Display correction method of LED display screen and related device thereof

Abstract

This disclosure provides a display calibration method and related apparatus for an LED display screen. The display calibration method includes: establishing a calibration matrix for the LED display screen; and calibrating the display data based on the brightness correction coefficients and chromaticity correction coefficients in the calibration matrix. Establishing the calibration matrix for the LED display screen includes: obtaining the initial brightness and initial chromaticity of the RGB three primary colors in a display unit when they are each grayscale level; obtaining multiple sets of actual brightness and actual chromaticity when controlling the display of at least one column of grayscale levels to change when displaying a specific grayscale level in the display unit; obtaining multiple brightness correction coefficients representing each specific grayscale level under different coupling scenarios based on a brightness deviation threshold, multiple actual brightness levels, and initial brightness; and obtaining multiple chromaticity correction coefficients representing each specific grayscale level under different coupling scenarios based on a chromaticity deviation threshold, multiple actual chromaticity levels, and initial chromaticity. This disclosure can adaptively calibrate different display content to improve the display effect of the display screen.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and specifically to a display calibration method and related apparatus for an LED display screen. Background Technology

[0002] With the rapid development of LED display technology, LED displays have been widely used in advertising, television, stage performances, sporting events, and public information displays due to their advantages such as high brightness, long lifespan, and low power consumption. Currently, LED displays are developing towards ultra-high definition, high brightness, low power consumption, and long lifespan; however, the impact of temperature changes on the brightness, color, and uniformity of the display is becoming increasingly prominent. To ensure display quality, existing technologies employ various correction methods, including low grayscale correction, high grayscale correction, full grayscale correction, temperature compensation, and aging compensation. These solutions can optimize the display to some extent based on ambient brightness and temperature by adjusting the uniformity of the screen's monochrome and color transitions, but none of them fully consider the suppression of image coupling effects caused by the displayed content.

[0003] In practical applications, LED displays typically employ a line scanning drive method. In this method, the line scanning circuit activates pixel rows sequentially, driving a certain number of LED beads per row. When there is a significant difference in brightness between different LED beads within the same row, such as... Figure 1 As shown, for example, if some areas display low grayscale images while adjacent areas display pure black or pure white content, the low grayscale areas will be affected by coupling interference from the high contrast areas, causing a shift in brightness and color. This phenomenon is called the high-contrast coupling effect, which is especially noticeable in the low grayscale state of small-pitch LED displays, severely affecting display uniformity and image quality.

[0004] In existing technologies, high-contrast coupling issues are primarily mitigated by adjusting driver chip parameters. However, since different grayscale combinations result in varying degrees of coupling, and chip parameter settings are relatively fixed, it is difficult to achieve precise compensation for dynamically changing display content. This single-parameter correction method cannot adapt to complex and ever-changing real-world display scenarios, especially when displaying high dynamic range content, where the correction effect is limited.

[0005] Therefore, there is an urgent need for a display calibration method and related devices for LED displays that can adaptively correct different display content. Summary of the Invention

[0006] To address the aforementioned technical problems, this disclosure provides a display calibration method and related apparatus for an LED display screen that can adaptively calibrate different display contents.

[0007] According to a first aspect of this disclosure, a display calibration method for an LED display screen is provided, comprising:

[0008] Establish a calibration matrix for the LED display screen, which includes multiple brightness correction coefficients and multiple chromaticity correction coefficients;

[0009] The display data is corrected based on the luminance correction coefficients and chrominance correction coefficients in the correction matrix.

[0010] The establishment of the calibration matrix for the LED display screen includes:

[0011] The initial brightness and initial chromaticity of the RGB three primary colors in a display unit are obtained when they are each gray level. The LED display screen is divided into multiple display units, and each display unit includes m×n pixels, where m and n are positive integers.

[0012] When a specific grayscale is displayed in the display unit, multiple sets of actual brightness and actual chromaticity are obtained and the grayscale display of at least one column is controlled to be changed.

[0013] Based on the luminance deviation threshold, multiple actual luminances, and initial luminance, multiple luminance correction coefficients representing each specific gray level under different coupling scenarios are obtained; and based on the chrominance deviation threshold, multiple actual chrominances, and initial chrominance, multiple chrominance correction coefficients representing each specific gray level under different coupling scenarios are obtained.

[0014] Optionally, obtaining the initial brightness and initial chromaticity of the RGB three primary colors within a display unit when they are each grayscale level includes:

[0015] Control the display of gray levels 0 to 255 for each primary color within the display unit; and

[0016] The initial luminance and initial chromaticity are obtained by measuring and displaying the luminance and chromaticity values ​​at different gray levels for each primary color.

[0017] Optionally, when a specific grayscale is displayed in the display unit, controlling the change of the grayscale display of at least one column includes obtaining multiple sets of actual brightness and actual chromaticity.

[0018] When the first primary color and first grayscale are displayed in the display unit, at least one column in the display unit is controlled to display different grayscales, and the corresponding actual brightness and actual chromaticity are measured.

[0019] When displaying other gray levels of the first primary color in the display unit, at least one column in the display unit is controlled to display different gray levels, and the corresponding actual brightness and actual chromaticity are measured.

[0020] When displaying grayscale levels 1-255 of the second primary color within the display unit, at least one column in the display unit is controlled to display different grayscale levels, and the corresponding actual brightness and actual chromaticity are measured; and

[0021] When displaying grayscale levels 1-255 of the third primary color in the display unit, at least one column in the display unit is controlled to display different grayscale levels, and the corresponding actual brightness and actual chromaticity are measured.

[0022] Optionally, controlling at least one column in the display unit to display different gray levels includes controlling column 1 to column i in the display unit to display different gray levels, where i is an integer, and 1 <i≤ .

[0023] Optionally, controlling at least one column in the display unit to display different gray levels includes: controlling at least one column in the display unit to display other gray levels of the same primary color, or controlling at least one column in the display unit to display 0-255 gray levels of different primary colors.

[0024] Optionally, multiple brightness correction coefficients representing each specific grayscale level under different coupled scenarios are obtained based on the brightness deviation threshold, multiple actual brightness levels, and the initial brightness, including:

[0025] Calculate the brightness deviation between the initial brightness and multiple actual brightness levels at each specific gray level;

[0026] When the brightness deviation is greater than the brightness deviation threshold, the brightness correction coefficient is determined based on the ratio of the corresponding initial brightness to the actual brightness.

[0027] Optionally, the multiple chromaticity correction coefficients, which characterize each specific gray level under different coupled scenarios, are obtained based on the chromaticity deviation threshold, multiple actual chromaticities, and the initial chromaticity, including:

[0028] Calculate the chromaticity deviation between the initial chromaticity and multiple actual chromaticities at each specific gray level;

[0029] When the chromaticity deviation is greater than the chromaticity deviation threshold, the chromaticity correction coefficient is determined based on the ratio of the corresponding initial chromaticity to the actual chromaticity.

[0030] Optionally, correcting the data to be displayed includes: comparing the data to be displayed in each display unit with a grayscale threshold; and when the data to be displayed in the display unit simultaneously has grayscale levels lower than a first grayscale threshold and higher than a second grayscale threshold, correcting the data to be displayed in the display unit based on the luminance correction coefficient and chrominance correction coefficient in the correction matrix.

[0031] Optionally, establishing the calibration matrix for the LED display screen further includes: adjusting the LED display screen to its initial state before acquiring the initial brightness and initial chromaticity.

[0032] Optionally, the correction matrix is ​​a multi-dimensional matrix, which includes the luminance correction coefficient and chromaticity correction coefficient of the RGB three primary colors under different grayscale combinations.

[0033] Optionally, establishing the calibration matrix for the LED display screen also includes: for LED displays screens with different display unit structures, establishing a calibration matrix corresponding to each display unit.

[0034] According to a second aspect of this disclosure, a display calibration device for an LED display screen is provided, comprising: a calibration matrix establishment module for establishing a calibration matrix including multiple luminance correction coefficients and multiple chromaticity correction coefficients;

[0035] The display correction module is used to correct the display data based on the luminance correction coefficients and chrominance correction coefficients in the correction matrix.

[0036] The correction matrix establishment module includes:

[0037] An initial parameter acquisition unit is used to acquire the initial brightness and initial chromaticity of each gray level of the RGB three primary color positions within a display unit. The LED display screen is divided into multiple display units, and each display unit includes m×n pixels, where m and n are positive integers.

[0038] The actual parameter acquisition unit is used to acquire multiple sets of actual brightness and actual chromaticity when at least one column of grayscale is changed when displaying a specific grayscale in the display unit.

[0039] The correction coefficient calculation unit obtains multiple brightness correction coefficients representing each specific gray level under different coupling scenarios based on the brightness deviation threshold, multiple actual brightness, and initial brightness, and obtains multiple chromaticity correction coefficients representing each specific gray level under different coupling scenarios based on the chromaticity deviation threshold, multiple actual chromaticity, and initial chromaticity.

[0040] Optionally, the actual parameter acquisition unit is configured to control and change the grayscale display of one column to no more than half of the columns when displaying different colors and grayscale levels in the display unit, and measure the corresponding actual brightness value and actual chromaticity value.

[0041] According to a third aspect of this disclosure, an LED display screen is provided, including the display calibration device described above.

[0042] According to a fourth aspect of this disclosure, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the display correction method as described above.

[0043] According to a fifth aspect of this disclosure, a chip is provided for performing the display correction method described above.

[0044] The beneficial effects of this disclosure are:

[0045] The LED display calibration method disclosed herein effectively solves the coupling phenomenon caused by differences in displayed content in LED displays by establishing a calibration matrix containing multi-dimensional brightness and color correction coefficients. Furthermore, this disclosure systematically acquires actual display parameters under different grayscale combinations and dynamically generates calibration coefficients based on a preset deviation threshold, enabling the display to maintain accuracy in brightness and color even in high-contrast scene scenarios. This calibration method addresses the root cause of coupling and has significant advantages over traditional fixed-parameter calibration methods.

[0046] Furthermore, the display calibration method disclosed herein optimizes data processing by setting grayscale thresholds. The system only initiates the corresponding calibration procedure when grayscale levels below a first grayscale threshold and above a second grayscale threshold exist simultaneously within the display unit. This ensures calibration accuracy in critical scenarios while avoiding unnecessary computational resource consumption. This intelligent threshold triggering mechanism is particularly suitable for optimizing the display of small-pitch LED displays in low-grayscale conditions, effectively improving the poor calibration performance of traditional methods for complex display content. Attached Figure Description

[0047] The above and other objects, features and advantages of this disclosure will become clearer from the following description of embodiments of this disclosure with reference to the accompanying drawings.

[0048] Figure 1 A schematic diagram showing the phenomenon of high contrast coupling in an LED display screen;

[0049] Figure 2 A schematic flowchart of a display correction method according to an embodiment of this application is shown;

[0050] Figure 3 A flowchart illustrating another display correction method provided according to an embodiment of this application is shown;

[0051] Figure 4 A flowchart illustrating step S110 of the display correction method provided according to an embodiment of this application is shown.

[0052] Figure 5 A flowchart illustrating step S120 of the display correction method provided according to an embodiment of this application is shown.

[0053] Figure 6 This diagram illustrates a grayscale combination in a display correction method according to an embodiment of this application.

[0054] Figure 7 A flowchart illustrating step S130 of the display correction method provided according to an embodiment of this application is shown.

[0055] Figure 8 A schematic diagram of the structure of a display calibration device for an LED display screen provided according to an embodiment of this application is shown. Detailed Implementation

[0056] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application may be implemented in various forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0057] To help those skilled in the art better understand this application, the application scenarios and design concepts involved in this application will be briefly introduced below.

[0058] Figure 2 This diagram illustrates a flow chart of a display correction method according to an embodiment of this application. Figure 3 A schematic flowchart of another display correction method provided according to an embodiment of this application is shown. Figure 4 This diagram illustrates a flow chart of step S110 in the display correction method provided according to an embodiment of this application. Figure 5 This diagram illustrates a flow chart of step S120 in the display correction method provided according to an embodiment of this application. Figure 6 This diagram illustrates a grayscale combination in a display correction method provided according to an embodiment of this application. Figure 7 This diagram illustrates a flow chart of step S130 in the display correction method provided according to an embodiment of this application.

[0059] like Figure 2 As shown, the display calibration method provided in this application includes the following steps:

[0060] A calibration matrix for the LED display screen is established, comprising multiple brightness correction coefficients and multiple chromaticity correction coefficients. For example, the calibration matrix is ​​a multi-dimensional matrix containing brightness and chromaticity correction coefficients for the RGB primary colors under different grayscale combinations. Further, establishing the calibration matrix for the LED display screen includes the following steps:

[0061] Step S110: Obtain the initial brightness and initial chromaticity of the RGB three primary colors in a display unit when they are each grayscale level. Further, the LED display screen is divided into multiple display units, each containing m×n pixels, where m and n are positive integers. For example, the LED display screen may contain a×b pixels, where 1 ≤ m ≤ a. <n≤b。

[0062] For example, combined Figure 4 As shown, step S110 includes the following steps:

[0063] Step S111: Control the display of gray levels 0 to 255 for each primary color within the display unit. Further, select one display unit in the LED display screen, and control each row of pixels in that display unit to display different gray levels of different primary colors through the row driving circuit and column driving circuit in the display driving circuit. Specifically, the row driving circuit selects the pixel rows in the display unit row by row, and the column driving circuit controls the brightness output of each column of pixels according to preset gray level data, thereby sequentially displaying each gray level from 0 to 255 for the red, green, and blue primary colors in the display unit.

[0064] Step S112: Measure the luminance and chromaticity values ​​of each primary color at different gray levels to obtain initial luminance and initial chromaticity. Further, using optical measurement equipment such as a luminance meter and a colorimeter, measure each primary color gray level displayed in the display unit under standard observation conditions, and record the corresponding luminance values ​​L(rx), L(gx), L(bx) and chromaticity values ​​C(rx), C(gx), C(bx), where L(rx) represents the initial luminance of the display unit when displaying the red primary color gray level x, L(gx) represents the initial luminance of the display unit when displaying the green primary color gray level x, L(bx) represents the initial luminance of the display unit when displaying the blue primary color gray level x, C(rx) represents the initial chromaticity of the display unit when displaying the red primary color gray level x, C(gx) represents the initial chromaticity of the display unit when displaying the green primary color gray level x, and C(bx) represents the initial chromaticity of the display unit when displaying the blue primary color gray level x. x represents a gray level value from 0 to 255. These measured values ​​serve as the initial reference parameters for subsequent calibration.

[0065] Step S120: Acquire multiple sets of actual brightness and actual chromaticity data when controlling the change of grayscale display in at least one column within the display unit to display a specific grayscale. Further, this step collects actual display data by simulating different coupling scenarios. Specifically, while maintaining a specific grayscale of a particular primary color in most areas of the display unit, one or more columns of pixels are controlled to display different grayscales to simulate high-contrast coupling conditions. That is, by systematically changing the combination of the main display grayscale and the local column display grayscale within the display unit, the actual brightness and chromaticity data of the RGB three primary colors under various grayscale pairing conditions are obtained.

[0066] Furthermore, controlling at least one column in the display unit to display different gray levels includes controlling columns 1 to i in the display unit to display different gray levels, where i is an integer, and 1 <i≤ .

[0067] Furthermore, controlling at least one column in the display unit to display different gray levels includes: controlling at least one column in the display unit to display other gray levels of the same primary color, or controlling at least one column in the display unit to display 0-255 gray levels of different primary colors.

[0068] For example, combined Figure 5 As shown, step S120 includes the following steps:

[0069] Step S121: When displaying the first grayscale of the first primary color in the display unit, control at least one column in the display unit to display different grayscales, and measure the corresponding actual brightness and actual chromaticity. For example, the first primary color is red, and the first grayscale is grayscale 1. Specifically, step S121 includes obtaining the actual chromaticity and actual brightness of the following multiple grayscale combinations: Controlling most of the display unit to display red 1 gray, and one column to display red 0 gray, and measuring the actual brightness value L(r1-0-1) and chromaticity value C(r1-0-1) of red 1 gray at this time. Controlling most of the display unit to display red 1 gray, and one column to display red 2 gray, and measuring the actual brightness value L(r1-2-1) and chromaticity value C(r1-2-1) of red 1 gray at this time. The control display unit displays a large area of ​​red 1 gray, and one column displays red 3-255 gray. The actual luminance values ​​L(r1-3-1), ..., L(r1-255-1), and chromaticity values ​​C(r1-3-1), ..., C(r1-255-1) of the red 1 gray are measured respectively. The control display unit also displays a large area of ​​red 1 gray, and two columns display red 0-255 gray. The actual luminance values ​​L(r1-0-2), ..., L(r1-255-2), and chromaticity values ​​C(r1-0-2), ..., C(r1-255-2) of the red 1 gray are measured respectively. Finally, the control display unit displays a large area of ​​red 1 gray, and three columns (up to half the number of columns in the display unit) display red 0-255 gray. The actual luminance and chromaticity values ​​of the red 1 gray are measured respectively. The system controls the majority of the display unit to display red (1 gray), and one column to no more than half the number of columns in the display unit to display green (0-255 gray). The actual brightness and chromaticity values ​​of the red (1 gray) are measured at these times. The system also controls the majority of the display unit to display red (1 gray), and one column to no more than half the number of columns in the display unit to display blue (0-255 gray). The actual brightness and chromaticity values ​​of the red (1 gray) are measured at these times.

[0070] For example, see Figure 6 The display unit controls the first 1-8 columns to display red 1-gray and the 9th column to display black via row and column driving circuits, and measures the actual brightness value L(r1-0-1) and chromaticity value C(r1-0-1) of the red 1-gray at this time. It should be noted that it is also possible to control the display to show black in another column.

[0071] Step S122: When displaying other grayscale levels of the first primary color within the display unit, control at least one column in the display unit to display different grayscale levels, and measure the corresponding actual brightness and actual chromaticity. For example, the first primary color is red, and the other grayscale levels are grayscale 2-255. Specifically, step S122 includes obtaining the actual chromaticity and actual brightness of the following combinations of grayscale levels: Controlling most of the display unit to display red 2 gray, and one column to no more than half the number of columns in the display unit to display red 0-255 gray, and measuring the actual brightness and chromaticity values ​​of red 2 gray at this time. Controlling most of the display unit to display red 2 gray, and one column to no more than half the number of columns in the display unit to display green 0-255 gray, and measuring the actual brightness and chromaticity values ​​of red 2 gray at this time. Controlling most of the display unit to display red 2 gray, and one column to no more than half the number of columns in the display unit to display blue 0-255 gray, and measuring the actual brightness and chromaticity values ​​of red 2 gray at this time. Next, the display unit is sequentially controlled to display red 3 gray in most areas, and red 0-255 gray, blue 0-255, and green 0-255 in one column to no more than half the number of columns in the display unit. The actual brightness and chromaticity values ​​of red 3 gray are measured at these times. This process is repeated until the display unit is controlled to display red 255 gray in most areas, and red 0-255 gray, blue 0-255, and green 0-255 in one column to no more than half the number of columns in the display unit. The actual brightness and chromaticity values ​​of red 3 gray are measured at these times.

[0072] Step S123: When displaying grayscale levels 1-255 of the second primary color (such as green) in the display unit, control at least one column to display different grayscale levels respectively, and measure the actual brightness and actual chromaticity. This step is similar to the operation of obtaining actual data when displaying each grayscale level of the red primary color in steps S121 and S122, and will not be described in detail here.

[0073] Step S124: When displaying grayscale 1-255 of the third primary color (such as blue) in the display unit, repeat the above operation and measure the actual brightness and actual chromaticity.

[0074] Step S120 quantifies the deviation of the coupling effect on brightness / chromaticity by systematically changing the local grayscale combination, providing a data basis for the subsequent construction of the correction matrix, which is used to calculate the brightness correction coefficient and chromaticity correction coefficient to eliminate the impact of high contrast coupling on the display effect.

[0075] Step S130: Based on the luminance deviation threshold, multiple actual luminances, and initial luminance, obtain multiple luminance correction coefficients representing each specific gray level under different coupling scenarios, and based on the chrominance deviation threshold, multiple actual chrominances, and initial chrominance, obtain multiple chrominance correction coefficients representing each specific gray level under different coupling scenarios.

[0076] For example, combined Figure 7 As shown, step S130 includes:

[0077] Step S131: Calculate the brightness deviation between the initial brightness and multiple actual brightness levels at each specific grayscale. When the brightness deviation is greater than a brightness deviation threshold, determine the brightness correction coefficient based on the ratio of the corresponding initial brightness to the actual brightness. For example, for the first grayscale of the red primary color, when one column in the display unit displays red 0 gray while other areas display red 1 gray, the actual brightness L(r1-0-1) is measured, and the brightness deviation ΔL(r1-0-1) = [L(r1) - L(r1-0-1)] / L(r1) is calculated. If ΔL(r1-0-1) exceeds a preset brightness deviation threshold, the brightness correction coefficient is calculated. =L(r1) / L(r1-0-1); otherwise, this grayscale combination does not require correction. Similarly, for other grayscale levels of the red primary color (such as gray 2 to gray 255) and each grayscale level of the green and blue primary colors, repeat the above process to obtain a multidimensional matrix of brightness correction coefficients covering all possible coupled scenes.

[0078] Step S132: Calculate the chromaticity deviation between the initial chromaticity and multiple actual chromaticities at each specific grayscale. When the chromaticity deviation is greater than the chromaticity deviation threshold, determine the chromaticity correction coefficient based on the ratio of the corresponding initial chromaticity to the actual chromaticity. For example, for the first grayscale of the red primary color, when one column in the display unit displays red 0 gray while other areas display red 1 gray, the actual chromaticity C(r1-0-1) is measured, and the chromaticity deviation ΔC(r1-0-1) = [C(r1) - C(r1-0-1)] / C(r1) is calculated. If ΔC(r1-0-1) exceeds the preset chromaticity deviation threshold, the chromaticity correction coefficient... =C(r1) / C(r1-0-1). Otherwise, this grayscale combination does not require correction. This process extends to all primary colors and grayscale combinations, ultimately forming a multidimensional matrix of chromaticity correction coefficients corresponding to the luminance correction matrix, ensuring that the correction data fully covers the coupled effects of different colors, grayscale levels, and column display variations.

[0079] In other embodiments, such as Figure 3As shown, establishing the calibration matrix for the LED display screen further includes performing step S105 before step S110: adjusting the LED display screen to its initial state. Further, adjusting the LED display screen to its initial state includes adjusting the display chip parameters and other calibration methods to achieve a standard display effect. Exemplarily, other calibration methods include at least one of low grayscale correction, high grayscale correction, full grayscale correction, temperature compensation, or aging compensation. After adjusting to the initial state, the brightness and chromaticity of each grayscale level of the LED display screen are set as reference values ​​without coupling effects, providing an accurate reference basis for subsequent coupling calibration.

[0080] Next, step S200 is executed: the data to be displayed is corrected based on the luminance correction coefficient and chrominance correction coefficient in the correction matrix.

[0081] Furthermore, combined Figure 3 As shown, step S200 includes step S210: comparing the data to be displayed in each display unit with a grayscale threshold. When the data to be displayed in the display unit simultaneously has grayscale levels lower than a first grayscale threshold and higher than a second grayscale threshold, the data to be displayed in the display unit is corrected based on the luminance correction coefficient and chrominance correction coefficient in the correction matrix. For example, the first grayscale threshold and the second grayscale threshold can be set according to the actual application scenario; for example, the first grayscale threshold can be set to 10 grayscale levels, and the second grayscale threshold can be set to 200 grayscale levels. When display data with grayscale levels lower than 10 and higher than 200 are detected simultaneously in the display unit, the system automatically calls the corresponding luminance correction coefficient and chrominance correction coefficient in the correction matrix to compensate the affected pixels in real time. This threshold-triggered method can effectively reduce the amount of data processing and avoid the waste of computational resources caused by correcting the entire grayscale range, making it particularly suitable for high-dynamic display scenarios requiring fast response.

[0082] Furthermore, when calibrating the data to be displayed, an appropriate calibration matrix is ​​selected based on the structural characteristics of the display unit. For standard displays using the same driving architecture, the calibration matrix obtained from the first calibrated display unit or one of the display units can be extended to other similar display units.

[0083] In other embodiments, for irregularly shaped screens or composite displays with multiple driving parameters, it is necessary to establish independent correction matrices for different types of display units. During correction, the corresponding correction coefficient set is automatically matched based on the identification information of the display unit. This layered correction strategy ensures both correction accuracy and efficient utilization of system resources.

[0084] Figure 8 A schematic diagram of the structure of a display calibration device for an LED display screen provided according to an embodiment of this application is shown.

[0085] like Figure 8 As shown, the LED display screen's display calibration device includes a calibration matrix establishment module 310 and a display calibration module 320.

[0086] The correction matrix establishment module 310 includes an initial parameter acquisition unit 311, an actual parameter acquisition unit 312, and a correction coefficient calculation unit 313. The initial parameter acquisition unit 311 is configured to acquire the initial luminance and initial chromaticity of the RGB three primary colors in the display unit at each grayscale level. The actual parameter acquisition unit 312 is configured to acquire multiple sets of actual luminance and actual chromaticity by controlling at least one column to display different grayscale levels when the display unit displays a specific grayscale. The correction coefficient calculation unit 313 is configured to calculate luminance correction coefficients and chromaticity correction coefficient matrices by comparing the initial parameters with the actual parameters based on a luminance deviation threshold and a chromaticity deviation threshold. For example, the correction coefficient calculation unit 313 obtains multiple luminance correction coefficients representing each specific grayscale level in different coupling scenarios based on a luminance deviation threshold, multiple actual luminances, and initial luminance; and obtains multiple chromaticity correction coefficients representing each specific grayscale level in different coupling scenarios based on a chromaticity deviation threshold, multiple actual chromaticities, and initial chromaticity.

[0087] The display correction module 320 is configured to perform real-time correction processing on the data to be displayed based on a correction matrix. Furthermore, the display correction module 320 compares the data to be displayed within the display unit with preset grayscale thresholds. When it detects that grayscale levels below a first grayscale threshold and above a second grayscale threshold exist simultaneously within the display unit, it automatically calls the corresponding correction coefficients to dynamically adjust the display data. This design specifically addresses the problem of LED displays being susceptible to high-contrast image coupling when displaying low grayscale levels, achieving precise compensation through a pre-established multi-dimensional correction matrix.

[0088] Furthermore, the actual parameter acquisition unit 312 is configured to control the grayscale display of one column to no more than half of the columns when displaying different colors and grayscale levels in the display unit, and measure the corresponding actual brightness value and actual chromaticity value.

[0089] Furthermore, this application also provides an LED display screen, including a display calibration device for performing the above-described display calibration method.

[0090] Furthermore, this application also provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the steps of the above-described LED display screen calibration method. This computer-readable storage medium can be any medium capable of storing program code, such as a USB flash drive, portable hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk. By storing the program code of the above-described display calibration method in these media, the calibration method can be conveniently deployed and applied in different LED display screen control systems, improving its practicality and compatibility.

[0091] Furthermore, this application also provides an LED display system, including a display body, a control module, and a computer-readable storage medium. The control module is configured to read and execute a computer program in the storage medium to perform coupling correction on the display data of the display. This system, through an integrated correction method, can effectively solve the brightness and color deviation problems caused by high-contrast coupling, especially in the low-grayscale state of small-pitch LED displays, ensuring the uniformity and color accuracy of the displayed image. It is suitable for various application scenarios such as advertising displays and stage performances.

[0092] The LED display calibration method disclosed herein effectively solves the coupling phenomenon caused by differences in displayed content in LED displays by establishing a calibration matrix containing multi-dimensional brightness and color correction coefficients. Furthermore, this disclosure systematically acquires actual display parameters under different grayscale combinations and dynamically generates calibration coefficients based on a preset deviation threshold, enabling the display to maintain accuracy in brightness and color even in high-contrast scene scenarios. This calibration method addresses the root cause of coupling and has significant advantages over traditional fixed-parameter calibration methods.

[0093] Furthermore, the display calibration method disclosed herein optimizes data processing by setting grayscale thresholds. The system only initiates the corresponding calibration procedure when grayscale levels below a first grayscale threshold and above a second grayscale threshold exist simultaneously within the display unit. This ensures calibration accuracy in critical scenarios while avoiding unnecessary computational resource consumption. This intelligent threshold triggering mechanism is particularly suitable for optimizing the display of small-pitch LED displays in low-grayscale conditions, effectively improving the poor calibration performance of traditional methods for complex display content.

[0094] Furthermore, when calibrating the data to be displayed, an appropriate calibration matrix is ​​selected based on the structural characteristics of the display unit. For standard displays using the same driving architecture, the calibration matrix obtained from the first calibrated display unit or one of the display units can be extended to other similar display units. For irregularly shaped screens or composite displays with multiple driving parameters, independent calibration matrices need to be established for different types of display units. During calibration, the corresponding calibration coefficient set is automatically matched based on the identification information of the display unit. This layered calibration strategy ensures calibration accuracy while achieving efficient utilization of system resources.

[0095] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0096] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating this disclosure and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of this disclosure.

Claims

1. A display calibration method for an LED display screen, comprising: Establish a calibration matrix for the LED display screen, which includes multiple brightness correction coefficients and multiple chromaticity correction coefficients; The display data is corrected based on the luminance correction coefficients and chrominance correction coefficients in the correction matrix. The establishment of the calibration matrix for the LED display screen includes: The initial brightness and initial chromaticity of the RGB three primary colors in a display unit are obtained when they are each gray level. The LED display screen is divided into multiple display units, and each display unit includes m×n pixels, where m and n are positive integers. When a specific grayscale is displayed in the display unit, multiple sets of actual brightness and actual chromaticity are obtained and the grayscale display of at least one column is controlled to be changed. Based on the luminance deviation threshold, multiple actual luminances, and initial luminance, multiple luminance correction coefficients representing each specific gray level under different coupling scenarios are obtained; and based on the chrominance deviation threshold, multiple actual chrominances, and initial chrominance, multiple chrominance correction coefficients representing each specific gray level under different coupling scenarios are obtained.

2. The display correction method according to claim 1, wherein Obtaining the initial brightness and initial chromaticity of a display unit when the RGB primary colors are at their respective gray levels includes: Control the display of gray levels 0 to 255 for each primary color within the display unit; and The initial luminance and initial chromaticity are obtained by measuring and displaying the luminance and chromaticity values ​​at different gray levels for each primary color.

3. The display correction method according to claim 1, wherein When a specific grayscale is displayed in the display unit, controlling the change of multiple sets of actual brightness and actual chromaticity when displaying at least one column of grayscale includes: When the first primary color and first grayscale are displayed in the display unit, at least one column in the display unit is controlled to display different grayscales, and the corresponding actual brightness and actual chromaticity are measured. When displaying other gray levels of the first primary color in the display unit, at least one column in the display unit is controlled to display different gray levels, and the corresponding actual brightness and actual chromaticity are measured. When displaying grayscale levels 1-255 of the second primary color within the display unit, at least one column in the display unit is controlled to display different grayscale levels, and the corresponding actual brightness and actual chromaticity are measured; and When displaying grayscale levels 1-255 of the third primary color in the display unit, at least one column in the display unit is controlled to display different grayscale levels, and the corresponding actual brightness and actual chromaticity are measured.

4. The display calibration method according to claim 3, characterized in that, controlling at least one column of the display units to display different gray scales includes controlling 1stcolumn to ithcolumn of the display units to display different gray scales, i is an integer, and 1 < i ≤ .

5. The display correction method according to claim 3, wherein Controlling at least one column in the display unit to display different gray levels includes: controlling at least one column in the display unit to display other gray levels of the same primary color, or controlling at least one column in the display unit to display 0-255 gray levels of different primary colors.

6. The display correction method according to claim 1, wherein Based on the brightness deviation threshold, multiple actual brightness levels, and initial brightness, multiple brightness correction coefficients are obtained to characterize each specific gray level under different coupled scenarios, including: Calculate the brightness deviation between the initial brightness and multiple actual brightness levels at each specific gray level; When the brightness deviation is greater than the brightness deviation threshold, the brightness correction coefficient is determined based on the ratio of the corresponding initial brightness to the actual brightness.

7. The display correction method according to claim 1, wherein In addition, multiple chromaticity correction coefficients representing each specific gray level under different coupled scenarios are obtained based on chromaticity deviation threshold, multiple actual chromaticities, and initial chromaticity, including: Calculate the chromaticity deviation between the initial chromaticity and multiple actual chromaticities at each specific gray level; When the chromaticity deviation is greater than the chromaticity deviation threshold, the chromaticity correction coefficient is determined based on the ratio of the corresponding initial chromaticity to the actual chromaticity.

8. The display correction method according to claim 1, wherein The calibration of the data to be displayed includes: The data to be displayed in each display unit is compared with the grayscale threshold. When the data to be displayed in the display unit has gray levels that are both below a first gray level threshold and above a second gray level threshold, the data to be displayed in the display unit is corrected based on the luminance correction coefficient and chrominance correction coefficient in the correction matrix.

9. The display calibration method according to claim 1, characterized in that, Establishing a calibration matrix for LED displays also includes: Before obtaining the initial brightness and initial chromaticity, the LED display screen is adjusted to its initial state.

10. The display calibration method according to claim 1, characterized in that, The correction matrix is ​​a multi-dimensional matrix that includes the luminance correction coefficient and chromaticity correction coefficient of the RGB three primary colors under different grayscale combinations.

11. The display calibration method according to claim 1, characterized in that, Establishing a calibration matrix for LED displays also includes: For LED displays with different display unit structures, establish a correction matrix corresponding to each display unit.

12. A display calibration device for an LED display screen, comprising: The calibration matrix establishment module is used to establish a calibration matrix containing multiple luminance correction coefficients and multiple chrominance correction coefficients; The display correction module is used to correct the display data based on the luminance correction coefficients and chrominance correction coefficients in the correction matrix. The correction matrix establishment module includes: An initial parameter acquisition unit is used to acquire the initial brightness and initial chromaticity of each gray level of the RGB three primary color positions within a display unit. The LED display screen is divided into multiple display units, and each display unit includes m×n pixels, where m and n are positive integers. The actual parameter acquisition unit is used to acquire multiple sets of actual brightness and actual chromaticity when at least one column of grayscale is changed when displaying a specific grayscale in the display unit. The correction coefficient calculation unit obtains multiple brightness correction coefficients representing each specific gray level under different coupling scenarios based on the brightness deviation threshold, multiple actual brightness, and initial brightness, and obtains multiple chromaticity correction coefficients representing each specific gray level under different coupling scenarios based on the chromaticity deviation threshold, multiple actual chromaticity, and initial chromaticity.

13. The display calibration device according to claim 12, characterized in that, The actual parameter acquisition unit is configured to control and change the grayscale display of one column to no more than half of the columns when displaying different colors and grayscale levels in the display unit, and measure the corresponding actual brightness value and actual chromaticity value.

14. An LED display screen, characterized in that, Includes the display correction device as described in claim 12 or 13.

15. A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the display correction method as described in any one of claims 1-11.

16. A chip, characterized in that, Used to perform the display correction method as described in any one of claims 1-11.

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