Correction method of LED display screen and corresponding correction device

Abstract

The embodiment of the invention relates to the field of display screens, and discloses a correction method of an LED display screen and a corresponding correction device.The correction method is applied to the LED display screen displaying static pictures, at least one lamp panel is detached from the LED display screen in advance, and the correction method comprises the steps that the lamp panels are corrected, and current correction coefficients of all reference pixel points are obtained; determining a reference attribute value of each reference pixel point according to a picture required to be displayed by the lamp panel; and determining a whole screen correction coefficient of the whole LED display screen according to each reference attribute value and the corresponding current correction coefficient. On-site whole-screen correction is not needed, and only one or more sample lamp panels need to be corrected to obtain the pre-correction coefficient of each pixel point of the lamp panel; according to the static picture needing to be displayed by the LED display screen and the picture correspondingly displayed by the lamp panel, the attribute value of the pixel point serves as a link, the current correction coefficient can be converted into the whole-screen correction coefficient, and therefore the LED display screen is corrected according to the whole-screen correction coefficient.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of display screens, and in particular to a correction method for an LED display screen and a corresponding correction device. Background Art

[0002] Display screens have developed rapidly in recent years. LED (Light Emitting Diode) displays have spread across central squares and commercial buildings in various cities. LED displays are developing towards ultra-small pitch, ultra-large area, multi-function and intelligentization. In addition, there are more and more ultra-large screens, which puts higher requirements on the performance of display screens. Due to the discreteness of the LED light-emitting chip itself and the differences in the manufacturing process of LED display screens, the display screen will display unevenly. In order to make up for this defect, correction technology has emerged. Through brightness and chromaticity correction means, the full-screen brightness and chromaticity consistency of the LED display screen can be improved to obtain better picture quality expression.

[0003] Even if the LED display is calibrated before leaving the factory, the brightness of the LED chip will still decay after long-term use, and the ratio of brightness decay will change according to the brightness and time displayed by each chip. The higher the brightness during use, the more it decays, and the longer the use time, the more it decays. Different LED chip decays in different usage time and brightness, and eventually the brightness of the LED screen will decay.

[0004] Especially when the same static image is displayed on the LED screen for a long time, the overall brightness attenuation of the LED screen is not uniform. For example, when the LED screen displays the same static image for a long time, the high brightness parts of the image will attenuate severely, while the low brightness parts will attenuate less, resulting in obvious traces, which seriously affects the display effect of the display.

[0005] In the prior art, in order to solve the above-mentioned problems, the main method of on-site full-screen recalibration is adopted. This method requires the site to support calibration, which has high requirements for the site, and many usage scenarios cannot meet this requirement. If the site does not support calibration, the entire LED display needs to be disassembled and transferred to a calibrable scene for calibration. For large-screen LED display screens, it is mainly composed of multiple LED panel modules. Each LED panel module includes a box and a lamp board. The workload of disassembly and reinstallation is very large. Moreover, each lamp board includes many lamp beads. During the disassembly and installation process, it is easy to bump and cause the lamp beads to fall off. Summary of the invention

[0006] The embodiments of the present application provide a correction method for an LED display screen and a corresponding correction device to solve the problem that when the LED screen displays the same static image for a long time, it needs to be corrected according to the actual attenuation situation. On the one hand, the on-site correction requirements are high, and on the other hand, the method of transferring the correction after the entire screen is disassembled is labor-intensive and easily damages the lamp beads.

[0007] The purpose of the embodiment of the present invention is achieved through the following technical solutions:

[0008] In order to solve the above technical problems, in a first aspect, an embodiment of the present invention provides a correction method for an LED display screen, wherein the correction method is applied to an LED display screen that displays a static image, and at least one light board is removed from the LED display screen in advance. The correction method comprises:

[0009] Calibrate the light board to obtain the current calibration coefficient of each reference pixel point;

[0010] Determine the reference attribute value of each reference pixel point according to the picture to be displayed by the light board;

[0011] According to each reference property value and the corresponding current correction coefficient, the whole screen correction coefficient of the entire LED display is determined.

[0012] In some embodiments, when the LED light-emitting chip on the LED display screen is a monochrome light-emitting chip, the reference attribute value is a reference grayscale value;

[0013] Determining the entire screen correction coefficient of the entire LED display screen according to each reference attribute value and the corresponding current correction coefficient includes:

[0014] For each reference grayscale value, obtaining at least one reference pixel having the same reference grayscale value, and obtaining a current correction coefficient of the corresponding reference pixel;

[0015] Processing the current correction coefficient corresponding to the same reference grayscale value to obtain the adjustment coefficient corresponding to the reference grayscale value;

[0016] Generate a lookup table according to each reference grayscale value and the corresponding adjustment coefficient;

[0017] The whole-screen correction coefficient is obtained according to the static picture displayed by the LED display screen and the lookup table.

[0018] In some embodiments, obtaining the whole screen correction coefficient according to the static picture displayed by the LED display screen and the lookup table includes:

[0019] Determine the actual grayscale value of each actual pixel point of the entire screen according to the static picture displayed by the LED display screen;

[0020] The adjustment coefficient corresponding to the actual grayscale value is obtained according to the lookup table, and the whole screen correction coefficient is obtained according to the corresponding adjustment coefficient.

[0021] In some embodiments, obtaining the whole screen correction coefficient according to the corresponding adjustment coefficient includes:

[0022] Determining whether the LED display screen has a historical correction coefficient;

[0023] If the LED display screen has a historical correction coefficient, the whole screen correction coefficient is obtained according to the historical correction coefficient corresponding to each actual pixel point and the corresponding adjustment coefficient;

[0024] If the LED display screen does not have a historical correction coefficient, the adjustment coefficient corresponding to each actual pixel point is used as the whole-screen correction coefficient.

[0025] In some embodiments, the historical correction coefficient includes a historical brightness correction coefficient and / or a historical brightness and chromaticity correction coefficient; the adjustment coefficient includes a brightness adjustment coefficient and / or a brightness and chromaticity adjustment coefficient; the whole screen correction coefficient includes a whole screen brightness correction coefficient and / or a whole screen brightness and chromaticity correction coefficient;

[0026] The whole screen correction coefficient is obtained according to the historical correction coefficient corresponding to each actual pixel point and the corresponding adjustment coefficient, including:

[0027] If it is brightness correction, the historical brightness correction coefficient and the corresponding brightness adjustment coefficient corresponding to each actual pixel are converted according to the storage format of brightness and chromaticity, and the converted correction coefficient and adjustment coefficient are matrix multiplied to obtain the brightness correction coefficient of the entire screen;

[0028] and / or;

[0029] If it is brightness and chromaticity correction, the historical brightness and chromaticity correction coefficients corresponding to each actual pixel and the corresponding brightness and chromaticity adjustment coefficients are matrix multiplied to obtain the brightness and chromaticity correction coefficients of the entire screen.

[0030] In some embodiments, the processing of the current correction coefficient corresponding to the same reference gray value to obtain the adjustment coefficient corresponding to the reference gray value includes:

[0031] Perform a sum operation on the current correction coefficients corresponding to the same reference gray value to obtain the total coefficient;

[0032] The sum of the coefficients is divided by the sum of the number of reference pixels corresponding to the same reference gray value to obtain the adjustment coefficient corresponding to the reference gray value;

[0033] or,

[0034] The average value is calculated in a weighted manner, specifically: the correction coefficients are arranged according to their sizes, and the number of correction coefficients in each interval is determined. The larger the proportion of the correction coefficient, the greater the weight of the correction coefficient corresponding to the interval, and the smaller the proportion of the correction coefficient, the smaller the weight of the correction coefficient corresponding to the interval.

[0035] In some embodiments, generating a lookup table according to each reference grayscale value and a corresponding adjustment coefficient includes:

[0036] Obtaining a grayscale value list corresponding to the static picture;

[0037] If the reference grayscale value does not completely cover the grayscale value list, the adjustment coefficients of other grayscale values ​​are calculated by linear interpolation to obtain a lookup table that can cover the grayscale value list.

[0038] In some embodiments, when the LED light-emitting chip on the LED display screen is a multi-color light-emitting chip, the reference attribute value is a reference equivalent power;

[0039] Determining the reference attribute value of each reference pixel point according to the picture to be displayed by the light board includes:

[0040] Determine multiple monochrome gamma values ​​of reference pixel points according to the picture to be displayed by the light board;

[0041] According to the multiple monochromatic gamma values ​​and the corresponding driving current ratios, the reference equivalent power of the reference pixel is obtained.

[0042] In some embodiments, determining the entire screen correction coefficient of the entire LED display screen according to each reference property value and the corresponding current correction coefficient includes:

[0043] Obtain the equivalent power range corresponding to the LED display screen displaying a static image, where:

[0044] According to a preset division method, the equivalent power range is divided into multiple equivalent power intervals;

[0045] Obtain at least one reference pixel point that falls within the same equivalent power interval, and obtain a current correction coefficient of the corresponding reference pixel point; process the current correction coefficient corresponding to the same equivalent power interval to obtain an adjustment coefficient corresponding to the equivalent power interval;

[0046] Generate a lookup table according to each equivalent power interval and the corresponding adjustment coefficient;

[0047] The whole-screen correction coefficient is obtained according to the static picture displayed by the LED display screen and the lookup table.

[0048] In some embodiments, obtaining the whole screen correction coefficient according to the static picture displayed by the LED display screen and the lookup table includes:

[0049] Determine the actual equivalent power of each actual pixel point of the entire screen according to the static picture displayed by the LED display screen;

[0050] The adjustment coefficient corresponding to the actual equivalent power is obtained according to the lookup table, and the whole-screen correction coefficient is obtained according to the corresponding adjustment coefficient.

[0051] In order to solve the above technical problems, in a second aspect, a correction device for an LED display screen is provided, wherein the correction system is used to implement the correction method described in the first aspect, and the correction system includes an image acquisition module, a first correction module, a calculation module, and a second correction module;

[0052] The image acquisition module is used to acquire the original image of the light board;

[0053] The first correction module is used to correct the light board according to the original image to obtain the current correction coefficient of each reference pixel point;

[0054] The calculation module is used to determine the reference attribute value of each reference pixel point according to the picture that the light board needs to display;

[0055] The second correction module is used to determine the entire screen correction coefficient of the entire LED display screen according to each reference attribute value and the corresponding current correction coefficient.

[0056] In order to solve the above technical problems, in a third aspect, an embodiment of the present invention provides a correction device for an LED display screen, comprising:

[0057] at least one processor; and,

[0058] a memory communicatively connected to the at least one processor; wherein,

[0059] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the correction method described in the first aspect.

[0060] To solve the above technical problems, in a fourth aspect, an embodiment of the present invention provides a non-volatile computer storage medium, wherein the computer storage medium stores computer executable instructions, which are executed by one or more processors to complete the correction method described in the first aspect.

[0061] Compared with the prior art, the present invention has the following beneficial effects:

[0062] There is no need to calibrate the entire screen on site. You only need to calibrate one or more sample light boards to obtain the previous correction coefficients of each pixel of the light board. Based on the static image that the LED display needs to display and the image corresponding to the light board, the attribute value of the pixel point is used as a link to convert the current correction coefficient into the entire screen correction coefficient, so that the LED display can be calibrated according to the entire screen correction coefficient, which greatly reduces labor costs and risks brought by disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements / modules and steps with the same reference numerals in the drawings are represented as similar elements / modules and steps. Unless otherwise specified, the figures in the drawings do not constitute proportional limitations.

[0064] Figure 1 It is a structural schematic diagram of an LED display screen provided by an embodiment of the present invention;

[0065] Figure 2 It is a display schematic diagram of an LED display screen displaying a uniform static picture for a long time provided by an embodiment of the present invention;

[0066] Figure 3 is a schematic diagram of a disassembled lamp board and a display screen on the lamp board provided by an embodiment of the present invention;

[0067] Figure 4 It is a flow chart of a correction method of an LED display screen provided by an embodiment of the present invention;

[0068] Figure 5 is a schematic diagram of a structure for calibrating a light board provided by an embodiment of the present invention;

[0069] Figure 6 The embodiment of the present invention provides Figure 4 A specific flow chart of step 12 in FIG.

[0070] Figure 7 is a schematic diagram of the coordinate position of the disassembled light board relative to the LED display screen provided by an embodiment of the present invention;

[0071] Figure 8 The embodiment of the present invention provides Figure 4 Specific flow diagram of step 11 in FIG.

[0072] Fig. 9 The embodiment of the present invention provides Figure 4 Another specific flow diagram of step 12;

[0073] Fig.10It is a structural schematic diagram of a correction device for an LED display screen provided by an embodiment of the present invention;

[0074] Fig.11 It is a structural schematic diagram of another LED display screen correction device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0075] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0076] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0077] It should be noted that, if there is no conflict, the various features in the embodiments of the present invention can be combined with each other, and all are within the scope of protection of this application. In addition, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a different order than the module division in the device or the order in the flow chart.

[0078] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0079] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0080] When the same image is displayed on an LED screen for a long time, the overall brightness attenuation of the LED screen is not uniform. For example, when the same static image is displayed on an LED screen for a long time, the high brightness areas of the image will attenuate severely, while the low brightness areas will attenuate less, resulting in obvious traces, which will seriously affect the display effect of the display.

[0081] In the prior art, in order to solve the above-mentioned problems, the main method of on-site full-screen recalibration is adopted. This method requires the site to support calibration, which has high requirements for the site, and many usage scenarios cannot meet this requirement. If the site does not support calibration, the entire LED display needs to be disassembled and transferred to a calibrable scene for calibration. For large-screen LED display screens, it is mainly composed of multiple LED panel modules. Each LED panel module includes a box and a lamp board. The workload of disassembly and reinstallation is very large. Moreover, each lamp board includes many lamp beads. During the disassembly and installation process, it is easy to bump and cause the lamp beads to fall off.

[0082] Embodiment 1:

[0083] In order to more clearly understand the technical problem to be solved by this embodiment, first Figure 1 and Figure 2 The application scenario targeted by this embodiment is described. This embodiment is more suitable for large-area LED display screens, such as LED display screens composed of multiple light panels. In actual application scenarios, seamless splicing technology can be used to splice multiple light panels together in a preset splicing method to form an LED display screen, wherein seamless splicing technology is a special and relatively demanding projection display application that can achieve the fusion of multiple screen images and minimize the splicing gap to the point of complete overlap. The use of seamless LED splicing technology can improve the screen resolution in a smaller area, ensure the texture of the picture, and meet the needs of users for close viewing.

[0084] by Figure 1 For example, Figure 1 The structure diagram of an LED display screen is shown. The LED display screen includes 16 light boards, specifically light boards A11 to A44. Any light board can be removed. Of course, in other embodiments, the LED display screen may include 2, 3, 6 or more light boards, and the number of light boards is not specifically limited. Different light boards can be spliced ​​horizontally and / or vertically. For example, 16 light boards can be spliced ​​horizontally and / or vertically. Figure 1 The manner shown forms a matrix-shaped splicing; or, it can also form a 2-row 8-column splicing; or, it can even form a 1-row 16-column splicing. The specific form of the splicing is not specifically limited.

[0085] It should be noted here that for the convenience of explanation, Figure 1 and Figure 2 Each lamp board is marked with a number (A11-A44). During normal use of the LED display, there is no need to display the number.

[0086] In actual use, if the LED display screen displays the same static image for a long time, the high brightness parts of the image will be severely attenuated, while the low brightness parts will be attenuated lightly, and obvious traces will appear, which will seriously affect the display effect of the display screen. The static image can be information that can be displayed, such as text and pictures. Figure 2 For example, when the LED display screen displays "Scientific Prevention and Precision Policy" for a long time, the brightness of the display in different areas is different, and there will be different degrees of attenuation. For example, the attenuation of light boards A22 and A32 is more serious, while the attenuation of A11, A14, and A44 is slightly lighter.

[0087] In the prior art, the LED display screen can be calibrated on site, but the on-site calibration has high requirements and cannot meet this requirement in many usage scenarios. If the calibration is not supported on site, the entire LED display screen needs to be disassembled and transferred to a calibrable scene for calibration. In this way, the workload of disassembly and reinstallation is very large. In addition, each light board includes many lamp beads, which are easy to bump and fall off during the disassembly and installation process.

[0088] In order to solve the aforementioned problem, the present embodiment provides a calibration method for an LED display screen, which is applied to an LED display screen that displays a static image, and at least one lamp board is removed from the LED display screen in advance. In actual application scenarios, a suitable lamp board can be selected according to the attenuation of each lamp board, and the lamp board can be removed as a calibration object, and then the calibration result of the lamp board can be mapped to the entire screen. For example, at least one lamp board with severe attenuation can be removed and sent back to the manufacturer for calibration, or the lamp board can be used for calibration in other environments where indoor calibration can be performed. Of course, the disassembled lamp board can be replaced with a spare part, which does not affect the normal use of the screen.

[0089] by Figure 2 and Figure 3 For example, in Figure 2 If the attenuation of the area corresponding to the lamp board A22 and the lamp board A32 is relatively serious, the lamp board A22 and the lamp board A32 are disassembled to calibrate the lamp board A22 and the lamp board A32, and then the calibration result of the lamp board is mapped to the entire screen.

[0090] The aforementioned static picture refers to displaying the same picture for a long time, and the display method of the static picture is not specifically limited.

[0091] The LED display screen can be a single-primary color display screen, that is, the LED display screen displays a single color (e.g., red, green, and yellow, etc.). The LED display screen can also be a dual-primary color display screen, for example, a red and green dual-primary color display screen, 256 levels of gray, and can display 65,536 colors. The LED display screen can be a full-color display screen, for example, a red, green, and blue three-primary color display screen, and a full-color display screen with 256 levels of gray can display more than 16 million colors.

[0092] Combine the following Figure 4 , specifically describe the specific implementation process of the correction method, the correction method specifically includes:

[0093] Step 10: Calibrate the light board to obtain the current calibration coefficient of each reference pixel point.

[0094] Among them, the reference pixel point refers to the pixel point on the light board, a multi-color LED light-emitting chip corresponds to one pixel point, or multiple single-color LED light-emitting chips correspond to one pixel point, or one single-color LED light-emitting chip corresponds to one pixel point.

[0095] by Figure 5 For example, in actual use, the image acquisition module is used to collect the source image of the light board and send it to the correction module. The correction module obtains the current correction coefficient of each reference pixel point according to the source image and the expected image.

[0096] Among them, the image acquisition module can be an industrial camera, an area array camera, etc., which is used to image the light board and obtain the brightness and color of each LED light-emitting chip. The correction module generates a unique set of correction coefficients for each pixel, and then sends the correction coefficients to the control system of the display screen. When the control system is running, it performs high-speed multiplication operations with the correction coefficients for the image content of each pixel.

[0097] The spacing of LED display screens is getting smaller and smaller, and the resolution is getting larger and larger, but the resolution of industrial cameras is limited. In order to meet the requirements of accurately measuring the brightness and chromaticity values ​​of LEDs, it is necessary to limit the screen resolution of the industrial camera for a single acquisition, so the point acquisition correction method came into being. Among them, the principle of the point acquisition correction method is to divide the area to be corrected into many cells of the same size, and then collect the LED light points at the same position in the cells one by one in a certain order. Then it is necessary to take the number of cell rows multiplied by the number of cell columns to complete the chromaticity acquisition of all the same color LED lights in the entire area to be corrected. The advantage of this method is that the industrial camera has a large measurement working angle, the camera lens angle does not need to be frequently moved during the correction process, and a lot of correction time is saved.

[0098] In this embodiment, if the resolution of the light board is higher than the resolution rate of the industrial camera, the current correction coefficient of each pixel can be obtained in a point-by-point correction manner. Specifically, the light board can be divided into a large number of cells of the same size, and then the LED light points (i.e., pixel points) at the same position in the cell are collected one by one in a certain order to obtain the correction coefficient of each pixel.

[0099] Step 11: Determine the reference attribute value of each reference pixel point according to the image that the light board needs to display.

[0100] In this embodiment, the original calibration state of the lamp board is maintained for calibration, that is, when there is no calibration data, the calibration is performed after the calibration is turned off; when there is calibration data, the calibration needs to be performed after the calibration is turned on.

[0101] by Figure 3 For example, the picture displayed by light board 22 and light board 32 is a part of the static picture. The position of the part of the picture on the light board and the reference attribute value corresponding to the part of the picture are obtained, and then the reference attribute value of each reference pixel point is obtained.

[0102] Optionally, when the LED light-emitting chip on the LED display screen is a monochrome light-emitting chip, the reference attribute value is a reference grayscale value, for example, the LED light-emitting chip is an R light-emitting chip, the LED light-emitting chip is a G light-emitting chip, and the LED light-emitting chip is a B light-emitting chip, and the grayscale range corresponding to each light-emitting chip is [0, 255]. The reference grayscale value of each pixel is determined according to the image to be displayed by each reference pixel. That is, according to step 10 and step 11, the current correction coefficient and reference grayscale value of each reference pixel can be determined.

[0103] Optionally, when the LED light-emitting chip on the LED display screen is a multi-color light-emitting chip, the reference attribute value is the reference equivalent power; for example, the LED light-emitting chip is a multi-color light-emitting chip of R, G, and B. Since the R lamp, the G lamp, and the B lamp are integrated into one light-emitting chip, when the R lamp and the G lamp are on, the temperature of the B lamp will also rise, affecting the light emission. Therefore, in this embodiment, the reference equivalent power is used as the reference attribute value. Among them, the reference equivalent power of the reference pixel point is obtained according to multiple single-color Gamma values ​​and corresponding driving current ratios. For example, the current color of a light-emitting chip is (R0, G0, B0), and the reference equivalent power calculation formula is: Gamma (R0) * I (R0) * U + Gamma (G0) * I (G0) * U + Gamma (B0) * I (B0) * U. Among them, U is the voltage value, R0, G0, B0 are the corresponding grayscale values, I(R0), I(G0) and I(B0) are the driving current ratios, Gamma(R0), Gamma(G0), Gamma(B0) can be obtained based on the Gamma curve. Each color of light has a corresponding Gamma curve, and the Gamma curve reflects the corresponding relationship between the grayscale value and the Gamma value.

[0104] Step 12: Determine the entire screen correction coefficient of the entire LED display screen based on each reference attribute value and the corresponding current correction coefficient.

[0105] Based on the disassembled light board, the correspondence between the baseline attribute value and the current correction coefficient is obtained, and then a corresponding lookup table is generated based on the baseline attribute value and the current correction coefficient to obtain the correspondence between the attribute value and the correction coefficient. The attribute value of the actual pixel point of the entire screen is determined according to the static picture displayed by the LED display screen, and then the correction coefficient corresponding to the attribute value is determined based on the lookup table, so as to map the current correction coefficient of the light board to the entire screen.

[0106] In this embodiment, there is no need to perform on-site calibration of the entire screen. Only one or more sample lamp boards need to be calibrated to obtain the previous correction coefficient of each pixel of the lamp board. According to the static image that the LED display needs to display and the corresponding image displayed by the lamp board, the attribute value of the pixel point is used as a link to convert the current correction coefficient into the entire screen correction coefficient, so that the LED display can be calibrated according to the entire screen correction coefficient, which greatly reduces the labor cost and the risk brought by disassembly and assembly.

[0107] Embodiment 2:

[0108] Different from the first embodiment, the present embodiment specifically defines the type of LED light emitting chip, and uses the light emitting chip to illustrate the specific calibration process.

[0109] In this embodiment, when the LED light-emitting chips on the LED display screen are monochrome light-emitting chips, at least one monochrome light-emitting chip forms a pixel point, and the reference attribute value is a reference grayscale value. Figure 6 The specific implementation process of step 12 in Example 1 includes:

[0110] Step 121 ′: for each reference gray value, obtain at least one reference pixel point having the same reference gray value, and obtain a current correction coefficient of the corresponding reference pixel point.

[0111] The grayscale values ​​of each reference pixel on the light board may be equal or unequal. In the present embodiment, the reference pixel points with equal grayscale values ​​are grouped together, and then at least one current correction coefficient corresponding to the grayscale value is grouped together, and then at least one current correction coefficient is processed to obtain the adjustment coefficient corresponding to the grayscale value.

[0112] like Figure 7 , the position of the light board A22 in the LED display screen is (x1, y1, w1, h1), where (x1, y1) is the coordinate of the first pixel point in the light board A22, w1 is the width of the light board, h1 is the height of the light board, and (x1, y1, w1, h1) reflects the position of the light board A22 on the entire LED display screen and the size of the space it occupies.

[0113] For example, the image displayed by the light board A22 is also located at (x1, y1, w1, h1) relative to the entire static image displayed by the corresponding LED display. The grayscale values ​​of all points in the image displayed by the light board are obtained, and then the grayscale values ​​are associated with the correction coefficients according to the positions of the pixels. Assume that the current correction coefficient of the pixel point (x1, y1) is (R(x1, y1), G(x1, y1), B(x1, y1)), and the grayscale value of the pixel point (x1, y1) in the corresponding image is (Rs(x1, y1), Gs(x1, y1), Bs(x1, y1)), where R(x1, y1) corresponds to Rs(x1, y1), G(x1, y1) corresponds to Gs(x1, y1), and B(x1, y1) corresponds to Bs(x1, y1). ; The current correction coefficient of the pixel point (xn,yn) is (R(xn,yn), G(xn,yn), B(xn,yn)), and the grayscale value in the corresponding image of the pixel point (xn,yn) is (Rs(xn,yn), Gs(xn,yn), Bs(xn,yn)), where R(xn,yn) corresponds to Rs(xn,yn), G(xn,yn) corresponds to Gs(xn,yn), and B(xn,yn) corresponds to Bs(xn,yn).

[0114] Step 122': Process the current correction coefficients corresponding to the same reference gray value to obtain the adjustment coefficient corresponding to the reference gray value.

[0115] A specific processing method can be to calculate the average value. Specifically: perform a summation operation on the current correction coefficients corresponding to the same reference gray value to obtain the total coefficient; divide the total coefficient by the sum of the number of reference pixel points corresponding to the same reference gray value to obtain the adjustment coefficient corresponding to the reference gray value.

[0116] Continuing with the previous example, put together all the correction coefficients R(x1, y1), R(x2, y2),... corresponding to the gray level Rs = 0. Take the average value, and we denote the adjustment coefficient when the gray level is Rs = 0.

[0117] Similarly, we can generate the adjustment coefficients corresponding to Rs from 0 to 255, and then obtain the lookup table. For some Rs values without corresponding adjustment coefficients, we can calculate them using the linear interpolation algorithm.

[0118] Generate the lookup tables for Gs and Bs from 0 to 255 in the aforementioned manner.

[0119] Another specific processing method can be: calculate the average value in a weighted manner. Specifically, arrange the correction coefficients according to their magnitudes, determine the number of correction coefficients in each interval, and the correction coefficients corresponding to the interval with a larger quantity ratio have a greater weight, while the correction coefficients corresponding to the interval with a smaller quantity ratio have a smaller weight. For example, there are 10 pixel points with a gray value of 10, and the correction coefficients of these 10 pixel points are arranged from largest to smallest as [S1, S2... S10]. Among them, S1, S2, and S3 are in the first interval, S4, S5, S6, S7, S8 are in the second interval, and S9 and S10 are in the third interval. Then the second interval has the largest number, the first interval is the second, and the third interval has the smallest number. We can set the weight of S1, S2, and S3 as q1; the weight of S4, S5, S6, S7, S8 as q2; and the weight of S9 and S10 as q3, where q3 < q1 < q2 and q3 + q1 + q2 = 1, and then calculate the weighted average value. In this way, the influence of individual special decaying lamps on the whole can be eliminated.

[0120] Step 123': Generate a lookup table based on each reference gray value and the corresponding adjustment coefficient.

[0121] In this embodiment, the grayscale value of the disassembled lamp board cannot cover the grayscale value of the entire LED display screen, and the adjustment coefficients of other grayscale values ​​are calculated by linear interpolation, and then the adjustment coefficients of all grayscale values ​​are obtained, and then a lookup table is created to ensure that a lookup table that can cover the entire grayscale value is obtained. For example, if the disassembled lamp board does not cover the grayscale value 253, the adjustment coefficient of the grayscale value 253 can be calculated by linear interpolation.

[0122] Specifically, a grayscale value list corresponding to the static image is obtained; if the reference grayscale value does not completely cover the grayscale value list, adjustment coefficients of other grayscale values ​​are calculated by linear interpolation to obtain a lookup table that can cover the grayscale value list.

[0123] Step 124 ′: obtaining the whole-screen correction coefficient according to the static image displayed by the LED display screen and the lookup table.

[0124] In this embodiment, the actual grayscale value of each actual pixel point of the entire screen is determined according to the static image displayed by the LED display screen; the adjustment coefficient corresponding to the actual grayscale value is obtained according to the lookup table, and the whole screen correction coefficient is obtained according to the corresponding adjustment coefficient.

[0125] In actual application scenarios, the LED display screen may have a historical correction coefficient, so it is necessary to take the historical correction coefficient into account to determine whether the LED display screen has a historical correction coefficient; if the LED display screen has a historical correction coefficient, the whole-screen correction coefficient is obtained based on the historical correction coefficient corresponding to each actual pixel point and the corresponding adjustment coefficient; if the LED display screen does not have a historical correction coefficient, the adjustment coefficient corresponding to each actual pixel point is used as the whole-screen correction coefficient.

[0126] In actual application scenarios, the historical correction coefficients include historical brightness correction coefficients and / or historical brightness and chromaticity correction coefficients; the adjustment coefficients include brightness adjustment coefficients and / or brightness and chromaticity adjustment coefficients; the whole screen correction coefficients include whole screen brightness correction coefficients and / or whole screen brightness and chromaticity correction coefficients.

[0127] If it is brightness correction, add the historical brightness correction coefficient corresponding to each actual pixel point and the corresponding brightness adjustment coefficient to obtain the whole screen brightness correction coefficient. And / or,

[0128] If it is brightness and chromaticity correction, the historical brightness and chromaticity correction coefficients corresponding to each actual pixel and the corresponding brightness and chromaticity adjustment coefficients are matrix multiplied to obtain the brightness and chromaticity correction coefficients of the entire screen.

[0129] Here, we only take the brightness correction coefficient (R, G, B) as an example. The method of obtaining the brightness and chromaticity correction (Rr, Rg, Rb, Gr, Gg, Gb, Br, Bg, Bb) is similar to the brightness correction coefficient, so it will not be repeated here. Among them, Rr is the main red correction coefficient, Rg is the coefficient of red compensation to green, Rb is the coefficient of red compensation to blue, Gr is the coefficient of green compensation to red, Gg is the main green correction coefficient, Gb is the coefficient of green compensation to blue, Br is the coefficient of blue compensation to red, Bg is the coefficient of blue compensation to green, and Bb is the main blue correction coefficient. The algorithm of chromaticity correction Rr, Rg, Rb is consistent with that of R in the brightness correction coefficient.

[0130] Correction coefficient addition: If it is a brightness correction coefficient, first adjust the historical brightness correction coefficient and the brightness adjustment coefficient and store them according to brightness and chromaticity. For example, the brightness correction coefficient (R1, G1, B1) is stored as a brightness and chromaticity coefficient as (R1, 0, 0; 0, G1, 0; 0, 0, B1).

[0131] For the historical brightness correction coefficient (R1, G1, B1) and the brightness adjustment coefficient (R2, G2, B2), the result of multiplying the coefficient matrix is ​​(R1*R2, G1*G2, B1*B2).

[0132] If it is a brightness and chromaticity coefficient, it is a distance matrix multiplication. For example, the historical brightness and chromaticity correction coefficients are (Rr1, Rg1, Rb1; Gr1, Gg1, Gb1; Br1, Bg1, Bb1), and the brightness and chromaticity adjustment coefficients (Rr2, Rg2, Rb2; Gr2, Gg2, Gb2; Br2, Bg2, Bb2) are added to obtain: (Rr1*Rr2+Rg1*Gr2+Rb1*Br2,Rr1*Rg2+Rg1*Gg2+Rb1*Bg2,Rr1 *Rb2+Rg1*Gb2+Rb1*Bb2; Gr1*Rr2+Gg1*Gr2+Gb1*Br2,Gr1*Rg2+Gg1*Gg2+Gb1*Bg2,Gr1*Rb2+Gg1*Gb 2+Gb1*Bb2,Br1*Rr2+Bg1*Gr2+Bb1*Br2,Br1*Rg2+Bg1*Gg2+Bb1*Bg2,Br1*Rb2+Bg1*Gb2+Bb1*Bb2).

[0133] In this embodiment, there is no need to perform on-site calibration of the entire screen. Only one or more sample lamp boards need to be calibrated to obtain the previous correction coefficient of each pixel of the lamp board. According to the static image that the LED display needs to display and the corresponding image displayed by the lamp board, the attribute value of the pixel point is used as a link to convert the current correction coefficient into the entire screen correction coefficient, so that the LED display can be calibrated according to the entire screen correction coefficient, which greatly reduces the labor cost and the risk brought by disassembly and assembly.

[0134] Embodiment 3:

[0135] This embodiment specifically defines the type of LED light-emitting chip, and uses the light-emitting chip to illustrate the specific calibration process. Different from Embodiment 2, in this embodiment, the LED light-emitting chip on the LED display screen is a multi-color light-emitting chip. When the LED light-emitting chip on the LED display screen is a multi-color light-emitting chip, one light-emitting chip forms one pixel point, for example, R light, G light, and B light are integrated into one light-emitting chip. In this embodiment, the reference attribute value is the reference equivalent power.

[0136] In Example 2, the R, G, and B lights in the same pixel are spaced apart, that is, when the R, G, and B lights are lit, the heat generation has little influence on each other. When the R, G, and B lights of the LED lamp are integrated into one chip, the temperature of the B light will also rise when the R and G lights are lit. If the correction coefficient of each pixel is only distinguished by the grayscale value, it cannot accurately reflect the correction coefficient of each pixel.

[0137] In this embodiment, see Figure 8 , step 11 specifically includes:

[0138] Step 111: Determine multiple monochrome gamma values ​​of reference pixel points according to the image to be displayed by the light board.

[0139] When the picture displayed on the LED display is a static picture, the picture that the light board needs to display is also fixed. Therefore, the grayscale value (Rs, Gs, Bs) of the reference pixel point can be determined, and then the Gamma value corresponding to the grayscale value can be determined according to the Gamma curve. Each color of light has a corresponding Gamma curve, and the Gamma curve reflects the corresponding relationship between the grayscale value and the Gamma value.

[0140] For example, if Rs=233, the gamma value corresponding to the grayscale value Rs is determined according to the gamma curve of the R lamp; if Gs=200, the gamma value corresponding to the grayscale value Gs is determined according to the gamma curve of the G lamp; if Bs=150, the gamma value corresponding to the grayscale value Bs is determined according to the gamma curve of the B lamp.

[0141] Step 112: Obtain a reference equivalent power of the reference pixel point according to a plurality of monochromatic gamma values ​​and corresponding driving current ratios.

[0142] For example, the current color of a light-emitting chip is (R0, G0, B0), and the benchmark equivalent power calculation formula is: Gamma(R0)*I(R0)+Gamma(G0)*I(G0)+Gamma(B0)*I(B0). Among them, R0, G0, B0 are the corresponding gray values, I(R0), I(G0) and I(B0) are the driving current ratios, and Gamma(R0), Gamma(G0), and Gamma(B0) can be obtained based on the Gamma curve.

[0143] The driving current ratio can be obtained according to the model information of the light-emitting chip.

[0144] In this embodiment, the driving current ratio of the red, green and blue colors is determined according to the model information of the light-emitting chip, wherein the driving current ratio means that under the same driving voltage, the three colors (R, G, B) will have different driving currents, and the driving current is divided by the driving voltage to obtain the driving current ratio of the corresponding lamp.

[0145] For example, for a certain type of light-emitting chip, the driving current ratio of red is 7.01; the driving current ratio of green is 2.39; and the driving current ratio of blue is 1.71.

[0146] It should be noted here that the equivalent power mentioned above is not the actual luminous power. The equivalent power is a proportional value, and some identical parts are ignored. The above formula only describes the general relationship. We only need to determine the equivalent luminous power without paying attention to its actual luminous power.

[0147] See also Fig. 9 , in step 12, the specific process includes the following:

[0148] Step 121": obtaining an equivalent power range corresponding to when the LED display screen displays a static image; dividing the equivalent power range into a plurality of equivalent power intervals according to a preset division method.

[0149] In this embodiment, the actual equivalent power of each pixel is obtained when the LED display screen displays a static image, wherein the method for obtaining the actual equivalent power is the same as the method for obtaining the aforementioned reference equivalent power, which will not be repeated here.

[0150] According to the actual equivalent power of all pixels, the equivalent power range corresponding to the LED display screen displaying a static picture is obtained, and the equivalent power range is [minimum equivalent power, maximum equivalent power].

[0151] For example, the actual equivalent power includes P1, P2, P3, ..., Pn; among them, P1 is the smallest and Pn is the largest, so the equivalent power range is [P1, Pn].

[0152] In an optional manner, the equivalent power range is divided according to a preset power interval to obtain multiple power intervals. For example, when the color (R, G, B) = (0, 0, 0), it is the lowest point of the heating function, and the color (R, G, B) = (255, 255, 255) is counted as the highest point of the heating function. The area between the lowest point and the highest point is divided into several power intervals (such as 100, and the power area is the adjustment accuracy, which can be freely adjusted according to the adjustment result).

[0153] In another optional manner, the equivalent power range is divided according to a preset power interval to obtain multiple power intervals. Different power intervals are set according to the distribution of equivalent power, and the equivalent power range is divided according to the power intervals. Specifically, the power interval corresponding to the sparsely distributed equivalent power is larger, and the power interval corresponding to the densely distributed equivalent power is smaller. Among them, sparse distribution refers to the large difference between several consecutive equivalent powers; dense distribution refers to the small difference between several consecutive equivalent powers.

[0154] Specifically, a quantity threshold N and a power threshold P can be set to sort all equivalent powers in order of the size of the equivalent powers; if the difference between N consecutive equivalent powers is greater than the power threshold P, it means that the distribution is sparse; if the difference between N consecutive equivalent powers is not greater than the power threshold P, it means that the distribution is dense.

[0155] Step 122”: obtain at least one reference pixel point that falls within the same equivalent power interval, and obtain the current correction coefficient of the corresponding reference pixel point; process the current correction coefficient corresponding to the same equivalent power interval to obtain the adjustment coefficient corresponding to the equivalent power interval.

[0156] The equivalent powers of the various reference pixel points on the light board may be equal or unequal. In the present embodiment, the reference pixel points whose equivalent powers fall into the same equivalent power interval are grouped together, and then at least one current correction coefficient corresponding to the equivalent power interval is grouped together, and then at least one current correction coefficient is processed to obtain the adjustment coefficient corresponding to the grayscale value.

[0157] A specific processing method is to obtain the average value, specifically: sum the current correction coefficients corresponding to the same equivalent power interval to obtain the total coefficients; divide the total coefficients by the sum of the number of reference pixel points corresponding to the same equivalent power interval to obtain the adjustment coefficient corresponding to the equivalent power interval.

[0158] Continuing with the above example, put together the correction coefficients R(x1,y1), R(x2,y2)... corresponding to the equivalent power interval [P1,P2]. Take the average value as the adjustment coefficient of the equivalent power interval [P1,P2].

[0159] Another specific processing method can be as follows: for each equivalent power interval, calculate the average value in a weighted manner. Specifically, arrange them according to the magnitude of the correction coefficient, divide multiple intervals based on the magnitude of the correction coefficient, determine the number of correction coefficients in each interval, and the greater the proportion of the number, the greater the weight of the corresponding correction coefficient of the interval, and the smaller the proportion of the number, the smaller the weight of the corresponding correction coefficient of the interval. For example, if the equivalent powers of 10 pixel points fall into the equivalent power interval [P1, P2], and the correction coefficients of these 10 pixel points are arranged from largest to smallest as [S1, S2... S10], where S1, S2, and S3 are in the first interval, S4, S5, S6, S7, and S8 are in the second interval, and S9 and S10 are in the third interval, then the number in the second interval is the largest, the second is the first interval, and the number in the third interval is the smallest. The weights of S1, S2, and S3 can be set as q1; the weights of S4, S5, S6, S7, and S8 are q2; and S9 and S10 are q3, where q3 < q1 < q2 and q3 + q1 + q2 = 1, and then calculate the weighted average value. In this way, the influence of individual special decaying lamps on the whole can be eliminated.

[0160] Step 123: Generate a look-up table according to each equivalent power interval and the corresponding adjustment coefficient.

[0161] Obtain the adjustment coefficients of each equivalent power interval in the foregoing manner, and then generate a look-up table.

[0162] In this embodiment, the gray values of the disassembled lamp board cannot cover the equivalent powers of the entire LED display screen. Therefore, there may be fewer correction coefficients corresponding to some equivalent power intervals, or even no correction coefficients.

[0163] To solve the foregoing problem, we can calculate the adjustment coefficients of other equivalent powers by means of linear interpolation, and then obtain the adjustment coefficients of all equivalent powers, and then create a look-up table to ensure that a look-up table that can cover the entire equivalent power is obtained. For example, if the equivalent power P49 is not covered by the disassembled lamp board, the adjustment coefficient of the equivalent power P49 can be calculated by means of linear interpolation.

[0164] Specifically, obtain the equivalent power list corresponding to the static picture; if the reference equivalent power does not completely cover the equivalent power list, calculate the adjustment coefficients of other equivalent powers by means of linear interpolation to obtain a look-up table that can cover the equivalent power list.

[0165] Step 124: Obtain the overall screen correction coefficient according to the static picture displayed on the LED display screen and the look-up table.

[0166] In this embodiment, the actual equivalent power of each actual pixel point of the entire screen is determined according to the static image displayed by the LED display screen; the adjustment coefficient corresponding to the actual equivalent power is obtained according to the lookup table, and the whole screen correction coefficient is obtained according to the corresponding adjustment coefficient.

[0167] In actual application scenarios, the LED display screen may have a historical correction coefficient, so it is necessary to take the historical correction coefficient into account to determine whether the LED display screen has a historical correction coefficient; if the LED display screen has a historical correction coefficient, the whole-screen correction coefficient is obtained based on the historical correction coefficient corresponding to each actual pixel point and the corresponding adjustment coefficient; if the LED display screen does not have a historical correction coefficient, the adjustment coefficient corresponding to each actual pixel point is used as the whole-screen correction coefficient.

[0168] In actual application scenarios, the historical correction coefficients include historical brightness correction coefficients and / or historical brightness and chromaticity correction coefficients; the adjustment coefficients include brightness adjustment coefficients and / or brightness and chromaticity adjustment coefficients; the whole screen correction coefficients include whole screen brightness correction coefficients and / or whole screen brightness and chromaticity correction coefficients.

[0169] If it is brightness correction, add the historical brightness correction coefficient corresponding to each actual pixel point and the corresponding brightness adjustment coefficient to obtain the whole screen brightness correction coefficient. And / or,

[0170] If it is brightness and chromaticity correction, the historical brightness and chromaticity correction coefficients corresponding to each actual pixel and the corresponding brightness and chromaticity adjustment coefficients are matrix multiplied to obtain the brightness and chromaticity correction coefficients of the entire screen.

[0171] In this embodiment, there is no need to perform on-site calibration of the entire screen. Only one or more sample lamp boards need to be calibrated to obtain the previous correction coefficient of each pixel of the lamp board. According to the static image that the LED display needs to display and the corresponding image displayed by the lamp board, the attribute value of the pixel point is used as a link to convert the current correction coefficient into the entire screen correction coefficient, so that the LED display can be calibrated according to the entire screen correction coefficient, which greatly reduces the labor cost and the risk brought by disassembly and assembly.

[0172] Embodiment 4:

[0173] Based on the above-mentioned embodiments 1-3, this embodiment provides a correction device for an LED display screen, and the correction device is used to implement the correction method described in the above-mentioned embodiments, such as Fig.10 As shown, the correction device includes an image acquisition module, a first correction module, a calculation module and a second correction module.

[0174] The image acquisition module is used to acquire the original image of the light board;

[0175] The first correction module is used to correct the light board according to the original image to obtain the current correction coefficient of each reference pixel point;

[0176] The calculation module is used to determine the reference attribute value of each reference pixel point according to the picture that the light board needs to display;

[0177] The second correction module is used to determine the entire screen correction coefficient of the entire LED display screen according to each reference attribute value and the corresponding current correction coefficient.

[0178] In an optional embodiment, when the LED light-emitting chip on the LED display screen is a monochrome light-emitting chip, the benchmark attribute value is a benchmark grayscale value; the second correction module is specifically used to obtain at least one benchmark pixel point with the same benchmark grayscale value for each benchmark grayscale value, and obtain the current correction coefficient of the corresponding benchmark pixel point; process the current correction coefficient corresponding to the same benchmark grayscale value to obtain the adjustment coefficient corresponding to the benchmark grayscale value; generate a lookup table based on each benchmark grayscale value and the corresponding adjustment coefficient; obtain the whole screen correction coefficient based on the static picture displayed by the LED display screen and the lookup table.

[0179] More specifically, the second correction module is further used to determine the actual grayscale value of each actual pixel of the entire screen based on the static image displayed by the LED display screen; obtain the adjustment coefficient corresponding to the actual grayscale value according to the lookup table, and obtain the entire screen correction coefficient according to the corresponding adjustment coefficient.

[0180] In actual use, the second correction module is also used to determine whether the LED display screen has a historical correction coefficient; if the LED display screen has a historical correction coefficient, the whole-screen correction coefficient is obtained based on the historical correction coefficient corresponding to each actual pixel point and the corresponding adjustment coefficient; if the LED display screen does not have a historical correction coefficient, the adjustment coefficient corresponding to each actual pixel point is used as the whole-screen correction coefficient.

[0181] If it is brightness correction, the historical brightness correction coefficient and the corresponding brightness adjustment coefficient corresponding to each actual pixel are converted according to the storage format of brightness and chromaticity, and the converted correction coefficient and adjustment coefficient are matrix multiplied to obtain the brightness correction coefficient of the entire screen;

[0182] and / or;

[0183] If it is brightness and chromaticity correction, the historical brightness and chromaticity correction coefficients corresponding to each actual pixel and the corresponding brightness and chromaticity adjustment coefficients are matrix multiplied to obtain the brightness and chromaticity correction coefficients of the entire screen.

[0184] In another optional embodiment, when the LED light-emitting chip on the LED display screen is a multi-color light-emitting chip, the benchmark attribute value is a benchmark equivalent power; the calculation module is specifically used to determine multiple monochrome Gamma values ​​of the benchmark pixel point according to the picture that the light board needs to display; based on the multiple monochrome Gamma values ​​and the corresponding driving current ratios, the benchmark equivalent power of the benchmark pixel point is obtained.

[0185] The second correction module is used to obtain the equivalent power range corresponding to the static image displayed by the LED display screen; divide the equivalent power range into multiple equivalent power intervals according to a preset division method; obtain at least one reference pixel point falling into the same equivalent power interval, and obtain the current correction coefficient of the corresponding reference pixel point; process the current correction coefficient corresponding to the same equivalent power interval to obtain the adjustment coefficient corresponding to the equivalent power interval; generate a lookup table according to each equivalent power interval and the corresponding adjustment coefficient; obtain the whole screen correction coefficient according to the static image displayed by the LED display screen and the lookup table.

[0186] Furthermore, the second correction module is used to determine the actual equivalent power of each actual pixel of the entire screen based on the static image displayed by the LED display screen; obtain the adjustment coefficient corresponding to the actual equivalent power according to the lookup table, and obtain the entire screen correction coefficient according to the corresponding adjustment coefficient.

[0187] Among them, the various modules of the correction device of the LED display screen can be integrated into the same device; or, they can also belong to different devices, that is, they are not integrated together. For example, the image acquisition module can be an industrial camera and exist independently; the first correction module, the calculation module and the second correction module are integrated on a certain host computer, and the industrial camera can communicate with the host computer to send the collected data to the host computer. The modules of the host computer process the data in the above-mentioned manner to obtain the correction coefficient of the whole screen. The specific integration status of each module in the correction device of the LED display screen is not specifically limited.

[0188] In this embodiment, there is no need to perform on-site calibration of the entire screen. Only one or more sample lamp boards need to be calibrated to obtain the previous correction coefficient of each pixel of the lamp board. According to the static image that the LED display needs to display and the corresponding image displayed by the lamp board, the attribute value of the pixel point is used as a link to convert the current correction coefficient into the entire screen correction coefficient, so that the LED display can be calibrated according to the entire screen correction coefficient, which greatly reduces the labor cost and the risk brought by disassembly and assembly.

[0189] Embodiment 5:

[0190] Based on the above-mentioned embodiments 1 to 3, Fig.11As shown, this embodiment also provides a correction device, including: at least one processor 21; and a memory 22 communicatively connected to the at least one processor 21; wherein the memory 22 stores instructions executable by the at least one processor 21, and the instructions are executed by the at least one processor 21 so that the at least one processor 21 can execute the correction method described in the aforementioned embodiment.

[0191] The processor 21 and the memory 22 may be connected via a bus or other means. Fig.11 The example of connecting through bus is taken in the following.

[0192] The memory 22 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the correction method in the embodiment of the present application. The processor 21 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 22, that is, implementing the correction method in the above method embodiment.

[0193] The memory 22 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required by at least one function; the data storage area may store data created according to the use of the correction device, etc. In addition, the memory 22 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 22 may optionally include a memory remotely arranged relative to the processor 21, and these remote memories may be connected to the correction device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0194] The one or more modules are stored in the memory 22, and when executed by the one or more processors 21, the correction method in any of the above method embodiments is executed, for example, the correction method steps described above are executed. The correction method is applied to an LED display screen that displays a static image, and at least one light board is removed from the LED display screen in advance. The correction method includes: calibrating the light board to obtain the current correction coefficient of each reference pixel point; determining the reference attribute value of each reference pixel point according to the image that the light board needs to display; and determining the whole screen correction coefficient of the entire LED display screen according to each reference attribute value and the corresponding current correction coefficient.

[0195] In an optional embodiment, when the LED light-emitting chip on the LED display screen is a monochrome light-emitting chip, the benchmark attribute value is a benchmark grayscale value; determining the whole-screen correction coefficient of the entire LED display screen based on each benchmark attribute value and the corresponding current correction coefficient includes: for each benchmark grayscale value, obtaining at least one benchmark pixel point with the same benchmark grayscale value, and obtaining the current correction coefficient of the corresponding benchmark pixel point; processing the current correction coefficient corresponding to the same benchmark grayscale value to obtain the adjustment coefficient corresponding to the benchmark grayscale value; generating a lookup table based on each benchmark grayscale value and the corresponding adjustment coefficient; and obtaining the whole-screen correction coefficient based on the static picture displayed by the LED display screen and the lookup table.

[0196] In another optional embodiment, when the LED light-emitting chip on the LED display screen is a multi-color light-emitting chip, the benchmark attribute value is a benchmark equivalent power; determining the benchmark attribute value of each benchmark pixel point according to the picture that the light board needs to display includes: determining multiple monochrome Gamma values ​​of the benchmark pixel point according to the picture that the light board needs to display; obtaining the benchmark equivalent power of the benchmark pixel point according to the multiple monochrome Gamma values ​​and the corresponding driving current ratio.

[0197] Furthermore, the method of determining the whole-screen correction coefficient of the entire LED display screen based on each benchmark attribute value and the corresponding current correction coefficient includes: obtaining the equivalent power range corresponding to the static picture displayed by the LED display screen; dividing the equivalent power range into multiple equivalent power intervals according to a preset division method; obtaining at least one benchmark pixel point falling into the same equivalent power interval, and obtaining the current correction coefficient of the corresponding benchmark pixel point; processing the current correction coefficient corresponding to the same equivalent power interval to obtain the adjustment coefficient corresponding to the equivalent power interval; generating a lookup table according to each equivalent power interval and the corresponding adjustment coefficient; obtaining the whole-screen correction coefficient according to the static picture displayed by the LED display screen and the lookup table.

[0198] The above-mentioned product can execute the method provided in the embodiment of the present application, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the method provided in the embodiment of the present application.

[0199] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0200] Through the description of the above implementation methods, ordinary technicians in this field can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, it can also be implemented by hardware. Ordinary technicians in this field can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0201] 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 them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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 correction method is applied to an LED display screen that displays static images, and at least one light board is removed from the LED display screen in advance. The correction method includes: Calibrate the light board to obtain the current calibration coefficient of each reference pixel point; Determine the reference attribute value of each reference pixel point according to the picture to be displayed by the light board; According to each reference property value and the corresponding current correction coefficient, the whole screen correction coefficient of the entire LED display is determined.

2. The calibration method according to claim 1, characterized in that: When the LED light-emitting chip on the LED display screen is a monochrome light-emitting chip, the reference attribute value is a reference grayscale value; Determining the entire screen correction coefficient of the entire LED display screen according to each reference attribute value and the corresponding current correction coefficient includes: For each reference grayscale value, obtaining at least one reference pixel having the same reference grayscale value, and obtaining a current correction coefficient of the corresponding reference pixel; Processing the current correction coefficient corresponding to the same reference grayscale value to obtain the adjustment coefficient corresponding to the reference grayscale value; Generate a lookup table according to each reference grayscale value and the corresponding adjustment coefficient; The whole-screen correction coefficient is obtained according to the static picture displayed by the LED display screen and the lookup table.

3. The calibration method according to claim 2, characterized in that: The step of obtaining the whole screen correction coefficient according to the static picture displayed by the LED display screen and the lookup table includes: Determine the actual grayscale value of each actual pixel point of the entire screen according to the static picture displayed by the LED display screen; The adjustment coefficient corresponding to the actual grayscale value is obtained according to the lookup table, and the whole screen correction coefficient is obtained according to the corresponding adjustment coefficient.

4. The calibration method according to claim 3, characterized in that: The obtaining of the whole screen correction coefficient according to the corresponding adjustment coefficient comprises: Determining whether the LED display screen has a historical correction coefficient; If the LED display screen has a historical correction coefficient, the whole screen correction coefficient is obtained according to the historical correction coefficient corresponding to each actual pixel point and the corresponding adjustment coefficient; If the LED display screen does not have a historical correction coefficient, the adjustment coefficient corresponding to each actual pixel point is used as the whole-screen correction coefficient.

5. The calibration method according to claim 4, characterized in that: The historical correction coefficients include historical brightness correction coefficients and / or historical brightness and chromaticity correction coefficients; the adjustment coefficients include brightness adjustment coefficients and / or brightness and chromaticity adjustment coefficients; the whole screen correction coefficients include whole screen brightness correction coefficients and / or whole screen brightness and chromaticity correction coefficients; The whole screen correction coefficient is obtained according to the historical correction coefficient corresponding to each actual pixel point and the corresponding adjustment coefficient, including: If it is brightness correction, the historical brightness correction coefficient and the corresponding brightness adjustment coefficient corresponding to each actual pixel are converted according to the storage format of brightness and chromaticity, and the converted correction coefficient and adjustment coefficient are matrix multiplied to obtain the brightness correction coefficient of the entire screen; and / or; If it is brightness and chromaticity correction, the historical brightness and chromaticity correction coefficients corresponding to each actual pixel and the corresponding brightness and chromaticity adjustment coefficients are matrix multiplied to obtain the brightness and chromaticity correction coefficients of the entire screen.

6. The calibration method according to claim 2, characterized in that: The processing of the current correction coefficient corresponding to the same reference gray value to obtain the adjustment coefficient corresponding to the reference gray value includes: Perform a sum operation on the current correction coefficients corresponding to the same reference gray value to obtain the total coefficient; The sum of the coefficients is divided by the sum of the number of reference pixels corresponding to the same reference gray value to obtain the adjustment coefficient corresponding to the reference gray value; or, The average value is calculated in a weighted manner, specifically: the correction coefficients are arranged according to their sizes, and the number of correction coefficients in each interval is determined. The larger the proportion of the correction coefficient, the greater the weight of the correction coefficient corresponding to the interval, and the smaller the proportion of the correction coefficient, the smaller the weight of the correction coefficient corresponding to the interval.

7. The calibration method according to claim 2, characterized in that: The generating of the lookup table according to each reference grayscale value and the corresponding adjustment coefficient comprises: Obtaining a grayscale value list corresponding to the static picture; If the reference grayscale value does not completely cover the grayscale value list, the adjustment coefficients of other grayscale values ​​are calculated by linear interpolation to obtain a lookup table that can cover the grayscale value list.

8. The calibration method according to claim 1, characterized in that: When the LED light-emitting chip on the LED display screen is a multi-color light-emitting chip, the reference attribute value is the reference equivalent power; Determining the reference attribute value of each reference pixel point according to the picture to be displayed by the light board includes: Determine multiple monochrome gamma values ​​of reference pixel points according to the picture to be displayed by the light board; According to the multiple monochromatic gamma values ​​and the corresponding driving current ratios, the reference equivalent power of the reference pixel is obtained.

9. The calibration method according to claim 8, characterized in that: Determining the entire screen correction coefficient of the entire LED display screen according to each reference attribute value and the corresponding current correction coefficient includes: Obtaining an equivalent power range corresponding to when the LED display screen displays a static image; dividing the equivalent power range into a plurality of equivalent power intervals according to a preset division method; Obtain at least one reference pixel point that falls within the same equivalent power interval, and obtain a current correction coefficient of the corresponding reference pixel point; process the current correction coefficient corresponding to the same equivalent power interval to obtain an adjustment coefficient corresponding to the equivalent power interval; Generate a lookup table according to each equivalent power interval and the corresponding adjustment coefficient; The whole-screen correction coefficient is obtained according to the static picture displayed by the LED display screen and the lookup table.

10. The calibration method according to claim 9, characterized in that: The step of obtaining the whole screen correction coefficient according to the static picture displayed by the LED display screen and the lookup table includes: Determine the actual equivalent power of each actual pixel point of the entire screen according to the static picture displayed by the LED display screen; The adjustment coefficient corresponding to the actual equivalent power is obtained according to the lookup table, and the whole-screen correction coefficient is obtained according to the corresponding adjustment coefficient.

11. A calibration device for an LED display screen, characterized in that: The correction device is used to implement the correction method according to any one of claims 1 to 10, and the correction device includes an image acquisition module, a first correction module, a calculation module and a second correction module; The image acquisition module is used to acquire the original image of the light board; The first correction module is used to correct the light board according to the original image to obtain the current correction coefficient of each reference pixel point; The calculation module is used to determine the reference attribute value of each reference pixel point according to the picture that the light board needs to display; The second correction module is used to determine the entire screen correction coefficient of the entire LED display screen according to each reference attribute value and the corresponding current correction coefficient.

12. A calibration device for an LED display screen, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the correction method according to any one of claims 1 to 10.

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