A backlight module and a brightness compensation adjusting method thereof

Abstract

The application relates to the technical field of light source control, in particular to a brightness compensation adjustment method for a backlight module and the backlight module. The method comprises the following steps: collecting an image sequence and a level value; screening a jump point based on the gray scale level value of different channels under backlight partition; determining a jump amplitude statistical quantity according to the difference between the jump point and the jump amplitude difference of the buffer area; constructing a jump vector according to the jump amplitude statistical quantity and the gray scale value, dividing a partition group based on the similarity of the jump limit quantity, screening a similar partition group of each partition group, determining the visual saliency deviation of the partition group based on the characteristic difference of the partition group and the similar partition group, and adjusting the brightness value based on the visual saliency deviation. The application improves the display uniformity of different partitions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of light source control, in particular to a brightness compensation adjustment method for a backlight module and the backlight module. BACKGROUND

[0002] The light source emitted by the backlight module needs to pass through multiple layers of optical structures to correct the solid angle of the light beam and improve the overall brightness. However, during the actual production of the light source, there is a certain tolerance between the optical composite film and the structure of the light source itself, which causes the reflection and refraction efficiency of the light to be inconsistent, resulting in a deviation in the angle of the microstructure in some areas, and finally causing abnormal brightness in the backlight display area. The light field adjustment brightness is carried out through the brightness difference in the current area, so after the independent light adjustment of the partition, the current partition will cause light overflow, which will affect the light reflection result of the surrounding area. Therefore, during the light adjustment process, the edge will cause the edge brightness of the partition to jump or decay due to the light field diffusion, resulting in poor continuity of the light brightness between the partitions, and thus the uniformity of the compensated backlight is lower.

[0003] The prior art carries out multi-directional light collection through the light collection film, then carries out statistics on the diffusion boundary of the overall brightness field of the other partitions, so as to sample the unreasonable pixel brightness diffusion direction and evaluate the overall display effect, and then judges whether there is brightness overflow through the guide signal in the light emission process. However, in the display result of high resolution and HDR (High Dynamic Range), the display uniformity of the brightness is realized through the significant contrast between bright and dark positions, and the brightness overflow diffusion effect caused by the adjacent two partitions with large brightness deviation will cause the display restoration problems such as white in dark area and black in bright area, so it is necessary to optimize the accuracy of compensation under high dynamic range display. SUMMARY

[0004] In order to solve the technical problem of low uniformity of the compensated backlight, the present application provides a brightness compensation adjustment method for a backlight module and the backlight module, and the technical solutions adopted are as follows:

[0005] The present application provides a brightness compensation adjustment method for a backlight module, which comprises the following steps:

[0006] Collecting image sequences and level values of different channels of the images;

[0007] In one backlight partition, the gray scale diagrams of all images in the same channel are combined to form a channel sequence; the jump points in the channel sequence are screened based on the first-order residual of the level values in the channel sequence; the jump amplitude is obtained based on the level value difference and the time sequence difference between the jump point and the previous jump point; and the jump amplitude statistics of each channel at the current time are obtained based on the jump amplitude difference of the jump point and all jump points in the buffer area and the standard deviation of the jump amplitude.

[0008] The jump amplitude statistics and the gray value of each backlight partition form a jump vector; the backlight partitions are merged and divided into a plurality of partition groups based on the similarity between the jump vectors of the backlight partitions; the similarity standard deviation of the partition group is obtained based on the similarity between all the backlight partitions in the partition group, and the minimum value thereof is used to screen similar partition groups in adjacent partition groups; the visual saliency deviation of the partition group is determined based on the area difference between the partition group and the adjacent partition group, the difference of the similarity standard deviation, and the difference of the brightness value;

[0009] The brightness value of each backlight partition is adjusted based on the visual saliency deviation of each partition group.

[0010] In the above scheme, the present application first screens the jump point based on the channel sequence of the backlight interval, so as to display the variation amplitude of the channel gray value, and then judges the required level value, so as to ensure the display uniformity of the current partition; then the jump amplitude statistics is calculated, and the cache area size is diluted, so as to realize the measurement of the total deflection amount of the level signal to the channel cache space; for the problem of display result distortion, the backlight partitions are grouped, and the difference of the display brightness is realized based on the similarity and characteristics of the backlight partitions, so as to ensure the display uniformity of different partitions; the backlight module selects the composite brightness enhancement film with the inverse prism as the back structure, which can converge the large-angle light entering the light entrance once, reduce the light loss, and improve the center brightness of the backlight; the composite brightness enhancement film with the inner concave trapezoidal four-prism or six-prism as the front structure can converge the large-angle P light out of the light exit twice, reduce the light loss again, and further improve the center brightness of the backlight.

[0011] In one embodiment, the image sequence is composed of images at the current time and images in the buffer area in time sequence order, and the images in the buffer area are images after the current time.

[0012] In one embodiment, the method for screening the jump point in the channel sequence based on the first-order residual of the level value in the channel sequence is as follows:

[0013] For any backlight partition, the first-order residual of all the level values in any channel sequence is calculated, and the mean value and the standard deviation of the first-order residual are calculated; the display interval is constructed by using the mean value and the standard deviation of the first-order residual, and the level points outside the display interval are recorded as the jump points.

[0014] In one embodiment, the method for obtaining the jump amplitude based on the difference of the level value and the time sequence difference between the jump point and the previous jump point is as follows:

[0015] , denotes the level value of the i-1th jump point, denotes the level value of the ith jump point, a time sequence label representing the i th jump point, a time sequence label representing the i-1 th jump point, a jump amplitude representing the i th jump point.

[0016] In an embodiment, the method for obtaining the jump amplitude statistics of each channel at the current time based on the jump points and the jump amplitude differences of all jump points in the cache area is as follows:

[0017] The jump amplitude statistics is positively correlated with the jump amplitude differences of all jump points in the cache area and the standard deviation of the jump amplitude of the jump point.

[0018] In an embodiment, the method for merging and dividing the backlight partitions into multiple partition groups based on the similarity between the backlight partition jump vectors is as follows:

[0019] For each backlight partition, the maximum value of the similarity of the jump vector corresponding to the backlight partition with all the remaining backlight partitions is recorded as the backlight similarity; the backlight similarity of each backlight partition is calculated, the average value of all the backlight similarities is calculated, the backlight partitions greater than the average value of the backlight similarity are marked, and each backlight partition is merged with the marked backlight partition with the maximum value of the similarity, thereby completing the grouping of the backlight partitions, which is recorded as a partition group.

[0020] In an embodiment, the method for obtaining the similarity standard deviation of the partition group based on the similarity between all the backlight partitions in the partition group and screening the similar partition groups in the adjacent partition groups with the minimum value of the similarity standard deviation is as follows:

[0021] The standard deviation of the similarity of all the backlight partitions in each partition group is calculated and recorded as the similarity standard deviation, and all the adjacent partition groups of the current partition group are extracted, the difference between the partition similarity standard deviation of each partition group and each adjacent partition group is calculated, and the adjacent partition group corresponding to the minimum value of the difference is recorded as the similar partition group.

[0022] In an embodiment, the method for determining the visual saliency deviation of the partition group based on the area difference, the difference of the similarity standard deviation, and the luminance value difference between the partition group and the adjacent partition group is as follows:

[0023] The visual saliency deviation is positively correlated with the area difference and the luminance value difference, and is negatively correlated with the difference of the similarity standard deviation; the luminance value of the partition group is the average value of the gray values of all the pixel points in the partition group.

[0024] In a second aspect, the application provides a backlight module, which is composed of an increment film, a reflection film and a diffusion film. The increment film comprises three parts: an upper part, a middle part and a lower part. The upper part is a core layer, the middle part is a transparent substrate layer and the lower part is a prism film layer. There is a bonding layer between any two adjacent parts. There are diffusion particles in the bonding layer between the core layer and the transparent substrate layer.

[0025] In one embodiment, the front structure of the backlight module is a composite brightness enhancement film with a concave trapezoidal quadrangular prism or hexagonal pyramid, and the back structure is a composite brightness enhancement film with an inverse prism as the back structure.

[0026] The application has the following advantages:

[0027] Firstly, the application screens a jump point based on the channel sequence of the backlight region, thereby displaying the variation range of the channel gray value, and then determining the required level value to ensure the display uniformity of the current partition. Then, the application dilutes the size of the cache area to realize the measurement of the total deflection amount of the level signal for the channel cache space. For the problem of display result distortion, the application groups the backlight partitions, and realizes the difference in display brightness based on the similarity and characteristics of the backlight partitions to ensure the display uniformity of different partitions. The backlight module selects a composite brightness enhancement film with an inverse prism as the back structure, which can converge the large-angle light entering the light surface once, reduce light loss and improve the center brightness of the backlight. The composite brightness enhancement film with an inner concave trapezoidal quadrangular prism or hexagonal pyramid as the front structure can converge the large-angle P light exiting the light surface twice, further reduce light loss and further improve the center brightness of the backlight. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0029] Figure 1 A brightness compensation adjustment method for a backlight module and a flowchart of the backlight module are provided for an embodiment of the application.

[0030] Figure 2 The backlight module has a front structure of a concave trapezoidal quadrangular prism.

[0031] Figure 3 The backlight module has a front structure of a concave hexagonal pyramid. DETAILED DESCRIPTION

[0032] To further clarify the technical means and effects taken by the present application to achieve the predetermined object of the application, the following describes in detail the specific embodiments, structure, features and effects of a brightness compensation adjustment method for a backlight module and the backlight module thereof according to the present application, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0034] A brightness compensation adjustment method for a backlight module and a backlight module thereof embodiment:

[0035] The specific scheme of the brightness compensation adjustment method for a backlight module and the backlight module thereof provided by the present application is described in detail below in combination with the accompanying drawings.

[0036] Please refer to Figure 1 , which shows a flowchart of a brightness compensation adjustment method for a backlight module and the backlight module thereof provided by one embodiment of the present application. The method comprises the following steps:

[0037] Step S001, collect image sequences and level values of different channels of the images.

[0038] Image data is transmitted into the backlight module through image processing. The RGB components of each pixel in the image are encoded in 8 bits (i.e. RGB888 format), which is 24 bits of parallel data. The HDMI interface includes two TMDS clock signals and six TMDS data signals, which respectively transmit 8-bit data of the R, G and B three channels.

[0039] The ADV7619 receives the TMDS signals of the HDMI interface and decodes them into parallel RGB data (24bit) and clock signals. The decoded RGB data format is 8 bits per channel (R, G, B), i.e. eight bits of data per channel, and the clock signal is used to synchronize the display timing. The decoded RGB data generates a VGA timing signal through an FPGA module. The VGA interface requires a row synchronization signal (HSYNC) and a field synchronization signal (VSYNC), as well as RGB data. The FPGA module configures the timing parameters according to the VESA standard to ensure that the RGB signal is output in 24bit format (RGB888). The original image data is obtained after transmission to obtain an image with timing labels, which is stored in a register.

[0040] Sort all images with time label according to time label size to obtain image sequence, and obtain the level value of each channel for each image in the image sequence. The number of images in the image sequence is composed of the image at the current time and a plurality of images in the buffer area. In the embodiment, the number of images in the buffer area is 99.

[0041] Up to now, the image sequence and the level value of different channels of the image in the image sequence are obtained.

[0042] In step S002, the jump amplitude statistics is determined according to the difference between the jump point and the buffer jump amplitude.

[0043] Due to the different results of the image content displayed in real time, the brightness compensation is performed to distinguish the area contrast relationship between the image display, and the amplitude of the activation signal stored in the backlight partition can represent the connection of the bright and dark contrast, so as to judge the brightness requirement level of the image display through the change of the direction of the output signal level, and further perform the high dynamic range light compensation regulation on the brightness contrast results between different levels.

[0044] Firstly, the display brightness level of a single backlight partition is evaluated. There are a plurality of color channels for each image; in the embodiment, the RGB channel. For the image sequence, the same arbitrary channel of all images constitutes a channel sequence, and the element in the channel sequence is the gray scale image of each image in the channel. In the embodiment, there are three channel sequences. Each channel of each image is a level point.

[0045] For any one backlight partition, the first-order residual of all level values in any one channel sequence is calculated, and the mean and standard deviation of the first-order residual are calculated. Further, the display interval is constructed by the mean and standard deviation of the first-order residual, and the level points outside the display interval are recorded as jump points. In the embodiment, the display interval is , wherein is the mean of the first-order residual, is the standard deviation of the first-order residual.

[0046] The display result of the brightness and the level value of the level point represent the content displayed by the backlight partition, and the consistency of the picture displayed by the current backlight partition and the display gray scale variation amplitude jump of the picture to be displayed are judged.

[0047] After the jump point is obtained, the overall jump amplitude of the display jump point is further evaluated: the concentration frequency of the jump amplitude in the jump range process, that is, due to the large gray scale amplitude of the display brightness, a larger level value is required to provide a faster gray scale response to ensure the display uniformity of the backlight partition.

[0048] For each jump point, the level change rate of the jump point with respect to the previous jump point is obtained as the jump amplitude.

[0049] In the embodiment, the expression of the jump amplitude is:

[0050] , denotes the level value of the i-1th jump point, denotes the level value of the ith jump point, denotes the timing label of the ith jump point, denotes the timing label of the i-1th jump point, denotes the jump amplitude of the ith jump point.

[0051] The jump amplitude difference of each jump point in the channel sequence and all jump points in the buffer area is calculated, and the jump amplitude statistics of the current time is evaluated in combination with the standard deviation of the jump amplitude of the jump point.

[0052] The jump amplitude statistics is positively correlated with the jump amplitude difference of the jump point and all jump points in the buffer area, and is negatively correlated with the standard deviation of the jump amplitude of the jump point.

[0053] It should be noted that the positive correlation means that when one variable increases, the other variable also increases, and the two variables change in the same direction. When one variable changes from large to small or from small to large, the other variable also changes from large to small or from small to large. The specific relationship is determined by actual application, and the present application does not make special limitation.

[0054] It should be noted that the negative correlation means that when one variable increases, the other variable decreases, and the two variables change in opposite directions. When one variable changes from large to small or from small to large, the other variable also changes from small to large or from large to small. The specific relationship is determined by actual application, and the present application does not make special limitation.

[0055] Preferably, the expression of the jump amplitude statistics is:

[0056] , denotes the jump amplitude of the ith jump point, denotes the mean value of the jump amplitudes of all jump points in the buffer area in the channel a, denotes the standard deviation of the jump amplitudes of all jump points in the buffer area in the channel a, denotes the number of jump points in the buffer area in the channel a, denotes the jump amplitude statistics of the channel a at the current time.

[0057] Thus, the jump amplitude statistics of each channel at the current time is obtained.

[0058] Step S003, a jump vector is constituted according to the jump amplitude statistics and the gray value, the partition groups are divided based on the similarity of the jump limit, and the similar partition groups of each partition group are screened, and the visual saliency deviation of the partition group is determined based on the feature difference of the partition group and the similar partition group.

[0059] For the display channel of the current backlight module, the real-time jump demand between the display channels is judged, the amplitude control between the partitions is performed, and the amplitude compensation of the step interface position module is performed through the step situation of the jump demand result between the partitions, so that the brightness connection of the partitions is performed to regulate and control the partition compensation amount.

[0060] Due to the change of the display result, the change of the display direction between the display content partition and the remaining partitions, and the contrast deviation of the output content, the obvious brightness step is visually reflected. At this time, the compensation of the backlight module will weaken the bright and dark difference of the display content. Even if the brightness of the bright area is further increased, the light condensing film will overflow the backlight result of the bright area to the display content of the dark area, causing the originally displayed content of the image to become bright and white, resulting in distortion of the display result.

[0061] According to the evaluation of the jump amplitude performance of the display content between the partitions, the directionality control is output, the main jump channel of the single backlight partition is selected, and the main jump channel between the channels of different backlight partitions is combined.

[0062] The jump typical index between the backlight partitions is judged for mutual consistency, so as to adaptively adjust the backlight compensation ratio.

[0063] The display jump of the single backlight partition is evaluated: compared with the register display result of the adjacent backlight partition, the jump direction is similar to the deviation of the highlighted display.

[0064] For each backlight partition, the jump amplitude statistics of each channel at the current time are obtained, the jump amplitude statistics are sequentially sorted according to the order of the image channels, then the gray values of the channels are sequentially sorted, and the jump vector of each partition is obtained. In this embodiment, since the RGB image is used, the R channel, G channel and B channel are sorted, and the jump vector of the backlight partition A is . Wherein, 、 、 R, G and B are respectively the jump amplitude statistics of the R, G and B channels; 、 、 R, G and B are respectively the gray values of the R, G and B channels.

[0065] The similarity of each backlight partition to the surrounding backlight partition jump is calculated, so as to extract the approximate backlight partition; the similarity of the backlight partition is obtained by the similarity of the jump vector corresponding to the backlight partition.

[0066] For each backlight partition, the maximum value of the similarity of the jump vector corresponding to the backlight partition is recorded as the backlight similarity; the backlight similarity of each backlight partition is calculated, the average value of all backlight similarities is calculated, the backlight partition greater than the average value of the backlight similarity is marked, and each backlight partition is combined with the marked backlight partition with the maximum value of the similarity, so as to complete the grouping of the backlight partition, which is recorded as the partition group.

[0067] For each partition group, all the jump vectors are sorted in the column direction, all the jump vectors are formed into a jump vector matrix, and the average value of the column is taken in the column direction and placed in the corresponding position of an empty jump vector, so as to obtain the jump vector of the partition group.

[0068] The standard deviation of the similarity of all the backlight partitions in each partition group is further calculated and recorded as the similarity standard deviation, and all the partition groups adjacent to the current partition group are extracted, the difference between the partition similarity standard deviation of each partition group and each adjacent partition group is calculated, and the adjacent partition group corresponding to the minimum difference is recorded as the similar partition group.

[0069] The visual saliency deviation of the partition group is determined based on the area difference between the partition group and the adjacent partition group, the difference of the similarity standard deviation, and the brightness difference.

[0070] The visual saliency deviation has a positive correlation with the area difference and the brightness difference respectively, and has a negative correlation with the difference of the similarity standard deviation.

[0071] Preferably, the expression of the visual saliency deviation is:

[0072] , The partition similarity standard deviation of the partition group S, The partition similarity standard deviation of the similar partition group of the partition group S, The partition area of the partition group S, The partition area of the similar partition group of the partition group S, The brightness value of the partition group S, The brightness value of the similar partition group of the partition group S, The visual saliency deviation of the partition group S, and the brightness value of the partition group is the average value of the gray values of all the pixel points in the partition group.

[0073] In the formula, The area difference of the partitions of the partition group is evaluated to obtain the influence difference of the display area, and the similarity standard deviation is used as the balance measure to reflect the consistency of the pixel point variation characteristics in the two regions. Further, the ratio of the brightness values of the current display materials of the two regions is used as the judgment of the current actual display brightness difference. , ,

[0074] Thus, the visual saliency difference of each partition group is obtained.

[0075] In step S004, the brightness value of each backlight partition is adjusted based on the visual saliency deviation of each partition group.

[0076] The updated brightness value is obtained by using the visual saliency deviation of each partition as a weight to adjust the brightness value using gamma dynamic correction, and then realizing the brightness adjustment of each partition based on PWM signal conversion.

[0077] One embodiment of the present application discloses a backlight module.

[0078] The backlight module is composed of an increment film, a reflection film and a diffusion film. The increment film includes an upper part, a middle part and a lower part. The upper part is a core layer, the middle part is a transparent base material layer, and the lower part is a prism film layer. There is a bonding layer between any two adjacent parts. Diffusion particles exist in the bonding layers of the core layer and the transparent base material layer.

[0079] Referring to Figure 2 and Figure 3 , the front surface structure of the backlight module is a concave trapezoidal quadrangular prism or a hexagonal pyramid. The above structure can collect light in different directions when matched with a prism. The backlight module selects a composite brightness enhancement film with an inverse prism as the back surface structure, which can converge the large-angle light entering the light entrance surface once, reduces the loss of light, and improves the central brightness of the backlight. The composite brightness enhancement film with an inner concave trapezoidal quadrangular prism or a hexagonal pyramid as the front surface structure can converge the large-angle P light exiting the light exit surface twice, further reduces the loss of light, and further improves the central brightness of the backlight.

[0080] It should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features. These modifications or replacements do not change the essence of the corresponding technical solutions, and should be included in the protection scope of the present application.

[0081] Each embodiment in the specification is described in a progressive manner, and the same or similar parts of each embodiment can be referred to each other. Each embodiment mainly describes the differences from other embodiments.

Claims

1. A brightness compensation adjustment method for a backlight module, characterized in that, The method includes the following steps: Acquire image sequences and the level values ​​of different channels of the images; In a backlight partition, grayscale images of all images in the same channel are used to form a channel sequence; transition points in the channel sequence are filtered based on the first-order residual of the level values ​​within the channel sequence; the transition amplitude is obtained based on the difference in level value and timing between the transition point and its predecessor; the transition amplitude statistics of each channel at the current moment are obtained based on the difference in transition amplitude between the transition point and all transition points in the buffer and the standard deviation of the transition amplitude. The jump amplitude statistics and grayscale values ​​of each backlight zone are used to construct a jump vector; based on the similarity between the jump vectors of the backlight zones, the backlight zones are merged and divided into multiple zone groups; based on the similarity between all backlight zones within a zone group, the similarity standard deviation of the zone group is obtained, and the minimum value is used to filter similar zone groups in adjacent zone groups; the visual significance deviation of the zone group is determined based on the area difference, the difference in similarity standard deviation, and the difference in brightness value between the zone group and adjacent zone groups. The brightness values ​​of each backlight zone are adjusted based on the visual saliency deviation of each zone group. The method for filtering transition points in a channel sequence based on the first-order residual of the level value within the channel sequence is as follows: For any backlight zone, calculate the first-order residuals of all level values ​​in any channel sequence, and calculate the mean and standard deviation of the first-order residuals; construct a display interval using the mean and standard deviation of the first-order residuals, and record the level points outside the display interval as transition points; The method for merging and dividing backlight partitions into multiple partition groups based on the similarity between backlight partition transition vectors is as follows: For each backlight partition, the maximum similarity between it and the transition vectors corresponding to all other backlight partitions is recorded as the backlight similarity; calculate the backlight similarity of each backlight partition, calculate the mean of all backlight similarities, mark the backlight partitions that are greater than the mean of the backlight similarity, and merge each backlight partition with the marked backlight partitions whose maximum similarity is obtained, thus completing the grouping of backlight partitions, which is recorded as a partition group; The method for obtaining the similarity standard deviation of a partition group based on the similarity between all backlight partitions within the partition group, and using its minimum value to filter similar partition groups among adjacent partition groups, is as follows: Calculate the standard deviation of the similarity of all backlight zones in each partition group and record it as the similarity standard deviation. Extract all partition groups adjacent to the current partition group, calculate the difference of the partition similarity standard deviation between each partition group and each of its adjacent partition groups, and record the adjacent partition group corresponding to the minimum difference as the similar partition group.

2. The brightness compensation adjustment method for a backlight module as described in claim 1, characterized in that, The image sequence consists of the image at the current moment and the images in the buffer arranged in chronological order, and the images in the buffer are images after the current moment.

3. The brightness compensation adjustment method for a backlight module as described in claim 1, characterized in that, The method for obtaining the transition amplitude based on the difference in level and timing between the transition point and its predecessor is as follows: , This represents the level value at the (i-1)th transition point. This represents the voltage level at the i-th transition point. The time label represents the i-th transition point. This represents the timing label of the (i-1)th transition point. This represents the jump amplitude at the i-th jump point.

4. The brightness compensation adjustment method for a backlight module as described in claim 1, characterized in that, The method for obtaining the jump amplitude statistics of each channel at the current moment based on the jump amplitude difference between the jump point and all jump points in the buffer, and the standard deviation of the jump amplitude, is as follows: The jump amplitude statistic is positively correlated with the jump amplitude difference between the jump point and all jump points in the buffer, and negatively correlated with the standard deviation of the jump amplitude at the jump point.

5. The brightness compensation adjustment method for a backlight module as described in claim 1, characterized in that, The method for determining the visual saliency bias of a partition group based on the area difference, the difference in similarity standard deviation, and the difference in brightness value between the partition group and its adjacent partition groups is as follows: The visual saliency deviation is positively correlated with area difference and brightness value difference, and negatively correlated with similarity standard deviation difference; the brightness value of the partition group is the mean gray value of all pixels in the partition group.

6. A backlight module, characterized in that, The backlight module is composed of an incremental film, a reflective film, and a diffusion film. The incremental film includes three parts: an upper part is a core layer, a middle part is a transparent substrate layer, and a lower part is a prism film layer. An adhesive layer exists between any two adjacent parts. Diffusion particles are present in the adhesive layer between the core layer and the transparent substrate layer. The brightness compensation module in the backlight module implements the steps of the brightness compensation adjustment method for the backlight module as described in claim 1.

7. A backlight module as described in claim 6, wherein the front structure of the backlight module is a composite brightness enhancement film of a concave trapezoidal quadrangular prism or hexagonal pyramid, and the back structure is a composite brightness enhancement film with a reverse prism as the back structure.

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