USB communication circuit and display device

Abstract

The utility model provides a USB communication circuit and a display device. The USB communication circuit comprises a first communication management module, a second communication management module and a third communication management module. A first input end and a second input end of the first communication management module are connected with the first USB interface and the second USB interface; the first input end of the second communication management module is connected with the output end of the first communication management module; the first and second input ends of the third communication management module are connected with the third and fourth USB interfaces; and the first and second output ends of the third communication management module are connected with the second input end of the second communication management module and the fourth host. The circuit can switch channels of a plurality of USB interfaces to corresponding hosts so as to ensure the display and use reliability of the display equipment, corresponding HUB and SW do not need to be set for each external equipment, the design cost of the device is reduced, meanwhile, switching of the channels of the plurality of USB interfaces can be achieved through the second communication management module, arrangement of wiring is reduced, and the reliability of the display equipment is improved. And certain manufacturing cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of communication circuits, and more particularly, to a USB communication circuit and a display device. Background Art

[0002] With the improvement of display device performance, more USB interfaces are now integrated into display devices. For example, there are standard USB3.0-A interfaces, USB3.0-C interfaces, USB3.0-B interfaces, and USB2.0 interfaces for external use. There are also many USB2.0 interfaces and USB3.0 interfaces for internal use, such as USB2.0 microphone interfaces, USB2.0 touch interfaces, USB3.0 WIFI interfaces, etc. The external interfaces here refer to interfaces for connecting external USB devices. It can be understood that other USB devices independent of the display device can be plugged into and unplugged from the display device through these interfaces; while the internal interfaces refer to interfaces for connecting USB devices built into the display device. It can be understood that some USB devices built into the display device can be connected to the USB host of the display device through these interfaces. Currently, common display devices (for example, smart interactive tablets) are usually equipped with multiple hosts such as hosts running Android systems, PC hosts running Windows systems, and Universal Serial Bus (USB) TYPE B channels. If the connected host switches from the current host to the target host, it means that the display channel has switched. At this time, the USB device (USB interface) needs to be connected to the corresponding host according to the switching of the display channel. That is, the USB device connected to the aforementioned USB interface needs to be switched to the host running the Android system, the PC running the Windows system, and the onboard USB3.0 channel. Among them, the onboard USB3.0 port can be connected to a laptop computer through a cable. When the user performs a touch operation on the built-in touch screen of the commercial display tablet, the touch operation can be transmitted back to the laptop computer for corresponding display. At the same time, when the laptop computer serves as the host, it can be used to call the USB slave device connected to the commercial display tablet during a meeting in a conference room.

[0003] Currently, common display devices (e.g., smart interactive tablets) are typically equipped with multiple hosts, including a host running Android, a PC running Windows, and a USB Type B channel. If the connected host switches from the current host to the target host, it also means that the display channel has switched. In this case, the USB device needs to switch according to the switching of the display channel. This requires the support of a complex USB hub (USB HUB) and a universal serial bus switch (USB SW). Through the USB HUB and USB SW, the USB interface is switched to the corresponding host, allowing the USB device connected to the USB interface to switch to the corresponding target host.

[0004] In the related art, each USB interface corresponds to a USB HUB and a USB SW to implement corresponding channel switching. Multiple USB HUBs, multiple USB SWs, and the host need to be connected, which leads to complex wiring on the board and high production costs. Utility Model Content

[0005] To solve the above problems, the present application provides a USB communication circuit and display device, which aims to solve the problem of complex wiring on the board and high production cost when switching the channels of multiple USB ports to the same host.

[0006] In the first aspect, the present application provides a USB communication circuit, comprising a first communication management module, a second communication management module and a third communication management module; the first input end of the first communication management module is connected to the first USB interface, and the second input end of the first communication management module is connected to the second USB interface; the first input end of the second communication management module is connected to the output end of the first communication management module, the first output end of the second communication management module is connected to the first host, the second output end of the second communication management module is connected to the second host, and the third output end of the second communication management module is connected to the third host; the first input end of the third communication management module is connected to the third USB interface, the second input end of the third communication management module is connected to the fourth USB interface, the first output end of the third communication management module is connected to the second input end of the second communication management module, and the second output end of the third communication management module is connected to the fourth host; wherein the USB interface is a USB2.0 interface or a USB3.0 interface.

[0007] Based on the USB communication circuit of the embodiment of the present application, the channels of the four USB interfaces can be switched through three communication management modules. There is no need to set up an independent communication management module for each USB interface, which reduces the design cost of the device and thus saves a certain amount of production cost. At the same time, by controlling the second communication management module, the channels of the first USB interface, the second USB interface, the third USB interface and the fourth USB interface can be switched. There is no need for multiple communication management modules to be connected to the third host respectively, which reduces the layout of the wiring and avoids the need to connect multiple communication management modules and the host, resulting in complex wiring on the board and high production cost.

[0008] In one possible implementation, the first communication management module includes a first hub and a first switch; the first input end of the first hub is connected to the first USB interface, and the second input end of the first hub is connected to the second USB interface; the input end of the first switch is connected to the output end of the first hub, and the output end of the first switch is connected to the first input end of the second communication management module.

[0009] In this implementation, the first hub can regenerate (i.e., restore the signal quality) and amplify the signals of the first USB interface and the second USB interface so that the signals can be transmitted over a longer distance, ensuring that the data can be transmitted losslessly to the first switch. The first switch can intelligently forward the signal to the second communication management module based on the destination address of the amplified signal to ensure the reliability and security of signal transmission.

[0010] In one possible implementation, the second communication management module includes a second hub and a second switch; the first input end of the second hub is connected to the output end of the first switch, the second input end of the second hub is connected to the first output end of the third communication management module, and the output end of the second hub is connected to the third host; the first input end of the second switch is connected to the output end of the second hub, the first output end of the second switch is connected to the first host, and the second output end of the second switch is connected to the second host.

[0011] In this implementation, the signals corresponding to the first, second, third, and fourth USB interfaces are aggregated in a second hub, which regenerates and amplifies these signals. These signals are then transmitted to a second switch via its output terminals. The second switch then intelligently forwards the amplified signals to either the first or second host based on their destination addresses, ensuring reliable and secure signal transmission. Furthermore, the second hub can switch the corresponding channels of these USB interfaces to the third host, eliminating the need for an additional hub and saving significant manufacturing costs.

[0012] In a possible implementation, the second communication management module further includes a control unit, which is connected to the second input end of the second switch, and is configured to send a control signal to the second switch to control the second switch to selectively conduct.

[0013] In this implementation, a control unit is provided to switch the output channel of the second switch to improve the reliability of signal transmission.

[0014] In one possible implementation, the second communication management module further includes a switch unit, a first end of the switch unit is connected to the output end of the second hub, a second end of the switch unit is connected to the first input end of the second switch, and a controlled end of the switch unit is used to access the switch signal.

[0015] In this implementation, the on / off of the switch unit can be controlled by the switch signal to correspondingly control the on / off of the connection line between the second hub and the second switch, thereby improving the reliability of signal transmission.

[0016] In a possible implementation, the switch unit includes any one of a metal oxide semiconductor field effect transistor, an electromagnetic relay, or a triode.

[0017] In one possible implementation, the third communication management module includes a third hub and a third switch; the first input end of the third hub is connected to the third USB interface, and the second input end of the third hub is connected to the fourth USB interface; the input end of the third switch is connected to the output end of the third hub, the first output end of the third switch is connected to the second input end of the second hub, and the second output end of the third switch is connected to the fourth host.

[0018] In this implementation, the third hub can regenerate and amplify the signals of the third USB interface and the fourth USB interface so that the signals can be transmitted over a longer distance, ensuring that the data can be transmitted losslessly to the third switch. The third switch can intelligently forward the signal to the second hub or the fourth host according to the destination address of the amplified signal to ensure the reliability and security of signal transmission.

[0019] In a possible implementation, the first hub, the second hub, and the third hub are all USB hubs.

[0020] In a possible implementation, the first switch, the second switch, and the third switch are all USB 2.0 switches or USB 3.0 switches.

[0021] In a second aspect, the present application provides a display device comprising the USB communication circuit described in any optional manner of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 This is a schematic diagram of a module structure of a display device provided by an embodiment of the related technology;

[0024] Figure 2 This is a schematic diagram of the module structure of a display device provided in an embodiment of the present application;

[0025] Figure 3 is a schematic diagram of the module structure of another display device provided in an embodiment of the present application;

[0026] Figure 4 This is a schematic diagram of the module structure of another display device provided in an embodiment of the present application;

[0027] Figure 5 This is a schematic diagram of the module structure of another display device provided in an embodiment of the present application;

[0028] Figure 6 This is a schematic diagram of the module structure of another display device provided in an embodiment of the present application.

[0029] Reference numerals:

[0030] 1. USB communication circuit; 11. First communication management module; 111. First hub; 112. First switch; 12. Second communication management module; 121. Second hub; 122. Second switch; 13. Third communication management module; 131. Third hub; 132. Third switch; 14. Control unit; 2. USB interface; 21. First USB interface; 22. Second USB interface; 23. Third USB interface; 24. Fourth USB interface; 3. Host; 31. First host; 32. Second host; 33. Third host; 34. Fourth host; SEL, switch signal; SEL0, close signal; SEL1, open signal. DETAILED DESCRIPTION

[0031] In the following description, specific details such as specific system structures and technologies are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, and circuits are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0032] As display device performance improves, more USB interfaces are now integrated into display devices. For example, there are standard external USB 3.0-A, USB 3.0-C, USB 3.0-B, and USB 2.0 interfaces. Internally, there are also many USB 2.0 and USB 3.0 interfaces, such as USB 2.0 microphone interfaces, USB 2.0 touch interfaces, and USB 3.0 Wi-Fi interfaces. The external interfaces here refer to interfaces for connecting to external USB devices. It can be understood that other USB devices independent of the display device can be plugged into and unplugged from the display device through these interfaces. The internal interfaces refer to interfaces for connecting to USB devices built into the display device. It can be understood that some USB devices built into the display device can be connected to the display device's USB host through these interfaces. Currently, common display devices (such as smart interactive tablets) are usually equipped with multiple hosts, such as a host running Android, a PC running Windows, and a USB TYPE B channel. If the connected host switches from the current host to the target host, it means that the display channel has switched. In this case, the USB device (USB interface) needs to be connected to the corresponding host according to the switching of the display channel. That is, the USB device connected to the aforementioned USB interface needs to be switched to the host running the Android system, the PC running the Windows system, and the onboard USB3.0 channel. Among them, the onboard USB3.0 port can be connected to a laptop computer through a cable. When the user performs a touch operation on the built-in touch screen of the commercial display tablet, the touch operation can be transmitted back to the laptop computer for corresponding display. At the same time, when the laptop computer serves as the host, it can be used to call the USB slave device connected to the commercial display tablet during a meeting in a conference room.

[0033] The display device can connect multiple USB devices (external USB devices and internal USB devices) through the above-mentioned multiple USB interfaces to meet the different needs of users, such as keyboards, printers, scanners, storage devices, cameras, handles, microphones, etc. At the same time, multiple hosts are also provided on the display device, and there are multiple corresponding paths between the host and the USB interface. Currently common display devices (for example, smart interactive tablets) are usually equipped with multiple hosts such as a host running an Android system, a PC host running a Windows system, and a USB TYPE B channel. If the connected host is switched from the current host to the target host, it means that the display channel has been switched. At this time, the USB device needs to switch according to the switching of the display channel. Complex USBHUB and USB SW support are required to switch the USB interface to the corresponding host through the USB HUB and USB SW, so that the USB device connected to the USB interface can switch to the corresponding target host.

[0034] In the related art, the same number of USB HUBs and USB SWs as the number of USB devices is usually used to connect multiple USB devices to the corresponding host according to the switching of display channels. That is, when the display channel is switched, the corresponding USB device will also switch to the currently active host under the control of the USB HUB and USB SW. For example, if the USB interface is a USB2.0 interface and there are four USB interfaces, such as Figure 1 As shown, the USB interface 2 may include a first USB interface 21, a second USB interface 22, a third USB interface 23, and a fourth USB interface 24. The host 3 may include a first host 31, a second host 32, a third host 33, and a fourth host 34. In the related art, there are four corresponding USB HUBs, namely USB HUB1, USB HUB2, USB HUB3, and USB HUB4. There are four corresponding USB SWs, namely USB SW1, USB SW2, USB SW3, and USB SW4. The first input end of USB HUB1 is connected to the first USB interface 21, the second input end of USB HUB1 is connected to the second USB interface 22, the output end of USB HUB1 is connected to the input end of USB SW1, the first output end of USB SW1 is connected to the first input end of USB HUB3, the output end of USB HUB3 is connected to USB SW2, the first output end of USB SW2 is connected to the first host 31, and the second output end of USB SW2 is connected to the second host 32.

[0035] In this example, the first host 31, the second host 32, the third host 33, and the fourth host 34 can correspond to the Android system, the Windows system, and other different systems, respectively, or can be different hosts running two identical systems. Assume that initially, the display device operates on the Android system (the first host 31), that is, the display device is connected to the first host 31 at this time, and the first USB interface 21, the second USB interface 22, the third USB interface 23, and the fourth USB interface are switched to communicate with the first host 31 through the USB HUB and the USB SW, so that the USB devices connected to these USB interfaces 2 can operate normally on the Android system. At this time, if the connected host switches from the current host to the target host, that is, if the connected host switches from the Android system (the first host 31) to the Windows system (the second host 32), the channels corresponding to the first USB interface 21, the second USB interface 22, the third USB interface 23, and the fourth USB interface are switched to the host 2 through USB SW1, USB SW2, USB SW3, and USB SW4, following the display channel, so that the USB devices connected to these USB interfaces 2 can operate normally on the Windows system. However, in the related art, each USB interface 2 corresponds to a USB HUB and a USB SW to achieve switching of the corresponding channel, and multiple USB HUBs, multiple USB SWs and the fourth host 34 need to be connected, resulting in complicated wiring on the board, an increase in components such as USB HUBs and USB SWs, and a higher production cost.

[0036] To this end, the present application provides a USB communication circuit and a display device, which can switch the channels of multiple USB interfaces to the corresponding host based on the display channel to ensure the display and usage reliability of the display device, and there is no need to set a corresponding USB HUB and USB SW for each USB interface, thereby reducing the design cost of the device. At the same time, the switching of multiple USB interface channels can be achieved through a second communication management module, thereby reducing the layout of wiring and saving a certain amount of production cost.

[0037] The USB communication circuit and display device provided in this application are exemplarily introduced below with reference to the accompanying drawings.

[0038] The present application provides a display device, which includes a USB communication circuit. The input end of the USB communication circuit is connected to multiple USB devices through a USB interface 2, and the output end of the USB communication circuit is connected to multiple hosts. The USB communication circuit can switch the channels of multiple USB interfaces 2 (i.e., the channels between the USB interface 2 and the host 3) to the corresponding host 3 following the display channel.

[0039] like Figure 3As shown, the first input end of the USB communication circuit 1 provided in the present application is connected to the first USB interface 21, the second input end of the USB communication circuit 1 is connected to the second USB interface 22, the third input end of the USB communication circuit 1 is connected to the third USB interface 23, and the fourth input end of the USB communication circuit 1 is connected to the fourth USB interface 24, wherein the first USB interface 21, the second USB interface 22, the third USB interface 23 and the fourth USB interface 24 are respectively used for external USB devices. The first output end of the USB communication circuit 1 is connected to the first host 31, the second output end of the USB communication circuit 1 is connected to the second host 32, the third output end of the USB communication circuit 1 is connected to the third host 33, and the fourth output end of the USB communication circuit 1 is connected to the fourth host 34. The USB communication circuit 1 can switch the channels of the first USB interface 21, the second USB interface 22, the third USB interface 23 and the fourth USB interface 24 to the corresponding host 3 following the display channel to ensure the display and use reliability of the display device.

[0040] It is worth noting here that the first host 31, the second host 32, the third host 33 and the fourth host 34 in this application refer to hosts of different systems, such as Android system, Windows system and other systems, or different hosts running two identical systems, and the above-mentioned display channels correspond to different displays implemented based on different hosts.

[0041] In order to enable the USB communication circuit 1 provided by the present application to switch the channels of the first USB interface 21, the second USB interface 22, the third USB interface 23 and the fourth USB interface 24 to the corresponding host following the display channel, in one example, as shown in FIG. Figure 3 As shown, the USB communication circuit 1 may include a first communication management module 11, a second communication management module 12 and a third communication management module 13. The first input end of the first communication management module 11 is connected to the first USB interface 21, the second input end of the first communication management module 11 is connected to the second USB interface 22, the output end of the first communication management module 11 is connected to the first input end of the second communication management module 12, the first output end of the second communication management module 12 is connected to the first host 31, the second output end of the second communication management module 12 is connected to the second host 32, the third output end of the second communication management module 12 is connected to the third host 33, the first input end of the third communication management module 13 is connected to the third USB interface 23, the second input end of the third communication management module 13 is connected to the fourth USB interface 24, the first output end of the third communication management module 13 is connected to the second input end of the second communication management module 12, and the second output end of the third communication management module 13 is connected to the fourth host 34.

[0042] In this example, the USB communication circuit 1 can transmit the signals of the first USB interface 21, the second USB interface 22, the third USB interface 23, and the fourth USB interface 24 to the first host 31, the second host 32, the third host 33, and the fourth host 34, respectively. At the same time, the first input end of the second communication management module 12 is connected to the channels corresponding to the first USB interface 21 and the second USB interface 22, the second input end of the second communication management module 12 is connected to the channels corresponding to the third USB interface 23 and the fourth USB interface 22, and the multiple output ends of the second communication management module 12 are connected to multiple hosts respectively. At this time, if the connected host switches from the current host to the target host (for example, the third host 33), the second communication management module 12 can be controlled to switch the channel to the third host 33, so that the channels of the first USB interface 21, the second USB interface 22, the third USB interface 23, and the fourth USB interface 24 follow the display channel switch and are connected to the corresponding third host 33. In this way, the channels of the four USB interfaces 2 can be switched through three communication management modules, and there is no need to set up an independent communication management module for each USB interface 2, which reduces the design cost of the device and thus saves a certain amount of production cost. At the same time, by controlling the second communication management module 12, the channels of the first USB interface 21, the second USB interface 22, the third USB interface 23 and the fourth USB interface 24 can be switched. There is no need for multiple communication management modules to be connected to the third host 33 respectively, which reduces the layout of the wiring and avoids the need to connect multiple communication management modules and the host, resulting in complex wiring on the board and high production cost.

[0043] It is worth noting here that when the input end of the USB communication circuit 1 is connected to more USB interfaces 2 (for example, seven or eight), multiple USB interfaces 2 can also be connected to the second communication management module 12 to achieve channel switching of multiple USB interfaces 2 by controlling the second communication management module 12. This application does not make any specific restrictions on this.

[0044] In one example, if Figure 4As shown, the first communication management module 11 may include a first hub 111 and a first switch 112. The first input end of the first hub 111 is connected to the first USB interface 21, the second input end of the first hub 111 is connected to the second USB interface 22, the input end of the first switch 112 is connected to the output end of the first hub 111, and the output end of the first switch 112 is connected to the first input end of the second communication management module 12. The first hub 111 can regenerate (i.e., restore signal quality) and amplify the signals of the first USB interface 21 and the second USB interface 22 so that the signals can be transmitted over a longer distance, ensuring that the data can be transmitted to the first switch 112 without loss. The first switch 112 can intelligently forward the signal to the second communication management module 12 according to the destination address of the amplified signal to ensure the reliability and security of signal transmission.

[0045] In one example, if Figure 4 As shown, the second communication management module 12 may include a second hub 121 and a second switch 122, the first input end of the second hub 121 is connected to the output end of the first switch 112, the second input end of the second hub 121 is connected to the first output end of the third communication management module 13, the output end of the second hub 121 is connected to the third host 33, the first input end of the second switch 122 is connected to the output end of the second hub 121, the first output end of the second switch 122 is connected to the first host 31, and the second output end of the second switch 122 is connected to the second host 32. In this example, the signals corresponding to the first USB interface 21, the second USB interface 22, the third USB interface 23, and the fourth USB interface 24 are all aggregated in the second hub 121, so that the second hub 121 regenerates and amplifies these signals, and then transmits these signals to the second switch 122 through the output end. The second switch 122 then intelligently forwards the amplified signals to the first host 31 or the second host 32 based on the destination address of the amplified signals, thereby ensuring the reliability and security of signal transmission. At the same time, the second hub 121 can switch the channels of these USB interfaces 2 to the third host 33, eliminating the need for an additional hub and saving a certain amount of manufacturing cost.

[0046] In order to avoid the problem of mutual interference between the second hub 121 and the second switch 122, in one example, as shown in FIG. Figure 5As shown, the second communication management module 12 can also include a control unit 14, which is connected to the second input end of the second switch 122. The control unit 14 is used to send a control signal to the second switch 122 to control the second switch 122 to selectively conduct (i.e., switch and select the channel corresponding to the second switch 122). Specifically, when the second hub 121 is required to switch the channels of the USB interfaces 2 corresponding to different external USB devices to the third host 33, the control unit 14 sends a first control signal to the second switch 122 to close the second switch 122, so that the channels output by the second hub 121 are connected to the third host 33. At this time, the channels corresponding to the USB devices, the USB interfaces 2 and the second hub 121 have been switched to the third host 33 and will not be transmitted to the first host 31 or the second host 32; when the second hub 121 is required to send signals to the first host 31 or the second host 32 accordingly, the control unit 14 sends a second control signal to the second switch 122, so that the channels output by the second hub 121 are connected to the second switch 122 and the first host 31 (or to the second switch 122 and the second host 32), that is, the second hub 121 will transmit the signal to the second switch 122, so that the second switch 122 will transmit the signal to the first host 31 or the second host 32 accordingly. By providing the control unit 14 , the output channel of the second switch 122 can be switched to improve the reliability of signal transmission.

[0047] Optionally, the control unit 14 can be an additional control chip, or it can reuse the microcontroller unit (MCU) inside the display device, or a chip inside the display device, or the controller or control chip of other peripherals in the display device. When the control unit 14 reuses the MCU or chip inside the display device, the control unit 14 can also send corresponding control signals to the first switch 112 and the third switch 132 to switch the corresponding channels of the first switch 112 and the third switch 132, so as to switch the channel of the USB communication circuit 1 to the corresponding host based on different display channels. This application does not impose any specific restrictions on this.

[0048] In another example, the second communication management module 12 may further include a switch unit 124, wherein a first end of the switch unit 124 is connected to an output end of the second hub 121, a second end of the switch unit 124 is connected to a first input end of the second switch 122, and a controlled end of the switch unit 124 is configured to receive a switch signal SEL. When the second hub 121 is required to switch the channels of the USB interfaces 2 corresponding to different USB devices to the third host 33, a shutdown signal SEL0 may be sent to the controlled end of the switch unit 124 to disconnect the switch unit 124, thereby disconnecting the connection line between the second hub 121 and the second switch 122, thereby maintaining the channel between the second hub 121 and the third host 33. When the second hub 121 is required to send signals to the first host 31 and the second host 32, an on signal SEL1 can be sent to the controlled end of the switch unit 124 to turn on the switch unit 124, thereby connecting the connection line between the second hub 121 and the second switch 122, so that the second switch 122 can transmit the signals to the first host 31 and the second host 32. In this way, the switch signal SEL can be used to control the on and off of the switch unit 124 to correspondingly control the on and off of the connection line between the second hub 121 and the second switch 122, thereby improving the reliability of signal transmission.

[0049] Optionally, the switching unit can be a metal oxide semiconductor (MOS) field effect transistor, such as an NMOS field effect transistor or a PMOS field effect transistor, or any one of an electromagnetic relay or a triode, or other devices or circuits that can achieve the above functions. This application does not impose any specific restrictions on this.

[0050] In one example, if Figures 4 to 6 As shown, the third communication management module 13 may include a third hub 131 and a third switch 132. The first input end of the third hub 131 is connected to the third USB interface 23, the second input end of the third hub 131 is connected to the fourth USB interface 24, the input end of the third switch 132 is connected to the output end of the third hub 131, the first output end of the third switch 132 is connected to the second input end of the second hub 121, and the second output end of the third switch 132 is connected to the fourth host 34. The third hub 131 can regenerate and amplify the signals of the third USB interface 23 and the fourth USB interface 24 so that the signals can be transmitted over a longer distance, ensuring that the data can be transmitted to the third switch 132 without loss. The third switch 132 can intelligently forward the signal to the second hub 121 or the fourth host 34 based on the destination address of the amplified signal to ensure the reliability and security of signal transmission.

[0051] Optionally, the first hub 111, the second hub 121, and the third hub 131 are all USB hubs USBHUB. The installation and configuration of the USB HUB is relatively simple and the cost is low. It is worth noting that the USB interface 2 can be a USB2.0 interface or a USB3.0 interface. When the USB interface 2 of the display device is configured as a USB2.0 interface, the signal transmitted by the USB communication circuit 1 is a USB2.0 electrical signal. At this time, the first hub 111, the second hub 121, and the third hub 131 all use a USB2.0 HUB. In order to increase the transmission speed, the display device provided in this application can also be configured as a USB3.0 interface. In this case, the signal transmitted by the USB communication circuit 1 is a USB 3.0 electrical signal. It is worth noting that when the USB devices connected to the display device include a mouse that can only connect to a USB 2.0 interface, the USB interface 2 of the display device needs to be configured as a USB 2.0 interface. When all the USB devices connected to the display device can connect to a USB 3.0 interface, the USB interface 2 of the display device can be configured as a USB 3.0 interface. In this case, the first hub 111, the second hub 121, and the third hub 131 all use USB 3.0 hubs. When the first hub 111, the second hub 121, and the third hub 131 use USB 3.0 hubs, they can not only receive USB 3.0 electrical signals, but are also backward compatible with USB 2.0 and USB 1.x electrical signals. That is, when all hubs use USB 3.0 hubs, they can receive USB 2.0 electrical signals from the USB 2.0 interface, thereby improving the wide applicability of the display device. This can be set based on actual needs, and this application does not impose specific restrictions.

[0052] Optionally, when the USB interface 2 of the display device is configured as a USB 2.0 interface, the corresponding signal transmitted by the USB communication circuit 1 is a USB 2.0 electrical signal. In this case, the first switch 112, the second switch 122, and the third switch 132 all use USB 2.0 switches, i.e., USB 2.0 SWITCH. When the USB interface 2 of the display device is configured as a USB 3.0 interface, the corresponding signal transmitted by the USB communication circuit 1 is a USB 3.0 electrical signal. In this case, the first switch 112, the second switch 122, and the third switch 132 all use USB 3.0 switches, i.e., USB 3.0 SWITCH. When the first switch 112, the second switch 122, and the third switch 132 all use USB 3.0 switches, they can not only receive USB 3.0 electrical signals, but are also backward compatible with USB 2.0 electrical signals. That is, when the switches all use USB 3.0 SWITCH, they can receive USB 2.0 electrical signals from the USB 2.0 interface. Moreover, the USB SWITCH has strong compatibility and versatility, can support multiple USB standards to improve device compatibility, is applicable to USB devices of different specifications, and can achieve fast switching between channels of multiple USB interfaces 2 with high switching efficiency.

[0053] In summary, the USB communication circuit 1 provided in the present application can transmit the signals of the first USB interface 21, the second USB interface 22, the third USB interface 23 and the fourth USB interface 24 to the first host 31, the second host 32, the third host 33 and the fourth host 34 respectively. At the same time, the first input end of the second communication management module 12 can be connected to the signals corresponding to the first USB interface 21 and the second USB interface 22, and the second input end of the second communication management module 12 can be connected to the signals corresponding to the third USB interface 23 and the fourth USB interface 22. That is, at this time, the signals corresponding to the first USB interface 21, the second USB interface 22, the third USB interface 23 and the fourth USB interface 24 are all gathered in the second communication management module 12. The channels of the four USB interfaces 2 can be switched through three communication management modules. There is no need to set up an independent communication management module for each USB interface 2, which reduces the design cost of the device and thus saves a certain amount of production cost. At the same time, by controlling the second communication management module 12, the channels of the first USB interface 21, the second USB interface 22, the third USB interface 23 and the fourth USB interface 24 can be switched. There is no need for multiple communication management modules to be connected to the third host 33 respectively, which reduces the layout of the wiring and avoids the need to connect multiple communication management modules and the host, which leads to complex wiring on the board and high production cost. It saves a certain amount of production cost and simplifies the production process of the board.

[0054] Based on the above embodiments, the present application also provides a display device, which may include: Figures 2 to 6 The corresponding USB communication circuit 1 described in any embodiment.

[0055] In an embodiment of the present application, the display device can be any existing display or display screen such as a commercial display flat panel, a conference flat panel, an interactive flat panel display (IFPD), etc. The external electronic device (i.e., the multiple external devices described in the above embodiments) can be a user equipment (UE), such as a tablet computer, a laptop computer, a PDA or a desktop computer and other terminal devices. The external electronic device can be connected to a USB port (USB2.0 port or USB3.0 port) and act as a USB host of the display device to call the USB connected to each USB interface of the display device.

[0056] In an embodiment of the present application, when the main device for controlling the display in the display device changes, i.e. switches, the main control or micro control unit of the display device can send a main device switching instruction to the channel switching control device after detecting the change. For example, the voltage of the access pin corresponding to each main device can be detected. When a main device is not connected, the voltage value of the access pin is 0. At this time, the detection signal input to the main control or micro control unit is a low-level signal to indicate that the main device is not connected; when the main device is connected, the access pin is pulled high. At this time, the detection signal input to the main control or micro control unit MCU is a high-level signal to indicate that the main device is connected. The main control or micro control unit MCU can determine the switching status of the main device based on the change of the access detection signal, thereby generating a main device switching instruction.

[0057] Since the display device is provided with the USB communication circuit of the above embodiment, it has all the beneficial effects of the USB communication circuit in any of the above embodiments, which will not be described in detail here.

[0058] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0059] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0060] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0061] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0062] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A USB communication circuit for a display device, wherein the display device is configured with a USB interface, wherein the USB interface includes a first USB interface, a second USB interface, a third USB interface, and a fourth USB interface, wherein: The USB communication circuit comprises: a first communication management module, wherein a first input end of the first communication management module is connected to the first USB interface, and a second input end of the first communication management module is connected to the second USB interface; a second communication management module, wherein a first input terminal of the second communication management module is connected to an output terminal of the first communication management module, a first output terminal of the second communication management module is connected to a first host, a second output terminal of the second communication management module is connected to a second host, and a third output terminal of the second communication management module is connected to a third host; and a third communication management module, wherein a first input end of the third communication management module is connected to the third USB interface, a second input end of the third communication management module is connected to the fourth USB interface, a first output end of the third communication management module is connected to the second input end of the second communication management module, and a second output end of the third communication management module is connected to a fourth host; Wherein, the USB interface is a USB2.0 interface or a USB3.0 interface.

2. The USB communication circuit according to claim 1, wherein: The first communication management module includes: a first hub, wherein a first input end of the first hub is connected to the first USB interface, and a second input end of the first hub is connected to the second USB interface; and A first switch, wherein the input end of the first switch is connected to the output end of the first hub, and the output end of the first switch is connected to the first input end of the second communication management module.

3. The USB communication circuit according to claim 2, wherein: The second communication management module includes: a second hub, wherein a first input terminal of the second hub is connected to an output terminal of the first switch, a second input terminal of the second hub is connected to a first output terminal of the third communication management module, and an output terminal of the second hub is connected to the third host; and A second switch, wherein a first input end of the second switch is connected to an output end of the second hub, a first output end of the second switch is connected to the first host, and a second output end of the second switch is connected to the second host.

4. The USB communication circuit according to claim 3, wherein: The USB communication circuit further includes: A control unit is connected to the second input end of the second switch, and is used to send a control signal to the second switch to control the second switch to be selectively turned on.

5. The USB communication circuit according to claim 3, wherein: The second communication management module further includes: A switch unit, wherein a first end of the switch unit is connected to an output end of the second hub, a second end of the switch unit is connected to a first input end of the second switch, and a controlled end of the switch unit is used to access a switch signal.

6. The USB communication circuit according to claim 5, characterized in that: The switch unit includes any one of a metal oxide semiconductor field effect transistor, an electromagnetic relay or a triode.

7. The USB communication circuit according to any one of claims 3 to 6, characterized in that: The third communication management module includes: a third hub, wherein a first input terminal of the third hub is connected to the third USB interface, and a second input terminal of the third hub is connected to the fourth USB interface; and A third switch, wherein the input end of the third switch is connected to the output end of the third hub, the first output end of the third switch is connected to the second input end of the second hub, and the second output end of the third switch is connected to the fourth host.

8. The USB communication circuit according to claim 7, wherein: The first hub, the second hub, and the third hub are all USB hubs.

9. The USB communication circuit according to claim 8, wherein: The first switch, the second switch, and the third switch are all USB 2.0 switches or USB 3.0 switches.

10. A display device, characterized in that: The USB communication circuit comprises the USB communication circuit as described in any one of claims 1 to 9.

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