LED lattice screen fault detection method, LED lattice screen, medium and terminal
By collecting current line by line and determining the fault type, the LED dot matrix screen can quickly and accurately perform self-diagnosis of faults. This solves the problems of low efficiency and limited accuracy of manual inspection in the existing technology and is applicable to LED dot matrix screens of various specifications and models.
Patent Information
- Application Number
- CN202411740528.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-01-07
AI Technical Summary
Existing fault diagnosis methods for LED dot matrix screens rely on manual inspections, which are inefficient, have limited accuracy, are not timely, and require expensive specialized equipment, making it impossible to achieve real-time monitoring and rapid diagnosis.
By lighting up the LED dot matrix screen row by row, the actual operating current of each row of LEDs is collected. Combined with the fault type and location judgment steps, the fault self-check is realized by using current sampling and algorithms, including the judgment of partial non-lighting, partial constant lighting and ghosting.
It enables simple, timely, accurate and rapid self-diagnosis of LED dot matrix screen faults, saving manpower and equipment costs, and is applicable to LED dot matrix screens of various specifications and models.
Smart Images
Figure CN119274454A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of LED dot matrix screens, and in particular to an LED dot matrix screen fault detection method, an LED dot matrix screen, a medium, and a terminal. Background Art
[0002] LED dot matrix screen, also known as LED matrix screen or dot matrix LED display screen, is an electronic display device composed of multiple LED lamp beads arranged in a specific way, used to display text, patterns and dynamic effects. LED dot matrix screen is widely used in various public places due to its high brightness, low power consumption, long life and flexible display mode, such as traffic information, advertising information playback, etc.
[0003] However, during the long-term operation of LED dot matrix screens, they are affected by many factors, such as ambient temperature, humidity, dust, electromagnetic interference, etc., as well as the natural aging of internal components, which may cause the display screen to malfunction. These faults include but are not limited to damage to the lamp beads, short circuits, module failures, etc., which seriously affect the display effect and service life of the LED display screen. At present, the fault diagnosis method of LED dot matrix screens mainly relies on manual regular inspections. This method has the following shortcomings: 1) Low efficiency of manual inspections: Due to the large area of the LED display screen, manual inspections require a lot of manpower and time. 2) Limited diagnostic accuracy: Manual inspections rely on personal visual judgment and are easily affected by subjective factors and the external environment, resulting in inaccurate diagnostic results. 3) Fault detection is not timely: Regular inspections cannot monitor the operating status of the LED display screen in real time, which may lead to untimely fault detection and affect the normal use of the display screen. 4) Dependence on special equipment: Although special equipment is used to assist in judgment during some inspections, the equipment cost is high and the operation is complicated, which is not conducive to large-scale promotion. Summary of the invention
[0004] In order to solve the shortcomings of the LED dot matrix screen fault detection method in the above-mentioned prior art, the present invention provides an LED dot matrix screen fault detection method, comprising the following steps: The fault determination step is to light up the LED dot matrix screen row by row and collect the actual working current of each row of LED lights. , according to the actual working current of each row of LED lights Determine the row where the fault of the LED dot matrix screen is located; Fault type determination step, the fault types include partial unlit, partial constantly lit and ghosting; lighting up the entire LED dot matrix screen and collecting the working current of lighting up the entire LED dot matrix screen, judging whether the LED dot matrix screen has a fault type of partial unlit according to the actual working current of lighting up the entire LED dot matrix screen; extinguishing the entire LED dot matrix screen and collecting the actual working current of extinguishing the entire LED dot matrix screen, judging whether the LED dot matrix screen has a fault type of partial constantly lit according to the actual working current of extinguishing the entire LED dot matrix screen; if the LED dot matrix screen has a fault and the fault type is not partial unlit and partial constantly lit, then judging the fault type of the LED dot matrix screen is ghosting; The fault location determination step is to light up the LED lamps in the row where the fault is located one by one and collect the actual working current of the single LED lamp, and confirm the fault location according to the actual working current of the single LED lamp.
[0005] In the second aspect, the present invention also provides an LED dot matrix screen, comprising: a control module, an LED module; the control module at least comprises a processing unit and a communication unit; the LED module at least comprises a drive circuit and an LED dot matrix circuit; the processing unit obtains display information sent by an external device through the communication unit, and the processing unit is also electrically connected to the LED dot matrix circuit through the drive circuit; the display information sent by the external device is parsed by the processing unit and converted into a timing signal that can be used by the drive circuit and sent to the drive circuit, and the drive circuit lights up the corresponding LED lamp on the LED dot matrix circuit according to the received timing signal; the current sampling circuit is electrically connected to the processing unit for collecting the actual working current of the LED module; the processing unit comprises a fault detection module, and the fault detection module adopts the LED dot matrix screen fault detection method described in the first aspect embodiment above.
[0006] In a third aspect, the present invention further provides a storage medium, which is a non-volatile storage medium or a non-transient storage medium, on which a computer program is stored, and when the computer program is run by a processor, the LED dot matrix screen fault detection method described in the above-mentioned first aspect embodiment is executed.
[0007] In a fourth aspect, the present invention further provides a terminal, comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor runs the computer program, it executes the LED dot matrix screen fault detection method as described in the embodiment of the first aspect above.
[0008] Based on the above, compared with the prior art, the LED dot matrix screen fault detection method provided by the present invention can simply, timely, effectively and quickly complete the self-inspection of the fault type and position of the LED dot matrix screen through the design of the fault judgment step, the fault type judgment step and the fault position judgment step, and the fault detection method will not affect the normal operation of the LED dot matrix screen; there is no need to rely on manual or external equipment to intervene in the inspection, which greatly saves the time and energy of fault detection, and can be applicable to LED dot matrix screens of various rules and models.
[0009] Other features and beneficial effects of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other beneficial effects of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The positional relationships described in the drawings in the following description are based on the directions in which the components are drawn in the diagrams, unless otherwise specified.
[0011] Figure 1 A flowchart of the steps of a method for detecting a fault of an LED matrix screen provided by an embodiment of the present invention; Figure 2 A circuit schematic diagram of an LED dot matrix screen provided by an embodiment of the present invention; Figure 3 A structural block diagram of a terminal provided by an embodiment of the present invention. DETAILED DESCRIPTION
[0012] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; the technical features designed in different implementation modes of the present invention described below can be combined with each other as long as they do not conflict with each other; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0013] In the description of the present invention, it should be noted that all terms (including technical terms and scientific terms) used in the present invention have the same meanings as those generally understood by ordinary technicians in the field to which the present invention belongs, and should not be understood as limitations on the present invention; it should be further understood that the terms used in the present invention should be understood to have the same meanings as these terms in the context of this specification and in the relevant fields, and should not be understood in an idealized or overly formal sense, unless explicitly defined in this invention.
[0014] In order to solve the shortcomings of the prior art LED dot matrix screen fault diagnosis method that mainly relies on manual regular inspection, such as low efficiency, limited diagnostic accuracy, untimely fault discovery, and reliance on special equipment, the present invention provides an LED dot matrix screen fault detection method to effectively solve the above problems. The technical solution of the present invention is described and illustrated in detail below in combination with different embodiments and drawings of the specification through a variety of specific implementation methods.
[0015] Embodiment 1 In this embodiment, the LED dot matrix screen fault detection method includes the following steps: S1, row fault determination step, lighting up the LED dot matrix screen row by row and collecting the actual working current of each row of LED lights , according to the actual working current of each row of LED lights Determine the row where the fault of the LED dot matrix screen is located.
[0016] In specific implementation, the LED dot matrix screen can be controlled by the control module provided by the LED dot matrix screen to light up row by row, and the actual working current of each row of LED lights can be detected and collected in real time through the corresponding current collection circuit. Then calculate the actual working current of each row of LED lights The faulty row of the LED dot matrix screen is determined by comparing it with the preset normal operating current range. If the actual operating current of a row of LED lights is abnormal (such as too high or too low), it is determined that the row has a fault. It should be noted that the specific judgment method can be set according to actual needs.
[0017] In this embodiment, it is preferred that in the row fault judgment step, the actual working current of each row of LED lamps is Calculate the theoretical current of each LED line The current deviation ratio , if the current deviation ratio If the preset value range is exceeded, the current line is judged to be a faulty line. In this embodiment, the preset value range can be set by the communication unit, and the specific data of the preset value range can be reasonably designed according to actual needs. For example, the preset value range is set to be greater than or equal to 0.5. LED lamps, the theoretical current for lighting a single LED lamp is , then the theoretical current to light up each row of LED lights is It is expressed as: ; The current deviation ratio The formula is: .
[0018] S2, a step of determining the type of fault, wherein the fault types include partial unlighting, partial constant light and ghosting; lighting up the entire LED dot matrix screen and collecting the working current of lighting up the entire LED dot matrix screen, and judging whether the LED dot matrix screen has a fault type of partial unlighting according to the actual working current of lighting up the entire LED dot matrix screen; extinguishing the entire LED dot matrix screen and collecting the actual working current of extinguishing the entire LED dot matrix screen, and judging whether the LED dot matrix screen has a fault type of partial constant light according to the actual working current of extinguishing the entire LED dot matrix screen; if the LED dot matrix screen has a fault and the fault type is not partial unlighting and partial constant light, then judging the fault type of the LED dot matrix screen is ghosting.
[0019] In specific implementation, the fault types in the LED dot matrix screen include three types: partial unlit, partial always lit, and ghosting. Partial unlit refers to the fault that some LED lights in the LED dot matrix screen do not light up when they need to be lit, partial always lit refers to the fault that some LED lights in the LED dot matrix screen are always lit when they do not need to be lit, and ghosting refers to the fault that when some rows of LED lights in the LED dot matrix screen are lit, some LED lights in other rows that should not be lit will follow and light up, thus causing ghosting. In this embodiment, when judging these three fault types, the fault type can be judged simply and quickly by lighting up the whole screen or turning off the whole screen.
[0020] In the process of judging the fault type, the actual working current that lights up the entire LED dot matrix screen can be compared with the preset normal working current range. If the actual working current is significantly lower than the normal range, it is determined that the LED dot matrix screen has a fault type in which some parts are not lit. The actual working current that turns off the entire LED dot matrix screen can be compared with the preset zero current range. If the actual working current is significantly higher than the zero current range, it is determined that the LED dot matrix screen has a fault type in which some parts are always lit. If the LED dot matrix screen has a fault and the fault type is not partially unlit or partially always lit, the fault type of the LED dot matrix screen is determined to be ghosting according to the elimination method. The zero current range can be set according to the actual needs of the LED dot matrix screen, and this embodiment is not limited here.
[0021] As a preferred solution, when judging the fault type of partial non-lighting, if the actual working current of lighting up the entire LED dot matrix screen satisfies , it indicates that the LED dot matrix screen has a partial non-lighting fault; otherwise, it indicates that the LED dot matrix screen does not have a partial non-lighting fault; where, The theoretical working current to light up the entire LED dot matrix screen. To light up the actual working current of the entire LED dot matrix screen, It is a variable constant that can be reasonably adjusted and set through the communication unit. The specific value is designed according to actual needs and is not limited here. For example Between 0.5 and 1.4. That is, this preferred solution determines whether there is a fault type in which part of the LED is not lit by comparing the actual working current with the theoretical working current. Among them, the theoretical working current refers to the working current when the entire LED dot matrix screen is lit under normal and fault-free conditions. The introduction of parameters can effectively avoid misjudgment caused by other current losses. The value of can also be set according to actual needs, and this embodiment does not limit it here.
[0022] When it is determined that the LED dot matrix screen has a partial non-lighting fault, the present embodiment can also calculate the number of non-lighting LED lights in the row where the fault is located by a corresponding formula. Specifically, the number of non-lighting LED lights in the row where the fault is located satisfies: , where Represents a rounded value; is the number of LED lights that are not lit in the row where the fault occurs, is the number of LED lights in the row where the fault is located, The actual working current of the row where the fault is located when lighting up the entire LED dot matrix screen. is the theoretical current of a single LED lamp. It should be noted that, since the measured current value may have slight fluctuations due to various external factors such as line losses, in order to avoid the existence of misjudgment, this embodiment adopts the method of rounding the obtained result value to obtain the number of LED lamps that are not lit in the row where the fault is located. Through the above settings, the accuracy of judgment can be effectively improved, and it can be effectively applied to LED dot matrix screens of various rules and models.
[0023] As another preferred solution, when judging the fault type of partial position being always on, if the actual working current of the entire LED dot matrix screen is greater than , it indicates that there is a fault in the LED dot matrix screen where some parts are always on; if the actual working current of the entire LED dot matrix screen is equal to , it indicates that the LED dot matrix screen does not have a fault of partial constant light; where, is a variable constant, The zero current range is close to 0. Those skilled in the art can adjust the current according to actual needs. The specific parameter values are reasonably designed and are not limited here. When the LED dot matrix screen has a fault that some positions are always on, this embodiment can also determine that the number of LED lights that are always on in the LED dot matrix screen meets: , where Represents a rounded value; is the number of LED lights that are always on in the LED dot matrix screen. In order to extinguish the actual working current of the entire LED dot matrix screen, is the theoretical current of a single LED lamp; then the number of LED lamps that are always on in the row where the fault is located satisfies: , where ; is the number of LED lights that are always on in the row where the fault is located. is the actual total working current of the entire LED dot matrix screen when lighting up the row where the fault is located, is the theoretical current of a single LED lamp.
[0024] As another preferred embodiment, when the fault type of the LED matrix screen is determined to be ghosting, it indicates that after the LED lamps of the preset row are lit, some of the LED lamps of other rows that are not lit will follow and light up; wherein, the number of some of the LED lamps of other rows that are not lit and light up satisfies ; In the formula, ; The number of LEDs that are not lit in other rows follows the number of LEDs that are lit. is the actual total working current of the entire LED dot matrix screen when lighting up the row where the fault is located, is the theoretical current of a single LED lamp, is the number of LED lights in the row where the fault is located. By setting the above simple formula, the number of LED lights in other rows that are not lit during ghosting can be effectively determined.
[0025] S3, a fault location determination step, lighting up the LED lamps in the row where the fault is located one by one and collecting the actual working current of the individual LED lamps, and confirming the fault location according to the actual working current of the individual LED lamps.
[0026] In specific implementation, the fault location can be confirmed by comparing the actual working current of a single LED lamp with the preset normal working current range. If the actual working current of a certain LED lamp is abnormal (such as too high or too low), the LED lamp is determined to be the fault point.
[0027] In an optional embodiment, the fault location can be determined by: when lighting up the LED lamps in the row where the fault is located one by one and collecting the actual working current of the individual LED lamps, if the actual working current of the individual LED lamps before and after lighting up is unchanged, it indicates that the LED lamp has a position failure or a position constant fault; if the actual working current of the individual LED lamp after lighting up is greater than the theoretical current of the individual LED lamp, it indicates that the LED lamp has a ghosting fault. This method can accurately locate the specific fault location of the row where the fault is located.
[0028] This embodiment, through the design of the above-mentioned fault determination step, fault type determination step and fault location determination step, can simply, accurately and quickly complete the self-inspection of the fault type and location of the LED dot matrix screen; there is no need to rely on manual or external equipment to intervene in the inspection, which greatly saves the time and precision of fault detection; and can be effectively applied to LED dot matrix screens of various specifications and models.
[0029] Embodiment 2 See also Figure 2 The embodiment of the present invention further provides an LED dot matrix screen, comprising at least: a control module, an LED module and a current sampling circuit; the control module comprises at least a processing unit and a communication unit; the LED module comprises at least a driving circuit and an LED dot matrix circuit; the processing unit obtains display information sent by an external device through the communication unit, and the processing unit is also electrically connected to the LED dot matrix circuit through the driving circuit; the display information sent by the external device is converted into a timing signal that can be used by the driving circuit after being parsed by the processing unit and sent to the driving circuit, and the driving circuit lights up the corresponding LED lamp on the LED dot matrix circuit according to the received timing signal; the current sampling circuit is electrically connected to the processing unit for collecting the actual working current of the LED module.
[0030] In specific implementation, the control module is the core part of the LED dot matrix screen, which is responsible for receiving and parsing the display information sent by the external device and generating a timing signal. In this embodiment, the control module includes at least a processing unit and a communication unit. The processing unit can select a corresponding microprocessor or microcontroller according to actual needs to parse the received display information through an internal program and convert it into a timing signal recognizable by the drive circuit. The communication unit can be connected to an external device (such as a PC) by wireless or wired communication. For example, wired communication is a universal serial communication interface, such as UART, SPI or I2C, etc., to exchange data with external devices, and wireless communication is, for example, Bluetooth, WiFi, etc.
[0031] The LED module is the display part of the LED dot matrix screen, which is responsible for lighting the LED lamp according to the received control signal to form an image or text display. In this embodiment, the LED module includes a drive circuit and an LED dot matrix circuit. Among them, the drive circuit can use a dedicated LED driver chip, such as a constant current driver chip or a PWM driver chip, which has the characteristics of high precision and low power consumption. The drive circuit receives a timing signal from the processing unit and controls the LED lamp on the LED dot matrix circuit to light up according to the signal. The drive circuit also has safety functions such as overcurrent protection and short circuit protection to ensure that the LED lamp operates under normal working conditions. The specific circuit and connection method of the drive circuit are conventional technologies and will not be described here. The LED dot matrix circuit is composed of a plurality of LED lamps arranged according to a specific rule to form a dot matrix structure. Each LED lamp on the LED dot matrix circuit is connected to the control module through a drive circuit, and can be independently lit or extinguished according to the received timing signal, thereby realizing complex image or text display.
[0032] The current sampling circuit is used to monitor the working current of the LED module in real time, which can not only ensure that the LED lamp works within the safe current range to prevent overcurrent damage; it is also used as a link in fault detection to effectively realize fault detection. The current sampling circuit can be integrated on the control module or independent of the control module. In this embodiment, the current sampling circuit uses a high-precision resistive current sensor or a Hall current sensor to convert the working current of the LED module into a voltage signal and pass it to the processing unit for processing. The specific circuit and connection relationship of the current sampling circuit are also existing conventional technologies and will not be elaborated here.
[0033] Based on the above, the processing unit includes a fault detection module, and the fault detection module adopts the LED dot matrix screen fault detection method as described in the above embodiment 1. Among them, the fault detection module collects the working current of the LED module through the current sampling circuit, and implements fault self-detection based on the working principle of the LED dot matrix screen with the help of the algorithm scheme in the corresponding fault detection method. The specific execution operation mode of the fault detection module has been described in detail in the above embodiment 1 of the method, and will not be elaborated here.
[0034] Embodiment 3 An embodiment of the present invention further provides a storage medium, which is a non-volatile storage medium or a non-transient storage medium, on which a computer program is stored. When the computer program is run by a processor, the LED dot matrix screen fault detection method described in any of the above embodiments is executed.
[0035] In a specific implementation, the storage medium is a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (Flash Memory), a hard disk (Hard Disk Drive, abbreviated as: HDD) or a solid-state drive (SSD), etc.; the storage medium may also include a combination of the above types of memory.
[0036] Embodiment 4 See also Figure 3 An embodiment of the present invention further provides a terminal, which includes a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and the processor executes the LED dot matrix screen fault detection method described in any of the above embodiments when running the computer program.
[0037] In specific implementation, the number of processors may be one or more, and the processor may be a central processing unit (CPU). The processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components and other chips, or a combination of the above-mentioned chips. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.
[0038] The memory and the processor may be communicatively connected via a bus or other means, and the memory stores program instructions executable by at least one processor, and the program instructions are executed by at least one processor so that the processor executes the LED dot matrix screen fault detection method as described in any of the above embodiments.
[0039] In summary, the LED dot matrix screen fault detection method and the LED dot matrix screen, medium, and terminal provided by the present invention, the design of the row fault determination step, the fault type determination step, and the fault location determination step, with the help of current acquisition and algorithm control, can simply, timely, effectively, and quickly complete the self-inspection of the fault type and location of the LED dot matrix screen with little cost change, and the fault detection method will not affect the normal operation of the LED dot matrix screen; there is no need to rely on manual or external equipment to intervene in the inspection, which greatly saves time and energy for fault detection.
[0040] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the present invention can be improved in only one or several aspects, without having to solve all the technical problems listed in the prior art or background technology at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be used as a limitation on the claim.
[0041] Although the terminology such as LED dot matrix screen, row fault determination step, fault type determination step, fault location determination step, etc. is used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention; the terms "first", "second", etc. (if any) in the description and claims of the embodiments of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.
[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for detecting faults of LED dot matrix screens, characterized in that: The following steps are involved: The fault determination step is to light up the LED dot matrix screen row by row and collect the actual working current of each row of LED lights. , according to the actual working current of each row of LED lights Determine the row where the fault of the LED dot matrix screen is located; Fault type determination steps, the fault types include partial unlit, partial always lit and ghosting; Light up the entire LED dot matrix screen and collect the working current of the entire LED dot matrix screen, and judge whether there is a fault type of partial non-lighting of the LED dot matrix screen according to the actual working current of the entire LED dot matrix screen; Turn off the entire LED dot matrix screen and collect the actual working current of the entire LED dot matrix screen when it is turned off. According to the actual working current of the entire LED dot matrix screen when it is turned off, determine whether there is a fault type in which part of the LED dot matrix screen is always on; If the LED dot matrix screen has a fault and the fault type is not partial off light or partial constant light, the fault type of the LED dot matrix screen is determined to be ghosting; The fault location determination step is to light up the LED lamps in the row where the fault is located one by one and collect the actual working current of the single LED lamp, and confirm the fault location according to the actual working current of the single LED lamp.
2. The LED dot matrix screen fault detection method according to claim 1, characterized in that: In the row fault judgment step, according to the actual working current of each row of LED lamps Calculate the theoretical current of each LED line The current deviation ratio , if the current deviation ratio If it exceeds the preset value range, the current line is judged as a fault line.
3. The LED dot matrix screen fault detection method according to claim 2, characterized in that: Assume that each row has LED lamps, the theoretical current for lighting a single LED lamp is , then the theoretical current to light up each row of LED lights is It is expressed as: ; The current deviation ratio The formula is: .
4. The LED dot matrix screen fault detection method according to claim 1, characterized in that: In the fault type determination step, when determining the fault type of partial non-lighting, if the actual working current of lighting up the entire LED dot matrix screen satisfies , it indicates that there is a fault that some parts of the LED dot matrix screen are not bright; Otherwise, it indicates that there is no fault of partial non-lighting of the LED dot matrix screen; where, The theoretical working current to light up the entire LED dot matrix screen. The actual working current to light up the entire LED dot matrix screen , is a variable constant; When it is determined that the LED dot matrix screen has a partial non-lighting fault, the number of non-lighting LED lights in the row where the fault is located satisfies: , where Represents a rounded value; is the number of LED lights that are not lit in the row where the fault occurs, is the number of LED lights in the row where the fault is located, The actual working current of the row where the fault is located when lighting up the entire LED dot matrix screen. is the theoretical current of a single LED lamp.
5. The LED dot matrix screen fault detection method according to claim 1, characterized in that: In the fault type determination step, when determining the fault type of a part of the position being constantly on, if the actual working current of the entire LED dot matrix screen is greater than , it indicates that there is a fault in the LED dot matrix screen where some parts are always on; if the actual working current of the entire LED dot matrix screen is turned off, it is less than , it indicates that the LED dot matrix screen does not have a fault of partial constant light; where, is a variable constant; When the LED dot matrix screen has a fault that some positions are always on, the number of all the LED lights that are always on in the LED dot matrix screen satisfies: , where Represents a rounded value; It is the number of all LED lights that are always on in the LED dot matrix screen. In order to extinguish the actual working current of the entire LED dot matrix screen, is the theoretical current of a single LED lamp; then the number of LED lamps that are always on in the row where the fault is located satisfies: , where ; is the number of LED lights that are always on in the row where the fault is located. is the actual total working current of the entire LED dot matrix screen when lighting up the row where the fault is located, is the theoretical current of a single LED lamp.
6. The LED dot matrix screen fault detection method according to claim 1, characterized in that: In the fault type determination step, when the fault type of the LED dot matrix screen is determined to be ghosting, it indicates that after the LED lights of the preset row are lit, some of the LED lights of other rows that are not lit follow and light up; wherein the number of some of the LED lights of other rows that are not lit and light up meets ; In the formula, ; The number of LEDs that are not lit in other rows follows the number of LEDs that are lit. is the actual total working current of the entire LED dot matrix screen when lighting up the row where the fault is located, is the theoretical current of a single LED lamp, is the number of LED lights in the row where the fault is located.
7. The LED dot matrix screen fault detection method according to claim 1, characterized in that: In the fault location determination step, when the LED lamps in the row where the fault is located are lit one by one and the actual working current of a single LED lamp is collected, if the actual working current of a single LED lamp before and after lighting remains unchanged, it indicates that the LED lamp has a position failure or a position constant failure; if the actual working current of a single LED lamp after lighting is greater than the theoretical current of a single LED lamp, it indicates that the LED lamp has a ghosting failure.
8. An LED dot matrix screen, characterized in that: include: Control module, LED module and current sampling circuit; The control module at least includes a processing unit and a communication unit; The LED module at least includes a driving circuit and an LED dot matrix circuit; the processing unit obtains display information sent by an external device through a communication unit, and the processing unit is also electrically connected to the LED dot matrix circuit through the driving circuit; the display information sent by the external device is converted into a timing signal that can be used by the driving circuit after being parsed by the processing unit and sent to the driving circuit, and the driving circuit lights up the corresponding LED lamp on the LED dot matrix circuit according to the received timing signal; the current sampling circuit is electrically connected to the processing unit for collecting the actual working current of the LED module; the processing unit includes a fault detection module, and the fault detection module adopts the LED dot matrix screen fault detection method as described in any one of claims 1-7.
9. A storage medium, characterized in that: The storage medium is a non-volatile storage medium or a non-transient storage medium, on which a computer program is stored. When the computer program is executed by a processor, the LED dot matrix screen fault detection method according to any one of claims 1 to 7 is executed.
10. A terminal, characterized in that: It comprises a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and the processor executes the LED dot matrix screen fault detection method according to any one of claims 1 to 7 when running the computer program.