Signal switching device, method and kvm switch supporting multi-channel video output

Abstract

The application relates to the technical field of KVM switchers, and discloses a signal switching device, a signal switching method and a KVM switcher supporting multi-path video output. The device comprises a switching control circuit, a video signal switching circuit and a USB signal switching circuit. The video signal switching circuit is used for performing switching processing on the video signal of a target video input device according to a video switching control instruction received from the switching control circuit, and transmitting the processed video signal to a display device to display a corresponding picture. The USB signal switching circuit is used for performing switching processing on the USB signal of the target video input device according to a USB signal switching control instruction received from the switching control circuit, so as to turn on the signal channel between the target video input device and a USB signal device, and perform keyboard and mouse operation and device data transmission operation on the target video input device. The device not only supports multi-path independent video output, improves the switching processing accuracy of the video and the USB signal, but also improves the video output effect.

Description

Technical Field

[0001] This invention relates to the field of KVM switch technology, and in particular to a signal switching device, method and KVM switch that supports multi-channel video output. Background Technology

[0002] In the current field of computer peripherals and video processing technology, KVM (Keyboard, Video, Mouse) switches are widely used as a key device in various scenarios such as homes, offices, and laboratories, greatly facilitating users to control and manage multiple servers or computer hosts with a single keyboard, monitor, and mouse.

[0003] However, with the rapid development of high-definition display technology, traditional KVM switches have encountered severe challenges in multi-channel video output. Currently, the mainstream multi-channel video output technologies on the market mainly include DisplayLink software compression technology and MST (Multi-Stream Transport) technology, but both have significant drawbacks: DisplayLink technology relies on high-compression video encoding, leading to severe image quality degradation, frequent loss of detail, blurred edges, and color banding / noise, making it difficult to meet the high-quality image requirements of professional graphic design, medical imaging, and video editing fields; while MST technology attempts to transmit multiple video streams by packaging them, it introduces significant signal processing latency, causing noticeable stuttering during mouse movement and window dragging, and is limited by the bandwidth of a single DisplayPort interface, making it impossible to transmit multiple 8K signals simultaneously, requiring a reduction in resolution or refresh rate. Furthermore, MST technology also faces poor compatibility issues, with frequent black screen and flickering problems between devices from different brands.

[0004] Therefore, developing a KVM switch that can support multiple independent video outputs while ensuring video output quality has become a key issue that urgently needs to be addressed in the current technological field. Summary of the Invention

[0005] This invention provides a signal switching device, method, and KVM switch that supports multiple video outputs. It not only supports multiple independent video outputs and improves the accuracy of switching and processing video and USB signals, but also improves the video output effect.

[0006] To address the aforementioned technical problems, the first aspect of this invention discloses a signal switching device supporting multi-channel video output. The device includes a switching control circuit, a video signal switching circuit, and a USB signal switching circuit, wherein: The control terminal of the switching control circuit is electrically connected to the controlled terminal of the video signal switching circuit and the controlled terminal of the USB signal switching circuit. The video signal receiving end of the video signal switching circuit is used to electrically connect to the video signal transmitting end of multiple video input devices, and the video signal output end of the video signal switching circuit is used to electrically connect to the video signal receiving end of the display device. The USB signal receiving end of the USB signal switching circuit is used to electrically connect to the USB signal transmitting end of all the video input devices, and the USB signal output end of the USB signal switching circuit is used to electrically connect to the USB signal receiving end of the USB signal device. The switching control circuit is configured to determine, based on the received target switching instruction, a video switching control instruction and a USB signal switching control instruction that match the target switching instruction, and send the video switching control instruction to the video signal switching circuit and the USB signal switching control instruction to the USB signal switching circuit. The video signal switching circuit is used to perform switching processing on the video signals output by the target video input device among all the video input devices according to the video switching control command, to obtain the processed video signal, and to transmit the processed video signal to the display device so that the display device displays the image that matches the target video input device; The USB signal switching circuit is used to perform switching processing on the USB signal output by the target video input device according to the USB signal switching control command, to obtain a processed USB signal, and to conduct the signal path between the target video input device and the USB signal device through the processed USB signal, so as to perform keyboard and mouse operation and device data transmission operation on the target video input device.

[0007] As an optional implementation, in the first aspect of the present invention, the video signal switching circuit includes a differential signal switching module and a coordinated display signal switching module, wherein: The controlled end of the differential signal switching module and the controlled end of the collaborative display signal switching module are both electrically connected to the control end of the switching control circuit. The differential signal receiving end of the differential signal switching module is used to electrically connect to the differential signal transmitting end of all the video input devices. The differential signal output end of the differential signal switching module is used to electrically connect to the differential signal receiving end of the display device. The collaborative display signal receiving end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal transmitting end of all the video input devices. The collaborative display signal output end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal receiving end of the display device. The differential signal switching module is used to perform differential switching processing on the differential signals output by the target video input device among all the video input devices according to the video switching control command, to obtain the processed differential signal, and to transmit the processed differential signal to the display device; the differential switching processing operation includes a first gain operation, a first phase compensation operation, and a first frame interpolation operation; The collaborative display signal switching module is used to perform collaborative display switching processing on the collaborative display signal output by the target video input device according to the video switching control command, to obtain the processed collaborative display signal, and to transmit the processed collaborative display signal to the display device; the collaborative display signal includes a hot-plug detection signal and auxiliary channel positive and negative signals, and the collaborative display switching processing operation includes a second gain operation, a second phase compensation operation, and a second frame interpolation operation.

[0008] As an optional implementation, in the first aspect of the present invention, the USB signal switching circuit includes a USB 3.0 signal switching processing module, a USB 2.0 signal processing switching module, and a virtualization processing module, wherein: The controlled terminals of the USB 3.0 signal switching module, the USB 2.0 signal processing switching module, and the virtualization processing module are all electrically connected to the control terminal of the switching control circuit. The USB 3.0 signal receiving end of the USB 3.0 signal switching processing module is used to electrically connect to the USB 3.0 signal transmitting end of all the video input devices, and the USB 3.0 signal output end of the USB 3.0 signal switching processing module is used to electrically connect to the USB signal receiving end of the USB 3.0 signal device. The USB2.0 signal receiving end of the USB2.0 signal processing and switching module is used to electrically connect to the USB2.0 signal transmitting end of all the video input devices, and the first output end of the USB2.0 signal of the USB2.0 signal processing and switching module is electrically connected to the USB signal conversion end of the USB3.0 signal switching and processing module. The USB signal conversion terminal of the virtualization processing module is electrically connected to the second USB 2.0 signal output terminal of the USB 2.0 signal processing switching module, and the USB 1.1 signal output terminal of the virtualization processing module is used to electrically connect to the USB signal receiving terminal of the keyboard and mouse device. The USB 3.0 signal switching processing module is used to switch the USB 3.0 signal output by the target video input device according to the USB signal switching control command, and to perform shaping and amplification processing on the USB 3.0 signal to obtain a first processed USB 3.0 signal; The USB 2.0 signal processing and switching module is used to shape and amplify the USB 2.0 signals output by all the video input devices to obtain the processed USB 2.0 signals corresponding to all the video input devices, and to switch the processed USB 2.0 signal corresponding to the target video input device according to the USB signal switching control command, so as to transmit the processed USB 2.0 signal corresponding to the target video input device to the USB 3.0 signal switching and processing module; The USB 3.0 signal switching processing module is further configured to perform shaping and amplification processing on the processed USB 2.0 signal corresponding to the target video input device to obtain a second processed USB 3.0 signal, and to conduct the signal path between the target video input device and the USB 3.0 signal device through the first processed USB 3.0 signal and the second processed USB 3.0 signal, so as to perform device data transmission operation on the target video input device; The virtualization processing module is used to convert the processed USB 2.0 signal corresponding to the target video input device into a USB 1.1 signal corresponding to the target video input device according to the USB signal switching control command, and to connect the signal path between the target video input device and the keyboard and mouse device through the USB 1.1 signal so as to perform keyboard and mouse operation on the target video input device.

[0009] As an optional implementation, in the first aspect of the present invention, the USB 3.0 signal switching processing module includes a USB 3.0 signal switching chip and a USB 3.0 signal processing chip, wherein: The controlled terminal of the USB 3.0 signal switching chip is electrically connected to the control terminal of the switching control circuit. The USB 3.0 signal receiving terminal of the USB 3.0 signal switching chip is used to electrically connect to the USB 3.0 signal transmitting terminal of all the video input devices. The USB 3.0 signal output terminal of the USB 3.0 signal switching chip is electrically connected to the USB 3.0 signal receiving terminal of the USB 3.0 signal processing chip. The USB 3.0 signal output terminal of the USB 3.0 signal processing chip is used to electrically connect to the USB signal receiving terminal of the USB 3.0 signal device.

[0010] As an optional implementation, in the first aspect of the present invention, the USB 2.0 signal processing switching module includes a USB 2.0 signal processing chip and a USB 2.0 signal switching chip, wherein: The controlled terminal of the USB 2.0 signal switching chip is electrically connected to the control terminal of the switching control circuit. The USB 2.0 signal receiving terminal of the USB 2.0 signal processing chip is used to electrically connect to the USB 2.0 signal transmitting terminals of all the video input devices. The first USB 2.0 signal output terminal of the USB 2.0 signal processing chip is electrically connected to the USB 2.0 signal receiving terminal of the USB 2.0 signal switching chip. The USB 2.0 signal output terminal of the USB 2.0 signal switching chip is electrically connected to the USB signal conversion terminal of the USB 3.0 signal processing chip.

[0011] As an optional implementation, in a first aspect of the present invention, the virtualization processing module includes a virtualization processing chip, wherein: The controlled terminals of the virtualization processing chip are all electrically connected to the control terminals of the switching control circuit. The USB signal conversion terminal of the virtualization processing chip is electrically connected to the second USB 2.0 signal output terminal of the USB 2.0 signal processing chip. The USB 1.1 signal output terminal of the virtualization processing chip is used to electrically connect to the USB signal receiving terminal of the keyboard and mouse device.

[0012] A second aspect of this invention discloses a signal switching method supporting multi-channel video output. The method is applied in a signal switching device supporting multi-channel video output. The device includes a switching control circuit, a video signal switching circuit, and a USB signal switching circuit, wherein: The control terminal of the switching control circuit is electrically connected to the controlled terminal of the video signal switching circuit and the controlled terminal of the USB signal switching circuit. The video signal receiving end of the video signal switching circuit is used to electrically connect to the video signal transmitting end of multiple video input devices, and the video signal output end of the video signal switching circuit is used to electrically connect to the video signal receiving end of the display device. The USB signal receiving end of the USB signal switching circuit is used to electrically connect to the USB signal transmitting end of all the video input devices, and the USB signal output end of the USB signal switching circuit is used to electrically connect to the USB signal receiving end of the USB signal device. The method includes: The switching control circuit determines a video switching control command and a USB signal switching control command that match the received target switching command, and sends the video switching control command to the video signal switching circuit and the USB signal switching control command to the USB signal switching circuit. The video signal switching circuit performs switching processing on the video signals output by the target video input device among all the video input devices according to the video switching control command, obtains the processed video signal, and transmits the processed video signal to the display device so that the display device displays the image that matches the target video input device; The USB signal switching circuit performs switching processing on the USB signal output by the target video input device according to the USB signal switching control command, obtains a processed USB signal, and conducts the signal path between the target video input device and the USB signal device through the processed USB signal, so as to perform keyboard and mouse operation and device data transmission operation on the target video input device.

[0013] As an optional implementation, in a second aspect of the present invention, the video signal switching circuit includes a differential signal switching module and a coordinated display signal switching module, wherein: The controlled end of the differential signal switching module and the controlled end of the collaborative display signal switching module are both electrically connected to the control end of the switching control circuit. The differential signal receiving end of the differential signal switching module is used to electrically connect to the differential signal transmitting end of all the video input devices. The differential signal output end of the differential signal switching module is used to electrically connect to the differential signal receiving end of the display device. The collaborative display signal receiving end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal transmitting end of all the video input devices. The collaborative display signal output end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal receiving end of the display device. The video signal switching circuit, according to the video switching control command, performs switching processing on the video signals output by the target video input device among all the video input devices to obtain a processed video signal, and transmits the processed video signal to the display device, including: The differential signal switching module performs differential switching processing on the differential signals output by the target video input devices in all the video input devices according to the video switching control command, obtains the processed differential signal, and transmits the processed differential signal to the display device; the differential switching processing operation includes a first gain operation, a first phase compensation operation, and a first frame interpolation operation; The collaborative display signal switching module performs collaborative display switching processing on the collaborative display signal output by the target video input device according to the video switching control command, obtains the processed collaborative display signal, and transmits the processed collaborative display signal to the display device; the collaborative display signal includes a hot-plug detection signal and auxiliary channel positive and negative signals, and the collaborative display switching processing operation includes a second gain operation, a second phase compensation operation, and a second frame interpolation operation.

[0014] As an optional implementation, in a second aspect of the present invention, the USB signal switching circuit includes a USB 3.0 signal switching processing module, a USB 2.0 signal processing switching module, and a virtualization processing module, wherein: The controlled terminals of the USB 3.0 signal switching module, the USB 2.0 signal processing switching module, and the virtualization processing module are all electrically connected to the control terminal of the switching control circuit. The USB 3.0 signal receiving end of the USB 3.0 signal switching processing module is used to electrically connect to the USB 3.0 signal transmitting end of all the video input devices, and the USB 3.0 signal output end of the USB 3.0 signal switching processing module is used to electrically connect to the USB signal receiving end of the USB 3.0 signal device. The USB2.0 signal receiving end of the USB2.0 signal processing and switching module is used to electrically connect to the USB2.0 signal transmitting end of all the video input devices, and the first output end of the USB2.0 signal of the USB2.0 signal processing and switching module is electrically connected to the USB signal conversion end of the USB3.0 signal switching and processing module. The USB signal conversion terminal of the virtualization processing module is electrically connected to the second USB 2.0 signal output terminal of the USB 2.0 signal processing switching module, and the USB 1.1 signal output terminal of the virtualization processing module is used to electrically connect to the USB signal receiving terminal of the keyboard and mouse device. The USB signal switching circuit, according to the USB signal switching control command, performs switching processing on the USB signal output by the target video input device to obtain a processed USB signal. Through the processed USB signal, it establishes a signal path between the target video input device and the USB signal device to enable keyboard and mouse operations and data transmission operations on the target video input device, including: The USB 3.0 signal switching processing module switches the USB 3.0 signal output by the target video input device according to the USB signal switching control command, and performs shaping and amplification processing on the USB 3.0 signal to obtain the first processed USB 3.0 signal; The USB 2.0 signal processing and switching module shapes and amplifies the USB 2.0 signals output by all the video input devices to obtain the processed USB 2.0 signals corresponding to all the video input devices. According to the USB signal switching control command, it switches the processed USB 2.0 signal corresponding to the target video input device to transmit the processed USB 2.0 signal corresponding to the target video input device to the USB 3.0 signal switching and processing module. The USB 3.0 signal switching processing module shapes and amplifies the processed USB 2.0 signal corresponding to the target video input device to obtain a second processed USB 3.0 signal. Through the first processed USB 3.0 signal and the second processed USB 3.0 signal, the signal path between the target video input device and the USB 3.0 signal device is established to perform device data transmission operation on the target video input device. The virtualization processing module performs signal conversion on the processed USB 2.0 signal corresponding to the target video input device according to the USB signal switching control command, to obtain the USB 1.1 signal corresponding to the target video input device, and conducts the signal path between the target video input device and the keyboard and mouse device through the USB 1.1 signal, so as to perform keyboard and mouse operation on the target video input device.

[0015] The third aspect of the present invention discloses a KVM switcher, the KVM switcher including a housing and a circuit board, the circuit board including a signal switching device supporting multi-channel video output as described in any one of the first aspects of the present invention.

[0016] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: In this embodiment of the invention, not only is multi-channel independent video output supported, improving the accuracy of switching between video and USB signals, but the video output effect is also improved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a signal switching device supporting multi-channel video output disclosed in an embodiment of the present invention; Figure 2 This is a framework diagram of a signal switching device supporting multi-channel video output disclosed in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a differential signal switching module disclosed in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a collaborative display signal switching module disclosed in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a USB 3.0 signal switching chip disclosed in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a USB 3.0 signal processing chip disclosed in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a USB 2.0 signal processing chip disclosed in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a USB 2.0 signal switching chip disclosed in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a virtualization processing chip disclosed in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of an MCU control module disclosed in an embodiment of the present invention; Figure 11 This is a flowchart illustrating a signal switching method supporting multi-channel video output disclosed in an embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of a KVM switch disclosed in an embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that, unless otherwise explicitly specified and limited, the term "electrical connection" in the specification, claims and accompanying drawings of this invention should be interpreted broadly. For example, it can be a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; it can be a mechanical electrical connection, an electrical connection, or a connection that allows communication between the two; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements or an interaction between two elements.

[0021] Furthermore, the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Additionally, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] This invention discloses a signal switching device, method, and KVM switch that supports multiple video outputs. It not only supports multiple independent video outputs and improves the accuracy of switching and processing video and USB signals, but also improves the video output effect.

[0024] Example 1 Please see Figure 1 , Figure 1 This is a schematic diagram of a signal switching device supporting multi-channel video output disclosed in an embodiment of the present invention. This device can be applied in scenarios requiring the control and management of multiple servers or computer hosts, such as office scenarios, financial transaction scenarios, monitoring and command scenarios, industrial control scenarios, etc. Figure 1 As shown, the signal switching device supporting multi-channel video output includes a switching control circuit 101, a video signal switching circuit 102, and a USB signal switching circuit 103, wherein: The control terminal of the switching control circuit 101 is electrically connected to the controlled terminal of the video signal switching circuit 102 and the controlled terminal of the USB signal switching circuit 103; The video signal receiving end of the video signal switching circuit 102 is used to electrically connect to the video signal transmitting end of multiple video input devices 104, and the video signal output end of the video signal switching circuit 102 is used to electrically connect to the video signal receiving end of the display device 105. The USB signal receiving end of the USB signal switching circuit 103 is used to electrically connect to the USB signal transmitting end of all video input devices 104, and the USB signal output end of the USB signal switching circuit 103 is used to electrically connect to the USB signal receiving end of the USB signal device 106. The switching control circuit 101 is used to determine the video switching control command and the USB signal switching control command that match the target switching command according to the received target switching command, and send the video switching control command to the video signal switching circuit 102 and the USB signal switching control command to the USB signal switching circuit 103. The video signal switching circuit 102 is used to perform switching processing on the video signals output by the target video input device 104 among all video input devices 104 according to the video switching control command, to obtain the processed video signal, and to transmit the processed video signal to the display device 105 so that the display device 105 displays the image that matches the target video input device 104; The USB signal switching circuit 103 is used to perform switching processing on the USB signal output by the target video input device 104 according to the USB signal switching control command, to obtain the processed USB signal, and to conduct the signal path between the target video input device 104 and the USB signal device 106 through the processed USB signal, so as to perform keyboard and mouse operation and device data transmission operation on the target video input device 104.

[0025] In this embodiment of the invention, the video input device 104 may optionally be a smart computer, a smart tablet, or a server, etc.

[0026] Furthermore, the video signal transmitting end of all video input devices 104 can be electrically connected to the video signal receiving end of the video signal switching circuit 102 through HDMI (High Definition Multimedia Interface) video input modules and DP (DisplayPort) video input modules.

[0027] The HDMI video input module may include an ESD protection circuit (input electrostatic protection circuit), a DDC processing circuit, and an HPD input level conversion circuit. The ESD protection circuit may consist of junction capacitors and ESD protection devices (such as TVS diodes and ESD suppressors) to improve the product's immunity to electromagnetic interference from electrostatic discharge. The DDC (Digital DownConverter) processing circuit may consist of pull-up resistors that ensure signal level stability, provide drive capability, provide anti-static protection, and prevent floating, as well as series resistors that provide impedance matching and signal protection. The HPD input level conversion circuit may consist of NPN transistors, PNP transistors, and resistors to achieve level conversion and improve the product's compatibility with various signal sources.

[0028] Furthermore, the DP video input module may include an ESD protection circuit and an AUX (Auxiliary) input detection circuit. The ESD protection circuit can consist of junction capacitance and ESD protection devices (such as TVS diodes and ESD suppressors) to improve the product's immunity to electromagnetic field effects from electrostatic discharge. The AUX input detection circuit can consist of an NMOS transistor, a discharge resistor, and a TVS transistor. The NMOS transistor is used for level conversion and signal detection; the discharge resistor ensures stable shutdown and prevents false triggering; and the TVS transistor is rapidly broken down when a momentary high-voltage pulse appears at the input, clamping the voltage to a safe value and diverting most of the inrush current to ground, thereby protecting the gate oxide layer of the subsequent NMOS transistor from breakdown and ensuring long-term reliable circuit operation.

[0029] Furthermore, the video signal receiving end of the display device 105 can be electrically connected to the video signal output end of the video signal switching circuit 102 through an HDMI video output module and a DP signal output processing module.

[0030] The HDMI video output module may include an ESD protection circuit, a DDC processing circuit, an overcurrent control protection circuit, and a TMDS (differential) signal AC coupling circuit. The overcurrent control protection circuit, which can consist of a current-limiting chip and resistors / capacitors, primarily functions as a switch to prevent backflow, limit current, and provide short-circuit protection, preventing voltage from the HDMI output from flowing back into the system power supply (the circuit structure and function of the ESD protection circuit and DDC processing circuit can be found in the aforementioned sections).

[0031] Furthermore, the USB signal receiving end of the USB signal switching circuit 103 can be electrically connected to the USB signal transmitting end of all video input devices 104 through the USB signal input processing module.

[0032] The USB signal input processing module may include a surge protection circuit, a power reverse current protection circuit, a common-mode rejection circuit, and an ESD protection circuit. The surge protection circuit may use a TVS diode; the power reverse current protection circuit may use a Schottky diode to prevent voltage from other video input devices 104 from flowing back into the current video input device 104; and the ESD protection circuit may use a junction capacitor.

[0033] As can be seen, the embodiments of the present invention can switch the video signal of the target video input device through a video signal switching circuit and according to the video switching control command received from the switching control circuit, and transmit the processed video signal to the display device to display the corresponding image; and, through a USB signal switching circuit and according to the USB signal switching control command received from the switching control circuit, switch the USB signal of the target video input device to connect the signal path between the target video input device and the USB signal device, and perform keyboard and mouse operation and device data transmission operation on the target video input device. It not only supports multiple independent video outputs, realizes three native HDMI 2.1 and DP1.4 independent outputs of KVM, breaks through the single-channel bandwidth limitation, improves the accuracy of switching processing of video and USB signals, but also improves the video output effect and eliminates screen tearing and delay in multi-screen displays.

[0034] In an optional embodiment, such as Figure 2 As shown, the video signal switching circuit 102 includes a differential signal switching module and a coordinated display signal switching module, wherein: The controlled end of the differential signal switching module and the controlled end of the collaborative display signal switching module are both electrically connected to the control end of the switching control circuit 101. The differential signal receiving end of the differential signal switching module is used to electrically connect to the differential signal transmitting end of all video input devices 104. The differential signal output end of the differential signal switching module is used to electrically connect to the differential signal receiving end of the display device 105. The collaborative display signal receiving end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal transmitting end of all video input devices 104. The collaborative display signal output end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal receiving end of the display device 105. The differential signal switching module is used to perform differential switching processing on the differential signals output by the target video input device 104 in all video input devices 104 according to the video switching control command, to obtain the processed differential signal, and to transmit the processed differential signal to the display device 105. The collaborative display signal switching module is used to perform collaborative display switching processing on the collaborative display signal output by the target video input device 104 according to the video switching control command, to obtain the processed collaborative display signal, and to transmit the processed collaborative display signal to the display device 105.

[0035] In this optional embodiment, the differential switching processing operation further includes a first gain operation, a first phase compensation operation, and a first frame interpolation operation; the cooperative display signal includes a hot-plug detection signal (HPD signal) and auxiliary channel positive and negative signals (AUXP / N signals), and the cooperative display switching processing operation includes a second gain operation, a second phase compensation operation, and a second frame interpolation operation. The differential signal is the TMDS signal.

[0036] Furthermore, such as Figure 3 As shown, the differential signal switching module includes a chip with equalizer gain control (such as the PI3HDX12221 chip), which can adaptively adjust the gain and offers high performance (single-channel rate up to 12Gbps, total bandwidth 48Gbps, supporting 8K ultra-high-definition video transmission) and low power consumption. The PI3HDX12221 chip is used to switch and process 8K signals from two HDMI inputs, performing gain control, dynamic phase compensation, and intelligent frame interpolation to generate transition frames, preventing image jumps. The processed 8K video signal is then output to the HDMI video output module.

[0037] Furthermore, such as Figure 4 As shown, this collaborative display signal switching module includes a chip with equalizer gain control (such as the PS8461E chip), which can also achieve adaptive gain adjustment and offers high performance (single-channel rate up to 8.1Gbps, total bandwidth 32.4Gbps, supporting 8K ultra-high-definition video transmission) and low power consumption. The PS8461E is used to switch and process 8K signals from two DP inputs, using these signals for gain control, dynamic phase compensation, and intelligent frame interpolation detection to generate transition frames, preventing image jumps. The processed 8K video signal is then output to the DP video output module.

[0038] As can be seen, this optional embodiment can achieve adaptive gain adjustment, dynamic phase compensation and intelligent frame interpolation of various video signals by integrating a differential signal switching module and a collaborative display signal switching module, so as to ensure the smooth and stable transmission of ultra-high-definition video signals to the display device, thereby improving the compatibility and stability of the overall system's multi-channel video switching control.

[0039] In another alternative embodiment, such as Figure 2 As shown, the USB signal switching circuit 103 includes a USB 3.0 signal switching processing module, a USB 2.0 signal processing and switching module, and a virtualization processing module, wherein: The controlled terminals of the USB3.0 signal switching module, the USB2.0 signal processing switching module, and the virtualization processing module are all electrically connected to the control terminal of the switching control circuit 101. The USB 3.0 signal receiving end of the USB 3.0 signal switching processing module is used to electrically connect to the USB 3.0 signal transmitting end of all video input devices 104, and the USB 3.0 signal output end of the USB 3.0 signal switching processing module is used to electrically connect to the USB signal receiving end of USB 3.0 signal devices. The USB2.0 signal receiving end of the USB2.0 signal processing and switching module is used to electrically connect to the USB2.0 signal transmitting end of all video input devices 104, and the first output end of the USB2.0 signal of the USB2.0 signal processing and switching module is electrically connected to the USB signal conversion end of the USB3.0 signal switching and processing module. The USB signal conversion terminal of the virtualization processing module is electrically connected to the second USB 2.0 signal output terminal of the USB 2.0 signal processing switching module, and the USB 1.1 signal output terminal of the virtualization processing module is used to electrically connect to the USB signal receiving terminal of the keyboard and mouse device. The USB 3.0 signal switching processing module is used to switch the USB 3.0 signal output by the target video input device 104 according to the USB signal switching control command, and to perform shaping and amplification processing on the USB 3.0 signal to obtain the first processed USB 3.0 signal. The USB 2.0 signal processing and switching module is used to shape and amplify the USB 2.0 signals output by all video input devices 104 to obtain the processed USB 2.0 signals corresponding to all video input devices 104, and to switch the processed USB 2.0 signals corresponding to the target video input device 104 according to the USB signal switching control command, so as to transmit the processed USB 2.0 signals corresponding to the target video input device 104 to the USB 3.0 signal switching processing module; The USB 3.0 signal switching and processing module is also used to shape and amplify the processed USB 2.0 signal corresponding to the target video input device 104 to obtain a second processed USB 3.0 signal, and to conduct the signal path between the target video input device 104 and the USB 3.0 signal device through the first processed USB 3.0 signal and the second processed USB 3.0 signal, so as to perform device data transmission operation on the target video input device 104; The virtualization processing module is used to convert the processed USB 2.0 signal corresponding to the target video input device 104 into a USB 1.1 signal corresponding to the target video input device 104 according to the USB signal switching control command, and to conduct the signal path between the target video input device 104 and the keyboard and mouse device through the USB 1.1 signal, so as to perform keyboard and mouse operations on the target video input device 104.

[0040] In this optional embodiment, the USB 3.0 signal device may optionally include a USB flash drive, a camera, or other similar devices. The USB 3.0 signal output terminal of the USB 3.0 signal switching processing module can be electrically connected to the USB signal receiving terminal of the USB 3.0 signal device via the USB 3.0 signal output processing module, which may include an ESD protection circuit, a current limiting protection circuit, a common-mode rejection circuit, and a USB connector.

[0041] Furthermore, the USB 3.0 signal switching and processing module includes a USB 3.0 signal switching chip and a USB 3.0 signal processing chip, wherein: The controlled end of the USB 3.0 signal switching chip is electrically connected to the control end of the switching control circuit 101. The USB 3.0 signal receiving end of the USB 3.0 signal switching chip is used to electrically connect to the USB 3.0 signal transmitting end of all video input devices 104. The USB 3.0 signal output end of the USB 3.0 signal switching chip is electrically connected to the USB 3.0 signal receiving end of the USB 3.0 signal processing chip. The USB 3.0 signal output end of the USB 3.0 signal processing chip is used to electrically connect to the USB signal receiving end of the USB 3.0 signal device.

[0042] Among them, such as Figure 5 As shown, the USB 3.0 signal switching chip is likely the AW3410, primarily used for 2-to-1 switching of two input signals. There is no significant difference between the input and output signals because it boasts a typical bandwidth of up to 10GHz, far exceeding the requirements of USB 3.0 (5Gbps) and even meeting the needs of USB 3.1 (10Gbps). This high bandwidth means that high-frequency components can pass through the switch almost without loss, theoretically making the signal before and after the switch virtually indistinguishable; for example... Figure 6 As shown, the USB 3.0 signal processing chip is likely the GL3510. Its main function is to shape and amplify the signal to compensate for transmission losses, ensuring that the signal reaching the device remains clear and reliable. The USB 3.0 signal output from the GL3510 chip (with a bandwidth of 5Gbps) is physically cleaner and stronger, and logically more ordered and precise. The processed signal is then output to the USB 3.0 signal output processing module.

[0043] Furthermore, the USB 2.0 signal processing and switching module includes a USB 2.0 signal processing chip and a USB 2.0 signal switching chip, wherein: The controlled end of the USB 2.0 signal switching chip is electrically connected to the control end of the switching control circuit 101. The USB 2.0 signal receiving end of the USB 2.0 signal processing chip is used to electrically connect to the USB 2.0 signal transmitting end of all video input devices 104. The first output end of the USB 2.0 signal of the USB 2.0 signal processing chip is electrically connected to the USB 2.0 signal receiving end of the USB 2.0 signal switching chip. The USB 2.0 signal output end of the USB 2.0 signal switching chip is electrically connected to the USB signal conversion end of the USB 3.0 signal processing chip.

[0044] Among them, such as Figure 7 As shown, the USB 2.0 signal processing chip is likely a GL850S. It primarily shapes and amplifies the input USB 2.0 signal to compensate for transmission losses, ensuring a clear and reliable signal reaching the device. The USB 2.0 signal output by the GL850S chip is physically cleaner and stronger, and logically more ordered and precise. The processed signal outputs two USB 2.0 signals, one of which enters a USB 2.0 signal switching chip, and the other enters a virtualization processing module. Figure 8 As shown, the model of the USB 2.0 signal switching chip can be RS2228. It is mainly used to switch between two input USB 2.0 signals. There is no obvious difference between the input and output signals because it has a typical bandwidth of up to 480Mbps, which just meets the USB 2.0 480Mbps requirement. The high bandwidth means that the high frequency components can pass through the switch with almost no loss.

[0045] Furthermore, the virtualization processing module includes a virtualization processing chip, wherein: The controlled end of the virtualization processing chip is electrically connected to the control end of the switching control circuit 101. The USB signal conversion end of the virtualization processing chip is electrically connected to the second USB 2.0 signal output end of the USB 2.0 signal processing chip. The USB 1.1 signal output end of the virtualization processing chip is used to electrically connect to the USB signal receiving end of the keyboard and mouse device.

[0046] Among them, such as Figure 9As shown, the virtualization processing chip may be model CH9372B. This CH9372B chip uses virtualization technology to "disguise" itself as an independent keyboard and mouse in front of each connected video input device 104 (such as a smart computer), thereby achieving targeted data forwarding and seamless switching of a real keyboard and mouse. The output signal is a USB 1.1 signal with a bandwidth of only 12Mbps, and the processed signal is transmitted to a USB 1.1 signal output processing module (the USB 1.1 signal output terminal of the virtualization processing module can be electrically connected to the USB signal receiving terminal of the keyboard and mouse device through the USB 1.1 signal output processing module, and the USB 1.1 signal output processing module may include ESD protection circuitry, current limiting protection circuitry, common-mode rejection circuitry, and a USB connector to connect USB 1.1 devices such as mice and keyboards).

[0047] Furthermore, such as Figure 10 As shown, the switching control circuit 101 includes an MCU control module, which may include a GD32C221C8T6 chip and peripheral circuits. The GD32C221C8T6 chip can be used to process the switching states of the PI3HDX12221ZLDEX, PS8461E, AW3410 and RS2228 chips mentioned above.

[0048] As can be seen, this optional embodiment can achieve efficient switching and shaping amplification of USB 3.0 and USB 2.0 signals by integrating a USB 3.0 signal switching and processing module, a USB 2.0 signal processing and switching module, and a virtualization processing module. This ensures stable and secure transmission of USB 3.0 and USB 2.0 signals, thereby supporting seamless connection of high-speed devices such as USB flash drives and cameras, as well as seamless switching of keyboard and mouse signals between multiple video input devices, providing users with a smoother and more convenient multi-device management experience.

[0049] The following is Figure 2 Taking this example, the switching process of video signals, USB 3.0 signals, and USB 2.0 / 1.1 signals implemented by the signal switching device supporting multi-channel video output in this embodiment of the invention will be explained: 1. Control the switching of video signals (HDMI / DP) This is the core task of the MCU: determining which video stream is displayed on the monitor.

[0050] (1) Controlled objects: HDMI2.1 Video Switch (PI3HDX12221ZLDEX) and two DP1.4 Video Switches (PS8461E-A3).

[0051] (2) Control process: Receive command: The MCU detects that the user has pressed the switch button (or receives the switch command through other means). Logical decision: The MCU determines which computer to switch to (e.g., switching from PC1 to PC2).

[0052] (3) Issue instructions: For the HDMI switch, the MCU configures its internal registers through simple GPIO levels, telling it to switch to the PC2 input channel; For the DP switch, the MCU also controls the PS8461E through GPIO to connect the DP signal of PC2 to Monitor2 and Monitor3.

[0053] Auxiliary operation: In order to ensure that the display can be correctly recognized, the MCU may control the HPD (hot-plug detection) pin to simulate the action of "re-plugging" the display, forcing the computer to re-output the video signal.

[0054] 2. Control the switching of USB 3.0 signals It is responsible for switching the path of high-speed USB devices (such as USB flash drives and cameras).

[0055] (1) Controlled object: USB3.0 Analog Switch (AW3410).

[0056] (2) Control process: The MCU sends high and low level signals to the AW3410 through the GPIO port (for example, high level to select PC1, low level to select PC2). The analog switch quickly switches the physical USB 3.0 port from one computer's line to another computer's line.

[0057] 3. Control USB 2.0 / 1.1 keyboard and mouse signals (core KVM logic) It is responsible for handling the seamless switching between keyboard and mouse. This part of the logic is relatively complex and involves a dedicated KVM control chip.

[0058] (1) Controlled objects: USB2.0 Analog Switch (BL1530) and USB2.0 2-port USB KVMcontrol (CH9372B).

[0059] (2) Control process: Synergistic with CH9372B: The MCU communicates with the CH9372B via I²C or GPIO. The CH9372B itself is an intelligent chip that handles keyboard and mouse virtualization.

[0060] The MCU notifies CH9372B: "Switch to PC2 now."

[0061] The CH9372B internally performs complex protocol processing to seamlessly transfer the keyboard and mouse data stream from PC1 to PC2 (this process is transparent to the computer, and the computer will not feel the device disconnection).

[0062] Controlling USB 2.0 physical switching: At the same time, the MCU may also control the BL1530 (USB 2.0 analog switch) via GPIO, working with the CH9372B to complete the physical path switching of low-speed signals.

[0063] In addition, the MCU can also realize system status management and monitoring processes, including: Status input: The MCU monitors the button status in real time (which toggle button is pressed), and may also monitor some EDID (Extended Display Identification Data, i.e., display resolution information) or HDMI 5V detection signals to understand the device connection status; Status output: Based on the current channel status, the MCU controls the LED indicator to turn on or off, telling the user whether PC1 or PC2 is currently in use.

[0064] Example 2 Please see Figure 11 , Figure 11 This is a flowchart illustrating a signal switching method supporting multi-channel video output disclosed in an embodiment of the present invention. This device can be applied to scenarios requiring the control and management of multiple servers or computer hosts, such as office scenarios, financial transaction scenarios, monitoring and command scenarios, industrial control scenarios, etc. The method is applied to a signal switching device supporting multi-channel video output, which includes a switching control circuit, a video signal switching circuit, and a USB signal switching circuit, wherein: The control terminal of the switching control circuit is electrically connected to the controlled terminal of the video signal switching circuit and the controlled terminal of the USB signal switching circuit. The video signal receiving end of the video signal switching circuit is used to electrically connect the video signal transmitting end of multiple video input devices, and the video signal output end of the video signal switching circuit is used to electrically connect the video signal receiving end of the display device. The USB signal receiving end of the USB signal switching circuit is used to electrically connect to the USB signal transmitting end of all video input devices, and the USB signal output end of the USB signal switching circuit is used to electrically connect to the USB signal receiving end of the USB signal device. The method includes: 201. The switching control circuit determines the video switching control command and the USB signal switching control command that match the target switching command based on the received target switching command, and sends the video switching control command to the video signal switching circuit and the USB signal switching control command to the USB signal switching circuit. 202. The video signal switching circuit performs switching processing on the video signals output by the target video input device among all video input devices according to the video switching control command, obtains the processed video signal, and transmits the processed video signal to the display device so that the display device displays the picture that matches the target video input device; 203. The USB signal switching circuit performs switching processing on the USB signal output by the target video input device according to the USB signal switching control command, obtains the processed USB signal, and conducts the signal path between the target video input device and the USB signal device through the processed USB signal, so as to perform keyboard and mouse operation and device data transmission operation on the target video input device.

[0065] As can be seen, implementing the embodiments of the present invention enables the switching of the video signal of the target video input device through a video signal switching circuit and according to the video switching control command received from the switching control circuit, and then transmitting the processed video signal to the display device to display the corresponding image; and, through a USB signal switching circuit and according to the USB signal switching control command received from the switching control circuit, the switching of the USB signal of the target video input device is performed to establish a signal path between the target video input device and the USB signal device, and keyboard and mouse operations and device data transmission operations are performed on the target video input device. This not only supports multiple independent video outputs, realizing three native HDMI 2.1 and DP1.4 independent outputs of KVM, breaking through the single-channel bandwidth limitation, and improving the accuracy of switching processing of video and USB signals, but also improves the video output effect and eliminates screen tearing and delay in multi-screen displays.

[0066] In an optional embodiment, the video signal switching circuit includes a differential signal switching module and a coordinated display signal switching module, wherein: The controlled end of the differential signal switching module and the controlled end of the collaborative display signal switching module are both electrically connected to the control end of the switching control circuit. The differential signal receiving end of the differential signal switching module is used to electrically connect to the differential signal transmitting end of all video input devices. The differential signal output end of the differential signal switching module is used to electrically connect to the differential signal receiving end of the display device. The collaborative display signal receiving end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal transmitting end of all video input devices. The collaborative display signal output end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal receiving end of the display device. The video signal switching circuit, according to the video switching control command, performs switching processing on the video signals output by the target video input device among all video input devices to obtain the processed video signal, and transmits the processed video signal to the display device, including: The differential signal switching module performs differential switching processing on the differential signals output by the target video input device in all video input devices according to the video switching control command, obtains the processed differential signal, and transmits the processed differential signal to the display device. The collaborative display signal switching module performs collaborative display switching processing on the collaborative display signal output by the target video input device according to the video switching control command, obtains the processed collaborative display signal, and transmits the processed collaborative display signal to the display device.

[0067] In this optional embodiment, the differential switching processing operation includes a first gain operation, a first phase compensation operation, and a first frame interpolation operation; the cooperative display signal includes a hot-plug detection signal and auxiliary channel positive and negative signals, and the cooperative display switching processing operation includes a second gain operation, a second phase compensation operation, and a second frame interpolation operation.

[0068] As can be seen, this optional embodiment can achieve adaptive gain adjustment, dynamic phase compensation and intelligent frame interpolation of various video signals by integrating a differential signal switching module and a collaborative display signal switching module, so as to ensure the smooth and stable transmission of ultra-high-definition video signals to the display device, thereby improving the compatibility and stability of the overall system's multi-channel video switching control.

[0069] In another optional embodiment, the USB signal switching circuit includes a USB 3.0 signal switching processing module, a USB 2.0 signal processing switching module, and a virtualization processing module, wherein: The controlled terminals of the USB3.0 signal switching module, the USB2.0 signal processing switching module, and the virtualization processing module are all electrically connected to the control terminal of the switching control circuit. The USB 3.0 signal receiving end of the USB 3.0 signal switching and processing module is used to electrically connect to the USB 3.0 signal transmitting end of all video input devices, and the USB 3.0 signal output end of the USB 3.0 signal switching and processing module is used to electrically connect to the USB signal receiving end of USB 3.0 signal devices. The USB 2.0 signal receiver of the USB 2.0 signal processing and switching module is used to electrically connect to the USB 2.0 signal transmitter of all video input devices, and the first output of the USB 2.0 signal of the USB 2.0 signal processing and switching module is electrically connected to the USB signal conversion terminal of the USB 3.0 signal switching and processing module. The USB signal conversion terminal of the virtualization processing module is electrically connected to the second USB 2.0 signal output terminal of the USB 2.0 signal processing switching module, and the USB 1.1 signal output terminal of the virtualization processing module is used to electrically connect to the USB signal receiving terminal of the keyboard and mouse device. The USB signal switching circuit, according to the USB signal switching control command, performs switching processing on the USB signal output by the target video input device to obtain a processed USB signal. This processed USB signal then establishes the signal path between the target video input device and the USB signal device, enabling keyboard and mouse operations and data transfer operations on the target video input device, including: The USB 3.0 signal switching processing module switches the USB 3.0 signal output by the target video input device according to the USB signal switching control command, and performs shaping and amplification processing on the USB 3.0 signal to obtain the first processed USB 3.0 signal; The USB 2.0 signal processing and switching module shapes and amplifies the USB 2.0 signals output by all video input devices to obtain the processed USB 2.0 signals corresponding to all video input devices. According to the USB signal switching control command, it switches the processed USB 2.0 signal corresponding to the target video input device to transmit the processed USB 2.0 signal corresponding to the target video input device to the USB 3.0 signal switching and processing module. The USB 3.0 signal switching and processing module shapes and amplifies the processed USB 2.0 signal corresponding to the target video input device to obtain a second processed USB 3.0 signal. Through the first processed USB 3.0 signal and the second processed USB 3.0 signal, the signal path between the target video input device and the USB 3.0 signal device is opened to perform device data transmission operation on the target video input device. The virtualization processing module converts the processed USB 2.0 signal corresponding to the target video input device into a USB 1.1 signal according to the USB signal switching control command. Then, it connects the signal path between the target video input device and the keyboard and mouse device through the USB 1.1 signal to enable keyboard and mouse operation on the target video input device.

[0070] As can be seen, this optional embodiment can achieve efficient switching and shaping amplification of USB 3.0 and USB 2.0 signals by integrating a USB 3.0 signal switching and processing module, a USB 2.0 signal processing and switching module, and a virtualization processing module. This ensures stable and secure transmission of USB 3.0 and USB 2.0 signals, thereby supporting seamless connection of high-speed devices such as USB flash drives and cameras, as well as seamless switching of keyboard and mouse signals between multiple video input devices, providing users with a smoother and more convenient multi-device management experience.

[0071] Example 3 Please see Figure 12 , Figure 12 This is a schematic diagram of a KVM switch disclosed in an embodiment of the present invention. The KVM switch includes a device housing and a circuit board. The circuit board includes any of the signal switching devices supporting multi-channel video output as described in Embodiment 1. This KVM switch can be applied to scenarios requiring control and management of multiple servers or computer hosts, such as office scenarios, financial transaction scenarios, monitoring and command scenarios, industrial control scenarios, etc. It should be noted that for a detailed description of the signal switching device supporting multi-channel video output, please refer to the specific description in Embodiment 1; it will not be repeated in this embodiment.

[0072] It should be noted that, addressing the technical shortcomings of MST (Multi-Stream Transport) such as high latency, poor DisplayLink image quality, and lack of 8K support, a KVM switch based on hardware virtualization and video stream pass-through architecture is provided. This switch can virtualize a complete display controller for each user at the hardware level and establish a minimized, low-latency video path from the host GPU frame buffer to the user's display, thereby achieving three independent, native-quality, ultra-low-latency 8K video output.

[0073] It is evident that implementation Figure 12 The described KVM switcher can switch the video signal of the target video input device according to video switching control commands, and transmit the processed video signal to the display device to display the corresponding image; and, according to USB signal switching control commands, switch the USB signal of the target video input device to establish a signal path between the target video input device and the USB signal device, and perform keyboard and mouse operations and device data transfer operations on the target video input device. It not only supports multiple independent video outputs, achieving three native HDMI 2.1 and DP1.4 independent outputs from the KVM switch, breaking through single-channel bandwidth limitations and improving the accuracy of video and USB signal switching, but also improves video output quality and eliminates screen tearing and latency in multi-screen displays.

[0074] The foregoing has provided a detailed description of a signal switching device, method, and KVM switch that supports multi-channel video output, as disclosed in the embodiments of the present invention. Specific embodiments have been used to illustrate the principles and implementation methods of the present invention. However, the above preferred embodiments are not intended to limit the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is defined by the scope of the claims.

Claims

1. A signal switching device supporting multi-channel video output, characterized in that, The device includes a switching control circuit, a video signal switching circuit, and a USB signal switching circuit, wherein: The control terminal of the switching control circuit is electrically connected to the controlled terminal of the video signal switching circuit and the controlled terminal of the USB signal switching circuit. The video signal receiving end of the video signal switching circuit is used to electrically connect to the video signal transmitting end of multiple video input devices, and the video signal output end of the video signal switching circuit is used to electrically connect to the video signal receiving end of the display device. The USB signal receiving end of the USB signal switching circuit is used to electrically connect to the USB signal transmitting end of all the video input devices, and the USB signal output end of the USB signal switching circuit is used to electrically connect to the USB signal receiving end of the USB signal device. The switching control circuit is configured to determine, based on the received target switching instruction, a video switching control instruction and a USB signal switching control instruction that match the target switching instruction, and send the video switching control instruction to the video signal switching circuit and the USB signal switching control instruction to the USB signal switching circuit. The video signal switching circuit is used to perform switching processing on the video signals output by the target video input device among all the video input devices according to the video switching control command, to obtain the processed video signal, and to transmit the processed video signal to the display device so that the display device displays the image that matches the target video input device; The USB signal switching circuit is used to perform switching processing on the USB signal output by the target video input device according to the USB signal switching control command, to obtain a processed USB signal, and to conduct the signal path between the target video input device and the USB signal device through the processed USB signal, so as to perform keyboard and mouse operation and device data transmission operation on the target video input device.

2. The signal switching device supporting multi-channel video output according to claim 1, characterized in that, The video signal switching circuit includes a differential signal switching module and a coordinated display signal switching module, wherein: The controlled end of the differential signal switching module and the controlled end of the collaborative display signal switching module are both electrically connected to the control end of the switching control circuit. The differential signal receiving end of the differential signal switching module is used to electrically connect to the differential signal transmitting end of all the video input devices. The differential signal output end of the differential signal switching module is used to electrically connect to the differential signal receiving end of the display device. The collaborative display signal receiving end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal transmitting end of all the video input devices. The collaborative display signal output end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal receiving end of the display device. The differential signal switching module is used to perform differential switching processing on the differential signals output by the target video input device among all the video input devices according to the video switching control command, to obtain the processed differential signal, and to transmit the processed differential signal to the display device; the differential switching processing operation includes a first gain operation, a first phase compensation operation, and a first frame interpolation operation; The collaborative display signal switching module is used to perform collaborative display switching processing on the collaborative display signal output by the target video input device according to the video switching control command, to obtain the processed collaborative display signal, and to transmit the processed collaborative display signal to the display device; the collaborative display signal includes a hot-plug detection signal and auxiliary channel positive and negative signals, and the collaborative display switching processing operation includes a second gain operation, a second phase compensation operation, and a second frame interpolation operation.

3. The signal switching device supporting multi-channel video output according to claim 2, characterized in that, The USB signal switching circuit includes a USB 3.0 signal switching processing module, a USB 2.0 signal processing switching module, and a virtualization processing module, wherein: The controlled terminals of the USB 3.0 signal switching module, the USB 2.0 signal processing switching module, and the virtualization processing module are all electrically connected to the control terminal of the switching control circuit. The USB 3.0 signal receiving end of the USB 3.0 signal switching processing module is used to electrically connect to the USB 3.0 signal transmitting end of all the video input devices, and the USB 3.0 signal output end of the USB 3.0 signal switching processing module is used to electrically connect to the USB signal receiving end of the USB 3.0 signal device. The USB2.0 signal receiving end of the USB2.0 signal processing and switching module is used to electrically connect to the USB2.0 signal transmitting end of all the video input devices, and the first output end of the USB2.0 signal of the USB2.0 signal processing and switching module is electrically connected to the USB signal conversion end of the USB3.0 signal switching and processing module. The USB signal conversion terminal of the virtualization processing module is electrically connected to the second USB 2.0 signal output terminal of the USB 2.0 signal processing switching module, and the USB 1.1 signal output terminal of the virtualization processing module is used to electrically connect to the USB signal receiving terminal of the keyboard and mouse device. The USB 3.0 signal switching processing module is used to switch the USB 3.0 signal output by the target video input device according to the USB signal switching control command, and to perform shaping and amplification processing on the USB 3.0 signal to obtain a first processed USB 3.0 signal; The USB 2.0 signal processing and switching module is used to shape and amplify the USB 2.0 signals output by all the video input devices to obtain the processed USB 2.0 signals corresponding to all the video input devices, and to switch the processed USB 2.0 signal corresponding to the target video input device according to the USB signal switching control command, so as to transmit the processed USB 2.0 signal corresponding to the target video input device to the USB 3.0 signal switching and processing module; The USB 3.0 signal switching processing module is further configured to perform shaping and amplification processing on the processed USB 2.0 signal corresponding to the target video input device to obtain a second processed USB 3.0 signal, and to conduct the signal path between the target video input device and the USB 3.0 signal device through the first processed USB 3.0 signal and the second processed USB 3.0 signal, so as to perform device data transmission operation on the target video input device; The virtualization processing module is used to convert the processed USB 2.0 signal corresponding to the target video input device into a USB 1.1 signal corresponding to the target video input device according to the USB signal switching control command, and to connect the signal path between the target video input device and the keyboard and mouse device through the USB 1.1 signal so as to perform keyboard and mouse operation on the target video input device.

4. The signal switching device supporting multi-channel video output according to claim 3, characterized in that, The USB 3.0 signal switching and processing module includes a USB 3.0 signal switching chip and a USB 3.0 signal processing chip, wherein: The controlled terminal of the USB 3.0 signal switching chip is electrically connected to the control terminal of the switching control circuit. The USB 3.0 signal receiving terminal of the USB 3.0 signal switching chip is used to electrically connect to the USB 3.0 signal transmitting terminal of all the video input devices. The USB 3.0 signal output terminal of the USB 3.0 signal switching chip is electrically connected to the USB 3.0 signal receiving terminal of the USB 3.0 signal processing chip. The USB 3.0 signal output terminal of the USB 3.0 signal processing chip is used to electrically connect to the USB signal receiving terminal of the USB 3.0 signal device.

5. The signal switching device supporting multi-channel video output according to claim 4, characterized in that, The USB 2.0 signal processing and switching module includes a USB 2.0 signal processing chip and a USB 2.0 signal switching chip, wherein: The controlled terminal of the USB 2.0 signal switching chip is electrically connected to the control terminal of the switching control circuit. The USB 2.0 signal receiving terminal of the USB 2.0 signal processing chip is used to electrically connect to the USB 2.0 signal transmitting terminals of all the video input devices. The first USB 2.0 signal output terminal of the USB 2.0 signal processing chip is electrically connected to the USB 2.0 signal receiving terminal of the USB 2.0 signal switching chip. The USB 2.0 signal output terminal of the USB 2.0 signal switching chip is electrically connected to the USB signal conversion terminal of the USB 3.0 signal processing chip.

6. The signal switching device supporting multi-channel video output according to claim 5, characterized in that, The virtualization processing module includes a virtualization processing chip, wherein: The controlled terminals of the virtualization processing chip are all electrically connected to the control terminals of the switching control circuit. The USB signal conversion terminal of the virtualization processing chip is electrically connected to the second USB 2.0 signal output terminal of the USB 2.0 signal processing chip. The USB 1.1 signal output terminal of the virtualization processing chip is used to electrically connect to the USB signal receiving terminal of the keyboard and mouse device.

7. A signal switching method supporting multi-channel video output, characterized in that, The method is applied to a signal switching device supporting multi-channel video output, characterized in that the device includes a switching control circuit, a video signal switching circuit, and a USB signal switching circuit, wherein: The control terminal of the switching control circuit is electrically connected to the controlled terminal of the video signal switching circuit and the controlled terminal of the USB signal switching circuit. The video signal receiving end of the video signal switching circuit is used to electrically connect to the video signal transmitting end of multiple video input devices, and the video signal output end of the video signal switching circuit is used to electrically connect to the video signal receiving end of the display device. The USB signal receiving end of the USB signal switching circuit is used to electrically connect to the USB signal transmitting end of all the video input devices, and the USB signal output end of the USB signal switching circuit is used to electrically connect to the USB signal receiving end of the USB signal device. The method includes: The switching control circuit determines a video switching control command and a USB signal switching control command that match the received target switching command, and sends the video switching control command to the video signal switching circuit and the USB signal switching control command to the USB signal switching circuit. The video signal switching circuit performs switching processing on the video signals output by the target video input device among all the video input devices according to the video switching control command, obtains the processed video signal, and transmits the processed video signal to the display device so that the display device displays the image that matches the target video input device; The USB signal switching circuit performs switching processing on the USB signal output by the target video input device according to the USB signal switching control command, obtains a processed USB signal, and conducts the signal path between the target video input device and the USB signal device through the processed USB signal, so as to perform keyboard and mouse operation and device data transmission operation on the target video input device.

8. The signal switching method supporting multi-channel video output according to claim 7, characterized in that, The video signal switching circuit includes a differential signal switching module and a coordinated display signal switching module, wherein: The controlled end of the differential signal switching module and the controlled end of the collaborative display signal switching module are both electrically connected to the control end of the switching control circuit. The differential signal receiving end of the differential signal switching module is used to electrically connect to the differential signal transmitting end of all the video input devices. The differential signal output end of the differential signal switching module is used to electrically connect to the differential signal receiving end of the display device. The collaborative display signal receiving end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal transmitting end of all the video input devices. The collaborative display signal output end of the collaborative display signal switching module is used to electrically connect to the collaborative display signal receiving end of the display device. The video signal switching circuit, according to the video switching control command, performs switching processing on the video signals output by the target video input device among all the video input devices to obtain a processed video signal, and transmits the processed video signal to the display device, including: The differential signal switching module performs differential switching processing on the differential signals output by the target video input devices in all the video input devices according to the video switching control command, obtains the processed differential signal, and transmits the processed differential signal to the display device; the differential switching processing operation includes a first gain operation, a first phase compensation operation, and a first frame interpolation operation; The collaborative display signal switching module performs collaborative display switching processing on the collaborative display signal output by the target video input device according to the video switching control command, obtains the processed collaborative display signal, and transmits the processed collaborative display signal to the display device; the collaborative display signal includes a hot-plug detection signal and auxiliary channel positive and negative signals, and the collaborative display switching processing operation includes a second gain operation, a second phase compensation operation, and a second frame interpolation operation.

9. The signal switching method supporting multi-channel video output according to claim 8, characterized in that, The USB signal switching circuit includes a USB 3.0 signal switching processing module, a USB 2.0 signal processing switching module, and a virtualization processing module, wherein: The controlled terminals of the USB 3.0 signal switching module, the USB 2.0 signal processing switching module, and the virtualization processing module are all electrically connected to the control terminal of the switching control circuit. The USB 3.0 signal receiving end of the USB 3.0 signal switching processing module is used to electrically connect to the USB 3.0 signal transmitting end of all the video input devices, and the USB 3.0 signal output end of the USB 3.0 signal switching processing module is used to electrically connect to the USB signal receiving end of the USB 3.0 signal device. The USB2.0 signal receiving end of the USB2.0 signal processing and switching module is used to electrically connect to the USB2.0 signal transmitting end of all the video input devices, and the first output end of the USB2.0 signal of the USB2.0 signal processing and switching module is electrically connected to the USB signal conversion end of the USB3.0 signal switching and processing module. The USB signal conversion terminal of the virtualization processing module is electrically connected to the second USB 2.0 signal output terminal of the USB 2.0 signal processing switching module, and the USB 1.1 signal output terminal of the virtualization processing module is used to electrically connect to the USB signal receiving terminal of the keyboard and mouse device. The USB signal switching circuit, according to the USB signal switching control command, performs switching processing on the USB signal output by the target video input device to obtain a processed USB signal. Through the processed USB signal, it establishes a signal path between the target video input device and the USB signal device to enable keyboard and mouse operations and data transmission operations on the target video input device, including: The USB 3.0 signal switching processing module switches the USB 3.0 signal output by the target video input device according to the USB signal switching control command, and performs shaping and amplification processing on the USB 3.0 signal to obtain the first processed USB 3.0 signal; The USB 2.0 signal processing and switching module shapes and amplifies the USB 2.0 signals output by all the video input devices to obtain the processed USB 2.0 signals corresponding to all the video input devices. According to the USB signal switching control command, it switches the processed USB 2.0 signal corresponding to the target video input device to transmit the processed USB 2.0 signal corresponding to the target video input device to the USB 3.0 signal switching and processing module. The USB 3.0 signal switching processing module shapes and amplifies the processed USB 2.0 signal corresponding to the target video input device to obtain a second processed USB 3.0 signal. Through the first processed USB 3.0 signal and the second processed USB 3.0 signal, the signal path between the target video input device and the USB 3.0 signal device is established to perform device data transmission operation on the target video input device. The virtualization processing module performs signal conversion on the processed USB 2.0 signal corresponding to the target video input device according to the USB signal switching control command, to obtain the USB 1.1 signal corresponding to the target video input device, and conducts the signal path between the target video input device and the keyboard and mouse device through the USB 1.1 signal, so as to perform keyboard and mouse operation on the target video input device.

10. A KVM switch, the KVM switch comprising a housing and a circuit board, characterized in that, The circuit board includes a signal switching device that supports multi-channel video output as described in any one of claims 1-6.

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