A handheld LED fault detection device

Abstract

The present invention discloses a handheld LED fault detection device. A true random number generator is provided in a micro control center. The true random number generator interferes with the LED driving signal generated by the micro control center, and the micro control center generates a random detection driving signal. The driving signal output port of the fault detection device is connected to the data input port of the LED display module to be detected, and the driving signal input port of the fault detection device is connected to the data output port of the LED display module to be detected. The detection driving signal generated by the true random number generator is output through the driving signal output port and transmitted to the LED display module to be detected through the data input port. The micro control center receives the response signal transmitted from the data output port and the driving signal input port, and the micro control center executes the fault detection process according to the response signal. After obtaining the verification result of the fault detection process, the fault state of the LED display module is analyzed and obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of LED fault detection, and more specifically, to a handheld LED fault detection device. Background Art

[0002] An LED display module is an electronic display device that uses light-emitting diodes (LEDs) as display elements. It consists of an array of multiple LED lamp beads, and displays images, texts, or videos by controlling the lighting, extinguishing, and brightness of each lamp bead. Each LED lamp bead can emit monochromatic light, such as red, green, blue, etc. By combining these basic colors, various color effects can be produced. LED display modules have excellent high-brightness characteristics, and can maintain a clear and visible display effect even in strong outdoor light environments. Moreover, their energy consumption is relatively low, the service life of LED lamp beads is extremely long, reducing the frequency of maintenance and replacement, thereby reducing the long-term operation cost. In addition, LED display modules can display rich colors and delicate gradient effects, meeting various display requirements from text information to high-resolution images, and at the same time supporting dynamic display and real-time information update. These comprehensive characteristics make LED display modules the preferred technology for various application scenarios such as commercial advertising, public information display, stage backgrounds, sports event scoreboards, and urban landscape lighting. With the continuous progress of technology, the application scope of LED display modules is still expanding continuously, and their trend of intelligence and networking also makes them occupy an important position in the future display technology field.

[0003] Among them, the existing fault detection of LED display modules is usually completed through self-check, that is, by using the self-check algorithm of the built-in driver IC in the LED display module to achieve the fault detection of the LED display module. However, this fault detection method not only increases the hardware and software requirements of the LED display module itself, but also can only detect the open-circuit and short-circuit faults of the LED lamp beads, and cannot detect situations such as driver IC faults, power input faults, and drive signal input faults, resulting in low maintenance efficiency of the LED display module. Summary of the Invention

[0004] In order to overcome the deficiency of low efficiency in existing LED fault detection, the present invention provides a handheld LED fault detection device.

[0005] The technical solution of the present invention is as follows:

[0006] A handheld LED fault detection device,

[0007] A true random number generator is set in the micro control center, and the true random number generator interferes with the LED drive signal generated by the micro control center, and the micro control center generates a random detection drive signal.

[0008] The drive signal output port of the fault detection device is connected to the data input port of the LED display module to be detected, and the drive signal input port of the fault detection device is connected to the data output port of the LED display module to be detected.

[0009] The detection drive signal generated by the true random number generator is output through the drive signal output port and transmitted to the LED display module to be detected through the data input port. The micro control center receives the response signal transmitted from the data output port and the drive signal input port.

[0010] The micro control center executes the fault detection process according to the response signal, and analyzes the fault status of the LED display module after obtaining the verification result of the fault detection process.

[0011] The fault status of the LED display module is displayed to the user through the display screen.

[0012] The present invention uses a micro control center with a built-in true random number generator to generate a random detection drive signal. The detection drive signal is transmitted to the data input port of the LED display module to be detected through the drive signal output port of the fault detection device. At the same time, the drive signal input port of the device receives the response signal from the data output port of the LED display module. The micro control center executes the fault detection process by analyzing the response signal fed back by the LED display module, so as to judge the fault situation of the LED display module. Compared with the fault detection functional module set in the LED display module, this separate LED fault detection device can first reduce the manufacturing cost of the LED display module. Since the LED display module does not have a corresponding fault detection functional module, it directly reduces the design and hardware costs of this part (such as integrated design and hardware costs), and at the same time reduces the requirements for the control chip of the LED display module, avoiding the use of higher-cost chips. Secondly, as a separate device, it can be reused in different LED display systems and applications, increasing the use value of the device and having strong flexibility, not being restricted by the design of specific LED modules. Moreover, the independent fault detection device will not interfere with the normal operation of the LED display module during the detection process, ensuring the normal use of the LED display module, and can also more accurately locate the problem module, avoiding misjudgment caused by the failure of the integrated detection module or replacing the entire LED display module. The independent fault detection device can be quickly deployed to the LED display module to be detected, and can be removed after detection, which is convenient for on-site operation. In addition, the independent detection device is easier to upgrade software and hardware.

[0013] The fault detection device generates a detection drive signal of the same type as the control signal of the LED display module to be detected according to the input parameters of the LED display module and the corresponding control drive signal generation protocol, etc. However, this detection drive signal is processed by a true random number, and its drive content has true randomness. On the other hand, the LED display module receives the detection drive signal and starts to work normally as if it were receiving an external control signal, including the normal operation of the drive IC in the LED display module. The LED display module receives the corresponding detection drive signal and starts to work according to the content of the detection drive signal. In this process, the driving component of the LED display module generates a working drive signal for controlling each light-emitting diode according to the detection drive signal. The working drive signal is transmitted to the fault detection device according to the communication protocol content (the fault detection device and the LED display module adopt the same communication protocol, which has the definition of signal mutual transmission, so that the working drive signal can be transmitted to the fault detection device when the fault detection device is connected to the LED display module), the built-in signal feedback mechanism (a feedback circuit is integrated in the LED display module, and when the fault detection device is connected to the LED display module, the LED display module can transmit the working drive signal to the fault detection device), and the algorithm (the detection drive signal sent by the fault detection device includes an algorithm for returning a response signal to obtain each feature in the working drive signal. When the fault detection device is connected to the LED display module, the LED display module can transmit the feature information of the working drive signal to the fault detection device) and other feedback mechanisms, so that the micro control center can perform the fault detection process.

[0014] For the above-mentioned handheld LED fault detection device, the fault detection device obtains the parameter information of the LED display module according to the user's selection content.

[0015] The parameter information of the LED display module includes the type information of the drive IC of the LED display module and the channel number information of the LED display module.

[0016] The fault detection device generates a fault detection signal of variable length according to the obtained parameter information of the LED display module.

[0017] Different drive ICs have different electrical characteristics and communication protocols. Therefore, it is necessary to know the type of the drive IC of the LED display module to generate corresponding effective drive signals. On the other hand, the number of channels of the module determines the complexity and distribution of the drive signal. Therefore, the generated fault detection signal takes into account the number of channels of each LED display module to ensure that the signal can cover all channels and trigger the corresponding LED beads.

[0018] For the above-mentioned handheld LED fault detection device, the true random number generator generates a true random number.

[0019] The signal processor of the micro control center acquires true random numbers and maps the true random numbers into drive parameters. The signal processor uses the mapped drive parameters to generate a detection drive signal.

[0020] Or,

[0021] The signal processor of the micro control center generates an initial drive signal according to preset drive parameters.

[0022] The true random number generator generates true random numbers.

[0023] The signal processor maps the true random numbers to the comparison register of the signal processor.

[0024] The comparison register acquires the initial drive signal and modulates the signal according to the true random numbers to generate a detection drive signal.

[0025] The signal processor of the micro control center acquires the true random numbers generated by the true random number generator. These true random numbers are directly mapped into the drive parameters of the LED module, such as the duty cycle of the PWM signal, display data, etc. The signal processor uses these mapped parameters to generate a detection drive signal to control the behavior of the LED module. Since the true random numbers are used immediately during the signal generation process in this method, it can respond quickly and generate changing drive signals in real time, reducing additional signal processing steps and simplifying the system design.

[0026] In another case, the signal processor of the micro control center generates an initial drive signal according to preset drive parameters. The true random numbers generated by the true random number generator are acquired by the signal processor and mapped into the comparison register of the signal processor. The comparison register modulates the initial drive signal according to these true random numbers to generate the final detection drive signal. This method of modulating the drive signal applies random changes to a base signal to introduce additional dynamics and complexity, allowing for fine adjustment and optimization of the base signal, creating more complex signal patterns, providing higher controllability, and controlling certain specific characteristics of the signal while maintaining randomness through the combination of preset parameters and random modulation.

[0027] Either of the above two methods for generating the detection drive signal can be selected according to application requirements and design considerations, or can also be selected according to the different objects of fault detection.

[0028] For the above-mentioned handheld LED fault detection device, the micro control center is connected to a bus driver, the bus driver is connected to a first hub, and the first hub is connected to the data input port of the LED display module.

[0029] The micro control center is connected to a bus receiver, the bus receiver is connected to a second hub, and the second hub is connected to the data output port of the LED display module.

[0030] The first hub is provided with a drive signal input port. The detection drive signal generated by the micro control center is optimized by a bus driver and then transmitted to the first hub and input into the data input port of the LED display module, so that the LED display module receives the detection drive signal processed by true random numbers.

[0031] The LED display module obtains the received detection drive signal. According to the drive control logic of the LED display module itself, it outputs a control signal to each LED display unit. The control signal is output from the data output port, received by the second hub, and after being optimized by the bus receiver, it is transmitted to the micro control center for analysis and processing.

[0032] The bus driver provides signal amplification, shaping, and isolation functions to enhance the signal, ensure signal quality, and ensure stable and reliable signal transmission from the micro control center to the hub. The hub simplifies the wiring and improves the scalability and flexibility of signal transmission. Compared with the direct transmission through the data transmission port, the combination of the bus driver and the hub, and the hub and the bus receiver enables the device to adapt to LED display modules of different scales and manage the transmitted signals more precisely, including signal timing control, synchronization, and network connection, etc., which is beneficial to subsequent fault detection, analysis, and processing. At the same time, the signal transmission is implemented by this combined structure, which is beneficial to improving the efficiency of sending and receiving management signals and ensuring the efficient execution of the fault detection process.

[0033] The above-mentioned handheld LED fault detection device is provided with a display screen for users to select fault detection content and display fault detection results.

[0034] The display screen is an OLED display screen, and the display screen is provided with an IIC interface, and the IIC interface is connected to the micro control center.

[0035] The above-mentioned handheld LED fault detection device is provided with several buttons, including a first button, a second button, a third button, and a fourth button.

[0036] The first button is connected to the power supply and controls the startup of the fault detection device.

[0037] The second button and the third button are respectively the up and down adjustment buttons for selecting content on the display screen, used for users to select detection content.

[0038] The fourth button is a selection button for users to select and confirm detection content.

[0039] The above-mentioned handheld LED fault detection device, the fault detection process includes the LED lamp bead fault detection process,

[0040] The micro control center sends an LED lamp bead fault detection signal to the LED display module,

[0041] The LED display module receives the LED lamp bead fault detection signal, and the LED display module starts the driving IC self-check process,

[0042] The control module of the LED display module sends a detection signal to the driving IC of the LED display module,

[0043] The driving IC obtains the detection signal and runs the lamp bead bad point detection process. The driving IC scans each LED lamp bead on the LED display module, the driving IC collects and obtains the status data of each LED lamp bead, and the driving IC analyzes and determines whether there are bad points according to the built-in self-check algorithm.

[0044] Once the driving IC detects a bad point, it marks this information and generates an LED lamp bead fault detection result signal,

[0045] The driving IC transmits the LED lamp bead fault detection result signal to the micro control center.

[0046] The LED fault detection device uses the built-in LED bad point detection module of the driving IC of the LED display module to detect the fault condition of the LED lamp beads. The micro control center sends an LED lamp bead fault detection signal to the LED display module, and the LED display module receives the LED lamp bead fault detection signal and starts the driving IC self-check process. Each driving IC of the LED display module is provided with a bad point detection module. The driving IC monitors the current output to each LED lamp bead or monitors the voltage across each LED lamp bead or the circuit condition (open circuit or short circuit) of each LED lamp bead, and compares the detected current value or voltage value with a preset threshold. The LED lamp beads with the current value or voltage value exceeding the preset threshold, or the LED lamp beads with the circuit condition of open circuit or short circuit are regarded as bad points. After the driving IC detects a bad point, it marks the corresponding LED lamp bead and obtains the bad point position through address mapping, and generates an LED lamp bead fault detection result signal with information such as the bad point information and the corresponding bad point position, and transmits it to the micro control center through the connection between the LED display module and the LED fault detection device.

[0047] The above-mentioned handheld LED fault detection device, the fault detection process includes the driving IC fault detection process,

[0048] The true random number generator generates true random numbers,

[0049] The signal processor of the micro control center obtains true random numbers and arbitrarily classifies the true random numbers into three parts, and maps the three parts of true random numbers into R, G, and B color signals.

[0050] The signal processor uses the three color signals after mapping to generate a detection drive signal and transmits it to the driver IC of the LED display module.

[0051] The detection drive signal generated by mapping the true random numbers propagates to each color channel of the LED display module through the RGB drive signal generated by the driver IC of the LED display module.

[0052] The RGB drive signal generated by the driver IC of the LED display module is transmitted to the micro control center for analysis. The micro control center compares the RGB drive signal with the three color signals in the detection drive signal. If at least one of the signal data of the R, G, and B colors in the RGB drive signal matches the signal data of the R, G, and B colors in the three color signals of the detection drive signal, and at least one of the signal data of the colors does not match the signal data of the R, G, and B colors in the three color signals of the detection drive signal, the micro control center determines that there is a fault in the driver IC of the LED display module.

[0053] The true random number generator of the micro control center generates a number of true random numbers, and the true random numbers process the detection drive signal generated by the micro control center. During this period, for the color parameter content part of the LED display module, the true random numbers are evenly and arbitrarily divided into three parts, and then the three parts process the signals of the R, G, and B colors respectively, and finally form a part of the detection drive signal. After the detection drive signal is transmitted to the LED display module through the drive signal output port and the data input port, the driver IC of the LED display module receives the drive content (control signal) regarding the R, G, and B colors, and generates a corresponding drive signal - RGB drive signal for controlling the colors of the LED beads of the LED display module. The RGB drive signal will control the colors of each bead through each color channel of the LED display module. On the other hand, the RGB drive signal generated by the driver IC of the LED display module will also be transmitted to the micro control center of the fault detection device through the data output port and the drive signal input port. After receiving the RGB drive signal, the micro control center compares and matches it with the three color signals in the corresponding detection drive signal. If at least one of the signal data of the R, G, and B colors matches the signal data of the three color signals of the detection drive signal, and at the same time at least one of the signal data of the R, G, and B colors does not match the signal data of the three color signals of the detection drive signal, it can be determined that there is a fault in the driver IC of the LED display module.

[0054] Since each LED bead in the LED display module consists of three independent light-emitting diodes or channels, namely R, G, and B, for an LED bead, R, G, and B are all independently controlled, and different colors have different channels. Therefore, the three color channels of R, G, and B are independently processed inside the driving IC, and the driving IC also processes these channels independently. Thus, the existence of faults is also independent. In this case, if the signals of the three color channels cannot match the three-color signal data for detecting the driving signal, it indicates that there are extensive signal transmission problems, which may not be solely a problem of the LED driving IC. If the signal data of at least one color channel match and the signal data of other color channels do not match, this indicates that the non-matching color channel and its related circuit part in the driving IC are faulty, which means that the driving IC has a fault.

[0055] In the above-mentioned handheld LED fault detection device, the fault detection process includes a power input fault detection process.

[0056] The micro control center outputs a stable driving signal with a low level for a certain period of time to the LED display module.

[0057] The true random number generator generates true random numbers.

[0058] The signal processor of the micro control center obtains the true random numbers and maps the true random numbers to preset driving parameters to generate a detection driving signal.

[0059] The detection driving signal generated by the mapping of the true random numbers is transmitted to the driving IC of the LED display module.

[0060] The driving IC obtains the content information of the detection driving signal and generates a working driving signal for controlling the LED beads. The working driving signal is transmitted to the micro control center through the data output port and the driving signal input port.

[0061] The micro control center obtains the working driving signal and compares the working driving signal with the detection driving signal to determine whether there are deviations or abnormalities between the working driving signal and the detection driving signal.

[0062] If the micro control center detects deviations or abnormalities between the working driving signal and the detection driving signal, it determines that there is a fault in the power input of the LED display module. If the micro control center detects that the working driving signal and the detection driving signal are consistent, it determines that the power input of the LED display module is normal.

[0063] Before transmitting the detection drive signal, it is necessary to establish a stable electrical environment. Therefore, the micro control center first continuously outputs a stable drive signal with a low level for a certain period of time to the LED display module, ensuring that all subsequent drive signals are in the low level state, eliminating any possible interference or noise caused by the drive signal, and at the same time being able to avoid the working drive signal level generated by the LED display module from being coupled to the power supply circuit of the LED display module (level coupling refers to the phenomenon that the output signal of one circuit affects another circuit through electrical or electromagnetic means. When detecting the power supply circuit, if the residual or original drive signal of the LED display module is still active, it may be coupled to the power supply circuit through inductance or capacitance, resulting in inaccurate detection results. Therefore, continuously outputting a low level signal for a period of time can avoid the occurrence of the coupling phenomenon).

[0064] The true random number generator of the micro control center generates a number of true random numbers. The true random numbers process the detection drive signal generated by the micro control center to generate a detection drive signal. The detection drive signal is transmitted to the LED display module through the drive signal output port and the data input port. The working drive signal generated by the LED display module is transmitted to the micro control center through the data output port and the drive signal input port. The micro control center compares the data content of the working drive signal. If the two are consistent, it is determined that there is no fault in the power input. If there is a deviation or difference between the two, it is determined that there is a fault in the power input. Since a stable low level signal has been output to the LED display module at the front end, if the power input of the LED display module is normal, the drive IC of the LED display module should be able to receive a stable and undisturbed detection drive signal and generate an accurate working drive signal accordingly. If there is a problem with the power input, resulting in unstable power supply to the LED display module and affecting the performance of the drive IC, thus affecting the integrity of the working drive signal. Therefore, by comparing the data content of the working drive signal and the detection drive signal, it is possible to know whether there is a problem with the power input of the LED display module.

[0065] For the above-mentioned handheld LED fault detection device, the fault detection process includes a drive signal input fault detection process.

[0066] The true random number generator generates true random numbers.

[0067] The signal processor of the micro control center acquires the true random numbers and arbitrarily classifies the true random numbers into three parts, mapping the three parts of true random numbers into the R, G, and B color signals.

[0068] The signal processor uses the mapped three-color signals to generate a detection drive signal and transmits it to the drive IC of the LED display module.

[0069] The detection drive signal generated by true random number mapping is propagated to each color channel of the LED display module through the RGB drive signal generated by the drive IC of the LED display module.

[0070] The RGB drive signal generated by the drive IC of the LED display module is transmitted to the micro control center for analysis. The micro control center compares the RGB drive signal with the three-color signals in the detection drive signal. If none of the signal data of the three colors (R, G, and B) in the RGB drive signal matches the signal data of the three colors (R, G, and B) in the detection drive signal, the micro control center determines that there is a fault in the drive input of the LED display module.

[0071] The true random number generator of the micro control center generates a number of true random numbers, which process the detection drive signal generated by the micro control center. During this period, for the color parameter content part of the LED display module, the true random numbers are evenly divided into three parts on average, and then the three parts process the signals of the three colors (R, G, and B) respectively, and finally form a part of the detection drive signal. After the detection drive signal is transmitted to the LED display module through the drive signal output port and the data input port, the drive IC of the LED display module receives the drive content (control signal) regarding the three colors (R, G, and B), generates a corresponding drive signal - RGB drive signal for controlling the color of the LED beads of the LED display module, and the RGB drive signal controls the color of each bead through each color channel of the LED display module. On the other hand, the RGB drive signal generated by the drive IC of the LED display module is also transmitted to the micro control center of the fault detection device through the data output port and the drive signal input port. After receiving the RGB drive signal, the micro control center compares and matches it with the three-color signals in the corresponding detection drive signal. If the signal data of the three colors (R, G, and B) do not match the signal data of the three-color signals of the detection drive signal, it can be determined that there is a fault in the drive input of the LED display module.

[0072] For the present invention according to the above solution, its beneficial effects are as follows.

[0073] 1. The handheld LED fault detection device of the present invention realizes the fault detection of the LED display module (including LED display screens, LED light strings, etc.) through the comparison of drive signals, and can distinguish and troubleshoot four types of fault conditions. Only by connecting the drive signal transmission port of the LED fault detection device to the data transmission port of the LED display module, and then inputting some parameter information (such as the number of channels, etc.) of the LED display module to be detected, the fault condition of the LED display module can be known through the display screen, greatly reducing the labor cost of fault inspection and maintenance of the LED display module, effectively shortening the fault troubleshooting time, and reducing the problems caused by the use interruption due to the fault of the LED display module (such as the LED traffic screen, which can quickly know the fault condition, enabling the maintenance personnel to repair as soon as possible and ensuring traffic to the greatest extent).

[0074] 2. The handheld LED fault detection device of the present invention uses the LED detection drive signal generated by taking the true random number output by the true random number generator as the modulation content, avoiding accidental situations and improving the correctness and rationality of fault detection and judgment.

[0075] 3. The handheld LED fault detection device of the present invention does not need to pay attention to the number of LED display modules within the range to be measured. The lines between the LED display modules are in a connected state, and the LED display module and the LED fault detection device form a closed-loop connection. The detection drive signal of the LED fault detection device can be transmitted to any LED display module, and the working drive signal output by the LED display module can be transmitted to the LED fault detection device. Then, the range of the LED display module with faults can be detected, narrowing the troubleshooting range and accelerating the fault repair speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0077] Figure 1 It is a schematic connection structure diagram of the usage state of the LED fault detection device.

[0078] Figure 2 It is a schematic port structure diagram of the connection between the LED fault detection device and the LED display module.

[0079] Figure 3 It is a schematic key circuit structure diagram of the LED fault detection device.

[0080] Figure 4Schematic diagram of the pin connection structure of the micro control center of the LED fault detection device.

[0081] Figure 5 Fault detection flow chart of the LED fault detection device.

[0082] Among them, each reference numeral in the figure:

[0083] 1. LED fault detection device; 2. LED display module. Detailed implementation mode

[0084] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0085] A handheld LED fault detection device, as Figure 1 , Figure 4 shown, a true random number generator is provided in the micro control center. The true random number generator interferes with the LED drive signal generated by the micro control center. The micro control center generates a random detection drive signal. The drive signal output port of the fault detection device 1 is connected to the data input port of the LED display module 2 to be detected, and the drive signal input port of the fault detection device is connected to the data output port of the LED display module to be detected. The detection drive signal generated by the true random number generator is output through the drive signal output port and transmitted to the LED display module to be detected through the data input port. The micro control center receives the response signal transmitted from the data output port and the drive signal input port. The micro control center executes the fault detection process according to the response signal, analyzes the fault state of the LED display module after obtaining the verification result of the fault detection process, and the fault state of the LED display module is displayed to the user through the display screen.

[0086] The fault detection device obtains the LED display module parameter information according to the user's selection content. The LED display module parameter information includes the drive IC type information of the LED display module and the channel number information of the LED display module. The fault detection device generates a fault detection signal with an indefinite length according to the obtained LED display module parameter information.

[0087] The true random number generator generates a true random number. The signal processor of the micro control center obtains the true random number and maps the true random number into the drive parameters. The signal processor uses the mapped drive parameters to generate a detection drive signal.

[0088] Or,

[0089] The signal processor of the micro control center generates an initial drive signal according to preset drive parameters, the true random number generator generates true random numbers, the signal processor maps the true random numbers to the comparison register of the signal processor, and the comparison register obtains the initial drive signal and modulates the signal according to the true random numbers to generate a detection drive signal.

[0090] In one embodiment, initialize the micro control center configured with a true random number generator. The pin of the true random number generator has the PWM (pulse width modulation) function. Set the frequency of the PWM channel to 1 kHz and the resolution to 8 bits. Enable the clock module connected to the true random number generator and set the true random number generator to the continuous true random number generation mode. Call the API (application programming interface) of the true random number generator to obtain an 8-bit true random number, which will be used to modulate the PWM signal (in other embodiments, the true random number modulates the corresponding drive signal). Map the 8-bit true random number (range 0 - 255) to the duty cycle of the PWM, and use the formula duty_cycle = (random_num * 100) / 255 to calculate the duty cycle (duty_cycle is the duty cycle and random_num is the true random number). Set the duty cycle register of the PWM module to the calculated value to generate a PWM signal. The PWM signal drives the LED display module through the PWM output pin of the micro control center to control the brightness of the LED. Periodically call the true random number and update the PWM duty cycle to achieve dynamic changes in the LED brightness.

[0091] In another embodiment, initialize the micro control center configured with a true random number generator. The pin of the true random number generator has the PWM (pulse width modulation) function. Set the frequency of the PWM channel to 1 kHz and the resolution to 8 bits. Without relying on the true random number, the micro control center directly generates a PWM signal with a fixed duty cycle (such as 50%), and the frequency is 1 kHz. Obtain an 8-bit true random number at the middle moment of each PWM cycle, and use the true random number to adjust some parameters of the basic drive signal, change the duty cycle of the PWM, or insert a short flash at a specific time point. If the true random number is greater than 128, increase the PWM duty cycle by 5% in the next cycle, otherwise decrease it by 5%. Apply the modulated parameters to the initial drive signal to generate the final detection drive signal. Update the duty cycle register of the PWM module, apply the modulated duty cycle, and the modulated PWM signal drives the channel of the LED display module through the pin of the micro control center.

[0092] The micro control center is connected to a bus driver, the bus driver is connected to a first hub, the first hub is connected to the data input port of the LED display module, the micro control center is connected to a bus receiver, the bus receiver is connected to a second hub, and the second hub is connected to the data output port of the LED display module.

[0093] In this embodiment, as Figure 2 shown, a bus driver is constituted by a 74HC245D, and the output of the bus driver is connected to the interface P2 of a HUB206 (i.e., the first hub). The 74HC245D serves as a bus transmitter of signals and is connected to the drive signal input (which is also the data input port) of the LED display module through the HUB206 interface P2, for sending data and control instructions to the LED display module. A bus receiver is constituted by a 74HC245D, and a second hub is constituted by a HUB206. The input port of the bus receiver is connected to the interface P1 of a HUB206 (the second hub). The 74HC245D serves as the bus receiver and is connected to the drive signal output (which is also the data output port) of the LED display module through the HUB206 interface P1, for receiving the data returned by the LED display module.

[0094] The LED fault detection device is provided with a display screen for the user to select the fault detection content and display the fault detection result. The display screen is an OLED display screen, and the display screen is provided with an IIC interface, and the IIC interface is connected to the micro control center.

[0095] In this embodiment, the display screen uses an OLED screen with a resolution of 128×64, for displaying the fault detection result of the LED display module. The first pin of the main chip of the display screen is grounded, the second pin of the main chip of the display screen is connected to the 3.3V power supply, the third pin of the main chip of the display screen is connected to the micro control center through the eighth resistor, and the fourth pin of the main chip of the display screen is connected to the clock module through the seventh resistor. Among them, the third pin of the main chip of the display screen is connected to the SDA line of the I2C bus, that is, a bidirectional data line is used for connection between the main chip and the micro control center, so that the fault detection result analyzed and processed by the micro control center can be transmitted to the display screen for display. The data and control instructions (selection of the fault detection content) generated by the user through the display screen are transmitted to the micro control center through the bidirectional data line. The fourth pin of the main chip of the display screen is connected to the SCL line of the I2C bus, that is, the display screen is connected to the clock module to provide a clock signal to the display screen to ensure that the bidirectional data transmission between the third pin of the main chip and the micro control center is synchronous transmission. During the process of signal transmission between the display screen and the micro control center, the specific operations of the SDA line and the SCL line are as follows: when the SCL line is at a high level, the SDA line jumping from a high level to a low level indicates the start of data transmission; when the SCL line is at a high level, the SDA line jumping from a low level to a high level indicates the end of data transmission, so as to ensure the accuracy and synchronization of signal transmission.

[0096] The LED fault detection device is provided with several buttons, including a first button, a second button, a third button and a fourth button. The first button is connected to the power supply and controls the startup of the fault detection device. The second button and the third button are respectively the up and down adjustment buttons for selecting content on the display screen, used for the user to select the detection content. The fourth button is a selection button, used for the user to select and confirm the detection content.

[0097] In this embodiment, as Figure 3 shown, the first button circuit corresponds to the KEY1 circuit, the second button circuit corresponds to the KEY2 circuit, the third button circuit corresponds to the KEY3 circuit, and the fourth button circuit corresponds to the KEY4 circuit. The KEY1 circuit, KEY2 circuit, KEY3 circuit, and KEY4 circuit all have the same structure: one end of the button switch is connected to one end of a certain capacitor and grounded, and the other end of the button switch is respectively connected to the power supply, the output end, and the other end of a certain capacitor. Among them, the output end of the KEY1 circuit is connected to the power supply. When the first button is pressed, the electrical signal generated by the button switch is transmitted to the power supply through the output end, so that the power supply supplies power or stops supplying power to structures such as the micro control center and the display screen, realizing the startup or shutdown of the fault detection device; The KEY2 circuit and the KEY3 circuit are respectively the control circuits of the up arrow key and the down arrow key. When the second button or the third button is pressed, the electrical signal generated by the button switch is transmitted to the display screen through the output end, controlling the position of the cursor on the display screen to enable the user to select and input the detection content; The KEY4 circuit is the confirmation key circuit. When the fourth button is pressed, the electrical signal generated by the button switch is transmitted to the display screen through the output end, and the display screen generates detection data or detection control instructions based on the existing selected detection content and transmits them to the micro control center.

[0098] The fault detection process includes the LED lamp bead fault detection process. The micro control center sends an LED lamp bead fault detection signal to the LED display module. After receiving the LED lamp bead fault detection signal, the LED display module starts the driver IC self-check process and uses the function of its built-in dead pixel detection module to realize the LED lamp bead dead pixel detection. The control module of the LED display module sends a detection signal to the driver IC of the LED display module. The driver IC obtains the detection signal and runs the lamp bead dead pixel detection process. The driver IC scans each LED lamp bead on the LED display module, the driver IC collects and obtains the status data of each LED lamp bead, the driver IC analyzes and determines whether there are dead pixels according to the built-in self-check algorithm. Once the driver IC detects dead pixels, it marks this information and generates an LED lamp bead fault detection result signal, and the driver IC transmits the LED lamp bead fault detection result signal to the micro control center.

[0099] The fault detection process includes the driving IC fault detection process. The true random number generator generates true random numbers. The signal processor of the micro control center obtains the true random numbers and arbitrarily classifies the true random numbers into three parts. The three parts of true random numbers are mapped into R, G, and B color signals. The signal processor uses the mapped three-color signals to generate a detection driving signal and transmits it to the driving IC of the LED display module. The detection driving signal generated by the mapping of the true random numbers propagates to each color channel of the LED display module through the RGB driving signal generated by the driving IC of the LED display module. The RGB driving signal generated by the driving IC of the LED display module is transmitted to the micro control center for analysis. The micro control center makes the RGB driving signal compare with the three-color signals in the detection driving signal. If at least one of the signal data of the three colors R, G, and B in the RGB driving signal matches the signal data of the three colors R, G, and B in the detection driving signal, and at least one of the signal data does not match the signal data of the three colors R, G, and B in the detection driving signal, the micro control center determines that there is a fault in the driving IC of the LED display module.

[0100] The fault detection process includes the power input fault detection process. The micro control center outputs a stable driving signal with a low level for a certain period of time to the LED display module. The true random number generator generates true random numbers. The signal processor of the micro control center obtains the true random numbers and maps the true random numbers to preset driving parameters to generate a detection driving signal. The detection driving signal generated by the mapping of the true random numbers is transmitted to the driving IC of the LED display module. The driving IC obtains the content information of the detection driving signal and generates a working driving signal for controlling the LED lamp beads. The working driving signal is transmitted to the micro control center through the data output port and the driving signal input port. The micro control center obtains the working driving signal and compares the working driving signal with the detection driving signal to determine whether there is a deviation or abnormality between the working driving signal and the detection driving signal. If the micro control center detects a deviation or abnormality between the working driving signal and the detection driving signal, it determines that there is a fault in the power input of the LED display module. If the micro control center detects that the working driving signal and the detection driving signal are consistent, it determines that the power input of the LED display module is normal.

[0101] The fault detection process includes a drive signal input fault detection process. A true random number generator generates true random numbers. The signal processor of the micro control center obtains the true random numbers and arbitrarily classifies the true random numbers into three parts. The three parts of true random numbers are mapped into R, G, and B color signals. The signal processor uses the mapped three-color signals to generate a detection drive signal and transmits it to the drive IC of the LED display module. The detection drive signal generated by the mapping of the true random numbers is propagated to each color channel of the LED display module through the RGB drive signal generated by the drive IC of the LED display module. The RGB drive signal generated by the drive IC of the LED display module is transmitted to the micro control center for analysis. The micro control center makes the RGB drive signal compare with the three-color signals in the detection drive signal. If none of the signal data of the R, G, and B colors in the RGB drive signal match the signal data of the R, G, and B colors in the three-color signals of the detection drive signal, the micro control center determines that there is a fault in the drive input of the LED display module.

[0102] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A handheld LED fault detection device, characterized in that: A true random number generator is set in the micro control center. The true random number generator interferes with the LED drive signal generated by the micro control center. The micro control center generates a random detection drive signal. The drive signal output port of the fault detection device is connected to the data input port of the LED display module to be detected, and the drive signal input port of the fault detection device is connected to the data output port of the LED display module to be detected. The detection drive signal generated by the true random number generator is output through the drive signal output port and transmitted to the LED display module to be detected through the data input port. The micro control center receives the response signal transmitted from the data output port and the drive signal input port. The micro control center executes the fault detection process according to the response signal, obtains the verification result of the fault detection process, and then analyzes and obtains the fault status of the LED display module. The fault status of the LED display module is displayed to the user through the display screen; True random number generator generates true random numbers, The signal processor of the micro control center obtains the true random number and maps the true random number to the driving parameter. The signal processor uses the mapped driving parameter to generate a detection driving signal. or, The signal processor of the micro control center generates the initial drive signal according to the preset drive parameters. True random number generator generates true random numbers, The signal processor maps the true random number to the comparison register of the signal processor. The comparison register obtains the initial driving signal and generates a detection driving signal according to the true random number modulation signal; The fault detection process includes the driver IC fault detection process, True random number generator generates true random numbers, The signal processor of the micro control center obtains the true random number and arbitrarily classifies the true random number into three parts, and maps the three parts of the true random number to the three-color signal of R, G, and B. The signal processor uses the mapped three-color signals to generate a detection drive signal and transmits it to the driver IC of the LED display module. The detection drive signal generated by the true random number mapping is propagated to each color channel of the LED display module through the RGB drive signal generated by the driver IC of the LED display module. The RGB driving signal generated by the driving IC of the LED display module is transmitted to the micro control center for analysis. The micro control center compares the RGB driving signal with the three-color signal in the detection driving signal. If the signal data of at least one color of the three colors R, G, and B in the RGB driving signal is consistent with the signal data of the three colors R, G, and B in the three-color signal in the detection driving signal, and the signal data of at least one color is inconsistent with the signal data of the three colors R, G, and B in the three-color signal in the detection driving signal, the micro control center determines that the driving IC of the LED display module is faulty. The fault detection process includes the drive signal input fault detection process, True random number generator generates true random numbers, The signal processor of the micro control center obtains the true random number and arbitrarily classifies the true random number into three parts, and maps the three parts of the true random number to the three-color signal of R, G, and B. The signal processor uses the mapped three-color signals to generate a detection drive signal and transmits it to the driver IC of the LED display module. The detection drive signal generated by the true random number mapping is propagated to each color channel of the LED display module through the RGB drive signal generated by the driver IC of the LED display module. The RGB driving signal generated by the driver IC of the LED display module is transmitted to the micro control center for analysis. The micro control center compares the RGB driving signal with the three-color signal in the detection driving signal. If the signal data of the three colors R, G, and B in the RGB driving signal does not match the signal data of the three colors R, G, and B in the three-color signal in the detection driving signal, the micro control center determines that there is a fault in the driving input of the LED display module.

2. A handheld LED fault detection device according to claim 1, characterized in that: The fault detection device obtains the LED display module parameter information according to the user selection content. The LED display module parameter information includes the LED display module driver IC type information and the LED display module channel number information. The fault detection device generates a fault detection signal of indefinite length according to the obtained LED display module parameter information.

3. A handheld LED fault detection device according to claim 1, characterized in that: The micro control center is connected to the bus driver, the bus driver is connected to the first hub, and the first hub is connected to the data input port of the LED display module. The micro control center is connected to the bus receiver, the bus receiver is connected to the second hub, and the second hub is connected to the data output port of the LED display module.

4. A handheld LED fault detection device according to claim 1, characterized in that: A display screen is provided for users to select fault detection contents and display fault detection results. The display screen is an OLED display screen, and an IIC interface is provided on the display screen, and the IIC interface is connected to a micro control center.

5. A handheld LED fault detection device according to claim 1, characterized in that: A plurality of buttons are provided, including a first button, a second button, a third button and a fourth button. The first button is connected to the power supply and controls whether the fault detection device is started or not. The second button and the third button are respectively the up and down adjustment buttons for selecting the content of the display screen, which are used by the user to select the detection content. The fourth button is a selection button, which is used by the user to select and confirm the detection content.

6. A handheld LED fault detection device according to claim 1, characterized in that: The fault detection process includes the LED lamp bead fault detection process, The micro control center sends LED lamp bead fault detection signals to the LED display module. The LED display module receives the LED lamp bead fault detection signal. The LED display module starts the driver IC self-test process. The control module of the LED display module sends a detection signal to the driver IC of the LED display module. The driver IC obtains the detection signal to run the lamp bead bad point detection process. The driver IC scans each LED lamp bead on the LED display module. The driver IC collects and obtains the status data of each LED lamp bead. The driver IC determines whether there is a bad point based on the built-in self-test algorithm. Once the driver IC detects a bad pixel, it will mark this information and generate a LED lamp bead fault detection result signal. The driver IC transmits the LED lamp bead fault detection result signal to the micro control center.

7. A handheld LED fault detection device according to claim 1, characterized in that: The fault detection process includes the power input fault detection process, The micro control center outputs a low-level stable driving signal to the LED display module for a certain period of time. True random number generator generates true random numbers, The signal processor of the micro control center obtains the true random number and maps the true random number to the preset driving parameter to generate the detection driving signal. The detection drive signal generated by the true random number mapping is transmitted to the driver IC of the LED display module. The driver IC obtains the content information of the detection drive signal and generates a working drive signal to control the LED lamp beads. The working drive signal is transmitted to the micro control center through the data output port and the drive signal input port. The micro control center obtains the working drive signal and compares the working drive signal with the detection drive signal to determine whether there is a deviation or abnormality between the working drive signal and the detection drive signal. If the micro-control center detects that there is a deviation or abnormality between the working drive signal and the detection drive signal, it is judged that there is a fault in the power input of the LED display module. If the micro-control center detects that the working drive signal and the detection drive signal are consistent, it is judged that the power input of the LED display module is normal.

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