Electronic device and display state control method used by same

Abstract

The invention discloses an electronic device and a display state control method used by the same. The method comprises the following steps: transmitting a first control signal and a second control signal; generating a second sensing signal according to the received second control signal and the received first sensing signal, where the first sensing signal varies with whether the physical display is accessed to the display interface circuit; generating a third sensing signal according to the received first control signal and the second sensing signal; switching an output pattern of a switch of the electronic device according to the first sensing signal so as to output the received first data as third data or output the second data received from the storage circuit as the third data; and outputting a third sensing signal and third data.

Description

Technical Field

[0001] The invention relates to an electronic device, and in particular to an electronic device for controlling a display state. Background Art

[0002] Traditionally, a computer host is usually equipped with a monitor. When a user needs to change the connection status of the monitor, it must be done manually, such as plugging and unplugging the monitor's connection cable or directly turning off the power of the screen. However, this design has some significant limitations and problems.

[0003] First, in certain situations or environments, such as large exhibition halls, the cables of these displays may be sealed or hidden, making it difficult for users to directly plug and unplug the cables. In addition, there may be certain situations where it is not allowed or recommended to directly turn on or off the power of the display, which may be due to safety, performance or other considerations. Furthermore, some specific industrial computers may not need to be connected to a display. But there is another problem, that is, even in situations where a display is not needed, their application software may still be designed to be connected to a display to run, which causes inconvenience in operation and loss of efficiency.

[0004] In summary, the design and use of traditional computer hosts and monitors have some difficulties and challenges, especially in specific working environments or demand scenarios. Summary of the invention

[0005] One embodiment of the present invention provides an electronic device coupled to a host. The electronic device includes: a display state control circuit and a controller. The controller is coupled to the display state control circuit. The display state control circuit includes: a first terminal for receiving a first sensing signal; a second terminal for receiving first data; a switch coupled to the controller, the first terminal and the second terminal, wherein the first terminal and the second terminal are coupled to a display interface circuit for providing a physical display to access the host, wherein the first sensing signal changes depending on whether the physical display is connected to the display interface circuit; and a storage circuit coupled to the switch for storing a second data. The controller transmits a first control signal and a second control signal to the display state control circuit. The display state control circuit generates a second sensing signal according to a second control signal received from the controller and a first sensing signal received from the first endpoint, wherein the display state control circuit generates a third sensing signal according to the first control signal received from the controller and the second sensing signal, wherein the display state control circuit switches the output state of the switch according to the first sensing signal to output the first data as a third data to the controller, or outputs the second data received from the storage circuit as the third data to the controller, wherein the display state control circuit outputs the third sensing signal and the third data to the controller.

[0006] Another embodiment of the present invention provides a display state control method for an electronic device, wherein the electronic device is coupled to a host. The electronic device includes: a display state control circuit and a controller. The controller is coupled to the display state control circuit, and the display state control circuit is coupled to a display interface circuit for providing a physical display to access the host. The method includes: transmitting a first control signal and a second control signal to the display state control circuit via the controller; generating a second sensing signal via the display state control circuit according to the second control signal received from the controller and the first sensing signal received from the first terminal of the display state control circuit, wherein the first sensing signal varies with whether the physical display is connected to the display interface circuit; generating a third sensing signal via the display state control circuit according to the first control signal and the second sensing signal received from the controller; switching the output state of the switch of the display state control circuit according to the first sensing signal via the display state control circuit, so as to output the first data received from the second terminal of the display state control circuit as the third data to the controller, or output the second data received from the storage circuit of the display state control circuit as the third data to the controller; and outputting the third sensing signal and the third data to the controller via the display state control circuit.

[0007] In one embodiment of the present invention, the second data is Extended Display Identification Data (EDID) of a virtual display.

[0008] In one embodiment of the present invention, when a physical display is connected, the first sensing signal received by the first endpoint is a first value, the first sensing signal (HPD1) is input to the switch, and first data is input from the physical display to the first endpoint, wherein the first data includes screen identification data of the physical display, wherein when no physical display is connected, the first sensing signal received by the first endpoint is a second value.

[0009] In one embodiment of the present invention, the output state of the switch includes a first output state and a second output state, wherein in response to receiving a first sensing signal with a first value, the switch is switched to the first output state and the first data is output to the controller as the third data, wherein in response to receiving the first sensing signal with a second value, the switch is switched to the second output state and the second data is output to the controller as the third data.

[0010] In one embodiment of the present invention, the display state control circuit further includes: an AND gate coupled to the first terminal and the controller to receive the first sensing signal and the second control signal; and an OR gate coupled to the AND gate and the controller to receive the second sensing signal and the first control signal. The AND gate generates the second sensing signal according to the input first sensing signal and the second control signal, and the OR gate generates the third sensing signal according to the input second sensing signal and the first control signal.

[0011] In one embodiment of the present invention, the controller is used to transmit a first control signal and a second control signal to instruct the display state control circuit to switch the display state of the host to a normal state, a forced disconnection state or a forced connection state, wherein the display state control circuit outputs a third sensing signal and a third data to the controller to complete the operation of switching the display state of the host to a normal state, a forced disconnection state or a forced connection state.

[0012] In one embodiment of the present invention, the controller transmits a first control signal of a second value and a second control signal of a first value to a display status control circuit to indicate that the display status of the host to be switched is a normal status, wherein the controller transmits a first control signal of a second value and a second control signal of a second value to the display status control circuit to indicate that the display status of the host to be switched is a forced disconnection status, wherein the controller transmits a first control signal of a first value to the display status control circuit to indicate that the display status of the host to be switched is a forced connection status.

[0013] In one embodiment of the present invention, the controller transmits a first control signal of a second value and a second control signal of a first value to a display state control circuit to indicate to switch the display state of the host to a normal state. The operation includes: when a physical display is connected to an electronic device, the first sensing signal is a first value, the generated second sensing signal is a first value, and the generated third sensing signal is a first value, wherein the third sensing signal of the first value is used to inform that a display is being connected to the host, and the third data is used to indicate the screen identification data of the connected physical display, wherein when no physical display is connected to the electronic device, the first sensing signal is a second value, the generated second sensing signal is a second value, and the generated third sensing signal is a second value, wherein the third sensing signal of the second value is used to inform that no display is being connected to the host.

[0014] In one embodiment of the present invention, the controller transmits a first control signal of a second value and a second control signal of a second value to a display state control circuit to indicate to switch the display state of the host to a forced disconnection state. The operation includes: when the physical display is connected to the electronic device, the first sensing signal is the first value, the generated second sensing signal is the second value, and the generated third sensing signal is the second value, wherein the third sensing signal of the second value is used to inform that no display is being connected to the host, wherein when no physical display is connected to the electronic device, the first sensing signal is the second value, the generated second sensing signal is the second value, and the generated third sensing signal is the second value.

[0015] In one embodiment of the present invention, the controller transmits a first control signal of a first value to the display state control circuit to indicate the operation of switching the display state of the host to a forced access state, including: when the physical display is connected to the electronic device, the first sensing signal is a first value, and the generated third sensing signal is a first value, wherein the third sensing signal of the first value is used to inform that a display is being connected to the host, and the third data is used to indicate the screen identification data of the connected physical display, wherein when no physical display is connected to the electronic device, the first sensing signal is a second value, and the generated third sensing signal is a first value, wherein the third sensing signal of the first value is used to inform that a virtual display is being connected to the host, and the third data is used to indicate the screen identification data of the connected virtual display.

[0016] Based on the above, the present invention provides an electronic device and a display status control method used therein, which have the following significant technical benefits: (1) Convenient display control: The method allows the user to make settings to control the connected or disconnected state of the display without actually plugging in or unplugging the display. This greatly enhances flexibility and convenience, especially in situations where it is difficult to directly change the connection between the display cable and the display interface; (2) Virtual display simulation: In situations where no physical display is connected, the method can simulate a virtual display. This provides an effective solution for those specific applications or environments that require a display to be connected to operate normally, but do not really need an actual display. In summary, the present invention not only greatly improves the flexibility of use of electronic devices, but also solves some limitations and problems in traditional designs and provides more operating options and possibilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 4 is a block diagram of an electronic device according to an embodiment of the present invention.

[0018] Figure 2is a flow chart of a display state control method according to an embodiment of the present invention.

[0019] Figure 3 is a schematic diagram of a display state control method according to an embodiment of the present invention.

[0020] The reference numerals are described as follows:

[0021] 100: Electronic devices

[0022] 200: Display

[0023] 300: Host

[0024] 400: Display interface

[0025] 110: Controller (SoC)

[0026] 120: Display status control circuit

[0027] 121: Switch

[0028] 122: Storage Circuit

[0029] 123: AND gate

[0030] 124: OR gate

[0031] ND1, ND2: Endpoints

[0032] S210, S220, S230, S240, S250: Process steps of the display state control method DETAILED DESCRIPTION

[0033] Please refer to Figure 1, the electronic device 100 is coupled to the host 300. The electronic device 100 includes: a controller 110 and a display state control circuit 120. The controller 110 is, for example, a system on chip (SoC), a microprocessor, or other programmable processing unit (Microprocessor), a digital signal processor (DSP), a programmable controller, an application specific integrated circuit (ASIC), a programmable logic device (PLD) or other similar devices. The controller 110 is coupled to the display state control circuit 120. The display state control circuit 120 includes: a switch 121, a storage circuit 122, an AND gate 123 and an OR gate 124. In addition, the display state control circuit 120 further includes a first terminal ND1 and a second terminal ND2. The first terminal ND1 and the second terminal ND2 are coupled to a display interface circuit 400 for providing the physical display 200 with access to the host 300. In another embodiment, the electronic device 100 may also be integrated into the host 300 .

[0034] The host 300 is, for example, a computer host, which includes a processor, a memory, and a storage device. The electronic device 100 may be, for example, a display card or a display chip circuit module installed on the host 300. The display interface circuit 400 is, for example, a display connection terminal that supports digital video interface standards such as High Definition Multimedia Interface (HDMI) or DisplayPort (DP). In the following embodiments, for the convenience of explanation, HDMI will be used as the display interface circuit 400.

[0035] The first terminal ND1 is used to receive the first sensing signal HPD1; the second terminal ND2 is used to receive the first data DDC1. The first sensing signal HPD1 is, for example, a hot plug detection signal (Hot Plug Detection, HPD) or other sensing signals that change by sensing whether the physical display 200 is connected to the display interface circuit 400. For example, when the physical display 200 is connected to the display interface circuit 400 (for example, the video connection line of the physical display 200 is inserted into the display interface circuit 400), the value of the first sensing signal HPD1 is a first value, such as 1; when the physical display 200 is not connected (disconnected) to the display interface circuit 400, the value of the first sensing signal HPD1 is a second value, such as 0.

[0036] The first data DDC1 is, for example, the extended display identification data (EDID) of the display 200 transmitted by the display data channel (Display Data Channel) of the HDMI interface. In another embodiment, when the display interface circuit 400 is a DP interface, the first data is the extended display identification data transmitted by the display 200 via the auxiliary channel (AUX channel) of the DP interface. The extended display identification data includes information such as various resolutions, manufacturer name, serial number, and various display parameters of the display 200.

[0037] The switch 121 is coupled to the controller 110, the first terminal ND1 and the second terminal ND2. The storage circuit 122 is coupled to the switch 121 to store the second data DDC2. The storage circuit 122 is, for example, a suitable storage circuit such as a read-only memory (ROM), a programmable ROM (PROM), an erasable programmable read only memory (EPROM), etc. The second data DDC2 is the screen identification data (EDID) of the virtual display. In other words, the second data DDC2 stored in the storage circuit 122 includes the extended display identification data of a virtual / fictitious display. When the extended display identification data of the virtual display is transmitted to the host 300, the processor (or operating system) of the host 300 determines that the display currently connected to the host 300 / display interface 400 is the virtual display corresponding to the second data DDC2, and identifies the information of the connected display according to the second data DDC2, such as the manufacturer name, serial number, various display parameters, etc.

[0038] Please refer to Figure 2 In step S210, the controller 110 transmits the first control signal C1 and the second control signal C2 to the display state control circuit 120. Specifically, the first control signal C1 is input to the first input terminal of the OR gate 124, and the second control signal C2 is input to the first input terminal of the AND gate 123.

[0039] Next, in step S220 , the display state control circuit 120 generates a second sensing signal HPD2 according to the second control signal C2 received from the controller 110 and the first sensing signal HPD1 received from the first terminal.

[0040] Specifically, when the physical display 200 is connected, the first sensing signal HPD1 received by the first terminal ND1 is a first value (e.g., 1), and the first sensing signal HPD1 is input to the second input terminal of the AND gate 123 and the control terminal of the switch 121. In addition, the first data DDC1 is input from the physical display 200 to the first input terminal of the switch 121, wherein the first data DDC1 includes the screen identification data of the physical display. On the contrary, when no physical display 200 is connected, the first sensing signal HPD1 received by the first terminal ND1 is a second value (e.g., 0), and the first input terminal of the switch 121 does not receive any first data. It is worth mentioning that the second input terminal of the switch 121 is used to receive the second data DDC2 from the storage circuit 122.

[0041] The AND gate 123 performs an AND logic operation according to the received second control signal C2 and the first sensing signal HPD1 received from the first terminal to generate and output the second sensing signal HPD2 (see FIG. 1 for detailed output results). Figure 3 The second sensing signal HPD2 is input to the second input terminal of the OR gate 124.

[0042] Next, in step S230, the display state control circuit 120 generates a third sensing signal HPD3 according to the first control signal C1 and the second sensing signal HPD2 received from the controller 110. Specifically, the OR gate 124 performs an OR logic operation according to the received first control signal C1 and the second sensing signal HPD2 to generate and output the third sensing signal HPD3 (see FIG. 1 for detailed output results). Figure 3 ). The third sensing signal HPD3 is input to the first input terminal of the controller 110 .

[0043] Furthermore, in step S240 , the display state control circuit 120 switches the output state of the switch 121 according to the first sensing signal HPD1 to output the first data DDC1 as the third data DDC3 to the controller 110 , or outputs the second data DDC2 received from the storage circuit 122 as the third data DDC3 to the controller 110 .

[0044] Specifically, the output state of the switch includes a first output state and a second output state.

[0045] In response to receiving the first sensing signal HPD1 of the first value (1), the switch 121 is switched to the first output state, and the switch 121 outputs the received first data DDC1 as the third data DDC3 to the controller 110. That is, the switch 121 in the first output state conducts a path between the second terminal ND2 and the second input terminal of the controller 110 for receiving the third data DDC3, and disconnects a path between the storage circuit 122 and the second input terminal of the controller 110.

[0046] On the contrary, in response to receiving the first sensing signal HPD1 of the second value (0), the switch 121 is switched to the second output state, and the second data DDC2 is output as the third data DDC3 to the controller 110. That is, the switch 121 of the second output state disconnects the path between the second terminal ND2 and the second input terminal of the controller 110, and connects the path between the storage circuit 122 and the second input terminal of the controller 110 (the output result of the third data DDC3 can be seen in FIG. Figure 3 ).

[0047] Finally, in step S250, the display state control circuit 120 outputs the third sensing signal HPD3 and the third data DDC3 to the controller 110. In this embodiment, the controller 110 can determine whether a display is currently connected and the relevant information (EDID) of the connected display according to the received third sensing signal HPD3 and the third data DDC3, and notify the host 300.

[0048] In this embodiment, the controller 110 is used to transmit the first control signal C1 and the second control signal C2 to instruct the display state control circuit 120 to switch the display state of the host 300 to a normal state, a forced disconnection state or a forced connection state, wherein the display state control circuit 120 outputs the third sensing signal HPD3 and the third data DDC3 to the controller to complete the operation of switching the display state of the host 300 to a normal state, a forced disconnection state or a forced connection state.

[0049] The normal state means that the changes in the display state recognized by the host 300 (or its operating system) and the related information received about the connected display are normally determined according to whether the display 200 is actually connected to the display interface 400 .

[0050] The forced disconnection state means that the display state identified by the host 300 (or its operating system) is the state of no display connected. That is, regardless of whether there is actually a display 200 connected to the display interface 400, the host 300 will think that no display is currently connected, and naturally will not identify the third data DDC3.

[0051] The mandatory access state means that the display state identified by the host 300 (or its operating system) is the display connected state. That is, regardless of whether there is actually a physical display 200 connected to the display interface 400, the host 300 will assume that a display is currently connected and identify the received third data DDC3 as the relevant information (EDID) of the connected display.

[0052] For more details, see Figure 3 , the controller 110 transmits a first control signal C1 of a second value (0) and a second control signal C2 of a first value (1) to the display state control circuit 120 to indicate to switch the display state of the host 300 to a normal state. In the normal state operation, when the physical display 200 is connected to the electronic device 100, the first sensing signal HPD1 is the first value (1), the generated second sensing signal HPD2 is the first value (1), and the generated third sensing signal is the first value (1), wherein the third sensing signal HPD3 of the first value (1) is used to inform that a display is being connected to the host 300, and the third data DDC is used to indicate the screen identification data of the connected physical display 200. Conversely, when no physical display is connected to the electronic device 100, the first sensing signal HPD1 is the second value (0), the generated second sensing signal HPD2 is the second value (0), and the generated third sensing signal HPD3 is the second value (0), wherein the third sensing signal HPD3 of the second value (0) is used to inform that no display is being connected to the host 300.

[0053] On the other hand, the controller 110 transmits the first control signal C1 of the second value (0) and the second control signal C2 of the second value (0) to the display state control circuit 120 to instruct to switch the display state of the host 300 to the forced disconnection state. In the operation of the forced disconnection state, when the physical display 200 is connected to the electronic device 100, the first sensing signal HPD1 is the first value (1), the generated second sensing signal HPD2 is the second value (0), and the generated third sensing signal HPD3 is the second value (0), wherein the third sensing signal HPD3 of the second value (0) is used to inform that no display is connected to the host 300. Conversely, when no physical display is connected to the electronic device 100, the first sensing signal HPD1 is the second value (0), the generated second sensing signal HPD2 is the second value (0), and the generated third sensing signal HPD3 is the second value (0). The third sensing signal HPD3 of the second value (0) is used to inform that no display is connected to the host 300.

[0054] On the other hand, the controller transmits a first control signal C1 of a first value (1) to the display state control circuit 120 to instruct to switch the display state of the host 300 to a forced access state. When the physical display 200 is connected to the electronic device 100, the first sensing signal HPD1 is a first value (1), and the generated third sensing signal HPD3 is a first value (1), wherein the third sensing signal HPD3 of a first value (1) is used to inform that a display is being connected to the host 300, and the third data DDC3 is used to indicate the screen identification data of the connected physical display. Conversely, when no physical display is connected to the electronic device 100, the first sensing signal HPD1 is a second value (0), and the generated third sensing signal HPD3 is a first value (1), wherein the third sensing signal of a first value (1) is used to inform that the display is being connected to the host 300 (the connected display being informed is actually a virtual display), and the third data DDC3 is used to indicate the screen identification data of the connected display.

[0055] In this embodiment, the specific values ​​of the first control signal C1 and the second control signal C2 sent by the controller 110 can be determined by a specific application installed in the host 300. For example, the user can select the display state to be implemented currently through the specific application installed in the operating system of the host 300. If the selected display state is a normal state, a forced disconnection state, or a forced connection state, the specific application can instruct the controller 110 to send the corresponding first control signal C1 and second control signal C2.

[0056] In another embodiment, a specific application can further set a time period for switching to different states. For example, when a user switches to a forced disconnect state via a specific application, the display state will be restored to the state before the switch after a corresponding set time period has passed.

[0057] In yet another embodiment, the specific values ​​of the first control signal C1 and the second control signal C2 sent by the controller 110 can be added to a specific software / firmware program by writing program codes, so that the display state is switched when the specific software / firmware program is executed. In addition, a time period or trigger condition can also be set so that when the execution of the specific software / firmware program is completed, the display state is restored to the state before the switch.

[0058] On the other hand, the user can also control the first control signal C1 and the second control signal C2 sent by the controller 300 through a remote server or an external electronic device. In this way, the display state of the host 300 can be smoothly switched without relying on the display to display information.

[0059] In one embodiment, the display state control circuit 120 may also be implemented as a program code module to output / control the third sensing signal HPD3 and the third data DDC3 to the controller 110 .

[0060] Based on the above, the present invention provides an electronic device and a display status control method used therein, which have the following significant technical benefits: (1) Convenient display control: The method allows the user to make settings to control the connected or disconnected state of the display without actually plugging in or unplugging the display. This greatly enhances flexibility and convenience, especially in situations where it is difficult to directly change the connection between the display cable and the display interface; (2) Virtual display simulation: In situations where no physical display is connected, the method can simulate a virtual display. This provides an effective solution for those specific applications or environments that require a display to be connected to operate normally, but do not really need an actual display. In summary, the present invention not only greatly improves the flexibility of use of electronic devices, but also solves some limitations and problems in traditional designs and provides more operating options and possibilities.

Claims

1. An electronic device coupled to a host, characterized in that: include: a display status control circuit; as well as a controller coupled to the display state control circuit, The display state control circuit comprises: A first terminal, used for receiving a first sensing signal; A second endpoint, used for receiving a first data; a switch coupled to the controller, the first terminal, and the second terminal, wherein the first terminal and the second terminal are coupled to a display interface circuit for providing a physical display connected to the host, wherein the first sensing signal varies depending on whether the physical display is connected to the display interface circuit; and a storage circuit, coupled to the switch, for storing a second data, The controller transmits a first control signal and a second control signal to the display state control circuit. wherein the display state control circuit generates a second sensing signal according to the second control signal received from the controller and the first sensing signal received from the first endpoint, wherein the display state control circuit generates a third sensing signal according to the first control signal received from the controller and the second sensing signal, wherein the display state control circuit switches the output state of the switch according to the first sensing signal to output the first data as a third data to the controller, or outputs the second data received from the storage circuit as the third data to the controller, The display state control circuit outputs the third sensing signal and the third data to the controller.

2. The electronic device according to claim 1, wherein: The second data is screen identification data of a virtual display.

3. The electronic device according to claim 1, wherein: When a physical display is connected, the first sensing signal received by the first endpoint is a first value, the first sensing signal is input to the switch, and the first data is input from the physical display to the switch, wherein the first data includes screen identification data of the physical display, wherein when no physical display is connected, the first sensing signal received by the first endpoint is a second value.

4. The electronic device as claimed in claim 3, characterized in that: The output state of the switch includes a first output state and a second output state, In response to receiving a first sensing signal of a first value, the switch is switched to a first output state, and the first data is output to the controller as the third data, In response to receiving a first sensing signal of a second value, the switch is switched to a second output state, and the second data is output to the controller as the third data.

5. The electronic device as claimed in claim 4, characterized in that: The display state control circuit further comprises: an AND gate, coupled to the first terminal and the controller, for receiving the first sensing signal and the second control signal; and an OR gate, coupled to the AND gate and the controller, for receiving the second sensing signal and the first control signal, The AND gate generates the second sensing signal according to the first sensing signal and the second control signal inputted thereto. The OR gate generates the third sensing signal according to the input second sensing signal and the first control signal.

6. The electronic device as claimed in claim 4, characterized in that: The controller is used to transmit the first control signal and the second control signal to instruct the display state control circuit to switch the display state of the host to a normal state, a forced disconnection state or a forced connection state, wherein the display state control circuit outputs the third sensing signal and the third data to the controller to complete the operation of switching the display state of the host to the normal state, the forced disconnection state or the forced connection state.

7. The electronic device according to claim 6, wherein: The controller transmits the first control signal of the second value and the second control signal of the first value to the display state control circuit to instruct to switch the display state of the host to the normal state, wherein the controller transmits the first control signal of the second value and the second control signal of the second value to the display state control circuit to instruct to switch the display state of the host to the forced disconnection state, The controller transmits the first control signal of a first value to the display state control circuit to instruct to switch the display state of the host to the forced access state.

8. The electronic device as claimed in claim 7, characterized in that: The controller transmits the first control signal of the second value and the second control signal of the first value to the display state control circuit to instruct to switch the display state of the host to the normal state, and the operation includes: When a physical display is connected to the electronic device, the first sensing signal is a first value, the generated second sensing signal is a first value, and the generated third sensing signal is a first value, wherein the third sensing signal of the first value is used to inform that a display is connected to the host, and the third data is used to indicate screen identification data of the connected physical display, When no physical display is connected to the electronic device, the first sensing signal is a second value, the second sensing signal generated is a second value, and the third sensing signal generated is a second value, wherein the third sensing signal of the second value is used to inform that no display is being connected to the host.

9. The electronic device as claimed in claim 7, characterized in that: The controller transmits the first control signal of the second value and the second control signal of the second value to the display state control circuit to instruct to switch the display state of the host to the forced disconnection state. The operation includes: When a physical display is connected to the electronic device, the first sensing signal is a first value, the generated second sensing signal is a second value, and the generated third sensing signal is a second value, wherein the third sensing signal of the second value is used to inform that no display is connected to the host, When no physical display is connected to the electronic device, the first sensing signal is a second value, the second sensing signal generated is a second value, and the third sensing signal generated is a second value, wherein the third sensing signal of the second value is used to inform that no display is being connected to the host.

10. The electronic device as claimed in claim 7, wherein: The controller transmits the first control signal of the first value to the display state control circuit to instruct the operation of switching the display state of the host to the forced access state, including: When a physical display is connected to the electronic device, the first sensing signal is a first value, and the generated third sensing signal is a first value, wherein the third sensing signal of the first value is used to inform that a display is connected to the host, and the third data is used to indicate the screen identification data of the connected physical display, When no physical display is connected to the electronic device, the first sensing signal is a second value, and the generated third sensing signal is a first value, wherein the third sensing signal of the first value is used to inform that a virtual display is being connected to the host, and the third data is used to indicate screen identification data of the connected virtual display.

11. A display state control method, applicable to an electronic device, characterized in that: The electronic device is coupled to a host, and the electronic device includes a display state control circuit; and a controller, wherein the controller is coupled to the display state control circuit, and the display state control circuit is coupled to a display interface circuit for providing a physical display access to the host, the method comprising: Transmitting a first control signal and a second control signal to the display state control circuit via the controller; generating a second sensing signal via the display state control circuit according to the second control signal received from the controller and the first sensing signal received from the first terminal of the display state control circuit, wherein the first sensing signal varies depending on whether the physical display is connected to the display interface circuit; generating a third sensing signal via the display state control circuit according to the first control signal and the second sensing signal received from the controller; By means of the display state control circuit, an output state of a switch of the display state control circuit is switched according to the first sensing signal, so as to output the first data received from the second terminal of the display state control circuit as a third data to the controller, or to output the second data received from the storage circuit of the display state control circuit as the third data to the controller; and The third sensing signal and the third data are output to the controller via the display state control circuit.

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