LED plug-in module and LED display screen

Abstract

The utility model discloses an LED plug-in module and an LED display screen. The LED plug-in module comprises a circuit board, one transverse edge of the circuit board is provided with a longitudinal extension pin, the other transverse edge of the circuit board is provided with a longitudinal extension socket, one longitudinal edge of the circuit board is provided with a transverse extension pin, and the other longitudinal edge of the circuit board is provided with a transverse extension socket; 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 plugging module provided by the utility model, the expansibility is relatively flexible.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of LED plug-in module, and the utility model further relates to a kind of LED display screen formed by the LED plug-in module. BACKGROUND

[0002] LED display module is also called LED display module or LED module, and its application scene is very extensive, covers business, culture, government affairs, industry and multiple fields.Different application scenes have different requirements for LED display module, and in most application scenes, LED display module is fixedly arranged, although in some application scenes, LED display module includes even number of LED display unit board (generally can be referred to as LED unit board, display unit or LED unit), LED display unit is often assembled by additional cable through field wiring or prefabricated joint by plug-in mode, but this assembly is more suitable for field production of large-scale LED display screen, and after assembly, LED display screen box or shell is needed to be made to prevent water and dust packaging, and the expansibility of LED display screen is lost.

[0003] For the application scene needing to configure LED display module, such as outdoor parking indicator, relatively small outdoor billboard, signboard, sports scoreboard, relatively small traffic condition indicating screen, relatively small bus arrival indicator, gas station indicating screen, etc., the configuration flexibility of LED display module has higher requirement.Meanwhile, the size of LED display module used in this kind of application scene is relatively small, in other words, current large-scale LED dot matrix screen is not suitable for this kind of application scene.Especially in the occasion where installation space is limited, such as parking display indicator, small billboard, etc., this kind of application occasion often needs to specify the size of display screen according to installation space, and it is obviously unrealistic to need to develop a LED display screen every time.

[0004] And for some special small LED display screen, its universality is often poor, and it is difficult to adapt to various applications. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of LED plug-in module suitable for expansion, and another purpose of the utility model provides a kind of LED display screen with the LED plug-in module.

[0006] According to the first aspect of the embodiment of the utility model, a kind of LED plug-in module is provided, and its basic structure includes:

[0007] The circuit board is a rectangular circuit board, and a longitudinal expansion pin is arranged on one horizontal side of the circuit board, a longitudinal expansion socket is arranged on the other horizontal side, a horizontal expansion pin is arranged on one longitudinal side, and a horizontal expansion socket is arranged on the other longitudinal side, so as to be connected through the expansion pin and the expansion socket for horizontal expansion and / or longitudinal expansion of the LED display screen.

[0008] An LED dot matrix is arranged on the circuit board.

[0009] An LED driving circuit is arranged on the circuit board and is connected to the LED dot matrix.

[0010] A receiving module is used to connect a data access board or an on-board controller serving as an upper computer, and is connected to the LED driving circuit and the corresponding expansion pin and expansion socket, parses data distributed by the upper computer to the current LED plug-in module for display, and sends data distributed to other expansion LED plug-in modules through the receiving module to the corresponding expansion LED plug-in module through the corresponding expansion pin and expansion socket.

[0011] Optionally, the expansion pin and the expansion socket are adapted with a power line, and the expansion LED plug-in module obtains power through the expansion pin and the expansion socket.

[0012] Optionally, the expansion pin and the expansion socket are adapted as a piercing connector or a plug-in connector.

[0013] Optionally, the receiving module includes a signal buffer.

[0014] If the current LED plug-in module constitutes a driving board, the receiving module further includes a HUB75 interface module, and the signal buffer is connected to the Hub75 interface on the LED driving circuit through the HUB75 interface module.

[0015] Correspondingly, the expansion pin or the expansion socket is connected to the expansion socket or the expansion pin of the next LED plug-in module, so as to expand the LED plug-in module.

[0016] If the current LED plug-in module constitutes an expansion LED plug-in module, the signal buffer is connected to the LED driving circuit through the expansion pin or the expansion socket.

[0017] Optionally, the signal buffer is selected from SN74HC245, 74HCT245, 74LS245, SN74AHC245, 74HC595, 74HC164, MC74VHC245 or PCA9306.

[0018] Optionally, the LED dot matrix is m×n, where m and n are both integer multiples of 8, and 1≤s≤3.

[0019] Optionally, the circuit board is provided with the on-board controller, and the circuit board constitutes a control board.

[0020] The upper computer is provided with a data access module, and 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.

[0021] Optionally, the circuit board is further provided with a latch chip and a 38 decoding unit.

[0022] The 38 decoding unit is integrated on the LED driving circuit.

[0023] The receiving module forwards the data distributed by the upper computer to other LED plug-in modules to the corresponding LED plug-in modules through the 38 decoding unit.

[0024] The latch chip is used for simultaneous refreshing of the current LED plug-in module and other LED plug-in modules through the global clock and the latch signal of the upper computer.

[0025] Optionally, the receiving module comprises a signal buffer connected to the LED driving circuit through a HUB75 interface module.

[0026] Optionally, a protective plate is mounted on the back and / or front of the circuit board to physically protect the components on the back of the circuit board.

[0027] If the protective plate is arranged on the front of the circuit board, the protective plate has holes for exposing the LED lamp beads.

[0028] Optionally, the protective plate is a lattice plate or a perforated plate.

[0029] The protective plate and the circuit board are connected by screws or rivets.

[0030] According to the second aspect of the embodiment of the utility model, an LED display screen is provided, which comprises the LED plug-in module of the first aspect of the utility model.

[0031] In the embodiment of the utility model, the circuit board of the LED plug-in module is rectangular plate, and four edges of the rectangular plate are divided into two groups, one group is the group of longitudinal edges in the mounting state, and the transverse expansion plug-in assembly is arranged, and the other group is the group of horizontal edges in the mounting state, and the longitudinal expansion plug-in assembly is arranged. Each expansion plug-in assembly includes an expansion socket and a corresponding expansion pin, so that the plug-in can be conveniently completed on the mechanical plug-in. 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 with the LED plug-in module through the expansion plug-in assembly, or the LED plug-in module and the data access board are directly or indirectly connected, so as to realize the data distribution of the host computer. At present, for example, the technology supporting hot plug and the like is very mature, when a new LED plug-in module is plugged in, the logical address can be reported or allocated by the host computer, without developing a new driver program or hardware configuration, so that the LED display screen of the corresponding size can be arranged on site, and the overall expansion convenience is good. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structure schematic view of the LED display screen with four LED plug-in modules in an embodiment.

[0033] Figure 2 It is a structure schematic view of the back of the LED plug-in module in an embodiment.

[0034] Figure 3 It is a structure schematic view of the connection between the circuit board and the grid plate in an embodiment.

[0035] Figure 4 It is an electrical schematic diagram of the LED plug-in module in an embodiment.

[0036] In the drawing: 1. longitudinal expansion socket, 2. transverse expansion pin, 3. display unit plate, 4. longitudinal expansion assembly, 5. transverse expansion assembly, 6. longitudinal expansion pin, 7. transverse expansion socket, 8. rivet, 9. rivet hole, 10. lamp bead fixing hole, 11. grid, 12. circuit board.

[0037] 111. transverse rib, 112. longitudinal rib. DETAILED DESCRIPTION

[0038] In order to make the utility model more clearly, the technical scheme for realizing the utility model and the advantages thereof, the utility model is further described below in combination with the drawings and embodiments. It should be understood that the means described in the embodiments of the utility model are only part of the technical implementation of the corresponding technical problems, and are not used to limit the utility model.

[0039] It should be noted that, Figure 1 The LED display screen formed by the four LED plug-in modules is a regular rectangular display screen, but based on the concept of the present application, the LED display screen formed is not limited to a regular rectangular display screen. For example, the LED display screen can have three LED plug-in modules in the lower row and only one LED plug-in module in the upper row. The LED display screen with one LED plug-in module in the upper row can be plugged into any one of the three LED plug-in modules in the lower row, thereby forming a special-shaped LED display screen. From this side, the flexibility of the LED plug-in module expansion based on the embodiment of the present application is relatively good.

[0040] Further, if the finally formed LED display screen is an LED display screen formed by a plurality of rows and a plurality of columns of LED plug-in modules, each LED plug-in module is connected to at least two other LED plug-in modules, and the overall structural reliability is relatively good.

[0041] It should be understood that the display content can be displayed in split screen or as a whole, to reflect the flexibility and interest of the display content. It should be understood that the LED display screen can be used for scrolling display, so that if the number of input characters is greater than the single-screen display capacity of the LED display screen, the characters can be displayed in a scrolling manner.

[0042] The LED plug-in module based on the embodiment of the present application is suitable for relatively small LED display screens, such as temporary arrangements in squares, so that the main purpose is to quickly arrange or store, and it can also be applied to non-standard screens and customized screen scenarios.

[0043] Referring to the description Figure 1 The LED display screen is formed by four LED plug-in modules, and the LED plug-in module is represented as a display unit board 3 in the figure, and other components of the LED display screen are not shown.

[0044] As can be seen from the figure, the display unit board 3, that is, the circuit board 12 of the LED plug-in module, is a rectangular board. In the figure, a longitudinal expansion pin 6 is provided on the upper side of the circuit board 12, a longitudinal expansion socket 1 is provided on the lower side, a transverse expansion pin 2 is provided on the left side, and a corresponding transverse expansion socket 7 is provided on the right side. As for the positions of the expansion pins and the expansion sockets on the circuit board 12, they can obviously be interchanged, as long as all the LED plug-in modules adopt the same arrangement.

[0045] Correspondingly, for the convenience of description, the plug-in assembly formed by the transverse expansion socket 7 and the transverse expansion pin 2 is referred to as a transverse expansion assembly 5, and the plug-in assembly formed by the longitudinal expansion socket 1 and the longitudinal expansion pin 6 is referred to as a longitudinal expansion assembly 4.

[0046] Since the transmission of the data signal of the LED display screen often needs to transmit, for example, 8-bit, 16-bit or more data, the number of pins of the pin, for example, the longitudinal expansion pin 6 is usually not less than 20 pins, the pin pitch is 2.54 mm, for example, a 20PIN horn seat connector has a certain mechanical connection strength, in other words, even without other mechanical connection parts, simply relying on, for example, the longitudinal expansion assembly 4 and the transverse expansion assembly 5 can make the assembled LED display screen structure relatively reliable.

[0047] As described above, the LED plug-in module based on the embodiments of the utility model is mainly suitable for relatively small LED display screens, such as the number of LED lamp beads in the LED dot matrix on each LED plug-in module is 8x8, 8x16, 8x24, 16x8, 16x16, 16x32, all belong to small size LED plug-in modules, the weight of the circuit board itself is relatively small, and a simple horn seat connector can realize reliable connection.

[0048] In addition, in Figure 1 In the example structure, for example, the longitudinal expansion pin 6 has two groups of pins on the upper plate edge of a piece of LED plug-in module, one group of pins can be used as an expansion power pin, and the other group of pins can be used as a communication interface, and the two groups of pins have a given span, which can further improve the overall connection strength and meet the connection strength between small size specifications of LED plug-in modules, so that the product can still be reliably assembled without providing other special mechanical connection structures.

[0049] In addition, for example, the expansion power pin can be integrated into, for example, a horn seat connector, that is, the expansion power pin 6 can be reused between different power modules of LED plug-in modules, or part of the pins in a pin seat of the longitudinal expansion pin 6 are used for connection between power modules, and part of the pins are used for communication.

[0050] The above shows that since it is used for small size specifications of LED plug-in modules, the corresponding plug-in assembly of each LED plug-in module is adapted with a power input / output interface, and a power interface does not need to be additionally provided, that is, the expansion LED plug-in module only needs to be plugged into the currently assembled LED plug-in module, and does not need to be additionally connected to a power line, and the assembly is convenient.

[0051] In addition, if the extension power connector assembly is provided separately, only the transition circuit is needed on the current display unit board, and although part of the power is lost (mainly line loss) based on the connection between the boards, the loss of part of the power has little effect on the driving of the LED lamp beads due to the small size of the LED plug-in module, compared with providing a cable for each LED plug-in module.

[0052] Even if the extension power pin and the pin of the communication module are integrated into an extension connector assembly, the power cable can be routed separately on the circuit board 12, and the overall power loss is still mainly line loss.

[0053] The power module is mainly configured on the drive board (data access board), and can also be configured on a certain LED plug-in module as the main board. The power module can use a constant current IC, such as a constant current IC with a model number of TPS5430, which drives each LED plug-in module in a parallel manner through the configuration of the connector pin and seat.

[0054] The configuration mode of the foregoing separate configuration of the power extension pin / seat is equivalent to distributed power supply, which can avoid long-distance voltage drop, but requires a spare power plug with the maximum expansion quantity as a second choice.

[0055] In addition, it is required that the longitudinal positions of the transverse extension socket 7 and the transverse extension pin 2 on the same circuit board 12 are corresponding, so that the corresponding board edges between the circuit boards 12 of adjacent LED plug-in modules are flush in the assembled state.

[0056] Based on the foregoing description, the LED plug-in module is used as an expansion unit, which can be assembled in a plug-in manner on site, and the number of LED plug-in modules can be determined according to the site conditions. The data access board usually has an adaptive function, that is, the way of outputting information on the LED display screen can be determined according to the size of the assembled LED display screen, which is general knowledge and will not be described here.

[0057] Expansion can be performed in the longitudinal direction or in the transverse direction, so that convenient expansion can be performed on site. This kind of plug-in expansion mode does not require on-site personnel to have corresponding professional knowledge, and has relatively good adaptability.

[0058] Generally speaking, for LED display screen, it is often necessary to configure a box or a shell to protect the circuit board 12, etc., wherein for example, the box usually adopts a die-cast aluminum shell to provide support and protection. In the embodiments of the present application, firstly, the LED display screen is mainly suitable for small size specifications, and considering rapid expansion, it is impossible to provide a box or a shell for the assembled LED display screen, and providing a box or a shell for each LED plug-in module will affect the configuration of the plug-in assembly. Therefore, in the preferred embodiments of the present application, a simple protection measure for the circuit board 12 is adopted.

[0059] Referring to the structure shown in the figure, the grid 11 is fixed on the back surface of the circuit board 12 (the surface provided with the lamp beads is the front surface, and the surface opposite to the front surface is the back surface), the grid 11 in the figure is composed of longitudinal and transverse intersecting ribs, and can also be understood as a grid plate. Figure 2 The circuit board 12 is fixed on the grid 11 by means of riveting or screw connection, and the grid 11 can improve the strength of the LED plug-in module and effectively protect the circuit board 12.

[0060] In addition, the grid 11 has a grid, which is beneficial to heat dissipation of the circuit board. In addition, the grid 11 can be black, which is in sharp contrast with the LED lamp beads and is not easy to cause dizziness when viewed by people.

[0061] Therefore, in some embodiments, a grid 11 can also be configured on the front surface of the circuit board 12, which not only protects the LED lamp beads but also constitutes a grid-shaped background of the display screen.

[0062] In the exemplary structure, the grid and the LED lamp bead fixing hole 10 correspond one by one, which can effectively dissipate heat and has a relatively dense shielding structure.

[0063] Figure 2 Regarding the fixing points between the grid 11 and the circuit board 12, there are at least four, to ensure reliable fixation between the circuit board 11 and the grid 11.

[0064] The grid 11 preferably adopts a plastic grid, and a metal mesh plate can also be used. Whether it is a plastic grid or a metal mesh plate, the main function is to protect the components on the back surface of the circuit board 12 and the printed circuit, etc. Another function is to consider heat dissipation, which is dissipated through the grid or mesh hole.

[0065] Since insulation needs to be considered in some applications, the grid 11 preferably adopts a plastic grid.

[0066] The protection plate such as the grid 11 can be cut according to the size of the circuit board 12, and can also be designed to avoid gaps according to the position of the expansion plug-in assembly.

[0067] The protection plate such as the grid 11 can be cut according to the size of the circuit board 12, and can also be designed to avoid gaps according to the position of the expansion plug-in assembly. ​

[0068] Based on the above design for protecting the circuit board 12, the protection of the circuit board 12 can still be met under the condition of meeting the rapid expansion, and there is basically no interference between each other.

[0069] In addition, the increased weight is relatively small by using the configuration such as the grid 11, and the overall load increase of the assembly formed by the connector is relatively small for the LED display screen, so that the mechanical connection formed by the connector expansion itself can still be met.

[0070] It should be particularly pointed out that in the embodiment of the utility model, the protection plate such as the grid 11 is used, and the purpose is to only consider simple protection, and the overall packaging of the LED display screen is not considered, and the overall packaging of the LED connector module is not considered, under the condition, for example, the grid 11 provides protection for the circuit board 12, and the structure of itself is also beneficial to the heat dissipation of the circuit board, so that it is not necessary to specially provide a special forced cooling component such as a fan.

[0071] Regarding the distribution of the LED lamp beads on the circuit board 12, there is no difference due to the design for facilitating expansion in the embodiment of the utility model, and the LED lamp beads still form the LED dot matrix in the form of row and column matrix.

[0072] The distribution form of the LED dot matrix on the circuit board 12 and the like belong to the prior art, and are irrelevant to the improved content of the utility model, and will not be described here.

[0073] As a necessary configuration, the LED driving circuit is provided on each LED connector module, and the LED driving circuit is mainly a row driving IC and a column driving IC. The LED driving circuit is also a inherent configuration of the LED module, for example, the column driving IC with the model TM5020A is a commonly used LED / illumination driver at present, the built-in CMOS shift register and latch function of which can convert the serial input data into parallel output data format. The TM5020A has 16 current sources, which can provide 3~36mA constant current at each output port to drive the LED, and each OUT driving channel output can be short-circuited to obtain greater current output, and the output current is little affected when the environment changes. At the same time, an external resistance with different resistance (REXT) can be selected to adjust the current size of each output port of the TM5020A, so that the luminous brightness of the LED can be accurately controlled, and it is suitable for high-quality white balance display driving module.

[0074] The basic parameters of the TM5020A are as follows:

[0075] 16 constant current source output channels;

[0076] The OUT port withstand voltage can be guaranteed to be 11V;

[0077] Constant current range 3-36mA @ VDD=5V; 3-20mA @ VDD=3.3V;

[0078] Very accurate current output value, maximum error: ≤ ± 2.0% (channel to channel), ≤ ± 3.0% (chip to chip);

[0079] By adjusting the external resistance, the current output value of 16 OUTs can be precisely set;

[0080] Output current fast response: minimum pulse width = 35 nS;

[0081] Up to 25MHz data transmission rate;

[0082] High input characteristic with Schmidt trigger;

[0083] Operating voltage: 3.3V-5V;

[0084] Package form: SSOP24-0.635 (QSOP24).

[0085] For example, the model SM5363 row drive IC is a product of Shenzhen Ming Microelectronics Co., Ltd., and is also a commonly used LED / lighting driver. For such commonly used LED / lighting drivers, they all belong to commonly used ICs in the art, and are irrelevant to the improved content of the embodiments of the utility model, and will not be described here.

[0086] In addition, the LED driving circuit for the LED dot matrix is obviously not limited to Figure 4 The example driving IC, etc. At present, the application range of LED display screens is extremely wide, and the production manufacturers of LED driving ICs are numerous, therefore, Figure 4 The example power supply principle diagram is exemplary, rather than uniquely limited.

[0087] Figure 4 The model SN74HC245DW (Texas Instruments) is an eight-way bus receiver, which is used for external data access board or on-board controller on the same circuit board.

[0088] The SN74HC245DW is a wide operating voltage input of 2V to 6V, high current tri-state output, directly driving the bus or up to 15 LSTTL loads; the self-power consumption is relatively low. The output drive is ±6mA (when the voltage is 5V). The bus transceiver including the SN74HC245DW is designed for asynchronous bidirectional communication between data buses. The control function implementation can greatly reduce the external timing requirements. The SN74HC245DW is mainly used as a bus control device in the embodiments of the utility model, so as to be connected with the upper computer, and facilitate the quick plugging of the LED plugging module.

[0089] In addition, Figure 4 The pin definition of SN74HC245 in the above is the standard pin definition of it, for example, according to the logic level on the direction control (DIR) input, such device will send data from A bus to B bus, or send data from B bus to A bus. The output enable (OE) input can be used to disable the device, so as to effectively isolate the bus.

[0090] Such bus transceiver is specially designed for asynchronous bidirectional communication between data buses. The control function implementation can greatly reduce the external timing requirements. The current LED plug-in module is connected with other expanded LED plug-in modules through, for example, expansion sockets or expansion pins, and the bus receiver on the other LED plug-in module is used to connect with the corresponding expansion pin or socket for forwarding the data to be displayed forwarded by the other LED plug-in module.

[0091] The data access board or the on-board controller is connected with the input device through the data access module, and the data input device is, for example, a mobile phone, a PC, etc., and the corresponding data access module can be, for example, a WiFi module, etc., a 4G / 5G module, etc.

[0092] In addition, Figure 4 As can be seen from the exemplary structure, the SN74HC245 used as the access module is also used for forwarding data, so as to be connected with the corresponding expansion pin and expansion socket on the board while connecting the LED driving circuit on the current board, so as to forward data and supply power to other LED plug-in modules plugged with the current LED plug-in module.

[0093] Further, the SN74HC245 analyzes the data distributed by the upper computer for display of the current LED plug-in module, and sends the data distributed by the receiving module to other expansion LED plug-in modules plugged with the board through the corresponding expansion pin and expansion socket to the corresponding expansion LED plug-in module.

[0094] The aforementioned ox horn seat is a kind of cut-in connector (also called cut-in connector or cut-in connector, i.e. cut-in joint), which is a kind of connector used for realizing electrical signal transmission in an electrical circuit. It is composed of two parts, one is a skeleton made of insulating body, and the other is a metal conductor assembled on the skeleton. There are many kinds of cut-in connectors, which are divided into single-pole type (singlepole) and double-pole type (doublepoles) according to structure. According to use, they can be divided into power connectors, communication connectors and switch connectors, etc. In the embodiments of the utility model, the cut-in connector used is a communication connector, which can also be a multiplexed connector of communication connector and power connector.

[0095] The piercing connector has high connection strength, but the terminal cannot be reused after piercing. In the embodiment of the utility model, the expansion plug-in assembly for plugging should meet frequent plugging, and therefore a plug-in connector is preferably adopted.

[0096] For example, the conventional RJ45 plug-in connector, RJ11 / RJ11 plug-in connector, USB plug-in connector, HDMI plug-in connector, DP plug-in connector, MPO / MTP optical fiber plug-in connector, DB plug-in connector, M12 plug-in connector, etc. all belong to such plug-in connectors. Figure 4 In the exemplary structure, the connector used for expansion plug-in is a 321016MG0CBK00A03 package horn.

[0097] In addition, for the SN74HC245, a signal buffer can also be configured to register related data. Correspondingly, if the current LED plug-in module constitutes a driving board, the receiving module further comprises a HUB75 interface module, and the signal buffer is connected to the LED driving circuit through the HUB75 interface module, so as to appropriately limit the current.

[0098] Further, the expansion pin or expansion socket is connected to the HUB75 interface module, so as to expand the LED plug-in module.

[0099] If the current LED plug-in module constitutes an expanded LED plug-in module, the signal buffer is connected to the LED driving circuit through a buffer resistor, such as R141 and RN10 shown in the figure. Figure 4

[0100] Further, the signal buffer is selected from SN74HC245, 74HCT245, 74LS245, SN74AHC245, 74HC595, 74HC164, MC74VHC245 or PCA9306.

[0101] The LED dot matrix is m x n, where m and n are both integer multiples of 8s, and 1≤s≤3.

[0102] In the embodiment of the utility model, relatively rich data access modules are provided 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.

[0103] 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 analyze data issued through the RS485 interface module, for example, and then distribute the data to different display unit boards 3 through a control module on board, for example.​

[0104] For example, RS485 interface module, etc., all belong to the commonly used interface module in the art, not described here.

[0105] Each display unit board 3 is provided with a latch chip and a 38 decoding unit, which is integrated in the driving IC in more implementations, such as SM536 row driving IC, which embeds a 38 decoding unit, and realizes dynamic scanning through the decoder to select each row of LED in time.

[0106] It should be noted that in the IC used in the LED display screen, the 38 decoder is also integrated in, for example, SN74HC245, which realizes dynamic scanning through SN74H245 to select each row of LED in time, at this time, for example, row driving IC or column driving IC only needs to realize the driving of LED lamp beads.

[0107] And the latch is basically configured in, for example, TM5020A column driving IC, which has a CMOS shift register and a latch function, and the latch signal LAT outputs data in parallel to the LED column driving end.

[0108] The latch chip uses the global clock and the latch signal of the upper computer to refresh the current LED plug-in module and other LED plug-in modules at the same time.

Claims

1. An LED plug-in module, characterized in that, include: The circuit board is a rectangular circuit board with a vertical expansion pin on one horizontal side and a vertical expansion socket on the other horizontal side, a horizontal expansion pin on one vertical side and a horizontal expansion socket on the other vertical side, so as to use the connection between the expansion pin and the expansion socket for the horizontal and / or vertical expansion of the LED display screen. LED dot matrix is ​​arranged on the circuit board; An LED driver circuit is mounted on the circuit board and its output is connected to the LED dot matrix. The receiving module is used to connect to the data access board or onboard controller used as a host computer, and to connect to the LED driving circuit and the corresponding expansion pins and expansion slots. It parses the data distributed by the host computer to the current LED plug-in module for display, and sends the data distributed to other extended LED plug-in modules via the receiving module to the corresponding extended LED plug-in modules through the corresponding expansion pins and expansion slots.

2. The LED plug-in module according to claim 1, characterized in that The expansion pins and expansion sockets are equipped with power cords, and the extended LED plug modules obtain power through the expansion pins and expansion sockets.

3. The LED plug-in module according to claim 1 or 2, characterized in that The expansion pins and expansion sockets are adapted to either piercing connectors or mating connectors.

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 a driver board, the receiving module also 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. Accordingly, the expansion pin or expansion socket is connected to the expansion socket or expansion pin of the next LED plug module for expansion of the LED plug module; If the current LED plug-in module constitutes an extended LED plug-in module, the signal buffer is connected to the LED driver circuit through an extended pin or an extended 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, wherein The LED dot matrix is ​​m×n, where m and n are both integer multiples of 8 s, and 1≤s≤3.

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

8. The LED plug-in module according to claim 1, wherein, The circuit board also contains latch chips and 38 decoding units; Among them, the 38 decoding unit is 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 uses the global clock and latch signal of the host computer to refresh the current LED plug-in module and other LED plug-in modules simultaneously.

9. The LED plug-in module according to claim 1, wherein, The receiving module includes a signal buffer, which is connected to the LED driving circuit via 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 is installed to protect the components on the back of the circuit board. If the protection plate is arranged on the front surface of the circuit board, the protection plate has holes for exposing the LED lamp beads.

11. The LED patch module of claim 10, wherein, The protection plate is a lattice plate or a porous plate. The protection plate and the circuit board are connected by screws or rivets.

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

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