Image control device, control method thereof, and display system

Abstract

An image control device is disclosed. The image control device comprises: a communication interface; a memory for storing instructions; and at least one processor. When the instructions are individually or collectively executed by the at least one processor, the image control device receives a door opening signal in real time from at least one display device among a plurality of display devices when the at least one display device detects door opening while an image playback device transmits image data to the plurality of display devices, identifies information about the door opening on the basis of the door opening signal, and transmits the door opening signal to the image playback device through the communication interface in order to block the transmission of the image data on the basis of the information about the door opening.

Description

Image control device and control method and display system

[0001] The present disclosure relates to an image control device, a control method thereof, and a display system, and more specifically, to an image control device, a control method thereof, and a display system for preventing the leakage of image data transmitted from an image playback device to a display device.

[0002] A display device is a device for displaying video data transmitted from or stored from an external device. Examples of display devices include monitors connected to personal computers or server computers, standard televisions (TVs), Internet Protocol televisions, smartphones, PDAs (personal digital assistants), laptop PCs, and tablet PCs. Additionally, display devices may include various display devices for displaying cinematic video, as well as large billboards installed on building rooftops or exterior walls to display advertising videos or news.

[0003] Meanwhile, for specific content such as movies and OTT videos, the creator does not want source data to be leaked without their permission during the video display process. Therefore, certain display devices are equipped with means to prevent source data from being leaked due to external intrusion while video data is being displayed.

[0004] According to the present disclosure, an image control device according to at least one embodiment may include a communication interface, a memory for storing instructions, and at least one processor. When the instructions are executed individually or collectively by the at least one processor, the image control device may receive a door opening signal in real time from at least one display device when at least one display among the plurality of display devices detects a door opening while the image playback device transmits image data to the plurality of display devices, identify information regarding the door opening based on the door opening signal, and transmit the door opening signal to the image playback device through the communication interface to block the transmission of the image data based on the information regarding the door opening.

[0005] According to the present disclosure, the image control device is connected to the plurality of display devices and acquires a first door opening signal in real time based on the voltage of a connection terminal, the voltage of which fluctuates according to the opening and closing of the doors of the plurality of display devices, and can identify the door opening based on the first door opening signal.

[0006] When the door of the plurality of display devices is closed, the image control device can receive a high voltage applied to the connection terminal in accordance with the closing of the door. When the image control device detects the opening of the door of at least one display device, it can receive a low voltage applied to the connection terminal in accordance with the opening of the door of the at least one display device, and acquire the first door opening signal in real time based on the low voltage applied to the connection terminal.

[0007] According to the present disclosure, the memory may further store identification information of the display device. When the instructions are executed individually or collectively by the at least one processor, the image control device may, when the first display device among the plurality of display devices detects a door opening, acquire identification information for the first display device along with a second door opening signal from the first display device, identify the location of the first display device based on the identification information for the first display device, and control the identified first display device to display the door opening state.

[0008] The above-described video control device may further include a cabinet, a door provided on one side of the cabinet for opening and closing the cabinet, and a door opening detection unit that detects the opening of the door and outputs a door opening signal when the opening of the door is detected.

[0009] Meanwhile, a control method for an image control device according to one or more embodiments of the present disclosure may include the steps of receiving a door opening signal from at least one display device among the plurality of display devices while the image playback device transmits image data to the plurality of display devices, identifying information regarding door opening based on the door opening signal, and transmitting the door opening signal to the image playback device to block the transmission of the image data based on the information regarding door opening.

[0010] Additionally, the step of receiving the door opening signal may include the step of acquiring a first door opening signal in real time based on the voltage of a connection terminal connected to the plurality of display devices, wherein the voltage output from the plurality of display devices varies according to the opening and closing of the doors of the plurality of display devices.

[0011] Additionally, the step of acquiring the first door opening signal may include receiving a high voltage applied to the connection terminal in accordance with the closing of the door when the door of the plurality of display devices is closed, receiving a low voltage applied to the connection terminal from the display device with the open door in accordance with the opening of the door when at least one display device detects the opening of the door, and acquiring the first door opening signal based on the received low voltage.

[0012] According to the present disclosure, the step of receiving the door opening signal may include, when the first display device among the plurality of display devices detects the door opening, the step of obtaining identification information for the first display device along with a second door opening signal from the first display device.

[0013] Additionally, the step of identifying information regarding the door opening may include the step of identifying the location of the first display device based on identification information for the first display device, and the step of controlling the identified first display device to display the door opening state.

[0014] Meanwhile, a display system according to one or more embodiments of the present disclosure may include a video playback device for transmitting video data, a plurality of display devices that receive and display video data from the video playback device and output a door opening signal by detecting the opening of a door to prevent leakage of the video data, and a video control device that identifies the opening of a door in real time based on the door opening signal output from the plurality of display devices and, when the opening of the door is identified, transmits the door opening signal to the video playback device to block the transmission of the video data.

[0015] According to the present disclosure, the display device may include a cabinet, a display panel provided on one side of the cabinet, a door provided on the other side of the cabinet for opening and closing the cabinet, a memory for storing instructions, at least one processor including a processing circuit, a door opening detection unit for detecting the opening of the door and outputting a door opening signal when the opening of the door is detected, and an interface for transmitting and receiving signals with the video playback device and the video control device.

[0016] When the above instructions are executed individually or collectively by the at least one processor, the display device can transmit a first door opening signal to the video control device in real time based on the output voltage of the door opening detection unit, which is connected to the video control device and whose voltage applied according to the opening and closing of the door varies, when the opening of the door is detected while receiving video data from the video playback device.

[0017] According to the present disclosure, the memory may further store identification information of the display device. When the instructions are executed individually or collectively by the at least one processor, if the opening of the door is detected while the display device is receiving video data from the video playback device, the identification information stored in the memory may be transmitted to the video control device along with a second door opening signal output from the door opening detection unit.

[0018] Additionally, when the display device receives a control signal from the image control device to display the door open state, it may stop the display of the image data and display a preset door state display image.

[0019] FIG. 1 is a block diagram showing the configuration of a display system according to various embodiments of the present disclosure.

[0020] FIG. 2 is a drawing for explaining a display device according to various embodiments of the present disclosure.

[0021] FIG. 3 is a block diagram showing the configuration of a display device according to various embodiments of the present disclosure.

[0022] FIGS. 4 and 5 are drawings for explaining a door opening detection unit according to various embodiments of the present disclosure.

[0023] FIG. 6 is a block diagram showing the configuration of an image playback device according to various embodiments of the present disclosure.

[0024] FIG. 7 is a block diagram showing the configuration of an image control device according to various embodiments of the present disclosure.

[0025] FIG. 8 is a drawing for explaining the operation of an image control device according to various embodiments of the present disclosure.

[0026] FIG. 9 is a flowchart illustrating a control method of an image control device according to various embodiments of the present disclosure.

[0027] The terms used in this specification will be briefly explained, and the present disclosure will be described in detail.

[0028] The terms used in the embodiments of this disclosure have been selected to be as widely used as possible, taking into account their functions within this disclosure; however, these terms may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc. Additionally, in specific cases, terms have been arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the relevant explanatory section of this disclosure. Therefore, terms used in this disclosure should be defined not merely by their names, but based on their meanings and the overall content of this disclosure.

[0029] In this specification, expressions such as “have,” “may have,” “include,” or “may include” indicate the presence of such features (e.g., numerical values, functions, operations, or components such as parts) and do not exclude the presence of additional features.

[0030] In the present disclosure, expressions such as “A or B,” “at least one of A or / and B,” or “one or more of A or / and B” may include all possible combinations of items listed together. For example, “A or B,” “at least one of A and B,” or “at least one of A or B” may refer to cases including (1) at least one A, (2) at least one B, or (3) both at least one A and at least one B.

[0031] Expressions such as "first," "second," "first," or "second" used in this specification may modify various components regardless of order and / or importance, and are used only to distinguish one component from another and do not limit said components.

[0032] Where it is stated that a component (e.g., Component 1) is "operatively or communicatively coupled with / to" or "connected to" another component (e.g., Component 2), it should be understood that the component may be directly connected to the other component or connected through the other component (e.g., Component 3).

[0033] The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "consisting of" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0034] In the present disclosure, a "module" or "part" performs at least one function or operation and may be implemented in hardware or software, or a combination of hardware and software. Additionally, a plurality of "modules" or a plurality of "parts" may be integrated into at least one module and implemented by at least one processor (not shown), except for a "module" or "part" that needs to be implemented in specific hardware.

[0035] An embodiment of the present disclosure will be described in more detail below with reference to the attached drawings.

[0036] FIG. 1 is a block diagram showing the configuration of a display system according to various embodiments of the present disclosure.

[0037] For certain content such as movies and OTT videos, creators do not want source data to be leaked without their permission during the display process. Therefore, various security measures and rules are being established to prevent the leakage of video data.

[0038] For example, a cinema display system for displaying cinematic video may perform hardware-based security processing in accordance with DCI (Digital Cinema Initiative) security rules to prevent the leakage of video data. According to DCI standards, when a display system includes video playback devices and display devices, the video playback devices and display devices may be physically or mechanically connected. Furthermore, according to DCI standards, the display system must be designed so that the main board of the display system cannot be accessed from the outside, and in the event of external access, it may be implemented so that the video playback device can immediately detect the open or closed status of the display device.

[0039] Here, DCI (Digital Cinema Initiative) refers to a consortium of film studios and standards formed in March 2002 by the seven major studios of Hollywood, USA, including Metro-Goldwyn-Mayer, Paramount Pictures, Sony Pictures, 20th Century Fox, Universal Studios Inc., The Walt Disney Company, and Warner Bros. DCI was formed to establish specifications for a common system architecture for digital cinema systems. DCI released the Digital Cinema System Specification V1.0 in July 2005, which has become the standard for digital cinema.

[0040] The primary objective of DCI is to establish and document specifications for an open architecture for digital cinema that ensures uniform and high levels of technical performance, reliability, and quality. As DCI is associated with many major Hollywood studios, its specifications can be regarded as requirements that software developers or equipment manufacturers targeting the digital cinema market must adhere to.

[0041] According to FIG. 1, a display system (10) may include a plurality of display devices (100), a video playback device (200), and a video control device (300). The video control device (300) may be connected to the plurality of display devices (100) and the video playback device (200). In this case, the plurality of display devices (100), the video playback device (200), and the video control device (300) may transmit and receive signals based on Ethernet communication. Ethernet communication can improve faster communication speeds and screen scalability compared to I2C (Inter-Integrated Circuit) communication. For example, in the case of I2C communication, the communication speed is about 100K to 400KHz, but in the case of Ethernet communication, signals can be transmitted and received at a speed of about 100Mbps.

[0042] Here, I2C (Inter-Integrated Circuit) refers to a communication standard developed by Philips for transmitting sound data between chipsets, such as DACs, and control chipsets. The I2C communication method has been utilized in fields such as hardware monitoring, sensors, and display control because it offers the advantage of enabling data transmission using only SDA lines for data transfer and SCL lines for timing synchronization, as well as connecting multiple devices.

[0043] Ethernet is a computer network technology that represents a communication standard developed to connect computers and devices in local environments, such as homes or buildings, to a network. In this context, a local environment can refer to a Local Area Network (LAN) where multiple devices are connected to create, store, and share information with others in the same location. By utilizing Ethernet, it is possible to implement a network structure where multiple systems can be connected and communicate over a single internet line.

[0044] In addition, since I2C communication is a method consisting of one master and multiple slaves, in order for a video playback device to identify the door open status of multiple display devices using I2C communication, communication must be performed in proportion to the number of display devices. If the number of display devices is composed of 96, the video playback device must perform 96 communications with the multiple display devices in the I2C communication method.

[0045] However, in the case of Ethernet communication, since communication is performed in a Master-Master manner, when a door opening is detected by multiple display devices, a door opening signal can be output in real time.

[0046] In terms of screen scalability, display systems using I2C communication are limited in screen scalability because they can only connect up to 128 slaves, whereas Ethernet communication allows the number of screens to be expanded according to the resolution required by the operator through a Master-Master method.

[0047] In addition, regarding the transmission distance of the signal, using the I2C communication method allows the signal to be transmitted up to about 30m, whereas using the Ethernet communication method allows the signal to be transmitted up to about 100m, making it easier to expand and install the display.

[0048] A plurality of display devices (100) are configured to receive and display video data transmitted from a video playback device (200). In this case, the plurality of display devices (100) are devices for displaying video data, and the plurality of display devices (100) may form a single screen to display video data, or each display device may form a separate screen. If the plurality of display devices (100) form a single screen, the plurality of display devices (100) may be arranged in a matrix form. For example, if there are 96 plurality of display devices (100), the plurality of display devices (100) may be arranged in a matrix form of 16 rows and 6 columns.

[0049] Multiple display devices (100) may be used as large screens in a movie theater or as large screens installed on the rooftop or exterior wall of a building. However, they are not limited thereto, and any device may be used as a device that displays video data and is equipped with security means to prevent the leakage of video data. This is merely an example and is not limited thereto, and multiple display devices (100) may be implemented as various types of electronic devices.

[0050] A plurality of display devices (100) can detect the opening of a door and output a door opening signal to prevent the leakage of video data. For example, a plurality of display devices (100) can detect the opening of a door in real time and transmit a first door opening signal to a video playback device (200) or a video control device (300). Alternatively, when a signal requesting door opening / closing history is received from the video playback device (200), the plurality of display devices (100) may transmit door opening / closing history information stored in memory to the video playback device (200). In this case, the plurality of display devices (100) may store door opening / closing history, including door opening / closing status information and storage time, in memory.

[0051] A plurality of display devices (100) can detect the opening of a door, and when the opening of a door is detected, they can transmit a second door opening signal to a video control device (300) along with identification information of the display device stored in memory. In this case, if a door opening signal is detected in at least one of the plurality of display devices (100), the display device in which the door opening was detected can transmit a door opening signal to the video control device (300).

[0052] In a plurality of display devices (100), the first display device (101) and the remaining other display devices (102, ..., 10n) can be implemented with the same configuration. Hereinafter, the plurality of display devices (100) will be described based on the first display device (101).

[0053] The video playback device (200) is configured to transmit video data to a plurality of display devices (100). The video playback device (200) identifies the door opening / closing status of the plurality of display devices (100), and if the door of at least one of the plurality of display devices (100) is identified as being in an open state, it can stop the video data transmitted to the plurality of display devices (100). For example, the video playback device (200) can transmit a signal to request a door opening / closing history from the plurality of display devices (100) and receive a signal regarding the door opening / closing history from the plurality of display devices (100). Additionally, the video playback device (200) can identify the door opening status of the plurality of display devices (100) based on the received door opening / closing history.

[0054] The image control device (300) can acquire a door opening signal output from a display device when a door is opened in at least one of the multiple display devices (100). The image control device (300) can identify the opening of the door in real time based on the door opening signal output from the multiple display devices (100). When the opening of the door for at least one display device is identified, the image control device (300) can transmit the door opening signal to the image playback device (200) to block the transmission of image data provided from the image playback device (200) to the multiple display devices (100). In this case, when the image playback device (200) receives the door opening signal from the image control device (300), it can stop the image data being transmitted to the multiple display devices (100).

[0055] When the image control device (300) receives a door opening signal along with identification information from a display device with an open door among a plurality of display devices (100), it can identify the door opening / closing status of the plurality of display devices (100) and the location of the display device with an open door. Additionally, the image control device (300) can control the display device with an open door to display the door opening status on the display device. For example, when the image control device (300) receives a door opening signal from a first display device (101) among a plurality of display devices (100), it can control the WEB UI of the first display device (101) where the door opening signal was detected to display the door opening status.

[0056] FIG. 2 is a drawing for explaining a display device according to various embodiments of the present disclosure, and FIG. 3 is a block diagram showing the configuration of a display device according to various embodiments of the present disclosure.

[0057] According to FIGS. 2 and 3, the display device (101) may include a cabinet (110), a door (120), an interface (130), a display (140), a memory (150), a door opening detection unit (160), and a processor (170).

[0058] The cabinet (110) can accommodate components included in the display device (101). Various components and circuits for implementing the functions of the display device (101) are accommodated inside the cabinet (110), and a display panel for displaying images may be provided on one side of the cabinet (110). For example, if the functions of the display device (101) are implemented as a Printed Board Assembly (PBA), a PBA for implementing functions such as an interface (130), memory (150), door opening detection unit (160), and processor (170) may be installed inside the cabinet (110).

[0059] The door (120) is a component for protecting the components housed inside the cabinet (110). For example, the door (120) may be installed on the other side of the cabinet (110) to open or close the interior of the cabinet (110).

[0060] The interface (130) is configured to receive various data from a user, external memory, or external device. The interface (130) can transmit and receive signals with the video playback device (200) and the video control device (300). For example, the interface (130) can receive user commands or receive video data from the video playback device (200).

[0061] The interface (130) may include a communication interface (131), an operation interface (132), and an input / output interface (133), etc. The communication interface (131) is configured to perform communication with at least one external device. The communication interface (131) may include at least one wireless communication module, at least one wired communication module, etc. Each communication module may be implemented in the form of at least one hardware chip. The wireless communication module may include at least one module among a Wi-Fi module, a Bluetooth module, an infrared communication module, or other communication modules. In addition, the communication interface (131) may include at least one communication chip that performs communication according to various wireless communication standards such as Zigbee, 3G (3rd Generation), 3GPP (3rd Generation Partnership Project), LTE (Long Term Evolution), LTE-A (LTE Advanced), 4G (4th Generation), 5G (5th Generation), etc. The wired communication module may include, for example, at least one of a LAN (Local Area Network) module, an Ethernet module, a pair cable, a coaxial cable, a fiber optic cable, or an UWB (Ultra Wide-Band) module. The communication interface (131) is implemented in various forms such as this, and by communicating with an external device, it can receive video data or control signals from the external device.

[0062] The operation interface (132) is configured to receive user operation input. The operation interface (132) may include various buttons, touch screens, etc. provided on the main body of the display device (101). The user can control the operation of the display device (101) or control the communication interface (131) or the input / output interface (133) to receive video data into the display device (101) using the operation interface (132).

[0063] The input / output interface (133) is configured to input and output various external signals. The input / output interface (133) can be connected to various external memory or external sources (e.g., video playback device, video control device, web server, user terminal device, etc.) to receive various data. The input / output interface (133) can be implemented as at least one interface among HDMI (High Definition Multimedia Interface), MHL (Mobile High-Definition Link), USB (Universal Serial Bus), USB C-type, DP (Display Port), Thunderbolt, VGA (Video Graphics Array) port, RGB port, D-SUB (D-subminiature), and DVI (Digital Visual Interface). The display device (101) can directly read or receive video data stored in an external memory or external source connected through the input / output interface (133).

[0064] The display (140) can perform display operations under the control of the processor (170). For example, the processor (170) can control the display (140) to display image data. The display (140) may include a display panel provided on one side of the cabinet. The display (140) may be implemented as a display including a self-emissive element or as a display including a non-emissive element and a backlight. For example, it may be implemented as various types of displays such as an LCD (Liquid Crystal Display), an OLED (Organic Light Emitting Diodes) display, an LED (Light Emitting Diodes), a micro LED, a Mini LED, a PDP (Plasma Display Panel), a QD (Quantum dot) display, a QLED (Quantum dot light-emitting diodes), etc.

[0065] The memory (150) can store at least one instruction, data, program, etc. required for the operation of the display device (101) or the processor (170). The memory (150) can store identification information for identifying the display device (101) among the plurality of display devices (100). Each memory provided in the plurality of display devices (100) can store identification information that is distinct from one another. Additionally, when the processor (170) detects a door opening signal, it can store a door opening / closing history, including the opening / closing status information of the door (120) and the storage time, in the memory (150).

[0066] The memory (150) may be implemented in the form of a memory embedded in the display device (101) or in the form of a memory detachable from the display device (101), depending on the purpose of data storage. For example, data for driving the display device (101) may be stored in a memory embedded in the display device (101), and data for the expansion function of the display device (101) may be stored in a memory detachable from the display device (101).

[0067] In the case of memory embedded in the display device (101), it may be implemented as at least one of volatile memory (e.g., DRAM (dynamic RAM), SRAM (static RAM), or SDRAM (synchronous dynamic RAM), non-volatile memory (e.g., OTPROM (one time programmable ROM), PROM (programmable ROM), EPROM (erasable and programmable ROM), EEPROM (electrically erasable and programmable ROM), mask ROM, flash ROM, flash memory (e.g., NAND flash or NOR flash), hard drive, or solid state drive (SSD).

[0068] The memory (150) may be implemented as a single memory that stores data generated in various operations according to the present disclosure. However, it is not limited thereto, and the memory (150) may be implemented to include a plurality of memories that each store different types of data or each store data generated in different stages.

[0069] The door opening detection unit (160) is configured to detect the opening of the door (120) and to output a door opening signal when the opening of the door is detected. The door opening detection unit (160) may include various door opening detection means. The door opening detection unit (160) may include at least one of a detection sensor such as an infrared sensor, an ultrasonic sensor, or a distance sensor capable of detecting whether the door (120) is open or closed, a pressure sensor capable of identifying whether the door (120) is open or closed using pressure, a contact sensor capable of identifying whether the door (120) is open or closed by detecting the contact state of the door (120) with respect to the contact surface of the cabinet (110), or a door switch implemented such that the on / off state of the switch changes according to the opening or closing of the door (120).

[0070] For example, when the door opening detection unit (160) detects the opening of the door (120) while receiving video data from the video playback device (200), it may output a first door opening signal in real time to the video playback device (200) or the video control device (300). In this case, the door opening detection unit (160) is connected to the video playback device (200) or the video control device (300), and may transmit the first door opening signal in real time to the video playback device (200) or the video control device (300) based on an output voltage that fluctuates according to the opening and closing of the door (120). The configuration and operation of the door opening detection unit (160) will be explained in detail again with reference to FIGS. 4 and FIGS. 5 in the following section.

[0071] The processor (170) is a component connected to each component of the display device (101) to control the overall operation of the display device (101). The processor (170) may be implemented as a digital signal processor (DSP), a microprocessor, a Graphics Processing Unit (GPU), an Artificial Intelligence (AI) processor, a Neural Processing Unit (NPU), etc. However, it is not limited thereto, and may include or be defined by one or more of a central processing unit (CPU), a Micro Controller Unit (MCU), a micro processing unit (MPU), a controller, an application processor (AP), a communication processor (CP), or an ARM processor. Additionally, the processor (170) may be implemented as a System on Chip (SoC) or Large Scale Integration (LSI) with built-in processing algorithms, or may be implemented in the form of an Application Specific Integrated Circuit (ASIC) or Field Programmable Gate Array (FPGA).

[0072] When the processor (170) is implemented as a dedicated processor, it may be implemented to include memory for implementing an embodiment of the present disclosure, or may be implemented to include a memory processing function for using external memory. The processor (170) may be implemented as one or a plurality of processors.

[0073] When the processor (170) detects the opening of the door (120) while receiving video data from the video playback device (200), it can transmit identification information stored in the memory (150) to the video control device (300) along with a second door opening signal output from the door opening detection unit (160). When the processor (170) receives a control signal for displaying the door opening status from the video control device (300), it can stop the display of the video data transmitted from the video playback device (200) and display a preset door status display image.

[0074] FIGS. 4 and 5 are drawings for explaining a door opening detection unit according to various embodiments of the present disclosure. Specifically, FIGS. 4 and 5 are drawings for explaining a door opening detection unit implemented as a door switch. FIG. 4 shows a door switch when the door is closed, and FIG. 5 shows a door switch when the door is open.

[0075] According to FIGS. 4 and 5, the door switch (400) may include a first terminal (410), a second terminal (420), a third terminal (430), a fourth terminal (440), a conductive member (450), a supporting member (460), and an elastic member (470). The first terminal (410) and the second terminal (420) are configured to be separated from each other and may be short-circuited or open depending on the open / closed state of the door (120) to supply a preset high voltage or low voltage to a video playback device (200) or a video control device (300).

[0076] For example, the video playback device (200) or the video control device (300) may apply a preset high voltage (VCC) to the TAMPER_O terminal and apply a ground voltage (GND) or 0V voltage to the TAMPER_I terminal. In this case, the TAMPER_O terminal may be an output terminal of the video playback device (200). The TAMPER_O terminal may be connected to the first terminal (410) via the first transmission line (480). Additionally, the TAMPER_I terminal may be an input terminal of the video playback device (200). The TAMPER_I terminal may be connected to the second terminal (420) via the second transmission line (490).

[0077] Referring to FIG. 4, when the door (120) is closed, the first terminal (410) and the second terminal (420) can be separated from each other as the door (120) pushes the conductive member (450) connected to the support member (460) inward. In this case, a high voltage (VCC) applied through the TAMPER_O terminal is output to the video playback device (200) or video control device (300), and the video playback device (200) or video control device (300) can identify the closure of the door based on the output high voltage.

[0078] The third terminal (430) and the fourth terminal (440) are configured to be separated from each other and can be short-circuited or open depending on the open / closed state of the door (120) to supply a preset high voltage or low voltage to the processor (170). For example, a preset high voltage (VCC) may be applied to the third terminal (430), and the fourth terminal (440) may be connected to a ground voltage (GND) or 0V voltage. Additionally, the fourth terminal (440) may be connected to the processor (170), and a resistor (R) may be configured between the fourth terminal (440) and the ground voltage (GND).

[0079] When the door (120) is closed, the door (120) can electrically short-circuit the third terminal (430) and the fourth terminal (440) through the conductive member (450) by pushing the conductive member (450) connected to the support member (460) inward. In this case, when a first high voltage (VCC) is applied to the third terminal (430), a second high voltage (High Voltage) is output to the processor (170) instead of the ground voltage (GND) due to the first high voltage (VCC) applied to the fourth terminal (440) through the third terminal (430), and the processor (170) can identify the closure of the door based on the second high voltage (High Voltage). For example, if a resistor (R) is provided between the fourth terminal (440) and the ground voltage (GND), a second high voltage corresponding to VCC*R / (1+R) is output to the processor (170), and the processor (170) can identify the closure of the door based on the voltage value changed from the ground voltage (GND) to the second high voltage.

[0080] Referring to FIG. 5, when the door (120) is opened, the conductive member (450) can be pushed outward through an elastic member (470) installed between the cabinet (110) and the conductive member (450), thereby electrically short-circuiting the first terminal (410) and the second terminal (420). In this case, the high voltage (VCC) applied to the first terminal (410) through the first transmission line (480) from the image control device (300) can be output through the ground voltage (GND) connected to the second terminal (420). A low voltage is applied to the TAMPER_O terminal as the TAMPER_O terminal and the TAMPER_I terminal are electrically connected, and the low voltage can be output to the image playback device (200) or the image control device (300).

[0081] Accordingly, the video playback device (200) or the video control device (300) can obtain a first door opening signal based on a low voltage applied through the second transmission line (490).

[0082] When the door (120) is opened, the conductive member (450) is pushed outward, and the third terminal (430) and the fourth terminal (440) can be separated from each other. In this case, the fourth terminal (440) can output a ground voltage (GND) because the supply of the high voltage (VCC) applied from the third terminal (430) is cut off (Off). The ground voltage (GND) is output to the processor (170) through the fourth terminal (440), and the processor (170) can obtain a second door opening signal based on the output ground voltage (GND).

[0083] The conductive member (450) is composed of a conductive material that conducts electricity and is configured to selectively connect the first terminal (410) and the second terminal (420), or the third terminal (430) and the fourth terminal (440), depending on the open / closed state of the door (120). For example, the conductive member (450) may be implemented to electrically connect the third terminal (430) and the fourth terminal (440) when the door (120) is closed, and to electrically connect the first terminal (410) and the second terminal (420) when the door (120) is open.

[0084] The support member (460) is configured such that when the door (120) is closed, one side of the support member (460) contacts the door (120) and transmits pressure from the door (120) to the conductive member (450). When the door (120) is closed, the support member (460) is pushed by the door (120), thereby moving the conductive member (450) mounted on the opposite side of the support member (460) toward the inside of the cabinet (110). In this case, the conductive member (450) is connected to the third terminal (430) and the fourth terminal (440) installed inside the cabinet (110), and the third terminal (430) and the fourth terminal (440) can be electrically short-circuited.

[0085] The elastic member (470) can provide a restoring force to move the conductive member (450) outwardly toward the cabinet (110) when the door (120) is opened. For example, the elastic member (470) is provided between the cabinet (110) and the conductive member (450), and when the door (120) is opened, the conductive member (450) can be moved outwardly toward the cabinet (110) so that the conductive member (450) electrically connects the first terminal (410) and the second terminal (420).

[0086] Accordingly, the door opening detection unit according to the present disclosure may output a first door opening signal based on a low voltage or ground voltage (GND) supplied to a video playback device (200) or a video control device (300) when the door (120) is opened, and may output a second door opening signal based on a low voltage or ground voltage supplied to a processor (170).

[0087] FIG. 6 is a block diagram showing the configuration of an image playback device according to various embodiments of the present disclosure.

[0088] According to FIG. 6, the video playback device (200) may include an interface (210), a display (220), a memory (230), and a processor (240). A detailed description of the configurations shown in FIG. 6 that overlap with the configuration shown in FIG. 3 will be omitted.

[0089] The interface (210) is configured to receive various data from a user, external memory, or external device, or to transmit data to an external device. For example, the interface (210) can receive user input from a user or receive video data from an external device. Additionally, the interface (210) can transmit the received video data to a plurality of display devices (100).

[0090] The interface (210) may include a communication interface (211), an operation interface (212), and an input / output interface (213), etc. The communication interface (211) is configured to perform communication with at least one external device. The operation interface (212) is configured to receive user operation input. The operation interface (212) may include various buttons, a touch screen, etc. provided on the main body of the video playback device (200).

[0091] The input / output interface (213) is configured to input and output various external signals. The input / output interface (213) can be connected to various external memory or external sources (e.g., display device, video control device, web server, user terminal device, etc.) to input and output various data.

[0092] The display (220) is configured to display operation information corresponding to user input or to display operation information of the display system (10).

[0093] The memory (230) can store at least one instruction, data, program, etc. required for the operation of the video playback device (200). When video data is input from an external device, the processor (240) can store the video data in the memory (230). Additionally, when door opening / closing history information is input from a plurality of display devices (100), the processor (240) can store the input door opening / closing history information in the memory (230).

[0094] The processor (240) is configured to be connected to each component of the video playback device (200) and to control the overall operation of the video playback device (200). For example, the processor (240) may periodically request door opening / closing history from a plurality of display devices (100) and receive door opening / closing history information from the plurality of display devices (100). Additionally, the processor (240) may identify whether the door (120) is open based on the door opening / closing history information, and if the opening of the door (120) is confirmed, stop the video data transmitted to the plurality of display devices (100).

[0095] FIG. 7 is a block diagram showing the configuration of an image control device according to various embodiments of the present disclosure.

[0096] According to FIG. 7, the video control device (300) may include a cabinet (310), a door (320), an interface (330), a memory (340), a door opening detection unit (350), and a processor (360). According to the Digital Cinema Initiative (DCI) security rules, electronic devices connected to the video playback device (200) must undergo hardware-based security processing to prevent the leakage of video data. Among the components of the video control device (300), the cabinet (310), the door (320), and the door opening detection unit (350) are components for such security processing. Detailed descriptions of components shown in FIG. 7 that overlap with the components shown in FIG. 3 will be omitted.

[0097] The cabinet (310) can accommodate components included in the image control device (300). Various components and circuits for implementing the functions of the image control device (300) can be accommodated inside the cabinet (310). For example, various components and circuits for implementing functions such as an interface (330), memory (340), door opening detection unit (350), and processor (360) can be installed inside the cabinet (310).

[0098] The door (320) is a component for protecting the components housed inside the cabinet (310). For example, the door (320) may be installed on one side of the cabinet (310) to open or close the interior of the cabinet (310).

[0099] The interface (330) is configured to receive various data from a user, external memory, or external device, or to transmit data to an external device. For example, the interface (330) can receive a door opening signal from a plurality of display devices (100) or transmit the received door opening signal to a video playback device (200). The interface (330) may include a communication interface (331), an operation interface (332), and an input / output interface (333), etc.

[0100] The memory (340) can store at least one instruction, data, program, etc. required for the operation of the image control device (300). When the processor (350) receives door opening / closing history information from a plurality of display devices (100), it can store the door opening / closing history in the memory (340). Additionally, the memory (340) can store identification information for each of the plurality of display devices (100).

[0101] The door opening detection unit (350) is configured to detect the opening of the door (320) and to output a door opening signal when the opening of the door (320) is detected. Similar to the plurality of display devices (100), the video control device (300) must also comply with security regulations to prevent the leakage of video data. Accordingly, when the video control device (300) receives a signal requesting a door opening / closing history from the video playback device (200), it can detect the door opening and transmit a door opening / closing history signal to the video playback device (200).

[0102] The door opening detection unit (350) may include various door opening detection means. For example, the door opening detection unit (350) may include at least one of a detection sensor such as an infrared sensor, an ultrasonic sensor, or a distance sensor capable of detecting whether the door (320) is open or closed, a pressure sensor capable of identifying whether the door (320) is open or closed using pressure, a contact sensor capable of identifying whether the door (320) is open or closed by detecting the contact state of the door (320) with respect to the contact surface of the cabinet (310), or a door switch implemented such that the on / off state of the switch changes according to the opening or closing of the door (320).

[0103] The processor (360) is configured to be connected to each component of the image control device (300) and to control the overall operation of the image control device (300). For example, while the image playback device (200) is transmitting image data to a plurality of display devices (100), if at least one of the plurality of display devices (100) detects a door opening, the processor (360) can receive a door opening signal in real time from at least one display device.

[0104] The processor (360) can identify information regarding door opening based on a door opening signal received from at least one display device. For example, the processor (360) can identify information regarding the door opening / closing status of a plurality of display devices (100) and location information of the display device where the door is open. Based on the information regarding door opening, the processor (360) can transmit the door opening signal to the video playback device (200) through the communication interface (331) to block the transmission of video data provided from the video playback device (200) to the plurality of display devices (100).

[0105] In this case, the processor (360) can obtain a first door opening signal in real time through a connection terminal connected to a plurality of display devices (100). For example, the connection terminal may be implemented to form a closed loop with door opening detection units provided in the plurality of display devices (100). The connection terminal may be implemented so that the voltage fluctuates according to the opening and closing of the doors of the plurality of display devices (100). For example, when the doors of the plurality of display devices (100) are closed, the processor (360) can receive a high voltage applied to the connection terminal according to the closing of the doors.

[0106] Additionally, when the processor (360) detects that at least one of the plurality of display devices (100) has a door opened, it can receive a ground voltage (Low Voltage) applied to a connection terminal according to the opening of the door of at least one of the display devices. The processor (360) can acquire a first door opening signal in real time based on the ground voltage applied to the connection terminal, and can identify the opening of the door for at least one of the plurality of display devices (100) based on the first door opening signal.

[0107] When the processor (360) detects that the first display device (101) among the plurality of display devices (100) has a door open, it can obtain identification information for the first display device (101) along with a second door open signal from the first display device (101). When the processor (360) receives the second door open signal and the identification information for the first display device (101), it can identify the location of the first display device (101) among the plurality of display devices (100) whose door has been opened based on the identification information stored in the memory (340), and control the identified first display device (101) to display the door open state.

[0108] For example, when the processor (360) receives a second door opening signal and identification information from the first display device (101), it may stop the display of image data for the first display device (101) and control the WEB UI of the first display device (101) to display a preset door status display image.

[0109] FIG. 8 is a drawing for explaining the operation of an image control device according to various embodiments of the present disclosure.

[0110] When a signal requesting door opening / closing history is received from a video playback device (200), a plurality of display devices (100) or video control devices (300) can transmit door opening / closing history information stored in memory (150, 340) to the video playback device (200). A plurality of display devices (100) can detect the opening of a door using a door opening detection unit (160), and when the opening of a door is detected, they can transmit a door opening signal to the video control device (300) in real time.

[0111] According to FIG. 8, the video playback device (200) can be electrically connected to the door opening detection unit (350) of the video control device (300) and the door opening detection unit (160) of the plurality of display devices (100). For example, the TAMPER_O terminal of the video playback device (200) can be electrically connected to the first terminal of the video control device (300) and each first terminal (410) of the plurality of display devices (100) through a first transmission line (810). Additionally, the TAMPER_I terminal of the video playback device (200) can be electrically connected to the second terminal of the video control device (300) and each second terminal (420) of the plurality of display devices (100) through a second transmission line (820).

[0112] Referring to FIG. 8, a high voltage (VCC) can be applied to the first transmission line (810) through the TAMPER_O terminal, and a ground voltage can be applied to the second transmission line (820) through the TAMPER_I terminal. When the doors of the image control device (300) and the plurality of display devices (100) are closed, the first terminal and the second terminal become open, so a high voltage (VCC) can be output to the first transmission line (810).

[0113] However, when the door is opened in at least one of the video control device (300) or the plurality of display devices (100), the first transmission line (810) connected from the TAMPER_O terminal of the video playback device (200) to the first terminal of the video control device (300) and the first terminal of the plurality of display devices (100), and the second transmission line (820) connected from the TAMPER_I terminal to the second terminal of the video control device (300) and the second terminal of the plurality of display devices (100) may be short-circuited. In this case, since the high voltage (VCC) applied to the first transmission line (810) is output through the ground voltage of the second transmission line (820), the output voltage applied to the TAMPER_O terminal of the video playback device (200) may fluctuate to a low voltage (e.g., GND).

[0114] Accordingly, the video playback device (200) can identify the opening of the door in real time without requesting door opening / closing history information when the door is opened in the video control device (300) or the plurality of display devices (100).

[0115] Likewise, the processor (360) of the image control device (300) can identify the opening of the door to the plurality of display devices (100) in real time based on the output voltage of the first transmission line (810) when the door is opened in at least one of the plurality of display devices (100).

[0116] Additionally, when a door is opened in at least one of the plurality of display devices (100), the processor (360) of the image control device (300) may receive a door opening signal along with identification information from the display device (101) with the open door through a path (MDC) different from the first transmission line (810). When a door is opened in at least one of the plurality of display devices (100), the image control device (300) may identify the location of the display device with the open door based on the identification information and control the identified display device to display the door opening information.

[0117] The processor (360) may also transmit door opening information of a display device with an open door to an external device (500). In this case, the external device (500) may be implemented as various types of devices such as a smartphone, PDA (personal digital assistant), computer, laptop PC, tablet PC, etc. When a door is opened in at least one of the multiple display devices (100), the processor (360) may transmit door opening information including location information of the identified display device through the WEB UI of the external device (500).

[0118] As such, the image control device (300) according to the present disclosure can quickly identify the door opening status because it receives a door opening signal in real time from the display device with the open door when at least one door among the plurality of display devices (100) is opened. In addition, since the image control device (300) according to the present disclosure receives a door opening signal from the display device with the open door, it can reduce communication resources and reduce the time required to check the door opening status. Furthermore, since the image control device (300) according to the present disclosure identifies the door opening for the plurality of display devices through a dual path of a first door opening signal and a second door opening signal, it can accurately identify whether the door is open or closed.

[0119] FIG. 9 is a flowchart illustrating a control method for an image control device according to various embodiments of the present disclosure. The image control device may be connected to a plurality of display devices and an image playback device. The image playback device may transmit image data to a plurality of display devices. A plurality of display devices may receive image data from the image playback device and display an image.

[0120] According to FIG. 9, the image control device can receive a door opening signal from at least one of the multiple display devices while the image playback device transmits image data to the multiple display devices (S910). In this case, the image control device can obtain a first door opening signal that is output in real time from the multiple display devices and a second door opening signal transmitted from the display device among the multiple display devices that has a door opened.

[0121] For example, the video control device can acquire a first door opening signal in real time based on the voltage of a connection terminal connected to a plurality of display devices. The connection terminal connected to the plurality of display devices via a transmission line can be configured so that the voltage output from the plurality of display devices varies according to the opening and closing of the doors of the plurality of display devices.

[0122] Specifically, when the doors of a plurality of display devices are closed, the image control device can receive a high voltage applied to a connection terminal in accordance with the closing of the doors. Additionally, when at least one of the plurality of display devices detects the opening of a door, the image control device can receive a low voltage applied to a connection terminal from the display device with the open door in accordance with the opening of the door. Additionally, the image control device can obtain a first door opening signal based on the low voltage received through the connection terminal.

[0123] Additionally, when at least one of the plurality of display devices detects a door opening, the image control device may receive identification information for each display device along with a second door opening signal from the display device that detected the door opening. For example, when a door is opened at a first display device among the plurality of display devices, the image control device may obtain identification information for the first display device along with a second door opening signal from the first display device.

[0124] When the image control device receives a door opening signal, it can identify information regarding the door opening based on the received door opening signal (S920). For example, when the image control device receives identification information for the first display device along with a second door opening signal from the first display device, it can identify the location of the first display device based on the identification information for the first display device. In this case, identification information for a plurality of display devices may be stored in advance in the image control device. When the image control device receives identification information from a display device with an open door, it can identify the location of the display device with an open door by comparing the previously stored identification information with the received identification information.

[0125] Additionally, when the location of the first display device with the door open is identified, the video control device can control the identified first display device to display the door open status. For example, the video control device can control the WEB UI of the identified first display device to display a preset door open indicator image.

[0126] In this case, the video control device may transmit door opening information of the display device with the open door to an external device. The external device may be implemented as various types of devices, such as smartphones, PDAs (personal digital assistants), computers, laptop PCs, and tablet PCs. When the door is opened at least one of the multiple display devices, the video control device may transmit door opening information, including location information of the identified display device, through the WEB UI of the external device.

[0127] The video control device may transmit a door opening signal to the video playback device to block the transmission of video data based on information regarding door opening (S930). When video data is transmitted from the video playback device to a plurality of display devices via the video control device, if a door opening signal is received from the plurality of display devices, the video control device may block the video data transmitted to the plurality of display devices.

[0128] However, when video data is transmitted from a video playback device to multiple display devices, the video control device cannot block the transmission of video data even if it receives door opening signals from multiple display devices. In this case, the video control device may transmit the door opening signals received from multiple display devices to the video playback device to prevent leakage of video data.

[0129] The video playback device can stop video data transmitted to multiple display devices based on a door opening signal received from the video control device. Additionally, the video playback device may transmit a signal requesting door opening / closing history information to multiple display devices and receive door opening / closing history information from multiple display devices. Based on the received door opening / closing history information, the video playback device identifies the door opening status and can stop the transmission of video data when the door opening is identified.

[0130] Meanwhile, according to the embodiments of the present disclosure, the various embodiments described above may be implemented as software containing instructions stored on a machine-readable storage medium (e.g., a computer). The machine may include a video playback device, a video control device, and a display device according to the disclosed embodiments, as a device capable of calling instructions stored from the storage medium and operating according to the called instructions. When instructions are executed by a processor, the processor may perform a function corresponding to the instructions directly or by using other components under the control of the processor. Instructions may include code generated or executed by a compiler or an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, "non-transitory" means only that the storage medium does not contain a signal and is tangible, and does not distinguish whether data is stored semi-permanently or temporarily in the storage medium.

[0131] Additionally, according to one embodiment of the present disclosure, the method according to the various embodiments described above may be provided as included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)) or online through an application store (e.g., Play Store™). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily created in a storage medium such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0132] Additionally, each component (e.g., module or program) according to the various embodiments described above may be composed of a single or multiple entities, and some of the aforementioned sub-components may be omitted, or other sub-components may be further included in the various embodiments. Generally or additionally, some components (e.g., module or program) may be integrated into a single entity to perform the functions performed by each of the respective components prior to integration in the same or similar manner. The operations performed by the module, program, or other components according to the various embodiments may be executed sequentially, in parallel, iteratively, or heuristically, or at least some operations may be executed in a different order, omitted, or other operations added.

[0133] Although preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above. It is understood that various modifications can be made by those skilled in the art without departing from the essence of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present disclosure.

Claims

1. A video control device connected to a plurality of display devices and a video playback device for controlling the plurality of display devices, Communication interface; Memory for storing instructions; and It includes at least one processor; and When the above instructions are executed individually or collectively by the at least one processor, the image control device, While the video playback device transmits video data to the plurality of display devices, if at least one display among the plurality of display devices detects a door opening, a door opening signal is received in real time from the at least one display device, and Based on the above door opening signal, information regarding door opening is identified, and A video control device that transmits the door opening signal to the video playback device through the communication interface in order to block the transmission of the video data based on information regarding the door opening.

2. In Paragraph 1, When the above instructions are executed individually or collectively by the at least one processor, the image control device, A first door opening signal is obtained in real time based on the voltage of a connection terminal that is connected to the plurality of display devices and whose voltage fluctuates according to the opening and closing of the doors of the plurality of display devices, and A video control device that identifies the door opening based on the first door opening signal.

3. In Paragraph 2, When the above instructions are executed individually or collectively by the at least one processor, the image control device, When the doors of the plurality of display devices are closed, a high voltage applied to the connection terminal is received in accordance with the closing of the doors, and When the above at least one display device detects door opening, it receives a ground voltage (Low Voltage) applied to the connection terminal according to the opening of the door of the above at least one display device, and An image control device that acquires the first door opening signal in real time based on the ground voltage applied to the above connection terminal.

4. In Paragraph 1, The above memory further stores identification information of the display device, and When the above instructions are executed individually or collectively by the at least one processor, the image control device, When the first display device among the plurality of display devices detects door opening, identification information for the first display device is obtained along with a second door opening signal from the first display device, and Identify the location of the first display device based on identification information for the first display device, and A video control device that controls an identified first display device to display the door open state.

5. In Paragraph 1, When the above instructions are executed individually or collectively by the at least one processor, the image control device, Cabinet; A door provided on one side of the cabinet for opening and closing the cabinet; and A warrant control device further comprising: a door opening detection unit that detects the opening of the door and outputs a door opening signal when the opening of the door is detected.

6. A method for controlling an image control device for controlling a plurality of display devices connected to a plurality of display devices and an image playback device, wherein A step of receiving a door opening signal from at least one of the plurality of display devices while the above video playback device transmits video data to the plurality of display devices; A step of identifying information regarding door opening based on the above door opening signal; and A control method comprising the step of transmitting the door opening signal to the video playback device to block the transmission of the video data based on information regarding the door opening.

7. In Paragraph 6, The step of receiving the above door opening signal is, A control method comprising: a step of obtaining a first door opening signal in real time based on the voltage of a connection terminal connected to the plurality of display devices, wherein the voltage output from the plurality of display devices varies according to the door opening and door closing of the plurality of display devices.

8. In the 7th, The step of obtaining the first door opening signal is, When the doors of the plurality of display devices are closed, a step of receiving a high voltage applied to the connection terminal in accordance with the closing of the doors; When the at least one display device detects door opening, the method comprises the step of receiving a ground voltage (Low Voltage) applied to the connection terminal from the display device with the open door in accordance with the opening of the door; and A control method comprising the step of obtaining the first door opening signal based on the received ground voltage.

9. In Paragraph 6, The step of receiving the above door opening signal is, A control method comprising the step of, when a first display device among the plurality of display devices detects a door opening, obtaining identification information for the first display device along with a second door opening signal from the first display device.

10. In Paragraph 9, The step of identifying information regarding the opening of the door is, A step of identifying the location of the first display device based on identification information for the first display device; and A control method comprising the step of controlling an identified first display device to display a door open state.

11. In a display system, Video playback device for transmitting video data; A plurality of display devices that receive and display video data from the above video playback device, and detect the opening of a door and output a door opening signal to prevent leakage of the video data; and A display system comprising: a video control device that identifies the opening of a door in real time based on the door opening signal output from the plurality of display devices, and when the opening of the door is identified, transmits the door opening signal to the video playback device to block the transmission of the video data.

12. In Paragraph 11, The above display device is, Cabinet; A display panel provided on one side of the cabinet; A door provided on the other side of the cabinet to open and close the cabinet; Memory for storing instructions; At least one processor including a processing circuit; A door opening detection unit that detects the opening of the door and outputs a door opening signal when the opening of the door is detected; and A display system comprising: an interface for transmitting and receiving signals with the above-mentioned video playback device and video control device.

13. In Paragraph 12, When the above instructions are executed individually or collectively by the at least one processor, the display device, A display system that, when the opening of the door is detected while receiving video data from the video playback device, transmits a first door opening signal to the video control device in real time based on the output voltage of the door opening detection unit, which is connected to the video control device and whose voltage applied according to the opening and closing of the door varies.

14. In Paragraph 12, The above memory further stores identification information of the display device, and When the above instructions are executed individually or collectively by the at least one processor, the display device, A display system that, when the opening of the door is detected while receiving video data from the video playback device, transmits identification information stored in the memory along with a second door opening signal output from the door opening detection unit to the video control device.

15. In Paragraph 14, When the above instructions are executed individually or collectively by the at least one processor, the display device, When a control signal for displaying the door open status is received from the above-mentioned video control device, A display system that stops the display of the above-mentioned video data and displays a preset door status display video.

Images