smoothed and the light interference between adjacent partitions is reduced, thereby effectively suppressing the generation of halo and improving the display quality of the 2D local backlight dimming of the liquid crystal display.

[0154] Optional, see Figure 3 , Figure 3 This is a diagram of an embodiment of an electronic device provided by an embodiment of the present invention. Figure 3 As shown, an embodiment of the present invention provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor 320. When the processor 320 executes the computer program 311, the following steps are implemented:

[0155] Performing region mapping on the input image to be displayed according to the 2D backlight partition structure of the liquid crystal display to obtain image sub-regions corresponding to each backlight partition;

[0156] For any target image subregion, determining a first brightness characteristic parameter of the target image subregion according to the brightness value of each pixel in the target image subregion;

[0157] Determine the adjacent image sub-region based on the position information of the target image sub-region;

[0158] Performing parameter difference analysis based on the first brightness characteristic parameter and the second brightness characteristic parameter of the adjacent image subregion to obtain the brightness change gradient direction and brightness change gradient amplitude between the target image subregion and the adjacent image subregion;

[0159] The initial backlight brightness of the backlight partition corresponding to the target image sub-region is adjusted based on the first brightness characteristic parameter combined with the brightness change gradient direction and the brightness change gradient amplitude to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region.

[0160] See also Figure 4 , Figure 4 Detailed description of an embodiment of a computer-readable storage medium provided by an embodiment of the present invention. Figure 4 As shown, this embodiment provides a computer-readable storage medium 400 on which a computer program 311 is stored. When the computer program 311 is executed by a processor, the following steps are implemented:

[0161] Performing region mapping on the input image to be displayed according to the 2D backlight partition structure of the liquid crystal display to obtain image sub-regions corresponding to each backlight partition;

[0162] For any target image subregion, determining a first brightness characteristic parameter of the target image subregion according to the brightness value of each pixel in the target image subregion;

[0163] Determine the adjacent image sub-region based on the position information of the target image sub-region;

[0164] Performing parameter difference analysis based on the first brightness characteristic parameter and the second brightness characteristic parameter of the adjacent image subregion to obtain the brightness change gradient direction and brightness change gradient amplitude between the target image subregion and the adjacent image subregion;

[0165] The initial backlight brightness of the backlight partition corresponding to the target image sub-region is adjusted based on the first brightness characteristic parameter combined with the brightness change gradient direction and the brightness change gradient amplitude to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region.

[0166] On the other hand, the present invention further provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can perform the backlight control method for a liquid crystal display provided by each of the above methods. The backlight control method for a liquid crystal display includes:

[0167] Performing region mapping on the input image to be displayed according to the 2D backlight partition structure of the liquid crystal display to obtain image sub-regions corresponding to each backlight partition;

[0168] For any target image subregion, determining a first brightness characteristic parameter of the target image subregion according to the brightness value of each pixel in the target image subregion;

[0169] Determine the adjacent image sub-region based on the position information of the target image sub-region;

[0170] Performing parameter difference analysis based on the first brightness characteristic parameter and the second brightness characteristic parameter of the adjacent image subregion to obtain the brightness change gradient direction and brightness change gradient amplitude between the target image subregion and the adjacent image subregion;

[0171] The initial backlight brightness of the backlight partition corresponding to the target image sub-region is adjusted based on the first brightness characteristic parameter combined with the brightness change gradient direction and the brightness change gradient amplitude to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region.

[0172] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0173] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0174] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A backlight control system for a liquid crystal display, characterized in that: The backlight control center comprises a backlight partition mapping unit, a brightness feature extraction unit, an adjacent partition association unit, a parameter difference analysis unit and a backlight control unit; the backlight control center is connected to the backlight partition mapping unit, the brightness feature extraction unit, the adjacent partition association unit, the parameter difference analysis unit and the backlight control unit respectively to manage and control each unit; A backlight partition mapping unit is used to perform region mapping on the input image to be displayed according to the 2D backlight partition structure of the liquid crystal display screen to obtain an image sub-region corresponding to each backlight partition; a brightness feature extraction unit, configured to determine, for any target image subregion, a first brightness feature parameter of the target image subregion according to the brightness value of each pixel in the target image subregion; an adjacent partition associating unit, configured to determine adjacent image subregions based on position information of the target image subregion; a parameter difference analysis unit, configured to perform parameter difference analysis based on the first brightness characteristic parameter and the second brightness characteristic parameter of the adjacent image subregion, to obtain a brightness change gradient direction and a brightness change gradient amplitude between the target image subregion and the adjacent image subregion; a backlight control unit, configured to adjust the initial backlight brightness of the backlight subregion corresponding to the target image subregion based on the first brightness characteristic parameter in combination with the brightness change gradient direction and the brightness change gradient amplitude, to obtain a target backlight brightness of the backlight subregion corresponding to the target image subregion; The step of adjusting the initial backlight brightness of the backlight partition corresponding to the target image sub-region based on the first brightness characteristic parameter in combination with the brightness change gradient direction and the brightness change gradient amplitude to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region includes: Performing a brightness change analysis based on a first average brightness value, a first maximum brightness value, and a first minimum brightness value in the first brightness characteristic parameter to obtain a brightness change degree value; Calculating a gradient direction influencing factor based on the brightness change gradient direction, and calculating a gradient amplitude correction value based on the brightness change degree value and the brightness change gradient amplitude; Adjusting the initial backlight brightness of the backlight partition corresponding to the target image sub-region based on the gradient direction influencing factor and the gradient amplitude correction value to obtain a first adjusted backlight brightness; Performing a balance adjustment on the first adjusted backlight brightness based on the first average brightness value to obtain a second adjusted backlight brightness; Adjusting the second adjusted backlight brightness based on the first maximum brightness value and the first minimum brightness value to obtain a target backlight brightness of the backlight partition corresponding to the target image sub-region; The adjusting the second adjusted backlight brightness based on the first maximum brightness value and the first minimum brightness value to obtain a target backlight brightness of the backlight partition corresponding to the target image sub-region includes: determining a backlight brightness impact value based on the first maximum brightness value and the first minimum brightness value; determining a comprehensive adjustment parameter based on the first average brightness value, the first maximum brightness value, the first minimum brightness value, the gradient direction influencing factor, and the gradient amplitude correction value; Adaptively adjusting the second adjusted backlight brightness based on the backlight brightness impact value to obtain a third adjusted backlight brightness; The third adjusted backlight brightness is adjusted based on the comprehensive adjustment parameter to obtain a target backlight brightness of the backlight partition corresponding to the target image sub-region.

2. A backlight control method for a liquid crystal display, implemented based on the backlight control system for a liquid crystal display according to claim 1, characterized in that: The backlight control method of the liquid crystal display screen includes: Performing region mapping on the input image to be displayed according to the 2D backlight partition structure of the liquid crystal display to obtain image sub-regions corresponding to each backlight partition; For any target image sub-region, determining a first brightness characteristic parameter of the target image sub-region according to the brightness value of each pixel in the target image sub-region; Determining adjacent image subregions based on position information of the target image subregion; performing parameter difference analysis based on the first brightness characteristic parameter and the second brightness characteristic parameter of the adjacent image subregion, obtaining a brightness change gradient direction and a brightness change gradient amplitude between the target image subregion and the adjacent image subregion; adjusting the initial backlight brightness of the backlight subregion corresponding to the target image subregion based on the first brightness characteristic parameter in combination with the brightness change gradient direction and the brightness change gradient amplitude to obtain a target backlight brightness of the backlight subregion corresponding to the target image subregion; The step of adjusting the initial backlight brightness of the backlight partition corresponding to the target image sub-region based on the first brightness characteristic parameter in combination with the brightness change gradient direction and the brightness change gradient amplitude to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region includes: Performing a brightness change analysis based on a first average brightness value, a first maximum brightness value, and a first minimum brightness value in the first brightness characteristic parameter to obtain a brightness change degree value; Calculating a gradient direction influencing factor based on the brightness change gradient direction, and calculating a gradient amplitude correction value based on the brightness change degree value and the brightness change gradient amplitude; Adjusting the initial backlight brightness of the backlight partition corresponding to the target image sub-region based on the gradient direction influencing factor and the gradient amplitude correction value to obtain a first adjusted backlight brightness; Performing a balance adjustment on the first adjusted backlight brightness based on the first average brightness value to obtain a second adjusted backlight brightness; Adjusting the second adjusted backlight brightness based on the first maximum brightness value and the first minimum brightness value to obtain a target backlight brightness of the backlight partition corresponding to the target image sub-region; The adjusting the second adjusted backlight brightness based on the first maximum brightness value and the first minimum brightness value to obtain a target backlight brightness of the backlight partition corresponding to the target image sub-region includes: determining a backlight brightness impact value based on the first maximum brightness value and the first minimum brightness value; determining a comprehensive adjustment parameter based on the first average brightness value, the first maximum brightness value, the first minimum brightness value, the gradient direction influencing factor, and the gradient amplitude correction value; Adaptively adjusting the second adjusted backlight brightness based on the backlight brightness impact value to obtain a third adjusted backlight brightness; The third adjusted backlight brightness is adjusted based on the comprehensive adjustment parameter to obtain a target backlight brightness of the backlight partition corresponding to the target image sub-region.

3. The backlight control method of a liquid crystal display according to claim 2, wherein: Determining a first brightness characteristic parameter of the target image subregion according to the brightness value of each pixel in the target image subregion includes: Performing a logarithmic transformation on the brightness value of each pixel in the target image subregion to obtain a transformed brightness value of each pixel in the target image subregion; Performing a difference analysis based on the brightness value of each pixel in the target image subregion and the brightness values ​​of the neighboring pixels corresponding to each pixel to obtain a local neighborhood brightness difference value of each pixel; Performing a fusion analysis based on the transformed brightness value of each pixel in the target image subregion and the local neighborhood brightness difference value to obtain a fused brightness value of each pixel; Parameter analysis is performed based on the fused brightness value of each pixel in the target image sub-region to obtain a first brightness feature parameter of the target image sub-region.

4. The backlight control method of a liquid crystal display according to claim 2, wherein: The performing parameter difference analysis based on the first brightness characteristic parameter and the second brightness characteristic parameter of the adjacent image sub-region to obtain the brightness change gradient direction and brightness change gradient amplitude between the target image sub-region and the adjacent image sub-region includes: Initialize parameters based on the first average brightness value, the first maximum brightness value, and the first minimum brightness value in the first brightness characteristic parameter to obtain a brightness deviation factor; Based on the first average brightness value and the second average brightness value in the second brightness characteristic parameter, respectively combining the brightness value of each pixel in the target image subregion and the brightness value of each pixel in the adjacent image subregion, to perform brightness fluctuation correction, thereby obtaining a first brightness fluctuation correction coefficient for the target image subregion and a second brightness fluctuation correction coefficient for the adjacent image subregion; Correcting a difference between the first average brightness value and the second average brightness value based on the brightness deviation factor, the first brightness fluctuation correction coefficient, and the second brightness fluctuation correction coefficient to obtain a corrected average brightness value; A parameter difference analysis is performed based on the corrected average brightness value in combination with the first maximum brightness value and the first minimum brightness value, as well as the second maximum brightness value and the second minimum brightness value in the second brightness characteristic parameter to obtain the brightness change gradient direction and the brightness change gradient amplitude.

5. The backlight control method of a liquid crystal display according to claim 4, wherein: The performing parameter difference analysis based on the corrected average brightness value in combination with the first maximum brightness value and the first minimum brightness value, and the second maximum brightness value and the second minimum brightness value in the second brightness characteristic parameter to obtain the brightness change gradient direction and the brightness change gradient amplitude includes: Performing a comprehensive difference calculation based on the first maximum brightness value, the first minimum brightness value, the second maximum brightness value, and the second minimum brightness value to obtain a comprehensive brightness difference index; The horizontal direction of the liquid crystal display is set as the horizontal axis and the vertical direction is set as the vertical axis. The direction is calculated in combination with the corrected average brightness value to obtain the brightness change gradient direction; A gradient amplitude calculation is performed based on the comprehensive brightness difference index, the brightness change gradient direction and the corrected average brightness value to obtain the brightness change gradient amplitude.

6. The backlight control method of a liquid crystal display according to any one of claims 2 to 5, characterized in that: The step of performing region mapping on the input image to be displayed according to the 2D backlight partition structure of the liquid crystal display screen to obtain an image sub-region corresponding to each backlight partition includes: Based on the display screen size and display screen resolution of the liquid crystal display screen, adaptively adjusting the image size and image resolution of the image to be displayed to obtain an adjusted image; Based on the position coordinates of each pixel point in the adjusted image in the image coordinate system, and in combination with a mapping relationship between the image coordinate system and the display screen coordinate system of the liquid crystal display screen, mapping each pixel point in the adjusted image to the display screen coordinate system; The adjusted image is region-mapped according to the coordinate region of each backlight partition in the 2D backlight partition structure in the display screen coordinate system to obtain an image sub-region corresponding to each backlight partition.

7. An electronic device comprising: A memory and a processor, characterized in that a computer software program is stored in the memory, and when the processor reads and executes the computer software program, the backlight control method of the liquid crystal display according to any one of claims 2 to 6 is implemented.

8. A non-transitory computer-readable storage medium, characterized in that The storage medium stores a computer software program, and when the computer software program is executed by the processor, the backlight control method of the liquid crystal display screen according to any one of claims 2 to 6 is implemented.

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