Display device

Abstract

The utility model relates to the technical field of display, in particular to a display device, and aims to solve the problem of how to reduce the frame size of the display device. In order to achieve the purpose, the display device comprises a shell, the shell comprises a bottom plate and a side plate, and a containing space with an opening is formed between the bottom plate and the side plate; the display module is located in the containing space, and the display module comprises a flexible circuit board; the cover plate is connected with the front surface of the display module and seals the opening; the first enclosing wall extends from the cover plate to the bottom plate at the position close to the side plate; the first filling part is located between the first enclosing wall and the flexible circuit board, at least part of the flexible circuit board is wrapped by the first filling part, and the first filling part and the cover plate are fixed in an adhesive mode; the second filling part covers the first filling part, and the modulus of the first filling part is larger than the modulus of the second filling part and the modulus of the first enclosing wall. The frame size of the display device can be reduced, and the impact resistance of the display device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, and specifically provides a display device. BACKGROUND

[0002] With the rapid development of display technology, in order to obtain higher screen ratio and provide better visual experience for users, the design concept of narrow frame is paid more and more attention. The narrow frame scheme is mainly embodied by bending the flexible circuit board in the display module binding area to bend the driving chip to the back of the display module, however, affected by the bonding surface of the cover glass of the display device and the whole machine shell, there is still a large gap between the flexible circuit board and the sidewall of the shell, which leads to the difficulty of further breakthrough of the narrow frame design. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to solve the above technical problem, that is, to solve the problem of reducing the frame size of the display device.

[0004] To this end, the present application provides a display device, which comprises:

[0005] A shell comprising a bottom plate and a side plate connected to the bottom plate, and a containing space with an opening formed between the bottom plate and the side plate;

[0006] A display module located in the containing space, the display module comprising a flexible circuit board, the flexible circuit board being bent from the front surface of the display module to the back surface of the display module;

[0007] A cover plate connected to the front surface of the display module and closing the opening;

[0008] A first enclosing wall extending from the cover plate towards the bottom plate at a position adjacent to the side plate;

[0009] A first filling part located between the first enclosing wall and the flexible circuit board, the first filling part covering at least part of the flexible circuit board, and the first filling part being adhesively fixed with the cover plate;

[0010] A second filling part covering the surface of the first filling part towards the bottom plate, the modulus of the first filling part being greater than the modulus of the second filling part and the modulus of the first enclosing wall.

[0011] In one technical solution of the above display device, the display device further comprises:

[0012] A second enclosing wall extending from the back surface of the display module towards the bottom plate, the second enclosing wall being oppositely arranged with the first enclosing wall, the first enclosing wall and the second enclosing wall defining a filling area, and the first filling part and the second filling part being located in the filling area.

[0013] In one of the display devices, the modulus of the second wall is greater than the modulus of the second filling part and the modulus of the first wall.

[0014] In one of the display devices, the second wall comprises a first sub-part close to the display module and a second sub-part close to the bottom plate, and the modulus of the first sub-part is greater than the modulus of the second sub-part.

[0015] In one of the display devices, the first wall is fixedly bonded to the side plate, and the second filling part is fixedly bonded to the bottom plate.

[0016] In one of the display devices, the display device further comprises a bonding layer between the second filling part and the bottom plate, and the bonding layer is used to fixedly bond the second filling part to the bottom plate.

[0017] In one of the display devices, the first filling part exceeds the back surface of the display module by 0.2-0.3 mm in the direction from the display module to the bottom plate.

[0018] In one of the display devices, the width of the first wall and / or the second wall is 0.24-0.29 mm.

[0019] In one of the display devices, the hardness of the first filling part is greater than the hardness of the second filling part and the first wall.

[0020] In one of the display devices, the first filling part, the second filling part, the first wall and the second wall form a ring structure along the circumference of the display module.

[0021] In the above technical solutions, the first filling part, the second filling part and the first wall are filled in the area between the shell, the display module and the cover plate, and the first wall and the first filling part are fixedly bonded to the cover plate after being filled and solidified, so as to ensure the adhesion and sealing of the cover plate. On the basis of realizing the bonding and sealing between the first filling part, the second filling part, the first wall and the cover plate, compared with the prior art which realizes the sealing connection of the cover plate by arranging a protruding part on the shell, the width of the overall structure formed by the first filling part, the second filling part and the first wall can be smaller, so as to further reduce the frame width of the display device and meet the design concept of "narrow frame".

[0022] In another aspect, the first filling part is at a relatively high modulus, and the second filling part and the first wall are at a relatively low modulus by distinguishing the modulus of the first filling part, the second filling part and the first wall. Thus, for the display device, the first wall and the second filling part in the peripheral region are mainly responsible for absorbing impact energy, and the first filling part in the inner region is responsible for resisting impact force to protect the display module. Therefore, by distinguishing the modulus of the two regions, not only can the transmission of ground impact force to the display module be delayed after the display device falls, but also the display module can be effectively protected, thereby improving the impact resistance of the display device. BRIEF DESCRIPTION OF DRAWINGS

[0023] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, in which:

[0024] Figure 1 is a top view of a display device;

[0025] Figure 2 is a longitudinal sectional view of the display device in the related art along Figure 1 A-A line;

[0026] Figure 3 is a longitudinal sectional view of the display device according to an embodiment of the present application;

[0027] Figure 4 is a partial view of the display device in the related art near the flexible panel; Figure 3

[0028] is a partial view of the display device near the flexible panel according to an embodiment of the present application; Figures 5-8 In the drawings, the reference signs refer to the following:

[0029] 100, housing; 101, bottom plate; 102, side plate; 11, protrusion; 12, adhesive layer; 200, display module; 201, flexible circuit board; 202, display panel; 203, first adhesive film; 204, SCF layer; 205, PET layer; 206, second adhesive film; 300, cover plate; 400, optical adhesive layer; 501, first wall; 502, second wall; 503, first filling part; 504, second filling part; 600, bonding layer.

[0030] DETAILED DESCRIPTION

[0031] ​The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood that the embodiments are only used to explain the technical principles of the present application, and are not used to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed in order to adapt to specific application occasions.

[0032] It should be noted that, in the description of the present application, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer" and the like are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the related devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the ordinal numbers "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, it should also be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0034] Referring to Figure 1 Taking a mobile phone as an example, specifically, Figure 1 is a top view of the display device, Figure 2 is a longitudinal sectional view of the display device along Figure 1 A-A line, and B region is a partial schematic view of the B region in the longitudinal sectional view of the display device along A-A line, which is also the bottom region of the mobile phone. It should be noted that the "bezel" described in the present application refers to the distance between the edge of the display area (also referred to as AA area in the art) of the display module and the edge of the entire display device, and the "narrow bezel" design concept is to minimize the distance between the edge of the display area and the edge of the display device.

[0035] In Figure 2In the related art, a display device includes a housing 100, a display module 200, and a cover plate 300. The display module 200 includes a flexible circuit board 201. The cover plate 300 is connected to the display module 200 through an optical adhesive layer 400. In order to ensure the sealing connection between the edge of the cover plate 300 and the housing 100, a protruding portion 11 is fixedly arranged on the side plate of the housing 1. The protruding portion 11 is provided with an adhesive layer 12. The edge of the cover plate 300 is fixedly bonded to the protruding portion 11 through the adhesive layer 12, so as to fix the edge of the cover plate 300 and ensure the sealing of the interior space of the cover plate 300 and the housing 100. However, due to the existence of the protruding portion 11 and the adhesive layer 12, a certain width is occupied, which causes the distance W between the flexible circuit board 201 and the side wall of the housing 100 to be unable to be reduced to a smaller range. Therefore, it is difficult to significantly reduce the frame size of the display device by using the above-mentioned method.

[0036] With reference to Figure 3 , a longitudinal sectional view (i.e., a sectional view along the A-A line) of a display device according to an embodiment of the present application is shown. The display device includes a housing 100, a display module 200, a cover plate 300, and a filling structure arranged around the display module 200. Figure 1

[0037] The housing 100 is a support carrier of the entire display device, which includes a bottom plate 101 and a side plate 102 fixedly connected to the bottom plate 101. The bottom plate 101 and the side plate 102 form a containing space with an opening (for example, the opening faces upward in the state shown in the figure) therebetween. Figure 3 Optionally, the bottom plate 101 and the side plate 102 are in an integrated structure.

[0038] The display module 200 is located in the containing space. The cover plate 300 is connected to the front surface of the display module 200 and closes the opening, so as to define the display module 200 in the containing space. Optionally, an optical adhesive layer 400 is arranged between the cover plate 300 and the display module 200. In the description of the present application, the front surface of the display module 200 is the light-out surface of the display module 200. Correspondingly, the back surface of the display module 200 is the light-in surface of the display module.

[0039] With reference to Figure 3 and Figure 4 , wherein, Figure 4 ​To show the local schematic view of the display device near the flexible panel, in an embodiment of the present application, the display module 200 comprises a display panel 202 and a first back adhesive film 203, an SCF layer 204, a PET layer 205, and a second back adhesive film 206 which are sequentially stacked on the back of the display panel 202. The display panel 202 is the main display device, which has a display area and a peripheral area around the display area. The SCF (Super Clean Foam) layer mainly plays a buffering role, and the first back adhesive film 203, the PET layer 205, and the second back adhesive film 206 mainly play an adhesive role. The composition of the display module 200 is a known technology in the art, and will not be described here. It should be understood that the display module 200 is only an example of the present application, and the composition of the display module 200 is not limited to the above combination.

[0040] The display module 200 further comprises a flexible circuit board 201, which is bent from the front surface of the display module 200 to the back surface of the display module 200. Specifically, one end of the flexible circuit board 201 is connected to the binding area on the front surface of the display module 200, and the other end is connected to the circuit structure on the back surface of the display module 200. In some implementations, the flexible circuit board 201 further comprises an MCL layer (Metal Conductive Lacquer) disposed thereon to improve the structural strength and toughness of the flexible circuit board 201, thereby improving the bending resistance of the flexible circuit board.

[0041] The filling structure comprises a first enclosing wall 501, a second enclosing wall 502, a first filling part 503, and a second filling part 504. The first enclosing wall 501 extends from the cover plate 300 towards the bottom plate 101 at a position adjacent to the side plate 102. The second enclosing wall 502 is disposed opposite to the first enclosing wall 501 and extends from the back surface of the display module 200 towards the bottom plate 101. The second enclosing wall 502 and the first enclosing wall 501 define a filling area (indicated by the dashed line in the figure) therebetween. Figure 4 For example, the filling area is the area jointly defined by the first enclosing wall 501, the second enclosing wall 502, the cover plate 300, the optical adhesive layer 400, and the flexible circuit board 201.

[0042] In an embodiment of the present application, the width of the first enclosing wall 501 and the second enclosing wall 502 is 0.24-0.29 mm. The above width refers to the dimension in the extension direction of the bottom plate 101 or the cover plate 300. The height of the first enclosing wall 501 and the second enclosing wall 502 is less than the distance between the cover plate 300 and the bottom plate 101, so that the first enclosing wall 501 and the second enclosing wall 502 are both spaced apart from the bottom plate 101.

[0043] The first filling part 503 is located between the first enclosing wall 501 and the flexible circuit board 201, the first filling part 503 covers at least part of the flexible circuit board 201, and the first filling part 503 is fixedly connected with the cover plate 300, so that the first filling part 503 fixes the edge of the cover plate 300 and realizes the sealed connection between the cover plate 300 and the shell 100. It should be noted that in the above description, the first filling part 503 covers "at least part" of the flexible circuit board 201, which means that the first filling part 503 can wrap the entire flexible circuit board 201, or only wrap the area around the bent part. In other words, the present application does not limit the extension length of the first filling part 503 on the upper and lower sides of the display module 200. In an embodiment of the present application, the thickness of the first filling part 503 is set to be 0.2-0.3mm beyond the back of the display module 200 in the direction from the display module 200 to the bottom plate 101.

[0044] The second filling part 504 is also located in the filling area, and the second filling part 504 covers the surface of the first filling part 503 facing the bottom plate 101. Optionally, the second filling part 504 is flush with the end surface of the first enclosing wall 501 and the second enclosing wall 502 close to the bottom plate 101.

[0045] Referring to Figure 3 and Figure 4 , the filling structure formed by the first filling part 503, the second filling part 504, the first enclosing wall 501 and the second enclosing wall 502 is an annular structure formed along the circumference of the display module 200. It should be understood that the above-mentioned annular structure is not a "circular ring" in the strict sense, and the overall shape can be consistent with the shape of the display device. For example, generally speaking, the shape of a mobile phone, a tablet and the like is square, and correspondingly, the annular structure includes four straight segments connected end to end.

[0046] During use, the display device will inevitably fall to the ground. For example, in some scenarios, when the bottom of the display device (the end where the flexible circuit board is located) falls vertically downward, the impact force direction of the display device is as shown by the horizontal arrow in Figure 4 , when the back of the display device falls horizontally downward, the impact force direction of the display device is as shown by the vertical arrow in Figure 4 . In either case, the impact force will be transmitted to the display module 200 through the filling structure, which may cause damage to the circuit structure of the display module 200, separation of the filling structure and the cover plate 300, breakage of the display module 200, and the like.

[0047] Therefore, in some embodiments of the present application, the modulus of the parts of the filling structure is differentiated, the modulus of the first filling part 503 is greater than the modulus of the second filling part 504 and the modulus of the first wall 501, so that when the display device falls to the ground and is subjected to an impact force from the ground, the first filling part 503 and the first wall 501 will deform to absorb the impact energy and slow down the transmission of the force to the display module 200. The second filling part 504 has a greater modulus and a higher ability to resist deformation, which can protect the flexible circuit board 201 and the display module 200 and block the transmission of the impact force to the display module 200, thereby effectively protecting the display module 200 and the flexible circuit board 201.

[0048] The second wall 502 is used to form a filling area with the first wall 501, thereby facilitating the filling of the first filling part 503 and the second filling part 504. The second wall 502 mainly plays a blocking role, and considering that the second wall 502 is relatively thin, in some embodiments, the modulus of the second wall 502 is greater than the modulus of the second filling part 504 and the modulus of the first wall 501. Alternatively, in some embodiments, in order to reduce the transmission of the impact force to the display module 200 along the second wall 502, the modulus of the parts of the second wall 502 can also be differentiated, the second wall 502 is divided into a first subpart close to the display module 200 and a second subpart close to the bottom plate 101, the modulus of the first subpart is greater than the modulus of the second subpart, thereby absorbing impact energy through the second subpart and resisting deformation through the first subpart to protect the display module 200.

[0049] In some implementations of the present application, the hardness of the above-mentioned filling structure can also be limited, the hardness of the first filling part 503 is greater than the hardness of the second filling part 504 and the first wall 501, and the hardness of the second wall 502 is greater than the hardness of the second filling part 504 and the first wall 501. In this way, the first filling part 503 with higher hardness further improves its structural strength and better protects the display module 200, while the first wall 501 and the second filling part 504 with lower hardness can better absorb impact energy, thereby facilitating further improvement of the impact resistance of the display device.

[0050] In the processing of the display device, the cover plate 300 can be used as a base, the display module 200 is first bonded and fixed to the cover plate 300 through the optical adhesive layer 400, then the first enclosing wall 501 and the second enclosing wall 502 are formed in sequence by 3D printing based on the cover plate 300, then the first filling part 503 and the second filling part 504 are formed in sequence in the filling area formed by the first enclosing wall 501 and the second enclosing wall 502, and finally the shell 100 is bonded and fixed to the second filling part 504, so that the shell 100 wraps the display module 200 and the entire filling structure, and the display module 200 and the filling structure are enclosed in the space formed by the shell 100 and the cover plate 300.

[0051] The first enclosing wall 501, the second enclosing wall 502, the first filling part 503, and the second filling part 504 are all adhesive materials with adhesive properties. In the process of 3D printing the first enclosing wall 501, the second enclosing wall 502, the first filling part 503, and the second filling part 504, the first enclosing wall 501 and the first filling part 503 are both bonded and fixed to the cover plate 300, thereby ensuring the fit and sealing of the edge portion of the cover plate 300.

[0052] In some embodiments of the present application, the first enclosing wall 501 can be bonded and fixed to the side plate 102, and the second filling part 504 can be bonded and fixed to the bottom plate 101. Optionally, an adhesive layer 600 can also be provided between the second filling part 504 and the bottom plate 101, and after the second filling part 504 is solidified and formed, the second filling part 504 and the bottom plate 101 can be bonded and fixed through the adhesive layer 600.

[0053] For the performance of the adhesive material used in the first enclosing wall 501, the second enclosing wall 502, the first filling part 503, and the second filling part 504, in some embodiments of the present application, the modulus of the first enclosing wall 501 can be selected to be 40-90KPa, and the hardness can be selected to be 15A-25A. The modulus of the second enclosing wall 502 is greater than 2GPa, and the hardness can be selected to be 80D-95D. The first enclosing wall 501 and the second enclosing wall 502 can be formed by using light curing technology, and the viscosity of the adhesive material thereof is between 50000cps-3500000cps, the bonding strength of the first enclosing wall 501 and the ink area of the cover plate 300 is >13.5MPa, so as to ensure the bonding strength of the first enclosing wall 501 and the cover plate 300, and the bonding strength between the second enclosing wall 502 and the display module 200 is >7MPa. Optionally, the modulus of the first filling part 503 is greater than 2GPa, the hardness is 85D-95D, the viscosity of the adhesive material of the first filling part 503 is less than 200cps, and the bonding strength of the first filling part 503 and the ink area of the cover plate 300 is greater than 16MPa. The modulus of the second filling part 504 is 7MPa-12MPa, and the hardness is 15A-25A.

[0054] Of course, the above is only an exemplary description of the application based on the first wall 501, the second wall 502, the first filling part 503 and the second filling part 504. In actual applications, those skilled in the art can adjust the above parameters as needed.

[0055] As described above, by filling the first filling part 503, the second filling part 504 and the first wall 501 in the area between the shell 100, the display module 200 and the cover plate 300, the first wall 501 and the first filling part 503 are bonded and fixed with the cover plate 300 after filling and curing, thereby ensuring the fit and sealing of the cover plate 300. Based on the bonding and sealing between the first filling part 503, the second filling part 504 and the first wall 501 and the cover plate 300, compared with the prior art of setting a protruding part on the shell 100 to achieve the sealing connection of the cover plate 300, the overall structure formed by the first filling part 503, the second filling part 504 and the first wall 501 can be smaller in width, thereby further reducing the frame width of the display device and meeting the design concept of "narrow frame".

[0056] On the other hand, by distinguishing the modulus of the first filling part 503, the second filling part 504 and the first wall 501, the first filling part 503 is at a relatively high modulus, and the second filling part 504 and the first wall 501 are at a relatively low modulus. In this way, for the display device, the first wall 501 and the second filling part 504 in the peripheral area are mainly responsible for absorbing impact energy, and the first filling part 503 in the inner area is responsible for resisting impact force and protecting the display module 200. Therefore, by distinguishing the modulus of the above two areas, not only can the transmission of ground impact force to the display module 200 be delayed after the display device falls, but also the display module 200 can be effectively protected, thereby improving the impact resistance of the display device.

[0057] It should be noted that although the above embodiment is exemplarily described by taking the filling structure as a ring structure surrounding the display module 200, it does not constitute a limitation on the application. For example, in some other implementations, the filling structure can be provided only at the two opposite ends of the bottom and top of the display device, and no filling structure is provided at the two relatively long sides of the display device, or the filling structure can be provided only at the bottom of the display device, and the like. The adjustment of the specific structure and the setting position of the filling structure should be within the protection scope of the application.

[0058] The application also discloses a preparation method of the display device, which is described in detail with reference to the accompanying drawings. Figures 5-8 The preparation method of the display device is shown in the accompanying drawings, and the preparation method comprises the following steps.

[0059] S101: Fix the display module 200 on the cover plate 300.

[0060] Specifically, in step S101, the display module 200 can be fixedly connected with the cover plate 300 through an optical adhesive layer.

[0061] Next, referring to Figure 5 , steps S102 and S103 are performed.

[0062] S102: Form a first enclosing wall 501 extending towards the back of the display module 200 at the edge of the cover plate 300.

[0063] S103: Form a second enclosing wall 502 extending away from the back of the display module 200 at the back of the display module 200, so that the first enclosing wall 501 and the second enclosing wall 502 define a filling area.

[0064] Next, referring to Figure 6 , step S104 is performed.

[0065] S104: Form a first filling part 503 in the filling area, so that the first filling part 503 covers at least part of the flexible circuit board 201.

[0066] Of course, it should be noted that Figure 6 in the above description, the bottom area of the display device is exemplarily described, and in some embodiments, the first filling part 503 can also be filled along the circumference of the display module 200.

[0067] Next, referring to Figure 7 , step S105 is performed.

[0068] S105: Form a second filling part 504 in the filling area, so that the second filling part 504 covers the first filling part 503.

[0069] Finally, referring to Figure 8 , step S106 is performed.

[0070] S106: Install the shell 100, so that the display module 200, the first enclosing wall 501, the second enclosing wall 502, the first filling part 503 and the second filling part 504 are accommodated in the accommodation space formed by the shell 100 and the cover plate 300, the first enclosing wall 501 is close to the side plate 102, and the second filling part 504 is close to the bottom plate 101.

[0071] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will all fall within the protection scope of the present application.

Claims

1. A display device, characterized in that, include: A housing, comprising a base plate and a side plate connected to the base plate, wherein an accommodating space with an opening is formed between the base plate and the side plate; A display module is located in the accommodating space, the display module including a flexible circuit board that is bent from the front side of the display module to the back side of the display module; A cover plate that connects to the front of the display module and closes the opening; A first wall extends from the cover plate toward the base plate at a location adjacent to the side plate; A first filling portion is located between the first enclosure and the flexible circuit board. The first filling portion covers at least a portion of the flexible circuit board and is bonded and fixed to the cover plate. The second filling portion covers the surface of the first filling portion facing the base plate, and the modulus of the first filling portion is greater than the modulus of the second filling portion and the modulus of the first wall.

2. The display device according to claim 1, characterized in that, The display device further includes: A second enclosure wall extends from the back of the display module toward the base plate. The second enclosure wall is disposed opposite to the first enclosure wall. The first enclosure wall and the second enclosure wall define a filling area. The first filling part and the second filling part are located in the filling area.

3. The display device according to claim 2, characterized in that, The modulus of the second wall is greater than the modulus of the second filling part and the modulus of the first wall.

4. The display device according to claim 3, characterized in that, The second wall includes a first sub-section near the display module and a second sub-section near the base plate, wherein the modulus of the first sub-section is greater than that of the second sub-section.

5. The display device according to claim 2, characterized in that, The first wall is bonded and fixed to the side panel, and the second filling part is bonded and fixed to the bottom plate.

6. The display device according to claim 5, characterized in that, The display device further includes an adhesive layer located between the second filling portion and the base plate, the adhesive layer being used to bond and fix the second filling portion to the base plate.

7. The display device according to claim 2, characterized in that, Along the direction from the display module to the base plate, the first filling portion extends 0.2-0.3 mm beyond the back surface of the display module.

8. The display device according to claim 2, characterized in that, The width of the first wall and / or the second wall is 0.24-0.29 mm.

9. The display device according to claim 1, characterized in that, The hardness of the first filling part is greater than that of the second filling part and the first enclosure.

10. The display device according to any one of claims 2 to 8, characterized in that, The first filling portion, the second filling portion, the first enclosure wall, and the second enclosure wall form a ring structure around the display module in the circumferential direction.

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