A driving method, system and storage medium for a high-contrast Mini LED backlight module

Abstract

The present invention provides a driving method, system, and storage medium for a high-contrast Mini LED backlight module. Based on the array arrangement rules of the backlight module, the system divides the module into independent partitions and obtains channel information. The system analyzes the brightness distribution of the input image based on a preset backlight refresh frequency, and determines the first target brightness information for each partition through histogram statistics and metadata analysis. Subsequently, the system detects the brightness deviation of adjacent partitions, uses a gradient interpolation algorithm to smooth areas exceeding a preset threshold, and generates second target brightness information to suppress the halo effect. The system also configures constant current output and PWM duty cycle based on a reference current and a floating current, achieving fine dimming in low-brightness areas and stable output in high-brightness areas. Furthermore, the system collects standard brightness data through a factory calibration mode to generate a compensation coefficient matrix, dynamically correcting the partition brightness during operation. A temperature sensor is used to monitor and compensate for brightness attenuation caused by temperature rise in real time, ensuring brightness uniformity.

Description

Technical Field

[0001] The present invention relates to the field of Mini LEDs, and more specifically, to a driving method, system, and storage medium for a high-contrast Mini LED backlight module. Background Art

[0002] Although Mini LED backlight technology currently offers improvements in display contrast and brightness compared to traditional LEDs, its performance is still limited by existing driver solutions and suffers from the following key drawbacks:

[0003] First, due to the insufficient zoning accuracy of traditional Mini LED backlight modules and the lag in dynamic dimming algorithms, it is difficult to achieve pixel-level light control, resulting in dark field light leakage and halo effects, which cannot meet the requirements of HDR content for the coexistence of high-brightness details and pure black scenes.

[0004] Secondly, since the existing driving technology relies heavily on single PWM dimming or constant current dimming, it is easy to cause low-frequency flicker or color temperature shift at low brightness. At high brightness, the current overload exacerbates the temperature rise of the Mini LED, accelerating light decay and color temperature drift.

[0005] Third, existing solutions lack dynamic temperature compensation and correction mechanisms. Mini LED arrays are prone to uneven brightness due to manufacturing tolerances and heat generation, resulting in visible spots or dark areas on the display panel.

[0006] Therefore, there is an urgent need for a backlight driving technology applied to Mini LEDs to improve display performance. Summary of the Invention

[0007] In view of the above problems, the purpose of the present invention is to provide a driving method, system and storage medium for a high-contrast Mini LED backlight module. First, based on the array arrangement rules of the backlight module, independent partitions are divided and channel information is obtained. The brightness distribution of the input image is analyzed in combination with the preset backlight refresh frequency. The first target brightness information of each partition is determined through histogram statistics and metadata analysis. Subsequently, the brightness deviation of adjacent partitions is detected, and the areas exceeding the preset threshold are smoothed using a gradient interpolation algorithm to generate second target brightness information to suppress the halo effect. At the same time, the constant current output and PWM duty cycle are configured respectively based on the reference current and floating current to achieve fine dimming in low-brightness areas and stable output in high-brightness areas. In addition, the standard brightness data is collected through the factory calibration mode to generate a compensation coefficient matrix. The brightness of the partitions is dynamically corrected during operation. In combination with the temperature sensor, the brightness attenuation caused by temperature rise is monitored and compensated in real time to ensure brightness uniformity.

[0008] A first aspect of the present invention provides a method for driving a high-contrast Mini LED backlight module, the method comprising:

[0009] Based on a preset backlight module array arrangement rule, obtaining first channel information of the partition;

[0010] Obtaining image information based on a preset backlight refresh frequency;

[0011] Obtaining first target brightness information according to the image information based on the metadata and a preset histogram statistical logic;

[0012] Detecting target brightness deviations of adjacent subareas based on the first target brightness information, and obtaining second target brightness information based on a preset coupling suppression algorithm;

[0013] obtaining reference current information and floating current information according to the second target brightness information;

[0014] Configuring a dimming constant current output of a backlight module of a corresponding partition according to the first channel information and the reference current information;

[0015] The dimming PWM duty cycle of the backlight module of the corresponding partition is configured according to the first channel information and the floating current information.

[0016] In this solution, the metadata specifically includes:

[0017] Obtaining first brightness information based on the maximum brightness of the current frame image;

[0018] Obtaining second brightness information based on an average value of maximum brightness of a preset number of picture frame images;

[0019] determining whether the first brightness information is greater than the second brightness information;

[0020] If so, calculating the difference between the first brightness information and the second brightness information to obtain a first brightness deviation value;

[0021] Calculating a ratio of the first brightness deviation value to the second brightness information to obtain a first deviation ratio;

[0022] Determining whether the first deviation ratio exceeds a preset deviation ratio threshold;

[0023] If so, compress the first brightness information according to the second brightness information.

[0024] In this solution, the metadata and the preset histogram statistical logic are used to obtain the first target brightness information according to the image information, specifically:

[0025] Based on histogram statistics of the image information, dividing the image into at least three brightness intervals according to the second brightness information;

[0026] Obtaining a partition brightness value according to the image information and the first channel information;

[0027] According to the partition brightness value, the brightness interval is compared to obtain a first reference brightness of the first target brightness information;

[0028] Determining whether the partition brightness value exceeds the first brightness information;

[0029] If yes, compressing the partition brightness value according to the first brightness information;

[0030] A difference between the partition brightness value and a first reference brightness of the first target brightness information is calculated to obtain a first floating brightness of the first target brightness information.

[0031] In this solution, the target brightness deviation of adjacent partitions is detected based on the first target brightness information, and the second target brightness information is obtained based on a preset coupling suppression algorithm, specifically:

[0032] A first target brightness curve and a second target brightness curve are obtained based on the horizontal and vertical arrangement of the backlight module array;

[0033] Determining whether a target brightness deviation of adjacent subareas on the first target brightness curve or the second target brightness curve exceeds a preset first brightness deviation threshold;

[0034] If so, based on a preset gradient interpolation algorithm and according to the corresponding target brightness curve, a gradient adjustment value of the first target brightness information is calculated to obtain the second target brightness information.

[0035] This plan also includes:

[0036] When in calibration mode;

[0037] Based on a preset standard brightness picture, standard brightness information is obtained through an optical measuring device;

[0038] Calculating the difference between the second target brightness information and the standard brightness information to obtain a first compensation coefficient matrix;

[0039] When in run mode;

[0040] Obtaining a first compensation coefficient according to the first channel information and the first compensation coefficient matrix;

[0041] The first floating brightness of the first target brightness information is corrected according to the first compensation coefficient.

[0042] This plan also includes:

[0043] Obtaining first temperature information of a target partition;

[0044] Obtaining a first brightness attenuation coefficient based on a preset temperature-brightness attenuation curve;

[0045] The first floating brightness of the first target brightness information is corrected according to the first brightness attenuation coefficient.

[0046] A second aspect of the present invention provides a driving system for a high-contrast Mini LED backlight module, including a driving method program for the high-contrast Mini LED backlight module. When the driving method program for the high-contrast Mini LED backlight module is executed by the processor, the following steps are implemented:

[0047] Based on a preset backlight module array arrangement rule, obtaining first channel information of the partition;

[0048] Obtaining image information based on a preset backlight refresh frequency;

[0049] Obtaining first target brightness information according to the image information based on the metadata and a preset histogram statistical logic;

[0050] Detecting target brightness deviations of adjacent subareas based on the first target brightness information, and obtaining second target brightness information based on a preset coupling suppression algorithm;

[0051] obtaining reference current information and floating current information according to the second target brightness information;

[0052] Configuring a dimming constant current output of a backlight module of a corresponding partition according to the first channel information and the reference current information;

[0053] The dimming PWM duty cycle of the backlight module of the corresponding partition is configured according to the first channel information and the floating current information.

[0054] In this solution, the first brightness information is obtained based on the maximum brightness of the current frame image;

[0055] Obtaining second brightness information based on an average value of maximum brightness of a preset number of picture frame images;

[0056] determining whether the first brightness information is greater than the second brightness information;

[0057] If so, calculating the difference between the first brightness information and the second brightness information to obtain a first brightness deviation value;

[0058] Calculating a ratio of the first brightness deviation value to the second brightness information to obtain a first deviation ratio;

[0059] Determining whether the first deviation ratio exceeds a preset deviation ratio threshold;

[0060] If so, compress the first brightness information according to the second brightness information.

[0061] In this solution, the metadata and the preset histogram statistical logic are used to obtain the first target brightness information according to the image information, specifically:

[0062] Based on histogram statistics of the image information, dividing the image into at least three brightness intervals according to the second brightness information;

[0063] Obtaining a partition brightness value according to the image information and the first channel information;

[0064] According to the partition brightness value, the brightness interval is compared to obtain a first reference brightness of the first target brightness information;

[0065] Determining whether the partition brightness value exceeds the first brightness information;

[0066] If yes, compressing the partition brightness value according to the first brightness information;

[0067] A difference between the partition brightness value and a first reference brightness of the first target brightness information is calculated to obtain a first floating brightness of the first target brightness information.

[0068] A third aspect of the present invention provides a computer-readable storage medium, which includes a driving method program for a high-contrast Mini LED backlight module. When the driving method program for the high-contrast Mini LED backlight module is executed by a processor, the steps of the driving method for the high-contrast Mini LED backlight module as described in any one of the above items are implemented.

[0069] The present invention provides a driving method, system, and storage medium for a high-contrast Mini LED backlight module. First, independent partitions are divided based on the array arrangement rules of the backlight module and channel information is obtained. The brightness distribution of the input image is analyzed in combination with a preset backlight refresh frequency. The first target brightness information for each partition is determined through histogram statistics and metadata analysis. Subsequently, the brightness deviation of adjacent partitions is detected, and a gradient interpolation algorithm is used to smooth areas exceeding a preset threshold to generate second target brightness information to suppress the halo effect. At the same time, constant current output and PWM duty cycle are configured based on a reference current and a floating current, respectively, to achieve fine dimming in low-brightness areas and stable output in high-brightness areas. Furthermore, a compensation coefficient matrix is generated by collecting standard brightness data in a factory calibration mode. The partition brightness is dynamically corrected during operation. A temperature sensor is used to monitor and compensate for brightness attenuation caused by temperature rise in real time to ensure brightness uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope.

[0071] Figure 1 A flowchart showing a method for driving a high-contrast Mini LED backlight module according to the present invention is shown;

[0072] Figure 2 A flowchart of metadata confirmation provided by an embodiment of the present invention is shown;

[0073] Figure 3 A flowchart for confirming first target brightness information provided by an embodiment of the present invention is shown;

[0074] Figure 4 A block diagram of a driving system for a high-contrast Mini LED backlight module of the present invention is shown. DETAILED DESCRIPTION

[0075] 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0076] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined in this manner in the embodiments of the present invention.

[0077] The words "first", "second" and similar terms used in the embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Similarly, words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps before or after the method of the embodiment of the present invention do not necessarily have to be performed in exact order. On the contrary, the various steps may be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more steps may be removed from these processes.

[0078] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0079] Figure 1 A flow chart of a driving method of a high-contrast Mini LED backlight module of the present invention is shown.

[0080] like Figure 1 As shown, the first aspect of the present invention discloses a driving method for a high-contrast Mini LED backlight module, the method comprising:

[0081] S102, obtaining first channel information of the partition based on a preset backlight module array arrangement rule;

[0082] S104, obtaining image information based on a preset backlight refresh frequency;

[0083] S106, obtaining first target brightness information according to the image information based on the metadata and a preset histogram statistical logic;

[0084] S108, detecting target brightness deviations of adjacent subareas based on the first target brightness information, and obtaining second target brightness information based on a preset coupling suppression algorithm;

[0085] S110, obtaining reference current information and floating current information according to the second target brightness information;

[0086] S112, configuring a dimming constant current output of a backlight module of a corresponding partition according to the first channel information and the reference current information;

[0087] S114 , configuring a dimming PWM duty cycle of a backlight module corresponding to a partition according to the first channel information and the floating current information.

[0088] It should be noted that the first channel information is the channel number of the backlight module; the image information is the brightness distribution diagram of the image to be displayed; the first target brightness information is the initial value of the target backlight brightness; the second target brightness information is the calibration value of the target backlight brightness; the reference current information is the constant current component of the backlight module dimming current; and the floating current information is the dynamic current adjustment value based on PWM dimming. The metadata includes at least the maximum brightness value of the screen image (MaxCLL) and the average maximum brightness value of a group of screen images (MaxFALL).

[0089] In this embodiment, a backlight driving process of a high-contrast Mini LED backlight module is provided. Based on the arrangement rules of the Mini LED backlight module array, the channel number of each backlight module is obtained; wherein, in the application of the present invention, the backlight module is usually divided into 512 to 2048 independently controllable rectangular partitions, each partition contains 8×8 to 32×32 Mini LEDs, and an active matrix driving circuit is used to configure an independent driving channel for each partition. When driving the backlight, first, according to the backlight refresh, the brightness distribution diagram of the image to be displayed is determined. Secondly, metadata and histogram statistics are obtained through image recognition analysis to calculate the initial value of the target backlight brightness of the backlight module corresponding to each channel number, that is, the first target brightness information. Then, according to the deviation value of the target brightness of the adjacent partitions, the target brightness is corrected according to the preset gradient algorithm to obtain the correction of the target backlight brightness of the backlight module corresponding to each channel number, that is, the second target brightness information. Finally, based on the second target brightness information, the constant current component and floating component of the backlight current are determined. The backlight module's constant current output is adjusted based on the constant current component, while the dimming PWM duty cycle is adjusted based on the floating component. This improves dimming resolution, achieving fine dimming in low-brightness areas and stable output in high-brightness areas. In other words, the constant current component reduces the scale interval of the floating component, thereby improving dimming resolution. For example, for a brightness range of [0, 100], the constant current component is set to [0, 20, 40, 60, 80, 100], and the dimming PWM precision is 10-bit. If dimming is performed solely using the constant current component, the brightness resolution is 20; if dimming is performed solely using PWM, the brightness resolution is 100 / 1024 ≈ 0.1; and if dimming is performed in conjunction with the constant current component and dimming PWM, the brightness resolution is 20 / 1024 ≈ 0.02. This shows that combined dimming using the constant current and floating components can significantly improve dimming resolution.

[0090] Figure 2A flowchart of metadata confirmation provided by an embodiment of the present invention is shown.

[0091] According to an embodiment of the present invention, Figure 2 As shown, the metadata specifically includes:

[0092] S202, obtaining first brightness information based on the maximum brightness of the current frame image;

[0093] S204, obtaining second brightness information based on an average value of the highest brightness of a preset number of picture frame images;

[0094] S206, determining whether the first brightness information is greater than the second brightness information;

[0095] S208, if yes, calculating the difference between the first brightness information and the second brightness information to obtain a first brightness deviation value;

[0096] S210, calculating a ratio of the first brightness deviation value to the second brightness information to obtain a first deviation ratio;

[0097] S212, determining whether the first deviation ratio exceeds a preset deviation ratio threshold;

[0098] S214: If yes, compress the first brightness information according to the second brightness information.

[0099] It should be noted that the first brightness information is the maximum brightness value of the screen image, recorded as MaxCLL, which is used to determine the brightness level that the brightest part of the screen can reach and is an important reference for the display device when displaying highlights. The second brightness information is the average of the maximum brightness of a group of screen images, recorded as MaxFALL, which is used to reflect the average peak brightness of the entire screen and helps the display device to reasonably adjust and optimize the overall brightness of the screen.

[0100] In this embodiment, the metadata confirmation process is as follows: first brightness information and second brightness information are obtained based on a frame image; if the first brightness information is greater than the second brightness information, a first deviation ratio is calculated; if the first deviation ratio exceeds a preset deviation ratio threshold, the first brightness information is compressed based on the second brightness information. If the first brightness information is not greater than the second brightness information, the first brightness information does not need to be adjusted.

[0101] As an embodiment, the present invention determines a maximum luminance value MaxCLL and a maximum luminance average value MaxFALL based on a frame image to be displayed. Furthermore, when the maximum luminance value MaxCLL exceeds the maximum luminance average value MaxFALL, and if the ratio of the deviation between the two values based on the maximum luminance average value MaxFALL exceeds a preset deviation ratio threshold, the maximum luminance value MaxCLL is compressed based on the maximum luminance average value MaxFALL to achieve a filtering and smoothing effect.

[0102] Figure 3 A flowchart for confirming first target brightness information provided by an embodiment of the present invention is shown.

[0103] According to an embodiment of the present invention, Figure 3 As shown, the metadata and the preset histogram statistical logic are used to obtain the first target brightness information according to the image information, specifically:

[0104] S302, dividing the image information into at least three brightness intervals based on histogram statistics and the second brightness information;

[0105] S304, obtaining a partition brightness value according to the image information and the first channel information;

[0106] S306, comparing the brightness value of the partition with the brightness interval to obtain a first reference brightness of the first target brightness information;

[0107] S308, determining whether the partition brightness value exceeds the first brightness information;

[0108] S310: If yes, compress the partition brightness value according to the first brightness information;

[0109] S312 : Calculate the difference between the partition brightness value and the first reference brightness of the first target brightness information to obtain a first floating brightness of the first target brightness information.

[0110] It should be noted that the subarea brightness value is the brightness of the subarea corresponding to the first channel information in the image. In this embodiment, the process for determining the first target brightness is as follows: dividing the image into at least three brightness intervals based on the second brightness information; obtaining a subarea brightness value based on the first channel information; obtaining a first reference brightness based on the subarea brightness value and the brightness interval; adjusting the subarea brightness value based on the first brightness information; and obtaining a first floating brightness based on the first reference brightness and the subarea brightness value.

[0111] As an implementation method, first, at least three brightness intervals are divided based on the maximum brightness mean MaxFALL; wherein each brightness interval is used to set a reference brightness. Secondly, according to the channel number of the partition, the brightness value of the corresponding partition is obtained according to the image information. Thirdly, according to the brightness interval in which the partition brightness value is located, the first reference brightness of the first target brightness information is determined. Then, if the partition brightness value exceeds the maximum brightness value MaxCLL, the partition brightness value is compressed according to the maximum brightness value MaxCLL; otherwise, there is no need to adjust the partition brightness value. Finally, the difference between the partition brightness value and the first reference brightness is calculated to obtain the first floating brightness. wherein, the first reference brightness and the first floating brightness are used to combine into the first target brightness information.

[0112] According to an embodiment of the present invention, the target brightness deviation of adjacent subareas is detected based on the first target brightness information, and the second target brightness information is obtained based on a preset coupling suppression algorithm, specifically:

[0113] A first target brightness curve and a second target brightness curve are obtained based on the horizontal and vertical arrangement of the backlight module array;

[0114] Determining whether a target brightness deviation of adjacent subareas on the first target brightness curve or the second target brightness curve exceeds a preset first brightness deviation threshold;

[0115] If so, based on a preset gradient interpolation algorithm and according to the corresponding target brightness curve, a gradient adjustment value of the first target brightness information is calculated to obtain the second target brightness information.

[0116] It should be noted that the first target brightness curve is a curve composed of target backlight values in the horizontal direction parallel to the backlight module array arrangement; the second target brightness curve is a curve composed of target backlight values in the vertical direction parallel to the backlight module array arrangement. In this embodiment, a gradient filtering process is provided to suppress display halo. The process specifically comprises: obtaining a first target brightness curve and a second target brightness curve; if the target brightness deviation of adjacent partitions on the first target brightness curve or the second target brightness curve exceeds a preset first brightness deviation threshold, then calculating the second target brightness information based on a preset gradient interpolation algorithm.

[0117] As an implementation method, first, a first target brightness curve and a second target brightness curve are recorded sequentially based on the horizontal and vertical arrangement of the backlight module array. Then, the brightness deviation between the target brightness point and the adjacent target brightness point on the curve is calculated. If the brightness deviation exceeds a preset first brightness deviation threshold, a preset gradient interpolation algorithm is used to optimize the brightness transition curve and suppress haloing by inserting intermediate brightness gradients. The execution process of the gradient interpolation algorithm is as follows: based on the changing trend of the corresponding target brightness curve, a gradient adjustment value is calculated based on the first target brightness information, which is used to correct the first target brightness information to obtain the second target brightness information.

[0118] According to an embodiment of the present invention, the further embodiment includes:

[0119] When in calibration mode;

[0120] Based on a preset standard brightness picture, standard brightness information is obtained through an optical measuring device;

[0121] Calculating the difference between the second target brightness information and the standard brightness information to obtain a first compensation coefficient matrix;

[0122] When in run mode;

[0123] Obtaining a first compensation coefficient according to the first channel information and the first compensation coefficient matrix;

[0124] The first floating brightness of the first target brightness information is corrected according to the first compensation coefficient.

[0125] It should be noted that, in this embodiment, a factory calibration is provided to generate a compensation coefficient to improve the uniformity of the brightness of each partition. When in calibration mode, the display screen is set to a standard brightness screen, and the brightness data is collected by partitioning through an optical measuring device to obtain standard brightness information; the difference between the second target brightness information and the standard brightness information of each partition is calculated to obtain the first compensation coefficient matrix. When in operation mode, the first compensation coefficient matrix is searched according to the channel number of the backlight module to obtain the compensation coefficient of the corresponding partition; then the first floating brightness of the first target brightness information of the corresponding partition is corrected according to the compensation coefficient to compensate for production inconsistencies. The compensation coefficient is only used to adjust the floating brightness to achieve detailed adjustment, thereby improving the uniformity of the partition brightness.

[0126] According to an embodiment of the present invention, the further embodiment includes:

[0127] Obtaining first temperature information of a target partition;

[0128] Obtaining a first brightness attenuation coefficient based on a preset temperature-brightness attenuation curve;

[0129] The first floating brightness of the first target brightness information is corrected according to the first brightness attenuation coefficient.

[0130] It should be noted that this embodiment incorporates temperature compensation logic. A temperature sensor monitors the temperature of each Mini LED sub-area in real time, dynamically generating a first brightness attenuation coefficient based on the temperature-brightness attenuation curve. This first brightness attenuation coefficient then corrects the first floating brightness of the first target brightness information for the corresponding sub-area to compensate for the brightness drop caused by rising temperature. The compensation coefficient is used only to adjust the floating brightness, enabling detailed adjustments and improving the accuracy of sub-area brightness.

[0131] It is worth mentioning that it also includes:

[0132] Obtaining a brightness life coefficient according to the reference current information;

[0133] Sending the brightness life coefficient and working time to a preset aging neural network model for prediction to obtain a second brightness attenuation coefficient;

[0134] The first floating brightness of the first target brightness information is corrected according to the second brightness attenuation coefficient.

[0135] It should be noted that this embodiment incorporates aging compensation logic. By recording the baseline current during Mini LED operation and converting it into a brightness lifetime coefficient according to a preset lifetime formula, the brightness lifetime coefficient and the luminous duration are fed into a preset aging neural network model for prediction, yielding a second brightness decay coefficient. This second brightness decay coefficient is then used to correct the first floating brightness of the first target brightness information for the corresponding partition to compensate for brightness drop due to aging.

[0136] It is worth mentioning that it also includes:

[0137] The backlight refresh frequency is set to an integer multiple of the screen refresh frequency;

[0138] The backlight refresh frequency is set in the range of 2KHz to 4KHz.

[0139] It should be noted that in this embodiment, the backlight refresh frequency is set to an integer multiple of the image refresh frequency to reduce dynamic image smearing. In addition, the backlight frequency is set to 2KHz to 4KHz to reduce the backlight flicker problem.

[0140] Figure 4 A block diagram of a driving system for a high-contrast Mini LED backlight module of the present invention is shown.

[0141] like Figure 4As shown, the second aspect of the present invention discloses a driving system 4 for a high-contrast Mini LED backlight module, comprising a memory 41 and a processor 42. The memory includes a driving method program for the high-contrast Mini LED backlight module. When the driving method program for the high-contrast Mini LED backlight module is executed by the processor, the following steps are implemented:

[0142] Based on a preset backlight module array arrangement rule, obtaining first channel information of the partition;

[0143] Obtaining image information based on a preset backlight refresh frequency;

[0144] Obtaining first target brightness information according to the image information based on the metadata and a preset histogram statistical logic;

[0145] Detecting target brightness deviations of adjacent subareas based on the first target brightness information, and obtaining second target brightness information based on a preset coupling suppression algorithm;

[0146] obtaining reference current information and floating current information according to the second target brightness information;

[0147] Configuring a dimming constant current output of a backlight module of a corresponding partition according to the first channel information and the reference current information;

[0148] The dimming PWM duty cycle of the backlight module of the corresponding partition is configured according to the first channel information and the floating current information.

[0149] It should be noted that the first channel information is the channel number of the backlight module; the image information is the brightness distribution diagram of the image to be displayed; the first target brightness information is the initial value of the target backlight brightness; the second target brightness information is the calibration value of the target backlight brightness; the reference current information is the constant current component of the backlight module dimming current; and the floating current information is the dynamic current adjustment value based on PWM dimming. The metadata includes at least the maximum brightness value of the screen image (MaxCLL) and the average maximum brightness value of a group of screen images (MaxFALL).

[0150] In this embodiment, a backlight driving process of a high-contrast Mini LED backlight module is provided. Based on the arrangement rules of the Mini LED backlight module array, the channel number of each backlight module is obtained; wherein, in the application of the present invention, the backlight module is usually divided into 512 to 2048 independently controllable rectangular partitions, each partition contains 8×8 to 32×32 Mini LEDs, and an active matrix driving circuit is used to configure an independent driving channel for each partition. When driving the backlight, first, according to the backlight refresh, the brightness distribution diagram of the image to be displayed is determined. Secondly, metadata and histogram statistics are obtained through image recognition analysis to calculate the initial value of the target backlight brightness of the backlight module corresponding to each channel number, that is, the first target brightness information. Then, according to the deviation value of the target brightness of the adjacent partitions, the target brightness is corrected according to the preset gradient algorithm to obtain the correction of the target backlight brightness of the backlight module corresponding to each channel number, that is, the second target brightness information. Finally, based on the second target brightness information, the constant current component and floating component of the backlight current are determined. The backlight module's constant current output is adjusted based on the constant current component, while the dimming PWM duty cycle is adjusted based on the floating component. This improves dimming resolution, achieving fine dimming in low-brightness areas and stable output in high-brightness areas. In other words, the constant current component reduces the scale interval of the floating component, thereby improving dimming resolution. For example, for a brightness range of [0, 100], the constant current component is set to [0, 20, 40, 60, 80, 100], and the dimming PWM precision is 10-bit. If dimming is performed solely using the constant current component, the brightness resolution is 20; if dimming is performed solely using PWM, the brightness resolution is 100 / 1024 ≈ 0.1; and if dimming is performed in conjunction with the constant current component and dimming PWM, the brightness resolution is 20 / 1024 ≈ 0.02. This shows that combined dimming using the constant current and floating components can significantly improve dimming resolution.

[0151] According to an embodiment of the present invention, the metadata specifically includes:

[0152] Obtaining first brightness information based on the maximum brightness of the current frame image;

[0153] Obtaining second brightness information based on an average value of maximum brightness of a preset number of picture frame images;

[0154] determining whether the first brightness information is greater than the second brightness information;

[0155] If so, calculating the difference between the first brightness information and the second brightness information to obtain a first brightness deviation value;

[0156] Calculating a ratio of the first brightness deviation value to the second brightness information to obtain a first deviation ratio;

[0157] Determining whether the first deviation ratio exceeds a preset deviation ratio threshold;

[0158] If so, compress the first brightness information according to the second brightness information.

[0159] It should be noted that the first brightness information is the maximum brightness value of the screen image, recorded as MaxCLL, which is used to determine the brightness level that the brightest part of the screen can reach and is an important reference for the display device when displaying highlights. The second brightness information is the average of the maximum brightness of a group of screen images, recorded as MaxFALL, which is used to reflect the average peak brightness of the entire screen and helps the display device to reasonably adjust and optimize the overall brightness of the screen.

[0160] In this embodiment, the metadata confirmation process is as follows: first brightness information and second brightness information are obtained based on a frame image; if the first brightness information is greater than the second brightness information, a first deviation ratio is calculated; if the first deviation ratio exceeds a preset deviation ratio threshold, the first brightness information is compressed based on the second brightness information. If the first brightness information is not greater than the second brightness information, the first brightness information does not need to be adjusted.

[0161] As an embodiment, the present invention determines a maximum luminance value MaxCLL and a maximum luminance average value MaxFALL based on a frame image to be displayed. Furthermore, when the maximum luminance value MaxCLL exceeds the maximum luminance average value MaxFALL, and if the ratio of the deviation between the two values based on the maximum luminance average value MaxFALL exceeds a preset deviation ratio threshold, the maximum luminance value MaxCLL is compressed based on the maximum luminance average value MaxFALL to achieve a filtering and smoothing effect.

[0162] According to an embodiment of the present invention, the metadata and the preset histogram statistical logic are used to obtain the first target brightness information according to the image information, specifically:

[0163] Based on histogram statistics of the image information, dividing the image into at least three brightness intervals according to the second brightness information;

[0164] Obtaining a partition brightness value according to the image information and the first channel information;

[0165] According to the partition brightness value, the brightness interval is compared to obtain a first reference brightness of the first target brightness information;

[0166] Determining whether the partition brightness value exceeds the first brightness information;

[0167] If yes, compressing the partition brightness value according to the first brightness information;

[0168] A difference between the partition brightness value and a first reference brightness of the first target brightness information is calculated to obtain a first floating brightness of the first target brightness information.

[0169] It should be noted that the subarea brightness value is the brightness of the subarea corresponding to the first channel information in the image. In this embodiment, the process for determining the first target brightness is as follows: dividing the image into at least three brightness intervals based on the second brightness information; obtaining a subarea brightness value based on the first channel information; obtaining a first reference brightness based on the subarea brightness value and the brightness interval; adjusting the subarea brightness value based on the first brightness information; and obtaining a first floating brightness based on the first reference brightness and the subarea brightness value.

[0170] As an implementation method, first, at least three brightness intervals are divided based on the maximum brightness mean MaxFALL; wherein each brightness interval is used to set a reference brightness. Secondly, according to the channel number of the partition, the brightness value of the corresponding partition is obtained according to the image information. Thirdly, according to the brightness interval in which the partition brightness value is located, the first reference brightness of the first target brightness information is determined. Then, if the partition brightness value exceeds the maximum brightness value MaxCLL, the partition brightness value is compressed according to the maximum brightness value MaxCLL; otherwise, there is no need to adjust the partition brightness value. Finally, the difference between the partition brightness value and the first reference brightness is calculated to obtain the first floating brightness. wherein, the first reference brightness and the first floating brightness are used to combine into the first target brightness information.

[0171] According to an embodiment of the present invention, the target brightness deviation of adjacent subareas is detected based on the first target brightness information, and the second target brightness information is obtained based on a preset coupling suppression algorithm, specifically:

[0172] A first target brightness curve and a second target brightness curve are obtained based on the horizontal and vertical arrangement of the backlight module array;

[0173] Determining whether a target brightness deviation of adjacent subareas on the first target brightness curve or the second target brightness curve exceeds a preset first brightness deviation threshold;

[0174] If so, based on a preset gradient interpolation algorithm and according to the corresponding target brightness curve, a gradient adjustment value of the first target brightness information is calculated to obtain the second target brightness information.

[0175] It should be noted that the first target brightness curve is a curve composed of target backlight values in the horizontal direction parallel to the backlight module array arrangement; the second target brightness curve is a curve composed of target backlight values in the vertical direction parallel to the backlight module array arrangement. In this embodiment, a gradient filtering process is provided to suppress display halo. The process specifically comprises: obtaining a first target brightness curve and a second target brightness curve; if the target brightness deviation of adjacent partitions on the first target brightness curve or the second target brightness curve exceeds a preset first brightness deviation threshold, then calculating the second target brightness information based on a preset gradient interpolation algorithm.

[0176] As an implementation method, first, a first target brightness curve and a second target brightness curve are recorded sequentially based on the horizontal and vertical arrangement of the backlight module array. Then, the brightness deviation between the target brightness point and the adjacent target brightness point on the curve is calculated. If the brightness deviation exceeds a preset first brightness deviation threshold, a preset gradient interpolation algorithm is used to optimize the brightness transition curve and suppress haloing by inserting intermediate brightness gradients. The execution process of the gradient interpolation algorithm is as follows: based on the changing trend of the corresponding target brightness curve, a gradient adjustment value is calculated based on the first target brightness information, which is used to correct the first target brightness information to obtain the second target brightness information.

[0177] According to an embodiment of the present invention, the further embodiment includes:

[0178] When in calibration mode;

[0179] Based on a preset standard brightness picture, standard brightness information is obtained through an optical measuring device;

[0180] Calculating the difference between the second target brightness information and the standard brightness information to obtain a first compensation coefficient matrix;

[0181] When in run mode;

[0182] Obtaining a first compensation coefficient according to the first channel information and the first compensation coefficient matrix;

[0183] The first floating brightness of the first target brightness information is corrected according to the first compensation coefficient.

[0184] It should be noted that, in this embodiment, a factory calibration is provided to generate a compensation coefficient to improve the uniformity of the brightness of each partition. When in calibration mode, the display screen is set to a standard brightness screen, and the brightness data is collected by partitioning through an optical measuring device to obtain standard brightness information; the difference between the second target brightness information and the standard brightness information of each partition is calculated to obtain the first compensation coefficient matrix. When in operation mode, the first compensation coefficient matrix is searched according to the channel number of the backlight module to obtain the compensation coefficient of the corresponding partition; then the first floating brightness of the first target brightness information of the corresponding partition is corrected according to the compensation coefficient to compensate for production inconsistencies. The compensation coefficient is only used to adjust the floating brightness to achieve detailed adjustment, thereby improving the uniformity of the partition brightness.

[0185] According to an embodiment of the present invention, the further embodiment includes:

[0186] Obtaining first temperature information of a target partition;

[0187] Obtaining a first brightness attenuation coefficient based on a preset temperature-brightness attenuation curve;

[0188] The first floating brightness of the first target brightness information is corrected according to the first brightness attenuation coefficient.

[0189] It should be noted that this embodiment incorporates temperature compensation logic. A temperature sensor monitors the temperature of each Mini LED sub-area in real time, dynamically generating a first brightness attenuation coefficient based on the temperature-brightness attenuation curve. This first brightness attenuation coefficient then corrects the first floating brightness of the first target brightness information for the corresponding sub-area to compensate for the brightness drop caused by rising temperature. The compensation coefficient is used only to adjust the floating brightness, enabling detailed adjustments and improving the accuracy of sub-area brightness.

[0190] It is worth mentioning that it also includes:

[0191] Obtaining a brightness life coefficient according to the reference current information;

[0192] Sending the brightness life coefficient and working time to a preset aging neural network model for prediction to obtain a second brightness attenuation coefficient;

[0193] The first floating brightness of the first target brightness information is corrected according to the second brightness attenuation coefficient.

[0194] It should be noted that this embodiment incorporates aging compensation logic. By recording the baseline current during Mini LED operation and converting it into a brightness lifetime coefficient according to a preset lifetime formula, the brightness lifetime coefficient and the luminous duration are fed into a preset aging neural network model for prediction, yielding a second brightness decay coefficient. This second brightness decay coefficient is then used to correct the first floating brightness of the first target brightness information for the corresponding partition to compensate for brightness drop due to aging.

[0195] It is worth mentioning that it also includes:

[0196] The backlight refresh frequency is set to an integer multiple of the screen refresh frequency;

[0197] The backlight refresh frequency is set in the range of 2KHz to 4KHz.

[0198] It should be noted that in this embodiment, the backlight refresh frequency is set to an integer multiple of the image refresh frequency to reduce dynamic image smearing. In addition, the backlight frequency is set to 2KHz to 4KHz to reduce the backlight flicker problem.

[0199] A third aspect of the present invention provides a computer-readable storage medium, which includes a driving method program for a high-contrast Mini LED backlight module. When the driving method program for the high-contrast Mini LED backlight module is executed by a processor, the steps of the driving method for the high-contrast Mini LED backlight module as described in any one of the above items are implemented.

[0200] In summary, the present invention provides a driving method, system, and storage medium for a high-contrast Mini LED backlight module. First, independent partitions are divided based on the array arrangement rules of the backlight module and channel information is obtained. The brightness distribution of the input image is analyzed in combination with a preset backlight refresh frequency. The first target brightness information for each partition is determined through histogram statistics and metadata analysis. Subsequently, the brightness deviation of adjacent partitions is detected, and a gradient interpolation algorithm is used to smooth areas exceeding a preset threshold to generate second target brightness information to suppress the halo effect. At the same time, constant current output and PWM duty cycle are configured in combination with a reference current and a floating current, respectively, to achieve fine dimming in low-brightness areas and stable output in high-brightness areas. Furthermore, a compensation coefficient matrix is generated by collecting standard brightness data in a factory calibration mode. The partition brightness is dynamically corrected during operation. A temperature sensor is used to monitor and compensate for brightness attenuation caused by temperature rise in real time to ensure brightness uniformity.

[0201] If the functions are implemented as software modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or the portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0202] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A driving method for a high-contrast Mini LED backlight module, characterized in that: The method comprises: Based on a preset backlight module array arrangement rule, obtaining first channel information of the partition; Obtaining image information based on a preset backlight refresh frequency; Obtaining first target brightness information according to the image information based on the metadata and a preset histogram statistical logic; Detecting target brightness deviations of adjacent subareas based on the first target brightness information, and obtaining second target brightness information based on a preset coupling suppression algorithm; obtaining reference current information and floating current information according to the second target brightness information; Configuring a dimming constant current output of a backlight module of a corresponding partition according to the first channel information and the reference current information; According to the first channel information and the floating current information, the dimming PWM duty cycle of the backlight module of the corresponding partition is configured; The step of obtaining first target brightness information based on the image information based on the metadata and the preset histogram statistical logic specifically includes: Obtaining first brightness information based on the maximum brightness of the current frame image; Obtaining second brightness information based on an average value of maximum brightness of a preset number of picture frame images; determining whether the first brightness information is greater than the second brightness information; If so, calculating the difference between the first brightness information and the second brightness information to obtain a first brightness deviation value; Calculating a ratio of the first brightness deviation value to the second brightness information to obtain a first deviation ratio; Determining whether the first deviation ratio exceeds a preset deviation ratio threshold; If so, compressing the first brightness information according to the second brightness information; The first brightness information is the maximum brightness value of the screen image, which is used to determine the brightness level that the brightest part of the screen can reach; The metadata confirmation process provided is specifically as follows: first brightness information and second brightness information are obtained based on the frame image; if the first brightness information is greater than the second brightness information, a first deviation ratio needs to be calculated; if the first deviation ratio exceeds a preset deviation ratio threshold, the first brightness information is compressed according to the second brightness information; if the first brightness information is not greater than the second brightness information, there is no need to adjust the first brightness information.

2. The driving method of a high-contrast Mini LED backlight module according to claim 1, characterized in that: The metadata and the preset histogram statistical logic are used to obtain the first target brightness information according to the image information, specifically: Based on histogram statistics of the image information, dividing the image into at least three brightness intervals according to the second brightness information; Obtaining a partition brightness value according to the image information and the first channel information; According to the partition brightness value, the brightness interval is compared to obtain a first reference brightness of the first target brightness information; Determining whether the partition brightness value exceeds the first brightness information; If yes, compressing the partition brightness value according to the first brightness information; A difference between the partition brightness value and a first reference brightness of the first target brightness information is calculated to obtain a first floating brightness of the first target brightness information.

3. The driving method of a high-contrast Mini LED backlight module according to claim 1, characterized in that: The method of detecting target brightness deviations of adjacent subareas based on the first target brightness information and obtaining second target brightness information based on a preset coupling suppression algorithm is as follows: A first target brightness curve and a second target brightness curve are obtained based on the horizontal and vertical arrangement of the backlight module array; Determining whether a target brightness deviation of adjacent subareas on the first target brightness curve or the second target brightness curve exceeds a preset first brightness deviation threshold; If so, based on a preset gradient interpolation algorithm and according to the corresponding target brightness curve, a gradient adjustment value of the first target brightness information is calculated to obtain the second target brightness information.

4. The driving method of a high-contrast Mini LED backlight module according to claim 1, characterized in that: Also includes: When in calibration mode; Based on a preset standard brightness picture, standard brightness information is obtained through an optical measuring device; Calculating the difference between the second target brightness information and the standard brightness information to obtain a first compensation coefficient matrix; When in run mode; Obtaining a first compensation coefficient according to the first channel information and the first compensation coefficient matrix; The first floating brightness of the first target brightness information is corrected according to the first compensation coefficient.

5. The driving method of a high-contrast Mini LED backlight module according to claim 1, characterized in that: Also includes: Obtaining first temperature information of a target partition; Obtaining a first brightness attenuation coefficient based on a preset temperature-brightness attenuation curve; The first floating brightness of the first target brightness information is corrected according to the first brightness attenuation coefficient.

6. A driving system for a high-contrast Mini LED backlight module, characterized in that: The system includes a memory and a processor. The memory includes a driving method program for a high-contrast Mini LED backlight module. When the driving method program for the high-contrast Mini LED backlight module is executed by the processor, the following steps are implemented: Based on a preset backlight module array arrangement rule, obtaining first channel information of the partition; Obtaining image information based on a preset backlight refresh frequency; Obtaining first target brightness information according to the image information based on the metadata and a preset histogram statistical logic; Detecting target brightness deviations of adjacent subareas based on the first target brightness information, and obtaining second target brightness information based on a preset coupling suppression algorithm; obtaining reference current information and floating current information according to the second target brightness information; Configuring a dimming constant current output of a backlight module of a corresponding partition according to the first channel information and the reference current information; According to the first channel information and the floating current information, the dimming PWM duty cycle of the backlight module of the corresponding partition is configured; The step of obtaining first target brightness information based on the image information based on the metadata and the preset histogram statistical logic specifically includes: Obtaining first brightness information based on the maximum brightness of the current frame image; Obtaining second brightness information based on an average value of maximum brightness of a preset number of picture frame images; determining whether the first brightness information is greater than the second brightness information; If so, calculating the difference between the first brightness information and the second brightness information to obtain a first brightness deviation value; Calculating a ratio of the first brightness deviation value to the second brightness information to obtain a first deviation ratio; Determining whether the first deviation ratio exceeds a preset deviation ratio threshold; If so, compressing the first brightness information according to the second brightness information; The first brightness information is the maximum brightness value of the screen image, which is used to determine the brightness level that the brightest part of the screen can reach; The metadata confirmation process provided is specifically as follows: first brightness information and second brightness information are obtained based on the frame image; if the first brightness information is greater than the second brightness information, a first deviation ratio needs to be calculated; if the first deviation ratio exceeds a preset deviation ratio threshold, the first brightness information is compressed according to the second brightness information; if the first brightness information is not greater than the second brightness information, there is no need to adjust the first brightness information.

7. The driving system of a high-contrast Mini LED backlight module according to claim 6, characterized in that: The metadata and the preset histogram statistical logic are used to obtain the first target brightness information according to the image information, specifically: Based on histogram statistics of the image information, dividing the image into at least three brightness intervals according to the second brightness information; Obtaining a partition brightness value according to the image information and the first channel information; According to the partition brightness value, the brightness interval is compared to obtain a first reference brightness of the first target brightness information; Determining whether the partition brightness value exceeds the first brightness information; If yes, compressing the partition brightness value according to the first brightness information; A difference between the partition brightness value and a first reference brightness of the first target brightness information is calculated to obtain a first floating brightness of the first target brightness information.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: The computer-readable storage medium includes a driving method program for a high-contrast Mini LED backlight module. When the driving method program for the high-contrast Mini LED backlight module is executed by a processor, the steps of the driving method for the high-contrast Mini LED backlight module according to any one of claims 1 to 5 are implemented.

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