Temperature compensation method, device and system for LED display screen point-by-point chromaticity correction

Abstract

The invention belongs to the technical field of LED display, and particularly relates to a temperature compensation method, device and system for LED display screen point-by-point chromaticity correction. The invention discloses a temperature compensation method for LED display screen point-by-point chromaticity correction. The method comprises the following steps: selecting an effective temperature interval of temperature compensation; point-by-point chromaticity correction is carried out on different temperature points in the effective temperature interval to obtain point-by-point chromaticity correction data; obtaining the temperature value of each box body or module when the LED display screen works normally; and calculating pixels in the LED display screen according to the temperature value and the point-by-point chromaticity correction data to obtain a chromaticity correction coefficient. According to the invention, temperature compensation is added in correction, the chromaticity correction effect of each pixel point in the LED display screen when the working temperature changes is improved, and the display effect of the LED display screen is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of LED display, and in particular relates to a temperature compensation method, device and system for point-by-point chromaticity correction of an LED display screen. Background Art

[0002] In LED display screens, in order to compensate for the differences in optical colorimetric parameters of the LED lamp beads corresponding to each pixel, the LED lamp beads of the entire screen will be chromatically corrected point by point.

[0003] Since the luminous efficiency of LED lamp beads cannot reach 100%, LED lamp beads will inevitably generate heat when emitting light. In addition, the heat generated by the LED constant current driver chip and power module in the LED box will cause the temperature of the LED box to change greatly during normal operation, and the optical color parameters of LED lamp beads will change at different temperatures. Therefore, the point-by-point color calibration of the general LED full screen will be selected for measurement at a typical operating temperature.

[0004] Since the point-by-point chromaticity correction of the LED full screen is measured at a typical operating temperature, the point-by-point correction effect of the LED display is not good at other operating temperatures, which makes the LED display display poor at other operating temperatures. Summary of the invention

[0005] The object of the present invention is to provide a temperature compensation method, device and system for point-by-point chromaticity correction of an LED display screen, so as to solve the problem that the point-by-point correction effect of an LED display screen is poor at different temperatures.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a temperature compensation method for point-by-point chromaticity correction of an LED display screen, comprising:

[0008] Select the effective temperature range for temperature compensation;

[0009] Performing point-by-point chromaticity correction at different temperature points within the effective temperature range to obtain point-by-point chromaticity correction data;

[0010] Get the temperature value of each cabinet or module when the LED display screen is working normally;

[0011] The pixels in the LED display screen are calculated according to the temperature value and the point-by-point chromaticity correction data to obtain a chromaticity correction coefficient.

[0012] In some embodiments, the point-by-point chromaticity correction at different temperature points within the effective temperature range is performed at least twice.

[0013] In some embodiments, the two point-by-point chromaticity calibrations at different temperature points are performed with the same target chromaticity value.

[0014] In some embodiments, the reading of the temperature value of each box or module when the LED display screen is operating normally includes:

[0015] Read the temperature value of each box or module;

[0016] Perform smooth transition processing on the pixels at the time nodes according to the video frame sequence;

[0017] The pixel temperature value corresponding to each pixel is obtained through spatial interpolation.

[0018] In some embodiments, the chromaticity correction coefficient is obtained by performing interpolation calculation using the pixel temperature value to obtain the chromaticity correction coefficient after temperature compensation, and performing point-by-point chromaticity correction.

[0019] In a second aspect, the present invention further provides a temperature compensation device for point-by-point chromaticity correction, the device comprising:

[0020] A data acquisition module is used to obtain the temperature value of each box or module;

[0021] A point-by-point correction module, used to calculate point-by-point chromaticity correction data at different temperature points;

[0022] A compensation coefficient calculation module, used to calculate the chromaticity correction coefficient;

[0023] The correction module is used to output the correction coefficient and calibrate the LED display screen.

[0024] In some embodiments, the compensation coefficient calculation module further includes:

[0025] A smoothing processing unit, used to perform smooth transition processing on pixels at time nodes according to a video frame sequence;

[0026] The difference processing unit is used to perform spatial interpolation processing on the pixel points to calculate the corresponding pixel temperature value.

[0027] In a third aspect, the present invention further provides a temperature compensation system for point-by-point chromaticity correction, the system comprising: the temperature compensation method for point-by-point chromaticity correction of an LED display screen described in the first aspect.

[0028] In a fourth aspect, the present invention further provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the temperature compensation method for point-by-point chromaticity correction of an LED display screen as described in the first aspect.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: Different from the prior art, the present invention collects two sets of point-by-point correction data at the lowest and highest temperatures in the normal working temperature range, then interpolates and calculates the temperature value of each pixel lamp bead, and then interpolates and calculates the point-by-point correction data of each pixel lamp bead. The chromaticity correction effect of each pixel point in the LED display screen when the temperature changes during operation is improved, and the display effect of the LED display screen is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of a temperature compensation method for point-by-point chromaticity correction of an LED display screen according to an embodiment of the present invention;

[0031] Figure 2 A specific flow chart of obtaining the temperature value of each box or module in a temperature compensation method for point-by-point chromaticity correction of an LED display screen according to another embodiment of the present invention;

[0032] Figure 3 It is a schematic structural diagram of a temperature compensation device for point-by-point chromaticity correction according to an embodiment of the present invention;

[0033] Figure 4 The figure is a schematic diagram of the structure of a compensation coefficient calculation module in a temperature compensation device for point-by-point chromaticity correction according to another embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to be able to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0035] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 The flowchart of the temperature compensation method of the point-by-point chromaticity correction of the LED display screen according to one embodiment of the present invention is as follows. The temperature compensation method of the point-by-point chromaticity correction of the LED display screen comprises:

[0036] Step S110, selecting an effective temperature range for temperature compensation;

[0037] Step S120, performing point-by-point chromaticity correction at different temperature points within the effective temperature range to obtain point-by-point chromaticity correction data;

[0038] Step S130, obtaining the temperature value of each box or module when the LED display screen is working normally;

[0039] Step S140, calculating the pixels in the LED display screen according to the temperature value and the point-by-point chromaticity correction data to obtain a chromaticity correction coefficient.

[0040] The point-by-point chromaticity correction at different temperature points within the effective temperature range is performed at least twice.

[0041] Specifically, the two point-by-point chromaticity corrections at different temperature points are corrected with the same target chromaticity value. The temperature value of each box or module when the LED display screen is working normally includes:

[0042] Step S131, reading the temperature value of each box or module;

[0043] Step S132, performing smooth transition processing on the pixel points at the time nodes according to the video frame sequence;

[0044] Step S133, obtaining the pixel temperature value corresponding to each pixel through spatial interpolation.

[0045] In the whole calculation process, the chromaticity correction coefficient is obtained by interpolating the pixel temperature value to obtain the temperature-compensated chromaticity correction coefficient, and then performing point-by-point chromaticity correction.

[0046] See also Figure 3 and Figure 4 , Figure 3 is a schematic structural diagram of a temperature compensation device for point-by-point chromaticity correction according to an embodiment of the present invention, Figure 4 The figure is a schematic diagram of the structure of a compensation coefficient calculation module in a temperature compensation device for point-by-point chromaticity correction according to another embodiment of the present invention.

[0047] The data acquisition module 210 is used to obtain the temperature value of each box or module; the point-by-point correction module 220 is used to calculate the point-by-point chromaticity correction data at different temperature points; the compensation coefficient calculation module 230 is used to calculate the chromaticity correction coefficient; the correction module 240 is used to output the correction coefficient and correct the LED display. Specifically, the compensation coefficient calculation module 230 also includes: a smoothing processing unit 231, which is used to perform smooth transition processing on the pixel points at the time node according to the video frame sequence; and a difference processing unit 232, which is used to perform spatial interpolation processing on the pixel points to calculate the corresponding pixel temperature value.

[0048] The following is a specific embodiment: In the working LED display screen, the temperature T0 and T1 are selected, and T0-T1 is used as the effective temperature range for temperature compensation calculation. For each LED display screen cabinet, the reading of the temperature sensor on the cabinet is taken as the standard, and the cabinet is turned on / off as a temperature control method. At temperatures T0 and T1, respectively, with the same target chromaticity value, two point-by-point chromaticity corrections are performed to obtain two sets of point-by-point chromaticity correction data C0 and C1. When the LED display screen is working normally, the LED display screen controller regularly reads the temperature value of the temperature sensor on each cabinet or module. First, a smooth transition process is performed on the time node according to the video frame sequence. Then, the temperature value corresponding to each pixel is obtained by spatial interpolation. Finally, the LED display screen controller uses the pixel temperature values ​​C0 and C1 to perform interpolation calculations on each pixel in each frame of video, obtains the chromaticity correction coefficient after temperature compensation, and completes the point-by-point chromaticity correction.

[0049] At the lowest and highest temperatures in the normal operating temperature range, two sets of point-by-point correction data are collected. A temperature sensor is configured on each box or each module. When the display screen is working normally, the LED display screen control system interpolates and calculates the temperature value of each pixel lamp bead according to the value of each temperature sensor. Then interpolate and calculate the point-by-point correction data of each pixel lamp bead. In the above embodiment, more than two point-by-point chromaticity corrections can be performed, that is, n sets of point-by-point chromaticity correction data C0, C1, C2...Cn are obtained at n temperatures T0, T1, T2...Tn respectively.

[0050] Through the temperature compensation method for point-by-point chromaticity correction of an LED display screen applied by the present invention, point-by-point correction data at the working temperature of multiple LED display screens are selected, and the chromaticity correction coefficient is obtained based on the point-by-point correction data and the temperature interpolation compensation calculation, and finally the correction is completed, so that each pixel point of the LED display screen can perform accurate chromaticity correction in the changing working temperature, thereby ensuring the display effect of the LED display screen and avoiding the problem that the traditional LED display screen corresponds to a specific typical temperature, and therefore the display screen has poor point-by-point correction effect at other working temperatures.

[0051] The embodiment of the present invention also provides a temperature compensation system for point-by-point chromaticity correction of an LED display screen, and the temperature compensation system for point-by-point chromaticity correction of an LED display screen comprises: the temperature compensation method for point-by-point chromaticity correction of an LED display screen described in any embodiment of the present invention.

[0052] An embodiment of the present invention application also provides an electronic device, including a processor and a machine-readable storage medium, wherein the machine-readable storage medium stores machine-executable instructions that can be executed by the processor. When called and executed by the processor, the processor-executable instructions prompt the processor to: implement the temperature compensation method for point-by-point chromaticity correction of an LED display screen as described in any embodiment of the present invention application.

[0053] An embodiment of the present invention further provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the temperature compensation method for point-by-point chromaticity correction of an LED display screen as described in any of the above embodiments.

[0054] If the components / modules / units integrated in the system / computer device are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned implementation method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method implementations when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0055] Matters not covered by the present invention are known technologies.

[0056] In the several specific embodiments provided by the present invention, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system implementation described above is only illustrative, for example, the division of the components is only a logical function division, and there may be other division methods in actual implementation.

[0057] In addition, each functional module / component in each embodiment of the present invention may be integrated into the same processing module / component, or each module / component may exist physically separately, or two or more modules / components may be integrated into the same module / component. The above-mentioned integrated modules / components may be implemented in the form of hardware or in the form of hardware plus software functional modules / components.

[0058] It is obvious to those skilled in the art that the embodiments of the present invention are not limited to the details of the above exemplary embodiments, and that the embodiments of the present invention can be implemented in other specific forms without departing from the spirit or basic features of the embodiments of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the embodiments of the present invention is limited by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the embodiments of the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units, modules or devices stated in the system, device or terminal claims can also be implemented by the same unit, module or device through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

[0059] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A temperature compensation method for point-by-point chromaticity correction of an LED display screen, characterized in that: include: Select the effective temperature range for temperature compensation; Performing point-by-point chromaticity correction at different temperature points within the effective temperature range to obtain point-by-point chromaticity correction data; Get the temperature value of each cabinet or module when the LED display screen is working normally; The pixels in the LED display screen are calculated according to the temperature value and the point-by-point chromaticity correction data to obtain a chromaticity correction coefficient.

2. The temperature compensation method for point-by-point chromaticity correction of an LED display screen according to claim 1, characterized in that: The point-by-point chromaticity correction at different temperature points within the effective temperature range is performed at least twice.

3. The temperature compensation method for point-by-point chromaticity correction of an LED display screen according to claim 2, characterized in that: The two point-by-point chromaticity corrections at different temperature points are performed with the same target chromaticity value.

4. The temperature compensation method for point-by-point chromaticity correction of an LED display screen according to claim 3, characterized in that: The method of obtaining the temperature value of each box or module when the LED display screen is working normally includes: Read the temperature value of each box or module; Perform smooth transition processing on the pixels at the time nodes according to the video frame sequence; The pixel temperature value corresponding to each pixel is obtained through spatial interpolation.

5. The temperature compensation method for point-by-point chromaticity correction of an LED display screen according to claim 4, characterized in that: The chromaticity correction coefficient is obtained by performing interpolation calculation using the pixel temperature value to obtain the chromaticity correction coefficient after temperature compensation, and performing point-by-point chromaticity correction.

6. A temperature compensation device for point-by-point chromaticity correction, characterized in that: The device comprises: A data acquisition module is used to obtain the temperature value of each box or module; A point-by-point correction module, used to calculate point-by-point chromaticity correction data at different temperature points; A compensation coefficient calculation module, used to calculate the chromaticity correction coefficient; The correction module is used to output the correction coefficient and calibrate the LED display screen.

7. The temperature compensation device for point-by-point chromaticity correction according to claim 6, characterized in that: The compensation coefficient calculation module further includes: A smoothing processing unit, used to perform smooth transition processing on pixels at time nodes according to a video frame sequence; The difference processing unit is used to perform spatial interpolation processing on the pixel points to calculate the corresponding pixel temperature value.

8. A temperature compensation system for point-by-point chromaticity correction, characterized in that: The system comprises: the temperature compensation method for point-by-point chromaticity correction of an LED display screen according to claims 1-5.

9. A storage medium, characterized in that: A computer program is stored thereon, wherein the computer program, when executed by a processor, implements the temperature compensation method for point-by-point chromaticity correction of an LED display screen of claims 1-5.

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