Electronic device comprising a rounded edge covered by a screen

Abstract

The invention relates to a portable electronic device (HW1) comprising a housing (5) and a screen (20) extending over a front wall (15) and over a rounded edge (11) of the housing, the screen comprising a termination (20b) extending over a rear wall (16b) of the housing. The device comprises a holding bar (30) arranged parallel to the rounded edge (11) of the housing, the holding bar comprising a proximal part (31) and a distal part (32), the proximal part (31) being fastened to the housing, the distal part (32) bearing on the termination (20b) of the screen in order to press it against the rear wall (16b) of the housing.

Description

Electronic device comprising a rounded edge covered by a screen

[0001] The present invention relates to a portable electronic device comprising a housing having a front wall, a rear wall, a rounded edge connecting the front wall and the rear wall, and a screen extending over the front wall and over the rounded edge, the screen comprising a termination extending over the rear wall. Background

[0002] A portable electronic device HW of the type mentioned above is described in international application WO 2024 / 056964. As shown in the cross-sectional view, the housing of the HW device comprises a first longitudinal wall 10 having a rounded outer edge, a second longitudinal wall 12, a front wall 15 forming the front face of the device, a rear wall 16 forming the rear face of the device, and a cover 17. The HW device also comprises a screen 20 which extends over the front wall 15, over the rounded edge 11 and over the rear wall 16. The rear wall 16 has a portion 16a parallel to the front wall 15 and a portion 16b inclined towards the interior of the housing.

[0003] The HW device offers the ergonomic advantage of being able to display information both on its front face 15 and on the rounded edge 11. However, its industrial-scale production can present challenges. Unlike some mobile phones that have a screen with a rounded edge at an angle of only a few degrees, the rounded edge 11 here has a 180° angle. This necessitates that the screen 20 have a termination extending onto the rear face 16 of the housing in order to connect it to a printed circuit board (PCB), for example, using a CR connector. The portion 16b of the wall 16, inclined towards the inside of the housing, is designed to facilitate the penetration of the screen termination into the housing.However, the screen may occasionally detach from part 16b, or components of the screen may detach from each other in the area where the screen passes over part 16b. This increases the number of defective devices produced and therefore affects manufacturing yields. Furthermore, a void, or volume 200, extending between the rear face of the housing and part 16b typically needs to be filled with adhesive. Air bubbles can become trapped in the adhesive, and these bubbles, expanding under the influence of heat, can damage the device, which also affects manufacturing yields.

[0004] It might therefore be desirable to improve the structure of such a portable electronic device and its manufacturing process, in order to reduce the risks of manufacturing defects and improve manufacturing yields. Summary

[0005] Embodiments relate to a portable electronic device comprising a housing having a front wall, a rear wall, and a rounded edge connecting the front wall and the rear wall, and a screen extending over the front wall and over the rounded edge, the screen including a termination extending over the rear wall, the device including a retaining bar of generally longitudinal shape arranged parallel to the rounded edge of the housing, the retaining bar including a proximal part and a distal part, the proximal part being fixed to the housing, the distal part being in contact with the termination of the screen in order to press it against the rear wall of the housing.

[0006] According to one embodiment, the rear wall of the case comprises a first part parallel to the front wall and a second part inclined towards the interior of the case, the screen termination comprises a first part extending over the first part of the rear wall, and a second part extending over the second part of the rear wall, and the distal part of the retaining bar rests on at least one region of the second part of the screen termination.

[0007] According to one embodiment, the device includes a protective sheet covering parts of the screen extending over the front wall, the rounded edge, the protective sheet including an end cap comprising a first part covering the first part of the screen end cap, and a second part parallel to the front wall of the housing and extending over the second part of the screen end cap, and the distal part of the retaining bar extending into a volume delimited by the second part of the end cap of the protective sheet and the second part of the screen end cap.

[0008] According to one embodiment, the distal part of the support bar has a beveled lower face extending over the second part of the screen termination and coming into contact with it.

[0009] According to one embodiment, the distal part of the retaining bar has a tapered end and is shaped to occupy most of the volume delimited by the second part of the termination of the protective sheet and the second part of the termination of the screen.

[0010] According to one embodiment, the screen termination includes a third part that is sandwiched between a support surface present in the housing and the proximal part of the retaining bar.

[0011] According to one embodiment, the retaining bar is fixed to the housing by its ends.

[0012] According to one embodiment, the retaining bar, when detached from the housing, has a concave shape, in order to ensure that a central part of the distal part of the retaining bar is in contact with the end of the screen.

[0013] According to one embodiment, the screen comprises the superposition of a display and a touch module.

[0014] According to one embodiment, the device forms a hardware wallet for crypto-assets.

[0015] Embodiments also relating to a method of manufacturing a portable electronic device comprising the steps of providing a housing including a front wall, a rear wall, and a rounded edge connecting the front wall and the rear wall, and arranging a screen on the front wall and on the rounded edge, and arranging a screen termination on the rear wall, the method also comprising the steps of providing a retaining bar of generally longitudinal shape comprising a proximal portion, a distal portion and an intermediate portion connecting the proximal and distal portions, arranging the retaining bar in the housing parallel to the rounded edge of the housing, and arranging the distal portion of the retaining bar on the screen termination, so as to press it against the rear wall of the housing, and fixing the proximal portion of the retaining bar in the housing.

[0016] According to one embodiment, the method includes the steps of providing, on the rear wall of the case, a first part of the rear wall parallel to the front wall and a second part of the rear wall inclined towards the inside of the case, arranging a first part of the screen termination on the first part of the rear wall, arranging a second part of the screen termination on the second part of the rear wall, and arranging the distal part of the retaining bar in support on at least one region of the second part of the screen termination.

[0017] According to one embodiment, the method comprises the steps of covering, with a protective sheet, parts of the screen extending over the front wall, the rounded edge, covering the first part of the screen termination with a first part of a termination of the protective sheet, arranging above the second part of the screen termination a second part of the termination of the protective sheet, the second part of the termination of the protective sheet being parallel to the front wall of the housing, and arranging the distal part of the retaining bar extending into a volume delimited by the second part of the termination of the protective sheet and the second part of the screen termination.

[0018] According to one embodiment, the method includes a step of giving the distal part of the retaining bar a beveled lower face extending over and in contact with the second part of the screen termination, and a flat upper face serving as a support for the second part of the protective sheet termination.

[0019] According to one embodiment, the method includes the step of giving the distal part of the retaining bar a tapered end shaped to occupy most of the volume delimited by the second part of the termination of the protective sheet and the second part of the termination of the screen.

[0020] According to one embodiment, the method includes the step of arranging a third part of the screen between a support surface provided in the housing and the proximal part of the retaining bar.

[0021] According to one embodiment, the retaining bar is fixed to the housing by its ends.

[0022] According to one embodiment, the method includes a step of giving the retaining bar, before its assembly in the housing, a concave shape, in order to ensure that a central part of the distal part of the bar is in contact with the end of the screen.

[0023] According to one embodiment, the process includes the steps of providing two fixing lugs at two ends of the support bar, and providing in the housing two receiving shoulders for the fixing lugs of the support bar.

[0024] According to one embodiment, the process includes a step of assembling a display and a touch module together forming the screen. Brief description of the drawings

[0025] Examples of improvements to a portable electronic device of the aforementioned type and its manufacturing process will be described below, without limitation, in relation to the attached figures, including:

[0026] The previously described image is a cross-sectional view of a typical portable electronic device.

[0027] This is a cross-sectional view of the casing of a portable electronic device implementing an improvement according to this disclosure.

[0028] This is a top-down perspective view of the casing.

[0029] This is a cross-sectional view of a portable electronic device including the casing of the,

[0030] Lamontre, a first embodiment of a support bar present in the device of the,

[0031] Lamontre, a second embodiment of the grab bar,

[0032] This is a cross-sectional view of the support bar.

[0033] This is a cross-sectional view of an electronic device including the casing and the retaining bar.

[0034] This is an enlarged view of a part of the,

[0035] Laet and Lamontrent show a variant of the support bar of the,

[0036] Lamontre, a display present in the device of the,

[0037] Lamontre, a touch module present in the device of the,

[0038] Lamontre, a protective sheet present in the device of the,

[0039] The images illustrate the steps in a manufacturing process for a portable electronic device as described in this disclosure.

[0040] This is a cross-sectional view of the device after completion of the steps illustrated in Figures 14 and 15, and

[0041] This illustrates another step in the manufacturing process of the electronic device. Detailed description

[0042] Figures 2 and 3 show the housing 5 of a portable electronic device HW1 in which improvements according to this disclosure are implemented. Figure 1 is a cross-sectional view of the housing with a cover 17. Figure 2 is a top and perspective view of the housing without the cover 17. The housing 5 comprises a first longitudinal wall 10 having a rounded outer edge 11, a second longitudinal wall 12, a first transverse side wall 13, a second transverse side wall 14, a front wall 15, and a rear wall 16. In the embodiment shown by way of non-limiting example, and as shown in Figure 1, the walls 10, 12 to 16 are machined from a solid piece of aluminum, giving the wall 10 a significant thickness. Thus, a portion 15-1 of the front wall 15 is formed by the front face of the wall 10, and the rear wall 16 is formed by the rear face of the wall 10.In other embodiments, part 15-1 of the front wall 15 and the rear wall 16 could be entirely separate.

[0043] The rear wall 16 covers only part of the rear face of the housing, which is closed by the cover 17. The wall 16 comprises, immediately after the rounded edge 11, a portion 16a parallel to the front wall 15 followed by a portion 16b inclined towards the interior of the housing, formed here by machining the thick wall 10. The interior of the housing 5 also includes a support surface 110, the function of which will be described later. The support surface 110 is, for example, formed by the top of an internal partition of the housing arranged midway between the side walls 13, 14 ().

[0044] This is a cross-sectional view of a portable electronic device HW1 made from the housing 5. Inside the housing, the device contains a battery (not shown) and a printed circuit board (PCB) supporting various electronic components. The device also includes a touchscreen 20 covered by a protective sheet 23, also called a "cover lens." The touchscreen 20 is made by superimposing a display 21 and a touch module 22.

[0045] The screen 20 extends across the front wall 15 and the rounded edge 11 and has a termination on the rear face of the housing comprising parts 20a, 20b, and 20c. Part 20a extends across part 16a of the rear wall 16. Part 20b extends across part 16b, which is inclined towards the inside of the housing. Part 20c extends inside the housing and rests on the support surface 110. Beyond part 20c, the screen 20 is connected to ribbon cables whose ends are fitted with connectors 215 and 226 plugged into the printed circuit board (PCB).

[0046] The protective sheet 23 covers the screen on the front wall 15 and on the rounded edge 11 and itself has, on the rear face of the housing, a termination comprising parts 23a and 23b. Part 23a extends over part 20a of the screen. Part 23b overhangs part 20b of the screen but remains parallel to the front wall 15. A void 200 is thus visible in the diagram, extending between part 23b of the protective sheet and part 20b of the screen. In practice, such a volume 200 is not left empty and is filled with adhesive during the manufacture of the device.

[0047] According to one aspect of this improvement, the HW1 device comprises a generally longitudinal support bar 30, an embodiment of which is shown in the figure. The support bar 30 comprises a proximal portion 31, a distal portion 32 having a flat upper face 322, and an intermediate portion 33 connecting the proximal portion 31 and the distal portion 32. The proximal portion 31 extends in a plane P1 and the distal portion 32 extends in a plane P2, the planes P1 and P2 being substantially offset by a height H12. The proximal portion 31 has two mounting tabs 34, 35 provided with mounting holes for attachment to the housing 5 by means of screws 50, 51.

[0048] With reference to the figure, the housing 5 has a shoulder 130 formed in the wall 13 to receive the mounting tab 34, and a shoulder 140 formed in the wall 14 to receive the mounting tab 35 (since shoulder 140 is hidden by the wall 14 in the figure, reference may be made to Figures 14 and 15 described later). Each shoulder 130, 140 has a tapped hole 131, 141 allowing the corresponding tab 34, 35 to be fixed by means of the screw 50, 51. Returning to the figure, the mounting tabs 34, 35 extend here in a mounting plane P0 corresponding to that of the shoulders 140, 141, which is located substantially below the plane P1.

[0049] The watch features a retaining bar 30 fixed within the housing. Part 20c of the screen is sandwiched between the support surface 110 and the proximal part 31 of the retaining bar 30. The distal part 32 of the retaining bar 30 extends into the volume 200, and its distal edge rests against part 20b of the screen, which is thus pressed against part 16b of the rear wall of the housing. Furthermore, part 23b of the protective sheet 23 rests against the upper face 322 of the distal part 32 of the retaining bar.

[0050] Figure 30 represents a variant of the support bar and is a cross-sectional view thereof. Like the support bar 30, the support bar 30' comprises a proximal portion 31', a distal portion 32' with a flat upper face 322', and an intermediate portion 33' connecting the proximal portion 31' and the distal portion 32'. Two mounting tabs 34', 35' with mounting holes are also provided at both ends of the proximal portion 31'. The distal portion 32' of the support bar 30' differs from that of the support bar 30 in that it has a beveled rear face 320 that tends to meet the flat upper face 322', giving the distal portion 32 a tapered shape and a substantially pointed end.

[0051] Figure 1 is a partial cross-sectional view of the HW1 device equipped with the 30' retaining bar. Figure 2 is an enlarged view of the portion of the HW1 device receiving the 30' retaining bar. The distal portion 32' of the 30' retaining bar, due to its tapered shape, occupies most of the volume 200 extending between the screen portion 20b and the protective sheet portion 23b. The remaining volume not occupied by the distal portion 32' of part 32 is filled with adhesive, but this residual volume is very small, so the risk of air bubble encapsulation, which could be detrimental to the device's manufacturing performance, is itself considerably reduced, even negligible or nonexistent. Such air bubbles, expanding under the effect of an increase in temperature, can indeed detach the protective sheet 23 from the touch module 22 and this detachment can increase over time.

[0052] The lower face 320 of the distal part 32 of the support bar optionally has a recess 325 (see also) reducing its contact area with the part 20b of the screen, so as not to exert excessive stress on it. This recess 325 creates an additional residual volume, but one that is sufficiently small to prevent the encapsulation of air bubbles.

[0053] Laet and Lamontent demonstrate a preferred embodiment of the support bar 30'. The support bar 30' is pre-stressed after manufacturing and, when not screwed onto the housing, has a concave curve with a low point located midway between its ends. Thus, when the bar 30' is screwed onto the housing, the low point of its proximal portion 31' is the first point to come into contact with the support surface 110, and the low point of its distal portion 32' is the first point to come into contact with the screen 20b. As it is screwed onto the housing, the bar 30' straightens and gradually becomes straight again. This concave shape ensures that the distal portion 32' of the bar 30' rests on the screen 20b across its entire width.

[0054] The depth of the concavity is, for example, on the order of 0.25 to 0.8 mm for a length L of the 30' support bar of the order of 83 mm, i.e. a corresponding concavity of the order of 0.3% to 0.9% and more generally between 0.25% and 1% for an aluminium support bar, or any other range of values ​​depending on the material used.

[0055] In an exemplary and non-limiting embodiment, the 30, 30' support bar has the following characteristics:

[0056] - a length L of 83 mm,

[0057] - a width l () of 6.25 mm,

[0058] - a thickness of its distal part 32' of approximately 0.1 mm,

[0059] - a thickness of its proximal part 31' of approximately 0.5 mm,

[0060] - a functional height H12 (figures 5 and 7, distance between planes P1 and P2) of the order of 0.65 mm.

[0061] - a total height HT (figures 5 and 7) of the order of 1.85 mm.

[0062] In one embodiment, the retaining bar 30 is made from a sheet of steel bent at the end of its distal part 32 () to obtain a soft contact edge 32c with the part 20b of the screen.

[0063] In another embodiment, the support bar 30' is made of machined aluminum. The beveled face 320 of its distal part 32 comes into contact with the part 20b of the screen along a transverse contact line seen in cross-section and represented by a point CL. This contact line forms the tangent between the plane of the rear face 320 of the distal part and a hypothetical cylinder in which the part 16b of the rear wall 16 would be inscribed.

[0064] In an exemplary and non-limiting embodiment, the display 21 has a thickness of approximately 0.16 mm and the touch module 22 has a thickness of approximately 0.15 mm. A layer of adhesive between these two elements is approximately 0.025 mm thick. The protective sheet 23 has a thickness of approximately 0.07 to 0.08 mm, and a layer of adhesive between the touch module 22 and the protective sheet 23 is approximately 0.05 mm thick. In one embodiment, the protective sheet 23 is made of PMMA (polymethyl methacrylate), a transparent thermoplastic polymer with excellent optical properties. The adhesive used to assemble these elements and fill the volume 200 is, for example, a cyanoacrylate adhesive such as 2-methyl cyanoacrylate or 2-octyl cyanoacrylate.

[0065] In one embodiment shown in the figure, the display 21 comprises an active area 211 (display area) and a frame 212, and is made on a flexible substrate 213. The flexible substrate 213 extends beyond the active area 211 and receives a row and column multiplexer 214, as well as the aforementioned connector 215, enabling it to be connected to the printed circuit board.

[0066] In one embodiment shown in the figure, the touch module 22 comprises a cover surface 220 and a frame 221, the assembly being mounted on a flexible support 222. The cover surface 220 includes a touch area 220a and a non-touch area 220b. The non-touch area covers the rounded edge 11 of the housing, where information is to be displayed without a touch effect. The flexible support 222 also includes an extension 224 receiving a control chip 225 and the aforementioned connector 226 for connecting the touch module 22 to the printed circuit board.

[0067] In one embodiment shown in the figure, the protective lens 23 has a transparent area 230 and a painted frame 231. It includes a moisture-resistant coating, a hard anti-reflective coating and an optically clear adhesive on its back face for assembly onto the touch module 22.

[0068] Figures 14 to 17 illustrate steps in a manufacturing process for the HW1 portable electronic device involving the retaining bar 30'. In one step shown in Figure 1, the screen 20 was glued to the front wall 15 and the rounded edge 11 of the housing. In another step shown in Figure 2, the screen 20 was glued to parts 16a, 16b of the rear wall 16. The retaining bar 30' is positioned above the housing 5 so that its mounting tabs 34', 35' fit into the shoulders 130, 140 of the housing. The retaining bar 30' is then secured by inserting the screws 50, 51 into the tapped holes 131, 141. In a step shown in Figure 1, a cross-sectional view of the retaining bar 30' shows the retaining bar being attached to the housing. Its distal part 32' presses part 20b of the screen 20 against part 16b of the rear wall of the housing and its proximal part 31' extends above part 20c of the screen, which rests on the support surface 110 (not visible on the, see).At a step illustrated on the, the protective sheet 23 was glued onto the screen, from the front face of the case, then onto the rounded edge 11, and then onto the distal part 32' of the retaining bar 30', which is therefore covered by part 23b of the protective sheet 23 (see also).

[0069] The manufacturing process of an electronic device which has just been described, involving the support bar 30 or 30', makes it possible to prevent the part 20b of the screen 20 from detaching from the inclined part 16b of the rear wall 16 or to prevent the touch module 22 from detaching from the display 21 in this same region, which can occur when the touch module is more rigid than the display.

[0070] This process also avoids the formation of air bubbles in the glue by occupying the volume 200 (figures 4, 8, 9) with the distal part 32, 32' of the retaining bar 30, 30', especially if the embodiment 30' of the retaining bar is retained.

[0071] Moreover, incidentally but advantageously, the flat upper face 322 or 322' of the distal part 32 or 32' of the retaining bar also serves as a support for part 23b of the protective sheet 23, as seen above (or 9).

[0072] Also incidentally but advantageously, the upper face of the proximal part 31 or 31' of the retaining bar 30 or 30' can serve as a support for an edge of the hood 17. In this case, a wall 330, 330' of the intermediate part 33, 33' of the retaining bar 30, 30' can also serve as a lateral stop for the hood 17, as seen in figures 4 and 8.

[0073] It will be clear to the person skilled in the art that the retaining bar 30, 30' and the housing which receives it are susceptible to various other variants and embodiments, particularly with regard to the shape of the retaining bar, its means of attachment to the housing, as well as the profile of the rear face of the housing on which its distal part 32, 32' rests to keep the screen pressed against the housing.

[0074] Although the previously described embodiments relate to a touchscreen comprising a display and a touch module, the manufacturing process just described also applies to the fabrication of a device comprising only a display without a touch module. In one embodiment, the HW1 portable electronic device fabricated according to this process is a hardware crypto-asset wallet as described in international application WO 2024 / 056964, the main processor of which is a secure element configured to perform cryptographic calculations and, in particular, to sign transactions intended to be recorded on a blockchain.

Claims

A portable electronic device (HW1) comprising: - a housing (5) having a front wall (15), a rear wall (16, 16a, 16b), and a rounded edge (11) connecting the front wall (15) and the rear wall (16), and - a screen (20, 21, 22) extending over the front wall (15) and the rounded edge (11), the screen having a termination (20a, 20b) extending over the rear wall (16, 16a, 16b), characterized in that it comprises a retaining bar (30, 30') of generally longitudinal shape arranged parallel to the rounded edge (11) of the housing, the retaining bar comprising a proximal portion (31, 31') and a distal portion (32, 32'), the proximal portion (31, 31') being fixed to the housing, the distal portion (32, 32') being supported on the end (20b) of the screen in order to press it against the rear wall (16b) of the case. Device according to claim 1, wherein: - the rear wall (16, 16a, 16b) of the housing comprises a first part (16a) parallel to the front wall (15) and a second part (16b) inclined towards the interior of the housing, - the screen termination comprises a first part (20a) extending over the first part (16a) of the rear wall, and a second part (20b) extending over the second part (16b) of the rear wall, and - the distal part (32, 32') of the retaining bar is supported on at least one region of the second part (20b) of the screen termination. Device according to claim 2, comprising a protective sheet (23) covering parts of the screen extending over the front wall (15), the rounded edge (11), the protective sheet comprising an end comprising a first part (23a) covering the first part (20a) of the screen end, and a second part (23b) parallel to the front wall (15) of the housing and extending over the second part (20b) of the screen end, and in which the distal part (32, 32') of the retaining bar extends into a volume (200) delimited by the second part (23b) of the protective sheet end and the second part (20b) of the screen end. Device according to claim 3, wherein the distal part (32') of the retaining bar (30') has a beveled lower face (320) extending over the second part (20b) of the screen termination and coming into contact (CL) with it. Device according to claim 4, wherein the distal part (32, 32') of the retaining bar (30, 30') has a tapered end and is shaped to occupy most of the volume (200) delimited by the second part (23b) of the termination of the protective sheet and the second part (20b) of the termination of the screen. Device according to any one of claims 2 and 5, wherein the screen termination comprises a third part (20c) which is sandwiched between a support surface (15) present in the housing and the proximal part (31, 31') of the retaining bar. Device according to any one of claims 1 to 6, wherein the retaining bar (30, 30') is fixed to the housing by its ends (34, 34', 35, 35'). Device according to claim 7, wherein the retaining bar (30, 30') has, when detached from the housing, a concave shape, in order to ensure that a central part of the distal part (32, 32') of the retaining bar is in contact with the termination (20b) of the screen. Device according to any one of claims 1 to 8, wherein the screen (20) comprises the superposition of a display (21) and a touch module (22). Device according to any one of claims 1 to 9, forming a hardware wallet for crypto-assets. A method for manufacturing a portable electronic device (HW1) comprising the steps of: - providing a housing (5) comprising a front wall (15), a rear wall (16, 16a, 16b), and a rounded edge (11) connecting the front wall (15) and the rear wall (16), and - arranging a screen (20, 21, 22) on the front wall (15) and on the rounded edge (11), and arranging a termination (20a, 20b) of the screen on the rear wall (16, 16a, 16b), a method characterized in that it also comprises the steps of: - providing a support bar (30, 30') of generally longitudinal shape comprising a proximal portion (31, 31'), a distal portion (32, 32') and an intermediate portion (33, 33') connecting the proximal portion (31, 31') and the distal portion (32, 32'),- arrange the retaining bar (30, 30') in the housing parallel to the rounded edge (11) of the housing, and arrange the distal part (32, 32') of the retaining bar on the termination (20b) of the screen,in order to attach it against the rear wall (16b) of the housing, and to fix the proximal part (31, 31') of the retaining bar in the housing. A method according to claim 11, comprising the steps of: - providing, on the rear wall (16, 16a, 16b) of the housing, a first part (16a) of the rear wall parallel to the front wall (15) and a second part (16b) of the rear wall inclined towards the inside of the housing, - arranging a first part (20a) of the screen termination on the first part (16a) of the rear wall, - arranging a second part (20b) of the screen termination on the second part (16b) of the rear wall, and - arranging the distal part (32, 32') of the retaining bar in support of at least one region of the second part (20b) of the screen termination. A method according to claim 12, comprising the steps of: - covering, with a protective sheet (23), parts of the screen extending over the front wall (15), the rounded edge (11), - covering the first part (20a) of the screen termination with a first part (23a) of a termination of the protective sheet, - arranging above the second part (20b) of the screen termination a second part (23b) of the termination of the protective sheet, the second part (23b) of the termination of the protective sheet (23) being parallel to the front wall (15) of the housing, and - arranging the distal part (32, 32') of the retaining bar extending into a volume (200) delimited by the second part (23b) of the termination of the protective sheet and the second part (20b) of the screen termination. Method according to claim 13, comprising a step of giving to the distal part (32') of the retaining bar (30') a beveled lower face (320) extending over the second part (20b) of the screen termination and coming into contact (CL) with it, and a flat upper face (322) serving as a support for the second part (23b) of the termination of the protective sheet (23). Method according to claim 14, comprising the step of giving the distal part (32, 32') of the retaining bar (30, 30') a tapered end shaped to occupy most of the volume (200) delimited by the second part (23b) of the termination of the protective sheet and the second part (20b) of the termination of the screen. Method according to any one of claims 12 and 15, comprising the step of arranging a third part (20c) of the screen between a support surface (15) provided in the housing and the proximal part (31, 31') of the retaining bar. Method according to any one of claims 11 to 16, wherein the retaining bar (30, 30') is fixed to the housing by its ends (34, 34', 35, 35'). Method according to claim 17, comprising a step of giving the retaining bar (30, 30'), before its assembly in the housing, a concave shape, in order to ensure that a central part of the distal part (32, 32') of the bar is in contact with the termination (20b) of the screen. Method according to any one of claims 11 to 18, comprising the steps of:- providing two fixing lugs (34, 34', 35, 35') at two ends of the support bar, and- providing in the housing two shoulders (130, 140) for receiving the fixing lugs of the support bar. Method according to any one of claims 11 to 19, comprising a step of assembling a display (21) and a touch module (22) together forming the screen (20).

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