How to adjust the brightness uniformity of miniLED

Abstract

The present invention is used in the field of LED display technology, and specifically discloses a method for adjusting the brightness uniformity of miniLED, including the following steps: Step 1: Generate a full-area brightness adjustment coefficient C using a single-area diffusion coefficient A and a full-area brightness partition gradient B; Step 2: Feedback test the full-area brightness partition gradient B using the full-area brightness adjustment coefficient C, and adjust the full-area brightness adjustment coefficient C through the feedback test. The method for adjusting the brightness uniformity of miniLED, without increasing the hardware cost, uses a software algorithm to quickly adjust and further optimize the brightness of the partitions in the miniLED peripheral area, quickly improve the brightness uniformity index of the miniLED display unit in a software manner, and use a software algorithm to adjust the brightness of the miniLED. This can be combined with existing physical methods or used independently, and brightness adjustment is achieved using a software algorithm.

Description

Technical Field

[0001] The present invention relates to the field of LED display technology, and in particular to a method for adjusting the brightness uniformity of a miniLED. Background Art

[0002] MiniLED refers to LED chips with a size of 100μm. Compared with traditional LEDs, these chips are smaller and denser. A typical miniLED backlight module may contain thousands or even more miniLED chips. MiniLED direct backlight is the basic hardware unit of Local Dimming brightness control. It is composed of matrix LEDs, and the brightness of each partition is controlled by LED driver chips. LED driver chips are usually divided into PM drive (Passive Matrix) and AM drive (Active Matrix). The two drive modes are suitable for different usage scenarios.

[0003] However, no matter which control method is used, the partition brightness of the direct backlight is composed of the LED light in this partition and the fill light of the surrounding LEDs. This causes the brightness value of the entire backlight area to gradually decrease from the middle to the periphery in normal mode. The brightness difference in the four corners of the rectangle is particularly obvious. The current solution to the brightness difference is mainly physical. For example, physical partition isolation: dam glue, reflective cover matrix, (MLAs) microstructure prism imprinted film, the partition light energy is locked as much as possible in the partition, reducing the impact between partitions, but the disadvantage of this solution is that the cost is high and it cannot completely isolate the light energy dispersion between partitions, or use closed reflective edges, secondary gradient conversion films and other measures to recycle and reprocess the peripheral dissipated light energy, reduce the partition light energy loss in the edge area, and thus improve the peripheral brightness, but the disadvantage of this solution is that it has high requirements on materials, processes, and structures, and the cost is high, and the improvement effect is weak. Summary of the invention

[0004] The purpose of the present invention is to provide a method for adjusting the brightness uniformity of miniLEDs to solve the problem of high cost and weak improvement effect in dealing with miniLED brightness differences using traditional physical partitioning separation methods and light energy recovery solutions proposed in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a method for adjusting the brightness uniformity of miniLED, comprising the following steps: step 1: using a single-region diffusion coefficient A and a full-region brightness partition gradient B to generate a full-region brightness adjustment coefficient C; step 2: performing a feedback test on the full-region brightness partition gradient B through the full-region brightness adjustment coefficient C, and adjusting the full-region brightness adjustment coefficient C through the feedback test; step 3: using the generated full-region brightness adjustment coefficient C to fine-tune the adjustment coefficient retrieval table D; step 4: using the original video data E and referencing the data sources of the partition backlight calculation F and the partition backlight raw data G related to the existing miniLED system, performing secondary processing for the calculation of the partition backlight calibration data H; step 5: calculating the partition backlight calibration data H according to the generated adjustment coefficient retrieval table D and the partition backlight raw data G, and using the generated partition backlight calibration data H to improve the uniformity of the brightness of the miniLED display unit;

[0006] Preferably, the single partition diffusion coefficient A in step one is obtained by a brightness meter tested according to a standard partition spacing, the basic brightness calculated by the brightness meter is recorded as X (nit), the corresponding single partition diffusion coefficient A is 0.01X, and the full-area brightness partition gradient B is obtained by a brightness meter tested according to a standard partition spacing.

[0007] By adopting the above technical solution, the diffusion coefficient A of a single partition can be calculated using the basic brightness tested, and the brightness partition gradient B of the entire area can be tested using a brightness meter.

[0008] Preferably, the partition of the full-area brightness adjustment coefficient C is divided into an outer frame partition and other partitions, the outer frame partition is composed of four corners and a border, the corners of the outer frame partition are marked as Ac, the borders of the outer frame partition are marked as Ab, and the other partitions are areas outside the outer frame partition range in all partitions, and the full-area brightness adjustment coefficients C of the other partitions are all set to 1, and the full-area brightness adjustment coefficients C of the outer frame partition are accumulated according to the lack of fill light.

[0009] By adopting the above technical solution, by partitioning the brightness adjustment coefficient C of the entire area and accumulating the basic brightness, the adjustment coefficient search table D can be calculated.

[0010] Preferably, the calculation method of the full-area brightness adjustment coefficient C of the corner Ac in the outer frame partition is as follows: with Ac as the center, the initial partition is padded to form a nine-square grid with Ac as the center, and the initial basic brightness at Ac and the basic brightness of the padded part are added to obtain a new basic brightness value, and the calculated basic brightness value replaces the basic brightness value at Ac in the original corner. Similarly, the calculation method of the full-area brightness adjustment coefficient C of the border Ab in the outer frame partition is as follows: with Ab as the center, the initial partition is padded to form a nine-square grid with Ab as the center, and the initial basic brightness at Ab and the basic brightness of the padded part are added to obtain a new basic brightness value, and the calculated basic brightness value replaces the basic brightness value at Ab in the original corner. The adjustment coefficient retrieval table D is the result of fine-tuning the value after introducing the full-area brightness adjustment coefficient C.

[0011] By adopting the above technical solution and utilizing the fill light fine-tuning of the Ac and Ab partitions, a revised calibration coefficient search table D can be obtained.

[0012] Preferably, the calculation method of the partition backlight calibration data H in step 5 is as follows: for the calibration coefficient search table D, D1-1 is marked as the coefficient of the 1st row and the 1st column, D2-3 is marked as the coefficient of the 2nd row and the 3rd column, and so on, Dy-x is marked as the coefficient of the yth row and the xth column of the calibration coefficient search table D;

[0013] For the partitioned backlight raw data G, G1-1 represents the raw data of the first row and the first column, G2-3 represents the raw data of the second row and the third column, and so on, Gy-x represents the raw data of the yth row and the xth column of the partitioned backlight raw data G;

[0014] For the partition backlight calibration data H, H1-1 represents the calibration result of the 1st row and the 1st column, H2-3 represents the calibration result of the 2nd row and the 3rd column, and so on, Hy-x represents the calibration result of the yth row and the xth column of the partition backlight calibration data H;

[0015] According to the above marks, the calculation formula of the partition backlight calibration data H is as follows:

[0016] Hy-x=Dy-x*Gy-x.

[0017] By adopting the above technical solution, the partition backlight calibration data H can be calculated using the adjustment coefficient retrieval table D and the partition backlight original data G, so as to uniformly adjust the brightness of the miniLED.

[0018] Compared with the prior art, the beneficial effects of the present invention are: the method for adjusting the brightness uniformity of the miniLED is:

[0019] 1. In the present invention, without increasing the hardware cost, the brightness of the partitions around the miniLED is quickly adjusted and further optimized by software algorithm, and the brightness uniformity index of the miniLED display unit is quickly improved by software. The brightness of the miniLED is adjusted by software algorithm, which can be combined with the existing physical method or used independently. The brightness adjustment is achieved by software algorithm, and there are no additional requirements for materials, processes, and structures. While ensuring the brightness improvement effect, the use cost is reduced;

[0020] 2. Based on the test results of the diffusion coefficient A of a single partition, the present invention can simplify the calculation model, thereby realizing a cycle of testing, table building, retesting and coefficient correction. This process achieves the goal of adjusting the uniformity of the global brightness by calculating and adjusting the global brightness adjustment coefficient C without modifying the existing hardware;

[0021] 3. The brightness adjustment solution based on software algorithm in the present invention has strong device compatibility. No matter it is a miniLED display screen of different models or a different display device, as long as it has the corresponding software and hardware foundation, the same algorithm principle can be applied for brightness adjustment, which greatly simplifies the transplantation and adaptation of brightness adjustment technology between different devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the process structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure corresponding to the diffusion coefficient A of a single partition and the basic brightness of the present invention;

[0024] Figure 3 This is a schematic diagram of the partition structure of the full-area brightness adjustment coefficient C of the present invention;

[0025] Figure 4 This is a schematic diagram of the Ac partition brightness basic value fill light structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the basic value fill light structure of the Ab partition brightness of the present invention;

[0027] Figure 6 Schematic diagram of the fine-tuning structure of the calibration coefficient retrieval table D of the present invention. DETAILED DESCRIPTION

[0028] 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.

[0029] See also Figure 1-Figure 6 , the present invention provides a technical solution: a method for adjusting the brightness uniformity of miniLED.

[0030] The method comprises the following steps: step 1: using a single-region diffusion coefficient A and a full-region brightness partition gradient B to generate a full-region brightness adjustment coefficient C; step 2: performing a feedback test on the full-region brightness partition gradient B through the full-region brightness adjustment coefficient C, and adjusting the full-region brightness adjustment coefficient C through the feedback test; step 3: using the generated full-region brightness adjustment coefficient C to fine-tune and obtain an adjustment coefficient retrieval table D; step 4: using the original video data E and referencing the data sources of the partition backlight calculation F and the partition backlight raw data G related to the existing miniLED system, performing secondary processing for calculating the partition backlight calibration data H; step 5: calculating the partition backlight calibration data H based on the generated adjustment coefficient retrieval table D and the partition backlight raw data G, and using the generated partition backlight calibration data H to improve the uniformity of the brightness of the miniLED display unit;

[0031] like Figure 1 As shown, a luminance meter is used to test and obtain the basic brightness of the miniLED partition, and the basic brightness obtained from the test is used to calculate the diffusion coefficient A of a single partition. The luminance meter can be used to test and obtain the brightness partition gradient B of the entire area. The single partition diffusion coefficient A and the brightness partition gradient B of the entire area can be used to generate the brightness adjustment coefficient C of the entire area. The generated brightness adjustment coefficient C of the entire area is fed back to the brightness partition gradient B of the entire area, and the fine-tuned brightness partition gradient B of the entire area is fed back to adjust the brightness adjustment coefficient C of the entire area. The generated brightness adjustment coefficient C of the entire area is fine-tuned using a certain method, and the adjustment coefficient retrieval table D can be obtained. The partition backlight operation F and the partition backlight raw data G related to the existing miniLED system are referenced as data sources, and the referenced data source is secondary processed to obtain the partition backlight raw data G. The partition backlight calibration data H is calculated using the adjustment coefficient retrieval table D and the partition backlight raw data G. The generated partition backlight calibration data H can improve the uniformity of the brightness of the miniLED display unit.

[0032] In step 1, the single partition diffusion coefficient A is obtained by the brightness meter according to the standard partition spacing test. The basic brightness calculated by the brightness meter is recorded as X (nit), and the corresponding single partition diffusion coefficient A is 0.01X. The full-area brightness partition gradient B is obtained by the brightness meter according to the standard partition spacing test. The full-area brightness adjustment coefficient C is divided into the outer frame partition and the remaining partitions. The outer frame partition consists of four corners and a border. The corners of the outer frame partition are marked as Ac, and the border of the outer frame partition is marked as Ab. The remaining partitions are the areas outside the outer frame partition range in all partitions. The full-area brightness adjustment coefficients C of the remaining partitions are all set The full-area brightness adjustment coefficient C of the outer frame partition is 1, and the partition brightness is accumulated according to the lack of fill light. The full-area brightness adjustment coefficient C of the corner Ac in the outer frame partition is calculated as follows: With Ac as the center, the initial partition is filled to form a nine-square grid with Ac as the center, and the initial basic brightness at Ac is accumulated with the basic brightness of the filled part to obtain a new basic brightness value, and the calculated basic brightness value replaces the original basic brightness value at Ac in the corner. Similarly, the full-area brightness adjustment coefficient C of the border Ab in the outer frame partition is calculated as follows: With Ab as the center, the initial partition is filled to form a nine-square grid with Ac as the center. A nine-square grid with Ab as the center is formed, and the initial basic brightness at Ab and the basic brightness of the filled part are accumulated to obtain a new basic brightness value, and the calculated basic brightness value replaces the basic brightness value at Ab in the original corner. The adjustment coefficient retrieval table D is the result of fine-tuning the value after introducing the full-area brightness adjustment coefficient C. The calculation method of the partition backlight calibration data H in step 5 is as follows: for the adjustment coefficient retrieval table D, D1-1 is marked as the coefficient of the 1st row and the 1st column, D2-3 represents the coefficient of the 2nd row and the 3rd column, and so on, Dy-x represents the coefficient of the yth row and the xth column of the adjustment coefficient retrieval table D; For the partitioned backlight original data G, G1-1 represents the original data of the 1st row and the 1st column, G2-3 represents the original data of the 2nd row and the 3rd column, and so on, Gy-x represents the original data of the yth row and the xth column of the partitioned backlight original data G; for the partitioned backlight calibration data H, H1-1 represents the calibration result of the 1st row and the 1st column, H2-3 represents the calibration result of the 2nd row and the 3rd column, and so on, Hy-x represents the calibration result of the yth row and the xth column of the partitioned backlight calibration data H; according to the above markings, the calculation formula of the partitioned backlight calibration data H is as follows: Hy-x=Dy-x*Gy-x;

[0033] like Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown in the figure, in the process of adjusting the brightness of the display unit of miniLED by the software algorithm, the basic brightness of each partition of miniLED is measured by the brightness meter and recorded as X (nit), then the single partition diffusion coefficient A of the corresponding partition is 0.01X, and the full-area brightness partition gradient B is obtained by the brightness meter test, and all the partition brightness data need to be tested, and the display partition of miniLED is divided into the outer frame partition and the remaining partitions. The full-area brightness adjustment coefficient C of the remaining partitions is set to 1, and the partition brightness is accumulated for the outer frame partition according to the lack of fill light. The Ac area located in the corner of the outer frame partition is as follows Figure 4 As shown in the figure, the dotted box is the fill light area, then the initial basic brightness at Ac is accumulated with the basic brightness of the fill part to obtain a new basic brightness value, and the calculated basic brightness value replaces the original basic brightness value at Ac in the corner, that is, Ac basic brightness value = 1.0 + 0.125 + 0.2 + 0.125 + 0.2 + 0.125 = 1.775, replacing the original basic brightness value of 1.0 at the center. Similarly, the initial basic brightness at Ab is calculated as follows Figure 5 As shown, Ab1.0+0.125+0.2+0.125=1.45 replaces the original basic brightness value of 1.0 at the center. The calculated brightness value is combined with the full-area brightness adjustment coefficient C to obtain the fine-tuned adjustment coefficient retrieval table D. The partition backlight operation F and the partition backlight raw data G are both referenced by existing miniLED system-related data sources. For the adjustment coefficient retrieval table D, Dyx represents the coefficient of the yth row and xth column of the adjustment coefficient retrieval table D; for the partition backlight raw data G, Gy-x represents the raw data of the yth row and xth column of the partition backlight raw data G; for the partition backlight calibration data H, Hy-x represents the calibration result of the yth row and xth column of the partition backlight calibration data H, and the relevant data is brought into Hy-x=Dy-x*Gy-x for calculation to obtain the partition backlight calibration data H, and the generated partition backlight calibration data H is used to uniformly adjust the brightness of the miniLED.

[0034] Working principle: The full-area brightness adjustment coefficient C is generated by using the single-area diffusion coefficient A and the full-area brightness partition gradient B, and the full-area brightness adjustment coefficient C is adjusted by feedback testing the full-area brightness partition gradient B. Based on the test results of the single-area diffusion coefficient A, the calculation model can be simplified to achieve a cyclic process of testing, table building, retesting and coefficient correction. This process achieves the goal of adjusting the global brightness uniformity by calculating and adjusting the full-area brightness adjustment coefficient C without modifying the existing hardware, and uses the full-area brightness adjustment coefficient C to fine-tune the adjustment coefficient retrieval table D, and calculates the partition backlight of each miniLED partition in conjunction with the partition backlight raw data G. Light calibration data H, using the calculated partition backlight calibration data H, without increasing hardware costs, the brightness of the partitions in the miniLED peripheral area is quickly adjusted and further optimized in a software algorithm, thereby quickly improving the brightness uniformity of the miniLED display unit. The software algorithm can be used independently, and can be used in conjunction with existing physical partition isolation and other methods to uniformly adjust the brightness of the miniLED, thereby ensuring the brightness improvement effect while reducing the cost of use. The method of using software algorithms to adjust brightness is also compatible between devices, and can use the same algorithm principle to adjust brightness between different miniLED display devices.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for adjusting the brightness uniformity of miniLED, characterized by: The following steps are involved: Step 1: Generate the full-area brightness adjustment coefficient C using the single-area diffusion coefficient A and the full-area brightness partition gradient B; Step 2: Perform feedback test on the full-area brightness partition gradient B through the full-area brightness adjustment coefficient C, and adjust the full-area brightness adjustment coefficient C through the feedback test; Step 3: Use the generated full-area brightness adjustment coefficient C to fine-tune and obtain the adjustment coefficient search table D; Step 4: Utilize the original video data E and reference the data sources of the sub-area backlight calculation F and sub-area backlight original data G related to the existing miniLED system, and perform secondary processing for the calculation of the sub-area backlight calibration data H; Step 5: Calculate the partition backlight calibration data H based on the generated adjustment coefficient retrieval table D and the partition backlight original data G, and use the generated partition backlight calibration data H to improve the uniformity of the brightness of the miniLED display unit; The partition of the full-area brightness adjustment coefficient C is divided into an outer frame partition and other partitions, the outer frame partition is composed of four corners and a border, the corner of the outer frame partition is marked as Ac, the border of the outer frame partition is marked as Ab, and the other partitions are the areas outside the outer frame partition range in all partitions. The full-area brightness adjustment coefficient C of the other partitions is set to 1. The full-area brightness adjustment coefficient C of the outer frame partition is accumulated according to the lack of fill light. The full-area brightness adjustment coefficient C of the corner Ac in the outer frame partition is calculated as follows: With Ac as the center, the initial partition is filled to form a nine-square grid with Ac as the center. The initial basic brightness at Ac and the basic brightness of the padded part are added to obtain a new basic brightness value, and the calculated basic brightness value replaces the basic brightness value at Ac in the original corner. Similarly, the calculation method of the full-area brightness adjustment coefficient C of the border Ab in the outer frame partition is as follows: with Ab as the center, the initial partition is padded to form a nine-square grid with Ab as the center, and the initial basic brightness at Ab and the basic brightness of the padded part are added to obtain a new basic brightness value, and the calculated basic brightness value replaces the basic brightness value at Ab in the original corner. The adjustment coefficient retrieval table D is the result of fine-tuning the value after introducing the full-area brightness adjustment coefficient C.

2. The method for adjusting the brightness uniformity of miniLED according to claim 1, characterized in that: The single partition diffusion coefficient A in step one is obtained by a brightness meter according to a standard partition spacing test, the basic brightness calculated by the brightness meter is recorded as X (nit), the corresponding single partition diffusion coefficient A is 0.01X, and the full-area brightness partition gradient B is obtained by a brightness meter according to a standard partition spacing test.

3. The method for adjusting the brightness uniformity of miniLED according to claim 1, characterized in that: The calculation method of the partition backlight calibration data H in step 5 is as follows: for the adjustment coefficient search table D, D1-1 is marked as the coefficient of the first row and the first column, D2-3 is marked as the coefficient of the second row and the third column, and so on, Dy-x is marked as the coefficient of the yth row and the xth column of the adjustment coefficient search table D; For the partitioned backlight raw data G, G1-1 represents the raw data of the first row and the first column, G2-3 represents the raw data of the second row and the third column, and so on, Gy-x represents the raw data of the yth row and the xth column of the partitioned backlight raw data G; For the partition backlight calibration data H, H1-1 represents the calibration result of the 1st row and the 1st column, H2-3 represents the calibration result of the 2nd row and the 3rd column, and so on, Hy-x represents the calibration result of the yth row and the xth column of the partition backlight calibration data H; According to the above marks, the calculation formula of the partition backlight calibration data H is as follows: Hy-x=Dy-x*Gy-x.

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