FR3075429B1 - NOMADIC AND FLEXIBLE SCREEN - Google Patents

Abstract

A device (1) having a display face (3) and comprising: - a display layer (7) visible from the display face. a tactile detection layer (11) superimposed on the display layer. at least one wireless communication module, a set of photovoltaic sensors (13), a battery, and a control unit arranged to control the display layer according to data drawn from the detection layer. touch and / or data received via the at least one communication module. The display layer having an active area greater than 300 square centimeters. The device has a mass less than 65 grams per 100 square centimeters of active area, has a thickness of less than 10 millimeters and is arranged to have a flexibility such that a radius of curvature of less than 20 centimeters can be achieved.

Description

Nomadic and flexible screen

The invention relates to the field of multifunction electronic devices.

Conventionally, information in places receiving the public is given through inert media, such as paper, and is rarely updated. The reliability of information decreases over time. Since paper is considered an abundant resource, a new medium is used for each new information without systematically deleting the previous information. This results in an overabundance of information and a dilution of the relevance of all the information.

Dynamic screens, such as televisions, make it easier and more regular to display updated information. New information generally replaces obsolete information. Such screens consume energy continuously and regardless of their audience. Although easily updated, the information disseminated is pre-established, and independent of the individuals likely to consult it and the environment in which it is located. Their relevance is therefore limited.

Some of the screens in public places are interactive and can display information selected according to user requests, for example via a touch screen interface. Such screens are, for example, installed in public transport or museums. Users cannot move or take away such screens. The operation of such screens is extremely limited.

These screens require a dedicated infrastructure to operate and a permanent power supply and network. They have a significant energy cost and, in the event of failure of the electrical supply or the network infrastructures, the screens become useless.

The invention improves the situation.

A device is proposed having a display face and comprising:

- a display layer visible from the display face,

- a touch detection layer at least partially superimposed on the display layer,

- at least one wireless communication module,

- a set of photovoltaic sensors,

- a battery capable of being charged by the photovoltaic sensors, and

- a control unit arranged so as to control the display layer as a function of data drawn from the touch detection layer and / or of data received via the at least one communication module.

The display layer has an active area greater than 300 square centimeters. The device has a mass of less than 65 grams per 100 square centimeters of active surface of the display layer, has a thickness of less than 10 millimeters and is arranged so as to have flexibility such that a radius of curvature is less than 20 centimeters can be reached.

Such a device makes it possible to adapt its use at will and according to the situations. The information displayed on several devices can be updated centrally and / or separately for each device while the energy consumption is negligible compared to that of a television. The installation of such devices does not require any wired network, power supply, or data. Such devices can be easily installed, reversibly, on numerous supports, including curved surfaces and / or without specific support means, and optionally outdoors. The nature of the information displayed can be adapted according to the situations, for example to guide people in a building. The display remains functional in the event of a power cut and / or mains supply in the building. Users can temporarily take ownership of one or more of the devices, move them, use them as a writing surface and / or interface with a remote server and other devices. The device then becomes a collaborative communication medium. It can automatically, in the event of an alert, become a device to assist in the evacuation of personnel and assistance to responders reinvesting in the premises after the evacuation.

The following features can optionally be implemented. They can be implemented independently of each other or in combination with each other:

- The device further comprises a support arranged so as to form a sealing envelope for the device with respect to the external environment. This allows the device to be used in humid environments, especially outdoors and / or in industrial areas usually lacking IT infrastructure.

- The control unit is arranged to authorize or prohibit functionalities of the device as a function of a detection, and of an identification implemented by means of at least one of the wireless communication modules. This makes it possible to automate the adaptation of the functionalities of the device according to the users, in particular in the context of securing access to data and also according to the information reported by possible ambient sensors.

- The device does not have an external connector. This limits the risk of device malfunction due to device leaks.

- The control unit is arranged for:

- switch from a display mode of preset information to a display mode of data entered in real time as soon as an interaction with the touch detection layer is detected, and / or

- switch from a display mode of data entered in real time to a display mode of pre-established information when an absence of interaction with the touch detection layer exceeds a threshold duration, and / or

- switch to a security information display mode regardless of the current mode with detection of a preset sound frequency so as to correspond to a security alert.

This makes it possible to automatically adapt the functionality of the device according to the real and immediate use of the user and / or pre-established security parameters. A single device can thus replace several usually separate devices.

- The photovoltaic sensors are distributed on the display face and in the vicinity of the display layer. This allows the battery to be charged substantially continuously in most usage situations, especially when the device is placed against a vertical surface or flat on a horizontal surface. Thus, recharging and use can be concomitant.

- The control unit is arranged to communicate with analogous and adjacent devices via a communication module so that at least two analogous and juxtaposed devices form an extended display. This allows the devices to cooperate with each other and improves the adaptability of the devices to the environment and to uses.

- The device has a support face, opposite the display face, coated with an adhesive layer and / or equipped with a magnetic strip. This allows temporary attachment to a surface and easy separation of the surface at will.

- The device also includes a user authentication device. The control unit is further arranged so as to filter the accessibility of the data by means of the device according to said authentication device. This improves the security of access to data via the device, for example by authentication devices of biometric type.

Other characteristics, details and advantages of the invention will appear on reading the detailed description below, and on analysis of the appended drawings, in which:

- Figure 1 shows a front view of a device according to the invention;

- Figure 2 shows a back view of the device of Figure 1;

- Figure 3 shows a schematic representation of the interior of a device according to the invention;

- Figure 4 shows a schematic representation of the internal part and the control module, also called a controller, of a device according to the invention; and

- Figure 5 shows the integration of a set of devices in a global infrastructure according to the invention.

The drawings and the description below essentially contain elements of a certain nature. They can therefore not only serve to better understand the present invention, but also contribute to its definition, if necessary.

Figures 1 and 2 show an embodiment of a device 1. The device 1 has a general form of plate, here of substantially rectangular shape. The device 1 has two main faces opposite one another. A first of the main faces forms a display face 3, or front face, visible in FIG. 1. The second of the main faces forms a support face 5, or back, visible in FIG. 2.

The device 1 comprises a display layer 7. The display layer 7 here comprises a layer of electronic paper. The layer of electronic paper can also be called the layer of "electronic ink", or "e-paper". As a variant, the display layer comprises a display layer of the OLED (for “Organic Light-Emitting Diode”, or “organic light-emitting diode”), PLED (for “Polymer Light-Emitting Diode”, or “light-emitting diode”) type. to polymer ”), or even PHOLED (for“ Phosphorescent Organic Light-Emitting Diode ”, or“ phosphorescent organic light-emitting diode ”). The display layer 7 has no backlight. The power consumption of display layer 7 is low. In the case of electronic paper, consumption is zero excluding refreshment and less than 3.7 Watts when refreshed. In the case of OLED technologies, consumption is about 60% lower than that of LED technologies ("Light-Emitting Diode", or LED for "Light Emitting Diode").

The information displayed by means of the display layer 7 remains visible from the display face 3. The display layer 7 makes it possible to display information and to modify said information displayed by electronic control, for example via of the touch layer as will be described below. In the absence of an electronic control, the display layer 7 is passive (residual) but preserves its display function: the information remains displayed durably until receipt of a new electronic control.

The display layer 7, without backlight, has better eye tolerance for users compared to backlit screens. The harmful effects of type "blue light" and "strobe" are absent.

In the example described here, the display layer 7 comprising electronic paper, no energy is required to maintain a non-volatile display.

The display layer 7 here designates the pixel matrix defining the active surface of the display. Each pixel comprises a cell, including an optically active part. The optically active part is produced in the form of liquid polymer or liquid crystal in the case of electronic paper, or in the form of a superposition of organic materials for OLED / PLED / PHOLED technologies. The two technologies stand out in particular in that the OLED / PLED / PHOLED cells form a primary source of light (electroluminescence), making third-party lighting unnecessary, while electronic paper has no primary light source and requires a third-party primary source. to view the content displayed by the device 1. Each cell further includes a control part in the form of a pair of electrodes arranged on either side of the optically active part. By electronically controlling the potential between the two electrodes of each cell, it is possible to control the optical appearance of each pixel separately. Thus, the display layer 7 is itself composed of a superposition of at least three layers: a layer of electrodes on the side of the display face 3 with high transparency in visible light, an optically active layer , and an electrode layer on the side of the support face 5. The display layer 7 does not include, here, the electronic control elements of the electrodes which will be described below.

The display layer 7 has a thickness of less than 0.5 millimeter. The display layer 7 has great flexibility, making it possible to achieve a radius of curvature less than 10 centimeters in a reversible manner and without visible damage. Thus, the display layer 7 can be at least partially rollable on itself. The display layer 7 has a mass of less than 0.2 grams per square centimeter of active surface. By "active surface" is meant here the surface including pixels whose state is controllable. Any border areas of the display layer 7 devoid of a controllable pixel do not belong to the active surface. The display layer 7 has an area between 5 square centimeters and 1 square meter. For example, the shape of the display layer 7 corresponds to the formats A0, Al, A2, A3, A4 or A5 defined by the ISO 216 standard.

The device 1 comprises a touch detection layer 11 at least partially superimposed on the display layer 7 on the display face 3 of the device 1. The touch detection layer 11 forms an input interface of the device 1 for a user. The touch detection layer 11 is here functionally distinguished from the display layer 7. However, the display layer 7 and the touch detection layer 11 can share common components. For example, a physical layer or a superposition of physical layers can be considered to belong both to the display layer 7 and to the tactile detection layer 11. The term tactile is used here in the usual generic sense of the field and n '' does not necessarily imply direct contact: for example detection technologies by inductive phenomenon at a short distance can, here correspond to the tactile detection layer

11.

The tactile detection layer 11 has a thickness of less than 0.1 millimeter. The touch detection layer 11 has a shape and dimensions similar to those of the display layer 7. The touch detection layer 11 has the same flexibility in a reversible and harmless manner as the display layer 7. The tactile detection 11 is at least partly rollable up on itself.

The display layer 7 and the touch detection layer 11 have here similar characteristics and are substantially superimposed on each other. Alternatively, they can be different from each other. For example, at least one may have even greater flexibility and / or the active surfaces may be different from each other. The two layers 7, 11 can only partially overlap. Thus, an area can be "tactile" without a display being possible, for example to form a permanent virtual button.

The device 1 comprises a support 9. The support 9 has, here, a flexibility such that a radius of curvature less than 20 centimeters can be reached in a reversible manner and without damage. In the example described here, the flexibility properties of the display layer 7 and of the tactile detection layer 11 are at least equivalent to those of the support 9. The support 9 has a structure and a composition selected so that, assembled with the display layer 7 and the tactile detection layer 11, the active surface of the display layer 7 remains visible from the display face 3.

In the example described here, the support 9 takes the form of an envelope in which is inserted the assembly of the display layer 7 and the tactile detection layer 11. The support 9 comprises a front layer covering the layers display 7 and tactile detection 11, on the side of the display face 3, and a rear layer. The rear layer covers the other components of the device 1 on the side of the support face 5. The rear layer may itself be self-adhesive or at least partially covered with a self-adhesive layer. The front and back layers are liquid tight. The front layer, at least, has a high transparency to visible light so that the display layer 7 remains visible from the display face 3. In addition, the front face is arranged so that the detection layer Touch 11 remains operational.

The support 9 has external dimensions greater than those of the assembly of the display layer 7 and the tactile detection layer 11. In FIG. 1, the external rectangle represents the outline of the support 9 while the internal rectangle represents the contour of the display layer 7. The front and rear layers of the support 9 are assembled to one another along a contour zone, for example sealed to one another.

The support 9 is arranged so as to protect the other organs of the device 1 from the external environment. For example, the support 9 forms a tight barrier protecting the interior of the device 1 from humidity. In variants, the support 9 can be arranged so as to form only partial protection of certain organs, or even be absent from the device 1. In variants, the support 9 takes the form of a monolayer rather than an envelope and is applied only on the side of the support face 5. Such variants of the support 9 are sufficient, for example when the display layer 7 itself has properties of resistance to the external environment sufficient.

The device 1 comprises a set of photovoltaic sensors s 13. The photovoltaic sensors 13 are distributed over the contour of the device 1 and oriented on the side of the display face 3. The photovoltaic sensors s 13 are adjacent to the layer of display 7, so as to leave visible the active surface of the display layer 7. In the example described here, the device 1 comprises six photovoltaic sensors 13 distributed along the two long and opposite edges of the device 1. The number of sensors can be different, for example adapted according to energy consumption.

The device 1 comprises an internal part 100, inside the support 9. The devices of the device 1 accessible from the outside are connected to the internal part 100, for example the display layer 7, the touch detection layer 11 , the photovoltaic sensors 13. The internal part 100 can take the form of an electronic card receiving a set of components controlled by a control unit 130 or controller.

The device 1 comprises at least one module 110, 111, 112 for wireless communication. In the example described here, the device 1 comprises:

- a near field communication module 110 (or NFC for "Near Field Communication"), that is to say a range generally less than 10 centimeters,

a very short-range communication module 111, that is to say a range generally less than 20 meters, for example of the Bluetooth type,

- a short-range communication module 112, that is to say a range generally less than 100 meters, for example of the Wifi type.

As a variant, a communication module compatible with a LoRa type network is provided. Such communication, operating by relay, makes it possible to reach long distances.

In the example described here, the device 1 comprises a microphone 120. The device 1 comprises a loudspeaker 121. The device 1 comprises an external connector 150, for example of the micro-USB type. In embodiments, the equipment of the device 1 is arranged so as to preserve the liquid-tightness of the device 1. For example, the external connectors are fitted with shutters. In variants, the device does not have an external connector. In these cases, the data exchanges between the device and its environment can be ensured by means of at least one of the communication modules 110, 111, 112 and / or by means of an additional wireless communication module.

The device 1 comprises at least one internal battery 101 capable of being charged by the photovoltaic sensors s 13.

The device 1 comprises the control unit 130, also called a controller. The equipment of the device 1, for example the microphone 120, the speaker 121 and the connector 150, are connected to the control unit 130. The control unit 130 is in particular arranged so as to control the display layer 7 as a function of data drawn from the tactile detection layer 11 and / or of data received via a communication module 110, 111, 112. The internal part 100 comprises at least one processor, here belonging to the control unit 130, for example in the form of a system on a chip or “SoC” for “System on a Chip” and a data storage member 141 connected to the processor.

In the example described here, the device 1 comprises an energy management module 8 arranged so as to control the charge of the battery 101 by the photovoltaic sensors 13 and to supply power to the display layer 7, the layer of tactile detection 11, and the modules 130, 110, 111, 112, 121.

The photovoltaic sensors s 13 and the energy management module 8 allow the device 1 to continue to operate independently of the availability of an external energy source. Thus, the device 1 can be provided to be supplied by an external source in normal operation, for example via the connector 150, and to operate on battery in the event of the unavailability of the external energy source. The device 1 can also be designed to operate only by means of the energy supplied by the photovoltaic sensors 13, without an external energy source, in any situation.

The support face 5 is equipped with a fixing member. In the example described here, the support face 5 is coated, at least partially, with an adhesive layer 15, for example a multi-surface adhesion layer according to the technology known under the name "Geckskin".

The device 1 as a whole has a thickness of less than 10 millimeters, for example between 7 and 10 millimeters. The device 1 as a whole has a mass less than 65 grams per 100 square centimeters for an A4 format. The basis weight can be reduced for devices with formats larger than A4. The device 1 as a whole is arranged so as to have a flexibility such that a radius of curvature less than 20 centimeters can be reached. Flexibility here means the possibility of reaching a curvature of the device 1 without irreversible damage and preventing the device 1 from operating. In particular, the organs used in the composition of the device 1 and described below are mutually distributed so that the flexibility of the device 1 is preserved.

The combination of the fixing member and the flexibility of the device 1 allows fixing on a non-planar surface, for example a curved surface such as the contour of a pillar. The adhesive layer 15 allows reversible fixing to a surface devoid of fixing element, for example a substantially smooth surface such as painted, wooden, metallic or even glass surfaces. As a variant, the device comprises other types of fastening members, for example hooks adapted to complementary parts provided on walls.

The device 1 comprises a magnetic strip 19. The magnetic strip 19 allows a removable fixing of the device 1 on metal surfaces. In the example described here, the magnetic strip 19 extends substantially along the contour of the device 1 on the side of the support face 5.

In Figure 3, the interior of the device 1 is shown in internal view from the support face 5, the latter not being shown. A connector between the internal part 100 and the display layer 7 is referenced 17. The control unit 130 is connected to each of the electronic equipment of the device 1.

FIG. 4 represents different components controlled by the control unit 130 (or controller or SoC).

The control unit 130 controls and manages all the electronic components of the internal part 100 and executes the software functions of the device 1. In the example described here, the internal part comprises:

the control unit 130 in the form of a system embedded on a chip (SoC) including one or more microprocessors and interface peripherals. All the electronic components of the device 1 are connected to it, in particular the display layer 7;

an operating system 140 for managing all of the applications and interfaces, associated with a working memory RAM 142 and a flash memory 141 for long-term storage;

a charging circuit 102 forming the interface between the internal battery 101 and the energy management module 8, the module 8 being itself connected to the photovoltaic sensors s 13. In the event of insufficient light, the module 8 energy management can be wired via the micro-USB port 150, for example by connection to the mains or on an external battery;

- the communication modules 110, 111, 112 allowing the device 1 to adapt to various environments. For example, certain categories of electromagnetic waves may be prohibited in particular environments. The plurality of communication modules makes it possible to adapt the communication means implemented by the device 1 at will. Communication by wired connection, for example of the Ethernet type, is provided. The micro USB 150 port can be made compatible by adding a micro USB 150 adapter;

- connections to the microphone 120 and to the speaker 121;

- Orientation sensors 160, connected to the SoC, allowing the automatic detection of the orientation of the device 1 in order to adapt the display by the display layer 7 ("portrait" or "landscape" format); and

- an accelerometer 161, connected to the SoC, allowing the automatic detection of a movement of the device 1, for example in the context of anti-theft surveillance.

In variants, the device further comprises at least one presence sensor. Such a sensor can be used to detect the presence or absence of a person near the device. Thus, the display can be neutralized or else the refresh of the display by activating the display layer 7 can be neutralized in the absence of at least one person detected and / or according to other parameters pre-established.

Ue device 1 is arranged to be compatible with environments different from each other. For example, the device 1 can be implemented in a domestic environment, in professional environments such as offices, or even on industrial sites.

FIG. 4 represents several devices 1 and their interactions with an existing infrastructure. Display data are received by each device 1 via at least one of the communication modules 110, 111, 112. The display data are for example from at least one central server 201 and transmitted by Wifi in a building, if necessary by means of relay 203, or WiFi terminals. In a display and / or monitoring operating mode, at least one central server 201 then forms a master equipment while each device 1 forms a slave equipment. In a surveillance operating mode, each device 1 is arranged to report field data to one of the central servers 201, for example information taken from the sensors integrated into the device 1 itself (microphone 120, orientation sensor 160, accelerometer 161, presence sensor, etc.). Brightness data can also be obtained through photovoltaic sensors 13.

The field data can also come from sensors 205 distinct from the devices 1. In this case, the devices 1 receive the data from sensors arranged nearby, for example by Bluetooth, NFC or via the connector 150. Said data can be processed to adapt the content displayed via the display layer 7 and / or be transmitted to one of the central servers 201 by Wifi, Bluetooth or wired network. Thus, the devices 1 distributed over a site can form local access points to an existing network. Thus data from sensors such as presence, brightness, temperature, or even sound sensors can be used to improve personal safety. For example, the control unit 130 can be arranged to detect among the data drawn from a sound sensor (microphone) the frequencies characteristic of a fire alarm. In the event of such detection, the control unit 130 can be arranged to control the display layer 7 so that it displays security information adapted to the situation.

In a display operating mode, each device 1 is arranged to display information according to a scenario imposed by the server 201 (“loop” fixed or mobile images; similar or specific to each device 1).

In a combined mode, the devices can be arranged to communicate with each other, for example by Bluetooth. Thus, several juxtaposed devices 1 can be used for a large display, greater than the active surface of a single device 1.

In an interactive mode, data entered on a first device 1, for example via the touch detection layer 11 associated with the display surface 7, can be displayed on a second device 1 distinct from the first, for example via the d layer. 'display 7 (extended on several devices or duplicated on each device). The data can be transmitted directly from the first to the second device 1 when the distance between them allows direct communication. When the distance is significant, the transmission can be indirect, that is to say a transmission via a central server 201. Such devices left available in workspaces can thus be used commonly by several users during a meeting, then each user can take over at least temporarily one of the devices 1 on which the common information is duplicated.

Each device 1 is arranged to switch from one mode to the other at will and / or to combine several modes. Mode locks can be provided: a device configured to indicate an emergency exit can, for example, prevent passage into interactive mode.

The devices 1 being arranged to be easily moved and repositioned at will on new surfaces, users are encouraged to move them between common areas, such as meeting rooms, and areas for personal use, such as an office. The risks that sensitive information is forgotten and left accessible in public areas are controlled, in particular by comparison with the use of fixed tables or "Paper boards". For example, the control unit 130 can be arranged to automatically disappear the content displayed by the display layer 7 detecting the remoteness of the users, which corresponds, for example to a situation in which the participants a meeting leave a room without taking the device. The data can nevertheless be stored securely, for example on a remote storage space. The control unit 130 can also be arranged to display again via the display layer 7 the stored data on detection by the same set of users.

The devices 1 being arranged to be regularly connected to a central server 201 via a network, the software components of each device 1 can easily be updated centrally.

In order to illustrate the operation of the devices, the applicant offers a few examples of non-limiting domestic and professional applications:

- A single device, or a composition of several devices arranged in a room, can be used as a decorative object, like a decorative frame. Energy autonomy eliminates the need for a mains connection or maintenance by changing the battery. By remote control, for example via a wireless home network, the content displayed can be changed at will and the decoration easily adapted.

The device can be used as a note taking support ("portable whiteboard" mode) with sensations close to those imparted by paper and in the absence of connectivity to a network, for example in public transport. The device can also serve as an easily transportable working support for several users, for example as a meeting support in a train. Then, the content can be transmitted to other terminals as soon as a connection to a network is available, for example to a smartphone, or "smartphone", tablet or computer.

The device can be installed in a shared place, accessible to several people, either to write messages directly to a future user of the place, or to send messages in real time and remotely to display on the device left in the shared place. Such a device can for example be left permanently at the home of a family to facilitate communication between the members of a family present at the home at different times of the day.

Such a device can advantageously replace mobile terminals of smartphone or tablet type without it being necessary to recharge it to facilitate communications. Such a device can, for example, provide assistance to people with motor and / or visual impairments and for whom the handling of existing terminals is difficult.

Such a device can be used in a professional context to facilitate collaboration between several people, while being easily adaptable to numerous configurations of premises. For example, the deployment of such devices in premises does not require the installation of dedicated cable networks. The devices can be used substantially continuously between a group work session and an individual work session. Such long-lasting, energy-independent and low-calorie devices can advantageously replace several types of existing devices with a reasonable ecological footprint. The Applicant has estimated the maximum consumption in use to be less than 5 watts.

Such devices can advantageously replace fixed and temporary displays by becoming adaptable at will, depending on the users and the situations. Planar, concave and convex surfaces can be used to place a device there. They can also replace the erasable or paper-based boards usually used during professional meetings while allowing the transfer of data from one device to another and storage via a remote server ("cloud" recording).

Depending on the intended uses, access to information via the devices may be subject to prior identification of the user. For example, the NFC 110 and / or Bluetooth 111 module can be used to detect an identification badge 207. Services adapted according to the identification may be provided.

The display content of all devices in an area can be controlled remotely, at least temporarily. For example, in the event of an alert, safety information can be displayed on all devices regardless of their current use and the availability of an external power source. In an emergency, the display mode can be given priority over the other modes. Other priority rules can be set. Thus, the devices can act as a guide for the evacuation of a building, even in the event of a power cut, and regardless of the current use of the devices. The analysis of the context data transmitted to the device 1 via nearby sensors can locally allow the maintenance of the basal level of security of the environment and, depending on the context, go back to the central server 201 of the indicators necessary for the general supervision of the premises.

In the event of an alert, including in the event of loss of electrical supply and / or network, the devices can automatically become evacuation aids taking into account the context and indicate, for example, the zones of withdrawal, evacuation , or deliver the appropriate safety messages. The devices can be used by post-evacuation workers, such as rescue teams or technical workers, by providing information on the state of the installation to facilitate the analysis of the situation and the risks. The devices can also be used as a means of display for responders, for example by taking control of them through communication modules.

In an industrial context, data can be transmitted substantially in real time in areas that are difficult to access and in which the use of computer terminals is complex. The devices being light, flexible and optionally waterproof, an operator can, for example, place the device on supports not provided for this purpose, within sight while keeping his hands free.

The autonomy to weight ratio of the devices is significantly higher than that of conventional tablets. Even in case of exhaustion of the internal battery and insufficient brightness to recharge it, the display is no longer modifiable but remains effective (image frozen but visible).

The device can also be used in areas where there is no power supply, in particular outdoors. For example, such devices can be arranged in mounting, on hiking trails or ski slopes, to deliver real-time safety messages, optionally adapted as a function of data from ambient sensors.

The embodiments with waterproof support can withstand outdoor weathering, and the projection of water or foam, for example in the event of indoor fire fighting systems.

The flexibility of the devices makes it possible to advantageously replace inert displays on non-planar supports, for example on pillars or supports such as "Morris columns".

In variants, the device further comprises a user authentication device. For example, a fingerprint reader may be provided. Alternatively, one of the communication modules can be arranged to allow the identification of a contactless identification device such as a known NEC badge. The control unit 130 can be arranged so as to filter the accessibility of the data by means of the device 1 as a function of said authentication device and in particular of the authentication results. For example, the data passing through the device 1 can be automatically encrypted, decryption being allowed only according to the results of the authentications.

The invention is not limited to the examples of devices described above, only by way of example, but it encompasses all the variants that a person skilled in the art may envisage within the framework of the protection sought.

Claims (9)

claims 1. Device (1) having a display face (3) and comprising: - a display layer (7) visible from the display face, - a touch detection layer (11) at least partially superimposed on the display layer, - at least one wireless communication module (110, 111, 112), - a set of photovoltaic sensors (13), a battery (101) capable of being charged by the photovoltaic sensors, and a control unit (130) arranged so as to control the display layer as a function of data drawn from the touch detection layer and / or of data received via the at least one communication module, the display layer having an active surface greater than 300 square centimeters, the device having a mass less than 65 grams per 100 square centimeters of active surface of the display layer, having a thickness less than 10 millimeters and being arranged so as to have a flexibility such that a radius of curvature less than 20 centimeters can be achieved. 2. Device (1) according to claim 1, further comprising a support (9) arranged so as to form a sealing envelope of the device with respect to the external environment. 3. Device (1) according to one of the preceding claims, in which the control unit is arranged to authorize or prohibit functionalities of the device according to a detection, and an identification implemented by means of the at least one of the wireless communication modules (110, 111, 112). 4. Device (1) according to one of the preceding claims, without an external connector. 5. Device (1) according to one of the preceding claims, in which the control unit is arranged for: - switch from a display mode of preset information to a display mode of data entered in real time as soon as an interaction with the touch detection layer is detected, and / or - switch from a display mode of data entered in real time to a display mode of pre-established information when an absence of interaction with the touch detection layer exceeds a threshold duration, and / or - switch to a security information display mode regardless of the current mode with detection of a preset sound frequency so as to correspond to a security alert. 6. Device (1) according to one of the preceding claims, in which the photovoltaic sensors (13) are distributed on the display face and in the vicinity of the display layer. 7. Device (1) according to one of the preceding claims, in which the control unit is arranged to communicate with analogous and adjacent devices via a communication module so that at least two analogous devices and juxtaposed form an extended display. 8. Device (1) according to one of the preceding claims, having a support face (5), opposite the display face (3), coated with an adhesive layer (15) and / or equipped with a magnetic strip (19). 9. Device (1) according to one of the preceding claims, further comprising a user authentication device, the control unit (130) being further arranged so as to filter the accessibility of the data via of the device according to said authentication device.