LED display screen correction method and device and readable storage medium

Abstract

The invention provides an LED display screen correction method and device and a readable storage medium, and belongs to the field of LED display screen correction. The technical problem that an existing LED display screen is low in correction precision is solved. According to the technical scheme, initial data, ink color data, brightness data and chromaticity data of LED modules are collected in an LED display screen factory, the initial data, the ink color data, the brightness data and the ink color data obtained after quantitative analysis are uploaded to a Flash storage unit, the LED modules are graded according to the ink color data obtained after quantitative analysis, and the LED modules are stored in the Flash storage unit. The LED modules of the same gear are placed together and correspondingly marked, the same LED display screen is built through the LED modules of the same gear, brightness data, chroma data and ink color data of the multiple LED modules for building the same LED display screen are read back, a correction coefficient is generated after analysis and processing are conducted through a fusion algorithm, the LED display screen is corrected based on the correction coefficient, and the correction result of the LED display screen is obtained. Generating a whole-screen coefficient by using the corrected data, uploading the whole-screen coefficient to a Flash storage unit and solidifying the whole-screen coefficient; the invention is applied to the LED display screen.

Description

Technical Field

[0001] The invention provides a method and equipment for correcting an LED display screen and a readable storage medium, belonging to the technical field of LED display screen correction. Background Art

[0002] LED display screens are usually composed of multiple LED modules, each of which is equipped with several LED light points. When the size of the LED display screen is large, the display color and brightness displayed by the LED display screen are uneven, and the display effect is poor. Therefore, the LED display screen needs to be calibrated. However, the existing LED display screen calibration method has the following problems: 1. Affected by environmental factors such as temperature, humidity, and light, the brightness and color of the LED display may also change, which will cause the display effect of the calibrated LED display to be different from the display effect of the LED display in the actual use environment, that is, the expected display effect cannot be achieved during actual use; 2. The existing LED display screen calibration is a single-board calibration technology, which focuses on the calibration of a single LED module. That is, after each LED module is calibrated, it is believed that the LED display screen composed of multiple calibrated LED modules will also present a good display effect as a whole. However, in actual operation, when multiple calibrated LED modules are spliced ​​together, the interaction between the two LED modules is not considered, so the special situations that may occur at the splicing point cannot be effectively handled. Summary of the invention

[0003] In order to solve the technical problem of low correction accuracy of the existing LED display screen, the present invention proposes a LED display screen correction method, a device and a readable storage medium.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for calibrating an LED display screen, comprising the following steps: Step S1: putting the LED module to be calibrated into a stable working state; Step S2: collecting ink color data of the LED module, performing quantitative analysis on the ink color data, and uploading the quantitatively analyzed ink color data to the Flash storage unit; Step S3: Collecting brightness data, chromaticity data and initial data of the LED module, and uploading the collected brightness data, chromaticity data and initial data to the Flash storage unit; Step S4: Divide the LED modules into different grades according to the ink color data after quantitative analysis, place the LED modules of the same grade together and mark them accordingly; Step S5: constructing an LED display screen, making the LED modules used in the same LED display screen in the same ink color level, and conducting a preliminary inspection of the LED display screen; Step S6: Read back the brightness data, chromaticity data and ink color data of multiple LED modules that build the same LED display screen, and generate correction coefficients after analysis and processing through a fusion algorithm; Step S7: calibrate the LED display screen based on the correction coefficient, generate the whole screen coefficient from the corrected data, upload the whole screen coefficient to the Flash storage unit and solidify it.

[0005] Furthermore, the working state described in step S1 includes the working temperature state, electrical performance state and luminous state; the method for stabilizing the working state of the LED module is: first preheating the LED module environment, then connecting the LED module to the power supply, and testing the LED module for obvious abnormal problems.

[0006] Furthermore, the process of quantitatively analyzing the ink color data in step S2 is as follows: Step S21: Dividing the LED module into a number of ink color levels according to a preset standard; Step S22: uploading the divided ink color gear data to the Flash storage unit.

[0007] Furthermore, before step S3, the display effect of the LED module is detected. The detection method is: the LED module is powered on, and whether there is any abnormality in the display of the LED module is detected through artificial vision. The detection content includes but is not limited to local bright spot problems, local dark spot problems, color deviation problems, edge blur problems and unnatural color transition problems.

[0008] Furthermore, in step S3, the instrument used to collect the brightness data of the LED module is a light gun; and the instrument used to collect the chromaticity data of the LED module is a camera.

[0009] Further, the preliminary verification in step S5 includes the following steps: Step S51: Checking the Flash storage unit of the LED display screen to ensure the normal operation of the Flash storage unit; Step S52: read back and analyze the basic data, brightness data, chromaticity data and ink color data after quantitative analysis in the Flash storage unit to evaluate their potential impact on the luminous performance of the lamp beads.

[0010] Furthermore, in step S7, the correction coefficient is generated by calculating the mean of the plurality of brightness data and the mean of the plurality of chromaticity data, performing data fusion and processing; The correction coefficient includes a brightness compensation value and a chromaticity correction value.

[0011] Furthermore, the method for calibrating the LED display screen in step S8 is zone calibration, which divides the LED display screen into several zones and calibrates each zone one by one to ensure that each zone achieves the expected display effect.

[0012] An LED display screen calibration device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to implement the above method steps when executing the computer program.

[0013] A readable storage medium stores a computer program, and the computer program implements the above method steps when executed by a processor.

[0014] The beneficial effects of the present invention compared with the prior art are as follows: 1. The present invention collects the brightness data and chromaticity data of the LED modules before assembling them into an LED display screen, and then reads back the brightness data and chromaticity data of the LED modules on the LED display screen to generate correction coefficients. This dual data processing method can more accurately correct the brightness difference and chromaticity difference of each LED module. Compared with traditional LED correction technology, it can effectively reduce the brightness and chromaticity unevenness caused by factors such as the manufacturing process of the LED modules and the characteristics of LED lamp beads, so that the brightness of each area of ​​the LED display screen is more uniform and the color display is more accurate, which greatly improves the display quality of the entire LED display screen; 2. Divide the LED modules into grades according to the ink color data after quantitative analysis, and read the ink color data of the LED display. When the ink color levels of the LED modules constituting the LED display are inconsistent, further screening and adjustment are made to ensure that the LED modules constituting the same LED display are in the same ink color level, which can ensure the ink color consistency of the LED display in the black screen state. Especially for scenes that require high-quality black display, such as high-end cinemas, professional stage backgrounds or night scene billboards, it can provide a deeper and more uniform black background, and enhance the visual effect of the entire screen of the LED display; 3. The LED display screen correction method of the present invention collects the brightness data, chromaticity data and ink color data of the LED modules in the factory, and then reads back the brightness data, chromaticity data and ink color data of the LED modules constituting the LED display screen to generate correction coefficients to correct the display effect of the LED display screen. Compared with the traditional method of building an LED display screen, it is not necessary to strictly assemble the LED display screen in a specific order or matching characteristics, which improves the versatility of the LED modules and the flexibility of building the LED display screen, thereby speeding up the construction progress of the LED display screen and reducing the installation cost; 4. Before building the LED display screen, data collection is performed on the LED modules. By putting the data collection link in front, the LED display screen can be built and the display effect of the LED display screen can be corrected in a targeted manner. The brightness data, chromaticity data and ink color data collected in the factory are used to generate correction coefficients through a fusion algorithm. Compared with the traditional method of collecting LED module data and correcting LED modules one by one on the site of building the LED display screen, the correction accuracy is higher, which helps to improve the production efficiency and quality of the LED display screen, and can automate and batch produce the LED display screen, reduce the situation of production tail orders, and be more economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 This is a flow chart of collecting LED module data in the factory in the LED display screen calibration method of the present invention; Figure 2 This is a flow chart of the whole-screen correction of the LED display screen of the present invention. DETAILED DESCRIPTION

[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate relative positions or positional relationships, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0018] like Figure 1 to Figure 2 As shown, the present invention provides a method for correcting an LED display screen, comprising the following steps: Step S1: Make the LED module to be calibrated in a stable working state, which includes the working temperature state, electrical performance state and light emitting state. Specifically: Step S11: Preheat the LED module for 3 to 5 minutes to allow the internal components and circuits of the LED module to reach a relatively stable operating temperature. Because temperature has a significant impact on the luminous characteristics of the LED module, in a low temperature environment, the starting voltage of the LED module increases and the luminous efficiency decreases. Preheating can reduce the calibration error caused by temperature differences and ensure the accuracy and reliability of subsequent data collection; Step S12: Turn on the power of the LED module for at least 1 minute, so that the components and circuits inside the LED module can achieve relatively stable electrical performance and luminous state. In the early stage of power-on, the luminous intensity and color of the LED module will have slight fluctuations. After a period of continuous power-on, the LED module can reach a relatively stable working state to ensure the accuracy of subsequent data collection. At the same time, it can detect whether the LED module has obvious electrical connection problems and abnormal light emission of the lamp beads, so as to deal with them in time, such as dead lights, flickering lights, etc.

[0019] Step S2: Collect the ink color data of the LED module and conduct quantitative analysis on it, and upload the quantitatively analyzed ink color data to the Flash storage unit. The process of quantitative analysis of ink color data is as follows: Step S21: Divide multiple LED modules into several ink color levels according to a preset standard; since different batches of LED modules may have differences in ink color presentation, the ink color data can be collected for quantitative analysis, and the modules can be divided into different levels according to the collected ink color data and the preset standards, so as to provide a basis for the subsequent assembly of the LED display screen. In this embodiment, the ink color level includes three levels: A level, B level, and C level. If the collected ink color data falls within the ink color data range of A level, the ink color data of the LED module is classified as A level. If the collected ink color data falls within the ink color data range of B level, the ink color data of the LED module is classified as B level. If the collected ink color data falls within the ink color data range of C level, the ink color data of the LED module is classified as C level.

[0020] Step S22: Upload the divided ink color gear data to the Flash storage unit, and establish a link between the ink color gear data and the LED module, so that the LED module can obtain the ink color gear data of the LED module during subsequent transportation, storage and LED display assembly. When assembling a large LED display, its control system can intelligently adjust its brightness and chromaticity compensation value according to the ink color gear data of the LED module to ensure the color uniformity of the LED display.

[0021] Step S3: Collect the brightness data, chromaticity data and initial data of the LED module, and upload the collected brightness data, chromaticity data and initial data to the Flash storage unit. Specifically: Use a light gun to collect the brightness data of the LED module. By measuring multiple points at different positions of the LED module, the brightness data information can be obtained to provide a basis for the subsequent evaluation of the display brightness uniformity of the LED module and the determination of the brightness compensation value. The camera collects the chromaticity data of the LED module and measures the color coordinate values ​​of the LED module in different color channels (red, green, and blue) to ensure the accuracy and vividness of the color when the LED module displays the color image or video, and avoid color distortion. Initial data includes but is not limited to the initial electrical characteristics of the lamp beads, initial luminous characteristics, component missing data and appearance damage data Step S4: Divide the LED modules into different grades according to the ink color data after quantitative analysis, place the LED modules of the same grade together and mark them accordingly, and compile different labels for the LED modules of different grades to distinguish the LED modules of different grades. The content of the label includes but is not limited to the ink color grade, brightness data and chromaticity data.

[0022] Step S5: Build the LED display screen so that the LED modules used in the same LED display screen are in the same ink color level, and conduct a preliminary inspection of the LED display screen. Combine LED modules with similar ink colors to improve the ink color consistency of the entire display screen, avoid obvious color block differences, and enhance the visual effect. That is, an LED display screen is composed of LED modules with the same level. The preliminary inspection includes the following steps: Step S61: Checking the Flash storage unit of the LED display screen to ensure the normal operation of the Flash storage unit; Step S62: Read back and analyze the initial data, brightness data, chromaticity data and ink color data after quantitative analysis in the Flash storage unit, analyze and process the parameters that affect the electrical performance of the lamp beads, and evaluate their potential impact on the luminous performance of the lamp beads. Specifically, reading back the initial data, ink color data, brightness data and chromaticity data of the LED modules that make up the LED display can provide a basic data basis for the LED display calibration work, and fully understand the initial state and performance parameters of the LED display. Detect whether the LED modules that make up the LED display are in the same ink color gear to avoid obvious color block differences on the LED display, and ensure the effectiveness and accuracy of subsequent calibration work. Parameters that affect the electrical performance of lamp beads include but are not limited to the range of resistance and capacitance.

[0023] Step S6: Read back the brightness data, chromaticity data and ink color data of multiple LED modules that build the same LED display screen, and generate correction coefficients after analysis and processing through a fusion algorithm. Specifically, the correction coefficients are generated after data fusion and processing by calculating the mean of multiple brightness data and the mean of multiple chromaticity data. The correction coefficients are personalized adjustment parameters for each lamp bead or specific area, including brightness compensation values ​​and chromaticity correction values, which provide a basis for accurate correction of the luminous characteristics of the LED display screen.

[0024] Step S7: calibrate the LED display screen based on the correction coefficient, generate the whole screen coefficient from the corrected data, upload the whole screen coefficient to the Flash storage unit and solidify it.

[0025] The method for calibrating the LED display is partition calibration, which divides the LED display into several areas and calibrates each area one by one to ensure that each area achieves the expected display effect. The specific steps are: Step S71: Apply the generated correction coefficient to a certain area of ​​the LED display screen for correction work, which can quickly test the effectiveness of the correction coefficient and find possible problems in time. The correction coefficient can be fine-tuned before the entire LED display screen is calibrated to improve the success rate and efficiency of the correction. The existing problems include but are not limited to the appearance of new bright and dark lines or color anomalies due to over- or under-correction; Step S72: Use a camera to take a picture of the display effect of the above-mentioned corrected area, and upload the taken picture to the host computer, so that the technicians can compare the difference before and after the correction and evaluate the correction effect from a visual perspective. At the same time, the taken picture is archived for subsequent analysis and tracing; the camera in this embodiment can use the camera function in a mobile communication device, such as the camera function in a mobile phone; Step S73: Apply the generated correction coefficient to another area of ​​the LED display screen for correction, and repeat the above process to ensure that all parts of the entire LED display screen can be accurately calibrated to achieve a high consistency of the entire screen display effect.

[0026] The whole screen coefficient is the final parameter set that comprehensively considers each area on the LED display after correction. It is uploaded to the Flash storage unit of the LED display and solidified. The solidified whole screen coefficient can continuously correct the display effect of the LED display, ensuring that the LED display can present a high-quality picture every time it is lit.

[0027] Before collecting the brightness data, chromaticity data and initial data of the LED module in step S3, the display effect of the LED module is first detected. The detection method is: connect the LED module to the power supply, and further detect whether there is any abnormality in the display of the LED module through artificial vision, so as to adjust or replace the abnormal LED module in time. The detection content includes but is not limited to local bright spot problems, local dark spot problems, color deviation problems, edge blur problems that may appear when certain special patterns or texts are displayed, and unnatural color transition problems.

[0028] An LED display screen calibration device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to implement the above method steps when executing the computer program.

[0029] A readable storage medium stores a computer program, and the computer program implements the above method steps when executed by a processor.

[0030] Regarding the specific structure of the present invention, it should be noted that the connection relationship between the various component modules adopted in the present invention is definite and feasible. Except for special instructions in the embodiments, the specific connection relationship can bring about corresponding technical effects, and solve the technical problems raised by the present invention without relying on the execution of corresponding software programs. The components, modules, models of specific components, the connection methods between each other, and the conventional use methods and expected technical effects brought about by the above-mentioned technical features, except for specific instructions, all belong to the disclosed contents in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by technical personnel in this field before the application date, or belong to the existing technologies such as conventional technologies and common knowledge in this field, and there is no need to elaborate, so that the technical solution provided in this case is clear, complete, and feasible, and the corresponding physical products can be reproduced or obtained according to the technical means.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calibrating an LED display screen, characterized in that: The following steps are involved: Step S1: putting the LED module to be calibrated into a stable working state; Step S2: collecting ink color data of the LED module, performing quantitative analysis on the ink color data, and uploading the quantitatively analyzed ink color data to the Flash storage unit; Step S3: Collecting brightness data, chromaticity data and initial data of the LED module, and uploading the collected brightness data, chromaticity data and initial data to the Flash storage unit; Step S4: Divide the LED modules into different grades according to the ink color data after quantitative analysis, place the LED modules of the same ink color grade together and mark them accordingly; Step S5: constructing an LED display screen, making the LED modules used in the same LED display screen in the same ink color level, and conducting a preliminary inspection of the LED display screen; Step S6: Read back the brightness data, chromaticity data and ink color data of multiple LED modules that build the same LED display screen, and generate correction coefficients after analysis and processing through a fusion algorithm; Step S7: calibrate the LED display screen based on the correction coefficient, generate the whole screen coefficient from the corrected data, upload the whole screen coefficient to the Flash storage unit and solidify it.

2. A LED display screen correction method according to claim 1, characterized in that: The working state described in step S1 includes the working temperature state, electrical performance state and luminous state; the method for stabilizing the working state of the LED module is: first preheating the LED module environment, then connecting the LED module to the power supply, and testing the LED module for obvious abnormal problems.

3. The LED display screen correction method according to claim 1, characterized in that: The process of quantitative analysis of ink color data in step S2 is as follows: Step S21: Dividing the LED module into a number of ink color levels according to a preset standard; Step S22: uploading the divided ink color gear data to the Flash storage unit.

4. The LED display screen correction method according to claim 1, characterized in that: Before step S3, the display effect of the LED module is first detected. The detection method is: connect the LED module to the power supply, and use artificial vision to detect whether there is any abnormality in the display of the LED module. The detection content includes but is not limited to local bright spot problems, local dark spot problems, color deviation problems, edge blur problems and unnatural color transition problems.

5. The LED display screen correction method according to claim 1, characterized in that: In the step S3, the instrument used to collect the brightness data of the LED module is a light gun; the instrument used to collect the chromaticity data of the LED module is a camera.

6. The LED display screen correction method according to claim 1, characterized in that: The preliminary verification in step S5 includes the following steps: Step S51: Checking the Flash storage unit of the LED display screen to ensure the normal operation of the Flash storage unit; Step S52: read back and analyze the basic data, brightness data, chromaticity data and ink color data after quantitative analysis in the Flash storage unit to evaluate their potential impact on the luminous performance of the lamp beads.

7. The LED display screen correction method according to claim 1, characterized in that: In step S7, the correction coefficient is generated by calculating the mean of the plurality of brightness data and the mean of the plurality of chromaticity data and performing data fusion processing; The correction coefficient includes a brightness compensation value and a chromaticity correction value.

8. The LED display screen correction method according to claim 1, characterized in that: The method for calibrating the LED display screen in step S8 is zone calibration, which divides the LED display screen into several zones and calibrates each zone one by one to ensure that each zone achieves the expected display effect.

9. An LED display screen calibration device, characterized in that: The method comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to implement the method steps as claimed in any one of claims 1 to 8 when executing the computer program.

10. A readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program is executed by a processor, the method steps according to any one of claims 1 to 8 are implemented.

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