DISPLAY DEVICE

Description

TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates generally to the field of information display devices, in particular within vehicles (in particular motor vehicles).

[0002] It relates more particularly to a haptic feedback display device for a vehicle dashboard. TECHNOLOGICAL BACKGROUND

[0003] Display devices using screens are increasingly present in vehicles, particularly motor vehicles. Integrated into the dashboard, the screens can be used to display information relating to the vehicle's operation or a route taken, for example, air conditioning, radio, or GPS. In addition, these screens often have a touch function and can then be used by a user as an interface to interact with the vehicle, which eliminates the need for push buttons.

[0004] We are seeing an increase in the range of these touch screens with the addition of additional features such as haptic feedback following a press on the screen.

[0005] To be properly perceived by the user, haptic feedback must satisfy certain constraints such as minimum displacement and / or minimum acceleration of the surface in contact with the user's finger. Conventionally, efficient vibration is achieved by using multiple mechanical actuators or large mechanical actuators.

[0006] However, the volume available for integrating these screens into the dashboard is often limited.

[0007] EP 3 637 233 A1 discloses a display apparatus. PRESENTATION OF THE INVENTION

[0008] In this context, the invention proposes a display device comprising a front glass; a backlighting device, designed to generate a source light beam; a modulator, integral with said front glass and located between said front glass and said backlighting device so as to receive said source light beam and to transmit a modulated light beam through said front glass; and at least one mechanical actuator comprising a first part and a second part movable relative to each other, the first part being in contact with the backlighting device and the second part being linked to the front glass; said mechanical actuator being arranged so as to be able to move said front glass relative to said backlighting device.

[0009] Thus, thanks to the invention, the mechanical actuator(s) can move only part of the display device, comprising the front glass and the modulator, relative to the backlighting device. It is therefore possible not to move the entire display device to provide haptic feedback but only part of it.

[0010] Therefore, the mass to be vibrated, i.e. to be moved, is much smaller than the total mass of the display device. Since the mass to be moved is small, small or fewer actuators can be provided, while still satisfying the constraints of acceleration and minimum displacement of the surface of the display device that is in contact with the user's finger.

[0011] In fact, it is possible to integrate such a display device as a touch screen with haptic feedback into small spaces.

[0012] Other non-limiting and advantageous characteristics of the display device according to the invention, taken individually or in all technically possible combinations, are as follows: said mechanical actuator is a piezoelectric actuator; a first connecting element fixed by a first part to said mechanical actuator and fixed by a second part to said front glass; said first connecting element has a profile forming two right-angled arms, said mechanical actuator being fixed to a first arm and said front glass being fixed to a second arm; said modulator is bonded to said front glass by an optical adhesive; the display device further comprises: at least one second connecting element fixed to said front glass; and at least one spring, in contact by a first end with said backlighting device and by a second end with said second connecting element, so as to pre-stress said mechanical actuator and / or to return said front glass to an equilibrium position; said second connecting element has a right-angled profile;a protective element is arranged at the periphery of said backlighting device, between said backlighting device and said front glass; said backlighting device comprises a magnesium casing; a Teflon surface is located between said mechanical actuator and said backlighting device; said display device comprises a flexible element designed to connect said front glass to a structure and to allow movement of said front glass relative to said structure; said flexible element is made of a material belonging to the group consisting of: silicone; said flexible element is arranged so as to remain in an elastic deformation regime when said front glass undergoes an acceleration of at least 6 G and a displacement of at least 100 micrometers relative to said structure;at least one sensor is arranged between said facade glass and said structure, and is designed to measure a force exerted on said facade glass.; DESCRIPTION OF EMBODIMENTS

[0013] The description which follows with reference to the appended drawings, given as non-limiting examples, will make it clear what the invention consists of and how it can be implemented.

[0014] Of course, the various features, variants and embodiments of the invention may be combined with each other in various combinations to the extent that they are not incompatible or mutually exclusive.

[0015] On the attached drawings: [ Fig. 1 ] is a schematic sectional view of a display device according to the invention; [ Fig. 2 ] is a schematic view of the display device of the figure 1 assembled with a structure; [ Fig. 3 ] is a schematic top view of a mechanical actuator of the display device of the figure 1 or of the figure 2 ; And [ Fig. 4 ] is a schematic sectional view of a part of a display device according to the invention.

[0016] Of course, various other modifications may be made to the invention within the scope of the appended claims.

[0017] In this document, a display device 1 is described in the case where it is used as a touch screen with haptic feedback within a motor vehicle, for example so that a user can view information relating to the operation of the vehicle and interact with the vehicle. The display device 1 may for example be integrated into a dashboard of the vehicle. In this case, the display device 1 has an outer surface oriented towards the user located in a passenger compartment of the vehicle. The outer surface is further designed to be brought into contact with the user, in practice with the user's finger. The display device 1 may however also be applied to any other conceivable use of a screen with haptic feedback.

[0018] As shown in the figure 1 , the display device 1 comprises: a front glass 10; a backlighting device 20; a modulator 12; and at least one mechanical actuator 30.

[0019] In the described embodiment, the facade glass 10 extends in a plane, called the reference plane. Here, the reference plane is the XZ plane of the figure 1 . Here, the front glass 10 has the overall shape of a flattened parallelepiped, this means in particular that its thickness, here the dimension in the Y direction, is very clearly less than its width and its length, here the two dimensions in the reference plane XZ. The front glass 10 may for example have in the reference plane XZ the dimensions of a 14-inch screen, for example 31 cm in length and 17.4 cm in width and a thickness of a few millimeters, for example from 1 mm to 5 mm. In practice, the shape of the front glass 10 in the reference plane XZ may be adapted to the shape of the dashboard.

[0020] The front glass 10 is a transparent or quasi-transparent glass plate. Indeed, the front glass 10 is adapted to be traversed by a light beam without substantially distorting or attenuating the latter. This light beam, called a modulated light beam, enters through a rear face 13 and exits through a front face 14, opposite the rear face 13, in the direction of the user. The modulated light beam makes it possible to transmit information, for example in the form of images, to the user, for example on the state of the vehicle. Here, the front face 14 corresponds to the outer surface of the display device 1.

[0021] The backlighting device 20 is designed to generate a source light beam towards the front glass 10, more precisely towards the rear face 13 of the front glass 10. As shown in figure 1 , the backlighting device 20 generally has the shape of a parallelepiped whose thickness is less than its width and length.

[0022] Here, the backlighting device 20 generates a polychromatic source light beam so as to form color images for the user. Alternatively, the backlighting device could generate a monochromatic source light beam to form monochromatic images.

[0023] Remarkably, it can be provided that the backlighting device 20 comprises a magnesium protective casing to ensure high rigidity. To generate the source light beam, the backlighting device 20 can for example comprise light-emitting diodes.

[0024] The backlighting device 20 is located opposite the front glass 10 at a short distance from the front glass 10, typically between 0.5 mm and 5 mm. On the figure 1 , the part of the backlighting device 20 which faces the front glass 10 is flat. Alternatively, to be located as close as possible to the front glass 10, this part could have a recess adapted to the shape of the modulator 12.

[0025] As shown in the figure 1 , the modulator 12 is located (i.e. interposed) between the backlighting device 20 and the front glass 10. The modulator 12 has the form of a film which extends in the reference plane XZ. The modulator 12 is fixed to the front glass 10. Here, the modulator 12 is bonded to the front glass 10 by an optical adhesive 11, for example an optical resin, for example silicone. The modulator 12 is separated from the backlighting device 20 by a gap.

[0026] The modulator 12 consists of a matrix of elements whose transmittance varies over time. Each element of the matrix defines a pixel of the display device 1. The modulator 12 receives the source light beam and transmits the modulated light beam towards the front glass 10. Thanks to its matrix of elements, the modulator 12 spatially modulates the source light beam so as to form the modulated light beam.

[0027] Here, the modulator 12 is a TFT (thin film transistor) type liquid crystal screen, that is to say a matrix of liquid crystal cells each controlled by a thin film transistor (hence the name of the screen called TFT). For each pixel, three cells, each associated with a color filter, for example one for blue, one for green and one for red, make it possible to control the transmittance, by orienting the liquid crystals, in a stable manner and with a low response time.

[0028] Alternatively, the source light beam could be produced by micro-LEDs or organic light-emitting diodes.

[0029] The display device 1 described here comprises a single mechanical actuator 30. Of course, the display device 1 may comprise several mechanical actuators 30 which can be oriented in distinct directions. However, the display device 1 makes it possible to achieve effective haptic feedback with only one mechanical actuator 30, even a small one.

[0030] The mechanical actuator 30 is a part whose shape can vary. According to the invention, the mechanical actuator 30 comprises two parts 31, 32 movable relative to each other. The mechanical actuator 30 is arranged so as to be able to move the front glass 10 relative to the backlighting device 20. To do this, according to the invention, a first part 31 of the mechanical actuator 30 is in contact with the backlighting device 20, for example in abutment against it, and a second part 32 of the mechanical actuator 30 is connected to the front glass 10.

[0031] Thus, the front glass 10 is movable relative to the backlighting device 20. It is therefore possible to move the front glass 10 and the modulator 12 relative to the backlighting device 20. Thus, it is for example possible to move only the front glass 10 and the modulator 12 relative to a structure secured to the backlighting device 20, as explained below, that is to say without moving the backlighting device 20.

[0032] Moving the front glass 10 with the modulator 12 and keeping them fixed relative to each other makes it possible not to degrade the quality of the image intended for the user, even during movements. Indeed, the optical adhesive 11 prevents, for example, the formation of air bubbles between the front glass 10 and the modulator 12.

[0033] The mass to be vibrated to provide haptic feedback, when the user touches the front face 14 of the front glass 10, is therefore less than the mass of the display device 1.

[0034] Therefore, for a predetermined haptic performance, a mechanical actuator 30 of a size smaller than the size of a mechanical actuator necessary to vibrate the entire display device 1 can be provided. It is also possible, for a given mechanical actuator size, to use fewer mechanical actuators 30 than to vibrate the entire display device 1.

[0035] Here, the high rigidity of the protective casing makes it possible to transmit the movement of the mechanical actuator 30 to the front glass 10 efficiently, i.e. without energy loss, since the mechanical actuator 30 here bears on this protective casing. The movement of the mechanical actuator 30 is not absorbed by the backlighting device 20.

[0036] It is also possible to provide for the mechanical actuator 30 to bear on another rigid surface, for example on the dashboard of the vehicle. For example, it is possible to provide for the mechanical actuator 30 to bear on a structure 60 supporting the display device 1, as shown in figure 2 .

[0037] Such a display device 1 is compact and can therefore be easily integrated into a vehicle dashboard. Such a display device 1 can also reduce manufacturing costs by using fewer mechanical actuators.

[0038] Here, an electric current can vary the length of the mechanical actuator 30, here its dimension in the X direction. Thus, the mechanical actuator 30 can move the front glass 10, relative to the backlighting device 20, in the reference plane XZ in the X direction.

[0039] Alternatively, the electric current could vary the shape of the mechanical actuator in another direction of the reference plane or in a direction outside the reference plane, for example orthogonal to the reference plane.

[0040] As explained above, the display device 1 described here comprises a single mechanical actuator 30 allowing movement of the front glass 10 in one direction, here the X direction. Of course, another mechanical actuator oriented in another direction can be provided allowing movement of the front glass 10 in this other direction, for example the other direction of the reference plane XZ orthogonal to the last, here therefore the Z direction.

[0041] Here, the mechanical actuator 30 is a piezoelectric actuator. The advantages of a piezoelectric actuator include its small size and good haptic performance in terms of acceleration, displacement and force. Alternatively, the mechanical actuator could be a magnetic actuator comprising a solenoid, a shape memory actuator or even an artificial muscle.

[0042] As shown in the figure 3 , the piezoelectric actuator 30 comprises a central part 38 made of piezoelectric ceramic. When an electrical voltage is applied to the central part 38, the latter contracts, here along the Z axis. Under the effect of this contraction, two lateral parts 39, each fixed to the two ends of the central part 38, deform elastically by moving away from each other, here along the X axis. Such a piezoelectric actuator 30 is described as “amplified” because the displacement of the lateral parts 39 along the X axis is greater than the deformation of the piezoelectric ceramic of the central part 38. On the figures 1 et 2 , the piezoelectric actuator 30 is shown along the section plane AA of the figure 3 . Here, the two moving parts 31, 32 of the mechanical actuator 30 shown in the figures 1 et 2 correspond to the two side parts 39.

[0043] As shown in the figure 1 , the first part 31 of the mechanical actuator 30 is connected to the backlighting device 20 at a peripheral edge 21. The second part 32 of the mechanical actuator 30 is connected to the front glass 10 via a first connecting element 40.

[0044] The first connecting element 40 is fixed to the mechanical actuator 30 by a first part called the first arm 41. The first connecting element 40 is fixed, for example glued, to the facade glass 10 by a second part called the second arm 42.

[0045] The first connecting element 40 is rigid so as to transmit without loss of energy the movement of the mechanical actuator 30 to the facade glass 10. For example, the first connecting element 40 can be made of plastic, for example nylon, or metal.

[0046] Here, the first connecting element 40 has a profile, according to the XY plane of the figure 1 , at right angles. This means that the first arm 41 and the second arm 42 form a right angle. This at right angles profile makes it possible to have contact surfaces between the first connecting element 40 and the facade glass 10 and between the first connecting element 40 and the mechanical actuator 30 sufficient to have effective fixings while minimizing the size of the first connecting element 40.

[0047] As shown in the figure 1 , the display device 1 comprises at least one second connecting element 45 which is fixed to the front glass 10, and at least one spring 35 which is in contact by a first end 36 with the backlighting device 20, here at its peripheral edge 21, and by a second end 37 with the second connecting element 45.

[0048] Here, the second connecting element 45 has a right-angled profile. This right-angled profile makes it possible to have contact surfaces between the second connecting element 45 and the facade glass 10 and between the second connecting element 45 and the spring 35 sufficient to have effective fixings while minimizing the size of the second connecting element 45.

[0049] In the same way as for the mechanical actuator 30, the display device 1 described here comprises a single spring 35 and a single associated second element 45. Of course, the display device 1 can comprise several springs 35, for example one spring 35 per mechanical actuator 30. As a variant, it could be provided that the spring 35 is replaced by another mechanical actuator whose deformations would be opposite to that of the mechanical actuator 30. The mechanical actuators could be force-assembled around the image generation device to create a prestress.

[0050] The spring 35 has two ends 36, 37 movable relative to each other: the first end 36 is in contact with the backlighting device 20, for example in abutment against the latter, the second end 37 is in contact, here fixed, to the second connecting element 45. As a variant, it could be provided that the first end of the spring is also fixed to the backlighting device.

[0051] The spring 35 is arranged so as to pre-stress the mechanical actuator 30 and / or to return the facade glass 10 to an equilibrium position.

[0052] Here, the spring 35 is a flexing blade. Alternatively, one could provide that the spring is a winding of a metal rod.

[0053] The spring 35 and the mechanical actuator 30 are placed on either side of the backlighting device 20. Here, the spring 35 exerts a force which tends to push the second connecting element 45 back relative to the backlighting device 20. In this way, the mechanical actuator 30 is pre-stressed between the first connecting element 40 and the backlighting device 20. The pre-stressing ensures that there is no play at the mechanical actuator 30.

[0054] In addition, when the mechanical actuator 30 is set in motion and extends to move the front glass 10, the spring 35 exerts a restoring force which returns the front glass 10 to an equilibrium position. The equilibrium position of the front glass 10 is the position in which the front glass 10 is located when the mechanical actuator 30 is not in operation, i.e. when it is not powered by an electric current.

[0055] In the case where the display device 1 comprises several mechanical actuators 30 and / or several springs 35, it would be possible, for example, to provide: a first connecting element 40 per mechanical actuator 30 and a second connecting element 45 per spring 35; a single connecting element 40, 45 surrounding the entire peripheral edge 21 of the backlighting device 20; first connecting elements 40 and / or second connecting elements 45 connecting several mechanical actuators 30 and / or springs 35.

[0056] In this case, the display device 1 preferably comprises a first connecting element 40 common to the mechanical actuators 30 and a second connecting element 45 common to the springs 35.

[0057] As shown in the figure 1 , a protective element 50 is located between the front glass 10 and the backlighting device 20. The protective element 50 is arranged on the periphery of the backlighting device 20. The protective element 50 is in contact both with the backlighting device 20, near its peripheral edge 21, and with the rear face 13 of the front glass 10, on a portion of the rear face 13 not covered by the modulator 12.

[0058] The protective element 50 has a shape adapted to the periphery of the backlighting device 20. Here, for example, the protective element 50 has a generally annular shape and a rectangular section. Here, the dimensions of the protective element 50 in the YZ plane are greater than those of the modulator 12 and less than those of the backlighting device 20. In other words, the protective element 50 is a frame which surrounds the modulator 12.

[0059] Here, the protective element 50 is a foam, for example a polyester foam.

[0060] The protective element 50 is fixed, for example glued, to the backlighting device 20. The protective element 50 slides on the front glass 10 when the latter is in motion. Conversely, as a variant, it could be provided that the protective element is glued to the front glass and slides on the backlighting device.

[0061] The protective element 50 prevents possible dust from entering the gap between the backlight device 20 and the modulator 12. The protective element 50 also prevents light leaks, for example light beams which would not pass through the modulator 12 and which could dazzle the user.

[0062] As shown in the figure 2 , the display device 1 may be supported by a structure 60. By “supported by the structure 60” is meant that the display device 1 is held integral with the structure 60, for example to be generally fixed in a frame of reference linked to the vehicle. The structure 60 is for example a part of the dashboard of the vehicle. Here, the structure 60 forms a housing surrounding the backlighting device 20, the mechanical actuator 30, the spring 35 and the connecting elements 40, 45, and is open at the level of the front glass 10.

[0063] The backlighting device 20 is fixed to the structure 60. Here, for example, screws 61 secure the backlighting device 20 to the structure 60.

[0064] The display device 1 comprises a flexible element designed to connect the front glass 10 to the structure 60. The flexible element 70 is located between the structure 60 and the front glass 10. The flexible element 70 is designed to allow movement of the front glass 10 relative to the structure 60, the front glass 10 can thus be moved by the mechanical actuator 30.

[0065] The flexible element 70 supports the front glass 10. In other words, the flexible element 70 holds the front glass 10 in position relative to the structure 60 and therefore relative to the backlighting device 20, while allowing the movement described above.

[0066] Alternatively, provision could be made for the front glass to be directly supported, relative to the backlighting device, by the mechanical actuator and / or the spring. For this, one or more mechanical actuators and one or more springs, specifically designed to provide support, could be distributed at the four corners of the display device. The mechanical actuator and / or the spring would then be attached to the backlighting device. The flexible element and the structure would then no longer be necessary to support the front glass. The backlighting device could be directly attached to a support, for example a vehicle dashboard.

[0067] The flexible element 70 has a shape adapted to the periphery of the front glass 10. Here, for example, the flexible element 70 has a generally annular shape and a rectangular section. Here, the dimensions of the flexible element 70 in the YZ plane are smaller than those of the front glass 10. In other words, the flexible element 70 is a frame which surrounds the backlighting device 20 and the connecting elements 40, 45. The thickness of the flexible element 70, here its dimension in the Y direction, is much smaller than its width and its length, here its dimensions in the XZ reference plane.

[0068] Here, the flexible element 70 in silicone.

[0069] To maintain the facade glass 10 relative to the structure 60, the flexible element 70 is fixed both to the structure 60 and to the facade glass 10. The flexible element 70 is for example glued, with an adhesive or a resin, by each of its two main faces respectively to the structure 60 and to the facade glass 10.

[0070] The dimensions and mechanical properties of the flexible element 70, for example its thickness and / or its Young's modulus, are determined such that the flexible element 70 can on the one hand hold the front glass 10 and on the other hand deform while remaining in elastic mode, when the mechanical actuator 30 sets the front glass 10 in motion relative to the backlighting device 20 and therefore relative to the structure 60.

[0071] For example, the stiffness of the flexible element 70 is between 5 and 50 N / mm, preferably between 5 and 25 N / mm. For example, the thickness of the flexible element 70 is between 0.2 mm and 3 mm, preferably between 0.2 mm and 1.5 mm.

[0072] In particular, the flexible element 70 is arranged so as to remain in an elastic deformation regime when the facade glass 10 undergoes an acceleration of at least 6 G and a displacement, for example in the reference plane XZ, of at least 100 micrometers relative to the structure 60. The flexible element is therefore arranged so as not to undergo plastic deformation when the facade glass 10 is in motion. In this context, an elastic deformation is a reversible deformation. The flexible element 70 returns to its initial shape after the displacement of the facade glass 10.

[0073] As shown in the figure 2 , the display device 1 comprises at least one force sensor 80 designed to detect the contact of a user's finger on the front face 14 of the front glass 10. Multiple force sensor technologies can be implemented in the display device 1. Thus, an inductive sensor, a resistive sensor or even an optical sensor could be provided. Here, the force sensor(s) 80 are strain gauges.

[0074] Here, as shown in the figure 2 , two force sensors 80 are used. It could be provided that the display device 1 comprises more than two force sensors, for example four force sensors distributed in the corners of the display device 1.

[0075] Each force sensor 80 is designed to detect a displacement of the facade glass 10 out of the reference plane XZ. Each force sensor 80 is in particular designed to measure a force exerted on the facade glass 10. Here, each force sensor 80 measures the component in the direction perpendicular to the reference plane XZ, i.e. here in the Y direction, of a force exerted on the facade glass 10.

[0076] Each force sensor 80 is calibrated to trigger the haptic feedback, i.e. the movement of the front glass 10 by the mechanical actuator 30, when the user exerts sufficient force on the front glass 10. This makes it possible to avoid false detections. The calibration of a trigger threshold for the haptic feedback can be done by the user using dedicated software.

[0077] The force sensors 80 can also make it possible to locate the contact area between the user's finger and the front glass 10, for example by triangulation.

[0078] Alternatively, the location of the contact zone is achieved by a dedicated transparent touch screen 15, of resistive or capacitive type. Such a touch screen 15 may for example comprise a layer of indium-tin oxide.

[0079] As shown in the figure 4 , such a touch screen 15 can be located between the front glass 10 and the modulator 12. Here, two layers of optical adhesive 11 make it possible to stick the touch screen 15 to the front glass 10 and the touch screen 15 to the modulator 12 respectively. Alternatively, the touch screen could be arranged on the front glass 10, as an external layer, in which case it could be referred to as a touch surface.

[0080] The two force sensors 80 are arranged between the front glass 10 and the structure 60. The two force sensors 80 are arranged near the flexible element 70. An elastomer support is located between the force sensor 80 and the structure 60. The elastomer support is for example glued to the structure 60. The elastomer support is arranged to ensure a preload on the force sensor 80. In practice, the hardness of this support is between 60 shores and 80 shores to have an efficient transmission of the movement of the front glass 10 to the force sensor 80 and therefore a good sensitivity.

[0081] Here, the contact between each force sensor 80 and the front glass 10 is sliding to adapt to the movements of the front glass 10. Alternatively, the contact could be ensured by double-sided adhesive tape.

[0082] A Teflon film 90 may be disposed on the surface of the backlight device 20, on the portion of the backlight device 20 in contact with the mechanical actuator 30. The Teflon film 90 allows the mechanical actuator 30 to slide against the backlight device 20 with the least possible friction.

[0083] Minimizing friction can be useful, for example, when the user exerts force on the front glass 10. This is because this slightly moves the front glass 10, mainly in a direction orthogonal to the reference plane XZ, which also slightly moves the mechanical actuator 30. Thanks to the Teflon film 90, the mechanical actuator 30 exerts very little resistance to the movement of the front glass 10 and therefore does not disturb the operation of the force sensors 80.

[0084] In addition, such a display device 1 can be designed with a total thickness of less than 15 mm. This allows it to be integrated into numerous applications such as a vehicle dashboard or more generally a control screen for an electronic device, for example an ultrasound scanner or a ticket dispenser.

Claims

1. A display device (1) comprising: - a front glass (10) ; - a backlighting device (20), designed to generate a source light beam ; - a modulator (12), integral with said front glass (10) and located between said front glass (10) and said backlighting device (20) so as to receive said source light beam and transmit a modulated light beam through said front glass (10); and - at least one mechanical actuator (30) comprising a first part (31) and a second part (32) movable relative to each other, the first part (31) being in contact with the backlighting device and the second part (32) being connected to the front glass; - said mechanical actuator (30) being arranged to move said front glass (10) relative to said backlighting device (20).

2. A display device (1) according to claim 1, wherein said mechanical actuator (30) is a piezoelectric actuator.

3. Display device (1) according to one of claims 1 to 2, comprising a first connecting element (40) fixed by a first part (41) to said mechanical actuator (30) and attached by a second part (42) to said front glass (10).

4. Display device (1) according to claim 3, wherein said first connecting element (40) has a profile forming two angled arms (41; 42), said mechanical actuator (30) being attached to a first arm (41) and said front glass (10) being attached to a second arm (42).

5. A display device (1) according to any of claims 1 to 4, wherein said modulator (12) is bonded to said front glass (10) by an optical adhesive (11).

6. Display device (1) according to one of claims 1 to 5, further comprising : - at least one second connecting element (45) attached to said front glass (10); and - at least one spring (35), in contact by a first end (36) with said backlighting device (20) and by a second end (37) with said second connecting element (45), so as to pre-stress said mechanical actuator (30) or to return said front glass (10) to an equilibrium position.

7. A display device (1) according to claim 6, wherein said second connecting element (45) has a square profile.

8. A display device (1) according to any of claims 1 to 7, wherein a protective member (50) is disposed at the periphery of said backlight device (20), between said backlight device (20) and said front glass (10).

9. Display device (1) according to one of claims 1 to 8, wherein said backlight device (20) comprises a housing made of magnesium.

10. Display device according to one of claims 1 to 9, comprising a Teflon surface (90) between said mechanical actuator (30) and said backlight device (20).

11. Display device (1) according to one of claims 1 to 10, said display device (1) comprising a flexible element (70) designed to connect said front glass (10) to a structure (60) and to allow movement of said front glass (10) relative to said structure (60).

12. Display device (1) according to claim 11, wherein said flexible element (70) is made of silicone.

13. Display device (1) according to one of claims 11 to 12, wherein said flexible element (70) is arranged so as to remain in an elastic deformation regime when said front glass (10) undergoes an acceleration of at least 6 G and a displacement of at least 100 micrometers relative to said structure (60).

14. Display device (1) according to one of claims 11 to 13, comprising at least one sensor (80), arranged between said front glass (10) and said structure (60), and designed to measure a force exerted on said front glass (10).