Display device and operating method thereof

Abstract

A display device according to an embodiment may include: a display; a communication unit including a communication circuit; a memory to store one or more instructions; and at least one processor for executing one or more instructions wherein the at least one processor, by executing the one or more instructions, transmits image data received from an external device connected to the display device to another display device connected to the display device; identifying whether an operation of transmitting the image data to another display device is being performed based on receiving the power-off signal; turning off the display based on the operation of transmitting the image data to the other display device being performed; entering a power-off standby mode in which an operation of transmitting the image data to another display device is maintained; and switching to the power saving mode based on the operation of transmitting the image data to the other display device ending in the power-off standby mode.

Description

Technical Field

[0001] The present disclosure relates to a display device capable of sending an image received from an external device to another display device and an operation method of the display device. Background Art

[0002] A display device includes a device having a function of displaying an image viewable by a user. A user can watch a broadcast through the display device. The display device displays a broadcast selected by the user from broadcast signals transmitted from a broadcasting station on a display. In addition, a smart television (TV) for providing various contents other than the broadcast function has been provided. The smart TV performs a function of analyzing contents desired by the user and providing the contents to the user without the user's manipulation, rather than being manually operated according to the user's selection.

[0003] In addition, a display device (such as a TV) connected to an external device (such as a set-top box, a Blu-ray disc player, a digital versatile disc (DVD) player, a streaming device, or a home theater) can receive an image from the external device and display the image. In addition, the display device can control the connected external device based on a control signal input to the display, and in particular, can turn off the external device.

[0004] In addition, the display device can send an image signal to another display device and receive an image signal from another display device using a short-range wired / wireless communication network. Summary of the Invention

[0005] A display device according to an exemplary embodiment of the present disclosure may include: a display; a communication unit including a communication circuit; a memory storing one or more instructions; and at least one processor including a processing circuit configured to run the one or more instructions.

[0006] The at least one processor may be configured to run the one or more instructions to control the communication unit to send image data received from an external device connected to the display device to another display device connected to the display device.

[0007] The at least one processor may be configured to run the one or more instructions to identify whether an operation of sending image data to another display device is being performed based on a received power-off signal.

[0008] The at least one processor may be configured to run the one or more instructions to turn off the display and enter a power-off standby mode based on the operation of sending image data to another display device being performed, in which the operation of sending image data to another display device is maintained.

[0009] At least one processor may be configured to run one or more instructions to switch to a power saving mode based on terminating an operation of sending image data to another display device in a power-off standby mode.

[0010] A method of operating a display device according to an exemplary embodiment of the present disclosure may include: sending image data received from an external device connected to the display device to another display device connected to the display device.

[0011] A method of operating a display device according to an exemplary embodiment of the present disclosure may further include: receiving a power-off signal.

[0012] A method of operating a display device according to an exemplary embodiment of the present disclosure may further include: based on receiving the power-off signal, identifying whether an operation of sending image data to another display device is being performed.

[0013] A method of operating a display device according to an exemplary embodiment of the present disclosure may further include: based on an operation of sending image data to another display device being performed, turning off the display and entering a power-off standby mode, in which the operation of sending image data to another display device is maintained.

[0014] A method of operating a display device according to an exemplary embodiment of the present disclosure may further include: switching to a power saving mode based on terminating an operation of sending image data to another display device in the power-off standby mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other aspects, features, and advantages of specific embodiments of the present disclosure will become more apparent from the following detailed description in conjunction with the accompanying drawings, in which: Figure 1 is a diagram showing a first display device according to an embodiment of the present disclosure and a second display device and an external device connected to the first display device; Figure 2 is a signal flow diagram showing an exemplary method of sending an image received from an external device by a first display device to a second display device according to an embodiment of the present disclosure; Figure 3 is a diagram showing an example of a second display device setting an external device connected to a first display device as an external input according to an embodiment of the present disclosure; Figure 4 is a diagram showing an exemplary operation of a first display device sending an external input image to a second display device according to an embodiment of the present disclosure; Figure 5 is a flowchart showing an exemplary method executed by a display device when a shutdown signal is received according to an embodiment of the present disclosure; Figure 6is a diagram showing an example operation of sending an external input image from a first display device to a second display device according to an embodiment of the present disclosure; Figure 7 and Figure 8 is a diagram showing an example operation of sending an external input image from a first display device to a second display device according to an embodiment of the present disclosure; Figure 9 is a diagram showing an example operation of controlling power-on / power-off performed by a first display device and a second display device according to an embodiment of the present disclosure; Figure 10 is a diagram showing an example operation of controlling power-on / power-off performed by a first display device and a second display device according to an embodiment of the present disclosure; Figure 11 is a block diagram showing an example configuration of a first display device according to an embodiment of the present disclosure; and Figure 12 is a block diagram showing an example configuration of a display device according to an embodiment of the present disclosure. Detailed Description

[0016] Terms used herein will be briefly described, and then the present disclosure will be described in more detail with reference to the respective drawings below.

[0017] Although the terms used herein are selected from currently widely used general terms in consideration of their functions in the present disclosure, these terms may vary according to the intention of those of ordinary skill in the art, precedent, or the emergence of new technologies. In addition, in a specific case, terms may be arbitrarily selected, and in such a case, the meanings of those terms will be described in detail in the corresponding part of the detailed description. Therefore, the terms used herein are not merely the names of the terms, but are defined based on the meanings of the terms and the overall content of the present disclosure.

[0018] Throughout the disclosure, when a component "includes" a component, it may mean, for example, that as long as there is no particular contrary description, the component may additionally include other components rather than excluding other components. In addition, as used herein, terms such as "...device", "...unit", "...module", etc. represent a unit that performs at least one function or operation, which may be implemented as hardware or software or a combination thereof.

[0019] Hereinafter, various example embodiments of the present disclosure will be described with reference to the drawings. However, the present disclosure may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. To clearly describe the present disclosure, parts not relevant to the description of the present disclosure may be omitted, and similar reference numerals will be assigned to similar elements throughout the disclosure.

[0020] In the present disclosure, the term "user" refers to a person who controls a system, function, or operation, and may include a developer, an administrator, or an installer.

[0021] Furthermore, in the present disclosure, the term "image" or "picture" may refer to a still image, a moving image or video including a plurality of consecutive still images (or frames).

[0022] Figure 1 is a diagram showing a first display device according to an embodiment of the present disclosure, and a second display device and an external device connected to the first display device.

[0023] The first display device 100 and the second display device 200 according to an embodiment of the present disclosure may include a television (TV), but this is only an example, and may be implemented in various forms including a display. For example, the first display device 100 and the second display device 200 may be implemented as various electronic devices, such as but not limited to a mobile phone, a tablet personal computer (PC), a digital camera, a video camera, a laptop computer, a tablet PC, a desktop computer, an e-book terminal, a digital broadcast terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, an MP3 player, or a wearable device.

[0024] Furthermore, the first display device 100 and the second display device 200 may be stationary or mobile, and may include a digital broadcast receiver capable of receiving digital broadcasts. In addition, the first display device 100 and the second display device 200 may be implemented as, for example but not limited to, a flat display device, a curved display device with a curved screen, or a flexible display device with an adjustable curvature. The output resolution of the first display device 100 and the second display device 200 may include, for example but not limited to, high definition (HD) resolution, full HD resolution, ultra HD resolution, or a resolution higher than ultra HD resolution.

[0025] The external device 300 according to an embodiment of the present disclosure may include a device for providing content to a display device by reproducing the content. For example, the content may refer to multimedia content, and may include images, videos, audio, text, games, applications, etc., but is not limited thereto.

[0026] The external device 300 according to an embodiment of the present disclosure may include, for example but not limited to, a set-top box, a Blu-ray Disc player, a digital versatile disc (DVD) player, a game device, a digital camera, a video camera, a streaming device, a home theater, etc. The external device 300 includes various electronic devices, such as but not limited to a smart phone, a tablet PC, a mobile terminal, a video phone, an e-book reader, a desktop PC, a laptop PC, a netbook computer, a PDA, a PMP, a navigation device, an MP3 player, a wearable device, etc.

[0027] According to an embodiment of the present disclosure, the first display device 100 and the external device 300 can be connected to each other through wired communication or wireless communication. For example but not limited to, the first display device 100 can be connected to the external device 300 through a High-Definition Multimedia Interface (HDMI) port, a Mobile High-Definition Link (MHL) port, a Universal Serial Bus (USB) port, a DisplayPort (DP) port, a Thunderbolt port, a Video Graphics Array (VGA) port, a Red-Green-Blue (RGB) port, a D-Subminiature (D-SUB), a Digital Visual Interface (DVI) port, a component jack, a PC port, etc. However, the present disclosure is not limited thereto, and the first display device 100 and the external device 300 can be connected to each other through short-range wireless communication (such as Wireless Local Area Network (LAN) (e.g., Wi-Fi) or Bluetooth). The first display device 100 and the external device 300 can use the communication between them to send video, audio, and additional information to each other or receive video, audio, and additional information from each other.

[0028] In addition, in various exemplary embodiments of the present disclosure, an example in which the first display device 100 and the external device 300 are connected to each other through HDMI communication (HDMI cable) will be described.

[0029] The first display device 100 and the external device 300 connected to each other through an HDMI cable can use, for example but not limited to, a minimized transmission differential signal (TMDS) channel, a display data channel (DDC), a consumer electronics control (CEC), etc. to send data and information to each other or receive data and information from each other. For example, the TMDS channel can be used to transmit video data and audio data. In addition, the DDC can be used to send the extended display identification data (EDID) information of the first display device 100 (which can be a receiving device) (such as information indicating a display product type, resolution, screen size, brightness, etc. that indicate display characteristics) to the external device 300 (which is a source device). In addition, the first display device 100 and the external device 300 can control each other through CEC.

[0030] The external device 300 according to an embodiment of the present disclosure can send image data (or an image signal) to the first display device 100.

[0031] According to an embodiment of the present disclosure, the first display device 100 and the second display device 200 can be connected to each other through wired communication or wireless communication.

[0032] For example but not limited to, the first display device 100 and the second display device 200 can be connected to each other through short-range wireless communication (such as Wireless LAN (e.g., Wi-Fi), Bluetooth, etc.). The first display device 100 and the external device 300 can use the communication between them to send video, audio, and additional information to each other or receive video, audio, and additional information from each other.

[0033] According to an embodiment of the present disclosure, a first display device 100 can receive image data from an external device 300. The first display device 100 can send the received image data to a second display device 200. In various exemplary embodiments of the present disclosure, examples will be described in which the first display device 100 is a source device and the second display device 200 is a receiving device.

[0034] The first display device 100 can encode the received image data and send the encoded image data to the second display device 200. Accordingly, the second display device 200 can receive and display the image data output from the external device 300 without directly connecting the external device 300 to the second display device 200.

[0035] For example, when the first display device 100 and the second display device 200 can be located in different spaces and the external device 300 is connected to the first display device 100, the second display device 200 can receive the image data output from the external device 300 through the first display device 100 and display the received image data.

[0036] In addition, when the first display device 100 according to an embodiment of the present disclosure is powered off while performing an operation of sending the image data of the external device 300 to the second display device 200, the viewing of the external image by the user of the second display device 200 may be inadvertently terminated.

[0037] For example, when the first display device 100 and the external device 300 are interconnected through an HDMI cable, the first display device 100 and the external device 300 can be mutually controlled through the above-mentioned HDMI CEC. For example, when the first display device 100 receives a shutdown signal, the first display device 100 can send the shutdown signal to the external device 300 connected thereto. Accordingly, the image data of the external device 300 may not be sent to the second display device 200.

[0038] Accordingly, even when the first display device 100 according to an embodiment of the present disclosure receives a shutdown signal while performing an operation of sending the image data of the external device 300 to the second display device 200, it is possible to control the first display device 100 to continuously perform an operation of sending the image data of the external device 300 to the second display device 200 without disconnecting the power supplies of the first display device 100 and the external device 300.

[0039] Hereinafter, a more detailed description will be provided with reference to the accompanying drawings.

[0040] Figure 2 is a signal flow diagram showing an example method of sending an image received from an external device by a first display device according to an embodiment of the present disclosure.

[0041] Refer to Figure 2 According to an embodiment of the present disclosure, the first display device 100 can be connected to an external device 300 (S210).

[0042] For example, the first display device 100 can be connected to the external device 300 through an HDMI port, an MHL port, a USB port, a DP port, a Thunderbolt port, a VGA port, an RGB port, a D-SUB, a DVI port, a component jack, a PC port, etc. However, the present disclosure is not limited thereto, and the first display device 100 and the external device 300 can be connected to each other through short-range wireless communication (such as wireless LAN (e.g., Wi-Fi) or Bluetooth, etc.). The first display device 100 and the external device 300 can use the communication between them to send video, audio, and additional information to each other or receive video, audio, and additional information from each other.

[0043] According to an embodiment of the present disclosure, the first display device 100 and the second display device 200 can be communicatively connected to each other using at least one communication method (S220).

[0044] For example, the first display device 100 and the second display device 200 can be connected to each other through short-range wireless communication (such as wireless LAN (e.g., Wi-Fi) or Bluetooth, etc.). The first display device 100 and the external device 300 can use the communication between them to send video, audio, and additional information to each other or receive video, audio, and additional information from each other.

[0045] According to an embodiment of the present disclosure, the second display device 200 can perform a connection with any one of the external devices connected to the first display device 100. The connection between the second display device 200 and the external device 300 can refer to, for example, a connection through the first display device 100, rather than a direct connection.

[0046] The second display device 200 can request an external input image from the first display device 100 (S230). The external input image can refer to, for example, an image received from the external device 300.

[0047] In response to the request for the external input image received from the second display device 200, the first display device 100 can request the external input image from the external device 300 (S240).

[0048] According to an embodiment of the present disclosure, the external device 300 can send image data to the first display device 100 (S250).

[0049] The first display device 100 can encode the image data received from the external device 300 (S260).

[0050] For example, the first display device 100 can reduce the amount of information by encoding the image data received from the external device 300. For example, the encoding can include, for example but not limited to, the following operations: predicting the image data to generate prediction data, generating residual data corresponding to the difference between the image data and the prediction data, transforming the residual data as a spatial domain component into a frequency domain component, quantizing the residual data transformed into the frequency domain component, and entropy encoding the quantized residual data. The encoding can be implemented by using any one of the image processing methods using frequency conversion, such as, for example but not limited to, MPEG-2, H.264 Advanced Video Coding (AVC), MPEG-4, High Efficiency Video Coding (HEVC), VC-1, VP8, VP9, or AOMedia Video 1 (AV1). However, the present disclosure is not limited thereto.

[0051] The first display device 100 can send the encoded image data to the second display device 200 (S270).

[0052] For example, the first display device 100 can send the encoded image data to the second display device 200 in the form of a bitstream.

[0053] The second display device 200 can decode the image data received from the first display device 100 and display the external input image on the display (S280).

[0054] For example, the decoding can include the following operations: entropy decoding the image data to produce quantized residual data, dequantizing the quantized residual data, transforming the residual data as a frequency domain component into a spatial domain component, generating prediction data, and reconstructing the image data using the prediction data and the residual data. The decoding can be implemented by an image reconstruction method that corresponds to any one of the image compression methods using frequency conversion used in the encoding, such as, for example but not limited to, MPEG-2, H.264, MPEG-4, HEVC, VC-1, VP8, VP9, or AV1.

[0055] Figure 3 is a diagram showing an example in which a second display device according to an embodiment of the present disclosure sets an external device connected to a first display device as an external input.

[0056] Refer to Figure 3 According to an embodiment of the present disclosure, the second display device 200 can display a menu for setting an external device based on a user input.

[0057] For example, the second display device 200 may receive a control signal or a control command corresponding to a user input from a control device. The control device may include, for example but not limited to, a remote control, a keyboard, a mouse, etc., and may send data, information, signals, etc. to the second display device 200 and receive data, information, signals, etc. from the second display device 200 through wired communication or wireless communication. However, the present disclosure is not limited thereto.

[0058] The menu for setting an external input may include a list of connectable external devices. The list of external devices may include external devices connected to the second display device 200, or external devices connected to the first display device 100 connected to the second display device 200. For example, the list of external devices may include a first item 310 corresponding to a first external device connected to the second display device 200, a second item 320 corresponding to a second external device connected to the second display device 200, a third item 330 corresponding to a third external device connected to the first display device 100, and a fourth item 340 corresponding to a fourth external device connected to the first display device 100. In addition, the list of external devices may include external devices connected to other display devices other than the first display device 100, which are connected to the second display device 200.

[0059] When the second display device 200 receives an input for selecting any one of a plurality of items included in the external device list, the second display device 200 may receive an external input image from the external device corresponding to the selected item and display the received external input image.

[0060] For example, when the first item 310 or the second item 320 is selected, the second display device 200 may receive an image from the first external device or the second external device connected to the second display device 200 and display the received image.

[0061] When the third item 330 or the fourth item 340 is selected, the second display device 200 may receive an image corresponding to the third external device (third external input image) or an image corresponding to the fourth external device (fourth external input image) through the first display device 100.

[0062] The following will refer to Figure 4 A more detailed description will be given thereof.

[0063] Figure 4 is a diagram showing an example operation of sending an external input image from a first display device to a second display device according to an embodiment of the present disclosure.

[0064] According to an embodiment of the present disclosure, the second display device 200 may request an external input image from the first display device 100 (S410).

[0065] For example, as described above with reference to Figure 3 When the second display device 200 receives an input for selecting the third external device or the fourth external device connected to the first display device 100 in the external input setting menu, the second display device 200 may request an external input image from the first display device 100.

[0066] The first display device 100 may receive image data corresponding to the external input image requested by the second display device 200 from the external device 300 (S420). The first display device 100 may encode the image data received from the external device 300 and send the encoded image data to the second display device 200 (S430).

[0067] When the first display device 100 according to an embodiment of the present disclosure is powered off or in a power saving mode and receives a request for an external input image from the second display device 200, the first display device 100 may start a process and power to send the external input image to the second display device 200.

[0068] In addition, the first display device 100 may perform an operation of sending an external input image to the second display device 200 in a state where the display of the first display device 100 is turned on or off.

[0069] The second display device 200 according to an embodiment of the present disclosure may display an external input image received from the first display device 100.

[0070] Figure 5 is a flowchart illustrating an example method performed by a display device when receiving a shutdown signal according to an embodiment of the present disclosure.

[0071] Power-off according to an embodiment of the present disclosure may refer to turning off a display device that is reproducing image data. Power-off may also be referred to as shutdown.

[0072] The first display device 100 according to an embodiment of the present disclosure may receive a shutdown signal (S510).

[0073] For example, the first control device for controlling the first display device 100 may include a power on / off button, and when the power on / off button is pressed, a shutdown signal may be sent to the first display device 100. The first control device may include a microphone for receiving a voice command corresponding to "power-off", and when receiving a voice command corresponding to "power-off", a shutdown signal may be sent to the first display device 100. However, the present disclosure is not limited thereto.

[0074] The first control device according to an embodiment of the present disclosure may use an infrared (IR) communication method to send a shutdown signal to the first display device 100. However, the present disclosure is not limited thereto, and the first control device may use, for example but not limited to, wireless LAN (e.g., Wi-Fi), Bluetooth, Bluetooth Low Energy (BLE), ultrasonic waves, Zigbee, etc. to send a control signal to the first display device.

[0075] The shutdown signal may correspond to a command to change the operation mode of the display device from the normal mode to the power saving mode or the standby mode.

[0076] In addition, when switching from the normal mode to the power saving mode, the power supplied to a memory (not shown) of the first display device 100 may be maintained, and the data stored in the memory may also be maintained even after switching to the power saving mode.

[0077] When the first display device 100 according to an embodiment of the present disclosure receives the shutdown signal, the first display device 100 may identify whether the first display device 100 is performing an operation of sending an external input image to another display device (S520).

[0078] For example, the first display device 100 may perform the following operations: encoding image data received from an external device 300 connected to the first display device 100, and sending the encoded image data to a second display device 200 connected to the first display device 100.

[0079] When performing the operation of sending an external input image to another display device ( "Yes" in operation S520), the first display device 100 according to an embodiment of the present disclosure may turn off the display (S530). Turning off the display may mean changing the display screen to a black screen.

[0080] In addition, the first display device 100 may continuously perform the operation of sending an external input image to another display device without stopping.

[0081] The first display device 100 may monitor the status of the operation of sending an external input image to another display device (S540).

[0082] In addition, when the first display device 100 according to an embodiment of the present disclosure is not performing the operation of sending an external input image to another display device ( "No" in operation S520), or when the operation of sending an external input image to another display device is terminated, the first display device 100 may send a termination signal to the external device 300 (S550).

[0083] For example, when the first display device 100 and the external device 300 are interconnected via an HDMI cable, the first display device 100 can use HDMI-CEC to control the external device 300. The first display device 100 can send a shutdown signal to the external device 300 via HDMI-CEC to power off the external device 300.

[0084] The first display device 100 according to an embodiment of the present disclosure can operate in a power-saving mode or a standby mode (S560).

[0085] The power-saving mode may refer to, for example, an operating state in which power is not supplied to the processor. For example, when the scheduling of the process scheduler is stopped, the operation of the processor can be stopped.

[0086] For example, the first display device 100 can store information about the operation being performed by the first display device 100 in the memory. In the power-saving mode, power supplied to the memory of the first display device 100 is maintained. Therefore, even when the first display device 100 switches to the power-saving mode, the data stored in the memory can be maintained.

[0087] In addition, the first display device 100 can include a microcomputer, and the microcomputer can receive power so as to remain on even in the power-saving mode. When the microcomputer receives a power-on signal (which can also be referred to as an on signal) in the standby mode, power can be supplied to the processor, and the processor can operate in the normal mode. For example, the processor can use the data stored in the memory to restore the operating state of the display device to the state before switching to the power-saving mode.

[0088] Figure 6 is a diagram showing an example operation of sending an external input image from the first display device according to an embodiment of the present disclosure to the second display device.

[0089] Refer to Figure 6 , the first display device 100 according to an embodiment of the present disclosure can be connected to the external device 300 via an input / output interface. In addition, the first display device 100 can be connected to the second display device 200 via wired communication or wireless communication.

[0090] The second display device 200 according to an embodiment of the present disclosure can set the external device 300 connected to the first display device 100 as a source device via an external input setting menu. When the external device 300 is set as the source device, the second display device 200 can request an external input image corresponding to the external device 300 from the first display device 100.

[0091] In response to the request received from the second display device 200, the first display device 100 can receive image data from the external device 300.

[0092] The first display device 100 can display the image data received from the external device 300, or can separately display the image data received from another external device connected to the first display device 100 and the image data received from the external device 300.

[0093] The first display device 100 can encode the image data received from the external device 300 and send the encoded image data to the second display device 200.

[0094] Therefore, the second display device 200 can decode the image data received from the first display device 100 and display the decoded image data on the display.

[0095] The first display device 100 can receive a shutdown signal from the first control device while performing the operation of sending the image data to the second display device 200.

[0096] When receiving the shutdown signal, the first display device 100 can only turn off the display and keep the operation of sending the image data to the second display device 200 without stopping.

[0097] The first display device 100 can monitor whether the operation of sending the image data to the second display device 200 is being continuously executed.

[0098] Figure 7 and Figure 8 is a diagram showing an example operation of sending an external input image from the first display device according to an embodiment of the present disclosure to the second display device.

[0099] Refer to Figure 7 , the second display device 200 according to an embodiment of the present disclosure can change the source device while receiving and displaying the external input image corresponding to the external device 300 from the first display device 100, as Figure 6 shown and as previously referred to Figure 6 described. For example, the second display device 200 can use an external input setting menu to switch to another source device. Another source device (not shown) can be a source device directly connected to the second display device 200.

[0100] The second display device 200 can send a request to the first display device 100 to stop sending the external input image. When the first display device 100 receives the request to stop sending the external input image from the second display device 200, the first display device 100 can stop or terminate the operations of receiving image data from the external device 300, encoding the received image data, and sending the encoded image data to the second display device 200.

[0101] When stopping sending an external input image to the second display device 200, the first display device 100 may send a shutdown signal to the external device 300 and enter a power-saving mode.

[0102] The communication connection between the first display device 100 and the second display device 200 may be maintained without being disconnected. When the communication connection between the first display device 100 and the second display device 200 is maintained, when the second display device 200 requests an external input image again, the first display device 100 may send the external input image to the second display device 200.

[0103] When the source device changed by the second display device 200 is a second external device that is also connected to the first display device 100, the first display device 100 may receive image data from the second external device without entering the power-saving mode. The first display device 100 may encode the image data received from the second external device and send the encoded image data to the second display device 200.

[0104] In addition, referring to Figure 8 , the second display device 200 according to an embodiment of the present disclosure may receive a shutdown signal from a second control device that controls the second display device 200 while receiving and displaying image data corresponding to the external device 300 from the first display device 100, as Figure 6 shown and as referred to above in Figure 6 described.

[0105] When the second display device 200 receives the shutdown signal, the second display device 200 may send information indicating that the second display device 200 has been powered off to the first display device 100. The second display device 200 may enter a power-saving mode.

[0106] When the first display device 100 receives the information indicating that the second display device 200 has been powered off from the second display device 200, the first display device 100 may stop or terminate operations of receiving image data from the external device 300, encoding the received image data, and sending the encoded image data to the second display device 200.

[0107] When stopping sending image data to the second display device 200, the first display device 100 may send a shutdown signal to the external device 300 and enter a power-saving mode. At this time, the communication connection between the first display device 100 and the second display device 200 may be disconnected.

[0108] Figure 9 is a diagram showing an example operation of controlling power-on / power-off performed by a first display device and a second display device according to an embodiment of the present disclosure.

[0109] Referring to Figure 9, according to an embodiment of the present disclosure, the second display device 200 can be connected to the first display device 100, and the first display device 100 can be connected to an external device 300.

[0110] According to an embodiment of the present disclosure, the second display device 200 can request an external input image from the first display device 100 that has been powered off through an external input setting.

[0111] When the first display device 100 receives a request for an external input image from the second display device 200, the first display device 100 can power itself on. The first display device 100 can turn on the display and request an external input image from the external device 300. The first display device 100 can receive image data from the external device 300 and then send the image data to the second display device 200.

[0112] The second display device 200 can receive a shutdown signal while receiving image data from the first display device 100. The second display device 200 can send information indicating that the second display device 200 has been powered off to the first display device 100.

[0113] When the first display device 100 receives information indicating that the second display device 200 has been powered off from the second display device 200, the first display device 100 can stop or terminate operations of receiving image data from the external device 300, encoding the received image data, and sending the encoded image data to the second display device 200.

[0114] When stopping sending image data, the first display device 100 can send a shutdown signal to the external device 300 and power itself off.

[0115] On the other hand, when a user input is received after turning on the first display device 100 through the second display device 200, or when a user is detected around the first display device 100, the first display device 100 can remain powered on without powering off. However, the present disclosure is not limited thereto.

[0116] Figure 10 It is a diagram showing an example operation of controlling power on / off performed by the first display device and the second display device according to an embodiment of the present disclosure.

[0117] Refer to Figure 10 , according to an embodiment of the present disclosure, the second display device 200 can be connected to the first display device 100, and the first display device 100 can be connected to an external device 300.

[0118] According to an embodiment of the present disclosure, the second display device 200 can request an external input image from the first display device 100 that has been powered off through an external input setting.

[0119] When the first display device 100 receives a request for an external input image from the second display device 200, the first display device 100 may power itself on. At this time, the first display device 100 may request an external input image from the external device 300 while keeping the display off. The first display device 100 may receive image data from the external device 300 and then send the image data to the second display device 200.

[0120] The second display device 200 may receive a shutdown signal while receiving the image data from the first display device 100. The second display device 200 may send information indicating that the second display device 200 has been powered off to the first display device 100.

[0121] When the first display device 100 receives information indicating that the second display device 200 has been powered off from the second display device 200, the first display device 100 may stop or terminate operations of receiving image data from the external device 300, encoding the received image data, and sending the encoded image data to the second display device 200.

[0122] When stopping the transmission of image data, the first display device 100 may send a shutdown signal to the external device 300 and power itself off.

[0123] On the other hand, when, after turning on the first display device 100 through the second display device 200, the first display device 100 receives an on signal from the first control device that controls the first display device 100, the first display device 100 may remain powered on without powering off. However, the present disclosure is not limited thereto.

[0124] Figure 11 It is a block diagram showing an example configuration of a first display device according to an embodiment of the present disclosure.

[0125] Referring to Figure 11 , the first display device 100 according to an embodiment of the present disclosure may include a communication unit (for example, including a communication circuit) 110, a processor (for example, including a processing circuit) 120, a memory 130, a display 140, and an input / output interface (for example, including an interface circuit) 150.

[0126] The communication unit 110 according to an embodiment of the present disclosure may include various communication circuits, and send data or signals to an external device (e.g., the second display device 200 or the first control device) or a server and receive data or signals from the external device (e.g., the second display device 200 or the first control device) or the server. For example but not limited to, the communication unit 110 may include a Wi-Fi module, a Bluetooth module, an IR communication module, a wireless communication module, a LAN module, an Ethernet module, a wired communication module, etc. Each communication module may be implemented as at least one hardware chip including various communication circuits.

[0127] The Wi-Fi module and the Bluetooth module perform communication using the Wi-Fi scheme and the Bluetooth scheme, respectively. When using the Wi-Fi module or the Bluetooth module, various connection information (such as a service set identifier (SSID) or a session key) may be first sent and received, and then various information may be sent and received after establishing a communication connection using the connection information. The wireless communication module may include at least one communication chip configured to perform communication according to various wireless communication standards such as Zigbee, third generation (3G), 3rd Generation Partnership Project (3GPP), Long Term Evolution (LTE), LTE-Advanced (LTE-A), fourth generation (4G), fifth generation (5G), etc.

[0128] The communication unit 110 according to an embodiment of the present disclosure may receive a request for an externally input image from the second display device 200 according to an embodiment of the present disclosure and send the externally input image to the second display device 200.

[0129] The communication unit 110 according to an embodiment of the present disclosure may receive a control signal or a control command from the first control device. For example, the communication unit 110 may include an IR module capable of sending signals to and receiving signals from the first control device according to the IR communication standard. Specifically, the communication unit 110 may receive a control signal or a control command corresponding to a user input (e.g., an input of a key or a button of the control device) from the first control device.

[0130] The processor 120 according to an embodiment of the present disclosure may include various processing circuits. For example, as used herein (including the claims), the term "processor" may include various processing circuits including at least one processor, wherein one or more of the at least one processor may be configured to perform various functions described herein. Additionally, the at least one processor may include a combination of processors that perform various recited / disclosed functions. Additionally, the processor 120 controls the overall operation of the first display device 100 and the signal flow between the internal components of the first display device 100, and processes data.

[0131] The processor 120 may include a single-core, dual-core, triple-core, quad-core, or a core corresponding to a multiple thereof. In addition, the processor 120 may include multiple processors. For example, the processor 120 may be implemented as a main processor (not shown) and a sub-processor (not shown) operating in a sleep mode.

[0132] In addition, the processor 120 may include at least one of, for example but not limited to, a central processing unit (CPU), a graphics processing unit (GPU), or a video processing unit (VPU). According to an embodiment of the present disclosure, the processor 120 may be implemented as, for example but not limited to, a system-on-chip (SoC) integrating at least one of a CPU, a GPU, or a VPU. The processor 120 may also include a neural processing unit (NPU).

[0133] The memory 130 according to an embodiment of the present disclosure may store various data, programs, or applications for driving and controlling the first display device 100.

[0134] In addition, the program stored in the memory 130 may include one or more instructions. The program (e.g., one or more instructions) or application stored in the memory 130 may be run by the processor 120.

[0135] The processor 120 according to an embodiment of the present disclosure may control the input / output interface 150 such that the first display device 100 is connected to an external device 300. In addition, the processor 120 may control the communication unit 110 such that the first display device 100 and the second display device 200 are communicatively connected to each other.

[0136] When the processor 120 receives a request for an external input image corresponding to the external device 300 from the second display device 200, the processor 120 may request the external input image from the external device 300.

[0137] The processor 120 may encode the image data received from the external device 300. For example, the processor 120 may perform encoding of the image data using any one of image processing methods utilizing frequency conversion, such as MPEG-2, H.264 AVC, MPEG-4, HEVC, VC-1, VP8, VP9, or AV1. However, the present disclosure is not limited thereto.

[0138] The processor 120 may control the communication unit 110 to send the encoded image data to the second display device 200.

[0139] When the first display device 100 is powered off or in a power-saving mode and receives a request for an external input image from the second display device 200, the processor 120 according to an embodiment of the present disclosure may start a process and power to send the external input image to the second display device 200.

[0140] In addition, the processor 120 may perform an operation of sending an external input image to the second display device 200 in a state where the display 140 is turned on or off.

[0141] When the processor 120 according to an embodiment of the present disclosure receives a shutdown signal, the processor 120 may identify whether an operation of sending an external input image to another display device is being performed.

[0142] When an operation of sending an external input image to another display device is being performed, the processor 120 according to an embodiment of the present disclosure may turn off the display 140. Here, turning off the display 140 may mean changing the display screen to a black screen.

[0143] In addition, the processor 120 may continuously perform the operation of sending an external input image to another display device without stopping.

[0144] The processor 120 may monitor the state of the operation of sending an external input image to another display device.

[0145] When an operation of sending an external input image to another display device is not being performed, or when the operation of sending an external input image to another display device is terminated, the processor 120 according to an embodiment of the present disclosure may control the input / output interface 150 to send a termination signal to the external device 300. For example, when the first display device 100 and the external device 300 are interconnected via an HDMI cable, the processor 120 may control the external device 300 using HDMI-CEC. The processor 120 may power off the external device 300 by sending a shutdown signal to the external device 300 using HDMI-CEC.

[0146] In addition, the processor 120 according to an embodiment of the present disclosure may send a shutdown signal to other external devices connected to the first display device 100 other than the external device 300. However, the present disclosure is not limited thereto.

[0147] The processor 120 according to an embodiment of the present disclosure may switch to a power saving mode. For example, the processor 120 may store information about the operation being performed by the processor 120 in the memory 130. In addition, the processor 120 may perform control to maintain the power supplied to the memory 130 so that the data stored in the memory 130 is maintained even when switching to the power saving mode.

[0148] When a request to stop sending an external input image is received from the second display device 200, the processor 120 according to an embodiment of the present disclosure may stop or terminate the operations of receiving image data from the external device 300, encoding the received image data, and sending the encoded image data to the second display device 200.

[0149] When receiving information indicating that the second display device 200 has been powered off from the second display device 200, the processor 120 according to an embodiment of the present disclosure may stop or terminate operations of receiving image data from an external device 300, encoding the received image data, and transmitting the encoded image data to the second display device 200.

[0150] When stopping sending an external input image to the second display device 200, the processor 120 according to an embodiment of the present disclosure may send a shutdown signal to the external device 300 and enter a power saving mode.

[0151] The display 140 according to an embodiment of the present disclosure may convert an image signal, a data signal, an on-screen display (OSD) signal, a control signal, etc., that have been processed by the processor 120 to generate a driving signal. The display 140 may be implemented as, for example but not limited to, a plasma display panel (PDP), a liquid crystal display (LCD), an organic light emitting diode (OLED), a flexible display, a three-dimensional (3D) display, etc. In addition, the display 140 may be configured as a touch screen to be used as both an output device and an input device.

[0152] The input / output interface 150 according to an embodiment of the present disclosure may include various interface circuits and receive video (e.g., moving images), audio (e.g., voice or music), and additional information (e.g., an electronic program guide (EPG)) from the outside of the first display device 100. The input / output interface 150 may include any one of an HDMI port, an MHL port, a USB port, a DP port, a Thunderbolt port, a VGA port, an RGB port, a D-SUB port, a DVI port, a component jack, and a PC port.

[0153] Figure 12 is a block diagram showing an example configuration of a display device according to an embodiment of the present disclosure.

[0154] Referring to Figure 12 , Figure 12 The display device 1200 may be an example of the first display device 100 or the second display device 200 described above with reference to Figures 1 to 11 Description.

[0155] Referring to Figure 12, the display device 1200 according to an embodiment of the present disclosure may include a tuner 1240, a processor (e.g., including processing circuitry) 1210, a display unit (e.g., including a display) 1220, a communication unit (e.g., including communication circuitry) 1250, a sensing unit (e.g., including various sensors and / or sensing circuitry) 1230, an input / output unit (e.g., including input / output circuitry) 1270, a video processing unit (e.g., including video processing circuitry) 1280, an audio processing unit (e.g., including audio processing circuitry) 1285, an audio output unit (e.g., including audio output circuitry) 1260, a memory 1290, and a power supply unit (e.g., including a power source) 1295.

[0156] Figure 12 The communication unit 1250 corresponds to Figure 11 the communication unit 110, Figure 12 The processor 1210 corresponds to Figure 11 the processor 120, Figure 12 The memory 1290 corresponds to Figure 11 the memory 130, Figure 12 The display unit 1220 corresponds to Figure 11 the display 140, and Figure 12 The input / output unit 1270 corresponds to Figure 11 the input / output interface 150. Therefore, the descriptions provided above may not be repeated here.

[0157] The tuner 1240 according to an embodiment of the present disclosure may tune to and only select the frequency of a channel desired to be received by the display device 1200 from among a plurality of radio wave components by performing, for example, amplification, mixing, and resonance on a broadcast signal received in a wired or wireless manner. The broadcast signal includes audio, video, and additional information (e.g., EPG).

[0158] The tuner 1240 may receive broadcast signals from various sources such as terrestrial, cable, satellite, and Internet broadcasts. The tuner 1240 may also receive broadcast signals from sources such as analog broadcasters or digital broadcasters.

[0159] The sensing unit 1230 may include various sensors and / or sensing circuitry and detect a user's voice, image, or interaction, and may include a microphone 1231, a camera unit 1232, and an optical receiver 1233.

[0160] The microphone 1231 receives the voice emitted by the user. The microphone 1231 may convert the received voice into an electrical signal and output the electrical signal to the processor 1210. The user's voice may include, for example, a voice corresponding to a menu or function of the display device 1200.

[0161] The camera unit 1232 may include a camera and receive images (e.g., consecutive frames) corresponding to the user's motion (including gestures) within the recognition range of the camera. The processor 1210 may select a menu to be displayed on the display device 1200 or perform a control operation based on the result of recognizing the received motion.

[0162] The optical receiver 1233 may receive an optical signal (including a control signal) from an external control device through an optical window (not shown) of the border of the display unit 1220. The optical receiver 1233 may receive an optical signal corresponding to a user input (e.g., touch, push, touch gesture, voice, or motion) from the control device. Under the control of the processor 1210, a control signal may be extracted from the received optical signal.

[0163] The processor 1210 may include various processing circuits. For example, as used herein (including in the claims), the term "processor" may include various processing circuits including at least one processor, where one or more of the at least one processor may be configured to perform various functions described herein. Additionally, the at least one processor may include a combination of processors that perform various recited / disclosed functions. Additionally, the processor 120 controls the overall operation of the display device 1200 and the signal flow between the internal components of the display device 1200, and processes data. When a user input is received or preset and stored conditions are met, the processor 1210 may run an operating system (OS) and various applications stored in the memory 1290.

[0164] The processor 1210 may include a random access memory (RAM) for storing signals or data input from outside the display device 1200 or serving as a memory for various operations performed by the display device 1200, a read-only memory (ROM) for storing a plurality of instructions and / or control programs for controlling the display device 1200, and a processor.

[0165] The video processing unit 1280 may include various video processing circuits and process video data received by the display device 1200. The video processing unit 1280 may perform various image processing operations (such as decoding, scaling, noise removal, frame rate conversion, or resolution conversion) on the video data.

[0166] The audio processing unit 1285 may include various audio processing circuits and process audio data. The audio processing unit 1285 may perform various processing operations (such as decoding, amplification, or noise removal) on the audio data. In addition, the audio processing unit 1285 may include a plurality of audio processing modules configured to process audio corresponding to multiple pieces of content.

[0167] The audio output unit 1260 may include various audio output circuits and output, under the control of the processor 1210, the audio included in the broadcast signal received through the tuner 1240. The audio output unit 1260 may output the audio (e.g., voice or sound) input through the communication unit 1250 or the input / output unit 1270. In addition, the audio output unit 1260 may output, under the control of the processor 1210, the audio stored in the memory 1290. The audio output unit 1260 may include at least one of a speaker, a headphone output port, or a Sony / Philips Digital Interface (S / PDIF) output port.

[0168] The power supply unit 1295 may include a power supply and supply, under the control of the processor 1210, the power input from an external power source to the components inside the display device 1200. In addition, the power supply unit 1295 may supply, under the control of the processor 1210, the power output from one or more batteries (not shown) in the display device 1200 to the internal components.

[0169] The memory 1290 may store each piece of data, program, or application for driving and controlling the display device 1200 under the control of the processor 1210. The memory 1290 may include various modules, where each module may include various executable program instructions. The various modules include, for example but not limited to, a broadcast reception module, a channel control module, a volume control module, a communication control module, a voice recognition module, a motion recognition module, an optical reception module, a display control module, an audio control module, an external input control module, a power control module, a power control module for an external device connected wirelessly (e.g., Bluetooth), a voice database (DB), or a motion DB (not shown). The modules and DB (not shown) of the memory 1290 may be implemented in software to enable the display device 1200 to execute functions such as a broadcast reception control function, a channel control function, a volume control function, a communication control function, a voice recognition function, a motion recognition function, an optical reception control function, a display control function, an audio control function, an external input control function, a power control function, or a power control function for an external device connected wirelessly (e.g., Bluetooth). The processor 1210 may use the software stored in the memory 1290 to execute each function.

[0170] Figure 11 and Figure 12 The block diagrams of the display devices 100 and 1200 shown are merely examples. Each component shown in the block diagrams may be integrated, added, or omitted according to the specifications of the actually implemented display device 100 or 1200. For example, according to needs, two or more components may be integrated into one component, or one component may be divided into two or more components. In addition, the functions performed by each block are used to describe the embodiments of the present disclosure, and the detailed operations or devices do not limit the scope of the present disclosure.

[0171] A display device according to an exemplary embodiment of the present disclosure may include: a display; a communication unit including a communication circuit; a memory storing one or more instructions; and at least one processor including a processing circuit configured to run the one or more instructions.

[0172] The at least one processor may run the one or more instructions to control the communication unit to send image data received from an external device connected to the display device to another display device connected to the display device.

[0173] The at least one processor may run the one or more instructions to identify whether an operation of sending image data to another display device is being performed based on receiving a power-off signal.

[0174] The at least one processor may run the one or more instructions to turn off the display and enter a power-off standby mode based on the operation of sending image data to another display device being performed, in which the operation of sending image data to another display device is maintained.

[0175] The at least one processor may run the one or more instructions to switch to a power-saving mode based on terminating the operation of sending image data to another display device in the power-off standby mode.

[0176] A display device according to various exemplary embodiments may further include an input / output interface including a circuit connected to an external device.

[0177] An external device according to various exemplary embodiments may be connected to the display device through an HDMI port or a display port.

[0178] The at least one processor according to various exemplary embodiments may run the one or more instructions to encode image data received from an external device.

[0179] The at least one processor according to various exemplary embodiments may run the one or more instructions to control the communication unit to send the encoded image data to another display device.

[0180] The at least one processor according to various exemplary embodiments may run the one or more instructions to monitor the status of the operation of sending image data to another display device in the power-off standby mode.

[0181] The at least one processor according to various exemplary embodiments may run the one or more instructions to receive a power-off signal and enter a power-saving mode based on no operation of sending image data to another display device being performed.

[0182] At least one processor according to various example embodiments may run one or more instructions to control a memory to store information about at least one operation being performed by a display device based on entering a power saving mode.

[0183] The power saving mode according to various example embodiments may include stopping power supply to at least one processor such that operations of the at least one processor stop, and maintaining a state of power supply to the memory.

[0184] The display device according to various example embodiments may further include an input / output interface, and the input / output interface includes a circuit connected to an external device.

[0185] At least one processor according to various example embodiments may run one or more instructions to control the input / output interface to send a power-off signal to an external device in the power saving mode.

[0186] At least one processor according to various example embodiments may run one or more instructions to store information about an operation being performed by a display device and switch to a power saving mode based on termination of an operation of sending image data to another display device.

[0187] At least one processor according to various example embodiments may run one or more instructions to terminate an operation of sending image data to another display device based on a request received from the other display device to stop sending the image data.

[0188] At least one processor according to various example embodiments may run one or more instructions to terminate an operation of sending image data to another display device based on status information received from the other display device indicating that the other display device is powered off.

[0189] At least one processor according to various example embodiments may run one or more instructions to control a communication unit to disconnect from another display device based on status information received from the other display device indicating that the other display device is powered off.

[0190] A method of operating a display device according to an example embodiment of the present disclosure may include: sending image data received from an external device connected to the display device to another display device connected to the display device.

[0191] The method of operating a display device according to an example embodiment of the present disclosure may further include: receiving a power-off signal.

[0192] The method of operating a display device according to an example embodiment of the present disclosure may further include: identifying whether an operation of sending image data to another display device is being performed based on receiving the power-off signal.

[0193] The method of operating a display device according to an exemplary embodiment of the present disclosure may further include: based on an operation of transmitting image data to another display device being performed, turning off the display and entering a power-off standby mode, in which the operation of transmitting image data to another display device is maintained.

[0194] The method of operating a display device according to an exemplary embodiment of the present disclosure may further include: based on terminating the operation of transmitting image data to another display device in the power-off standby mode, switching to a power-saving mode.

[0195] The method of operating a display device according to an exemplary embodiment of the present disclosure may further include: connecting an external device to the display device through an HDMI port or a display port.

[0196] According to an exemplary embodiment, the operation of transmitting image data received from an external device connected to the display device to another display device connected to the display device may include: encoding the image data received from the external device.

[0197] According to an exemplary embodiment, the method of transmitting image data received from an external device connected to the display device to another display device connected to the display device may further include: transmitting the encoded image data to another display device.

[0198] The method of operating a display device according to an exemplary embodiment of the present disclosure may further include: in the power-off standby mode, monitoring the state of the operation of transmitting image data to another display device.

[0199] The method of operating a display device according to an exemplary embodiment of the present disclosure may further include: receiving a power-off signal and, based on no operation of transmitting image data to another display device being performed, entering the power-saving mode.

[0200] The method of operating a display device according to an exemplary embodiment of the present disclosure may further include: in the power-saving mode, sending a power-off signal to the external device.

[0201] According to an exemplary embodiment, the operation of switching to the power-saving mode may include: based on the operation of transmitting image data to another display device being terminated, storing information about the operation being performed by the display device, and switching to the power-saving mode.

[0202] The method of operating a display device according to an exemplary embodiment of the present disclosure may further include: receiving a request to stop transmitting image data from another display device.

[0203] The method of operating a display device according to an exemplary embodiment of the present disclosure may further include: based on receiving the request to stop transmitting, terminating the operation of transmitting image data to another display device.

[0204] The method of operating a display device according to an exemplary embodiment of the present disclosure may further include: receiving status information indicating that another display device is powered off from another display device.

[0205] The method of operating a display device according to an exemplary embodiment of the present disclosure may further include: based on the status information received from another display device indicating that another display device is powered off, terminating the operation of sending image data to another display device.

[0206] The method of operating a display device according to an exemplary embodiment of the present disclosure may further include: based on the status information received from another display device indicating that another display device is powered off, disconnecting the connection with another display device.

[0207] Even when a power-off signal is received while sending the image data of an external device to another display device, the display device according to an embodiment of the present disclosure may maintain the operation of sending the image data of the external device to another display device, thereby preventing / reducing the viewing of the external image by the user of another display device from being terminated.

[0208] The method of operating a display device according to an embodiment of the present disclosure may be embodied as program commands executable by various computer devices and recorded on a computer-readable medium. The computer-readable medium may include program commands, data files, data structures, etc. alone or in combination. The program commands to be recorded on the medium may be specifically designed and configured for the present disclosure, or may be known to those skilled in the art of computer software and may be used by those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media (such as hard disks, floppy disks, or magnetic tapes), optical media (such as CD-ROMs or DVDs), magneto-optical media (such as magneto-optical floppy disks), and hardware devices (such as ROMs, RAMs, or flash memories) that are specifically configured to store and run program commands. Examples of program commands include not only machine code (such as code generated by a compiler) but also high-level language code that can be run by a computer using an interpreter or the like.

[0209] In addition, the method of operating a display device according to an embodiment of the present disclosure may be included and provided in a computer program product. The computer program product may be traded as a commodity between a seller and a buyer.

[0210] A computer program product may include an S / W program and a computer-readable recording medium storing the S / W program. For example, the computer program product may include a product in the form of an S / W program (e.g., a downloadable application) electronically distributed by a manufacturer of an electronic device or an electronic marketplace (e.g., Google Play Store, App Store). For electronic distribution, at least a part of the S / W program may be stored in a storage medium or temporarily generated. In this case, the storage medium may be a storage medium of a server of the manufacturer or the electronic marketplace, or a relay server that temporarily stores the S / W program.

[0211] In a system including a server and a client device, the computer program product may include a storage medium of the server or a storage medium of the client device. Optionally, when there is a third device (e.g., a smart phone) communicatively connected to the server or the client device, the computer program product may include a storage medium of the third device. Optionally, the computer program product may include a software program that is sent from the server to the client device or the third device, or from the third device to the client device.

[0212] In this case, one of the server, the client device, and the third device may run the computer program product to execute the method according to an embodiment of the present disclosure. Optionally, two or more of the server, the client device, and the third device may run the computer program product so as to execute the method according to an embodiment of the present disclosure in a distributed manner.

[0213] For example, a server (e.g., a cloud server, an artificial intelligence server) may run the computer program product stored in the server to control the client device communicatively connected to the server to execute the method according to an embodiment of the present disclosure.

[0214] Although various example embodiments have been described in detail above, the scope of the present disclosure is not limited thereto, and various modifications and changes may be made by those skilled in the art. The following claims also fall within the scope of the present disclosure. It should also be understood that any embodiment described herein may be used in combination with any other embodiment described herein.

Claims

1. A display device (100) comprising: A display (140); A communication unit (110) comprising communication circuitry; A memory (130) storing one or more instructions; And At least one processor (120) comprising processing circuitry, configured to run the one or more instructions to perform the following operations: Control the communication unit (110) to send image data received from an external device connected to the display device to another display device connected to the display device, Based on receiving a power-off signal, identify whether the sending of the image data to the other display device is being executed, Based on the sending of the image data to the other display device being executed, turn off the display (140) and enter a power-off standby mode, in which the sending of the image data to the other display device is maintained, and Based on terminating the sending of the image data to the other display device in the power-off standby mode, switch to a power-saving mode.

2. The display device (100) according to claim 1, further comprising an input / output interface, the input / output interface comprising circuitry connectable to the external device, Among them, The external device is connected to the display device through a High-Definition Multimedia Interface (HDMI) port or a DisplayPort.

3. The display device (100) according to claim 1 or claim 2, wherein, The at least one processor (120) is configured to run the one or more instructions to encode the image data received from the external device and control the communication unit to send the encoded image data to the other display device.

4. The display device (100) according to any one of claims 1 to 3, wherein, The at least one processor (120) is configured to run the one or more instructions to monitor the status of sending the image data to the other display device in the power-off standby mode.

5. The display device (100) according to any one of claims 1 to 4, wherein, The at least one processor (120) is configured to run the one or more instructions to receive the power-off signal and enter the power-saving mode based on the sending of the image data to the other display device not being executed.

6. The display device (100) according to any one of claims 1 to 5, wherein, The at least one processor (120) is configured to run the one or more instructions to store information about at least one operation being performed by the display device in the memory (130) based on entering the power-saving mode, and Wherein, the power-saving mode includes stopping power supply to the at least one processor (120) such that the operation of the at least one processor (120) stops, and maintaining the state of power supply to the memory (130).

7. The display device (100) according to any one of claims 1 to 6, further comprising an input / output interface (150), the input / output interface (150) comprising circuitry connected to the external device, Among them, The at least one processor is configured to run the one or more instructions to control the input / output interface (150) to send a power-off signal to the external device based on entering the power-saving mode.

8. The display device (100) according to any one of claims 1 to 7, wherein, The at least one processor (120) is configured to run the one or more instructions to terminate sending the image data to the other display device based on the termination of sending the image data to the other display device, store information about the operations being performed by the display device, and switch to the power saving mode.

9. The display device (100) according to any one of claims 1 to 8, wherein, The at least one processor (120) is configured to run the one or more instructions to terminate sending the image data to the other display device based on receiving a request to stop sending the image data from the other display device.

10. The display device (100) according to claims 1 to 9, wherein, The at least one processor (120) is configured to run the one or more instructions to terminate sending the image data to the other display device based on receiving status information indicating that the other display device is powered off from the other display device, and control the communication unit (110) to disconnect from the other display device.

11. A method of operating a display device, the method comprising: Sending image data received from an external device connected to the display device to another display device connected to the display device; Receiving (S510) a power-off signal; Based on receiving the power-off signal, identifying (S520) whether sending the image data to the other display device is being performed; Based on sending the image data to the other display device being performed, turning off (S530) the display of the display device and entering (S540) a power-off standby mode, in which sending the image data to the other display device is maintained; And Based on terminating sending the image data to the other display device in the power-off standby mode, switching (S560) to a power saving mode.

12. The method according to claim 11, further comprising: Connecting the external device to the display device through a High-Definition Multimedia Interface (HDMI) port or a DisplayPort.

13. The method according to claim 11 or claim 12, wherein The method of sending the image data received from the external device connected to the display device to the other display device connected to the display device comprises: Encoding the image data received from the external device; and Sending the encoded image data to the other display device.

14. The method according to any one of claims 11 to 13, further comprising: Monitoring the status of sending the image data to the other display device in the power-off standby mode.

15. A non-transitory computer-readable recording medium having a program recorded thereon, which when run by at least one processor of an electronic device, causes the electronic device to perform operations according to the method of any one of claims 11 to 14.

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