LED lamp bead automatic maintenance method, equipment, storage medium and display screen

Abstract

The present invention provides an automatic inspection method, equipment, storage medium and display screen for LED lamp beads, by making the voltage on at least one row line a first voltage, and making the voltage on the row line where the inspected LED lamp beads are located a second voltage; and controlling the voltage difference between the first voltage and the second voltage to be a detection voltage difference, thereby judging whether there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located. The present invention forms a large current at the short-circuit point, which will cause the short-circuit point and its surrounding environment to heat up, thereby drying the water vapor and debris that cause the short circuit, turning the short circuit into a non-short circuit, and thus repairing the circuit. The present invention can construct an automatic detection and maintenance system, and the compatible screen control system can realize automatic detection and automatic repair of caterpillars, short circuits, and leakages, realize automatic maintenance, reduce the damage caused to the screen by short circuits and leakages of LED lamp beads, alleviate screen aging, and extend the use time.

Description

Technical Field

[0001] The present invention relates to the technical field of LED display screens, and in particular to an automatic maintenance method, equipment, storage medium and display screen for LED lamp beads. Background Art

[0002] LED (Light-emitting diode) displays have become the most widely used self-luminous flat-panel displays due to their many advantages such as high refresh rate, high contrast, wide viewing angle, and low power consumption. They are widely used in outdoor displays, monitoring centers, advertising / media displays, stages, and other scenarios.

[0003] When the LED lamp beads of the LED display screen leak or short circuit, it will cause abnormal conduction and lighting of the LED lamp beads in the rows and columns. This phenomenon is particularly prominent in the application of array LED display screens, and its manifestation is usually the abnormal lighting of the LED lamp beads in the same column at the short circuit point, which is called "caterpillar".

[0004] The reason for the caterpillars is that there are reverse leakage points or even short circuit points in the circuit, which form an abnormal conduction loop on a row of LEDs. For details, please refer to Figure 1 , Figure 1 The display shows part of the LED array, which is driven by high-speed scanning and refreshing. Figure 1 As an example, the array LED display screen includes a plurality of row lines 11, a plurality of column lines 12, and a plurality of LED light beads 13 arranged in an array. The anodes of the LED light beads in the same row are connected together through the row lines, and the cathodes of the LED light beads in the same column are connected together through the column lines. The row signal output circuit 14 is connected to the row line 11, and the column signal driving circuit 15 is connected to the column line 12. The row signal output circuit 14 and the column signal driving circuit 15 are used to control the brightness of the LED light beads 13. The array LED display screen can drive a large number of LED light beads with only a small number of driver chips, which is called scan drive. Scan drive means lighting up only one row at a time, and refreshing from row one to row four at a high speed, and then back to row one. At each scan refresh, the column signal corresponding to each LED light bead has a certain state. Only when both the row and the column are turned on, the LED light bead will be turned on and lit. If only the row is turned on or the column is turned on, it is impossible to form a closed loop to light up the LED light bead.

[0005] The "caterpillar" will have a great impact on the display effect of the screen, because the LED lamp beads in the lit part are abnormally conductive and always remain abnormally lit during the display process, which appears extremely abrupt in the picture.

[0006] The root cause of the "caterpillar" problem is the reverse leakage of LED lamp beads, and the main reason for the reverse leakage of LED lamp beads is that the LED lamp beads are exposed to moisture and air leakage, which causes the internal environment of the LED lamp beads to be polluted, accelerates the aging of the LED lamp beads themselves, and eventually forms a short circuit or leakage point.

[0007] There is no fundamental solution to the "caterpillar" problem at present. The only way to solve this problem is to improve the LED lamp bead packaging process and adjust the LED lamp bead driving form. However, no matter how the process is improved, it is difficult to avoid the tiny gaps after the LED lamp bead is packaged. This will cause the external water vapor to penetrate into the LED lamp bead along these gaps during use. In addition, during the cutting process of the epitaxial chip, it is difficult to avoid the cutting marks at the cross-section end, which just provides a good rising channel for water vapor, that is, the "capillary phenomenon".

[0008] On the other hand, the current means of alleviating the "caterpillar" problem is mainly to reduce the "shadow level", but this cannot fundamentally solve the "caterpillar" problem. As the display screen is used for a longer time, the number of "caterpillars" will increase and the degree will become more and more obvious. Eventually, the "caterpillars" will be distributed all over the screen, and the screen itself will lose its usability.

[0009] Therefore, how to detect the "caterpillar" problem in time during use so as to repair it in time is a problem to be solved urgently in the art. Summary of the invention

[0010] Features and advantages of the invention are set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the invention.

[0011] In order to overcome the problems of the prior art, the present invention provides an automatic maintenance method for LED lamp beads, which is applied to an array LED display screen. The method comprises:

[0012] The voltage on at least one row line is set to a first voltage, and the voltage on the row line where the inspected LED lamp bead is located is set to a second voltage;

[0013] The voltage difference between the first voltage and the second voltage is controlled to be a detection voltage difference, so as to determine whether there is a damaged LED lamp bead on the row line where the inspected LED lamp bead is located.

[0014] Preferably, the step of making the voltage on at least one row line a first voltage and making the voltage on the row line where the inspected LED lamp beads are located a second voltage includes:

[0015] Making the voltage on all row lines a first voltage;

[0016] The voltage on the row lines is replaced with a second voltage row by row.

[0017] Preferably, the controlling the voltage difference between the first voltage and the second voltage as a detection voltage difference, so as to determine whether there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located, comprises:

[0018] If there is a reverse current on the row line where the inspected LED lamp beads are located, then there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located.

[0019] Preferably, the controlling the voltage difference between the first voltage and the second voltage as a detection voltage difference, so as to determine whether there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located, comprises:

[0020] The detection voltage difference is gradually increased from 0V until the voltage across the two ends of the inspected LED lamp bead reaches 12V, and then it is detected whether there is current in this process. If so, there is a damaged LED lamp bead on the row line where the inspected LED lamp bead is located.

[0021] Preferably, the voltage difference between the first voltage and the second voltage is controlled to be a detection voltage difference, so as to determine whether there is a damaged LED lamp bead on the row line where the inspected LED lamp bead is located. If the damaged LED lamp bead exists, the method further includes:

[0022] The voltage difference between the first voltage and the second voltage is controlled to be a heating voltage difference, and the heating voltage difference is greater than the detection voltage difference.

[0023] Preferably, after controlling the voltage difference between the first voltage and the second voltage to be a heating voltage difference, the method further comprises:

[0024] Detect whether there is a reverse current on the row line where the inspected LED lamp bead is located. If so, keep the voltage difference between the first voltage and the second voltage at the heating voltage difference within a preset time.

[0025] Preferably, after controlling the voltage difference between the first voltage and the second voltage to be a heating voltage difference, the method further comprises:

[0026] The voltage difference between the first voltage and the second voltage is controlled to be a detection voltage difference, and whether a reverse current exists in the row line where the detected LED lamp bead is located is detected.

[0027] Preferably, the voltage difference between the first voltage and the second voltage is controlled to be a detection voltage difference, and after detecting whether there is a reverse current in the row line where the LED lamp bead under inspection is located, if there is a reverse current, the method further includes:

[0028] The voltage difference between the first voltage and the second voltage is controlled to be a burnout voltage difference, and the burnout voltage difference is greater than the heating voltage difference.

[0029] The present invention also provides an array LED display screen, comprising:

[0030] A voltage control module, used to make the voltage on at least one row line a first voltage, and make the voltage on the row line where the inspected LED lamp bead is located a second voltage;

[0031] A pressure difference control module, used for controlling the pressure difference between the first voltage and the second voltage to be a detection pressure difference, a heating pressure difference or a burning pressure difference;

[0032] The judging module is used to judge whether there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located.

[0033] The present invention also provides an automatic maintenance device for LED lamp beads, the device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the automatic maintenance method for LED lamp beads as described in any one of the above items.

[0034] The present invention also provides a computer-readable storage medium, on which an LED lamp bead automatic maintenance program is stored. When the LED lamp bead automatic maintenance program is executed by a processor, the steps of the LED lamp bead automatic maintenance method as described in any of the above items are implemented.

[0035] The present invention provides an automatic maintenance method, equipment, storage medium and display screen for LED lamp beads, which synchronously raise the voltage of the two levels of the LED lamp beads so that there is no potential difference at both ends of the LED lamp beads, and then lower the anode voltage of the LED lamp beads row by row, so that the LED lamp beads under test and the LED lamp beads in the same row will be subjected to reverse voltage shock. When there is no short circuit or leakage point in the LED lamp beads, due to the unidirectional conduction characteristics of the diode itself, a closed loop will not be generated to conduct current. However, when there is a reverse current in the LED lamp beads, it means that there is a short circuit point or leakage point inside the LED lamp beads under test, and the loop is turned on. At this time, since all the row signals are pulled high, the current conducted by the alternate rows will be gathered at the short circuit point, and the short circuit point will be heated up.

[0036] The present invention gradually increases the reverse voltage to heat up the short-circuit point inside the LED lamp bead for a short time, and burns out the water vapor and impurities that cause the LED lamp bead to short-circuit, thereby restoring the circuit to normal. If the LED lamp bead circuit cannot be restored to normal by a large current, the current is further increased to burn out the LED lamp bead, thereby disconnecting the point and preventing it from developing into a caterpillar circuit.

[0037] By reading the specification, ordinary technicians in this field will have a better understanding of the characteristics and contents of these technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with examples, and the advantages and implementation methods of the present invention will become more obvious. The contents shown in the accompanying drawings are only used to explain the present invention and do not constitute any limitation to the present invention in any sense. In the accompanying drawings:

[0039] Figure 1 This is a schematic diagram of the structure of the driving circuit for the arrangement of light beads in an array LED display screen.

[0040] Figure 2 The figure is a flow chart of an automatic maintenance method for LED lamp beads applied to an array-type LED display screen according to the first embodiment of the present invention.

[0041] Figure 3 The figure is a flow chart of an automatic maintenance method for LED lamp beads applied to an array-type LED display screen according to the second embodiment of the present invention.

[0042] Figure 4 The figure is a flow chart of an automatic maintenance method for LED lamp beads applied to an array-type LED display screen according to the third embodiment of the present invention.

[0043] Figure 5 The fourth embodiment of the present invention is a flowchart of an automatic maintenance method for LED lamp beads applied to an array-type LED display screen.

[0044] Figure 6 The fifth embodiment of the present invention is a flowchart of an automatic maintenance method for LED lamp beads applied to an array-type LED display screen.

[0045] Figure 7 This is a structural schematic diagram of an LED display screen with an automatic LED lamp bead maintenance function according to a sixth embodiment of the present invention.

[0046] Figure 8 The present invention is a schematic diagram of a circuit in which a short circuit and a leakage point exist in an LED display screen according to an embodiment of the present invention.

[0047] Fig. 9 This is the equivalent circuit for multiple short circuits in the same row.

[0048] Fig.10 Schematic diagram of a voltage regulation repair curve according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0051] Example 1

[0052] like Figure 2 As shown, an embodiment of the present invention provides an automatic maintenance method for LED lamp beads, which is applied to an array LED display screen. The method includes:

[0053] S11, setting the voltage on at least one row line to a first voltage, and setting the voltage on the row line where the inspected LED lamp beads are located to a second voltage;

[0054] S12, controlling the voltage difference between the first voltage and the second voltage to be a detection voltage difference, so as to determine whether there is a damaged LED lamp bead on the row line where the inspected LED lamp bead is located.

[0055] The detection voltage difference is generally not greater than 12V. In the most ideal case, according to the volt-ampere characteristic curve of the LED lamp bead, the detection voltage difference can just conduct the LED lamp bead circuit without lighting the LED lamp bead. In this way, it is possible to detect whether there is a short circuit in the current with a smaller reverse voltage.

[0056] In one embodiment of the present invention, the detection voltage difference is a certain value, such as 2V, 3V or 5V. In addition, different detection voltage differences can be set for LED lamp beads of different colors. For example, the first voltage can be the rated operating voltage of the row driver chip, which is usually 5V. The second voltage can be the ground terminal, in which case the second voltage can be regarded as 0V. In addition, the magnitude of the second voltage can also be the same as the magnitude of the blanking voltage.

[0057] In another embodiment of the present invention, the detection voltage difference is an interval value, for example, 0 to 12V, preferably 2 to 10V. When controlling the detection voltage difference, it is necessary to gradually increase the detection voltage difference from 0V or 2V until the voltage across the two ends of the LED lamp bead under test reaches 10V or 12V. Then, detect whether there is current in this process. If so, it means that there are damaged LED lamp beads on the row line where the LED lamp beads under test are located.

[0058] It can be seen that in this embodiment, when judging whether there is a damaged LED lamp bead on the row line where the inspected LED lamp bead is located, it is mainly based on whether there is a reverse current on the row line where the inspected LED lamp bead is located. If there is a reverse current, there is a damaged LED lamp bead on the row line where the inspected LED lamp bead is located. The size of the reverse current formed depends on the voltage difference between the first voltage and the second voltage, that is, the size of the detection voltage difference. The present invention does not determine the specific position of the damaged LED lamp bead, but only needs to determine the row line where it is located to perform the next step of repair action.

[0059] The present invention uses the second voltage of the row line where the LED lamp bead under test is located and the first voltage of other row lines to form a reverse voltage difference, and uses the voltage difference between the two voltages to detect whether there is current in the circuit, and thus completes the circuit detection. The other row lines are preferably the row lines adjacent to the row line where the LED lamp bead under test is located, for example, the row line before the row line where the LED lamp bead under test is located.

[0060] When there is no short circuit or leakage point in the LED lamp bead, due to the unidirectional conduction characteristics of the diode itself, the detection voltage difference will not cause a closed loop to be generated in the row of the LED lamp bead under test, and generate current. However, when there is a reverse current in the LED lamp bead, it means that there is a short circuit point or leakage point inside the LED lamp bead under test, and the circuit is turned on. The closed loop only works on the LED lamp beads in the same column as the short circuit point, and has nothing to do with the adjacent columns of the short circuit point. That is, the short circuit point can only gather the current of other LED lamp beads in the same column as it, and the current of other columns will not act on the current column because they cannot be turned on.

[0061] The present invention utilizes the unidirectional conduction characteristics of the LED lamp bead itself. The LED lamp bead itself is a diode, and has a certain degree of reverse voltage resistance, that is, a certain degree of reverse voltage will not cause breakdown of the LED lamp bead, so a normal LED lamp bead will not be broken down due to a certain degree of reverse voltage (the certain degree here is usually more than ten volts, and the detection voltage difference is controllable, usually within a few volts).

[0062] Take the first row where the LED lamp beads under inspection are located as an example. From the moment the first row is switched to the second voltage, the other LED lamp beads in the same column as the first row of LED lamp beads will not receive reverse pressure, but only the first row of LED lamp beads will receive reverse pressure. Specifically, the voltage of the current row is lower than that of other rows. Because the other rows are all in a high state, there is no voltage difference between them, but the other rows are higher than the first row, so the voltage of other rows will form a voltage difference with the current row voltage. At the same time, because the connection between each LED lamp bead and other rows is connected together from the column line of the LED lamp bead cathode, the reverse pressure comes from the column line. In other words, the closed loop is conducted from the column line, but does not involve the switch of the column drive signal. The column signal switch can be turned off in advance to eliminate its interference.

[0063] In this embodiment, the voltage difference between the first voltage and the second voltage is controlled as a detection voltage difference, thereby controlling the current at the short-circuit point; the detection voltage difference can be very small, and can be used to detect whether there is a short circuit in the circuit. At the same time, the reverse pressure on other LED lamp beads during the detection process is also very small, so the effect on other LED lamp beads is very good, which is suitable for high-frequency detection applications.

[0064] Example 2

[0065] like Figure 3 As shown, an embodiment of the present invention provides an automatic maintenance method for LED lamp beads, which is applied to an array LED display screen. The method includes:

[0066] S21, making the voltage on all row lines the first voltage; replacing the voltage on the row lines with the second voltage row by row.

[0067] S22, controlling the voltage difference between the first voltage and the second voltage to be a detection voltage difference, so as to determine whether there is a damaged LED lamp bead on the row line where the inspected LED lamp bead is located.

[0068] Different from the first embodiment, the present embodiment firstly raises the voltage on all row lines to the first voltage, and at the same time turns off the column driving circuit. At this time, the voltages of the two levels of the LED lamp beads are raised synchronously, and there is no potential difference between the two ends of the LED lamp beads. Then, the first voltage on the row lines is replaced with the second voltage row by row, and each replacement ensures that only one row line has the second voltage, and each replacement is completed with the second voltage, and step S22 needs to be executed. In the specific implementation, a tested LED lamp bead can be randomly specified on each row line.

[0069] In this embodiment, when the voltage on the nth row line is replaced with the second voltage, the voltages on all other row lines are the first voltage. At this time, since the signals of all row lines are pulled high, the currents conducted by each row will be gathered at the short-circuit point.

[0070] In this embodiment, the first voltage on the row line is replaced by the second voltage, and only one row is tested at a time. After the test is completed, the row line is pulled up to the first voltage again. If the row line generates current at the second voltage, it means that there is a short circuit point or leakage point inside the current row. In this way, the test of the LED lamp beads of the entire panel is completed.

[0071] In the process of conducting the reverse circuit, the other lamp beads on the same column are in series with the current lamp bead. Except for the leakage lamp, all the lamp beads are connected together and in series with the leakage lamp. The current of the two is equal, which is equivalent to the other lamp beads in this column providing energy for the short-circuited lamp bead. The energy is transmitted through all other lamp beads, reducing the circuit load.

[0072] Example 3

[0073] On the basis of the above-mentioned embodiment 1 or embodiment 2, if it is determined that there is a damaged resistor on the row line where the inspected LED lamp bead is located, then there is a reverse current on the row line where the inspected LED lamp bead is located, and the damaged resistor needs to be repaired, such as Figure 4 As shown, the steps include:

[0074] S31, determining that there are damaged LED lamp beads in the row where the inspected LED lamp beads are located;

[0075] S32, controlling the voltage difference between the first voltage and the second voltage to be a heating voltage difference.

[0076] At this time, the voltage on at least one row line is the first voltage, and the voltage on the row line where the LED lamp bead under test is located is the second voltage. The heating voltage difference is greater than the detection voltage difference. Although the damaged LED lamp bead is not necessarily the LED lamp bead under test, the damaged lamp bead and the LED lamp bead under test are connected to the same row line. Therefore, when the voltage on the row line where the LED lamp bead under test is located is the second voltage, and the voltage difference between the first voltage and the second voltage is the heating voltage difference, the voltage difference across the damaged lamp bead is the heating voltage difference.

[0077] In this embodiment, the voltage difference between the second voltage and the first voltage is enlarged. At this time, the first voltage can be increased, the second voltage can be reduced, or both the first voltage and the second voltage can be increased. At this time, the reverse current on the row where the LED lamp bead under inspection is located increases. In specific implementation, the voltage difference of the LED lamp bead under inspection can be gradually increased from the detection voltage difference to the heating voltage difference. In this embodiment, the heating voltage difference is greater than or equal to 5V and less than 12V.

[0078] This embodiment utilizes the heat generated by a large current at a short-circuit point to change the electrical environment of the short-circuit point, thereby repairing the damaged LED lamp bead.

[0079] Example 4

[0080] On the basis of the above-mentioned embodiment 1 or embodiment 2, if it is determined that there is a damaged resistor on the row line where the inspected LED lamp bead is located, then there is a reverse current on the row line where the inspected LED lamp bead is located, and the damaged resistor needs to be repaired, such as Figure 5 As shown, the steps include:

[0081] S41, determining that there are damaged LED lamp beads in the row where the inspected LED lamp beads are located;

[0082] S42, controlling the voltage difference between the first voltage and the second voltage to be a heating voltage difference.

[0083] At this time, the voltage on at least one row line is the first voltage, and the voltage on the row line where the inspected LED lamp beads are located is the second voltage.

[0084] S43, detecting whether there is a reverse current on the row line where the inspected LED lamp beads are located, and if so, maintaining the voltage difference between the first voltage and the second voltage at the heating voltage difference within a preset time.

[0085] Different from the previous embodiment, in this embodiment, when there is still reverse current using the heating pressure difference, the heating pressure difference is maintained for a preset duration. The preset duration can be set according to the selected LED lamp beads. In this embodiment, the time for applying the heating pressure difference is extended to ensure that the heating time of the large current at the short-circuit point can be used to evaporate the water vapor inside the lamp bead.

[0086] In specific implementation, the heating voltage difference may not be a specific value, but a range, such as 8 to 11V. That is to say, taking the first voltage as 5V, even if the voltage of the row line where the inspected LED lamp beads are located, that is, the second voltage has dropped to -3V, but there is still a reverse current in step S43, then the voltage of the row line where the inspected LED lamp beads are located can be further reduced to -5V or -6V.

[0087] Example 5

[0088] On the basis of the above-mentioned embodiment 3 or embodiment 4, after step S32 or step S43, the following steps are further included:

[0089] S51, controlling the voltage difference between the first voltage and the second voltage to be a detection voltage difference;

[0090] S52, detecting whether there is a reverse current in the row line where the LED lamp bead under inspection is located, if yes, proceeding to step S53; if no, proceeding to step S56;

[0091] S53, controlling the voltage difference between the first voltage and the second voltage to be a burnout voltage difference;

[0092] S54, controlling the voltage difference between the first voltage and the second voltage to be a detection voltage difference;

[0093] S55, detecting whether there is a reverse current in the row line where the LED lamp bead under inspection is located, if yes, returning to step S53; if no, proceeding to step S56;

[0094] S56. Repair completed.

[0095] The burnout voltage difference is greater than the heating voltage difference. Generally, the burnout voltage difference is less than 13V, for example, 12V.

[0096] The typical phenomenon that causes the lamp bead to short-circuit is that the lamp bead is damp, causing the chip electrode to be contaminated by water stains and conduct. There are a series of aging mechanisms here. Simply put, during the processing of the lamp bead, including the patch process, small gaps will appear in the lamp bead package. This gap is difficult to detect with the naked eye. During the use of the screen, there is a temperature difference between the electrode on the surface of the lamp bead and the outside world. When the humidity of the external air is high, the negative pressure caused by the temperature difference will inhale water vapor into the lamp bead. In the packaging environment inside the lamp bead, the upper surface of the electrode was originally filled with inert gas, which is now replaced by water vapor. Water vapor will adhere to the cut section of the electrode and gradually turn into liquid. As the number of times the lamp bead is used increases, this trend will gradually develop into a short-circuit point that conducts the lamp bead electrode. The water stains act as an electrolyte to conduct the electrodes at both ends of the lamp bead, causing ion migration between the lamp bead electrodes, that is, electrochemical corrosion.

[0097] Based on this, the core of the repair of this application is to evaporate the water vapor inside the lamp bead. The present invention gradually increases the pressure difference and raises the reverse current to evaporate the water vapor inside the lamp bead, and can repair the lamp bead fault at a fixed point for the lamp bead that has already experienced short circuit and reverse leakage.

[0098] In this embodiment, after the damaged lamp bead is repaired by using the heating pressure difference, the pressure difference is switched back to the detection pressure difference to detect whether there is still a conduction loop. If it still does not exist, the repair is determined to be complete. If the conduction current still exists after the heating pressure difference is continued for a certain period of time, the burnout pressure difference is switched. After switching to the burnout pressure difference, the detection pressure difference is applied again to determine that the repair is complete when there is no conduction current.

[0099] In this embodiment, the repair result can be determined.

[0100] Example 6

[0101] like Figure 7 As shown, the present invention provides an array LED display screen, including a voltage control module 61 , a voltage difference control module 62 , and a judgment module 63 .

[0102] The voltage control module 61 is used to make the voltage on at least one row line a first voltage, and to make the voltage on the row line where the inspected LED lamp beads are located a second voltage.

[0103] The pressure difference control module 62 is connected to the voltage control module 61 and is used to control the pressure difference between the first voltage and the second voltage to be a detection pressure difference, a heating pressure difference or a burning pressure difference.

[0104] The judgment module 63 is connected to the voltage control module 61 and is used to judge whether there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located. More specifically, under the detection voltage difference, if there is a reverse current on the row line where the inspected LED lamp beads are located, then there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located.

[0105] In specific implementation, the voltage control module 61 is further used to make the voltage on all row lines the first voltage, and replace the voltage on the row lines with the second voltage row by row, ensuring that only the voltage on one row line is the second voltage each time.

[0106] Example 7

[0107] Based on the above embodiments, the present invention also provides an automatic maintenance device for LED lamp beads, the device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the automatic maintenance method for LED lamp beads as described in any one of the above items.

[0108] It should be noted that the above-mentioned device embodiment and method embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment, and the technical features in the method embodiment are correspondingly applicable in the device embodiment, which will not be repeated here.

[0109] Example 8

[0110] Based on the above embodiments, the present invention also provides a computer-readable storage medium, on which an LED lamp bead automatic maintenance program is stored. When the LED lamp bead automatic maintenance program is executed by a processor, the steps of the LED lamp bead automatic maintenance method as described in any of the above items are implemented.

[0111] It should be noted that the above-mentioned medium embodiment and method embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment, and the technical features in the method embodiment are correspondingly applicable in the medium embodiment, which will not be repeated here.

[0112] The present invention is further described below with reference to specific examples.

[0113] like Figure 8 As shown, it is assumed that LED bead 4 is a circuit breaker, that is, LED bead 4 is a damaged bead. LED beads 2, 6, and 8 are in the same column as LED bead 4, and will be turned on and lit when there is a row signal, forming a string of bright LED beads, namely a "caterpillar".

[0114] When performing automatic maintenance on LED lamp beads, first pull up all row signal outputs to make the voltage on all row lines the first voltage; at the same time, disconnect all column signals. At this time, the normal LED lamp beads inside the circuit do not form a conduction loop, and the damaged lamp bead 4 can be reversely conducted. However, because all rows are at a high level, no potential difference is formed for the damaged lamp bead 4, so no current is conducted.

[0115] Secondly, pull down the row signal row by row. Here, first pull down the first row line (referred to as row 1). The other rows are all high level, and the columns remain disconnected. At this time, for the LED lamp beads 1 and 2 in row 1, the voltage of their anodes is lower than the voltage of their cathodes, and the high level of the cathodes comes from other row lines. However, due to the unidirectional conduction characteristics of the LED lamp beads themselves, they can withstand a certain degree of reverse pressure. The LED lamp beads 1 and 2 in row 1 are normal LED lamp beads, so the circuit will not be turned on. For the damaged lamp bead 4, since the entire circuit is not turned on, the levels at both ends are consistent, and no reverse conduction loop will be formed.

[0116] Furthermore, the row one is pulled high again, and then the second row line (referred to as row two) is pulled low. Because the damaged lamp bead 4 belongs to row two, when row two is pulled low, for the damaged lamp bead 4, its cathode potential is higher than the anode, and the LED lamp bead is subjected to reverse voltage. Because the damaged lamp bead 4 itself has a short circuit or leakage, the reverse voltage will be conducted from the damaged lamp bead 4 at this time. The situation at this time is that for the LED lamp beads 2, 6, and 8 in the same column as the damaged lamp bead 4, the LED lamp bead anode is high level (row line is pulled high), and the cathode is low level (discharged from the LED lamp bead 4 is pulled low), so the LED lamp beads 2, 6, and 8 are equivalent to parallel circuits, and the damaged lamp bead 4 is conducted and powered at the same time. At this time, if the voltage drop across the two ends of the LED lamp beads 2, 6, and 8 is greater than the lighting voltage drop of the LED lamp beads themselves, the LED lamp beads 2, 6, and 8 will still be lit.

[0117] For LED lamp beads 1, 5, and 7 in different columns and rows from the damaged lamp bead 4, their cathodes are not pulled down by the damaged lamp bead 4. Although the anode is pulled up at this time, it does not conduct the circuit, so it is still affected by the forward voltage and does not work here. For LED lamp bead 3 in the same row as the damaged lamp bead 4, its anode is pulled down (row 2) and the cathode is pulled up, and the LED lamp bead is subjected to reverse voltage.

[0118] Since a reverse conductive loop is formed in row two, the system can determine that there is a short circuit point in row two. At this time, it is not necessary to specify which LED lamp bead is short-circuited. It is only necessary to gradually increase the potential difference between row two and other rows, and the current of the entire conductive loop will naturally increase, thereby increasing the current at the short circuit point. Alternatively, after detecting that there is a conductive loop, the second row is continuously pulled down for a period of time, so that the current can cause heat at the short circuit point, thereby burning the moisture at the short circuit point. At the moment of burning dry, the conductive loop in the circuit becomes an open circuit, the entire circuit is disconnected, and then the entire loop is disconnected. The damaged lamp bead 4 changes from the conductive state to the disconnected state, and the LED lamp bead 3 and the damaged lamp bead 4 are both subjected to reverse pressure.

[0119] At this time, because the short-circuit point has been burned dry and turned on, in the entire circuit, the LED lamp beads 2, 6, and 8 in the same column as the short-circuit point cannot form a voltage drop. If they were turned on and lit before, they will now be extinguished. When switching to the normal display screen, there will be no caterpillars or string lights. At the same time, it is the short-circuit point that is turned on, not the LED lamp beads themselves, so the short-circuit point also plays a certain protective role for the LED lamp beads.

[0120] During the reverse voltage conduction process, the currents of LED beads 2, 6, and 8 will converge on LED bead 4, specifically, on the short-circuit point of LED bead 4. At this time, the current borne by the short-circuit point is three times that of LED beads 2, 6, and 8. If the circuit is to heat up or form a short circuit, it will start from the short-circuit point. LED beads 2, 6, and 8 themselves will not be significantly affected by detection and repair.

[0121] Switching down to the third and fourth rows, the situation is the same as in row one, so I will not go into details here.

[0122] It should be noted that: if two LED lamp beads in adjacent columns are short-circuited at this time, that is, multiple short-circuit situations occur in the same row, because the anodes of these short-circuit points are connected to the same voltage, and the cathodes are also connected to the same voltage, the short-circuited LED lamp beads are subjected to the same voltage difference in the circuit, and will not be turned on to each other, but will be turned on uniformly and discharged to the ground uniformly.

[0123] Please also refer to Fig. 9 , Fig. 9 This is an equivalent circuit for multiple short circuits in the same row. The anodes of the other LED lamp beads in the same column as the short circuit point are connected to the first voltage, and the cathodes are connected to the second voltage through the short circuit point, which is equivalent to a parallel relationship and conduction to the short circuit point at the same time. The current of these 63 LED lamp beads is equal to the current of the short circuit point, thus ensuring that a large current is formed at the short circuit point without burning out the normal LED lamp beads.

[0124] From the equivalent circuit, we can know that the easiest way to adjust the current at the short-circuit point is to increase the voltage difference at both ends of the conduction loop. The total resistance of the loop remains unchanged, and the voltage increases, and the total current increases. Of course, the short-circuit point current can be adjusted by not only increasing the voltage difference at both ends of the loop, but also reducing the total resistance of the loop or increasing the voltage drop ratio at the short-circuit point. The purpose is to increase the short-circuit point current from small to large by adjusting the circuit parameters of the loop.

[0125] For the short-circuit point, there will be a large current on it. For the LED lamp bead with a short-circuit point, the current will first flow through the short-circuit point. When the short-circuit point is not damaged, the LED lamp bead electrode will not be turned on. Therefore, the LED lamp bead electrode will not be damaged by the large current. At most, it will be affected by a certain amount of heat due to the conduction of the short-circuit point. But the moment the short-circuit point is damaged, the formed detection circuit will be disconnected, and then the LED lamp bead will be short-circuited. At this time, the large current flows from the cathode direction of the LED lamp bead. Due to the unidirectional conduction characteristics of the LED lamp bead itself, a closed loop will not be formed here, that is, at the moment the short-circuit point is repaired, there will be no reverse large current flowing inside the circuit, and the LED lamp bead corresponding to the short-circuit point will not be seriously damaged.

[0126] The LED lamp beads in the same row as the short-circuit point only bear a large reverse voltage, but because there is no short-circuit point inside the LED lamp beads, a closed loop cannot be formed, and the LED lamp beads themselves have a certain reverse withstand voltage, so there is no impact on the LED lamp beads in the same row.

[0127] For the same column of LED lamp beads in other rows, after the short-circuit point is turned on to form a closed loop, the large current is gathered through the cathode of the same column of LED lamp beads. At this time, all LED lamp beads in the same column as the short-circuit point are in a parallel relationship, that is, the large current of the sintered short-circuit point is gathered from the same column of LED lamp beads as the short-circuit point. For the short-circuit point, its current is very large, and for the LED lamp beads in the same column as the short-circuit point, which are used to gather large currents, each current flowing through them is 1 / N of the large current, and N is the number of row tubes.

[0128] The present invention gradually increases the current at the short-circuit point, thereby gradually raising the temperature of the short-circuit point to evaporate the water vapor inside the LED lamp bead that causes the LED lamp bead to short-circuit. The volt-ampere characteristic at the short-circuit point is random. This is due to different conditions that cause the short circuit, such as water stains, corrosion degree, etc., and the detection of this requires a large cost, and the results of each detection are also different. The present invention does not require precise measurement of the electrical environment of the short-circuit point. By gradually increasing the current at the short-circuit point, the temperature at the short-circuit point will gradually increase, thereby evaporating the water vapor at the short-circuit point. After the water vapor at the short-circuit point evaporates, the circuit returns to a non-short-circuited state, and no conductive loop is generated. At this time, no reverse current will flow in the circuit. Within the reverse withstand voltage range of the LED lamp bead, increasing the pressure difference will not cause the LED lamp bead to reverse conduct. Its theoretical basis is as follows: Fig.10 shown.

[0129] When a reverse voltage is applied to the short-circuit point of an LED lamp bead, the short-circuit LED lamp bead does not conduct immediately due to the uncertain volt-ampere characteristics of the short-circuit point. It can have a certain withstand voltage characteristic for the reverse conduction voltage. Maybe this withstand voltage characteristic is very small, that is, a little reverse voltage can conduct the circuit, or maybe the withstand voltage is very strong, and a sufficiently high reverse voltage is required to conduct the short-circuit point.

[0130] No matter how high the withstand voltage of the short-circuit point is, as long as it has a short circuit or leakage during the operation of the LED lamp bead, it must be able to be turned on within the working voltage difference range. Therefore, when a reverse voltage difference is applied to the short-circuit point, there must be a conduction point to turn on the entire short-circuit loop.

[0131] After the circuit is turned on, a reverse current will appear at the short-circuit point. This current will gradually increase with the increase of reverse voltage. By adjusting the reverse voltage difference (i.e., detection pressure difference, heating pressure difference, and burning pressure difference), the ideal current increase situation is as follows: Figure 7 The voltage regulation curve is shown.

[0132] As the current increases, the conduction line at the short-circuit point will gradually change due to the heat of the LED lamp beads, and the water stains at the short-circuit point will gradually evaporate due to the heat, which will tend to limit the increase in current. However, this trend has not yet offset the current increase trend caused by the increase in voltage difference.

[0133] As the current continues to increase, the effect of the evaporation of water stains at the short-circuit point on the current is just as great as the effect of the pressure difference on the current. If the pressure difference is further increased, or the current pressure difference is maintained for a while, the current increase rate at the short-circuit point will be lower than the current decrease rate, and the trend will gradually decrease.

[0134] As the water stains continue to evaporate, the point where the current is short-circuited will gradually decrease, and eventually, after a certain time point or when the pressure difference increases to a certain level, the water stains will burn out and form a short circuit, causing the entire circuit to be disconnected. At this time, no reverse conduction circuit will be formed inside the LED lamp bead, thereby repairing the LED lamp bead.

[0135] It should be specifically explained here that the voltage difference is the difference between the voltage pulled up by other rows and the voltage pulled down by the current row. Its fundamental purpose is to adjust the current size at the short-circuit point by adjusting the electrical performance of the circuit. As for the current regulation of the short-circuit point in the conducting circuit, there are two main adjustment methods. The first is to adjust the proportion of the voltage drop at the short-circuit point in the voltage drop of the entire circuit. The second is to adjust the ratio of the short-circuit point while keeping the voltage drop ratio unchanged.

[0136] Furthermore, after detecting the basic parameters of the short-circuit point, since the LED lamp beads in the same row have a higher withstand voltage, the short-circuit point can be repaired without determining the specific location of the short-circuit point. The technical indicator that can be referenced is the current size of the line loop.

[0137] The LED lamp bead automatic repair method, device, storage medium and display screen provided by the present invention increase the short-circuit point current to heat the circuit at the short-circuit point, thereby drying the water vapor that causes the LED lamp bead to short-circuit. When the water vapor on the LED lamp bead electrode is dried, it is equivalent to the circuit of the conductive reverse pressure loop being disconnected, so that the entire reverse pressure loop does not take effect here. The LED lamp bead itself has a certain reverse withstand voltage, so such repair will not have much impact on the LED lamp bead itself. Here, the circuit of the conductive electrode is burned off as the standard for the LED lamp bead to be repaired. If the LED lamp bead still has a reverse circuit after a certain period of time, that is, it is not enough to solve the short circuit and leakage problems of the LED lamp bead by drying the water, the current will be further increased, so that the short-circuit point will be disconnected due to overheating of the circuit. In this way, it is equivalent to that the point becomes a dead light. Although the point is not lit, the LED lamp bead circuit inside it does not affect the conduction of the array, and for the LED lamp beads in the same column, it will not develop into a caterpillar, so the purpose of repair can also be achieved.

[0138] In summary, the automatic maintenance method, equipment, storage medium and display screen of LED lamp beads proposed in the present invention use reverse current detection, pressure difference regulation and loop detection to realize the detection and automatic repair method of short circuit and leakage points of array LED circuits. By applying a large reverse current to the short circuit points and leakage points of the array LED lamp beads, the temperature at the short circuit point inside the LED lamp beads will quickly rise due to the conduction of the large current, and then the water vapor will evaporate. If the short circuit point cannot be burned through by the large current, the current will be further increased to burn the short circuit point, and then the point will be judged as a short circuit, which will prevent it from developing into a caterpillar and affecting other LED lamp beads. By using the method described in the present invention, an automatic detection and maintenance system can be constructed, and the compatible screen control system can realize automatic detection and automatic repair of caterpillars, short circuits, and leakage, realize automatic maintenance, reduce the damage caused to the screen by short circuits and leakage of LED lamp beads, alleviate screen aging, and extend the use time.

[0139] The preferred embodiments of the present invention are described above with reference to the accompanying drawings. A person skilled in the art may implement the present invention in a variety of variations without departing from the scope and essence of the present invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to obtain another embodiment. The above are only preferred feasible embodiments of the present invention, and do not limit the scope of rights of the present invention. Any equivalent changes made using the contents of the present specification and the accompanying drawings are included in the scope of rights of the present invention.

Claims

1. An automatic maintenance method for LED lamp beads, applied to an array LED display screen, characterized in that: The method comprises: The voltage on at least one row line is set to a first voltage, and the voltage on the row line where the inspected LED lamp bead is located is set to a second voltage; Controlling the voltage difference between the first voltage and the second voltage to be a detection voltage difference, so as to determine whether there is a damaged LED lamp bead on the row line where the inspected LED lamp bead is located; The controlling the voltage difference between the first voltage and the second voltage as the detection voltage difference, so as to determine whether there is a damaged LED lamp bead on the row line where the inspected LED lamp bead is located, comprises: If there is a reverse current on the row line where the inspected LED lamp beads are located, there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located, and the voltage difference between the first voltage and the second voltage is controlled to be the heating voltage difference; or, the detection voltage difference is gradually increased from 0V until the voltage across the two ends of the inspected LED lamp beads reaches 12V, and it is detected whether there is current in this process. If so, there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located, and the voltage difference between the first voltage and the second voltage is controlled to be the heating voltage difference, and the heating voltage difference is greater than the detection voltage difference.

2. The LED lamp bead automatic maintenance method according to claim 1, characterized in that: The method of making the voltage on at least one row line the first voltage and making the voltage on the row line where the inspected LED lamp beads are located the second voltage includes: Making the voltage on all row lines a first voltage; The voltage on the row lines is replaced with a second voltage row by row.

3. The LED lamp bead automatic maintenance method according to claim 1, characterized in that: After the voltage difference between the first voltage and the second voltage is controlled to be a heating voltage difference, the method includes: Detect whether there is a reverse current on the row line where the inspected LED lamp bead is located. If so, keep the voltage difference between the first voltage and the second voltage at the heating voltage difference within a preset time.

4. The LED lamp bead automatic maintenance method according to claim 1, characterized in that: After the voltage difference between the first voltage and the second voltage is controlled to be a heating voltage difference, the method includes: The voltage difference between the first voltage and the second voltage is controlled to be a detection voltage difference, and whether a reverse current exists in the row line where the LED lamp bead under inspection is located is detected.

5. The LED lamp bead automatic maintenance method according to claim 4, characterized in that: The voltage difference between the first voltage and the second voltage is controlled to be a detection voltage difference, and after detecting whether there is a reverse current in the row line where the LED lamp bead under inspection is located, if there is a reverse current, further comprising: The voltage difference between the first voltage and the second voltage is controlled to be a burnout voltage difference, and the burnout voltage difference is greater than the heating voltage difference.

6. An array LED display screen, characterized in that: include: A voltage control module, used to make the voltage on at least one row line a first voltage, and make the voltage on the row line where the inspected LED lamp bead is located a second voltage; a pressure difference control module, used for controlling the pressure difference between the first voltage and the second voltage to be a detection pressure difference, so as to determine whether there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located; when there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located, controlling the pressure difference between the first voltage and the second voltage to be a heating pressure difference, and the heating pressure difference is greater than the detection pressure difference; The judgment module is used to judge whether there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located, including: if there is a reverse current on the row line where the inspected LED lamp beads are located, then there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located; or, gradually increase the detection voltage difference from 0V until the voltage across the two ends of the inspected LED lamp beads reaches 12V, and detect whether there is current in this process. If so, there are damaged LED lamp beads on the row line where the inspected LED lamp beads are located.

7. An automatic maintenance device for LED lamp beads, characterized in that: The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the steps of the automatic maintenance method for LED lamp beads as described in any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores an LED lamp bead automatic maintenance program, and when the LED lamp bead automatic maintenance program is executed by the processor, the steps of the LED lamp bead automatic maintenance method according to any one of claims 1 to 5 are implemented.

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