A display module, manufacturing method, and display device

Abstract

The present application relates to the field of display technologies, and specifically relates to a display module, a manufacturing method, and a display device. The display module includes a display screen, an auxiliary function layer, an external circuit component, and a sealant. A first bonding area is provided on the side where the light-emitting surface of the display screen is located, and the first bonding area is adjacent to the first end of the display screen; the auxiliary function layer is disposed on the back side of the display screen, and an extended bonding surface is formed on the side of the auxiliary function layer facing away from the display screen; or the part of the back side of the display screen not covered by the auxiliary function layer forms an extended bonding surface; the external circuit component is provided with a second bonding area, and the external circuit component is bonded and connected to the first bonding area of the display screen through the second bonding area, and the part of the external circuit component extending beyond the first end of the display screen forms a first step surface; the sealant covers at least a part of the first step surface and integrally covers and bonds at least a part of the first end, and the sealant extends and covers and bonds the extended bonding surface. The present application can improve the stability and reliability of the display module.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display module, a manufacturing method, and a display device. Background Art

[0002] With the rapid development of display technologies, flexible display technologies have attracted great attention. Flexible display products can form full-screen displays and have bendable and foldable properties. At the same time, the requirements for the reliability of flexible products are getting higher and higher. In an acidic or alkaline environment, acidic or alkaline high-humidity gases or liquids are likely to invade the display panel and corrode the circuits in the display panel, affecting the reliability and stability of the display module. Summary of the Invention

[0003] In view of this, the main technical problem to be solved by this application is that the display panel is easily corroded in an acidic or alkaline environment, corroding the circuits in the display panel. This application provides a manufacturing method for a display module and a display device, which can improve the reliability and stability of the display module.

[0004] To solve the above technical problem, a technical solution adopted by this application is: providing a display module, including a display screen, an auxiliary function layer, an external circuit component, and a sealant. A first bonding area is provided on the side where the light-emitting surface of the display screen is located, and the first bonding area is adjacent to the first end of the display screen; the auxiliary function layer is disposed on the back side of the display screen, and an extended bonding surface is formed on the side of the auxiliary function layer facing away from the display screen; or an extended bonding surface is formed on the part of the back of the display screen not covered by the auxiliary function layer; the external circuit component is provided with a second bonding area, and the external circuit component is bonded and connected to the first bonding area of the display screen through the second bonding area. The part of the external circuit component extending beyond the first end of the display screen forms a first step surface; the sealant covers at least a part of the first step surface, integrally covers and bonds at least a part of the first end, and the sealant extends and covers and bonds the extended bonding surface.

[0005] Wherein, an extended bonding surface is formed on the part of the back of the display screen not covered by the auxiliary function layer. In the direction of the first step surface pointing to the second bonding area, the size of the extended bonding surface is greater than the manufacturing precision of the sealant, and the sealant covers and bonds the extended bonding surface without covering the side of the auxiliary function layer facing away from the display screen.

[0006] Wherein, the end of the auxiliary function layer is flush with the first end of the display screen, an extended bonding surface is formed on the side of the auxiliary function layer facing away from the display screen. In the direction of the first step surface pointing to the second bonding area, the size of the extended bonding surface is greater than the manufacturing precision of the sealant, and the sealant covers and bonds the extended bonding surface.

[0007] Among them, the auxiliary function layer includes a support film. A first extended bonding surface is formed on the side of the support film facing away from the display screen, and a second extended bonding surface is formed on the part of the back surface of the display screen not covered by the support film; the sealant covers at least a part of the first step surface and integrally covers at least a part of the bonded first end; and the sealant extends and covers the bonded first extended bonding surface and the second extended bonding surface.

[0008] Among them, in the direction from the first step surface to the second bonding area, the sum of the sizes of the first extended bonding surface and the second extended bonding surface is greater than the manufacturing precision of the sealant.

[0009] Among them, the auxiliary function layer includes a support film. The support film is located on the back surface of the display screen. The support film includes a first support portion and a second support portion. The first support portion is adjacent to the first end; there is a gap between the second support portion and the first support portion, and the second support portion is located on the side of the first support portion away from the first end; the extended bonding surface includes at least a partial area of the surface of the first support portion facing away from the display screen and at least a partial area of the back surface of the display screen at the gap position; the sealant covers at least a part of the first step surface and integrally covers at least a part of the first end of the bonded display screen, at least a part of the two end faces of the first support portion, at least a part of the back surface of the first support portion, and at least a part of the back surface of the display screen at the gap position, where the two end faces of the first support portion are adjacent to the back surface of the first support portion respectively.

[0010] Among them, the display module further includes a conductive adhesive, and the conductive adhesive is located between the first bonding area and the second bonding area.

[0011] Among them, the display module further includes a conductive adhesive. A part of the conductive adhesive is located between the first bonding area and the second bonding area, and another part is exposed at the first end, and the sealant covers the other part of the conductive adhesive.

[0012] Among them, the display module further includes a protective film, and the protective film is located on the side of the auxiliary function layer facing away from the display screen.

[0013] Among them, when an extended bonding surface is formed on the side of the auxiliary function layer facing away from the display screen, the projection of the protective film on the auxiliary function layer does not overlap with the extended bonding surface.

[0014] Among them, the external circuit component includes a flexible printed circuit board. The first bonding area of the display screen has a first pin, and the second bonding area of the flexible printed circuit board has a second pin; the first pin is electrically connected to the second pin.

[0015] Wherein, the display module further includes a cover plate, a protective layer, and a reinforcing adhesive. The cover plate is disposed on the light-emitting surface of the display screen. The side of the cover plate that is not covered by the display screen and faces the display screen forms a second stepped surface, and the second stepped surface is adjacent to the side where the first bonding area is located. The protective layer is disposed on the side of the auxiliary function layer facing away from the display screen. The side of the auxiliary function layer that is not covered by the protective layer and faces the protective layer forms a third stepped surface, and the third stepped surface and the second stepped surface are on the same side of the first bonding area. The reinforcing adhesive integrally covers at least a part of the second stepped surface, at least a part of the side surfaces of the display screen and the auxiliary function layer, and at least a part of the third stepped surface.

[0016] This application further includes a second technical solution, a method for manufacturing a display module, including:

[0017] Providing a display screen, the display screen including a test area and a non-test area, wherein the non-test area is close to the end where the first bonding area of the display screen is located;

[0018] Providing an auxiliary function layer on the back surface of the display screen. Wherein, an extended bonding surface is formed on the side of the auxiliary function layer facing away from the display screen, or a part of the back surface of the display screen that is not covered by the auxiliary function layer forms an extended bonding surface. The extended bonding surface is at least partially located in the non-test area and is close to the end where the first bonding area is located;

[0019] Removing the display screen in the test area, or removing the display screen and the auxiliary function layer in the test area. The first bonding area and the extended bonding surface are adjacent to the first end of the display screen in the non-test area;

[0020] Bonding the first bonding area of the display screen in the non-test area to the second bonding area of the external circuit component. The part of the external circuit component that extends beyond the first end of the display screen forms a first stepped surface;

[0021] Manufacturing a sealing adhesive such that the sealing adhesive integrally covers at least a part of the first stepped surface, and integrally covers at least a part of the bonded first end and the extended bonding surface.

[0022] Wherein, the auxiliary function layer includes a first auxiliary part and a second auxiliary part. Providing the auxiliary function layer on the back surface of the display screen includes: respectively manufacturing the first auxiliary part and the second auxiliary part on the back surface of the display screen. The first auxiliary part at least covers the display screen in the test area, and the second auxiliary part is stacked on the display screen in the non-test area. There is a gap between the first auxiliary part and the second auxiliary part, and the back surface of the display screen at the gap position forms an extended bonding surface. Removing the display screen and the auxiliary function layer in the test area includes: removing the display screen in the test area and at least a part of the first auxiliary part in the test area.

[0023] Wherein, manufacturing the sealing adhesive includes placing a nozzle above the display module and making the orthographic projection of the nozzle on the display module located on the first stepped surface, and spraying the sealing adhesive such that the sealing adhesive flows from the first stepped surface to the first end and the extended bonding surface.

[0024] The present application further includes a third technical solution. A display device includes a driving circuit and the above-mentioned display module, and the driving circuit is used to drive the display module.

[0025] The beneficial effects of the present application are as follows: Different from the related art, in the display module of the present application, an extended bonding surface is formed on the side of the auxiliary function layer facing away from the display screen, or an extended bonding surface is formed on the back of the display screen not covered by the auxiliary function layer, and the sealant covers at least part of the first step surface. The sealant further extends to cover at least part of the first end and at least part of the extended bonding surface, so that the sealant in the display module of the embodiment of the present application can effectively seal the end face of the first end of the display screen. And integrally seal the gap between the external circuit component and the display screen at the end. It can prevent acidic or alkaline high-humidity gases or liquids from entering the inside of the display screen from the first end of the display screen, causing corrosion and affecting the display of the display screen. It can also improve or prevent acidic or alkaline high-humidity gases or liquids from entering the gap between the external circuit component and the display screen, and avoid the connection lines between the external circuit component and the display screen from being corroded by acidic or alkaline high-humidity gases or liquids. In the embodiment of the present application, by forming an extended bonding surface and a first step surface in the area adjacent to the first end of the display screen, a stepped structure is formed in the area adjacent to the first end of the display module, and the connection between the sealant and the stepped structure is firm; the sealant in the embodiment of the present application can be directly adhered to the extended bonding surface, and can also prevent the sealant from being driven by the protective film when the protective film is torn off later. The sealant is tightly adhered to the extended bonding surface and the first end of the display screen, which can prevent acidic or alkaline high-humidity gases or liquids from invading the inside of the display screen and the area between the display screen and the external circuit from the first end and the surrounding area, improve the stability and reliability of the display module, and extend the service life of the display module. Description of the Drawings

[0026] Figure 1a is a partial cross-sectional structural schematic diagram of an embodiment of a display module in the related art;

[0027] Figure 1b is Figure 1a a partial cross-sectional structural schematic diagram of an embodiment of the display module with the protective film not removed in

[0028] Figure 1c is Figure 1b a partial cross-sectional view of an embodiment of the display module in

[0029] Figure 2a is a partial cross-sectional structural schematic diagram of the first embodiment of the display module of the present application;

[0030] Figure 2b is a partial cross-sectional structural schematic diagram of the second embodiment of the display module of the present application;

[0031] Figure 3 It is a schematic diagram of a partial cross-sectional structure of the third embodiment of the display module of the present application;

[0032] Figure 4a It is a schematic diagram of a partial cross-sectional structure of the fourth embodiment of the display module of the present application;

[0033] Figure 4b It is a schematic diagram of a partial cross-sectional structure of the fifth embodiment of the display module of the present application;

[0034] Figure 5 It is a schematic diagram of a partial cross-sectional structure of the sixth embodiment of the display module of the present application;

[0035] Figure 6a It is a schematic diagram of a partial cross-sectional structure of the seventh embodiment of the display module of the present application;

[0036] Figure 6b It is a schematic diagram of a partial cross-sectional structure of the eighth embodiment of the display module of the present application;

[0037] Figure 7 It is a schematic diagram of a partial cross-sectional structure of the ninth embodiment of the display module of the present application;

[0038] Figure 8a It is a schematic diagram of a partial cross-sectional structure of the tenth embodiment of the display module of the present application;

[0039] Figure 8b It is a schematic diagram of a partial cross-sectional structure of the eleventh embodiment of the display module of the present application;

[0040] Figure 9 It is a schematic diagram of a partial cross-sectional structure of the twelfth embodiment of the display module of the present application;

[0041] Figure 10 It is a schematic diagram of a partial cross-sectional structure of the thirteenth embodiment of the display module of the present application;

[0042] Figure 11 It is a schematic diagram of the cross-sectional structure of the fourteenth embodiment of the display module of the present application;

[0043] Figure 12 It is a schematic diagram of the planar structure of the display module of the present application;

[0044] Figure 13a It is a schematic diagram of a partial cross-sectional structure of the first embodiment of the display module of Comparative Sample 1;

[0045] Figure 13b is Figure 13a a partial cross-sectional view of the first embodiment of the display module;

[0046] Figure 14 It is a schematic diagram of the cross-sectional structure of the first embodiment of the display module of the present application;

[0047] Figure 15 Schematic plan view of an embodiment of the display module of the present application;

[0048] Figure 16 Flow chart of an embodiment of the manufacturing method of the display module of the present application;

[0049] Figure 17 Flow chart of another embodiment of the manufacturing method of the display module of the present application;

[0050] Figure 18a Partial cross-sectional structure diagram of the first embodiment of the display module of the present application having a test area;

[0051] Figure 18b Is Figure 18a Partial cross-sectional structure diagram of the test area removed;

[0052] Figure 19a Partial cross-sectional structure diagram of the second embodiment of the display module of the present application having a test area;

[0053] Figure 19b Is Figure 19a Partial cross-sectional structure diagram of the test area removed;

[0054] Figure 20a Partial cross-sectional structure diagram of the third embodiment of the display module of the present application having a test area;

[0055] Figure 20b Is Figure 20a Partial cross-sectional structure diagram of the test area removed;

[0056] Figure 21a Partial cross-sectional structure diagram of the fourth embodiment of the display module of the present application having a test area;

[0057] Figure 21b Is Figure 21a Partial cross-sectional structure diagram of the test area removed;

[0058] Figure 22a Partial cross-sectional structure diagram of the fifth embodiment of the display module of the present application having a test area;

[0059] Figure 22b Is Figure 22a Partial cross-sectional structure diagram of the test area removed;

[0060] Figure 23a Partial cross-sectional structure diagram of the sixth embodiment of the display module of the present application having a test area;

[0061] Figure 23b Is Figure 23aSchematic diagram of the local cross-sectional structure of the cut test area. Detailed implementation manners

[0062] Currently, as Figure 1a shown, there are circuit traces on the array substrate (not shown in the figure) of the display screen 10. Before subsequent assembly of the display screen 10, it is necessary to first test the display screen 10 to detect whether the circuits in the display screen 10 are abnormal and avoid wasting processes in the subsequent steps. Before the test, a support film 201 is attached to the back of the flexible display screen as an auxiliary functional layer 21, and a protective film 22 is attached to the side of the support film 201 facing away from the display screen to support and protect the flexible display screen. After the test, the display screen 10 in the test area and the corresponding support film 201 and protective film 22 are cut off to form the display screen 10 after the test is completed, as well as the support film 201 and protective film 22 on the back of the display screen 10.

[0063] The display screen 10 has a bonding area, and the display screen 10 is bonded to the flexible circuit board 41. To prevent acidic or alkaline high-humidity gases or liquids from entering the display screen 10 and corroding the circuits in the display screen 10 in the subsequent steps, a sealant 50 is sprayed at the end of the display screen 10 at the bonding position of the display screen 10 and the flexible circuit board 41. Affected by the spraying process, the sealant 50 seals the end of the display screen 10 and overlaps on the back of the protective film 22.

[0064] After the bonding of the display screen 10 and the flexible circuit board 41 is completed, processes such as making a touch circuit, a polarizer, and a cover plate can be performed on the light-emitting surface of the display screen 10. The protective film 22 is removed to form a schematic diagram of the structure of the display module 100’ as Figure 1a shown. One end of a part of the sealant 50 on the protective film 22 is attached to the back of the support film 201, and there is a gap between the protective film 22 and the back of the support film 201. Or a part of the sealant 50 on the protective film 22 is integrally attached to the back of the support film 201, but the protective film 22 does not closely contact the support film 201. Then the flexible circuit board 41 is bent to the back of the display screen 10. Among them, in order to achieve narrow-screen display of the display panel, the flexible display screen can also be bent so that the flexible circuit board 41 is located on the back of the display screen 10. After the display module is manufactured or during the later use of the display module, in a display module in a specific environment of acidic or alkaline high-humidity gases or liquids, as Figure 1c shown, there is acidic or alkaline crystallization 101 between the display screen 10 and the flexible circuit board 41, and the acidic or alkaline crystallization is likely to cause corrosion of the display screen 10 and the flexible circuit board 41; there is still a situation where the circuit traces in the display screen 10 are corroded.

[0065] After research, the applicant found that when the protective film 22 is torn off, it is easy to drive the sealant 50, so that at least partial gaps are generated between the sealant 50 and the end of the display screen 10. Or, after the protective film 22 is torn off, there are no gaps between the sealant 50 and the end of the display screen 10, but during the later use of the display module, gaps are likely to further appear between the sealant 50 and the end of the display screen 10.

[0066] To solve the above technical problems, as Figure 2a shown, an embodiment of the present application provides a display module 100, including a display screen 10, an auxiliary function layer 21, an external circuit component 40, and a sealant 50. A first bonding area 11 is provided on the side where the light-emitting surface of the display screen 10 is located, and the first bonding area 11 is adjacent to the first end 12 of the display screen 10; the auxiliary function layer 21 is disposed on the back side of the display screen 10, and the part of the back of the display screen 10 not covered by the auxiliary function layer 21 forms an extended bonding surface 31-1; the external circuit component 40 is provided with a second bonding area 41, and the external circuit component 40 is bonded and connected to the first bonding area 11 of the display screen 10 by using the second bonding area 41. The part of the external circuit component 40 that extends beyond the first end 12 of the display screen 10 forms a first step surface 42; the sealant 50 covers at least a part of the first step surface 42, integrally covers and bonds at least a part of the first end 12, and the sealant 50 extends and covers and bonds the extended bonding surface 31-1. In the embodiment of the present application, the extended bonding surface 31-1 is formed by the part of the back of the display screen 10 not covered by the auxiliary function layer 21 and covered by the sealant 50. In another embodiment, as shown in FIG. 2, it may also be that the part of the surface of the auxiliary function layer 21 facing away from the display screen 10 and covered by the sealant 50 forms an extended bonding surface 31-2, that is to say, the extended bonding surface may be naturally formed due to the coverage of the sealant 50.

[0067] As Figure 2a and Figure 2bAs shown, in the embodiment of the present application, by forming an extended bonding surface 31-2 on the side of the auxiliary function layer 21 facing away from the display screen 10 or forming an extended bonding surface 31-2 on the back surface of the display screen 10 not covered by the auxiliary function layer 21, and making the sealant 50 cover at least a partial area of the first step surface 42, the sealant 50 further extends to cover at least a partial area of the first end portion 12 and the extended bonding surface 31-1 or 31-2, so that the sealant 50 of the display module 100 in the embodiment of the present application can effectively seal the end surface of the first end portion 12 of the display screen 10. And integrally seal the gap between the external circuit component 40 and the display screen 10 at the end portion. It is possible to prevent acidic or alkaline high-humidity gases or liquids from entering the inside of the display screen 10 from the first end portion 12 of the display screen 10, corroding the circuit inside the display screen 10, and affecting the display of the display screen 10. It is also possible to improve or prevent acidic or alkaline high-humidity gases or liquids from entering between the first bonding area 11 and the second bonding area 41, that is, improve or prevent acidic or alkaline high-humidity gases or liquids from entering the gap between the external circuit component 40 and the display screen 10, and avoid acidic or alkaline high-humidity gases or liquids from corroding the connection lines between the external circuit component 40 and the display screen 10. In the embodiment of the present application, by forming the extended bonding surface 31-1 or 31-2 and the first step surface 42 in the area adjacent to the first end portion 12 of the display screen 10, a stepped structure (not marked in the figure) is formed in the area adjacent to the first end portion 12 of the display module 100, and the connection between the sealant 50 and the stepped structure is more firm; the sealant 50 in the embodiment of the present application can be directly adhered to the extended bonding surface 31-1 or 31-2, and can also prevent the protective film 22 from driving the sealant 50 when the protective film 22 is torn off later (see Figure 1b ). When the protective film 22 is torn off, the sealant 50 is tightly adhered to the extended bonding surface 31-1 or 31-2 and the first end portion 12 of the display screen 10, which can prevent acidic or alkaline high-humidity gases or liquids from invading the inside of the display screen 10 and the gap between the display screen 10 and the external circuit from the first end portion 12 and the surrounding area, improve the stability and reliability of the display module 100, and extend the service life of the display module 100.

[0068] In the embodiment of the present application, the extended bonding surface 31-1 and the extended bonding surface 31-2 are used to distinguish the stepped surfaces with different structures in different embodiments. In the embodiment of the present application, the extended bonding surface 31-1 or 31-2 is the surface for bonding the sealant 50; specifically, before the sealant 50 is made, the extended bonding surface 31-1 or 31-2 is an exposed surface, which is convenient for the sealant 50 to be directly adhered to the extended bonding surface 31-1 or 31-2 during production. The area of the part of the back surface of the display screen 10 not covered by the auxiliary function layer 21 is greater than or equal to the area of the extended bonding surface 31-1, as Figure 2a shown, the area of the part of the back surface of the display screen 10 not covered by the auxiliary function layer 21 is greater than the area of the extended bonding surface 31-1. As Figure 3As shown, the area of the portion of the back surface of the display screen 10 not covered by the auxiliary function layer 21 is equal to the area of the extended bonding surface 31-1.

[0069] In the embodiment of the present application, the auxiliary function layer 21 includes a support film 201 for supporting the display screen 10. In another embodiment, the auxiliary function layer 21 may further include a first adhesive layer (not shown in the figure), and the first adhesive layer is used to bond the support film 201 and the display screen 10. In other embodiments, the auxiliary function layer 21 may further include other layer structures. For example, it may further include a stretching layer (not labeled in the figure), and the stretching layer is used to improve the bending condition of the display module 100. The embodiment of the present application does not limit the specific structure and function of the auxiliary function layer 21.

[0070] In the embodiment of the present application, the display module 100 further includes a covering layer 70, and the covering layer 70 is disposed on the surface of the external circuit component 40 for protecting the external circuit component 40. Specifically, in the embodiment of the present application, the covering layer 70 is disposed on the side of the external circuit component 40 facing the auxiliary function layer 21. In the embodiment of the present application, the covering layer 70 does not completely cover one end of the external circuit component 40 adjacent to the first end portion 12, so that the first step surface 42 is exposed to the covering layer 70. In the embodiment of the present application, the sealing adhesive 50 integrally covers and bonds a part of the covering layer 70, the first step surface 42, the first end portion 12, and the extended bonding surface 31-1 or 31-2. In other embodiments, the sealing adhesive 50 may also not cover and bond the covering layer 70. The sealing adhesive 50 integrally covers and bonds the first step surface 42, the first end portion 12, and the extended bonding surface 31-1 or 31-2. Or the sealing adhesive 50 integrally covers and bonds a part of the first step surface 42, a part of the first end portion 12, and the extended bonding surface 31-1 or 31-2.

[0071] In the embodiment of the present application, the display screen 10 includes an array substrate, a light-emitting device disposed on the array substrate, and a packaging layer covering the light-emitting device. The array substrate includes a flexible substrate and a pixel circuit array; the light-emitting device includes an anode layer, an organic light-emitting layer, a cathode layer, etc.; the packaging layer includes an inorganic thin-film packaging layer and an organic thin-film packaging layer stacked. In the present application, the specific structure and materials of the light-emitting display layer are not limited and can be set according to the display mode of the display module 100. In the embodiment of the present application, the display screen 10 is divided into a display area and a non-display area, and the first bonding area 11 is located on the array substrate in the non-display area.

[0072] In the embodiment of the present application, the portion of the back surface of the display screen 10 not covered by the auxiliary function layer 21 forms an extended bonding surface 31-1, and the distance h1 from the extended bonding surface 31-1 to the light-emitting surface of the display screen 10 is less than or equal to the maximum distance h2 from the side of the auxiliary function layer 21 facing away from the display screen 10 to the light-emitting surface of the display screen 10.

[0073] In the embodiment of the present application, the sealant 50 is a waterproof and oxygen-barrier adhesive, which can prevent water vapor and oxygen to avoid the intrusion of acidic or alkaline gases or liquids and other water-containing substances and external oxygen into the display screen 10 and the gap between the display screen 10 and the external circuit component 40. The sealant 50 in the embodiment of the present application is an ultraviolet curable adhesive (UV adhesive). In other embodiments, the sealant 50 can also be a Tuffy adhesive or a silicone adhesive, etc.

[0074] In the embodiment of the present application, as Figure 3 and Figure 4a shown, the display module 100 further includes an anisotropic conductive film 60, and the anisotropic conductive film 60 is located between the first bonding area 11 and the second bonding area 41. In the embodiment of the present application, the anisotropic conductive film 60 is disposed between the first bonding area 11 and the second bonding area 41, which can assist the electrical connection between the display screen 10 and the external circuit component 40. In the embodiment of the present application, the anisotropic conductive film 60 is an anisotropic conductive film (ACF), and the anisotropic conductive film 60 located between the first bonding area 11 and the second bonding area 41 can form a layer of anisotropic conductive film layer. In the embodiment of the present application, through process control, the anisotropic conductive film is exactly located between the first bonding area 11 and the second bonding area 41. And the anisotropic conductive film 60 does not have waterproof and oxygen-barrier properties. When the sealant 50 covers the first step surface 42 and integrally covers and bonds the first end portion 12 and the extended bonding surface 31-1 or 31-2, it also covers and bonds the end surface of one end of the anisotropic conductive film layer, which can avoid the intrusion of acidic or alkaline high-humidity gases or liquids along the anisotropic conductive film layer and the first end portion 12 into the display screen 10 and the external circuit, and improve or avoid the corrosion of the connection line between the display screen 10 and the external circuit component 40 by acidic or alkaline high-humidity gases or liquids.

[0075] However, as Figure 5 and Figure 6a shown, when the display screen 10 is connected to the external circuit component 40, the anisotropic conductive film 60 located between the first bonding area 11 and the second bonding area 41 is likely to overflow, so that a part of the anisotropic conductive film 60 is located between the first bonding area 11 and the second bonding area 41, and the other part is exposed to the first end portion 12. For the convenience of description, a part of the anisotropic conductive film 60 located between the first bonding area 11 and the second bonding area 41 is the first sub-anisotropic conductive film 61; the other part of the anisotropic conductive film 60 exposed to the first end portion 12 is the second sub-anisotropic conductive film 62.

[0076] In the embodiment of the present application, the second sub-anisotropic conductive film 62 is in close contact with the first end portion 12, or there may be a gap between the second sub-anisotropic conductive film 62 and the first end portion 12. In the related solution, during the manufacturing process of the sealant 50, the display module 100 does not have the extended bonding surface 31-1 or 31-2. When manufacturing the anisotropic conductive film 60, in order to avoid the separation of the sealant 50 from the first end portion 12 caused by tearing off the protective film 22, through process control, the sealant 50 is prevented from adhering to the protective film 22 (seeFigure 1b ) However, due to the polarity difference between the sealant 50 and the conductive adhesive 60, the sealant 50 contacts the first stepped surface 42, but the sealant 50 does not contact the end surface of the first end portion 12. Thus, it is easy to cause the sealant 50 to be unable to effectively seal the first end portion 12 of the display screen 10, and acidic or alkaline high-humidity gas or liquid may invade between the display screen 10 and between the display screen 10 and the external circuit component 40 along the gap between the sealant 50 and the first end portion 12, corroding the circuit in the display screen 10 and the connection line between the display screen 10 and the external circuit component 40, and reducing the reliability of the display module 100. In the embodiment of the present application, by providing the extended bonding surface 31-1 or 31-2, and making the sealant 50 cover at least a part of the first stepped surface 42, and integrally cover another part of the bonded conductive adhesive 60, at least a part of the first end portion 12, and the extended bonding surface 31-1 or 31-2, so that the sealant 50 can effectively seal the first end portion 12 of the display screen 10, and cover the second sub-conductive adhesive 62, avoiding acidic or alkaline high-humidity gas or liquid from invading the display screen 10 along the first end portion 12, and avoiding acidic or alkaline high-humidity gas or liquid from invading the connection line between the external circuit component 40 and the display screen 10 along the conductive adhesive 60, improving the stability and reliability of the display module 100.

[0077] In the embodiment of the present application, a portion of the back surface of the display screen 10 not covered by the auxiliary function layer 21 forms an extended bonding surface 31-1. In the direction D1 from the first stepped surface 42 towards the second bonding area 41, the dimension h3 of the extended bonding surface 31-1 is greater than the manufacturing precision of the sealant 50. The sealant 50 covers and bonds at least a portion of the extended bonding surface 31-1 without covering the side of the auxiliary function layer 21 facing away from the display screen 10. In the embodiment of the present application, the manufacturing of the sealant 50 refers to covering the sealant 50 on at least a portion of the first stepped surface 42 and integrally covering and bonding at least a portion of the first end 12 and the extended bonding surface 31-1. The manufacturing precision of the sealant 50 is affected by the instrument for manufacturing the sealant 50, that is, affected by the precision of the instrument for manufacturing the sealant 50. In the embodiment of the present application, the manufacturing precision of the sealant 50 is affected by the glue valve, and the manufacturing precision of the sealant 50 is the precision of the glue valve. When other equipment is used to manufacture the sealant 50, it can also be the precision of other equipment. In the embodiment of the present application, the precision of the glue valve is less than or equal to 0.1 mm. In the direction D1 from the first stepped surface 42 towards the second bonding area 41, the dimension of the extended bonding surface 31-1 is greater than 0.1 mm. Specifically, in the embodiment of the present application, the dimension of the extended bonding surface 31-1 is 0.2 - 0.3 mm. In the embodiment of the present application, the direction from the first stepped surface 42 towards the second bonding area 41 is also the direction perpendicular to the end face of the first end 12. In the embodiment of the present application, by setting the dimension h3 of the extended bonding surface 31-1 to be greater than the manufacturing precision of the sealant 50, it is ensured that the sealant 50 will not overflow from the extended bonding surface 31-1 to the back surface of the auxiliary function layer 21 during the manufacturing process, that is, the sealant 50 does not cover the side of the auxiliary function layer 21 facing away from the display screen 10. Among them, the side of the auxiliary function layer 21 facing away from the display screen 10 is the overall surface of the auxiliary function layer 21 that is farthest from the light-emitting surface of the display screen 10.

[0078] Such as Figure 6a And Figure 6bAs shown, in another embodiment, the end of the auxiliary function layer 21 is flush with the first end 12 of the display screen 10. An extended bonding surface 31-2 is formed on the side of the auxiliary function layer 21 facing away from the display screen 10. In the direction from the first step surface 42 to the second bonding area 41, the size of the extended bonding surface 31-2 is larger than the manufacturing precision of the sealant. The sealant 50 covers and bonds to the extended bonding surface 31-2. In the embodiment of the present application, the extended bonding surface 31-2 is formed on the side of the auxiliary function layer 21 facing away from the display screen 10. When the sealant 50 is manufactured, the extended bonding surface 31-2 is exposed, so that the sealant 50 can directly cover and bond to the extended bonding surface 31-2. In the embodiment of the present application, by setting the size h3 of the extended bonding surface 31-1 to be larger than the manufacturing precision of the sealant 50, it is ensured that the sealant 50 will not overflow from the extended bonding surface 31-2 to other areas of the auxiliary function layer 21 during the manufacturing process. This can avoid the situation where the sealant 50 is separated from the first end 12 caused by tearing off the protective film 22 in the related art, so that the sealant 50 can integrally cover and bond to the extended bonding surface 31-2, the first end 12, and the first step surface 42. This can prevent acidic or alkaline high-humidity gases or liquids from invading between the display screen 10 and the external circuit along the conductive adhesive film layer and the first end 12, and improve or avoid the corrosion of the connection lines between the display screen 10 and the external circuit components 40 by acidic or alkaline high-humidity gases or liquids.

[0079] In an embodiment of the present application, as Figure 3 and Figure 5 shown, the auxiliary function layer 21 includes a support film 201, and the support film 201 is located on the back side of the display screen 10. The display module 100 further includes a protective film 22, and the protective film 22 is located on the side of the auxiliary function layer 21 facing away from the display screen 10. An extended bonding surface 31-1 is formed in a partial area of the back side of the display screen 10 that is not covered by the support film 201, and the extended bonding surface 31-1 is adjacent to the first end 12. The protective film 22 is located on the side of the support film 201 facing away from the display screen 10, and the projection of the protective film 22 on the support film 201 covers the support film 201.

[0080] In the embodiment of the present application, the display screen 10 is a flexible display screen. The support film 201 is used to support the display screen 10, and the protective film 22 is used to protect the display module 100 to prevent damage to the support film 201. Specifically, in the embodiment of the present application, the protective film 22 is used to prevent damage to the support film 201 caused by scratching or collision during transportation; and to prevent foreign objects from adhering to the support film 201. In the embodiment of the present application, one end of the protective film 22 is flush with the support film 201 near the first end portion 12. In the embodiment of the present application, an extended bonding surface 31-1 is formed on the back surface of the display screen 10 not covered by the support film 201, so that the sealant 50 covers the first step surface 42 during the manufacturing process and integrally covers and bonds the first end portion 12 and the extended bonding surface 31-1. In other embodiments, the sealant 50 may also cover a part of the first step surface 42 and integrally cover and bond a part of the first end portion 12 and the extended bonding surface 31-1. In the embodiment of the present application, the sealant 50 also covers the end face of one end of the conductive adhesive 60, or the sealant 50 covers the second sub-conductive adhesive 62. In the embodiment of the present application, the sealant 50 functions to seal the first end portion 12 of the display screen 10 and one end of the gap between the display screen 10 and the external circuit, and can prevent acidic or alkaline high-humidity gases or liquids from invading the first end portion 12 of the display screen 10 and the connection line between the display screen 10 and the external circuit component 40. In the embodiment of the present application, the sealant 50 seals the stepped structure, making the combination between the sealant 50 and the stepped structure closer and firmer, and improving the sealing performance of the sealant 50; the sealant 50 can cover the second sub-conductive adhesive 62 to avoid gaps between the sealant 50 and the first end portion 12.

[0081] In the embodiment of the present application, an extended bonding surface 31-1 is formed on the back of the display screen 10 that is not covered by the support film 201, so that the sealant 50 will not cover the protective film 22 when covering the extended bonding surface 31-1. That is, the sealant 50 will not be located on the end surface of the protective film 22 close to the first end 12, nor will it be located on the side of the protective film 22 away from the display screen 10. In other words, the protective film 22 will not contact the sealant 50. In the display module 100 of the embodiment of the present application, in order to reduce the thickness of the display module, or to avoid damage to the protective film 22, or to avoid foreign matter adhering to the side of the protective film 22 away from the display screen 10 during the later assembly or use process, the protective film 22 can be removed. Since the sealant 50 does not cover the protective film 22, it can be prevented that when the protective film 22 is torn off, the protective film 22 is pulled together with the sealant 50, thereby tearing the sealant 50 and causing a gap between the sealant 50 and the first end 12 of the display screen 10. This can prevent acidic or alkaline high-humidity gas or liquid from entering the first end 12 of the display screen 10 and entering between the display screen 10 and the external circuit component 40, and prevent acidic or alkaline high-humidity gas or liquid from corroding the circuit in the display screen 10 and the connection line between the display screen 10 and the external circuit component 40, thereby improving the reliability and stability of the display module 100 and the life of the display module 100. In the embodiment of the present application, after removing the protective film 22, such as Figure 7 As shown, the supporting film 201 is located on the back side of the display screen 10 , and the back side of the display screen 10 not covered by the supporting film 201 forms an extended bonding surface 31 - 1 , and the extended bonding surface 31 - 1 is adjacent to the first end 12 .

[0082] In one embodiment of the present application, Figure 4a and Figure 6aAs shown in the figure, the auxiliary function layer 21 includes a support film 201, and the display module 100 further includes a protective film 22. The support film 201 is located on the back side of the display screen 10; the protective film 22 is located on the side of the support film 201 away from the display screen 10; a partial area of the side of the support film 201 away from the display screen 10 that is not covered by the protective film 22 forms an extended bonding surface 31-2, that is, the projection of the protective film 22 on the auxiliary function layer 21 does not overlap with the extended bonding surface 31-2; the extended bonding surface 31-2 is adjacent to the first end 12. In the embodiment of the present application, the support film 201 forms the extended bonding surface 31-2, and a stepped structure is formed between the support film 201 and the protective film 22, which is convenient for the sealant 50 to seal the first end 12 and the end between the display screen 10 and the external circuit component 40, and prevents acidic or alkaline high-humidity gases or liquids from invading the display screen 10 and the connection line between the display screen 10 and the external circuit component 40 from the first end 12, and prevents acidic or alkaline high-humidity gases or liquids from corroding the internal circuit of the display screen 10 and the connection line between the display screen 10 and the external circuit component 40. In the embodiment of the present invention, the formed extended bonding surface 31-2 enables the sealant 50 to cover the support film 201 when covering the extended bonding surface 31-2, and will not cover the protective film 22. The sealant 50 does not contact the protective film 22, so that the display module 100 will not damage the sealant 50 during the process of tearing off the protective film 22 later, and the situation of the separation of the sealant 50 from the first end 12 will not occur, improving the stability and reliability of the display module 100.

[0083] It should be noted that in the embodiment of the present application, the area of the extended bonding surface 31-2 is less than or equal to the area of the region of the side of the support film 201 away from the display screen 10 that is not covered by the protective film 22.

[0084] In the embodiment of the present application, in order to reduce the thickness of the display module, or to prevent the protective film 22 from being damaged, or to prevent foreign matters from adhering to the side of the protective film 22 away from the display screen 10, the protective film 22 is removed. In the embodiment of the present application, the display module 100 protects the display screen 10, the support film 201, the external circuit component 40 and the sealant 50, as Figure 4b and Figure 6b shown, the support film 201 is located on the back side of the display screen 10; the extended bonding surface 31-2 of the support film 201 is adjacent to the first end 12, the sealant 50 covers at least a part of the first step surface 42, and integrally covers and bonds at least a part of the first end 12, and the sealant 50 extends and covers and bonds the extended bonding surface 31-2. The sealant 50 can also cover and bond the end face of the conductive adhesive 60 or cover and bond the second sub-conductive adhesive 62.

[0085] In an embodiment of the present application, the support film 201 projects onto and covers the edge of the display screen 10 adjacent to the first end portion 12. In the embodiment of the present application, the support film 201 is flush with the first end portion 12 of the display screen 10. During the manufacturing process, the sealant 50 can cover the first step surface 42 and integrally cover and bond the first end portion 12, the end surface of one end of the support film 201, and the extended bonding surface 31-2. In other embodiments, during the manufacturing process, the sealant 50 can cover a part of the first step surface 42 and integrally cover and bond a part of the first end portion 12, a part of the end surface of one end of the support film 201, and the extended bonding surface 31-2.

[0086] In another embodiment of the present application, as Figure 8a and Figure 8b shown, the auxiliary function layer 21 includes a support film 201. A first extended bonding surface 33 is formed on the side of the support film 201 facing away from the display screen 10, and a second extended bonding surface 34 is formed on the portion of the back surface of the display screen 10 not covered by the support film 201. The sealant 50 covers the first step surface 42 and integrally covers and bonds the first end portion 12; and the sealant 50 extends and covers and bonds the first extended bonding surface 33 and the second extended bonding surface 34. In other embodiments, the sealant 50 covers a part of the first step surface 42 and integrally covers and bonds a part or all of the first end portion 12; and the sealant 50 extends and covers and bonds the second extended bonding surface 34 and the first extended bonding surface 33.

[0087] Specifically, in the embodiment of the present application, as Figure 8aAs shown, the display module 100 also includes a protective film 22, which is located on the side of the auxiliary function layer 21 away from the display screen 10. The first extended bonding surface 33 is formed by a partial area of ​​the support film 201 on the side facing away from the display screen 10 that is not covered by the protective film 22, that is, the projection of the protective film 22 on the auxiliary function layer 21 does not overlap with the first extended bonding surface 33. The projection of the support film 201 on the display screen 10 does not cover a partial area of ​​the display screen 10 adjacent to the first end 12, and a second extended bonding surface 34 is formed on the back of the partial area of ​​the display screen 10 adjacent to the first end 12. In the embodiment of the present application, the first step surface 42, the second extended bonding surface 34 and the first extended bonding surface 33 together constitute a step structure in the area adjacent to the first end 12, so that the sealant 50 can contact the first step surface 42, the second extended bonding surface 34 and the first extended bonding surface 33 during the manufacturing process. By setting two extended bonding surfaces, the bonding strength between the sealant 50 and the external circuit component 40, the display screen 10 and the auxiliary function layer 21 is increased, the probability of cracks between the sealant 50 and the display screen 10 is reduced, and the sealing stability of the sealant 50 is improved. At the same time, by setting two extended bonding surfaces, the occurrence of a gap between the sealant 50 and the first end 12 caused by the overflow of the conductive adhesive 60 can also be improved. It can prevent acidic or alkaline high-humidity gas or liquid from invading the circuit of the display screen 10 from the first end 12 of the display screen 10, and prevent acidic or alkaline high-humidity gas or liquid from invading the connection line between the display screen 10 and the external circuit component 40. In the embodiment of the present application, the sealant 50 covers at least a portion of the first step surface 42, and integrally covers at least a portion of the bonding first end 12, the second extended bonding surface 34, at least a portion of the end surface of one end of the support film 201, and the first extended bonding surface 33. In the embodiment of the present application, the sealant 50 also covers the bonding second sub-conductive adhesive 62, and in other embodiments, the sealant 50 can also cover the end surface of the bonding conductive adhesive 60.

[0088] In the embodiment of the present application, in the direction D1 from the first step surface 42 to the second binding area 41, the sum of the size of the first extended bonding surface 33 and the size of the second extended bonding surface 34 is greater than the manufacturing precision of the sealant 50. This ensures that the display sealant 50 will not be formed on the protective film 22 during the manufacturing process, and the display module 100 will not be accompanied by the sealant 50 during the later removal of the protective film 22. Figure 8bAs shown, after removing the protective film 22, the sealant 50 still covers at least a part of the first step surface 42, and integrally covers at least a part of the bonded first end portion 12, the second extended bonding surface 34, at least a part of the end surface of one end of the support film 201, and the first extended bonding surface 33. That is, removing the sealant 50 will not cause a gap between the sealant 50 and the first end portion 12, so that acidic or alkaline high-humidity gases or liquids will not invade the display screen 10 and the connection line between the display screen 10 and the external circuit component 40 from the first end portion 12.

[0089] In another embodiment of the present application, as Figure 9 shown, the auxiliary function layer 21 includes a support film 201. The support film 201 is located on the back surface of the display screen 10. The support film 201 includes a first support portion 211 and a second support portion 212. The first support portion 211 is adjacent to the first end portion 12; there is a gap between the second support portion 212 and the first support portion 211, and the second support portion 212 is located on the side of the first support portion 211 away from the first end portion 12; the extended bonding surface 31 includes a surface 2111 of the first support portion 211 facing away from the display screen 10 and a partial area of the back surface 13 of the display screen 10 at the gap position. In other embodiments, the extended bonding surface 31 may also include the surface 2111 of the first support portion 211 facing away from the display screen 10 and the entire area of the back surface 13 of the display screen 10 at the gap position. In the embodiment of the present application, the support film 201 is provided with the spaced first support portion 211 and the second support portion 212, so that the sealant 50 can cover and bond the surface 2111 (the back surface of the first support portion 211) of the first support portion 211 facing away from the display screen 10 and a partial area of the display screen 10 at the gap position. The sealant 50 can cover at least a part of the first step surface 42, and integrally cover and bond at least a part of the first end portion 12 of the display screen 10, at least a part of the two end surfaces of the first support portion 211, at least a part of the back surface of the first support portion 211, and at least a part of the back surface 13 of the display screen 10 at the gap position. Among them, the two end surfaces of the first support portion 211 are respectively adjacent to the back surface of the first support portion 211. In the display module of the present application, by providing the first support portion 211 and the second support portion 212 on the support film 201, the contact area between the sealant 50 and the external circuit component 40, the display screen 10, and the auxiliary function layer 21 can be further increased, and the bonding strength between the sealant 50 and the external circuit component 40, the display screen 10, and the auxiliary function layer 21 can be enhanced.

[0090] In the embodiment of the present application, the display module 100 may further include a protective film 22. The protective film 22 is located on the side of the second support portion 212 away from the display screen 10, and the protective film 22 is not provided on the back surface of the first support portion 211. In the embodiment of the present application, the protective film 22 covers the second support portion 212. In the embodiment of the present application, in the direction from the first step surface 42 to the second bonding region 41, the size of the extended bonding surface 31 is greater than the manufacturing precision of the sealant 50, so that the sealant 50 will not be formed on the protective film 22, and the protective film 22 will not be connected to the sealant 50, so that the protective film 22 will not bring the sealant 50 when removed, and will not affect the sealing stability of the sealant 50. In other embodiments, such as Figure 10 shown, the protective film 22 may also form a stepped structure with the second support portion 212. A partial area on the side of the second support portion 212 away from the display screen 10 that is not covered by the protective film 22 forms a third extended bonding surface 33. In the direction D1 from the first step surface 42 to the second bonding region 41, the sum of the sizes of the extended bonding surface 31 and the third extended bonding surface 33 is greater than the manufacturing precision of the sealant 50. The sealant 50 may cover at least a part of the first step surface 42, and integrally cover at least a part of the first end portion 12 of the bonded display screen 10, at least a part of the two end surfaces of the first support portion 211, at least a part of the back surface of the first support portion 211, at least a part of the back surface 13 of the display screen 10 at the spaced position, and the third extended bonding surface 33. The bonding strength between the sealant 50 and the display screen 10 can be improved, preventing acidic or alkaline high-humidity gases or liquids from corroding the circuit inside the display screen 10 invading from the first end portion 12, and preventing acidic or alkaline high-humidity gases or liquids from invading the connection line between the display screen 10 and the external circuit near the first end portion 12.

[0091] Such as Figure 10 shown, the display module 100 may also remove the protective film 22, and a partial area on the side of the second support portion 212 away from the display screen 10 forms a third extended bonding surface 33. The sealant 50 may cover at least a part of the first step surface 42, and integrally cover at least a part of the first end portion 12 of the bonded display screen 10, at least a part of the two end surfaces of the first support portion 211, at least a part of the back surface of the first support portion 211, at least a part of the back surface 13 of the display screen 10 at the spaced position, and the third extended bonding surface 33.

[0092] In the embodiment of the present application, the external circuit assembly 40 includes a flexible printed circuit board (not shown in the figure). The first bonding region 11 of the display screen 10 has a first pin (not shown in the figure), and the second bonding region 41 of the flexible printed circuit board has a second pin (not shown in the figure); the first pin is electrically connected to the second pin. In the embodiment of the present application, the sealant 50 can prevent acidic or alkaline high-humidity gases or liquids from invading the first pin and the second pin between the flexible printed circuit board and the display screen 10, and avoid corrosion of the first pin and the second pin.

[0093] In other embodiments, the external circuit component 40 may also include a flexible printed circuit board (not shown) and a chip-on-film (not shown). The second bonding area 41 of the chip-on-film is bonded to the first bonding area 11 of the display screen 10, and the flexible printed circuit board is bonded to the chip-on-film.

[0094] As Figure 11 shown, in the display module 100 of the embodiment of the present application, the external circuit component 40 is bent to the back of the display screen 10, which is beneficial to the narrow screen display of the display module 100. Specifically, in the embodiment of the present application, the display screen 10 is bent, and the external circuit component 40 is located on the back of the display screen 10. A protective layer 80 is provided in the bending area of the display screen 10 to improve the stress generated by the bending of the display screen 10. And a cushion block 81 is provided on the back of the display screen 10.

[0095] In the embodiment of the present application, as Figure 11 、 Figure 14 and Figure 15 shown, the display module further includes a cover plate 91, a protective layer 92 and a reinforcing adhesive 93. The cover plate 91 is disposed on the light-emitting surface of the display screen 10. A second stepped surface 911 is formed on the surface of the cover plate 91 that is not covered by the display screen 10 and faces the display screen 10. The second stepped surface 911 is adjacent to the side where the first bonding area 11 (see FIG. 1) is located; the protective layer 92 is disposed on the surface of the auxiliary function layer 21 facing away from the display screen 10. A third stepped surface 23 is formed on the surface of the auxiliary function layer 21 that is not covered by the protective layer 92 and faces the protective layer 92. The third stepped surface 23 is on the same side as the second stepped surface 911; the reinforcing adhesive 93 integrally covers at least a part of the second stepped surface 911, at least a part of the side surfaces of the display screen 10 and the auxiliary function layer 21, and at least a part of the third stepped surface 23.

[0096] In the display module of the embodiment of the present application, the display screen 10 can be further protected by providing the protective layer 92. The projection of the protective layer 92 on the auxiliary function layer 21 does not completely cover the auxiliary function layer 21, so that a third stepped surface 23 is formed on the side of the auxiliary function layer 21, and a stepped structure is formed between the auxiliary function layer 21 and the protective layer 92, which is convenient for the reinforcing adhesive 93 to integrally cover at least a part of the second stepped surface 911, at least a part of the side surface of the display screen 10, at least a part of the side surface of the auxiliary function layer 21 and at least a part of the third stepped surface 23. In the embodiment of the present application, the occurrence of the situation where the reinforcing adhesive 93 overflows or is incompletely coated due to the instability of the glue valve and the fluidity of the reinforcing adhesive 93 during the production of the reinforcing adhesive 93 can be improved. In the embodiment of the present application, by providing stepped structures such as the second stepped surface 911 and the third stepped surface 23, the reinforcing adhesive 93 does not overflow onto the cover plate 91 during production and is completely coated, and the occurrence of the situation of water vapor intrusion caused by incomplete coating of the reinforcing adhesive 93 can be avoided, and the stability of the display module 100 can be improved.

[0097] The reinforcing adhesive 93 in the embodiments of the present application has a water-blocking effect. In other embodiments, the reinforcing adhesive 93 may also have a water-blocking and oxygen-blocking effect.

[0098] In the embodiments of the present application, the material of the protective layer 92 includes copper foil and foam. The foam is located between the copper foil and the auxiliary function layer 21. The protective layer 92 has the function of protecting the display screen 10. At the same time, the protective layer 92 has the function of shielding signals, improving the interference of non-essential signals to the display module 100. In other embodiments, the material of the protective layer 92 may also be other materials. In the embodiments of the present application, there may also be a touch control circuit layer, a polarizer and a planarization layer 94 between the display screen 10 and the cover plate 91. The edges of the touch control circuit layer, the polarizer and the planarization layer 94 may be flush with the edge of the display module 100.

[0099] In the embodiments of the present application, the display module 100 has four sides. Among them, the first side 120 is the side where the bending area formed by bending the external circuit component 40 to the back of the display screen 10 is located; the second side 130 and the third side 140 are both adjacent sides to the first side 120, and the fourth side 150 is the side opposite to the first side 120.

[0100] In the embodiments of the present application, a third stepped surface 23 is provided on both the second side 130 and the third side 140 of the display module 100. In the embodiments of the present application, by further providing the third stepped surface 23 on both the second side 130 and the third side 140, the reinforcing adhesive 93 of the display module 100 on the second side 130 and the third side 140 has better protection performance, can achieve a better water-blocking effect, and improve the performance of the display module 100 in preventing water vapor from invading.

[0101] In other embodiments, the third stepped surface 23 may also be provided on the second side 130 or the third side 140 of the display module 100, or the third stepped surface 23 may be provided on both the second side 130, the third side 140 and the fourth side 140 of the display module 100 to improve the performance of the display module 100 in preventing water vapor from invading.

[0102] As Figure 12 shown, for the display module 100 in the embodiments of the present application, the external circuit component 40 is bent to the back of the display screen 10, and the external circuit component 40 is covered with an insulating tape 82, and the peripheral side of the insulating tape is attached to the back of the display screen 10.

[0103] The display module 100 according to the embodiment of the present application is subjected to reliability tests of acidic or alkaline solutions. Sixteen display modules 100 are taken and divided into two groups, with 8 display modules 100 in each group. The first group of display modules 100 is tested with an acidic solution, and the second group of display modules 100 is tested with an alkaline solution. To improve the erosion of the display screen 10 by acidic or alkaline gases and liquids starting from the first end 12 of the display screen 10, the common solution is as Figure 13a shown in Comparative Sample 1. The difference between the display module 100' of Comparative Sample 1 and the display module 100 of the embodiment of the present application is that the auxiliary function layer 21 is flush with the first end 12 of the display screen 10, and the display module 100' of Comparative Sample 1 does not have an extended bonding surface 31-1 or 31-2 (see Figure 2b and Figure 7 ). The sealant 50 is disposed on the first step surface 42, and there is an easy gap between the sealant 50 and the first end 12. To improve the erosion of the display screen 10 by acidic or alkaline gases and liquids starting from the first end 12 of the display screen 10, there is also a method using Comparative Sample 2 as shown in Figure 1b . The difference between the display module 100' of Comparative Sample 2 and the display module 100 of the embodiment of the present application is that the auxiliary function layer 21 is flush with the first end 12 of the display screen 10, and the display module 100' of Comparative Sample 2 does not have an extended bonding surface 31-1 or 31-2 (see Figure 2b and Figure 7 ). The sealant 50 covers the first end 12 of the display screen 10 and the end of the auxiliary function layer 21, and part of the sealant 50 is attached to the back surface of the support film 201. The protective film 22 (see Figure 1a ) and the support film 201 of the display module 100' of Comparative Sample 2 are flush with the first end 12 of the display screen 10. After the protective film 22 is removed, one end of part of the sealant 50 is attached to the back surface of the support film 201; it is found that after the protective film 22 is removed, there is a gap between one end of part of the sealant 50 and the support film 201, and there is an easy gap between the sealant 50 and the first end 12 of the display screen 10. Specifically, the comparative sample group in the embodiment of the present application includes Comparative Sample 1 and Comparative Sample 2. Comparative Sample 1 includes a third group and a fourth group, and Comparative Sample 2 includes a fifth group and a sixth group. The number of samples in each group is 8. The third group and the fifth group are tested with an acidic solution, and the fourth group and the sixth group are tested with an alkaline solution.

[0104] The specific test method is as follows: As shown in Figure 7 and Figures 12 - 15As shown, acidic or alkaline solutions are respectively dropped on the peripheral sides of the insulating tape 82 outside the external circuit component 40 of the display module 100 in the embodiment of the present application and the display module 100' of the comparative sample group, and on the four sides of the display component 100. The four sides of the display component 100 include a first side 120, a second side 130, a third side 140, and a fourth side 150. The acidic or alkaline solution is dropped once every 2 hours; after each display module 100 is dropped with the acidic or alkaline solution 12 times, the reliability of the display module 100 after 24 hours of acidic or alkaline solution testing is observed. After the reliability test, the first group and the second group of display modules 100 pass the reliability test of the acidic or alkaline solution, and there is no acidic or alkaline solution sample between the display screen 10 and the first bonding area 11 and the second bonding area 41; as Figure 1c and Figure 13b shown, there are acidic or alkaline crystals 101 between the display screen 10 of the comparative sample display modules 100' of the third group, the fourth group, the fifth group, and the sixth group (see Figure 13a ) and the first bonding area 11 and the second bonding area 41. The comparative samples of the third group to the sixth group do not pass the reliability test of the acidic or alkaline solution.

[0105] The embodiment of the present application also includes a second technical solution. As Figure 16 shown, a manufacturing method of a display module includes:

[0106] S110, as Figure 18a shown, provide a display screen 10, the display screen 10 includes a test area 16 and a non-test area 17, wherein the non-test area 17 is close to the end where the first bonding area 11 (see Figure 2a ) of the display screen 10 is located.

[0107] In the embodiment of the present application, the test area 16 includes an array substrate, and the test area 16 does not have light-emitting devices. Some areas of the non-test area 17 close to the test area 16 do not have light-emitting devices, and other areas have light-emitting devices and a packaging layer.

[0108] In the embodiment of the present application, the display screen 10 is divided into the test area 16 and the non-test area 17, and the circuit in the test area 16 can be tested to facilitate testing whether there is an abnormality in the circuit in the array substrate of the display screen 10.

[0109] S120, provide an auxiliary function layer 21 on the back surface of the display screen 10, wherein an extended bonding surface 31-2 is formed on the side of the auxiliary function layer 21 facing away from the display screen 10, and the extended bonding surface 31-2 is at least partially located in the non-test area 17 and is close to the end where the first bonding area 11 is located.

[0110] In the embodiment of the present application, the display screen 10 is a flexible display screen. By providing an auxiliary function layer 21 on the back surface of the display screen 10, the auxiliary function layer 21 can at least support the flexible display screen to prevent the flexible display screen from being wrinkled or damaged. The embodiment of the present application does not limit the function of the auxiliary function layer 21. For example, the auxiliary function layer 21 can further improve the creases formed by bending the flexible display screen.

[0111] In the embodiment of the present application, the auxiliary function layer 21 includes a support film 201. One end of the support film 201 is flush with the end of the test area 16 away from the non-test area 17. The support film 201 covers the test area 16 and extends integrally to the non-test area 17. In an embodiment of the present application, the support film 201 integrally covers the back surface of the display screen 10. In another embodiment, as Figure 19a shown, it is also possible that in the bending area 18 of the display screen 10, the support film 201 is in a disconnected state.

[0112] In the embodiment of the present application, a protective film 22 is further provided on the side of the auxiliary function layer 21 facing away from the display screen 10. The projection of the protective film 22 on the auxiliary function layer 21 does not overlap with the extended bonding surface 31-2. The protective film 22 is used to protect the support film 201 to prevent the auxiliary function layer 21 from being damaged or scratched during transportation. The protective film 22 can also be used to protect the auxiliary function layer 21 to prevent foreign objects from being adsorbed on the auxiliary function layer 21.

[0113] Specifically, in the embodiment of the present application, the protective film 22 is provided on the side of the support film 201 facing away from the display screen 10. The protective film 22 does not cover the end of the non-test area 17 close to the first bonding area 11, so that the support film 201 of the non-test area 17 forms an extended bonding surface 31-2. In the embodiment of the present application, the protective film 22 also does not cover the support film 201 of the test area 16, that is, the extended bonding surface 31-2 is located between the non-test area 17 and the test area 16. In other embodiments, the protective film 22 can also be divided into two sections. One section of the protective film 22 is located in the non-test area 17 and does not cover the end of the non-test area 17 close to the first bonding area 11; the other section of the protective film 22 covers the support film 201 of the test area 16.

[0114] When the auxiliary function layer 21 is provided on the back surface of the display screen 10, the test area 16 of the display screen 10 can be tested to detect whether there is an abnormality in the circuit of the display screen 10.

[0115] S130, as Figure 18a 、 Figure 18b 、 Figure 19a and Figure 19b shown, cut off the display screen 10 of the test area 16, or cut off the display screen 10 and the auxiliary function layer 21 of the test area 16, the first bonding area 11 (see Figure 2a) and the first end portion 12 of the display screen 10 where the extended bonding surface 31-2 is adjacent to the non-test area 17.

[0116] In the embodiment of the present application, after the test area 16 of the display screen 10 is tested, the test area 16 can be cut off. Specifically, the test area 16 of the display screen 10 and at least part of the auxiliary function layer 21 are cut off. In the embodiment of the present application, cutting is performed along the cutting line 19 to cut off the test area 16. Specifically, in the embodiment of the present application, the cutting line 19 is the edge line of the test area 16, and this edge line is on the side close to the non-test area 17. In other embodiments, the cutting line 19 can also be located at other positions between the test area 16 and the non-test area 17.

[0117] In the embodiment of the present application, by cutting along the cutting line 19, the display screen 10 in the test area 16 is separated from the display screen 10 in the non-test area 17. When the test area 16 has a support film 201, the display screen 10 and the support film 201 in the test area 16 can be cut off simultaneously. When the test area 16 has a support film 201 and a protective film 22, the display screen 10, the support film 201 and the protective film 22 in the test area 16 can be cut off simultaneously.

[0118] In the embodiment of the present application, after cutting along the cutting line 19, the end of the display screen 10 in the non-test area 17 close to the cutting line 19 is the first end portion 12. The auxiliary function layer 21 in the non-test area 17 has an extended bonding surface 31-2, and the extended bonding surface 31-2 is adjacent to the first end portion 12 of the display screen 10. The area of the support film 201 in the non-test area 17 adjacent to the first end portion 12 that is not covered by the protective film 22 forms the extended bonding surface 31-2.

[0119] S140, as Figure 2b shown, bind the first bonding area 11 of the display screen 10 in the non-test area 17 to the second bonding area 41 of the external circuit component 40. The part of the external circuit component 40 that extends beyond the first end portion 12 of the display screen 10 forms a first stepped surface 42.

[0120] In the embodiment of the present application, the first bonding area 11 of the display screen 10 in the non-test area 17 has a first pin, and the second bonding area 41 of the external circuit component 40 has a second pin. The first pin and the second pin are electrically connected. As Figure 4a and Figure 6a shown, in an embodiment of the present application, a conductive adhesive 60 is further provided between the first bonding area 11 and the second bonding area 41 to further improve the connection stability between the first bonding area 11 and the second bonding area 41.

[0121] S150, fabricate a sealant 50 such that the sealant 50 covers at least a part of the first stepped surface 42, and integrally covers at least a part of the first end portion 12 and the extended bonding surface 31-2.

[0122] In the embodiment of the present application, the sealant 50 is sprayed by a glue valve, so that the sealant 50 integrally covers a part of the first step surface 42, a part of the first end 12, and the extended bonding surface 31-2. In other embodiments, the sealant 50 integrally covers and bonds the entire first step surface 42, the entire first end 12, or the extended bonding surface 31-2. In the embodiment of the present application, the sealant 50 does not cover the protective film 22, so that when the protective film 22 is removed in the later stage of the display module 100, the protective film 22 will not drive the sealant 50.

[0123] In the manufacturing method of the embodiment of the present application, the extended bonding surface 31-2 is formed on the auxiliary function layer 21 in the non-test area 17, so that the sealant 50 can cover the extended bonding surface 31-2 during manufacturing processes such as spraying, and at the same time integrally cover the first end 12 of the display screen 10 and the first step surface 42 of the external circuit component 40. The sealant 50 in the embodiment of the present application can effectively seal the end surface of the first end 12 of the display screen 10. It improves the quality and reliability of the display module 100, extends the service life of the display module 100, and does not increase the manufacturing process.

[0124] In a specific embodiment of the present application, a nozzle (not shown in the figure) is placed above the display module 100, and the orthographic projection of the nozzle on the display module 100 is located on the first step surface 42, and the sealant 50 is sprayed, so that the sealant 50 flows from the first step surface 42 to the first end 12 and the extended bonding surface 31-2. In the embodiment of the present application, a spraying device is used to spray the sealant 50. Placing the nozzle of the spraying device above the first step surface 42 can make the sealant 50 first contact the first step surface 42. As the spraying device continues to spray the sealant 50, the sealant 50 spreads from the first step surface 42 to the first end 12 and further spreads to the extended bonding surface 31-2. In the manufacturing process of the sealant 50 in the embodiment of the present application, since one end of the first step surface 42 and the first end 12 are at the same height, and the height of other areas of the first end 12 is higher than that of the first step surface 42, when the sealant 50 spreads from the lower-height first step surface 42 to the first end 12, due to the fluidity of the colloid, the sealant 50 can spread onto the first end 12, so that while the sealant 50 adheres to the first step surface 42, the sealant 50 can adhere to the junction of the first step surface 42 and the first end 12 and cover and bond the first end 12, so that the sealant 50 adheres to the first end 12 and the first step surface 42, and there is no gap between the sealant 50 and the first end 12 and the first step surface 42, especially there is no gap between the contact portion of the first end 12 and the first step surface 42 and the sealant 50.

[0125] In the embodiment of the present application, when the sealant 50 spreads from the first end 12 to the extended bonding surface 31-2, since the highest end of the first end 12 is at the same height as the extended bonding surface 31-2, and the heights of other regions of the first end 12 are lower than the extended bonding surface 31-2, when the sealant 50 spreads from the first end 12 with a lower height to the extended bonding surface 31-2, due to the fluidity of the colloid, the sealant 50 can spread onto the extended bonding surface 31-2, so that the sealant 50 can adhere to the junction of the first end 12 and the extended bonding surface 31-2 and cover and bond to the extended bonding surface 31-2, such that the sealant 50 adheres to the first end 12 and the first step surface 42, and there is no gap between the sealant 50 and the first end 12 and the extended bonding surface 31-2. By placing the nozzle of the spraying device above the first step surface 42 to make the sealant 50, the sealant 50 can preferably integrally cover and bond at least a part of the first step surface 42, at least a part of the first end 12, and the extended bonding surface 31-2, and there will be no gaps or voids caused by the manufacturing process between the sealant 50 and the first step surface 42, the first end 12, and the extended bonding surface 31-2. Thus, the sealing effect of the sealant 50 for sealing the first end 12 can be improved, the quality and reliability of the display module 100 can be enhanced, and the service life of the display module 100 can be prolonged.

[0126] In another embodiment of the present application, as Figure 17 shown, a manufacturing method of a display module 100 includes:

[0127] S210, as Figure 20a shown, provide a display screen 10, and the display screen 10 includes a test area 16 and a non-test area 17.

[0128] The steps are the same as those of S110 in the above embodiment and will not be elaborated here.

[0129] S220, arrange an auxiliary function layer 21 on the back surface of the display screen 10. Among them, an opening 24 is formed on the auxiliary function layer 21, so that a part of the back surface of the display screen 10 that is not covered by the auxiliary function layer 21 corresponding to the opening forms an extended bonding surface 31-1. The extended bonding surface 31-1 is at least partially located in the non-test area 17 and is close to the end where the first bonding area 11 is located.

[0130] In the embodiment of the present application, the display screen 10 is a flexible display screen. By arranging the auxiliary function layer 21 on the back surface of the display screen 10, the auxiliary function layer 21 can at least support the flexible display screen to prevent the flexible display screen from wrinkling or being damaged.

[0131] In the embodiment of the present application, the auxiliary functional layer 21 includes a first auxiliary part (not marked in the figure) and a second auxiliary part (not marked in the figure), the first auxiliary part at least covers the display screen 10 in the test area 16, and the second auxiliary part is superimposed on the display screen 10 in the non-test area 17. There is a gap (not marked in the figure) between the first auxiliary part and the second auxiliary part, and the back part of the display screen 10 at the gap position forms an extended bonding surface 31-1.

[0132] In a specific embodiment of the present application, the first auxiliary portion just covers the display screen 10 in the test area 16. The second auxiliary portion does not completely cover the display screen 10 in the non-test area 17, so that the back of the display screen 10 in the non-test area 17 that is not covered by the auxiliary functional layer 21 forms an extended bonding surface 31-1.

[0133] In the embodiment of the present application, the auxiliary function layer 21 includes a support film 201, and the display module 100 also includes a protective film 22, and the protective film 22 is located on the side of the auxiliary function layer 21 away from the display screen 10. In the embodiment of the present application, the support film 201 is divided into three sections, wherein the first section of the support film 214 is located in the test area 16, the second section of the support film 215 and the third section of the support film 216 are both located in the non-test area 17, and there is a gap between the second section of the support film 215 and the first section of the support film 214, and the gap makes the part of the back of the display screen 10 not covered by the support film 201 form an extended bonding surface 31-1. There is a gap between the third section of the support film 216 and the second section of the support film 214, and the gap is located in the bending area 18 of the display screen 10. In the embodiment of the present application, the protective film 22 integrally covers the second section of the support film 215 and the third section of the support film 216. In the embodiment of the present application, the protective film 22 is flush with the end surface of the second section of the support film 201. As Figure 22a As shown, in other embodiments, the protective film 22 may not completely cover the second section of the supporting film 201, so that the area of ​​the second section of the supporting film 201 not covered by the protective film 22 forms a third step surface 32. Figure 20a As shown, in the embodiment of the present application, the first section of the supporting film 214 belongs to the first auxiliary part; the second section of the supporting film 215, the third section of the supporting film 216 and the protective film 22 belong to the second auxiliary part.

[0134] In other embodiments, Figure 21a As shown, the support film 201 can also be divided into two sections, wherein the first section of the support film 214 is located in the test area 16, and the second section of the support film 215 is located in the non-test area 17. There is a gap between the second section of the support film 215 and the first section of the support film 214, and the gap makes the portion of the back of the display screen 10 not covered by the support film 201 form an extended bonding surface 31-1. In the embodiment of the present application, the first section of the support film 201 belongs to the first auxiliary part; the second section of the support film 215 and the protective film 22 belong to the second auxiliary part.

[0135] In another embodiment, ifFigure 23a As shown, the first-stage support film 201 covers the display screen 10 of the test area 16 and integrally extends to cover a part of the display screen 10 of the non-test area 17.

[0136] S230, as Figure 20a and Figure 20b shown, cut off the display screen 10 of the test area 16, or cut off the display screen 10 of the test area 16 and the auxiliary function layer 21. The first binding area 11 (see Figure 2a ) and the first end 12 of the extended bonding surface 31-1 adjacent to the display screen 10 of the non-test area 17.

[0137] In the embodiment of the present application, the cutting line 19 is the edge line of the test area 16 close to the non-test area 17. In other embodiments, the cutting line 19 may also be located at other positions.

[0138] In the embodiment of the present application, cut along the cutting line 19 to cut off the display screen 10 of the test area 16 and at least a part of the first auxiliary part of the test area 16. The part of the back surface of the display screen 10 of the non-test area 17 that is not covered by the auxiliary function layer 21 forms the extended bonding surface 31-1.

[0139] In another embodiment, as Figure 22a and Figure 22b shown, the area of the second-stage support film 215 not covered by the protective film 22 forms the first extended bonding surface 33, and the part of the back surface of the display screen 10 of the non-test area 17 not covered by the support film 201 forms the second extended bonding surface 34.

[0140] In still another embodiment, as Figure 23a and Figure 23b shown, when the first-stage support film 214 covers the display screen 10 of the test area 16 and integrally extends to cover a part of the display screen 10 of the non-test area 17, cut along the cutting line 19, and the first-stage support film 214 is cut and separated, so that the first-stage support film 201 located in the non-test area 17 forms the first support part 211.

[0141] S240, as Figure 3 shown, bind the first binding area 11 of the display screen 10 of the non-test area 17 to the second binding area 41 of the external circuit component 40. The part of the external circuit component 40 that extends beyond the first end 12 of the display screen 10 forms the first step surface 42.

[0142] It is the same as step S140 of the above embodiment and will not be elaborated here.

[0143] S250, as Figure 3 shown, make the sealant 50 so that the sealant 50 covers at least a part of the first step surface 42 and integrally covers at least a part of the bonded first end 12 and the extended bonding surface 31-1.

[0144] In the embodiment of the present application, the sealant 50 is sprayed by a glue valve, so that the sealant 50 integrally covers a part of the first step surface 42, a part of the first end 12, and the extended bonding surface 31-1. In another embodiment, the sealant 50 integrally covers the entire first step surface 42, the entire first end 12, and the extended bonding surface 31-1. In the embodiment of the present application, the sealant 50 does not cover the protective film 22, so that when the protective film 22 is removed in the later stage of the display module 100, the protective film 22 will not drive the sealant 50. In still another embodiment, as Figure 9 shown, the sealant 50 may also integrally cover at least a part of the first step surface 42 that bonds the first step surface 42, at least a part of the first end 12, at least a part of the two ends of the first support portion 211, at least a part of the surface 2111 of the first support portion 211 facing away from the display screen 10, and at least a part of the back surface of the display screen 10 at the spaced position, wherein the extended bonding surface 31 includes the surface 2111 of the first support portion 211 facing away from the display screen 10 and the back surface of the display screen 10 at the spaced position. As Figure 8a shown, in still another embodiment, the sealant 50 integrally covers at least a part of the first step surface 42, at least a part of the first end 12, at least a part of the extended bonding surface 31-1, and at least a part of the third step surface 32.

[0145] The manufacturing method of the embodiment of the present application forms the extended bonding surface 31-1 on the part of the back surface of the display screen 10 that is not covered by the auxiliary function layer 21, so that the sealant 50 can be covered and bonded to the extended bonding surface 31-1 during manufacturing processes such as spraying, and at the same time integrally cover and bond the first end 12 of the display screen 10 and the first step surface 42 of the external circuit component 40. The sealant 50 of the embodiment of the present application can effectively seal the end surface of the first end 12 of the display screen 10. The stability and reliability of the display module 100 are improved, the service life of the display module 100 is extended, and the manufacturing process is not increased.

[0146] The embodiment of the present application further includes a third technical solution, a display device, a driving circuit and the above-mentioned display module 100, and the driving circuit is used to drive the display module 100. In the display device of the embodiment of the present application, by forming an extended bonding surface 31-2 on the side of the auxiliary function layer 21 facing away from the display screen 10 or forming an extended bonding surface 31-2 on the back surface of the display screen 10 not covered by the auxiliary function layer 21, and making the sealant 50 cover at least a part of the first step surface 42, and the sealant 50 further extends to cover at least a part of the first end 12 and the extended bonding surface 31 or 31-2, so that the sealant 50 of the display module 100 in the embodiment of the present application can effectively seal the end surface of the first end 12 of the display screen 10. And integrally seal the gap between the external circuit component 40 and the display screen 10 at the end. It can prevent acidic or alkaline high-humidity gases or liquids from entering the inside of the display screen 10 from the first end 12 of the display screen 10, corrode the circuit inside the display screen 10, affect the display of the display screen 10, and further affect the display of the display device. The embodiment of the present application can improve the stability and reliability of the display device and extend the service life of the display device.

[0147] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A display module, characterized in that, it includes: A display screen, on the side where the light-emitting surface of the display screen is located, there is a first bonding area, and the first bonding area is adjacent to the first end of the display screen; An auxiliary function layer, which is arranged on the back side of the display screen, and an extended bonding surface is formed on the side of the auxiliary function layer facing away from the display screen; An external circuit component, the external circuit component is provided with a second bonding area, and the external circuit component is bonded and connected to the first bonding area of the display screen through the second bonding area, and the part of the external circuit component exceeding the first end of the display screen forms a first stepped surface; Sealant, the sealant covers at least a part of the first stepped surface, integrally covers and bonds at least a part of the first end, and the sealant extends and covers and bonds the extended bonding surface; Wherein, the end of the auxiliary function layer is flush with the first end of the display screen. In the direction of the first stepped surface pointing to the second bonding area, the size of the extended bonding surface is greater than the manufacturing precision of the sealant, and the sealant covers and bonds the extended bonding surface.

2. The display module according to claim 1, characterized in that, The auxiliary function layer includes a support film, a first extended bonding surface is formed on the side of the support film facing away from the display screen, and a second extended bonding surface is formed on the part of the back of the display screen not covered by the support film; The sealant covers at least a part of the first stepped surface, integrally covers and bonds at least a part of the first end; and the sealant extends and covers and bonds the first extended bonding surface and the second extended bonding surface.

3. The display module according to claim 2, characterized in that, In the direction of the first stepped surface pointing to the second bonding area, the sum of the sizes of the first extended bonding surface and the second extended bonding surface is greater than the manufacturing precision of the sealant.

4. The display module according to claim 1, characterized in that, The auxiliary function layer includes a support film, the support film is located on the back of the display screen, and the support film includes: A first support part, the first support part is adjacent to the first end; A second support part, there is a gap between the second support part and the first support part, and the second support part is located on the side of the first support part away from the first end; The extended bonding surface includes at least a part of the area of the surface of the first support part facing away from the display screen and at least a part of the area of the back of the display screen at the gap position; The sealant covers at least a part of the first stepped surface, integrally covers and bonds at least a part of the first end of the display screen, at least a part of the two end faces of the first support part, at least a part of the back of the first support part, and at least a part of the back of the display screen at the gap position, wherein the two end faces of the first support part are respectively adjacent to the back of the first support part.

5. The display module according to claim 1, characterized in that, it includes: Conductive adhesive, the conductive adhesive is located between the first bonding area and the second bonding area; Or A part of the conductive adhesive is located between the first bonding area and the second bonding area, and the other part is exposed at the first end portion, and the sealant covers and bonds the other part of the conductive adhesive.

6. The display module according to claim 1, wherein, further comprising: a protective film located on a side of the auxiliary function layer facing away from the display screen.

7. The display module according to claim 6, wherein, when an extended bonding surface is formed on a side of the auxiliary function layer facing away from the display screen, a projection of the protective film on the auxiliary function layer does not overlap with the extended bonding surface.

8. The display module according to claim 1, wherein, further comprising: a cover plate disposed on a light-emitting surface of the display screen, a second stepped surface is formed on a surface of the cover plate that is not covered by the display screen and faces the display screen, and the second stepped surface is adjacent to a side where the first bonding area is located; a protective layer disposed on a surface of the auxiliary function layer facing away from the display screen, a third stepped surface is formed on a surface of the auxiliary function layer that is not covered by the protective layer and faces the protective layer, and the third stepped surface is on the same side as the second stepped surface; a reinforcing adhesive that integrally covers at least a part of the second stepped surface, at least a part of a side surface of the display screen and the auxiliary function layer, and at least a part of the third stepped surface.

9. A manufacturing method of a display module, wherein, comprising: providing a display screen, the display screen includes a test area and a non-test area, wherein the non-test area is close to an end where the first bonding area of the display screen is located; providing an auxiliary function layer on a back surface of the display screen, wherein an extended bonding surface is formed on a side of the auxiliary function layer facing away from the display screen, and the extended bonding surface is at least partially located in the non-test area and is close to the end where the first bonding area is located; removing the display screen in the test area, or removing the display screen in the test area and the auxiliary function layer, the first bonding area and the extended bonding surface are adjacent to a first end portion of the display screen in the non-test area; an end portion of the auxiliary function layer is flush with the first end portion of the display screen; bonding the first bonding area of the display screen in the non-test area to a second bonding area of an external circuit component, and a part of the external circuit component that extends beyond the first end portion of the display screen forms a first stepped surface; manufacturing a sealant such that the sealant covers at least a part of the first stepped surface, and integrally covers and bonds at least a part of the first end portion and the extended bonding surface; wherein, in a direction from the first stepped surface to the second bonding area, a dimension of the extended bonding surface is greater than a manufacturing precision of the sealant.

10. The manufacturing method of the display module according to claim 9, wherein, the auxiliary function layer includes a first auxiliary part and a second auxiliary part, providing the auxiliary function layer on the back surface of the display screen includes: A first auxiliary part and a second auxiliary part are respectively formed on the back surface of the display screen. The first auxiliary part covers at least the display screen in the test area, and the second auxiliary part is stacked on the display screen in the non-test area. There is a gap between the first auxiliary part and the second auxiliary part, and an extended bonding surface is formed on the back surface of the display screen at the gap position. The cutting of the display screen and the auxiliary function layer in the test area includes: Cutting the display screen in the test area and at least a part of the first auxiliary part in the test area.

11. The manufacturing method of the display module according to claim 9, characterized in that, The manufacturing of the sealant includes: Placing a nozzle above the display module and making the orthographic projection of the nozzle on the display module located on the first step surface, and spraying the sealant so that the sealant flows from the first step surface to the first end part and the extended bonding surface.

12. A display device, characterized in that, It includes a driving circuit and the display module according to any one of claims 1-8, and the driving circuit is used to drive the display module.

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