Backlight control system and method of liquid crystal display screen

Abstract

The invention provides a backlight control system and method of a liquid crystal display screen. The system comprises a backlight control center device, 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 partition mapping unit maps an image to be displayed to an image sub-region of a backlight partition; the brightness feature extraction unit determines a first brightness feature parameter; the adjacent partition association unit determines adjacent image sub-regions; the parameter difference analysis unit performs parameter difference analysis based on the first brightness characteristic parameter and the second brightness characteristic parameter to obtain a brightness change gradient direction and a brightness change gradient amplitude; and the backlight control unit adjusts the initial backlight brightness 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. According to the invention, the generation of halo is effectively inhibited, and the display quality of 2D local backlight dimming of the liquid crystal display screen is improved.

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 of a liquid crystal display screen. Background Art

[0002] In the field of LCD screens, partitioned backlight modulation is a widely used backlight control method that can improve the display contrast and image quality to a certain extent. In particular, 2D local dimming technology achieves a higher light-dark contrast by mapping the backlight area into multiple partitions, 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 look and feel of the picture and the display quality. This is because it is difficult to accurately control the brightness of each partition when controlling the backlight of small partitions, and the light between adjacent partitions is prone to interfere 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 the 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 backlight dimming 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 respectively 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 to manage and control each unit;

[0006] A backlight partition mapping unit, 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 sub-region, a first brightness feature parameter of the target image sub-region according to the brightness value of each pixel in the target image sub-region;

[0008] An adjacent partition association unit, configured to determine an adjacent image sub-region based on the position information of the target image sub-region;

[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 sub-region, to obtain a brightness change gradient direction and a brightness change gradient amplitude between the target image sub-region and the adjacent image sub-region;

[0010] A backlight control unit is used to adjust 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 the brightness change gradient amplitude to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region.

[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, and 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 screen to obtain an image sub-region 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] Determine an adjacent image sub-region based on the position information of the target image sub-region;

[0015] 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 a brightness change gradient direction and a brightness change gradient amplitude between the target image sub-region and the adjacent image sub-region;

[0016] 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.

[0017] In a third aspect, the present invention further provides an electronic device, comprising: a memory for storing a computer software program; a processor for reading and executing the computer software program, thereby implementing any of the above-mentioned 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 a 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, including a computer program, which implements any of the above-mentioned backlight control methods for liquid crystal display screens when the computer program is 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, and 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 can be 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 It is a structural diagram of the backlight control system of the liquid crystal display screen provided by the present invention;

[0022] Figure 2 It is a flow chart of the backlight control method of the liquid crystal display screen 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 An embodiment diagram of a computer-readable storage medium provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are 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 as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the description of the present invention, the term "for example" is used to mean "used as an example, illustration or explanation". Any embodiment described as "for example" in the present invention is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any technician in the field 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 will not be 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 in the present invention.

[0028] Optional, see Figure 1 As shown, Figure 1 It 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 respectively 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 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 a plurality of rectangular or other shaped backlight partitions, and therefore, 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-region in the image, and the sub-region contains all the pixels 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 pixels corresponding to the upper left corner of the image are divided out to form the first image sub-region; and by analogy, the entire image is divided into 16 image sub-regions, each sub-region corresponding 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 parameter may reflect information such as the overall brightness level and brightness distribution of the sub-region. Therefore, the first brightness characteristic parameter in the embodiment of the present invention includes a first average brightness value, a first maximum brightness value, and a first minimum brightness value.

[0032] Optionally, each target image sub-region includes position information of the backlight region in which it is located, and therefore, the adjacent partition association unit determines its adjacent image sub-region based on the position information of the target image sub-region, wherein the adjacent image sub-region in the embodiment of the present invention may 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 the 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 embodiment of the present invention performs backlight partition mapping and brightness feature extraction on the image, and 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 can be reduced, thereby effectively suppressing the generation of halo, thereby improving the display quality of 2D local backlight dimming of the liquid crystal display.

[0038] Optional, see Figure 2 , Figure 2 : is a flow chart of the backlight control method of the liquid crystal display screen provided by the present invention. The execution subject of the backlight control method of the liquid crystal display screen in the embodiment of the present invention is the backlight control system, therefore, the backlight control method of the liquid crystal display screen 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, the liquid crystal display screen usually has a 2D backlight partition structure, that is, the entire backlight area is divided into a plurality of rectangular or other shaped backlight partitions, and therefore, the input image to be displayed needs to be divided according to the backlight partition structure. Therefore, the backlight control system 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 includes all pixel points within the coverage range of the backlight partition, as described in steps 101 to 103.

[0041] 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, a certain range of pixel points corresponding to the upper left corner of the image are divided out to form the first image sub-region; and so on, the entire image is divided into 16 image sub-regions, each sub-region 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] Further, 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 described in steps 201 to 204 .

[0044] The brightness characteristic parameter may reflect information such as the overall brightness level and brightness distribution of the sub-region. Therefore, the first brightness characteristic parameter in the embodiment of the present invention includes 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, so 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 may 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, and obtaining 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 the 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 embodiment of the present invention performs backlight partition mapping and brightness feature extraction on the image, and 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 can be reduced, thereby effectively suppressing the generation of halo, thereby improving the display quality of 2D local backlight dimming of the liquid crystal display.

[0054] In one embodiment, the description of steps 101 to 103 is as follows:

[0055] Step 101 : Based on the screen size and screen resolution of the liquid crystal display screen, 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 sizes, such as length and width) and screen resolutions (the number of pixels in the horizontal and vertical directions). The image size and image resolution of the image to be displayed may not match the screen size and screen resolution of the LCD screen. In order to correctly display the image on the LCD screen, the image needs to be adapted and adjusted.

[0057] Therefore, the backlight control system obtains the display screen size and display screen resolution of the liquid crystal display screen, as well as the image size and image resolution of the image to be displayed, and according to the display screen size and display screen resolution of the liquid crystal display screen, the image size and image resolution of the image to be displayed are respectively adapted and adjusted to obtain the adjusted image, wherein, when adjusting the image size, it is necessary to consider maintaining the aspect ratio of the image to avoid image deformation. When adjusting the resolution, operations such as resampling of pixel points may be involved so that the number of pixels of the image meets the resolution requirements of the display screen. In one embodiment, there is a liquid crystal display screen with a display screen size of 20 cm long and 15 cm wide, and a display screen resolution of 1920*1080. The image size of the image to be displayed is 10 cm long and 8 cm wide, and the image resolution is 1280*720. First, the aspect ratio of the display screen is calculated to be 20 / 15=4 / 3, and the aspect ratio of the image is 10 / 8=5 / 4. In order to adapt to the display screen size and keep the image content intact, scaling is performed based on the shorter side (width) of the image. Assume that the scaling factor is k, the number of pixels corresponding to the display width is 1080, and the number of pixels corresponding to the image width is 720, then k = 1080 / 720 = 1.5. Multiply the length and width of the image by the scaling factor 1.5 respectively, and the new image size is 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 , based on the position coordinates of each pixel in the adjusted image in the image coordinate system and in combination with the mapping relationship between the image coordinate system and the display screen coordinate system of the liquid crystal display screen, each pixel in the adjusted image is mapped to the display screen coordinate system.

[0059] Furthermore, the image has its own coordinate system, usually with the upper left corner of the image as the origin (0, 0), the horizontal rightward direction as the positive direction of the x-axis, and the vertical downward direction as the positive direction of the y-axis. The LCD screen also has its own coordinate system, with its origin position, coordinate axis direction, and unit length, etc. The image coordinate system and the display screen coordinate system are different coordinate systems. Therefore, in order to correctly display the pixels in the adjusted image on the display screen, it is necessary to establish a mapping relationship between the image coordinate system and the display screen coordinate system in advance. The mapping relationship is related to the coordinate system origin position of the image coordinate system and the display screen coordinate system, as well as the display screen resolution and the 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 point with coordinates (x, y) in the adjusted image, the conversion formula of the coordinates (x', y') in the display screen coordinate system is: x'=x, y'=1080-y. For example, if the coordinates of a pixel point 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 pixel points of the adjusted image to the display screen coordinate system, the backlight control system groups the pixel points falling within the coordinate area range of each backlight partition into a group according to the coordinate area range of each backlight partition to form an image sub-area corresponding to the backlight partition. In one embodiment, the display screen is divided into a 3*3 2D backlight partition structure. The coordinate area of ​​each backlight partition in the display screen coordinate system is as follows: the coordinate range of the upper left corner partition is x from 0 to 640, y from 0 to 360; the coordinate range of the middle partition directly above is x from 640 to 1280, y from 0 to 360, etc. For the adjusted image that has been mapped to the display screen coordinate system, traverse each pixel point in the image to determine whether its coordinates are within the coordinate area of ​​a certain backlight partition. For example, a pixel point with coordinates of (300, 200) falls within the coordinate area of ​​the upper left backlight partition, and is classified as the image sub-area corresponding to the upper left backlight partition. By judging and classifying all pixel points, 9 image sub-areas corresponding to each backlight partition are obtained.

[0065] The embodiments of the present invention realize the precise adaptation of the to-be-displayed image 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 problem of unnatural brightness transition caused by unified brightness control, thereby effectively suppressing the generation of halo.

[0066] In one embodiment, the description of steps 201 to 204 is 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] Among them, 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 in the target image sub-area as the center, and the preset range area is the neighborhood of each pixel, 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 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 values ​​of the neighborhood pixels corresponding to each pixel, that is, calculates the brightness value of each pixel and the brightness difference between the brightness values ​​of each neighborhood pixel, and calculates the local neighborhood brightness difference of each pixel by combining the average difference and each brightness difference.

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

[0075] Step 203 , performing fusion analysis based on the transformed brightness value of each pixel in the target image sub-region and the local neighborhood brightness difference value 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 value 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] Where 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 sub-region 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 characteristic parameter of the target image sub-region.

[0080] Furthermore, the backlight control system performs parameter analysis on the fused brightness value of each pixel in the target image sub-area to obtain a first brightness characteristic parameter of the target image sub-area, wherein the parameter analysis includes an average brightness value analysis, a maximum brightness value analysis, and a minimum brightness value analysis. Therefore, the first brightness characteristic parameter 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 brightness characteristic parameters that comprehensively and accurately 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 problem of unnatural brightness transition caused by unified brightness control, thereby effectively suppressing the generation of halo and improving the display quality of 2D local backlight dimming of the liquid crystal display.

[0082] In one embodiment, the description of steps 401 to 404 is as follows:

[0083] Step 401 , initializing 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 in the target image sub-region and the brightness value of each pixel in the adjacent image sub-region to perform brightness fluctuation correction, and obtain the first brightness fluctuation correction coefficient of the target image sub-region and the second brightness fluctuation correction coefficient of the adjacent image sub-region.

[0088] Optionally, for the adjacent image subregion, the adjacent image subregion 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 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 of the target image sub-region, wherein 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 target image sub-region, Represents the brightness value of each pixel in the target image sub-region.

[0092] Furthermore, the backlight control system performs 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 the second brightness fluctuation correction coefficient of the upper adjacent image sub-region, wherein the specific formula of 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 combined 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.

[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 described in steps 4041 to 4043.

[0102] The embodiments 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, and provide 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 can be reduced, thereby effectively suppressing the generation of halo and improving the display quality of 2D local back dimming of the liquid crystal display.

[0103] In one embodiment, the description of steps 4041 to 4043 is as follows:

[0104] Step 4041, performing 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] Further, 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 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 to obtain the adjusted brightness difference index, the adjusted brightness difference index for:

[0110]

[0111] Step 4042, taking the horizontal direction set by the liquid crystal display as the horizontal axis and the vertical direction as the vertical axis, and combining the corrected average brightness value to perform direction calculation, 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 calculate the direction 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 two dimensions and can more accurately reflect the directional trend of brightness changes.

[0115] Step 4043, calculate the gradient amplitude 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, where the brightness change gradient amplitude A u The specific formula is:

[0117]

[0118] The embodiments of the present invention can accurately determine the brightness change gradient direction and the brightness change gradient amplitude, and provide a data basis for the subsequent adjustment of the backlight brightness of the backlight partition 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 2D local back dimming of the liquid crystal display.

[0119] In one embodiment, the description of steps 501 to 505 is as follows:

[0120] Step 501 : Perform 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 brightness change analysis according to 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, where 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 according to 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 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.

[0129] Further, 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 : Balance-adjust the first adjusted backlight brightness based on the first average brightness value to obtain a second adjusted backlight brightness.

[0132] Further, 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] Further, 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 2D local back dimming of the liquid crystal display.

[0139] In one embodiment, the description of steps 5051 to 5054 is 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] Further, the backlight control system determines the backlight brightness influence value according to the first maximum brightness value and the first minimum brightness value, wherein the specific formula of the backlight brightness influence 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 influence value to obtain a third adjusted backlight brightness.

[0147] Further, 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] Further, 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 can be reduced, thereby effectively suppressing the generation of halo and improving the display quality of 2D local back dimming of the liquid crystal display.

[0154] Optional, see Figure 3 , Figure 3 FIG. 1 is an embodiment diagram 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 screen to obtain an image sub-region corresponding to each backlight partition;

[0156] 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;

[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 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;

[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 screen to obtain an image sub-region corresponding to each backlight partition;

[0162] 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;

[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 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;

[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 in a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the backlight control method of the liquid crystal display provided by the above methods. The backlight control method of the 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 screen to obtain an image sub-region corresponding to each backlight partition;

[0168] 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;

[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 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;

[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, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0173] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for 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 some 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 embodiments of the present invention.

Claims

1. A backlight control system for a liquid crystal display, characterized in that: It 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 respectively 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 to manage and control each unit; A backlight partition mapping unit, 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 sub-region, a first brightness feature parameter of the target image sub-region according to the brightness value of each pixel in the target image sub-region; An adjacent partition association unit, configured to determine an adjacent image sub-region based on the position information of the target image sub-region; 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 sub-region, to obtain a brightness change gradient direction and a brightness change gradient amplitude between the target image sub-region and the adjacent image sub-region; A backlight control unit is used to adjust 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 the brightness change gradient amplitude to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region.

2. A backlight control method for a liquid crystal display screen, implemented based on the backlight control system of the liquid crystal display screen according to claim 1, characterized in that: The backlight control method of the liquid crystal display screen comprises: 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; 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; Determine an adjacent image sub-region based on the position information of the target image sub-region; 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 a brightness change gradient direction and a brightness change gradient amplitude between the target image sub-region and the adjacent image sub-region; 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.

3. The backlight control method of a liquid crystal display screen according to claim 2, characterized in that: The step of 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 comprises: 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; Perform 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; Performing a fusion analysis based on the transformed brightness value of each pixel in the target image sub-region 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 characteristic parameter of the target image sub-region.

4. The backlight control method of a liquid crystal display according to claim 2, characterized in that: 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 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 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, so as to obtain a first brightness fluctuation correction coefficient of the target image subregion and a second brightness fluctuation correction coefficient of the adjacent image subregion; Based on the brightness deviation factor, the first brightness fluctuation correction coefficient, and the second brightness fluctuation correction coefficient, correcting the difference between the first average brightness value and the second average brightness value to obtain a corrected average brightness value; Based on the corrected average brightness value combined 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, parameter difference analysis is performed to obtain the brightness change gradient direction and the brightness change gradient amplitude.

5. The backlight control method of a liquid crystal display screen according to claim 4, characterized in that: The step of 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 set by the liquid crystal display screen is used as the horizontal axis, the vertical direction is used as the vertical axis, and the direction is calculated in combination with the corrected average brightness value to obtain the brightness change gradient direction; The gradient amplitude is calculated 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 screen according to claim 2, characterized in that: 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: Perform brightness change analysis 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 change degree value; 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; 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; The second adjusted backlight brightness is adjusted 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.

7. The backlight control method of a liquid crystal display screen according to claim 6, characterized in that: 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: Determine a backlight brightness influence 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 influence value to obtain a third adjusted backlight brightness; The third adjusted backlight brightness is adjusted based on the comprehensive adjustment parameter to obtain the target backlight brightness of the backlight partition corresponding to the target image sub-region.

8. The backlight control method of a liquid crystal display screen according to any one of claims 2 to 7, characterized in that: The input image to be displayed is region mapped according to the 2D backlight partition structure of the liquid crystal display screen to obtain an image sub-region corresponding to each backlight partition, including: Based on the display screen size and the display screen resolution of the liquid crystal display screen, adaptively adjusting the image size and the 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 the mapping relationship between the image coordinate system and the display screen coordinate system of the liquid crystal display screen, each pixel point in the adjusted image is mapped to the display screen coordinate system; The adjusted image is region-mapped in the coordinate region of the display screen coordinate system according to each backlight partition in the 2D backlight partition structure to obtain an image sub-region corresponding to each backlight partition.

9. 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 screen as described in any one of claims 2 to 8 is implemented.

10. 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 8 is implemented.

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