Display system and display device

Abstract

A display system and a display device, the display device includes a universal serial bus (USB) Type-C connector to connect to a portable device, wherein USB signals between the display device and the portable device include an image transmission channel and a data transmission channel; a display panel; a multiplexing circuit to separate the image transmission channel and the data transmission channel of the USB signals; a switching circuit to control an operation mode of the multiplexing circuit; and a display controller to control a display mode of the display panel. In response to the display panel being in a first display mode, the display controller transmits a control signal to the switching circuit to control the multiplexing circuit to switch to a first operation mode. In response to the multiplexing circuit being in the first operation mode, the portable device is a master in the image transmission channel and is a slave in the data transmission channel.

Description

Technical Field

[0001] This invention relates to display devices, and more particularly to a display system and display device. Background Technology

[0002] Currently, display devices on the market (such as televisions or computer screens) have increasingly diverse functions and can connect to various image source devices, such as personal computers and portable devices. In addition, portable devices are equipped with storage media, but due to the limitations of traditional display devices, when a personal computer and a portable device are used as image sources at the same time, the personal computer cannot access the data stored on the portable device's storage media, thus reducing the user experience. Summary of the Invention

[0003] In view of this, the present invention provides a display system and display device to solve the above problems.

[0004] This invention provides a display device, comprising: a Universal Serial Bus (USB) Type-C connector for connecting to a portable device, wherein the USB signal between the display device and the portable device includes an image transmission channel and a data transmission channel; a display panel; a multiplexing circuit for separating the image transmission channel and the data transmission channel of the USB signal; a switching circuit for controlling the operating mode of the multiplexing circuit; and a display controller for controlling the display mode of the display panel. When the display panel is in a first display mode, the display controller sends a control signal to the switching circuit to control the multiplexing circuit to switch to the first operating mode. When the multiplexing circuit is in the first operating mode, the portable device is the master control terminal in the image transmission channel and the device terminal in the data transmission channel.

[0005] In some embodiments, the display controller receives a first image signal from a host device via a first transmission interface of the display device, and receives a second image signal from a portable device via an image transmission channel. Furthermore, the first display mode is a picture-in-picture mode or a side-by-side display mode.

[0006] In some embodiments, the display device further includes: a USB hub for connecting at least one peripheral device and receiving a first data signal from a host via a second transmission interface of the display device, wherein, in response to the multiplexing circuit being in a first operating mode, the first data signal is transmitted sequentially through the USB hub, the switching circuit and the multiplexing circuit to the portable device, so that the host can identify the storage medium in the portable device and access the data in the storage medium.

[0007] In some embodiments, for a data transfer channel, the USB Type-C connector is a USB Type-C downstream port extended by a USB hub.

[0008] In some embodiments, the display device further includes an input interface for calling an on-screen display interface, and the on-screen display interface is used to select, in a first display mode, a display screen for controlling a first image signal or a second image signal using at least one peripheral device.

[0009] In some embodiments, when the first display mode is a mother-and-child screen mode, the display controller sends a control signal to the switching circuit to connect the data signal of at least one peripheral device connected to the USB hub to the host or portable device corresponding to the mother screen.

[0010] The present invention also provides a display system, comprising: a portable device and a display device. The display device includes: a Universal Serial Bus (USB) Type-C connector for connection to the portable device, wherein the USB signal between the display device and the portable device includes an image transmission channel and a data transmission channel; a display panel; a multiplexing circuit for separating the image transmission channel and the data transmission channel of the USB signal; a switching circuit for controlling the operating mode of the multiplexing circuit; and a display controller for controlling the display mode of the display panel. In response to the display panel being in a first display mode, the display controller transmits a control signal to the switching circuit to control the multiplexing circuit to switch to the first operating mode. In response to the multiplexing circuit being in the first operating mode, the portable device is the master control terminal in the image transmission channel and the device terminal in the data transmission channel. Attached Figure Description

[0011] Figure 1 This is a schematic diagram showing a display system according to an embodiment of the present invention.

[0012] Figures 2A to 2C This is a schematic diagram of the path of image signals and data signals in different display modes of a display system according to an embodiment of the present invention.

[0013] Symbol Explanation

[0014] 1: Display System

[0015] 10: Electronic devices

[0016] 20: Portable devices

[0017] 21: Display screen

[0018] 23: Storage Media

[0019] 31: Image transmission channel

[0020] 32: Data transmission channel

[0021] 33: Transmission Channel

[0022] 50-52: Dashed line path

[0023] 100: Host

[0024] 110: Processing Unit

[0025] 111: System Bus

[0026] 120: Graphics Processing Unit

[0027] 130: Memory unit

[0028] 140: Storage device

[0029] 141: Application

[0030] 142: Operating System

[0031] 152, 153 ~ Transmission Interface

[0032] 200: Display device

[0033] 210: Display controller

[0034] 211: Image Scaler

[0035] 212: Timing Controller

[0036] 220: Display module

[0037] 230: Storage unit

[0038] 231, 232: Firmware

[0039] 233: Interface displayed on the screen

[0040] 240: Image buffer

[0041] 251-255: Transmission Interface

[0042] 260: Input Interface

[0043] 261: Physical button

[0044] 262: Five-way control lever

[0045] 270: USB Hub

[0046] 281: Multiplexing Circuit

[0047] 282: Switching Circuit

[0048] 283: Control signal

[0049] 284-285: Passage

[0050] 291, 292: Peripheral devices Detailed Implementation

[0051] The following description illustrates preferred embodiments of the invention and is intended to describe the basic concept of the invention, but is not intended to limit the invention. The actual scope of the invention must be understood within the framework of the following claims.

[0052] It must be understood that the words “comprising” and “including” used in this specification are used to indicate the presence of specific technical features, values, method steps, work processes, elements and / or components, but do not preclude the addition of more technical features, values, method steps, work processes, elements, components, or any combination thereof.

[0053] The use of terms such as "first," "second," and "third" in the claims is to modify the elements in the claims, and is not to indicate a priority order, a prior relationship, or that one element precedes another, or the chronological order of the execution of method steps. It is only used to distinguish elements with the same name.

[0054] Figure 1 This is a schematic diagram showing a display system according to an embodiment of the present invention.

[0055] Display system 1 includes a host computer 100, a display device 200, and a portable device 20. The host computer 100 and the display device 200 can be considered as an electronic device 10, such as a personal computer, laptop computer, server, or smart TV equipped with a display device; and in the electronic device 10, all components except the display device 200 are collectively defined as the host computer. The display device 200 can be a liquid crystal display, computer screen, electronic signage, television, or any device capable of displaying images. Figure 1 As shown, the electronic device 10 includes a host 100 and a display device 200, wherein both the host 100 and the portable device 20 are signal-connected to the display device 200. The host 100 includes, for example, a processing unit 110, a graphics processing unit 120, a memory unit 130, a storage device 140, and transmission interfaces 152 and 153. The processing unit 110, graphics processing unit 120, memory unit 130, storage device 140, and transmission interface 153 are interconnected via a system bus 111. The processing unit 110 may be, for example, a central processing unit (CPU), a general-purpose processor, etc., but the present invention is not limited thereto. The graphics processing unit 120 may be, for example, a graphics processing unit on a display card or a graphics processing unit integrated into the processor 110.

[0056] Memory cell 130 is a random access memory, such as dynamic random access memory (DRAM) or static random access memory (SRAM), but the present invention is not limited thereto. Storage device 140 is a non-volatile memory, such as a hard disk drive, a solid-state disk, a flash memory, or a read-only memory, but the present invention is not limited thereto.

[0057] For example, storage device 140 may store one or more applications 141 and an operating system 142 (e.g., Windows, Linux, MacOS, etc.), and processing unit 110 may read one or more applications 141 and operating system 142 into memory unit 130 and execute them. Graphics processing unit 120 may, for example, perform drawing processing on the applications executed by processing unit 110 to generate an image signal including one or more images, and transmit the image signal to transmission interface 252 of display device 200 through transmission interface 152, wherein the channel between transmission interfaces 152 and 252 may be referred to as an image transmission channel. The transmission interfaces 152 and 252 may be wired transmission interfaces and / or wireless transmission interfaces. The wired transmission interfaces may include: High Definition Multimedia Interface (HDMI), DisplayPort (DP) interface, embedded DisplayPort (eDP) interface, low voltage differential signaling (LVDS) interface, Universal Serial Bus (USB) interface, USB Type-C interface, Thunderbolt interface, Digital Video Interface (DVI), Video Graphics Array (VGA) interface, General Purpose Input / Output (GPIO) interface, Universal Asynchronous Receiver / Transmitter (UART) interface, Serial Peripheral Interface (SPI) interface, Integrated Circuit Bus (I2C) interface, or combinations thereof. The wireless transmission interfaces may include: Bluetooth, Wi-Fi, Near Field Communication (NFC) interface, etc., but the present invention is not limited thereto.

[0058] Furthermore, the processing unit 110 can, for example, transmit data to the transmission interface 253 of the display device 200 via the transmission interface 153, where the transmission interfaces 153 and 253 can be, for example, USB interfaces, and can support USB 3.1 and / or USB 2.0 protocols. The channel between the transmission interfaces 153 and 253 can be called a data transmission channel. For example, the host 100 and the display device 200 can transmit data via the four SuperSpeed ​​channels and / or two FullSpeed ​​channels of the USB 3.1 protocol. It should be noted that the transmission interface 253 on the display device 200 is, for example, a UFP (Upstream Facing Port) Type B connection port, meaning that when the host 100 and the display device 200 are transmitting data, the host 100 acts as the host and the display device 200 acts as the device.

[0059] Furthermore, the portable device 20 may be, for example, a smartphone, tablet, or laptop computer, and includes a display screen 21 for displaying images and a storage medium 23 (e.g., a non-volatile storage medium) for storing data. Additionally, the portable device 20 can connect to the display device 200's transmission interface 251 via its transmission interface 22, wherein transmission interfaces 22 and 251 may be, for example, USB Type-C connectors and support USB 3.1 Gen 1 or higher protocols. Specifically, the channel between transmission interfaces 22 and 251 includes an image transmission channel and a data transmission channel. For example, the portable device 20 can transmit image signals to the display device 200 via the two SuperSpeed ​​channels of the USB Type-C interface, and perform data transmission with the display device 200 via the two SuperSpeed ​​channels and two HighSpeed ​​channels of the USB Type-C interface. Optionally, in DisplayPort Alternate mode, portable device 20 can transmit video signals to display device 200 via the four SuperSpeed ​​channels of the USB Type-C interface, and transmit data with display device 200 via the two HighSpeed ​​channels of the USB Type-C interface. It should be noted that the transmission interface 251 of display device 200 is, for example, a UFP (Upstream Facing Port) Type B connection port, meaning that when portable device 20 and display device 200 are transmitting data, portable device 20 acts as the host and display device 200 acts as the device.

[0060] The display device 200 may be, for example, a flat panel display, a television, a projector, a computer screen, etc., but the present invention is not limited thereto. The display device 200 includes a display controller 210, a display module 220, a storage unit 230, an image buffer 240, transmission interfaces 251-255, an input interface 260, and a USB hub 270.

[0061] The display controller 210 may be, for example, an application-specific integrated circuit, a system-on-chip, a processor, or a microcontroller, but the present invention is not limited thereto.

[0062] The display module 220 may be, for example, a liquid crystal panel, a light-emitting diode panel, an organic light-emitting diode panel, a cathode ray tube, an electronic ink (E-Ink) display module, an electroluminescent display module, a plasma display module, a projection display module, or a quantum dot display module, but the present invention is not limited thereto.

[0063] Storage unit 230 may be a non-volatile memory, such as a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or an electronically erasable programmable read-only memory (EEPROM). Storage unit 230 is used to store firmware 231 related to the display device 200. Storage unit 230 may be external to the display controller 210 or integrated into the display controller 210.

[0064] Firmware 231 includes, for example, display settings and Extended Display Identification Data (EDID) of the on-screen display interface of the display device 200, display settings, and one or more on-screen-display (OSD) interfaces 233. The Extended Display Identification Data includes, for example, the manufacturer, product name, resolution, and frames per second of the display device 200. Display settings include, for example, settings for brightness, contrast, sharpness, and color temperature of the display device 200. Firmware 232 is used to control the on-screen display interface 233 of the display device 200.

[0065] In one embodiment, the display controller 210 can read the firmware 231-232 and the program code of the OSD interface 233 stored in the storage unit 230 via a bus (e.g., an I2C bus) and set the relevant display parameters accordingly. Furthermore, the display controller 210 can also transmit extended display capability identification data of the display device 200 to the host 100 via the transmission interface 252 or 253 (e.g., an image transmission channel or a data transmission channel, respectively), so that the processing unit 110 and the graphics processing unit 120 in the host 100 can set the resolution of the output image signal and related synchronization signals. The on-screen display interface 233 may include, for example, an on-screen display menu (OSD Menu) and options, an information dashboard, a timer, a counter, a crosshair, specific symbols, specific colors, specific text, or combinations thereof, but the present invention is not limited thereto.

[0066] The image buffer 240 may be a volatile memory (e.g., dynamic random access memory) or a non-volatile memory (e.g., flash memory) for storing the output image to be played on the display module 220. The host 100 or the display controller 210 may, according to a screen display enable signal generated by the host 100, cover a specific area of ​​the image signal stored in the image buffer 240 with one or more screen display interfaces 233 to generate the output image.

[0067] Input interface 260 is used to control the on-screen menu displayed on display device 200. Input interface 260 can be implemented, for example, by a five-way joystick 262 or by five physical buttons 261, thereby enabling commands such as up, down, left, right, and confirm. Hub 270 can be, for example, a USB hub, and host 100 can transmit data to display controller 210 via transmission interfaces 153 and 253 (e.g., USB interfaces) through hub 270, and display controller 210 can also transmit data to host 100 via transmission interfaces 153 and 253 through hub 270.

[0068] USB hub 270 can receive USB data signals from host 100 via transmission interface 253 (e.g., USB Type-C interface), or display controller 210 can transmit USB data signals to host 100 via transmission interface 253. The USB data signals include, for example, USB SuperSpeed ​​Data Signal and USB HighSpeed ​​Data Signal. The USB SuperSpeed ​​Data Signal is, for example, a data signal that supports USB 3.1 Gen 1 or higher speeds and can transmit data through the two USB SuperSpeed ​​transmission channels of the USB Type-C interface. USB High Speed ​​Transfer Channels 1 and 2 (Lane 0) are, for example, pins A2-A3 (TX1+ and TX1-) and B10-B11 (RX1- and RX1+) of transfer interface 253 (e.g., USB Type-C interface), and USB High Speed ​​Transfer Channels 3 and 4 (Lane 1) are, for example, pins A10-A11 (RX2- and RX2+) and B2-B3 (TX2+ and TX2-) of transfer interface 253 (e.g., USB Type-C interface). The USB High Speed ​​Data Signal is a data signal supporting USB 2.0 speeds, and data transmission can be performed, for example, through the differential signal pairs (D+ and D- pins) of pins A6-A7 or B6-B7 in the USB Type-C interface that are compatible with USB 2.0. Furthermore, the display device 200 also includes transfer interfaces 254 and 255 (e.g., USB Type-A interfaces), which can be connected to peripheral devices 291 and 292, such as a keyboard, mouse, or other external USB storage devices, respectively.

[0069] The multiplexing circuit 281 separates the image signal and data signal from the USB signal received by the transmission interface 251 from the portable device 20, and transmits the image signal to the display controller 210 and the data signal to the switching circuit 282. Depending on the transmission mode of the transmission interface 251, the image signal can use four high-speed channels or two high-speed channels in the USB Type-C interface, and the data signal can use two high-speed channels, or two high-speed channels plus two high-speed channels in the USB Type-C interface.

[0070] The switching circuit 282 controls the operating mode of the multiplexing circuit 281, such as the first operating mode and the second operating mode, based on the control signal from the display controller 210, the details of which will be described later.

[0071] Figures 2A to 2C This is a schematic diagram of the path of image signals and data signals in different display modes of a display system according to an embodiment of the present invention.

[0072] exist Figure 2A In this display mode, the host 100 transmits image signals to the display controller 210 via transmission interfaces 152 and 252 (e.g., image transmission channel 31), and the display controller 210 plays the image signals on the display module 220. It should be noted that the display controller 210 ignores image signals from the portable device 20 at this time, and the switching circuit 282 disconnects data transmission between the multiplexing circuit 281 and the switching circuit 282. Furthermore, the host 100 also transmits data to the USB hub 270 via transmission interfaces 153 and 253 (e.g., data transmission channel 32), so peripheral devices 291 and 292 can communicate with the host 100 via data transmission channel 32 (as shown by the dotted path 50). In this display mode, the host 100 can recognize peripheral devices 291 and 292 via data transmission channel 32, so the user can operate the display screen of the host 100 through peripheral devices 291 and 292, such as inputting keyboard signals, controlling the screen cursor, or pressing mouse buttons, etc.

[0073] exist Figure 2B In this display mode, the portable device 20 transmits image and data signals to the multiplexing circuit 281 via transmission interfaces 22 and 251 (e.g., transmission channel 33). The multiplexing circuit 281 transmits the image signals to the display controller 210, which then plays the image signals on the display module 220. It should be noted that the display controller 210 ignores the image signals from the host 100 at this time. In this display mode, the display controller 210 transmits control signals 283 (e.g., a high-logic GPIO signal) to the switching circuit 282, and the multiplexing circuit 281 transmits data signals via channel 284 (e.g., the UFP_0a channel) of the switching circuit 282 to the USB hub 270 (as shown by the dashed path 51). Therefore, for data signals, the portable device 20 acts as the host (i.e., the transmission interface 22 is the downlink port DFP), and the peripheral devices 291 and 292 connected to the USB hub 270 act as devices (i.e., the transmission interface 251 is the uplink port UFP). Furthermore, for video signals, the portable device 20 acts as either the host or the source, and the display controller 210 acts as either the client or the device.

[0074] Therefore, in Figure 2B In the display mode, the multiplexing circuit 281 is switched to the second operation mode, in which the portable device acts as the master control terminal in both the data transmission channel and the image transmission channel. Furthermore, via... Figure 2BWith the above-mentioned connection method of the image transmission channel and data transmission channel, the portable device 20 can project its screen image to the display device 200, and the user can also use peripheral devices 291 and 292 to control the display image of the portable device 20.

[0075] exist Figure 2C In the display mode, the display device 200 is set to either picture-in-picture (PIP) mode or picture-by-picture (PBPS) dual-screen mode, referred to here as the first display mode. This means that the display controller 210 will simultaneously receive the first image signal from the host 100 and the second image signal from the portable device 20, and perform corresponding scaling and overlay processing on the first and second image signals according to the set display mode. This is common knowledge in the field of this invention, so its details will not be elaborated further.

[0076] If according to Figure 2A and Figure 2B In the display mode, for the display device 200, both the host 100 and the portable device 20 act as the master control end, regardless of whether it's the image transmission channel or the data transmission channel. In other words, both USB Type-C ports 251 and 253 in the display device 200 are uplink ports (UFP). However, in... Figure 2C In the mother-and-child screen mode or side-by-side screen mode, because the host 100 and the portable device 20 respectively output the first image signal and the second image signal to the display device 200, and the image signal and data signal in the conventional USB Type-C interface have the same role (e.g., both are uplink or downlink ports), that is, the corresponding USB Type-C interface connected to the host 100 and the portable device 20 is also an uplink port. Therefore, for both image and data signals, for the conventional display device, the host 100 and the portable device 20 still act as the master. In this case, although the host 100 and the portable device 20 are both connected to the same conventional display device, the host 100 cannot recognize the storage medium 23 in the portable device 20, that is, the host 100 cannot access the data in the storage medium 23 in the portable device 20 at this time. However, the display device 200 of the present invention can solve the above-mentioned technical problem.

[0077] In detail, Figure 2CIn the parent-child screen mode or side-by-side screen mode, the host 100 remains the source or controller of both image and data signals, and the USB data signal of the display device 200's transmission interface 253 is connected to the USB hub 270, which extends two USB Type A ports (i.e., transmission interfaces 254 and 255). At this time, the display controller 210 transmits control signals (e.g., a low logic state) to the switching circuit 282, and the output signal of the USB hub 270 is connected to the transmission interface 251 via channel 285 (e.g., the DFP_0b channel) through the multiplexing circuit 281. Therefore, for data signals, the transmission interface 251 changes from the original USB Type-C uplink port UFP to the USB Type-C downlink port DFP, which is an extension of the USB hub's functionality. Therefore, in Figure 2C In the PIP / PBP display mode, the multiplexing circuit 281 is switched to the first operating mode. In the first operating mode, peripheral devices 291 and 292 are connected to the host 100, and the data signals of the host 100 can communicate with the portable device 20 via the USB hub 270, the switching circuit 282, and the multiplexing circuit 281 (as shown by the dashed path 52). The portable device 20 is the master terminal in the image transmission channel, but the device terminal in the data transmission channel. Therefore, when the display device 200 is set to the picture-in-picture mode or the side-by-side mode, the host 100 can identify the storage medium 23 in the portable device 20 via the above data path and access the data in the storage medium 23.

[0078] In another embodiment, although the display device 200 can be configured in either a picture-in-picture mode or a side-by-side mode, peripheral devices 291 and 292 are connected to the USB hub 270 of the display device 200. Therefore, peripheral devices 291 and 292 can only control the display screen of one of the host device 100 and the portable device 20. In this case, the user can call the OSD interface 233 through the input interface 262 of the display device 200 and select the transmission interface of the host terminal corresponding to the data signals of peripheral devices 291 and 292 from the OSD interface 233, for example, transmission interface 251 or 253.

[0079] In another embodiment, when the display device 200 is set to a picture-in-picture mode, the display controller 210 sends a corresponding control signal to the switching circuit 282 to connect the data signals of the peripheral devices 291 and 292 connected to the USB hub 270 to the corresponding device in the picture-in-picture mode. If the display screen of the host 100 is the picture-in-picture mode, the USB hub 270 switches the data signals of the peripheral devices 291 and 292 to the corresponding transmission interface 253. If the display screen of the portable device 20 is the picture-in-picture mode, the USB hub 270 switches the data signals of the peripheral devices 291 and 292 to the corresponding transmission interface 251 (via the switching circuit 282 and the multiplexing circuit 281).

[0080] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the scope of the invention. Any person skilled in the art can make some changes and modifications without departing from the concept and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A display device, characterized in that, include: A USB Type-C connector for connecting to a portable device, wherein the USB signal between the display device and the portable device includes an image transmission channel and a data transmission channel; A display panel; A multiplexing circuit for separating the image transmission channel and the data transmission channel of the USB signal; A switching circuit is used to control the operating mode of the multiplexing circuit; as well as A display controller is used to control the display mode of the display panel; In this configuration, since the display panel is in a first display mode, the display controller sends a control signal to the switching circuit to control the multiplexing circuit to switch to the first operating mode. In this configuration, since the multiplexing circuit is in the first operating mode, the portable device is the main control terminal in the image transmission channel and the device terminal in the data transmission channel. The display controller receives a first image signal from a host computer via a first transmission interface of the display device, and receives a second image signal from the portable device via the image transmission channel. The first display mode is either a mother-and-child screen mode or a side-by-side screen mode. The feature is that it further includes: a USB hub for connecting at least one peripheral device and receiving a first data signal from the host via a second transmission interface of the display device. In this mode, as the multiplexing circuit is in the first operating mode, the first data signal is transmitted sequentially through the USB hub, the switching circuit, and the multiplexing circuit to the portable device, so that the host can identify the storage medium in the portable device and access the data in the storage medium.

2. The display device as claimed in claim 1, characterized in that, For this data transmission channel, the USB Type-C connector is an extended USB Type-C downstream port for the USB hub.

3. The display device as claimed in claim 1, characterized in that, It also includes an input interface for calling an on-screen display interface, which is used to select, in the first display mode, the display screen of the first image signal or the second image signal to be controlled by the at least one peripheral device.

4. The display device as claimed in claim 1, characterized in that, When the first display mode is the mother-child screen mode, the display controller sends a control signal to the switching circuit so that the data signal of the at least one peripheral device connected to the USB hub is connected to the host or portable device corresponding to the mother screen.

5. A display system, characterized in that, include: A portable device; One host computer; as well as A display device, comprising: A USB Type-C connector for connecting to the portable device, wherein the USB signal between the display device and the portable device includes an image transmission channel and a data transmission channel; A display panel; A multiplexing circuit for separating the image transmission channel and the data transmission channel of the USB signal; A switching circuit is used to control the operating mode of the multiplexing circuit; and A display controller is used to control the display mode of the display panel; In this configuration, since the display panel is in a first display mode, the display controller sends a control signal to the switching circuit to control the multiplexing circuit to switch to the first operating mode. In this configuration, since the multiplexing circuit is in the first operating mode, the portable device is the main control terminal in the image transmission channel and the device terminal in the data transmission channel. The display controller receives a first image signal from the host computer via a first transmission interface of the display device, and receives a second image signal from the portable device via the image transmission channel. The first display mode is either a mother-and-child screen mode or a side-by-side screen mode. The display device is characterized by further including a USB hub for connecting at least one peripheral device and receiving a first data signal from the host via a second transmission interface of the display device. In this mode, as the multiplexing circuit is in the first operating mode, the first data signal is transmitted sequentially through the USB hub, the switching circuit, and the multiplexing circuit to the portable device, so that the host can identify the storage medium in the portable device and access the data in the storage medium.

6. The display system as described in claim 5, characterized in that, For this data transmission channel, the USB Type-C connector is an extended USB Type-C downstream port for the USB hub.

7. The display system as described in claim 5, characterized in that, The display device further includes an input interface for calling an on-screen display interface, and the on-screen display interface is used to select, in the first display mode, the display screen of the first image signal or the second image signal to be controlled by the at least one peripheral device.

8. The display system as described in claim 5, characterized in that, When the first display mode is the mother-child screen mode, the display controller sends a control signal to the switching circuit so that the data signal of the at least one peripheral device connected to the USB hub is connected to the host or portable device corresponding to the mother screen.

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