Driving method and system of high-contrast Mini LED backlight module and storage medium

Abstract

The invention provides a driving method and system for a high-contrast Mini LED backlight module and a storage medium, and the method comprises the steps: dividing independent partitions based on an array arrangement rule of the backlight module, obtaining channel information, and analyzing the brightness distribution of an input image in combination with a preset backlight refresh frequency. Determining first target brightness information of each partition through histogram statistics and metadata analysis; and then, brightness deviation of adjacent partitions is detected, smooth adjustment is carried out on areas exceeding a preset threshold value by using a gradient interpolation algorithm, second target brightness information is generated to suppress a halo effect, and constant current output and a PWM duty ratio are configured in combination with the reference current and the floating current. Fine dimming in a low-brightness area and stable output in a high-brightness area are realized. In addition, standard brightness data is collected in a factory calibration mode to generate a compensation coefficient matrix, the partition brightness is dynamically corrected during operation, brightness attenuation caused by temperature rise is monitored and compensated in real time in combination with a temperature sensor, and brightness uniformity is ensured.

Description

Technical Field

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

[0002] At present, although Mini LED backlight technology has improved display contrast and brightness compared with traditional LEDs, its performance is still limited by the existing driving scheme and has the following key defects: 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 adapting HDR content for the coexistence of high-brightness details and pure black scenes.

[0003] Secondly, since the existing driving technology transitions to rely on single PWM dimming or constant current dimming, it is easy to cause low-frequency flicker or color temperature deviation at low brightness. At high brightness, the current overload aggravates the temperature rise of the Mini LED, accelerating light decay and color temperature drift.

[0004] Third, existing solutions lack dynamic temperature compensation and correction mechanisms. Mini LED arrays are prone to uneven brightness due to manufacturing tolerances and heat, resulting in visible spots or dark areas on the display panel.

[0005] Therefore, there is an urgent need for a backlight driving technology applied to Mini LED to improve display performance. Summary of the invention

[0006] 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 rule 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, and the first target brightness information of each partition is determined by histogram statistics and metadata analysis; then, the brightness deviation of adjacent partitions is detected, and the gradient interpolation algorithm is used to smoothly adjust the area exceeding the preset threshold, and the second target brightness information is generated to suppress the halo effect. At the same time, the constant current output and PWM duty cycle are configured respectively in combination with the reference current and the floating current to achieve fine dimming in the low-brightness area and stable output in the high-brightness area. In addition, the standard brightness data is collected through the factory calibration mode to generate a compensation coefficient matrix, and the partition brightness is dynamically corrected during operation. The temperature sensor is combined to monitor and compensate for the brightness attenuation caused by temperature rise in real time to ensure brightness uniformity.

[0007] A first aspect of the present invention provides a driving method for a high-contrast Mini LED backlight module, the method comprising: Based on a preset backlight module array arrangement rule, obtaining first channel information of the partition; Based on the preset backlight refresh frequency, image information is obtained; Based on the metadata and the preset histogram statistical logic, obtaining first target brightness information according to the image information; According to the first target brightness information, the target brightness deviation of the adjacent partitions is detected, and based on a preset coupling suppression algorithm, the second target brightness information is obtained; According to the second target brightness information, obtaining reference current information and floating current information; According to the first channel information and the reference current information, configuring the dimming constant current output of the backlight module of the corresponding partition; 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.

[0008] In this solution, the metadata specifically includes: Based on the maximum brightness of the current frame image, obtaining first brightness information; Obtaining second brightness information based on an average value of the highest brightness of a preset number of picture frame images; Determining whether the first brightness information is greater than the second brightness information; If yes, then 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, compress the first brightness information according to the second brightness information.

[0009] In this solution, the metadata and the preset histogram statistical logic are used to obtain the brightness information of the first target according to the image information, specifically: Based on histogram statistics of the image information, dividing the image information 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; Determine whether the partition brightness value exceeds the first brightness information; If yes, compressing the partition brightness value according to the first brightness information; The difference between the partition brightness value and the first reference brightness of the first target brightness information is calculated to obtain the first floating brightness of the first target brightness information.

[0010] In this solution, according to the first target brightness information, the target brightness deviation of the adjacent partitions is detected, and the second target brightness information is obtained based on a preset coupling suppression algorithm, specifically: A first target brightness curve and a second target brightness curve are obtained based on the horizontal and vertical directions of the backlight module array arrangement respectively; Determine 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.

[0011] This plan 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.

[0012] This plan also includes: Acquire first temperature information of the target partition; Based on a preset temperature-brightness attenuation curve, obtaining a first brightness attenuation coefficient; The first floating brightness of the first target brightness information is corrected according to the first brightness attenuation coefficient.

[0013] 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 a high-contrast Mini LED backlight module, wherein the driving method program for the high-contrast Mini LED backlight module implements the following steps when executed by the processor: Based on a preset backlight module array arrangement rule, obtaining first channel information of the partition; Based on the preset backlight refresh frequency, image information is obtained; Based on the metadata and the preset histogram statistical logic, obtaining first target brightness information according to the image information; According to the first target brightness information, the target brightness deviation of the adjacent partitions is detected, and based on a preset coupling suppression algorithm, the second target brightness information is obtained; According to the second target brightness information, obtaining reference current information and floating current information; According to the first channel information and the reference current information, configuring the dimming constant current output of the backlight module of the corresponding partition; 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.

[0014] In this solution, first brightness information is obtained based on the maximum brightness of the current frame image; Obtaining second brightness information based on an average value of the highest brightness of a preset number of picture frame images; Determining whether the first brightness information is greater than the second brightness information; If yes, then 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, compress the first brightness information according to the second brightness information.

[0015] In this solution, the metadata and the preset histogram statistical logic are used to obtain the brightness information of the first target according to the image information, specifically: Based on histogram statistics of the image information, dividing the image information 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; Determine whether the partition brightness value exceeds the first brightness information; If yes, compressing the partition brightness value according to the first brightness information; The difference between the partition brightness value and the first reference brightness of the first target brightness information is calculated to obtain the first floating brightness of the first target brightness information.

[0016] 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.

[0017] The present invention provides a driving method, system and storage medium for a high-contrast Mini LED backlight module. First, based on the array arrangement rule 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, and the first target brightness information of each partition is determined by histogram statistics and metadata analysis; then, the brightness deviation of adjacent partitions is detected, and the gradient interpolation algorithm is used to smoothly adjust the area exceeding the preset threshold, and the second target brightness information is generated to suppress the halo effect. At the same time, the constant current output and PWM duty cycle are configured respectively in combination with the reference current and the floating current to achieve fine dimming in the low-brightness area and stable output in the high-brightness area. In addition, the standard brightness data is collected through the factory calibration mode to generate a compensation coefficient matrix, and the partition brightness is dynamically corrected during operation. The temperature sensor is combined to monitor and compensate for the brightness attenuation caused by temperature rise in real time to ensure brightness uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope.

[0019] Figure 1 A flow chart showing a method for driving a high-contrast Mini LED backlight module according to the present invention is shown; Figure 2 A flowchart of metadata confirmation provided by an embodiment of the present invention is shown; Figure 3 A flowchart for confirming the brightness information of a first target provided by an embodiment of the present invention is shown; 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

[0020] 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meanings 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 the embodiments of the present invention are explicitly defined in this way.

[0022] The words "first", "second" and similar words 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" and similar words do not indicate a quantity limitation, but indicate the existence of at least one. Similarly, words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words 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 are not necessarily carried out in order. On the contrary, various steps can be processed in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or a step or several steps can be removed from these processes.

[0023] 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.

[0024] Figure 1 A flow chart of a driving method of a high-contrast Mini LED backlight module of the present invention is shown.

[0025] like Figure 1 As shown, the first aspect of the present invention discloses a driving method of a high-contrast Mini LED backlight module, the method comprising: S102, obtaining first channel information of the partition based on a preset backlight module array arrangement rule; S104, obtaining image information based on a preset backlight refresh frequency; S106, obtaining first target brightness information according to the image information based on the metadata and a preset histogram statistical logic; S108, detecting target brightness deviations of adjacent subareas according to the first target brightness information, and obtaining second target brightness information based on a preset coupling suppression algorithm; S110, obtaining reference current information and floating current information according to the second target brightness information; 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; S114: configuring a dimming PWM duty cycle of a backlight module of a corresponding partition according to the first channel information and the floating current information.

[0026] 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 dimming current of the backlight module; the floating current information is the dynamic current adjustment value based on PWM dimming. The metadata at least includes the maximum brightness value (MaxCLL) of the screen image and the average value (MaxFALL) of the maximum brightness of a group of screen images.

[0027] In the present embodiment, a backlight driving process of a high-contrast Mini LED backlight module is provided. Based on the arrangement rule 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, the constant current component and floating component of the backlight current are determined according to the second target brightness information, the dimming constant current output of the backlight module is adjusted based on the constant current component, and the dimming PWM duty cycle of the backlight module is adjusted based on the floating component, thereby improving the dimming resolution and achieving fine dimming in the low brightness area and stable output in the high brightness area. In other words, the constant current component is used to reduce the division interval of the floating component, thereby improving the dimming resolution. For example, for the range of brightness interval [0,100], the setting amount of the constant current component is [0,20,40,60,80,100], and the precision of the dimming PWM is 10-bit. If dimming is performed only by the constant current component, its brightness resolution is 20; if dimming is performed only by PWM, its brightness resolution is 100 / 1024≈0.1; if the constant current component and dimming PWM are combined for dimming, its brightness resolution is 20 / 1024≈0.02. It can be seen that the combined dimming based on the constant current component and the floating component can significantly improve the dimming resolution.

[0028] Figure 2 A flowchart of metadata confirmation provided by an embodiment of the present invention is shown.

[0029] According to an embodiment of the present invention, Figure 2 As shown, the metadata specifically includes: S202, obtaining first brightness information based on the maximum brightness of the current frame image; S204, obtaining second brightness information based on an average value of the highest brightness of a preset number of picture frame images; S206, determining whether the first brightness information is greater than the second brightness information; S208, if yes, calculating the difference between the first brightness information and the second brightness information to obtain a first brightness deviation value; S210, calculating a ratio of the first brightness deviation value to the second brightness information to obtain a first deviation ratio; S212, determining whether the first deviation ratio exceeds a preset deviation ratio threshold; S214: If yes, compress the first brightness information according to the second brightness information.

[0030] 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 the highlight part. The second brightness information is the average value of the maximum brightness of a group of screen images, recorded as MaxFALL, which is used to reflect the average peak value of the overall brightness of the screen, which helps the display device to reasonably adjust and optimize the overall brightness of the screen.

[0031] In this embodiment, the metadata confirmation process provided is specifically as follows: first brightness information and second brightness information are obtained according to 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, the first brightness information does not need to be adjusted.

[0032] As an implementation mode, the present invention determines the maximum brightness value MaxCLL and the maximum brightness mean value MaxFALL according to the frame image to be displayed. Furthermore, when the maximum brightness value MaxCLL exceeds the maximum brightness mean value MaxFALL, if the ratio of the deviation values ​​of the two based on the maximum brightness mean value MaxFALL exceeds a preset deviation ratio threshold, the maximum brightness value MaxCLL needs to be compressed according to the maximum brightness mean value MaxFALL to achieve a filtering and smoothing effect.

[0033] Figure 3 A flow chart for confirming the first target brightness information provided by an embodiment of the present invention is shown.

[0034] 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: S302, based on histogram statistics of the image information, dividing the image information into at least three brightness intervals according to the second brightness information; S304, obtaining a partition brightness value according to the image information and the first channel information; S306, comparing the brightness range according to the partition brightness value to obtain a first reference brightness of the first target brightness information; S308, determining whether the partition brightness value exceeds the first brightness information; S310, if yes, compressing the partition brightness value according to the first brightness information; 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.

[0035] It should be noted that the partition brightness value is the brightness of the partition corresponding to the first channel information in the image. In this embodiment, the process for determining the first target brightness is specifically as follows: according to the second brightness information, at least three brightness intervals are divided; according to the first channel information, a partition brightness value is obtained; according to the partition brightness value and the brightness interval, a first reference brightness is obtained; according to the first brightness information, the partition brightness value is adjusted; according to the first reference brightness and the partition brightness value, a first floating brightness is obtained.

[0036] 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. Among them, the first reference brightness and the first floating brightness are used to combine into the first target brightness information.

[0037] According to an embodiment of the present invention, the target brightness deviation of adjacent partitions is detected according to the first target brightness information, and the second target brightness information is obtained based on a preset coupling suppression algorithm, specifically: A first target brightness curve and a second target brightness curve are obtained based on the horizontal and vertical directions of the backlight module array arrangement respectively; Determine 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.

[0038] 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 arrangement of the backlight module array; the second target brightness curve is a curve composed of target backlight values ​​in the vertical direction parallel to the arrangement of the backlight module array. In this embodiment, a gradient filtering process is provided to suppress display halo. The process is specifically as follows: 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 based on a preset gradient interpolation algorithm, the second target brightness information is calculated.

[0039] As an implementation method, first, based on the horizontal and vertical arrangement of the backlight module array, the first target brightness curve and the second target brightness curve are recorded in sequence. Then, the brightness deviation between the target brightness point on the curve and the adjacent target brightness point is calculated. If the brightness deviation exceeds the preset first brightness deviation threshold, it is necessary to adopt a preset gradient interpolation algorithm to optimize the brightness transition curve and suppress halo by inserting an intermediate brightness gradient. Among them, the execution process of the gradient interpolation algorithm is: according to the change trend of the corresponding target brightness curve, the gradient adjustment value is calculated according to the first target brightness information to correct the first target brightness information and obtain the second target brightness information.

[0040] According to an embodiment of the present invention, it 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.

[0041] It should be noted that, in the present 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 partition 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.

[0042] According to an embodiment of the present invention, it also includes: Acquire first temperature information of the target partition; Based on a preset temperature-brightness attenuation curve, obtaining a first brightness attenuation coefficient; The first floating brightness of the first target brightness information is corrected according to the first brightness attenuation coefficient.

[0043] It should be noted that in this embodiment, a temperature compensation logic is provided. The temperature value of the Mini LED of each partition is detected in real time by a temperature sensor, and a first brightness attenuation coefficient is dynamically generated according to the temperature-brightness attenuation curve; then, the first floating brightness of the first target brightness information of the corresponding partition is corrected according to the first brightness attenuation coefficient to compensate for the problem of brightness reduction caused by temperature increase. The compensation coefficient is only used to adjust the floating brightness to achieve detailed adjustment, thereby improving the accuracy of the partition brightness.

[0044] It is worth mentioning that it also includes: According to the reference current information, a brightness life coefficient is obtained; Sending the brightness life coefficient and the working time to a preset aging neural network model for prediction to obtain a second brightness attenuation coefficient; The first floating brightness of the first target brightness information is corrected according to the second brightness attenuation coefficient.

[0045] It should be noted that in this embodiment, an aging compensation logic is provided. By recording the reference current during the operation of the Mini LED, the brightness life coefficient is converted according to the preset life formula. The brightness life coefficient and the luminous time are sent to the preset aging neural network model for prediction to obtain a second brightness attenuation coefficient; then, the first floating brightness of the first target brightness information of the corresponding partition is corrected according to the second brightness attenuation coefficient to compensate for the brightness drop caused by aging.

[0046] It is worth mentioning that it also includes: The backlight refresh frequency is set to an integer multiple of the screen refresh frequency; The backlight refresh frequency is set in the range of 2KHz to 4KHz.

[0047] It should be noted that in this embodiment, the backlight refresh frequency is set to an integer multiple of the picture refresh frequency to reduce dynamic picture smearing. In addition, the backlight frequency is set at 2KHz to 4KHz to reduce the backlight flicker problem.

[0048] Figure 4 A block diagram of a driving system for a high-contrast Mini LED backlight module of the present invention is shown.

[0049] like Figure 4 As shown, the second aspect of the present invention discloses a driving system 4 of a high-contrast Mini LED backlight module, including a memory 41 and a processor 42, wherein the memory includes a driving method program of the high-contrast Mini LED backlight module, and when the driving method program of 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; Based on the preset backlight refresh frequency, image information is obtained; Based on the metadata and the preset histogram statistical logic, obtaining first target brightness information according to the image information; According to the first target brightness information, the target brightness deviation of the adjacent partitions is detected, and based on a preset coupling suppression algorithm, the second target brightness information is obtained; According to the second target brightness information, obtaining reference current information and floating current information; According to the first channel information and the reference current information, configuring the dimming constant current output of the backlight module of the corresponding partition; 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.

[0050] 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 dimming current of the backlight module; the floating current information is the dynamic current adjustment value based on PWM dimming. The metadata at least includes the maximum brightness value (MaxCLL) of the screen image and the average value (MaxFALL) of the maximum brightness of a group of screen images.

[0051] In the present embodiment, a backlight driving process of a high-contrast Mini LED backlight module is provided. Based on the arrangement rule 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, the constant current component and floating component of the backlight current are determined according to the second target brightness information, the dimming constant current output of the backlight module is adjusted based on the constant current component, and the dimming PWM duty cycle of the backlight module is adjusted based on the floating component, thereby improving the dimming resolution and achieving fine dimming in the low brightness area and stable output in the high brightness area. In other words, the constant current component is used to reduce the division interval of the floating component, thereby improving the dimming resolution. For example, for the range of brightness interval [0,100], the setting amount of the constant current component is [0,20,40,60,80,100], and the precision of the dimming PWM is 10-bit. If dimming is performed only by the constant current component, its brightness resolution is 20; if dimming is performed only by PWM, its brightness resolution is 100 / 1024≈0.1; if the constant current component and dimming PWM are combined for dimming, its brightness resolution is 20 / 1024≈0.02. It can be seen that the combined dimming based on the constant current component and the floating component can significantly improve the dimming resolution.

[0052] According to an embodiment of the present invention, the metadata specifically includes: Based on the maximum brightness of the current frame image, obtaining first brightness information; Obtaining second brightness information based on an average value of the highest brightness of a preset number of picture frame images; Determining whether the first brightness information is greater than the second brightness information; If yes, then 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, compress the first brightness information according to the second brightness information.

[0053] 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 the highlight part. The second brightness information is the average value of the maximum brightness of a group of screen images, recorded as MaxFALL, which is used to reflect the average peak value of the overall brightness of the screen, which helps the display device to reasonably adjust and optimize the overall brightness of the screen.

[0054] In this embodiment, the metadata confirmation process provided is specifically as follows: first brightness information and second brightness information are obtained according to 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, the first brightness information does not need to be adjusted.

[0055] As an implementation mode, the present invention determines the maximum brightness value MaxCLL and the maximum brightness mean value MaxFALL according to the frame image to be displayed. Furthermore, when the maximum brightness value MaxCLL exceeds the maximum brightness mean value MaxFALL, if the ratio of the deviation values ​​of the two based on the maximum brightness mean value MaxFALL exceeds a preset deviation ratio threshold, the maximum brightness value MaxCLL needs to be compressed according to the maximum brightness mean value MaxFALL to achieve a filtering and smoothing effect.

[0056] 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: Based on histogram statistics of the image information, dividing the image information 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; Determine whether the partition brightness value exceeds the first brightness information; If yes, compressing the partition brightness value according to the first brightness information; The difference between the partition brightness value and the first reference brightness of the first target brightness information is calculated to obtain the first floating brightness of the first target brightness information.

[0057] It should be noted that the partition brightness value is the brightness of the partition corresponding to the first channel information in the image. In this embodiment, the process for determining the first target brightness is specifically as follows: according to the second brightness information, at least three brightness intervals are divided; according to the first channel information, a partition brightness value is obtained; according to the partition brightness value and the brightness interval, a first reference brightness is obtained; according to the first brightness information, the partition brightness value is adjusted; according to the first reference brightness and the partition brightness value, a first floating brightness is obtained.

[0058] 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. Among them, the first reference brightness and the first floating brightness are used to combine into the first target brightness information.

[0059] According to an embodiment of the present invention, the target brightness deviation of adjacent partitions is detected according to the first target brightness information, and the second target brightness information is obtained based on a preset coupling suppression algorithm, specifically: A first target brightness curve and a second target brightness curve are obtained based on the horizontal and vertical directions of the backlight module array arrangement respectively; Determine 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.

[0060] 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 arrangement of the backlight module array; the second target brightness curve is a curve composed of target backlight values ​​in the vertical direction parallel to the arrangement of the backlight module array. In this embodiment, a gradient filtering process is provided to suppress display halo. The process is specifically as follows: 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 based on a preset gradient interpolation algorithm, the second target brightness information is calculated.

[0061] As an implementation method, first, based on the horizontal and vertical arrangement of the backlight module array, the first target brightness curve and the second target brightness curve are recorded in sequence. Then, the brightness deviation between the target brightness point on the curve and the adjacent target brightness point is calculated. If the brightness deviation exceeds the preset first brightness deviation threshold, it is necessary to adopt a preset gradient interpolation algorithm to optimize the brightness transition curve and suppress halo by inserting an intermediate brightness gradient. Among them, the execution process of the gradient interpolation algorithm is: according to the change trend of the corresponding target brightness curve, the gradient adjustment value is calculated according to the first target brightness information to correct the first target brightness information and obtain the second target brightness information.

[0062] According to an embodiment of the present invention, it 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.

[0063] It should be noted that, in the present 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 partition 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.

[0064] According to an embodiment of the present invention, it also includes: Acquire first temperature information of the target partition; Based on a preset temperature-brightness attenuation curve, obtaining a first brightness attenuation coefficient; The first floating brightness of the first target brightness information is corrected according to the first brightness attenuation coefficient.

[0065] It should be noted that in this embodiment, a temperature compensation logic is provided. The temperature value of the Mini LED of each partition is detected in real time by a temperature sensor, and a first brightness attenuation coefficient is dynamically generated according to the temperature-brightness attenuation curve; then, the first floating brightness of the first target brightness information of the corresponding partition is corrected according to the first brightness attenuation coefficient to compensate for the problem of brightness reduction caused by temperature increase. The compensation coefficient is only used to adjust the floating brightness to achieve detailed adjustment, thereby improving the accuracy of the partition brightness.

[0066] It is worth mentioning that it also includes: According to the reference current information, a brightness life coefficient is obtained; Sending the brightness life coefficient and the working time to a preset aging neural network model for prediction to obtain a second brightness attenuation coefficient; The first floating brightness of the first target brightness information is corrected according to the second brightness attenuation coefficient.

[0067] It should be noted that in this embodiment, an aging compensation logic is provided. By recording the reference current during the operation of the Mini LED, the brightness life coefficient is converted according to the preset life formula. The brightness life coefficient and the luminous time are sent to the preset aging neural network model for prediction to obtain a second brightness attenuation coefficient; then, the first floating brightness of the first target brightness information of the corresponding partition is corrected according to the second brightness attenuation coefficient to compensate for the brightness drop caused by aging.

[0068] It is worth mentioning that it also includes: The backlight refresh frequency is set to an integer multiple of the screen refresh frequency; The backlight refresh frequency is set in the range of 2KHz to 4KHz.

[0069] It should be noted that in this embodiment, the backlight refresh frequency is set to an integer multiple of the picture refresh frequency to reduce dynamic picture smearing. In addition, the backlight frequency is set at 2KHz to 4KHz to reduce the backlight flicker problem.

[0070] 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.

[0071] In summary, the present invention provides a driving method, system and storage medium for a high-contrast Mini LED backlight module. First, based on the array arrangement rule 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, and the first target brightness information of each partition is determined through histogram statistics and metadata analysis; then, the brightness deviation of adjacent partitions is detected, and the gradient interpolation algorithm is used to smoothly adjust the area exceeding the preset threshold, and the second target brightness information is generated to suppress the halo effect. At the same time, the constant current output and PWM duty cycle are configured respectively in combination with the reference current and the floating current to achieve fine dimming in the low-brightness area and stable output in the high-brightness area. In addition, the standard brightness data is collected through the factory calibration mode to generate a compensation coefficient matrix, and the partition brightness is dynamically corrected during operation. The temperature sensor is combined to monitor and compensate for the brightness attenuation caused by temperature rise in real time to ensure brightness uniformity.

[0072] If the functions are implemented in the form of software function 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 part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several 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: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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; Based on the preset backlight refresh frequency, image information is obtained; Based on the metadata and the preset histogram statistical logic, obtaining first target brightness information according to the image information; According to the first target brightness information, the target brightness deviation of the adjacent partitions is detected, and based on a preset coupling suppression algorithm, the second target brightness information is obtained; According to the second target brightness information, obtaining reference current information and floating current information; According to the first channel information and the reference current information, configuring the dimming constant current output of the backlight module of the corresponding partition; 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.

2. The driving method of a high contrast Mini LED backlight module according to claim 1, characterized in that: The metadata specifically includes: Based on the maximum brightness of the current frame image, obtaining first brightness information; Obtaining second brightness information based on an average value of the highest brightness of a preset number of picture frame images; Determining whether the first brightness information is greater than the second brightness information; If yes, then 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, compress the first brightness information according to the second brightness information.

3. The driving method of a high contrast Mini LED backlight module according to claim 2, 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 information 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; Determine whether the partition brightness value exceeds the first brightness information; If yes, compressing the partition brightness value according to the first brightness information; The difference between the partition brightness value and the first reference brightness of the first target brightness information is calculated to obtain the first floating brightness of the first target brightness information.

4. The driving method of a high contrast Mini LED backlight module according to claim 1, characterized in that: The step of detecting the target brightness deviation of adjacent partitions according to the first target brightness information and obtaining the second target brightness information based on a preset coupling suppression algorithm is specifically as follows: A first target brightness curve and a second target brightness curve are obtained based on the horizontal and vertical directions of the backlight module array arrangement respectively; Determine 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.

5. 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.

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

7. A driving system for a high contrast Mini LED backlight module, characterized in that: The system includes a memory and a processor, wherein the memory includes a driving method program of a high-contrast Mini LED backlight module, and when the driving method program of 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; Based on the preset backlight refresh frequency, image information is obtained; Based on the metadata and the preset histogram statistical logic, obtaining first target brightness information according to the image information; According to the first target brightness information, the target brightness deviation of the adjacent partitions is detected, and based on a preset coupling suppression algorithm, the second target brightness information is obtained; According to the second target brightness information, obtaining reference current information and floating current information; According to the first channel information and the reference current information, configuring the dimming constant current output of the backlight module of the corresponding partition; 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.

8. The driving system of a high contrast Mini LED backlight module according to claim 7, characterized in that: Based on the maximum brightness of the current frame image, obtaining first brightness information; Obtaining second brightness information based on an average value of the highest brightness of a preset number of picture frame images; Determining whether the first brightness information is greater than the second brightness information; If yes, then 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, compress the first brightness information according to the second brightness information.

9. The driving system of a high contrast Mini LED backlight module according to claim 7, 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 information 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; Determine whether the partition brightness value exceeds the first brightness information; If yes, compressing the partition brightness value according to the first brightness information; The difference between the partition brightness value and the first reference brightness of the first target brightness information is calculated to obtain the first floating brightness of the first target brightness information.

10. 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 as described in any one of claims 1 to 6 are implemented.

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