A liquid crystal partition color adjusting system based on a mini-led backlight and a partition scanning method thereof

Abstract

The present application relates to a kind of liquid crystal partition color modulation system based on Mini-LED backlight and its partition scanning method, belong to liquid crystal display technical field.The present application divides entire backlight into several row direction large partitions according to horizontal direction, and each row direction large partition includes at least one backlight sub-partition.Liquid crystal partition color modulation system realizes the modulation of brightness and color information on backlight sub-partition by time color mixing principle;And parallel or serial scanning mode is used between each row direction backlight large partition.Different from traditional partition dimming mode, the liquid crystal partition color modulation system and backlight partition scanning technology of the present application can not only realize the modulation of brightness on each partition of backlight, but also realize the modulation of color.The present application is an effective method for realizing liquid crystal display with ultra-high resolution and ultra-high gray scale.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of liquid crystal display, and particularly relates to a liquid crystal partition color modulation system based on Mini-LED backlight and a partition scanning method thereof. BACKGROUND

[0002] In recent years, digital flat panel display technology represented by liquid crystal display has developed rapidly. This is due to the progress of liquid crystal material technology, the improvement of TFT manufacturing process and the improvement of digital circuit hardware processing speed, which makes the response speed of liquid crystal display faster, and the refresh rate is generally improved from 60Hz to 120Hz or even 240Hz, and the emerging Mini-RGB LED partition color modulation technology is introduced. These background technologies jointly promote the development of LED display technology, and the emergence of partition color modulation three-frame color mixing backlight display technology makes it possible for the next generation of display to comprehensively realize the requirements of high-definition picture, high refresh rate and HDR performance.

[0003] However, due to the existence of color mixing and slow response of liquid crystal molecules in the partition serial scanning method implemented by the emerging partition color modulation technology, the backlight off time is too long, which forms a picture ghosting or blurring effect. SUMMARY

[0004] The purpose of the present application is to overcome the deficiencies in the prior art, and to provide a liquid crystal partition color modulation system based on Mini-LED backlight and a partition scanning method thereof.

[0005] To achieve the above purpose, the technical scheme of the present application is: a liquid crystal partition color modulation system based on Mini-LED backlight, comprising:

[0006] A partition module is used to divide the backlight into a plurality of row direction large partitions in the horizontal direction, and each row direction large partition includes at least one backlight sub-partition.

[0007] A liquid crystal partition color modulation and scanning module is used to realize the separate modulation of brightness and color information on the backlight sub-partition, and the scanning mode between each row direction large partition is parallel, serial, odd-even partition or rolling.

[0008] The application also provides a partition scanning method of a liquid crystal partition color modulation system based on a Mini-LED backlight, the backlight is divided into a plurality of row direction large partitions in a horizontal direction, each row direction large partition comprises at least one backlight sub-partition, each backlight sub-partition is a rectangular backlight sub-partition with equal size, each backlight sub-partition corresponds to a plurality of pixel regions on a liquid crystal panel, and each backlight sub-partition comprises one Mini-LED light source with adjustable brightness of three primary colors; the scanning modes of the row direction large partitions include parallel, serial, odd-even partition or rolling; and the row direction large partitions are scanned row by row; three single-color sub-frames are used to light up the backlight in turn, in each single-color sub-frame period, the backlight sub-partitions in the row direction large partitions light up the light sources of corresponding colors according to the mapped backlight brightness values, and finally the brightness and color information are double-modulated in the backlight sub-partitions based on the time color mixing principle.

[0009] In an embodiment of the application, the partition scanning method is implemented as follows:

[0010] Step S1, determining the partition principle and the number of backlight sub-partitions and row direction large partitions;

[0011] Step S2, splitting a frame of color image to be displayed into three single-color sub-frames of red, green and blue;

[0012] Step S3, lighting up the red Mini-LED light sources of the corresponding backlight sub-partitions according to the timing requirements and mapping relationship in the red sub-frame;

[0013] Step S4, lighting up the green Mini-LED light sources of the corresponding backlight sub-partitions according to the timing requirements and mapping relationship in the green sub-frame;

[0014] Step S5, lighting up the blue Mini-LED light sources of the corresponding backlight sub-partitions according to the timing requirements and mapping relationship in the blue sub-frame;

[0015] Step S6, periodically repeating steps S2 to S5.

[0016] In an embodiment of the application, in step S1, the number of backlight sub-partitions is determined according to the number of I / O pins of the control chip of the used Mini-LED light source, the number of backlight sub-partitions in the row and column directions of the entire backlight module is L and H respectively, and L: H satisfies but is not limited to a common display ratio relationship such as 4:3 or 16:9; the corresponding pixel relationship in the backlight sub-partition is determined according to the selected display screen resolution, the number of row pixels and column pixels is X and Y respectively, and X: Y satisfies but is not limited to a common display ratio relationship such as 4:3 or 16:9; the backlight is divided into e row direction large partitions in a horizontal direction, and the number of row direction large partitions is M irepresents the i-th row direction large partition, i is an integer and 1≤i≤e, and the row direction large partition includes all backlight sub-partitions corresponding to the entire horizontal direction.

[0017] In an embodiment of the present application, the operation timing between the unlit backlight time T1, the backlight lit maintaining time T2, the backlight sub-partition light source brightness data establishing and transmission time T3, and the liquid crystal pixel molecule response time T4 within the single primary color sub-frame time T; in the red, green or blue sub-frame time T: first, simultaneously perform the operations within T1 and T3 time, then perform the operation within T4 time immediately after the end of T3 time, and there is a relationship of T1≥T 3+ T4; second, after T1 time, immediately perform the operation within T2 time, and satisfy the relationship of T=T1+T2.

[0018] In an embodiment of the present application, the mapping relationship between the backlight sub-partition three primary color light source brightness value and the different primary color image gray scale data is determined: after the gray scale data of a frame of image is separated according to R / G / B 3 single primary color sub-frames in step S2, the gray scale data values of the single color pixels corresponding to each backlight sub-partition range of the backlight are obtained, and then the single primary color brightness value corresponding to the LED light lighting in each backlight sub-partition is determined by the weighted summation method, and the mapping method is as follows:

[0019]

[0020] Wherein, N is the single primary color gray scale value corresponding to the LED light lighting in the corresponding backlight sub-partition, N 11 to N ij is the gray scale data value of the single color pixel corresponding to each backlight sub-partition range, and the coefficient K ij ∈[0,1].

[0021] In an embodiment of the present application, the specific implementation mode of realizing the double modulation of brightness and color information in the backlight sub-partition is: first, according to the function mapping relationship of the light source brightness data in the backlight sub-partition, the primary color brightness data values corresponding to the light sources of each backlight sub-partition are determined; then, according to the order of red, green and blue three sub-frames, the primary color light sources of the backlight sub-partition are lit as needed within the corresponding T2 time; finally, according to the time color mixing principle, the three sub-frames are synthesized and the modulation of different brightness and color of the Mini-LED light source of each backlight sub-partition is finally realized.

[0022] In one embodiment of the present invention, the serial scanning method involves sequentially scanning the large partitions in the row direction one by one. When a corresponding large partition in the row direction is scanned, all backlight sub-partitions of the corresponding large partition in the row direction and the previous large partition in the row direction are turned off. All backlight sub-partitions that have not been scanned are illuminated according to their corresponding color and brightness values. The method is as follows: according to M1, M2, ..., M e The sequence of large partitions in the row direction is rotated in turn. When the large partition in the row direction M1 is scanned, M is turned off. e M1 is a large-area backlight in the row direction, while M2, ..., M1 are also turned on. e-1 Large row-direction backlight; when the large row-direction M2 is scanned, turn off the large row-direction backlights of M1 and M2, and simultaneously turn on the backlights of M3, ..., M... e Large-area backlighting along the horizontal direction repeats periodically; and T1 / T satisfies (M e +M1) / (M1+M2+M3+……+M e T2 / T satisfies (M2 + ... + M) e-1 )

[0023] / (M1+M2+M3+……+M e ).

[0024] In one embodiment of the present invention, the odd-even interleaved scanning method involves alternating scanning of large partitions in the row direction, either odd-first then even or even-first then odd, according to the odd-even order. When a corresponding large partition in the row direction is scanned, all backlight sub-partitions within that large partition and the preceding large partition in the row direction are turned off. All unscanned backlight sub-partitions are illuminated according to their corresponding color and brightness values. The method is as follows: Let e ​​be an even number. During row-by-row scanning, according to M1, M3, ..., M... e-1 M2, M4, ..., M e The system sequentially scans the pixels of the large partitions in the row direction in turn. When it scans the pixel region corresponding to the large partition in the row direction M1, it turns off M1. e M1 row direction large zone backlight, simultaneously turn on M3, M5, ... M e-1 M2, M4, ..., M e-2 Large row-direction backlight; when scanning the M3 large row-direction partition, turn off the backlights of the M1 and M3 large row-direction partitions, and simultaneously turn on the backlights of M5, M7, ..., M... e-1 M2, M4, M6, ..., M e Large-area backlighting, repeating periodically; and, T1 / T satisfies (M e +M1) / (M1+M2+M3+……+M e T2 / T satisfies (M2 + ... + M) e-1 ) / (M1+M2+M3+……+M e ).

[0025] In an embodiment of the present application, the backlight sub-division in horizontal direction adopts a rolling data refreshing and lighting method: through the response time T4 of liquid crystal pixel molecules and the number of pixel rows l corresponding to a single backlight sub-division, the backlight block of the backlight sub-division containing m rows is determined, and the light source in the backlight block should be turned off, l>m; when scanning from the first row of backlight sub-division to the mth row of backlight sub-division, the light source of the m rows of backlight sub-division is turned off and the data refreshing is completed; when scanning to the m+1 row of backlight sub-division, the first row of backlight sub-division is lit according to the refreshed data, while the light source of the m+1 row of backlight sub-division is turned off; when scanning to the m+2 row, the second row of backlight sub-division is lit according to the refreshed data, while the light source of the m+2 row of backlight sub-division is turned off; the cycle is periodically executed until the last row of backlight sub-division is lit according to the refreshed brightness value, finally realizing the rolling refreshing and lighting of the backlight sub-division in horizontal direction.

[0026] Compared with the prior art, the present application has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the backlight module structure and parallel scanning schematic diagram in the present application;

[0028] Figure 2 It is the backlight module structure diagram in the present application;

[0029] Figure 3 It is the single backlight sub-division structure and corresponding liquid crystal pixel schematic diagram in the present application;

[0030] Figure 4 It is the backlight and liquid crystal response curve diagram changing with time in the present application;

[0031] Figure 5 It is the flow chart of the present application;

[0032] Figure 6 It is the timing diagram of the present application;

[0033] Figure 7 It is the rolling data refreshing and lighting method schematic diagram of the present application;

[0034] Figure 8 It is the row large sub-division serial scanning mode and backlight large sub-division lighting schematic diagram of the present application;

[0035] Figure 9 It is the row large sub-division parallel scanning mode and backlight large sub-division lighting schematic diagram of the present application;

[0036] Figure 10 It is the odd-even partition scanning mode and backlight large sub-division lighting schematic diagram of the present application;

[0037] Legend: R: red mini-LED backlight; G: green mini-LED backlight; B: blue mini-LED backlight; T: a sub-frame time; BL: backlight; line_0-line_n: horizontal scanning line; n: the number of row partitions contained in each row partition; m: the number of row partitions with turned-off backlight; l: the total number of row partitions of the backlight module. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings.

[0039] The present application provides a liquid crystal partition color modulation system based on Mini-LED backlight, comprising:

[0040] A partition module is used to divide the backlight into a plurality of row direction macro-partitions in the horizontal direction, and each row direction macro-partition includes at least one backlight sub-partition.

[0041] A liquid crystal partition color modulation and scanning module is used to realize the separate modulation of the brightness and color information of the backlight sub-partitions, and the scanning modes of parallel, serial, odd-even partition or rolling are used between each row direction macro-partition.

[0042] The present application also provides a partition scanning method for a liquid crystal partition color modulation system based on Mini-LED backlight. The backlight is divided into a plurality of row direction macro-partitions in the horizontal direction, and each row direction macro-partition includes at least one backlight sub-partition. Each backlight sub-partition is a rectangular backlight sub-partition of equal size, and each backlight sub-partition corresponds to a plurality of pixel regions on the liquid crystal panel. A single backlight sub-partition includes a Mini-LED light source with separately adjustable brightness of three primary colors. The scanning modes of parallel, serial, odd-even partition or rolling are used between the row direction macro-partitions, and the row-by-row scanning is used inside the row direction macro-partition. Three single-color sub-frames are used to rotate the backlight. In each single-color sub-frame period, the backlight sub-partitions in the row direction macro-partition respectively light up the light sources of the corresponding color according to the mapped backlight brightness value. Based on the time color mixing principle, the dual modulation of the brightness and color information is finally realized in the backlight sub-partition. As shown in the figure, the specific implementation steps of the partition scanning method are as follows: Figure 5

[0043] Step S1, determining the partition principle and the number of partitions of the backlight sub-partitions and the row direction macro-partitions;

[0044] Step S2, splitting a frame of color picture to be displayed into three single-color sub-frames of red, green and blue;

[0045] Step S3, in the red sub-frame, lighting up the red mini-LED light source of the corresponding backlight sub-partition according to the timing requirements and the mapping relationship;

[0046] ​Step S4, in the green sub-frame, according to the timing requirements and mapping relationship, light up the corresponding backlight sub-partition green mini-LED light source;

[0047] Step S5, in the blue sub-frame, according to the timing requirements and mapping relationship, light up the corresponding backlight sub-partition blue mini-LED light source;

[0048] Step S6, periodically repeat steps S2 to S5.

[0049] In this embodiment, in step S1, the number of backlight sub-partitions is determined according to the number of I / O pins of the control chip of the used Mini-LED light source, and the number of backlight sub-partitions in the row and column directions of the entire backlight module is L and H respectively, and L:H satisfies but is not limited to the common display ratio relationship of 4:3 or 16:9; as shown in Figure 3 , the corresponding pixel relationship in the backlight sub-partition is determined according to the selected display screen resolution, and the number of row and column pixels is X and Y respectively, and X:Y satisfies but is not limited to the common display ratio relationship of 4:3 or 16:9; as shown in Figure 2 , the backlight is divided into e row direction large partitions in the horizontal direction, and the i-th row direction large partition is represented by M i , i is an integer and 1≤i≤e, and the row direction large partition includes all backlight small partitions corresponding to the entire horizontal direction.

[0050] In this embodiment, as shown in Figure 4 , 6 , the single primary color sub-frame time T includes the unlit backlight source time T1, the backlight lighting maintenance time T2, the light source brightness data establishment and transmission time T3 in the backlight sub-partition, and the operation timing between the response time T4 of the liquid crystal pixel molecule; in the red, green or blue sub-frame time T: first, simultaneously execute the operation in T1 and T3 time, then execute the operation in T4 time immediately after the end of T3 time, and there is a relationship of T1≥T 3+ T4; secondly, after T1 time, the operation in T2 time is immediately executed, and it satisfies the relationship of T=T1+T2.

[0051] In this embodiment, the mapping relationship between the brightness value of the backlight sub-partition three primary color light source and the different primary color image gray scale data is determined: in step S2, the gray scale data of a frame of image is separated according to R / G / B 3 single primary color sub-frames, and the gray scale data value of the corresponding single color pixel in each backlight sub-partition range of the backlight is obtained, then the single primary color brightness value corresponding to the LED lamp lighting in each backlight sub-partition is determined by the method of weighted summation, and the mapping method is as follows:

[0052]

[0053] Wherein, N is the single base color gray scale value corresponding to the LED light point of the corresponding backlight sub-zone, N 11 to N ij is the gray scale data value of the corresponding single color pixel in the range of the corresponding backlight sub-zone, and the coefficient K ij ∈[0, 1].

[0054] In this embodiment, the specific implementation of realizing the double modulation of brightness and color information in the backlight sub-zone is as follows: first, the base color brightness data value corresponding to the light source of each backlight sub-zone is determined according to the function mapping relationship of the light source brightness data in the backlight sub-zone; then, the base color light source of the backlight sub-zone is lit on demand in the corresponding T2 time in the order of red, green, and blue sub-frames; finally, according to the principle of time color mixing, the three sub-frames are synthesized and the modulation of different brightness and color of the Mini-LED light source of each backlight sub-zone is finally realized.

[0055] In this embodiment, as shown in Figure 8 , the serial scanning mode is to scan the row direction macro-zone one by one in order, and when the corresponding row direction macro-zone is scanned, all the backlight sub-zones of the corresponding row direction macro-zone and the previous row direction macro-zone are turned off, and all the backlight sub-zones that have not been scanned are lit with the corresponding color and brightness value, and the method is as follows: the row direction macro-zone is scanned in the order of M1, M2, …, M e When the M1 row direction macro-zone is scanned, the backlight of M e , M1 row direction macro-zone is turned off, and the backlight of M2, …, M e-1 row direction macro-zone is turned on; when the M2 row direction macro-zone is scanned, the backlight of M1, M2 row direction macro-zone is turned off, and the backlight of M3, …, M e row direction macro-zone is turned on, and so on periodically; and T1 / T satisfies (M e +M1) / (M1+M2+M3+……+M e ), and T2 / T satisfies (M2+……+M e-1 )

[0056] / (M1+M2+M3+……+M e ).

[0057] In this embodiment, as shown in Figure 9 , it is a schematic diagram of the row macro-zone parallel scanning mode and the backlight macro-zone lighting of the present application.

[0058] In this embodiment, as shown in Figure 10As shown, the odd-even interleaved scanning method involves alternating scanning of large partitions in the row direction, either odd-then-even or even-then-odd. When a corresponding large partition in the row direction is scanned, all backlight sub-partitions within that large partition and the preceding large partition are turned off. All unscanned backlight sub-partitions are illuminated according to their corresponding color and brightness values. The method is as follows: Let e ​​be an even number. During line-by-line scanning, according to M1, M3, ..., M e-1 M2, M4, ..., M e The system sequentially scans the pixels of the large partitions in the row direction in turn. When it scans the pixel region corresponding to the large partition in the row direction M1, it turns off M1. e M1 row direction large zone backlight, simultaneously turn on M3, M5, ... M e-1 M2, M4, ..., M e-2 Large row-direction backlight; when scanning the M3 large row-direction partition, turn off the backlights of the M1 and M3 large row-direction partitions, and simultaneously turn on the backlights of M5, M7, ..., M... e-1 M2, M4, M6, ..., M e Large-area backlighting, repeating periodically; and, T1 / T satisfies (M e +M1) / (M1+M2+M3+……+M e T2 / T satisfies (M2 + ... + M) e-1 ) / (M1+M2+M3+……+M e ).

[0059] In this embodiment, as Figure 7 As shown, the horizontal backlight sub-segments employ a rolling data refresh and illumination method: Based on the response time T4 of the liquid crystal pixel molecules and the number of pixel rows l corresponding to a single backlight sub-segment, a backlight block containing m rows of backlight sub-segments is determined, and the light source within the backlight block should be turned off, where l > m. When scanning from the 1st row of backlight sub-segments to the mth row, the light sources of all m rows of backlight sub-segments are turned off and data refresh is completed. When scanning to the (m+1)th row of backlight sub-segments, the 1st row of backlight sub-segments is illuminated according to the refreshed data, while the light source of the (m+1)th row is turned off. When scanning to the (m+2)th row, the 2nd row of backlight sub-segments continues to be illuminated according to the refreshed data, while the light source of the (m+2)th row is turned off. This process is repeated periodically until the last row of backlight sub-segments is illuminated according to the refreshed brightness value, ultimately achieving the rolling refresh and illumination of the horizontal backlight sub-segments.

[0060] The following are specific implementation examples of the present invention.

[0061] This example illustrates a partition scanning method for a Mini-LED backlit LCD partition color adjustment system, including:

[0062] Step 1, as followsFigure 1 、 Figure 2 As shown in FIG. 2, a liquid crystal display with a resolution of 1920x1080 and a refresh rate of 240Hz is selected, and is divided into 4 row macro-partitions, each of which contains 576 sub-partitions, and a total of 2304 sub-partitions, and each sub-partition contains a three-color LED, and the base color on / off and brightness of each LED filament can be adjusted individually, and the LEDs in the same row direction are connected in series to the row scan lines line_1 to line_n of the chip, and each sub-partition corresponds to 30x30 pixels on the liquid crystal panel.

[0063] Step 2: The gray scale data of a frame of image of a display with a resolution of 1920x1080 and a refresh rate of 80Hz input from outside is separated according to RGB 3 single base color subframes, and the gray scale data values of the single color pixels corresponding to each sub-partition range of the backlight are obtained respectively, and then the single base color gray scale values corresponding to the lighting of the LED light points in each backlight sub-partition are determined by the method of weighted summation.

[0064] Step 3: According to the 3 subframe single base color gray scale data values of the backlight sub-partitions determined in step 2, the backlight sub-partitions are lit in the time sequence order of red, green and blue subframes respectively; according to the principle of time color mixing, three frames are combined to realize the modulation of different brightness and colors of the mini-led light source of each backlight sub-partition.

[0065] In step 3, the operation time sequence between the unlit backlight time T1, the backlight lighting maintenance time T2, the light source brightness data establishment and transmission time T3 and the response time T4 of the liquid crystal pixel molecules in a subframe time T. Taking the red subframe as an example, in the red subframe time T: first, the operations in T1 and T3 are performed simultaneously, then the operation in T4 is performed immediately after the end of T3, and the relationship T1≥T 3+ T4 is satisfied. Secondly, after T1, the operation in T2 is performed immediately, and the relationship T=T1+T2 is satisfied.

[0066] The above is the preferred embodiment of the present application, and any changes made according to the technical solutions of the present application, as long as the resulting functions do not exceed the scope of the technical solutions of the present application, are within the scope of protection of the present application.

Claims

1. A partition scanning method of a liquid crystal partition color modulation system based on a Mini-LED backlight, characterized in that, The backlight is divided into a plurality of row direction large partitions in a horizontal direction, each row direction large partition includes at least one backlight sub-partition, each backlight sub-partition is a rectangular backlight sub-partition of equal size, each backlight sub-partition corresponds to a plurality of pixel regions on the liquid crystal panel, and each backlight sub-partition includes a Mini-LED light source with adjustable brightness of three primary colors; the row direction large partitions adopt parallel, serial, odd-even partition or rolling scanning mode, and the row direction large partitions adopt line-by-line scanning; three single-color sub-frames are used to turn on the backlight in turn, and in each single-color sub-frame period, the backlight sub-partitions in the row direction large partition turn on the light source of the corresponding color according to the mapped backlight brightness value, and based on the time color mixing principle, the brightness and color information of the backlight sub-partitions are finally modulated. Step S1, determine the partition principle and the number of backlight sub-partitions and row direction large partitions; Step S2, split a frame of color image to be displayed into three single-color sub-frames of red, green and blue; Step S3, in the red sub-frame, turn on the red Mini-LED light source of the corresponding backlight sub-partition according to the timing requirement and mapping relationship; Step S4, in the green sub-frame, turn on the green Mini-LED light source of the corresponding backlight sub-partition according to the timing requirement and mapping relationship; Step S5, in the blue sub-frame, turn on the blue Mini-LED light source of the corresponding backlight sub-partition according to the timing requirement and mapping relationship; Step S6, periodically repeat steps S2 to S5; In step S1, the number of backlight sub-partitions is determined according to the number of I / O pins of the control chip of the Mini-LED light source, and the number of backlight sub-partitions in the row and column directions of the entire backlight module is L and H respectively, and L:H satisfies the display ratio relationship; The corresponding pixel relationship in the backlight sub-area is determined according to the selected display screen resolution size, the number of row pixels and column pixels is X and Y respectively, and X:Y satisfies the display proportion relationship; the backlight is divided into e row direction large partitions in the horizontal direction, and M i represents the ith row direction large partition, i is an integer and 1≤i≤e, and all backlight small partitions corresponding to the entire horizontal direction are included in the row direction large partition. The operation timing sequence between the unlit backlight time T1, the backlight lit maintaining time T2, the backlight sub-partition light source brightness data establishing and transmitting time T3, and the liquid crystal pixel molecule response time T4 within the single base color sub-frame time T; within the red, green or blue sub-frame time T: first, simultaneously execute the operation within T1 and T3 time, then execute the operation within T4 time immediately after the end of T3 time, and there is T1≥T 3+ T4 relationship; second, after T1 time, execute the operation within T2 time immediately, and satisfy T=T1+T2 relationship.

2. The partition scanning method of a liquid crystal partition color adjusting system based on a Mini-LED backlight according to claim 1, characterized in that, In step S2, the gray scale data of a frame of image is separated according to R / G / B three single-color sub-frames, and the gray scale data values of the single-color pixels corresponding to each backlight sub-partition in the backlight are obtained, and then the corresponding single-color brightness value of the LED light turning on in each backlight sub-partition is determined by the weighted summation method, and the mapping method is as follows: Wherein, N is the single base color gray scale value corresponding to the LED light point in the corresponding backlight sub-partition, N 11 to N ij is the gray scale data value of the single color pixel corresponding to the range of the corresponding backlight sub-partition, and the coefficient K ij ∈[0,1].

3. The method of claim 1, wherein the method is a method of subfield scanning for a liquid crystal subfield division color system based on a Mini-LED backlight. The specific implementation method of realizing the double modulation of brightness and color information in the backlight sub-partition is as follows: first, the corresponding primary color brightness data value of the light source of each backlight sub-partition is determined according to the function mapping relationship of the light source brightness data in the backlight sub-partition; then, the primary color light source of the backlight sub-partition is turned on as needed in the corresponding T2 time according to the order of red, green and blue three sub-frames; finally, according to the time color mixing principle, the three sub-frames are synthesized and the modulation of different brightness and color of the Mini-LED light source of each backlight sub-partition is finally realized.

4. The method of claim 1, wherein the method is a method of subfield scanning for a liquid crystal subfield division color system based on a Mini-LED backlight. The serial scanning mode is to sequentially scan each large partition in the row direction, and when a corresponding large partition in the row direction is scanned, all backlight sub-partitions of the corresponding large partition in the row direction and the previous large partition in the row direction are turned off, and all backlight sub-partitions that are not scanned are turned on with corresponding colors and brightness values. The method is as follows: large partitions in the row direction are sequentially and circularly scanned in the order of M1, M2, …, M e When the M1 large partition in the row direction is scanned, the backlight of the M e , M1 large partition in the row direction is turned off, and the backlight of the M2, …, M e-1 large partition in the row direction is turned on; when the M2 large partition in the row direction is scanned, the backlight of the M1, M2 large partition in the row direction is turned off, and the backlight of the M3, …, M e large partition in the row direction is turned on, and the cycle is repeated periodically; and T1 / T satisfies (M e +M1) / (M1+M2+M3+…+M e ), and T2 / T satisfies (M2+…+M e-1 ) / (M1+M2+M3+…+M e ).

5. The method of claim 1, wherein the method is a method of subfield scanning for a liquid crystal subfield division color system based on a Mini-LED backlight. The odd-even partition scanning mode is that odd-even order is used to scan the large partitions in row direction, and first odd then even or first even then odd is used to scan the large partitions in row direction; and when a corresponding large partition in row direction is scanned, all backlight sub-partitions in the corresponding large partition in row direction and the previous large partition in row direction are turned off, and all backlight sub-partitions not scanned are turned on with corresponding color and brightness value, and the method is as follows: let e be even, when scanning line by line, large partition pixel points in row direction are scanned in the order of M1, M3, …, M e-1 , M2, M4, …, M e , and when the pixel area corresponding to M1 large partition in row direction is scanned, M e , M1 large partition backlight in row direction is turned off, and M3, M5, …, M e-1 , M2, M4, …, M e-2 large partition backlight in row direction is turned on; when M3 large partition in row direction is scanned, M1, M3 large partition backlight in row direction is turned off, and M5, M7, …, M e-1 , M2, M4, M6, …, M e large partition backlight in row direction is turned on, and the periodic repetition is performed; and T1 / T satisfies (M e +M1) / (M1+M2+M3+…+M e ), and T2 / T satisfies (M2+…+M e-1 ) / (M1+M2+M3+…+M e ).

6. The method of claim 1, wherein the method is a method of subfield scanning for a liquid crystal subfield division color adjustment system based on a Mini-LED backlight. The horizontal backlight sub-partition adopts a rolling data refreshing and lighting method: through the response time T4 of the liquid crystal pixel molecule and the number of pixel rows l corresponding to a single backlight sub-partition, a backlight block of the backlight sub-partition containing m rows is determined, and the light source in the backlight block should be turned off, l>m; when scanning from the first row of backlight sub-partitions to the mth row of backlight sub-partitions, the light sources of the m rows of backlight sub-partitions are all turned off and the data refreshing is completed; when scanning to the m+1th row of backlight sub-partitions, the first row of backlight sub-partitions is lit according to the refreshed data, and the light source of the m+1th row of backlight sub-partitions is turned off; When scanning to the m+2th row, the second row of backlight sub-partitions is continuously lit according to the refreshed data, and the light source of the m+2th row of backlight sub-partitions is turned off; Periodically executed until the last row of backlight sub-partitions is lit according to the refreshed brightness value, finally realizing the rolling refreshing and lighting of the horizontal backlight sub-partition.

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