Display module, preparation method thereof and display device

Abstract

The invention 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, and the display module further comprises an edge sealing structure covering the edge end face of the display substrate. The orthographic projection of the packaging structure on the plane where the cover plate is located is overlapped with the orthographic projection of the peripheral edge area of the cover plate and the peripheral edge area of the display substrate on the plane where the cover plate is located, and the surface of the side, away from the display substrate, of the edge sealing structure and the surface of the side, away from the edge end face of the display substrate, of the edge sealing structure are both planes. According to the display module, the face-to-face direct bonding assembly between the edge sealing structure and the whole machine middle frame can be realized, so that the packaging reliability of the display module is improved, and the whole machine frame adopting the display module is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of display, and in particular relates to a display module and a preparation method thereof, and a display device. Background Art

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

[0003] The front side (display surface) of the traditional OLED display module is protected by a glass cover (CG) and the back side is protected by a foam copper foil, but the sides (edge ​​faces) of the OLED display module are not protected and are easily damaged in some mechanical and environmental tests. Summary of the invention

[0004] The present invention aims to solve the problem that the display module with the above-mentioned side packaging has low reliability and a large frame of the whole machine, and provides a display module and a preparation method thereof and a display device. The display module can realize the surface-to-surface direct bonding assembly between the edge sealing structure and the whole machine middle frame, thereby not only improving the packaging reliability of the display module, but also reducing the frame of the whole machine using the display module.

[0005] The present invention provides a display module, comprising a display substrate and a cover plate, wherein a display side and a back side of the display substrate are arranged opposite to each other, and the cover plate covers the display side of the display substrate.

[0006] It also includes an edge sealing structure, covering the edge end surface of the display substrate, and the orthographic projection of the packaging structure on the plane where the cover plate is located overlaps with the orthographic projections of the peripheral edge area of ​​the cover plate and the peripheral edge area of ​​the display substrate on the plane where the cover plate is located.

[0007] A surface of the edge sealing structure on one side facing away from the display substrate and a surface of the side facing away from the edge end face of the display substrate are both planes.

[0008] In some embodiments, the edge sealing structure contacts a surface of the cover plate close to the display substrate, and an orthographic projection of the edge sealing structure on the plane where the cover plate is located is located within an orthographic projection area of ​​the cover plate on the plane where the cover plate is located.

[0009] In some embodiments, the display substrate includes a display screen, a back plate and a back film, and 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 binding portion, and the binding portion of the display screen 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 is in contact with a surface of a side of the binding portion of the display screen that is away from the cover plate;

[0012] At other side edges of the display substrate, the edge sealing structure is in contact with a surface of the back film that is away from the cover plate.

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

[0014] In some embodiments, the edge sealing structure is made of heat-curing adhesive material or light-curing adhesive material.

[0015] The present invention also provides a display device, comprising the above display module.

[0016] The present invention also provides a method for preparing the above display module, comprising preparing a display substrate and a cover plate respectively, covering the cover plate on the display side of the display substrate, and preparing an edge sealing structure.

[0017] Preparing the edge sealing structure includes: arranging 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 corresponds to the formation position of the edge sealing structure;

[0018] Filling the liquid material forming the edge sealing structure into the limiting groove;

[0019] Solidifying the liquid material of the edge sealing structure;

[0020] The limiting frame is removed.

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

[0022] The first structure is located at 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, and 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 the plane where the cover plate is located, and the second structure contacts the peripheral edge end surfaces of the cover plate.

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

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

[0026] In some embodiments, a lubricant is coated on adjacent and opposite surfaces of the first structure and the second structure, and the lubricant can assist in the separation of the first structure and the second structure from the edge sealing structure.

[0027] In some embodiments, the step of filling the liquid material forming the edge sealing structure into the limiting groove includes:

[0028] Filling the liquid material forming the edge sealing structure into the limiting groove by injection, spot coating, scraping or 3D printing;

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

[0030] In some embodiments, preparing the display substrate includes preparing a backplane;

[0031] Prepare a display screen on one side of the back panel;

[0032] A back film is attached to a side of the back plate facing away from the display screen;

[0033] Applying the liquid material of the edge sealing structure on one side of the to-be-bent portion of the binding portion of the display screen close to the back plate by dripping or injecting;

[0034] Bend the binding portion of the display screen to the back side of the back film away from the back plate and fix it to the back side of the back film;

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

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

[0037] The present invention also provides a method for preparing the above display module, comprising preparing a display substrate and a cover plate respectively, covering the display side of the display substrate with the cover plate to form an intermediate product of the display module, and further comprising preparing 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, arranging a shading plate above the opening of the container, the shading plate covering the opening of the container; a hollow pattern is formed on the shading plate, and the position of the hollow pattern corresponds to the formation position of the edge sealing structure;

[0039] Adding liquid material for forming the edge sealing structure into the container;

[0040] Solidifying the liquid material of the edge sealing structure in the area corresponding to the hollow pattern through the hollow pattern;

[0041] The prepared display module is taken out from the container.

[0042] In some embodiments, adding the liquid material forming the edge sealing structure into the container comprises:

[0043] Adding the liquid material for forming the edge sealing structure into the container N times, each time the liquid material is added, the liquid level of the liquid material in the container rises by 1 / N of the thickness of the edge sealing structure;

[0044] The step of solidifying the liquid material of the edge sealing structure in an area corresponding to the hollow pattern through the hollow pattern includes:

[0045] The area of ​​the liquid material of the edge sealing structure corresponding to the hollow pattern is solidified N times, and each time the liquid material is added, the area of ​​the liquid material of the edge sealing structure corresponding to the hollow pattern is solidified once.

[0046] Beneficial effects of the present invention: The display module provided by the present invention can achieve surface-to-surface direct bonding assembly between the edge sealing structure and the middle frame of the entire machine by making the side surface of the edge sealing structure facing away from the display substrate and the side surface facing away from the edge end face of the display substrate both flat. This not only improves the packaging reliability of the display module, but also reduces the frame of the entire machine using the display module.

[0047] The preparation method of the display module provided by the present invention can, on the one hand, ensure that the surface of the prepared edge sealing structure on the side facing away from the display substrate and the surface on the side facing away from the edge end face of the display substrate are both flat, so that the surface-to-surface direct bonding assembly between the edge sealing structure and the whole machine middle frame can be achieved, which not only improves the packaging reliability of the display module, but also reduces the frame of the whole machine using the display module; on the other hand, the preparation method controls the filling position of the liquid material of the edge sealing structure through the limiting frame, which can relax the accuracy requirement of the setting position of the liquid material of the edge sealing structure, and improve the packaging quality of the edge end face of the display substrate; the preparation method is simple, easy to implement, efficient and convenient.

[0048] The display device provided by the present invention improves the packaging reliability of the display device and reduces the frame of the entire display device by adopting the above-mentioned display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the packaging of the side of the OLED display module in the related art;

[0050] Figure 2 It is a schematic diagram of the assembly of an OLED display module and a middle frame in the related art;

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

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

[0053] Figure 4a A schematic cross-sectional view of a manufacturing method of a display module according to an embodiment of the present invention;

[0054] Figure 4b A schematic top view of a structure of a method for preparing a display module according to an embodiment of the present invention;

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

[0056] Figure 4d A schematic diagram of a process of filling the gap between the bent portion of the binding portion of the display screen and the corresponding side edge end surfaces of the back plate and the back film with an edge sealing structure material in an embodiment of the present invention;

[0057] Figure 5 It is a structural cross-sectional schematic diagram of another method for preparing a display module according to an embodiment of the present invention.

[0058] The accompanying drawings are marked as follows:

[0059] 1. Display substrate; 11. Display screen; 11a. Binding 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. Shading plate; 80. Hollow pattern; 9. Packaging adhesive. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the technical solution of the present invention, a display module and a preparation method thereof and a display device of the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0061] In related technologies, such as Figure 1 As shown, a circle of packaging glue 9 can be dotted on the side of the OLED display module (ie, the edge end face of the display substrate 1 in the display module) to protect the side of the display module.

[0062] Figure 1 The packaging method for the side of the display module shown in the figure can improve the reliability of the display module, but the shape of the packaging glue applied is in the shape of a "hill", and the shape is difficult to control, which is not conducive to assembly with the whole machine. Figure 2 As shown, the display module after glue dispensing is assembled with the middle frame 4 of the whole machine. A large space needs to be reserved in the middle frame 4 to avoid the glue hill. The overall reliability of the display module is low and the frame of the whole machine is large.

[0063] In order to solve the problem that the display module with the above-mentioned side packaging has low reliability and a large frame of the whole device, an embodiment of the present invention provides a display module, such as Figure 3a and Figure 3b As shown, it includes a display substrate 1 and a cover plate 2, the display side and the 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, and also includes an edge sealing structure 3, covering the edge end face of the display substrate 1, and the orthographic projection of the packaging structure 3 on the plane where the cover plate 2 is located overlaps with the orthographic projections of the surrounding edge areas of the cover plate 2 and the surrounding edge areas of the display substrate 1 on the plane where the cover plate 2 is located, and 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 planes.

[0064] In this embodiment, 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 whole machine middle frame 4 can be directly bonded and assembled face to face, 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 a surface of the cover plate 2 close to the display substrate 1 , and the orthographic projection of the edge sealing structure 3 on the plane where the cover plate 2 is located is located within the orthographic projection area of ​​the cover plate 2 on the plane where the cover plate 2 is located.

[0066] The area of ​​the surface of the cover plate 2 close to the display substrate 1 is larger than the area of ​​the surface of the display substrate 1 close to the cover plate 2. After the cover plate 2 and the display substrate 1 are stacked, the peripheral edge area of ​​the cover plate 2 does not overlap with the display substrate 1. The cover plate 2 and the display substrate 1 are bonded by transparent optical adhesive 5. The edge sealing structure 3 is in contact with the peripheral edge area of ​​the surface of the cover plate 2 close to the display substrate 1. The peripheral edge area of ​​the cover plate 2 is the area of ​​the cover plate 2 that 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, the back plate 12 and the back film 13 are sequentially stacked on one side of the cover plate 2. The display screen 11 has a binding portion 11a. The binding portion 11a of the display screen 11 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 edge sealing structure 3 is in contact with the surface of the binding portion 11a of the display screen 11 away from the cover plate 2; at the other side edges of the display substrate 1, the edge sealing structure 3 is in contact with the surface of the back film 13 away from the cover plate 2. In this way, the edge sealing structure 3 can form a good package and protection for the edge end faces of the display substrate 1 around the periphery, preventing the edge end faces of the display substrate 1 from being damaged during mechanical tests 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 binding portion 11 a of the flexible OLED display screen can be bent to the back side of the back film 13 so as to be bound and connected to 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 arranged on the back side of the display screen 11, which will not be described in detail here.

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

[0071] Among them, the bent part of the binding part 11a of the display screen 11 covers the corresponding side edge end faces of the back panel 12 and the back film 13. By filling the material of the edge sealing structure 3 in the gap 11b, the edge end faces of the back panel 12 and the back film 13 covered by the bent part of the binding part 11a of the display screen 11 can be well packaged to prevent the edge end faces of the back panel 12 and the back film 13 from being damaged during mechanical tests and environmental tests.

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

[0073] In some embodiments, the heat curing adhesive material is an epoxy resin material, and the light curing material is an acrylic material or an epoxy resin material.

[0074] The display module provided by the embodiment of the present invention can realize surface-to-surface direct bonding assembly between the edge sealing structure and the middle frame of the entire machine by making the side surface of the edge sealing structure facing away from the display substrate and the side surface facing away from the edge end face of the display substrate both flat. This not only improves the packaging reliability of the display module, but also reduces the frame of the entire machine using the display module.

[0075] Based on the above structure of the display module, an embodiment of the present invention further provides a method for preparing the display module, such as Figure 4a and Figure 4b As shown, it includes step S101: preparing a display substrate 1 and a cover plate 2 respectively, and covering the cover plate 2 on the display side of the display substrate 1, and also includes preparing an edge sealing structure 3, and the preparation of the edge sealing structure 3 includes: step S102: arranging 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 corresponds to the formation position of the edge sealing structure 3;

[0076] Step S103: filling the liquid material for forming the edge sealing structure 3 into the limiting groove 60;

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

[0078] Step S105: removing the limiting frame.

[0079] The liquid material forming the edge sealing structure 3 may be in a relatively thin liquid state or in a relatively viscous liquid state.

[0080] The preparation method of the display module can, on the one hand, ensure that the side surface of the prepared 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 flat, so that the surface-to-surface direct bonding assembly between the edge sealing structure 3 and the whole machine middle frame can be achieved, which not only improves the packaging reliability of the display module, but also reduces the frame of the whole machine using the display module; on the other hand, the preparation method controls the filling position of the liquid material of the edge sealing structure 3 through the limiting frame 6, which can relax the accuracy requirement of the setting position of the liquid material of the edge sealing structure 3, and improve the packaging quality of the edge end face of the display substrate 1; the preparation method is simple, easy to implement, efficient and convenient.

[0081] In some embodiments, Figure 4cAs shown, the limiting groove 60 is a hollow pattern opened in the limiting frame 6, and 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 where the cover plate 2 is located is located in the orthographic projection area of ​​the display substrate 1 on the plane where the cover plate 2 is located, and the distance s between the orthographic projection of the first structure 601 on the plane where the cover plate 2 is located and the edge of the orthographic projection of the display substrate 1 on the plane where the cover plate 2 is located 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 where the cover plate 2 is located surrounds the periphery of the orthographic projection of the cover plate 2 on the plane where the cover plate 2 is located, and the second structure 602 is in contact with the edge end faces of the four sides of the cover plate 2.

[0082] 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 where the cover plate 2 is located and the edge of the orthographic projection of the display substrate 1 on the plane where the cover plate 2 is located is greater than 0, so that the edge sealing structure 3 formed finally 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, so that the edge sealing structure 3 covers the edge end face of the display substrate 1 more firmly and stably, 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 where the cover plate 2 is located and the edge of the orthographic projection of the display substrate 1 on the plane where the cover plate 2 is located can be any one of 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, and 1.1 mm.

[0084] In some embodiments, Figure 4c As shown, the first structure 601 is tightly fitted with the back surface of the back film 13 in the display substrate 1, and the second structure 602 is tightly fitted with the edge end surface of the cover plate 2. The first structure 601, the second structure 602 and the display substrate 1 are arranged to form a U-shaped space, which is the position for filling the liquid material to form the edge sealing structure 3.

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

[0086] In some embodiments, 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 contour shape of the display substrate 1 on the plane where the cover plate 2 is located. That is, the first structure 601 only covers the edges of the area on the back surface of the display substrate 1 other than the area where the edge sealing structure 3 is set.

[0087] In some embodiments, adjacent and opposite surfaces of the first structure 601 and the second structure 602 are coated with a lubricant, and the lubricant 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 edge sealing structure 3 after subsequent curing, so that the limiting frame 6 can be smoothly separated from the edge sealing structure 3, and then the limiting frame 6 can 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, including: filling the liquid material forming the edge sealing structure 3 into the limiting groove 60 by injection, dotting, scraping or 3D printing; step S104: solidifying the liquid material of the edge sealing structure 3, including: solidifying the liquid material of the edge sealing structure 3 by heating or light curing.

[0090] The liquid material of the edge sealing structure 3 can be thermally cured glue, and if the heating temperature is about 60°C, it generally does not cause damage to the circuit structure on the back side of the display substrate 1. The liquid material of the edge sealing structure 3 can also be light-cured glue, such as UV light.

[0091] In some embodiments, Figure 4d As shown, preparing the display substrate 1 includes step S1011: preparing a backplane 12; preparing a display screen 11 on one side of the backplane 12; attaching a back film 13 on the side of the backplane 12 away from the display screen 11;

[0092] Step S1012: applying the liquid material 30 of the edge sealing structure 3 on one side of the to-be-bent portion of the binding portion 11 a of the display screen 11 close to the back plate 12 by dripping or injecting;

[0093] Step S1013: bend the binding portion 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; and cure the liquid material 30 of the edge sealing structure 3 by heating or light curing.

[0094] The above-mentioned process method for preparing the display substrate 1 can form a good package for the edge end faces of the back panel 12 and the back film 13 covered by the bent part of the binding part 11a of the display screen 11, thereby preventing the edge end faces of the back panel 12 and the back film 13 from being damaged during mechanical tests and environmental tests.

[0095] In some embodiments, reference Figure 4a and Figure 4bThe number of the limiting grooves 60 is multiple, and the multiple limiting grooves 60 are arranged in an array. That is, multiple limiting grooves 60 can be designed in the limiting frame 6, and each limiting groove 60 corresponds to encapsulating an edge end face of the display substrate 1, so that the limiting frame 6 is designed with multiple encapsulation stations, which improves the encapsulation efficiency, and the limiting frame 6 can be reused, which is efficient and convenient.

[0096] Based on the display module structure in the above embodiment, the embodiment of the present invention further provides a method for preparing a display module, such as Figure 5 As shown, step S201: comprising preparing a display substrate 1 and a cover plate 2 respectively, and covering the cover plate 2 on the display side of the display substrate 1 to form an intermediate product of a display module;

[0097] The method further includes preparing 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 arranging a light shielding plate 8 above the opening of the container 7, the light shielding plate 8 covering the opening of the container 7; a hollow pattern 80 is formed on the light shielding plate 8, and the position of the hollow pattern 80 corresponds to the formation position of the edge sealing structure 3;

[0098] Step S203: adding liquid material 30 for forming the edge sealing structure 3 into the container 7;

[0099] Step S204: solidifying the area of ​​the liquid material 30 of the edge sealing structure 3 corresponding to the hollow pattern 80 through the hollow pattern 80;

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

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

[0102] In some embodiments, the liquid material 30 of the edge sealing structure 3 is solidified by irradiating UV light into the hollow pattern 80. The liquid material 30 in the area irradiated by the UV light is solidified and formed, and the liquid material 30 in the area not irradiated is still in liquid state. After the curing is completed, the product is taken out to obtain the required packaged display module.

[0103] The preparation method of the display module can, on the one hand, ensure that the side surface of the prepared 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 flat, so that the surface-to-surface direct bonding assembly between the edge sealing structure 3 and the whole machine middle frame can be achieved, which not only improves the packaging reliability of the display module, but also reduces the frame of the whole machine using the display module; on the other hand, the preparation method controls the filling position of the liquid material of the edge sealing structure 3 through the limiting frame 6, which can relax the accuracy requirement of the setting position of the liquid material of the edge sealing structure 3, and improve the packaging quality of the edge end face of the display substrate 1; the preparation method is simple, easy to implement, efficient and convenient.

[0104] In some embodiments, step S203: adding liquid material 30 for forming edge sealing structure 3 into container 7 comprises:

[0105] Adding liquid material 30 for forming the edge sealing structure 3 into the container 7 N times, each time the liquid material 30 is added, the liquid level of the liquid material 30 in the container 7 rises by 1 / N of the thickness of the edge sealing structure 3;

[0106] Step S204: solidifying 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 area of ​​the liquid material 30 of the edge sealing structure 3 corresponding to the hollow pattern 80 is solidified N times. Each time the liquid material 30 is added, the area of ​​the liquid material 30 of the edge sealing structure 3 corresponding to the hollow pattern 80 is solidified once.

[0108] In some embodiments, the liquid material 30 of the edge sealing structure 3 is easily affected by the depth of UV light curing, and the liquid material 30 can be added and cured N times. For example, the curing depth of UV light within 30 to 50 seconds is 0.3 to 0.5 mm. Since the light transmittance of the liquid material 30 is poor, the curing depth of UV light after more than 50 seconds is still 0.3 to 0.5 mm. Generally, the edge sealing structure 3 of a mobile phone display module needs to have a thickness of 1.2 mm. The depth of UV light curing liquid material 30 is 0.3 mm in a single time, so it can be cured in four times. First, add 0.3 mm of liquid material 30 to the container 7 and cure it once; then fill the liquid material 30 to a depth of 0.6 mm and cure it a second time, until the required packaging thickness of the edge sealing structure 3 is reached.

[0109] In some embodiments, the liquid material 30 of the edge sealing structure 3 added to the container 7 can automatically flow into the gap formed between the bent portion of the binding portion of the display screen 11 in the display substrate 1 and the corresponding side edge end faces of the back plate 12 and the back film 13, and there is no need to use the process method of filling the gap with the material of the edge sealing structure 3 in the previous preparation method embodiment to fill the gap. In the preparation method of this embodiment, the material of the edge sealing structure 2 that automatically flows into the gap can also form a good package for the edge end faces of the back plate 12 and the back film 13 covered by the bent portion of the binding portion 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 during mechanical tests and environmental tests.

[0110] The preparation method of the display module provided by the embodiment of the present invention can, on the one hand, ensure that the surface of the prepared edge sealing structure on the side facing away from the display substrate and the surface on the side facing away from the edge end face of the display substrate are both flat, thereby enabling surface-to-surface direct bonding assembly between the edge sealing structure and the middle frame of the entire machine, which not only improves the packaging reliability of the display module, but also reduces the frame of the entire machine using the display module; on the other hand, the preparation method controls the filling position of the liquid material of the edge sealing structure through a limiting frame, which can relax the accuracy requirement of the setting position of the liquid material of the edge sealing structure, and improve the packaging quality of the edge end face of the display substrate; the preparation method is simple, easy to implement, efficient and convenient.

[0111] An embodiment of the present invention further provides a display device, comprising the display module in the above embodiment.

[0112] By adopting the display module in the above embodiment, the packaging reliability of the display device is improved and the frame of the entire display device is reduced.

[0113] The display device can be: an OLED panel, an OLED TV, an electronic paper, a mobile phone, a tablet computer, a laptop computer, a display, a laptop computer, a digital photo frame, a navigator, or any other product or component with a display function.

[0114] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill 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 display module, comprising a display substrate and a cover plate, wherein a display side and a back side of the display substrate are arranged opposite to each other, and the cover plate covers the display side of the display substrate. It is characterized in that It also includes an edge sealing structure, covering the edge end surface of the display substrate, and the orthographic projection of the packaging structure on the plane where the cover plate is located overlaps with the orthographic projections of the peripheral edge area of ​​the cover plate and the peripheral edge area of ​​the display substrate on the plane where the cover plate is located. A surface of the edge sealing structure on one side facing away from the display substrate and a surface of the side facing away from the edge end face of the display substrate are both planes.

2. The display module according to claim 1, characterized in that: The edge sealing structure is in contact with a surface of one side of the cover plate close to the display substrate, and an orthographic projection of the edge sealing structure on the plane where the cover plate is located is located within an orthographic projection area of ​​the cover plate on the plane where the cover plate is located.

3. The display module according to claim 2, characterized in that: The display substrate comprises 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. The display screen has a binding portion, and the binding portion of the display screen 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 is in contact with a surface of a side of the binding portion of the display screen that is away from the cover plate; At other side edges of the display substrate, the edge sealing structure is in contact with a surface of the back film that is away from the cover plate.

4. The display module according to claim 3, characterized in that: A gap is formed between the bent portion of the binding portion of the display screen and the corresponding side edge end surfaces of the back plate and the back film, and the gap is filled with the material of the edge sealing structure.

5. The display module according to any one of claims 1 to 4, characterized in that: The edge sealing structure adopts a heat-curing adhesive material or a light-curing adhesive material.

6. A display device, characterized in that: A display module comprising any one of claims 1-5.

7. A method for preparing a display module according to any one of claims 1 to 5, comprising preparing a display substrate and a cover plate respectively, and covering the cover plate on the display side of the display substrate, wherein: It also includes preparing an edge-sealing structure, Preparing the edge sealing structure includes: arranging 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 corresponds to the formation position of the edge sealing structure; Filling the liquid material forming the edge sealing structure into the limiting groove; Solidifying the liquid material of the edge sealing structure; The limiting frame is removed.

8. The method for preparing a display module according to claim 7, characterized in that: The limiting groove is a hollow pattern opened in the limiting frame, and the limiting groove is formed by the first structure and the second structure; The first structure is located at 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, and 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 the plane where the cover plate is located, and the second structure contacts the peripheral edge end surfaces of the cover plate.

9. The method for preparing a display module according to claim 8, characterized in that: The first structure is plate-shaped, and the orthographic projection shapes of the first structure and the display substrate on the plane where the cover plate is located are the same; Alternatively, the first structure is in a closed ring shape, and the orthographic projection shape of the first structure on the plane where the cover plate is located is the same as the shape of the orthographic projection contour of the display substrate on the plane where the cover plate is located.

10. The method for preparing a display module according to claim 9, characterized in that: A lubricant is coated on adjacent and opposite surfaces of the first structure and the second structure, and the lubricant can assist in separating the first structure and the second structure from the edge sealing structure.

11. The method for preparing a display module according to claim 7, characterized in that: The step of filling the liquid material forming the edge sealing structure into the limiting groove comprises: Filling the liquid material forming the edge sealing structure into the limiting groove by injection, spot coating, scraping or 3D printing; The solidifying the liquid material of the edge sealing structure includes: solidifying the liquid material of the edge sealing structure by heating or light curing.

12. The method for preparing a display module according to claim 7, characterized in that: Preparing the display substrate includes preparing a backplane; Prepare a display screen on one side of the back panel; A back film is attached to a side of the back plate facing away from the display screen; Applying the liquid material of the edge sealing structure on one side of the to-be-bent portion of the binding portion of the display screen close to the back plate by dripping or injecting; Bend the binding portion of the display screen to the back side of the back film away from the back plate and fix it to the back side of the back film; The liquid material of the edge sealing structure is cured by heating or light curing.

13. The method for preparing a display module according to claim 7, characterized in that: There are multiple limiting grooves, and the multiple limiting grooves are arranged in an array.

14. A method for preparing a display module according to any one of claims 1 to 5, comprising preparing a display substrate and a cover plate respectively, and covering the display side of the display substrate with the cover plate to form an intermediate product of the display module, wherein: It also includes preparing 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, arranging a shading plate above the opening of the container, the shading plate covering the opening of the container; a hollow pattern is formed on the shading plate, and the position of the hollow pattern corresponds to the formation position of the edge sealing structure; Adding liquid material for forming the edge sealing structure into the container; Solidifying the liquid material of the edge sealing structure in the area corresponding to the hollow pattern through the hollow pattern; The prepared display module is taken out from the container.

15. The method for preparing a display module according to claim 14, characterized in that: The step of adding the liquid material to form the edge sealing structure into the container comprises: Adding the liquid material for forming the edge sealing structure into the container N times, each time the liquid material is added, the liquid level of the liquid material in the container rises by 1 / N of the thickness of the edge sealing structure; The step of solidifying the liquid material of the edge sealing structure in an area corresponding to the hollow pattern through the hollow pattern includes: The area of ​​the liquid material of the edge sealing structure corresponding to the hollow pattern is solidified N times, and each time the liquid material is added, the area of ​​the liquid material of the edge sealing structure corresponding to the hollow pattern is solidified once.

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