Display module, preparation method thereof and display device

Abstract

The application provides a display module, a preparation method thereof and a display device. The display module comprises a display substrate and a cover plate. The display side and the back side of the display substrate are oppositely arranged. The cover plate covers the display side of the display substrate. The display module further comprises an edge sealing structure which covers the edge end surface of the display substrate. The orthogonal projection of the edge sealing structure on the plane of the cover plate overlaps the orthogonal projection of the four peripheral edge regions of the cover plate and the four peripheral edge regions of the display substrate on the plane of the cover plate. The side surface of the edge sealing structure away from the display substrate and the side surface of the edge sealing structure away from the edge end surface of the display substrate are both flat. The display module can realize the direct bonding assembly between the edge sealing structure and the middle frame of the whole machine, thereby improving the packaging reliability of the display module and reducing the frame of the whole machine using the display module.

Description

Technical Field

[0001] This invention belongs to the field of display, specifically relating to a display module, its manufacturing method, and a display device. Background Technology

[0002] Currently, with the rapid development of the OLED (Organic Light-Emitting Diode) display industry, the requirements for high strength and drop resistance are becoming increasingly stringent.

[0003] Traditional OLED display modules have a glass cover (CG) protecting the front (display surface) and a foam copper foil protecting the back, but the sides (edges) of OLED display modules are not protected, making them extremely easy to damage in some mechanical and environmental tests. Summary of the Invention

[0004] This invention addresses the problems of low reliability and large overall bezel of display modules with side-sealing as described above, by providing a display module, its manufacturing method, and a display device. This display module enables direct surface-to-surface bonding assembly between the edge-sealing structure and the overall frame, thereby not only improving the packaging reliability of the display module but also reducing the overall bezel size of devices using this display module.

[0005] This invention provides a display module, including a display substrate and a cover plate, wherein the display side and the back side of the display substrate are disposed opposite to each other, and the cover plate covers the display side of the display substrate.

[0006] It also includes an edge sealing structure that covers the edge end face of the display substrate, and the orthographic projection of the encapsulation structure on the plane where the cover plate is located overlaps with the orthographic projections of the four peripheral edge areas of the cover plate and the four peripheral edge areas of the display substrate on the plane where the cover plate is located.

[0007] The side surface of the edge sealing structure facing away from the display substrate and the side surface facing away from the edge of the display substrate are both planar.

[0008] In some embodiments, the edge sealing structure contacts the side surface of the cover plate closest to the display substrate, and the orthographic projection of the edge sealing structure onto the plane of the cover plate is located within the orthographic projection area of ​​the cover plate onto its plane.

[0009] In some embodiments, the display substrate includes a display screen, a back plate, and a back film, wherein the display screen, the back plate, and the back film are sequentially stacked on one side of the cover plate.

[0010] The display screen has a bonding portion that is bent to the back side of the back film away from the cover plate and fixed to the back side of the back film.

[0011] The edge sealing structure contacts the side surface of the bonding part of the display screen that is away from the cover plate;

[0012] On the other side edges of the display substrate, the sealing structure contacts the side surface of the back film facing away from the cover plate.

[0013] In some embodiments, a gap is formed between the bent portion of the bonding portion of the display screen and the corresponding side edge end face of the back plate and the back film, and the gap is filled with the material of the sealing structure.

[0014] In some embodiments, the edge sealing structure uses a thermosetting adhesive or a light-curing adhesive.

[0015] The present invention also provides a display device including the above-described display module.

[0016] The present invention also provides a method for manufacturing the above-mentioned display module, comprising separately manufacturing a display substrate and a cover plate, fitting the cover plate onto the display side of the display substrate, and further comprising manufacturing an edge sealing structure.

[0017] The preparation of the edge sealing structure includes: setting a limiting frame on the back side of the display substrate, forming a limiting groove in the limiting frame, and the position of the limiting groove corresponding to the formation position of the edge sealing structure;

[0018] The liquid material forming the sealing structure is filled into the limiting groove;

[0019] The liquid material of the sealing structure is cured;

[0020] Remove the aforementioned limiting frame.

[0021] In some embodiments, the limiting groove is a hollow pattern formed in the limiting frame, and the limiting groove is formed by a first structure and a second structure.

[0022] The first structure is located on the back side of the display substrate, and the orthographic projection of the first structure on the plane where the cover plate is located is located within the orthographic projection area of ​​the display substrate on the plane where the cover plate is located. The distance between the orthographic projection of the first structure on the plane where the cover plate is located and the edge of the orthographic projection of the display substrate on the plane where the cover plate is located is greater than 0.

[0023] The second structure surrounds the periphery of the cover plate, and the orthographic projection of the second structure on the plane where the cover plate is located surrounds the periphery of the orthographic projection of the cover plate on its plane. The second structure is in contact with the four edge end faces of the cover plate.

[0024] In some embodiments, the first structure is plate-shaped, and the first structure and the display substrate have the same orthographic projection shape on the plane where the cover plate is located;

[0025] Alternatively, the first structure is a closed ring, and the orthographic projection shape of the first structure on the plane where the cover plate is located is the same as the orthographic projection outline of the display substrate on the plane where the cover plate is located.

[0026] In some embodiments, a lubricant is applied to adjacent and opposite surfaces of the first and second structures, the lubricant facilitating separation between the first and second structures and the edge sealing structure.

[0027] In some embodiments, filling the limiting groove with the liquid material forming the sealing structure includes:

[0028] The liquid material forming the sealing structure is filled into the limiting groove by means of injection, dot coating, scraping or 3D printing;

[0029] The curing of the liquid material of the edge sealing structure includes: curing the liquid material of the edge sealing structure by heating or photocuring.

[0030] In some embodiments, fabricating the display substrate includes fabricating a backplate;

[0031] A display screen is fabricated on one side of the back panel;

[0032] A back film is attached to the side of the back panel opposite to the display screen;

[0033] The liquid material of the sealing structure is applied to the side of the bonding part of the display screen that is to be bent, near the back plate, by dripping or injection.

[0034] The mounting part of the display screen is bent to the back side of the back film away from the back plate and fixed to the back side of the back film;

[0035] The liquid material of the sealing structure is cured by heating or photocuring.

[0036] In some embodiments, the number of the limiting grooves is multiple, and the multiple limiting grooves are arranged in an array.

[0037] The present invention also provides a method for manufacturing the above-mentioned display module, comprising separately manufacturing a display substrate and a cover plate, fitting the cover plate onto the display side of the display substrate to form an intermediate product of the display module, and further comprising manufacturing an edge sealing structure.

[0038] The preparation of the edge sealing structure includes: placing the intermediate product of the display module into a container with an opening on one side, and setting a light shield above the opening of the container, the light shield covering the opening of the container; the light shield has a hollow pattern, the position of the hollow pattern corresponding to the formation position of the edge sealing structure;

[0039] The liquid material that forms the sealing structure is added to the container;

[0040] The liquid material of the edge sealing structure corresponding to the hollow pattern is cured by the hollow pattern;

[0041] The completed display module is taken out of the container.

[0042] In some embodiments, adding the liquid material forming the sealing structure to the container includes:

[0043] The liquid material forming the sealing structure is added to the container in N increments. Each time the liquid material is added, the liquid level in the container rises by 1 / N of the thickness of the sealing structure.

[0044] The process of curing the liquid material of the edge-sealing structure corresponding to the hollow pattern through the hollow pattern includes:

[0045] The liquid material of the edge sealing structure is cured in N stages, corresponding to the hollowed-out pattern area. Each time the liquid material is added, the liquid material of the edge sealing structure corresponding to the hollowed-out pattern area is cured once.

[0046] The beneficial effects of the present invention are as follows: The display module provided by the present invention makes the side surface of the edge sealing structure away from the display substrate and the side surface of the edge sealing structure away from the edge end face of the display substrate both flat, which enables direct surface bonding and assembly between the edge sealing structure and the frame of the whole machine. This not only improves the packaging reliability of the display module, but also reduces the frame of the whole machine using the display module.

[0047] The method for manufacturing a display module provided by this invention, on the one hand, ensures that both the surface of the edge-sealing structure facing away from the display substrate and the surface facing away from the edge of the display substrate are flat, thereby enabling direct surface-to-surface bonding and assembly between the edge-sealing structure and the frame of the entire device. This not only improves the packaging reliability of the display module but also reduces the overall bezel size of the device using the display module. On the other hand, this manufacturing method controls the filling position of the liquid material in the edge-sealing structure through a limiting frame, which relaxes the precision requirements for the placement of the liquid material in the edge-sealing structure and improves the packaging quality of the edge of the display substrate. This manufacturing method is simple, easy to implement, efficient, and convenient.

[0048] The display device provided by the present invention improves the packaging reliability and reduces the overall bezel of the display device by adopting the above-mentioned display module. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the packaging on the side of an OLED display module in related technologies;

[0050] Figure 2 This is a schematic diagram illustrating the assembly of an OLED display module and its mid-frame in related technologies.

[0051] Figure 3a This is a cross-sectional view of the display module in an embodiment of the present invention;

[0052] Figure 3b This is a partial cross-sectional view of the assembly structure of the display module and the middle frame in an embodiment of the present invention;

[0053] Figure 4a This is a structural cross-sectional schematic diagram of a method for manufacturing a display module according to an embodiment of the present invention;

[0054] Figure 4b This is a top view schematic diagram of a manufacturing method process for a display module in an embodiment of the present invention;

[0055] Figure 4c This is a partial cross-sectional view of the assembly of the display module and the limiting frame in an embodiment of the present invention;

[0056] Figure 4d This is a schematic diagram illustrating the process of filling the gap between the bent portion of the display screen's bonding part and the corresponding side edge end faces of the back plate and back film with sealing material in an embodiment of the present invention.

[0057] Figure 5 This is a structural cross-sectional schematic diagram of another method for manufacturing a display module in an embodiment of the present invention.

[0058] The reference numerals in the attached figures are:

[0059] 1. Display substrate; 11. Display screen; 11a. Bonding part; 11b. Gap; 12. Back plate; 13. Back film; 2. Cover plate; 3. Edge sealing structure; 30. Liquid material; 4. Middle frame; 5. Transparent optical adhesive; 6. Limiting frame; 60. Limiting groove; 601. First structure; 602. Second structure; 7. Container; 8. Light shield; 80. Hollow pattern; 9. Encapsulating adhesive. Detailed Implementation

[0060] To enable those skilled in the art to better understand the technical solution of the present invention, a display module, its preparation method, and display device of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0061] In related technologies, such as Figure 1 As shown, a ring of encapsulating adhesive 9 can be applied to the side of the OLED display module (i.e., the edge of the display substrate 1 in the display module) to protect the side of the display module.

[0062] Figure 1 The shown packaging method for the side of the display module, while improving its reliability, results in a "hill-like" shape from the applied adhesive, which is difficult to control and hinders assembly with the entire device. Figure 2 As shown, the display module after glue application is assembled with the mid-frame 4 of the whole machine. The mid-frame 4 needs to reserve a large space to avoid the glue mound. The overall reliability of the display module is low and the frame of the whole machine is large.

[0063] To address the issues of low reliability and large overall bezel of display modules with the aforementioned side-encapsulation, embodiments of the present invention provide a display module, such as... Figure 3a and Figure 3b As shown, the device includes a display substrate 1 and a cover plate 2. The display side and back side of the display substrate 1 are arranged opposite to each other. The cover plate 2 covers the display side of the display substrate 1. The device also includes an edge sealing structure 3, which covers the edge end face of the display substrate 1. The orthographic projection of the sealing structure 3 on the plane of the cover plate 2 overlaps with the orthographic projection of the four-sided edge area of ​​the cover plate 2 and the four-sided edge area of ​​the display substrate 1 on the plane of the cover plate 2. The side surface of the edge sealing structure 3 facing away from the display substrate 1 and the side surface facing away from the edge end face of the display substrate 1 are both planar.

[0064] In this embodiment, as Figure 3b As shown, by making the side surface of the edge sealing structure 3 facing away from the display substrate 1 and the side surface facing away from the edge end face of the display substrate 1 both flat, the edge sealing structure 3 and the frame 4 of the whole machine can be directly bonded and assembled, thereby not only improving the packaging reliability of the display module, but also reducing the frame of the whole machine using the display module.

[0065] In some embodiments, the edge sealing structure 3 contacts the side surface of the cover plate 2 closest to the display substrate 1, and the orthographic projection of the edge sealing structure 3 on the plane of the cover plate 2 is located within the orthographic projection area of ​​the cover plate 2 on its plane.

[0066] In this configuration, the area of ​​the surface of the cover plate 2 closest to the display substrate 1 is larger than the area of ​​the surface of the display substrate 1 closest to the cover plate 2. After the cover plate 2 and the display substrate 1 are stacked, the perimeter of the cover plate 2 does not overlap with the display substrate 1. The cover plate 2 and the display substrate 1 are bonded together using transparent optical adhesive 5. The edge sealing structure 3 contacts the perimeter of the surface of the cover plate 2 closest to the display substrate 1. The perimeter of the cover plate 2 is the area where the cover plate 2 does not overlap with the display substrate 1.

[0067] In some embodiments, the display substrate 1 includes a display screen 11, a back plate 12, and a back film 13. The display screen 11, back plate 12, and back film 13 are stacked sequentially on one side of the cover plate 2. The display screen 11 has a bonding portion 11a, which is bent to the back side of the back film 13 away from the cover plate 2 and fixed to the back side of the back film 13. The sealing structure 3 contacts the surface of the bonding portion 11a of the display screen 11 away from the cover plate 2. On other side edges of the display substrate 1, the sealing structure 3 contacts the surface of the back film 13 away from the cover plate 2. This arrangement enables the sealing structure 3 to form good encapsulation and protection for the four peripheral edge surfaces of the display substrate 1, preventing damage to the four peripheral edge surfaces of the display substrate 1 during mechanical and environmental tests. The back side of the back film 13 refers to the side of the back film 13 away from the cover plate 2.

[0068] In some embodiments, the display screen 11 may be a flexible OLED display screen, and the bonding portion 11a of the flexible OLED display screen can be bent to the back side of the back film 13 so as to bond and connect with the peripheral circuit located on the back side of the back film 13.

[0069] In some embodiments, the back film 13 includes structures such as heat dissipation copper foil and foam. The back film 13 is a traditional heat dissipation protection structure disposed on the back side of the display screen 11, which will not be described in detail here.

[0070] In some embodiments, such as Figure 3a As shown, a gap 11b is formed between the bent portion of the bonding part 11a of the display screen 11 and the corresponding side edge end face of the back plate 12 and the back film 13, and the gap 11b is filled with the material of the sealing structure 3.

[0071] The bent portion of the bonding portion 11a of the display screen 11 covers the corresponding side edge faces of the back plate 12 and the back film 13. By filling the gap 11b with the material of the sealing structure 3, a good seal can be formed on the edge faces of the back plate 12 and the back film 13 covered by the bent portion of the bonding portion 11a of the display screen 11, preventing the edge faces of the back plate 12 and the back film 13 from being damaged in mechanical and environmental tests.

[0072] In some embodiments, the edge sealing structure 3 is made of thermosetting adhesive or light-curing adhesive.

[0073] In some embodiments, thermosetting adhesive materials such as epoxy resins are used. Photocurable materials such as acrylic or epoxy resins are also used.

[0074] The display module provided in this embodiment of the invention enables direct surface bonding assembly between the edge sealing structure and the frame of the whole machine by making both the side surface of the edge sealing structure facing away from the display substrate and the side surface of the edge sealing structure facing away from the edge end face of the display substrate flat. This not only improves the packaging reliability of the display module, but also reduces the overall bezel of the machine using the display module.

[0075] Based on the above structure of the display module, this embodiment of the invention also provides a method for manufacturing the display module, such as... Figure 4a and Figure 4b As shown, the method includes step S101: preparing a display substrate 1 and a cover plate 2 respectively, and covering the display side of the display substrate 1 with the cover plate 2. It also includes preparing an edge sealing structure 3. Preparing the edge sealing structure 3 includes step S102: setting a limiting frame 6 on the back side of the display substrate 1, forming a limiting groove 60 in the limiting frame 6, and the position of the limiting groove 60 corresponding to the formation position of the edge sealing structure 3.

[0076] Step S103: Fill the limiting groove 60 with the liquid material that forms the sealing structure 3;

[0077] Step S104: Curing the liquid material of the edge sealing structure 3;

[0078] Step S105: Remove the limiting frame.

[0079] The liquid material forming the sealing structure 3 can be either a thinner liquid or a more viscous liquid.

[0080] The fabrication method of this display module ensures that both the surface of the edge sealing structure 3 facing away from the display substrate 1 and the surface of the edge sealing structure 3 facing away from the edge end face of the display substrate 1 are flat. This enables direct surface bonding and assembly between the edge sealing structure 3 and the frame of the whole machine, which not only improves the packaging reliability of the display module but also reduces the overall frame of the machine using this display module. On the other hand, the fabrication method controls the filling position of the liquid material in the edge sealing structure 3 through the limiting frame 6, which relaxes the precision requirements for the setting position of the liquid material in the edge sealing structure 3 and improves the packaging quality of the edge end face of the display substrate 1. This fabrication method is simple, easy to implement, efficient and convenient.

[0081] In some embodiments, such as Figure 4cAs shown, the limiting groove 60 is a hollow pattern formed in the limiting frame 6. The limiting groove 60 is formed by the first structure 601 and the second structure 602. The first structure 601 is located on the back side of the display substrate 1, and the orthographic projection of the first structure 601 on the plane of the cover plate 2 is located within the orthographic projection area of ​​the display substrate 1 on the plane of the cover plate 2. The distance s between the orthographic projection of the first structure 601 on the plane of the cover plate 2 and the edge of the orthographic projection of the display substrate 1 on the plane of the cover plate 2 is greater than 0. The second structure 602 surrounds the periphery of the cover plate 2, and the orthographic projection of the second structure 602 on the plane of the cover plate 2 surrounds the periphery of the orthographic projection of the cover plate 2 on its plane. The second structure 602 is in contact with the four edges of the cover plate 2.

[0082] Here, the back side of the display substrate 1 refers to the side of the display substrate 1 that is away from the cover plate 2. The distance s between the orthographic projection of the first structure 601 on the plane of the cover plate 2 and the edge of the orthographic projection of the display substrate 1 on the plane of the cover plate 2 is greater than 0. This ensures that the final edge sealing structure 3 not only covers the edge end face of the display substrate 1, but also covers the edge area of ​​the back side of the display substrate 1. This makes the edge sealing structure 3 more firmly and stably covering the edge end face of the display substrate 1, thereby further improving the packaging reliability of the display module.

[0083] In some embodiments, the distance s between the orthographic projection of the first structure 601 on the plane of the cover plate 2 and the edge of the orthographic projection of the display substrate 1 on the plane of the cover plate 2 can be any one of 0.7mm, 0.8mm, 0.9mm, 1mm, and 1.1mm.

[0084] In some embodiments, such as Figure 4c As shown, the first structure 601 is tightly attached to the back surface of the back film 13 in the display substrate 1, and the second structure 602 is tightly attached to the edge end face of the cover plate 2. The first structure 601, the second structure 602 and the display substrate 1 form a U-shaped space, which is the position to be filled with the liquid material that forms the sealing structure 3.

[0085] In some embodiments, such as Figure 4a As shown, the first structure 601 is plate-shaped, and the first structure 601 and the display substrate 1 have the same orthographic projection shape on the plane where the cover plate 2 is located. That is, the first structure 601 covers the entire area of ​​the back surface of the display substrate 1 except for the area where the edge sealing structure 3 is set.

[0086] In some embodiments, such as Figure 4b As shown, the first structure 601 is a closed ring, and the orthographic projection shape of the first structure 601 on the plane where the cover plate 2 is located is the same as the orthographic projection outline of the display substrate 1 on the plane where the cover plate 2 is located. That is, the first structure 601 only covers the perimeter of the area outside the sealing structure 3 area on the back surface of the display substrate 1.

[0087] In some embodiments, a lubricant is applied to the adjacent and opposite surfaces of the first structure 601 and the second structure 602, which can assist in the separation of the first structure 601 and the second structure 602 from the edge sealing structure 3.

[0088] Among them, lubricants such as silicone oil can facilitate the separation between the first structure 601 and the second structure 602 and the subsequently cured edge sealing structure 3, thereby allowing the limiting frame 6 to be smoothly separated from the edge sealing structure 3, and thus allowing the limiting frame 6 to be smoothly removed from the back side of the display substrate 1.

[0089] In some embodiments, step S103: filling the liquid material forming the edge sealing structure 3 into the limiting groove 60 includes: filling the liquid material forming the edge sealing structure 3 into the limiting groove 60 by means of injection, dot coating, scraping or 3D printing; step S104: curing the liquid material of the edge sealing structure 3 includes: curing the liquid material of the edge sealing structure 3 by means of heating or light curing.

[0090] The liquid material for the sealing structure 3 can be a thermosetting adhesive, such as one heated to around 60°C, which generally will not damage the circuit structure on the back side of the display substrate 1. Alternatively, the liquid material for the sealing structure 3 can be a photocurable adhesive, such as one cured with UV light.

[0091] In some embodiments, such as Figure 4d As shown, the preparation of the display substrate 1 includes step S1011: preparing a back plate 12; preparing a display screen 11 on one side of the back plate 12; and attaching a back film 13 to the side of the back plate 12 opposite to the display screen 11.

[0092] Step S1012: Apply liquid material 30 of sealing structure 3 to the side of the bendable part of the binding part 11a of the display screen 11 near the back plate 12 by dripping or injection.

[0093] Step S1013: Bend the bonding part 11a of the display screen 11 to the back side of the back film 13 away from the back plate 12 and fix it to the back side of the back film 13; cure the liquid material 30 of the sealing structure 3 by heating or photocuring.

[0094] The above-described process for preparing the display substrate 1 can form a good encapsulation of the edge face of the back plate 12 and the back film 13 covering the bent portion of the bonding portion 11a of the display screen 11, preventing the edge face of the back plate 12 and the back film 13 from being damaged in mechanical and environmental tests.

[0095] In some embodiments, refer to Figure 4a and Figure 4bThe limiting slots 60 are multiple and arranged in an array. That is, multiple limiting slots 60 can be designed in the limiting frame 6, and each limiting slot 60 corresponds to the edge end face of a display substrate 1 for encapsulation. Thus, the limiting frame 6 is a multi-packaging station design, which improves packaging efficiency. Moreover, the limiting frame 6 is reusable, which is efficient and convenient.

[0096] Based on the display module structure in the above embodiments, this invention also provides a method for manufacturing a display module, such as... Figure 5 As shown, step S201 includes preparing a display substrate 1 and a cover plate 2 respectively, and covering the display side of the display substrate 1 with the cover plate 2 to form an intermediate product of the display module;

[0097] It also includes the preparation of an edge sealing structure, which includes: step S202: placing the intermediate product of the display module into a container 7 with an opening on one side, and setting a light shield 8 above the opening of the container 7 to cover the opening of the container 7; the light shield 8 has a hollow pattern 80, and the position of the hollow pattern 80 corresponds to the formation position of the edge sealing structure 3.

[0098] Step S203: Add liquid material 30 to container 7 to form sealing structure 3;

[0099] Step S204: The liquid material 30 of the edge sealing structure 3 is cured in the area corresponding to the hollow pattern 80 through the hollow pattern 80;

[0100] Step S205: Remove the prepared display module from container 7.

[0101] The liquid material forming the sealing structure 3 can be in a relatively dilute liquid state.

[0102] In some embodiments, UV light is irradiated into the perforated pattern 80 to cure the liquid material 30 of the sealing structure 3. The liquid material 30 in the areas irradiated by UV light is cured and formed, while the liquid material 30 in the unirradiated areas remains liquid. After curing, the product is removed to obtain the desired encapsulated display module.

[0103] The fabrication method of this display module ensures that both the surface of the edge sealing structure 3 facing away from the display substrate 1 and the surface of the edge sealing structure 3 facing away from the edge end face of the display substrate 1 are flat. This enables direct surface bonding and assembly between the edge sealing structure 3 and the frame of the whole machine, which not only improves the packaging reliability of the display module but also reduces the overall frame of the machine using this display module. On the other hand, the fabrication method controls the filling position of the liquid material in the edge sealing structure 3 through the limiting frame 6, which relaxes the precision requirements for the setting position of the liquid material in the edge sealing structure 3 and improves the packaging quality of the edge end face of the display substrate 1. This fabrication method is simple, easy to implement, efficient and convenient.

[0104] In some embodiments, step S203: adding liquid material 30 to the container 7 to form the sealing structure 3 includes:

[0105] Liquid material 30 forming the sealing structure 3 is added to container 7 in N increments. Each time liquid material 30 is added, the liquid level of liquid material 30 in container 7 rises by 1 / N of the thickness of sealing structure 3.

[0106] Step S204: Curing the area of ​​the liquid material 30 of the edge sealing structure 3 corresponding to the hollow pattern 80 through the hollow pattern 80, including:

[0107] The liquid material 30 of the edge sealing structure 3 is cured in N stages, corresponding to the hollow pattern 80. Each time liquid material 30 is added, the corresponding hollow pattern 80 of liquid material 30 of the edge sealing structure 3 is cured once.

[0108] In some embodiments, the liquid material 30 of the sealing structure 3 is easily affected by the UV curing depth. The liquid material 30 can be added and cured in N stages. For example, the curing depth of UV light within 30-50 seconds is 0.3-0.5 mm. Due to the poor light transmittance of the liquid material 30, the curing depth after more than 50 seconds of UV light is still 0.3-0.5 mm. Generally, mobile phone display modules require the sealing structure 3 to have a thickness of 1.2 mm. Since the depth of UV light curing of the liquid material 30 in a single step is 0.3 mm, it can be cured in four stages. First, 0.3 mm of liquid material 30 is added to the container 7 and cured once; then, liquid material 30 is added to a depth of 0.6 mm and cured a second time, until the required encapsulation thickness of the sealing structure 3 is achieved.

[0109] In some embodiments, the liquid material 30 of the sealing structure 3 added to the container 7 can automatically flow into the gap formed between the bent portion of the bonding part of the display screen 11 and the corresponding side edge end faces of the back plate 12 and the back film 13 in the display substrate 1, eliminating the need to fill the gap using the material filling process of the sealing structure 3 in the previous preparation method embodiment. In the preparation method of this embodiment, the material of the sealing structure 2 that automatically flows into the gap can also form a good seal for the edge end faces of the back plate 12 and the back film 13 covered by the bent portion of the bonding part 11a of the display screen 11 after subsequent curing, preventing the edge end faces of the back plate 12 and the back film 13 from being damaged in mechanical and environmental tests.

[0110] The method for manufacturing a display module provided in this invention has two advantages. First, it ensures that both the surface of the edge-sealing structure facing away from the display substrate and the surface facing away from the edge of the display substrate are flat, thereby enabling direct surface-to-surface bonding and assembly between the edge-sealing structure and the frame of the entire device. This not only improves the packaging reliability of the display module but also reduces the overall bezel size of the device using the display module. Second, the method controls the filling position of the liquid material in the edge-sealing structure through a limiting frame, which relaxes the precision requirements for the liquid material placement and improves the packaging quality of the edge of the display substrate. This method is simple, easy to implement, efficient, and convenient.

[0111] This invention also provides a display device, including the display module described in the above embodiments.

[0112] By adopting the display module in the above embodiments, the packaging reliability of the display device is improved and the overall bezel of the display device is reduced.

[0113] The display device can be any product or component with display function, such as an OLED panel, OLED TV, e-paper, mobile phone, tablet computer, laptop computer, monitor, digital photo frame, navigator, etc.

[0114] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for manufacturing a display module, the display module comprising a display substrate and a cover plate, wherein the display side and the back side of the display substrate are disposed opposite to each other, and the cover plate covers the display side of the display substrate. Its features are, It also includes an edge sealing structure that covers the edge end face of the display substrate, and the orthographic projection of the edge sealing structure on the plane where the cover plate is located overlaps with the orthographic projections of the four-sided edge area of ​​the cover plate and the four-sided edge area of ​​the display substrate on the plane where the cover plate is located. The side surface of the sealing structure facing away from the display substrate and the side surface facing away from the edge end face of the display substrate are both planar. The manufacturing method includes separately manufacturing the display substrate and the cover plate, fitting the cover plate onto the display side of the display substrate, and further includes manufacturing an edge sealing structure. The preparation of the edge sealing structure includes: setting a limiting frame on the back side of the display substrate, forming a limiting groove in the limiting frame, and the position of the limiting groove corresponding to the formation position of the edge sealing structure; The liquid material forming the sealing structure is filled into the limiting groove; The liquid material of the sealing structure is cured; Remove the aforementioned limiting frame; The limiting groove is a hollow pattern formed in the limiting frame, and the limiting groove is formed by the first structure and the second structure. The adjacent and opposite surfaces of the first structure and the second structure are coated with a lubricant, which can assist in the separation of the first structure and the second structure from the edge sealing structure; The number of the limiting grooves is multiple, and the multiple limiting grooves are arranged in an array; or, The manufacturing method includes separately manufacturing the display substrate and the cover plate, fitting the cover plate onto the display side of the display substrate to form an intermediate product of the display module, and further includes manufacturing an edge sealing structure. The preparation of the edge sealing structure includes: placing the intermediate product of the display module into a container with an opening on one side, and setting a light shield above the opening of the container, the light shield covering the opening of the container; the light shield has a hollow pattern, the position of the hollow pattern corresponding to the formation position of the edge sealing structure; The liquid material that forms the sealing structure is added to the container; The liquid material of the edge sealing structure corresponding to the hollow pattern is cured by the hollow pattern; The completed display module is removed from the container; The addition of the liquid material forming the sealing structure to the container includes: The liquid material forming the sealing structure is added to the container in N increments. Each time the liquid material is added, the liquid level in the container rises by 1 / N of the thickness of the sealing structure. The process of curing the liquid material of the edge-sealing structure corresponding to the hollow pattern through the hollow pattern includes: The liquid material of the edge sealing structure is cured in N stages, corresponding to the hollowed-out pattern area. Each time the liquid material is added, the liquid material of the edge sealing structure corresponding to the hollowed-out pattern area is cured once.

2. The method for preparing a display module according to claim 1, characterized in that, The first structure is located on the back side of the display substrate, and the orthographic projection of the first structure on the plane where the cover plate is located is located within the orthographic projection area of ​​the display substrate on the plane where the cover plate is located. The distance between the orthographic projection of the first structure on the plane where the cover plate is located and the edge of the orthographic projection of the display substrate on the plane where the cover plate is located is greater than 0. The second structure surrounds the periphery of the cover plate, and the orthographic projection of the second structure on the plane where the cover plate is located surrounds the periphery of the orthographic projection of the cover plate on its plane. The second structure is in contact with the four edge end faces of the cover plate.

3. The method for preparing a display module according to claim 2, characterized in that, The first structure is plate-shaped, and the first structure and the display substrate have the same orthographic projection shape on the plane where the cover plate is located; Alternatively, the first structure is a closed ring, and the orthographic projection shape of the first structure on the plane where the cover plate is located is the same as the orthographic projection outline of the display substrate on the plane where the cover plate is located.

4. The method for preparing a display module according to claim 1, characterized in that, The step of filling the limiting groove with the liquid material forming the sealing structure includes: The liquid material forming the sealing structure is filled into the limiting groove by means of injection, dot coating, scraping or 3D printing; The curing of the liquid material of the edge sealing structure includes: curing the liquid material of the edge sealing structure by heating or photocuring.

5. The method for manufacturing a display module according to claim 1, characterized in that, The fabrication of the display substrate includes the fabrication of a backplate; A display screen is fabricated on one side of the back panel; A back film is attached to the side of the back panel opposite to the display screen; The liquid material of the sealing structure is applied to the side of the bonding part of the display screen that is to be bent, near the back plate, by dripping or injection. The mounting part of the display screen is bent to the back side of the back film away from the back plate and fixed to the back side of the back film; The liquid material of the sealing structure is cured by heating or photocuring.

6. A display module, wherein the display module is manufactured using the manufacturing method according to any one of claims 1-5, the display module comprising a display substrate and a cover plate, wherein the display side and the back side of the display substrate are disposed opposite to each other, and the cover plate covers the display side of the display substrate. Its features are, It also includes an edge sealing structure that covers the edge end face of the display substrate, and the orthographic projection of the edge sealing structure on the plane where the cover plate is located overlaps with the orthographic projections of the four-sided edge area of ​​the cover plate and the four-sided edge area of ​​the display substrate on the plane where the cover plate is located. The side surface of the edge sealing structure facing away from the display substrate and the side surface facing away from the edge of the display substrate are both planar.

7. The display module according to claim 6, characterized in that, The edge sealing structure contacts the side surface of the cover plate closest to the display substrate, and the orthographic projection of the edge sealing structure on the plane of the cover plate is located within the orthographic projection area of ​​the cover plate on its plane.

8. The display module according to claim 7, characterized in that, The display substrate includes a display screen, a back plate, and a back film, wherein the display screen, the back plate, and the back film are stacked sequentially on one side of the cover plate. The display screen has a bonding portion that is bent to the back side of the back film away from the cover plate and fixed to the back side of the back film. The edge sealing structure contacts the side surface of the bonding part of the display screen that is away from the cover plate; On the other side edges of the display substrate, the sealing structure contacts the side surface of the back film facing away from the cover plate.

9. The display module according to claim 8, characterized in that, The bent portion of the display screen's bonding part forms a gap between the corresponding side edge end face of the back plate and the back film, and the gap is filled with the material of the sealing structure.

10. The display module according to any one of claims 6-9, characterized in that, The edge sealing structure uses thermosetting adhesive or light-curing adhesive.

11. A display device, characterized in that, Includes the display module as described in any one of claims 6-10.

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