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

Abstract

The present invention belongs to the technical field of LED display, and specifically relates to a temperature compensation method for LED display screen point-by-point chromaticity correction, an apparatus and a system. The temperature compensation method for LED display screen point-by-point chromaticity correction comprises: selecting an effective temperature range for temperature compensation; in the effective temperature range, performing point-by-point chromaticity correction at different temperature points to obtain point-by-point chromaticity correction data; acquiring a temperature value of each box body or module during the normal working of an LED display screen; and, according to the temperature value and the point-by-point chromaticity correction data, calculating pixels of the LED display screen to obtain a chromaticity correction coefficient. By providing temperature compensation for correction, the present invention improves the chromaticity correction effect of each pixel point in the LED display screen when the working temperature changes, improving the display effect of the LED display screen.

Description

TECHNICAL FIELD

[0001] The present invention belongs to the technical field of LED display technologies, and specifically relates to a temperature compensation method for point-by-point chromaticity correction of an LED display screen, apparatus, and system.BACKGROUND ART

[0002] In LED display screens, in order to compensate for differences in optical chromaticity parameters of LED lamp beads corresponding to each pixel, point-by-point chromaticity correction is performed on the LED lamp beads of the entire screen.

[0003] Since the luminous efficiency of an LED lamp bead cannot reach 100%, the LED lamp bead will inevitably generate heat during light emission. Coupled with the heat generated by the LED constant current driving chips and power modules within the LED cabinet, the temperature of the LED cabinet undergoes significant changes during normal operation. Furthermore, the optical chromaticity parameters of the LED lamp beads vary at different temperatures. Therefore, point-by-point chromaticity correction for a full LED screen is typically performed by measuring at a specific typical operating temperature.

[0004] Since the point-by-point chromaticity correction for the full LED screen is performed by measuring at a certain typical operating temperature, the effect of point-by-point correction for the LED display screen is not satisfactory at other operating temperatures, thereby resulting in poor display quality of the LED display screen at other operating temperatures.SUMMARY

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

[0006] To achieve the above objective, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a temperature compensation method for point-by-point chromaticity correction of an LED display screen, comprising: selecting a valid temperature interval for temperature compensation; performing point-by-point chromaticity correction at different temperature points within the valid temperature interval to obtain point-by-point chromaticity correction data; acquiring temperature values on each cabinet or module of the LED display screen during normal operation; calculating a chromaticity correction coefficient for a pixel in the LED display screen according to the temperature value and the point-by-point chromaticity correction data.

[0007] In some embodiments, in the step of performing point-by-point chromaticity correction at different temperature points within the valid temperature interval, point-by-point chromaticity correction is performed at least at two different temperature points.

[0008] In some embodiments, in the point-by-point chromaticity correction at the two different temperature points, correction is performed using the same target chromaticity value.

[0009] In some embodiments, the acquiring temperature values on each cabinet or module of the LED display screen during normal operation comprises: reading the temperature value on each cabinet or module; performing smoothing processing on pixel points at time nodes according to a video frame sequence; obtaining a pixel temperature value corresponding to each pixel through spatial interpolation.

[0010] In some embodiments, the obtaining a chromaticity correction coefficient is performed by using interpolation calculation based on the pixel temperature value to obtain a chromaticity correction coefficient after temperature compensation; then point-by-point chromaticity correction is performed.

[0011] In a second aspect, the present invention further provides a temperature compensation apparatus for point-by-point chromaticity correction, wherein the apparatus comprises: a data acquisition module, configured to acquire temperature values on each cabinet or module; a point-by-point correction module, configured to calculate point-by-point chromaticity correction data at different temperature points; a compensation coefficient calculation module, configured to calculate a chromaticity correction coefficient; and a correction module, configured to output a correction coefficient and correct the LED display screen.

[0012] In some embodiments, the compensation coefficient calculation module further comprises: a smoothing processing unit, configured to perform smoothing processing on pixel points at time nodes according to a video frame sequence; and an interpolation processing unit, configured to perform spatial interpolation processing on pixel points to calculate corresponding pixel temperature values.

[0013] In a third aspect, the present invention further provides a temperature compensation system for point-by-point chromaticity correction, wherein the system comprises the temperature compensation method for point-by-point chromaticity correction of an LED display screen according to the first aspect.

[0014] 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 according to the first aspect.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: distinct from the prior art, the present invention acquires two sets of point-by-point correction data at the lowest and highest temperatures within a normal operating temperature interval, then calculates the temperature value of each pixel lamp bead by interpolation, and further calculates the point-by-point correction data of each pixel lamp bead by interpolation. This improves the chromaticity correction effect of each pixel point in the LED display screen when the temperature changes during operation, and enhances the display quality of the LED display screen.BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 is a flowchart of a temperature compensation method for point-by-point chromaticity correction of an LED display screen according to an embodiment of the present invention; FIG. 2 is a specific flowchart of acquiring temperature values of each cabinet or module in the temperature compensation method for point-by-point chromaticity correction of an LED display screen according to another embodiment of the present invention; FIG. 3 is a structural schematic diagram of a temperature compensation apparatus for point-by-point chromaticity correction according to an embodiment of the present invention; FIG. 4 is a structural schematic diagram of a compensation coefficient calculation module in the temperature compensation apparatus for point-by-point chromaticity correction according to another embodiment of the present invention. DETAILED DESCRIPTION OF EMBODIMENTS

[0017] In order to more clearly understand the above objectives, features, and advantages of the present invention, the present invention will be described in detail below in combination with the drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present invention 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 meanings as commonly understood by those skilled in the art to which the present invention belongs. 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.

[0018] Referring to FIG. 1 and FIG. 2, FIG. 1 and FIG. 2 are flowcharts of a temperature compensation method for point-by-point chromaticity correction of an LED display screen according to an embodiment of the present invention. A temperature compensation method for point-by-point chromaticity correction of an LED display screen comprises: Step S110: selecting a valid temperature interval for temperature compensation; Step S120: performing point-by-point chromaticity correction at different temperature points within the valid temperature interval to obtain point-by-point chromaticity correction data; Step S130: acquiring temperature values on each cabinet or module of the LED display screen during normal operation; Step S140: calculating a chromaticity correction coefficient for a pixel in the LED display screen according to the temperature value and the point-by-point chromaticity correction data.

[0019] In the step of performing point-by-point chromaticity correction at different temperature points within the valid temperature interval, point-by-point chromaticity correction is performed at least at two different temperature points.

[0020] Specifically, in the point-by-point chromaticity correction at the two different temperature points, correction is performed using the same target chromaticity value. The acquiring temperature values on each cabinet or module of the LED display screen during normal operation comprises: Step S131: reading the temperature value on each cabinet or module; Step S132: performing smoothing processing on pixel points at time nodes according to a video frame sequence; Step S133: obtaining a pixel temperature value corresponding to each pixel through spatial interpolation.

[0021] Throughout the calculation process, the step of obtaining a chromaticity correction coefficient is performed by using interpolation calculation based on the pixel temperature value to obtain a chromaticity correction coefficient after temperature compensation; then point-by-point chromaticity correction is performed.

[0022] Referring to FIG. 3 and FIG. 4, FIG. 3 is a structural schematic diagram of a temperature compensation apparatus for point-by-point chromaticity correction according to an embodiment of the present invention, and FIG. 4 is a structural schematic diagram of a compensation coefficient calculation module in the temperature compensation apparatus for point-by-point chromaticity correction according to another embodiment of the present invention.

[0023] A data acquisition module 210 is configured to acquire temperature values on each cabinet or module; a point-by-point correction module 220 is configured to calculate point-by-point chromaticity correction data at different temperature points; a compensation coefficient calculation module 230 is configured to calculate a chromaticity correction coefficient; a correction module 240 is configured to output a correction coefficient and correct the LED display screen. Specifically, the compensation coefficient calculation module 230 further comprises: a smoothing processing unit 231, configured to perform smoothing processing on pixel points at time nodes according to a video frame sequence; and an interpolation processing unit 232, configured to perform spatial interpolation processing on pixel points to calculate corresponding pixel temperature values.

[0024] A specific embodiment is as follows. Temperatures T0 and T1 are selected from a working LED display screen, and T0-T1 serves as the valid temperature interval for temperature compensation calculation. For each LED display screen cabinet, taking the reading of the temperature sensor on the cabinet as the standard, and using turning on / off the cabinet as a temperature control means, two point-by-point chromaticity corrections are performed at temperatures T0 and T1 respectively with the same target chromaticity value, to acquire two sets of point-by-point chromaticity correction data CO and C1. When the LED display screen is operating normally, the LED display screen controller periodically reads the temperature values of the temperature sensors on each cabinet or module. First, smoothing processing is performed at time nodes according to the video frame sequence. Then, through spatial interpolation, the temperature value corresponding to each pixel is obtained. Finally, the LED display screen controller performs interpolation calculation for each pixel in each frame of video using the pixel temperature values, C0, and C1, to obtain the chromaticity correction coefficient after temperature compensation, thereby completing the point-by-point chromaticity correction.

[0025] Two sets of point-by-point correction data are acquired at the lowest and highest temperatures of the normal operating temperature interval. One temperature sensor is configured on each cabinet or each module. When the display screen is operating normally, the LED display screen control system calculates the temperature value of each pixel lamp bead by interpolation according to the value of each temperature sensor. Then, the point-by-point correction data of each pixel lamp bead is calculated by performing interpolation calculation. In the above embodiment, point-by-point chromaticity correction can also be performed more than twice, that is, n sets of point-by-point chromaticity correction data C0, C1, C2... Cn are acquired at n temperatures T0, T1, T2... Tn respectively.

[0026] Through the temperature compensation method for point-by-point chromaticity correction of an LED display screen of the present invention, point-by-point correction data under multiple operating temperatures of the LED display screen is selected, and the chromaticity correction coefficient is obtained through calculation based on the point-by-point correction data and temperature interpolation compensation, thus completing the correction. This enables each pixel point of the LED display screen to undergo precise chromaticity correction during changing operating temperatures, ensures the display quality of the LED display screen, and avoids the problem in conventional LED display screens where point-by-point correction is configured for a specific typical temperature, resulting in poor point-by-point correction performance at other operating temperatures.

[0027] The embodiments of the present invention further provide a temperature compensation system for point-by-point chromaticity correction of an LED display screen, wherein 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 according to any embodiments of the present invention.

[0028] The embodiments of the present invention further provide an electronic device, comprising a processor and a machine-readable storage medium, wherein the machine-readable storage medium stores machine-executable instructions capable of being executed by the processor; and when called and executed by the processor, the machine-executable instructions cause the processor to implement the temperature compensation method for point-by-point chromaticity correction of an LED display screen according to any embodiment of the present invention.

[0029] 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 according to any of the above embodiments.

[0030] 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 may be stored in a computer-readable storage medium. Based on such understanding, the present invention can implement all or part of the processes in the methods of the above embodiments, which can also be completed by instructing relevant hardware via a computer program. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, the computer program can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or certain intermediate forms. The computer-readable storage medium can include: any entity or apparatus capable of carrying the computer program code, a recording medium, a USB flash drive, a removable hard disk, a magnetic disk, an optical disc, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. It should be noted that the content included 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, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0031] Matters not described in detail in the present invention are known to those skilled in the art.

[0032] In 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 embodiments described above are merely schematic. For example, the division of the components is only a division of logical functions, and there can be other division methods during actual implementation.

[0033] In addition, each functional module / component in various embodiments of the present invention can be integrated in the same processing module / component, or each module / component can physically exist separately, or two or more modules / components can be integrated in the same module / component. The integrated module / component described above can be implemented in the form of hardware, or in the form of hardware plus software functional modules / components.

[0034] For those skilled in the art, it is apparent 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 characteristics of the embodiments of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view. The scope of the embodiments of the present invention is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be covered within the embodiments of the present invention. Any reference signs in the claims shall not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprise" does not exclude other units or steps, and the singular does not exclude the plural. A plurality of units, modules, or devices stated in the system, apparatus, or terminal claims may also be implemented by the same unit, module, or device through software or hardware. Words such as "first" and "second" are used to denote names and do not indicate any specific order.

[0035] The above embodiments only express several embodiments of the present invention, and the description thereof is relatively specific and detailed, but should not be understood as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, several deformations and improvements can be made without departing from the concept of the present invention, which 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 appended claims.

Claims

1. A temperature compensation method for point-by-point chromaticity correction of an LED display screen, <b>characterized by comprising: selecting a valid temperature interval for temperature compensation; performing point-by-point chromaticity correction at different temperature points within the valid temperature interval to obtain point-by-point chromaticity correction data; acquiring temperature values on each cabinet or module of the LED display screen during normal operation; and calculating a chromaticity correction coefficient for a pixel in the LED display screen according to the temperature value and the point-by-point chromaticity correction data.

2. The temperature compensation method for point-by-point chromaticity correction of an LED display screen according to claim 1, wherein in the performing point-by-point chromaticity correction at different temperature points within the valid temperature interval, point-by-point chromaticity correction is performed at least at two different temperature points.

3. The temperature compensation method for point-by-point chromaticity correction of an LED display screen according to claim 2, wherein in the point-by-point chromaticity correction at the two different temperature points, correction is performed using 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, wherein the acquiring temperature values on each cabinet or module of the LED display screen during normal operation comprises: reading the temperature value on each cabinet or module; performing smoothing processing on pixel points at time nodes according to a video frame sequence; and obtaining a pixel temperature value corresponding to each pixel through spatial interpolation.

5. The temperature compensation method for point-by-point chromaticity correction of an LED display screen according to claim 4, wherein the obtaining a chromaticity correction coefficient is performed by using interpolation calculation based on the pixel temperature value to obtain a chromaticity correction coefficient after temperature compensation, and the point-by-point chromaticity correction is performed.

6. A temperature compensation apparatus for point-by-point chromaticity correction, wherein the apparatus comprises: a data acquisition module, configured to acquire temperature values on each cabinet or module; a point-by-point correction module, configured to calculate point-by-point chromaticity correction data at different temperature points; a compensation coefficient calculation module, configured to calculate a chromaticity correction coefficient; and a correction module, configured to output a correction coefficient and correct the LED display screen.

7. The temperature compensation apparatus for point-by-point chromaticity correction according to claim 6, wherein the compensation coefficient calculation module further comprises: a smoothing processing unit, configured to perform smoothing processing on pixel points at time nodes according to a video frame sequence; and an interpolation processing unit, configured to perform spatial interpolation processing on pixel points to calculate corresponding pixel temperature values.

8. A temperature compensation system for point-by-point chromaticity correction, wherein the system comprises: the temperature compensation method for point-by-point chromaticity correction of an LED display screen according to any one of claims 1-5.

9. A storage medium, wherein 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 according to any one of claims 1-5.

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