Information processing device and control method

Abstract

To provide an information processing device capable of causing a built-in display to easily function as an external monitor by connecting it via a wired connection.SOLUTION: An information processing device comprises: a display unit; a first processor which executes display processing to generate a video signal displayed on a display unit on the basis of system processing; a second processor which can execute processing independently of an operation state of the first processor; a connection unit to which a cable for transmitting input / output signals, including video signals, to and from an external device is connected; a first selection unit which selects either a first path for transmitting the video signal generated by display processing of the first processor to the display unit or a second path for transmitting a video signal input to the connection section to the display unit by control of the second processor; and a second selection unit which selects, by the control of the second processor, either a third path for transmitting a control signal, which the first processor uses to control the display unit, to the display unit or a fourth path for transmitting a control signal, which the second processor uses to control the display unit, to the display unit.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an information processing device and a control method. [Background technology]

[0002] A personal computer with a built-in display can be connected to an external monitor (external display) to display a duplicate screen or to expand the screen area of ​​the built-in display. A personal computer and an external monitor can be connected using a cable or wirelessly without a cable (for example, Patent Document 1). In recent years, some personal computers allow the built-in display to be used as an external monitor for other personal computers. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-050873 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, wireless connection methods are subject to delays and other factors, making image display quality less than that of wired connections using cables. In recent years, some personal computers have been made available that are capable of HDMI (registered trademark) input, but switching between input and output requires the operation of a physical button, which is not user-friendly.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and one of its objectives is to provide an information processing device and a control method that can easily enable the built-in display to function as an external monitor by connecting it via a wired connection. [Means for solving the problem]

[0006] The present invention has been made to solve the above-mentioned problems, and an information processing device according to a first aspect of the present invention comprises a display unit, a memory for storing a system program, a first processor for executing system processing based on the program stored in the memory and for executing display processing for generating a video signal to be displayed on the display unit based on the system processing, a second processor capable of executing processing regardless of the operating state of the first processor, a connection unit to which a cable for transmitting input / output signals including a video signal to an external device is connected, a first selection unit for selecting, under the control of the second processor, either a first path for transmitting a video signal generated by the display processing by the first processor to the display unit or a second path for transmitting a video signal input to the connection unit to the display unit, and a second selection unit for selecting, under the control of the second processor, either a third path for transmitting a control signal by the first processor to the display unit to the display unit, or a fourth path for transmitting a control signal by the second processor to the display unit to control the display unit.

[0007] In the above-mentioned information processing device, the second processor may, in a first mode, control the first selection unit to select the first path and the second selection unit to select the third path, and, in a second mode, control the first selection unit to select the second path and the second selection unit to select the fourth path.

[0008] The above information processing device may further include a third selection unit that selects, under the control of the second processor, either a fifth path that transmits a video signal generated by the display processing by the first processor to the connection unit or a sixth path among the second paths that transmits a video signal input to the connection unit to the first selection unit, and the second processor may control the third selection unit to select the sixth path in the second mode.

[0009] In the above information processing device, the second processor may control the system executed by the first processor to be in an active state in the first mode, and may control the system executed by the first processor to be in a shut down state in the second mode.

[0010] In the information processing device, the second processor may control the information processing device to the second mode when the cable is connected to the connection unit in the first mode.

[0011] In the information processing device, the second processor may control the information processing device to the first mode when the cable connected to the connection unit in the second mode becomes disconnected.

[0012] In the information processing device, the second processor may perform control to the second mode when a system executed by the first processor in the first mode is shut down.

[0013] In the information processing device, the second processor may be controlled to switch to the first mode in response to activation of a system executed by the first processor in the second mode.

[0014] The above-mentioned information processing device may further include a power supply control unit that controls a power supply direction to an external device connected to the connection unit via the cable, and the second processor may control the power supply control unit in the second mode so that power is supplied from the external device via the connection unit.

[0015] According to a second aspect of the present invention, a control method for an information processing device including a display unit, a first processor that executes system processing and executes display processing to generate a video signal to be displayed on the display unit based on the system processing, a second processor that is capable of executing processing regardless of the operating state of the first processor, a connection unit to which a cable that transmits input / output signals including a video signal to an external device is connected, a first selection unit that selects either a first path that transmits a video signal generated by the display processing by the first processor to the display unit or a second path that transmits a video signal input to the connection unit to the display unit, and a second selection unit that selects either a third path that transmits a control signal that controls the display unit by the first processor to the display unit, or a fourth path that transmits a control signal that controls the display unit by the second processor to the display unit, includes a step of the second processor controlling the first selection unit to select the first path and the second selection unit to select the third path in a first mode, and a step of controlling the first selection unit to select the second path and the second selection unit to select the fourth path in a second mode. Effect of the Invention

[0016] According to the above-described aspects of the present invention, the information processing device can easily cause the built-in display to function as an external monitor by being connected via a wire. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a diagram illustrating an overview of an information processing apparatus according to a first embodiment. [Diagram 2] FIG. 1 is a schematic block diagram showing an example of a main hardware configuration of an information processing device according to a first embodiment. [Diagram 3] FIG. 2 is a schematic block diagram showing an example of a configuration related to an external monitor function according to the first embodiment. [Figure 4] 6 is a flowchart showing an example of an EM mode start process according to the first embodiment. [Diagram 5]6 is a flowchart showing an example of an EM mode ending process according to the first embodiment. [Figure 6] 10 is a flowchart showing an example of an EM mode start process according to the second embodiment. [Figure 7] 10 is a flowchart showing an example of an EM mode ending process according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment> First, a first embodiment of the present invention will be described. FIG. 1 is an explanatory diagram of an overview of an information processing device according to this embodiment.

[0019] PC1 is an example of an information processing device according to this embodiment, and is, for example, a notebook (clamshell) personal computer. PC1 can use a built-in display not only as a display unit when functioning as a PC, but also as an external monitor for other information processing devices.

[0020] 1, PC1A and PC1B are shown as examples of PC 1. PC1A normally executes processing as a PC, but is connected to PC1B via a USB (Universal Serial Bus) cable 5, and can cause a display unit 17 (built-in display) of PC1A to function as an external monitor for PC1B. For example, the USB cable 5 is connected to USB Type-C connectors provided on each of PC1A and PC1B, and transmits input / output signals including video signals.

[0021] At this time, when PC1A is connected to PC1B via USB cable 5, it automatically operates as an external monitor without requiring user operation. PC1B becomes the output side (source side) of DP (DisplayPort), PC1A becomes the input side (sink side) of DP, and a video signal conforming to the DP standard (hereinafter referred to as "DP signal") output from PC1B is input to PC1A via USB cable 5 and displayed on display unit 17 (built-in display) of PC1A.

[0022] The configuration of the information processing device according to this embodiment will be described in detail below. [Hardware configuration of information processing device] 2 is a schematic block diagram showing an example of a main hardware configuration of an information processing device according to this embodiment. PC1, which is an example of the information processing device shown in the figure, includes a main processing unit 10, a communication unit 15, a storage unit 16, a display unit 17, a USB connector 18, an EC (Embedded Controller) 20, an input device 30, a power button 35, and a power supply unit 40.

[0023] The main processing unit 10 is composed of a CPU (Central Processing Unit) 11, a GPU (Graphic Processing Unit) 12, a chipset 13, and a system memory 14, and is capable of executing processing of various application programs on an OS (Operating System) through system processing based on the OS.

[0024] The CPU 11 is a processor that executes processes based on BIOS programs, processes based on OS programs, processes based on application programs that run on the OS, and the like. For example, the CPU 11 executes a startup process that starts the system from a stopped state. When the system is started, the CPU 11 executes processes such as various application programs. The CPU 11 also executes a shutdown process that shuts down the system from a started state to stop operation.

[0025] The GPU 12 is connected to the display unit 17. For example, the GPU 12 executes a display process that generates a DP signal to be displayed on the display unit 17 (or an external monitor) in accordance with the processing of a program executed by the CPU 11, based on the processing of a video BIOS or the like. For example, the GPU 12 outputs the generated DP signal to the display unit 17. Furthermore, when displaying on an external monitor, the GPU 12 outputs the generated DP signal to the USB connector 18.

[0026] The chipset 13 has a function as a memory controller and a function as an I / O controller. For example, the chipset 13 controls the reading and writing of data from the system memory 14, the storage unit 16, etc. by the CPU 11 and the GPU 12. The chipset 13 also controls the input and output of data from the communication unit 15, the display unit 17, and the EC 20. The chipset 13 also controls the input and output of data to and from a device or equipment connected via a USB cable 5 connected to a USB connector 18.

[0027] The system memory 14 is used as a reading area for the programs executed by the CPU 11 and a working area for writing processing data.

[0028] The CPU 11, the GPU 12, and the chipset 13 may be configured as a single integrated processor, or some or each of them may be configured as individual processors. Also, the CPU 11, the GPU 12, the chipset 13, and the system memory 14 may be configured as an integrated SoC (System on a chip).

[0029] The communication unit 15 is communicably connected to other devices via a wireless or wired communication network, and transmits and receives various data. For example, the communication unit 15 includes a wired LAN interface such as Ethernet (registered trademark) or a wireless LAN interface such as Wi-Fi (registered trademark).

[0030] The storage unit 16 includes storage media such as a hard disk drive (HDD), a solid state drive (SSD), a RAM, a ROM, etc. The storage unit 16 stores various programs such as an OS, device drivers, and applications, as well as various data acquired by the operation of the programs.

[0031] The display unit 17 includes, for example, an LCD (Liquid Crystal Display) panel. The display unit 17 displays an image (video) based on a DP signal generated by the main processing unit 10. When functioning as an external monitor, the display unit 17 displays an image (video) based on a DP signal input via a USB connector 18. The display unit 17 is not limited to an LCD panel, and may include other display panels such as an organic EL display panel.

[0032] The USB connector 18 is an example of a connection unit for external communication for communicating with an external device or equipment using USB. For example, the USB connector 18 is a connector compatible with USB Type-C. By connecting one end of a USB cable 5 (see FIG. 1 ) to the USB connector 18, external communication with an external device or equipment to which the other end of the cable 5 is connected is possible. For example, the USB connector 18 transmits input / output signals including a DP signal by being connected via the USB cable 5.

[0033] The EC20 is a microcomputer including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and an I / O (Input / Output) logic circuit. The CPU of the EC20 reads a control program (firmware) prestored in its own ROM, and executes the read control program to fulfill its functions. The EC20 operates independently of the main processing unit 10, controls the operation of the main processing unit 10, and manages its operating state. The EC20 is also connected to an input device 30, a power button 35, a power supply unit 40, and the like.

[0034] For example, the EC 20 communicates with the power supply unit 40 to obtain information on the battery state (such as remaining capacity) from the power supply unit 40 and outputs control signals and the like to the power supply unit 40 for controlling the supply of power according to the operating state of each unit of the PC 1. The EC 20 also obtains an operation signal from the input device 30 or the power button 35 and executes processing based on the obtained operation signal.

[0035] Furthermore, the EC 20 controls the display unit 17 to function as an external monitor when the USB cable 5 (see FIG. 1) is connected to the USB connector 18. When the display unit 17 is made to function as an external monitor, the EC 20 controls the display unit 17 instead of the main processing unit 10. Details of the configuration for making the display unit 17 function as an external monitor will be described later with reference to FIG.

[0036] The input device 30 is an input unit that accepts user input. For example, the input device 30 is a keyboard, a touch pad, a track point, or the like that accepts user operation input, and outputs an operation signal indicating the operation content to the EC 20 in response to accepting the user operation. When the power button 35 is pressed by a user's power-on or power-off operation, the power button 35 outputs, to the EC 20, an operation signal indicating that the power button 35 has been pressed.

[0037] The power supply unit 40 supplies power to each part of the PC 1 according to the operating state of each part. The power supply unit 40 includes a power supply circuit such as a DC (Direct Current) / DC converter. The DC / DC converter converts the voltage of direct current power supplied from an AC (Alternate Current) / DC adapter or a battery (battery pack) into a voltage required by each part. The power whose voltage has been converted by the DC / DC converter is supplied to each part via each power supply system. For example, the power supply unit 40 supplies power to each part via each power supply system based on a control signal input from the EC 20. The power supply unit 40 also includes a battery as a built-in secondary battery and a battery charging circuit.

[0038] [External monitor function configuration] Next, a detailed description will be given of a configuration for making the display unit 17 of the PC1 function as an external monitor. Fig. 3 is a schematic block diagram showing an example of a configuration related to the external monitor function according to this embodiment. Fig. 3 shows an example of the configuration of the PC1A side when the PC1A and the PC1B are connected by the USB cable 5 as shown in Fig. 1.

[0039] The configuration of PC1B is basically the same as that of PC1A. When PC1A functions as an external monitor, PC1B functions as a normal personal computer and uses PC1A as the external monitor.

[0040] In Fig. 3, the same reference numerals are used for components corresponding to those in Fig. 2. Here, as an example of the configuration of PC1A, the main processing unit 10, display unit 17, USB connector 18, EC 20, and power supply unit 40 shown in Fig. 2, as well as the bus selector 21, bus selector 22, signal selector 23, signal selector 24, and panel power switch 45, which are related to the control when functioning as an external monitor, are shown.

[0041] The power supply unit 40 includes a power supply circuit 41, a battery 42, and a PD controller 43. The power supply circuit 41 includes a DC / DC converter and the like, and generates power by converting power supplied from the battery 42 or DC power supplied via the USB connector 18 into a voltage required by each unit and supplies the power to each unit. For example, the power supply circuit 41 generates system power to be supplied to the main processing unit 10 and the EC 20, etc., panel power to be supplied to the display unit 17, etc. The power supply circuit 41 also includes a charging circuit that controls charging of the battery 42.

[0042] The PD controller 43 supports USB PD (Power Delivery) and has a power supply function that supplies power to PC 1B via a VBUS (power line) terminal of the USB connector 18. The PD controller 43 can supply power via the VBUS terminal of the USB connector 18 by enabling the power supply function. Furthermore, when the power supply function is disabled, the PD controller 43 becomes the power receiving side and receives power supplied from PC 1B via the VBUS terminal of the USB connector 18.

[0043] Furthermore, the PD controller 43 negotiates communication with the PC 1B and communicates various information via the CC terminal of the USB connector 18. For example, the PD controller 43 sets the power supply direction, sets the transmission direction of the DP signal, receives information necessary for controlling the external monitor function, and the like, via the CC terminal of the USB connector 18. The PD controller 43 obtains information on the connection destination connected by the USB cable 5, using a Vendor Defined Message (VDM) transmitted by the CC signal.

[0044] In the configuration of PC1A shown in the figure, when the main processing unit 10 functions as a normal personal computer, it has a path for transmitting the generated DP signal to the display unit 17 (path for outputting to the built-in display) and a path for transmitting the generated DP signal to the USB connector 18 (path for outputting to an external monitor). In contrast, when PC1A functions as an external monitor, it switches to a path for transmitting the DP signal input from PC1B to the USB connector 18 to the display unit 17 (path for using the built-in display as an external monitor).

[0045] For example, as shown in the figure, the transmission path of the DP signal is provided with a bus selector 21 and a bus selector 22. The bus selector 21 selects, under the control of the EC 20, either a path for transmitting a DP signal generated by the display process by the main processing unit 10 to the display unit 17 or a path for transmitting a DP signal input to the USB connector 18 to the display unit 17.

[0046] In addition, the bus selector 22 selects, under the control of the EC 20, either a path for transmitting a DP signal generated by display processing by the main processing unit 10 to the USB connector 18, or a path for transmitting a DP signal input to the USB connector 18 to the display unit 17, among the paths for transmitting the DP signal input to the USB connector 18 to the bus selector 21.

[0047] EC20 controls whether PC1A is put into a mode in which it functions as a normal personal computer (hereinafter referred to as "PC mode") or into a mode in which PC1A functions as an external monitor (hereinafter referred to as "EM mode"). For example, EC20 is connected to bus selector 21 and bus selector 22 by a signal line for an EM mode control signal. EC20 controls bus selector 21 and bus selector 22 by controlling the EM mode control signal.

[0048] For example, when controlling to the EM mode, the EC 20 asserts the EM mode control signal (for example, controls it to "High"). When the EM mode control signal is asserted, the bus selector 21 selects a path for transmitting the DP signal input to the USB connector 18 to the display unit 17. Also, when the EM mode control signal is asserted, the bus selector 22 selects a path for transmitting the DP signal input to the USB connector 18 to the bus selector 21.

[0049] Moreover, the EC 20 is connected to the PD controller 43 via a serial bus such as I2C (I2C), and communicates with the PD controller 43 using the serial bus. For example, when controlling in the EM mode, the EC 20 communicates with the PD controller 43 to set the transmission direction of the DP signal to the input side (sink side). As a result, in the EM mode, the DP signal output from PC1B, which is the output side (source side) of the DP signal, is input to the USB connector 18 of PC1A via the USB cable 5, and the input DP signal is directly transmitted to the display unit 17 via the bus selector 21 and the bus selector 22. Hereinafter, the setting of the input side (sink side) of the DP signal is referred to as the "DP sink", and the setting of the output side (source side) of the DP signal is referred to as the "DP source". That is, when controlling in the EM mode, the EC 20 sets from the DP source to the DP sink.

[0050] On the other hand, when controlling from the EM mode to the PC mode, the EC 20 returns the setting from DP sink to DP source. When controlling to the PC mode, the EC 20 deasserts the EM mode control signal (for example, controls it to "Low"). When the EM mode control signal is deasserted, the bus selector 21 selects a path for transmitting the DP signal generated by the display processing by the main processing unit 10 to the display unit 17. When the EM mode control signal is deasserted, the bus selector 22 selects a path for transmitting the DP signal generated by the display processing by the main processing unit 10 to the USB connector 18. As a result, in the PC mode, the DP signal output from the main processing unit 10 is transmitted to the display unit 17 or an external monitor connected to the USB connector 18 via the USB cable 5.

[0051] Furthermore, when switching between the PC mode and the EM mode, the EC 20 not only controls the bus that transmits the DP signal, but also switches the control signal that controls the display unit 17. Specifically, the EC 20 switches the control signal with which the main processing unit 10 controls the display unit 17 in the PC mode, to a control signal with which the EC 20 controls the display unit 17 in the EM mode.

[0052] In the illustrated example, the signal selectors 23 and 24 select either a control signal by which the main processing unit 10 controls the display unit 17 or a control signal by which the EC 20 controls the display unit 17, based on an EM mode control signal output from the EC 20. Here, a luminance control signal (Backlight_PWM) that controls the luminance of the backlight of the display unit 17 with a PWM (Pulse Width Modulated) signal, and a panel power control signal (Panel_Power_Enable) that controls whether to enable the supply of panel power to the display unit 17 (whether to turn on the power supply) are shown as examples of control signals selected by the EM mode control signal.

[0053] The signal selector 23 selects, based on the EM mode control signal, either a path through which the main processing unit 10 transmits a brightness control signal (Backlight_PWM) for controlling the display unit 17 to the display unit 17, or a path through which the EC 20 transmits a brightness control signal (Backlight_PWM) for controlling the display unit 17 to the display unit 17.

[0054] For example, when the EC 20 asserts the EM mode control signal, the signal selector 23 selects a path for transmitting the luminance control signal (Backlight_PWM) from the EC 20 to the display unit 17. On the other hand, when the EM mode control signal is deasserted by the EC 20, the signal selector 23 selects a path for transmitting the luminance control signal (Backlight_PWM) from the main processing unit 10 to the display unit 17.

[0055] In addition, the signal selector 24 selects, based on the EM mode control signal, either a path for transmitting a panel power control signal (Panel_Power_Enable) for the main processing unit 10 to control the display unit 17 to the panel power switch 45, or a path for transmitting a panel power control signal (Panel_Power_Enable) for the EC 20 to control the display unit 17 to the panel power switch 45.

[0056] For example, when the EC 20 asserts an EM mode control signal, the signal selector 24 selects a path for transmitting a panel power control signal (Panel_Power_Enable) from the EC 20 to the panel power switch 45. As a result, in the EM mode, the EC 20 controls whether or not to enable the supply of panel power to the display unit 17.

[0057] On the other hand, when the EM mode control signal is deasserted by the EC 20, a path is selected for transmitting a panel power control signal (Panel_Power_Enable) from the main processing unit 10 to the panel power switch 45. As a result, in the PC mode, the main processing unit 10 controls whether or not to enable the supply of panel power to the display unit 17.

[0058] 3 also shows a backlight control signal (Backlight_Enable) that controls whether or not to enable (turn on) the backlight of the display unit 17, as an example of a control signal that controls the display unit 17. This backlight control signal is connected to the display unit 17 from the main processing unit 10 via the EC 20. When controlling to the PC mode, the EC 20 transmits a backlight control signal controlled by the main processing unit 10 to the display unit 17, and when controlling to the PC mode, the EC 20 transmits a backlight control signal controlled by the EC 20 itself to the display unit 17.

[0059] Furthermore, when the EC 20 controls the EM mode, it communicates with the PD controller 43 and controls the PD controller 43 so that power is supplied from the PC 1B via the USB connector 18. As a result, when the PC 1A is used as an external monitor, it can be used while being powered by, for example, the PC 1B connected to an AC adapter, and therefore, the PC 1A can be used for a long time without consuming the power of the battery 42.

[0060] 3, for example, a DP signal for connecting an external monitor input from USB connector 18 complies with the DP (Display Port) standard, and when a DP signal for a built-in display generated by main processing unit 10 and transmitted to display unit 17 complies with the eDP standard, it is necessary to match the standard of the DP signal. For this reason, a converter for converting a DP signal compatible with the DP standard into a DP signal compatible with the eDP standard may be provided between bus selector 21 and bus selector 22.

[0061] Next, a trigger for switching between the PC mode and the EM mode will be described. For example, the EC 20 controls to the EM mode when the USB cable 5 is connected to the USB connector 18 in the PC mode. For example, when the USB cable 5 is connected to the USB connector 18 in the PC mode, the EC 20 acquires information on the connection destination using the VDM and switches to the EM mode on the condition that the connection destination PC 1B is a PC. Also, the EC 20 controls to the PC mode when the USB cable 5 connected to the USB connector 18 in the EM mode is unplugged and becomes disconnected. Below, an operation of the EM mode start process when starting the EM mode from the PC mode and an operation of the EM mode end process when ending the EM mode and returning to the PC mode will be described.

[0062] [EM mode start process] First, the operation of the EM mode start process will be described. 4 is a flowchart showing an example of an EM mode start process according to the present embodiment. Here, an operation of a process in which PC1A starts the EM mode due to the connection between PC1A and PC1B via the USB cable 5 will be described.

[0063] (Step S101) When PC1A and PC1B are connected by the USB cable 5, the PD controller 43 of PC1A and the PD controller 43 of PC1B negotiate communication via the CC terminal. After that, the PD controller 43 of PC1A and the PD controller 43 of PC1B communicate via the CC terminal. Then, the process proceeds to step S103.

[0064] (Step S103) For example, the PD controller 43 of PC1A is set to the power receiving side, and the PD controller 43 of PC1B is set to the power supply side. Note that this setting of the power receiving side and the power supply side is just an example, and in reality, they are set randomly. Then, the process proceeds to step S105.

[0065] (Step S105) The PD controller 43 of the PC 1B detects the DP (Display Port) of the PD controller 43 of the PC 1A (DP detection mode), and then proceeds to the process of step S107.

[0066] (Step S107) The PD controller 43 of PC 1A responds with the DP mode (DP source or DP sink) to the PD controller 43 of PC 1B (DP detection mode response). Then, the process proceeds to step S109.

[0067] (Step S109) The PD controller 43 of PC 1B confirms that the connection destination is not set as a DP sink based on the response from the PD controller 43 of PC 1A. Then, the process proceeds to step S111.

[0068] (Step S111) Preparations are made for communication using VDM (VDM communication) between the PD controller 43 of PC 1A and the PD controller 43 of PC 1B, and when the preparations are complete, the process proceeds to step S113.

[0069] (Step S113) When preparation for VDM communication is completed in step S111, the PD controller 43 of PC1A transmits an interrupt signal to the EC 20. Here, communication is performed between the PD controller 43 of PC1A and the EC 20 via a serial bus such as I2C. Then, the process proceeds to step S115.

[0070] (Step S115) The EC 20 requests the PD controller 43 of the PC 1A to transmit a VDM in order to obtain system information of the connection destination. Then, the process proceeds to step S117.

[0071] (Step S117) The PD controller 43 of PC1A inquires of the PD controller 43 of PC1B about system information using the VDM. For example, the VDM defines system type, display output, EM mode, and the like as system information. For example, the system type is set to information about whether it is a PC or not, the display output is set to information about whether display output is possible, and the EM mode is set to information about whether the EM mode is enabled or disabled. The PD controller 43 of PC1A inquires about information about the system type, display output, EM mode, and the like defined in the system information of the connection destination using the VDM. Then, the process proceeds to step S119.

[0072] (Step S119) In response to the inquiry from the PD controller 43 of PC1A, the PD controller 43 of PC1B transmits the system information of PC1B to the PD controller 43 of PC1A by using the VDM. Then, the process proceeds to step S121.

[0073] (Step S121) When the PD controller 43 of PC 1A acquires the system information of PC 1B transmitted from the PD controller 43 of PC 1B in step S119, the PD controller 43 of PC 1A transmits an interrupt signal to the EC 20. Then, the process proceeds to step S123.

[0074] (Step S123) The EC 20 confirms, based on the system information of PC 1B acquired in step S121, that the connection destination (PC 1B) is a PC and display output is possible, and notifies the PD controller 43 of PC 1A to that effect. Then, the process proceeds to step S125.

[0075] (Step S125) The EC 20 temporarily disables the USB port for the PD controller 43 of the PC 1A. Then, the process proceeds to step S127.

[0076] (Step S127) In response to the USB port being disabled, communication between the PD controller 43 of PC 1A and the PD controller 43 of PC 1B is cut off.

[0077] (Step S129) On the other hand, after the EC 20 has temporarily disabled the USB port in step S125, if the system is running on the PC 1A, it starts shutting down the system. This causes the main processing unit 10 to shut down the system and stop its operation. Then, the process proceeds to step S131.

[0078] (Step S131) ​​The EC 20 asserts the EM mode control signal to start control to the EM mode, and then proceeds to the process of step S133.

[0079] (Step S133) The EC 20 communicates with the PD controller 43 of the PC 1A to set the DP source to the DP sink, and sets the power supply function from enabled to disabled. Then, the process proceeds to step S135.

[0080] (Step S135) The EC 20 sets the USB port to be valid again for the PD controller 43 of the PC 1A. Then, the process proceeds to step S137.

[0081] (Step S137) In response to the USB port becoming valid, the PD controller 43 of PC1A and the PD controller 43 of PC1B negotiate communication via the CC terminal and are reconnected. Then, the process proceeds to step S139.

[0082] (Step S139) Since the power supply function of the PD controller 43 of PC1A is disabled, it is set to the power receiving side, and the PD controller 43 of PC1B is set to the power supply side. Then, the process proceeds to step S141.

[0083] (Step S141) The PD controller 43 of PC 1B detects that the PD controller 43 of PC 1A is set to the DP sink, and recognizes PC 1A as an external monitor. Then, the process proceeds to step S143.

[0084] (Step S143) The PD controller 43 of the PC 1A transmits an interrupt signal to the EC 20. Then, the process proceeds to step S145.

[0085] (Step S145) The EC 20 starts controlling the display unit 17 as an external monitor. For example, the EC 20 can control the screen brightness (backlight brightness) of the display unit 17 in response to an operation on a brightness adjustment key assigned to a function key of the keyboard (input device 30).

[0086] This enables PC1A to be used as an external display in the EM mode, and enables display output from PC1B to PC1A by USB communication via the USB cable 5.

[0087] By defining the priority order of devices that will become external monitors in the VDM, the user can determine which PC will function as the external monitor when PC1A and PC1B are connected.

[0088] [EM mode termination process] Next, the operation of the EM mode ending process will be described. Fig. 5 is a flowchart showing an example of the EM mode termination process according to the present embodiment. Here, the operation of the process in which PC1A terminates the EM mode due to the USB cable 5 being unplugged and disconnected after PC1A starts the EM mode by the EM mode start process shown in Fig. 4 will be described.

[0089] (Step S201) When the USB cable 5 connecting PC1A and PC1B is unplugged and communication is disconnected, the process proceeds to step S203.

[0090] (Step S203) The PD controller 43 of the PC 1A transmits an interrupt signal to the EC 20. Then, the process proceeds to step S205.

[0091] (Step S205) The EC 20 temporarily disables the USB port for the PD controller 43 of the PC 1A. Then, the process proceeds to step S207.

[0092] (Step S207) The EC 20 deasserts the EM mode control signal, and proceeds to the process of step S209.

[0093] (Step S209) The EC 20 changes the state from DP sink to DP source by communicating with the PD controller 43 of the PC 1A, and changes the power supply function from disabled to enabled. Then, the process proceeds to step S211.

[0094] (Step S211) The EC 20 sets the USB port to be valid again for the PD controller 43 of the PC 1A.

[0095] This causes PC1A to exit the EM mode and return to the PC mode, after which the system can be started by EC20.

[0096] In the EM mode start process shown in Fig. 4, since PC 1A is in the EM mode in a shut down state, it may end the EM mode and start the system when the power button 35 is pressed even if the USB cable 5 is not unplugged. Also, PC 1A may start the system in the background while remaining in the EM mode when the power button 35 is pressed. Also, in the EM mode start process shown in Fig. 4, PC 1A may be controlled from the PC mode to the EM mode without shutting down.

[0097] [Summary of the first embodiment] As described above, the PC1 (for example, PC1A) as the information processing device according to the present embodiment includes the display unit 17, the system memory 14 (an example of a memory) that stores a system program, the main processing unit 10 (an example of a first processor), the EC 20 (an example of a second processor), a USB connector 18 (an example of a connection unit), a bus selector 21 (an example of a first selection unit), and a signal selector 23 (an example of a second selection unit). The main processing unit 10 executes system processing based on the program stored in the system memory 14, and executes display processing that generates a DP signal (an example of a video signal) to be displayed on the display unit 17 based on the system processing. The EC 20 can execute processing regardless of the operating state of the main processing unit 10. The USB connector 18 is connected to a USB cable 5 that transmits input / output signals including the DP signal to an external device. The bus selector 21 selects, under the control of the EC 20, either a path (first path) for transmitting a DP signal generated by the display processing by the main processing unit 10 to the display unit 17, or a path (second path) for transmitting a DP signal input to the USB connector 18 to the display unit 17. The signal selector 23 selects, under the control of the EC 20, either a path (third path) for transmitting a control signal (e.g., a luminance control signal (Backlight_PWM)) for the main processing unit 10 to control the display unit 17 to the display unit 17, or a path (fourth path) for transmitting a control signal (e.g., a luminance control signal (Backlight_PWM)) for the EC 20 to control the display unit 17 to the display unit 17.

[0098] This allows the display unit 17 (built-in display) of the PC1 (for example, PC1A) to easily function as an external monitor by being connected by wire via USB. That is, the PC1 (for example, PC1A) can be used as an external monitor equipped with a USB connector 18 (for example, a USB Type-C connector).

[0099] For example, in the PC mode (first mode), the EC 20 controls the bus selector 21 to select a first path (a path for transmitting a DP signal generated by the display processing by the main processing unit 10 to the display unit 17) and controls the signal selector 23 to select a third path (a path for transmitting a control signal (e.g., a luminance control signal (Backlight_PWM)) by which the main processing unit 10 controls the display unit 17 to the display unit 17). On the other hand, in the EM mode (second mode), the EC 20 controls the bus selector 21 to select a second path (a path for transmitting a DP signal input to the USB connector 18 to the display unit 17) and controls the signal selector 23 to select a fourth path (a path for transmitting a control signal (e.g., a luminance control signal (Backlight_PWM)) by which the EC 20 controls the display unit 17 to the display unit 17).

[0100] This allows PC1 (e.g., PC1A) to appropriately switch the transmission path of the DP signal and the control signal of display unit 17 depending on whether display unit 17 is used as a built-in display or an external monitor, regardless of the operating state of main processing unit 10.

[0101] Moreover, PC1 (for example, PC1A) further includes a bus selector 22 (an example of a third selection unit) that selects, under the control of EC 20, either a path (fifth path) for transmitting a DP signal generated by display processing by the main processing unit 10 to the USB connector 18 or a path (sixth path) from the second path for transmitting a DP signal input to the USB connector 18 to the bus selector 21. In the EM mode (second mode), EC 20 controls the bus selector 22 to select the sixth path (path for transmitting a DP signal input to the USB connector 18 to the bus selector 21).

[0102] In addition, in the PC mode (first mode), the EC 20 controls the bus selector 22 to select the fifth path (a path for transmitting the DP signal generated by the display process by the main processing unit 10 to the USB connector 18).

[0103] This allows the PC1 (for example, PC1A) to appropriately switch between a case where the display unit 17 is used as an external monitor and a case where the PC1 (for example, PC1A) is connected to an external monitor and used.

[0104] In addition, in the PC mode (first mode), the EC20 controls the system executed by the main processing unit 10 to be in an active state, and in the EM mode (second mode), the EC20 controls the system executed by the main processing unit 10 to be in a shut down state.

[0105] As a result, when PC1 (for example, PC1A) is used as an external monitor, the operation of major components such as the main processing unit 10 is stopped, so power consumption can be reduced. Therefore, PC1 (for example, PC1A) can be used as an external monitor using only bus power from, for example, the USB connector 18. In this case, only PC1B can be connected to an AC adapter for long-term use, which is convenient because there is no need to prepare two AC adapters and connect them to PC1A and PC1B respectively.

[0106] Furthermore, when the USB cable 5 is connected to the USB connector 18 in the PC mode (first mode), the EC 20 performs control to switch to the EM mode (second mode).

[0107] This makes it convenient because the PC 1 (eg, PC 1A) can be automatically used as an external monitor simply by connecting it to another PC 1 (eg, PC 1B) via the USB cable 5 without requiring any user operation.

[0108] Furthermore, the EC 20 performs control to switch to the PC mode (first mode) because the USB cable 5 connected to the USB connector 18 in the EM mode (second mode) is disconnected.

[0109] This provides a high level of convenience since, when PC1 (eg, PC1A) is being used as an external monitor, it can be switched to being used as a normal PC simply by unplugging the USB cable 5.

[0110] Moreover, PC1 (for example, PC1A) further includes a PD controller 43 (an example of a power supply control unit) that controls the direction of power supply to an external device (for example, PC1B) connected to the USB connector 18 via the USB cable 5. In the EM mode (second mode), the EC 20 controls the PD controller 43 so that power is supplied from the external device (for example, PC1B) via the USB connector 18.

[0111] This allows PC1 (for example, PC1A) to be used as an external monitor using only bus power from the USB connector 18. For example, since only PC1B can be connected to an AC adapter for extended use, it is not necessary to prepare two AC adapters and connect them to PC1A and PC1B, which is convenient.

[0112] According to the present embodiment, a control method for a PC 1 (e.g., PC 1A) as an information processing device including a display unit 17, a system memory 14 (an example of a memory) that stores a system program, a main processing unit 10 (an example of a first processor), an EC 20 (an example of a second processor), a USB connector 18 (an example of a connection unit), a bus selector 21 (an example of a first selection unit), and a signal selector 23 (an example of a second selection unit) is as follows: in the PC mode (first mode), the EC 20 causes the bus selector 21 to select a first path (a path for transmitting a DP signal generated by a display process by the main processing unit 10 to the display unit 17). and in the EM mode (second mode), the bus selector 21 selects the second path (a path along which the main processing unit 10 transmits a control signal (e.g., a brightness control signal (Backlight_PWM)) for controlling the display unit 17 to the display unit 17), and in the EM mode (second mode), the bus selector 21 selects the second path (a path along which the DP signal input to the USB connector 18 transmits to the display unit 17) and controls the signal selector 23 to select the fourth path (a path along which the EC 20 transmits a control signal (e.g., a brightness control signal (Backlight_PWM)) for controlling the display unit 17 to the display unit 17).

[0113] Thus, according to the control method in PC1 (for example, PC1A), the display unit 17 (built-in display) can be easily made to function as an external monitor by being connected by wire via USB. That is, PC1 (for example, PC1A) can be used as an external monitor equipped with a USB connector 18 (for example, a USB Type-C connector).

[0114] <Second embodiment> Next, a second embodiment of the present invention will be described. In the first embodiment, PC1B, which uses PC1A as an external monitor, must be able to communicate using a VDM defined the same as PC1A. In this embodiment, an example of PC1A that can be used as an external monitor for PC1B even if PC1B is a general-purpose PC that does not support communication using the above VDM will be described.

[0115] The basic configuration of PC1A as an information processing device according to this embodiment is the same as that shown in Fig. 2 and Fig. 3, and therefore the description thereof will be omitted. In this embodiment, PC1A is controlled to enter the EM mode due to the system being shut down. As a result, when PC1B, a general-purpose PC, is connected thereafter, it is recognized as an external monitor.

[0116] 6 is a flowchart showing an example of the EM mode start process according to the present embodiment. The operation of the EM mode start process when the EM mode is started due to the system being shut down will be described with reference to this FIG.

[0117] (Step S301) When the EC 20 detects a shutdown of the system executed by the main processing unit 10 in the PC mode, the process proceeds to step S303.

[0118] (Step S303) The EC 20 temporarily disables the USB port for the PD controller 43 of the PC 1A. Then, the process proceeds to step S305.

[0119] (Step S305) The EC 20 asserts the EM mode control signal to start control to the EM mode, and then proceeds to the process of step S307.

[0120] (Step S307) The EC 20 communicates with the PD controller 43 of the PC 1A to set the DP source to the DP sink, and sets the power supply function from enabled to disabled. Then, the process proceeds to step S309.

[0121] (Step S309) The EC 20 sets the USB port to be valid again for the PD controller 43 of the PC 1A. Then, the process proceeds to step S311.

[0122] (Step S311) When PC1A and PC1B are connected by the USB cable 5, the PD controller 43 of PC1A and the PD controller 43 of PC1B negotiate communication via the CC terminal. After that, the PD controller 43 of PC1A and the PD controller 43 of PC1B communicate via the CC terminal. Then, the process proceeds to step S313.

[0123] (Step S313) Since the power supply function of the PD controller 43 of PC1A is disabled, it is set to the power receiving side, and the PD controller 43 of PC1B is set to the power supply side. Then, the process proceeds to step S315.

[0124] (Step S315) The PD controller 43 of PC 1B detects that the PD controller 43 of PC 1A is set to the DP sink, and recognizes PC 1A as an external monitor. Then, the process proceeds to step S317.

[0125] (Step S317) The PD controller 43 of the PC 1A transmits an interrupt signal to the EC 20. Then, the process proceeds to step S319.

[0126] (Step S319) The EC 20 starts controlling the display unit 17 as an external monitor. For example, the EC 20 can control the screen brightness (backlight brightness) of the display unit 17 in response to an operation on a brightness adjustment key assigned to a function key of the keyboard (input device 30).

[0127] As a result, even if PC1B is a general-purpose PC, PC1A can be used as an external display in EM mode, and display output from PC1B to PC1A becomes possible by USB communication via USB cable 5.

[0128] The EC 20 may control the EM mode on the condition that the PC 1A and the PC 1B are connected via the USB cable 5 when the system is shut down.

[0129] Fig. 7 is a flowchart showing an example of the EM mode end process according to the present embodiment. After the PC 1A starts the EM mode in response to the shutdown of the system by the EM mode start process shown in Fig. 6, the operation of the process in which the PC 1A ends the EM mode in response to the startup of the system will be described with reference to Fig. 7.

[0130] (Step S401) When the EC 20 detects power-on for starting up the system (for example, pressing of the power button 35), the EC 20 proceeds to the process of step S403.

[0131] (Step S403) The EC 20 temporarily disables the USB port for the PD controller 43 of the PC 1A. Then, the process proceeds to step S405.

[0132] (Step S405) In response to the USB port being disabled, communication between the PD controller 43 of PC 1A and the PD controller 43 of PC 1B is cut off.

[0133] (Step S407) On the other hand, after temporarily disabling the USB port in step S403, the EC 20 deasserts the EM mode control signal and proceeds to the process of step S409.

[0134] (Step S409) The EC 20 changes the state from DP sink to DP source by communicating with the PD controller 43 of the PC 1A, and changes the power supply function from disabled to enabled. Then, the process proceeds to step S411.

[0135] (Step S411) The EC 20 sets the USB port to be valid again for the PD controller 43 of the PC 1A. This causes the PC 1A to end the EM mode, and the system starts up in the PC mode.

[0136] (Step S413) In response to the USB port becoming enabled, the PD controller 43 of PC1A and the PD controller 43 of PC1B negotiate communication via the CC terminal and are reconnected.

[0137] Although an example in which PC1A ends the EM mode in response to system startup has been described with reference to FIG. 7, the EM mode may be ended when PC1A and PC1B become disconnected, instead of when the system starts up.

[0138] In this embodiment, an example has been described in which PC1A can be used as an external monitor for PC1B even if PC1B is a general-purpose PC. However, naturally, the EM mode start processing in FIG. 6 and the EM mode end processing in FIG. 7 can also be applied even if PC1B is a PC capable of communicating using a VDM defined in the same way as PC1A, as in the first embodiment.

[0139] [Summary of the second embodiment] As described above, in the PC1 (e.g., PC1A) as an information processing device in this embodiment, the EC20 controls the PC1 to the EM mode (second mode) due to the system executed by the main processing unit 10 being shut down in the PC mode (first mode).

[0140] This allows PC1 (e.g., PC1A) to easily function as an external monitor by being connected via a USB cable in a shut-down state. For example, when PC1 (e.g., PC1A) functions as an external monitor in a shut-down state, even a general-purpose PC (e.g., a conventional PC that does not support communication using VDM, a PC from another vendor, etc.) can easily function as an external monitor by being connected via a USB cable.

[0141] Moreover, the EC 20 controls the system to be executed in the PC mode (first mode) in response to the start of the system executed by the main processing unit 10 in the EM mode (second mode).

[0142] This allows the user to start up the system and use PC1 (for example, PC1A) as a PC while it is being used as an external monitor in a shut-down state.

[0143] Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to the above embodiment, and the present invention also includes designs that do not deviate from the gist of the present invention. For example, the configurations described in the above embodiment can be combined in any combination.

[0144] In the above embodiment, PC1A and PC1B are connected by a USB cable 5 compatible with a USB connector 18 (e.g., a USB Type-C connector), but the connection between PC1A and PC1B may be compatible with other communication standards.

[0145] In the above embodiment, the display unit 17 of PC1A may be used not only as an external monitor of PC1B but also as an external input device, and the input device 30 (keyboard, touch pad, track point, etc.) of PC1A may be used as an external input device. For example, similar to switching the transmission path of the DP signal in the EM mode, PC1A can switch between a path for transmitting an operation signal acquired from an external input device connected via the USB connector 18 to the main processing unit 10 and a path for transmitting an operation signal acquired by the EC 20 from the input device 30 to PC1B connected via the USB connector 18, thereby making the input device 30 function as an external input device.

[0146] In addition, in the above embodiment, a brightness control signal (Backlight_PWM), a backlight control signal (Backlight_Enable), a panel power control signal (Panel_Power_Enable), etc. are described as examples of control signals for controlling the display unit 17. However, the types of control signals are not limited to these, and any control signal required depending on the type and use of the display unit 17 will be subject to control.

[0147] The PC1 as the information processing device described above has a computer system inside. A program for realizing the functions of each component of the PC1 as the information processing device described above may be recorded in a computer-readable recording medium, and the program recorded in the recording medium may be read into the computer system and executed to perform processing in each component of the PC1 as the information processing device described above. Here, "reading the program recorded in the recording medium into the computer system and executing it" includes installing the program into the computer system. The "computer system" here includes hardware such as an OS and peripheral devices. The "computer system" may also include multiple computer devices connected via a network including the Internet, a WAN, a LAN, a dedicated line, and other communication lines. The "computer-readable recording medium" refers to a portable medium such as a flexible disk, an optical magnetic disk, a ROM, a CD-ROM, and a storage device such as a hard disk built into a computer system. In this way, the recording medium storing the program may be a non-transitory recording medium such as a CD-ROM.

[0148] The recording medium also includes a recording medium installed inside or outside and accessible from a distribution server to distribute the program. The program may be divided into a plurality of parts, downloaded at different times, and then combined with each component of the PC1 as the information processing device, or each divided program may be distributed by a different distribution server. Furthermore, the "computer-readable recording medium" includes a recording medium that holds a program for a certain period of time, such as a volatile memory (RAM) inside a computer system that becomes a server or a client when a program is transmitted via a network. The above program may also be a recording medium for realizing part of the above-mentioned functions. Furthermore, the recording medium may be a so-called difference file (difference program) that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

[0149] In addition, some or all of the functions of the PC1 as the information processing device in the above-mentioned embodiment may be realized as an integrated circuit such as an LSI (Large Scale Integration). Each function may be individually processed, or some or all of the functions may be integrated into a processor. The integrated circuit method is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to the advancement of semiconductor technology, an integrated circuit based on that technology may be used.

[0150] Furthermore, the PC 1 as the information processing device in the above embodiment is not limited to a notebook PC, but may be, for example, a desktop PC, a tablet PC, or a smartphone. [Explanation of symbols]

[0151] 1 Information processing device, 10 Main processing unit, 11 CPU, 12 GPU, 13 Chipset, 14 System memory, 15 Communication unit, 16 Storage unit, 17 Display unit, 18 USB connector, 20 EC, 21 Bus selector, 22 Bus selector, 23 Signal selector, 24 Signal selector, 30 Input device, 35 Power button, 40 Power supply unit, 45 Panel power switch

Claims

1. A display unit; A memory for storing a system program; a first processor that executes a system process based on the program stored in the memory, and executes a display process that generates a video signal to be displayed on the display unit based on the system process; a second processor capable of executing a process regardless of an operating state of the first processor; a connection section to which a cable for transmitting input / output signals including a video signal to an external device is connected; a first selection unit that selects, under control of the second processor, either a first path for transmitting a video signal generated by the display process by the first processor to the display unit or a second path for transmitting a video signal input to the connection unit to the display unit; a second selection unit that selects, under control of the second processor, one of a third path through which the first processor transmits a control signal for controlling the display unit to the display unit and a fourth path through which the second processor transmits a control signal for controlling the display unit to the display unit; An information processing device comprising:

2. The second processor In a first mode, the control unit 100 controls the first selection unit 100 to select the first route and the second selection unit 100 to select the third route, and in a second mode, the control unit 100 controls the first selection unit 100 to select the second route and the second selection unit 100 to select the fourth route. The information processing device according to claim 1 .

3. a third selection unit that selects, under control of the second processor, either a fifth path that transmits a video signal generated by the display process by the first processor to the connection unit or a sixth path that transmits a video signal input to the connection unit among the second paths to the first selection unit; The second processor In the second mode, control is performed to cause the third selection unit to select the sixth path. The information processing device according to claim 2 .

4. The second processor In the first mode, the system executed by the first processor is controlled to be in an active state; In the second mode, the system executed by the first processor is controlled to be in a shut down state.

4. The information processing device according to claim 2.

5. The second processor When the cable is connected to the connection portion in the first mode, the control is performed to switch to the second mode. The information processing device according to claim 4.

6. The second processor When the cable connected to the connection unit in the second mode becomes disconnected, the control is switched to the first mode. The information processing device according to claim 5 .

7. The second processor controlling the system to the second mode when the system executed by the first processor in the first mode is shut down; The information processing device according to claim 4.

8. The second processor controlling the system to the first mode in response to a start of a system executed by the first processor in the second mode; The information processing device according to claim 7.

9. a power supply control unit that controls a power supply direction between the connection unit and an external device connected to the connection unit via the cable, The second processor In the second mode, the power supply control unit is controlled so that power is supplied from the external device via the connection unit. The information processing device according to claim 2 .

10. a first processor that executes system processing and executes display processing for generating a video signal to be displayed on the display unit based on the system processing; a second processor that is capable of executing processing regardless of an operating state of the first processor; a connection unit to which a cable that transmits input / output signals including a video signal to an external device is connected; a first selection unit that selects either a first path that transmits a video signal generated by the display processing by the first processor to the display unit or a second path that transmits a video signal input to the connection unit to the display unit; and a second selection unit that selects either a third path that transmits a control signal that controls the display unit from the first processor to the display unit or a fourth path that transmits a control signal that controls the display unit from the second processor to the display unit, The second processor: In a first mode, a control is performed to cause the first selection unit to select the first route and the second selection unit to select the third route; In a second mode, performing control to cause the first selection unit to select the second route and the second selection unit to select the fourth route; A control method comprising:

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