Vehicle-mounted video signal transmission system

Abstract

The present application discloses a vehicle-mounted video signal transmission system for transmitting video signals to at least two display screens, including a video source module, a split-screen processing module, an optical transmitting module, an optical receiving module and an electrical signal transmission module. The video signal output by the video source module is converted by the split-screen processing module into at least two groups of video streams, including a first video stream and a second video stream. The video streams are converted into optical signals by the optical transmitting module and transmitted through optical fibers. The optical receiving module receives the optical signals and converts them into video streams. The control signals for interaction between the video source module and the display screens are transmitted by the electrical signal transmission module. The control signals include a first electrical signal and a second electrical signal. The first electrical signal is associated with the first video stream, and the second electrical signal is associated with the second video stream. The first video stream is transmitted to one of the at least two display screens for display, and the second video stream is transmitted to the other of the at least two display screens for display.

Description

Technical Field

[0001] The present invention relates to the field of digital communication technology, and in particular to a vehicle-mounted video signal transmission system. Background Art

[0002] Among the signal transmission technologies used for in-vehicle displays, interface protocols for transmitting video signals include LVDS (low-voltage differential signaling), OLDI (open LVDS display interface), and DP (display port). Typical transmission architectures use a serializer-deserializer (SERD) to convert parallel signals into serial signals for transmission. FPD-Link (FPD-Link), a proprietary transmission architecture protocol with a maximum dual-channel rate of 27 Gbps, enjoys widespread industry adoption and a dominant position. However, with the increasing adoption of high-definition screens in vehicles, the bandwidth of this protocol's current SERD solution is becoming insufficient.

[0003] Currently, optical modules offer excellent performance in data transmission bandwidth, significantly improving the rate and quality of in-vehicle data transmission. However, the signal output by a single DP port on a conventional SoC (system on chip) contains two or more video streams. To accommodate the higher video transmission speed and quality requirements, as well as the need for high-quality multi-screen displays, a new video signal transmission system is needed. Summary of the Invention

[0004] The present invention provides a vehicle-mounted video signal transmission system, aiming to solve the problem of insufficient transmission bandwidth in the prior art.

[0005] The present invention provides a vehicle-mounted video signal transmission system for transmitting a video signal to at least two display screens, comprising:

[0006] A video source module is used to output video signals and interact with at least two display screens to control signals;

[0007] a split-screen processing module, configured to receive a video signal output by the video source module and a control signal for interacting with the video source module, wherein the video signal is converted into at least two video streams, including a first video stream and a second video stream, and the control signal includes a first electrical signal and a second electrical signal, wherein the first electrical signal is associated with the first video stream and the second electrical signal is associated with the second video stream;

[0008] An optical sending module, configured to convert the first video stream and the second video stream output by the split-screen processing module into optical signals and transmit them through optical fibers;

[0009] An optical receiving module, configured to receive an optical signal from an optical fiber and convert the received optical signal into a first video stream and a second video stream;

[0010] An electrical signal transmission module, configured to transmit the first electrical signal and the second electrical signal to the display screen via a cable, or to transmit the first electrical signal and the second electrical signal output by the display screen to the split-screen processing module via a cable;

[0011] The first video stream is transmitted to one of the at least two display screens for display, and the second video stream is transmitted to the other one of the at least two display screens for display.

[0012] The vehicle-mounted video signal transmission system of the present application can at least achieve the following technical effects: a split-screen processing module is used to divert the video signal and then perform photoelectric conversion, and optical signals can be used to transmit multi-stream video signals to increase the video transmission bandwidth; low-speed control signals are transmitted through cables to facilitate communication between screens with the same bus address and SoC (system on chip). BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0014] Figure 1 A schematic diagram of a vehicle-mounted video signal transmission system provided in a first embodiment of the present application is provided;

[0015] Figure 2 A schematic diagram of a vehicle-mounted video signal transmission system provided in a second embodiment of the present application is provided;

[0016] Figure 3 A schematic diagram of an electrical signal is given;

[0017] Figure 4 Another electrical signal schematic is given;

[0018] Figure 5 A schematic diagram of a split-screen processing module 200 is provided;

[0019] Figure 6 A schematic diagram of a vehicle video signal transmission system provided in accordance with a third embodiment of the present application is given;

[0020] Figure 7 A schematic diagram of a first package provided by the present application is given;

[0021] Figure 8 A schematic diagram of a second package provided by the present application is given;

[0022] Figure 9 A schematic diagram of a third package provided by this application is given. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the term "and / or" herein is merely a description of an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " herein, unless otherwise specified, generally indicates that the associated objects are in an "or" relationship.

[0025] It should be understood that in the following description, "circuit" refers to a conductive loop composed of at least one element or subcircuit connected electrically or electromagnetically. When an element or circuit is said to be "connected to" another element, an element or circuit is "connected" to another element, or an element / circuit is said to be "connected" between two nodes, it can be directly coupled or connected to the other element or there can be intervening elements. The connection between the elements can be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there are no intervening elements between the two elements.

[0026] The terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0027] The present application provides a vehicle-mounted video signal transmission system for transmitting a video signal to at least two display screens. The video signal is output by a video source module 100, and after being processed by a split-screen processing module 200, at least two video streams are formed and converted into optical signals for transmission. The split-screen processing module 200 and the optical transmitting module 300 transmit the video stream in the form of an AC signal and perform AC coupling, so that the video stream output by the split-screen processing module 200 can directly drive the optical transmitting module 300 without the need for electrical signal modulation. After the optical transmitting module 300 transmits the optical signal to the optical receiving module 400 via an optical fiber, the optical receiving module 400 converts the optical signal into a video stream and transmits it to at least two display screens for display. This system transmits the video stream via an optical module, thereby improving the transmission speed of the vehicle-mounted video signal to meet the requirements of high-definition display. The above-mentioned system also includes an electrical signal transmission module 500, which is used for the video source module 100 to interact with at least two display screens to control the signal. The electrical signal transmission module 500 transmits the electrical signal via a cable. The vehicle-mounted video signal transmission system provided in this application is suitable for scenarios with multiple vehicle-mounted display screens and multi-screen display and operation requirements.

[0028] Figure 1 A schematic diagram of the vehicle-mounted video signal transmission system provided by the first embodiment of the present application is given. Figure 1 As shown, the video source module 100 outputs a video signal to the split-screen processing module 200. After receiving the video signal output by the video source module 100, the split-screen processing module 200 converts the video signal into at least two video streams, including a first video stream and a second video stream. The video source module 100 also exchanges control signals with the split-screen processing module 200. Control signals are transmitted between the split-screen processing module 200 and the display screen group 700 via the electrical signal transmission module 500. The transmitted control signals include at least a first electrical signal and a second electrical signal, wherein the first electrical signal is associated with the first video stream and the second electrical signal is associated with the second video stream. The optical transmission module 300 is used to convert the at least two video streams output by the split-screen processing module 200 into optical signals and transmit them via optical fiber. The optical receiving module 400 is used to receive the optical signals in the optical fiber and convert the received optical signals into video streams. The electrical signal transmission module 500 is used to transmit the control signals to the display screen group 700 via a cable, or to transmit the control signals output by the display screen group 700 to the split-screen processing module 200 via a cable. Display screen assembly 700 includes n display screens, where n is a natural number greater than or equal to 2. In this embodiment, the signal transmission channel between the video source module 100 and the display screen assembly 700 is a hybrid optical fiber and cable transmission link. The video signal is transmitted at high speed in the form of an optical signal, thereby increasing the data transmission bandwidth of the entire in-vehicle video signal transmission system. Furthermore, optical fiber transmission improves the system's anti-interference performance. The control signal is a low-speed electrical signal transmitted via the cable link.

[0029] Figure 2 A schematic diagram of a vehicle-mounted video signal transmission system provided in the second embodiment of the present application is given. Figure 2 As shown, this embodiment has the same transmission system architecture as the first embodiment, but only includes two display screens, namely a first display screen 701 and a second display screen 702. In some embodiments, the first display screen 701 uses a high-definition display screen with a pixel level of 2880×1800 to meet high-definition display requirements, and the second display screen uses a display screen with a pixel level of 1440×480 to reduce the cost of the multi-screen system. After receiving the video signal output by the video source module 100, the split-screen processing module 200 outputs a first video stream and a second video stream. The control signal for the interaction between the video source module 100 and the split-screen processing module 200 also only includes a first electrical signal and a second electrical signal, wherein the first electrical signal is associated with the first video stream to control the first display screen 701 or feedback the status of the first display screen 701, and the second electrical signal is associated with the second video stream to control the second display screen 702 or feedback the status of the second display screen 702.

[0030] In some embodiments, the split-screen processing module 200 is further configured to separate an audio signal from a video signal, and the audio signal is transmitted to at least two display screens via the electrical signal transmission module 500 .

[0031] Specifically, Figure 3 A schematic diagram of an electrical signal is given. Figure 3 As shown, the first electrical signal includes a first address signal, a first configuration signal and a first control signal. The second electrical signal includes a second address signal, a second configuration signal and a second control signal. Figure 2 and Figure 3 , wherein the first address signal and the second address signal are transmitted via at least two communication ports. The first address signal and the second address signal respectively represent the communication port address corresponding to the first display screen 701 and the communication port address corresponding to the second display screen 702. The first address signal and the second address signal are transmitted to the video source module 100 via the same bus. The first configuration signal and the second configuration signal respectively represent the configuration data of the first display screen 701 and the configuration data of the second display screen 702. The first control signal represents the command data output by the video source module 100 to the first display screen 701 or the event data generated by the first display screen 701. The second control signal represents the command data output by the video source module 100 to the second display screen 702 or the event data generated by the second display screen 702.

[0032] Figure 4 Another electrical signal diagram is given. Figure 4 As shown in the above Figure 3Based on the electrical signal shown, the split-screen processing module 200 also separates the first audio signal and the second audio signal from the video signal, and includes them in the first electrical signal and the second electrical signal respectively, for adapting the first video stream and the second video stream respectively.

[0033] To illustrate the transmission paths of the video stream and control signal in the above embodiments, this application provides an exemplary split-screen processing module. Figure 5 A schematic diagram of a split screen processing module 200 is provided. Figure 5 As shown, the split-screen processing module 200 includes at least a video stream processing unit 201, a bus control unit 202, and a microcontroller unit 203. The video stream processing unit 201 is configured to convert the video signal into at least two video streams, including a first video stream and a second video stream, and transmit the configuration data of at least two display screens to the video source module 100 via control signals. The at least two video streams output by the video stream processing unit 201 are both AC-coupled electrical signals, and the signal amplitudes are both greater than 200 mV, meeting the electrical signal amplitude requirements for directly driving the optical transmitter module 300. The bus control unit 202 has at least two communication ports, which are allocated to at least two display screens. The at least two communication ports are configured to the same bus address, allowing all display screens to exchange control signals with the video source module 100 via the same bus address. The microcontroller unit 203 is configured to transmit command data output by the video source module 100 to the at least two display screens via control signals, or to transmit event data generated by the at least two display screens to the video source module 100 via control signals. The instruction data or event data may include an interrupt notification or instruction INT, a reset request RET, a power-down operation PWDN, a ground detection GND, and the like.

[0034] Combine Figure 5 and Figure 2 In a second embodiment, as shown in the transmission system of the split-screen processing module 200 of this embodiment, the first configuration data in the video stream processing unit 201 corresponds to the EDID (Extended Display Identification Data) of the first display screen 701, and the second configuration data corresponds to the EDID of the second display screen 702. EDID usually contains various information of the display device, such as product type, supported resolution and refresh rate, color characteristics, size and brightness data, etc. The first address in the bus control unit 202 corresponds to the address data of the first display screen 701, and the bus control unit 202 allocates a communication port for transmitting the address data of the first display screen 701. The second address corresponds to the address data of the second display screen 702, and the bus control unit 202 allocates another communication port for transmitting the address data of the second display screen 702. The bus control unit 202 and the video source module 100 communicate only through one bus address. For example, in I2 In a C-bus architecture, the video source module 100 acts as the master and all display screens act as slaves, thereby reducing bus communication costs. The first command / event data in the microcontroller unit 203 corresponds to command data transmitted by the video source module 100 to the first display screen 701 or event data generated by the first display screen 701, such as an interrupt command or reset request, to control the interruption or reset of the first display screen 701. The second command / event data corresponds to command data transmitted by the video source module 100 to the second display screen 702 or event data generated by the second display screen 702.

[0035] Specifically, in some embodiments, the bus control unit 202 is I 2 C switch chip, having at least two communication ports and one bus port. At least two display screens are connected to the at least two communication ports respectively. When at least two display screens interact with the video source module 100 for control signals, I 2 The C switch chip opens the communication port corresponding to the display screen that is interacting with the control signal and closes the communication port corresponding to the display screen in the non-interactive state according to the interactive state of at least two display screens. 2 The C switch chip ensures that the control signals exchanged between the bus port and the video source module 100 correctly control the display screen or accurately reflect the display screen's status by controlling the opening and closing of the communication port. Furthermore, in some embodiments, the microcontroller unit 203 is further configured to control the video stream processing unit 201 to adjust the operating parameters of the optical transmitter module 300, or to directly adjust the operating parameters of the optical transmitter module 300. For example, the microcontroller unit 203 may activate the firmware of the optical transmitter module 300 and automatically adjust the power of the optical transmitter module 300 using a temperature compensation table to ensure stable operating temperature.

[0036] Figure 6 A schematic diagram of a vehicle-mounted video signal transmission system provided in the third embodiment of the present application is given. Figure 6 As shown, in this embodiment, the optical receiving module 400 further includes an interface conversion unit 410 for converting the first video stream and / or the second video stream output by the optical receiving module 400 into a format adapted to the display screen configuration data.

[0037] In order to explain in detail the packaging structure of various vehicle-mounted video signal transmission systems provided in this application, this specification also provides an exemplary packaging solution to implement the system architecture provided in this application. Figures 7 to 9 Schematic diagram of the packaging solution provided for this application. Figures 7 to 9The optical transmission module 300 includes at least a first optical transmission module 301 that converts the first video stream into an optical signal, and a second optical transmission module 302 that converts the second video stream into an optical signal. The split-screen processing module 200 and the optical transmission module 300 are packaged together to form a first package 810. The optical receiving module 400 includes a first optical receiving module 401 that converts the received optical signal into the first video stream, and a second optical receiving module 402 that converts the received optical signal into the second video stream. The electrical signal transmission module 500 includes a first electrical transmission module that transmits the first electrical signal, and a second electrical transmission module that transmits the second electrical signal. The first electrical transmission module includes a first cable, a first connector 801 connected to both ends of the first cable, and a second connector 802 for outputting the first video stream to a display screen. The second electrical transmission module includes a second cable, a first connector 801 connected to both ends of the second cable, and a second connector 802 for outputting the second video stream to a display screen. The first optical receiving module 401 and the second connector 802 in the first electrical transmission module are packaged together to form a second package 820. The second optical receiving module 402 and the second connector in the second electrical transmission module 502 are packaged together to form a third package 830. The first cable and the first connectors at both ends are used to transmit electrical signals between the first package 810 and the second package 820, and the second cable and the first connectors at both ends are used to transmit electrical signals between the first package 810 and the third package 830. Both the optical transmitting module 300 and the optical receiving module 400 use automotive-grade optical modules, such as those that meet ISO 26262, the safety standards and specifications for the automotive electronics industry. The first package 810 and the second package 820, as well as the first package 810 and the third package 830, are connected via optical fibers and pluggable optical connectors. The power required for the second package 820 and the third package 830 is provided by the display screen.

[0038] Figure 7 A schematic diagram of a first package provided by this application is given. Figure 7As shown, the first package 810 includes a split-screen processing module 200, a first optical transmitter module 301, a second optical transmitter module 302, and two first connectors 801. The split-screen processing module 200 uses an MST controller (multi-stream controller) as the video stream processing unit 201. It uses an 8-channel eDP+ / - (Embedded DisplayPort) channel to receive the video signal output by the video source module 100 and uses two 4-channel eDP+ / - transmission channels to output the first and second video streams, respectively. The first and second optical transmitter modules 301 and 302 both use 4x16G Tx optical modules, including a driver for receiving the video stream and a VCSEL laser for transmitting the optical signal. The optical signals emitted by the first and second optical transmitter modules 301 and 302 are transmitted to optical fibers via a fiber optic connector (Pigtail). In this embodiment, the optical fibers use MMF (Multimode Fiber) with a transmission distance of up to 100 meters. The split-screen processing module 200 also uses an MCU and an I2C switch chip as a microcontroller unit 203 and a bus control unit 202, respectively, to transmit data such as INT / RET / PWDN / GND and the I2C communication port for controlling the display screen. In addition, the split-screen processing unit also transmits auxiliary AUX+ / - signals and hot-swap HPD signals through the MST Controller. The first connector 801 is used to summarize and arrange the electrical signal interfaces between the first package body 810 and the second package body 820 and between the first package body 810 and the third package body 830 to transmit electrical signals including AUX+ / -, HPD, INT / RET / PWDN / GND, I2C, etc. Combined with reference Figure 7 and Figure 6 ,exist Figure 7 In the first package 810 shown, the first connector 801 corresponding to the first cable transmits a first electrical signal, while the first connector 801 corresponding to the second cable transmits a second electrical signal. A connector is used to transmit a mixed video signal and control signal between the first package 810 and the video source module 100 (i.e., the computing power SoC). The first package 810 is powered by a 12V power supply.

[0039] Figure 8 A schematic diagram of a second package provided by this application is given. Figure 8As shown, the second package 820 includes a first optical receiving module 401, a first connector 801, and a second connector 802. The first optical receiving module 401 uses a 4×16G Rx optical module, which receives the optical signal transmitted from the optical fiber connector Pigtail through a photodetector PD, processes it into a first video stream through a transimpedance amplifier TIA, and transmits it to the second connector 802. The first electrical signal is transmitted through the electrical signal transmission path formed by the first cable, the first connector 801, and the second connector 802. The second connector 802 is used to summarize and arrange the electrical signal interfaces between the second package 820 and the first display screen 701, and between the third package 830 and the second display screen 702, to transmit video streams and electrical signals. The second package 820 is connected to the first display screen 701 through the second connector 802, and uses the 12V power supply provided by the first display screen 701 as the power source.

[0040] Figure 9 A schematic diagram of a third package provided by this application is given. Figure 9 As shown, the third package body 830 includes a second optical receiving module 402, a first connector 801, a second connector 802 and an interface conversion unit 410. The second optical receiving module 402 uses a 4×16G Rx optical module, receives the optical signal transmitted from the optical fiber connector Pigtail through the photodetector PD, and processes it into a second video stream through the transimpedance amplifier TIA, and transmits it to the interface conversion unit 410. In this embodiment, the interface conversion unit 410 is an eDP to LVDS processing unit, which is used to process the second video stream into a signal format that can be adapted to the display screen using the OLDI protocol. After completing the format conversion, the interface conversion unit 410 transmits the second video stream to the second connector 802. The second electrical signal is transmitted through the electrical signal transmission path formed by the second cable, the first connector 801 and the second connector 802. The third package body 830 is connected to the second display screen 702 through the second connector 802, and uses the 12V power supply provided by the second display screen 702 as the power source. It should be understood that, in this embodiment, the second display screen 702 adopts a 1440×480 pixel display screen merely as an example of a feasible display device adopting the OLDI protocol, and does not serve as a specific limitation on the pixel requirements of the display screen.

[0041] In various embodiments provided herein, the optical fiber includes at least one multimode optical fiber and / or multiple single-mode optical fibers, and the cable includes at least one shielded twisted pair cable or at least one coaxial cable. The first connector and / or the second connector may be a connector adapted for a flexible flat cable.

[0042] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional circuits and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional circuits and modules as needed, that is, the internal structure of the device can be divided into different functional circuits or modules to complete all or part of the functions described above. The functional circuits and modules in the embodiment can be integrated into a processing circuit, or each circuit can exist physically alone, or two or more circuits can be integrated into one circuit. The above-mentioned integrated circuit can be implemented in the form of hardware or in the form of a software functional circuit. In addition, the specific names of the functional circuits and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention. The specific working process of the circuits and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0043] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A vehicle-mounted video signal transmission system for transmitting video signals to at least two display screens, characterized in that: include: A video source module is used to output video signals and interact with at least two display screens to control signals; a split-screen processing module, configured to receive a video signal output by the video source module and exchange control signals with the video source module, wherein the video signal is converted into at least two video streams, including a first video stream and a second video stream, and the control signal includes a first electrical signal and a second electrical signal, wherein the first electrical signal is associated with the first video stream and the second electrical signal is associated with the second video stream; An optical sending module, configured to convert the first video stream and the second video stream output by the split-screen processing module into optical signals and transmit them through optical fibers; An optical receiving module, configured to receive an optical signal from an optical fiber and convert the received optical signal into a first video stream and a second video stream; An electrical signal transmission module, configured to transmit the first electrical signal and the second electrical signal to the display screen via a cable, or to transmit the first electrical signal and the second electrical signal output by the display screen to the split-screen processing module via a cable; The first video stream is transmitted to one of the at least two display screens for display, and the second video stream is transmitted to the other one of the at least two display screens for display.

2. The system according to claim 1, wherein: The split-screen processing module at least includes a video stream processing unit, a bus control unit and a micro control unit; The video stream processing unit is used to convert the video signal into at least two sets of video streams, and transmit the configuration data of at least two display screens to the video source module through a control signal; The bus control unit has at least two communication ports for correspondingly allocating to the at least two display screens, and the at least two communication ports are configured as the same bus address, so that the at least two display screens exchange control signals with the video source module through the same bus address; The micro control unit is used to transmit the instruction data output by the video source module to the at least two display screens through a control signal or transmit the event data generated by the at least two display screens to the video source module through a control signal; The at least two groups of video streams output by the video stream processing unit are both AC coupled electrical signals, and the signal amplitude is greater than 200mV, so as to drive the optical sending module.

3. The system according to claim 2, characterized in that The optical receiving module further includes an interface conversion unit configured to convert the first video stream and / or the second video stream output by the optical receiving module into a format adapted to the display screen configuration data.

4. The system according to claim 2, wherein: The micro control unit is further used to control the video stream processing unit to adjust the working parameters of the optical sending module, or to directly adjust the working parameters of the optical sending module.

5. The system according to claim 2, wherein: The bus control unit is I 2 C. A switch chip having at least two communication ports and one bus port, wherein the at least two display screens are respectively connected to the at least two communication ports; When the at least two display screens interact with the video source module through control signals, the I 2 The C switch chip opens the communication port corresponding to the display screen that is exchanging control signals and closes the communication port corresponding to the display screen that is not exchanging control signals according to the interaction status of the at least two display screens.

6. The system according to claim 2, wherein: The at least two display screens include a first display screen and a second display screen; The first electrical signal includes a first address signal, a first configuration signal and a first control signal, and the second electrical signal includes a second address signal, a second configuration signal and a second control signal; The first address signal and the second address signal are transmitted through the at least two communication ports, respectively representing the communication port address corresponding to the first display screen and the communication port address corresponding to the second display screen, and the bus control unit receives the first address signal and the second address signal through the same bus address and transmits them to the video source module; The first configuration signal and the second configuration signal are transmitted through the video stream processing unit, and represent the configuration data of the first display screen and the configuration data of the second display screen respectively; The first control signal and the second control signal are transmitted through the microcontroller unit, the first control signal represents the instruction data output by the video source module to the first display screen or the event data generated by the first display screen, and the second control signal represents the instruction data output by the video source module to the second display screen or the event data generated by the second display screen.

7. The system according to claim 1, wherein: The optical transmission module includes a first optical transmission module for converting the first video stream into an optical signal and a second optical transmission module for converting the second video stream into an optical signal; The split-screen processing module and the optical sending module are packaged together to form a first package body.

8. The system according to claim 7, characterized in that The optical receiving module includes a first optical receiving module that converts the received optical signal into a first video stream and a second optical receiving module that converts the received optical signal into a second video stream; The electrical signal transmission module includes a first electrical transmission module for transmitting a first electrical signal and a second electrical transmission module for transmitting a second electrical signal, wherein the first electrical transmission module includes a first cable, a first connector connected to both ends of the first cable, and a second connector for outputting a first video stream to a display screen, and the second electrical transmission module includes a second cable, a first connector connected to both ends of the second cable, and a second connector for outputting a second video stream to a display screen; The first optical receiving module and the second connector in the first electrical transmission module are packaged together to form a second package body, and the second optical receiving module and the second connector in the second electrical transmission module are packaged together to form a third package body; The first cable and the first connectors at both ends thereof are used to transmit electrical signals between the first package and the second package, and the second cable and the first connectors at both ends thereof are used to transmit electrical signals between the first package and the third package.

9. The system according to claim 8, characterized in that The optical transmitting module and the optical receiving module both use automotive-grade optoelectronic chips, and the first package body and the second package body, as well as the first package body and the third package body, are connected through optical fibers and pluggable optical connectors.

10. The system according to claim 8, wherein: The power required by the second package body and the third package body is provided by the at least two display screens.

11. The system according to claim 1, wherein: The split-screen processing module is further used to separate an audio signal from a video signal, and the audio signal is transmitted to the at least two display screens via the electrical signal transmission module.

12. The system according to claim 1, wherein: The optical fiber includes at least one multimode optical fiber and / or multiple single-mode optical fibers, and the cable includes at least one shielded twisted-pair cable or at least one coaxial cable.

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