Multi-mode cascade circuit and cascade splicing screen

Abstract

The utility model discloses a multimode cascade circuit and a cascade splicing screen. The multimode cascade circuit comprises a main card cascade circuit and a plurality of auxiliary card cascade circuits; the main card cascade circuit and the plurality of auxiliary card cascade circuits are in cascade connection in sequence; main control chips, high-definition video transmission modules and optical fiber transmission modules are arranged in the main card cascade circuit and the auxiliary card cascade circuit, the main control chips are connected with the corresponding high-definition video transmission modules, the high-definition video transmission modules are connected with the corresponding optical fiber transmission modules, and the optical fiber transmission modules are connected with the corresponding display screens; the high-definition video transmission module is provided with a high-definition video signal interface, a high-definition video signal line can be inserted into the high-definition video signal interface, the optical fiber transmission module is provided with an optical fiber interface, and a connecting optical fiber can be inserted into the optical fiber interface. According to the utility model, the cascading screens are compatible with the high-definition video signal line and the optical fiber, and a user can select the cascading mode of the display screens according to actual application scenes so as to meet the requirements of different application scenes.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of video signal transmission, and in particular to a multi-mode cascade circuit and a cascade splicing screen. Background Art

[0002] At present, the cascaded splicing screen in the Light Emitting Diode (LED) industry mainly uses the High Definition Multimedia Interface (HDMI) interface for data transmission.

[0003] However, while the HDMI interface can meet the data transmission needs between cascaded splicing screens to a certain extent, the data transmission distance of HDMI cables is usually short and cannot meet the needs of long-distance data transmission. HDMI interfaces are also susceptible to external electromagnetic interference, which affects the stability of data transmission. In addition, HDMI cables are heavy and the wiring process is complicated, increasing the difficulty and cost of construction. Therefore, using HDMI cables to cascade splicing screens has many limitations in actual application scenarios. Utility Model Content

[0004] The utility model provides a multi-mode cascade circuit and a cascade splicing screen, which can realize cascade display screens through optical fibers, can meet the long-distance transmission of data, and has the characteristics of strong anti-interference ability, light weight and simple wiring. At the same time, it is compatible with high-definition video signal line cascade screens. Users can choose the cascade mode of display screens according to actual application scenarios.

[0005] In a first aspect, an embodiment of the present utility model provides a multi-mode cascade circuit, the circuit comprising a main card cascade circuit and a plurality of secondary card cascade circuits;

[0006] The main card cascade circuit and the plurality of secondary card cascade circuits are connected in cascade connection in sequence. The main card cascade circuit is connected to the first secondary card cascade circuit, and the first secondary card cascade circuit is connected to the remaining secondary card cascade circuits in cascade connection in sequence.

[0007] The main card cascade circuit and the secondary card cascade circuit are both equipped with a main control chip, a high-definition video transmission module and an optical fiber transmission module, and the main control chip is connected to the corresponding high-definition video transmission module, the high-definition video transmission module is connected to the corresponding optical fiber transmission module, and the optical fiber transmission module is connected to the corresponding display screen; the main control chip in the main card cascade circuit is used to transmit video data to the corresponding display screen and each of the secondary card cascade circuits;

[0008] The high-definition video transmission module is provided with a high-definition video signal interface, which can be inserted into a high-definition video signal line; the optical fiber transmission module is provided with an optical fiber interface, which can be inserted into a connecting optical fiber.

[0009] Furthermore, the high-definition video signal interface includes a high-definition video signal input end and a high-definition video signal output end, and the optical fiber interface includes an optical fiber input end and an optical fiber output end;

[0010] The high-definition video signal input end is used to connect to the output end of the high-definition video signal line, and the high-definition video signal output end is used to connect to the input end of the high-definition video signal line; the optical fiber input end is used to connect to the output end of the optical fiber, and the optical fiber output end is used to connect to the input end of the optical fiber.

[0011] Furthermore, the high-definition video transmission module includes a video interface chip and an image data chip;

[0012] The first input terminal of the video interface chip serves as the input terminal of the high-definition video transmission module, the second input terminal of the video interface chip serves as the high-definition video signal input terminal, and the output terminal of the video interface chip is connected to the input terminal of the image data chip;

[0013] The first output end of the image data chip serves as the output end of the high-definition video transmission module, and the second output end of the image data chip serves as the high-definition video signal output end.

[0014] Furthermore, the status terminal of the video interface chip is connected to the first status detection terminal of the main control chip;

[0015] The video interface chip is used to change the state of the video interface chip to an inserted state when a high-definition video signal line is inserted into the second input end of the video interface chip; the main control chip is used to detect the state of the video interface chip in real time and determine whether a high-definition video signal line is inserted into the second input end of the video interface chip.

[0016] Optionally, the status terminal of the video interface chip is connected to the first status detection terminal of the main control chip via an I2C bus.

[0017] Furthermore, the status end of the optical fiber transmission module is connected to the second status detection end of the main control chip;

[0018] The optical fiber transmission module is used to change the state of the optical fiber transmission module to an inserted state when an optical fiber is inserted into the optical fiber input end or the optical fiber output end; the main control chip is used to detect the state of the optical fiber transmission module in real time and determine whether there is an optical fiber inserted into the optical fiber input end or the optical fiber output end of the optical fiber transmission module.

[0019] Optionally, the status end of the optical fiber transmission module is connected to the second status detection end of the main control chip via a universal asynchronous receiver and transmitter.

[0020] Optionally, the transmission rate of the optical fiber input end and the optical fiber output end of the optical fiber transmission module is 10 Gbps.

[0021] Optionally, the optical fiber transmission module is a field programmable gate array.

[0022] In a second aspect, an embodiment of the present invention further provides a cascade splicing screen, which includes a plurality of display modules and the multi-mode cascade circuit described in any embodiment of the present invention.

[0023] The utility model provides a multi-mode cascade circuit and a cascade splicing screen. The multi-mode cascade circuit includes a main card cascade circuit and multiple secondary card cascade circuits. The main card cascade circuit and the multiple secondary card cascade circuits are sequentially cascaded, the main card cascade circuit is connected to the first secondary card cascade circuit, and the first secondary card cascade circuit is sequentially cascaded with the remaining secondary card cascade circuits. The main card cascade circuit and the secondary card cascade circuit are both provided with a main control chip, a high-definition video transmission module and an optical fiber transmission module, and the main control chip is connected to the corresponding high-definition video transmission module, and the high-definition video transmission module is connected to the corresponding optical fiber transmission module. The main card cascade circuit is connected to the main card, and the optical fiber transmission module is connected to the corresponding display screen; the main control chip in the main card cascade circuit is used to transmit video data to the corresponding display screen and each secondary card cascade circuit; the high-definition video transmission module is provided with a high-definition video signal interface, which can be inserted into the high-definition video signal line, and the optical fiber transmission module is provided with an optical fiber interface, which can be inserted into the connecting optical fiber, so as to be compatible with both high-definition video signal lines and optical fibers for cascading screens. Cascading display screens through optical fibers can meet the needs of long-distance data transmission and has strong anti-interference ability, light weight and simple wiring. The utility model can achieve simultaneous compatibility with both high-definition video signal lines and optical fibers for cascading screens. Users can choose the cascading method of display screens according to the actual application scenario to meet the needs of different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a multi-mode cascade circuit provided in an embodiment of the present utility model.

[0025] Figure 2 This is a structural diagram of the main card cascade circuit and the auxiliary card cascade circuit provided in an embodiment of the present utility model.

[0026] Figure 3 This is a structural diagram of another main card cascade circuit and a secondary card cascade circuit provided by an embodiment of the present utility model.

[0027] Figure 4 A schematic diagram of a data transmission link in a master card cascade circuit provided by an embodiment of the present utility model.

[0028] Figure 5 A schematic diagram of a data transmission link in a secondary card cascade circuit provided by an embodiment of the present utility model.

[0029] Figure 6 A schematic diagram of a data transmission link in another master card cascade circuit provided by an embodiment of the present utility model.

[0030] Figure 7 A schematic diagram of a data transmission link in another secondary card cascade circuit provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0032] In the prior art, HDMI is usually used to cascade splicing screens, but the use of HDMI cables will cause problems such as limited data transmission distance, weak anti-interference ability, and troublesome wiring, which has many limitations on actual application scenarios. In order to solve the problems in the prior art, the embodiment of the utility model provides a multi-mode cascade circuit. Figure 1 A schematic diagram of a multi-mode cascade circuit provided by an embodiment of the present utility model is shown in FIG. Figure 2 The schematic diagram of the structure of the main card cascade circuit and the auxiliary card cascade circuit provided in the embodiment of the present utility model is as follows: Figure 1 As shown, the circuit includes a main card cascade circuit and multiple secondary card cascade circuits. The main card cascade circuit and the multiple secondary card cascade circuits are connected in cascade sequence. The main card cascade circuit is connected to the first secondary card cascade circuit, and the first secondary card cascade circuit is connected to the remaining secondary card cascade circuits in cascade sequence.

[0033] like Figure 2As shown, the main card cascade circuit and the secondary card cascade circuit are both provided with a main control chip 110, a high-definition video transmission module 120 and a fiber optic transmission module 130, and the main control chip 110 is connected to the corresponding high-definition video transmission module 120, the high-definition video transmission module 120 is connected to the corresponding fiber optic transmission module 130, and the fiber optic transmission module 130 is connected to the corresponding display screen; the main control chip 110 in the main card cascade circuit is used to transmit video data to the corresponding display screen and each secondary card cascade circuit; the high-definition video transmission module 120 is provided with a high-definition video signal interface, the high-definition video signal interface can be inserted into the high-definition video signal line, and the fiber optic transmission module 130 is provided with a fiber optic interface, the fiber optic interface can be inserted into the connecting optical fiber.

[0034] The main card cascade circuit and the secondary card cascade circuit are both connected to corresponding display screens and can send video data to the display screens for display. The display screen in the embodiment of the present invention can be an LED display screen. The main card cascade circuit is the main card of the multi-mode cascade circuit and is responsible for receiving video data signals from the outside, processing and distributing this video data, acting as a data input and distribution center, and converting this video data into a format that can be recognized by the display screen for display. The secondary card cascade circuit is the secondary card of the multi-mode cascade circuit and is responsible for receiving video data distributed by the main card and converting this video data into a format that can be recognized by the display screen for display.

[0035] Specifically, such as Figure 1 As shown, the main card cascade circuit and multiple secondary card cascade circuits are connected in series through a video transmission line to form a cascade structure, so that the main card cascade circuit can send the received video data to the corresponding connected display screen and the secondary card cascade circuit, and the secondary card cascade circuit connected to the main card cascade circuit continues to send the video data to the corresponding connected display screen and the secondary card cascade circuit. For example, reference Figure 1 The main card cascade circuit can send the received video data to the corresponding connected display screen and the auxiliary card cascade circuit 1. The auxiliary card cascade circuit 1 sends the received video data to the corresponding connected display screen and the auxiliary card cascade circuit 2. And so on, until the last auxiliary card cascade circuit n sends the received video data to the corresponding connected display screen, thus completing the video data transmission between the main card cascade circuit and multiple auxiliary card cascade circuits. In addition, the main card cascade circuit can transmit the video data to each auxiliary card cascade circuit via a video transmission line. The video transmission line is one of a high-definition video signal line and an optical fiber. That is, the main card cascade circuit can transmit the video data to each auxiliary card cascade circuit via a high-definition video signal line or an optical fiber. It can achieve cascading screens compatible with both high-definition video signal lines and optical fibers. Users can choose the cascading method of the display screen according to the actual application scenario to meet the needs of different application scenarios.

[0036] like Figure 2 As shown, in an embodiment of the present utility model, a main control chip 110, a high-definition video transmission module 120 and a fiber optic transmission module 130 are provided in the main card cascade circuit and the secondary card cascade circuit. A main control chip 110, a high-definition video transmission module 120, a fiber optic transmission module 130 and a display screen are provided in the main card cascade circuit and the secondary card cascade circuit. The main control chip 110 in the main card cascade circuit can transmit the video data to the corresponding display screen and each secondary card cascade circuit through the corresponding high-definition video transmission module 120 or the fiber optic transmission module 130. The high-definition video transmission module 120 is used to connect the high-definition video signal line. The high-definition video transmission module 120 is provided with a high-definition video signal interface, which can be inserted into the high-definition video signal line. The optical fiber transmission module 130 is used to connect the optical fiber. The optical fiber transmission module 130 is provided with an optical fiber interface, which can be inserted into the connecting optical fiber, thereby realizing the connection between the main card cascade circuit and multiple secondary card cascade circuits through high-definition video signal lines or optical fibers. For example, the main card cascade circuit and one secondary card cascade circuit are connected through high-definition video signal lines or optical fibers, a part of the secondary card cascade circuits use high-definition video signal lines, and the other part of the secondary card cascade circuits use optical fibers for connection, or all secondary card cascade circuits are connected by high-definition video signal lines, or all secondary card cascade circuits are connected by optical fibers, so that users can choose the cascade method of the display screen according to the actual application scenario to meet the needs of different application scenarios. And when the main card cascade circuit and multiple sub-card cascade circuits are realized through optical fiber, that is, the display screen is cascaded through optical fiber, it can meet the long-distance transmission of data, has the characteristics of strong anti-interference ability, light weight and simple wiring, and overcomes the problems of limited data transmission distance, weak anti-interference ability and troublesome wiring caused by using HDMI cables.

[0037] It should be noted that the specific structures of the main card cascade circuit and the secondary card cascade circuit in the embodiment of the present invention are the same. Therefore, the secondary card cascade circuit can also be used as the main card cascade circuit, and the main card cascade circuit can also be used as the secondary card cascade circuit, thereby making the cascade method of the display screen more flexible to meet the needs of complex application scenarios.

[0038] The embodiment of the utility model provides a multi-mode cascade circuit, which includes a main card cascade circuit and multiple auxiliary card cascade circuits;

[0039] The main card cascade circuit and multiple secondary card cascade circuits are cascaded in sequence, the main card cascade circuit is connected to the first secondary card cascade circuit, and the first secondary card cascade circuit is cascaded with the remaining secondary card cascade circuits in sequence; the main card cascade circuit and the secondary card cascade circuit are both provided with a main control chip, a high-definition video transmission module and a fiber optic transmission module, and the main control chip is connected to the corresponding high-definition video transmission module, the high-definition video transmission module is connected to the corresponding fiber optic transmission module, and the fiber optic transmission module is connected to the corresponding display screen; the main control chip in the main card cascade circuit is used to transmit video data to the corresponding display screen and each secondary card cascade circuit; the high-definition video transmission module is provided with a high-definition video signal interface, which can be inserted into a high-definition video signal line, and the fiber optic transmission module is provided with a fiber optic interface, which can be inserted into the connecting optical fiber, so as to cascade the screen in a compatible manner of both high-definition video signal line and optical fiber, and cascade display screens are realized through optical fiber, which can meet the long-distance transmission of data and has the characteristics of strong anti-interference ability, light weight and simple wiring. The utility model can realize cascading screens in two ways, namely, high-definition video signal lines and optical fibers. Users can choose the cascading method of the display screen according to the actual application scenario to meet the needs of different application scenarios.

[0040] For further reference, Figure 2 The high-definition video signal interface includes the high-definition video signal input terminal HDMI-IN and the high-definition video signal output terminal HDMI-OUT, and the optical fiber interface includes the optical fiber input terminal SPF+IN and the optical fiber output terminal SPF+OUT; the high-definition video signal input terminal HDMI-IN is used to connect to the output end of the high-definition video signal line, and the high-definition video signal output terminal HDMI-OUT is used to connect to the input end of the high-definition video signal line; the optical fiber input terminal SPF+IN is used to connect to the output end of the optical fiber, and the optical fiber output terminal SPF+OUT is used to connect to the input end of the optical fiber.

[0041] Specifically, the HD video signal input terminal HDMI-IN of the HD video transmission module 120 is connected to the output terminal of the HD video signal line, and the HD video signal output terminal HDMI-OUT of the HD video transmission module 120 is connected to the input terminal of the HD video signal line. This allows communication between the main card cascade circuit and the secondary card cascade circuit via the HD video signal line, and between the secondary card cascade circuit and the secondary card cascade circuit via the HD video signal line. The optical fiber input terminal SPF+IN of the optical fiber transmission module 130 is used to connect to the output terminal of the optical fiber, and the optical fiber output terminal SPF+OUT of the optical fiber transmission module 130 is used to connect to the input terminal of the optical fiber. This allows communication between the main card cascade circuit and the secondary card cascade circuit via the optical fiber, and between the secondary card cascade circuit and the secondary card cascade circuit via the optical fiber. It should be noted that between the card cascade circuit and the secondary card cascade circuit, and between the secondary card cascade circuit and the secondary card cascade circuit, optical fiber transmission and HD video signal line transmission can only be selected as one, and cannot be carried out simultaneously.

[0042] Further, Figure 3 This is a structural diagram of another main card cascade circuit and a secondary card cascade circuit provided by an embodiment of the present utility model. The high-definition video transmission module 120 includes a video interface chip 1201 and an image data chip 1202.

[0043] The first input end of the video interface chip 1201 serves as the input end of the high-definition video transmission module 120 , the second input end of the video interface chip 1201 serves as the high-definition video signal input end HDMI-IN, and the output end of the video interface chip 1201 is connected to the input end of the image data chip 1202 .

[0044] The first output terminal of the image data chip 1202 serves as the output terminal of the high-definition video transmission module 120 , and the second output terminal of the image data chip 1202 serves as the high-definition video signal output terminal HDMI-OUT.

[0045] The video interface chip 1201 can be an HDMI two-input and one-output selection chip that can receive video data signals transmitted by high-definition video signals. The image data chip 1202 can be an HDMI to RGB image data chip, and it also has an HDMI loop-out interface as the high-definition video signal output terminal HDMI-OUT. It can convert the video data signals transmitted by the high-definition video signal into RGB image data. The image data is transmitted to the display screen via the optical fiber transmission module 130 through the first output terminal of the image data chip 1202 to display the image. At the same time, the video data signal is transmitted to the video interface chip 1201 in the high-definition video transmission module 120 of the next-level secondary card cascade circuit through the high-definition video signal output terminal HDMI-OUT.

[0046] Furthermore, the status end of the video interface chip 1201 is connected to the first status detection end of the main control chip 110; the video interface chip 1201 is used to change the status of the video interface chip 1201 to an inserted state when the high-definition video signal line is inserted into the second input end of the video interface chip; the main control chip 110 is used to detect the status of the video interface chip 1201 in real time and determine whether a high-definition video signal line is inserted into the second input end of the video interface chip 1201.

[0047] Specifically, when the high-definition video signal line is inserted into the second input end of the video interface chip 1201, the state of the register in the video interface chip 1201 will change, and the state changes to the insertion state. The main control chip 110 detects the state of the video interface chip 1201 in real time, and determines whether there is a high-definition video signal line inserted into the second input end of the video interface chip 1201, thereby determining whether the user uses the cascade method of high-definition video signal lines to transmit data.

[0048] Optionally, the status terminal of the video interface chip 1201 is connected to the first status detection terminal of the main control chip 110 via an I2C bus.

[0049] The Inter-Integrated Circuit (I2C) bus is a widely used inter-chip serial expansion bus that can be used for communication between microcontrollers and peripheral devices. The video interface chip 1201 is connected to the main control chip 110 via the I2C bus, allowing the main control chip 110 to determine whether the user is using a cascaded high-definition video signal line to transmit data.

[0050] Optionally, the optical fiber transmission module 130 is a field programmable gate array.

[0051] The characteristic of a Field-Programmable Gate Array (FPGA) is its programmability. Users can program the FPGA according to their needs using specific software tools to implement the desired circuit functions. In an embodiment of the present invention, the FPGA can be an RGB image processing chip, so that the optical fiber transmission module 130 can convert the video data signal input by the main control chip 110 or the video data signal transmitted by the optical fiber input terminal SPF+IN into RGB image data, transmit the received image data to the display screen through the output terminal of the optical fiber transmission module 130 to display the image, and simultaneously transmit the video data signal through the optical fiber output terminal SPF+OUT to the optical fiber transmission module 130 of the next-level secondary card cascade circuit.

[0052] For further reference, Figure 3The status end of the optical fiber transmission module 130 is connected to the second status detection end of the main control chip 110; the optical fiber transmission module 130 is used to change the status of the optical fiber transmission module 130 to the inserted state when the optical fiber is inserted into the optical fiber input end SPF+IN or the optical fiber output end SPF+OUT; the main control chip 110 is used to detect the status of the optical fiber transmission module 130 in real time and determine whether there is an optical fiber inserted into the optical fiber input end SPF+IN or the optical fiber output end SPF+OUT of the optical fiber transmission module 130.

[0053] Specifically, when an external optical fiber is inserted into the optical fiber input end or optical fiber output end of the video optical fiber transmission module 130, the state of the register in the optical fiber transmission module 130 will change, and the state changes to the insertion state. The main control chip 110 detects the state of the optical fiber transmission module 130 in real time, and determines whether there is an optical fiber inserted into the optical fiber input end SPF+IN or the optical fiber output end SPF+OUT of the optical fiber transmission module 130, thereby determining whether the user uses the cascade method of optical fiber cascading to transmit data.

[0054] Optionally, the status end of the optical fiber transmission module 130 is connected to the second status detection end of the main control chip 110 via a universal asynchronous receiver / transmitter.

[0055] Among them, the Universal Asynchronous Receiver / Transmitter (UART) is a serial, asynchronous, full-duplex communication protocol. The status end of the optical fiber transmission module 130 and the second status detection end of the main control chip 110 are connected via the universal asynchronous receiver / transmitter. The main control chip 110 uses the UART to detect the status of the optical fiber transmission module 130 in real time and determine whether an optical fiber is inserted into the optical fiber input end or the optical fiber output end of the optical fiber transmission module 130.

[0056] Optionally, the transmission rate of the optical fiber input terminal SPF+IN and the optical fiber output terminal SPF+OUT of the optical fiber transmission module 130 is 10 Gbps.

[0057] Figure 4 This is a schematic diagram of a data transmission link in a master card cascade circuit provided by an embodiment of the present utility model. Figure 5 This is a schematic diagram of a data transmission link in a secondary card cascade circuit provided by an embodiment of the present invention. It should be noted that when the main card cascade circuit and multiple secondary card cascade circuits are cascaded via optical fibers in the embodiment of the present invention, the data transmission path between the main card cascade circuit and multiple secondary card cascade circuits is as follows: Figure 4 and Figure 5As shown, after the main control chip 110 in the main card cascade circuit receives the video data, the video data is sequentially transmitted to the display screen through the main control chip 110, the video interface chip 1201, the image data chip 1202, and the data transmission link of the optical fiber transmission module 130, and the video data is output to the optical fiber output terminal SPF+IN of the optical fiber transmission module 130 in the auxiliary card cascade circuit through the optical fiber output terminal SPF+OUT of the optical fiber transmission module 130. Figure 5 As shown, after the optical fiber output terminal SPF+IN of the optical fiber transmission module 130 in the secondary card cascade circuit receives the video data, it is transmitted to the display screen through the output terminal of the optical fiber transmission module 130, and then output to the optical fiber output terminal SPF+IN of the optical fiber transmission module 130 in the next secondary card cascade circuit through the optical fiber output terminal SPF+OUT of the optical fiber transmission module 130, until the optical fiber output terminal SPF+IN of the optical fiber transmission module 130 in the last secondary card cascade circuit is not connected to the secondary card cascade circuit. Through the above data transmission process, it is possible to achieve long-distance data transmission by cascading display screens via optical fiber. Optical fiber cascading has the characteristics of strong anti-interference ability, light weight and simple wiring. It overcomes the problems of limited data transmission distance, weak anti-interference ability and complicated wiring caused by using HDMI cables. Users can choose the cascading method of display screens according to the actual application scenario to meet the needs of different application scenarios.

[0058] Figure 6 This is a schematic diagram of a data transmission link in another master card cascade circuit provided by an embodiment of the present utility model. Figure 7 This is a schematic diagram of another data transmission link in a secondary card cascade circuit provided by an embodiment of the present invention. It should be noted that when the main card cascade circuit and multiple secondary card cascade circuits are cascaded via a high-definition video signal line in the embodiment of the present invention, the data transmission path between the main card cascade circuit and multiple secondary card cascade circuits is as follows: Figure 6 and Figure 7 As shown, after the main control chip 110 in the main card cascade circuit receives the video data, the video data is transmitted to the display screen through the data transmission link of the main control chip 110, the video interface chip 1201, the image data chip 1202, and the optical fiber transmission module 130 in sequence, and the video data is output to the high-definition video signal input terminal HDMI-IN of the video interface chip 1201 in the auxiliary card cascade circuit through the high-definition video signal output terminal HDMI-OUT of the image data chip 1202. Figure 7As shown, after the high-definition video signal input terminal HDMI-IN of the video interface chip 1201 in the secondary card cascade circuit receives video data, the video data is transmitted to the display screen through the data transmission link of the video interface chip 1201, the image data chip 1202, and the optical fiber transmission module 130. The video data is then output to the high-definition video signal input terminal HDMI-IN of the video interface chip 1201 in the secondary card cascade circuit through the high-definition video signal output terminal HDMI-OUT of the image data chip 1202, until the high-definition video signal output terminal HDMI-OUT of the image data chip 1202 in the last secondary card cascade circuit is disconnected from the secondary card cascade circuit. Through the above data transmission process, the display screen can be cascaded using the high-definition video signal line, and the screen can be cascaded using both high-definition video signal lines and optical fibers. Users can select the display screen cascade method according to the actual application scenario to meet the needs of different application scenarios, thereby making the display screen cascade method more flexible and meeting the needs of complex application scenarios.

[0059] In addition, in the multi-mode cascade circuit in the embodiment of the present invention, although the main control chip 110 in the secondary card cascade circuit is not used during the data transmission process of the multi-mode cascade circuit, the main control chip 110 in the secondary card cascade circuit can provide a redundant structure for the multi-mode cascade circuit in the embodiment of the present invention, so that the specific structures of the main card cascade circuit and the secondary card cascade circuit are the same. Therefore, in some special application scenarios, the secondary card cascade circuit can also be used as the main card cascade circuit, and the main card cascade circuit can also be used as the secondary card cascade circuit, thereby making the cascade mode of the display screen more flexible to meet the needs of complex application scenarios.

[0060] The embodiment of the present invention provides a multi-mode cascade circuit, which realizes cascading display screens through optical fibers, can meet the needs of long-distance data transmission, and has the characteristics of strong anti-interference ability, light weight and simple wiring. The multi-mode cascade circuit in the present invention can achieve simultaneous compatibility with high-definition video signal lines and optical fibers for cascading screens. Users can choose the cascading method of display screens according to actual application scenarios to meet the needs of different application scenarios.

[0061] On the second aspect, the embodiment of the present invention also provides a cascade splicing screen, which includes multiple display modules and the multi-mode cascade circuit in any embodiment of the present invention, thereby realizing the function and technical effect of the multi-mode cascade circuit in the above embodiment.

[0062] In an embodiment of the present invention, the cascaded splicing screen includes multiple display modules and a multi-mode cascade circuit in any embodiment of the present invention. Multiple display modules can be cascaded using the multi-mode cascade circuit in any embodiment of the present invention, thereby realizing cascading between multiple display modules using optical fibers. Optical fibers can be transmitted over long distances, have strong anti-interference capabilities, are light in weight, and have simple wiring. At the same time, multiple display modules are compatible with HDMI cascade methods. Users can choose the cascade method according to the actual application scenario to meet the needs of complex application scenarios.

[0063] Note that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are readily apparent to those skilled in the art without departing from the scope of protection of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the appended claims.

Claims

1. A multi-mode cascade circuit, characterized in that: The circuit includes a main card cascade circuit and multiple auxiliary card cascade circuits; The main card cascade circuit and the plurality of secondary card cascade circuits are connected in cascade connection in sequence. The main card cascade circuit is connected to the first secondary card cascade circuit, and the first secondary card cascade circuit is connected to the remaining secondary card cascade circuits in cascade connection in sequence. The main card cascade circuit and the secondary card cascade circuit are both equipped with a main control chip, a high-definition video transmission module and an optical fiber transmission module, and the main control chip is connected to the corresponding high-definition video transmission module, the high-definition video transmission module is connected to the corresponding optical fiber transmission module, and the optical fiber transmission module is connected to the corresponding display screen; the main control chip in the main card cascade circuit is used to transmit video data to the corresponding display screen and each of the secondary card cascade circuits; The high-definition video transmission module is provided with a high-definition video signal interface, which can be inserted into a high-definition video signal line; the optical fiber transmission module is provided with an optical fiber interface, which can be inserted into a connecting optical fiber.

2. The multi-mode cascade circuit according to claim 1, characterized in that: The high-definition video signal interface includes a high-definition video signal input end and a high-definition video signal output end, and the optical fiber interface includes an optical fiber input end and an optical fiber output end; The high-definition video signal input end is used to connect to the output end of the high-definition video signal line, and the high-definition video signal output end is used to connect to the input end of the high-definition video signal line; the optical fiber input end is used to connect to the output end of the optical fiber, and the optical fiber output end is used to connect to the input end of the optical fiber.

3. The multi-mode cascade circuit according to claim 2, characterized in that: The high-definition video transmission module includes a video interface chip and an image data chip; The first input terminal of the video interface chip serves as the input terminal of the high-definition video transmission module, the second input terminal of the video interface chip serves as the high-definition video signal input terminal, and the output terminal of the video interface chip is connected to the input terminal of the image data chip; The first output end of the image data chip serves as the output end of the high-definition video transmission module, and the second output end of the image data chip serves as the high-definition video signal output end.

4. The multi-mode cascade circuit according to claim 3, characterized in that: The status terminal of the video interface chip is connected to the first status detection terminal of the main control chip; The video interface chip is used to change the state of the video interface chip to an inserted state when a high-definition video signal line is inserted into the second input end of the video interface chip; the main control chip is used to detect the state of the video interface chip in real time and determine whether a high-definition video signal line is inserted into the second input end of the video interface chip.

5. The multi-mode cascade circuit according to claim 4, characterized in that: The status terminal of the video interface chip is connected to the first status detection terminal of the main control chip via an I2C bus.

6. The multi-mode cascade circuit according to claim 2, characterized in that: The status end of the optical fiber transmission module is connected to the second status detection end of the main control chip; The optical fiber transmission module is used to change the state of the optical fiber transmission module to an inserted state when an optical fiber is inserted into the optical fiber input end or the optical fiber output end; the main control chip is used to detect the state of the optical fiber transmission module in real time and determine whether there is an optical fiber inserted into the optical fiber input end or the optical fiber output end of the optical fiber transmission module.

7. The multi-mode cascade circuit according to claim 6, characterized in that: The status end of the optical fiber transmission module is connected to the second status detection end of the main control chip via a universal asynchronous receiver and transmitter.

8. The multi-mode cascade circuit according to claim 2, characterized in that: The transmission rate of the optical fiber input end and the optical fiber output end of the optical fiber transmission module is 10Gbps.

9. The multi-mode cascade circuit according to claim 1, characterized in that: The optical fiber transmission module is a field programmable gate array.

10. A cascade splicing screen, characterized in that: The cascaded splicing screen includes multiple display modules and the multi-mode cascade circuit according to any one of claims 1 to 9.

Images