Digital display devices that allow remote interruption of content distribution

Abstract

A digital display device (Disp3a, Disp3b), - Digital screen (Ecr) and a first receiver (Rec1) capable of receiving a first content via a first communication channel; a second receiver (Rec2) capable of receiving messages via a second communication channel; a first player (Lec1) capable of playing on a digital screen a first content received via a first communication channel; a switch (Comm) configured to deactivate playback of the first content by the first player upon receiving the message via the second receiver; and A digital display device (Disp3a, Disp3b) comprising:

Description

[Technical Field]

[0001] The present disclosure is in the field of digital screens, and more particularly, in the field of digital display device control. [Background technology]

[0002] A digital display device is a device with which digital content can be broadcast, which can include, for example, advertising, but also information and awareness campaigns.

[0003] Digital display devices may come in the form of large screens, for example, placed in public spaces, for example in subway stations, in building storefronts, or integrated into shelters for travelers.

[0004] Digital display devices are particularly useful for widely broadcasting content campaigns, such as advertising or awareness campaigns. Modern digital display devices are generally linked to an operator's infrastructure by a high-speed connection, such as a fiber, 4G, or 5G connection, over which the operator can send content and instructions for playing the content.

[0005] The content may comprise, for example, images, text, and video, as well as instructions for playing the content. Accordingly, digital display devices are typically equipped with a playlist that defines the content that is displayed by the display device during successive time slots.

[0006] While digital display devices offer a particularly attractive solution for widely broadcasting content, it is possible for the channel for receiving content to be corrupted by the display device, thereby enabling malicious individuals to broadcast malicious or inappropriate content.

[0007] This situation is even more harmful when the corruption of the channel for receiving content may prevent the operator from sending a corrective message over this channel. It may then be necessary to send a technician to the site to manually restart the digital screen. However, this action is long and costly and may delay stopping the broadcast of malicious messages.

[0008] One solution to this problem may consist of making the channel for receiving the content more reliable, for example by encrypting the communication. However, making the communication channel completely unbreakable is difficult, and so does not eliminate the need to resort to manual action in the event of a communication channel being broken.

[0009] Therefore, there is a need for digital display devices to automatically stop the broadcast of malicious content in the event of a breakdown of the communication channel over which the content is typically received.

[0010] Another problem encountered with digital display devices from the prior art is that they receive content only from their operator, and therefore cannot be used to broadcast more global messages, for example, broadcasting emergency messages broadcast by authorities other than the device's operator.

[0011] Therefore, there is also a need for a display device that is capable of broadcasting emergency messages broadcast by authorities other than the device's operator. Summary of the Invention [Problem to be solved by the invention]

[0012] The present disclosure aims to improve this situation. [Means for solving the problem]

[0013] Proposed is a digital display device comprising: at least one digital screen; at least one first receiver capable of receiving at least one first content via a first communication channel; at least one second receiver, separate from the at least one first receiver, capable of receiving at least one message via a second communication channel, separate from the first communication channel; a first player capable of playing the at least one first content received via the first communication channel on the at least one digital screen; and a switch configured to deactivate playing of the at least one first content by the first player upon receipt of the message by the at least one second receiver.

[0014] A "receiver" is understood to mean a module capable of receiving information by a communication channel. If the communication channel is a wireless communication channel, the receiver may comprise, for example, an antenna and a decoder. If the communication channel is a wired or fiber optic type communication channel, the receiver may comprise a converter for signals received by wired or fiber optic communication and a decoder.

[0015] A "communication channel" is understood to mean a set of elements that enable communication between two terminals. For example, the communication channel may be a wired communication channel, such as a fiber optic or ADSL network, or a wireless communication channel, such as a 4G, 5G, Lora, or satellite connection.

[0016] This allows for remotely stopping the broadcast of malicious or inappropriate content received over the first communication channel. Furthermore, stopping the broadcast of malicious content can occur nearly instantaneously even if the first communication channel is corrupted. This also allows authorities other than the device operator to stop the broadcast of the first content in order to broadcast an emergency message instead.

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

[0018] According to another aspect, a process is proposed for controlling a digital display device, the process comprising: receiving at least one first content via a first communication channel by at least one first receiver of the device; playing the at least one first content on at least one digital screen of the device by a first player of the device; receiving at least one message via a second communication channel separate from the at least one first receiver by at least one second receiver of the device, separate from the first communication channel; and deactivating, upon receiving the at least one message, the playing of the at least one first content by the first player by a switch of the device.

[0019] According to another aspect, a computer program is proposed, comprising instructions for carrying out a process according to one of the embodiments from the present disclosure.

[0020] According to another aspect, a non-volatile computer-readable storage medium is proposed having stored thereon a program for use by a process according to one of the embodiments of the present disclosure when the program is executed by a processor.

[0021] According to another aspect, a computer program is proposed, comprising instructions for carrying out all or part of a process as described in the present disclosure, when said program is executed by a processor.

[0022] According to another aspect, a non-volatile computer readable recording medium is proposed on which such a program is recorded.

[0023] The features disclosed in the following paragraphs can in some cases be implemented independently of each other or in combination with each other.

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

[0025] This makes it possible to broadcast replacement content even in case of damage to the first player and thus improve the security of the device. It also makes it possible to deploy a player that is particularly suited to playing the content connected 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, separate from the at least one first processing unit, for implementing the second receiver and the switch.

[0027] A "processing unit" is understood to mean an electronic component capable of performing electronic or computer calculations to perform a collective function. A processing unit may refer to any type of electronic processor or component capable of performing digital calculations. For example, a processing unit may 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"). A processing unit according to the present invention is not limited to a particular type of processing architecture. For example, a processor may implement a Harvard or von Neumann architecture.

[0028] This makes it possible to further improve the security of the digital image broadcasting device, since in the event of damage to the first communication channel and / or the first player, deactivation of playback of the first content is performed by a processing unit that is completely independent of the first receiver and the first player.

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

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

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

[0032] Playing content associated with a message is useful for broadcasting important messages without delay, for example, emergency messages that are important to the entire population, or messages related to stopping the broadcast of malicious messages.

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

[0034] By converting the text content of the message into video content to be displayed, it is advantageously possible to have only a very light text message to be transmitted while still benefiting from a video rendering that immediately catches the attention of passersby, thereby making it possible, for example, to broadcast the message very quickly, avoid message loss, or send the message over a low bitrate 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 a screen.

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

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

[0038] "High-speed connection" is understood to mean a connection that allows a large data rate, such as, for example, a Wi-Fi, 4G or 5G connection.

[0039] This allows for the reception and broadcast of large amounts of standard content, e.g., video, and also allows for rapid changes to the standard content to be broadcast.

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

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

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

[0043] This allows the display device to benefit from a satellite connection even when the display device itself is located in a location that prevents it from receiving satellite signals.

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

[0045] "Low rate wireless connection" is understood to mean a wireless connection that allows sending messages only at a reduced rate, such as, for example, an SMS or Lora connection.

[0046] This allows devices to receive messages over reliable connections, including over long distances, and to benefit from existing networks that provide message transmission over long distances.

[0047] Advantageously, the second communication channel is a communication channel with an emergency management platform configured to send an emergency message via the second communication channel to a second receiver in the event of a catastrophe event.

[0048] A "platform" is understood to mean an infrastructure dedicated to a given task involving communication with remote devices. The platform may comprise, for example, computers, servers, storage, etc., with which to send messages to display devices when a given event occurs.

[0049] This allows the emergency management platform to widely broadcast emergency messages to all digital display devices of several operators, and therefore to widely and quickly broadcast emergency messages to the public, thereby enabling rapid response to catastrophic events, either nationwide or regionally.

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

[0051] This allows broadcasting of malicious messages on the display device to be stopped without delay upon detection of corruption of the first player and / or the first communication channel, thereby significantly improving the security of digital display devices.

[0052] Other features, details, and advantages will appear upon reading the following detailed description and examining the accompanying drawings. [Brief explanation of the drawings]

[0053] [Figure 1] FIG. 1 illustrates an example of a security architecture in which the present invention may be implemented. [Figure 2] FIG. 1 illustrates an example of an architecture for detecting and stopping malicious messages in which the present invention may be implemented. [Figure 3a] FIG. 1 illustrates a first example of a digital display device according to a set of embodiments of the present invention. [Figure 3b] FIG. 2 illustrates a second example of a digital display device according to a set of embodiments of the present invention. [Figure 4] FIG. 2 illustrates an example of receiving satellite signals by an indoor digital display device, according to one embodiment. [Figure 5] FIG. 1 illustrates an example of local detection of a damaged digital display device, according to one embodiment. [Figure 6] FIG. 1 illustrates an example of a method according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0054] Reference is now made to FIG.

[0055] FIG. 1 illustrates an exemplary security architecture in which the present invention may be implemented.

[0056] In the architecture shown in Figure 1, the emergency management center Ctr1 detects catastrophe events, which can be man-made attacks (e.g., terrorist attacks) or natural disasters (e.g., floods, forest fires, etc.), and upon detecting a catastrophe, sends information and / or instruction messages to people.

[0057] The emergency management center Ctr1 can be, for example, a national or regional center.

[0058] One of the channels used by center Ctr1 to send messages to people comprises digital display devices such as advertising panels. This type of device has the advantage that it is present in many areas where people often gather (train stations, travel shelters, shopping centers, etc.) and generally has very high visibility.

[0059] In the example from FIG. 1, three digital display devices are shown: Disp11, Disp12, and Disp13.

[0060] When a catastrophe event occurs, the center Ctr1 is configured to send a message simultaneously to the maximum possible number of digital display devices. Sending the message can be done in various ways. In the example from FIG. 1, the message is: - Through the mobile network (SMS, 4G, 5G, etc.) Res11 to the device Disp11, - through a low-speed and long-distance network (for example, a Lora-type network) Res12 to the device Disp12, - can be sent by the antenna Ant1 and the satellite Sat1 to the device Disp13.

[0061] Each of these transmission modes has its advantages: for example, the mobile network Res11 is widely deployed in general, the low-speed and long-distance network Res12 allows sending messages over long distances, including in zones not well served by conventional mobile networks, and transmission by satellite Sat1 helps to reach all areas of the region.

[0062] However, these examples of transmission networks are given only as non-limiting examples: according to the invention, any type of network capable of sending messages from the center Ctr1 to the digital display devices can be used.

[0063] Upon receiving the emergency message, each of the devices Disp11, Disp12, and Disp13 is configured to stop broadcasting ongoing content, for example, a current publicity campaign, in order to broadcast the emergency message sent by the center Ctr1.

[0064] This architecture therefore allows for rapid and widespread broadcast of emergency messages to the population and therefore rapid reaction to catastrophe events.

[0065] The emergency message may possibly be accompanied by content to be broadcast, for example, a video giving information about a current disaster and instructions on precautions to be taken for safety, in which case devices Disp11, Disp12, and Disp13 may be configured to broadcast content associated with the emergency message.

[0066] Reference is now made to FIG.

[0067] FIG. 2 illustrates an example of a security architecture in which the present invention may be implemented.

[0068] In the example from Fig. 2, one digital display device Disp2 is managed by an operator Op2. The operator Op2 comprises an infrastructure Infra configured to send at least one first content to be displayed on the device Disp2 through a first communication channel Can21. For example, the infrastructure Infra may be an infrastructure for broadcasting an advertising campaign and sending advertisements for display on the device Disp2. The first communication channel Can21 may comprise, for example, fiber optics, Wi-Fi, a high-speed mobile network, etc.

[0069] In some cases, the first channel Can21 may be plundered or corrupted, meaning that malicious individuals may compromise the channel Can21 in order to display malicious content on the device Disp2. Malicious content may generally be content not intended by the operator Op2. Malicious content may involve, for example, content with pornographic, hateful, fraudulent, or discriminatory content, or more generally content not approved by the operator Op2.

[0070] The broadcast of malicious content can be detected in various ways. For example, the first channel Can21 can enable the device Disp2 to send reply messages or broadcast reports to the infrastructure Infra. If there are no messages or inconsistent messages, then the corruption of the first communication channel Can21 can be detected.

[0071] The broadcast of malicious content can also be detected by a user Uti2 who, while passing in front of the device Disp2, observes the broadcast of malicious content and alerts the operator.

[0072] Upon detecting the malicious content, the operator's security platform Plat sends a stop message to the device Disp2 through the second communication channel Can22. Upon receiving the stop message, the device Disp2 immediately stops broadcasting the malicious content. The device Disp2 may also display text or video content associated with the stop message instead of the malicious content.

[0073] Therefore, by sending a stop message via a second channel Can22 separate from the first channel Can21, it is possible to immediately stop broadcasting malicious content even if the first channel Can21 is unavailable to the operator Op2 due to corruption.

[0074] Next, we will consider in more detail the structure of the digital display device in the set of embodiments of the present invention.

[0075] Reference is now made to Figure 3a.

[0076] FIG. 3a shows an example of a digital display device Disp3a according to a set of embodiments of the present invention.

[0077] The digital display device Disp3a is a device capable of displaying digital content, and may for example comprise an advertising display device with which to display advertising campaigns, but also information or awareness campaigns and / or messages useful to the public.

[0078] Thus, the digital display device Disp3a may be placed, for example, at the main entrance of a building, in a train station, a commercial center, a subway station, a shelter for travelers, etc. The digital display device Disp3a may generally be placed in any public or private space where the digital display device Disp3a can be seen by passersby.

[0079] The digital display device Disp3a includes at least one screen Ecr, which is capable of displaying text, images, and video. The digital display device Disp3a may also include one or more speakers, for example, for broadcasting a soundtrack when playing a video.

[0080] The digital display device also includes a first receiver Rec1 capable of receiving at least one first content over a first communication channel.

[0081] The first content may be standard content. "Standard content" is understood to mean content that is normally broadcast by a digital display device. The standard content may come in the form of, for example, images, text, or video.

[0082] As indicated above, standard content corresponds to content typically broadcast by digital display devices; - advertising campaigns, - information campaigns, - And others.

[0083] The first content may come in the form of various types of media, such as text, images, or video.

[0084] The first communication channel may be of various types: The first communication channel may in particular involve a high-speed connection with the infrastructure Infra of the operator of the display device.

[0085] The infrastructure Infra may in particular be the central infrastructure of a display device operator, which allows broadcasting content to various display devices and giving instructions for broadcasting content. The infrastructure may comprise, for example, computers, servers, storage, etc., with which to store and transmit digital content.

[0086] The use of high speed connections, such as 4G, 5G, ADSL, or fiber optic connections, makes it possible both to broadcast large amounts of standard content and also to rapidly change the standard content that is being sent.

[0087] The display device Disp3a also comprises a first player Lec1 capable of playing at least one first content received via a first communication channel on at least one digital screen.

[0088] Thus, player Lec1 allows standard content to be broadcast on the screen. Player Lec1 may directly play the first content, e.g., a video, or modify it to play it. For example, player Lec1 may modify the content to fit the screen, e.g., by resizing a video that is too large to be played on the screen, adjusting the brightness of some consecutive videos, etc.

[0089] The player Lec1 may define a playlist for the content to be played. For example, at least one first content received by the first receiver may be gradually incorporated into the playlist, and the first player Lec1 may continuously play tracks from the list. Management of the list playback may be performed in various ways. For example, the first player Lec1 may associate a playback time or a percentage of playback time with each track on the list. The played tracks may also be preferentially broadcast at certain times (such as hours / days) to accommodate people moving around in front of digital display devices.

[0090] Thus, the first receiver and the first player enable broadcasting at least one first content sent by an operator of a digital display device.

[0091] However, the first communication channel may be corrupted. For example, a malicious individual may corrupt the communication channel to broadcast a malicious message. In this case, since the first communication channel is corrupted, it may be impossible for the operator of the display device to re-establish the situation via the first communication channel.

[0092] The first channel also does not allow authorities other than the operator of the display device to display messages on the device. For example, the first communication channel may not allow an emergency management center, such as center Ctr1 shown in Figure 1, to send emergency messages to device Disp3a.

[0093] To overcome these problems, the device Disp3a also - at least one second receiver Rec2 capable of receiving at least one message via a second communication channel; - also comprising a switch Comm configured to deactivate playback of the at least one first content by the first player upon receiving the message via the at least one second receiver.

[0094] That way, upon receipt of a message via the second communication channel, the current display is immediately interrupted without having to utilize the first communication channel.

[0095] The second communication channel may be a communication channel with a platform Plat, which may for example be the platform of the device operator or the platform of a national or regional authority.

[0096] For example, the platform Plat may be an operator's platform configured to send a stop message to a second receiver via a second communication channel upon detecting damage to the display device.

[0097] This allows, for example, a display device operator to send a stop message to a display device upon detection of corruption of the display device, and thus to stop broadcasting of malicious messages without delay. Furthermore, because the second communication channel is separate from the first communication channel, corruption of the first communication channel does not affect the possibility of receiving a stop message via the second communication channel. Thus, broadcasting of malicious messages can be stopped upon detection.

[0098] As shown with respect to FIG. 2, detection of malicious message broadcasts can be done in a variety of ways, as follows: The digital display device may be configured to send a broadcast report to the operator's infrastructure via a first communication channel or a second communication channel, and if an absence of a report or a report that differs from an expected report is detected, a stop message may be sent to the display device via the second channel. The broadcast of malicious or inappropriate content can be detected by a user passing in front of the display device, who alerts the operator of the display device about it. - others.

[0099] In this way, even if the first communication channel is corrupted and unavailable to the operator of the display device, the broadcast of malicious content is stopped upon detection, thereby making it possible to significantly improve the security of digital display devices.

[0100] The platform Plat may also be an emergency management platform configured to send emergency messages to a second receiver via a second communication channel in case of a catastrophe event.

[0101] In this case, the platform Plat may be, for example, a national or regional platform for sending emergency messages, for example, the platform Plat may involve a platform for sending messages in the event of an attack (terrorism, germ-borne alerts, etc.), an industrial disaster, or a natural disaster (earthquake, flood, etc.).

[0102] Whatever the origin of the message received over the second communication channel, the first player may be configured not only to stop playing the first content but also to read the content associated with the message received over the second communication channel.

[0103] If the message is an emergency message, playing the content associated with the emergency message allows the emergency management platform to widely broadcast the emergency message to all digital display devices of several operators, and thus widely and quickly broadcast the emergency message to people, thereby enabling rapid response to a major disaster event nationwide or regionally.

[0104] If the message is to stop broadcasting malicious content, playing the content associated with the stop message may, for example, broadcast a message indicating that the display device is temporarily unavailable and will be repaired as soon as possible, or any other message related to stopping the broadcast of malicious content.

[0105] Playing back content associated with a message received over the second communication channel may consist simply of displaying the text content of the message.

[0106] The text content of the message can also be converted into video content to be displayed on the screen.

[0107] For example, the text content of the message may 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 may be broadcast accompanied by a text message indicating that a flood is imminent and urging people to evacuate. Such a video may, for example, be automatically generated by the first player or retrieved from a library of videos built into the display device that represent various possible warning messages.

[0108] For example, a digital display device may include a library of videos corresponding to various warning messages, where the videos are associated with tags. For example, the videos may include tags that relate to the message type (e.g., #terrorism, #flood, etc.), but also to other characteristics of the video, such as the location (#city, #mountain, etc.), the season (#winter, #summer, etc.), etc. Thus, the text content of a message may include one or more tags that correspond to the type of video to play, and the video may be selected by the display device based on the associated tags. In that way, the tags enable the selection of the most appropriate video depending on both the content (message type) and the context (broadcast environment).

[0109] By converting the text content of a message into video content to be displayed, it is advantageously possible to benefit from a video rendering that immediately catches the attention of passersby, all while only requiring the transmission of a small-sized message, thereby providing, for example, for broadcasting messages very quickly, avoiding message loss, or sending messages over low-rate networks.

[0110] 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 may be played by the first player, potentially in parallel with the broadcast of the text content from the message.

[0111] In this way, stopping the broadcast of the first content can be instantly replaced by the display on the screen of the second content associated with the message. For example, in the event of a major disaster, the second content may include information or instructions given to people. In this way, informational or instructional messages in the event of a major disaster can be widely broadcast.

[0112] The second communication channel can be of various types.

[0113] For example, the second communication channel may comprise a long-range wireless connection, for example wireless communication using relay antennas according to the Lora standard or by satellite.

[0114] Satellite connections have the advantage, in particular, of being able to widely broadcast emergency or warning messages over a geographic area.

[0115] In the case of a satellite connection, the second receiver may be in local communication with the satellite receiver.

[0116] For example, the display device may be located inside a building (such as an airport, train station, shopping center, etc.) and may have a local connection (e.g., by a local wired network, such as Ethernet, Bluetooth, Wi-Fi, etc.) to a satellite receiver located on the roof of the building or generally within another nearby area where satellite signals may be received. An example of such an implementation is described in more detail with reference to FIG. 4.

[0117] In that way, the display device may receive messages sent by satellite even if it is located inside, or more generally, in an area where satellite messages cannot be received.

[0118] This allows the display device to benefit from a satellite connection even when the display device itself is located in a location that prevents it from receiving satellite signals.

[0119] The second communication channel may also comprise a low-rate wireless connection, such as an SMS or Lora connection, which serves to send simple messages very reliably over long distances, all while benefiting from existing infrastructure and allowing messages to be sent to zones not covered by cellular networks.

[0120] In the example from Fig. 3a, the switch Comm is a software module of the player Lec1, so that stopping the broadcast of the first content and the optional broadcast of the second content received via the second communication channel is done directly in the first player Lec1, which allows for a simple and flexible architecture.

[0121] The device Disp3a, the infrastructure Infra, and the platform Plat form a management system Sys3a for the display device Disp3a.

[0122] Now refer to Figure 3b.

[0123] FIG. 3b shows a second example of a digital display device according to a set of embodiments of the present invention.

[0124] The device Disp3b, like the device Disp3a, comprises at least one first receiver Rec1, at least one second receiver Rec2, at least one first player Lec1 and one second player Lec2. All embodiments described with reference to the device Disp3a and to Fig. 3a are respectively applicable to the device Disp3b, except for the incorporation of the switch Comm in the first player Lec1.

[0125] In contrast, in device Disp3b, the switch Comm is separate from the first player Lec1.

[0126] This serves to improve the security of the device Disp3b, since then the switch Comm can operate even in case of corruption of the first player Lec1.

[0127] In a set of embodiments of the present invention, the device Disp3b may also comprise a second player capable of playing on a digital screen a message received by the second receiver or a second content associated with the message, in which case the switch is configured not only to deactivate the playing of the first content by the first player but also to activate the playing of the second content by the second player upon receiving the message, thus displaying the second content.

[0128] This further enhances the security of the device, since the second player Lec2 is independent of the first player Lec1 and can therefore operate even in case of corruption of the first player Lec1.

[0129] Furthermore, the second player Lec2 may be particularly suitable for broadcasting outage or emergency messages. For example, all the functions of the player of the second content associated with a message described with reference to FIG. 3a may be implemented in player Lec2, particularly the playback of text content associated with a message, a video associated with a message, or the generation and playback of a video associated with a message.

[0130] As shown in Figure 3b, a switch may be inserted between the first player Lec1, the second player Lec2, and the screen, so that the switch can activate or deactivate one of the two players simply by selecting one of their inputs to be sent to the screen.

[0131] 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, may be implemented differently.

[0132] For example, each of these elements may comprise software modules executed by one or more processing units.

[0133] In particular, the device Disp3b may comprise: At least one first processing unit for implementing the first player Lec1 and the first receiver Rec1. A single first processing unit or multiple first separate processing units may be used to implement the first player Lec1 and the first receiver Rec1. - At least one second processing unit, separate from the at least one first processing unit, for implementing a second receiver Rec2 and a switch Comm. The at least one second processing unit may also implement a second player Lec2 in embodiments of the invention in which a second player Lec2 is present. A single second processing unit, or multiple separate second processing units, may be used to implement the second player Lec2, the second receiver Rec2, and the switch.

[0134] Thus, two processing units, or groups of separate processing units, are used for: - on the one hand, to implement a standard reception and content broadcasting chain comprising a first receiver Rec1 and a first player Lec1; - on the other hand, to implement a chain comprising a switch Comm, a second receiver Rec2 and, in some embodiments, a second player Lec2, for stopping the broadcast of the first content and, if applicable, broadcasting the second content.

[0135] This makes it possible to further improve the security of device 3b, since the chain for stopping the broadcasting of the first content and, when applicable, for broadcasting the second content continues to work even in the case of a complete breakage of the chain for broadcasting the first content.

[0136] In a set of embodiments of the invention, the various elements that make up device Disp3b may be arranged in separate material units, for example separate boards or printed circuits, connected to each other by wired or network connections.

[0137] For example, it would look like this: At least one first receiver Rec1 may be connected to the first player Lec1 by a TCP / IP connection. A first player Lec1 may be connected to the switch Comm by an HDMI connection. At least one second receiver Rec2 may be connected to the second player Lec2 by means of a serial port. A second player Lec2 may be connected to the switch Comm by a serial port and an HDMI® connection. The HDMI® connection allows the second player Lec2 to send content for playback, e.g., video content, to the switch Comm. Meanwhile, the serial port connection allows player Lec2 to send an instruction to the switch Comm to switch the source of the content played on the screen from player Lec1 to player Lec2. The switch Comm can be connected to the screen Ecr by an HDMI connection.

[0138] The device Disp3b, the infrastructure Infra, and the platform Plat form a management system Sys3b for the display device Disp3b.

[0139] Reference is now made to FIG.

[0140] FIG. 4 illustrates an example of receiving satellite signals by an internal digital display device according to one embodiment of the present invention.

[0141] As indicated above, a digital display device located in a zone (e.g., inside) that does not receive satellite signals may, in a set of embodiments of the present invention, receive messages sent by satellite via a satellite receiver with which it has a local connection.

[0142] In the example from Figure 4, four digital display devices Disp41, Disp42, Disp43, Disp44 are located inside a building and cannot receive messages sent by the satellite Sat4, because the signals sent by the satellite are blocked by a partition Clois, which may be, for example, a wall or ceiling of the building.

[0143] The digital display devices Disp41, Disp42, Disp43 and Disp44 may be located, for example, in an airport, a train station or a shopping centre.

[0144] In this example, the building is equipped with an antenna Ant4 connected to a satellite signal receiver RecSat4 located outside the building, for example on the roof, so that the receiver RecSat4 can freely receive signals transmitted by the satellite Sat4.

[0145] The signal is then directed to devices Disp41, Disp42, Disp43, and Disp44, for example, through a repeater Rep4 connected to receiver RecSat4. Repeater Rep4 may comprise, for example, a Wi-Fi router.

[0146] In this way, all of the digital display devices Disp41, Disp42, Disp43, and Disp44 can receive messages by satellite, for example, warning or emergency messages, even if they are located internally and cannot directly receive the signals sent by the satellite.

[0147] Reference is now made to FIG.

[0148] FIG. 5 illustrates an example of local detection of a damaged digital display device, according to one embodiment.

[0149] More precisely, Figure 5 shows a map of a city on which seven digital display devices Disp51, Disp52, Disp53, Disp54, Disp55, Disp56 and Disp57 are shown (in reality, the number of digital display devices managed by an operator is much higher and can amount to tens or hundreds of thousands of digital display devices located at multiple sites, possibly distributed across several countries).

[0150] When local corruption Corr5 of three devices Disp51, Disp52, and Disp53 is detected, a stop message may be selectively sent to the three devices Disp51, Disp52, and Disp53 to stop the broadcast of malicious content on these devices.

[0151] However, this example is provided only as 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 damaged, a stop message may be sent to the digital display devices according to various criteria. For example, a message may be sent to: - all display devices in a given zone, - all devices with given technical characteristics (e.g., version number for which a security flaw has been identified), - others.

[0152] In all cases, messages may be sent to a set of devices simultaneously to simultaneously stop the display of malicious messages by the set of devices for which corruption has been detected.

[0153] This example illustrates the ability of a system for managing the display of digital display devices according to a set of embodiments of the present invention to immediately stop the broadcast of malicious messages across all devices affected by the corruption.

[0154] Reference is now made to FIG.

[0155] FIG. 6 shows a process P6 for the control of a digital display device, such as one of the devices Disp3a and Disp3b shown in FIGS. 3a and 3b.

[0156] The process P6 includes a first step S61 of receiving, by at least one first receiver Rec1 of the device, at least one first content via a first communication channel.

[0157] The process P6 includes a second step S62 of playing at least one first content on at least one digital screen Ecr of the device by a first player Lec1 of the device.

[0158] The process P6 then comprises a third step S63 of receiving, by at least one second receiver Rec2 of the device, at least one message over the second communication channel.

[0159] Finally, the process P6 includes a fourth step S64 of deactivating the reproduction of the at least one first content by the first player by means of a switch Comm of the device upon receiving the at least one message.

[0160] All embodiments described with reference to Figures 3a and 3b are respectively applicable to method P6.

[0161] The present disclosure is not limited to the exemplary devices, systems, processes and computer programs described above by way of example only, but encompasses all modifications that may occur to those skilled in the art within the scope of protection sought.

Claims

1. A digital display device (Disp3a, Disp3b), - at least one digital screen (Ecr) and - 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), distinct from said at least one first receiver, capable of receiving at least one message via a second communication channel, distinct 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 via said first communication channel; a switch (Comm) configured to deactivate playback of the at least one first content by the first player upon receiving a message via the at least one second receiver; and A digital display device comprising:

2. The device (Disp3b) of claim 1, further comprising a second player (Lec2) capable of playing on the digital screen a message received by the at least one second receiver or second content associated with the message received by the second receiver, and the switch is configured to activate the playback by the second player upon receiving the message.

3. - at least one first processing unit for implementing said first player and said first receiver; at least one second processing unit, separate from the at least one first processing unit, for implementing the second receiver and the switch; and 3. The device of claim 1 or 2, comprising:

4. 4. A device (Disp3a) according to any one of claims 1 to 3, wherein said switch is a software module embedded in said first player.

5. 5. The device of claim 1, wherein the first player or the second player is configured to play second content associated with the message.

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

7. - the second receiver is configured to receive the second content associated with the message; The device of claim 5, wherein the first player or the second player is configured to play the second content on a screen.

8. 8. The device of claim 1, wherein the first communication channel is a high-speed connection with an infrastructure (Infra) of a display device operator, and the at least one first content comprises video content.

9. 9. The device of claim 1, wherein the second communication channel comprises a long-range wireless connection.

10. 10. The device of claim 1, wherein the second receiver is in local communication with a satellite receiver.

11. 11. The device of claim 1, wherein the second communication channel comprises a low-rate wireless connection.

12. 12. The device of claim 1, wherein the second communication channel is a communication channel with an emergency management platform (Plat) configured to send an emergency message to the second receiver via the second communication channel in case of a catastrophe event.

13. 10. The device of claim 1, wherein the second communication channel is a communication channel with a platform (Plat) configured to send a stop message to the second receiver via the second communication channel upon detecting damage to the display device.

14. A management system (Sys3a, Sys3b) for a display device, a display device according to any one of claims 1 to 13; - an infrastructure (Infra) of an operator of the display device, which communicates with the display device via the first communication channel; a platform (Plat) communicating with the display device via the second communication channel; A management system (Sys3a, Sys3b) for a display device, comprising:

15. A process (P6) for controlling digital display devices (Disp3a, Disp3b), - receiving (S61) at least one first content via a first communication channel by at least one first receiver (Rec1) of the device; - playing (S62) said at least one first content on at least one digital screen (Ecr) of said device by a first player (Lec1) of said device; - receiving (S63) at least one message by at least one second receiver (Rec2) of said device, separate from said at least one first receiver, via a second communication channel, separate from said first communication channel; - upon receiving the at least one message, deactivating (S64) the reproduction of the at least one first content by the first player by a switch (Comm) of the device; Including,process (P6).

16. 16. A computer program comprising instructions for carrying out the process of claim 15 when said program is executed by a processor.

17. 16. A non-volatile computer readable storage medium having stored thereon a program for use by the process of claim 15 when the program is executed by a processor.

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