Sink device and method for operating same

Abstract

A sink device according to an embodiment of the present disclosure may comprise: a display capable of receiving a touch input; an external device interface for receiving a video signal from a source device through a universal serial bus (USB) standard; and a controller for detecting that the sink device is connected to the source device through the USB standard, and when the display outputs the video signal, switching a processing subject of the touch input, received through the display, from the sink device to the source device.

Description

Sync device and method of operation thereof

[0001] The present disclosure relates to a sink device.

[0002] The USB-C input of the stand-type display device will be supported, similar to the touch support of the USB-C DP Alt (DisplayPort Alternate) mode of commercial products.

[0003] However, unlike commercial products, the stand-alone display device is a product with its own OS (Operating System) and does not transmit touch input to an external device, but rather processes the touch input with its own OS.

[0004] Since USB-C DP Alt mode requires external devices to be controlled by touch, there is an issue that causes conflicts with the use of the OS.

[0005] This is fundamentally due to the product characteristics of the stand-alone display device, which is both a sink device and a source device in its own right.

[0006] The purpose of the present disclosure is to prevent conflicts in processing touch input when a touch input is applied to a sink device while a source device and a sink device are connected via USB.

[0007] The purpose of the present disclosure is to freely switch the processing subject for touch input for a sink device during a USB connection between a source device and a sink device.

[0008] A sink device according to an embodiment of the present disclosure may include a display capable of receiving a touch input, an external device interface for receiving a video signal from a source device via a USB (Universal Serial Bus) standard, and a controller for detecting a connection with the source device via the USB standard and switching the processing subject of the touch input received via the display from the sink device to the source device when the display outputs the video signal.

[0009] A method of operating a sink device having a display capable of receiving a touch input and an external device interface for receiving a video signal from a source device through a USB (Universal Serial Bus) standard according to an embodiment of the present disclosure may include a step of detecting a connection with the source device through the USB standard, a step of receiving the video signal, and a step of switching a processing subject of the touch input received through the display from the sink device to the source device when the display outputs the video signal.

[0010] According to an embodiment of the present disclosure, when a touch input is applied to a sink device while a source device and a sink device are connected via USB, conflicts in the processing of the touch input can be prevented. Accordingly, errors in operation due to the touch input can be prevented in advance.

[0011] Figure 1 is a block diagram illustrating the configuration of a display device according to one embodiment of the present invention.

[0012] FIG. 2 is a drawing illustrating the configuration of a display system according to one embodiment of the present disclosure.

[0013] FIG. 3 is a flowchart for explaining an operation method of a sink device according to an embodiment of the present invention.

[0014] FIG. 4 is a flowchart illustrating a process of determining a processing subject of a touch input based on detection of a specific action when a source device is determined to be a processing subject of a touch input according to an embodiment of the present invention.

[0015] FIG. 5 is a flowchart illustrating a process of determining a processing subject of a touch input based on detection of a specific action when a source device is determined to be a processing subject of a touch input according to another embodiment of the present invention.

[0016] FIG. 6A and FIG. 6B are drawings for explaining the horizontal mode and vertical mode of a stand-alone display device according to an embodiment of the present disclosure.

[0017] Hereinafter, embodiments related to the present invention will be described in more detail with reference to the drawings. The suffixes "module" and "part" used in the following description for components are assigned or used interchangeably solely for the convenience of writing the specification, and do not in themselves have distinct meanings or roles.

[0018] A display device according to an embodiment of the present invention is, for example, an intelligent display device that adds computer-assisted functionality to its broadcast reception function. While faithfully performing the broadcast reception function, it can also be equipped with Internet functionality and other features, providing a more user-friendly interface, such as a manual input device, touch screen, or space remote control. Furthermore, with support for wired or wireless Internet functionality, it can connect to the Internet and a computer, enabling functions such as email, web browsing, banking, or gaming. A standardized, general-purpose operating system can be used for these various functions.

[0019] Accordingly, the display device described in the present invention can perform various user-friendly functions, for example, by allowing various applications to be freely added or deleted on a general-purpose operating system kernel. More specifically, the display device can be a network TV, HBB TV, smart TV, LED TV, OLED TV, etc., and in some cases, it can also be applied to smartphones.

[0020] FIG. 1 is a block diagram illustrating the configuration of a display device according to one embodiment of the present invention.

[0021] Referring to FIG. 1, the display device (100) may include a broadcast receiving unit (130), an external device interface (135), a memory (140), a user input interface (150), a controller (170), a wireless communication interface (173), a display (180), a speaker (185), and a power supply circuit (190).

[0022] The broadcast receiving unit (130) may include a tuner (131), a demodulator (132), and a network interface (133).

[0023] The tuner (131) can select a specific broadcast channel according to a channel selection command. The tuner (131) can receive a broadcast signal for the selected specific broadcast channel.

[0024] The demodulator (132) can separate the received broadcast signal into a video signal, an audio signal, and a data signal related to the broadcast program, and can restore the separated video signal, audio signal, and data signal into a form that can be output.

[0025] The external device interface (135) can receive an application or a list of applications within an adjacent external device and transmit it to the controller (170) or memory (140).

[0026] The external device interface (135) can provide a connection path between the display device (100) and the external device. The external device interface (135) can receive one or more of images and audio output from an external device connected wirelessly or wiredly to the display device (100) and transmit them to the controller (170). The external device interface (135) can include a plurality of external input terminals. The plurality of external input terminals can include an RGB terminal, one or more HDMI (High Definition Multimedia Interface) terminals, and a component terminal.

[0027] A video signal of an external device input through an external device interface (135) can be output through a display (180). A voice signal of an external device input through an external device interface (135) can be output through a speaker (185).

[0028] An external device that can be connected to the external device interface (135) may be any one of a set-top box, a Blu-ray player, a DVD player, a game console, a sound bar, a smartphone, a PC, a USB memory, and a home theater, but this is only an example.

[0029] The network interface (133) may provide an interface for connecting the display device (100) to a wired / wireless network including the Internet. The network interface (133) may transmit or receive data to or from other users or other electronic devices via the connected network or another network linked to the connected network.

[0030] Additionally, some content data stored in the display device (100) can be transmitted to a selected user or electronic device among other users or other electronic devices pre-registered in the display device (100).

[0031] The network interface (133) can access a predetermined web page through a connected network or another network linked to the connected network. That is, by accessing a predetermined web page through a network, data can be transmitted or received with the corresponding server.

[0032] In addition, the network interface (133) can receive content or data provided by a content provider or network operator. That is, the network interface (133) can receive content such as movies, advertisements, games, VOD, broadcast signals, etc. and information related thereto provided from a content provider or network provider via a network.

[0033] Additionally, the network interface (133) can receive firmware update information and update files provided by the network operator, and can transmit data to the Internet or content provider or network operator.

[0034] The network interface (133) can select and receive a desired application from among applications open to the public via a network.

[0035] The memory (140) stores a program for each signal processing and control within the controller (170), and can store signal-processed image, voice, or data signals.

[0036] In addition, the memory (140) may perform a function for temporary storage of video, audio, or data signals input from an external device interface (135) or a network interface (133), and may store information about a specific image through a channel memory function.

[0037] The memory (140) can store an application or a list of applications input from an external device interface (135) or a network interface (133).

[0038] The display device (100) can play content files (video files, still image files, music files, document files, application files, etc.) stored in the memory (140) and provide them to the user.

[0039] The user input interface (150) can transmit a signal input by the user to the controller (170) or transmit a signal from the controller (170) to the user. For example, the user input interface (150) can receive and process control signals such as power on / off, channel selection, and screen setting from the remote control device (200) according to various communication methods such as Bluetooth, Ultra Wideband (WB), ZigBee, Radio Frequency (RF) communication, or infrared (IR) communication, or process control signals from the controller (170) to be transmitted to the remote control device (200).

[0040] In addition, the user input interface (150) can transmit control signals input from local keys (not shown) such as a power key, channel key, volume key, and setting value to the controller (170).

[0041] An image signal processed by the controller (170) can be input to the display (180) and displayed as an image corresponding to the image signal. In addition, an image signal processed by the controller (170) can be input to an external output device through an external device interface (135).

[0042] The voice signal processed by the controller (170) can be output as audio to the speaker (185). In addition, the voice signal processed by the controller (170) can be input to an external output device through the external device interface (135).

[0043] In addition, the controller (170) can control the overall operation within the display device (100).

[0044] In addition, the controller (170) can control the display device (100) by a user command or internal program input through the user input interface (150), and can connect to a network to enable the user to download a desired application or application list into the display device (100).

[0045] The controller (170) enables the user-selected channel information, etc. to be output through a display (180) or speaker (185) together with processed video or audio signals.

[0046] In addition, the controller (170) allows a video signal or audio signal from an external device, for example, a camera or camcorder, input through the external device interface (135) to be output through the display (180) or speaker (185) in accordance with an external device video playback command received through the user input interface (150).

[0047] Meanwhile, the controller (170) can control the display (180) to display an image, for example, a broadcast image input through a tuner (131), an external input image input through an external device interface (135), an image input through a network interface, or an image stored in a memory (140) can be controlled to be displayed on the display (180). In this case, the image displayed on the display (180) can be a still image or a moving image, and can be a 2D image or a 3D image.

[0048] In addition, the controller (170) can control the playback of content stored in the display device (100), received broadcast content, or external input content input from outside, and the content can be in various forms such as broadcast video, external input video, audio file, still image, connected web screen, and document file.

[0049] The wireless communication interface (173) can communicate with an external device through wired or wireless communication. The wireless communication interface (173) can perform short-range communication with the external device. To this end, the wireless communication interface (173) can support short-range communication using at least one of Bluetooth™, RFID (Radio Frequency Identification), Infrared Data Association (IrDA), UWB (Ultra Wideband), ZigBee, NFC (Near Field Communication), Wi-Fi (Wireless-Fidelity), Wi-Fi Direct, and Wireless USB (Wireless Universal Serial Bus) technologies. This wireless communication interface (173) can support wireless communication between the display device (100) and a wireless communication system, between the display device (100) and another display device (100), or between the display device (100) and a network in which the display device (100, or an external server) is located via a short-range wireless communication network (Wireless Area Network). The short-range wireless communication network can be a short-range wireless personal area network (Wireless Personal Area Network).

[0050] Here, the other display device (100) may be a wearable device (e.g., a smartwatch, smart glasses, a head-mounted display (HMD)) or a mobile terminal such as a smart phone that can exchange data with (or be linked to) the display device (100) according to the present invention. The wireless communication interface (173) may detect (or recognize) a wearable device capable of communication around the display device (100).

[0051] Furthermore, if the detected wearable device is a device certified to communicate with the display device (100) according to the present invention, the controller (170) can transmit at least a portion of the data processed in the display device (100) to the wearable device via the wireless communication interface (173). Accordingly, a user of the wearable device can utilize the data processed in the display device (100) via the wearable device.

[0052] The display (180) can generate a driving signal by converting a video signal, data signal, OSD signal processed by the controller (170) or a video signal, data signal, etc. received from an external device interface (135) into R, G, and B signals, respectively.

[0053] Meanwhile, since the display device (100) illustrated in FIG. 1 is merely an embodiment of the present invention, some of the illustrated components may be integrated, added, or omitted depending on the specifications of the display device (100) actually implemented.

[0054] That is, two or more components may be combined into a single component, or a single component may be subdivided into two or more components, as needed. Furthermore, the functions performed by each block are intended to illustrate embodiments of the present invention, and their specific operations or devices do not limit the scope of the present invention.

[0055] According to another embodiment of the present invention, the display device (100) may receive and play back an image through a network interface (133) or an external device interface (135) without having a tuner (131) and a demodulator (132), unlike that shown in FIG. 1.

[0056] For example, the display device (100) may be implemented separately as an image processing device, such as a set-top box, for receiving broadcast signals or contents according to various network services, and a content playback device for playing contents input from the image processing device.

[0057] In this case, the operating method of the display device according to the embodiment of the present invention to be described below may be performed by any one of the display device (100) described with reference to FIG. 1, as well as an image processing device such as the separated set-top box, or a content playback device having a display (180) and a speaker (185).

[0058] FIG. 2 is a drawing illustrating the configuration of a display system according to one embodiment of the present disclosure.

[0059] Referring to FIG. 2, the display system (20) may include a source device (21) and a sink device (23).

[0060] The source device (21) can be connected to the sink device (23) via the Universal Serial Bus (USB) standard.

[0061] In particular, the source device (21) and the sink device (23) can be connected via USB B-Type, USB C-type, or USB-C DP Alt (USB-C DisplayPort Alternate).

[0062] The source device (21) can transmit one or more of a video signal or an audio signal to the sink device (23).

[0063] The sink device (23) can output one or more of a video signal or audio signal received from the source device (21).

[0064] The sink device (23) may be the display device (100) illustrated in FIG. 1.

[0065] The source device (21) may be any one of a smartphone, a laptop, a PC, and a smart pad. The source device (21) may also be the display device (100) of FIG. 1.

[0066] FIG. 3 is a flowchart for explaining an operation method of a sink device according to an embodiment of the present invention.

[0067] In Fig. 3, the sink device (23) may include all components of the display device (100) of Fig. 1.

[0068] Processing touch input below may refer to performing an action corresponding to the touch input.

[0069] Referring to FIG. 3, the controller (170) of the sink device (23) can confirm that the external input is converted to a USB (Universal Serial Bus) input with the source device (21) (S301).

[0070] For example, the controller (170) can determine that the external input has been switched to USB input when a source device (21) is connected to a USB terminal provided in the external device interface (135).

[0071] As another example, the controller (170) can determine that the external input has been switched to USB input when the USB input item is selected through the external input menu while the source device (21) is connected to the USB terminal provided in the external device interface (135).

[0072] In one embodiment, the USB input may be a USB-C DP Alt (USB-C DisplayPort Alternate) input. USB-C DP Alt (USB-C DisplayPort Alternate) may indicate a specification (or mode) for transmitting video signals through a USB-C connection port.

[0073] Another USB input may indicate input via a standard USB-C type or input via a USB-B type.

[0074] The controller (170) of the sink device (23) receives a video signal from the source device (21) (S303).

[0075] The controller (170) can receive a video signal from a source device (21) connected via an external device interface (135) and a USB standard.

[0076] The video signal may be a signal being output by the source device (21). Specifically, the video signal may be a signal corresponding to a video displayed on the display of the source device (21).

[0077] The controller (170) of the sink device (23) can determine the processing subject of the touch input based on the received video signal (S305).

[0078] The controller (170) can determine the processing subject of a touch input received on a display (180) having a touch panel function based on a video signal received from a source device (21).

[0079] The processing entity of the touch input may be either the source device (21) or the sink device (23). Before the external input is switched to the USB input, the processing entity of the touch input may be the sink device (23).

[0080] The controller (170) can monitor a video signal received from the source device (21) and, based on the monitoring result, determine whether to switch the processing subject of the touch input from the sink device (23) to the source device (21).

[0081] In one embodiment, the controller (170) can switch the processing subject of the touch input from the sink device (23) to the source device (21) when the display (180) outputs the video signal received from the source device (21). The controller (170) can switch the processing subject of the touch input from the sink device (23) to the source device (21) from the time when the display (180) outputs the video signal received from the source device (21).

[0082] When the processing subject of the touch input is switched to the source device (21), the controller (170) can bypass the touch data or touch data corresponding to the touch input to the source device (21).

[0083] Thereafter, the controller (170) can maintain the processing subject of the touch input as the source device (21) when the USB input from the source device (21) is maintained and the video signal is output normally. The case where the USB input is maintained may be when the source device (21) is maintained connected to the USB port of the external device interface (135) of the sink device (23).

[0084] Afterwards, the controller (170) can re-switch the processing subject of the touch input from the source device (21) to the sink device (23) if the USB input is not maintained or the video signal is not output normally.

[0085] If the video signal is not output normally, the source device (21) may be connected to the sink device (23) via a USB cable, but the source device (21) may be turned off. If the source device (21) is turned off, the video signal may not be transmitted to the sink device (23). Accordingly, the sink device (23) cannot output the video signal normally.

[0086] As another example, if the controller (170) detects that it is connected to the source device (21) via the USB standard, it can switch the subject of the touch input from the sink device (23) to the source device (21).

[0087] The controller (170) detects that it is connected to the source device (21) via the USB standard, and when a video signal is output on the display (180), the processing subject of the touch input can be switched from the sink device (23) to the source device (21). That is, by adding a condition that the video signal is output normally, an unintended switching of the processing subject of the touch input can be prevented.

[0088] If the controller (170) of the sink device (23) determines that the processing subject of the touch input is the source device (21) (S307), it can transmit touch data corresponding to the touch input to the source device (21) (S309).

[0089] When the processing subject of the touch input is switched to the source device (21), the controller (170) can bypass the touch data or touch data corresponding to the touch input to the source device (21).

[0090] When the controller (170) is the source device (21) that processes the touch input, the controller (170) can transmit touch data to the source device (21) to perform a control command corresponding to the touch input received on the display (180).

[0091] Touch data may include data related to touch, such as coordinates of a touch input received on the screen of the display (180), and a touch type of the touch input. The touch type may be either a touch down type or a touch up type.

[0092] The source device (21) can receive touch data from the sink device (23) through the external device interface (135). Based on the received touch data, the source device (21) can perform an operation corresponding to the touch data at a location matching the coordinates of the touch input.

[0093] Meanwhile, when the processing subject of the touch input received on the display (180) is determined to be the source device (21), if the USB connection of the source device (21) is disconnected, the output of the video signal is abnormal, or the external input is switched to an input other than the USB input using a remote control device for controlling the sink device (23), the processing subject may be switched back to the sink device (23).

[0094] If the video output is abnormal, it may be because the source device (21) is turned off.

[0095] If the controller (170) of the sink device (23) determines that the processing subject of the touch input is the sink device (23) (S307), it can perform an operation corresponding to the touch data corresponding to the touch input (S311).

[0096] If the controller (170) determines that the processing subject of the touch input is the sink device (23), it can block touch data corresponding to the touch input from being transmitted to the source device (21).

[0097] The action corresponding to the touch data may be any one of selecting a UI element on the display (180), controlling playback of a video being displayed, or executing an application, but these are only examples.

[0098] FIG. 4 is a flowchart illustrating a process of determining a processing subject of a touch input based on detection of a specific action when a source device is determined to be a processing subject of a touch input according to an embodiment of the present invention.

[0099] Figure 4 may be an operation performed after step S309 of Figure 3.

[0100] Referring to FIG. 4, the controller (170) of the sink device (23) can determine whether a specific action is detected when the processing subject of the touch input is determined to be the source device (21) (S401).

[0101] A specific action may be a user action of selecting a toggle button displayed on a display (180) of a sink device (23). For example, the controller (170) may receive a control signal for the toggle button from a remote control device (not shown).

[0102] Another example might be a user's voice command indicating an intent to switch the processing entity for a touch input.

[0103] As another example, a specific action may be a specific gesture extracted from a user image captured by a camera if the sync device (23) is equipped with a camera.

[0104] If the controller (170) determines that a specific action has been detected, it can transmit the subsequently received touch input to the HID (Human Interface Device) descriptor (S403).

[0105] The HID descriptor may be a descriptor that determines the type of touch input and the function of the touch input.

[0106] The HID descriptor may be hardware configured separately from the controller (170). The HID descriptor may be software installed in the operating system of the sink device (23).

[0107] The HID descriptor may also be included in the controller (170).

[0108] If the controller (170) determines that a specific action has been detected, it can replicate the received touch input and transmit it to the HID descriptor.

[0109] The HID descriptor can determine whether the touch input is a first type of input (S405).

[0110] The HID descriptor can determine whether a touch input is a first type input or a second type input.

[0111] The first type of input may be an input for menu control on the operating system installed in the sink device (23). The operating system installed in the sink device (23) may be WebOS.

[0112] The second type of input may be any input other than the first type of input. That is, the second type of input may be an input for control other than menu control on the operating system installed on the sink device (23).

[0113] If the controller (170) determines that the touch input is a first type of input, it can re-switch the processing subject of the touch input from the source device (21) to the sink device (23) (S407).

[0114] If the touch input is determined to be a first type of input, the HID descriptor can transmit information indicating that the touch input is of the first type to the controller (170).

[0115] The controller (170) may not transmit the received touch input to the source device (21). That is, the controller (170) may process the received touch input on its own.

[0116] The HID descriptor can maintain the processing subject of the touch input as the source device (21) when the touch input is determined to be a second type of input (S409) (S411).

[0117] If the controller (170) determines that the touch input is a second type of input, the controller (170) can maintain the processing subject of the touch input as the source device (21). If the controller (170) determines that the touch input is a second type of input, the controller (170) can transmit touch data or a touch command corresponding to the touch input to the source device (21).

[0118] The source device (21) can perform an operation corresponding to the touch data based on the received touch data.

[0119] Meanwhile, if a specific action is detected again after step S407 or S411, the controller (170) may stop duplicating subsequent received touch inputs to the HID descriptor. At the same time, the controller (170) may fix the processing subject of the touch input to the sink device (23).

[0120] That is, a specific action may be an action that serves as a reference for switching the processing subject of the touch input to the source device (21) or the sink device (23) or fixing it to the sink device (23).

[0121] FIG. 5 is a flowchart illustrating a process of determining a processing subject of a touch input based on detection of a specific action when a source device is determined to be a processing subject of a touch input according to another embodiment of the present invention.

[0122] FIG. 5 may be an operation performed after step S309 of FIG. 3.

[0123] Referring to FIG. 5, the controller (170) of the sink device (23) can determine whether a specific action is detected when the processing subject of the touch input is determined to be the source device (21) (S501).

[0124] A specific action may be a user action of selecting a toggle button displayed on a display (180) of a sink device (23). For example, the controller (170) may receive a control signal for the toggle button from a remote control device (not shown).

[0125] Another example might be a user's voice command indicating an intent to switch the processing entity for a touch input.

[0126] As another example, a specific action may be a specific gesture extracted from a user image captured by a camera if the sync device (23) is equipped with a camera.

[0127] If the controller (170) determines that a specific action has been detected, it can switch the processing subject of the touch input from the source device (21) to the sink device (23) (S503).

[0128] The controller (170) can recognize a specific action as a trigger for switching the processing subject of the touch input.

[0129] If the controller (170) determines that a specific action is not detected, it can maintain the processing subject of the touch input as the source device (21) (S505).

[0130] In this way, according to the embodiment of FIG. 5, the sink device (23) can easily change the processing subject of the touch input as it detects a specific action.

[0131] FIG. 6A and FIG. 6B are drawings for explaining the horizontal mode and vertical mode of a stand-alone display device according to an embodiment of the present disclosure.

[0132] Referring to FIGS. 6a and 6b, a stand-type display device (100) is illustrated.

[0133] A shaft (103) and a stand base (105) can be connected to the display device (100).

[0134] The shaft (103) can connect the display device (100) and the stand base (105). The shaft (103) can extend vertically.

[0135] The lower end of the shaft (103) can be connected to the edge of the stand base (105).

[0136] The lower end of the shaft (103) can be rotatably connected to the periphery of the stand base (105).

[0137] The display device (100) and shaft (103) can rotate around a vertical axis with respect to the stand base (105).

[0138] The upper part of the shaft (103) can be connected to the rear of the display device (100).

[0139] The stand base (105) can serve to support the display device (100).

[0140] The display device (100) may be configured to include a shaft (103) and a stand base (105).

[0141] The display device (100) can rotate around the point where the upper part of the shaft (103) and the rear part of the display (180) meet.

[0142] FIG. 6a may show that the display (180) operates in a landscape mode in which the horizontal length is greater than the vertical length, and FIG. 6b may show that the display (180) operates in a landscape mode in which the vertical length is greater than the horizontal length.

[0143] Users can carry and move the stand-type display device. In other words, unlike fixed devices, the stand-type display device offers enhanced mobility, and users are not restricted by its placement location.

[0144] According to one embodiment of the present disclosure, the above-described method can be implemented as processor-readable code on a medium in which a program is recorded. Examples of processor-readable media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, and optical data storage devices.

[0145] The display device described above is not limited to the configuration and method of the embodiments described above, and the embodiments may be configured by selectively combining all or part of each embodiment so that various modifications can be made.

Claims

1. In sink equipment, A display capable of receiving touch input; An external device interface that receives video signals from a source device via the USB (Universal Serial Bus) standard; and A controller that detects a connection with the source device through the USB standard and switches the processing subject of the touch input received through the display from the sink device to the source device when the display outputs the video signal. Sink device.

2. In paragraph 1, The above controller When the connection between the source device and the USB standard is disconnected, the processing subject of the touch input is re-switched from the source device to the sink device. Sink device.

3. In paragraph 1, The above controller When the power of the above source device is turned off, the processing subject of the above touch input is re-switched from the above source device to the above sink device. Sink device.

4. In paragraph 1, The above controller When the external input is switched from USB input to another input, the processing subject of the touch input is switched again from the source device to the sink device. Sink device.

5. In paragraph 1, The above controller When a specific action is detected, the processing entity is re-switched from the source device to the sink device. Sink device.

6. In paragraph 1, The above controller When a specific action is detected and the touch input is of the first type, the processing entity is re-switched from the source device to the sink device; If the above specific action is detected and the touch input is of the second type, the processing entity is maintained as the source device. Sink device.

7. In paragraph 6, The above first type is This is a type for menu control of the operating system installed on the above sink device, The second type above All types other than the above first type Sink device.

8. In paragraph 1, The above USB specifications are USB-C DP Alt (USB-C DisplayPort Alternate) Sink device.

9. A method for operating a sink device having a display capable of receiving touch input and an external device interface for receiving a video signal from a source device through a USB (Universal Serial Bus) standard, A step of detecting a connection with the above source device via the above USB standard; A step of receiving the above video signal; and In case the display outputs the video signal, a step of switching the processing subject of the touch input received through the display from the sink device to the source device is included. How the sink device works.

10. In paragraph 9, If the connection between the source device and the USB standard is disconnected, the step of re-switching the processing subject of the touch input from the source device to the sink device is further included. How the sink device works.

11. In paragraph 9, If the power of the source device is turned off, the step of re-switching the processing subject of the touch input from the source device to the sink device is further included. How the sink device works.

12. In paragraph 9, If the external input is switched from a USB input to another input, the step of re-switching the processing subject of the touch input from the source device to the sink device is further included. How the sink device works.

13. In paragraph 9, Further comprising the step of re-switching the processing entity from the source device to the sink device when a specific action is detected. How the sink device works.

14. In paragraph 9, a step of re-switching the processing entity from the source device to the sink device when a specific action is detected and the touch input is of the first type; and Further comprising the step of maintaining the processing entity as the source device when the specific action is detected and the touch input is of the second type. How the sink device works.

15. In paragraph 14, The above first type is This is a type for menu control of the operating system installed on the above sink device, The second type above All types other than the above first type How the sink device works.

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