Multi-screen blackboard

Abstract

The embodiment of the invention discloses a multi-screen blackboard which comprises a main screen and at least one auxiliary screen, a main control module and a first signal processing module are arranged in the main screen, and a second signal processing module is arranged in the auxiliary screen. The main control module is connected with the first signal processing module and the second signal processing module through the video signal transmission interface, and the main control module determines a main screen and an auxiliary screen according to a first display screen identification code of the first signal processing module and a second display screen identification code of the second signal processing module. After a video signal is received subsequently, the main control module can distribute the video signal to the first signal processing module and the second signal processing module according to the display mode, so that the main screen and the auxiliary screen display corresponding pictures. According to the multi-screen blackboard provided by the embodiment of the invention, content display can be carried out in each screen according to use requirements, and the technical problem that the content display area of an intelligent blackboard in the prior art is limited is solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the display field, and in particular to a multi-screen blackboard. Background Art

[0002] Nowadays, with the development of technology, smart blackboards have begun to enter the classroom for teachers to use in the teaching process. The smart blackboard uses capacitive touch technology to combine the traditional handwriting blackboard with multimedia devices, so that the smart blackboard can be written like an ordinary blackboard, and can also be touched by hand to watch PPT videos, pictures, animations and other rich multimedia applications. At present, the smart blackboards on the market are generally equipped with multiple display screens. The common type is generally to set up three horizontally arranged display screens. The middle display screen is used for content display, such as displaying images or playing videos and PPTs, etc., while the display screens on the left and right sides are writing screens, which can only be used for writing and blackboard writing, and cannot be used for content display. This approach results in a limited area for content display on the smart blackboard, which cannot meet the usage requirements when the content needs to be displayed on multiple screens.

[0003] In summary, the smart blackboard in the prior art has the technical problem of limited content display area. Summary of the invention

[0004] The embodiment of the present invention provides a multi-screen blackboard, which can expand the content display area of ​​the smart blackboard, solving the technical problem of the limited content display area of ​​the smart blackboard in the prior art.

[0005] The embodiment of the present invention provides a multi-screen blackboard, comprising a main screen and at least one sub-screen, wherein the main screen comprises a main control module and a main circuit board, wherein the main circuit board comprises a first signal processing module; the sub-screen comprises a sub-circuit board, wherein the sub-circuit board comprises a second signal processing module; the main control module is connected to the first signal processing module and the second signal processing module via a video signal transmission interface;

[0006] The main control module is used to obtain the first display screen identification code and the second display screen identification code from the first signal processing module and the second signal processing module respectively through the video signal transmission interface, and determine the main screen and the sub-screen according to the first display screen identification code and the second display screen identification code; and is used to generate at least one video signal, and distribute the at least one video signal to the first signal processing module and the second signal processing module according to the display modes of the main screen and the sub-screen;

[0007] The first signal processing module is used to store the first display screen identification code, and is used to receive the video signal, and drive the main screen to display the corresponding picture according to the video signal;

[0008] The second signal processing module is used to store the second display screen identification code, and to receive the video signal, and drive the auxiliary screen to display the corresponding picture according to the video signal.

[0009] As mentioned above, an embodiment of the present invention provides a multi-screen blackboard, which includes a main screen and at least one sub-screen, wherein the main screen includes a main control module and a first signal processing module, and the sub-screen includes a second signal processing module, and the main control module is connected to the first signal processing module and the second signal processing module through a video signal transmission interface, and the main control module determines the main screen and the sub-screen according to the first display screen identification code of the first signal processing module and the second display screen identification code of the second signal processing module. After the main control module generates a video signal, the main control module can distribute the video signal to the first signal processing module and the second signal processing module according to the display mode, so that the main screen and the sub-screen display corresponding pictures. The multi-screen blackboard provided in this embodiment can display content on each screen according to usage requirements, expand the area used for content display, and solve the technical problem of the limited content display area of ​​the smart blackboard in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 One of the structural schematic diagrams of a multi-screen blackboard provided in an embodiment of the present invention.

[0011] Figure 2 A schematic diagram of a flow chart of video signal distribution by a main control module provided in an embodiment of the present invention.

[0012] Figure 3 The second structural schematic diagram of a multi-screen blackboard provided in an embodiment of the present invention.

[0013] Figure 4 The third structural schematic diagram of a multi-screen blackboard provided in an embodiment of the present invention.

[0014] Figure 5 The fourth structural schematic diagram of a multi-screen blackboard provided in an embodiment of the present invention.

[0015] Figure 6 The fifth structural schematic diagram of a multi-screen blackboard provided in an embodiment of the present invention.

[0016] Figure 7 The sixth structural schematic diagram of a multi-screen blackboard provided in an embodiment of the present invention.

[0017] Figure 8 The seventh structural schematic diagram of a multi-screen blackboard provided in an embodiment of the present invention.

[0018] Fig. 9A schematic diagram of the connection between the main control module, the first signal processing module and the second signal processing module provided in an embodiment of the present invention.

[0019] Fig.10 The eighth structural schematic diagram of a multi-screen blackboard provided in an embodiment of the present invention.

[0020] Fig.11 A schematic diagram of a process for adjusting backlight brightness value provided by an embodiment of the present invention.

[0021] Fig.12 The ninth structural diagram of a multi-screen blackboard provided in an embodiment of the present invention.

[0022] Fig.13 A schematic diagram of a transmission path of a video signal provided by an embodiment of the present invention.

[0023] Fig.14 The tenth structural schematic diagram of a multi-screen blackboard provided in an embodiment of the present invention.

[0024] Reference numerals:

[0025] Main screen 1, sub-screen 2, main control module 10, main circuit board 11, first signal processing module 12, sub-circuit board 21, second signal processing module 22, first touch control module 13, data transmission interface 14, first interface module 15, second touch control module 23, second interface module 24, peripheral connection module 25, key module 26, external voltage source 3, first power conversion module 16, second power conversion module 27, first backlight driving module 17, second backlight driving module 28, first TCON module 18, first interface module 19, second TCON module 29, sub-screen 4, sub-circuit board 41, second signal processing module 42, second power conversion module 43, second touch control module 44, second interface module 45, second TCON module 46, second backlight driving module 47. DETAILED DESCRIPTION

[0026] The following description and accompanying drawings fully illustrate the specific embodiments of the present application so that those skilled in the art can practice them. The examples represent possible variations only. Unless explicitly required, separate components and functions are optional, and the order of operation can vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. The scope of the embodiments of the present application includes the entire scope of the claims, and all available equivalents of the claims. In this article, each embodiment may be represented individually or generally by the term "invention", which is only for convenience, and if more than one invention is disclosed in fact, it is not intended to automatically limit the scope of the application to any single invention or inventive concept. In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, without requiring or implying any actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed. The various embodiments are described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. As for the structures, products, etc. disclosed in the embodiments, since they correspond to the parts disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0027] The embodiment of the present invention provides a multi-screen blackboard, wherein the multi-screen blackboard refers to a smart blackboard with multiple screens, and the screen refers to a device for displaying images and colors. The multi-screen blackboard provided by the embodiment of the present invention includes a main screen and at least one sub-screen, the main screen includes a main control module and a main circuit board, the main circuit board includes a first signal processing module; the sub-screen includes a sub-circuit board, and the sub-circuit board includes a second signal processing module; the main control module is connected to the first signal processing module and the second signal processing module through a video signal transmission interface.

[0028] The multi-screen blackboard of the embodiment of the present invention includes a main screen and at least one sub-screen, wherein the number of sub-screens can be set according to actual needs, for example, the number of sub-screens can be set to two, etc., and the number of sub-screens is not specifically limited in this embodiment. Figure 1 As shown, Figure 1A schematic diagram of the structure of a multi-screen blackboard provided in an embodiment of the present invention, wherein the multi-screen blackboard includes a main screen 1 and a sub-screen 2. In this embodiment, the main screen 1 and the sub-screen 2 are used to distinguish screens with different internal circuit structures. The main screen 1 includes a main control module 10 and a main circuit board 11, and the main circuit board 11 includes a first signal processing module 12. The main control module refers to a module used to control and manage the multi-screen blackboard. For example, the main control module can be a PC module, wherein the PC (personal computer) module is a computer module, which is composed of a processor or a microcontroller, memory, storage, power management and circuit board, and requires an operating system such as Linux, WINCE, QNX, etc., to form a minimized computer system. The main circuit board refers to a circuit board arranged in the main screen. The functional modules and circuit elements inside the main screen can be fixed on the main circuit board. The main circuit board can power the functional modules and circuit elements to realize signal transmission. The first signal processing module refers to a module that controls and manages the main screen. For example, the first signal processing module can be a device with data processing capabilities such as a CPU or a single-chip microcomputer. In this embodiment, the first signal processing module can be set on the main circuit board, for example, it can be fixed on the main circuit board by soldering. The main circuit board supplies power to the first signal processing module and realizes signal transmission between the first signal processing module and other functional modules on the main circuit board.

[0029] like Figure 1 As shown, the difference between the internal circuit structure of the auxiliary screen and the main screen in this embodiment is that the auxiliary screen 2 only includes an auxiliary circuit board 21, and the auxiliary circuit board 21 includes a second signal processing module 22, and the auxiliary screen 2 does not include a main control module 10. The auxiliary circuit board refers to a circuit board arranged in the auxiliary screen, and the second signal processing module is a module for controlling the auxiliary screen. In this embodiment, the function of the auxiliary circuit board is similar to that of the main circuit board, and the function of the second signal processing module is similar to that of the first signal processing module, which will not be repeated in this embodiment.

[0030] It should be further explained that, in this embodiment, the main control module is connected to the first signal processing module and the second signal processing module via a video signal transmission interface. The video signal transmission interface refers to an interface for transmitting video signals, such as a HDMI (High Definition Multimedia Interface), a VGA (Video Graphics Array) interface, or an AV composite video interface, which is not specifically limited in this embodiment. Figure 1Taking HDMI as an example of a video signal transmission interface, multiple HDMIs are arranged on the main control module, one HDMI is arranged on the main circuit board and the auxiliary circuit board, and the first signal processing module is connected to the HDMI on the main circuit board, and the second signal processing module is connected to the HDMI on the auxiliary circuit board, so that video signals can be transmitted between the main control module and the first signal processing module, and between the main control module and the second signal processing module.

[0031] The main control module is used to obtain the first display screen identification code and the second display screen identification code from the first signal processing module and the second signal processing module respectively through the video signal transmission interface, and determine the main screen and the sub-screen according to the first display screen identification code and the second display screen identification code; and is used to generate at least one video signal, and distribute at least one video signal to the first signal processing module and the second signal processing module according to the display mode of the main screen and the sub-screen.

[0032] In this embodiment, the first display screen identification code is pre-stored in the first signal processing module, and the second display screen identification code is pre-stored in the second signal processing module, wherein the display screen identification code refers to an identification code used to distinguish the screen, and each screen has a corresponding display screen identification code. The corresponding screen can be found according to the display screen identification code. The first display screen identification code corresponds to the main screen, and the second display screen identification code corresponds to the sub-screen. In this embodiment, the display screen identification code can use EDID (Extended display identification data), which contains parameters related to the display and its performance, including supplier information, maximum image size, color settings, manufacturer presets, frequency range restrictions, and character strings of display names and serial numbers, etc. In this embodiment, the corresponding EDID can be pre-stored in the first signal processing module and the second signal processing module.

[0033] When the subsequent multi-screen blackboard is powered on, the main control module is also powered on and started. After that, the main control module will obtain the first display screen identification code and the second display screen identification code from the first signal processing module and the second signal processing module respectively through the video signal transmission interface, and determine the main screen and the sub-screen according to the first display screen identification code and the second display screen. Exemplarily, the user can enter the first display screen identification code and the second display screen identification code in the main control module in advance, and identify the screen corresponding to the first display screen identification code as the main screen, and the other display screen identification codes are all identified as sub-screens. The subsequent main control module can determine the main screen and the sub-screen according to the obtained first display screen identification code and the second display screen identification code.

[0034] After the main control module determines the main screen and the sub-screen, when at least one video signal is subsequently generated, the main control module can distribute at least one video signal to the first signal processing module and the second signal processing module according to the display mode of the main screen and the sub-screen. The video signal refers to a television signal, a still image signal, and a visual television image signal. In this embodiment, the video signal can be one channel or multiple channels, and the video content of each video signal can be different. When the main control module distributes the video signal, it first needs to determine the display mode of the main screen and the sub-screen, wherein the display mode refers to the form of displaying the picture on the main screen and the sub-screen. For example, the display mode can be that the main screen and the sub-screen display the picture corresponding to the same video signal, or the main screen and the sub-screen display the pictures corresponding to different video signals. The display mode can be set in advance, or it can be automatically set by the main control module according to the current usage scenario. Exemplarily, in the scenario of online teaching, the main control module can generate two video signals, wherein the first video signal includes image information of the screen content explained by the lecturer, and the second video signal includes image information of the lecturer's own screen. After the main control module determines that the display mode in the online teaching scenario is to display the first video signal on the main screen and the second video signal on the sub-screen, the two video signals can be distributed, and the first video signal is distributed to the first signal processing module of the main screen through the video signal transmission interface, and the second video signal is distributed to the second signal processing module of the sub-screen through the video signal transmission interface. The specific process is as follows Figure 2 shown.

[0035] The first signal processing module is used to store the first display screen identification code, and to receive the video signal, and drive the main screen to display the corresponding picture according to the video signal.

[0036] In this embodiment, the first signal processing module is used to store the first display screen identification code, and is used to drive the main screen to display a picture corresponding to the video signal after receiving the video signal assigned by the main control module through the video signal transmission interface. Exemplarily, the main screen also includes a display component, such as a TCON (Timer Control Register, timer / counter control register, also known as a logic board) module and a display panel, etc. After receiving the video signal, the main screen transmits the video signal to the TCON module, and the TCON module converts the video signal into an image signal that can be displayed by the display panel, and then displays the image signal on the display panel.

[0037] The second signal processing module is used to store the second display screen identification code, and to receive the video signal, and drive the auxiliary screen to display the corresponding picture according to the video signal.

[0038] Similarly, the function of the second signal processing module in this embodiment is similar to that of the first signal processing module. For details, reference may be made to the above description of the first signal processing module, which will not be repeated in this embodiment.

[0039] As mentioned above, an embodiment of the present invention provides a multi-screen blackboard, which includes a main screen and at least one sub-screen, wherein the main screen includes a main control module and a first signal processing module, and the sub-screen includes a second signal processing module, and the main control module is connected to the first signal processing module and the second signal processing module through a video signal transmission interface, and the main control module determines the main screen and the sub-screen according to the first display screen identification code of the first signal processing module and the second display screen identification code of the second signal processing module. After the main control module generates at least one video signal, the main control module can distribute the video signal to the first signal processing module and the second signal processing module according to the display mode, so that the main screen and the sub-screen display corresponding pictures. The multi-screen blackboard provided in this embodiment can display content in each screen according to usage requirements, expand the area used for content display, and solve the technical problem of the limited content display area of ​​the smart blackboard in the prior art.

[0040] Based on the above embodiment, the main screen also includes a first touch control module, which is connected to the first signal processing module. The main control module is also connected to the first signal processing module through a data transmission interface. The first touch control module or the first signal processing module stores a first device identification code.

[0041] In one embodiment, Figure 3 As shown, the main screen also includes a first touch module 13, wherein the first touch module 13 is used to implement the touch function of the main screen 1. For example, the first touch module 13 can be a touch panel, and the touch panel can be a component that supports infrared touch, electromagnetic touch, capacitive touch or resistive touch, etc. The specific structure of the touch panel can be set according to actual needs. Figure 3 The first touch control module 13 is connected to the first signal processing module 12 through the main circuit board 1, and data can be transmitted between the first touch control module 13 and the first signal processing module 12. In addition, in this embodiment, the main control module 10 is also connected to the first signal processing module 12 through a data transmission interface 14, wherein the data transmission interface is used to implement the data transmission function. For example, the main control module and the main board circuit can be connected through a pluggable data transmission interface. Figure 3In the embodiment, the data transmission interface 14 can also be multiplexed as a video signal transmission interface. The data transmission interface 14 has the function of transmitting video signals. The main control module 10 can transmit video signals to the first signal processing module 12 through the data transmission interface 14, and there is no need to set up an additional video signal transmission interface. In addition, the data transmission interface also has a power supply function, and the main control module can be powered by the mainboard circuit through the data transmission interface. In addition, in this embodiment, the first touch module or the first signal processing module stores the first device identification code of the first touch module, wherein the device identification code is used to distinguish different touch devices. Exemplarily, when the first touch module is a USB device, the first device identification code of the first touch module is a VID code and a PID code, wherein VID is a Vender ID, a vendor identification code, and PID is a Product ID, a product identification code. Each USB device has a VID code and a PID code. The values ​​of the VID code and the PID code serve as the unique identifier of the USB device. The VID of each vendor is unique, and the PID is determined by the vendor. In this embodiment, the first device identification code of the first touch control module can be pre-stored in the first touch control module, and can also be pre-stored in the first signal processing module. The user can set it according to actual needs, and it is not specifically limited in this embodiment.

[0042] The first touch module is used for generating a first touch signal in response to a first touch operation and transmitting the first touch signal to the first signal processing module.

[0043] In this embodiment, the first touch control module is used to detect a first touch control operation, wherein the first touch control operation refers to an operation performed by a user on the first touch control module. For example, when the first touch control module is a touch panel, the first touch control operation may be an operation such as pressing or sliding on the touch panel. After detecting the first touch control operation, the first touch control module responds to the first touch control operation and generates a first touch control signal corresponding to the first touch control operation, wherein the first touch control signal includes relevant information of the first touch control operation. Thereafter, the first touch control module transmits the first touch control signal to the first signal processing module, so that the main screen can provide visual output related to the first touch control operation.

[0044] The first signal processing module is also used to obtain the stored first device identification code or obtain the first device identification code from the first touch module, and forward the first device identification code to the main control module through the data transmission interface; and to forward the first touch signal to the main control module through the data transmission interface.

[0045] In this embodiment, after the first touch control module is connected to the first signal processing module, when the first device identification code of the first touch control module is stored in the first touch control module, the first signal processing module will obtain the first device identification code from the first touch control module. Exemplarily, after the first touch control module is connected to the first signal processing module, the first signal processing module will send an inquiry instruction to the first touch control module to inquire about the type of the first touch control module, etc. After receiving the inquiry instruction, the first touch control device will reply relevant information to the first signal processing module, and report the first device identification code to the first signal processing module at the same time, and the first signal processing module receives the first device identification code sent by the first touch control module. In addition, when the first device identification code of the first touch control module is stored in the first signal processing module, the first signal processing module directly obtains the stored first device identification code from itself. After obtaining the first device identification code, the first signal processing module transmits the first device identification code to the main control module through the data transmission interface. In addition, the first signal processing module is also used to transmit the first touch signal to the main control module through the data transmission interface after receiving the first touch signal transmitted by the first touch control module.

[0046] The main control module is also used to receive a first device identification code to determine a first touch control module corresponding to the main screen; and to receive a first touch control signal to update a video signal of the main screen according to the first touch control signal.

[0047] In this embodiment, the main control module is used to receive the first device identification code sent by the first signal processing module, and determine the first touch control module corresponding to the main screen according to the first device identification code. In one embodiment, the first device identification information of the first touch control module is pre-stored in the main control module, and the first device identification information is bound to the main screen. After the main control module obtains the device identification, it can compare the device identification with the pre-stored device identification, and determine the first touch control module corresponding to the main screen according to the comparison result. After the main control module receives the first touch signal corresponding to the first touch control module, the main control module can determine the main screen corresponding to the first touch signal, and after updating the video signal corresponding to the main screen according to the touch signal, send the updated video signal to the first signal processing module, so that the main screen can display the screen content corresponding to the first touch operation.

[0048] As described above, in the embodiment of the present invention, by setting the first touch control module in the main screen, the main control module can determine the first touch control module corresponding to the main screen according to the first device identification code of the first touch control module. Afterwards, when the first touch control module generates the first touch control signal according to the first touch control operation, the first signal processing module forwards the first touch control signal to the main control module, so that the main control module can control the main screen to provide visual output related to the first touch control operation according to the first touch control signal, thereby realizing the touch control function of the main screen, so that the main screen can realize functions such as writing and blackboard writing.

[0049] Based on the above embodiment, the main screen also includes at least one first interface module, which is connected to the first signal processing module; the sub-screen also includes a second touch module and a second interface module, both of which are connected to the second signal processing module, and each first interface module is also connected to a different second interface module, and the second touch module or the second signal processing module stores a second device identification code.

[0050] In one embodiment, the main screen further includes at least one first interface module, and the number of the first interface modules corresponds to the number of the secondary screens, for example Figure 4 As shown, when there is only one slave screen 2, the main screen 1 includes a first interface module 15. In this embodiment, the first interface module is used to connect with external devices or modules, and the interface type of the first interface module can be set according to actual needs, for example, the interface type of the first interface module can be a USB interface. Figure 4 In the embodiment, the first interface module 15 is connected to the first signal processing module 12 through the main circuit board 11. In addition, the second touch module 23 and the second interface module 24 are also provided in the auxiliary screen 2. The second touch module 23 and the second interface module 24 are connected to the second signal processing module 22 through the auxiliary circuit board 21. The function of the second interface module is the same as that of the first interface module, and both are used to connect to external devices. In this embodiment, a first interface module in the main screen is connected to the second interface modules in different auxiliary screens, thereby connecting the main screen and each auxiliary screen, so that data can be transmitted between the first signal processing module and the second signal processing module in each auxiliary screen. In addition, in this embodiment, the second device identification code is stored in the second touch module or the second signal processing module.

[0051] The second touch control module is used for generating a second touch control signal in response to a touch control operation and transmitting the second touch control signal to the second signal processing module.

[0052] In this embodiment, the function of the second touch module on the auxiliary screen is the same as that of the first touch module. For details, please refer to the above description of the first touch module, which will not be repeated in this embodiment.

[0053] The second signal processing module is used to obtain the stored second device identification code or obtain the second device identification code from the second touch module, and forward the second device identification code to the first signal processing module through the second interface module, and forward the second touch signal to the first signal processing module.

[0054] In this embodiment, after the second touch control module is connected to the second signal processing module, the second signal processing module will obtain the second device identification code from the second touch control module, or obtain the second device identification code stored locally. After the second signal processing module obtains the second device identification code, it transmits the second device identification code to the first signal processing module through the second interface module and the first interface module. In addition, the second signal processing module is also used to transmit the second device identification code to the first signal processing module through the second interface module and the first interface module after receiving the second touch signal transmitted by the second touch control module.

[0055] The first signal processing module is used for forwarding the second device identification code to the main control module through the data transmission interface; and for forwarding the second touch signal to the main control module through the data transmission interface.

[0056] In this embodiment, after the first signal processing module receives the second device identification code through the first interface module, it transmits the second device identification code to the main control module through the data transmission interface. Similarly, after the first signal processing module receives the second touch signal through the first interface module, it also forwards the second touch signal to the main control module.

[0057] The main control module is also used to receive a second device identification code to determine a second touch control module corresponding to the slave screen; and to receive a second touch control signal to update the video signal of the slave screen according to the second touch control signal.

[0058] After receiving the second device identification code, the main control module can determine the second touch control module corresponding to the secondary screen according to the second device identification code; similarly, after receiving the second touch signal, the main control module updates the video signal of the secondary screen according to the second touch signal. The process of the main control module determining the second touch control module corresponding to the secondary screen and updating the video signal of the secondary screen is similar to the process of determining the first touch control module corresponding to the main screen and updating the video signal of the main screen. For the specific process, please refer to the above description.

[0059] As described above, the embodiment of the present invention sets a first interface module and a second interface module in the main screen and the sub-screen respectively, the first interface module and the second interface module are connected, and a second touch module is also set in the sub-screen. The data generated by the second touch module can be transmitted to the main control module of the main screen through the second interface module and the first interface module, so that the main control module can determine the second touch module corresponding to the sub-screen according to the second device identification code of the second touch module. Afterwards, when the second touch module generates a second touch signal according to the second touch operation, the main control module can also control the sub-screen to provide visual output related to the second touch operation according to the second touch signal, thereby realizing the touch function of the sub-screen, so that the sub-screen can realize functions such as writing and blackboard writing.

[0060] On the basis of the above embodiment, it also includes a peripheral connection module, which is connected to the first signal processing module or the second interface module of the auxiliary screen.

[0061] The peripheral device connection module is used to connect with at least one type of external device, receive an external signal transmitted by the external device, and determine a target object according to a source of the external signal.

[0062] In one embodiment, the multi-screen blackboard further includes a peripheral device connection module, wherein the peripheral device connection module can be connected to the first signal processing module, and can also be connected to the second interface module of the secondary screen. Figure 5 As shown, Figure 5 It is a schematic diagram of the connection between the external device connection module 25 and the second interface module 24 of the secondary screen 2. In this embodiment, the external device connection module is used to connect to at least one type of external device, wherein the external device refers to a device connected to the outside of the multi-screen blackboard, and the type of the external device can be set according to actual needs. In one embodiment, a plurality of interfaces are provided on the external connection module, such as a USB interface, an HDMI interface, and a Type-C (a USB interface appearance standard) interface, etc., so that the external connection module can be connected to different types of devices such as USB devices, HDMI devices, and Type-C devices.

[0063] After the peripheral connection module is connected to the external device, it can receive the external signal transmitted by the external device. Since there are many types of external devices, the peripheral connection module needs to first determine the source of the external signal, that is, determine the external device that sends the external signal, and determine the target object to which the external signal needs to be transmitted based on the source of the external signal. For example, when the source of the external signal is a USB device, then it can be determined that the object to which the external signal needs to be transmitted is the main control module, and when the source of the external signal is an HDMI device or a Type-C device, then it can be determined that the object to which the external signal needs to be transmitted is the first signal processing module of the main screen.

[0064] And when the target object is the main control module, the external signal is forwarded to the first signal processing module through the connected second interface module, or the external signal is directly sent to the first signal processing module, so that the first signal processing module forwards the external signal to the main control module for processing.

[0065] After determining that the target object is the main control module, when the peripheral connection module is connected to the second interface module, the peripheral connection module transmits the external signal to the first interface module through the second interface module, and after the first interface module transmits the external signal to the first signal processing module, the first signal processing module forwards the external signal to the main control module, so that the main control signal processes the external signal. When the peripheral connection module is connected to the first signal processing module, the peripheral connection module transmits the external signal to the first signal processing module, and then the first signal processing module forwards the external signal to the main control module, so that the main control signal processes the external signal. For example, the external signal transmitted by the USB device can be configuration data including the configuration of the parameters of the multi-screen blackboard. After the main control module parses the external signal, the multi-screen blackboard can be configured according to the configuration data. Or the external signal includes an access request of the USB device, and the main control module can access and control the USB device according to the external signal, so that the multi-screen blackboard can use the function of the USB device.

[0066] And when the target object is the first signal processing module, the external signal is forwarded to the first signal processing module through the connected second interface module, or the external signal is directly sent to the first signal processing module, so that the first signal processing module processes the external signal.

[0067] In addition, when the target object is the first signal processing module, if the peripheral connection module is connected to the second interface module, the peripheral connection module transmits the external signal to the first interface module through the second interface module, and after the first interface module transmits the external signal to the first signal processing module, the first signal processing module processes the external signal. When the peripheral connection module is connected to the first signal processing module, the peripheral connection module transmits the external signal to the first signal processing module so that the first signal processing module processes the external signal. Exemplarily, when the external signal transmitted by the external HDMI device is a video signal, the first signal processing module can drive the main screen to display a video screen corresponding to the video signal.

[0068] In another embodiment, when the external device can also be directly connected to the second signal processing module of the secondary screen, the external device can directly transmit the external signal to the second signal processing module of the secondary screen for processing. The specific processing process is similar to the processing process of the external signal by the first signal processing module, and will not be repeated in this embodiment.

[0069] As mentioned above, the multi-screen blackboard provided by the embodiment of the present invention also includes a peripheral connection module, through which the multi-screen blackboard can be connected to different types of external devices, receive external signals transmitted by the external devices and process the external signals. The embodiment of the present invention enables the multi-screen blackboard to interact with external devices by setting the peripheral connection module, and at the same time can expand the functions of the multi-screen blackboard and improve the scalability of the multi-screen blackboard.

[0070] On the basis of the above embodiment, it also includes a key module, which is connected to the first signal processing module or the second interface module of the auxiliary screen.

[0071] The key module is used to generate a key signal and forward the key signal to the first signal processing module through the connected second interface module, or directly send the key signal to the first signal processing module so that the first signal processing module processes the key signal.

[0072] In one embodiment, the multi-screen blackboard further includes a key module, which refers to a module provided with keys, and the user can trigger the key module to generate a key signal by pressing the key. In addition, in this embodiment, the key module can be connected to the first signal processing module, and can also be connected to the second interface module of the secondary screen. Figure 6 As shown, when the key module 26 is connected to the second interface module 25, the key module 26 transmits the key signal to the first interface module 15 through the second interface module 24. After the first interface module 15 transmits the key signal to the first signal processing module 12, the first signal processing module processes the key signal. When the key module is connected to the first signal processing module, the key module directly inputs the key signal to the first signal processing module, and the first signal processing module processes the key signal. Exemplarily, the first signal processing module is also connected to the speaker, and the key signal is a signal for adjusting the volume. After receiving the key signal, the main control module can adjust the volume of the speaker according to the key signal; or, the key signal is a power-on signal. After receiving the key signal, the first signal processing module executes the power-on process.

[0073] As described above, in the embodiment of the present invention, a key module is provided in the multi-screen blackboard. After the key module sends the key signal to the first signal processing module, the first signal processing module can process the key signal, thereby performing an operation corresponding to the key signal. In this embodiment, by providing the key module, the user can control the multi-screen blackboard by operating the key, thereby improving the convenience of the user controlling the multi-screen blackboard.

[0074] Based on the above embodiment, the main circuit board also includes a first power conversion module, the sub-circuit board also includes a second power conversion module, the first power conversion module is connected to the second power conversion module, the first signal processing module is connected to the first power conversion module, and the main control module is also connected to the first signal processing module through a data transmission interface.

[0075] In one embodiment, if Figure 7 As shown, the main circuit board 11 of the main screen 1 also includes a first power conversion module 16, and the sub-circuit board 21 of the sub-screen 2 also includes a second power conversion module 27, wherein the first power conversion module 16 is connected to the second power conversion module 27, the first signal processing module 12 is also connected to the first power conversion module 16 through the main circuit board 11, the main control module 10 is also connected to the first signal processing module 12 through the data transmission interface 14, and the first power conversion module 16 is also connected to the external power supply 3.

[0076] The first power conversion module is used to connect to an external voltage source, receive the first electric energy output by the external voltage source, and convert the first electric energy into the first target electric energy to power the main circuit board and the main control module; and is used to receive the power supply instruction of the first signal processing module and output the first electric energy to the second power conversion module.

[0077] In this embodiment, the first power conversion module is used to connect with an external voltage source to receive the first electric energy output by the external voltage source, wherein the external voltage source refers to a device for outputting electric energy outside the multi-screen blackboard, and the external voltage source can be a variable voltage source, or a fixed direct current (DC) or alternating current (AC) voltage source. In this embodiment, the external voltage source is used to power the multi-screen blackboard. After receiving the first electric energy, the first power conversion module can convert the first electric energy into the first target electric energy that can be used by the main circuit board, and then power the main circuit board, so that the main circuit board can power the functional module (such as the first signal processing module) set on its board body. In addition, since the main control module is also connected to the first signal processing module through a data transmission interface, the main circuit board can also power the main control module through the data transmission interface. In addition, in this embodiment, the first power conversion module is also used to receive the power supply instruction sent by the first signal processing module, and after receiving the power supply instruction, the first electric energy is output to the second power conversion module, thereby powering the auxiliary screen. Exemplarily, a relay is provided on the first power conversion module, and the first signal processing module can control whether the first power conversion module supplies power to the second power conversion module of the auxiliary screen by controlling the on and off of the relay.

[0078] The first signal processing module is further used to output a power supply instruction to the first power conversion module after power-on startup.

[0079] In this embodiment, after the main circuit board supplies power to the first signal processing module so that the first signal processing module is powered on and started, the first signal processing module will also output a power supply instruction to the first power conversion module, wherein the power supply instruction is used to instruct the first power conversion module to power the secondary screen.

[0080] The second power conversion module is used to receive the first electric energy output by the first power conversion module, and convert the first electric energy into second target electric energy to supply power to the auxiliary circuit board.

[0081] After receiving the first electric energy output by the first power conversion module, the second power conversion module converts the first electric energy into the second target electric energy that can be used by the auxiliary circuit board, and then supplies power to the auxiliary circuit board, so that the auxiliary circuit board can supply power to the functional module (such as the second signal processing module) arranged on the board body. When the specifications of the main circuit board and the auxiliary circuit board are the same, the first target electric energy is the same as the second target electric energy.

[0082] As mentioned above, the embodiment of the present invention sets a first power conversion module on the main circuit board, sets a second power conversion module on the auxiliary circuit board, and connects the first power conversion module with the second power conversion module, so that after receiving the electric energy output by the external voltage source, the first power conversion module can supply power to the main circuit board and the second power conversion module, and the second power conversion module can also supply power to the auxiliary circuit board, thereby ensuring the normal operation of the multi-screen blackboard. At the same time, the multi-screen blackboard only needs to be connected to an external voltage source, thereby reducing the wiring between the multi-screen blackboard and the outside and simplifying the installation steps.

[0083] On the basis of the above embodiment, the main circuit board also includes a first power conversion module, the sub-circuit board also includes a second power conversion module, the external voltage source is connected to the target second power conversion module of any target sub-circuit board in the sub-circuit boards, the target second power conversion module is connected to the first power conversion module and the second power conversion modules on other sub-circuit boards; the target second signal processing module of the target sub-circuit board is connected to the target second power conversion module, and the main control module is also connected to the first signal processing module through a data transmission interface;

[0084] The target second power conversion module is used to receive the first electric energy output by the external voltage source, and convert the first electric energy into the second target electric energy to power the target auxiliary circuit board; and is used to receive the power supply instruction of the target second signal processing module, and output the first electric energy to the first power conversion module and the second power conversion modules on the other auxiliary circuit boards;

[0085] The target second signal processing module is also used to output a power supply instruction to the target second power conversion module after power-on startup;

[0086] The first power conversion module is used to receive the first electric energy output by the target second power conversion module, and convert the first electric energy into the first target electric energy to supply power to the main circuit board and the main control module;

[0087] The second power conversion modules on other auxiliary circuit boards are used to receive the first electric energy output by the target second power conversion module, and convert the first electric energy into the second target electric energy to supply power to the auxiliary circuit boards.

[0088] In another embodiment, the external voltage source is connected to the target second power conversion module of any target sub-circuit board in the sub-circuit boards, the second signal processing module of the target sub-circuit board is connected to the target second power conversion module, and the target second power conversion module is connected to the first power conversion module and the second power conversion modules on other sub-circuit boards. In the case of only one sub-screen, the connection method is as follows Figure 8 shown.

[0089] In this embodiment, after the target second power conversion module receives the first electric energy output by the external voltage source, it converts the first electric energy into the second target electric energy that can be used by the target sub-circuit board, and then supplies power to the target sub-circuit board, so that the target sub-circuit board can supply power to the functional modules (such as the target second signal processing module) set on its board body. After the target second signal processing module of the target sub-circuit board is powered on and started, it outputs a power supply instruction to the target second power conversion module, so that the target second power conversion module supplies power to the main screen and other sub-screens, and outputs the first electric energy to the first power conversion module and the second power conversion modules on the other sub-circuit boards. After receiving the first electric energy, the first power conversion module of the main screen and the second power conversion modules on the other sub-circuit boards convert the first electric energy and supply power to the main screen and other sub-screens respectively, so that the main screen and other sub-screens can be started normally.

[0090] As mentioned above, the embodiment of the present invention is provided with a first power conversion module on the main circuit board, a second power conversion module on the auxiliary circuit board, an external voltage source is connected to the target second power conversion module of any target auxiliary circuit board in the auxiliary circuit board, and the target second power conversion module is connected to the first power conversion module and the second power conversion modules on other auxiliary circuit boards. After the target second power conversion module receives the electric energy output by the external voltage source and is powered on and started, it supplies power to the target auxiliary circuit board, and after the target auxiliary circuit board is powered on, it controls the target second power conversion module to supply power to the main screen and other auxiliary screens, thereby ensuring the normal operation of the multi-screen blackboard. At the same time, the multi-screen blackboard only needs to be connected to an external voltage source, thereby reducing the wiring between the multi-screen blackboard and the outside and simplifying the installation steps.

[0091] Based on the above embodiment, the main control module, the first signal processing module and the second signal processing module are also connected through a network, and the main control module, the first signal processing module and the second signal processing module are also used to communicate with each other through the network.

[0092] In one embodiment, the main control module, the first signal processing module and the second signal processing module are also connected via a network. Fig. 9 As shown, the main control module, the first signal processing module and the second signal processing module can be connected to the network switch through network signals. The main control module, the first signal processing module and the second signal processing module respectively use fixed IP addresses of the same network segment and communicate with each other through the network, thereby facilitating data transmission between each other.

[0093] As mentioned above, in the embodiment of the present invention, the main control module, the first signal processing module and the second signal processing module are also connected through a network, so that the main control module, the first signal processing module and the second signal processing module can communicate with each other through the network, further improving the data transmission efficiency.

[0094] Based on the above embodiment, the main circuit board also includes a first backlight driving module, and the first signal processing module is also connected to the first backlight driving module; the auxiliary circuit board also includes a second backlight driving module, and the second signal processing module is also connected to the second backlight driving module.

[0095] In one embodiment, if Fig.10 As shown, the main circuit board 11 further includes a first backlight driver module 17, and the first signal processing module 12 is connected to the first backlight driver module 17; the auxiliary circuit board 21 further includes a second backlight driver module 28, and the second signal processing module 22 is also connected to the second backlight driver module 28. The backlight driver module refers to a module for adjusting the backlight brightness of the screen, and the first backlight driver and the second backlight driver module are respectively the backlight driver module on the main circuit board and the backlight driver module on the auxiliary circuit board.

[0096] The main control module is further used to send a backlight adjustment instruction to the first signal processing module and the second signal processing module in response to the backlight control instruction.

[0097] The first signal processing module is further used to control the first backlight driving module to adjust the backlight brightness value of the main screen according to the backlight adjustment instruction.

[0098] The second signal processing module is also used to control the second backlight driving module to adjust the backlight brightness value of the auxiliary screen according to the backlight adjustment instruction.

[0099] In this embodiment, when the user wants to adjust the backlight brightness of the multi-screen blackboard, a backlight control instruction can be sent to the main control module, and the backlight control instruction is used to adjust the backlight brightness of the multi-screen blackboard. The way in which the user sends the backlight control instruction can be set according to actual needs, for example, the backlight control instruction can be sent to the main control module through the network, or the user can open the backlight adjustment interface on the main screen, and adjust the backlight brightness value by operating the backlight adjustment interface to send the backlight control instruction to the main control module.

[0100] After receiving the backlight control instruction, the main control module responds to the backlight control instruction, determines the target backlight brightness value required by the user according to the backlight control instruction, generates a backlight adjustment instruction according to the target backlight brightness value, and sends the backlight adjustment instruction to the first signal processing module and the second signal processing module through the network. After receiving the backlight adjustment instruction, the first signal processing module determines the target backlight brightness value and controls the first backlight driving module to adjust the backlight brightness value of the main screen to the target backlight brightness value. The process of the second signal processing module adjusting the backlight brightness value of the secondary screen according to the backlight adjustment instruction is similar to the process of adjusting the backlight brightness value of the main screen, and will not be repeated in this embodiment.

[0101] As described above, in the embodiment of the present invention, the first backlight driving module and the second backlight driving module are respectively arranged on the main circuit board and the sub-circuit board, and the first signal processing module is also connected to the first backlight driving module, and the second signal processing module is also connected to the second backlight driving module. After the user sends a backlight control instruction to the main control module, the main control module can send a backlight adjustment instruction to the first signal processing module and the second signal processing module, and the first signal processing module and the second signal processing module can adjust the backlight brightness value of the main screen and the backlight brightness value of the sub-screen by controlling the first backlight driving module and the second backlight driving module respectively.

[0102] Based on the above embodiment, the main screen further includes a first TCON module, the first signal processing module is further connected to the first TCON module, the sub-screen further includes a second TCON module, and the second signal processing module is further connected to the second TCON module.

[0103] The first signal processing module is used to receive the first video signal sent by the main control module, and send the first video signal to the first TCON module;

[0104] The first TCON module is used for converting the first video signal into a first low voltage differential signal for driving the main screen, so that the main screen displays the content corresponding to the first video signal;

[0105] The second signal processing module is used for receiving the second video signal sent by the main control module, and sending the second video signal to the second TCON module;

[0106] The second TCON module is used to convert the second video signal into a second low voltage differential signal for driving the slave screen, so that the slave screen displays content corresponding to the second video signal.

[0107] In one embodiment, if Fig.12 As shown, the main screen 1 includes a first TCON module 18, and the first signal processing module 12 is also connected to the first TCON module 18 through the main circuit board 11. The auxiliary screen 2 also includes a second TCON module 29, and the second signal processing module 22 is also connected to the second TCON module 29 through the auxiliary circuit board 21. The TCON module refers to a module including a TCON, which is also called a logic board, a screen driver board or a central control board. The function of the logic board is to process the input video signal (including three types of signals: RGB data signal, clock signal, and control signal) and convert it into an LVDS (Low-Voltage Differential Signaling) signal that can drive the display panel, and then directly send it to the LVDS receiving chip of the display panel, so that the display panel can display the content corresponding to the video signal. The core of the LVDS technology is to use extremely low voltage swing high-speed differential transmission data, which can realize point-to-point or point-to-multipoint connection.

[0108] In this embodiment, after the main control module sends the first video signal to the first signal processing module through the video signal transmission interface, the first signal processing module forwards the first video signal to the first TCON module. The first TCON module converts the first video signal. After converting the video signal into a first LVDS signal, the first LVDS signal is input into the display panel of the main screen to drive the display panel of the main screen to display the content corresponding to the first video signal. Similarly, the process of displaying the content corresponding to the second video signal on the sub-screen is similar to that of the main screen. In one embodiment, the first signal processing module is connected to the first TCON module via VBO, and the second signal processing module is connected to the second TCON module via VBO (V-by-One, a Gb-level serial interface technology dedicated to video signal transmission). The path for transmitting the video signal is as follows: Fig.13 shown.

[0109] In one embodiment, the multi-screen blackboard includes a main screen and two sub-screens, and the two sub-screens are respectively arranged on both sides of the main screen. Fig.14 As shown. Fig.14In the embodiment, the external voltage source 3 is connected to the first power conversion module 16 of the main screen 1. After the external voltage source 3 supplies power to the main circuit board 11, the first signal processing module 12 and the main control module 10 are powered on and started. The first signal processing module 12 controls the first power conversion module 16 to supply power to the second power conversion module 27 of the auxiliary screen 2 and the second power conversion module 43 of the auxiliary screen 4, respectively, so as to start the two auxiliary screens. After the auxiliary screen 2 and the auxiliary screen 4 are powered on and started, the main control module 10 obtains the EDID of the main screen 1 and the EDID of the auxiliary screen 2 and the auxiliary screen 4 through the video signal transmission interface 14, and determines the auxiliary screen 2 on the left, the main screen 1, and the auxiliary screen 4 on the right according to the EDID. After that, the main control module 10 further obtains the VID / PID of the first touch control module 13 of the main screen 1, the VID / PID of the second touch control module 23 of the auxiliary screen 2, and the VID / PID of the second touch control module 44 of the auxiliary screen 4, and determines the touch control modules corresponding to the main screen 1, the auxiliary screen 2, and the auxiliary screen 4 according to the VID / PID.

[0110] After receiving at least one video signal, the main control module 10 can further distribute the at least one video signal to the first signal processing module 12 of the main screen 1, the second signal processing module 22 of the sub-screen 2 and the second signal processing module 42 of the sub-screen 4 through the video signal transmission interface according to the display modes of the main screen 1, the sub-screen 2 and the sub-screen 4, so that the first signal processing module 12 drives the main screen 1 to display the corresponding picture through the first TCON module 18, the second signal processing module 22 of the sub-screen 2 drives the sub-screen 2 to display the corresponding picture through the second TCON module 29, and the second signal processing module 42 of the sub-screen 4 drives the sub-screen 4 to display the corresponding picture through the second TCON module 46. In addition, when the user needs to adjust the backlight brightness of the multi-screen blackboard, the backlight control instruction can be sent to the main control module 10, and the main control module 10 sends the backlight adjustment instruction to the first signal processing module 12, the second signal processing module 22 and the second signal processing module 42 through the network, so as to adjust the backlight brightness values ​​of the main screen 1, the sub-screen 2 and the sub-screen 4.

[0111] The multi-screen blackboard provided in this embodiment can display content on each screen according to usage requirements, expand the area used for content display, and solve the technical problem of limited content display area in the smart blackboard in the prior art.

[0112] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the embodiments of the present invention are not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the embodiments of the present invention. Therefore, although the embodiments of the present invention are described in more detail through the above embodiments, the embodiments of the present invention are not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the embodiments of the present invention, and the scope of the embodiments of the present invention is determined by the scope of the appended claims.

Claims

1. A multi-screen blackboard, comprising a main screen and at least one secondary screen, characterized in that: The main screen includes a main control module and a main circuit board, and the main circuit board includes a first signal processing module; the auxiliary screen includes an auxiliary circuit board, and the auxiliary circuit board includes a second signal processing module; the main control module is connected to the first signal processing module and the second signal processing module through a video signal transmission interface; The main control module is used to obtain the first display screen identification code and the second display screen identification code from the first signal processing module and the second signal processing module respectively through the video signal transmission interface, and determine the main screen and the sub-screen according to the first display screen identification code and the second display screen identification code; and is used to generate at least one video signal, and distribute the at least one video signal to the first signal processing module and the second signal processing module according to the display modes of the main screen and the sub-screen; The first signal processing module is used to store the first display screen identification code, and to receive the video signal, and drive the main screen to display a corresponding picture according to the video signal; The second signal processing module is used to store the second display screen identification code, and to receive the video signal, and drive the auxiliary screen to display a corresponding picture according to the video signal.

2. A multi-screen blackboard according to claim 1, characterized in that: The main screen further includes a first touch control module, the first touch control module is connected to the first signal processing module, the main control module is further connected to the first signal processing module via a data transmission interface, and the first touch control module or the first signal processing module stores a first device identification code; The first touch control module is used for generating a first touch control signal in response to a first touch control operation and transmitting the first touch control signal to the first signal processing module; The first signal processing module is further used to obtain the stored first device identification code or obtain the first device identification code from the first touch control module, and forward the first device identification code to the main control module through the data transmission interface; and forward the first touch signal to the main control module through the data transmission interface; The main control module is further used to receive the first device identification code and determine the first touch control module corresponding to the main screen; And used for receiving the first touch signal, and updating the video signal of the main screen according to the first touch signal.

3. A multi-screen blackboard according to claim 2, characterized in that: The main screen further includes at least one first interface module, which is connected to the first signal processing module; the secondary screen further includes a second touch control module and a second interface module, which are both connected to the second signal processing module, and each of the first interface modules is also connected to a different second interface module, and the second touch control module or the second signal processing module stores a second device identification code; The second touch control module is used for generating a second touch control signal in response to a touch control operation and transmitting the second touch control signal to the second signal processing module; The second signal processing module is used to obtain the stored second device identification code or obtain the second device identification code from the second touch module, and forward the second device identification code to the first signal processing module through the second interface module, and to forward the second touch signal to the first signal processing module; The first signal processing module is used to forward the second device identification code to the main control module through the data transmission interface; and is used to forward the second touch signal to the main control module through the data transmission interface; The main control module is further used to receive the second device identification code and determine the second touch control module corresponding to the slave screen; and to receive the second touch control signal and update the video signal of the slave screen according to the second touch control signal.

4. A multi-screen blackboard according to claim 3, characterized in that: It also includes a peripheral connection module, which is connected to the first signal processing module or the second interface module of the secondary screen; The peripheral device connection module is used to connect to at least one type of external device, receive an external signal transmitted by the external device, and determine a target object according to a source of the external signal; and used for, when the target object is the main control module, forwarding the external signal to the first signal processing module through the connected second interface module, or directly sending the external signal to the first signal processing module, so that the first signal processing module forwards the external signal to the main control module for processing; And when the target object is the first signal processing module, forwarding the external signal to the first signal processing module through the connected second interface module, or directly sending the external signal to the first signal processing module, so that the first signal processing module processes the external signal.

5. A multi-screen blackboard according to claim 3, characterized in that: It also includes a key module, which is connected to the first signal processing module or the second interface module of the secondary screen; The key module is used to generate a key signal, and forward the key signal to the first signal processing module through the connected second interface module, or directly send the key signal to the first signal processing module, so that the first signal processing module processes the key signal.

6. A multi-screen blackboard according to claim 1, characterized in that: The main circuit board also includes a first power conversion module, the auxiliary circuit board also includes a second power conversion module, the first power conversion module is connected to the second power conversion module, the first signal processing module is connected to the first power conversion module, and the main control module is also connected to the first signal processing module through a data transmission interface; The first power conversion module is used to connect to an external voltage source, receive the first electric energy output by the external voltage source, and convert the first electric energy into the first target electric energy to supply power to the main circuit board and the main control module; and receiving a power supply instruction from the first signal processing module, and outputting the first electric energy to the second power conversion module; The first signal processing module is further used to output the power supply instruction to the first power conversion module after power-on startup; The second power conversion module is used to receive the first electric energy output by the first power conversion module, and convert the first electric energy into second target electric energy to supply power to the auxiliary circuit board.

7. A multi-screen blackboard according to claim 1, characterized in that: The main circuit board also includes a first power conversion module, the sub-circuit board also includes a second power conversion module, an external voltage source is connected to a target second power conversion module of any target sub-circuit board in the sub-circuit boards, and the target second power conversion module is connected to the first power conversion module and the second power conversion modules on other sub-circuit boards; the target second signal processing module of the target sub-circuit board is connected to the target second power conversion module, and the main control module is also connected to the first signal processing module through a data transmission interface; The target second power conversion module is used to receive the first electric energy output by the external voltage source, and convert the first electric energy into the second target electric energy to supply power to the target auxiliary circuit board; and for receiving a power supply instruction of the target second signal processing module, and outputting the first electric energy to the first power conversion module and the second power conversion modules on the other auxiliary circuit boards; The target second signal processing module is further used to output the power supply instruction to the target second power conversion module after power-on startup; The first power conversion module is used to receive the first electric energy output by the target second power conversion module, and convert the first electric energy into the first target electric energy to power the main circuit board and the main control module; The second power conversion module on the other auxiliary circuit board is used to receive the first electric energy output by the target second power conversion module, and convert the first electric energy into second target electric energy to power the auxiliary circuit board.

8. A multi-screen blackboard according to claim 1, characterized in that: The main control module, the first signal processing module and the second signal processing module are also connected via a network, and the main control module, the first signal processing module and the second signal processing module are also used to communicate with each other via the network.

9. A multi-screen blackboard according to claim 8, characterized in that: The main circuit board further includes a first backlight driving module, and the first signal processing module is further connected to the first backlight driving module; the auxiliary circuit board further includes a second backlight driving module, and the second signal processing module is further connected to the second backlight driving module; The main control module is further used to send a backlight adjustment instruction to the first signal processing module and the second signal processing module in response to the backlight control instruction; The first signal processing module is further used to control the first backlight driving module to adjust the backlight brightness value of the main screen according to the backlight adjustment instruction; The second signal processing module is further used to control the second backlight driving module to adjust the backlight brightness value of the secondary screen according to the backlight adjustment instruction.

10. A multi-screen blackboard according to claim 1, characterized in that: The main screen further includes a first TCON module, the first signal processing module is further connected to the first TCON module, the sub-screen further includes a second TCON module, the second signal processing module is further connected to the second TCON module; The first signal processing module is used to receive the first video signal sent by the main control module, and send the first video signal to the first TCON module; The first TCON module is used to convert the first video signal into a first low voltage differential signal for driving a main screen, so that the main screen displays the content corresponding to the first video signal; The second signal processing module is used to receive the second video signal sent by the main control module, and send the second video signal to the second TCON module; The second TCON module is used to convert the second video signal into a second low-voltage differential signal for driving the slave screen, so that the slave screen displays content corresponding to the second video signal.

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