Outdoor small-spacing LED display module driven by AM

Abstract

The invention discloses an AM-driven outdoor small-spacing LED display module, and relates to the technical field of LED screen display. The LED display module comprises a PCB (Printed Circuit Board) and a bottom shell, a plurality of groups of display areas are arranged on the front surface of the PCB, and each group of display areas is provided with a plurality of sub display areas; an LED driving group is welded on each sub display area; each LED driving group comprises one LED driving chip and four LED chips; each LED chip is provided with a serial number; positioning columns are arranged on the back surface of the PCB, and the PCB is connected with the bottom shell through the positioning columns; and the back surface of the PCB is also provided with a signal connector and a power connector. According to the LED display module, the four LED chips are controlled through one LED driving chip, the driving capacity can be effectively distributed, the LED display module is more stable under the conditions of high brightness and long-time use, the density of a driving circuit is reduced, the heat dissipation performance of a product is ensured, the adverse effect of overheating on the LED display effect is prevented, and the driving efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of LED screen display, and in particular relates to an AM-driven outdoor small-pitch LED display module. Background Art

[0002] At present, the existing LED display screen solutions for outdoor or harsh environments in the industry are to use a PCB with a PM driving circuit as the carrier, with an array of LED lamp beads mounted on one side and an integrated circuit for driving display purposes mounted on the other side. The mounted LED light board is assembled in the shell, and full protection is achieved by filling glue on the front and back sides. The luminous surface of the light board after filling glue is covered with a perforated mask, which blocks the gaps between the lamp beads to improve contrast and reduce reflections. The solution usually uses TOP-type lamp beads with high outdoor protection performance, and fills glue at the pins of the lamp beads to prevent water vapor from entering the inside of the lamp beads through the pins and causing failure.

[0003] However, when pouring glue, the weight of the display screen increases due to the weight of the glue, which increases the production and handling costs, logistics costs and installation difficulty. There are also requirements for the load-bearing capacity of some buildings. At present, the minimum size of outdoor TOP-type lamp beads is close to the limit of production and processing, and there is no possibility of further reducing the pixel pitch. Therefore, chip-type lamp beads are proposed to replace outdoor TOP-type lamp beads, which can further reduce the pixel pitch and improve the contrast.

[0004] Patent CN115762358B discloses a method for manufacturing an LED module and an LED module, comprising the following steps: material preparation: preparing a lamp board and a bottom shell with a peripheral edge; assembling: installing the lamp board on the bottom shell at a position within the peripheral edge; glue pouring: pouring glue into the lamp board so that the glue is filled between the LED chips on the lamp board; solidifying glue: solidifying the glue into solid glue; cutting: cutting off the peripheral edge and part of the solid glue within the peripheral edge together, so that the spacing between adjacent LED chips is less than 2 mm when two adjacent LED modules are spliced. However, when the pixel density is higher, the PM driving circuit density on the driving surface is higher, and the glue pouring will make the heat dissipation of the LED display screen very poor and the driving efficiency low. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems and to provide an AM driven outdoor small-pitch LED display module.

[0006] The present invention provides an AM-driven outdoor small-pitch LED display module, wherein the LED display module comprises a PCB and a bottom shell, including: The front side of the PCB is provided with multiple display areas, each display area has multiple sub-display areas; an LED driver group is welded on each sub-display area; each LED driver group includes 1 LED driver chip and 4 LED chips; each LED chip is numbered; A positioning column is provided on the back of the PCB, and the PCB is connected to the bottom shell through the positioning column; A signal connector and a power connector are also provided on the back of the PCB.

[0007] Optionally, the LED driver chip is provided with an input pin 1, an input pin 2 and an output pin, the LED chip is provided with an R pin, a G pin and a B pin, and one LED driver chip controls four LED chips.

[0008] Optionally, the LED driver groups in each display area are connected in series through LED driver chips, and each LED driver group is numbered 1, 2, 3...n according to the series connection result; For each display area, a serial data packet corresponding to the display area is obtained, and control data corresponding to all LED drive groups are numbered according to the number of each LED drive group; the serial data packet includes control data corresponding to all LED drive groups in the display area; The driver group is connected to the input pin 1 The output pin connection of The driver group is connected to the input pin 2 The output pins are connected; wherein, 2<m≤n-2; Said The driver group identifies the received serial data and intercepts the data segment numbered m to obtain the target data segment; The target data segment is parsed by a preset parsing method to obtain 4 groups of control instructions; each group of control instructions carries an LED number, and each group of control instructions is sent to the corresponding LED chip according to the LED number, so that each LED chip sends a control signal to the corresponding R pin, G pin and B pin according to the control instruction.

[0009] Optionally, each LED chip controls the LED brightness through an AM driving method.

[0010] Optionally, after parsing the target data segment by a preset parsing method to obtain four groups of control instructions, the method further includes: The driver group is connected to the output pin through Input pin 2 connection of the driver group; The driver group also connects to the output pin Driver group input pin 1 connection.

[0011] Optionally, when the LED data transmission mode is the first transmission mode, the serial data packets in the LED driver group are sequentially transmitted from Deliver to ; When the data transmission mode of the LED is the second transmission mode, the LED driver group is divided into odd string lines and even string lines according to the numbers, and the serial data packets in the LED driver group pass through the odd string lines and the even string lines respectively; the odd string lines and the even string lines are connected in parallel; the LED driver groups in the odd string lines are numbered odd numbers; and the LED driver groups in the even string lines are numbered even numbers.

[0012] Optionally, the front, side and back sides of the PCB are filled with glue, and the glue forms a U-shaped package.

[0013] Optionally, the thickness of the glue on the front side of the PCB is not less than the height of the LED chip, the thickness of the glue on the side of the PCB is less than half of the pixel pitch, and the glue on the back side of the PCB is integrally potted with the glue on the front and side surfaces.

[0014] Optionally, the bottom shell and the PCB are matched via positioning columns and connected via screws or adhesive.

[0015] Beneficial effects of the present invention: The present invention proposes an AM-driven outdoor small-pitch LED display module, the LED display module includes a PCB and a bottom shell, the front of the PCB is provided with multiple display areas, each display area has multiple sub-display areas; an LED driver group is welded on each sub-display area; each LED driver group includes 1 LED driver chip and 4 LED chips; each LED chip is numbered; a positioning column is provided on the back of the PCB, and the PCB is connected to the bottom shell through the positioning column; a signal connector and a power connector are also provided on the back of the PCB. Each LED driver group includes 1 LED driver chip and 4 LED chips, and 4 LED chips are controlled by 1 LED driver chip, which can effectively distribute the driving capacity, making the LED display module more stable under high brightness and long-term use, avoiding uneven brightness or failure caused by insufficient driving, and also reducing the density of the driving circuit, ensuring the heat dissipation performance of the product, preventing overheating from having adverse effects on the LED display effect, and improving the driving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 A schematic diagram of an outdoor small-pitch LED display module driven by AM is provided for an embodiment of the present invention; Figure 2 A schematic diagram of LED data trend is provided for an embodiment of the present invention; Figure 3 Another LED data trend diagram is provided for an embodiment of the present invention; Figure 4 A schematic diagram of an arrangement of LED display modules is provided for an embodiment of the present invention; Figure 5 An enlarged schematic diagram of A in a schematic diagram of arrangement of an LED display module is provided for an embodiment of the present invention; Figure 6 A schematic diagram of the structure of an LED display module is provided for an embodiment of the present invention; Figure 7 An enlarged schematic diagram of B in the structural schematic diagram of an LED display module is provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0018] 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. The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the present invention, the description of "first", "second", etc. is only used for descriptive purposes, and cannot be understood as indicating or implying its relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0019] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0020] The embodiment of the present invention provides an AM-driven outdoor small-pitch LED display module, the LED display module includes a PCB and a bottom shell: There are multiple display areas on the front of the PCB, and each display area has multiple sub-display areas; an LED driver group is welded on each sub-display area; each LED driver group includes 1 LED driver chip and 4 LED chips; each LED chip is numbered; There are positioning posts on the back of the PCB, and the PCB is connected to the bottom shell through the positioning posts; There are also signal connectors and power connectors on the back of the PCB.

[0021] An AM-driven outdoor small-pitch LED display module provided by an embodiment of the present invention, each LED driving group includes one LED driving chip and four LED chips. By controlling four LED chips through one LED driving chip, the driving capacity can be effectively allocated, so that the LED display module is more stable under high brightness and long-term use, avoiding uneven brightness or failure caused by insufficient driving, and also reducing the density of the driving circuit, ensuring the heat dissipation performance of the product, preventing overheating from having an adverse effect on the LED display effect, and improving the driving efficiency.

[0022] In one implementation, a plurality of display areas are provided on the front of the PCB. Figure 1 For example, Figure 1 This is a schematic diagram of an AM-driven outdoor small-pitch LED display module. Figure 1 There are three display areas, namely area A, area B and area C, wherein area A, area B and area C each contain multiple sub-areas numbered from 1 to n, and each sub-area has an LED driver group, the LED driver group includes an LED chip numbered a, an LED chip numbered b, an LED chip numbered c, an LED chip numbered d and a driver chip, wherein the driver chip is an LED driver chip, wherein the LED driver chip also includes a voltage gate bias pin for providing an appropriate gate bias for an internal switching element such as a MOSFET; the LED driver chip also includes a reference voltage pin for providing a stable voltage reference; the LED driver chip also includes a ground pin for connecting to a circuit ground wire as a common reference voltage for all signals.

[0023] In one implementation, each LED driver group includes 1 LED driver chip and 4 LED chips. This configuration can effectively allocate the driving capacity, making the LED display module more stable under high brightness and long-term use, and avoiding uneven brightness or failures caused by insufficient driving.

[0024] In one implementation, a positioning column is provided on the back of the PCB to ensure the precise docking of the PCB and the bottom shell, reduce errors during the installation process, and ensure the assembly accuracy of the product.

[0025] In one implementation, when the bottom shell is made of a heat-conducting material, the bottom shell is tightly connected to the PCB, and the heat of the PCB is dissipated through the heat-conducting insulating glue on the back.

[0026] In one implementation, each LED chip is numbered, which facilitates locating a specific LED chip during troubleshooting and improves maintenance efficiency. During data transmission, the data segment corresponding to each LED driver group can be determined by the number.

[0027] In one implementation, by Figure 1The layout and connection reduce the density of the driving circuit, ensure the heat dissipation performance of the product, prevent overheating from having adverse effects on the LED display effect, and improve the driving efficiency.

[0028] In one embodiment, the LED driver chip is provided with an input pin 1, an input pin 2 and an output pin, the LED chip is provided with an R pin, a G pin and a B pin, and one LED driver chip controls four LED chips.

[0029] In one implementation, see Figure 1 , take any LED driver group as an example, IN1 is input pin 1, IN2 is input pin 2, OUT is output pin, LED chip numbered a, LED chip numbered b, LED chip numbered c, LED chip numbered d are connected to the LED chip pad by welding or wire bonding. When the LED chip is in flip-chip form, the chip connection is welding; when the LED chip is in normal form, the chip connection is wire bonding; LED driver chip refers to an unpackaged chip core with PAD, and each LED chip has R pin, G pin and B pin to control the LED lamp.

[0030] In one implementation, the LED chip is not limited to the three colors of RGB, but may also be RGB+X, where X is another color, such as cyan, thereby expanding the color gamut of the display screen.

[0031] In one implementation, see Figure 1 , Figure 4 and Figure 5 ,in Figure 1 For display Figure 4 part of Figure 4 For example, this permutation combination Figure 5 for Figure 4 A magnified image of the middle A area, combined with Figure 5 The positional relationship between the LED lamp and the driver chip can be determined, and the lamp drive combination is determined. Each driver chip is surrounded by four LED chips, which are recorded as a, b, c and d respectively; the lamp drive combination is not limited to four-in-one, but can also be N*M, where N is the LED chip and M is the driver chip. Each driver chip controls up to 4 LED chips. The specific arrangement is designed by technicians according to the IC.

[0032] In one embodiment, the LED driving groups in each display area are connected in series through LED driving chips, and each LED driving group is numbered 1, 2, 3...n according to the series connection result; For each display area, a serial data packet corresponding to the display area is obtained, and control data corresponding to all LED drive groups are numbered according to the number of each LED drive group; the serial data packet includes control data corresponding to all LED drive groups in the display area; The driver group is connected to the input pin 1 Output pin connections of the driver group; The driver group is connected to the input pin 2 The output pins of the driving group are connected; wherein, 2<m≤n-2; Said The driver group identifies the received serial data and intercepts the data segment numbered m to obtain the target data segment; The target data segment is parsed by a preset parsing method to obtain 4 groups of control instructions; each group of control instructions carries an LED number, and each group of control instructions is sent to the corresponding LED chip according to the LED number, so that each LED chip sends a control signal to the corresponding R pin, G pin and B pin according to the control instruction.

[0033] In one implementation, data is transmitted in series, reducing the number of control signal lines required. In traditional multi-LED drive systems, separate wiring is usually required for each LED module, while the series method only requires a few data transmission lines, which makes the circuit design simpler, saves wiring and hardware resources, and is particularly suitable for large-scale LED display applications.

[0034] In one implementation, the preset parsing method is a rule or algorithm set in advance during the system design phase, which is used to parse and process target data segments in the transmitted serial data packets to extract useful control instructions, which is determined by a technician.

[0035] In one implementation, after each LED driver group identifies the data segment with its own number, it removes the data segment with its own number from the currently received serial data and then transmits it backwards. The serial data packets sent by the driver group and The serial data packets sent by the driver group are different, but they all contain The data corresponding to the driver group.

[0036] In one implementation, the transmitted serial data is a complete serial data packet, which contains all the control data required by multiple LED driver groups. These data are encoded into a continuous serial signal and allocated to the chips with corresponding numbers according to the data segment numbers. Each chip will only recognize and parse its own data segment. For example, when the serial data passes through the LED driver group numbered 1, it first enters the LED driver group numbered 1 from the input end, and then the LED driver group numbered 1 starts to receive the entire serial data stream and recognizes its own part according to the data segment number. The content of the data segment may include the brightness value of each LED group, the color value of each LED group, and the LED value of each LED group. The switching state of D, the data fragment numbered 1 may be encoded into the following format, assuming it is an RGB lamp, R1G1B1-R2G2B2-R3G3B3-R4G4B4, where each RnGnBn represents the color value of the nth group of LEDs, and then R1G1B1-R2G2B2-R3G3B3-R4G4B4 generates 4 control instructions, namely R1G1B1, R2G2B2, R3G3B3, and R4G4B4. These control instructions are numbered respectively, for example, R1G1B1 corresponds to a, R2G2B2 corresponds to b, R3G3B3 corresponds to c, and R4G4B4 corresponds to d. According to the corresponding number, the instruction will be sent to the corresponding LED lamp.

[0037] In one implementation, each LED driver group parses the serial data packet according to the number and extracts a specific data fragment. This segmented data transmission and processing can ensure accurate data delivery and effectively avoid the risk of data conflict or loss, ensuring the stability and reliability of the system.

[0038] In one implementation, each LED chip receives and parses control instructions according to its own number, which can provide precise control for different LEDs. By parsing the target data fragments, four sets of independent control instructions can be obtained. These instructions can be adjusted according to the actual needs of each LED, such as the adjustment of parameters such as brightness and color, and can flexibly control the output effect of each LED.

[0039] In one embodiment, each LED chip controls the LED brightness through AM driving.

[0040] In one embodiment, after parsing the target data segment by a preset parsing method to obtain four groups of control instructions, the method further includes: The driver group is connected to the output pin through Input pin 2 connection of the driver group; The driver group also connects to the output pin Driver group input pin 1 connection.

[0041] In one embodiment, when the LED data transmission mode is the first transmission mode, the serial data packets in the LED driver group are sequentially transmitted from Deliver to ; When the data transmission mode of the LED is the second transmission mode, the LED driver group is divided into odd string lines and even string lines according to the numbers, and the serial data packets in the LED driver group pass through the odd string lines and the even string lines respectively; the odd string lines and the even string lines are connected in parallel; the LED driver groups in the odd string lines are numbered odd numbers; and the LED driver groups in the even string lines are numbered even numbers.

[0042] In one implementation, the first transmission mode is a serial transmission mode, see Figure 2 A schematic diagram of LED data flow is provided, that is, all LED driver groups in the current display area are serially connected in sequence according to their numbers to transmit data. When the LED driver group numbered 1 recognizes the data segment numbered 1 in the serial data packet, the remaining data, i.e., the data after numbers 2, 3, etc., will enter the input pin 2 of the LED driver group numbered 2 through the output pin of the LED driver group numbered 1. After the LED driver group numbered 2 recognizes the data segment numbered 2 in the serial data packet, the remaining data, i.e., the data after numbers 3, 4, etc., will be output to the input pin 2 of the next numbered LED driver group through the output pin of the LED driver group numbered 2, and this process is repeated until all LED driver groups in the current display area recognize the corresponding control data.

[0043] In one implementation, the second transmission mode is a parallel mode, see Figure 3 Another LED data trend diagram is provided, taking n as an odd number as an example. Figure 3In order to reflect the data flow, they are drawn separately, where the upper part is the odd string line and the lower part is the even string line, that is, all the LED driver groups in the current display area are divided into two series lines according to their numbers, and the two series lines are relatively connected in parallel, wherein the LED driver groups with odd numbers form the odd string lines, that is, they are numbered 1, 3, 5, ..., n; the LED driver groups with even numbers form the even string lines, that is, they are numbered 2, 4, 6, ..., n; the odd string lines and the even string lines are connected in parallel with each other, after the LED driver group numbered 1 recognizes the data fragment numbered 1 in the serial data packet, the remaining data, that is, the data after numbers 2, 3, etc., will enter the input pin 1 of the LED driver group numbered 3 through the output pin of the LED driver group numbered 1, and after the LED driver group numbered 3 recognizes the data fragment numbered 3 in the serial data packet, the remaining data, that is, the data after numbers 2, 4, 5, etc., will enter the input pin 1 of the LED driver group numbered 3 through the output pin of the LED driver group numbered 1, and after the LED driver group numbered 3 recognizes the data fragment numbered 3 in the serial data packet, the remaining data, that is, the data after numbers 2, 4, 5, etc., will enter the input pin 1 of the LED driver group numbered 3 through the output pin of the LED driver group numbered 1. The output pin of the LED driver group with number 3 is output to the input pin 1 of the next odd-numbered LED driver group, and this process is repeated until all odd-numbered LED driver groups in the current display area recognize the corresponding control data; after the LED driver group with number 2 recognizes the data segment with number 2 in the serial data packet, the remaining data, i.e., the data after numbers 2, 3, etc., will enter the input pin 1 of the LED driver group with number 4 through the output pin of the LED driver group with number 2. After the LED driver group with number 4 recognizes the data segment with number 4 in the serial data packet, the remaining data, i.e., the data after numbers 1, 3, 5, 6, etc., will be output to the input pin 1 of the next even-numbered LED driver group through the output pin of the LED driver group with number 4, and this process is repeated until all even-numbered LED driver groups in the current display area recognize the corresponding control data.

[0044] In one implementation, the voltage drop of the LED red light is usually between 1.8-2.2V, and the voltage drop of the green and blue lights is usually between 2.4-2.8V. By supplying power through voltage division, unnecessary voltage drop loss can be reduced and heat accumulation during the voltage drop loss process can be reduced.

[0045] In one embodiment, glue is poured on the front, side and back of the PCB, and the glue forms a U-shaped package.

[0046] In one implementation, the glue can be transparent for use in situations where higher brightness is required, the glue can be matte for preventing mirror reflection problems, and the glue can be blackened or darkened to improve the contrast of the display and the consistency of the black screen.

[0047] In one implementation, see Figure 6 A structural schematic diagram of an LED display module is provided. Figure 7 for Figure 6The enlarged schematic diagram of point B in the middle includes a PCB, a housing, a sealing ring and packaging glue; the PCB is above the housing, there is packaging glue at the connection between the PCB and the housing, and there is a sealing ring below the housing.

[0048] In one implementation, any combination of a signal connector, a power connector, a signal contact point, and a power contact point is provided on the back of the PCB, which is an input port for external signals and power. The external input can be in the form of a connector or a contact point, such as a pin.

[0049] In one embodiment, the thickness of the glue on the front side of the PCB is not less than the height of the LED chip, the thickness of the glue on the side of the PCB is less than half of the pixel pitch, and the glue on the back side of the PCB is integrally potted with the glue on the front and side surfaces.

[0050] In one embodiment, the bottom shell and the PCB are matched via positioning columns and connected via screws or adhesive.

[0051] In one implementation, when the bottom shell is made of a heat-conducting material, the bottom shell is attached to the PCB, so that the heat of the PCB is dissipated through the bottom shell which is made of a heat-conducting material.

[0052] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An AM-driven outdoor small-pitch LED display module, characterized in that: The LED display module includes a PCB and a bottom shell: The front side of the PCB is provided with multiple display areas, each display area has multiple sub-display areas; an LED driver group is welded on each sub-display area; each LED driver group includes 1 LED driver chip and 4 LED chips; each LED chip is numbered; A positioning column is provided on the back of the PCB, and the PCB is connected to the bottom shell through the positioning column; A signal connector and a power connector are also provided on the back of the PCB.

2. The AM-driven outdoor small-pitch LED display module according to claim 1, characterized in that: The LED driver chip is provided with an input pin 1, an input pin 2 and an output pin, the LED chip is provided with an R pin, a G pin and a B pin, and one LED driver chip controls four LED chips.

3. The AM-driven outdoor small-pitch LED display module according to claim 2, characterized in that: The LED driver groups in each display area are connected in series through LED driver chips, and each LED driver group is numbered 1, 2, 3...n according to the series connection result; For each display area, a serial data packet corresponding to the display area is obtained, and control data corresponding to all LED drive groups are numbered according to the number of each LED drive group; the serial data packet includes control data corresponding to all LED drive groups in the display area; The driver group is connected to the input pin 1 Output pin connections of the driver group; The driver group is connected to the input pin 2 The output pins of the driving group are connected; wherein, 2<m≤n-2; Said The driver group identifies the received serial data and intercepts the data segment numbered m to obtain the target data segment; The target data segment is parsed by a preset parsing method to obtain 4 groups of control instructions; each group of control instructions carries an LED number, and each group of control instructions is sent to the corresponding LED chip according to the LED number, so that each LED chip sends a control signal to the corresponding R pin, G pin and B pin according to the control instruction.

4. The AM-driven outdoor small-pitch LED display module according to claim 3, characterized in that: Each LED chip controls the LED brightness through AM driving method.

5. The AM-driven outdoor small-pitch LED display module according to claim 3, characterized in that: After parsing the target data segment by a preset parsing method to obtain four groups of control instructions, the following further includes: The driver group is connected to the output pin The input pin 2 is connected; The driver group also connects to the output pin The input pin 1 is connected.

6. The AM-driven outdoor small-pitch LED display module according to claim 3, characterized in that: When the LED data transmission mode is the first transmission mode, the serial data packets in the LED driver group are transmitted in sequence according to the number. Deliver to ; When the data transmission mode of the LED is the second transmission mode, the LED driver group is divided into odd string lines and even string lines according to the numbers, and the serial data packets in the LED driver group pass through the odd string lines and the even string lines respectively; the odd string lines and the even string lines are connected in parallel; the LED driver groups in the odd string lines are numbered odd numbers; and the LED driver groups in the even string lines are numbered even numbers.

7. The AM-driven outdoor small-pitch LED display module according to claim 1, characterized in that: The front, side and back sides of the PCB are filled with glue, and the glue forms a U-shaped package.

8. The AM-driven outdoor small-pitch LED display module according to claim 7, characterized in that: The thickness of the glue on the front side of the PCB is not less than the height of the LED chip, the thickness of the glue on the side of the PCB is less than half of the pixel pitch, and the glue on the back side of the PCB is integrally potted with the glue on the front and side surfaces.

9. The AM-driven outdoor small-pitch LED display module according to claim 1, characterized in that: The bottom shell and the PCB are matched through positioning columns and connected by screws or adhesive.

Images