CN220340891U - LED display screen interface circuit - Google Patents
LED display screen interface circuit Download PDFInfo
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- CN220340891U CN220340891U CN202321461191.2U CN202321461191U CN220340891U CN 220340891 U CN220340891 U CN 220340891U CN 202321461191 U CN202321461191 U CN 202321461191U CN 220340891 U CN220340891 U CN 220340891U
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Abstract
The utility model relates to the field of custom interfaces, and particularly discloses an LED display screen interface circuit which comprises a first socket circuit, a second socket circuit and a data line; the first socket circuit is arranged on the LED display screen and comprises a first power supply circuit, a HUB75 decoding circuit, a nonvolatile memory circuit and a multi-pin socket; the second socket circuit is arranged on the decoding board and comprises a second power supply circuit, a HUB75 transcoding circuit, an SPI reading circuit and a multi-pin socket; the multi-pin socket is powered by at least two interface pins, sixteen interface pins transmit HUB75 protocol signals, and four interface pins transmit SPI protocol signals. According to the utility model, by redesigning the interface circuit of the LED display screen, the HUB75 protocol driving function is reserved, and meanwhile, the power supply function and the function expansion interface are additionally added, so that one interface is connected with a data line, and the whole LED display screen can be completely driven.
Description
Technical Field
The utility model relates to the field of LED display control, in particular to an LED display screen interface circuit.
Background
Along with the rapid popularization of full-color LED display screens, more and more LED large screens are applied to the fields of various office halls, entertainment scenes, lecture halls, campuses, outdoor advertisements and the like, and display screen control circuits and driving boards matched with the LED large screens are also developed.
The most common control interface for the existing LED display screen is HUB75 interface, which has two RGB channels (R1/R2/G1/G2/B1/B2), 5 pins A/B/C/D/E are row decoding channels, LAT is data latch channel, CLK is data clock, OE is low level enabled LED display. However, using the HUB75 protocol to transmit signals has the following drawbacks:
1. the HUB75 interface is not provided with a power supply pin, the LED display screen needs to be additionally connected with a power supply, the power cannot be taken from the interface, and a large number of power supplies and wires need to be arranged to supply power when the spliced large screen is arranged;
2. only can drive the LED display screen to display, can not carry out function expansion, and when installing new LED display screen at every turn, the LED screen parameter on the decoding board needs to be reconfigured, wastes time and energy and is easy to make mistakes.
Disclosure of Invention
In order to overcome the problems, the utility model provides an LED display screen interface circuit.
The technical scheme adopted by the utility model is as follows: an LED display screen interface circuit comprises a first socket circuit, a second socket circuit and a data line;
the first socket circuit is arranged on the LED display screen and comprises a first power supply circuit, a HUB75 decoding circuit, a nonvolatile memory circuit and a multi-pin socket;
the first power supply circuit is used for accessing direct current through the multi-pin socket and supplying power to the LED display screen, the HUB75 decoding circuit and the nonvolatile storage circuit;
the HUB75 decoding circuit is used for converting an input HUB75 protocol signal into a control signal of the LED display screen;
the nonvolatile storage circuit is used for storing configuration parameters and/or driving programs of the LED display screen through a memory device communicated with an SPI protocol;
the first power supply circuit, the HUB75 decoding circuit and the nonvolatile memory circuit are electrically connected with the multi-pin socket;
the second socket circuit is arranged on the decoding board and comprises a second power supply circuit, a HUB75 transcoding circuit, an SPI reading circuit and a multi-pin socket;
the second power supply circuit is used for accessing a power supply from an external circuit and converting the power supply into direct current output for driving the LED display screen;
the HUB75 transcoding circuit is used for converting the video signals input into the decoding board by the external circuit into HUB75 protocol signals and outputting the HUB75 protocol signals to the multi-pin socket;
the SPI reading circuit is used for acquiring configuration parameters and/or driving programs of the LED display screen through an SPI protocol;
the second power supply circuit, the HUB75 transcoding circuit and the SPI reading circuit are electrically connected with the multi-pin socket;
at least twenty-two interface pins are arranged in the multi-pin socket, wherein at least two interface pins are used for supplying power, sixteen interface pins in the multi-pin socket are used for transmitting HUB75 protocol signals, and four interface pins in the multi-pin socket are used for transmitting SPI protocol signals;
the data line is two plugs connected through a wire, and the plugs are matched and connected with the multi-pin socket.
Preferably, the first socket circuit further comprises an anti-reverse connection detection circuit, and the anti-reverse connection detection circuit is used for communicating and starting the first socket circuit to work normally after detecting that the data line is correctly connected.
Preferably, twenty-eight interface pins are arranged in the multi-pin socket, wherein four interface pins are connected with the positive electrode of the power supply, and four interface pins are connected with the negative electrode of the power supply.
Preferably, a third socket circuit is further arranged on the LED display screen, and the third socket circuit is used for switching the first socket circuit of another LED display screen.
Preferably, a first filter module is arranged in the first power supply circuit, and a second filter module is arranged in the second power supply circuit.
The beneficial effects of the utility model are as follows:
(1) Through redesigning the interface circuit of LED display screen, when having kept HUB75 agreement drive function, additionally increased power supply function and function expansion interface, make an interface access data line can drive whole LED display screen completely.
(2) The configuration parameters and/or the driving program of the LED display screen are stored by the nonvolatile memory circuit, so that the decoding board is convenient to read, and after any new LED display screen with the interface circuit is connected to the decoding board, parameter configuration can be automatically completed, and labor consumption and configuration time are reduced.
Drawings
The utility model will be further described with reference to the accompanying drawings, in which:
FIG. 1 is a diagram showing a circuit connection relationship according to one embodiment of the present utility model;
fig. 2 is a schematic diagram of a multi-pin socket pin according to another embodiment of the present utility model;
FIG. 3 is a schematic diagram of a nonvolatile memory circuit according to another embodiment of the present utility model;
in the figure: 1. a first socket circuit; 101. a first power supply circuit; 102. HUB75 decoding circuitry; 103. a nonvolatile memory circuit; 2. a second socket circuit; 201. a second power supply circuit; 202. HUB75 transcoding circuitry; 203. SPI reading circuit; 3. a multi-pin socket; 4. a data line; 5. an LED display screen; 6. and decoding the board.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, which is one embodiment of the present utility model, the present embodiment specifically discloses a custom interface circuit applied to an LED display 5, including a first socket circuit 1, a second socket circuit 2, and a data line 4;
the first socket circuit 1 is arranged on the LED display screen 5, and the first socket circuit 1 comprises a first power supply circuit 101, a HUB75 decoding circuit 102, a nonvolatile memory circuit 103 and a multi-pin socket 3;
the first power supply circuit 101 is used for accessing direct current through the multi-pin socket 3 and supplying power to the LED display screen 5, the HUB75 decoding circuit 102 and the nonvolatile memory circuit 103;
the HUB75 decoding circuit 102 is configured to convert an input HUB75 protocol signal into a control signal of the LED display screen 5, and output the control signal to the LED display screen 5;
the nonvolatile storage circuit 103 is used for storing configuration parameters and/or driving programs of the LED display screen 5 through a memory device in SPI protocol communication; the memory device is a ROM or Flash chip;
the first power supply circuit 101, the HUB75 decoding circuit 102 and the nonvolatile memory circuit 103 are electrically connected with the multi-pin socket 3;
the second socket circuit 2 is arranged on the decoding board 6, and the second socket circuit 2 comprises a second power supply circuit 201, a HUB75 transcoding circuit 202, an SPI reading circuit 203 and a multi-pin socket 3;
the second power supply circuit 201 is used for accessing a power supply from an external circuit and converting the power supply into direct current output for driving the LED display screen;
the HUB75 transcoding circuit 202 is used for converting the video signal input from the external circuit to the decoding board 6 into a HUB75 protocol signal and outputting the signal to the multi-pin socket;
the SPI reading circuit 203 is used for reading configuration parameters and/or drivers of the LED display screen 5 from the nonvolatile memory circuit 103 through an SPI protocol;
the second power supply circuit 201, the HUB75 transcoding circuit 202 and the SPI read circuit 203 are electrically connected to the multi-pin socket 3;
at least twenty-two interface pins are arranged in the multi-pin socket 3, wherein at least two interface pins are used for supplying power, sixteen interface pins in the multi-pin socket 3 are used for transmitting HUB75 protocol signals, and four interface pins in the multi-pin socket 3 are used for transmitting SPI protocol signals;
the data line 4 is two plugs connected through wires, and the plugs are matched and connected with the multi-pin socket 3.
The nonvolatile memory circuit 103 of the present embodiment needs to be matched with an SPI memory chip, such as a W25Q80DVSNIG chip. Four wires are arranged in the SPI protocol, SCK, MISO, MOSI and CS are used for providing clock signals, MISO and MOSI are used for providing data signals, CS is a chip select signal, a CS (chip select signal) pin is changed to be low level before communication starts, SPI Flash only works, when data is input, the clock SCK is matched with the MOSI to input the data into a storage, the storage is arranged on an LED lamp panel, thus the data is stored along with the LED lamp panel, and when the data needs to be read from the lamp panel, the clock SCK is matched with the MISO to read the data from the storage.
The nonvolatile memory circuit 103 stores configuration parameters and/or driving programs of the LED display screen 5, so that the hardware implementation cost is low, the driving is easy, the decoding board 6 is convenient to read, and the configuration of parameters can be automatically completed after any new LED display screen 5 with the interface circuit is connected with the decoding board 6, so that the manpower consumption and the configuration time are reduced.
Referring to fig. 2, as another embodiment of the present solution, the multi-pin socket 3 of the present embodiment is a DC3-28P header. The pins 1, 2, 3 and 4 are connected with the positive electrode of the power supply, and the pins 5, 6, 7 and 8 are connected with the negative electrode of the power supply. The first power supply circuit 101 provides direct current of 5V, and four pairs of power supply pins ensure that the socket and the plug can transmit larger current, so that the risk of burning out the multi-pin socket 3 is reduced. Pins 9 through 24 are used to transmit HUB75 protocol signals and pins 25, 26, 27, 28 are used for SPI data transmission. In the first socket circuit 1, pins 1 to 8 of the multi-pin socket 3 are connected to the first power supply circuit 101, pins 9 to 24 are connected to the HUB75 decoding circuit 102, and pins 25, 26, 27, 28 are connected to the nonvolatile memory circuit 103; in the second socket circuit 2, pins 1 to 8 of the multi-pin socket 3 are connected to the second power supply circuit 201, pins 9 to 24 are connected to the HUB75 transcoding circuit 202, and pins 25, 26, 27, 28 are connected to the SPI reading circuit 203.
The conventional display screen displays, a video source needs to compile through a compiling board speaking signal, the video signal is converted into a driving signal which can be identified by the LED display screen 5 through the decoding board 6, namely a common HUB75 protocol signal, so that the display screen displays are driven, and for simplicity of explanation, the front-stage equipment of the LED display screen 5 is noted as the decoding board 6.
The decoding board 6 drives the LED display screen 5, signals which can be identified by the chips of the LED display screen 5 are required to be output according to the chips used on the LED display screen 5, and the LED display screen 5 can work normally only by setting corresponding programs according to the chips manually. The program of completion of the setting is stored in the decoding board 6. If the decoding board 6 corresponds to the LED display 5, the chip type used by the LED display 5 is a chip, the corresponding program is a program, when the decoding board 6 is unchanged, another LED display 5 is replaced, and the chip signals may be different, at this time, because the decoding board 6 has no new driver for the LED display 5, and the drivers for driving the two LED displays 5 are also different, at this time, the LED display 5 needs to be displayed normally, and the driver for the decoding board 6 needs to be set for the LED display 5 again. It is also possible that the driving programs are the same, but the configuration parameters of the two LED display screens 5 are different, and at this time, the decoding board 6 is required to automatically read the configuration parameters of the new LED display screen 5, so as to complete the parameter update of the configuration program.
The embodiment adopts SPI protocol to solve the above problems, and each LED display screen 5 is externally hung with a storage chip (Flash) adopting SPI communication protocol. When the LED display screen 5 leaves the factory, the configuration parameters and/or the driving programs of the LED display screen 5 are stored in a storage chip (Flash), and the LED display screen 5 is provided with the corresponding configuration parameters and/or driving programs. Even if the LED display screen 5 is replaced, the decoding board 6 can read the program from the storage chip by using the SPI communication protocol, and then the read program is loaded, so that program debugging is not needed.
The first power supply circuit of the embodiment is provided with a first filtering module, the second power supply circuit is provided with a second filtering module, and the first filtering module and the second filtering module are connected in parallel by adopting a plurality of filtering capacitors and are used for reducing the induced electricity and unstable voltage from damaging the LED display screen and the circuit of the decoding board.
In other embodiments, a storage chip with larger capacity may be selected, so that not only configuration parameters and/or drivers may be stored, but also other information of the LED display 5, such as specifications, production date, etc. of the LED display 5 may be stored together. When the LED display screen 5 is used, the decoding board 6 reads out from the storage chip of the LED display screen 5 through the SPI communication protocol, and the corresponding parameters of the LED display screen 5 can be displayed.
Referring to fig. 3, as a further embodiment of the present solution, the first socket circuit 1 of the present embodiment further includes an anti-reverse connection detection circuit, where the anti-reverse connection detection circuit is used to connect and start the first socket circuit 1 to operate normally after detecting that the data line 4 is correctly turned on, the detection end of the anti-reverse connection detection circuit is connected to the multi-pin socket 3, and the control end of the anti-reverse connection detection circuit is connected to the first power supply circuit 101, the HUB75 decoding circuit 102 and the nonvolatile memory circuit 103.
In fig. 3, U1 is a storage chip, where in this embodiment, U1 is a W25Q80 or W25Q16 of Winbond corporation, or GD25Q80 or GD25Q16 of GigaDevice, and in other embodiments, the storage chip may be an SD card in SPI mode and a read/write circuit matched with the SD card; u2 is a voltage reduction chip of the first power supply circuit 101 of this embodiment, which reduces the voltage of the 5V dc to 3.3V for driving the storage chip.
Preferably, the LED display 5 of the present embodiment is further provided with a third socket circuit, and the third socket circuit is used for switching the first socket circuit 1 of another LED display 5. Therefore, a plurality of LED display screens 5 can be connected in series to be driven by the same driving plate, and the length and difficulty of wiring are reduced.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present utility model, and are not to be construed as limiting the scope of the utility model. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present utility model are intended to be included in the scope of the present utility model.
Claims (5)
1. An LED display screen interface circuit is used for connecting an LED display screen and a decoding board and is characterized by comprising a first socket circuit, a second socket circuit and a data line;
the first socket circuit is arranged on the LED display screen and comprises a first power supply circuit, a HUB75 decoding circuit, a nonvolatile memory circuit and a multi-pin socket;
the first power supply circuit is used for accessing direct current through the multi-pin socket and supplying power to the LED display screen, the HUB75 decoding circuit and the nonvolatile storage circuit;
the HUB75 decoding circuit is used for converting HUB75 protocol signals input through the multi-pin socket into control signals of the LED display screen;
the nonvolatile storage circuit is used for storing configuration parameters and/or driving programs of the LED display screen through a memory device communicated with an SPI protocol;
the first power supply circuit, the HUB75 decoding circuit and the nonvolatile memory circuit are electrically connected with the multi-pin socket;
the second socket circuit is arranged on the decoding board and comprises a second power supply circuit, a HUB75 transcoding circuit, an SPI reading circuit and a multi-pin socket;
the second power supply circuit is used for accessing a power supply from an external circuit and converting the power supply into direct current output for driving the LED display screen;
the HUB75 transcoding circuit is used for converting the video signal input by the external circuit into a HUB75 protocol signal and outputting the HUB75 protocol signal to the multi-pin socket;
the SPI reading circuit is used for acquiring configuration parameters and/or driving programs of the LED display screen through an SPI protocol;
the second power supply circuit, the HUB75 transcoding circuit and the SPI reading circuit are electrically connected with the multi-pin socket;
at least twenty-two interface pins are arranged in the multi-pin socket, wherein at least two interface pins are used for supplying power, sixteen interface pins in the multi-pin socket are used for transmitting HUB75 protocol signals, and four interface pins in the multi-pin socket are used for transmitting SPI protocol signals;
the data line is two plugs connected through a wire, and the plugs are matched and connected with the multi-pin socket.
2. The LED display screen interface circuit of claim 1, wherein the first socket circuit further comprises an anti-reverse connection detection circuit, wherein the anti-reverse connection detection circuit is configured to connect and activate the first socket circuit to operate normally after detecting that the data line is properly connected.
3. The LED display screen interface circuit of claim 1, wherein twenty-eight interface pins are provided in the multi-pin socket, four of the interface pins are connected to the positive power supply, four of the interface pins are connected to the negative power supply, sixteen of the interface pins are used for transmitting HUB75 protocol signals, and four of the interface pins are used for transmitting SPI protocol signals.
4. The LED display screen interface circuit of claim 1, wherein a third socket circuit is further provided on the LED display screen, and the third socket circuit is used for switching the first socket circuit of another LED display screen.
5. The LED display screen interface circuit of claim 1, wherein a first filter module is disposed in the first power supply circuit, and a second filter module is disposed in the second power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321461191.2U CN220340891U (en) | 2023-06-08 | 2023-06-08 | LED display screen interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321461191.2U CN220340891U (en) | 2023-06-08 | 2023-06-08 | LED display screen interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220340891U true CN220340891U (en) | 2024-01-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321461191.2U Active CN220340891U (en) | 2023-06-08 | 2023-06-08 | LED display screen interface circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220340891U (en) |
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2023
- 2023-06-08 CN CN202321461191.2U patent/CN220340891U/en active Active
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