Display module, display device and packaging method of display module

Abstract

The invention discloses a display module, a display device and a display module packaging method, and belongs to the technical field of display equipment. Not only can the bending part be prevented from being damaged, but also the narrow frame size requirement of the display device can be met. The display module comprises a protection structure, a display panel and a cover plate, in the stacking direction of the display panel and the cover plate, the two sides of the protection structure are connected with the cover plate and a middle frame of the display device respectively; the display panel comprises a display part, and a bending part and a connecting part which extend from the edge of the display part and are connected in sequence, and the bending part and the connecting part are located on the side, away from the cover plate, of the display part; the cover plate comprises a display area and a non-display area located on the periphery of the display area. The orthographic projection of the bending part on the cover plate is located in the non-display area, and the orthographic projection of the protection structure on the cover plate completely covers the orthographic projection of the bending part on the cover plate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of display devices, and particularly relates to a display module, a display device, and a packaging method of the display module. BACKGROUND

[0002] With the development of display technology, the requirement for the narrow frame size of a display device is increasingly high. The display device comprises a display panel, the display panel has a display part and a bending part located at one side of the display part, and the display panel is electrically connected to a circuit board through the bending part, so as to supply power to the display part for picture display. Since the bending part is close to the middle frame of the display device, the bending part is more likely to be damaged.

[0003] In related technologies, in order to avoid damage to the bending part, a safety space is reserved between the middle frame and the bending part, which results in a wider frame, which is contrary to the requirement for the narrow frame size of the display device. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a display module, a display device, and a packaging method of the display module, which can avoid damage to the bending part and meet the requirement for the narrow frame size of the display device.

[0005] In a first aspect, an embodiment of the present application provides a display module, comprising: a protective structure, and a display panel and a cover plate which are stacked; one side of the protective structure is fixedly connected to the cover plate along the stacking direction of the display panel and the cover plate. The display panel comprises a display part and a circuit connection plate extending from the edge of the display part, the circuit connection plate comprises a bending part connected to the display part and a connection part connected to the bending part, and the bending part and the connection part are located on the side of the display part away from the cover plate. The cover plate comprises a display area and a non-display area located at the periphery of the display area. The normal projection of the bending part on the cover plate is located in the non-display area. From any direction parallel to the main plane of the protective structure, the contour projection of the protective structure completely covers the contour projection of the bending part.

[0006] In some embodiments, the normal projection of the protective structure on the cover plate is located in the display area.

[0007] In some embodiments, along the length extension direction of the display part, the protective structure and the middle frame of the display device have a protective distance.

[0008] In some embodiments, the protective structure comprises a retaining wall portion arranged around the bending portion, and a filling portion arranged inside the retaining wall portion.

[0009] In some embodiments, the retaining wall portions are arranged on the cover plate and the display panel respectively.

[0010] In some embodiments, the retaining wall portion comprises at least one avoiding portion for providing assembly space for components of the display device.

[0011] In some embodiments, the retaining wall portion and the filling portion are formed of different materials.

[0012] In some embodiments, along the extension direction of the display portion, the protective structure has a protective width a, the retaining wall portion has a retaining wall width b, the end of the bending portion and the inner wall on both sides of the retaining wall portion have a first distance c and a second distance d respectively, and the outer wall on the side of the retaining wall portion away from the display portion has a third distance e from the end surface of the cover plate. wherein, , and .

[0013] In some embodiments, , and

[0014] In some embodiments, the first side of the protective structure is connected to the cover plate through a first fixing portion, and the second side of the protective structure is connected to the middle frame through a second fixing portion, wherein the first fixing portion and the second fixing portion are formed of different materials.

[0015] In a second aspect, the embodiments of the present application provide a display device, comprising a middle frame and the display module of the first aspect, wherein the display module is located on the inner side of the middle frame of the display device and is fixedly connected to the middle frame.

[0016] In a third aspect, the embodiments of the present application provide a packaging method of a display module, comprising: obtaining a target image of a display module to be packaged, wherein the display module to be packaged comprises a display panel and a cover plate arranged in layers, the display panel comprises a display portion, and a bending portion and a connecting portion connected in sequence are extended from the edge of the display portion, and the bending portion and the connecting portion are located on the side of the display portion away from the cover plate; generating a first dispensing path for forming a retaining wall portion based on the target image, and generating a second dispensing path for forming a filling portion based on the target image, wherein the retaining wall portion surrounds the bending portion, and the filling portion is arranged inside the retaining wall portion. performing a first dispensing operation on the display module to be packaged according to the first dispensing path to form the dam portion; performing a second dispensing operation on the display module to be packaged according to the second dispensing path to form the filling portion, and thereby forming the display module according to the first aspect.

[0017] In some embodiments, the second dispensing operation on the display module to be packaged according to the second dispensing path to form the filling portion specifically includes: injecting a first predetermined amount of glue into the dam portion at a first flow rate; stopping dispensing and maintaining for a first predetermined time to allow bubbles in the first predetermined amount of glue to escape; continuing to inject a second predetermined amount of glue into the dam portion at a second flow rate to form the filling portion.

[0018] The display module of the present application includes a protective structure and a display panel and a cover plate arranged in a stack, and the two sides of the protective structure are connected with the cover plate and the middle frame of the display device respectively. The display panel includes a display portion, a bending portion and a connecting portion, and the cover plate includes a display area and a non-display area located at the periphery of the display area. The orthographic projection of the bending portion on the cover plate is located in the non-display area, and the orthographic projection of the protective structure on the cover plate completely covers the orthographic projection of the bending portion on the cover plate. In this way, the protective structure completely covers the bending portion, and when the middle frame is impacted, the protective structure can play a buffering role to protect the bending portion, so that a safety space does not need to be reserved between the middle frame and the bending portion, thereby achieving the effect of avoiding damage to the bending portion and meeting the requirement of narrow frame size of the display device. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which: Figure 1 is a schematic front view of a display device provided by the related art; Figure 2 is a schematic front view of a display device provided by the related art; Figure 1 is an A-A sectional view of the display device in Figure 3 is a schematic structure enlarged view of a display device provided by the present application; Figure 4 is a B-B sectional view of the display device in Figure 3 Figure 5 is a schematic view of a display device before packaging provided by the present application; Figure 6 is a schematic view of a display device in a packaging process provided by the present application; Figure 7 ​is a schematic diagram of a packaged display device provided by an embodiment of the present application; Figure 8 is a schematic diagram of size division of a packaging structure provided by an embodiment of the present application; Figure 9 is Figure 3 is an enlarged view of the C region in Figure 10 is a sectional view of another display device provided by an embodiment of the present application; Figure 11 is a schematic diagram of a packaging method flow of a display module provided by an embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to better understand the technical solutions provided by the embodiments of the present application, the technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present application and the embodiments are detailed descriptions of the technical solutions of the embodiments of the present application, and are not limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0021] In this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, inclusion of the term "comprises" does not exclude the presence of additional elements in the process, method, article, or apparatus that includes the elements listed. The term "two or more" includes two or more than two.

[0022] Referring to Figure 1 , the display device includes a display module 1000 and a device housing.

[0023] The display device described above can be any device that displays images whether in motion (e.g., video) or stationary (e.g., still images), and whether textual or pictorial. More particularly, it is contemplated that the embodiments can be implemented in or in association with a variety of electronic devices, such as, but not limited to, mobile telephones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 players, camcorders, game consoles, wrist watches, clocks, calculators, television monitors, flat panel displays, computer monitors, auto displays (e.g., odometer display, etc.), cockpit controls and / or displays, display of camera views (e.g., in a vehicle), electronic photographs, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures (e.g., display of images on a piece of jewelry) and the like.

[0024] Figure 2 For Figure 1 the display device in the display module 1000 along the section line A A partial sectional view of the display device.

[0025] Referring to Figure 2 , the display module 1000 includes a display panel 1001 and a driving chip (not shown in the figure), and the device housing includes a middle frame 1002, and the display module 1000 is located on the inner side of the middle frame 1002. The display panel 1001 can be a flexible display panel. The flexible display panel refers to a display panel that can be bent. For example, the flexible display panel can be a display panel including an organic electroluminescent device (OLED). In the display device of the present application, a plastic chip (COP) screen packaging process can be performed on the flexible display panel to improve the proportion of the display area in the display device. The COP screen packaging process refers to a packaging process in which a part of the flexible display panel is bent directly to realize the connection between the flexible display panel and the driving chip located on the non-display surface of the flexible display panel.

[0026] As Figure 2 shown, the display panel 1001 includes a display part 1001A and a bending part 1001B and a connecting part 1001C connected in sequence on one side of the display part 1001A, and the driving chip is located on the side of the display panel 1001 away from the display surface. The display panel 1001 is bent to the side away from the display surface by bending the bending part 1001B, so that the connecting part 1001C and the driving chip located on the non-display surface of the display panel 1001 are electrically connected. In this way, by bending the display panel 1001 once, the frame of the display module can be reduced, and the narrow frame design of the display module is realized.

[0027] However, since the bending part 1001B is close to the middle frame 1002 of the display device, the bending part 1001B of the display panel 1001 is relatively fragile. When the display device falls, the middle frame 1002 may be deformed to press the bending part 1001B of the display panel 1001, causing damage to the bending part 1001B, and further causing damage to the display module 1001. As shown in Figure 2 To avoid damage to the bending part 1001B, a safety space L1 can be reserved between the middle frame 1002 and the bending part 1001B, so that even if the middle frame 1002 is deformed, the bending part 1001B is not easily damaged. In addition, space for filling and fixing the adhesive 1003 needs to be reserved for the cover plate and the middle frame. Figure 2 The division of the non-display area N2 and the display area N1 in the display device 1000 is determined by the position of the display part 1001A. This is because the display part 1001A is used to display a picture, and the picture displayed by the display part 1001A can be displayed through the cover plate 1004. Therefore, the orthographic projection area of the display part 1001A on the cover plate 1004 is the display area N1. The area on the cover plate 1004 that does not transmit the picture is the non-display area N2. The non-display area N2 is the black border area As shown in Figure 2 The space occupied by the fixing adhesive 1003 and the safety space L1 will cause the black border area N2 to widen, thereby causing the frame to widen, which is contrary to the narrow frame size requirement of the display device.

[0028] The display module, the display device and the display module packaging method provided by the embodiments of the present application can not only avoid damage to the bending part, but also meet the narrow frame size requirement of the display device.

[0029] Referring to Figure 3 and Figure 4 , the display module 20 includes a protection structure 201 and a display panel 202 and a cover plate 203 arranged in layers.

[0030] The display panel 202 mainly includes a display part 2021 and a circuit connection plate extending from the edge of the display part 2021, and the circuit connection plate includes a bending part 2022 and a connection part 2023 connected in sequence. The display part 2021 is a screen visible area, and the display part 2021 is provided with a matrix arranged pixel unit for realizing image display. The bending part 2022 is a flexible circuit area, which is arranged adjacent to the display part 2021. The connection part 2023 is provided with a binding pad for connecting a driving chip or a flexible circuit board 204 to receive a driving signal. The bending part 2022 and the connection part 2023 are both located on the non-display side of the display part 2021.

[0031] The structure design enables the connection portion 2023 and the partial bending portion 2022 to be bent and attached to the non-display side (i.e., the back side) of the display panel, thereby hiding the connection portion 2023 and the bound flexible circuit board 204 behind the panel, and realizing the visual effect of narrow frame or full screen.

[0032] The display panel 202 can further include a control portion 2024 located between the display portion 2021 and the connection portion 2023, and internally integrating control circuit, wire and electrostatic discharge circuit, etc., and being responsible for the control of display driving.

[0033] The display portion 2021 has opposite display surface p1 and non-display surface p2, and the display surface p1 is used for image presentation. The bending portion 2022, the connection portion 2023 and the display portion 2021 can be integrally formed, and together constitute the main structure of the flexible display panel.

[0034] Continuing to refer to Figure 4 , along the stacking direction (Z direction in the figure) of the display panel 202 and the cover plate 203, the two sides of the protection structure 201 are connected with the cover plate 203 and the middle frame 10 of the display device, respectively. The cover plate 203 includes a display area M1 and a non-display area M2 located at the periphery of the display area M1. The orthographic projection of the bending portion 2022 on the cover plate 203 is located in the non-display area M2, and the orthographic projection of the protection structure 201 on the cover plate 203 completely covers the orthographic projection of the bending portion 2022 on the cover plate 203. It should be noted that the division of the non-display area M2 and the display area M1 is determined by the position of the display portion 2021. This is because the display portion 2021 is used for displaying pictures, and the pictures displayed by the display portion 2021 can be displayed through the cover plate 203. Therefore, the orthographic projection area of the display portion 2021 on the cover plate 203 is the display area M1. The area of the cover plate 203 that does not transmit the picture is the non-display area M2. The non-display area M2 is the black border area, and the narrow frame design is the design of reducing the black border area.

[0035] In the display module of the embodiment of the present application, the orthographic projection of the bending portion 2022 on the cover plate 203 is located in the non-display area M2, and from any direction parallel to the main plane of the protection structure 201, the contour projection of the protection structure 201 completely covers the contour projection of the bending portion 2022. Here, the main plane of the protection structure 201 can include all the surfaces of the protection structure 201 that can form a plane and are exposed. For example, Figure 4 The protection structure 201 in the above embodiment is in a cuboid state, and at this time, the main plane of the protection structure 201 can include the six faces of the cuboid. From any direction parallel to the six faces, the contour projection of the protection structure 201 completely covers the contour projection of the bending portion 2022.

[0036] In this way, the protective structure 201 can completely cover the bent portion 2022 to protect it. This coverage includes not only the outer surface of the bent portion 2022 but also its inner surface. When the display device is dropped, the deformed frame 10 may exert pressure on the bent portion 2022 of the display panel 202. The protective structure 201 can support the deformed frame 10, thus cushioning the pressure and preventing damage to the bent portion 2022 from the impact of the drop.

[0037] like Figure 4 As shown, in the display module of this application embodiment, since the protective structure 201 completely covers the bent portion 2022, it can provide buffer protection for the bent portion 2022. Therefore, it is no longer necessary to set a gap between the bent portion 2022 and the middle frame 10. Figure 2 The safety space L1 is shown. Without the safety space L1, the bent portion 2022 can move closer to the middle frame 10, thus reducing the distance between the bent portion 2022 and the middle frame 10. Additionally, with... Figure 2 Compared to the structure shown, this application can connect the cover plate 203 and the middle frame 10 through the protective structure 201, and the protective structure can be set on the bending part 2022, thus saving the space occupied by the separate fixing glue (even if fixing glue is needed, the fixing part is located below the protective structure 201, which does not affect the reduction of the distance between the bending part 2022 and the middle frame 10), so that the distance between the bending part 2022 and the middle frame 10 is further reduced.

[0038] After the distance between the bent portion 2022 and the middle frame 10 is reduced, the distance between the display portion 2021 and the middle frame 10 is also reduced accordingly, which reduces the non-display area M2 of the cover plate 203, thereby reducing the black border distance and achieving the narrow bezel size requirement of the display device.

[0039] Furthermore, since the protective structure 201 completely covers the bent portion 2022, and both sides of the protective structure 201 are connected to the cover plate 203 and the middle frame 10 respectively, foreign objects (dust, moisture, etc.) from the external environment can be prevented from adhering to the bent portion 2022, and foreign objects can also be prevented from entering the gap between the bent portion 2022 and the cover plate 203, thereby preventing display malfunction of the display panel 202. Thus, the protective structure 201 of this embodiment can also provide dust and water protection for the bent portion 2022 of the display panel 202.

[0040] In some embodiments, the orthographic projection of the protective structure 201 onto the cover plate 203 is located in the display area M1. That is, provided that the device installation requirements and practical requirements are met, the protective structure 201 can extend to the display part 2021 and the connecting part 2023, thereby also providing protection for the display part 2021 and the connecting part 2023.

[0041] In some implementations, such as Figure 4 As shown, a protective distance L2 exists between the protective structure 201 and the middle frame 10 along the length of the display section 2021. Thus, when the middle frame 10 is subjected to an impact force, the protective distance can first protect the protective structure 201 from damage, thereby further protecting the bent portion 2022. This protective distance can be set relatively small to balance protection requirements and narrow bezel design requirements.

[0042] In some implementations, such as Figure 7 As shown, the protective structure 201 includes a retaining wall portion 2011 surrounding the bent portion 2022 and a filling portion 2012 surrounded by the retaining wall portion 2011. The protective structure 201 of this embodiment is formed by first applying adhesive around the bent portion 2022 to form a retaining wall, thus forming the retaining wall portion 2011. Then, adhesive is filled into the retaining wall portion 2011, flowing and filling both the outside and inside of the bend in the bent portion 2022, and filling the entire bend space formed inside the bent portion 2022, thereby forming the filling portion 2012 within the retaining wall portion 2011. Finally, the retaining wall portion 2011 and the filling portion 2012 together constitute the protective structure 201.

[0043] This encapsulation method is a localized additive reinforcement technique, involving the precise application of adhesive around and above the assembled component to form a protective structure. The encapsulation adheres to the component and substrate surfaces through the adhesive's bonding strength; the structural strength comes from the adhesive's inherent strength and toughness, as well as the bonding area. This method allows for flexible selection of the dispensing area and shape, making it ideal for irregular structures and localized reinforcement. Furthermore, its high flexibility allows for adjustments to the dispensing path and amount, making it ideal for reinforcing localized stress points, such as the corners of large BGA (Ball Grid Array Package) chips.

[0044] The protective structure 201 is formed by first applying adhesive around the bend 2022 (BANK application). Specifically, high-viscosity adhesive is used to apply adhesive to the areas requiring shaping or protection, forming a barrier (such as...). Figure 6As shown, the glue is then cured by UV lamp irradiation or temperature to form a solid retaining wall as a cavity for containing the internal glue. Since one side of the retaining wall portion 2011 is formed by dispensing glue on the display panel 202, in order to ensure that one side of the finally formed retaining wall portion 2011 is flush, semi-circular dam dispensing (by stacking layers of glue) can be first performed on the cover plate 203, and then full-circle dam dispensing (also by stacking layers of glue) can be started layer by layer upwards.

[0045] Then filling dispensing (Filling dispensing) is performed. Specifically, glue with low viscosity and good fluidity is poured into the dam cavity to fill the cavity inside the retaining wall with glue. After that, it is cured by UV lamp irradiation or temperature to form a solid filling portion structure. Finally, the retaining wall portion 2011 and the filling portion 2012 form a protective structure that wraps the bending portion 2022 inside and plays a protective role.

[0046] In some embodiments, as Figure 9 shown, the retaining wall portion 2011 includes at least one avoidance portion 2011a, and the avoidance portion 2011a is used to provide an assembly space for components of the display device. That is to say, the outer contour of the orthographic projection of the retaining wall portion 2011 on the cover plate 203 can be in an irregular shape, rather than necessarily a regular shape such as a square or a circle. In this way, the retaining wall portion 2011 can avoid other components, such as avoiding connectors or screw posts on the display module, etc., to avoid interference between components during assembly, thereby avoiding product defects caused by interference.

[0047] In some embodiments, the retaining wall portion 2011 and the filling portion 2012 can be formed by dispensing different materials. Specifically, the retaining wall portion 2011 can use glue with high viscosity and good shaping ability, such as high-viscosity epoxy resin, UV-curable glue, etc.; the filling portion 2012 can use glue with low viscosity and good fluidity, which can ensure complete filling of the gap and ensure that the surface of the filling portion 2012 is smooth and flat. For example, low-viscosity epoxy resin, polyurethane potting glue, etc. can be used.

[0048] In some embodiments, as Figure 8 shown, along the length extension direction of the display portion 2021, the protective structure 201 has a protective width a, the retaining wall portion 2011 has a retaining wall width b, the ends of the bending portion 2022 have a first distance c and a second distance d from the inner walls on both sides of the retaining wall portion 2011 respectively, and the outer wall of the retaining wall portion 2011 away from the display portion 2021 has a third distance e from the end face of the cover plate 203; wherein, a = b + c + d + e, and 1.5 mm < a < 2.5 mm, which can enhance the bonding force between the entire protective structure 201 and other devices and improve the protective performance of the protective structure 201.

[0049] Specifically, the size design can be that the size of the widest region of the retaining wall portion 2011 and the size of the narrowest region of the retaining wall portion 2011 differ by no more than 30%, so that the poor flatness caused by inconsistent shrinkage of the glue on both sides can be avoided.

[0050] The minimum size e of the retaining wall portion 2011 from the edge of the cover plate 203 is 50 μm ± 50 μm (the size is determined by equipment tolerance). The glue width (retaining wall width b) of the retaining wall portion 2011 is 100 μm ~ 200 μm, wherein the greater the retaining wall width b, the better the stability of the retaining wall portion 2011.

[0051] The first distance c between the end of the bending portion 2022 and the inner wall of one side of the retaining wall portion 2011 (wherein the radius of the bending portion 2022 is included). The minimum size of the second distance d between the end of the bending portion 2022 and the inner wall of the other side of the retaining wall portion 2011 is 50 μm, so that the air trapping problem and the glue overflow problem can be reduced.

[0052] In some embodiments, as shown in Figure 10 The first side of the protection structure 201 is connected with the cover plate 203 through the first fixing portion 205a, and the second side of the protection structure 201 is connected with the middle frame 10 through the second fixing portion 205b, wherein the first fixing portion 205a and the second fixing portion 205b are formed of different materials.

[0053] The cover plate 203 (usually a brittle high-hardness material such as glass) and the middle frame 10 (usually a metal such as aluminum alloy, or an engineering plastic) are two materials that are completely different in surface energy, roughness, thermal expansion coefficient, and chemical properties. It is difficult to use the same kind of adhesive to achieve optimal bonding strength on both sides. Specifically, the first fixing portion 205a can be selected to use an adhesive with strong affinity to the glass surface and high modulus. The second fixing portion 205b can be selected to use an adhesive with strong adhesion to the metal or plastic surface. In this way, the bonding interfaces on both sides of the protection structure 201 can form their own optimal chemical bonding and physical anchoring, thereby achieving optimal connection strength and reliability as a whole.

[0054] In addition, the first fixing portion 205a connected to the cover plate 203 can be relatively hard to match the low deformation characteristics of the cover plate 203. The second fixing portion 205b connected to the middle frame 10 can be relatively soft and elastic to absorb the deformation of the middle frame 10 caused by external force or thermal expansion and contraction.

[0055] As shown in Figure 11 The packaging method of the display module is used to form the display module in the above embodiments, and the packaging method of the display module comprises the following steps: In step S101, a target image of a display module to be encapsulated is acquired, wherein the display module to be encapsulated comprises a display panel and a cover plate which are stacked, the display panel comprises a display part, and a bending part and a connecting part which are sequentially connected and extend from an edge of the display part are located on a side of the display part away from the cover plate; As shown in Figure 5 The display module to be encapsulated is stacked on the cover plate 203, and the display part 2021 of the display panel 202 faces the cover plate 203, and the connecting part 2023 of the display panel 202 is away from the cover plate 203, and the bending part 2022 connects the display part 2021 and the connecting part 2023. An industrial camera can be used to capture the target image of the display module to be encapsulated, and the target image is sent to a controller which is electrically connected with the dispensing device.

[0056] In step S102, a first dispensing path for forming a retaining wall part 2011 surrounding the bending part 2022 is generated based on the target image, and a second dispensing path for forming a filling part 2012 surrounded by the retaining wall part 2011 is generated based on the target image. The target image collected clearly contains the contour information of the bending part and the surrounding area. The first dispensing path is generated based on the contour of the bending part, so the outer edge of the bending part in the target image can be identified and extracted first.

[0057] The first dispensing path is not directly drawn on the edge of the bending part, but is a closed loop formed by offsetting outward from the edge of the bending part by a predetermined safety distance. The setting of the safety distance needs to ensure that the retaining wall part 2011 formed can completely surround and cover the side wing of the bending part, so as to prevent the subsequent filled glue from leaking from any position of the retaining wall part 2011. The setting of the safety distance also needs to avoid stress concentration, so as to prevent the dispensing needle from directly contacting the fragile bending part and causing damage to the bending part. The first dispensing path can also be a continuous closed path without breakpoints, which is to ensure that the retaining wall part 2011 formed is a complete fence with excellent sealing performance, which can effectively limit the subsequent filling part to a predetermined area. The generation area of the second dispensing path is inside the closed area defined by the first dispensing path.

[0058] The second dispensing path can adopt a zigzag path, which can continuously and uniformly dispense in the area, ensure uniform distribution of glue, reduce the generation of bubbles, and improve the dispensing efficiency. It can also be filled spirally from the boundary to the inside or from the inside to the boundary, which can improve the flow leveling property. The second dispensing path and the first dispensing path can maintain a small internal spacing at the beginning, which can prevent the glue of the filling part and the glue of the retaining wall part from prematurely and excessively merging in the initial stage, thereby avoiding the destruction of the retaining wall shape due to flow leveling pressure. In the subsequent curing process, the two will naturally flow and merge into one whole, forming a dense encapsulation structure.

[0059] At step S103, the first dispensing operation is performed on the display module to be packaged according to the first dispensing path, so as to form the barrier wall part 2011. The first dispensing operation can be performed in a spiral dispensing manner, so that the barrier wall part is formed in a circle by circle manner. The first glue used to form the barrier wall part generally has high viscosity and / or thixotropy. Such rheological properties enable the glue to maintain a preset shape after being extruded, and is not prone to flow and collapse, so as to quickly form a three-dimensional "wall" structure with sufficient height.

[0060] The first dispensing operation can be performed at a relatively slow speed, so as to ensure that the glue line is continuous and stable, without stringing or breaking. The glue discharge pressure can be accurately matched with the glue viscosity and the dispensing speed, so as to ensure that the glue amount per unit length is consistent.

[0061] At step S104, the second dispensing operation is performed on the display module to be packaged according to the second dispensing path, so as to form the filling part, and to form the display module of the above-mentioned embodiments.

[0062] The second glue used to form the filling part can have relatively low viscosity. This is beneficial to the rapid flow and leveling of the glue in the area surrounded by the barrier wall part 2011, filling the entire space and effectively discharging the internal bubbles.

[0063] In some embodiments, the glue used in the first dispensing operation and the glue used in the second dispensing operation can be the same glue, and different effects of constructing a high-shaped barrier wall first and then realizing rapid flow and filling can be achieved by accurately controlling the dispensing parameters (such as speed and pressure). In other embodiments, the two glues can also be different in nature, so as to achieve optimal comprehensive performance (such as high support performance of the barrier wall and low stress and high light transmittance of the filling part).

[0064] The second dispensing operation can be performed at a faster speed than the first dispensing operation, so as to improve the production efficiency. After the dispensing is completed, the glue of the filling part 2012 is in contact with the glue of the barrier wall part 2011. Due to the surface tension and gravity, the two glues are fused with each other at the interface. Finally, in the subsequent curing (such as thermal curing or ultraviolet curing) process, the barrier wall part and the filling part are fused into one, to form a complete packaging protection layer with no interface inside, dense structure and uniform stress. Such a "step-by-step forming and one-piece curing" process not only ensures the sealing reliability of the edge area, but also realizes the efficiency and uniformity of large-area filling.

[0065] This packaging method belongs to local additive reinforcement, which is to accurately coat glue around and above the assembled components to form a protective structure. This packaging method encapsulates components by adhering to the component and substrate surface through glue, and the structural strength comes from the strength and toughness of the glue itself and the bonding area. This packaging method can flexibly select the dispensing area and shape, and is very suitable for special-shaped structures and local reinforcement. Moreover, this packaging method has high flexibility, and the dispensing path and amount can be adjusted at any time, which is very suitable for strengthening local stress points, such as dispensing and packaging reinforcement for the corners of large BGA (Ball Grid Array Package, Ball Grid Array Package) chips.

[0066] In some embodiments, the second dispensing operation is performed on the display module to be packaged according to the second dispensing path, and the filling part is formed, specifically comprising: A first predetermined amount of glue is injected into the dam wall part 2011 at a first flow rate; the main purpose of this step is to perform preliminary filling and substrate padding. The first flow rate is set to a relatively slow flow rate. A lower flow rate can minimize the turbulence and splashing of the glue when it impacts the substrate or the formed dam wall part. Severe turbulence can entrain air into the glue, forming small air bubbles that are difficult to remove. By slow and smooth injection, the glue can naturally flow flat in a laminar flow, covering the bottom of the area surrounded by the dam wall part, providing a bubble-free and flat substrate for subsequent glue injection.

[0067] Stop dispensing and maintain for a first predetermined time to allow bubbles in the first predetermined amount of glue to escape; this step is the core of the entire bubble elimination process, and its core purpose is to provide a static bubble elimination window. In the first injected glue, even if a large amount of bubbles is avoided by low-speed injection, a small amount of micro-bubbles or air dissolved in the glue may still remain. During the static period after stopping dispensing, these micro-bubbles will naturally and slowly migrate to the surface of the glue and eventually break and escape due to the viscosity of the glue and its own buoyancy. This static stage also provides valuable flow leveling and stress relaxation time for the glue. The surface tension of the glue will make it more flat, and the internal shear stress generated during the injection process will be released, which helps to form a higher quality internal structure.

[0068] The second predetermined amount of the gel is continuously injected into the dam portion at a second flow rate to form the filling portion. After the first step of laying down and the second step of standing still to remove bubbles, the gel base is relatively stable and free of bubbles. At this time, a relatively fast (higher than the first flow rate) second flow rate can be used for filling. Since the bottom layer of gel has occupied most of the space and wetted the substrate, the risk of turbulence and air entrainment during subsequent gel injection is greatly reduced. Therefore, the dispensing speed can be safely increased, significantly improving production efficiency without introducing new bubbles, until the final filling portion is formed.

[0069] The dispensing process of the present embodiment sets a "pause period" to provide the physically necessary time for bubbles to escape, thereby significantly reducing microbubbles and macrobubbles inside the encapsulated gel, and improving the density and uniformity of the entire encapsulation structure. In addition, bubbles are weak points in the encapsulation structure, which can accelerate the aging of the gel and possibly generate additional internal stress due to gas expansion / contraction during thermal cycling, leading to cracking of the gel layer or peeling off from the substrate. The dispensing process of the present embodiment fundamentally eliminates this hidden danger, making the encapsulation structure more resistant to long-term environmental and mechanical stress, thereby significantly improving the long-term use reliability and life of the display module.

[0070] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0071] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

[0072] Although the preferred embodiments of the present specification have been described, those skilled in the art can make additional changes and modifications to these embodiments once they understand the basic creative concept. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the present specification.

[0073] Obviously, those skilled in the art can make various modifications and variations to the present specification without departing from the spirit and scope of the present specification. Thus, if these modifications and variations of the present specification fall within the scope of the claims of the present specification and their equivalents, the present specification also intends to include these modifications and variations.

Claims

1. A display module, characterized in that, The invention is applied to a display device and includes: a protective structure and a stacked display panel and a cover plate; one side of the protective structure is fixedly connected to the cover plate along the stacking direction of the display panel and the cover plate; The display panel includes a display section and a circuit connection plate extending from the edge of the display section. The circuit connection plate includes a bent section connected to the display section and a connecting section connected to the bent section. The bent section and the connecting section are located on the side of the display section away from the cover plate. The cover plate includes a display area and a non-display area located around the display area; The orthographic projection of the bent portion on the cover plate is located in the non-display area; When projected from any direction parallel to the main plane of the protective structure, the outline projection of the protective structure completely covers the outline projection of the bent portion.

2. The display module according to claim 1, characterized in that, The protective structure's orthographic projection on the cover plate is located in the display area.

3. The display module according to claim 1, characterized in that, Along the length of the display section, there is a protective distance between the protective structure and the middle frame of the display device.

4. The display module according to claim 1, characterized in that, The protective structure includes a retaining wall portion surrounding the bend and a filling portion enclosing the interior of the retaining wall portion.

5. The display module according to claim 4, characterized in that, The retaining wall is respectively installed on the cover plate and the display panel.

6. The display module according to claim 4, characterized in that, The retaining wall includes at least one clearance portion, which provides assembly space for components of the display device.

7. The display module according to claim 4, characterized in that, The retaining wall and the filling part are formed of different materials.

8. The display module according to claim 4, characterized in that, Along the extending direction of the display section, the protective structure has a protective width a, the retaining wall section has a retaining wall width b, the end of the bent section has a first distance c and a second distance d with the inner walls on both sides of the retaining wall section respectively, and the outer wall of the retaining wall section away from the display section has a third distance e with the end face of the cover plate; in, ,and .

9. The display module according to claim 8, characterized in that, and .

10. The display module according to any one of claims 1 to 9, characterized in that, The first side of the protective structure is connected to the cover plate via a first fixing part; the second side of the protective structure is connected to the middle frame of the display device via a second fixing part; wherein the first fixing part and the second fixing part are formed of different materials.

11. A display device, characterized in that, The display device includes: a middle frame and a display module as described in any one of claims 1 to 10, wherein the display module is located inside the middle frame, and the other side of the protective structure is fixedly connected to the middle frame.

12. A method for packaging a display module, characterized in that, The packaging method for the display module includes: Obtain a target image of a display module to be packaged, wherein the display module to be packaged includes a display panel and a cover plate stacked together, the display panel includes a display part, and a bent part and a connecting part extending from the edge of the display part and connected in sequence, the bent part and the connecting part being located on the side of the display part away from the cover plate; A first adhesive dispensing path for forming a retaining wall portion is generated based on the target image, and a second adhesive dispensing path for forming a filling portion is generated based on the target image, wherein the retaining wall portion surrounds the bending portion, and the filling portion is surrounded by the retaining wall portion; The first dispensing operation is performed on the display module to be packaged according to the first dispensing path to form the barrier portion; A second dispensing operation is performed on the display module to be packaged according to the second dispensing path to form the filling portion and to form the display module as described in any one of claims 1 to 10.

13. The packaging method for a display module according to claim 12, characterized in that, A second dispensing operation is performed on the display module to be packaged according to the second dispensing path to form the filling portion, specifically including: A first predetermined amount of colloid is injected into the retaining wall at a first flow rate; Stop dispensing and maintain for a first predetermined time to allow air bubbles in the first predetermined amount of adhesive to escape; A second predetermined amount of colloid is injected into the retaining wall portion at a second flow rate to form the filling portion.

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