Digital display device allowing remote disruption of content propagation

Abstract

A digital display device (Di sp3a, Di sp3b), comprising:-a digital screen (Ecr); -a first receiver (Rec1) capable of receiving the first content via the first communication channel; -a second receiver (Rec2) capable of receiving messages via a second communication channel; -a first player (Lec1) capable of playing the first content received through the first communication channel on a digital screen; and a switch (Comm) configured to stop playing of the first content by the first player when the message is received by the second receiver.

Description

Technical Field

[0001] The present invention belongs to the field of digital screens, and more specifically, belongs to the field of digital display device control. Background Art

[0002] Digital display devices are devices used to play digital content. Digital content can include, for example, advertisements, and can also include information and awareness campaigns.

[0003] The digital display device may for example be in the form of a large screen arranged in a public place, such as in a subway station, a storefront of a building or a passenger waiting hall.

[0004] Digital displays are particularly well suited for widespread content campaigns, such as advertising or awareness campaigns. Modern digital displays are typically connected to a carrier's infrastructure via a high-speed connection, such as fiber, 4G or 5G, through which the carrier can send content and the instructions to play that content.

[0005] Such content may include images, text, and video, as well as instructions for playing the content. A digital display device typically includes a playlist that defines the content that the display device displays over successive periods of time.

[0006] While digital display devices offer a particularly attractive solution for widespread distribution of content, circumstances may arise where the channel through which the display device receives content may be compromised, which could allow an individual with ill intent to broadcast malicious or inappropriate content.

[0007] This is even more harmful when the channel receiving the content is compromised, as this may prevent the operator from sending corrective messages through that channel. Therefore, a technician may need to be dispatched to the site to manually reboot the digital screen. However, this operation is time-consuming and costly, and may also delay preventing the malicious message from being played.

[0008] One approach to addressing this problem could include making the channel through which the content is received more reliable, such as by encrypting the communication. However, making the communication channel completely impervious to hacking is difficult, and this does not eliminate the need for manual intervention when the communication channel is compromised.

[0009] Therefore, there is a need for a digital display device that can automatically stop playing malicious content when the communication channel that normally receives the content is damaged.

[0010] Another problem encountered with digital display devices in the prior art is that they only receive content from their operators. Therefore, they cannot be used to broadcast more extensive messages, such as emergency messages broadcast by official departments other than the device operator.

[0011] Therefore, another need is for a display device that can play emergency messages played by official departments other than the device operator. Summary of the invention

[0012] The present disclosure aims to improve this situation.

[0013] The present invention proposes a digital display device, comprising: at least one digital screen; at least one first receiver, capable of receiving at least one first content through a first communication channel; at least one second receiver, different from the at least one first receiver, capable of receiving at least one message through a second communication channel, the second communication channel being different from the first communication channel; a first player, capable of playing at least one first content received through the first communication channel on at least one digital screen; and a switch, configured to stop the first player from playing at least one first content when a message is received through the at least one second receiver.

[0014] A "receiver" is a module capable of receiving information via a communication channel. If the communication channel is a radio communication channel, the receiver may, for example, include an antenna and a decoder. If the communication channel is a wired or optical fiber type communication channel, the receiver may include a converter and a decoder for signals received by the wired or optical fiber communication.

[0015] "Communication channel" refers to a set of basic elements that allow communication between two terminals. For example, a communication channel can be a wired communication channel, such as an optical fiber or ADSL network, or a wireless communication channel, such as a 4G, 5G, LoRa or satellite connection.

[0016] This allows remote stopping of playback of malicious or inappropriate content received via the first communication channel. Furthermore, stopping playback of malicious content can be accomplished almost instantly even if the first communication channel is compromised. This also allows authorities other than the device operator to stop playback of the first content in order to play an emergency message in its path.

[0017] According to another aspect, a management system for devices is provided, comprising: a display device according to one of the embodiments of the present invention; an operator infrastructure communicating with the display device via a first communication channel; and a platform communicating with the display device via a second communication channel.

[0018] According to another aspect, a method (Process) for controlling a digital display device is proposed, comprising: receiving at least one first content of a first communication channel by at least one receiver of the device; playing at least one first content on at least one digital screen of the device through a first player of the device; receiving at least one message of a second communication channel different from the first communication channel through at least one second receiver of the device, which is different from the at least one first receiver; and stopping the first player from playing the at least one first content through a switch of the device when at least one message is received.

[0019] According to another aspect, a computer program is proposed, comprising instructions for implementing a method according to any one of the embodiments of the invention.

[0020] According to another aspect, a non-volatile computer-readable recording medium is provided, on which a program is stored, which, when executed by a processor, is used to implement a method according to one of the embodiments of the present invention.

[0021] According to another aspect, a computer program is provided, comprising instructions for implementing all or part of the method according to the invention when the program is executed by a processor.

[0022] According to another aspect, a non-volatile, computer-readable recording medium having the program recorded thereon is provided.

[0023] The features of the following contents may be selectively implemented independently or in combination:

[0024] Advantageously, the device comprises a second player capable of displaying on the digital screen a message received by at least one second receiver or a second content associated with the message received by the second receiver, and wherein the switch is configured to activate playback by the second player upon receipt of the message.

[0025] This allows alternative content to be played even if the first player is compromised, thereby increasing the security of the device. This also makes it possible to configure a player specifically for playing content related to the message.

[0026] Advantageously, the device comprises at least one first processing unit for implementing the first player and the first receiver, and at least one second processing unit, different from the at least one first processing unit, for implementing the second receiver and the switch.

[0027] "Processing unit" refers to an electronic component that can perform electronic or computer operations to achieve a set of functions. A processing unit can refer to any type of electronic processor or component that can perform digital operations. For example, a processing unit can be an integrated circuit, an ASIC ("Application Specific Integrated Circuit"), a microcontroller, a microprocessor, a DSP ("Digital Signal Processor"), a processor, and a GPU ("Graphics Processing Unit"). The processing unit according to the present invention is not limited to a specific type of processing architecture. For example, a processor can implement a Harvard or von Neumann type architecture.

[0028] This can further improve the security of the digital image broadcasting device, because even if the first communication channel and / or the first player is destroyed, stopping the playback of the first content will be completed by a processing unit that is completely independent of the first receiver and the first player.

[0029] Advantageously, the switch is a software module comprised in the first player.

[0030] This allows for a simple and flexible architecture.

[0031] Advantageously, the first or second player is configured to play the second content associated with the message.

[0032] Play content associated with a message, for information that is played without delay, such as an emergency message that concerns everyone, or a message related to stopping the playback of malicious messages.

[0033] Advantageously, the first player or the second player is configured to be able to convert the text content of the message into a video representing the message content and play the video on the screen.

[0034] The advantage of converting the text content of the message into video content to be displayed is that the attention of passers-by can be immediately attracted by the video presentation, while only a very light text message needs to be transmitted, which makes it possible, for example, to play the message very quickly and avoid message loss, or to send the message over a low bit rate network.

[0035] Advantageously, the second receiver is configured to receive second content associated with the message, and the first player or the second player is configured to play the second content on the screen.

[0036] This allows the playback of the first content to be replaced instantly with the playback of the second content.

[0037] Advantageously, the first communication channel is a high-speed connection of an infrastructure of an operator of the display device and the at least one first content comprises video content.

[0038] A "high-speed connection" is one that allows for greater data rates, such as a Wi-Fi, 4G, or 5G connection.

[0039] This makes it feasible to receive and play standard high-capacity content, such as video. It also enables the rapid change of standard content to be played.

[0040] Advantageously, the second communication channel comprises a long-range radio connection.

[0041] This enables the display device to receive messages from the remote platform via the second communication channel.

[0042] Advantageously, the second receiver is in local communication with the satellite receiver.

[0043] This enables the satellite connection to be utilized even if the display device itself is located in a location where satellite signals cannot be received.

[0044] Advantageously, the second communication channel comprises a low-rate radio connection.

[0045] A "low-rate radio connection" refers to a radio connection that can only transmit messages at a lower rate, such as an SMS or LoRa connection.

[0046] This enables devices to receive messages over reliable, including long-distance connections, and to transmit messages over long distances using existing networks.

[0047] Advantageously, the second communication channel is a communication channel with an emergency management platform, the platform being configured to send an emergency message to the second receiver via the second communication channel when a catastrophic event occurs.

[0048] "Platform" refers to the infrastructure used for specialized tasks involving communication with remote devices. The platform may include, for example, computers, servers, storage devices, etc., so as to send messages to display devices when specific events occur.

[0049] This enables the emergency management platform to broadcast emergency messages widely to all digital display devices of multiple operators, enabling widespread and rapid dissemination of emergency messages to the public. This enables a rapid response to catastrophic events on a national or regional scale.

[0050] Advantageously, the second communication channel is a communication channel with the platform, and the platform is configured to send a stop message to the second receiver via the second communication channel upon detecting that the display device is damaged.

[0051] This makes it possible to stop playing malicious messages on the display device without delay once the first player and / or the first communication channel are detected to be damaged, which greatly improves the security of the digital display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Additional features, details and advantages will become apparent upon reading the following detailed description and analyzing the accompanying drawings, in which:

[0053] Figure 1

[0054] Figure 1 An example of a security architecture is shown in which the present invention may be implemented.

[0055] Figure 2

[0056] Figure 2 An example is shown in which the present invention may be implemented through an architecture for detecting and blocking malicious messages.

[0057] Figure 3a

[0058] Figure 3a A first example of a digital display device according to a set of embodiments of the present invention is shown.

[0059] Figure 3b

[0060] Figure 3b A second example of a digital display device according to a set of embodiments of the present invention is shown.

[0061] Figure 4

[0062] Figure 4 An example in which an indoor digital display device according to an embodiment receives a satellite signal is shown.

[0063] Figure 5

[0064] Figure 5 An example of local detection of a vandalized digital display device according to an embodiment is shown.

[0065] Figure 6

[0066] Figure 6 An example of a method according to an embodiment is shown. DETAILED DESCRIPTION

[0067] Reference now Figure 1 .

[0068] Figure 1 An example of a security architecture is shown in which the present invention may be implemented.

[0069] exist Figure 1 In the illustrated architecture, the emergency management center Ctr1 detects catastrophic events that may result in human attacks (e.g., terrorist attacks) or natural disasters (e.g., floods, forest fires, etc.), and sends information and / or instruction messages to the public when a disaster is detected.

[0070] The emergency management center Ctr1 may be, for example, a center at a national or regional level.

[0071] One channel that the center Ctr1 uses to send messages to the public includes digital display devices such as billboards. This type of device has the advantage of appearing in many areas where people often gather (train stations, passenger waiting halls, shopping malls, etc.) and usually has very high visibility.

[0072] exist Figure 1 In the example of FIG. 1 , three digital display devices Disp11 , Disp12 , and Disp13 are shown.

[0073] When a catastrophic event occurs, the center Ctr1 is configured to send messages to as many digital display devices as possible at the same time. The sending of messages can be accomplished in a variety of ways. Figure 1 For example, a message could:

[0074] - Res11 is sent to the device Disp11 via a mobile network (SMS, 4G, 5G, etc.);

[0075] - Send to device Disp12 via a low-speed and long-distance network Res12 (e.g., a Lora-type network);

[0076] - It is sent to the device Disp13 via antenna Ant1 and satellite Sat1.

[0077] Each of these transmission methods has its own advantages. For example, the mobile network Res11 usually has a wide range, the low-speed and long-distance network Res12 can send messages to long distances, including areas that are poorly served by traditional mobile networks, while transmission via satellite Sat1 can reach the entire territory.

[0078] However, these examples of transmission networks are provided only as non-limiting examples. According to the invention, any network capable of sending messages from the center Ctr1 to the digital display devices may be used.

[0079] After receiving the emergency message, each device Disp11, Disp12 and Disp13 is configured to stop playing the current content, such as the current advertising campaign, to play the emergency message sent by the center Ctr1.

[0080] This architecture therefore enables the rapid and widespread dissemination of emergency messages to the population, enabling a rapid response to catastrophic events.

[0081] In some cases, the emergency message may be accompanied by content to be played, such as providing information about the current disaster and a video about safety precautions. In this case, the devices Disp11, Disp12 and Disp13 can be configured to play the content associated with the emergency message.

[0082] Reference now Figure 2 .

[0083] Figure 2 An example is shown in which the present invention may be implemented through an architecture for detecting and blocking malicious messages.

[0084] exist Figure 2 In the example, a digital display device Disp2 is managed by an operator Op2. The operator Op2 includes an infrastructure Infra, which is configured to send at least one first content to be displayed to the device Disp2 through a first communication channel Can21. For example, the infrastructure Infra can be an infrastructure for broadcasting an advertising campaign, and sends the advertisement to be displayed to the device Disp2. The first communication channel Can21 can include optical fiber, Wi-Fi, high-speed mobile network, etc.

[0085] In some cases, the first channel Can21 may be attacked or compromised, which means that a malicious individual may compromise the channel Can21 to display malicious content on the device Disp2. Malicious content generally refers to content that is not prepared by the operator Op2. For example, it may involve content with pornographic, hateful, deceptive or discriminatory content, or more generally, content that is not approved by the operator Op2.

[0086] The playback of malicious content can be detected in a variety of ways. For example, the first channel Can21 can cause the device Disp2 to send a receipt message or a playback report to the infrastructure Infra. If there is no message or the message is inconsistent, it can be detected that the first communication channel Can21 is damaged.

[0087] The playing of malicious content may also be detected by user Uti2, who observes the playing of malicious content while passing in front of device Disp2 and alerts the operator.

[0088] After detecting malicious content, the operator's security platform Plat sends a stop message to the device Disp2 through the second communication channel Can22. After receiving the stop message, the device Disp2 immediately stops playing the malicious content. The device Disp2 can also display the text or video content associated with the stop message instead of the malicious content.

[0089] By sending a stop message through a second channel Can22 that is different from the first channel Can21, even if the first channel Can21 cannot be used by the operator Op2 due to damage, the malicious content can be stopped from playing immediately.

[0090] We will now examine in more detail the structure of a digital display device according to the invention in a set of embodiments.

[0091] Reference now Figure 3a .

[0092] Figure 3a An example of a digital display device Disp3a according to a set of embodiments of the present invention is shown.

[0093] The digital display device Disp3a is a device capable of displaying digital contents. For example, it can be an advertisement display device for displaying advertising activities, information or promotional activities, and / or messages useful to the public.

[0094] Therefore, the digital display device Disp3a can be placed, for example, in front of a building, a railway station, a commercial center, a subway station, a passenger waiting hall, etc. In general, the digital display device Disp3a can be placed in any public or private space that can be seen by passers-by.

[0095] The digital display device Disp3a includes at least one screen Ecr. The at least one screen Ecr can display text, images and videos. The digital display device Disp3a may also include one or more speakers for playing audio tracks, such as when playing videos.

[0096] The digital display device further includes a first receiver Rec1 capable of receiving at least one first content through a first communication channel.

[0097] The first content may be standard content. "Standard content" refers to content that is usually played by a digital display device. Standard content may appear in the form of, for example, images, text or video.

[0098] As mentioned above, standard content corresponds to content that is typically played by digital display devices, such as:

[0099] - Advertising campaigns;

[0100] - Information activities;

[0101] - etc.

[0102] The first content may appear in various types of media forms, such as text, image, or video.

[0103] The first communication channel can be of various types. It can especially involve a high-speed connection to an infrastructure Infra of a display device operator.

[0104] The infrastructure Infra can be in particular a central infrastructure of a display device operator, which makes it possible to broadcast content to various display devices and issues instructions for broadcasting content. The infrastructure can include, for example, computers, servers, storage devices, etc., for storing and sending digital content.

[0105] The use of high-speed connections, such as 4G, 5G, ADSL or fiber optic connections, makes it possible to broadcast standard, high-volume content while also being able to quickly change the standard content to be sent.

[0106] The display device Disp3a also includes a first player Lec1 capable of playing at least one first content received through the first communication channel on at least one digital screen.

[0107] The player Lec1 thus enables the standard content to be played on the screen. The player Lec1 can directly play the first content, such as a video, or modify it before playing it. For example, the player Lec1 can modify the content to fit the screen, such as by adjusting an oversized video so that it can be played on the screen, adjusting the brightness of multiple consecutive videos, etc.

[0108] The player Lec1 can define a playlist for the content to be played. For example, at least one first content received by the first receiver can be gradually included in the playlist, and the first player Lec1 can play the items in the list one by one. The replay management of the list playback can be performed in various ways. For example, the first player Lec1 can assign a play time or a percentage of the play time to each item in the list. The played items can also be played preferentially at certain times (hours / days, etc.) to adapt to the people moving in front of the digital display device.

[0109] The first receiver and the first player are thus able to play at least one first content sent by the digital display device operator.

[0110] However, the first communication channel may be compromised. For example, an individual with bad intentions may compromise the communication channel to broadcast a malicious message. In this case, the display device operator may not be able to recover the situation through the first communication channel because it has been compromised.

[0111] The first channel also does not allow official departments other than the display device operator to display messages on the device. For example, the first communication channel may not allow Figure 1 The emergency management center Ctr1 shown in FIG. 1 sends an emergency message to the device Disp3a.

[0112] To address these issues, the device Disp3a also includes:

[0113] - at least one second receiver Rec2 capable of receiving at least one message via a second communication channel;

[0114] - The switch Comm is configured to stop the first player from playing at least one first content when receiving a message through at least one second receiver.

[0115] In this way, after receiving the message through the second communication channel, the current display will be interrupted immediately without using the first communication channel.

[0116] The second communication channel may be a communication channel with the platform Plat, which may be, for example, a platform of an equipment operator, or an official platform of a country or region.

[0117] For example, the platform Plat may be a platform configured by an operator, for sending a stop message to the second receiver through the second communication channel when it is detected that the display device is damaged.

[0118] This enables the display device operator to send a stop message to the display device upon detecting that the device has been compromised, thereby stopping the playback of malicious messages without delay. Furthermore, since the second communication channel is different from the first communication channel, the disruption of the first communication channel does not affect the possibility of receiving the stop message via the second communication channel. Therefore, once a malicious message is detected, its playback can be stopped.

[0119] like Figure 2 As mentioned above, detecting the broadcast of malicious messages can be done in a number of ways:

[0120] - The digital display device may be configured to send a playback report to the operator's infrastructure via the first or second communication channel. If no report or a report different from the expected report is detected, a stop message may be sent to the display device via the second channel;

[0121] - The playback of malicious or inappropriate content can be detected by passing users and alert the display device operator;

[0122] - etc.

[0123] In this way, even if the first communication channel is destroyed and cannot be used, the display device operator can stop the playback of malicious content after detecting it, thereby greatly improving the security of the digital display device.

[0124] The platform Plat may also be an emergency management platform configured to send an emergency message to the second receiver via the second communication channel when a catastrophic event occurs.

[0125] In this case, the platform Plat can be a national or regional platform for sending emergency messages. For example, it can be a platform for sending messages in the event of an attack (terrorism, germ alerts, etc.), an industrial disaster or a natural disaster (earthquake, flood, etc.).

[0126] Regardless of the source of the message received through the second communication channel, the first player may be configured to not only stop playing the first content but also read the content associated with the message received through the second communication channel.

[0127] If the message is an emergency message, playing the content associated with the emergency message enables the emergency management platform to broadcast the emergency message broadly to all digital display devices of multiple operators, thereby enabling widespread and rapid dissemination of the emergency message to the population. This enables rapid response to catastrophic events on a national or regional scale.

[0128] If the message is a message to stop playing malicious content, playing the content associated with the stop message may, for example, play a message stating that the display device is temporarily unavailable and will be repaired as soon as possible, or any other message related to stopping playing malicious content.

[0129] Playing the content associated with the message received through the second communication channel may consist of simply displaying the text content of the message.

[0130] The text content of the message can also be converted into video content to be displayed on the screen.

[0131] For example, the text content of the message can be analyzed by the first player and converted into a video that visually represents the content. For example, if the message is an emergency message announcing an impending flood, a video showing the flood can be played with an accompanying text message indicating that the flood is imminent and asking people to take shelter. Such a video can, for example, be automatically generated by the first player or retrieved from a library of various possible warning message videos stored in the display device.

[0132] For example, a digital display device may contain a library of videos corresponding to various alert messages, where the videos are associated with tags. For example, a video may contain tags related to the type of message (e.g., #terrorism, #flood, etc.), and may also contain other characteristics of the video, such as location (#city, #mountain, etc.), season (#winter, #summer, etc.), etc. The text content of the message may contain one or more tags corresponding to the type of video to be played, and the display device may select a video based on the associated tags. In this way, tags make it possible to select the most appropriate video based on the content (message type) and context (playback environment).

[0133] The advantage of converting the text content of the message into video content to be displayed is that it can instantly attract the attention of passers-by with video effects, while only a small message needs to be transmitted, which helps to play the message very quickly and avoid message loss or sending the message over a low-speed network.

[0134] The second receiver may also be configured to receive content associated with the message. For example, the platform Plat may send video content in parallel with the message, which will be played by the first player, possibly in parallel with the text content played from the message.

[0135] In this way, the first content that stops playing can be replaced instantly by displaying the second content associated with the message on the screen Ecr. For example, in the event of a disaster, the second content can include information or instructions provided to the public. In this way, the information or instruction message in the disaster situation can be widely broadcast.

[0136] The second communication channel may be of various types.

[0137] For example, it may involve a long-distance radio connection, such as radio communication using a relay antenna, according to the LoRa standard, or via satellite.

[0138] Satellite connections have the particular advantage of being able to broadcast emergency or warning messages widely over a territory.

[0139] In case of a satellite connection, the second receiver can communicate locally with the satellite receiver.

[0140] For example, the display device may be located inside a building (an airport, a train station, a shopping mall, etc.) and communicate via a local connection (e.g., Ethernet, Bluetooth, Wi-Fi, etc.) to a satellite receiver located on the roof of the building or other nearby area that can receive satellite signals. Examples of such implementations are described in Figure 4 Described in more detail in .

[0141] In this way, the display device can receive messages sent via satellite even if it is located indoors or, more generally, in an area where satellite signals cannot be received.

[0142] This enables the satellite connection to be utilized even if the display device itself is located in a location where satellite signals cannot be received.

[0143] The second communication channel may also include a low-rate radio connection, such as an SMS or LoRa connection. These connections are used to reliably send simple messages over long distances, while leveraging existing infrastructure and being able to send messages to areas not covered by cellular networks.

[0144] exist Figure 3a In the example of , the switch Comm is a software module of the player Lec1. Therefore, stopping the playing of the first content and the optional playing of the second content received through the second communication channel are directly completed in the first player Lec1, which enables a simple and flexible architecture.

[0145] The device Disp3a, the infrastructure Infra and the platform Plat constitute a management system Sys3a of the display device Disp3a.

[0146] Reference now Figure 3b .

[0147] Figure 3b A second example of a digital display device according to a set of embodiments of the present invention is shown.

[0148] The device Disp3b includes at least one first receiver Rec1, at least one second receiver Rec2, at least one first player Lec1 and second player Lec2, which are the same as those of the device Disp3a. Figure 3a All embodiments described in are respectively applicable to the device Disp3b, except for the switch Comm integrated in the first player Lec1.

[0149] In contrast, in the device Disp3b, the switch Comm is different from the first player Lec1.

[0150] This serves to increase the security of the device Disp3b, since even if the first player Lec1 is destroyed, the switch Comm can still operate.

[0151] In one set of embodiments of the present invention, the device Disp3b may further include a second player capable of playing the message received by the second receiver or the second content associated with the message on the digital screen. In this case, the switch is not only configured to stop the first player from playing the first content, but also configured to activate the second player from playing the second content when the message is received, thereby displaying the second content.

[0152] This further enhances the security of the device, since the second player Lec2 is independent of the first player Lec1, so that even if the first player Lec1 is destroyed, the second player Lec2 can still function.

[0153] In addition, the second player Lec2 can be used exclusively for playing stop or emergency messages. Figure 3a All functions discussed in relation to playing the second content associated with the message, including playing text content and video content associated with the message or generating and playing video content associated with the message, can be implemented in the player Lec2.

[0154] like Figure 3b As shown, the switch can be located between the first player Lec1, the second player Lec2 and the screen. Therefore, the switch can activate or stop one of the players by selecting one of the input sources to be sent to the screen.

[0155] The various elements of the device Disp3b, in particular the first player Lec1, the second player Lec2, the first receiver Rec1, the second receiver Rec2 and the switch Comm, can be implemented in different ways.

[0156] For example, each element may include a software module executed by one or more processing units.

[0157] In particular, the device Disp3b may include:

[0158] - At least one first processing unit, for implementing the first player Lec1 and the first receiver Rec1. A single first processing unit or a plurality of different first processing units may be used to implement the first player Lec1 and the first receiver Rec1;

[0159] - At least one second processing unit, different from at least one first processing unit, is used to implement the second receiver Rec2 and the switch Comm. In an embodiment of the present invention including a second player Lec2, at least one second processing unit may also implement the second player Lec2. A single second processing unit or a plurality of different second processing units may be used to implement the second player Lec2, the second receiver Rec2 and the switch.

[0160] In this way, two processing units or two different sets of processing units are used:

[0161] - On the one hand, it is used to implement a standard content reception and playback chain, including a first receiver Rec1 and a first player Lec1;

[0162] -On the other hand, a chain for implementing stopping the playing of the first content and playing the second content at an appropriate time includes a switch Comm, a second receiver Rec2 and a second player Lec2 in some embodiments.

[0163] This helps to further improve the security of the device 3b, because even if the first content playback chain is completely destroyed, the chain of stopping the first content playback and the chain of playing the second content in due course can still continue to work.

[0164] In a set of embodiments of the present invention, the various elements constituting the device Disp3b may be arranged in different physical units, such as different circuit boards or printed circuits, and connected to each other via wired or network connections.

[0165] For example:

[0166] - The at least one first receiver Rec1 may be connected to the first player Lec1 via a TCP / IP connection;

[0167] - The first player Lec1 can be connected to the switch Comm via HDMI;

[0168] - The at least one second receiver Rec2 may be connected to the second player Lec2 via a serial port;

[0169] - The second player Lec2 can be connected to the switch Comm via a serial port and an HDMI connection. The HDMI connection is used to send the content to be played (e.g., video content) from the second player Lec2 to the switch Comm. The serial port connection is used to allow the player Lec2 to send a command to the switch Comm to switch the source of the content played on the screen, from the player Lec1 to the player Lec2;

[0170] - The switch Comm can be connected via HDMI to connect to the screen Ecr.

[0171] The device Disp3b, the infrastructure Infra and the platform Plat constitute the management system Sys3b of the display device Disp3b.

[0172] Reference now Figure 4 .

[0173] Figure 4 An example of an indoor digital display device receiving a satellite signal according to an embodiment of the present invention is shown.

[0174] As described above, in one set of embodiments of the present invention, a digital display device located in an area where satellite signals cannot be received (eg, indoors) can receive messages sent via satellite via a satellite receiver locally connected thereto.

[0175] exist Figure 4 In the example shown in FIG. 4 , four digital display devices Disp41 , Disp42 , Disp43 , and Disp44 are located in a building and cannot receive a message sent by a satellite Sat4 because the satellite signal is blocked by a partition, such as a wall or ceiling of the building.

[0176] The digital display devices Disp41 , Disp42 , Disp43 , and Disp44 may be located, for example, in an airport, a train station, or a shopping mall.

[0177] In this example, the building is equipped with an antenna Ant4, connected to a satellite signal receiver RecSat4 located outside the building (e.g. on the roof). Receiver RecSat4 can freely receive signals sent by satellite Sat4.

[0178] The signal is then directed to the devices Disp41, Disp42, Disp43 and Disp44, for example via a repeater Rep4 connected to the receiver RecSat4. The repeater Rep4 may for example comprise a Wi-Fi router.

[0179] In this way, all the digital display devices Disp41, Disp42, Disp43 and Disp44 can receive messages such as alarms or emergency messages via satellite even if they are located indoors and cannot directly receive signals sent by satellite.

[0180] Reference now Figure 5 .

[0181] Figure 5 An example of local detection of a compromised digital display device according to an embodiment of the present invention is shown.

[0182] More precisely, Figure 5 A city map is shown showing seven digital display devices, Dsp51, Disp52, Disp53, Disp54, Disp55, Disp56 and Dsp57 (in reality, the number of digital display devices managed by a single operator is much larger, potentially running into the hundreds of thousands, located in numerous venues, potentially in multiple countries).

[0183] When local damage Corr5 of three devices Disp51, Disp52 and Disp53 is detected, stop messages may be selectively sent to the three devices Disp51, Disp52 and Disp53 to stop playing malicious contents on these devices.

[0184] However, this example is only a non-limiting example of selectively sending messages to a subset of digital display devices. According to various embodiments of the present invention, when a subset of available devices is detected to be damaged, a stop message can be sent to the digital display devices based on various criteria. For example, the message can be sent to:

[0185] - All display devices within a specific area;

[0186] - All devices with specific technical characteristics (e.g. version numbers in which security flaws have been found);

[0187] -etc.

[0188] In all cases, messages may be sent simultaneously to a collection of devices that are detected to have been compromised to simultaneously stop the display of malicious messages on those devices.

[0189] This example demonstrates the display management capability of a digital display device system according to a set of embodiments of the present invention, namely, immediately stopping the playback of malicious messages on all devices affected by the damage.

[0190] Reference now Figure 6 .

[0191] Figure 6 shows a method for controlling such Figure 3a and 3b The method (Process) P6 of the digital display device of the devices Disp3a and Disp3b shown.

[0192] The method P6 comprises a first step S61 of receiving at least one first content through a first communication channel using at least one first receiver Rec1 of a device.

[0193] It comprises a second step S62 of playing at least one first content on at least one digital screen Ecr of the device using a first player Lec1 of the device.

[0194] The method P6 then comprises a third step S63 of receiving at least one message through the second communication channel using at least one second receiver Rec2 of the device.

[0195] Finally, the method P6 comprises a fourth step S64, stopping the device by means of the switch Comm upon receiving at least one message, and stopping the first player from playing at least one first content.

[0196] In method P6, respectively, reference Figure 3a and 3b All embodiments discussed.

[0197] The present disclosure is not limited to the above described devices, systems, methods and computer program examples, but also includes all variations that can be thought of by those skilled in the art within the scope of the claimed protection.

Claims

1. A digital display device (Disp3a, Disp3b), comprising: - at least one digital screen (Ecr); - at least one first receiver (Rec1) capable of receiving at least one first content via a first communication channel; at least one second receiver (Rec2), different from said at least one first receiver, capable of receiving at least one message via a second communication channel different from said first communication channel; - a first player (Lec1) capable of playing, on said at least one digital screen, said at least one first content received through said first communication channel; - A switch (Comm), configured to stop the first player from playing at least one first content when a message is received through the at least one second receiver.

2. The device (Disp3b) according to claim 1 comprises a second player (Lec2) capable of displaying a message received by the at least one second receiver or a second content associated with the message received by the second receiver on the digital screen, and wherein the switch is configured to activate the playback of the second player when the message is received.

3. Apparatus according to any preceding claim, comprising: - at least one first processing unit, configured to execute said first player and said first receiver; - at least one second processing unit, different from said at least one first processing unit, for executing said second receiver and said switch.

4. The device (Disp3a) according to any one of claims 1 to 3, characterized in that The switch is a software module included in the first player.

5. The device according to any of the preceding claims, characterized in that The first or second player is configured to play second content associated with the message.

6. The device according to claim 5, characterized in that The first or second player is configured to convert the text content of the message into a video representing the message content and play the video on the screen.

7. The device according to claim 5, characterized in that: - the second receiver is configured to receive a second content associated with the message; -The first or second player is configured to play the second content on a screen.

8. Apparatus according to any preceding claim, characterised in that The first communication channel is a high-speed connection to an infrastructure (Infra) of an operator of the display device, and the at least one first content includes video content.

9. Apparatus according to any preceding claim, characterised in that The second communication channel comprises a long range radio connection.

10. Apparatus according to any preceding claim, characterised in that The second receiver is in local communication with a satellite receiver.

11. Apparatus according to any preceding claim, characterised in that The second communication channel comprises a low rate radio connection.

12. Apparatus according to any preceding claim, characterised in that The second communication channel is a communication channel with an emergency management platform (Plat), and the emergency management platform is configured to send an emergency message to the second receiver through the second communication channel when a catastrophic event occurs.

13. The device according to any one of claims 1 to 9, characterized in that The second communication channel is a communication channel with a platform (Plat), and the platform is configured to send a stop message to the second receiver through the second communication channel when it is detected that the display device is damaged.

14. A management system (Sys3a, Sys3b) for a display device, comprising: - A display device according to any preceding claim; - an infrastructure (Infra) of an operator of the display device, communicating with the display device via the first communication channel; - a platform (Plat), communicating with the display device via the second communication channel.

15. A method (P6) for controlling a digital display device (Disp3a, Disp3b), comprising: - receiving (S61) at least one first content via a first communication channel using at least one first receiver (Rec1) of the device; - using a first player (Lec1) of the device, playing (S62) at least one first content on at least one digital screen (Ecr) of the device; - receiving (S63) at least one message through a second communication channel different from the first communication channel, using at least one second receiver (Rec2) of the device different from the at least one first receiver; - upon receiving the at least one message, stopping (S64) the first player from playing the at least one first content via a switch (Comm) of the device.

16. A computer program comprising instructions for implementing the method according to claim 15 when the program is executed by a processor. 17 . A non-volatile computer-readable storage medium having a program stored thereon, for implementing the method according to claim 15 when the program is executed by a processor.

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