Electronic device and display state control method used thereby

Abstract

An electronic device and a display state control method used for the same. The method includes transmitting a first control signal and a second control signal, generating a second sensing signal according to the received second control signal and a first sensing signal that varies according to whether a physical display is connected to a display interface circuit, generating a third sensing signal according to the received first control signal and the second sensing signal, switching an output state of a switch of the electronic device according to the first sensing signal to output received first data as third data or output second data received from a storage circuit as the third data, and outputting the third sensing signal and the third data.

Description

TECHNICAL FIELD

[0001] The present application relates to an electronic device, and more particularly to an electronic device for controlling a display state. BACKGROUND

[0002] Conventionally, a computer host is usually equipped with a display. When a user needs to change the connection state of the display, it has to be done manually, for example, by plugging or unplugging the connection cable of the display or directly turning off the power of the screen. However, this design has some significant limitations and problems.

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

[0004] In summary, the conventional design and use of computer hosts and displays have some difficulties and challenges, especially in specific working environments or demand situations. SUMMARY

[0005] An embodiment of the present application provides an electronic device coupled to a host. The electronic device comprises a display state control circuit and a controller. The controller is coupled to the display state control circuit. The display state control circuit comprises a first terminal for receiving a first sensing signal, a second terminal 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 to access the host, wherein the first sensing signal varies with whether the physical display accesses 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 the second control signal received from the controller and the first sensing signal received from the first terminal. 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. 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 output 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.

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

[0007] In an embodiment of the present application, the second data is virtual extended display identification data (EDID) of the display.

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

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

[0010] In an embodiment of the present application, the display state control circuit further comprises an AND gate coupled to the first end point 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, wherein the AND gate generates the second sensing signal according to the inputted first sensing signal and the second control signal, and the OR gate generates the third sensing signal according to the inputted second sensing signal and the first control signal.

[0011] In an embodiment of the present application, the controller transmits the first control signal and the second control signal to the display state control circuit to instruct the display state control circuit to switch the display state of the host to a normal state, a forced disconnect state or a forced access 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 disconnect state or the forced access state.

[0012] In an embodiment of the present application, 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 disconnect state, wherein the controller transmits the first control signal of the first value to the display state control circuit to instruct to switch the display state of the host to the forced access state.

[0013] In an embodiment of the present application, the operation of the controller transmitting 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 comprises that when a physical display is accessed to the electronic device, the first sensing signal is the first value, the generated second sensing signal is the first value, and the generated third sensing signal is the first value, wherein the third sensing signal of the first value is used to inform that a display is being accessed to the host, and the third data is used to indicate the screen identification data of the accessed physical display, wherein when no physical display is accessed 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, wherein the third sensing signal of the second value is used to inform that no display is being accessed to the host.

[0014] In an embodiment of the present application, the operation of the controller transmitting the first control signal to the display status control circuit as the first value to instruct the display status of the host to be switched to the forced disconnect state includes: when a 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 as the second value is used to indicate 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 an embodiment of the present application, the operation of the controller transmitting the first control signal to the display status control circuit as the first value to instruct the display status of the host to be switched to the forced disconnect state includes: when a 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 as the second value is used to indicate 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.

[0016] Based on the above, the present application provides an electronic device and a display status control method used thereby, which have the following significant technical utilities: (1) Convenient display control: the method allows the user to set to control the connection or disconnection state of the display without the need to actually plug or unplug the display. This greatly enhances flexibility and convenience, especially in situations where it is difficult to directly change the connection of the display connection line to the display interface; (2) Virtual display simulation: in the case 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 display connection to function normally, but do not actually require an actual display. In summary, the present application not only greatly improves the flexibility of use of the electronic device, but also solves some limitations and problems in traditional designs, and provides more operation options and possibilities. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a block schematic diagram of an electronic device according to an embodiment of the present application.

[0018] Figure 2is a flowchart of operation 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] In the drawings:

[0021] 100: electronic device

[0022] 200: display

[0023] 300: host

[0024] 400: display interface

[0025] 110: controller (SoC)

[0026] 120: display state control circuit

[0027] 121: switch

[0028] 122: storage circuit

[0029] 123: AND gate

[0030] 124: OR gate

[0031] ND1, ND2: end point

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

[0033] Reference is made to Figure 1, the electronic device 100 is coupled to a host 300. The electronic device 100 includes a controller 110 and a display status control circuit 120. The controller 110 is, for example, a system on chip (SoC), a micro-processor, 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 device. The controller 110 is coupled to the display status control circuit 120. The display status control circuit 120 includes a switch 121, a storage circuit 122, an AND gate 123, and an OR gate 124. In addition, the display status control circuit 120 further includes a first end point ND1 and a second end point ND2. The first end point ND1 and the second end point ND2 are coupled to a display interface circuit 400 for providing access of the physical display 200 to the host 300. In another embodiment, the electronic device 100 can also be integrated into the host 300.

[0034] The host 300 is, for example, a computer host including a processor, a memory bank, and a storage device. The electronic device 100 can 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 connector supporting a digital video interface standard such as a high definition multimedia interface (HDMI) or a display port (DP). In the following embodiments, for the convenience of description, the HDMI will be taken as the display interface circuit 400.

[0035] The first end point ND1 is configured to receive a first sensing signal HPD1, and the second end point ND2 is configured to receive a first data DDC1. The first sensing signal HPD1 is, for example, a hot plug detection (HPD) signal or other sensing signal that changes when the physical display 200 is accessed to the display interface circuit 400. For example, when the physical display 200 is accessed to the display interface circuit 400 (for example, a video connection line of the physical display 200 is inserted into the display interface circuit 400), the first sensing signal HPD1 has a first value, such as 1. When the physical display 200 is not accessed (disconnected) to the display interface circuit 400, the first sensing signal HPD1 has 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 200 via the 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 of the DP interface. The extended display identification data includes various resolutions, manufacturer name, serial number, various display parameters, and the like of the display 200.

[0037] The switch 121 is coupled to the controller 110, the first endpoint ND1, and the second endpoint ND2. The storage circuit 122 is coupled to the switch 121 and is used to store the second data DDC2. The storage circuit 122 is, for example, a read-only memory (ROM), a programmable ROM (PROM), an erasable programmable ROM (EPROM), or the like. The second data DDC2 is the screen identification data (EDID) of a virtual display. That is, the second data DDC2 stored in the storage circuit 122 includes the extended display identification data of a virtual / conceived 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, such as the manufacturer name, serial number, various display parameters, and the like, according to the second data DDC2.

[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 the 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 endpoint.

[0040] In detail, when a physical display 200 is connected, the first sensing signal HPD1 received by the first endpoint 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 to the first input terminal of the switch 121 from the physical display 200, wherein the first data DDC1 includes 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 endpoint 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 endpoint, to generate and output a second sensing signal HPD2 (see Figure 3 for details of the output result). The second sensing signal HPD2 is input to the second input terminal of the OR gate 124.

[0042] Then, in step S230, the display state control circuit 120 generates a third sensing signal HPD3 according to the first control signal C1 received from the controller 110 and the second sensing signal HPD2. In detail, 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 Figure 3 for details of the output result). The third sensing signal HPD3 is input to the first input terminal of the controller 110.

[0043] In addition, 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 output the second data DDC2 received from the storage circuit 122 as the third data DDC3 to the controller 110.

[0044] In detail, 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 as 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 turns on the path between the second end point ND2 and the second input end of the controller 110 for receiving the third data DDC3, and turns off the path between the storage circuit 122 and the second input end of the controller 110.

[0046] Conversely, in response to receiving the first sensing signal HPD1 as the second value (0), the switch 121 is switched to the second output state, and the second data DDC2 is outputted as the third data DDC3 to the controller 110. That is, the switch 121 in the second output state turns off the path between the second end point ND2 and the second input end of the controller 110, and turns on the path between the storage circuit 122 and the second input end of the controller 110 (the output result of the third data DDC3 can be referred to 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 the present embodiment, the controller 110 can determine whether there is a display currently connected and the related information (EDID) of the connected display according to the received third sensing signal HPD3 and the third data DDC3, and informs the host 300.

[0048] In the present 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 disconnect state or a forced connect 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 the normal state, the forced disconnect state or the forced connect state.

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

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

[0051] The forced access state means that the display state recognized by the host 300 (or its operating system) is always the state that a display is connected. That is, whether there is actually a physical display 200 connected to the display interface 400 or not, the host 300 will consider that a display is connected at present and identify the received third data DDC3 as the relevant information (EDID) of the connected display.

[0052] In more detail, please refer to Figure 3 , the controller 110 transmits the first control signal C1 as the second value (0) and the second control signal C2 as the first value (1) to the display state control circuit 120 to indicate to switch the display state of the host 300 to the normal state. In the operation of the normal 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 first value (1), and the generated third sensing signal is the first value (1), wherein the third sensing signal HPD3 with 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 with 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 as the second value (0) and the second control signal C2 as the second value (0) to the display state control circuit 120 to indicate to switch the display state of the host 300 to the forced disconnect state. In the operation of the forced disconnect 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 with the second value (0) is used to inform that no display is being 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 with the second value (0) is used to inform that no display is being connected to the host 300.

[0054] In yet another aspect, the controller transmits the first control signal C1 to the display state control circuit 120 as a first value (1) to instruct the display state of the host 300 to be switched to the forced access state. When the physical display 200 is connected to the electronic device 100, the first sensing signal HPD1 is the first value (1), and the generated third sensing signal HPD3 is the first value (1), in which the third sensing signal HPD3 of the first value (1) is used to inform that a display is connected to the host 300, and the third data DDC3 is used to indicate the screen identification data of the connected physical display. On the contrary, when no physical display is connected to the electronic device 100, the first sensing signal HPD1 is the second value (0), and the generated third sensing signal HPD3 is the first value (1), in which the third sensing signal of the first value (1) is used to inform that a display is connected to the host 300 (the informed connected display is actually a virtual display), and the third data DDC3 is used to indicate the screen identification data of the connected display.

[0055] In the present embodiment, the specific values of the first control signal C1 and the second control signal C2 transmitted by the controller 110 can be determined by a specific application installed in the host 300. For example, a user can select a display state to be implemented at present via a specific application installed in the operating system of the host 300. If the selected display state is the normal state, the forced disconnection state or the forced access state, the specific application can instruct the controller 110 to transmit the corresponding first control signal C1 and the second control signal C2.

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

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

[0058] On the other hand, a user can also control the first control signal C1 and the second control signal C2 transmitted 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 status control circuit 120 can 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 application provides an electronic device and a display status control method used thereby, which has the following significant technical utilities: (1) Convenient display control: the method allows the user to set to control the access or disconnection state of the display without actually plugging in the display. This greatly enhances flexibility and convenience, especially in situations where it is difficult to directly change the connection of the display connection line to the display interface; (2) Virtual display simulation: in the absence of a physical display being connected, the method can simulate a virtual display. This provides an effective solution for those specific applications or environments that require display access to function properly, but do not actually require a physical display. In summary, the present application not only greatly improves the flexibility of the electronic device, but also solves some limitations and problems in traditional designs, and provides more operation options and possibilities.

Claims

1. An electronic device coupled to a host computer, characterized in that, include: A display status control circuit; as well as A controller is coupled to the display status control circuit. The display status control circuit includes: A first endpoint for receiving a first sensing signal; A second endpoint is used to receive a first piece of data; A switch, coupled to the controller, the first endpoint, and the second endpoint, wherein the first endpoint and the second endpoint are coupled to a display interface circuit for providing physical display access to 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, is used to store a second piece of data. The controller transmits a first control signal and a second control signal to the display status control circuit. The display state control circuit generates a second sensing signal based on the second control signal received from the controller and the first sensing signal received from the first endpoint, and the display state control circuit generates a third sensing signal based on the first control signal received from the controller and the second sensing signal. The display state control circuit switches the output state of the switch according to the first sensing signal, so as to output the first data as a third data to the controller, or output the second data received from the storage circuit as the third data to the controller. The display status control circuit outputs the third sensing signal and the third data to the controller.

2. The electronic device as claimed in claim 1, characterized in that, The second data is screen recognition data of a virtual display.

3. The electronic device as claimed in claim 1, characterized in that, 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 the screen recognition 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 a first sensing signal receiving 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 a first sensing signal that is received as 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 status control circuit further includes: An AND gate, coupled to the first endpoint and the controller, is used to receive the first sensing signal and the second control signal; and An OR gate, coupled to the AND gate and the controller, is used to receive the second sensing signal and the first control signal. The AND gate generates the second sensing signal based on the input first sensing signal and the second control signal. The OR gate generates the third sensing signal based on 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 disconnect state, or a forced access 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 disconnect state, or the forced access state.

7. The electronic device as claimed in claim 6, characterized in that, The controller transmits a first control signal of a second value and a second control signal of a first value to the display status control circuit to instruct it to switch the display status of the host to the normal state. The controller transmits a first control signal of a second value and a second control signal of a second value to the display state control circuit to instruct it to switch the display state of the host to the forced disconnect state. The controller transmits the first control signal of the first value to the display state control circuit to instruct the host 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 status control circuit to instruct the operation of switching the display status of the host to the normal state, including: 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 with the first value is used to indicate that a display is being connected to the host, and the third data is used to indicate the screen recognition 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 generated second sensing signal is a second value, and the generated third sensing signal is a second value, wherein the third sensing signal with the second value is used to indicate 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 the operation of switching the display state of the host to the forced disconnect state, including: When a physical display is connected to the electronic device, the first sensing signal has a first value, the generated second sensing signal has a second value, and the generated third sensing signal has a second value, wherein the third sensing signal having a second value indicates that no display is being connected to the host. 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 with the second value is used to indicate that no display is being connected to the host.

10. The electronic device as claimed in claim 7, characterized in that, The controller transmits the first control signal, which is 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 also a first value. The third sensing signal with the first value is used to indicate that a display is being connected to the host, and the third data is used to indicate the screen recognition 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. The third sensing signal with the first value is used to indicate that a virtual display is being connected to the host, and the third data is used to indicate the screen recognition 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 computer, and the electronic device includes display status control circuitry. The method includes: a controller coupled to the display state control circuitry, and the display state control circuitry coupled to a display interface circuitry for providing physical display access to the host. A first control signal and a second control signal are transmitted to the display status control circuit via the controller; A second sensing signal is generated via the display state control circuit based on 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 changes depending on whether the physical display is connected to the display interface circuit. A third sensing signal is generated via the display status control circuit based on the first control signal and the second sensing signal received from the controller; The display state control circuit switches the output state of its switch according to the first sensing signal, so that first data received from the second terminal of the display state control circuit is output to the controller as third data, or second data received from the storage circuit of the display state control circuit is output to the controller as the third data; and The third sensing signal and the third data are output to the controller via the display status control circuit.

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