Short circuit position detection method and system for data line and power line of lamp panel

Abstract

The invention relates to a short-circuit position detection method and system for a data line and a power line of a lamp panel, and the method comprises the steps: obtaining the short-circuit data of a lamp bead from the nearest end to the farthest end of a signal interface of a controller in a to-be-detected lamp panel, taking the short-circuit data as a vertical coordinate, and taking the distance from the signal interface of the controller as a horizontal coordinate, and constructing a curvilinear equation; and judging whether the lamp panel data line and power line short-circuit fault occurs on the lamp panel to be detected, if so, obtaining the short-circuit data to be detected, inputting the short-circuit data to be detected into the curvilinear equation, and obtaining the short-circuit position of the lamp panel data line and power line. The device can detect the specific adhesion position of the signal line and the power line, and facilitates the maintenance and replacement of the lamp bead with the short circuit of the signal line and the power line.

Description

Technical Field

[0001] The present invention relates to the technical field of short circuit detection, and in particular to a method and system for detecting the short circuit position of a data line and a power line of a light board. Background Art

[0002] How to connect LED lamp beads on the light board: There are usually three ways to connect LED lamp beads on the light board, namely series connection, parallel connection, and series-parallel combination. Figure 1 shown.

[0003] Usually, LED lamp beads connected in series require a higher voltage to drive. When some LED lamp beads have an open circuit failure, the following lamp beads may fail to light up. Figure 2 shown.

[0004] The parallel connection of LED lamp beads can drive multiple LED lamp beads at the same time with low voltage. When a single lamp bead fails, it will not affect other LED lamp beads. In addition, the parallel LED lamp beads require fewer solder pads. Figure 3 shown.

[0005] Each lamp bead on the light board is packaged together with a driver chip and three RGB LED lights. Therefore, on the light board PCB, each lamp bead must have at least a VDD pad and a GND pad to power the driver chip and the LED light, and an SDI pad to control the signal to the driver chip.

[0006] The distance between the lamp beads and the lamp bead package of the parallel lamp board: Because the LED lamp beads are connected in parallel, the lamp beads require fewer pads, and at least three pads are needed to meet the functional requirements. Therefore, the lamp bead package of the parallel lamp board is smaller than that of the series lamp board. When the LED lamp bead package area becomes smaller, the distance between the lamp beads can also be reduced, so more pixels can be accommodated on one lamp bead, improving the resolution of the lamp board. How to draw a PCB with small pitch and small package, such as Figure 4 ; Among them, VDD and GND are the power line and ground line, and SDI is the signal line.

[0007] Lamp bead patch: Usually there are a large number of lamp beads on a lamp board, and when the distance between the lamp beads becomes smaller, manual soldering is more difficult and less efficient. Therefore, it is necessary to solder the lamp beads to the pads of the PCB by machine patching.

[0008] The resulting problem: Due to the different processes and yields of machine patching in various factories, sometimes solder will connect the GND pad and the SDI pad. In this case, all chips on the signal line will always receive a low-level signal, such as Figure 5, or soldering the VDD pad and SDI pad together. In this case, all chips on the signal line will always receive a high-level signal, such as Figure 6 .

[0009] Once the signal line and the power line are stuck together, all chips on the signal line will not be able to receive normal signals, which will cause the light board to not work properly. Summary of the invention

[0010] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method and system for detecting the position of the short circuit between the data line and the power line of the lamp board, which can detect the specific adhesion position of the signal line and the power line, and facilitate the repair and replacement of the lamp beads with short circuit between the signal line and the power line.

[0011] To achieve the above object, the present invention provides the following solutions:

[0012] A method for detecting a short circuit position between a data line and a power line of a light board, comprising:

[0013] Obtain short-circuit data from the lamp bead closest to the controller signal interface to the farthest lamp bead in the lamp board to be tested, use the short-circuit data as the ordinate and the distance from the controller signal interface as the abscissa to construct a curve equation;

[0014] Determine whether the lamp board to be tested has a short circuit fault between the lamp board data line and the power line. When a fault occurs, obtain the short circuit data to be tested, input the short circuit data to be tested into the curve equation, and obtain the short circuit position between the lamp board data line and the power line.

[0015] Optionally, obtaining short-circuit data from the nearest end to the farthest end of the lamp bead in the lamp board to be tested from the controller signal interface includes: short-circuit data under active short-circuit VDD pad and SDI pad and short-circuit data under active short-circuit GND pad and SDI pad.

[0016] Optionally, obtaining the short-circuit position between the light board data line and the power line includes: obtaining the short-circuit position between the light board data line and the power line using a short-circuit detection device;

[0017] The short circuit detection device comprises:

[0018] Constant current drive module, used to keep the current in the circuit constant;

[0019] A differential operational amplifier module is used to obtain short-circuit data to be tested from the signal line interface and the power line interface, and amplify the short-circuit data to be tested;

[0020] The ADC module is used to convert the amplified short-circuit data into digital quantities and collect the potential difference between the signal line interface and the power line interface and the potential difference between the two ends of the sampling resistor;

[0021] The MCU module is used to determine whether the lamp board data line and the power line short-circuit fault occurs in the lamp board under test by utilizing the potential difference between the acquisition signal line interface and the power line interface, the potential difference between the two ends of the sampling resistor, and the current in the circuit. When a fault occurs, the digital quantity is input into the curve equation to obtain the short-circuit position of the lamp board data line and the power line.

[0022] Optionally, the short circuit detection device further includes:

[0023] A DC power supply module, used to provide current to the constant current drive module;

[0024] The LCD module is used to visually display the short circuit position.

[0025] Optionally, determining whether a short circuit fault occurs between a data line and a power line of the lamp board to be tested includes:

[0026] When the absolute value of the potential difference between the signal line interface and the power line interface is the same as the DC power supply electromotive force, and there is no potential difference across the sampling resistor, it proves that the lamp board under test has no short circuit fault; when the absolute value of the potential difference between the signal line interface and the power line interface is not the same as the DC power supply electromotive force, and the constant current drive module provides a stable current for the circuit, and there is a potential difference across the sampling resistor, it proves that the lamp board under test has a short circuit fault between the lamp board data line and the power line.

[0027] Optionally, the curve equation is expressed as:

[0028] Y=k*x+b

[0029] Among them, Y is the digital value of short-circuit data, x is the short-circuit position, and k and b are coefficients.

[0030] Optionally, the coefficient is expressed as:

[0031] k=(AB)÷(C-1)

[0032] b=Bk

[0033] Among them, A is the pixel data farthest from the interface, B is the pixel data closest to the interface, and C is the number of pixels.

[0034] To achieve the above object, the present invention also provides a short circuit position detection system for a data line and a power line of a light board, comprising:

[0035] The curve equation construction subsystem is used to obtain the short-circuit data of the lamp bead from the nearest end to the farthest end of the controller signal interface in the lamp board to be tested, and to construct the curve equation with the short-circuit data as the ordinate and the distance from the controller signal interface as the abscissa;

[0036] The short-circuit position detection subsystem is used to determine whether the lamp board to be tested has a short-circuit fault between the lamp board data line and the power line. When a fault occurs, the short-circuit data to be tested is obtained, and the short-circuit data to be tested is input into the curve equation to obtain the short-circuit position of the lamp board data line and the power line.

[0037] The beneficial effects of the present invention are:

[0038] For light boards with lamp beads connected in parallel, the adhesion of the signal line and the power line caused by poor lamp bead patching will not only cause the light board to fail to display normally, but may also cause a power short circuit, thereby damaging the light board or causing other economic losses. In order to troubleshoot the above problems, the present invention measures the voltage difference between the signal line interface and the power line interface, and combines the pre-designed curve equation to calculate the specific adhesion position of the signal line and the power line, thereby helping the production line to troubleshoot potential problems before the light board leaves the factory, and accurately locate the problematic lamp beads, making it convenient for the production line to repair the light board, avoiding possible damage to the light board, and improving the efficiency of troubleshooting light board failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] Figure 1 This is an example diagram of the series connection of lamp beads of the present invention;

[0041] Figure 2 This is an example diagram of the lamp beads in parallel of the present invention;

[0042] Figure 3 This is an example diagram of the soldering pads of the parallel LED lamp beads of the present invention;

[0043] Figure 4 This is an example diagram of a PCB with a small pitch and small package of the present invention;

[0044] Figure 5 A schematic diagram of connecting a GND pad and an SDI pad according to the present invention;

[0045] Figure 6 A schematic diagram of connecting a VDD pad and an SDI pad in the present invention;

[0046] Figure 7 A schematic diagram of a short circuit detection device according to an embodiment of the present invention;

[0047] Figure 8 A schematic diagram showing that a constant current driving module according to an embodiment of the present invention generates a constant current in a control loop;

[0048] Fig. 9 It is a working schematic diagram of the short circuit detection device according to an embodiment of the present invention;

[0049] Fig.10 This is a schematic diagram of removing the lamp bead farthest from the controller signal interface and actively short-circuiting the VDD pad and the SDI pad in an embodiment of the present invention;

[0050] Fig.11 This is a schematic diagram of removing the lamp bead closest to the controller signal interface and actively short-circuiting the VDD pad and the SDI pad in an embodiment of the present invention;

[0051] Fig.12 This is a schematic diagram of removing the lamp bead farthest from the controller signal interface and actively short-circuiting the GND pad and the SDI pad in an embodiment of the present invention;

[0052] Fig.13 This is a schematic diagram of removing the lamp bead closest to the controller signal interface and actively short-circuiting the GND pad and the SDI pad in an embodiment of the present invention;

[0053] Fig.14 A schematic diagram of a curve equation according to an embodiment of the present invention;

[0054] Fig.15 This is a schematic diagram of a light board in which a signal line (SDIA) is connected to 20 pixels according to an embodiment of the present invention;

[0055] Fig.16 This is a schematic diagram of removing the lamp bead closest to the controller signal interface and actively short-circuiting the GND pad and the SDI pad in an embodiment of the present invention;

[0056] Fig.17 This is a schematic diagram of removing the lamp bead farthest from the controller signal interface and actively short-circuiting the GND pad and the SDI pad in an embodiment of the present invention;

[0057] Fig.18 This is a schematic diagram of intentionally short-circuiting the GND pad and the SDIA pad of the 16th pixel of the controller signal interface in an embodiment of the present invention;

[0058] Fig.19 This is a schematic diagram of PCB wiring resistance between adjacent lamp beads according to an embodiment of the present invention;

[0059] Fig. 20A schematic diagram of a constant current generated by a constant current driving module in a short circuit detection device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] The present embodiment discloses a method for detecting the short-circuit position of a data line and a power line of a lamp board, comprising: obtaining short-circuit data from the nearest end to the controller signal interface to the farthest end of the lamp bead in the lamp board to be tested, using the short-circuit data as the vertical coordinate and the distance from the controller signal interface as the horizontal coordinate to construct a curve equation; determining whether a short-circuit fault occurs between the data line and the power line of the lamp board to be tested, and when a fault occurs, obtaining the short-circuit data to be tested, inputting the short-circuit data to be tested into the curve equation to obtain the short-circuit position of the data line and the power line of the lamp board.

[0063] Furthermore, obtaining short-circuit data from the nearest end to the farthest end of the lamp bead in the lamp board to be tested from the controller signal interface includes: short-circuit data under active short-circuit VDD pad and SDI pad and short-circuit data under active short-circuit GND pad and SDI pad.

[0064] Further, obtaining the short-circuit position of the data line and the power line of the light board includes: obtaining the short-circuit position of the data line and the power line of the light board by using a short-circuit detection device;

[0065] The short-circuit detection device includes: a constant current drive module, which is used to keep the current in the circuit unchanged; a differential operational amplifier module, which is used to obtain the short-circuit data to be tested from the signal line interface and the power line interface, and amplify the short-circuit data to be tested; an ADC module, which is used to convert the amplified short-circuit data into a digital quantity, and collect the potential difference between the signal line interface and the power line interface and the potential difference across the sampling resistor; an MCU module, which is used to use the potential difference between the signal line interface and the power line interface, the potential difference across the sampling resistor and the current in the circuit to determine whether the lamp board to be tested has a short-circuit fault between the lamp board data line and the power line. When a fault occurs, the digital quantity is input into the curve equation to obtain the short-circuit position of the lamp board data line and the power line.

[0066] The short-circuit detection device also includes: a DC power supply module, which is used to provide current to the constant current drive module; and an LCD module, which is used to visually display the short-circuit position.

[0067] Figure 7 The module diagram specifically includes: Signal line interface: signal line interface on the lamp board. Power line interface: power interface on the lamp board, i.e. VDD or GND. Constant current drive module: ensure that the current in the circuit remains unchanged no matter what kind of lamp board is connected. DC power supply module: provide current to the constant current drive module and related circuits. Differential operational amplifier module: obtain the analog quantity of short-circuit data from the signal line interface and the power line interface, and amplify the short-circuit data and output it to the ADC module. ADC module: obtain the amplified short-circuit data from the differential operational amplifier module, convert the short-circuit data into digital quantity, and output it to the MCU module. MCU module: obtain the short-circuit data that has been converted into digital quantity from the ADC module. According to the short-circuit data, calculate the specific location of the short circuit of the signal line and the power line, and output it to the LCD screen. LCD module: convert the short-circuit information into text, so that the user can understand the short-circuit information intuitively. Sampling resistor: when there is current passing through the circuit, the ADC module will collect a potential difference at both ends of the sampling resistor. At this time, the MCU can determine that there is current in the circuit; if there is no potential difference at both ends of the sampling resistor, the MCU believes that there is no current in the circuit.

[0068] Further, judging whether a short circuit fault occurs between a data line and a power line of the lamp board to be tested includes:

[0069] When the absolute value of the potential difference between the signal line interface and the power line interface is the same as the DC power supply electromotive force, and there is no potential difference across the sampling resistor, it proves that the lamp board under test has no short circuit fault; when the absolute value of the potential difference between the signal line interface and the power line interface is not the same as the DC power supply electromotive force, and because the constant current drive module provides a stable current for the circuit, there is a potential difference across the sampling resistor, it proves that the lamp board under test has a short circuit fault between the lamp board data line and the power line.

[0070] Specifically, the short circuit judgment principle:

[0071] During the process of lamp bead mounting, the solder may stick the power line pad and the signal line pad together, causing all chips connected to the signal line to fail to light up normally. Therefore, before powering on the lamp board, it is necessary to first check whether the signal line and the power line are short-circuited.

[0072] In order to calculate the specific short-circuit position, you need to prepare a completely normal light board, remove the first and last pixels of each controller signal line interface, and short-circuit the signal line and power line of the first and last pixels respectively, measure and record the data after the short-circuit. Then you can get a curve equation with the distance from the controller signal interface as the horizontal coordinate and the short-circuit data size as the vertical coordinate.

[0073] Then connect the signal line interface and power line interface of the lamp board to be tested to the short circuit detection device one by one. At this time, if the signal line and power line of the lamp board are short-circuited, the DC power supply module and the constant current drive module will generate a loop, and the constant current drive module will control the loop to generate a constant current, such as Figure 8 .

[0074] Assuming that the negative pole of the DC power supply is at zero potential, the potential difference between the signal line interface and the power line interface will be collected and amplified by the differential operational amplifier module and then output to the ADC module. The ADC module will convert the amplified analog quantity into a digital quantity and send it to the MCU. Fig. 9 .

[0075] If no short circuit occurs, then the absolute value of the potential difference between the signal line interface and the power line interface is the electromotive force of the DC power supply. Because there is no current in the loop, there is no potential difference across the sampling resistor.

[0076] If a short circuit occurs, the absolute value of the potential difference between the signal line interface and the power line interface will be inconsistent with the magnitude of the DC power supply electromotive force, because there is current in the loop and there is a potential difference across the sampling resistor.

[0077] The MCU module will determine whether the signal line and the power line are short-circuited based on the potential difference between the signal line interface and the power line interface collected by the ADC module and the potential difference across the sampling resistor. If a short circuit occurs, since the PCB trace resistance per unit distance of each light board has been fixed after leaving the factory, the constant current generated in the loop is very small and will not cause a significant change in the PCB trace temperature. Therefore, the temperature drift of the PCB trace resistance can also be ignored. Then it can be considered that the resistance of the PCB trace per unit distance is a fixed value. If the short circuit position is different, the length of the PCB trace connected to the loop will be different, resulting in different resistance of the PCB trace connected to the loop. Since the constant current drive module controls the current in the loop to remain unchanged, according to Ohm's law, the absolute value of the potential difference between the signal line interface and the power line interface can represent the length of the PCB trace connected to the loop. With the help of the data when the first and last pixels are short-circuited, the position of the current short-circuited pixel can be determined.

[0078] Furthermore, the curve equation is expressed as:

[0079] Y=k*x+b

[0080] Among them, Y is the digital value of short-circuit data, x is the short-circuit position, and k and b are coefficients.

[0081] Furthermore, the expression of the coefficient is:

[0082] k=(AB)÷(C-1)

[0083] b=Bk

[0084] Among them, A is the pixel data farthest from the interface, B is the pixel data closest to the interface, and C is the number of pixels.

[0085] Specifically: Data preparation before measuring the short circuit position:

[0086] Prepare a light board in the lab with the signal line and power line not short-circuited, and perform the following operations on each controller signal line interface of the light board:

[0087] (1) Remove the lamp bead farthest from the controller signal interface, actively short-circuit the VDD pad and the SDI pad, record the output data of the differential amplifier at this time, and then cancel the short circuit. Fig.10 .

[0088] (2) Remove the lamp bead closest to the controller signal interface, actively short-circuit the VDD pad and the SDI pad, record the output data of the differential amplifier at this time, and then cancel the short circuit. Fig.11 .

[0089] (3) Remove the lamp bead farthest from the controller signal interface, actively short-circuit the GND pad and the SDI pad, record the output data of the differential amplifier at this time, and then cancel the short circuit. Fig.12 .

[0090] (4) Remove the lamp bead closest to the controller signal interface, actively short-circuit the GND pad and the SDI pad, record the output data of the differential amplifier at this time, and then cancel the short circuit. Fig.13 .

[0091] At this time, for each controller signal line interface of the lamp board, there will be four corresponding data, namely: the data of the signal line of the lamp bead closest to the controller interface being short-circuited with VDD and GND, and the data of the signal line of the lamp bead farthest from the controller interface being short-circuited with VDD and GND.

[0092] Short circuit location calculation method:

[0093] Put the short-circuit data of the lamp bead farthest from the controller signal interface and the short-circuit data of the lamp bead closest to the controller signal interface into the coordinate axis, with the distance from the controller signal interface as the horizontal coordinate x. Assume that the horizontal coordinate x=1 of the pixel closest to the controller signal interface, the horizontal coordinate x=2 of the pixel second closest to the controller signal interface... and so on.

[0094] With the short-circuit data size as the ordinate y, we can get a curve equation, such as Fig.14 .

[0095] Substituting the short-circuit data size of a lamp bead whose signal line and power line are short-circuited into the curve equation as the ordinate value, the distance between the lamp bead and the controller signal interface can be obtained.

[0096] The coefficient k in the curve equation is calculated as follows: (pixel data farthest from the interface - pixel data closest to the interface) ÷ (number of pixels - 1) = k. The coefficient b in the curve equation is calculated as follows: pixel data closest to the interface - k = b.

[0097] Practical application example: prepare a signal line (SDIA) connected to a 20-pixel light board, such as Fig.15 .

[0098] Remove the lamp bead closest to the controller signal interface, actively short-circuit the GND pad and the SDI pad, and record the data at this time as 451. Fig.16 , at this time x=1.

[0099] Remove the lamp bead farthest from the controller signal interface, actively short-circuit the GND pad and the SDI pad, and record the data at this time is 1740. Fig.17 , at this time x = 20. (Pixel data farthest from the interface - pixel data closest to the interface) ÷ (number of pixels - 1) = k; (1740-451) ÷ (20-1) = 67.8421 = k; pixel data closest to the interface - k = b; 451-67.8421 = 383.1579 = b; therefore, the curve equation is: y = 67.8421x + 383.1579.

[0100] Deliberately short-circuit the GND pad and SDIA pad of the 16th pixel from the controller signal interface, such as Fig.18 .

[0101] The signal line SDIA interface and the power line GND interface of the light board are connected to the short circuit detection device, and the short circuit data is measured to be 1480. Then the short circuit data y=1480 is substituted into the curve equation y=67.8421x+383.1579 to obtain x=16.16757, and after rounding, it is obtained that the 16th pixel from the signal line SDIA interface has a short circuit.

[0102] Short-circuit position error: In practical applications, there must be errors in the calculation results. For example, there may be accuracy errors in the process of converting analog quantities to digital quantities, or inaccurate measurement data due to loose interfaces during measurement.

[0103] Therefore, after obtaining the calculation results, if the calculated short-circuit pixel position is found to be different after re-measurement, it may be caused by human errors such as loose interfaces leading to inaccurate measurement data, etc. These reasons need to be eliminated before measuring again.

[0104] If the calculated short-circuited pixel is replaced after repair and remeasurement shows that the position of the short-circuited pixel remains unchanged, then the real short-circuited pixel may be a pixel near the calculated result.

[0105] This embodiment also discloses a short circuit position calculation principle: Fig.19 As shown, the lamp beads on the lamp board are usually arranged at equal intervals, so the PCB trace resistance between adjacent lamp beads is basically equal. After the Nth pixel signal line and the power line are short-circuited and connected to the short-circuit detection device, the resistance value is equal to: the resistance value of the first lamp bead after the short circuit + (N-1) × the PCB trace resistance between adjacent lamp beads.

[0106] like Fig. 20 As shown, the constant current driving module in the short-circuit detection device will control which pixel has a short circuit to generate a constant current in the loop, because U=I×R; after the Nth pixel signal line and the power line are short-circuited and connected to the short-circuit detection device, the voltage generated at the signal line interface and the power interface is equal to: (the resistance value of the first lamp bead after short circuit + (N-1)×the PCB trace resistance between adjacent lamp beads)×constant current.

[0107] Then we can infer that the position N of the short-circuited pixel is equal to:

[0108]

[0109] The constant current, the PCB wiring resistance between adjacent lamp beads, and the resistance value after the first lamp bead is short-circuited are all fixed values ​​relative to the lamp board; and considering that even the same type of electronic components such as constant current driver chips in the constant current driver module have certain individual differences, in order to reduce the calculation error, the constant current is omitted when actually calculating the short-circuit position.

[0110] After eliminating the constant current, the simplified calculation formula is as follows:

[0111]

[0112]

[0113] In the formula, (the voltage generated at the interface after the first lamp bead is short-circuited) and (the voltage generated after the adjacent lamp beads are short-circuited) can be calculated through the data when the first and last pixels are short-circuited. At this time, there are only two variables left in the formula: the voltage generated at the signal line interface and the power interface, and the short-circuited pixel position; therefore, when the MCU obtains the voltage data generated at the signal line interface and the power interface, the short-circuited pixel position can be calculated.

[0114] The calculation work is handed over to the MCU module, but for the MCU, what is obtained from the ADC is the data after the voltage at the interface is amplified by the differential operational amplifier. In order to ignore individual differences and reduce calculation errors, the MCU will not reduce and restore the amplified voltage data, but directly substitute the data obtained from the ADC into the formula for calculation.

[0115] Therefore, if there is a potential difference across the sampling resistor, it means that current is generated in the loop, that is, there is a short circuit; by substituting the short circuit data into the above equation, the short circuit location can be calculated.

[0116] The present embodiment also provides a short-circuit position detection system for the data line and the power line of the lamp board, including: a curve equation construction subsystem, used to obtain the short-circuit data of the lamp bead from the nearest end to the controller signal interface to the farthest end in the lamp board to be tested, and use the short-circuit data as the vertical coordinate and the distance from the controller signal interface as the horizontal coordinate to construct a curve equation; a short-circuit position detection subsystem, used to determine whether the lamp board to be tested has a short-circuit fault between the data line and the power line of the lamp board. When a fault occurs, the short-circuit data to be tested is obtained, and the short-circuit data to be tested is input into the curve equation to obtain the short-circuit position of the data line and the power line of the lamp board.

[0117] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for detecting the short circuit position of a light board data line and a power line, characterized in that: include: Obtain short-circuit data from the lamp bead closest to the controller signal interface to the farthest lamp bead in the lamp board to be tested, use the short-circuit data as the ordinate and the distance from the controller signal interface as the abscissa to construct a curve equation; Determine whether the lamp board to be tested has a short circuit fault between the lamp board data line and the power line. When a fault occurs, obtain the short circuit data to be tested, input the short circuit data to be tested into the curve equation, and obtain the short circuit position between the lamp board data line and the power line.

2. The method for detecting the short circuit position of the data line and the power line of the light board according to claim 1, characterized in that: The short-circuit data from the nearest end to the farthest end of the lamp bead in the lamp board to be tested is obtained, including: the short-circuit data under the active short-circuit VDD pad and SDI pad and the short-circuit data under the active short-circuit GND pad and SDI pad.

3. The method for detecting the short circuit position of the data line and the power line of the light board according to claim 1, characterized in that: Obtaining the short-circuit position between the light board data line and the power line comprises: obtaining the short-circuit position between the light board data line and the power line by using a short-circuit detection device; The short circuit detection device comprises: Constant current drive module, used to keep the current in the circuit constant; A differential operational amplifier module is used to obtain short-circuit data to be tested from the signal line interface and the power line interface, and amplify the short-circuit data to be tested; The ADC module is used to convert the amplified short-circuit data into digital quantities and collect the potential difference between the signal line interface and the power line interface and the potential difference between the two ends of the sampling resistor; The MCU module is used to determine whether the lamp board data line and the power line short-circuit fault occurs in the lamp board under test by utilizing the potential difference between the acquisition signal line interface and the power line interface, the potential difference between the two ends of the sampling resistor, and the current in the circuit. When a fault occurs, the digital quantity is input into the curve equation to obtain the short-circuit position of the lamp board data line and the power line.

4. The method for detecting the short circuit position of the data line and the power line of the light board according to claim 3, characterized in that: The short circuit detection device also includes: A DC power supply module, used to provide current to the constant current drive module; The LCD module is used to visually display the short circuit position.

5. The method for detecting the short circuit position of the data line and the power line of the light board according to claim 4, characterized in that: Determining whether a short circuit fault occurs between a data line and a power line of the lamp board to be tested includes: When the absolute value of the potential difference between the signal line interface and the power line interface is the same as the DC power supply electromotive force, and there is no potential difference across the sampling resistor, it proves that the lamp board under test has no short circuit fault; when the absolute value of the potential difference between the signal line interface and the power line interface is not the same as the DC power supply electromotive force, and the constant current drive module provides a stable current for the circuit, and there is a potential difference across the sampling resistor, it proves that the lamp board under test has a short circuit fault between the lamp board data line and the power line.

6. The method for detecting the short circuit position of the data line and the power line of the light board according to claim 1, characterized in that: The curve equation is expressed as: Y=k*x+b Among them, Y is the digital value of short-circuit data, x is the short-circuit position, and k and b are coefficients.

7. The method for detecting the short circuit position of the data line and the power line of the light board according to claim 6, characterized in that: The expression of the coefficient is: k=(AB)÷(C-1) b=Bk Among them, A is the pixel data farthest from the interface, B is the pixel data closest to the interface, and C is the number of pixels.

8. A short circuit position detection system for a light board data line and a power line, characterized in that: include: The curve equation construction subsystem is used to obtain the short-circuit data of the lamp bead from the nearest end to the farthest end of the controller signal interface in the lamp board to be tested, and to construct the curve equation with the short-circuit data as the ordinate and the distance from the controller signal interface as the abscissa; The short-circuit position detection subsystem is used to determine whether the lamp board to be tested has a short-circuit fault between the lamp board data line and the power line. When a fault occurs, the short-circuit data to be tested is obtained, and the short-circuit data to be tested is input into the curve equation to obtain the short-circuit position of the lamp board data line and the power line.

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