LED Display Calibration Method, Device, Computer-Readable Medium and Monitor

Abstract

This application belongs to the field of display control technology, and particularly relates to an LED display correction method, device, computer-readable medium, and display. The method includes performing a first brightness and chromaticity correction on each display module; after the first brightness and chromaticity correction is completed, measuring the corrected brightness and chromaticity of each display module, and storing the brightness and chromaticity measurement data in the storage module of the display module; when different batches of display modules are mixed and spliced to form a display screen, by reading back the brightness and chromaticity measurement data corresponding to each display module, and screening out the brightness and chromaticity target values for the second brightness and chromaticity correction, and performing a second brightness and chromaticity correction on the display screen according to the brightness and chromaticity target values. In this way, when different batches of display modules are mixed and spliced into a display screen, performing secondary correction on the entire display screen can not only eliminate the brightness and chromaticity differences generated by different batches of products, but also reduce the correction difficulty and improve the correction efficiency.

Description

Technical Field

[0001] This application belongs to the technical field of display control, and particularly relates to an LED display screen calibration method, device, computer-readable medium, and display. Background Art

[0002] As a new display technology, LED display screens have gradually been accepted by the market due to their advantages such as energy conservation, environmental protection, and high brightness, and are thus widely used in fields such as urban media and urban traffic electronic signs.

[0003] An LED display screen includes multiple display modules. To ensure the product quality of each display module, brightness and chromaticity calibration is performed on each batch of display modules when they leave the factory. However, there will still be differences in brightness and chromaticity among display modules produced in different batches. With the booming development of large LED display screens, in order to quickly meet market demands, most manufacturers have stocked finished products, and these finished products are composed of products produced in different batches.

[0004] When display modules produced in different batches are spliced together to form a display screen, due to the differences in brightness and chromaticity between display modules produced in different batches, the overall brightness and chromaticity of the spliced display screen are uneven. In the related art, if the entire display screen needs to be calibrated again, calibration personnel with professional skills are required to assemble the screen body in a predetermined order and position, and then use calibration equipment to perform on-site calibration on the entire screen. However, this requires high requirements for calibration personnel, with not only high calibration difficulty but also low calibration efficiency.

[0005] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of this application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0006] The purpose of this application is to provide an LED display screen calibration method, device, computer-readable medium, and display, which can, to a certain extent, not only eliminate the brightness and chromaticity color differences generated when display modules produced in different batches are spliced together to form a display screen, but also reduce the calibration difficulty and improve the calibration efficiency.

[0007] Other features and advantages of this application will become apparent through the following detailed description, or will be partially learned through the practice of this application.

[0008] According to one aspect of the embodiments of this application, an LED display screen calibration method is provided. The LED display screen includes multiple display modules, and the method includes:

[0009] Performing a first brightness and chromaticity calibration on each of the display modules;

[0010] After the first brightness and chromaticity correction is completed, the corrected brightness and chromaticity of each display module are measured, and the brightness and chromaticity measurement data are stored in the storage module of the display module;

[0011] When display modules of different batches are mixed and spliced to form a display screen, by reading back the brightness and chromaticity measurement data corresponding to each display module, and screening out the brightness and chromaticity target values for the second brightness and chromaticity correction, the display screen is subjected to the second brightness and chromaticity correction according to the brightness and chromaticity target values.

[0012] According to one aspect of the embodiments of the present application, there is provided an LED display screen correction device. The LED display screen includes a plurality of display modules, and the device includes:

[0013] A first correction module for performing the first brightness and chromaticity correction on each display module;

[0014] A measurement module for measuring the corrected brightness and chromaticity of each display module after the first brightness and chromaticity correction is completed, and storing the brightness and chromaticity measurement data in the storage module of the display module;

[0015] A second correction module for, when display modules of different batches are mixed and spliced to form a display screen, reading back the brightness and chromaticity measurement data corresponding to each display module, screening out the brightness and chromaticity target values for the second brightness and chromaticity correction, and performing the second brightness and chromaticity correction on the display screen according to the brightness and chromaticity target values.

[0016] In some embodiments of the present application, based on the above technical solution, the second correction module is further configured to read back the brightness and chromaticity measurement data of each display module; calculate the corresponding gamut range according to the brightness and chromaticity measurement data of each display module; compare the gamut ranges corresponding to the brightness and chromaticity measurement data of each display module, and use the data corresponding to the smallest gamut range as the brightness and chromaticity target value.

[0017] In some embodiments of the present application, based on the above technical solution, the second correction module is further configured to perform gamut space conversion on the brightness and chromaticity measurement data of each display module and the brightness and chromaticity target value to obtain the conversion coefficient of each display module; obtain the second point-by-point correction coefficient of each display module according to the conversion coefficient of each display module, and adjust the brightness and chromaticity of the display module through the second point-by-point correction coefficient to perform the second brightness and chromaticity correction on the display screen.

[0018] In some embodiments of the present application, based on the above technical solutions, the second correction module is further configured to convert the brightness and chromaticity measurement data of each display module into a corresponding gamut tristimulus value matrix; convert the brightness and chromaticity target value into a target gamut tristimulus value matrix; and obtain a conversion coefficient for each display module according to the gamut tristimulus value matrix and the target gamut tristimulus value matrix, where the conversion coefficient is used to convert the gamut tristimulus value matrix into the target gamut tristimulus value matrix.

[0019] In some embodiments of the present application, based on the above technical solutions, the second correction module is further configured to obtain the first point-by-point correction coefficient of each display module; multiply the conversion coefficient of each display module by the first point-by-point correction coefficient to obtain the second point-by-point correction coefficient of each display module.

[0020] In some embodiments of the present application, based on the above technical solutions, the device further includes an association module, configured to obtain the serial number of each display module; associate the serial number of each display module with the first point-by-point correction coefficient of each display module and the brightness and chromaticity measurement data of each display module, and store them in the memory.

[0021] In some embodiments of the present application, based on the above technical solutions, the measurement module is further configured to input the same brightness signal and the same lighting time to each display module, and measure the brightness and chromaticity of each display module through a colorimeter to obtain the brightness and chromaticity measurement data of each display module.

[0022] According to one aspect of the embodiments of the present application, there is provided a computer-readable medium having a computer program stored thereon, and when the computer program is executed by a processor, the LED display screen correction method in the above technical solutions is implemented.

[0023] According to one aspect of the embodiments of the present application, there is provided a display, which includes: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the LED display screen correction method in the above technical solutions by executing the executable instructions.

[0024] According to one aspect of the embodiments of the present application, there is provided a computer program product or a computer program, which includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the LED display screen correction method in the above technical solutions.

[0025] In the technical solution provided by the embodiment of the present application, when assembling different batches of display modules into a display screen, the chrominance measurement values obtained by measuring after the first chrominance correction can be read back, and the chrominance target values for the second chrominance correction can be determined by screening them. Then, the display screen is corrected as a whole according to the chrominance target values, so that the chrominance of the entire display screen can be made uniform to eliminate the chrominance difference between different display modules. That is, when different batches of display modules are assembled into a display screen, the display screen is corrected twice as a whole, so that the chrominance difference generated by different batches of products can be eliminated. In addition, by adopting the technical solution of the present application, it is not necessary for the calibration personnel to assemble the screen body in a predetermined order and position, and then use the calibration equipment to perform secondary calibration on the assembled display screen. In this way, the calibration difficulty is reduced and the calibration efficiency is improved.

[0026] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0028] Figure 1 Schematically shows the step flow of the LED display screen calibration method provided by an embodiment of the present application.

[0029] Figure 2 Schematically shows the step flow of reading back the chrominance measurement data corresponding to each display module and screening out the chrominance target values for the second chrominance correction in an embodiment of the present application.

[0030] Figure 3 Schematically shows the step flow of performing gamut space conversion on the chrominance measurement data of each display module and the chrominance target value to obtain the conversion coefficients of each display module in an embodiment of the present application.

[0031] Figure 4 Schematically shows the step flow of the LED display screen calibration method provided by another embodiment of the present application.

[0032] Figure 5 Schematically shows the structural block diagram of the LED display screen calibration device provided by the embodiment of the present application.

[0033] Figure 6A block diagram of a computer system suitable for implementing the display according to the embodiments of the present application is schematically shown. Detailed implementation manners

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art.

[0035] In addition, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present application. However, those skilled in the art will realize that the technical solutions of the present application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the present application.

[0036] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0037] The flowcharts shown in the drawings are only illustrative and do not necessarily include all the contents and operations / steps, nor do they necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0038] With the booming development of large LED display screens, in order to quickly meet the market demand, most manufacturers have stocked finished products, which will result in some orders being composed of products from different batches. Although each batch of products has been subjected to brightness and chromaticity calibration during production, due to the characteristics of LEDs, there will be wavelength and brightness differences in each batch of LEDs. In addition, the brightness and chromaticity target values are different each time the screen factory calibrates the brightness and chromaticity of the LEDs, and it is basically impossible to make the brightness and chromaticity of the screen bodies of bright batch orders completely consistent. Therefore, there are still differences in brightness and chromaticity after the products manufactured in different batches are calibrated.

[0039] To solve the above problems, in the related art, there are currently two solutions for LED display panels of different batches. The first solution is to compare the color gamuts of different batch orders and perform single-box calibration in the factory. The second solution is to mix and use products of different batches that have been calibrated and stocked in the warehouse, and generally perform full-screen calibration at the installation site.

[0040] If the above two methods are adopted, the following problems will exist. When re-calibrating all the boxes mixed with different batches using professional calibration equipment in the factory, it will waste time and labor costs. Secondly, when re-calibrating the boxes mixed with different batches at the installation site of the display panel using professional calibration equipment and requiring professional personnel to operate, it will waste time, equipment, and labor costs.

[0041] To solve the above problems, this application proposes an LED display calibration method. This method first performs the first brightness and chromaticity calibration on each display module. After the first brightness and chromaticity calibration is completed, the calibrated brightness and chromaticity of each display module are measured, and the brightness and chromaticity measurement data are stored in the storage module of the display module. When display modules of different batches are mixed and spliced to form a display screen, by reading back the brightness and chromaticity measurement data corresponding to each display module and screening out the brightness and chromaticity target values for the second brightness and chromaticity calibration, the display screen is subjected to the second brightness and chromaticity calibration according to the brightness and chromaticity target values. In this way, when display modules of different batches are mixed and spliced into a display screen, using the same brightness and chromaticity target value to perform secondary calibration on the entire display screen, not only can the brightness and chromaticity differences generated by products of different batches be eliminated. Moreover, when performing secondary calibration on the display screen, it is not necessary for the calibration personnel to assemble the screen body in a predetermined order and position and then use calibration equipment for calibration, thereby reducing the calibration difficulty and improving the calibration efficiency.

[0042] The following will make a detailed description of the LED display calibration method, device, computer-readable medium, and display provided by this application in combination with specific embodiments.

[0043] Figure 1 Schematically shows the step flow of the LED display calibration method provided by an embodiment of this application. The execution subject of this LED display calibration method can be a terminal device or a server. The LED display includes multiple display modules, such as Figure 1 shown, this LED display calibration method mainly can include the following steps S101 to step S103.

[0044] Step S101, perform the first brightness and chromaticity calibration on each display module.

[0045] When each display module leaves the factory, the brightness and chromaticity of each display module will be calibrated, that is, the first brightness and chromaticity calibration.

[0046] Step S102, after the first brightness and chroma correction is completed, measure the corrected brightness and chroma of each display module, and store the brightness and chroma measurement data in the storage module of the display module.

[0047] After the first brightness and chroma correction, re-measure the brightness and chroma of each display module, and store the measured brightness and chroma measurement values in the storage module of the display module. This is beneficial for directly obtaining data from the memory when performing secondary correction on the display module, improving the convenience of data acquisition, and thus enhancing the correction efficiency during secondary correction.

[0048] Step S103, when assembling different batches of display modules into a display screen by mixing and splicing, read back the brightness and chroma measurement data corresponding to each display module, screen out the brightness and chroma target values for the second brightness and chroma correction, and perform the second brightness and chroma correction on the display screen according to the brightness and chroma target values.

[0049] When assembling different batches of display modules into a display screen by mixing and splicing, read back the brightness and chroma values of each display module re-measured after the first brightness and chroma correction to obtain the brightness and chroma measurement data corresponding to each display module. Then screen out the brightness and chroma target values for the second brightness and chroma correction from the brightness and chroma measurement data corresponding to each display module, and perform secondary correction on the display screen using the same brightness and chroma target value for each display module, so as to eliminate the brightness and chroma differences of the display screen composed of different batches of display modules.

[0050] In the technical solution provided in the embodiments of the present application, when assembling different batches of display modules into a display screen by mixing and splicing, the measured brightness and chroma measurement values after the first brightness and chroma correction can be read back and screened to determine the brightness and chroma target values for the second brightness and chroma correction. Then, perform overall correction on the display screen according to the brightness and chroma target values, so as to make the brightness and chroma of the entire display screen uniform and eliminate the brightness and chroma differences between different display modules. That is, when different batches of display modules are mixed and spliced into a display screen, perform secondary correction on the entire display screen, so as to eliminate the brightness and chroma differences generated by different batches of products. In addition, adopting the technical solution of the present application does not require the correction personnel to assemble the screen body in a predetermined order and position, and then use the correction equipment to perform secondary correction on the assembled display screen. In this way, the correction difficulty is reduced and the correction efficiency is improved.

[0051] In some optional embodiments, refer to Figure 2 , Figure 2Schematically shown is the step flow of obtaining the chromaticity target value for the second chromaticity correction by reading back the chromaticity measurement data corresponding to each display module and screening. By reading back the chromaticity measurement data corresponding to each display module and screening to obtain the chromaticity target value for the second chromaticity correction, it may specifically include the following steps S201 to step S203.

[0052] Step S201: Read back the chromaticity measurement data of each display module.

[0053] Step S202: Calculate the corresponding gamut range according to the chromaticity measurement data of each display module.

[0054] Step S203: Compare the gamut ranges corresponding to the chromaticity measurement data of each display module, and use the data corresponding to the minimum gamut range as the chromaticity target value.

[0055] Among them, each display module may be an LED light board or an LED cabinet, and a single LED cabinet includes one or more LED light boards. For an LED light board, for example, it may be an LED light board provided with a memory.

[0056] For a display module, specifically, the display module includes a plurality of pixel points, and a single pixel point includes one or more LEDs. For the case of multiple LEDs, for example, it may include red (R), green (G), and blue (B) three-color LEDs, and may even include white (W) LEDs. Obtaining a plurality of chromaticity measurement data after factory calibration of the display module may be the calibrated red, green, blue, and white chromaticity data measured by a chromaticity meter. For example, Rx_n, Ry_n, Gx_n, Gy_n, Bx_n, By_n, Wx_n, Wy_n, and WL_n. Among them, Rx_n and Ry_n are the calibrated red coordinates of the nth light board or cabinet measured by the chromaticity meter, Gx_n and Gy_n are the calibrated green coordinates of the nth light board or cabinet measured by the chromaticity meter, Bx_n and By_n are the calibrated blue coordinates of the nth light board or cabinet measured by the chromaticity meter, Wx_n and Wy_n are the calibrated white coordinates of the nth light board or cabinet measured by the chromaticity meter, and WL_n is the calibrated white brightness of the nth light board or cabinet measured by the chromaticity meter.

[0057] After obtaining the brightness and chromaticity measurement data of each display module, the optimal red, green, blue, and white coordinates and brightness and chromaticity data are automatically selected and calculated according to a preset algorithm as target values, that is, the brightness and chromaticity target values are obtained. Specifically, the target brightness and chromaticity data include Rx_target, Ry_target, Gx_target, Gy_target, Bx_target, By_target, WL_target, Wx_target, and Wy_target. Among them, Rx_target and Ry_target are the target values of the red coordinates, Gx_target and Gy_target are the target values of the green coordinates, Bx_target and By_target are the target values of the blue coordinates, WL_target is the target white brightness, and Wx_target and Wy_target are the target values of the white coordinates. When determining the target brightness and chromaticity data, the brightness and chromaticity target values can be determined in the following manner:

[0058] Rx_target = Rx_min;

[0059] Ry_target = 1 / 2(Ry_max - Ry_min) + Ry_min;

[0060] Gx_target = 1 / 2(Gx_max - Gx_min) + Gx_min;

[0061] Gy_target = Gy_min;

[0062] Bx_target = Bx_max;

[0063] By_target = 1 / 2(By_max - By_min) + By_min;

[0064] WL_target = WL_max;

[0065] Wx_target = 1 / 2(Wx_max - Wx_min) + Wx_min;

[0066] Wy_target = 1 / 2(Wy_max - Wy_min) + Wy_min.

[0067] In this way, by using the data corresponding to the minimum gamut range as the brightness and chromaticity target values, and each display module corresponding to the same brightness and chromaticity target value, it is beneficial to keep the brightness and chromaticity of each display module consistent and uniform.

[0068] In some alternative embodiments, a second brightness and chromaticity correction is performed on the display screen according to the brightness and chromaticity target values, including:

[0069] Convert the brightness and chromaticity measurement data of each display module into the corresponding chromaticity target value in the chromaticity space to obtain the conversion coefficient of each display module.

[0070] Among them, convert the brightness and chromaticity measurement data and the target brightness and chromaticity data in the chromaticity space to convert the chromaticity gamut corresponding to the brightness and chromaticity measurement data to the chromaticity gamut corresponding to the target brightness and chromaticity data. After converting the brightness and chromaticity measurement data and the target brightness and chromaticity data in the chromaticity space, the conversion coefficient is obtained.

[0071] Obtain the second point-by-point correction coefficient of each display module according to the conversion coefficient of each display module, and adjust the brightness and chromaticity of the display module through the second point-by-point correction coefficient to perform the second brightness and chromaticity correction on the display screen.

[0072] Obtain the second point-by-point correction coefficient of each display module according to the conversion coefficient, and correct the brightness and chromaticity of each display module through the second point-by-point correction coefficient, so as to eliminate the brightness and chromaticity color difference generated by different batches of display modules.

[0073] In the technical solution provided by the embodiment of the present application, when different batches of display modules are mixed and spliced into a display screen, the whole display screen is corrected twice, so as to eliminate the brightness and chromaticity difference generated by different batches of products. In addition, adopting the technical solution of the present application does not require the correction personnel to assemble the screen body in a predetermined order and position, and then use the correction equipment to perform the second correction on the assembled display screen. In this way, the correction difficulty is reduced and the correction efficiency is improved.

[0074] In some alternative embodiments, refer to Figure 3 , Figure 3 which schematically shows the step flow of converting the brightness and chromaticity measurement data of each display module into the corresponding chromaticity target value in the chromaticity space to obtain the conversion coefficient of each display module in an embodiment of the present application. Converting the brightness and chromaticity measurement data of each display module into the corresponding chromaticity target value in the chromaticity space to obtain the conversion coefficient of each display module may specifically include the following steps S301 to S303.

[0075] Step S301, convert the brightness and chromaticity measurement data of each display module into the corresponding chromaticity tristimulus value matrix.

[0076]

[0077] Among them, RX_n, RY_n, and RZ_n are the tristimulus values of red in the original color gamut space; GX_n, GY_n, and GZ_n are the tristimulus values of green in the original color gamut space; BX_n, BY_n, and BZ_n are the tristimulus values of blue in the original color gamut space. For tristimulus values, according to the Grassmann color matching principle, three primary colors are selected, and any one of the three primary colors cannot be obtained by adding and mixing the other two primary colors. For example, for the RGB primary colors, by selecting a specific white light as the standard and determining the relative brightness units of the primary colors, the light of other colors can be regarded as being mixed by different amounts of the primary color lights, and the respective amounts of the required primary colors are the tristimulus values.

[0078] Step S302: Convert the luminance and chrominance target values into a target color gamut tristimulus value matrix.

[0079]

[0080] Among them, RX_target, RY_target, and RZ_target are the tristimulus values of red in the target color gamut space; GX_target, GY_target, and GZ_target are the tristimulus values of green in the target color gamut space; BX_target, BY_target, and BZ_target are the tristimulus values of blue in the target color gamut space.

[0081] Step S303: Obtain the conversion coefficients of each display module according to the color gamut tristimulus value matrix and the target color gamut tristimulus value matrix. The conversion coefficients are used to convert the color gamut tristimulus value matrix into the target color gamut tristimulus value matrix.

[0082] Among them, the conversion formula between the color gamut tristimulus value matrix and the target color gamut tristimulus value matrix is:

[0083] (XYZ_n)*(Conversion coefficient_n)=(XYZ_target)

[0084] Among them, Conversion coefficient_n is the conversion coefficient.

[0085] In this way, by performing color gamut space conversion on the luminance and chrominance measurement data and the target luminance and chrominance data, the color gamut corresponding to the luminance and chrominance measurement data is converted to the color gamut corresponding to the target luminance and chrominance data, so as to solve the problem of color difference in display luminance and chrominance caused by color gamut differences, which is beneficial to achieving high luminance and chrominance consistency and uniformity of the display module after secondary correction.

[0086] In some optional embodiments, obtaining the second point-by-point correction coefficients of each display module according to the conversion coefficients of each display module includes:

[0087] Obtain the first point-by-point correction coefficients of each display module;

[0088] Multiply the conversion coefficients of each display module by the first point-by-point correction coefficients to obtain the second point-by-point correction coefficients of each display module.

[0089] In this way, by multiplying the conversion coefficients by the first point-by-point correction coefficients of each display module to obtain the second point-by-point correction coefficients of each display module, it is beneficial to adaptively adjust the brightness and chromaticity of each light-emitting diode, thereby improving the uniformity of the brightness and chromaticity of the entire display screen.

[0090] In some alternative embodiments, the method further includes:

[0091] Obtain the serial numbers of each display module;

[0092] Associate the serial numbers of each display module with the first point-by-point correction coefficients and the brightness and chromaticity measurement data of each display module, and store them in a memory.

[0093] In this way, by associating the serial numbers with the first point-by-point correction coefficients and the brightness and chromaticity data and storing them in the memory, it serves as backup data for later maintenance. Here, the serial number of the display module can be generated by software or obtained by scanning the label of the display module. Among them, the label of the display module can be a paper label or an electronic label, which is not limited herein.

[0094] In some alternative embodiments, after the first brightness and chromaticity correction is completed, measure the corrected brightness and chromaticity of each display module, including:

[0095] Input the same brightness signal and the same lighting time to each display module, and measure the brightness and chromaticity of each display module with a colorimeter to obtain the brightness and chromaticity measurement data of each display module.

[0096] In this way, by inputting the same brightness signal and the same lighting time to the display module, the interference of the external environment during measurement is objectively reduced, the error during measurement is reduced, and the accuracy of the measurement data is improved.

[0097] See Figure 4 , Figure 4 schematically shows the step flow of an LED display correction method provided by another embodiment of the present application. The LED display correction method mainly may include the following steps S401 to step S406.

[0098] Step S401, perform the first brightness and chromaticity correction on each display module.

[0099] When each display module leaves the factory, the brightness and chromaticity of each display module are calibrated, that is, the first brightness and chromaticity calibration.

[0100] Step S402, after the first brightness and chromaticity calibration is completed, measure the calibrated brightness and chromaticity of each display module, and store the brightness and chromaticity measurement data in the storage module of the display module.

[0101] After the first brightness and chromaticity calibration, re-measure the brightness and chromaticity of each display module, and store the measured brightness and chromaticity measurement values in the storage module of the display module. This is beneficial for directly obtaining data from the memory when performing secondary calibration on the display module, improving the convenience of obtaining data, and thus enhancing the calibration efficiency during secondary calibration.

[0102] Step S403, when mixing and splicing display modules of different batches to form a display screen, read back the brightness and chromaticity measurement data corresponding to each display module.

[0103] Step S404, by reading back the brightness and chromaticity measurement data corresponding to each display module, and screening to obtain the brightness and chromaticity target values for the second brightness and chromaticity calibration.

[0104] Step S405, perform gamut space conversion on the brightness and chromaticity measurement data of each display module and the brightness and chromaticity target values to obtain the conversion coefficients of each display module.

[0105] Among them, perform gamut space conversion on the brightness and chromaticity measurement data and the target brightness and chromaticity data to convert the gamut corresponding to the brightness and chromaticity measurement data to the gamut corresponding to the target brightness and chromaticity data. After performing gamut space conversion on the brightness and chromaticity measurement data and the target brightness and chromaticity data, the conversion coefficients are obtained.

[0106] Step S406, multiply the conversion coefficients of each display module by the first point-by-point calibration coefficients to obtain the second point-by-point calibration coefficients of each display module, and adjust the brightness and chromaticity of the display module through the second point-by-point calibration coefficients.

[0107] In the technical solution provided by the embodiment of the present application, when assembling display modules of different batches into a display screen, the chrominance measurement values obtained by measurement after the first chrominance correction can be read back, and the chrominance target values for the second chrominance correction can be determined by screening them. Then, the display screen is corrected as a whole according to the chrominance target values, so that the chrominance of the entire display screen can be made uniform to eliminate the chrominance difference between different display modules. That is, when display modules of different batches are mixed and spliced into a display screen, the display screen is corrected twice as a whole, so that the chrominance difference generated by products of different batches can be eliminated. In addition, adopting the technical solution of the present application does not require the calibration personnel to assemble the screen body in a predetermined order and position, and then use the calibration equipment to perform secondary calibration on the assembled display screen. In this way, the calibration difficulty is reduced and the calibration efficiency is improved.

[0108] It should be noted that although the steps of the method in the present application are described in a specific order in the drawings, this does not require or imply that these steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired result. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step for execution, and / or one step may be decomposed into multiple steps for execution, etc.

[0109] The following introduces the device embodiments of the present application, which can be used to execute the LED display screen calibration method in the above embodiments of the present application. Figure 5 Schematically shows the structural block diagram of the LED display screen calibration device provided by the embodiment of the present application. As Figure 5 shown, a kind of LED display screen calibration device 500 is provided, including:

[0110] A first calibration module 501, configured to perform the first chrominance calibration on each display module;

[0111] A measurement module 502, configured to measure the chrominance of each display module after the first chrominance calibration is completed, and store the chrominance measurement data in the storage module of the display module;

[0112] A second calibration module 503, configured to, when display modules of different batches are mixed and spliced into a display screen, read back the chrominance measurement data corresponding to each display module, screen out the chrominance target values for the second chrominance calibration, and perform the second chrominance calibration on the display screen according to the chrominance target values.

[0113] In some embodiments of the present application, based on the above technical solutions, the second correction module 503 is further configured to read back the brightness and chromaticity measurement data of each display module; calculate the corresponding color gamut range according to the brightness and chromaticity measurement data of each display module; compare the color gamut ranges corresponding to the brightness and chromaticity measurement data of each display module, and use the data corresponding to the minimum color gamut range as the brightness and chromaticity target value.

[0114] In some embodiments of the present application, based on the above technical solutions, the second correction module 503 is further configured to perform color gamut space conversion on the brightness and chromaticity measurement data of each display module and the brightness and chromaticity target value to obtain the conversion coefficient of each display module; obtain the second point-by-point correction coefficient of each display module according to the conversion coefficient of each display module, and adjust the brightness and chromaticity of the display module through the second point-by-point correction coefficient to perform the second brightness and chromaticity correction on the display screen.

[0115] In some embodiments of the present application, based on the above technical solutions, the second correction module 503 is further configured to convert the brightness and chromaticity measurement data of each display module into a corresponding color gamut tristimulus value matrix; convert the brightness and chromaticity target value into a target color gamut tristimulus value matrix; obtain the conversion coefficient of each display module according to the color gamut tristimulus value matrix and the target color gamut tristimulus value matrix, and the conversion coefficient is used to convert the color gamut tristimulus value matrix into the target color gamut tristimulus value matrix.

[0116] In some embodiments of the present application, based on the above technical solutions, the second correction module 503 is further configured to obtain the first point-by-point correction coefficient of each display module; multiply the conversion coefficient of each display module by the first point-by-point correction coefficient to obtain the second point-by-point correction coefficient of each display module.

[0117] In some embodiments of the present application, based on the above technical solutions, the device further includes an association module, configured to obtain the serial number of each display module; associate the serial number of each display module with the first point-by-point correction coefficient of each display module and the brightness and chromaticity measurement data of each display module, and store them in the memory.

[0118] In some embodiments of the present application, based on the above technical solutions, the measurement module is further configured to input the same brightness signal and the same lighting time to each display module, and measure the brightness and chromaticity of each display module through a chromaticity meter to obtain the brightness and chromaticity measurement data of each display module.

[0119] The specific details of the LED display correction device provided in each embodiment of the present application have been described in detail in the corresponding method embodiments, and will not be repeated here.

[0120] Figure 6A block diagram of a computer system for implementing the display of the embodiments of the present application is schematically shown.

[0121] It should be noted that Figure 6 the computer system 600 of the display shown is only an example and should not impose any limitations on the functions and usage scope of the embodiments of the present application.

[0122] As Figure 6 shown, the computer system 600 includes a central processing unit 601 (Central Processing Unit, CPU), which can perform various appropriate actions and processes according to the program stored in the read-only memory 602 (Read-Only Memory, ROM) or the program loaded from the storage section 608 into the random access memory 603 (Random Access Memory, RAM). In the random access memory 603, various programs and data required for system operations are also stored. The central processing unit 601, the read-only memory 602, and the random access memory 603 are connected to each other via a bus 604. The input / output interface 606 (Input / Output interface, i.e., I / O interface) is also connected to the bus 604.

[0123] The following components are connected to the input / output interface 606: an input section 606 including a keyboard, a mouse, etc.; an output section 607 including, for example, a cathode ray tube (Cathode Ray Tube, CRT), a liquid crystal display (Liquid Crystal Display, LCD), etc. and a speaker, etc.; a storage section 608 including a hard disk, etc.; and a communication section 609 including a network interface card such as a local area network card, a modem, etc. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the input / output interface 606 as needed. A removable medium 611, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 610 as needed so that the computer program read from it can be installed into the storage section 608 as needed.

[0124] In particular, according to the embodiments of the present application, the processes described in each method flowchart can be implemented as computer software programs. For example, the embodiments of the present application include a computer program product that includes a computer program carried on a computer-readable medium, and the computer program includes program codes for performing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from the network through the communication section 609 and / or installed from the removable medium 611. When the computer program is executed by the central processing unit 601, various functions defined in the system of the present application are executed.

[0125] It should be noted that the computer-readable medium shown in the embodiments of the present application can be a computer-readable signal medium, a computer-readable storage medium, or any combination of the two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the computer-readable storage medium can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, the computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system, apparatus, or device. In the present application, the computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, in which computer-readable program code is carried. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium, and this computer-readable medium can send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted by any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0126] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code, and the above module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks shown can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram or flowchart, and the combination of blocks in the block diagram or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0127] It should be noted that although several modules or units of a device for action execution are mentioned in the above detailed description, such division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of the two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0128] Through the description of the above embodiments, those skilled in the art can easily understand that the example embodiments described herein can be implemented by software, or by a combination of software and necessary hardware. Therefore, the technical solutions according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (such as a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.

[0129] After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily conceive of other embodiments of the present application. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common knowledge or conventional technical means in the technical field not disclosed in the present application.

[0130] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. An LED display correction method, characterized in that, The LED display screen includes a plurality of display modules, and the method includes: Performing first brightness and chromaticity correction on each of the display modules; After the first brightness and chromaticity correction is completed, measuring the corrected brightness and chromaticity of each of the display modules, and storing the brightness and chromaticity measurement data in the storage module of the display module; When mixing and splicing display modules of different batches to form a display screen, by reading back the brightness and chromaticity measurement data corresponding to each of the display modules, and screening to obtain the brightness and chromaticity target values for the second brightness and chromaticity correction; Performing gamut space conversion on the brightness and chromaticity measurement data of each display module and the brightness and chromaticity target values to obtain the conversion coefficients of each display module; Obtaining the first point-by-point correction coefficients of each display module; Multiplying the conversion coefficients of each display module by the first point-by-point correction coefficients to obtain the second point-by-point correction coefficients of each display module, and adjusting the brightness and chromaticity of the display module by the second point-by-point correction coefficients to perform second brightness and chromaticity correction on the display screen.

2. The LED display calibration method according to claim 1, wherein The step of reading back the brightness and chromaticity measurement data corresponding to each of the display modules and screening to obtain the brightness and chromaticity target values for the second brightness and chromaticity correction includes: Reading back the brightness and chromaticity measurement data of each display module; Calculating the corresponding gamut range according to the brightness and chromaticity measurement data of each display module; Comparing the gamut ranges corresponding to the brightness and chromaticity measurement data of each display module, and taking the data corresponding to the minimum gamut range as the brightness and chromaticity target value.

3. The LED display correction method according to claim 1, wherein The step of performing gamut space conversion on the brightness and chromaticity measurement data of each display module and the brightness and chromaticity target values to obtain the conversion coefficients of each display module includes: Converting the brightness and chromaticity measurement data of each display module into a corresponding gamut tristimulus value matrix; Converting the brightness and chromaticity target value into a target gamut tristimulus value matrix; According to the gamut tristimulus value matrix and the target gamut tristimulus value matrix, obtaining the conversion coefficients of each display module, where the conversion coefficients are used to convert the gamut tristimulus value matrix into the target gamut tristimulus value matrix.

4. The LED display calibration method according to claim 1, wherein, The method further includes: Obtaining the serial numbers of each display module; Associating the serial numbers of each display module with the first point-by-point correction coefficients of each display module and the brightness and chromaticity measurement data of each display module, and storing them in a memory.

5. The LED display correction method according to claim 1, wherein After the first brightness and chromaticity correction is completed, measuring the corrected brightness and chromaticity of each of the display modules includes: Inputting the same brightness signal and the same lighting time to each display module, and measuring the brightness and chromaticity of each display module by a chromaticity meter to obtain the brightness and chromaticity measurement data of each display module.

6. An LED display correction device, characterized in that, The LED display screen includes a plurality of display modules, and the device includes: A first correction module for performing first brightness and chromaticity correction on each of the display modules; A measurement module for measuring the corrected brightness and chromaticity of each of the display modules after the first brightness and chromaticity correction is completed, and storing the brightness and chromaticity measurement data in the storage module of the display module; A second calibration module, configured to, when different batches of display modules are mixed and spliced to form a display screen, obtain the chrominance target values for the second chrominance calibration by reading back the chrominance measurement data corresponding to each of the display modules and screening, perform a color gamut space conversion on the chrominance measurement data of each display module and the chrominance target values to obtain the conversion coefficients of each display module; obtain the first point-by-point calibration coefficients of each display module; multiply the conversion coefficients of each display module by the first point-by-point calibration coefficients to obtain the second point-by-point calibration coefficients of each display module, and adjust the chrominance of the display module by the second point-by-point calibration coefficients to perform a second chrominance calibration on the display screen.

7. A computer-readable medium, characterized in that, A computer program is stored on the computer-readable medium, and when the computer program is executed by a processor, the LED display screen calibration method according to any one of claims 1 to 5 is implemented.

8. A display, characterized in that, Comprising: A processor; And A memory for storing executable instructions of the processor; Wherein, the processor is configured to execute the LED display screen calibration method according to any one of claims 1 to 5 by executing the executable instructions.

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