Display module, manufacturing method of display module and display equipment

Abstract

The invention provides a display module, a manufacturing method of the display module and display equipment, the display module comprises a display area and a frame area, the display module further comprises a display panel, and at least one side of the display panel is provided with a bending area located at the frame area; the optical adhesive layer and the cover plate layer are sequentially stacked on the light emitting side of the display panel; the protective adhesive layer is arranged on one side, far away from the display area, of the bending area; the first filling adhesive layer is arranged in the frame area where the bending area is located, and the first filling adhesive layer at least covers the protective adhesive layer and fills gaps among the protective adhesive layer, the optical adhesive layer and the cover plate layer; the frame area at the bending area comprises a first edge close to the display area and a second edge far away from the display area; the orthographic projection of the first filling adhesive layer on the cover plate layer covers the orthographic projection of the first edge on the cover plate layer and / or covers the orthographic projection of the second edge on the cover plate layer. The display module can reduce the width of the frame at the bending area and improve the bonding strength of the frame at the bending area.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display module, a method for manufacturing a display module, and a display device. Background Art

[0002] With the rapid development of the OLED (Organic Light-Emitting Diode) display industry, a large number of new display devices have gradually entered the market, and the form of OLED display products has gradually changed from rigid to flexible. In order to obtain a larger screen-to-body ratio and provide a better visual experience, the narrow-frame ultra-thin module (MDL) design has become a new development trend, which can be achieved through chip on flex (COF) and pad bending technology.

[0003] However, narrow bezels also bring the risk of low reliability. For example, one problem with current MDL products is that the connection strength between the bezel located at the bending or folding area (referred to as the lower bezel) and the MDL product is low, which cannot well protect the bending area of ​​the lower bezel and cannot meet the product quality requirements. Summary of the invention

[0004] In view of the above problems, the present disclosure provides a display module, a method for manufacturing a display module and a display device, which can reduce the width of the frame at the bending area while increasing the bonding strength of the frame, thereby improving the quality and reliability of the display product.

[0005] In a first aspect, the present disclosure provides the following technical solution through an embodiment:

[0006] A display module comprises a display area and a frame area located on at least one side of the display area, and the display module further comprises:

[0007] A display panel, wherein at least one side of the display panel is provided with a bending area located at the frame area, and an end of the display panel away from the display area is bent to the backlight side of the display module through the bending area;

[0008] An optical adhesive layer and a cover plate layer are sequentially stacked on the light-emitting side of the display panel;

[0009] A protective adhesive layer, disposed on a side of the bending area away from the display area;

[0010] A first filling adhesive layer is arranged in the border area where the bending area is located, the first filling adhesive layer at least covers the protective adhesive layer and fills the gap between the protective adhesive layer, the optical adhesive layer and the cover layer; the border area at the bending area includes a first edge close to the display area and a second edge away from the display area; the orthographic projection of the first filling adhesive layer on the cover layer covers the orthographic projection of the first edge on the cover layer, and / or covers the orthographic projection of the second edge on the cover layer.

[0011] In some embodiments, in a direction perpendicular to the cover layer, a side surface of the first filling adhesive layer is flush with an edge of the cover layer.

[0012] In some embodiments, the display module further includes a first retaining wall stacked on the display panel on the backlight side of the display module and overlapping the first edge.

[0013] In some embodiments, the viscosity of the first filling glue layer before curing is no higher than 2000 Pa·s.

[0014] In some embodiments, the first filling adhesive layer includes a first adhesive layer and a second adhesive layer, the first adhesive layer fills the gap, the second adhesive layer covers the protective adhesive layer outside the gap, and the viscosity of the adhesive liquid of the second adhesive layer before curing is higher than the viscosity of the adhesive liquid of the first adhesive layer before curing.

[0015] In some embodiments, the viscosity of the adhesive liquid of the first adhesive layer before curing is not higher than 2000 Pa·s, and the viscosity of the adhesive liquid of the second adhesive layer before curing is not lower than 1000000 Pa·s.

[0016] In some embodiments, the display module also includes a second retaining wall, which is arranged on the cover layer at the second edge, and the second retaining wall includes a first sub-retaining wall and a second sub-retaining wall stacked on the first sub-retaining wall. In the direction perpendicular to the cover layer, the height of the first sub-retaining wall is greater than the height of the gap, and the height difference is 5μm to 10μm; the height of the gap is the minimum height between the protective adhesive layer and the cover layer.

[0017] In some embodiments, the first filling glue layer has an inclined surface at the first edge.

[0018] In some embodiments, the display module further includes a middle frame, and the middle frame is disposed on a surface of the first filling glue layer away from the cover layer.

[0019] In some embodiments, the display module further includes a first back film layer, a heat dissipation layer, a support layer, and a second back film layer sequentially stacked on the backlight side of the display panel, and the second back film layer is disposed at the display panel located on the backlight side of the display module;

[0020] The display panel further includes a second filling adhesive layer, which is disposed in a gap between the display panel and the first back film layer, the heat dissipation layer, the support layer and the second back film layer.

[0021] In the second aspect, based on the same inventive concept, the present disclosure provides the following technical solution through an embodiment:

[0022] A method for manufacturing a display module, the display module comprising a display area and a frame area located on at least one side of the display area, the method comprising:

[0023] providing a display panel;

[0024] A stacked optical adhesive layer, a protective adhesive layer and a cover layer are formed on the display panel; wherein at least one side of the display panel is provided with a bending area located at the frame area, an end of the display panel away from the display area is bent to the backlight side of the display panel through the bending area, the optical adhesive layer and the cover layer are sequentially stacked on the light emitting side of the display panel, and the protective adhesive layer is arranged on a side of the bending area away from the display area;

[0025] A clamp is arranged on the backlight side of the display panel, wherein the clamp, the display panel, the protective adhesive layer, the optical adhesive layer and the cover layer form a receiving groove at the bending area;

[0026] Liquid glue is injected into the accommodating groove and solidified, and the clamp is removed to form a display module including a first filling glue layer; the first filling glue layer at least covers the protective glue layer and fills the gap between the protective glue layer, the optical glue layer and the cover layer; at the bending area, the border area includes a first edge close to the display area and a second edge away from the display area; the orthographic projection of the first filling glue layer on the cover layer covers the orthographic projection of the first edge on the cover layer and the orthographic projection of the second edge on the cover layer.

[0027] In the third aspect, based on the same inventive concept, the present disclosure provides the following technical solution through an embodiment:

[0028] A method for manufacturing a display module, the display module comprising a display area and a frame area located on at least one side of the display area, the method comprising:

[0029] providing a display panel;

[0030] A stacked optical adhesive layer, a protective adhesive layer, a cover plate layer and a first retaining wall are formed on the display panel; wherein at least one side of the display panel is provided with a bending area located at the frame area, an end of the display panel away from the display area is bent to the backlight side of the display panel through the bending area, the optical adhesive layer and the cover plate layer are sequentially stacked on the light emitting side of the display panel, the protective adhesive layer is arranged on the side of the bending area away from the display area; the first retaining wall is located on the backlight side of the display panel;

[0031] A clamp is arranged on the first retaining wall, and the clamp, the first retaining wall, the display panel, the protective adhesive layer, the optical adhesive layer and the cover layer form a receiving groove at the bending area;

[0032] Liquid glue is injected into the accommodating groove and solidified, and the clamp is removed to form a display module including a first filling glue layer; the first filling glue layer at least covers the protective glue layer and fills the gap between the protective glue layer, the optical glue layer and the cover layer; at the bending area, the frame area includes a first edge close to the display area and a second edge away from the display area; the orthographic projection of the first filling glue layer on the cover layer covers the orthographic projection of the second edge on the cover layer.

[0033] In a fourth aspect, based on the same inventive concept, the present disclosure provides the following technical solutions through an embodiment:

[0034] A method for manufacturing a display module, the display module comprising a display area and a frame area located on at least one side of the display area, the method comprising:

[0035] providing a display panel;

[0036] A stacked optical adhesive layer, a protective adhesive layer and a cover layer are formed on the display panel; wherein at least one side of the display panel is provided with a bending area located at the frame area, an end of the display panel away from the display area is bent to the backlight side of the display panel through the bending area, the optical adhesive layer and the cover layer are sequentially stacked on the light emitting side of the display panel, and the protective adhesive layer is arranged on a side of the bending area away from the display area;

[0037] Adjusting the azimuth angle of the display panel stacked with the optical adhesive layer, the protective adhesive layer and the cover layer, injecting a first liquid adhesive into the gap between the protective adhesive layer, the optical adhesive layer and the cover layer and then curing the first liquid adhesive to form a first adhesive layer;

[0038] Adjust the azimuth angle of the display panel after forming the first adhesive layer, inject a second liquid glue on the first adhesive layer and the cover layer and then solidify them to form a display module including the second adhesive layer; the viscosity of the second liquid glue is higher than the viscosity of the first liquid glue, the second adhesive layer and the first adhesive layer constitute a first filling glue layer, and at the bending area the border area includes a first edge close to the display area and a second edge away from the display area; the orthographic projection of the first filling glue layer on the cover layer covers the orthographic projection of the first edge on the cover layer, and / or covers the orthographic projection of the second edge on the cover layer.

[0039] In a fifth aspect, based on the same inventive concept, the present disclosure provides the following technical solution through an embodiment:

[0040] A method for manufacturing a display module, the display module comprising a display area and a frame area located on at least one side of the display area, the method comprising:

[0041] providing a display panel;

[0042] A stacked optical adhesive layer, a protective adhesive layer and a cover layer are formed on the display panel; wherein at least one side of the display panel is provided with a bending area located at the frame area, an end of the display panel away from the display area is bent to the backlight side of the display panel through the bending area, the optical adhesive layer and the cover layer are sequentially stacked on the light emitting side of the display panel, and the protective adhesive layer is arranged on a side of the bending area away from the display area;

[0043] A first sub-blocking wall is formed on the cover layer, and liquid glue is injected into the gap between the first sub-blocking wall, the protective glue layer, the optical glue layer and the cover layer; a second sub-blocking wall is formed on the first sub-blocking wall, and liquid glue is injected into the gap between the second sub-blocking wall and the protective glue layer and then cured to form a display module including a first filling glue layer; the first filling glue layer at least covers the protective glue layer and fills the gap between the protective glue layer, the optical glue layer and the cover layer; at the bending area, the frame area includes a first edge close to the display area and a second edge away from the display area; the orthographic projection of the first filling glue layer on the cover layer covers the orthographic projection of the first edge on the cover layer, and / or covers the orthographic projection of the second edge on the cover layer.

[0044] In a sixth aspect, based on the same inventive concept, the present disclosure provides the following technical solutions through an embodiment:

[0045] A display device includes the display module provided by the embodiment of the first aspect.

[0046] Through one or more technical solutions of the present disclosure, the present disclosure has the following beneficial effects or advantages:

[0047] The present disclosure provides a display module, including a display panel with a bending area, and a first filling adhesive layer is provided to at least cover the protective adhesive layer and fill the gap between the protective adhesive layer, the optical adhesive layer and the cover layer to serve as a frame of the display module at the bending area of ​​the display panel, and the orthographic projection of the first filling adhesive layer on the cover layer covers the orthographic projection of the first edge on the cover layer, and / or covers the orthographic projection of the second edge on the cover layer, which can not only further reduce the width of the frame at the bending area, but also improve the bonding strength and sealing performance between the frame at the bending area and the display module, specifically between the first filling adhesive layer and the cover layer, thereby improving the quality and reliability of the display module.

[0048] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present disclosure. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0050] Figure 1A A bottom view of a display module provided by the present disclosure before a frame is formed is shown;

[0051] Figure 1B Shown in Figure 1A A bottom view after a frame is formed on the display panel;

[0052] Figure 1C Shown in Figure 1A A schematic diagram of forming a retaining wall on a display panel;

[0053] Figure 1D A schematic diagram showing that the frame glue fails to completely fill the gap;

[0054] Figure 1E Microstructure photograph showing that the frame glue failed to completely fill the gap;

[0055] Figure 2 A schematic diagram of a display module including a first filling glue layer according to an embodiment of the present disclosure is shown;

[0056] Figure 3AA schematic diagram of a display module including a second filling glue layer according to an embodiment of the present disclosure is shown;

[0057] Figure 3B The embodiment of the present disclosure is shown Figure 3A A schematic diagram of a display module before being bent;

[0058] Figure 4A A schematic diagram showing a clamp directly disposed on the backlight side of a display panel according to an embodiment of the present disclosure is shown;

[0059] Figure 4B A schematic diagram of injecting liquid glue according to an embodiment of the present disclosure is shown;

[0060] Figure 5A A schematic diagram showing a display module including a first retaining wall according to an embodiment of the present disclosure is shown;

[0061] Figure 5B A schematic diagram showing a clamp disposed on a first retaining wall according to an embodiment of the present disclosure is shown;

[0062] Figure 5C A schematic diagram of injecting liquid glue according to an embodiment of the present disclosure is shown;

[0063] Fig. 6A A schematic diagram of a display module is shown in which the first filling adhesive layer of the embodiment of the present disclosure includes a first adhesive layer and a second adhesive layer;

[0064] Figure 6B A schematic diagram showing the injection of a first liquid glue to form a first adhesive layer according to an embodiment of the present disclosure is shown;

[0065] Figure 6C A schematic diagram showing the injection of the second liquid glue to protect the bending area according to an embodiment of the present disclosure is shown;

[0066] Fig.6D A schematic diagram showing the continued injection of the second liquid glue to form a second adhesive layer according to an embodiment of the present disclosure;

[0067] Fig. 7A A schematic diagram of a display module including a second retaining wall according to an embodiment of the present disclosure is shown;

[0068] Figure 7B A schematic diagram showing forming a first sub-retaining wall on a cover plate layer and injecting glue according to an embodiment of the present disclosure is shown;

[0069] Fig. 8A A schematic diagram of a display module in which a middle frame is attached to the lower edge of a cover layer is shown;

[0070] Figure 8B A schematic diagram showing a middle frame of an embodiment of the present disclosure being disposed on a first filling glue layer;

[0071] Description of reference numerals:

[0072] AA, display area; ZA, frame area; Z1, first edge; Z2, second edge; PNL, display panel; WA, bending area; IC, driver chip; TOCA, optical adhesive layer; MCL, protective adhesive layer; CG, cover layer; Fil1, first filling adhesive layer; F11, first adhesive layer; F12, second adhesive layer; Fil2, second filling adhesive layer; Bank1, first retaining wall; Bank2, second retaining wall; B21, first sub-retaining wall; B22, second sub-retaining wall; SL, shading layer; Gap, gap; BF1, first back film layer; SCF, heat dissipation layer; PET, support layer; BF2, second back film layer; CL, clamp; Cap, receiving groove; FR, middle frame. DETAILED DESCRIPTION

[0073] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0074] Various structural schematic diagrams according to embodiments of the present disclosure are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may further design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0075] In the context of the present disclosure, when a layer / element is referred to as being "on" another layer / element, the layer / element may be directly on the other layer / element or an intervening layer / element may exist therebetween. In addition, if a layer / element is "on" another layer / element in one orientation, the layer / element may be "below" the other layer / element when the orientation is reversed.

[0076] In the context of the present disclosure, unless otherwise specified, the light emitting side of the display panel is referred to as the "top side" or "upper side", and the opposite side is referred to as the "bottom side" or "lower side" for ease of describing relative directions. Accordingly, the direction from the bottom side to the top side is the thickness direction of the display panel, and the direction perpendicular to the thickness direction is the "plane direction" or "extension direction" of the display panel. It should be understood that these directions are relative directions rather than absolute directions.

[0077] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0078] With the rapid development of OLED display technology, challenging the process limits, further shortening the border width and increasing the screen-to-body ratio have become an important goal. OLED display modules often use padding bending technology to achieve narrow border design. Figure 1A A bottom view of a flexible OLED display module is provided, i.e., a schematic diagram of the back side of the display module, wherein one side of a display panel PNL in the display module is bent to the back side, and is used to bind or connect a chip on film (COF) provided with a driver chip (IC) and a flexible printed circuit (FPC). The display module has a display area AA and a frame area ZA, wherein, in the area outside the bending area WA of the display panel PNL, a circle of retaining walls Bank is formed on the cover layer CG of the frame area ZA by 3D printing technology as a frame, such as Figure 1B In the bending area WA of the display panel, the frame area (often referred to as the lower frame) located at the bending area WA can be 3D printed using a high viscosity material to form retaining walls Bank1 and Bank2 at the edges of the frame area ZA, as shown in FIG. Figure 1C As shown; next, liquid glue is injected into the formed retaining wall, and then cured to form an extremely narrow frame with a width (or distance) of 0.3mm from the protective glue layer (MCL) of the bending area to the edge of the cover layer (CG Edge). However, the problem with this method is that due to the setting of the retaining wall Bank2, the extension distance of the nozzle for injecting liquid frame glue is limited. Therefore, when injecting liquid frame glue, the frame glue is only affected by gravity and cannot enter the gap between the optical glue layer OCA and the protective glue layer MCL of the lower frame of the display panel, resulting in the frame glue being unable to effectively fill the gap after curing. Figure 1DAs shown in the figure, at the lower frame of the display module, only the retaining wall Bank2 is bonded to the cover layer CG, and the bonding strength at the frame is low and cannot meet the bonding force requirement of >70N, resulting in uncontrollable product quality. Figure 1E A microstructure photograph of the lower frame is provided, from which it can be clearly seen that there is a gap between the optical adhesive layer OCA and the protective adhesive layer MCL that is not filled by the frame adhesive.

[0079] In addition, the above method requires that a retaining wall Bank2 with a width of about 0.26 mm be produced by 3D printing to meet the narrow frame design of 0.3 mm. However, due to the process limitations of 3D printing itself, it is difficult to prepare a retaining wall Bank2 structure with the above width range. In addition, due to the multi-layer stacking of 3D printing, the inter-layer edge morphology of the retaining wall Bank2 is poor, such as Figure 1E As shown in the dotted box in the figure, it cannot meet the assembly requirements of the whole machine.

[0080] In order to solve the above problem, in an optional embodiment, please refer to Figure 2 , a display module is provided, comprising a display area AA and a frame area ZA located on at least one side of the display area AA, the display module further comprising:

[0081] A display panel PNL, wherein at least one side of the display panel PNL is provided with a bending area WA located at the frame area ZA, and an end of the display panel PNL away from the display area AA is bent to the backlight side of the display module through the bending area WA;

[0082] The optical adhesive layer TOCA and the cover layer CG are sequentially stacked on the light-emitting side of the display panel PNL;

[0083] The protective adhesive layer MCL is arranged on a side of the bending area WA away from the display area AA;

[0084] The first filling adhesive layer Fil1 is arranged in the border area ZA where the bending area WA is located. The first filling adhesive layer Fil1 at least covers the protective adhesive layer MCL and fills the gap Gap between the protective adhesive layer MCL, the optical adhesive layer TOCA and the cover layer CG; the border area ZA at the bending area WA includes a first edge Z1 close to the display area AA and a second edge Z2 away from the display area AA; the orthographic projection of the first filling adhesive layer Fil1 on the cover layer CG covers the orthographic projection of the first edge Z1 on the cover layer CG, and / or covers the orthographic projection of the second edge Z2 on the cover layer CG.

[0085] Specifically, the display area AA of the display module is the area where the display panel PNL displays the picture, and the frame area ZA is located at least on one side of the display area AA, usually around the display area AA. At the display area AA, the display panel PNL includes a substrate and a driving function layer and a display function layer stacked on the substrate. At present, the flexible display panel PNL often uses an OLED panel, the corresponding display function layer is an electroluminescent device layer, and the driving function layer is a pixel driving circuit that drives the electroluminescent device layer to emit light. Stacked in sequence on the display function layer are the optical adhesive layer TOCA and the cover layer CG; wherein, the optical adhesive layer TOCA can be prepared using a thermosetting optically transparent hot melt adhesive, and the cover layer CG can use a transparent cover glass (Cover Glass, CG).

[0086] At the bending area WA, the protective adhesive layer MCL stacked on the outer side of the bending area WA is used to release the stress of the display panel PNL at the bending area WA to protect it from damage or cracking during the bending process.

[0087] On the side where the display panel PNL is bent to the backlight side, the display panel PNL at least includes a binding area, which is used to bind or connect a chip on film (COF) and a flexible printed circuit (FPC) provided with a driver chip IC. After the binding process is completed, the binding area of ​​the display panel PNL can be bent toward the backlight side of the display module through the bending area WA, so that the flexible circuit board FPC and the chip on film COF bound to the binding area are bent to the backlight side of the display panel PNL, thereby realizing a narrow frame design of the display module. For those skilled in the art, the frame area ZA where the bending area WA is located is usually referred to as the lower frame of the display module.

[0088] The first edge Z1 and the second edge Z2 of the frame area ZA at the bending area WA may be the boundary line or the boundary area of ​​the lower frame. Figure 2 As shown, the first edge Z1 is relatively close to the display area AA, and the second edge Z2 is relatively far from the display area AA, closer to the edge of the cover layer CG or the display module. The specific positions of the first edge Z1 and the second edge Z2 can be determined according to actual needs.

[0089] The display module provided by the embodiment of the present disclosure includes a display panel PNL having a bending area WA, and a first filling glue layer Fil1 is provided to at least cover the protective glue layer MCL and fill the gap Gap between the protective glue layer MCL, the optical glue layer TOCA and the cover layer CG as the frame of the display module at the bending area WA of the display panel PNL. The orthographic projection of the first filling glue layer Fil1 on the cover layer CG covers the orthographic projection of the first edge Z1 on the cover layer CG, and / or covers the orthographic projection of the second edge Z2 on the cover layer CG. This can not only further reduce the width of the frame at the bending area WA, but also improve the bonding strength and sealing performance between the frame at the bending area WA and the display module, specifically between the first filling glue layer Fil1 and the cover layer CG, thereby improving the quality and reliability of the display module and making it have better dustproof and waterproof performance.

[0090] Among them, when the orthographic projection of the first filling glue layer Fil1 covers the orthographic projection of the first edge Z1, the retaining wall structure at the first edge Z1 can be omitted, and when the orthographic projection of the first filling glue layer Fil1 covers the orthographic projection of the second edge Z2, the retaining wall structure at the second edge Z2 can be omitted, or the retaining wall structures at both locations can be omitted at the same time; this achieves: first, a narrower frame; second, it can overcome the difficulty of forming a retaining wall of a smaller width in the 3D printing process, such as a retaining wall of a width of about 0.26mm required for a 0.3mm narrow frame; third, it can reduce the obstruction of the retaining wall to the glue spraying device, and the liquid glue can be fully injected into the gap Gap between the protective glue layer MCL and the cover layer CG.

[0091] The glue used in the first filling glue layer Fil1 may be glue that is cured by light, heating or other means. Considering the currently commonly used process of the display panel PNL, UV ultraviolet light curing glue may be selected to form the first filling glue layer Fil1.

[0092] In some embodiments, see Figure 3AThe display panel PNL also includes a first back film layer BF1, a heat dissipation layer SCF, a support layer PET and a second back film layer BF2 which are sequentially stacked on the backlight side of the display panel PNL, and the second back film layer BF2 is arranged at the display panel PNL located on the backlight side of the display module. Among them, the heat dissipation layer SCF has the functions of buffering and heat dissipation, and a super clean foam composite film layer (Super Clean Foam, referred to as SCF) can be used. The first back film layer BF1 (Bottom Film) and the second back film layer BF2 can protect the display panel PNL from being scratched in subsequent processes, and can be a PI film (Polyimide) or PET (Polyethylene Terephthalate). The material of the support layer PET can be PET plastic. Optionally, the display panel PNL also includes a shading layer SL, and the shading layer SL can be a layer of shading ink, which is arranged between the cover layer CG and the first filling glue layer Fil1.

[0093] Optional, see Figure 3A The display panel PNL further includes a second filling adhesive layer Fil2, which is disposed in the gap Gap between the display panel PNL and the first back film layer BF1, the heat dissipation layer SCF, the support layer PET, and the second back film layer BF2. The second filling adhesive layer Fil2 can improve the anti-extrusion and anti-impact performance of the display panel PNL at the bending area WA. The second filling adhesive layer Fil2 is combined with the 3D printing process to add a Potting process before the Pad bending process, such as Figure 3B As shown, the pad bending process is then performed, and after curing, the same level of anti-extrusion and anti-impact performance as the display panel PNL manufactured by the mold injection molding process can be achieved. Optionally, the viscosity of the liquid glue of the second filling glue layer Fil2 before curing ranges from 3000Pa·s (Pascal seconds) to 6000Pa·s, which can achieve better anti-extrusion and anti-impact effects.

[0094] In order to make the first filling glue layer Fil1 fill the gap Gap between the optical glue layer TOCA, the protective glue layer MCL and the cover layer CG, the viscosity of the liquid glue can be considered, or the resin molding process can be considered. Next, the structure of the display module provided by the present disclosure and the corresponding manufacturing method will be described in more detail in combination with several optional specific implementation methods.

[0095] Solution 1: In some optional embodiments, please refer to Figure 2In the provided display module, the side surface of the first filling glue layer Fil1 is flush with the edge of the cover layer CG in the direction perpendicular to the cover layer CG. At this time, the first filling glue layer Fil1 covers the second edge Z2, and the retaining wall structure at the second edge Z2 can be omitted.

[0096] Correspondingly, an optional process flow of the manufacturing method includes steps S41 to S44, which are specifically as follows:

[0097] S41: providing a display panel PNL; the display panel PNL has a driving function layer and a display function layer formed by a TFT array process.

[0098] S42: A stacked optical adhesive layer TOCA, a protective adhesive layer MCL and a cover layer CG are formed on the display panel PNL; wherein, at least one side of the display panel PNL is provided with a bending area WA located at the frame area ZA, and one end of the display panel PNL away from the display area AA is bent to the backlight side of the display panel PNL through the bending area WA, the optical adhesive layer TOCA and the cover layer CG are sequentially stacked on the light emitting side of the display panel PNL, and the protective adhesive layer MCL is arranged on the side of the bending area WA away from the display area AA.

[0099] Before the Pad Bending process, the optical adhesive layer TOCA and the protective adhesive layer MCL are stacked on the same side surface of the display panel PNL, and after the Pad Bending process, the protective adhesive layer MCL is in the bending area WA.

[0100] S43: a fixture CL is arranged on the backlight side of the display panel PNL, and the fixture CL, the display panel PNL, the protective adhesive layer MCL, the optical adhesive layer TOCA and the cover layer CG form a receiving groove Cap at the bending area WA, such as Figure 4A shown.

[0101] Specifically, the clamp CL directly contacts the portion of the display panel PNL that is bent toward the backlight side. The shape of the clamp CL may be as follows: Figure 4A The L-shape shown or other similar shapes can form a single-side opening accommodating groove Cap of the desired shape at the bending area WA. As before, the first filling glue layer Fil1 can use UV curing glue. Correspondingly, the material of the clamp CL can be transparent silicone or other materials with UV light transmittance and flexibility, which will neither affect the curing of the glue nor cause extrusion damage to the display panel PNL. After the clamp CL is set up, the display panel PNL can be placed vertically to facilitate subsequent glue injection.

[0102] S44: Inject liquid glue into the accommodating groove Cap and solidify it, remove the clamp CL, and form a display module including a first filling glue layer Fil1; the first filling glue layer Fil1 at least covers the protective glue layer MCL and fills the gap Gap between the protective glue layer MCL, the optical glue layer TOCA and the cover layer CG; the frame area ZA at the bending area WA includes a first edge Z1 close to the display area AA and a second edge Z2 away from the display area AA; the orthographic projection of the first filling glue layer Fil1 on the cover layer CG covers the orthographic projection of the first edge Z1 on the cover layer CG and the orthographic projection of the second edge Z2 on the cover layer CG.

[0103] Optionally, before injecting the liquid glue, reverse pressure can be applied to the fixture CL and the cover layer CG respectively, so that the fixture CL is close to the display panel PNL, so that the containing groove Cap is closed except for the opening area. After the preparation is completed, the liquid glue is injected into the containing groove Cap, and a piezoelectric ceramic valve with a nozzle diameter of 50μm to 65μm can be used to spray liquid glue with a viscosity of <2000Pa·s into the containing groove Cap. Compared with 3D printing, the piezoelectric ceramic valve sprays liquid glue with higher pressure and lower viscosity. Therefore, under the action of injection pressure and gravity, the liquid glue is more likely to flow into the narrow gap between the cover layer CG and the protective glue layer MCL to fill the gap Gap between the protective glue layer MCL, the optical glue layer TOCA and the cover layer CG, such as Figure 4B After the glue injection is completed, UV light is turned on to solidify the liquid glue to form a dense first filling glue layer Fil1 as the lower frame of the display module. After the first filling glue layer Fil1 is solidified, the fixture CL can be removed to obtain Figure 2 The display module shown. Optionally, a release agent matching the UV curing adhesive can be pre-coated on the fixture CL, so that the fixture CL can be easily detached after the first filling adhesive layer Fil1 is cured, and surface defects will not be introduced on the surface of the first filling adhesive layer Fil1. Therefore, this solution can simultaneously achieve the improvement of the bonding strength between the lower frame and the cover layer CG and the improvement of the straightness of the lower frame morphology, thereby enhancing the stability and reliability of the resin molding process.

[0104] For the borders in the other three directions of the display module (the upper border and the borders on both sides), conventional 3D printing technology can be used, that is, using a glue with a viscosity of >1000000Pa·s, and printing a retaining wall structure as a border through 3D printing. Because the structure of these three sides is simple, a border with a thickness of 1.2mm that meets the requirements can be printed at one time, and the edge morphology of the border formed by the high-viscosity glue can also meet the design requirements.

[0105] Solution 2: In some other optional embodiments, please refer to Figure 5AThe display module further includes a first retaining wall bank1, which is stacked on the display panel PNL on the backlight side of the display module and overlaps with the first edge Z1. Compared with Scheme 1, Scheme 2 differs in that the first retaining wall bank1 is added, so that a plate-shaped clamp CL with a simpler shape can be used, and the contact area between the clamp CL and the first filling glue layer Fil1 is reduced, and the clamp CL can be removed more conveniently after the first filling glue layer Fil1 is cured, which is conducive to reducing the adverse effect of the clamp CL on the surface flatness of the first filling glue layer Fil1.

[0106] Correspondingly, an optional process flow of the manufacturing method includes steps S51 to S54, which are specifically as follows:

[0107] S51: providing a display panel PNL.

[0108] S52: A stacked optical adhesive layer TOCA, a protective adhesive layer MCL, a cover layer CG and a first retaining wall bank1 are formed on the display panel PNL; wherein, at least one side of the display panel PNL is provided with a bending area WA located at the frame area ZA, and one end of the display panel PNL away from the display area AA is bent to the backlight side of the display panel PNL through the bending area WA, the optical adhesive layer TOCA and the cover layer CG are sequentially stacked on the light emitting side of the display panel PNL, and the protective adhesive layer MCL is arranged on the side of the bending area WA away from the display area AA; the first retaining wall bank1 is located on the backlight side of the display panel PNL.

[0109] Before the pad bending process, the optical adhesive layer TOCA, the protective adhesive layer MCL and the first retaining wall bank1 are stacked on the same side surface of the display panel PNL. After the pad bending process, the protective adhesive layer MCL is located at the bending area WA of the display panel PNL, and the first retaining wall bank1 is bent to the backlight side of the display panel PNL. The first retaining wall bank1 can be formed by a 3D printing process using a high-viscosity adhesive material with a viscosity of >1000000 Pa·s.

[0110] S53: Set a fixture CL on the first retaining wall bank1, such as Figure 5B As shown, the clamp CL, the first retaining wall bank1, the display panel PNL, the protective adhesive layer MCL, the optical adhesive layer TOCA and the cover layer CG form a receiving groove Cap at the bending area WA.

[0111] The material of the clamp CL can be transparent silicone or other materials with UV light transmittance and flexibility, which will neither affect the curing of the glue nor cause extrusion damage to the display panel PNL. After the clamp CL is set, the display panel PNL can be placed vertically to form a accommodating groove Cap with a fixed side opening to facilitate subsequent glue injection. In addition, due to the existence of the first retaining wall bank1, the clamp CL can be as follows Figure 5B The plate-shaped fixture CL shown can also be Figure 4B The L-shaped or other shaped clamp CL shown.

[0112] S54: injecting liquid glue into the containing groove Cap and curing it, removing the clamp CL, and forming a display module including the first filling glue layer Fil1, such as Figure 5C As shown; the first filling glue layer Fil1 at least covers the protective glue layer MCL and fills the gap Gap between the protective glue layer MCL, the optical glue layer TOCA and the cover layer CG; the frame area ZA at the bending area WA includes a first edge Z1 close to the display area AA and a second edge Z2 away from the display area AA; the orthographic projection of the first filling glue layer Fil1 on the cover layer CG covers the orthographic projection of the second edge Z2 on the cover layer CG.

[0113] Similar to Scheme 1, before injecting the liquid glue, reverse pressure can be applied to the fixture CL and the cover layer CG respectively, so that the fixture CL is close to the display panel PNL, so that the accommodating groove Cap is in a closed state except for the opening area. After the preparation is completed, liquid glue is injected into the accommodating groove Cap, and a piezoelectric ceramic valve with a nozzle diameter of 50μm to 65μm can be used to spray liquid glue with a viscosity of <2000Pa·s into the accommodating groove Cap. Compared with 3D printing, the piezoelectric ceramic valve sprays liquid glue with higher pressure and lower viscosity. Therefore, under the action of injection pressure and gravity, the liquid glue is more likely to flow into the narrow gap between the cover layer CG and the protective glue layer MCL to fill the gap Gap between the protective glue layer MCL, the optical glue layer TOCA and the cover layer CG.

[0114] For Scheme 1 and Scheme 2, the glue material used for the first filling glue layer Fil1 has a viscosity of no more than 2000 Pa·s before curing. Liquid glue with a viscosity in this range has better fluidity and is more conducive to flowing into the gap Gap between the protective glue layer MCL, the optical glue layer TOCA and the cover layer CG, thereby forming a complete and dense first filling glue layer Fil1 after curing without generating holes, which is more conducive to improving the bonding strength and sealing performance.

[0115] Solution 3: Please refer to Fig. 6A The provided display module has a first filling glue layer Fil1 including a first adhesive layer F11 and a second adhesive layer F12, wherein the first adhesive layer F11 fills the gap Gap, and the second adhesive layer F12 covers the protective adhesive layer MCL outside the gap Gap, and the viscosity of the glue of the second adhesive layer F12 before curing is higher than the viscosity of the glue of the first adhesive layer F11 before curing.

[0116] Specifically, the idea of ​​scheme 3 is to first use the characteristics of the adhesive material with lower viscosity to have better fluidity to better fill the gap Gap between the protective adhesive layer MCL and the cover layer CG. Then, the outer part of the gap Gap is encapsulated with an adhesive material with higher viscosity, which can improve the bonding strength between the first protective adhesive layer MCL and the cover layer CG. Optionally, the viscosity of the adhesive liquid of the first adhesive layer F11 before curing is not higher than 2000 Pa·s, and the viscosity of the adhesive liquid of the second adhesive layer F12 before curing is not lower than 1000000 Pa·s.

[0117] Correspondingly, a process flow of an optional manufacturing method includes steps S61 to S64, which are specifically as follows:

[0118] S61: providing a display panel PNL.

[0119] S62: A stacked optical adhesive layer TOCA, a protective adhesive layer MCL and a cover layer CG are formed on the display panel PNL; wherein, at least one side of the display panel PNL is provided with a bending area WA located at the frame area ZA, and one end of the display panel PNL away from the display area AA is bent to the backlight side of the display panel PNL through the bending area WA, the optical adhesive layer TOCA and the cover layer CG are sequentially stacked on the light emitting side of the display panel PNL, and the protective adhesive layer MCL is arranged on the side of the bending area WA away from the display area AA.

[0120] S63: adjusting the azimuth angle of the display panel PNL stacked with the optical adhesive layer TOCA, the protective adhesive layer MCL and the cover layer CG, injecting a first liquid adhesive into the gap Gap between the protective adhesive layer MCL, the optical adhesive layer TOCA and the cover layer CG and curing the gap Gap to form a first adhesive layer F11.

[0121] See also Figure 6B The display panel PNL is rotated 65° to 70° counterclockwise from the horizontal direction, and a low-viscosity liquid glue is dripped through a glue injection device to fill the gap Gap. It can be understood that the low-viscosity glue has better fluidity and can completely fill the gap Gap. The glue can be a UV curing glue, and after the liquid glue is filled, it is cured by UV light to form a first adhesive layer F11 that fills the gap Gap.

[0122] S64: Adjust the azimuth angle of the display panel PNL after forming the first adhesive layer F11, inject the second liquid glue on the first adhesive layer F11 and the cover layer CG and then solidify them to form a display module including the second adhesive layer F12; the viscosity of the second liquid glue is higher than the viscosity of the first liquid glue, the second adhesive layer F12 and the first adhesive layer F11 constitute a first filling adhesive layer Fil1, and the frame area ZA at the bending area WA includes a first edge Z1 close to the display area AA and a second edge Z2 away from the display area AA; the orthographic projection of the first filling adhesive layer Fil1 on the cover layer CG covers the orthographic projection of the first edge Z1 on the cover layer CG, and / or covers the orthographic projection of the second edge Z2 on the cover layer CG.

[0123] See also Figure 6C , the display panel PNL can be turned back to a horizontal position, and then a second liquid glue with high viscosity is used to coat the vertical cover layer CG to protect the bending area WA of the display panel PNL. Fig.6D As shown, continue to apply high-viscosity glue to protect the portion of the bending area WA away from the cover layer CG, and after curing, form a second adhesive layer F12, which is combined with the first adhesive layer F11 to form the first filling adhesive layer Fil1. Considering that the second adhesive layer F12 has a higher viscosity and poor fluidity, there is no need to set a retaining wall structure at the first edge Z1 and the second edge Z2 when applying the high-viscosity liquid glue. The second adhesive layer F12 can be formed by utilizing the viscosity of the glue material itself. When the retaining wall structure at the first edge Z1 is omitted, the first filling adhesive layer Fil1 has an inclined surface at the first edge Z1; similarly, when the retaining wall structure at the second edge Z2 is omitted, the first filling adhesive layer Fil1 has an inclined surface at the second edge Z2.

[0124] Optional, see Fig. 6A , the first filling glue layer Fil1 can be kept away from the surface of the cover layer CG, that is, Fig.6D Polishing and grinding the raised position on the upper edge of the middle frame to improve the surface flatness and roughness, which can improve the adhesion when using the middle frame FR for bonding in the subsequent steps.

[0125] In summary, Solution 3 uses a low-viscosity adhesive to fill the gap Gap and a high-viscosity adhesive to protect the bending area WA of the display panel PNL. This can not only further reduce the width of the lower border of the OLED display module, but also increase the bonding strength between the first filling adhesive layer Fil1 and components such as the cover layer CG and the middle frame FR, thereby achieving a narrow border and improved reliability at the same time.

[0126] Solution 4: Please refer to Fig. 7AThe provided display module also includes a second retaining wall bank2, which is arranged on the cover layer CG at the second edge Z2. The second retaining wall bank2 includes a first sub-retaining wall B21 and a second sub-retaining wall B22 stacked on the first sub-retaining wall B21. In the direction perpendicular to the cover layer CG, the height of the first sub-retaining wall B21 is greater than the height of the gap Gap, and the height difference is 5μm to 10μm. The height of the gap Gap is the minimum height between the protective glue layer MCL and the cover layer CG.

[0127] As mentioned above, the second retaining wall bank2 set at the second edge Z2 will affect the filling of the liquid glue in the gap Gap. In order to solve this problem, in addition to removing the second retaining wall bank2 and using a low-viscosity glue, the second retaining wall bank2 can also be formed in steps, specifically, a first sub-retaining wall B21 slightly higher than the gap Gap is formed on the cover layer CG. The shorter first sub-retaining wall B21 will not cause too much obstruction to the glue spraying port extending into the gap Gap, so the glue spraying port can penetrate into the gap Gap to spray glue, so that the liquid glue fills the entire gap Gap area. Then, a second sub-retaining wall B22 is formed on the top of the first sub-retaining wall B21, and liquid glue is injected to protect the bending area WA of the display panel PNL.

[0128] It should be noted that the first sub-retaining wall B21 and the second sub-retaining wall B22 are used to illustrate the step-by-step formation of the second retaining wall bank2, and are not limited to the existence of two retaining walls with clear boundaries in the second retaining wall bank2. After the second sub-retaining wall B22 is formed, it can form an integrated second retaining wall bank2 structure with the first sub-retaining wall B21.

[0129] Correspondingly, an optional process flow of the manufacturing method includes steps S71 to S73, which are specifically as follows:

[0130] S71: Provide a display panel PNL.

[0131] S72: forming a stacked optical adhesive layer TOCA, a protective adhesive layer MCL and a cover layer CG on the display panel PNL; wherein at least one side of the display panel PNL is provided with a bending area WA located at the frame area ZA, an end of the display panel PNL away from the display area AA is bent to the backlight side of the display panel PNL through the bending area WA, the optical adhesive layer TOCA and the cover layer CG are sequentially stacked on the light emitting side of the display panel PNL, and the protective adhesive layer MCL is arranged on the side of the bending area WA away from the display area AA;

[0132] S73: forming a first sub-blocking wall B21 on the cover layer CG, and injecting liquid glue into the gap Gap between the first sub-blocking wall B21, the protective glue layer MCL, the optical glue layer TOCA and the cover layer CG, such as Figure 7BAs shown; a second sub-blocking wall B22 is formed on the first sub-blocking wall B21, and liquid glue is injected into the gap Gap between the second sub-blocking wall B22 and the protective glue layer MCL and then cured to form a display module including a first filling glue layer Fil1; the first filling glue layer Fil1 at least covers the protective glue layer MCL and fills the gap Gap between the protective glue layer MCL, the optical glue layer TOCA and the cover layer CG; the frame area ZA at the bending area WA includes a first edge Z1 close to the display area AA and a second edge Z2 away from the display area AA; the orthographic projection of the first filling glue layer Fil1 on the cover layer CG covers the orthographic projection of the first edge Z1 on the cover layer CG, and / or covers the orthographic projection of the second edge Z2 on the cover layer CG.

[0133] By performing the second retaining wall bank2 and the glue injection step by step, the frame glue can smoothly fill the gap Gap, and a curing glue with a higher viscosity can be used, thereby significantly improving the bonding strength and sealing performance between the frame area ZA and the display module, and having higher reliability.

[0134] For schemes 1 to 4, the minimum distance between the side of the first filling glue layer Fil1 and the protective glue layer MCL in the direction perpendicular to the surface of the cover layer CG is 0.25mm to 0.35mm; optionally, in the direction perpendicular to the surface of the cover layer CG, the thickness between the first filling glue layer Fil1 and the protective glue layer MCL is 0.35mm to 0.45mm, thereby further narrowing the width of the lower frame.

[0135] After forming the first filling glue layer Fil1, other components of the display module, such as the middle frame FR and the housing, can be assembled on the first filling glue layer Fil1. Currently, an optional process for OLED display modules is to laminate the middle frame FR of the display module to the lower edge of the cover layer CG. The coating width L1 of the first filling glue layer Fil1 can be 0.3mm, and the coating accuracy is ±0.5mm. In this way, the frame width L2 of the entire display module is the middle frame FR width plus the lower frame width, which is about 0.8mm. Fig. 8A shown.

[0136] In order to further shorten the border width and achieve an ultra-narrow bottom border design of about 0.3mm, please refer to Figure 8B, the middle frame FR of the display module can be set on the surface of the first filling glue layer Fil1 away from the cover layer CG. In this way, the width of the lower frame can be narrowed to the width of the first filling glue layer Fil1, that is, about 0.3mm, which can be shortened by 0.5mm compared with the original solution, and the screen-to-body ratio of the display module can be significantly improved. On the other hand, before setting the middle frame FR, the surface of the first filling glue layer Fil1 away from the cover layer CG can be polished and ground first. By increasing the flatness and roughness of the surface, the adhesion between the first filling glue layer Fil1 and the middle frame FR is improved, thereby improving the frame strength, which is conducive to further improving the reliability and stability of the display module. The display module in the disclosed embodiment can be an OLED display product, a QLED (Quantum Dot Light Emitting Diodes) display product, an MLED display product (including Micro-LED micro light-emitting diodes and Mini-LED sub-millimeter light-emitting diodes), etc.

[0137] On the other hand, based on the same inventive concept, in an optional embodiment, a display device is provided, including the display module provided in the first aspect embodiment. The display device can be an electronic device equipped with the above display product, such as a smart phone, a tablet computer, a car display screen, etc.

[0138] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure.

[0139] Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

Claims

1. A display module, characterized in that: The display module comprises a display area and a frame area located on at least one side of the display area, and the display module further comprises: A display panel, wherein at least one side of the display panel is provided with a bending area located at the frame area, and an end of the display panel away from the display area is bent to the backlight side of the display module through the bending area; An optical adhesive layer and a cover plate layer are sequentially stacked on the light-emitting side of the display panel; A protective adhesive layer, disposed on a side of the bending area away from the display area; A first filling adhesive layer is arranged in the border area where the bending area is located, the first filling adhesive layer at least covers the protective adhesive layer and fills the gap between the protective adhesive layer, the optical adhesive layer and the cover layer; the border area at the bending area includes a first edge close to the display area and a second edge away from the display area; the orthographic projection of the first filling adhesive layer on the cover layer covers the orthographic projection of the first edge on the cover layer, and / or covers the orthographic projection of the second edge on the cover layer.

2. The display module according to claim 1, wherein: In a direction perpendicular to the cover layer, a side surface of the first filling adhesive layer is flush with an edge of the cover layer.

3. The display module according to claim 1, wherein: It also includes a first retaining wall, which is stacked on the display panel on the backlight side of the display module and overlaps with the first edge.

4. The display module according to claim 2 or 3, characterized in that: The viscosity of the first filling glue layer before curing is not higher than 2000 Pa·s.

5. The display module according to claim 1, wherein: The first filling adhesive layer includes a first adhesive layer and a second adhesive layer, the first adhesive layer fills the gap, the second adhesive layer covers the protective adhesive layer outside the gap, and the viscosity of the adhesive liquid of the second adhesive layer before curing is higher than the viscosity of the adhesive liquid of the first adhesive layer before curing.

6. The display module according to claim 5, characterized in that: The viscosity of the adhesive liquid of the first adhesive layer before curing is not higher than 2000 Pa·s, and the viscosity of the adhesive liquid of the second adhesive layer before curing is not lower than 1000000 Pa·s.

7. The display module according to claim 1, wherein: It also includes a second retaining wall, which is arranged on the cover layer at the second edge. The second retaining wall includes a first sub-retaining wall and a second sub-retaining wall stacked on the first sub-retaining wall. In the direction perpendicular to the cover layer, the height of the first sub-retaining wall is greater than the height of the gap, and the height difference is 5μm to 10μm; the height of the gap is the minimum height between the protective adhesive layer and the cover layer.

8. The display module according to any one of claims 5 to 7, characterized in that: The first filling adhesive layer has an inclined surface at the first edge.

9. The display module according to claim 1, wherein: It also includes a middle frame, which is arranged on a surface of the first filling glue layer away from the cover layer.

10. The display module according to claim 1, wherein: It also includes a first back film layer, a heat dissipation layer, a support layer, and a second back film layer stacked in sequence on the backlight side of the display panel, wherein the second back film layer is disposed at the display panel on the backlight side of the display module; The display panel further includes a second filling adhesive layer, which is disposed in a gap between the display panel and the first back film layer, the heat dissipation layer, the support layer and the second back film layer.

11. A method for manufacturing a display module, characterized in that: The display module includes a display area and a frame area located on at least one side of the display area, and the method includes: providing a display panel; A stacked optical adhesive layer, a protective adhesive layer and a cover layer are formed on the display panel; wherein at least one side of the display panel is provided with a bending area located at the frame area, an end of the display panel away from the display area is bent to the backlight side of the display panel through the bending area, the optical adhesive layer and the cover layer are sequentially stacked on the light emitting side of the display panel, and the protective adhesive layer is arranged on a side of the bending area away from the display area; A clamp is arranged on the backlight side of the display panel, wherein the clamp, the display panel, the protective adhesive layer, the optical adhesive layer and the cover layer form a receiving groove at the bending area; Liquid glue is injected into the accommodating groove and solidified, and the clamp is removed to form a display module including a first filling glue layer; the first filling glue layer at least covers the protective glue layer and fills the gap between the protective glue layer, the optical glue layer and the cover layer; at the bending area, the border area includes a first edge close to the display area and a second edge away from the display area; the orthographic projection of the first filling glue layer on the cover layer covers the orthographic projection of the first edge on the cover layer and the orthographic projection of the second edge on the cover layer.

12. A method for manufacturing a display module, characterized in that: The display module includes a display area and a frame area located on at least one side of the display area, and the method includes: providing a display panel; A stacked optical adhesive layer, a protective adhesive layer, a cover plate layer and a first retaining wall are formed on the display panel; wherein at least one side of the display panel is provided with a bending area located at the frame area, an end of the display panel away from the display area is bent to the backlight side of the display panel through the bending area, the optical adhesive layer and the cover plate layer are sequentially stacked on the light emitting side of the display panel, the protective adhesive layer is arranged on the side of the bending area away from the display area; the first retaining wall is located on the backlight side of the display panel; A clamp is arranged on the first retaining wall, and the clamp, the first retaining wall, the display panel, the protective adhesive layer, the optical adhesive layer and the cover layer form a receiving groove at the bending area; Liquid glue is injected into the accommodating groove and solidified, and the clamp is removed to form a display module including a first filling glue layer; the first filling glue layer at least covers the protective glue layer and fills the gap between the protective glue layer, the optical glue layer and the cover layer; at the bending area, the frame area includes a first edge close to the display area and a second edge away from the display area; the orthographic projection of the first filling glue layer on the cover layer covers the orthographic projection of the second edge on the cover layer.

13. A method for manufacturing a display module, characterized in that: The display module includes a display area and a frame area located on at least one side of the display area, and the method includes: providing a display panel; A stacked optical adhesive layer, a protective adhesive layer and a cover layer are formed on the display panel; wherein at least one side of the display panel is provided with a bending area located at the frame area, an end of the display panel away from the display area is bent to the backlight side of the display panel through the bending area, the optical adhesive layer and the cover layer are sequentially stacked on the light emitting side of the display panel, and the protective adhesive layer is arranged on a side of the bending area away from the display area; Adjusting the azimuth angle of the display panel stacked with the optical adhesive layer, the protective adhesive layer and the cover layer, injecting a first liquid adhesive into the gap between the protective adhesive layer, the optical adhesive layer and the cover layer and then curing the first liquid adhesive to form a first adhesive layer; Adjust the azimuth angle of the display panel after forming the first adhesive layer, inject a second liquid glue on the first adhesive layer and the cover layer and then solidify them to form a display module including the second adhesive layer; the viscosity of the second liquid glue is higher than the viscosity of the first liquid glue, the second adhesive layer and the first adhesive layer constitute a first filling glue layer, and at the bending area the border area includes a first edge close to the display area and a second edge away from the display area; the orthographic projection of the first filling glue layer on the cover layer covers the orthographic projection of the first edge on the cover layer, and / or covers the orthographic projection of the second edge on the cover layer.

14. A method for manufacturing a display module, characterized in that: The display module includes a display area and a frame area located on at least one side of the display area, and the method includes: providing a display panel; A stacked optical adhesive layer, a protective adhesive layer and a cover layer are formed on the display panel; wherein at least one side of the display panel is provided with a bending area located at the frame area, an end of the display panel away from the display area is bent to the backlight side of the display panel through the bending area, the optical adhesive layer and the cover layer are sequentially stacked on the light emitting side of the display panel, and the protective adhesive layer is arranged on a side of the bending area away from the display area; A first sub-blocking wall is formed on the cover layer, and liquid glue is injected into the gap between the first sub-blocking wall, the protective glue layer, the optical glue layer and the cover layer; a second sub-blocking wall is formed on the first sub-blocking wall, and liquid glue is injected into the gap between the second sub-blocking wall and the protective glue layer and then cured to form a display module including a first filling glue layer; the first filling glue layer at least covers the protective glue layer and fills the gap between the protective glue layer, the optical glue layer and the cover layer; at the bending area, the frame area includes a first edge close to the display area and a second edge away from the display area; the orthographic projection of the first filling glue layer on the cover layer covers the orthographic projection of the first edge on the cover layer, and / or covers the orthographic projection of the second edge on the cover layer.

15. A display device, characterized in that: It comprises the display module as claimed in any one of claims 1 to 10.

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