Method for realizing EDID emulation by level signal and DP switcher

Abstract

The present application relates to the technical field of switcher, in particular to a method for realizing EDID simulation through level signal and a DP switcher, comprising the steps of detecting the level state of a DP out HPD signal end in real time; outputting a high level to a DP in HPD signal end of the first channel when detecting that the DP out HPD signal end of the first channel is at high level; generating an IRQ_HPD request signal in the second channel corresponding DP in HPD signal end after a preset waiting time after receiving a channel switching instruction; continuously maintaining the first channel DP in HPD signal end at high level in the process of switching the first channel to the second channel, realizing EDID simulation; by maintaining the original channel DP in HPD signal end at high level in the process of channel switching, avoiding the problems of screen flashing, window rearrangement, resolution resetting and the like, realizing EDID simulation only through the self-control module, without relying on expensive FPGA chips and without additionally increasing other hardware circuits, not only simplifying the hardware structure of the DP switcher, but also reducing the hardware and research and development cost of the DP switcher.

Description

Technical Field

[0001] This invention relates to the field of switch technology, and in particular to a method for simulating EDID using level signals and a DP switch. Background Technology

[0002] DisplayPort (DP) switches are core components of multi-host shared display devices. Currently, most DP switches and DPKVM switching products on the market do not support EDID emulation technology. When the switch is switching channels, the computer on the current channel thinks the monitor has been lost, resulting in screen flickering and a rearranged desktop window layout, leading to a poor user experience. Some high-end switches use FPGA chips to simulate a continuous connection to the monitor, thus solving the flickering problem. However, due to the high cost of FPGA chips and the requirement for an independent FPGA for each channel, the overall cost of the switch increases significantly, making it difficult to meet the market's core demand for low cost and high user experience.

[0003] Therefore, there is an urgent need to design a low-cost solution with EDID simulation capabilities to meet market demands. Summary of the Invention

[0004] This invention provides a method for EDID simulation using level signals and a DP switch to solve the problem of difficulty in achieving low cost and high user experience in the prior art.

[0005] This invention discloses a method for EDID simulation using level signals. The method is applied to a DP switch, which includes a control module and a DP signal switching module. Both the DP out HPD signal terminal and the DP in HPD signal terminal of the DP signal switching module are connected to the control module. The EDID simulation method is implemented through the control module and specifically includes the following steps:

[0006] Real-time monitoring of the voltage level at the DP out HPD signal terminal; When a high level is detected at the DP out HPD signal terminal of the first channel, a high level is output to the DP in HPD signal terminal of the first channel; When a channel switching command is received, after a preset waiting time, an IRQ_HPD request signal is actively generated at the DP inHPD signal terminal corresponding to the second channel. During the switching from the first channel to the second channel, the DP inHPD signal terminal of the first channel is kept at a high level to achieve EDID simulation.

[0007] Optionally, the following steps are also included: When a channel switching command is received, the current operating mode is determined; Optionally, if the current operating mode is the preset normal switching mode, the level signal of the DP out HPD signal terminal is directly transmitted to the DP in HPD signal terminal.

[0008] If the current working mode is the preset EDID simulation mode, then the level status of the DP out HPD signal terminal is detected.

[0009] Optionally, the DP switch further includes a power supply module connected to the control module, and the EDID simulation method further includes the following steps: Real-time monitoring of the signal access status of the DP signal switching module; When a signal is detected to be connected to the DP signal switching module, the power module is turned on to enter the preset normal power supply mode; otherwise, the power module is turned off to enter the preset low power consumption mode.

[0010] Optionally, the DP switch further includes a USB switching module, which is connected to the control module. The EDID simulation method further includes the following steps: Real-time monitoring of the signal access status of the USB switching module; When a signal is detected from the USB switching module, the power module is turned on to enter the preset normal power supply mode; otherwise, the power module is turned off to enter the preset low power consumption mode.

[0011] Optionally, the following steps are also included: During the process of switching from the first channel to the second channel, the connection of the second channel is checked to see if it is normal. If the link is not properly connected, the IRQ_HPD request signal will be regenerated at the DP in HPD signal terminal corresponding to the second channel.

[0012] Optionally, the following steps are also included: When the number of times the IRQ_HPD request signal is regenerated reaches a preset threshold, a channel switching error warning is triggered and the system switches back to the first channel.

[0013] Optionally, the DP signal switching module receives at least two DP signals input from the host, and the control module controls the DP signal switching module to select a corresponding DP signal from the at least two DP signals input from the host and output it to the display device.

[0014] To address the problems existing in the prior art, the present invention also provides a DP switcher, which includes: a control module, a DP signal switching module, a USB signal switching module, and a power supply module. The DP signal switching module and the USB signal switching module are both connected to the control module, which is used to implement the EDID simulation method described above. The DP signal switching module receives at least two DP signals input from a host device, performs signal preprocessing, signal equalization, and signal amplification, and then outputs the signals to a display device. The USB signal switching module switches the channels of at least two USB signals input from a host device. The power supply module is connected to the control module, the DP signal switching module, and the USB signal switching module respectively for power supply.

[0015] Optionally, it also includes a USB power supply module, a USB hub module, and multiple USB ports, all of which are powered by the USB power supply module and connected to the output of the USB hub module to connect multiple external devices.

[0016] The beneficial effects of the EDID simulation method provided in this invention are as follows: by outputting a high level to the DP in HPD signal terminal when the DP out HPD signal terminal is detected to be high; when a channel switching command is received, a preset waiting time is first delayed, and then an IRQ_HPD request signal is actively generated on the DP in HPD signal terminal to wait for channel switching, and the DP in HPD signal terminal is kept at a high level during the channel switching process, ensuring that the host will not misjudge the loss of the display device during the channel switching process, avoiding problems such as screen flickering, desktop window rearrangement, and resolution reset, and improving the user experience; this solution does not rely on expensive FPGA chips or other dedicated hardware, nor does it require the addition of other hardware circuits. EDID simulation can be achieved solely through the control module built into the DP switch, which not only simplifies the hardware structure of the DP switch and reduces the difficulty of production and debugging, but also significantly reduces the hardware cost and R&D cost of the DP switch. Attached Figure Description

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is the flowchart of the EDID simulation method in the embodiments of the present invention. Figure 1 ; Figure 2 This is the flowchart of the EDID simulation method in the embodiments of the present invention. Figure 2 ; Figure 3 This is the flowchart of the EDID simulation method in the embodiments of the present invention. Figure 3 ; Figure 4 This is the flowchart of the EDID simulation method in the embodiments of the present invention. Figure 4 ; Figure 5 This is a schematic diagram of the DP switch in an embodiment of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the DP switch in an embodiment of the present invention. Figure 2 .

[0018] The labels for the attached figures are as follows: 1. Control module; 2. DP signal switching module; 3. USB signal switching module; 4. Power supply module; 5. USB power supply module; 6. USB hub module; 7. USB interface. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] like Figures 1 to 4 As shown, the present invention provides a specific embodiment of an EDID simulation method.

[0021] An EDID simulation method is proposed for a DP switch. The DP switch includes a control module and a DP signal switching module. Both the DP out HPD signal terminal and the DP in HPD signal terminal of the DP signal switching module are connected to the control module. The EDID simulation method is implemented through the control module. (See reference...) Figures 1 to 4 The EDID simulation method specifically includes the following steps: S1. Real-time detection of the level status of the DP out HPD signal terminal; S2. When the DP out HPD signal terminal of the first channel is detected to be high, a high level is output to the DP in HPD signal terminal of the first channel. S3. When a channel switching command is received, after a preset waiting time, an IRQ_HPD request signal is actively generated at the DP inHPD signal terminal corresponding to the second channel. S4. During the process of switching from the first channel to the second channel, the DP in HPD signal terminal of the first channel is kept at a high level to achieve EDID simulation.

[0022] Step 1: The control module presets a waiting time through internal software programming. This waiting time is used to ensure the stable transition of the DP signal link and avoid host link training failure due to insufficient timing. The control module also starts level status detection of the DP out HPD signal terminal and continuously monitors the level signal of the DP out HPD signal terminal.

[0023] Step 2: When the DP out HPD signal terminal of the first channel is detected to be high, immediately output a high level to the DP in HPD signal terminal of the first channel. The high level of the DP out HPD signal terminal of the first channel indicates that the device of the first channel is currently connected to the host and has been displaying the image. This ensures that the host can continuously detect the online status of the display device, so that the host thinks that it is always connected to the monitor and will not react.

[0024] Step 3: When the control module receives a channel switching command, which is a control signal that triggers the DP switcher to switch the host channel, the control module monitors and responds to the command in real time to switch the first channel to the second channel. When responding to the command, the control module first controls the delay to a preset waiting time, and then actively generates an IRQ_HPD request signal at the DPin HPD signal terminal corresponding to the second channel. After generating the request signal, the control module enters a waiting state, waiting for the host and display device to complete the channel switching. During the process of switching from the first channel to the second channel, the host can receive the second IRQ_HPD request signal through the DP signal switching module, and after receiving the IRQ_HPD request signal, it performs DP link / status checks and errors to guide the host to retrain and check the link until the link is stable and the image is displayed normally.

[0025] Step four: During the entire process of switching from the first channel to the second channel, the control module continuously keeps the DP in HPD signal terminal of the first channel at a high level, so that the host always thinks it is connected to the display during the channel switching process and will not reread the EDID or flicker, thereby realizing the function of EDID simulation.

[0026] The channel switching command is a control signal that triggers the DP switch to switch the host channel. It is monitored and responded to in real time by the control module. Specifically, it can be triggered by a physical button on the DP switch. The user presses the channel switching button to trigger a change in the button's level signal, such as from high level to low level or from low level to high level. This level change signal is a channel switching command that can be recognized by the control module.

[0027] In this embodiment, when the DP out HPD signal terminal is detected to be high, a high level is output to the DP in HPD signal terminal. When a channel switching command is received, a preset waiting time is first delayed, and then an IRQ_HPD request signal is actively generated on the DP in HPD signal terminal to wait for channel switching. During the channel switching process, the DP in HPD signal terminal is kept at a high level to ensure that the host will not misjudge the loss of the display device during the channel switching process, avoiding problems such as screen flickering, desktop window rearrangement, and resolution reset, thus improving the user experience. This solution does not rely on expensive dedicated hardware such as FPGA chips, nor does it require additional hardware circuits. EDID simulation can be achieved solely through the control module built into the DP switch, which not only simplifies the hardware structure of the DP switch and reduces the difficulty of production and debugging, but also significantly reduces the hardware cost and R&D cost of the DP switch.

[0028] In one embodiment, the IRQ_HPD request signal is a low-level pulse signal with a duration of 0.5ms-1ms. The control module, through internal timing logic, controls the DP-in-HPD signal terminal to switch from a high level to a low level instantaneously, hold for 0.5ms-1ms, and then switch back to a high level, forming a low-level pulse IRQ_HPD request signal. The duration of this pulse signal can be customized according to the specifications of the DP switcher and the application scenario, flexibly adjusted within the range of 0.5ms-1ms. This ensures that the host can accurately detect the request signal without causing detection failure due to abrupt pulses or link anomalies due to excessively long pulses. The low-level pulse signal design is easier for the host to recognize compared to other signal types and does not interfere with the high-level holding state of the DP-in-HPD signal terminal, ensuring the stability of EDID simulation.

[0029] In one embodiment, reference Figure 2 The EDID simulation method also includes the following steps: S21. Preset normal switching mode and EDID simulation mode; S22. When a channel switching command is received, determine the current working mode; S23. If the current working mode is the normal switching mode, the level signal of the DP out HPD signal terminal will be directly transmitted to the DP in HPD signal terminal. S24. If the current working mode is EDID simulation mode, then detect the level status of the DP out HPD signal terminal.

[0030] Specifically, the control module has two preset operating modes: a normal switching mode and an EDID simulation mode. Switching between these modes can be achieved through software configuration within the control module, and the default mode can be set according to actual needs. The control module monitors channel switching commands in real time. Upon receiving a channel switching command, it immediately initiates a judgment process for the current operating mode. By detecting the mode configuration signal within the control module, it determines the current operating mode. If the control module determines the current operating mode is the normal switching mode, it directly executes the level pass-through logic, that is, it directly passes the level signal from the DP out HPD signal terminal to the DP in HPD signal terminal, without needing to perform subsequent EDID simulation steps. If the control module determines the current operating mode is the EDID simulation mode, it executes the steps of the aforementioned EDID simulation method, that is, it detects the level state of the DP out HPD signal terminal, thereby completing the EDID simulation and channel switching.

[0031] The switching between the two working modes can be triggered by a hardware button or a software command. When the control module receives the switching command, it updates the internal mode configuration signal and completes the mode switching. The switching process does not affect the normal operation of the DP switcher.

[0032] This embodiment offers two preset working modes, allowing users to flexibly switch between them according to their actual needs. Users can choose the EDID simulation mode for high-quality switching without screen flickering or window reflow, or the regular switching mode to meet the needs of simple scenarios, thus enhancing the product's practicality and flexibility. The regular switching mode eliminates the need for complex EDID simulation timing control, simplifying the control logic, reducing the computational load on the control module, and saving energy. By adapting to the usage needs of different users and various application scenarios, the method's applicability is expanded, enhancing the product's market competitiveness.

[0033] In one embodiment, the preset waiting time ranges from 100ms to 200ms. When the DP switch is used to transmit high-resolution (such as 4K, 8K) audio and video signals, the waiting time can be set to 150ms-200ms to ensure that the DP signal link can complete a stable transition. When used to transmit ordinary resolution audio and video signals, the waiting time can be set to 100ms-150ms to shorten the channel switching time while ensuring stability. Users can adjust the specific values ​​through software configuration according to the actual application scenario.

[0034] In one embodiment, the DP switch further includes a power module connected to the control module, as shown in the reference. Figure 3 The EDID simulation method also includes the following steps: S61, preset normal power supply mode and low power consumption mode; S62. Real-time monitoring of the signal access status of the DP signal switching module; S63. When a signal is detected to be connected to the DP signal switching module, the power supply module is turned on to enter the normal power supply mode; otherwise, the power supply module is turned off to enter the low power consumption mode.

[0035] Specifically, the control module presets two power supply modes: normal power supply mode and low power mode. The normal power supply mode supplies power to each module when the DP switch is working normally, while the low power mode reduces energy consumption when the DP switch has no signal input. The control module monitors the signal input status of the DP signal switching module in real time. By detecting whether a host DP signal is connected to the input port of the DP signal switching module, it determines whether normal power supply is required. When the control module detects that the DP signal switching module has a signal input, it immediately outputs a control signal to control the power module to start the normal power supply mode, providing a stable power supply to the control module and the DP signal switching module, ensuring the normal execution of the EDID simulation method and channel switching function. When the control module detects that the DP signal switching module has no signal input, it outputs a control signal to control the power module to shut down some unnecessary power supply circuits and enter the low power mode, retaining only the monitoring function of the control module to reduce overall energy consumption.

[0036] This embodiment incorporates low-power control logic, enabling the DP switch to automatically switch power supply modes based on signal access status. This effectively reduces energy consumption when there is no signal access, meeting ERP regulations' requirements for low power consumption in electronic devices. The low-power mode only shuts down unnecessary power supply circuits, retaining the monitoring function of the control module to ensure a rapid response when a signal is received, switching back to normal power supply mode without affecting the user experience. No additional low-power control chip is required; power supply mode switching is achieved solely through the control module, simplifying the hardware structure and reducing hardware costs. Long-term use effectively saves energy, improves the product's energy-saving and environmental performance, enhances its market competitiveness, and is suitable for long-term standby applications such as office and industrial control systems.

[0037] In one embodiment, the DP switch further includes a USB switching module connected to the control module, see reference. Figure 4 The EDID simulation method also includes the following steps: S64. Real-time monitoring of the signal access status of the USB switching module; S65. When a signal is detected from the USB switching module, the power module is turned on to enter the normal power supply mode; otherwise, the power module is turned off to enter the low power consumption mode.

[0038] Specifically, while monitoring the signal access status of the DP signal switching module in real time, the control module simultaneously monitors the signal access status of the USB switching module. By detecting whether a host USB signal is connected to the uplink port of the USB switching module, it determines whether the USB peripheral is in working condition. When the control module detects that the USB switching module has a signal connection, it outputs a control signal to control the power module to start the normal power supply mode, regardless of whether the DP signal switching module has a signal connection, ensuring that both the USB peripheral and the DP switching function can work normally. When the control module detects that neither the USB nor the DP signal switching module has a signal connection, it outputs a control signal to control the power module to enter a low-power mode. If the USB switching module has no signal connection but the DP signal switching module has a signal connection, the normal power supply mode is maintained.

[0039] This embodiment implements low-power control linked to USB and DP signals, making low-power judgment more comprehensive and accurate. It avoids the problem of USB peripherals failing to work properly or wasting energy due to monitoring only the DP signal. It ensures that the power module can turn on and supply power normally in a timely manner when a USB peripheral is connected, guaranteeing the stability of USB signal switching and peripheral use, and improving the user experience. It only enters low-power mode when neither DP nor USB signals are connected, which minimizes energy consumption without affecting the normal use of the device, balancing energy saving, environmental protection, and practicality. The linkage control logic is simple and can be implemented through the control module without the need for additional control circuitry, further simplifying the hardware structure and reducing R&D and production costs.

[0040] In one embodiment, the DP signal switching module receives at least two DP signals input from the host, and the control module controls the DP signal switching module to select the corresponding DP signal from the at least two DP signals input from the host and output it to the display device.

[0041] Specifically, the DP signal switching module is equipped with at least two host DP input ports to receive at least two host input DP signals (including audio and video signals); the control module executes DP signal switching control logic synchronously while performing the EDID simulation method described above; when the control module receives a channel switching command and starts the EDID simulation process, it outputs a switching control signal to the DP signal switching module according to the specific content of the channel switching command (such as the host channel selected by the user); after receiving the control signal, the DP signal switching module selects one or more DP signals corresponding to the channel switching command from the at least two host input DP signals, processes the signals, and outputs them to the display device, thereby realizing the coordinated execution of multi-host DP signal switching and EDID simulation.

[0042] This embodiment achieves coordinated execution of EDID simulation and DP signal switching, ensuring that there are no issues such as screen flickering or window reordering during the switching process, and that the DP signal switching can be completed quickly, improving switching efficiency and user experience; it supports at least two host DP signal inputs, and the number of input ports can be expanded according to actual needs, adapting to usage scenarios with different numbers of hosts, and has strong versatility; the control module executes two logics simultaneously, without the need to add an additional control unit, simplifying the control process, reducing the computational load of the control module, and ensuring a stable and smooth switching process.

[0043] In one embodiment, the EDID simulation method further includes detecting whether the link of the second channel is properly connected during the switching process from the first channel to the second channel; if the link is not properly connected, the IRQ_HPD request signal is regenerated at the DP in HPD signal terminal corresponding to the second channel; that is, the connection status of the second channel DP link is detected in real time during the channel switching process. When the link handshake fails, the timing is abnormal, or the signal is not established, the IRQ_HPD request signal is actively regenerated to trigger the host and the display device to re-handshake and negotiate, so as to avoid problems such as no picture, black screen, and failure to recognize the display after switching. By issuing the HPD interrupt request twice, the EDID information can be forcibly reread and the link training can be completed, ensuring that the EDID simulation is not interrupted; furthermore, when the number of times the IRQ_HPD request signal is regenerated reaches a preset threshold When the second channel fails to establish a link, a channel switching error warning is triggered and the system switches back to the first channel. This means that a preset threshold is set for the number of times the IRQ_HPD request signal can be retransmitted. Once the threshold is reached, the system will stop retrying repeatedly to prevent the second channel from getting stuck in an infinite loop of sending requests and handshaking. This also prevents the DP switcher program from freezing or the channel from locking up. When the second channel fails to establish a link after multiple handshaking attempts, a channel switching error warning is triggered. This warning can be displayed to the user or host computer via indicator lights, reporting signals, etc., indicating that the second channel has a link failure, peripheral incompatibility, or poor line contact. This facilitates quick location of the fault and improves the maintainability of the equipment.

[0044] like Figure 5 As shown, the present invention also provides a specific embodiment of a DP switch.

[0045] A DP switch, reference Figure 5The DP switcher includes a control module 1, a DP signal switching module 2, a USB signal switching module 3, and a power module 4. Both the DP signal switching module 2 and the USB signal switching module 3 are connected to the control module 1, which is used to implement the EDID simulation method described above. The DP signal switching module 2 is used to receive at least two DP signals input from the host, and performs signal preprocessing, signal equalization, and signal amplification before outputting them to the display device. The USB signal switching module 3 is used to switch the channels of at least two USB signals input from the host. The power module 4 is connected to the control module 1, the DP signal switching module 2, and the USB signal switching module 3 respectively to provide power.

[0046] Specifically, control module 1, as the core control unit of the DP switcher, is electrically connected to DP signal switching module 2, USB signal switching module 3, and power module 4 respectively. It is used to implement the above-mentioned EDID simulation method and is also responsible for the timing control, status monitoring, and logic scheduling of each module. DP signal switching module 2 is electrically connected to control module 1 and is equipped with at least two host DP input ports and at least one display device DP output port. It is used to receive at least two host input DP signals, perform signal preprocessing, signal equalization, and signal amplification on the received DP signals to eliminate interference and attenuation during signal transmission, and then output the selected DP signal to the display device according to the control signal of control module 1. USB signal switching module 3 is electrically connected to control module 1. It has at least two host USB input ports and several USB output ports to receive at least two USB signals (including USB 3.0 / 2.0 signals) from the host. According to the control signal of control module 1, it completes the channel switching of USB signals to realize the sharing of USB peripherals by multiple hosts. Power module 4 is electrically connected to control module 1, DP signal switching module 2 and USB signal switching module 3 respectively. It is used to convert the external input voltage into the working voltage required by each module and provide stable power supply to each module. At the same time, according to the control signal of control module 1, it switches between normal power supply mode and low power mode. Among them, the DP out HPD signal terminal and DP in HPD signal terminal of DP signal switching module 2 are both electrically connected to control module 1 to ensure that control module 1 can realize the detection, output and hold of HPD signal and complete the EDID simulation function.

[0047] In this embodiment, by directly connecting the DP out HPD signal terminal and the DP in HPD signal terminal of the DP signal switching module 2 to the control module 1 inside the DP switch, there is no need to configure an FPGA chip. The EDID simulation function is realized only through the control module 1, which greatly reduces the hardware cost and R&D cost of the DP switch. At the same time, it simplifies the hardware structure, reduces the difficulty of production and debugging, and facilitates large-scale popularization.

[0048] In one embodiment, reference Figure 6 The DP switch also includes a USB power supply module 5, a USB hub module 6, and multiple USB ports 7. All USB ports 7 are powered by the USB power supply module 5 and connected to the output of the USB hub module 6 to connect multiple external devices. This embodiment leverages the expansion capabilities of the USB hub module 6 to expand a small number of USB input ports 7 into multiple USB output ports 7, solving the problem of limited USB ports on a single DP switch. This allows multiple external devices to be connected simultaneously, meeting the user's need for multi-device collaboration (such as simultaneously connecting a keyboard, mouse, and mobile storage device). When the DP channel is switched (switching between different host inputs), the USB ports can synchronously switch with the host, ensuring normal communication between external USB devices and the currently operating DP host, without affecting user operation continuity and improving the overall user experience.

[0049] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of the present invention.

Claims

1. A method for EDID simulation using level signals, characterized in that, The method is applied to a DP switch, which includes a control module and a DP signal switching module. The DP out HPD signal terminal and the DP in HPD signal terminal of the DP signal switching module are both connected to the control module. The EDID simulation method specifically includes the following steps: Real-time monitoring of the voltage level at the DP out HPD signal terminal; When a high level is detected at the DP out HPD signal terminal of the first channel, a high level is output to the DP in HPD signal terminal of the first channel; When a channel switching command is received, after a preset waiting time, an IRQ_HPD request signal is actively generated at the DP in HPD signal terminal corresponding to the second channel. During the switching from the first channel to the second channel, the DP in HPD signal terminal of the first channel is kept at a high level to achieve EDID simulation.

2. The method for EDID simulation using level signals according to claim 1, characterized in that, It also includes the following steps: When a channel switching command is received, the current operating mode is determined; If the current working mode is the preset EDID simulation mode, then the level status of the DP out HPD signal terminal is detected.

3. The method for EDID simulation using level signals according to claim 2, characterized in that, It also includes the following steps: If the current working mode is the preset normal switching mode, the level signal of the DP out HPD signal terminal will be directly transmitted to the DP in HPD signal terminal.

4. The method for EDID simulation using level signals according to claim 1, characterized in that, The DP switch also includes a power module, which is connected to the control module. The EDID simulation method further includes the following steps: Real-time monitoring of the signal access status of the DP signal switching module; When a signal is detected to be connected to the DP signal switching module, the power module is turned on to enter the preset normal power supply mode; otherwise, the power module is turned off to enter the preset low power consumption mode.

5. The method for EDID simulation using level signals according to claim 4, characterized in that, The DP switch also includes a USB switching module, which is connected to the control module. The EDID simulation method further includes the following steps: Real-time monitoring of the signal access status of the USB switching module; When a signal is detected from the USB switching module, the power module is turned on to enter the preset normal power supply mode; otherwise, the power module is turned off to enter the preset low power consumption mode.

6. The EDID simulation method according to claim 1, characterized in that, It also includes the following steps: During the process of switching from the first channel to the second channel, the connection of the second channel is checked to see if it is normal. If the link is not properly connected, the IRQ_HPD request signal will be regenerated at the DP in HPD signal terminal corresponding to the second channel.

7. The EDID simulation method according to claim 6, characterized in that, It also includes the following steps: When the number of times the IRQ_HPD request signal is regenerated reaches a preset threshold, a channel switching error warning is triggered and the system switches back to the first channel.

8. The method for EDID simulation using level signals according to claim 1, characterized in that, The DP signal switching module receives at least two DP signals input from the host, and the control module controls the DP signal switching module to select the corresponding DP signal from the at least two DP signals input from the host and output it to the display device.

9. A DP switch, characterized in that, include: The system comprises a control module, a DP signal switching module, a USB signal switching module, and a power supply module. The DP signal switching module and the USB signal switching module are both connected to the control module. The control module is used to implement the method for EDID simulation via level signals as described in any one of claims 1-8. The DP signal switching module receives at least two DP signals input from the host, performs signal preprocessing, signal equalization, and signal amplification, and then outputs the signal to the display device. The USB signal switching module switches the channels of at least two USB signals input from the host. The power supply module is connected to the control module, the DP signal switching module, and the USB signal switching module respectively for power supply.

10. The switcher according to claim 9, characterized in that, It also includes a USB power supply module, a USB hub module, and multiple USB ports. The multiple USB ports are all powered by the USB power supply module, and the multiple USB ports are all connected to the output terminal of the USB hub module to connect multiple external devices.

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