LED plug-in module and LED display screen

Abstract

The invention discloses an LED plug-in module and an LED display screen. The LED plug-in module comprises a circuit board, a longitudinal extension pin is arranged on one transverse edge of the circuit board, a longitudinal extension socket is arranged on the other transverse edge of the circuit board, a transverse extension pin is arranged on one longitudinal edge of the circuit board, and a transverse extension socket is arranged on the other longitudinal edge of the circuit board; an LED dot matrix; the output of the LED driving circuit is connected with the LED dot matrix; the receiving module is used for being connected with a data access board or an on-board controller used as an upper computer, is connected with the LED driving circuit and the corresponding expansion contact pins and expansion slots, analyzes data distributed by the upper computer to the current LED plug-in module for display, and sends the analyzed data to the LED plug-in module for display. And data distributed to other extended LED plug modules by the receiving module is sent to the corresponding extended LED plug modules through the corresponding extended pins and the extended slots. According to the LED plug-in module provided by the invention, the expansibility is relatively flexible.

Description

Technical Field

[0001] The present invention relates to an LED plug-in module and also relates to an LED display screen formed by the LED plug-in module. Background Art

[0002] LED display modules, also known as LED display modules or LED modules, have a wide range of application scenarios, covering multiple fields such as commerce, culture, government affairs, and industry. Different application scenarios have different requirements for LED display modules. In most application scenarios, LED display modules are fixed. Although in some application scenarios, LED display modules include an even number of LED display unit boards (generally referred to as LED unit boards, display units, or LED units), LED display units are often assembled through on-site wiring with additional cables or prefabricated connectors through plug-in. However, this type of assembly is mostly suitable for on-site production of large LED display screens. After assembly, an LED display screen cabinet or shell needs to be made for waterproof and dustproof packaging, and the scalability of the LED display screen is lost.

[0003] For applications requiring LED display modules, such as outdoor parking signs, relatively small outdoor billboards, signage, sports scoreboards, relatively small traffic condition indicators, relatively small bus arrival signs, and gas station signs, there are higher requirements for the configuration flexibility of LED display modules. At the same time, the LED display modules used in these applications are relatively small. In other words, current large LED dot matrix screens are often not suitable for such applications. This is especially true in applications with limited installation space, such as parking signs and small billboards. Such applications often require the size of the display to be specified based on the installation space. It is obviously unrealistic to develop a new LED display screen every time.

[0004] However, some specialized small LED displays often have poor versatility and are difficult to adapt to various applications. Summary of the Invention

[0005] An object of the present invention is to provide an LED plug-in module suitable for expansion. Another object of the present invention is to provide an LED display screen equipped with the LED plug-in module.

[0006] According to a first aspect of an embodiment of the present invention, there is provided an LED plug-in module, the basic structure of which includes: The circuit board is a rectangular circuit board, and has a longitudinal expansion pin on one horizontal side of the circuit board, a longitudinal expansion socket on the other horizontal side, a transverse expansion pin on one vertical side, and a transverse expansion socket on the other vertical side, so that the LED display can be expanded horizontally and / or vertically by plugging the expansion pin into the expansion socket; LED dot matrix, arranged on the circuit board; An LED driving circuit is provided on the circuit board, and its output is connected to the LED matrix; The receiving module is used to connect to the data access board or onboard controller used as the host computer, and to connect the LED drive circuit and the corresponding expansion pins and expansion slots, to parse the data distributed by the host computer to the current LED plug-in module for display, and to send the data distributed to other expansion LED plug-in modules via the receiving module to the corresponding expansion pins and expansion slots.

[0007] For the above-mentioned LED plug-in module, optionally, the extension pins and the extension socket are adapted with power cords, and the extended LED plug-in module obtains power through the extension pins and the extension socket.

[0008] Optionally, the extension pin and the extension socket are adapted to be a piercing type connector or a plug-in type connector.

[0009] Optionally, the receiving module includes a signal buffer; If the current LED plug-in module constitutes the driver board, the receiving module further includes a HUB75 interface module, and the signal buffer is connected to the Hub75 interface on the LED driver circuit through the HUB75 interface module; Correspondingly, the extension pin or extension socket is connected to the extension socket or extension pin of the next LED plug-in module for expansion of the LED plug-in module; If the current LED plug-in module constitutes an extended LED plug-in module, the signal buffer is connected to the LED driving circuit via an extension pin or an extension socket.

[0010] Optionally, the signal buffer is selected from SN74HC245, 74HCT245, 74LS245, SN74AHC245, 74HC595, 74HC164, MC74VHC245 or PCA9306.

[0011] Optionally, the LED dot matrix is m×n, wherein m and n are both integer multiples s of 8, and 1≤s≤3.

[0012] Optionally, the onboard controller is provided on a circuit board, and the circuit board constitutes a control board; The host computer is provided with a data access module, which is one or more of an RS485 interface module, an Ethernet interface module, a 4G / 5G interface module, a WiFi interface module, and a Bluetooth interface module.

[0013] Optionally, the circuit board also carries a latch chip and 38 decoding units; Wherein, 38 decoding units are integrated on the LED driving circuit; The receiving module forwards the data distributed by the host computer to other LED plug-in modules to the corresponding LED plug-in modules through the 38 decoding unit; The latch chip is used to refresh the current LED plug-in module and other LED plug-in modules simultaneously through the global clock and latch signal of the host computer.

[0014] Optionally, the receiving module includes a signal buffer, which is connected to the LED driving circuit via a HUB75 interface module.

[0015] Optionally, a protection plate is installed on the back and / or front of the circuit board to physically protect the components on the back of the circuit board; If the protection plate is arranged on the front side of the circuit board, the protection plate has holes for exposing the LED lamp beads.

[0016] Optionally, the protection plate is a grid plate or a porous plate; The protection board and the circuit board are connected by screws or rivets.

[0017] According to a second aspect of the embodiments of the present invention, there is provided an LED display screen, comprising the LED plug-in module according to the first aspect of the embodiments of the present invention.

[0018] In an embodiment of the present invention, the circuit board of the provided LED plug-in module is a rectangular board, and the four sides of the rectangular board are divided into two groups, one of which is a group that is on the longitudinal side in the installed state and is provided with a transverse extension plug-in component, and the other group is a group that is on the transverse side in the installed state and is provided with a longitudinal extension plug-in component. Each group of extension plug-in components includes an extension socket and a corresponding extension pin, so that the plug-in can be completed conveniently in terms of mechanical connection. All LED plug-in modules can have a common host computer, such as an independent data access board, or one of the LED plug-in modules can be reused as a data access board, and the other LED plug-in modules are directly or indirectly connected to the LED plug-in module through the extension plug-in component, or the LED plug-in module is directly or indirectly connected to the data access board to realize data distribution of the host computer. Currently, technologies such as hot-plug support are very mature. When a new LED plug-in module is plugged in, its logical address can be reported or assigned by the host computer. There is no need to develop new drivers or hardware configurations. It can adapt to the layout of LED displays of corresponding sizes on site, and the overall expansion convenience is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of an LED display screen with four LED plug-in modules in one embodiment.

[0020] Figure 2 Schematic diagram of the back structure of the LED plug-in module in one embodiment.

[0021] Figure 3 Schematic diagram of the connection structure between the circuit board and the grid plate in one embodiment.

[0022] Figure 4 This is an electrical schematic diagram of an LED plug-in module in one embodiment.

[0023] In the figure: 1. Vertical expansion socket, 2. Horizontal expansion pin, 3. Display unit board, 4. Vertical expansion component, 5. Horizontal expansion component, 6. Vertical expansion pin, 7. Horizontal expansion socket, 8. Rivet, 9. Rivet hole, 10. Lamp bead fixing hole, 11. Grille, 12. Circuit board.

[0024] 111. Transverse reinforcement, 112. Longitudinal reinforcement. DETAILED DESCRIPTION

[0025] In order to make the purpose of the present invention, the technical solutions for achieving the purpose of the present invention, and the advantages thereof more clearly understood, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be understood that the means and the like described in the embodiments of the present invention are merely partial technical implementations of the corresponding technical problems and are not intended to limit the present invention.

[0026] It should be noted that Figure 1 The illustrated scheme shows an LED display screen with four LED plug-in modules, and the assembled LED display screen is a regular rectangular display screen. However, based on the concept of the present invention, the formed LED display screen is not limited to a regular rectangular display screen. For example, an LED display screen can have three LED plug-in modules in the bottom row and only one LED plug-in module in the top row. The LED display screen with one LED plug-in module in the top row can be plugged into any LED plug-in module in the three LED plug-in modules in the bottom row, thereby forming a special-shaped LED display screen. From this aspect, the LED plug-in modules based on the embodiment of the present invention have good expansion flexibility.

[0027] Furthermore, if the final LED display screen is an LED display screen formed by multiple rows and columns of LED plug-in modules, each LED plug-in module is connected to at least two LED plug-in modules, and the overall structural reliability is relatively good.

[0028] It should be noted that the displayed content can be displayed in split screens or as a whole, reflecting the flexibility and interest of the displayed content. It should be noted that LED displays are generally capable of scrolling. Therefore, for current LED plug-in modules, if the number of characters entered exceeds the capacity of a single LED display, all characters will be displayed in a scrolling manner.

[0029] The LED plug-in module based on the embodiment of the present invention is suitable for relatively small LED display screens, such as temporary arrangements in squares, where quick arrangement or storage is the main purpose, and can also be applied to non-standard screens and customized screen scenarios.

[0030] Refer to the instruction manual Figure 1 , the figure shows an LED display screen assembled from four LED plug-in modules. The LED plug-in modules are represented as display unit boards 3 in the figure, and other components of the LED display screen are not shown.

[0031] As can be seen from the figure, the display unit board 3, or in other words, the circuit board 12 of the LED plug-in module, is a rectangular board. In the figure, longitudinal expansion pins 6 are located on the upper horizontal edge of the circuit board 12, while a longitudinal expansion socket 1 is located on the lower horizontal edge. Transverse expansion pins 2 are located on the left vertical edge, and a corresponding transverse expansion socket 7 is located on the right vertical edge. The positions of the expansion pins and expansion sockets on the circuit board 12 are clearly interchangeable; all LED plug-in modules require the same arrangement.

[0032] Accordingly, for the convenience of description, the plug-in assembly formed by connecting the horizontal expansion socket 7 and the horizontal expansion pin 2 is called the horizontal expansion assembly 5, and the plug-in assembly formed by connecting the vertical expansion socket 1 and the vertical expansion pin 6 is called the vertical expansion assembly 4.

[0033] Since the transmission of data signals of LED display screens often requires the transmission of 8-bit, 16-bit or more bits of data, for example, the number of pins of the longitudinal expansion pin 6 is usually not less than 20, and the pin pitch is 2.54mm, such as a 20-pin header connector, which has a certain mechanical connection strength. In other words, even if there are no other mechanical connection parts, relying solely on, for example, the longitudinal expansion component 4 and the horizontal expansion component 5 can make the assembled LED display screen structure relatively reliable.

[0034] As mentioned above, the LED plug-in module based on the embodiment of the present invention is mainly suitable for relatively small LED display screens. For example, the number of LED lamp beads in the LED dot matrix on each LED plug-in module is 8×8, 8×16, 8×24, 16×8, 16×16, and 16×32, all of which are small-sized LED plug-in modules. The circuit board itself is relatively light in weight, and a reliable connection can be achieved simply by relying on, for example, a header connector.

[0035] In addition, Figure 1In the illustrated structure, for example, the longitudinal extension pins 6 have two groups of pins on the upper edge of an LED plug-in module, one group of pins can be used as extended power pins, and the other group of pins can be used as a communication interface. There is a given span between the two groups of pins. Under this condition, the overall connection strength can be further improved to meet the connection strength between small-sized LED plug-in modules, thereby meeting the reliable assembly of the product without providing other special mechanical connection structures.

[0036] In addition, for example, extended power pins can be integrated into, for example, a header connector, that is, a longitudinal extension pin 6 can be reused between power modules of different LED plug-in modules, or some pins contained in a pin socket such as a longitudinal extension pin 6 can be used for connection between power modules, and some pins are used for communication.

[0037] The above content shows that since it is used for small-sized LED plug-in modules, the corresponding plug-in components of each LED plug-in module are equipped with a power input / output interface, and there is no need to provide an additional power interface. That is, the expanded LED plug-in module only needs to be plugged into the currently assembled LED plug-in module, and there is no need to connect an additional power cord, making assembly convenient.

[0038] In addition, if a separate extended power connector assembly is included, only a transition circuit is required on the current display unit board. Although some power will be lost due to the connection between multiple boards (mainly line loss), because it is suitable for small-sized LED plug-in modules, compared with providing cables for each LED plug-in module separately, the lost power has little effect on the driving of the LED lamp beads.

[0039] Even if the extended power pins and the communication module pins are integrated into an extended connector assembly, the power cable can be routed independently on the circuit board 12, and the overall power loss is still mainly line loss.

[0040] The power module is primarily located on the driver board (data access board) or on a specific LED plug-in module that serves as the main board. The power module can utilize a constant current IC, such as the TPS5430, which drives each LED plug-in module in parallel through the configuration of connector pins and sockets.

[0041] The aforementioned configuration of separately configuring power extension pins / sockets is equivalent to using distributed power supply, which can avoid long-distance voltage drop, but requires a spare power plug with the maximum expansion number as a second choice.

[0042] In addition, it is required that, for example, the longitudinal positions of the horizontal expansion socket 7 and the horizontal expansion pin 2 on the same circuit board 12 correspond to each other, so that the corresponding board edges of the circuit boards 12 of adjacent LED plug-in modules are flush in the assembled state.

[0043] Based on the above description, it can be seen that the LED plug-in module is used as the expansion unit, and plug-in assembly can be carried out on site. The number of LED plug-in modules can be determined according to the on-site conditions, and the data access board side usually has an adaptive function, that is, the output information on the LED display screen can be determined according to the size of the assembled LED display screen. This is common sense and will not be repeated here.

[0044] Expansion can be done vertically or horizontally, making it easy to expand on-site. This plug-in expansion method does not require on-site personnel to have corresponding professional knowledge and is relatively adaptable.

[0045] Generally speaking, LED displays often require a housing or enclosure to protect the circuit board 12. For example, the housing typically utilizes a die-cast aluminum housing to provide support and protection. In the embodiments of the present invention, LED displays are primarily suitable for small-scale applications. Furthermore, considering rapid expansion, providing a housing or enclosure for the assembled LED display is impractical. Providing a housing or enclosure for each LED plug-in module would also affect the configuration of the plug-in components. Therefore, in the preferred embodiment of the present invention, a simple protection measure for the circuit board 12 is employed.

[0046] See also Figure 2 In the structure shown in the figure, a grille 11 is fixed on the back of the circuit board 12 (the side with the lamp beads is the front, and the side opposite to the front is the back). The grille 11 is composed of crisscross ribs in the figure, and can also be understood as a grid plate.

[0047] The circuit board 12 is fixed to the grille 11 by means of riveting or screw connection, for example. The grille 11 can improve the strength of the LED plug-in module and effectively protect the circuit board 12 at the same time.

[0048] In addition, the grille 11 has a grid, which is conducive to the heat dissipation of the circuit board. In addition, the grille 11 can be, for example, black, which is more clearly contrasted with the LED lamp beads, and people look less likely to be dazzled.

[0049] Therefore, in some embodiments, a grille 11 may be disposed on the front surface of the circuit board 12 to protect the LED lamp beads while also forming a grille-shaped background for the display screen.

[0050] exist Figure 2In the illustrated structure, the grids correspond one-to-one with the LED lamp bead fixing holes 10 , which can effectively dissipate heat while providing a relatively dense shielding structure.

[0051] There are at least four fixing points between the grid 11 and the circuit board 12 to ensure that the circuit board 11 and the grid 11 are fixed securely.

[0052] The grille 11 is preferably a plastic grille, but a metal mesh can be used. Whether it is a plastic grille or a metal mesh, its main function is to protect the components on the back of the circuit board 12, as well as the printed circuit board. Another function is to dissipate heat through the grid or mesh.

[0053] Since insulation needs to be considered in some applications, the grid 11 is preferably a plastic grid.

[0054] The protective plates such as the grille 11 can be cut according to the size of the circuit board 12 and can be designed to avoid gaps according to the position of the extended connector assembly.

[0055] Based on the above design for protecting the circuit board 12, the circuit board 12 can still be protected while meeting the condition of rapid expansion, and there is basically no interference between them.

[0056] In addition, by using configurations such as the grille 11, the added weight is relatively small, and for the assembly formed by the plug-in, that is, the LED display screen, the overall load increase is relatively small, so that the mechanical connection formed by the plug-in extension itself can still be satisfied.

[0057] It should be noted that in the embodiments of the present invention, the use of protective plates such as the grille 11 is intended to provide only simple protection without considering the overall packaging of the LED display or the overall packaging of the LED plug-in module. Under this condition, while the grille 11 provides protection for the circuit board 12, its own structure is also beneficial to the heat dissipation of the circuit board, so there is no need to provide special forced cooling components such as fans.

[0058] Regarding the distribution of the LED lamp beads on the circuit board 12, there is no difference due to the design for easy expansion in the embodiment of the present invention. The LED lamp beads still form an LED dot matrix in the form of a row and column matrix.

[0059] The distribution form of the LED dot matrix on the circuit board 12 belongs to the prior art and has nothing to do with the content improved by the present invention, so it will not be described in detail here.

[0060] Each LED plug-in module is equipped with an LED driver circuit, primarily consisting of row and column driver ICs. This circuit is also inherent to the LED module. For example, the TM5020A column driver IC is a commonly used LED / lighting driver. Its built-in CMOS shift register and latch function convert serial input data into a parallel output format. The TM5020A features 16 current sources, providing a constant current of 3 to 36 mA per output port to drive the LEDs. Each OUT driver channel can be shorted for higher current output, and environmental fluctuations minimize the impact on output current. Furthermore, the current level at each TM5020A output port can be adjusted using external resistors of varying resistance (REXT). This allows precise control of LED brightness, making it suitable for high-quality white-balanced display driver modules.

[0061] The basic parameters of TM5020A are: 16 constant current source output channels; The OUT port voltage resistance can be guaranteed to be 11V; Constant current range: 3~36mA@VDD=5V; 3~20mA@VDD=3.3V; Extremely precise current output value, (channel to channel) maximum error: ≤ ± 2.0%, (chip to chip) maximum error: ≤ ± 3.0%; By adjusting the external resistor, the current output value of 16 OUTs can be precisely set; Output current fast response: minimum pulse width = 35 nS; Up to 25MHz data rate; High has the input characteristics of a Schmitt trigger; Working voltage: 3.3V~5V; Package: SSOP24-0.635 (QSOP24).

[0062] For example, the row driver IC model SM5363 is a product of Shenzhen Mingwei Electronics Co., Ltd. and is also a commonly used LED / lighting driver. Such commonly used LED / lighting drivers are all commonly used ICs in this field and are not related to the content improved in the embodiments of the present invention, so they will not be repeated here.

[0063] In addition, the LED driver circuit of the LED matrix is obviously not limited to Figure 4 The example driver IC, etc., currently LED display screens have a wide range of applications, and there are many LED driver IC manufacturers. Figure 4 The illustrated power supply schematic diagram is illustrative and not limiting.

[0064] Figure 4 The device model SN74HC245DW (Texas Instruments) is an octal bus receiver used to connect to an external data access board or an onboard controller on the same circuit board.

[0065] The SN74HC245DW features a wide operating voltage range of 2V to 6V and high-current three-state outputs, allowing it to directly drive a bus or up to 15 LSTTL loads. It also offers relatively low power consumption and a ±6mA output drive (at 5V). Bus transceivers, including the SN74HC245DW, are designed for asynchronous bidirectional communication between data buses. This control function minimizes external timing requirements. In the embodiments of the present invention, the SN74HC245DW primarily serves as a bus control device, facilitating connection to a host computer and enabling quick insertion of LED plug-in modules.

[0066] in addition, Figure 4 The pinout of the SN74HC245 in Figure 1 is defined as its canonical pinout; for example, depending on the logic level on the direction control (DIR) input, the device sends data from the A bus to the B bus, or vice versa. The output enable (OE) input can be used to disable the device, effectively isolating the bus.

[0067] This type of bus transceiver is designed for asynchronous, bidirectional communication between data buses. This control functionality minimizes external timing requirements. Current LED plug-in modules connect to other LED plug-in modules via, for example, expansion sockets or pins. The bus receivers on these other LED plug-in modules connect to corresponding expansion pins or sockets to forward data from these other LED plug-in modules for display.

[0068] The data access board or onboard controller is connected to the input device through the data access module. The data input device is, for example, a mobile phone, a PC, etc. The corresponding data access module can be, for example, a WiFi module, a 4G / 5G module, etc.

[0069] Another Figure 4 As can be seen from the illustrated structure, the SN74HC245 used as an access module is also used for data forwarding. While connecting to the LED driving circuit on the current board, it is also connected to the corresponding expansion pins and expansion slots on the board, so as to forward data to other LED plug-in modules plugged into the current LED plug-in module and provide power.

[0070] Furthermore, SN74HC245 parses the data distributed by the host computer to the current LED plug-in module for display, and sends the data distributed to other expansion LED plug-in modules plugged into the board through the receiving module to the corresponding expansion pins and expansion slots.

[0071] The aforementioned horn socket is a piercing connector (also called a piercing connector or insertion connector, i.e., a cut-in joint), a connector used to transmit electrical signals in a circuit. It consists of two parts: a skeleton made of an insulator and a metal conductor mounted on the skeleton. There are many types of piercing connectors, which are divided into single-pole and double-pole types according to their structure. According to their use, they can be divided into power connectors, communication connectors, and switch connectors. In the embodiments of the present invention, the piercing connector used is a communication connector, and it can also be a connector that combines a communication connector and a power connector.

[0072] The puncture type connector has high connection strength, but the terminals cannot be reused after being punctured. In view of the fact that in the embodiment of the present invention, the expansion plug assembly for plugging should meet the needs of frequent plugging, it is preferred to adopt a plug-in type connector.

[0073] For example, conventional RJ45 connectors, RJ11 / RJ11 connectors, USB connectors, HDMI connectors, DP connectors, MPO / MTP fiber optic connectors, DB connectors, M12 connectors, etc. belong to this type of connectors. Figure 4 In the illustrated structure, the connector used for expansion plug-in is a header with a package size of 321016MG0CBK00A03.

[0074] In addition, for SN74HC245, it can also be configured as a signal buffer for storing relevant data; accordingly, if the current LED plug-in module constitutes a driver board, the receiving module also includes a HUB75 interface module, and the signal buffer is connected to the LED driver circuit through the HUB75 interface module for appropriate current limiting.

[0075] Furthermore, the extension pin or extension socket is connected to the HUB75 interface module for expansion of the LED plug-in module.

[0076] If the current LED plug-in module constitutes an extended LED plug-in module, the signal buffer is connected to the LED drive circuit via a buffer resistor, such as Figure 4 R141 and RN10 shown in the figure.

[0077] Furthermore, the signal buffer is selected from SN74HC245, 74HCT245, 74LS245, SN74AHC245, 74HC595, 74HC164, MC74VHC245 or PCA9306.

[0078] The LED plug-in module according to claim 1, characterized in that the LED dot matrix is m×n, wherein m and n are both integer multiples s of 8, and 1≤s≤3.

[0079] In the embodiment of the present invention, relatively abundant data access modules are provided and configured on an independent data access board or a certain display unit board 3. If the data access module is configured on a certain display unit board 3, the display unit board 3 constitutes a driving board.

[0080] The data access module is one or more of an RS485 interface module, an Ethernet interface module, a 4G / 5G interface module, a WiFi interface module, and a Bluetooth interface module. The data access module is used to parse data sent, for example, via the RS485 interface module, parse the data, and then distribute the data to different display unit boards 3 via, for example, an onboard control module.

[0081] For example, the RS485 interface module and the like are commonly used interface modules in this field and will not be described in detail here.

[0082] Each display unit board 3 is provided with a latch chip and 38 decoding units. In more implementations, the latch chip and 38 decoding units are integrated into the driver IC, such as the SM536 row driver IC, which has 38 decoding units embedded in it. Dynamic scanning is achieved through the decoder, and each row of LEDs is time-sharing selected.

[0083] It should be noted that among the ICs used in LED display screens, the 38 decoder is also integrated in, for example, SN74HC245. Dynamic scanning is performed through SN74H245 to time-share each row of LEDs. At this time, for example, the row driver IC or column driver IC only needs to drive the LED lamp beads.

[0084] Latches are generally configured in, for example, the TM5020A column driver IC, which has a built-in CMOS shift register and a latching function. The latch signal LAT outputs data in parallel to the LED column driver end.

[0085] The latch chip is used to refresh the current LED plug-in module and other LED plug-in modules simultaneously through the global clock and latch signal of the host computer.

Claims

1. An LED plug-in module, characterized in that: include: The circuit board is a rectangular circuit board, and has a longitudinal expansion pin on one horizontal side of the circuit board, a longitudinal expansion socket on the other horizontal side, a transverse expansion pin on one vertical side, and a transverse expansion socket on the other vertical side, so that the LED display can be expanded horizontally and / or vertically by plugging the expansion pin into the expansion socket; LED dot matrix, arranged on the circuit board; An LED driving circuit is provided on the circuit board, and its output is connected to the LED matrix; The receiving module is used to connect to the data access board or onboard controller used as the host computer, and to connect the LED drive circuit and the corresponding expansion pins and expansion slots, to parse the data distributed by the host computer to the current LED plug-in module for display, and to send the data distributed to other expansion LED plug-in modules via the receiving module to the corresponding expansion pins and expansion slots.

2. The LED plug-in module according to claim 1, characterized in that: The extension pins and the extension socket are adapted with power cords, and the extended LED plug-in module obtains power through the extension pins and the extension socket.

3. The LED plug-in module according to claim 1 or 2, characterized in that: The extension pin and the extension socket are adapted to be a piercing type connector or a plug-in type connector.

4. The LED plug-in module according to claim 3, characterized in that: The receiving module includes a signal buffer; If the current LED plug-in module constitutes the driver board, the receiving module further includes a HUB75 interface module, and the signal buffer is connected to the Hub75 interface on the LED driver circuit through the HUB75 interface module; Correspondingly, the extension pin or extension socket is connected to the extension socket or extension pin of the next LED plug-in module for expansion of the LED plug-in module; If the current LED plug-in module constitutes an extended LED plug-in module, the signal buffer is connected to the LED driving circuit via an extension pin or an extension socket.

5. The LED plug-in module according to claim 4, characterized in that: The signal buffer is selected from SN74HC245, 74HCT245, 74LS245, SN74AHC245, 74HC595, 74HC164, MC74VHC245 or PCA9306.

6. The LED plug-in module according to claim 1, characterized in that: The LED dot matrix is m×n, wherein m and n are both integer multiples s of 8, and 1≤s≤3.

7. The LED plug-in module according to claim 1, characterized in that: The circuit board is provided with the onboard controller, and the circuit board constitutes a control board; The host computer is provided with a data access module, which is one or more of an RS485 interface module, an Ethernet interface module, a 4G / 5G interface module, a WiFi interface module, and a Bluetooth interface module.

8. The LED plug-in module according to claim 1, characterized in that: The circuit board also carries a latch chip and 38 decoding units; Wherein, 38 decoding units are integrated on the LED driving circuit; The receiving module forwards the data distributed by the host computer to other LED plug-in modules to the corresponding LED plug-in modules through the 38 decoding unit; The latch chip is used to refresh the current LED plug-in module and other LED plug-in modules simultaneously through the global clock and latch signal of the host computer.

9. The LED plug-in module according to claim 1, characterized in that: The receiving module includes a signal buffer, which is connected to the LED driving circuit through a HUB75 interface module.

10. The LED plug-in module according to claim 1, characterized in that: The back of the circuit board and / or a protective plate are installed to physically locate the components on the back of the circuit board; If the protection plate is arranged on the front side of the circuit board, the protection plate has holes for exposing the LED lamp beads.

11. The LED plug-in module according to claim 10, characterized in that: The protection plate is a grid plate or a porous plate; The protection board and the circuit board are connected by screws or rivets.

12. An LED display screen, characterized in that: The LED plug-in module comprises the LED plug-in module according to any one of claims 1 to 11.

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