Display module and manufacturing method therefor, display apparatus, and edge sealing fixture

Abstract

Disclosed are a display module and a manufacturing method therefor, a display apparatus, and an edge sealing fixture. The display module manufacturing method comprises: disposing a cover plate on a light-emitting side of a display substrate, the cover plate comprising a main body portion opposite the display substrate and an edge portion surrounding the main body portion; disposing a solid adhesive on the edge portion; providing an edge sealing fixture comprising a first retaining wall and a second retaining wall, abutting the first retaining wall against the edge portion, and abutting the second retaining wall against the display substrate, so that the solid adhesive is positioned between the first retaining wall and the second retaining wall; heating the solid adhesive to a preset temperature, so that the solid adhesive is converted into a liquid adhesive and is in contact with the display substrate, the edge portion, the first retaining wall, and the second retaining wall; irradiating the liquid adhesive with light of a preset wavelength band, so as to cure the liquid adhesive and form an edge sealant; and separating the edge sealing fixture from the display substrate, the cover plate, and the edge sealant.

Description

Display module and its manufacturing method, display device, edge sealing fixture

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410780526X, filed on June 17, 2024 with the China National Intellectual Property Administration, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to the field of display technology, specifically to a display module and its manufacturing method, a display device, and an edge-sealing fixture. Background Technology

[0004] In OLED (Organic Light-Emitting Diode) display modules, the display substrate and cover plate are positioned opposite each other. An edge sealant is applied around the display substrate, bonding it to both the substrate and cover plate. A bezel surrounds the edge sealant. Current processes for manufacturing the edge sealant include vacuum injection molding and 3D printing. However, vacuum injection molding is prone to issues such as air bubbles, excess / insufficient sealant, and burrs in the injection holes. 3D printing, on the other hand, often results in poor adhesion between the edge sealant and the bezel. Summary of the Invention

[0005] This disclosure aims to solve at least one of the technical problems existing in the prior art, and proposes a display module and its manufacturing method, display device, and edge sealing fixture.

[0006] To achieve the above objectives, this disclosure provides a method for manufacturing a display module, including:

[0007] A cover plate is disposed on the light-emitting side of the display substrate, the cover plate including a main body portion opposite to the display substrate and an edge portion surrounding the main body portion;

[0008] Solid adhesive is applied to the edge portion;

[0009] A sealing fixture including a first retaining wall and a second retaining wall is provided, and the first retaining wall is abutted against the edge portion and the second retaining wall is abutted against the display substrate, so that the solid adhesive is located between the first retaining wall and the second retaining wall;

[0010] The solid adhesive is heated to a preset temperature to convert it into a fluid adhesive, which then comes into contact with the display substrate, the edge portion, the first barrier wall, and the second barrier wall.

[0011] Irradiate the fluid adhesive with light of a preset wavelength to cure it and form an edge-sealing adhesive;

[0012] Separate the edge sealing fixture from the display substrate, the cover plate, and the edge sealing adhesive.

[0013] In some embodiments, the step of heating the solid adhesive to a preset temperature includes:

[0014] The solid adhesive is heated to a preset temperature using the first and second retaining walls.

[0015] In some embodiments, the edge sealing fixture further includes a mounting portion connected between the first retaining wall and the second retaining wall, and a curing lamp is provided on the mounting portion;

[0016] The step of irradiating the fluid adhesive with light of a predetermined wavelength includes:

[0017] The curing lamp is used to irradiate the sealing adhesive in a fluid state with light of a preset wavelength.

[0018] In some embodiments, the edge portion includes a first surface facing the solid adhesive, a second surface opposite to the first surface, and a plurality of first side surfaces connecting the first surface and the second surface, with different first side surfaces located on different sides of the edge portion;

[0019] The edge sealing fixture includes a plurality of first retaining walls forming a ring structure. The first retaining walls correspond one-to-one with the first side. The first retaining wall includes a first shielding surface and a second shielding surface facing each other along its thickness direction. The first shielding surface is located on the side of the second shielding surface closer to the second retaining wall.

[0020] In the step of abutting the first retaining wall against the edge portion, the first shielding surface is fitted to the corresponding first side surface.

[0021] In some embodiments, the edge sealing fixture includes a plurality of second retaining walls, each of which is arranged opposite to the first retaining wall. Each second retaining wall includes a third shielding surface facing the first retaining wall and a supporting surface connected to the third shielding surface. The dihedral angle between the third shielding surface and the supporting surface is an obtuse angle.

[0022] In the step of abutting the second barrier against the display substrate, the support surface is fitted to the display substrate.

[0023] In some embodiments, the orthographic projection of the edge-sealing adhesive on the cover plate overlaps with the orthographic projection of the display substrate on the cover plate.

[0024] This disclosure also provides a display module, including:

[0025] Display substrate;

[0026] A cover plate is disposed on the light-emitting side of the display substrate, the cover plate including a main body portion opposite to the display substrate and an edge portion surrounding the main body portion;

[0027] An edge sealing adhesive, at least a portion of which surrounds the display substrate and is bonded to the display substrate and the edge portion;

[0028] The sealing adhesive can transform from a solid to a fluid when heated to a preset temperature, and can transform from a fluid to a solid when exposed to light of a preset wavelength.

[0029] In some embodiments, the edge portion includes a first surface facing the edge sealant, a second surface opposite to the first surface, and a plurality of first side surfaces connecting the first surface and the second surface, with different first side surfaces located on different sides of the edge portion;

[0030] The sealing adhesive has a ring-shaped structure and includes a third side facing the first surface, a fourth side facing away from the first surface, and a plurality of second side surfaces connecting the third side and the fourth surface. Different second side surfaces are located on different sides of the edge of the sealing adhesive away from the display substrate, and each second side surface is coplanar with one of the first side surfaces.

[0031] In some embodiments, the first surface of the edge portion includes a plurality of first sub-surfaces, each of which is connected to a first side surface in a one-to-one correspondence. At least one of the first sub-surfaces is curved, and the first side surface to which the curved first sub-surface is connected intersects the thickness direction of the display substrate.

[0032] In some embodiments, the sealing adhesive further includes a plurality of third side surfaces connected between the fourth surface and the third surface; different third side surfaces are located on different sides of the edge of the sealing adhesive near the edge of the display substrate, and the dihedral angle between the third side surface and the fourth surface is an obtuse angle.

[0033] In some embodiments, the orthographic projection of the edge-sealing adhesive on the cover plate overlaps with the orthographic projection of the display substrate on the cover plate.

[0034] This disclosure also provides a display device including the display module described above.

[0035] This disclosure also provides an edge-sealing fixture for use in the above-mentioned method for manufacturing the display module, the edge-sealing fixture comprising:

[0036] The first retaining wall is used to abut against the edge of the cover plate;

[0037] The second barrier wall is used to abut against the display substrate;

[0038] A heating structure is used to heat the solid adhesive on the edge portion to a preset temperature so that the solid adhesive is converted into a fluid adhesive.

[0039] A curing structure is used to irradiate the fluid adhesive with light of a preset wavelength so that the fluid adhesive cures to form an edge-sealing adhesive.

[0040] In some embodiments, the first and second retaining walls serve as the heating structure;

[0041] The curing structure includes a mounting part connected between the first retaining wall and the second retaining wall, and a curing lamp disposed on the mounting part, the curing lamp being used to emit light of a preset wavelength.

[0042] In some embodiments, the mounting portion is further provided with an exhaust port.

[0043] In some embodiments, the edge sealing fixture includes a plurality of first retaining walls and a plurality of second retaining walls, the plurality of first retaining walls forming a ring structure, and the second retaining walls being arranged opposite to the first retaining walls in a one-to-one correspondence;

[0044] The first retaining wall includes a first shielding surface and a second shielding surface disposed opposite to each other along its thickness direction. The first shielding surface is located on the side of the second shielding surface closer to the second retaining wall. The second retaining wall includes a third shielding surface facing the first retaining wall.

[0045] The roughness of both the first and third shielding surfaces is less than that of the second shielding surface.

[0046] In some embodiments, the edge portion includes a first surface facing the solid adhesive, a second surface opposite to the first surface, and a plurality of first side surfaces connecting the first surface and the second surface; different first side surfaces are located on different sides of the edge portion;

[0047] The edge sealing fixture includes multiple first retaining walls and multiple second retaining walls, each first retaining wall corresponding to one of the first side walls, and the second retaining walls are arranged opposite to the first retaining walls in a one-to-one correspondence;

[0048] The first retaining wall includes a first shielding surface facing the second retaining wall, the second retaining wall includes a third shielding surface facing the first retaining wall, and a supporting surface connected to the third shielding surface;

[0049] The dihedral angle between the supporting surface and the third shielding surface is an obtuse angle.

[0050] The minimum dihedral angle between the extended surface of the supporting surface and the first shielding surface is equal to the minimum dihedral angle between the extended surface of the first surface and the extended surface of the first side surface.

[0051] In some embodiments, the first barrier wall includes a first metal barrier wall and a first ceramic layer located on the side of the first metal barrier wall near the second barrier wall, the surface of the ceramic layer away from the first metal barrier wall serving as the first shielding surface; the second barrier wall includes a second metal barrier wall and a second ceramic layer located on the side of the second metal barrier wall near the second barrier wall, the surface of the second ceramic layer away from the second metal barrier wall serving as the second shielding surface. Attached Figure Description

[0052] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0053] Figure 1 is a plan view of the display module provided in some embodiments.

[0054] Figure 2 is a cross-sectional view of the display module shown in Figure 1 along line A-A'.

[0055] Figure 3 is a partial structural diagram of the edge position of the display module provided in some other embodiments.

[0056] Figure 4 is a schematic diagram of the manufacturing process of the display module provided in some embodiments of this disclosure.

[0057] Figure 5 is a plan view of the cover plate and display substrate provided in some embodiments of this disclosure.

[0058] Figure 6 is a plan view of the edge banding fixture provided in some embodiments of this disclosure.

[0059] Figure 7 is a schematic diagram showing the positional relationship between the drive unit and the edge banding fixture provided in some embodiments of this disclosure.

[0060] Figure 8 is a plan view of a display module provided in some embodiments of this disclosure.

[0061] Figure 9 is a cross-sectional view of the display module shown in Figure 8 along line B-B'.

[0062] Figure 10 is a cross-sectional view of the display module shown in Figure 8 along line C-C'.

[0063] Figure 11 is a schematic diagram of the cover plate, display substrate and sealing adhesive in Figure 8. Detailed Implementation

[0064] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0065] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0066] Unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0067] As used herein, “parallel” and “perpendicular” include the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “parallel” includes absolute parallelism and approximate parallelism, where an acceptable range of deviation for approximate parallelism may be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where an acceptable range of deviation for approximate perpendicularity may also be, for example, within 5°.

[0068] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0069] This document describes exemplary embodiments with reference to cross-sectional views and / or planar schematic diagrams as idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the regions of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0070] Figure 1 is a plan view of a display module provided in some embodiments, and Figure 2 is a cross-sectional view of the display module shown in Figure 1 along line A-A'. As shown in Figures 1 and 2, the display module includes a display substrate 10 and a cover plate 20, with the cover plate 20 disposed on the light-emitting side of the display substrate 10. The display substrate 10 can be a flexible display substrate 10, which includes a display portion 11, a driving portion 12, and a curved portion 13 connecting the two. The display portion 11 faces the cover plate 20, and the driving portion 12 is located on the side of the display portion 11 away from the cover plate 20 and is electrically connected to a circuit board. A filler adhesive 60 is disposed between the driving portion 12 and the display portion 11. An edge sealing adhesive 30 is disposed at the edge of the cover plate 20 and is bonded to the cover plate 20 and the display substrate 10. A frame 40 surrounds the edge sealing adhesive 30 and is bonded to the cover plate 20 and the edge sealing adhesive 30. For example, the frame 40 includes a retaining wall portion 41 and a shielding portion 42. The retaining wall portion 41 is bonded to the side of the edge sealant 30 and the cover plate 20, and the retaining wall portion 42 is bonded to the surface of the edge sealant 30 away from the cover plate 20 by the frame adhesive.

[0071] In some embodiments, the edge-sealing adhesive 30 in Figure 2 is prepared using an injection molding process. Specifically, the cover plate 20 and the display substrate 10, which are fixed together, are placed in a vacuum injection molding fixture 70. Under a vacuum environment of 40 kPa, adhesive is injected through the injection port of the vacuum injection molding fixture 70. The adhesive circulates around the edge of the cover plate 20 and then overflows from the injection port. The adhesive is then subjected to a thermosetting process, for example, curing at 65°C for 60 minutes. Finally, the vacuum injection molding fixture 70 is separated from the product, as shown in Figure 4. However, the edge-sealing adhesive 30 prepared in this way is prone to problems such as air bubbles, excess / insufficient adhesive, and burrs in the injection holes.

[0072] Figure 3 is a partial structural schematic diagram of the edge position of the display module provided in some other embodiments. Figure 3 is a cross-sectional view of the display module shown in Figure 1 taken along line A-A'. As shown in Figure 3, in some other embodiments, the edge sealing adhesive 30 is made by 3D printing. Specifically, a first dam 51 and a second dam 52 are first formed at the edge of the cover plate 20 and the edge of the display substrate 10, respectively. Then, adhesive is printed between the first dam 51 and the second dam 52 by printing, and then cured. In this case, the first dam 51 and the second dam 52 both consist of multiple layers of organic film. Due to repulsion, the surface of the printed adhesive will form a depression at the contact point with the first dam 51 and the second dam 52, resulting in low surface flatness of the cured sealing adhesive 30. Furthermore, when setting the frame 40, the retaining wall portion of the frame 40 is bonded to the first dam 51, but the side of the first dam 51 away from the display substrate 10 is not flat, which can easily lead to low connection stability between the first dam 51 and the frame 40. Additionally, due to certain process errors in the manufacturing process of the first dam 51 and the second dam 52, as well as in the printing process of the adhesive, the positional accuracy of the final sealing adhesive 30 will be reduced.

[0073] In order to at least solve one of the above-mentioned technical problems, this disclosure provides a method for manufacturing a display module. Figure 4 is a schematic diagram of the preparation process of a display module provided in some embodiments of this disclosure. As shown in Figure 4, the method for manufacturing a display module includes the following steps S1 to S6.

[0074] In step S1, a cover plate 20 is disposed on the light-emitting side of the display substrate 10. The cover plate 20 includes a main body portion 21 opposite to the display substrate 10 and an edge portion 22 surrounding the main body portion 21.

[0075] In step S2, a solid adhesive 31 is applied to the edge portion 22. This solid adhesive 31 may or may not be in contact with the display substrate 10. In some embodiments, the solid adhesive 31 can transform from a solid state to a fluid state when heated to a preset temperature, and further transform from a fluid state to a solid state under light illumination.

[0076] In step S3, an edge sealing fixture 70 including a first barrier 71 and a second barrier 72 is provided, and the first barrier 71 is abutted against the edge portion 22, and the second barrier 72 is abutted against the display substrate 10, so that the solid adhesive 31 is located between the first barrier 71 and the second barrier 72.

[0077] In step S4, the solid adhesive 31 is heated to a preset temperature so that the solid adhesive 31 is transformed into a fluid adhesive 32 and comes into contact with the display substrate 10, the edge portion 22, the first barrier 71 and the second barrier 72.

[0078] In step S4, after the solid adhesive 31 is converted into the fluid adhesive 32, it flows between the first baffle 71 and the second baffle 72 until it is leveled.

[0079] In step S5, light of a preset wavelength is irradiated onto the fluid adhesive 32 to cure the fluid adhesive 32 and form the sealing adhesive 30.

[0080] In step S6, the edge sealing fixture 70 is demolded, that is, the edge sealing fixture 70 is separated from the display substrate 10, the cover plate 20 and the edge sealing adhesive 30.

[0081] In this embodiment, when preparing the edge sealing adhesive 30, a solid adhesive 31 is first placed on the edge 22 of the cover plate 20, and then the solid adhesive 31 is heated to level it in the target area. The leveled fluid adhesive 32 is then cured. Compared to vacuum injection molding, the edge sealing adhesive 30 in this embodiment is formed by self-leveling and then curing of the adhesive, eliminating injection holes and thus avoiding burr problems at injection hole locations. Furthermore, the leveling process reduces the generation of air bubbles. Additionally, by controlling the size of the solid adhesive 31, overflow / insufficient adhesive problems can be prevented. Compared to 3D printing, in this embodiment, when preparing the edge sealing adhesive 30, the first barrier 71 and the second barrier 72 are used to shield the fluid adhesive 32. Compared to the first and second dams 51 and 52 formed by stacking multiple organic films, the inner surface morphology of the first barrier 71 and the second barrier 72 of the edge sealing fixture 70 is easier to control, thus making it easier to control the morphology of the side of the edge sealing adhesive 30 for easier fixation to the frame 40.

[0082] In addition, compared with vacuum injection molding and 3D printing processes, the embodiments of this disclosure do not require secondary finishing (grinding, cutting, scraping, etc.) during the preparation of the edge sealing adhesive 30, thereby improving production efficiency.

[0083] The manufacturing method in the embodiments of this disclosure will be described in more detail below with reference to Figure 4 and specific examples.

[0084] In step S1, a cover plate 20 is disposed on the light-emitting side of the display substrate 10. The cover plate 20 includes a main body portion 21 opposite to the display substrate 10 and an edge portion 22 surrounding the main body portion.

[0085] Figure 5 is a plan view of the cover plate and display substrate provided in some embodiments of this disclosure. As shown in Figure 5, the orthographic projection of the edge portion 22 of the cover plate 20 onto the plane of the main body portion 22 of the cover plate is a rectangular ring structure. The edge portion 22 includes a first surface 221 facing the sealing adhesive 30, a second surface 222 opposite to the first surface 221, and a plurality of first side surfaces 223 connecting the first surface 221 and the second surface 222. Different first side surfaces 223 are located on different sides of the edge portion 22, and the first side surfaces 223 are planar.

[0086] In some examples, the first surface 221 includes a plurality of first sub-surfaces connected in sequence, and the second surface 222 includes a plurality of second sub-surfaces connected in sequence. Each first and second sub-surface corresponds one-to-one with a first side surface 223, which is connected between the corresponding first and second sub-surfaces. At least one first sub-surface and the corresponding second sub-surface are curved surfaces to meet diverse user needs. Here, the curved surface can be part of a cylindrical surface. For example, on opposite sides of the display substrate 10, the edge portion 22 bends toward the display substrate 10, i.e., two oppositely arranged first sub-surfaces and two corresponding second sub-surfaces are curved surfaces; or, for example, on each side of the display substrate 10, the edge portion 22 bends toward the substrate, i.e., each first and second sub-surface is curved. Figure 4 only shows, by example, the morphology of one side of the first sub-surface, second sub-surface, and first side surface 223. When the first sub-surface is curved, the first side surface 223 connected to the first sub-surface is an inclined slope that intersects the thickness direction of the display substrate 10. For example, the cross-section of the first sub-face at the position where it connects with the first side surface 223 is perpendicular to the first side surface 223, and the cross-section of the second sub-face at the position where it connects with the first side surface 223 is also perpendicular to the first side surface 223.

[0087] In step S2, solid adhesive 31 is applied to the edge portion 22. The amount of solid adhesive 31 can be determined based on the desired morphology of the final edge-sealing adhesive 30.

[0088] In step S3, an edge sealing fixture 70 including a first barrier 71 and a second barrier 72 is provided, and the first barrier 71 is abutted against the edge portion 22, and the second barrier 72 is abutted against the display substrate 10, so that the solid adhesive 31 is located between the first barrier 71 and the second barrier 72.

[0089] Corresponding to the shape of the edge portion 22, the orthographic projection of the edge sealing fixture 70 onto the plane containing the main body portion 22 of the cover plate is also a rectangular ring structure. Figure 6 is a plan view of the edge sealing fixture provided in some embodiments of this disclosure. In some embodiments, as shown in Figure 6, the edge sealing fixture 70 includes a plurality of first baffles 71 and a plurality of second baffles 72. The plurality of first baffles 71 are connected to form a rectangular ring structure, and the plurality of second baffles 72 are connected to form a rectangular ring structure. The term "rectangular ring structure" here refers to the fact that the orthographic projection of this structure onto a reference plane perpendicular to the thickness direction of the display substrate 10 is a rectangular ring. The plurality of first baffles 71 are arranged around the plurality of second baffles 72, and the first baffles 71 and the second baffles 72 are arranged opposite each other in a one-to-one correspondence. The first baffle 71 includes a first shielding surface 711 and a second shielding surface 712 facing each other along its thickness direction. The first shielding surface 711 is located on the side of the second shielding surface 712 closer to the second baffle 72. The second barrier 72 includes a third shielding surface 723 facing the first barrier 71 and a fourth shielding surface 724 facing away from the first barrier 71. In addition, the second barrier 72 also includes a support surface 721 connected to the third shielding surface 723. The support surface 721 is used to press onto the display substrate 10 when preparing the edge sealing adhesive 30.

[0090] In some embodiments, in step S3, the first shielding surface 711 is fitted to the corresponding first side surface 223, which facilitates the flushing of the side surface of the final edge-sealing adhesive 30 with the first side surface 223, and helps to fix the frame 40 to the edge-sealing adhesive 30. The fitting arrangement in this embodiment means that the two surfaces are conformal and there is a certain pressure between them; it does not mean that the two surfaces necessarily have the same area.

[0091] For vacuum injection molding and 3D printing processes, due to limitations in process conditions, it is difficult to inject or print adhesives on curved surfaces. However, in this embodiment, by using the first and second baffles 71 and 72 of the edge-sealing fixture 70 for shielding, and by liquefying and then curing the solid adhesive 31, edge-sealing adhesive 30 can be formed on the curved surface. Furthermore, the first baffle 71 is a ring-shaped structure and matches the size of the cover plate 20. In this case, by fitting the first baffle 71 to the first side 223 of the cover plate 20, the positional accuracy of the edge-sealing fixture 70 on the cover plate 20 can be improved, thereby enhancing the positional accuracy of the edge-sealing adhesive 30.

[0092] In one example, in step S3, the pressure between the edge sealing fixture 70 and the display substrate 10, and between the edge sealing fixture 70 and the cover plate 20, does not exceed 0.3 MPa, so as to avoid damage to the cover plate 20 and the display substrate 10.

[0093] In some embodiments, the dihedral angle between the support surface 721 and the third shielding surface 723 is an obtuse angle. In step S3, the support surface 721 is pressed onto the surface of the display substrate 10 facing away from the cover plate 20, and the support surface 721 is attached to the display substrate 10. By setting the dihedral angle between the support surface 721 and the third shielding surface 723 to an obtuse angle, the inner surface of the final formed edge sealing adhesive 30 can be beveled. When the frame 40 is subsequently formed, a portion of the frame 40 can be bonded to the inner surface of the edge sealing adhesive 30, thereby increasing the bonding area between the frame 40 and the edge sealing adhesive 30 and improving the stability of their connection.

[0094] In step S4, the edge sealing adhesive 30 is heated to a preset temperature so that the solid adhesive 31 is converted into a fluid adhesive 32 and comes into contact with the display substrate 10, the edge portion 22, the first barrier 71 and the second barrier 72.

[0095] In some embodiments, the first baffle 71 and the second baffle 72 can be made of a material with good thermal conductivity, such as metal. The heating process of the solid adhesive 31 in step S4 specifically includes heating the solid adhesive 31 to a preset temperature using the first baffle 71 and the second baffle 72. It should be noted that during the heating process, the heating of the solid adhesive 31 does not stop immediately upon reaching the preset temperature; rather, the heating can be maintained for a certain period to allow it to fully liquefy. For example, the heating temperature is between 55°C and 70°C, and the heating time is between 3 and 10 seconds; for example, the heating temperature is 60°C, and the heating time is 5 seconds. After the fluid adhesive 32 has leveled, step S5 is performed.

[0096] In step S5, the fluid adhesive 32 is irradiated with light of a preset wavelength to cure the fluid adhesive 32 and form the sealing adhesive 30.

[0097] In some embodiments, the edge-sealing fixture 70 further includes a mounting portion 73 connected between the first retaining wall 71 and the second retaining wall 72, and a curing lamp 74 is provided on the mounting portion 73. Step S5 may specifically include: irradiating the fluid adhesive 32 with light of a preset wavelength using the curing lamp 74. For example, the curing lamp 74 is an ultraviolet curing lamp 74, and the preset wavelength of light is ultraviolet light.

[0098] In some embodiments, the mounting portion 73 may be an annular structure, and an exhaust port V1 may be provided on the mounting portion 73 to facilitate exhaust during the heating process.

[0099] In some embodiments, the orthographic projection of the sealing adhesive 30 on the cover plate 20 overlaps with the orthographic projection of the display substrate 10 on the cover plate 20, as shown in S6 of FIG4.

[0100] In step S6, the edge sealing fixture 70 is demolded, that is, the edge sealing fixture 70 is separated from the display substrate 10, the cover plate 20 and the edge sealing adhesive 30.

[0101] In some embodiments, the roughness of the first shielding surface 711 and the third shielding surface 723 is less than the roughness of the second shielding surface 712. Specifically, in embodiments of this disclosure, the first shielding surface 711 and the third shielding surface 723 can be processed to make them smoother, reducing the adhesion between the first shielding surface 711, the third shielding surface 723 and the edge sealing adhesive 30, thereby facilitating the demolding of the edge sealing fixture 70. For example, the first retaining wall 71 may include a first metal retaining wall and a first ceramic layer located inside the first metal retaining wall, with the surface of the first ceramic layer away from the first metal retaining wall serving as the first shielding surface 711; the second retaining wall 72 may include a second metal retaining wall and a second ceramic layer located inside the second metal retaining wall, with the surface of the second ceramic layer away from the second metal retaining wall serving as the second shielding surface 712. By providing the first ceramic layer and the second ceramic layer, heat conduction can be achieved while reducing the adhesion between the edge sealing fixture 70 and the edge sealing adhesive 30.

[0102] In some embodiments, after step S6, a frame 40 may be provided around the sealing adhesive 30, so that the frame 40 surrounds the sealing adhesive 30, the cover plate 20 and the display substrate 10, and is connected to the sealing adhesive 30 and the cover plate 20.

[0103] It should be noted that Figure 4 shows a cross-sectional view of one edge of the display substrate 10. In some examples, the display substrate 10 can be a rigid substrate. In this case, the process of forming the sealing adhesive 30 on each edge of the display substrate 10 can be shown in Figure 4. In other examples, the display substrate 10 can be a flexible display substrate 10, as shown in Figure 5. The display substrate 10 includes a display portion 11, a driving portion 12, and a bent portion 13 connecting the display portion 11 and the driving portion 12. By bending the bent portion 13, the driving portion 12 is located on the side of the display portion 11 away from the cover plate 20. In this case, when preparing the sealing adhesive 30, the display portion 11, the driving portion 12, and the bent portion 13 are treated as an integral structure. The second baffle 72 is supported on the side of this integral structure away from the cover plate 20. That is, for the position where the driving portion 12 is not provided, the second baffle 72 is supported on the display portion 11, as shown in Figure 4; for the position where the driving portion 12 is provided, the second baffle 72 is supported on the driving portion 12, as shown in Figure 7. It should also be noted that when the display substrate 10 includes a bent portion 13 and a driving portion 12, before applying solid adhesive 31 to the cover plate 20, a cured filler adhesive 60 can be formed between the driving portion 12 and the display portion 11, as shown in FIG7.

[0104] This disclosure also provides a display module, which is obtained by the above-described manufacturing method. Figure 8 is a plan view of the display module provided in some embodiments of this disclosure, Figure 9 is a cross-sectional view of the display module shown in Figure 8 along line B-B', and Figure 10 is a cross-sectional view of the display module shown in Figure 8 along line C-C'. As shown in Figures 8 to 10, the display module includes: a display substrate 10, a cover plate 20, and an edge sealing adhesive 30.

[0105] The display substrate 10 may be an OLED display substrate 10, which includes a substrate, a driving circuit layer disposed on the substrate, and a plurality of light-emitting devices. These plurality of light-emitting devices may include, for example, red, green, and blue light-emitting devices. Additionally, the display substrate 10 in this embodiment may also include a heat dissipation layer or similar structure disposed on the side of the substrate away from the light-emitting devices.

[0106] The cover plate 20 is disposed on the light-emitting side of the display substrate 10. The cover plate 20 includes a main body portion 21 opposite to the display substrate 10 and an edge portion 22 surrounding the main body portion.

[0107] The edge sealing adhesive 30 is disposed at the edge of the display substrate 10, and at least a portion of the edge sealing adhesive 30 surrounds the display substrate 10, and the edge sealing adhesive 30 is bonded to the display substrate 10 and the edge portion 22.

[0108] Among them, the edge sealing adhesive 30 can transform from a solid to a fluid when heated to a preset temperature; and can transform from a fluid to a solid when irradiated by light of a preset wavelength.

[0109] The edge sealing adhesive 30 may include hot melt adhesive material and a photoinitiator mixed in the hot melt adhesive material. The photoinitiator can cure the edge sealing adhesive 30 under the irradiation of light of a preset wavelength.

[0110] Table 1 shows the material parameters of the edge-sealing adhesive 30 in some embodiments of this disclosure.

[0111] Table 1

[0112] Figure 11 is a schematic diagram of the cover plate, display substrate, and edge sealant in Figure 8. In some embodiments, as shown in Figures 4 and 11, the edge portion 22 includes a first surface 221 facing the edge sealant 30, a second surface 222 opposite to the first surface 221, and a plurality of first side surfaces 223 connecting the first surface 221 and the second surface 222. Different first side surfaces 223 are located on different sides of the edge portion 22. The edge sealant 30 has an annular structure and includes a third surface (i.e., the lower surface of the edge sealant 30 in Figure 11) bonded to the first surface 221, a fourth surface 304 facing away from the first surface 221, and a plurality of second side surfaces 302 connecting the third surface and the fourth surface 304. Different second side surfaces 302 are located on different sides of the outer edge of the edge sealant 30 (i.e., the edge of the edge sealant 30 away from the display substrate), and each second side surface 302 is coplanar with a first side surface 223.

[0113] In some embodiments, as shown in FIG11, the sealing adhesive 30 further includes a plurality of third side surfaces 303, which are connected between the fourth surface 304 and the third surface; different third side surfaces 303 are located on different sides of the inner edge of the sealing adhesive 30 (i.e., the edge of the sealing adhesive 30 near the display substrate), and the dihedral angle α between the third side surface 303 and the fourth surface 304 is an obtuse angle.

[0114] As shown in Figures 8 to 10, the display module may further include a frame 40, which surrounds the edge sealing adhesive 30 and is connected (e.g., bonded) to the first side 223 of the cover plate 20, the second side 302 of the edge sealing adhesive 30, and the fourth side 304 of the edge sealing adhesive 30. In this embodiment, each second side 302 is coplanar with a first side 223, which facilitates the connection of the frame 40 with the second side 302 and the first side 223. In addition, the frame 40 may also be connected to the third side 303. Since the dihedral angle between the third side 303 and the fourth side 304 is an obtuse angle, the contact area between the frame 40 and the third side 303 can be increased, and the connection between the two can be facilitated.

[0115] In some embodiments, the first surface 221 of the edge portion includes a plurality of first sub-surfaces, and the second surface 222 of the edge portion includes a plurality of second sub-surfaces. The first sub-surfaces and second sub-surfaces are connected to the first side surface 223 in a one-to-one correspondence. In some embodiments, at least one first sub-surface and the corresponding second sub-surface are curved. The first side surface 223 connected to the curved first sub-surface intersects the thickness direction of the display substrate 10, that is, the two are not parallel, but form a non-zero included angle between them.

[0116] This disclosure also provides a display device, which includes the display module described in the above embodiments.

[0117] The display device can include any device or product with display functionality. For example, the display device can be a smartphone, mobile phone, e-book reader, desktop computer (PC), laptop PC, netbook PC, personal digital assistant (PDA), portable multimedia player (PMP), digital audio player, mobile medical device, camera, wearable device (such as head-mounted devices, electronic clothing, electronic bracelets, electronic necklaces, electronic accessories, electronic tattoos, or smartwatches), etc.

[0118] This disclosure also provides an edge-sealing fixture 70, which is used in the manufacturing process of a display module, specifically for preparing an edge-sealing adhesive 30. Referring to Figures 4 and 6, the edge-sealing fixture 70 includes: a first baffle 71, a second baffle 72, a heating structure, and a curing structure 701. The first baffle 71 abuts against the edge portion 22 of the cover plate 20; the second baffle 72 abuts against the display substrate 10; the heating structure heats the solid adhesive 31 on the edge portion 22 to a preset temperature, so that the solid adhesive 31 is converted into a fluid adhesive 32. The curing structure 701 irradiates the fluid adhesive 32 in a fluid state with light of a preset wavelength, so that the fluid adhesive 32 is cured to form the edge-sealing adhesive 30. The orthographic projection of the formed edge-sealing adhesive 30 on the cover plate 20 overlaps with the orthographic projection of the display substrate 10 on the cover plate 20.

[0119] In some embodiments, the first baffle 71 and the second baffle 72 serve as heating structures to simplify structural design.

[0120] In some embodiments, the curing structure 701 further includes a mounting portion 73 connected between the first barrier wall 71 and the second barrier wall 72, and a curing lamp 74 disposed on the mounting portion 73. The curing lamp 74 is used to irradiate the fluid adhesive 32 with light of a preset wavelength, such as ultraviolet light.

[0121] In some embodiments, the mounting portion 73 is further provided with an exhaust port V1.

[0122] In some embodiments, the edge banding fixture 70 includes a plurality of first retaining walls 71 and a plurality of second retaining walls 72. The plurality of first retaining walls 71 form an annular structure, and the second retaining walls 72 are arranged opposite to the first retaining walls 71 in a one-to-one correspondence. The first retaining wall 71 includes a first shielding surface 711 and a second shielding surface 712 arranged opposite to each other along its thickness direction. The first shielding surface 711 is located on the side of the second shielding surface 712 close to the second retaining wall 72. The second retaining wall 72 includes a third shielding surface 723 facing the first retaining wall 71. The roughness of the first shielding surface 711 and the third shielding surface 723 is less than the roughness of the second shielding surface 712, so as to facilitate the demolding of the edge banding fixture 70.

[0123] In some embodiments, the edge portion 22 includes a first surface 221 facing the sealing adhesive 30, a second surface 222 opposite to the first surface 221, and a plurality of first side surfaces 223 connecting the first surface 221 and the second surface 222; different first side surfaces 223 are located on different sides of the edge portion 22. Each first barrier 71 of the sealing fixture 70 corresponds to one first side surface 223. The first barrier 71 includes a first shielding surface 711 facing the second barrier 72, the second barrier 72 includes a third shielding surface 723 facing the first barrier 71, and a support surface 721 connected to the third shielding surface 723. The dihedral angle between the support surface 721 and the third shielding surface 723 is an obtuse angle, so that when the second barrier 72 is supported on the display substrate 10 to prepare the sealing adhesive 30, the third side surface and the fourth side surface of the finally cured sealing adhesive 30 form an obtuse angle. The minimum dihedral angle γ between the extended surface of the support surface 721 and the first shielding surface 711 is equal to the minimum dihedral angle β between the extended surface of the first surface 221 and the extended surface of the first side surface 223, so that the second side surface of the finally cured sealing adhesive 30 is coplanar with the first side surface 223 of the cover plate 20.

[0124] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A method for manufacturing a display module, characterized in that, include: A cover plate is disposed on the light-emitting side of the display substrate, the cover plate including a main body portion opposite to the display substrate and an edge portion surrounding the main body portion; Solid adhesive is applied to the edge portion; A sealing fixture including a first retaining wall and a second retaining wall is provided, and the first retaining wall is abutted against the edge portion and the second retaining wall is abutted against the display substrate, so that the solid adhesive is located between the first retaining wall and the second retaining wall; The solid adhesive is heated to a preset temperature to convert it into a fluid adhesive, which then comes into contact with the display substrate, the edge portion, the first barrier wall, and the second barrier wall. Irradiate the fluid adhesive with light of a preset wavelength to cure it and form an edge-sealing adhesive; Separate the edge sealing fixture from the display substrate, the cover plate, and the edge sealing adhesive.

2. The manufacturing method according to claim 1, characterized in that, The step of heating the solid adhesive to a preset temperature includes: The solid adhesive is heated to a preset temperature using the first and second retaining walls.

3. The manufacturing method according to claim 1, characterized in that, The edge sealing fixture also includes an installation part connected between the first retaining wall and the second retaining wall, and a curing lamp is provided on the installation part; The step of irradiating the fluid adhesive with light of a predetermined wavelength includes: The curing lamp is used to irradiate the sealing adhesive in a fluid state with light of a preset wavelength.

4. The manufacturing method according to claim 1, characterized in that, The edge portion includes a first surface facing the solid adhesive, a second surface opposite to the first surface, and a plurality of first side surfaces connecting the first surface and the second surface, with different first side surfaces located on different sides of the edge portion; The edge sealing fixture includes a plurality of first retaining walls forming a ring structure. The first retaining walls correspond one-to-one with the first side. The first retaining wall includes a first shielding surface and a second shielding surface facing each other along its thickness direction. The first shielding surface is located on the side of the second shielding surface closer to the second retaining wall. In the step of abutting the first retaining wall against the edge portion, the first shielding surface is fitted to the corresponding first side surface.

5. The manufacturing method according to claim 4, characterized in that, The edge sealing fixture includes a plurality of second retaining walls, each of which is arranged opposite to the first retaining wall. Each second retaining wall includes a third shielding surface facing the first retaining wall and a supporting surface connected to the third shielding surface. The dihedral angle between the third shielding surface and the supporting surface is an obtuse angle. In the step of abutting the second barrier against the display substrate, the support surface is fitted to the display substrate.

6. The manufacturing method according to any one of claims 1 to 5, characterized in that, The orthographic projection of the sealing adhesive on the cover plate overlaps with the orthographic projection of the display substrate on the cover plate.

7. A display module, characterized in that, include: Display substrate; A cover plate is disposed on the light-emitting side of the display substrate, the cover plate including a main body portion opposite to the display substrate and an edge portion surrounding the main body portion; An edge sealing adhesive, at least a portion of which surrounds the display substrate and is bonded to the display substrate and the edge portion; The sealing adhesive can transform from a solid to a fluid when heated to a preset temperature, and can transform from a fluid to a solid when exposed to light of a preset wavelength.

8. The display module according to claim 7, characterized in that, The edge portion includes a first surface facing the edge sealant, a second surface opposite to the first surface, and a plurality of first side surfaces connecting the first surface and the second surface, with different first side surfaces located on different sides of the edge portion; The sealing adhesive has a ring-shaped structure and includes a third side facing the first surface, a fourth side facing away from the first surface, and a plurality of second side surfaces connecting the third side and the fourth surface. Different second side surfaces are located on different sides of the edge of the sealing adhesive away from the display substrate, and each second side surface is coplanar with one of the first side surfaces.

9. The display module according to claim 8, characterized in that, The first surface of the edge portion includes a plurality of first sub-surfaces, each of which is connected to a first side surface in a one-to-one correspondence. At least one of the first sub-surfaces is curved, and the first side surface to which the curved first sub-surface is connected intersects the thickness direction of the display substrate.

10. The display module according to claim 8, characterized in that, The edge sealing adhesive also includes multiple third side surfaces, which are connected between the fourth surface and the third surface; different third side surfaces are located on different sides of the edge sealing adhesive near the edge of the display substrate, and the dihedral angle between the third side surface and the fourth surface is an obtuse angle.

11. The display module according to any one of claims 6 to 10, characterized in that, The orthographic projection of the sealing adhesive on the cover plate overlaps with the orthographic projection of the display substrate on the cover plate.

12. A display device, characterized in that, The display module includes any one of claims 7 to 11.

13. An edge-sealing fixture, used in the manufacturing method of the display module according to any one of claims 1 to 6, characterized in that, The edge-sealing fixture includes: The first retaining wall is used to abut against the edge of the cover plate; The second barrier wall is used to abut against the display substrate; A heating structure is used to heat the solid adhesive on the edge portion to a preset temperature so that the solid adhesive is converted into a fluid adhesive. A curing structure is used to irradiate the fluid adhesive with light of a preset wavelength so that the fluid adhesive cures to form an edge-sealing adhesive.

14. The edge-sealing fixture according to claim 13, characterized in that, The first and second retaining walls serve as the heating structure; The curing structure includes a mounting part connected between the first retaining wall and the second retaining wall, and a curing lamp disposed on the mounting part, the curing lamp being used to emit light of a preset wavelength.

15. The edge-sealing fixture according to claim 14, characterized in that, The mounting section is also provided with an exhaust port.

16. The edge-sealing fixture according to claim 13, characterized in that, The edge sealing fixture includes multiple first retaining walls and multiple second retaining walls. The multiple first retaining walls form a ring structure, and the second retaining walls are arranged opposite to the first retaining walls in a one-to-one correspondence. The first retaining wall includes a first shielding surface and a second shielding surface disposed opposite to each other along its thickness direction. The first shielding surface is located on the side of the second shielding surface closer to the second retaining wall. The second retaining wall includes a third shielding surface facing the first retaining wall. The roughness of both the first and third shielding surfaces is less than that of the second shielding surface.

17. The edge-sealing fixture according to claim 13, characterized in that, The edge portion includes a first surface facing the solid adhesive, a second surface opposite to the first surface, and a plurality of first side surfaces connecting the first surface and the second surface; different first side surfaces are located on different sides of the edge portion; The edge sealing fixture includes multiple first retaining walls and multiple second retaining walls, each first retaining wall corresponding to one of the first side walls, and the second retaining walls are arranged opposite to the first retaining walls in a one-to-one correspondence; The first retaining wall includes a first shielding surface facing the second retaining wall, the second retaining wall includes a third shielding surface facing the first retaining wall, and a supporting surface connected to the third shielding surface; The dihedral angle between the supporting surface and the third shielding surface is an obtuse angle. The minimum dihedral angle between the extended surface of the supporting surface and the first shielding surface is equal to the minimum dihedral angle between the extended surface of the first surface and the extended surface of the first side surface.

18. The edge-sealing fixture according to claim 16, characterized in that, The first barrier wall includes a first metal barrier wall and a first ceramic layer located on the side of the first metal barrier wall near the second barrier wall, with the surface of the ceramic layer away from the first metal barrier wall serving as the first shielding surface; the second barrier wall includes a second metal barrier wall and a second ceramic layer located on the side of the second metal barrier wall near the second barrier wall, with the surface of the second ceramic layer away from the second metal barrier wall serving as the second shielding surface.

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