Master control board direct drive type dot matrix screen system and automobile
The UART-SPI communication conversion module converts the UART signal of the main control board into an SPI signal to directly drive the LED display module, which solves the problems of hardware resource waste and master-slave MCU matching in the dot matrix screen system, and realizes the simplification of hardware circuit and system architecture.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LANCE VEHICLE TECH CO LTD
- Filing Date
- 2025-08-20
- Publication Date
- 2026-07-07
AI Technical Summary
In the existing technology, the master-slave MCU architecture of the dot matrix screen system leads to waste of hardware resources and increased difficulty in matching the master and slave systems. Especially when the total number of LEDs is less than 2000, the master MCU resources are surplus and the use of slave node MCUs increases the system complexity.
The main control board directly drives the dot matrix screen system. The UART signal sent by the MCU control module of the main control board is converted into SPI signal through the UART-SPI communication conversion module, which directly drives the LED driver display module, eliminating the need for the slave node MCU, simplifying the hardware circuit, and allowing the main control board MCU to directly control the LED board.
The system hardware circuitry was simplified, the system complexity was reduced, the MCU matching problem between the master and slave systems was solved, and a simpler system architecture was achieved.
Smart Images
Figure CN224472176U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive LED lighting control, specifically relating to a main control board direct-drive dot matrix screen system and an automobile. Background Technology
[0002] With the development of automotive intelligence, users' demand for a cooler, more personalized, and more trendy visual system for the car body has rapidly promoted the development of direct-drive dot matrix screen systems for automotive main control boards.
[0003] In related technologies, the architecture of a dot matrix display system is a master-slave MCU architecture. The master MCU processes vehicle body commands, receiving and outputting lighting commands to each LED board. Each LED board has a slave MCU to receive lighting commands from the master MCU and output SPI drive signals to the LED driver to illuminate the LEDs. The master and slave MCUs communicate via a CAN-FD bus. This architecture wastes the master MCU's resources, especially for dot matrix display systems with fewer than 2000 LEDs. The total amount of data to be processed is small, and vehicle body signal processing and lighting drive signals can all be handled by the master MCU. Adding slave node MCUs to the LED boards wastes hardware resources and increases the difficulty of master-slave system matching.
[0004] Therefore, reducing the number of MCUs used in dot matrix displays with fewer than 2000 LEDs is a pressing technical issue that needs to be addressed.
[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content
[0006] This disclosure provides at least one main control board direct-drive dot matrix screen system and an automobile.
[0007] In a first aspect, embodiments of this disclosure provide a main control board directly driven dot matrix screen system, including:
[0008] The main control board is equipped with an MCU control module;
[0009] N light boards, each of which is communicatively connected to the MCU control module of the main control board;
[0010] The light panel also includes:
[0011] UART-SPI communication conversion module and LED driver display module;
[0012] The UART-SPI communication conversion module is electrically connected to the LED driver display module;
[0013] Furthermore, the UART-SPI communication conversion module is used to convert the UART signal sent by the MCU control module received by the lamp board into an SPI signal, and drive the LED driver display module to display.
[0014] In one optional implementation, the main control board is further provided with a first communication module, which is electrically connected to the MCU control module;
[0015] The lamp panel is also provided with a second communication module, which is electrically connected to the UART-SPI communication conversion module;
[0016] The main control board is connected to the second communication module of the light board through the first communication module.
[0017] In one alternative implementation, the first communication module and the second communication module are connected via a UARToverCAN bus.
[0018] In one optional implementation, the main control board further includes:
[0019] A lighting effect storage module, which is electrically connected to the MCU control module, is used to store dynamic lighting effects;
[0020] The receiving module is electrically connected to the MCU control module and is used to receive vehicle body commands.
[0021] In one optional implementation, the main control board further includes:
[0022] A front-end protection module, which is electrically connected to the MCU control module;
[0023] A power module is used to provide a constant voltage to the lamp panel.
[0024] In one optional implementation, the UART-SPI communication conversion module includes a conversion chip U2;
[0025] Furthermore, the conversion chip U2 is a TI TLC69697-Q1;
[0026] The communication chip U7 of the second communication module is a TI TCAN1044AV.
[0027] Pins 3 and 4 of the conversion chip U2 are used to receive the differential UART CAN signal sent by pins 1 and 4 of the communication chip U7, and convert the differential UART CAN signal into an SPI signal through the conversion chip U2, and send it to the LED driver display module through pins 8 and 9 of the conversion chip U2.
[0028] In one alternative implementation, the number of light panels N ≥ 3.
[0029] Secondly, this disclosure also provides a main control board directly driven dot matrix screen system, including:
[0030] The MCU control module is located on the main control board;
[0031] Multiple UART-SPI communication conversion modules are mounted on corresponding lamp boards;
[0032] The MCU control module is communicatively connected to the UART-SPI communication conversion module;
[0033] The main control board and the lamp board are connected via a UART over CAN bus.
[0034] In one optional implementation, the main control board is further provided with a first communication module, which is electrically connected to the MCU control module;
[0035] The lamp panel is also provided with a second communication module, which is electrically connected to the UART-SPI communication conversion module;
[0036] The main control board is connected to the second communication module of the light board through the first communication module.
[0037] Thirdly, this disclosure also provides an automobile, including: an automobile body and a main control board directly driven dot matrix screen system as described above.
[0038] The beneficial effects of this utility model are that the main control board directly drives the dot matrix screen system and the automobile, and converts the UART signal sent by the MCU control module of the main control board into an SPI signal through the UART-SPI communication conversion module, directly driving the LED driver display module, eliminating the need for the slave node MCU, simplifying the hardware circuit, reducing the system hardware complexity, and making the system architecture more concise. At the same time, the lamp board is directly controlled by the main control board MCU, solving the problem of master-slave MCU matching between the master and slave systems in the dot matrix screen system architecture in related technologies from the source.
[0039] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.
[0040] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0041] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0042] Figure 1 The electrical control schematic diagram of the main control board directly driven dot matrix screen system provided in the embodiments of this disclosure;
[0043] Figure 2 A circuit diagram of a front-end protection module provided in an embodiment of this disclosure;
[0044] Figure 3 A circuit diagram of a power module provided for an embodiment of this disclosure;
[0045] Figure 4 A circuit diagram of the MCU control module provided in the embodiments of this disclosure;
[0046] Figure 5 A circuit diagram of the first communication module provided in an embodiment of this disclosure;
[0047] Figure 6 A circuit diagram of a lighting effect storage module provided in an embodiment of this disclosure;
[0048] Figure 7 A circuit diagram of the second communication module provided in an embodiment of this disclosure;
[0049] Figure 8 A circuit diagram of a UART-SPI communication conversion module provided in an embodiment of this disclosure;
[0050] Figure 9 A circuit diagram of an LED driver display module provided in an embodiment of this disclosure. Detailed Implementation
[0051] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0052] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.
[0053] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.
[0054] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0055] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless this is clearly stated otherwise. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of a feature, step, operation, element, and / or component, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof.
[0056] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.
[0057] Research has revealed that in related technologies, the master and slave MCUs communicate via a CAN-FD bus. This architecture results in significant resource surplus and waste for the master MCU, especially in dot matrix display systems directly driven by a master control board with fewer than 2000 LEDs. The total amount of data to be processed is relatively small, and the master MCU can handle vehicle signal processing and lighting drive signals. Adding a slave MCU to the lamp board wastes hardware resources and increases the difficulty of matching the master and slave systems.
[0058] Based on the above research, this disclosure provides a main control board direct-drive dot matrix screen system and a vehicle that uses a UART-SPI communication conversion module to convert the UART signal sent by the MCU control module of the main control board into an SPI signal to directly drive the LED driver display module. This simplifies the hardware circuit and solves the matching problem between the master and slave MCUs in the dot matrix screen system architecture in related technologies from the source.
[0059] The shortcomings of the above solutions are the result of the utility model inventor's practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as contributions made by the utility model inventor to this disclosure.
[0060] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0061] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0062] Please see Figure 1At least one embodiment provides a main control board directly driven dot matrix screen system, including: a main control board, which is equipped with an MCU control module; N lamp boards, each of which is communicatively connected to the MCU control module of the main control board; wherein, each lamp board further includes: a UART-SPI communication conversion module and an LED driving display module; the UART-SPI communication conversion module is electrically connected to the LED driving display module; and the UART-SPI communication conversion module is used to convert the UART signal sent by the MCU control module received by the lamp board into an SPI signal, and drive the LED driving display module to perform display. By converting the UART signal sent by the MCU control module of the main control board into an SPI signal through the UART-SPI communication conversion module, the LED driving display module is directly driven, eliminating the need for a slave node MCU, which simplifies the hardware circuit, reduces the system hardware complexity, and makes the system architecture more concise. At the same time, the lamp boards are directly controlled by the MCU of the main control board, solving the problem of master-slave MCU matching between the master and slave systems in the dot matrix screen system architecture of related technologies from the source.
[0063] The circuit diagram of the MCU control module is as follows: Figure 4 As shown, it includes: the main control chip U6, model number NXP FS32K146.
[0064] The circuit diagram of the UART-SPI communication conversion module is as follows: Figure 8 As shown, the UART-SPI communication conversion module includes a conversion chip U2; and the conversion chip U2 is a TI TLC69697-Q1; the communication chip U7 of the second communication module is a TI TCAN1044AV; pins 3 and 4 of the conversion chip U2 are used to receive the differential UART CAN signal sent by pins 1 and 4 of the communication chip U7, and convert the differential UART CAN signal into an SPI signal through the conversion chip U2, and send it to the LED driver display module through pins 8 and 9 of the conversion chip U2.
[0065] The U2 converter chip supports 4MHz UART signal input and can convert it to a 16.5MHz SPI signal (including SCLK, SIN, and SOUT). The U2 converter chip has two address bits, allowing up to four conversion circuits to be configured on a single UART over CAN bus. This increases the number of LEDs controlled on a single bus, enabling effective system control via the main control board's MCU module without the need for a slave node MCU.
[0066] In practical applications, a resistor R19 (typically 51R), a ferrite bead B13, and a small-value capacitor C9 can be added to pin 8 of the converter chip U2 to optimize the clock signal waveform and improve EMC results. A small-value capacitor (typically 10nF) is reserved at pin 14 (VCC) of the converter chip U2 to reduce noise coupling.
[0067] The circuit diagram of the LED driver display module is as follows: Figure 9 As shown, the system includes LED driver chips U3 and U4, and an LED dot matrix display screen. Driver chips U3 and U4 are TI TLC69635-Q1 chips, each containing 24 channels. In a single SPI (SIN, SOUT, SCLK) link, up to 511 TLC69635-Q1 chips can be cascaded. When working with conversion chip U2, the SCLK clock signal is cascaded in a one-to-many star topology, with the output from conversion chip U2 connected to each LED driver chip. The SIN and SOUT data links are daisy-chained, with data output from the SOUT pin of conversion chip U2 sequentially entering the SIN pin of the next-stage LED driver chip, and then being input to the next stage from the SOUT pin of the next LED driver chip. Finally, the SOUT input of the last-stage LED driver chip returns to the SIN pin of conversion chip U2, forming a closed-loop data link. In practical applications, ferrite beads can be added to the SCLK pin of the LED driver chips, and a voltage divider network can be configured to improve EMC performance.
[0068] Please continue reading. Figure 1 The main control board is further provided with a first communication module, which is electrically connected to the MCU control module; the lamp board is further provided with a second communication module, which is electrically connected to the UART-SPI communication conversion module; the main control board communicates with the second communication module of the lamp board through the first communication module.
[0069] The first communication module and the second communication module are connected via UART over CAN bus.
[0070] Specifically, the circuit diagram of the first communication module is as follows: Figure 5 As shown, the system includes: a communication chip U4, model TITCAN1044AV, whose pins 1 and 4 are connected to the main control chip U6. Pin 5 of the communication chip U4, the level conversion interface VIO, is connected to an external 3.3V, enabling the communication chip U4 to directly adapt to the voltage of the main control chip U6 for communication. The UART signal output by the main control chip U6 is converted into a UART CAN differential signal by the communication chip U4 and input to the lamp board.
[0071] The circuit diagram of the second communication module is as follows: Figure 7As shown, it includes: communication chip U7, model TI TCAN1044AV, which restores the differential signal of UART CAN input from the main control board into a UART signal and transmits it to the conversion chip U2.
[0072] Please continue reading. Figure 1 The main control board further includes: a lighting effect storage module, which is electrically connected to the MCU control module and is used to store dynamic lighting effects; and a receiving module, which is electrically connected to the MCU control module and is used to receive vehicle body commands.
[0073] The circuit diagram of the lighting effect storage module is as follows: Figure 6 As shown, this includes Flash chip U7, model number GigaDevice GD25B128MEY2GR. This chip is connected to the main MCU via SPI and is used to store the lighting effect signals transmitted via the vehicle's CANFD bus.
[0074] Please continue reading. Figure 1 The main control board also includes: a front-end protection module, which is electrically connected to the MCU control module; and a power module, which provides a constant voltage to the lamp board.
[0075] The circuit diagram of the front-end protection module is as follows: Figure 2 As shown, the system includes a TVS diode T1, filter capacitors C1-C4, a reverse protection diode D1, and a reverse protection PMOS transistor Q4. The positive terminal of the TVS diode T1 is connected to the vehicle body voltage level KL56. The drain terminal of the reverse protection PMOS transistor Q4 is connected to the power supply KL56, and a Zener diode D4 and a capacitor C115 are connected in series between the gate and source terminals to protect the reverse protection PMOS transistor Q4.
[0076] It should be noted that the number of light boards N≥3. If a slave MCU is added to each light board due to the large number of light boards, the architecture of the entire system will become too cumbersome, and the performance of the master and slave MCUs will be excessive. Therefore, by directly controlling the light boards with the MCU of the master control board, the matching problem between the master and slave systems in the master-slave dot matrix screen system architecture directly driven by the master control board in related technologies is solved from the source.
[0077] Please see Figure 1 This disclosure also provides a main control board directly driven dot matrix screen system, including: an MCU control module disposed on the main control board; multiple UART-SPI communication conversion modules disposed on corresponding lamp boards; the MCU control module and the UART-SPI communication conversion modules are communicatively connected; wherein the main control board and the lamp boards are communicatively connected via a UART over CAN bus.
[0078] The main control board is further provided with a first communication module, which is electrically connected to the MCU control module; the lamp board is further provided with a second communication module, which is electrically connected to the UART-SPI communication conversion module; the main control board communicates with the second communication module of the lamp board through the first communication module.
[0079] At least one embodiment also provides an automobile, including: an automobile body and a main control board direct-drive dot matrix screen system as described above.
[0080] The UART-SPI communication conversion module converts the UART signals sent by the MCU control module of the main control board into SPI signals, which directly drive the LED display module. This eliminates the need for a slave node MCU, simplifies the hardware circuit, reduces system hardware complexity, and makes the system architecture more concise. At the same time, the LED board is directly controlled by the MCU of the main control board, which solves the problem of master-slave MCU matching between the master and slave systems in the master-slave dot matrix screen system architecture directly driven by the main control board from the source.
[0081] In summary, this utility model provides a main control board directly driven dot matrix screen system and an automobile. The main control board directly driven dot matrix screen system includes: a main control board, which is equipped with an MCU control module; N light boards, each of which is communicatively connected to the MCU control module of the main control board; each light board further includes: a UART-SPI communication conversion module and an LED driving display module; the UART-SPI communication conversion module is electrically connected to the LED driving display module; and the UART-SPI communication conversion module is used to convert the UART signals received by the MCU control module from the light board into SPI signals, and drive the LED driving display module for display. By converting the UART signals sent by the MCU control module of the main control board into SPI signals through the UART-SPI communication conversion module, the LED driving display module is directly driven, eliminating the need for a slave node MCU, simplifying the hardware circuit, reducing system hardware complexity, and making the system architecture more concise. Furthermore, since the light boards are directly controlled by the main control board MCU, the matching problem between the master and slave MCUs in the main and slave systems of the main control board directly driven dot matrix screen system architecture is solved from the source.
[0082] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0083] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.
[0084] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.
[0085] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.
[0086] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A main control board directly driven dot matrix screen system, characterized in that, include: The main control board is equipped with an MCU control module; N light boards, each of which is communicatively connected to the MCU control module of the main control board; The light panel also includes: UART-SPI communication conversion module and LED driver display module; The UART-SPI communication conversion module is electrically connected to the LED driver display module; Furthermore, the UART-SPI communication conversion module is used to convert the UART signal sent by the MCU control module received by the lamp board into an SPI signal, and drive the LED driver display module to display.
2. The main control board directly driven dot matrix screen system as described in claim 1, characterized in that, The main control board is also provided with a first communication module, which is electrically connected to the MCU control module; The lamp panel is also provided with a second communication module, which is electrically connected to the UART-SPI communication conversion module; The main control board is connected to the second communication module of the light board through the first communication module.
3. The main control board direct-drive dot matrix screen system as described in claim 2, characterized in that, The UART-SPI communication conversion module includes a conversion chip U2; Furthermore, the conversion chip U2 is a TI TLC69697-Q1; The communication chip U7 of the second communication module is a TI TCAN1044AV. Pins 3 and 4 of the conversion chip U2 are used to receive the differential UART CAN signal sent by pins 1 and 4 of the communication chip U7, and convert the differential UART CAN signal into an SPI signal through the conversion chip U2, and send it to the LED driver display module through pins 8 and 9 of the conversion chip U2.
4. The main control board directly driven dot matrix screen system as described in claim 2, characterized in that, The first communication module and the second communication module are connected via UART over CAN bus.
5. The main control board directly driven dot matrix screen system as described in claim 2, characterized in that, The main control board also includes: A lighting effect storage module, which is electrically connected to the MCU control module, is used to store dynamic lighting effects; The receiving module is electrically connected to the MCU control module and is used to receive vehicle body commands.
6. The main control board directly driven dot matrix screen system as described in claim 5, characterized in that, The main control board also includes: A front-end protection module, which is electrically connected to the MCU control module; A power module is used to provide a constant voltage to the lamp panel.
7. The main control board directly driven dot matrix screen system as described in claim 1, characterized in that, The number of light panels, N, is ≥ 3.
8. A main control board directly driven dot matrix screen system, characterized in that, include: The MCU control module is located on the main control board; Multiple UART-SPI communication conversion modules are mounted on corresponding lamp boards; The MCU control module is communicatively connected to the UART-SPI communication conversion module; The main control board and the lamp board are connected via UART over CAN bus communication.
9. The main control board directly driven dot matrix screen system as described in claim 8, characterized in that, The main control board is also provided with a first communication module, which is electrically connected to the MCU control module; The lamp panel is also provided with a second communication module, which is electrically connected to the UART-SPI communication conversion module; The main control board is connected to the second communication module of the light board through the first communication module.
10. A car, characterized in that, include: Includes the vehicle body and the main control board direct-drive dot matrix screen system as described in any one of claims 1-9.