Docking station with multi-mode video output switching function and control method thereof

Abstract

The present application relates to computer peripheral device technical field, solved the prior art difficult to close DisplayLink type USB protocol video output at the same time, keep DP Alt Mode video output and non-video function interface normal work problem, provide a kind of with multi-mode video output switching function docking station, including shell and the circuit board being set in shell, circuit board is provided with uplink interface, first video processing unit, second video processing unit, electronic switch element and control unit, shell outer surface is provided with the mode switching operating part of electric connection with control unit;First video processing unit is configured to drive at least one display output by the video signal transmission of USB protocol;Second video processing unit is configured to drive at least one display output by the video signal transmission of DP Alt Mode signal path.The present application is selectively closed by the selection of USB protocol video processing unit, avoids the influence of DP Alt Mode video output and other docking station functions when closing USB protocol video output.

Description

Technical Field

[0001] This invention relates to the field of computer peripherals, and more particularly to a docking station with multi-mode video output switching function and its control method. Background Technology

[0002] With the widespread adoption of USB-C interfaces in laptops, tablets, and desktop computers, docking stations have become essential peripherals for users to expand display output, data transfer, network connectivity, card reading, audio, and charging capabilities. To meet the needs of multi-screen displays and different usage scenarios, some docking stations are equipped with multiple video output capabilities, including one based on the USB protocol and another based on the USB-C interface's DP Alt Mode signal path.

[0003] Typical industry implementations of USB-based video output include publicly available technologies such as DisplayLink-like graphics protocols and Synaptics SuperSpeed ​​Graphics protocols. Their working principle is generally as follows: a dedicated driver runs on the host machine to capture screen images via software. The captured image data is then compressed, encoded, subjected to frame interpolation, or streamed before being transmitted to the docking station via the USB uplink data path. The docking station's corresponding USB graphics protocol video controller decodes, converts, and drives the display output. This method requires the host processor to continuously participate in image capture, compression encoding, and data scheduling, consuming corresponding USB uplink bandwidth and power resources of the docking station's internal video processing unit. Furthermore, when playing video content restricted by content protection mechanisms such as HDCP, USB-based video output, due to its reliance on host-side software capture, compression encoding, and USB graphics protocol transmission, struggles to maintain a native content protection authentication link between the host, the protected content playback program, and the external display device. This can easily lead to problems such as copyrighted streaming media content failing to play properly on external display devices, black screens, prompts indicating unsupported external displays, or only being allowed to play on the host's built-in screen. The video output method based on the DP Alt Mode signal path primarily utilizes the high-speed differential signal lines in the USB-C interface to multiplex DisplayPort video signals. The host side directly generates the DP video signal and transmits it to the docking station via the DP Alt Mode signal path. The docking station typically only performs format conversion, interface adaptation, or signal conversion on this video signal before outputting it to the external display device. It does not require continuous software capture and encoding of the screen image on the host side via the USB graphics protocol. Because the DP Alt Mode signal path is a physical transmission path for the host's native DisplayPort video signal, it is more conducive to maintaining the HDCP content protection authentication process between the host and the external display device, allowing content-protected video signals to be output normally through the external display device. Therefore, the two methods differ significantly in video signal source, host-side processing method, transmission protocol, bandwidth usage, dependence on the docking station's internal video processing unit, and compatibility with content-protected video content.

[0004] In practical use, users may need to use the different video output paths mentioned above simultaneously in scenarios such as office work and multi-screen expansion. However, in scenarios where only DP Alt Mode native video output is required, if the USB-based video processing unit continues to operate, it will still occupy the corresponding power supply resources and USB uplink data path resources. Existing docking stations typically lack a selective on / off control mechanism for different video processing units. Users cannot easily stop the video output of the USB-based video processing unit while continuing to use DP Alt Mode video output and the docking station's non-video function interfaces without unplugging or plugging in devices or performing complex system settings.

[0005] In current usage, if a user wants to stop the aforementioned USB protocol video output, they typically need to operate on the host operating system side. This includes disabling the corresponding virtual display adapter through Device Manager, turning off the corresponding monitor through display settings, adjusting the display device status through the graphics card control panel, or switching between display modes such as duplicate, extended, and main screen only using system shortcuts. All of these methods rely on software intervention from the host operating system. Essentially, the host adjusts the display configuration, virtual display device, or driver's operating status, rather than the docking station disconnecting the power supply path or USB uplink data path of the USB protocol video processing unit at the hardware level. Even if the host stops display output, the USB protocol video processing unit in the docking station may still remain powered on, enumerated, or in standby mode. It's difficult to release the corresponding USB path resources and reduce the power consumption of the video processing unit at the docking station hardware level. It's also difficult to quickly establish a working state that only retains the DP Alt Mode native video output path when the user switches to a content-protected video playback scenario.

[0006] Existing technologies already include solutions for switching display modes. For example, CN221040010U discloses a display mode switching device and an expansion dock with the same. The device obtains instructions for switching the display mode of an external display device through an input unit, stores multiple sets of program codes corresponding to the display modes in a storage unit, and executes the corresponding program codes to switch the display mode of the external display device. The display modes include single-stream transmission mode and multi-stream transmission mode. This solution primarily addresses the complexity of manually setting display modes on a computer, as users often need to do so. It switches the display modes of external display devices, mainly through changes in display mode parameters or output configurations, rather than selectively controlling the power supply paths of different video processing units within the docking station or the USB uplink data path. Furthermore, it fails to address the heterogeneous video output architecture where USB protocol video processing units and DP Alt Mode video processing units coexist, neglecting to propose a hardware control mechanism that allows DP Alt Mode video output and non-video function interfaces to continue operating while the USB protocol video processing unit is disabled. It also fails to consider the differences in HDCP content protection compatibility between DisplayLink-type USB protocol video output paths and native DP Alt Mode video output paths, and does not propose reducing the impact of USB protocol video output paths on protected video playback through docking station-side mode switching.

[0007] Therefore, a pressing technical problem needs to be solved: how to enable the docking station to respond to user mode switching operations in a docking station that combines DisplayLink-type USB protocol video output and DP Alt Mode video output, selectively disconnecting the power supply path and / or USB uplink data path of the USB protocol video processing unit to stop video output, while maintaining the normal operation of DP Alt Mode video output and non-video function interfaces. Summary of the Invention

[0008] In view of this, embodiments of the present invention provide a docking station with multi-mode video output switching function and its control method, in order to solve the problem that the prior art is unable to maintain the normal operation of DP AltMode video output and non-video function interfaces while disabling DisplayLink-type USB protocol video output.

[0009] In a first aspect, embodiments of the present invention provide an expansion dock with multi-mode video output switching function, including a housing and a circuit board disposed within the housing. The circuit board is provided with an uplink interface, a first video processing unit, a second video processing unit, an electronic switching element, and a control unit. The outer surface of the housing is provided with a mode switching operation component electrically connected to the control unit. The first video processing unit is configured to drive at least one display output via video signals transmitted via the USB protocol; The second video processing unit is configured to drive at least one display output via a video signal transmitted through the DP Alt Mode signal path; The first video processing unit and the second video processing unit receive host signals from the same uplink interface; The electronic switch element is disposed on the power supply path and / or USB uplink data path of the first video processing unit, and is turned on or off by the control unit. The control unit is configured to switch between multiple mode states, including at least a first mode state and a second mode state, in response to the interactive operation of the mode switching mechanism. In the first mode state, both the first video processing unit and the second video processing unit are in working state; In the second mode, the control unit disconnects the power supply path and / or USB uplink data path of the first video processing unit through the electronic switch element, causing the first video processing unit to stop video output, while keeping the non-video function interfaces of the second video processing unit and the docking station in working state.

[0010] In an optional embodiment, the first video processing unit is recognized as a virtual display device by the host during operation and provides first EDID information to the host; the second video processing unit transmits second EDID information provided by the external display device to the host through the DDC channel. In the first mode state, the host is used to identify two independent display devices corresponding to the first EDID information and the second EDID information; In the second mode state, the USB endpoint corresponding to the first video processing unit is in a deregistered or unenumerable state on the host side, the first EDID information is removed from the display device list of the host, the host maintains identification of the display device corresponding to the second EDID information, and the DP Alt Mode signal path, DDC channel and HPD signal line corresponding to the second video processing unit remain on.

[0011] In an optional embodiment, the mode switching operation is a single press-type operation or a multi-position rotary selector switch disposed on the outer surface of the housing. When the mode switching operation is the single press operation, the control unit is configured to switch between the first mode state and the second mode state in response to a short press operation of the single press operation; the control unit is also configured to switch the current mode state to the third mode state in response to a long press operation or a double press operation of the single press operation. When the mode switching operation element is the multi-position rotary selector switch, the multi-position rotary selector switch has at least three physical positioning positions, which correspond to the first mode state, the second mode state, and the third mode state, respectively.

[0012] In an optional embodiment, in the third mode state, the control unit disconnects the power supply path and / or data path of the first video processing unit and the second video processing unit, causing the docking station to turn off the display output; The third mode state includes at least one of a charging standby state and a power-off state; in the charging standby state, the control unit disconnects the data path of the non-video function interface while keeping the power transmission path of the docking station connected; in the power-off state, the control unit disconnects the data path of the non-video function interface and the power transmission path of the docking station.

[0013] In an optional embodiment, in the second mode state, the control unit controls the electronic switching element to disconnect the USB uplink data path of the first video processing unit while keeping the power supply path of the first video processing unit on; or, the control unit controls the electronic switching element to disconnect the power supply path of the first video processing unit; the electronic switching element includes at least one of a MOSFET switch, a load switch IC, a USB differential signal switch, and an analog switch; the control unit includes a microcontroller MCU.

[0014] In an optional embodiment, the docking station further includes a status indication unit; The status indication unit is connected to the control unit and is configured to present a corresponding indication status according to the current mode status of the docking station; The status indicator unit includes an RGB light-emitting element and a light guide structure disposed on the housing. The control unit is used to control the RGB light-emitting element to present different light-emitting colors, flashing frequencies, or on / off states. The light guide structure is used to guide the light emitted by the RGB light-emitting element to the outer surface of the housing.

[0015] In an alternative embodiment, the docking station further includes non-volatile memory; The non-volatile memory is connected to the control unit and is used to store the current mode state of the docking station before power failure or after the last switch was completed. The control unit is also configured to read the mode state stored in the non-volatile memory when the dock is powered on again or reconnected to the host, and restore the working mode of the dock according to the read mode state.

[0016] In an optional embodiment, the docking station further includes an EDID memory; The EDID memory is connected to the control unit and is used to pre-read, cache, or store the EDID information of the external display device; In the charging standby state of the third mode, when the dock stops outputting display images to the external display device and needs to maintain the host-side display device enumeration state, the control unit is configured to execute the first display recognition holding mode or the second display recognition holding mode. When the first display recognition retention mode is executed, the control unit disconnects the display data channel in the corresponding display output path and keeps the DDC channel and HPD signal line physically connected, so that the host can still recognize the external display device when the display data stops transmitting; When the second display identification retention mode is executed, the control unit reads and caches the EDID information of the external display device in advance. After the display data channel in the corresponding display output path is disconnected, the control unit or the EDID memory provides a response to the host based on the cached EDID information and keeps the HPD signal in a valid state to simulate the connection state of the external display device.

[0017] In an optional embodiment, the docking station further includes a DC power input interface, a power management circuit, and a PD protocol control unit; The DC power input interface is used to receive DC power supplied by an external DC power adapter; The power management circuit supplies power to the first video processing unit, the second video processing unit, the control unit, and the non-video function interface, respectively. The PD protocol control unit is connected to the uplink interface and is used to provide reverse power to the host via the VBUS pin of the uplink interface in accordance with the USB PD protocol specification.

[0018] In a second aspect, embodiments of the present invention provide a control method for a docking station with multi-mode video output switching function, used to control the docking station with multi-mode video output switching function as described in the first aspect, the method comprising: The control unit detects the interactive operation of the mode switching operation and determines the target mode state based on the interactive operation. The target mode state includes a first mode state, a second mode state, and a third mode state. When the target mode state is the first mode state, the control unit controls both the first video processing unit and the second video processing unit to be in working state; When the target mode state is the second mode state, the control unit disconnects the power supply path and / or USB uplink data path of the first video processing unit through the electronic switch element, so that the first video processing unit stops video output, and keeps the non-video function interface of the second video processing unit and the docking station in the working state. When the target mode state is the third mode state, the control unit disconnects the power supply path and / or data path of the first video processing unit and the second video processing unit, causing the docking station to turn off the display output.

[0019] In an optional embodiment, the step of detecting the interaction operation of the mode switching mechanism through the control unit and determining the target mode state based on the interaction operation includes: Based on the continuous trigger duration and preset time window of the mode switching operation, short press operation, long press operation and double-click operation are identified; When the current mode state is the first mode state or the second mode state, and a short press operation of the mode switching operation element is detected, the mode switches between the first mode state and the second mode state. When a long press or double-click operation of the mode switching operation is detected, the target mode state is determined to be the third mode state. When the current mode state is the third mode state, and a short press operation of the mode switching operation is detected, the target mode state is determined to be the first mode state. The short press operation, the long press operation, and the double-click operation are distinguished according to a first time threshold, a second time threshold, and a third time threshold. The first time threshold is used to determine the duration of a single press, the second time threshold is used to determine the time interval between two adjacent presses, and the third time threshold is used to determine whether the continuous press meets the long press condition.

[0020] In an optional embodiment, when the target mode state is the second mode state, the control unit controls the electronic switching element to disconnect the USB uplink data path of the first video processing unit and keep the power supply path of the first video processing unit on, so that the first video processing unit stops video output and retains the power-on standby state. Alternatively, the control unit controls the electronic switching element to disconnect the power supply path of the first video processing unit, so that the first video processing unit is powered off and stops working; Wherein, after the first video processing unit stops video output, the control unit keeps the DP Alt Mode signal path, DDC channel and HPD signal line of the second video processing unit in a conducting state, so that the first EDID information corresponding to the first video processing unit on the host side is no longer retained as available display device information, and continues to identify the external display device corresponding to the second EDID information transmitted by the second video processing unit through the DDC channel.

[0021] In an optional embodiment, when the target mode state is the third mode state, the control unit disconnects the display output path and the data path of the non-video function interface of the expansion dock, while keeping the power transmission path connected; or, the control unit disconnects the display output path, the data path of the non-video function interface, and the power transmission path of the expansion dock.

[0022] In summary, the beneficial effects of the present invention are as follows: The expansion dock and its control method with multi-mode video output switching function provided in this embodiment of the invention distinguish the DisplayLink USB protocol video output path and the DP Alt Mode video output path into two independently manageable heterogeneous video output paths by simultaneously setting a first video processing unit and a second video processing unit in the same expansion dock. The first video processing unit is used to process video signals transmitted via the USB protocol, and the second video processing unit is used to process video signals transmitted via the DP Alt Mode signal path. Although both receive host signals from the same uplink interface, their subsequent power supply, data transmission and display output paths are independent of each other. Based on this, electronic switching elements are installed on the power supply path and / or USB uplink data path of the first video processing unit, and are controlled by the control unit to turn on or off according to the interactive operation of the mode switching mechanism. When in the first mode, both types of video processing units remain operational, and the docking station can meet the needs of multi-screen display or full-function use. When switching to the second mode, the control unit does not turn off the display or adjust the display mode through the host operating system, but directly disconnects the power supply path and / or USB uplink data path of the first video processing unit through the electronic switching elements, preventing the first video processing unit from continuing to receive or process USB protocol video signals, and stopping DisplayLink type USB protocol video output at the hardware level. At the same time, since the electronic switching elements are only installed on the power supply path and / or USB uplink data path corresponding to the first video processing unit, and do not cut off the DP Alt Mode signal path corresponding to the second video processing unit, nor cut off the non-video function interfaces of the docking station, the second video processing unit can still continue to drive DP Alt Mode video output, and non-video function interfaces such as USB data, network, card reading, and audio can also remain operational. Therefore, this invention enables the selective shutdown of the USB protocol video processing unit, avoiding the impact on DP Alt Mode video output and other docking station functions when the USB protocol video output is turned off. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of the present invention.

[0024] Figure 1 This is a schematic diagram of the expansion dock in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the interface arrangement of the expansion dock in Embodiment 1 of the present invention; Figure 3This is a schematic diagram of the mode switching operation component in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the topology of the expansion dock functional module in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the light guide structure of the status indicator unit in Embodiment 1 of the present invention; Figure 6 This is a comparison table of the on / off states of each mode in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the assembly structure of the status indicator unit of the expansion dock in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the overall flow of the control method for the expansion dock with multi-mode video output switching function in Embodiment 2 of the present invention; The numbers in the diagram are as follows: 1-Housing; 2-Circuit board; 21-Uplink interface; 22-Electronic switch element; 23-Mode switching operation element; 24111-First HDMI interface of the first display output interface group; 24112-First DP interface of the first display output interface group; 24121-Second HDMI interface of the first display output interface group; 24122-Second DP interface of the first display output interface group; 2421-HDMI interface of the second display output interface group; 2422-DP interface of the second display output interface group; 25-USB-C interface; 26-Network interface; 27-DC power input interface; 28-USB data interface; 29-Status indicator unit; 291-RGB light-emitting element; 292-Light guide structure. Detailed Implementation

[0025] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the invention.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0027] It should be noted that all actions involving the acquisition of signals, information, or data in this invention are carried out in compliance with the relevant data protection laws and regulations of the locality and with authorization from the owner of the relevant device. Example 1

[0028] Please see Figure 1 , Figure 2 and Figure 3 This invention provides a docking station with multi-mode video output switching function, including a housing 1 and a circuit board 2 disposed in the housing 1. The circuit board is provided with an uplink interface 21, a first video processing unit, a second video processing unit, an electronic switch element 22 and a control unit. The outer surface of the housing 1 is provided with a mode switching operation element 23 electrically connected to the control unit. The first video processing unit is configured to drive at least one display output via video signals transmitted via the USB protocol; The second video processing unit is configured to drive at least one display output via a video signal transmitted through the DP Alt Mode signal path; The first video processing unit and the second video processing unit receive host signals from the same uplink interface 21; The electronic switch element is disposed on the power supply path and / or USB uplink data path of the first video processing unit, and is turned on or off by the control unit. The control unit is configured to switch between multiple mode states, including at least a first mode state and a second mode state, in response to the interactive operation of the mode switching operation 23. In the first mode state, both the first video processing unit and the second video processing unit are in working state; In the second mode, the control unit disconnects the power supply path and / or USB uplink data path of the first video processing unit through the electronic switch element, causing the first video processing unit to stop video output, while keeping the non-video function interfaces of the second video processing unit and the docking station in working state.

[0029] Specifically, the first video processing unit can be implemented using a USB graphics protocol video controller commonly used in the industry, such as the DisplayLink family (including but not limited to DL-3xxx, DL-5xxx, DL-6xxx series), Synaptics SuperSpeedGraphics series chips, or other video controllers based on the USB graphics protocol. The second video processing unit can be implemented using a DP-to-HDMI conversion chip commonly used in the industry or a similar DP Alt Mode signal format conversion IC, such as VMM5200, VMM2322, etc. The docking station uses the housing 1 and circuit board as the basic supporting structure, and centrally mounts the uplink interface 21, the first video processing unit, the second video processing unit, electronic switching components, and control unit on the circuit board. The mode switching operation component 23 is arranged on the outer surface of the housing 1, which allows users to switch modes directly without disassembling the device or entering the host system settings. Uplink interface 21 is used to connect to the host. The first video processing unit corresponds to the video output path implemented via the USB protocol. Typically, video-related data is transmitted from the host side via the USB data channel, and then the display output is driven by the docking station. The second video processing unit corresponds to the DP Alt Mode video output path. It receives video signals from the host side through the DP Alt Mode channel in the USB-C interface and drives the display output. The first and second video processing units receive host signals from the same uplink interface 21, so that the docking station does not switch between multiple hosts or multiple input sources, but manages the two types of internal video processing paths under the same host connection condition.

[0030] Electronic switching element 22 is disposed on the power supply path and / or USB uplink data path of the first video processing unit. Its function is to directly change the conduction state of the corresponding hardware path of the first video processing unit under the output control of the control unit. After receiving the interactive operation of the mode switching operation element 23, the control unit switches the working state of the expansion dock according to the mode instruction corresponding to the current operation. In the first mode state, both the first video processing unit and the second video processing unit continue to work, which is suitable for office, multi-screen expansion or scenarios that require full display output capability. In the second mode state, the control unit controls the electronic switching element to disconnect the power supply path and / or USB uplink data path of the first video processing unit, so that the first video processing unit stops video output, while the second video processing unit continues to output through the DP Alt Mode native path, and keeps the non-video function interfaces such as USB data, RJ45 network port, audio, and card reader working normally.

[0031] Please see Figure 2 The diagram illustrates the structural layout of the docking station's interface side. A circuit board 2 is housed within the casing 1, with interfaces distributed along the length of the circuit board 2. A USB data interface 28 is located at the top for connecting USB peripherals; the upper middle section houses the first display output interface group, where the first DP interface 24112 and the first HDMI interface 24111 of the first display output interface group are arranged opposite each other, forming one first display output channel. The second DP interface 24122 and the second HDMI interface 24121 of the first display output interface group are arranged opposite each other, forming another first display output channel for connecting external display devices; a second display output interface group is located slightly below the middle. The DP interface 2422 of the second display output interface group is arranged opposite to the HDMI interface 2421 of the second display output interface group, and is used to output video signals from another display channel. Further down are an uplink interface 21 and a USB-C interface 25. The uplink interface 21 is used to connect to the host and receive signals from the host side, and the USB-C interface 25 can be used as a downlink USB-C interface for the docking station. At the bottom area are a DC power input interface 27 and a network interface 26. The DC power input interface 27 is used to connect to an external DC power supply, and the network interface 26 is used to connect a network cable for wired network communication. This figure illustrates the relative positions of the display output interfaces, host connection interfaces, power input interfaces, and non-video expansion interfaces on the docking station interface side on the housing 1 and circuit board 2.

[0032] By integrating mode switching, video processing unit on / off, and interface functions, users can easily switch between full-function and performance-priority states using the mode switching mechanism 23 on housing 1. In the second mode, the first video processing unit is disconnected and no longer participates in USB protocol video output, reducing the impact of this path on USB uplink data resources and the internal power consumption of the docking station. The second video processing unit remains operational, and external display devices can still output images via the DP Alt Mode path. Non-video function interfaces are not disabled along with the first video processing unit, allowing users to continue using docking station functions such as data transfer, networking, audio, or card reading.

[0033] In an optional embodiment, the first video processing unit is recognized as a virtual display device by the host during operation and provides first EDID information to the host; the second video processing unit transmits second EDID information provided by the external display device to the host through the DDC channel. In the first mode state, the host is used to identify two independent display devices corresponding to the first EDID information and the second EDID information; In the second mode state, the USB endpoint corresponding to the first video processing unit is in a deregistered or unenumerable state on the host side, the first EDID information is removed from the display device list of the host, the host maintains identification of the display device corresponding to the second EDID information, and the DP Alt Mode signal path, DDC channel and HPD signal line corresponding to the second video processing unit remain on.

[0034] Specifically, EDID information is display capability data provided by the display device to the host, including the resolution, refresh rate, color format supported by the display device, and device identification information. The host can use this information to identify the display device and configure display parameters. The DDC channel is the communication channel through which the host reads the EDID information of the external display device, and the HPD signal line is used to provide feedback to the host on the hot-plug status of the external display device. The first video processing unit implements video output through the USB protocol. When it is working, the corresponding driver on the host side usually works with the first video processing unit to form a virtual display device, rather than simply transmitting the physical identity of the external monitor and providing the first EDID information to the host. When the second video processing unit works through the DP Alt Mode path, it transmits the second EDID information provided by the external display device itself to the host through the DDC channel and maintains the connection status feedback of the external display device through the HPD signal line, so that the host can configure the display output according to the capabilities of the actual external display device. The first EDID information corresponds to the virtual display device formed by the USB protocol video processing unit, and the second EDID information corresponds to the external display device downstream of the DP Alt Mode path. The two have different sources and different display device identities, which can more clearly reflect that there are two independent video output paths inside the docking station.

[0035] In the first mode, both the first and second video processing units are operational. The host can simultaneously identify the two independent display devices corresponding to the first and second EDID information. At this time, both the USB protocol video output path and the DP Alt Mode video output path are enumerated and participate in display output, suitable for full-function or multi-screen expansion scenarios. After switching to the second mode, the control unit disconnects the power supply path or USB uplink data path of the first video processing unit via an electronic switch, causing the first video processing unit to lose power or preventing it from continuing USB protocol video data transmission and endpoint enumeration with the host. This causes the USB endpoint corresponding to the first video processing unit to be deregistered or unenumerable on the host side, and the host system no longer retains the first EDID information as available display device information in the display device list. Simultaneously, the DP Alt Mode signal path of the second video processing unit is not disconnected, and the DDC channel and HPD signal line remain conductive. The second EDID information of the downstream external display device can still be read by the host through the DDC channel, and the connection status of the external display device can also be sensed by the host through the HPD signal line. Therefore, the host continues to identify the display device corresponding to the second EDID information. This process does not simply change the mirror or extended display parameters of the monitor, nor is it achieved solely by the host operating system actively disabling the virtual monitor or uninstalling the driver. Instead, it selectively disconnects the hardware path of the first video processing unit on the docking station side, causing the display device identity corresponding to the USB protocol video path to be visiblely removed on the host side, while retaining the DP Alt Mode display device identity.

[0036] Through the above settings, the hardware on / off result of the first video processing unit can be reflected in the change of the host-side display device list, making the state of the first video processing unit stopping video output in the second mode a clear system manifestation. The cancellation or unenumerability of the USB endpoint on the host side, the disappearance of the virtual display device, and the removal of the first EDID information indicate that the USB-based video output path has been removed from the system display link, reducing the resource consumption caused by continuing to maintain USB protocol video output, virtual display enumeration, and related driver communication. If the second EDID information is still recognized and the DPAlt Mode signal path, DDC channel, and HPD signal line remain conductive, it indicates that the DP Alt Mode native video path and external display device recognition are not affected by the disconnection of the first video processing unit, and the user can still continue to use the display output. Therefore, while disabling USB protocol video output, the docking station can still maintain the continuity of device recognition and use of the DP Alt Mode display output.

[0037] In an optional embodiment, the mode switching operation element 23 is a single press-type operation element or a multi-position rotary selector switch disposed on the outer surface of the housing 1. When the mode switching operation 23 is the single press operation, the control unit is configured to switch between the first mode state and the second mode state in response to a short press operation of the single press operation; the control unit is also configured to switch the current mode state to the third mode state in response to a long press operation or a double press operation of the single press operation. When the mode switching operation element 23 is the multi-position rotary selector switch, the multi-position rotary selector switch has at least three physical positioning positions, which correspond to the first mode state, the second mode state, and the third mode state, respectively.

[0038] Specifically, the mode switching actuator 23 is disposed on the outer surface of the housing 1 and is used to convert the user's external operations into mode switching signals that the control unit can recognize. It can be a single-press actuator or a multi-position rotary selector switch. When using a single-press actuator, the user only needs to use one physical button to switch between multiple modes, eliminating the need for multiple function keys on the housing 1. This press actuator can be a button structure with a press travel and tactile feedback, for example, a press travel of 1.5mm to 2mm and a press force of 150gf to 200gf. After the button is electrically connected to the control unit, the control unit collects the button's press signal, release signal, continuous press time, and the time interval between two adjacent presses. A short press corresponds to a press duration that does not reach the long press threshold and does not result in a double press within a set time window, suitable for frequent switching between the first and second mode states. A long press corresponds to a continuous press time that reaches a preset threshold, and a double press corresponds to two consecutive valid presses detected within a preset time window; both can be used as triggers to enter the third mode state. With this setup, a short press handles the high-frequency switching between full-function mode and performance-priority mode, while a long press or double press quickly enters the relevant states such as turning off the display output, charging standby, or powering off. This keeps the interface of the casing 1 simple and avoids users having to make complex settings through the host system menu.

[0039] After receiving a press event from a single press-type actuation device, the control unit can determine the operation based on the press duration and the interval between adjacent presses. A timer starts when the button is pressed. If the continuous press time reaches a long press threshold, it is recognized as a long press operation, and the current mode is switched to the third mode. If the button is released before reaching the long press threshold, it continues to wait within a preset time window for a second valid press. If a second valid press is detected, it is recognized as a double press operation, and the system switches to the third mode. If no second valid press is detected, it is confirmed as a short press operation, and the system switches between the first and second modes. This determination method reduces misjudgments between short presses, long presses, and double presses, allowing the same button to output different mode switching commands under different interaction methods. During a short press, the control unit switches between the first and second modes. In the first mode, both the first and second video processing units are active, suitable for full-function or multi-screen usage scenarios. In the second mode, the first video processing unit stops video output, while the second video processing unit and non-video function interfaces remain active, suitable for scenarios that only retain DP Alt Mode video output and continue using peripheral interfaces. When pressed and held or double-clicked, the control unit switches the current mode to the third mode, which is used to turn off the display output and further enter the charging standby state or the power-off state, thus completing the scene switching without unplugging or plugging in the docking station or entering the host system settings.

[0040] When using a multi-position rotary selector switch, the rotary selector switch has at least three physical positioning positions, corresponding to the first, second, and third mode states, respectively. Each physical positioning position can be connected to the control unit through different contact combinations, resistor voltage division values, or coded signals. The control unit reads the corresponding position signal and directly determines the current target mode state. For example, when rotated to the first position, the control unit controls both the first and second video processing units to be in working state; when rotated to the second position, the control unit disconnects the power supply path and / or USB uplink data path of the first video processing unit through an electronic switching element, while maintaining the operation of the second video processing unit and non-video function interfaces; when rotated to the third position, the control unit disconnects the power supply path and / or data path of the first and second video processing units, causing the docking station to turn off its display output. Compared with push-button operation, the multi-position rotary selector switch can intuitively present the current mode state through the physical position, making it easier for users to confirm the working mode of the docking station without observing the host system interface, and also helps to reduce false triggering caused by button timing recognition.

[0041] In an optional embodiment, in the third mode state, the control unit disconnects the power supply path and / or data path of the first video processing unit and the second video processing unit, causing the docking station to turn off the display output; The third mode state includes at least one of a charging standby state and a power-off state; in the charging standby state, the control unit disconnects the data path of the non-video function interface while keeping the power transmission path of the docking station connected; in the power-off state, the control unit disconnects the data path of the non-video function interface and the power transmission path of the docking station.

[0042] Specifically, in the third mode, the operating priority of the first and second video processing units is no longer distinguished. Instead, the control unit simultaneously disconnects the power supply and / or data paths of both types of video processing units, stopping all display outputs. The power supply path mainly refers to the power path supplying the first and second video processing units, while the data path includes the USB uplink data path or DP Alt Mode related signal path for video signal transmission. The control unit can control the shutdown of these paths through electronic switching elements, load switches, power management circuits, or signal switches. In this way, when the user leaves the workstation, leaves the machine on overnight, or when external display output is temporarily not needed, the docking station can quickly switch from the aforementioned first or second mode to a state where display output is turned off, avoiding unnecessary power consumption and heat generated by the continued operation of the two types of video processing units.

[0043] The third mode includes at least one of charging standby and power-off states, adaptable to different usage needs. In charging standby mode, the control unit disconnects the data transmission paths of non-video function interfaces, such as USB data, RJ45 network ports, audio, and card reader interfaces, while maintaining the power transmission path of the docking station, allowing the host to still receive charging via the USB PD power transmission path. This mode is suitable for scenarios where users no longer need display output and data expansion functions but still want the docking station to continue providing power.

[0044] In the power-off state, the control unit not only disconnects the relevant paths of the first and second video processing units, but also disconnects the data path of non-video function interfaces and the power transmission path of the docking station. This stops the docking station's display output, data expansion, and power supply functions, leaving only the control unit itself in an extremely low-power standby state to listen for subsequent wake-up operations. This method is suitable for scenarios where users no longer need to use the docking station and want to minimize standby power consumption. By setting the charging standby state and the power-off state in parallel in the third mode, the docking station can meet both the light standby needs of retaining only the charging function and the deep power-off needs of completely shutting down functional paths. This makes mode switching no longer limited to video output switching, but covers comprehensive management of display, data, and power supply paths, thereby improving the product's adaptability in office, entertainment, away from the workstation, and nighttime standby scenarios.

[0045] In an optional embodiment, in the second mode state, the control unit controls the electronic switching element to disconnect the USB uplink data path of the first video processing unit while keeping the power supply path of the first video processing unit on; or, the control unit controls the electronic switching element to disconnect the power supply path of the first video processing unit; the electronic switching element includes at least one of a MOSFET switch, a load switch IC, a USB differential signal switch, and an analog switch; the control unit includes a microcontroller MCU.

[0046] Specifically, in the second mode, the disconnection method of the first video processing unit includes two on / off paths, and the control unit can determine which one to use based on product settings, chip platform characteristics, or user selection. The first method is to disconnect the USB uplink data path of the first video processing unit while keeping its power supply path on. The USB uplink data path is the path between the first video processing unit and the host used to transmit USB protocol video data, maintain USB enumeration, and endpoint communication. In DisplayLink-type USB protocol video output scenarios, this path carries video data captured and compressed by the host through software. The control unit can be implemented by a microcontroller (MCU). The MCU outputs a switch control level according to the control command corresponding to the second mode state, causing the USB differential signal switch or analog switch set on the USB uplink data path to enter the off state, thereby blocking the USB protocol video data transmission between the first video processing unit and the host. Since the power supply path of the first video processing unit remains open, the chip itself can be in a power-on standby state. When the user switches back to the first mode, the control unit can restore the USB uplink data path to resume communication and video output. Compared with the complete power-off method, this reduces the time required for power-on, initialization, and enumeration, making it suitable for products that prioritize mode switching response speed.

[0047] The second method involves controlling an electronic switching element to disconnect the power supply path to the first video processing unit, causing it to power down and cease operation. The power supply path is the path that provides the operating voltage to the first video processing unit. The electronic switching element can be a MOSFET switch or a load switch IC, positioned before the power input of the first video processing unit. The MCU of the control unit controls this electronic switching element to disconnect the power supply path via an enable signal, gate control signal, or power management control signal. After the power supply path is disconnected, the first video processing unit no longer maintains USB protocol video output, USB enumeration communication, and chip standby power consumption, further reducing the docking station's internal power consumption and heat generation. This method is suitable for products that prioritize low power consumption, temperature rise control, or long-term operation in the second mode. While switching back to the first mode typically requires a power-on re-energization, initialization, and completion of host-side enumeration, resulting in a longer recovery time compared to simply disconnecting the USB uplink data path, the energy-saving effect is more significant.

[0048] By juxtaposing the disconnection of the USB uplink data path and the disconnection of the power supply path, the docking station can select between fast recovery and low power consumption. USB differential signal switches and analog switches are more suitable for placement on the USB uplink data path to cut off USB protocol video data transmission; MOSFET switches and load switch ICs are more suitable for placement on the power supply path of the first video processing unit to control chip power-on or power-off; the use of a microcontroller (MCU) in the control unit facilitates the output of different switch control signals based on the interaction results of the mode switching operation element 23. This structure ensures that the first video processing unit's video output stop in the second mode does not depend on software disabling by the host operating system, but is achieved by changes in the conduction state of the docking station's internal hardware paths. This avoids affecting the continuous operation of the second video processing unit and non-video function interfaces while disabling DisplayLink-type USB protocol video output.

[0049] In an alternative embodiment, please refer to Figure 4 The expansion dock also includes a status indication unit 29; The status indication unit 29 is connected to the control unit and is configured to present a corresponding indication status according to the current mode status of the docking station; The status indication unit 29 includes an RGB light-emitting element 291 and a light guide structure 292 disposed on the housing 1. The control unit is used to control the RGB light-emitting element 291 to present different light-emitting colors, flashing frequencies, or on / off states. The light guide structure 292 is used to guide the light emitted by the RGB light-emitting element 291 to the outer surface of the housing 1.

[0050] Specifically, the status indicator unit 29 visually displays the current operating mode of the docking station to the user, allowing the user to determine whether the docking station is in the first, second, or other modes without needing to check the host system settings. The RGB light-emitting element 291 can be a light-emitting device capable of emitting red, green, blue, or mixed colors of light. After completing the mode switch, the control unit outputs corresponding control signals to the RGB light-emitting element 291 according to the current mode state, causing it to display different light colors, flashing frequencies, or on / off states, such as distinguishing different operating states through constant light, slow flashing, fast flashing, or off. The light guide structure 292 is disposed on the housing 1 to guide the light generated by the RGB light-emitting element 291 to an observable position on the outer surface of the housing 1, avoiding direct exposure of the light-emitting element and thus limiting structural layout, while making the indication effect more concentrated, uniform, and easy to identify. With the above settings, the docking station can provide users with intuitive status prompts when switching between different video output modes, reducing accidental operation and repeated switching. It also makes it easier for users to confirm whether the USB protocol video processing unit has stopped outputting and whether the DP Alt Mode video output is still working, thereby improving the ease of use and reliability of interaction of the multi-mode docking station.

[0051] In an alternative embodiment, the docking station further includes non-volatile memory; The non-volatile memory is connected to the control unit and is used to store the current mode state of the docking station before power failure or after the last switch was completed. The control unit is also configured to read the mode state stored in the non-volatile memory when the dock is powered on again or reconnected to the host, and restore the working mode of the dock according to the read mode state.

[0052] Specifically, the non-volatile memory is used to retain mode status information after the docking station is powered off, unplugged from the host, or reconnected to the host. This mode status information can be identification data corresponding to the first, second, or third mode status. After each mode switch, the control unit writes the current operating mode into the non-volatile memory. The non-volatile memory will not lose the stored data even after the external power supply is disconnected. Therefore, when the docking station is powered on again or reconnected to the host, the control unit can first read the saved mode status and then control the first video processing unit, the second video processing unit, electronic switching elements, and non-video function interfaces to restore them to the corresponding operating states according to the mode status. Through this mode memory and power-on recovery method, users do not need to manually repeat the mode selection every time they reconnect the docking station, thus maintaining their previous usage habits. It also avoids the USB protocol video processing unit from re-enumerating, occupying USB uplink bandwidth, or regenerating unnecessary virtual display devices due to default restoration to full-function mode, thereby improving the continuity of docking station use and the stability of mode switching.

[0053] In an optional embodiment, the docking station further includes an EDID memory; The EDID memory is connected to the control unit and is used to pre-read, cache, or store the EDID information of the external display device; In the charging standby state of the third mode, when the dock stops outputting display images to the external display device and needs to maintain the host-side display device enumeration state, the control unit is configured to execute the first display recognition holding mode or the second display recognition holding mode. When the first display recognition retention mode is executed, the control unit disconnects the display data channel in the corresponding display output path and keeps the DDC channel and HPD signal line physically connected, so that the host can still recognize the external display device when the display data stops transmitting; When the second display identification retention mode is executed, the control unit reads and caches the EDID information of the external display device in advance. After the display data channel in the corresponding display output path is disconnected, the control unit or the EDID memory provides a response to the host based on the cached EDID information and keeps the HPD signal in a valid state to simulate the connection state of the external display device.

[0054] Specifically, the EDID memory is used to store the identification information of the external display device. EDID information typically includes parameters such as the resolution, refresh rate, color format, and audio capabilities supported by the display. The host relies on this information to determine whether the external display device exists and what display output configuration should be used. In the charging standby state of the third mode, although the docking station stops outputting display images to the external display device, it can still maintain the display device enumeration state on the host side as needed, preventing the host from mistakenly thinking that the monitor has been unplugged and triggering desktop window rearrangement, application full-screen exit, or display configuration readjustment. The first display identification retention method maintains the physical connection state of the DDC channel and HPD signal line while disconnecting the display data channel, allowing the host to still obtain identification response through the external display device itself. The second display identification retention method is suitable for situations where it is inconvenient to continue direct response from the external display device after the display data channel is disconnected. The control unit first reads and caches the EDID information of the external display device, and then the control unit or EDID memory provides a response to the host based on this EDID information, while keeping the HPD signal valid, thereby simulating that the external display device is still connected. With the above settings, the docking station can maintain the host's continuous recognition of external display devices while turning off the display output and retaining the charging function. This reduces display layout changes and re-recognition waiting after mode switching, and improves the stability and recovery efficiency of use in the third mode.

[0055] In an optional embodiment, the docking station further includes a DC power input interface, a power management circuit, and a PD protocol control unit; The DC power input interface is used to receive DC power supplied by an external DC power adapter; The power management circuit supplies power to the first video processing unit, the second video processing unit, the control unit, and the non-video function interface, respectively. The PD protocol control unit is connected to the uplink interface 21 and is used to provide reverse power to the host via the VBUS pin of the uplink interface 21 in accordance with the USB PD protocol specification.

[0056] Specifically, the docking station receives DC power from an external DC power adapter via the DC power input interface. After voltage conversion by the power management circuit, the power is supplied to the first video processing unit, the second video processing unit, the control unit, and various non-video function interfaces. Simultaneously, the power management circuit inputs a portion of the power into the PD protocol control unit, encapsulates it into a power transfer contract conforming to the USB PD protocol specification, and then supplies reverse power to the host via the VBUS pin of the uplink interface. In the third mode (charging standby state), the control unit keeps the PD power transfer path of the uplink interface open by controlling the PD protocol control unit, allowing the host to continue charging. In the third mode (complete shutdown state), the control unit controls the PD protocol control unit to terminate the PD contract and disconnect the VBUS output, causing the docking station to stop supplying power to the host.

[0057] Please see Figure 5 , Figure 5This is a topology diagram of the docking station's functional modules. The diagram shows the arrangement and signal connections of the various functional modules within the docking station's housing 1 and circuit board 2. Circuit board 2 houses modules such as an uplink interface 21, a first video processing unit, a second video processing unit, electronic switching elements, a control unit, a status indicator unit 29, non-volatile memory, EDID memory, a power management circuit, a PD protocol control unit, and non-video function interfaces. After the host signal enters the docking station via the uplink interface 21, one path is transmitted to the first video processing unit via the USB uplink data path, where the first video processing unit drives the first display output based on the USB protocol video processing method; the other path is transmitted to the second video processing unit via the DP Alt Mode signal path, where the second video processing unit drives the second display output. Electronic switching elements are located on the power supply path and / or the USB uplink data path of the first video processing unit and are controlled by the control unit, thereby stopping the first video processing unit's video output in the second mode state while maintaining the operation of the second video processing unit and the non-video function interfaces. The mode switching operation component 23 is located on the outer surface of the housing 1 and connected to the control unit. The user can trigger the mode switching by short press, long press or double-click and other interactive operations. The control unit controls the electronic switch element, status indicator unit 29, EDID memory and non-volatile memory and other modules according to the current mode status, so that the docking station can stably switch between full function, performance priority, charging standby or power off states.

[0058] Please see Figure 6 , Figure 6 This is a cross-sectional view of the light guide structure of the status indicator unit. The figure shows the cross-sectional mounting structure of the status indicator unit 29 between the housing 1 and the circuit board 2. The RGB light-emitting element 291 is mounted on the circuit board 2, and the light guide structure 292 is positioned between the RGB light-emitting element 291 and the outer surface of the housing 1. A light-emitting surface is provided on the housing 1 corresponding to the light guide structure 292. The light emitted by the RGB light-emitting element 291 propagates outward along the light guide structure 292 and exits from the light-emitting surface. The dashed box in the figure represents the overall structural range of the status indicator unit 29, the dashed light path represents the propagation path of the light emitted by the RGB light-emitting element 291 inside the light guide structure 292, and the upward arrow indicates the direction of light emission. The control unit can control the RGB light-emitting element 291 to display different colors, flashing frequencies, or on / off states according to the current mode state of the docking station. The light guide structure 292 guides the point light source to the outer surface of the housing 1, allowing the user to identify the current mode state through the external indicator effect without viewing the software interface, thereby improving the visual feedback effect and ease of use after the docking station mode switch.

[0059] Please see Figure 7 , Figure 7This table provides a comparison of the on / off states of each mode. It uses channels or functions as rows and mode states as columns, explaining the on / off states of each channel in the first mode state, second mode state, third mode state A, and third mode state B. In the first mode state, the power supply channel and USB uplink data channel of the first video processing unit, the power supply channel of the second video processing unit, the display data channel, the DDC channel, the HPD signal line, the non-video function interface data channel, and the power transmission channel are all connected. The host side can simultaneously identify the display device corresponding to the first EDID information and the second EDID information, indicating a full-function operating state. In the second mode state, at least one of the power supply channel and USB uplink data channel of the first video processing unit is disconnected, causing the first video processing unit to stop video output and remove the first EDID information from the host side. Simultaneously, the DP Alt Mode signal channel, DDC channel, HPD signal line, non-video function interface, and power transmission channel of the second video processing unit remain connected. This is suitable for scenarios prioritizing USB bandwidth, reducing system load, and maintaining basic expansion functions. The third mode, state A, is the charging standby state. The display output and non-video function interface data path are disconnected, but the power transmission path remains connected, and the host can still be charged. The third mode, state B, is the power off state. The display output, non-video function interface data path, and power transmission path are all disconnected, and the status indicator unit 29 is turned off. This forms a clear correspondence between the path control logic in different mode states. Example 2

[0060] Please see Figure 8 This invention provides a control method for a docking station with multi-mode video output switching function, used to control the docking station with multi-mode video output switching function as described in Embodiment 1. The method includes: The control unit detects the interactive operation of the mode switching operation and determines the target mode state based on the interactive operation. The target mode state includes a first mode state, a second mode state, and a third mode state. Specifically, when the control unit detects the interactive operation of the mode switching device, the control unit can typically be implemented by an MCU microcontroller or a control chip with input detection and path control capabilities. Its function is to identify user operations and output corresponding control signals inside the docking station. The mode switching device is a physical interactive component located on the outer surface of the housing, allowing the user to directly trigger mode switching. It can be a single press-type device or a multi-position rotary selector switch. When using a press-type device, the control unit can detect the pressed level, released level, continuous pressing time, and interval between two presses through the input pin, and preset time thresholds such as T1, T2, T3, and T4 in the firmware. A short press can be identified by a pressing time less than the threshold and no second press within the set time window; a double press can be identified by two consecutive valid presses within the set time window; and a long press can be identified by a continuous pressing time reaching the corresponding threshold. If a rotary selector switch is used, the target mode state can be determined by reading the level or encoded signal corresponding to different positions. The target mode state is the result of subsequent path control determined by the control unit based on user operation. It includes a first mode state, a second mode state, and a third mode state, corresponding to scenarios such as full-function use, performance-priority use, and low-power use with display output off, respectively. This step first stably identifies the user's intent and then uniformly converts it into a mode state. This helps avoid misjudgments between short presses, long presses, and double presses, and also provides a clear basis for the control of subsequent video processing units and interface paths.

[0061] When the target mode state is the first mode state, the control unit controls both the first video processing unit and the second video processing unit to be in working state; Specifically, when the target mode is in the first mode state, the control unit controls both the first and second video processing units to be in working state, enabling the docking station to enter full-function mode. The first video processing unit is a processing chip that implements video output via the USB protocol. Its video data communicates with the host via the USB uplink path and is then driven by the docking station to drive the display output. The second video processing unit is a chip that processes video via the DP Alt Mode signal. DP Alt Mode is the working mode of the USB-C interface multiplexing DisplayPort video signals. The host-side video signal is transmitted to the docking station via the DP Alt Mode channel in USB-C and then output to the display interface. In this mode, the control unit keeps the power supply path of the first video processing unit, the USB uplink data path, and the video signal path of the second video processing unit conductive. If necessary, it also controls the corresponding load switch, signal switch, or power management circuit to enter the enabled state, so that both types of video processing units can complete host enumeration, video data transmission, or video signal pass-through, and drive the corresponding display output interface to output the screen. At the same time, non-video function interfaces such as the USB data interface, RJ45 network port, audio interface, SD card slot, and USB PD charging path can also maintain normal operation. This step enables the docking station to meet the full functionality requirements of scenarios such as office work, multi-screen expansion, and multi-peripheral connection, avoiding the impact on users' use of all display output capabilities due to the default shutdown of a certain video path.

[0062] When the target mode state is the second mode state, the control unit disconnects the power supply path and / or USB uplink data path of the first video processing unit through the electronic switch element, so that the first video processing unit stops video output, and keeps the non-video function interface of the second video processing unit and the docking station in the working state. Specifically, when the target mode is the second mode, the control unit disconnects the power supply path and / or USB uplink data path of the first video processing unit via an electronic switching element, causing the first video processing unit to stop video output while maintaining the non-video function interfaces of the second video processing unit and the docking station in an active state. The electronic switching element can be a MOSFET, load switch IC, or USB differential signal switch driven by the control unit's output port. Its location can be within the power supply path of the first video processing unit or within the USB uplink data path between the first video processing unit and the uplink interface. The power supply path provides the operating voltage to the first video processing unit; disconnecting it stops the first video processing unit from power, reducing power consumption and heat generation. The USB uplink data path is the path for USB protocol video data communication between the first video processing unit and the host; disconnecting it prevents the first video processing unit from receiving or maintaining the USB video data connection, thus stopping screen output. However, while maintaining power, it can remain in a power-on standby state, facilitating quick recovery when switching back to the first mode. At this time, the control unit does not shut down the second video processing unit, allowing it to continue driving the display output through the native DPAlt Mode path. Simultaneously, it retains the operational status of non-video function interfaces such as USB data, network, audio, and card reading, preventing the second mode from being misinterpreted as a complete sleep or power-off. The key effect of this step is to selectively disconnect the USB protocol video processing unit. When the user only needs DP Alt Mode video output, the display and peripheral expansion functions can still be used, while reducing the USB protocol video path's consumption of host-side communication resources, docking station internal power consumption, and bandwidth resources.

[0063] When the target mode state is the third mode state, the control unit disconnects the power supply path and / or data path of the first video processing unit and the second video processing unit, causing the docking station to turn off the display output.

[0064] Specifically, when the target mode is in the third mode, the control unit disconnects the power supply and / or data paths of the first and second video processing units, causing the docking station to shut down its display output. Shutting down the display output here does not simply turn the screen black, but rather controls the power supply or signal path so that neither the first nor the second video processing unit provides valid video output to the corresponding display output interface. The data path can include the USB uplink data path of the first video processing unit and the DP Alt Mode related video signal path of the second video processing unit; the power supply path corresponds to the operating power path of the two types of video processing units. The control unit can further distinguish between charging standby and power-off states according to product settings. In charging standby state, the display output path and the data path of non-video function interfaces are disconnected, but the USB PD power transmission path remains conductive, allowing the host to still receive charging. In power-off state, the data path and power transmission path of non-video function interfaces are also disconnected, with only the control unit remaining to listen for subsequent wake-up operations at extremely low power. This step enables the docking station to adapt to scenarios where users leave their workstations, use it for nighttime standby, or do not use the docking station's functions at all. It can provide a light standby mode that retains only the charging function, or a power-off mode with lower power consumption, thereby expanding the mode switching from simple video output management to comprehensive control of display, data, and power supply paths.

[0065] In an optional embodiment, the step of detecting the interaction operation of the mode switching mechanism through the control unit and determining the target mode state based on the interaction operation includes: Based on the continuous trigger duration and preset time window of the mode switching operation, short press operation, long press operation and double-click operation are identified; Specifically, when identifying short press, long press, and double-click operations based on the continuous trigger duration and preset time window of the mode switching actuator, the control unit first needs to convert the user's mechanical action on the press-type actuator into a recognizable electrical signal, and then the timing logic in the firmware determines which interaction type the action belongs to. The continuous trigger duration refers to the time during which the actuator remains in an effective trigger state from being pressed to being released. The preset time window refers to the limited time the control unit waits for the next press after a press and release, used to determine whether the operation constitutes a double-click. A short press can be set to a press time less than T1 and no second press within the T2 time window, for example, a press time less than 500ms and no further press within 300ms; a double-click can be set to two presses detected within the T2 time window, with each press time less than T1; a long press can be set to a continuous press time reaching T3, for example, reaching 1.5 seconds; and an ultra-long press can also be identified by T4, for example, triggering a reset when the continuous press reaches 3 seconds. In actual testing, the control unit can be implemented by an MCU microcontroller. It collects changes in button voltage levels via the input port. When a button is pressed, a timer starts; when it is released, the duration is recorded. Then, within a preset time window, it continues to monitor for a second valid press. If the press is not released and the duration reaches the long press threshold, the long press operation is directly confirmed. This recognition method allows a single physical button to carry multiple commands such as short press, double press, long press, and extra-long press. This reduces the number of buttons on the casing and distinguishes user intent based on time conditions, avoiding control conflicts between short presses and double presses, or between short presses and long presses.

[0066] When the current mode state is the first mode state or the second mode state, and a short press operation of the mode switching operation element is detected, the mode switches between the first mode state and the second mode state. Specifically, when the current mode is either the first or second mode, and a short press operation is detected, the system switches between the first and second modes. This step primarily corresponds to the two most frequent state transitions during daily use. The first mode is a full-function mode, where the first video processing unit, the second video processing unit, the USB data interface, the RJ45 network port, the audio interface, the SD card slot, and other non-video function interfaces, as well as the USB PD charging path, remain available, suitable for office work, multi-screen displays, and simultaneous connection of peripherals. The second mode is a performance-priority mode, where the control unit disconnects the power supply path or the USB uplink data path of the first video processing unit, causing the first video processing unit to stop USB protocol video output, but the second video processing unit, non-video function interfaces, and the USB PD charging path remain operational. In implementation, after confirming the short press, the control unit first reads the current mode flag. If it is currently in the first mode, it outputs a shutdown control signal to the electronic switch element, causing the corresponding path of the first video processing unit to disconnect and enter the second mode. If it is currently in the second mode, it outputs a conduction control signal to the electronic switch element, causing the first video processing unit to resume operation and enter the first mode. For example, during the daytime office work, users can be in the first mode, simultaneously using USB protocol video output and DPAlt Mode video output. When switching to gaming or HD playback scenarios, a single short press is all it takes to enter the second mode, disabling the USB protocol video processing unit while retaining the native DPAlt Mode video output and other data interfaces. This approach assigns the most frequently used mode switching to the simplest short-press action, allowing users to switch scenarios without unplugging cables or accessing operating system settings, thus improving ease of use.

[0067] When a long press or double-click operation of the mode switching operation is detected, the target mode state is determined to be the third mode state. Specifically, when a long press or double-click operation of the mode switching mechanism is detected, the target mode state is determined to be the third mode state. This step provides the user with an entry point to quickly turn off the display output or enter a low-power state. Although the long press and double-click operations are triggered differently, they can both be considered equivalent paths to enter the third mode state in this solution. The long press is suitable for users to express a clear intention to turn off the device by continuously pressing the button, while the double-click is suitable for users to achieve a quick switch by pressing the button repeatedly. After the control unit detects that the press duration reaches the long press threshold, or detects two valid short presses within a preset time window, it no longer executes the normal switching logic between the first and second mode states. Instead, it directly sets the target mode state to the third mode state and further controls the power supply and / or data path of the first and second video processing units to disconnect, causing all display outputs to turn off. The third mode state further corresponds to the charging standby mode or the complete power-off mode. The former disconnects the display output and the data path of the non-video function interface but retains the USB PD power transmission path, while the latter further disconnects the power transmission path, causing the docking station to enter a more complete shutdown state. For example, if a user temporarily leaves their workstation but still wants their computer to charge, they can enter charging standby mode by long-pressing or double-clicking; when the docking station is no longer in use at night, it can enter a completely powered-off state to reduce standby power consumption. By setting the third mode to be triggered by long-pressing or double-clicking, accidental shutdown of the display output due to ordinary short presses can be avoided, while providing users with a clear and quick operation path when they need to turn off the display output.

[0068] When the current mode state is the third mode state, and a short press operation of the mode switching operation is detected, the target mode state is determined to be the first mode state. The short press operation, the long press operation, and the double-click operation are distinguished according to a first time threshold, a second time threshold, and a third time threshold. The first time threshold is used to determine the duration of a single press, the second time threshold is used to determine the time interval between two adjacent presses, and the third time threshold is used to determine whether the continuous press meets the long press condition.

[0069] Specifically, when the current mode state is the third mode state and a short press operation of the mode switching device is detected, the target mode state is determined to be the first mode state. This step corresponds to the wake-up and recovery logic in the third mode. In the third mode state, the first and second video processing units have stopped display output. If in charging standby mode, the data paths of non-video function interfaces such as USB data, RJ45 network port, and audio are also disconnected, but USB PD charging can still remain on. If in a completely powered-off mode, the display output, non-video function interfaces, and power transmission paths can all be disconnected. Only the control unit itself maintains low-power listening in order to continue receiving trigger signals from the device. After the control unit detects a short press in the third mode state, it no longer interprets the short press as a switch between the first and second mode states. Instead, it directly determines the target mode state to be the first mode state and sequentially restores the power supply or data paths of the first and second video processing units. At the same time, it restores the non-video function interfaces and the USB PD charging path, bringing the docking station back to a fully functional available state. For example, if a user switches the docking station to low-power standby the night before, a single short press the next day will restore all display outputs and peripheral interfaces. There's no need to determine whether it's in charging standby or completely powered off, nor is there a need for multiple button presses to switch between modes. This makes the wake-up logic in the third mode more intuitive and reliable, preventing users from mistakenly believing that some interfaces or video outputs are malfunctioning when they only enter the second mode after reviving from a powered-off state. This improves the certainty of device recovery and enhances the user experience.

[0070] In an optional embodiment, when the target mode state is the second mode state, the control unit executes any of the following control methods: The electronic switching element is controlled to disconnect the USB uplink data path of the first video processing unit and keep the power supply path of the first video processing unit on, so that the first video processing unit stops video output and retains the power-on standby state. Alternatively, the electronic switching element can be controlled to disconnect the power supply path of the first video processing unit, so that the first video processing unit is powered off and stops working.

[0071] Specifically, when the target mode is the second mode, this step provides two optional disconnection paths for the first video processing unit. These paths allow the USB protocol video output path to exit operation without affecting the normal operation of the second video processing unit and non-video function interfaces. The USB uplink data path is the signal path between the first video processing unit and the host for transmitting video data, enumerating devices, and maintaining communication connections via the USB protocol. The electronic switching element can be implemented using a USB differential signal switch, an analog switch, or a path switching circuit driven by the control unit. After the control unit disconnects this path, although the first video processing unit is still supplied with operating voltage by the power supply path, it can no longer receive USB protocol video data from the host, nor can it continue to maintain the corresponding video output connection. Therefore, it stops display output and enters a power-on standby state. The power-on standby state means that the chip still maintains power supply and basic operating conditions, but does not perform effective video transmission. When the user switches back to the first mode state through operations such as short presses, the control unit only needs to reconnect the USB uplink data path, and the first video processing unit can quickly restore its data connection with the host, avoiding the cold start process after a complete power outage. This is suitable for product scenarios with high requirements for mode switching speed. Another approach is to control an electronic switch to disconnect the power supply path to the first video processing unit. The power supply path is the path that provides the operating voltage to the first video processing unit. The electronic switch can be positioned before the VCC power supply pin of the chip, or it can be implemented using a load switch IC or a MOSFET power switch. When the power supply path is disconnected, the first video processing unit stops working, ceasing USB protocol video output, chip operation, and standby power consumption. This method requires a power-on, initialization, and enumeration process to restore the first mode, resulting in a relatively long response time, but it significantly reduces power consumption and heat generation. By setting both the disconnection of the USB uplink data path and the disconnection of the power supply path in parallel, the docking station can select a fast recovery or low-power control strategy based on the chip platform and product positioning. This ensures that the first video processing unit stops video output in the second mode while maintaining compatibility with different hardware implementations.

[0072] In an optional embodiment, when the target mode state is the second mode state, the control unit controls the electronic switching element to disconnect the USB uplink data path of the first video processing unit and keep the power supply path of the first video processing unit on, so that the first video processing unit stops video output and retains the power-on standby state. Alternatively, the control unit controls the electronic switching element to disconnect the power supply path of the first video processing unit, so that the first video processing unit is powered off and stops working; Wherein, after the first video processing unit stops video output, the control unit keeps the DP Alt Mode signal path, DDC channel and HPD signal line of the second video processing unit in a conducting state, so that the first EDID information corresponding to the first video processing unit on the host side is no longer retained as available display device information, and continues to identify the external display device corresponding to the second EDID information transmitted by the second video processing unit through the DDC channel.

[0073] Specifically, when the target mode is the second mode, the control unit does not shut down all display output paths of the docking station, but only selectively disconnects the USB protocol video output path corresponding to the first video processing unit. The USB uplink data path of the first video processing unit is the path for USB protocol video data transmission, endpoint enumeration, and communication maintenance between it and the host, while the power supply path is the power path that provides the operating voltage to the first video processing unit. The control unit can control the electronic switching element to perform either of two methods according to a preset disconnection strategy: one is to disconnect the USB uplink data path of the first video processing unit while keeping its power supply path on, so that the first video processing unit cannot continue to receive video data transmitted by the host via the USB protocol, thereby stopping video output, but the chip itself is still in a power-on standby state, which facilitates quick recovery when switching back to the first mode; the other is to directly disconnect the power supply path of the first video processing unit, so that the first video processing unit is powered off and stops working, thereby further reducing the power consumption and heat generation of the video processing unit.

[0074] In the first control method, an electronic switch element can be located on the USB uplink data path between the first video processing unit and the uplink interface. For example, a USB differential signal switch or analog switch can be used to cut off the corresponding USB data transmission path. Since the power supply path remains conductive, the first video processing unit can retain its basic power-on condition, but it cannot continue to maintain valid USB protocol video output. The virtual display device or first EDID information corresponding to the first video processing unit on the host side will no longer be retained as available display device information. This method is suitable for scenarios where users want to temporarily disable DisplayLink-type USB protocol video output, while also wanting to quickly restore the video output path subsequently. It can balance resource release and mode switching response speed in the second mode.

[0075] In the second control method, electronic switching elements can be placed on the power supply path of the first video processing unit. For example, a MOSFET switch or a load switch IC can be used to control the on and off of its power input. After the power supply path is disconnected, the first video processing unit no longer maintains chip operation, USB endpoint communication, and power-on standby states. This can more effectively reduce the power consumption and heat generation inside the docking station, making it suitable for scenarios where only DP Alt Mode video output is used for extended periods. This method typically requires a power-on restart, initialization, and host-side enumeration to switch back to the first mode, resulting in a relatively long recovery time, but the low-power effect is more significant.

[0076] Regardless of which disconnection method is used, the control unit maintains the DP AltMode signal path, DDC channel, and HPD signal line corresponding to the second video processing unit in a conductive state. Thus, after the first video processing unit stops video output, the first EDID information corresponding to the first video processing unit on the host side is no longer retained as available display device information. However, the second EDID information transmitted by the second video processing unit through the DDC channel can still be recognized by the host, and the connection status of external display devices can continue to be fed back to the host through the HPD signal line. Therefore, in the second mode state, only the USB protocol video output path is closed, not all display and peripheral functions of the docking station. Users can still continue to use DP Alt Mode video output and non-video function interfaces such as USB data, network, audio, and card reading, thereby achieving a balance between disabling DisplayLink-type USB protocol video output and retaining DP Alt Mode display and non-video interface functions.

[0077] In an optional embodiment, when the target mode state is the third mode state, the control unit disconnects the display output path and the data path of the non-video function interface of the expansion dock, while keeping the power transmission path connected; or, the control unit disconnects the display output path, the data path of the non-video function interface, and the power transmission path of the expansion dock.

[0078] Specifically, when the target mode is the third mode, the docking station enters a low-power control scenario with display output disabled. At this time, the control unit no longer distinguishes the working priority of the first and second video processing units, but uniformly disconnects the display output path, causing both the USB protocol video output corresponding to the first video processing unit and the DP Alt Mode video output corresponding to the second video processing unit to stop working. Simultaneously, the control unit also disconnects the data path of non-video function interfaces, preventing USB data interfaces, network interfaces, audio interfaces, card reader interfaces, etc., from communicating with the host. Depending on user needs or product presets, the third mode can further form two states: one is a charging standby state, where while display output and non-video data functions are disabled, the power transmission path remains open, allowing the docking station to continue supplying power to the host or maintaining charging negotiation through USB PD and other power transmission paths. This is suitable for scenarios where users temporarily leave their workstations but still want their laptops to continue charging. The other is a shutdown state, where the control unit further disconnects the power transmission path, causing the docking station to no longer provide display output, data expansion, and power supply functions, only retaining the control unit in a low-power state to listen for subsequent wake-up operations. With the above settings, the third mode can not only turn off the display output, but also provide different levels of low power control between retaining charging and completely shutting down, enabling the docking station to adapt to different usage scenarios such as temporary standby, nighttime shutdown, and long periods of inactivity.

[0079] In summary, the embodiments of the present invention provide a docking station with multi-mode video output switching function and its control method.

[0080] It should be clarified that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0081] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0082] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0083] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0084] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0085] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0086] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A docking station with multi-mode video output switching function, characterized in that, The device includes a housing and a circuit board disposed within the housing. The circuit board is provided with an uplink interface, a first video processing unit, a second video processing unit, an electronic switching element, and a control unit. The outer surface of the housing is provided with a mode switching operation element that is electrically connected to the control unit. The first video processing unit is configured to drive at least one display output via video signals transmitted via the USB protocol; The second video processing unit is configured to drive at least one display output via a video signal transmitted through the DP Alt Mode signal path; The first video processing unit and the second video processing unit receive host signals from the same uplink interface; The electronic switch element is disposed on the power supply path and / or USB uplink data path of the first video processing unit, and is turned on or off by the control unit. The control unit is configured to switch between multiple mode states, including at least a first mode state and a second mode state, in response to the interactive operation of the mode switching mechanism. In the first mode state, both the first video processing unit and the second video processing unit are in working state; In the second mode, the control unit disconnects the power supply path and / or USB uplink data path of the first video processing unit through the electronic switch element, causing the first video processing unit to stop video output, while keeping the non-video function interfaces of the second video processing unit and the docking station in working state.

2. The expansion dock with multi-mode video output switching function according to claim 1, characterized in that, When the first video processing unit is working, it is recognized by the host as a virtual display device and provides the host with first EDID information; The second video processing unit transmits the second EDID information provided by the external display device to the host through the DDC channel; In the first mode state, the host is used to identify two independent display devices corresponding to the first EDID information and the second EDID information; In the second mode state, the USB endpoint corresponding to the first video processing unit is in a deregistered or unenumerable state on the host side, the first EDID information is removed from the display device list of the host, the host maintains identification of the display device corresponding to the second EDID information, and the DP Alt Mode signal path, DDC channel and HPD signal line corresponding to the second video processing unit remain on.

3. The expansion dock with multi-mode video output switching function according to claim 1, characterized in that, The mode switching device is a single press-type device or a multi-position rotary selector switch disposed on the outer surface of the housing. When the mode switching operation is the single press operation, the control unit is configured to switch between the first mode state and the second mode state in response to a short press operation of the single press operation; the control unit is also configured to switch the current mode state to the third mode state in response to a long press operation or a double press operation of the single press operation. When the mode switching operation element is the multi-position rotary selector switch, the multi-position rotary selector switch has at least three physical positioning positions, which correspond to the first mode state, the second mode state, and the third mode state, respectively.

4. The expansion dock with multi-mode video output switching function according to claim 3, characterized in that, In the third mode state, the control unit disconnects the power supply path and / or data path of the first video processing unit and the second video processing unit, causing the docking station to turn off the display output; The third mode state includes at least one of a charging standby state and a power-off state; in the charging standby state, the control unit disconnects the data path of the non-video function interface while keeping the power transmission path of the docking station connected; in the power-off state, the control unit disconnects the data path of the non-video function interface and the power transmission path of the docking station.

5. The expansion dock with multi-mode video output switching function according to claim 1, characterized in that, In the second mode, the control unit controls the electronic switching element to disconnect the USB uplink data path of the first video processing unit while keeping the power supply path of the first video processing unit on; or, the control unit controls the electronic switching element to disconnect the power supply path of the first video processing unit; the electronic switching element includes at least one of a MOSFET switch, a load switch IC, a USB differential signal switch, and an analog switch; the control unit includes a microcontroller MCU.

6. The docking station with multi-mode video output switching function according to claim 1, characterized in that, The expansion dock also includes a status indicator unit; The status indication unit is connected to the control unit and is configured to present a corresponding indication status according to the current mode status of the docking station; The status indicator unit includes an RGB light-emitting element and a light guide structure disposed on the housing. The control unit is used to control the RGB light-emitting element to present different light-emitting colors, flashing frequencies, or on / off states. The light guide structure is used to guide the light emitted by the RGB light-emitting element to the outer surface of the housing.

7. The expansion dock with multi-mode video output switching function according to claim 1, characterized in that, The expansion dock also includes non-volatile memory; The non-volatile memory is connected to the control unit and is used to store the current mode state of the docking station before power failure or after the last switch was completed. The control unit is also configured to read the mode state stored in the non-volatile memory when the dock is powered on again or reconnected to the host, and restore the working mode of the dock according to the read mode state.

8. The docking station with multi-mode video output switching function according to claim 4, characterized in that, The expansion dock also includes an EDID memory; The EDID memory is connected to the control unit and is used to pre-read, cache, or store the EDID information of the external display device; In the charging standby state of the third mode, when the dock stops outputting display images to the external display device and needs to maintain the host-side display device enumeration state, the control unit is configured to execute the first display recognition holding mode or the second display recognition holding mode. When the first display recognition retention mode is executed, the control unit disconnects the display data channel in the corresponding display output path and keeps the DDC channel and HPD signal line physically connected, so that the host can still recognize the external display device when the display data stops transmitting; When the second display identification retention mode is executed, the control unit reads and caches the EDID information of the external display device in advance. After the display data channel in the corresponding display output path is disconnected, the control unit or the EDID memory provides a response to the host based on the cached EDID information and keeps the HPD signal in a valid state to simulate the connection state of the external display device.

9. The docking station with multi-mode video output switching function according to claim 1, characterized in that, The expansion dock also includes a DC power input interface, power management circuitry, and a PD protocol control unit; The DC power input interface is used to receive DC power supplied by an external DC power adapter; The power management circuit supplies power to the first video processing unit, the second video processing unit, the control unit, and the non-video function interface, respectively. The PD protocol control unit is connected to the uplink interface and is used to provide reverse power to the host via the VBUS pin of the uplink interface in accordance with the USB PD protocol specification.

10. A control method for a docking station with multi-mode video output switching function, characterized in that, The method for controlling the docking station with multi-mode video output switching function as described in any one of claims 1-9 includes: The control unit detects the interactive operation of the mode switching operation and determines the target mode state based on the interactive operation. The target mode state includes a first mode state, a second mode state, and a third mode state. When the target mode state is the first mode state, the control unit controls both the first video processing unit and the second video processing unit to be in working state; When the target mode state is the second mode state, the control unit disconnects the power supply path and / or USB uplink data path of the first video processing unit through the electronic switch element, so that the first video processing unit stops video output, and keeps the non-video function interface of the second video processing unit and the docking station in the working state. When the target mode state is the third mode state, the control unit disconnects the power supply path and / or data path of the first video processing unit and the second video processing unit, causing the docking station to turn off the display output.

11. The docking station control method with multi-mode video output switching function according to claim 10, characterized in that, The step of detecting the interaction operation of the mode switching operation element through the control unit and determining the target mode state based on the interaction operation includes: Based on the continuous trigger duration and preset time window of the mode switching operation, short press operation, long press operation and double-click operation are identified; When the current mode state is the first mode state or the second mode state, and a short press operation of the mode switching operation element is detected, the mode switches between the first mode state and the second mode state. When a long press or double-click operation of the mode switching operation is detected, the target mode state is determined to be the third mode state. When the current mode state is the third mode state, and a short press operation of the mode switching operation is detected, the target mode state is determined to be the first mode state. The short press operation, the long press operation, and the double-click operation are distinguished according to a first time threshold, a second time threshold, and a third time threshold. The first time threshold is used to determine the duration of a single press, the second time threshold is used to determine the time interval between two adjacent presses, and the third time threshold is used to determine whether the continuous press meets the long press condition.

12. The control method for the expansion dock with multi-mode video output switching function according to claim 10, characterized in that, When the target mode state is the second mode state, the control unit controls the electronic switch element to disconnect the USB uplink data path of the first video processing unit and keep the power supply path of the first video processing unit on, so that the first video processing unit stops video output and retains the power-on standby state. Alternatively, the control unit controls the electronic switching element to disconnect the power supply path of the first video processing unit, so that the first video processing unit is powered off and stops working; Wherein, after the first video processing unit stops video output, the control unit keeps the DP Alt Mode signal path, DDC channel and HPD signal line of the second video processing unit in a conducting state, so that the first EDID information corresponding to the first video processing unit on the host side is no longer retained as available display device information, and continues to identify the external display device corresponding to the second EDID information transmitted by the second video processing unit through the DDC channel.

13. The control method for the expansion dock with multi-mode video output switching function according to claim 10, characterized in that, When the target mode state is the third mode state, the control unit disconnects the display output path and the data path of the non-video function interface of the expansion dock, while keeping the power transmission path connected; or, the control unit disconnects the display output path, the data path of the non-video function interface, and the power transmission path of the expansion dock.

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