Display module, preparation method thereof and display device

Abstract

The invention provides a display module and a preparation method thereof, and a display device. The display module comprises a cover plate; a display panel; the protection glue is located between the cover plate and the display panel; the ink layer is located between the protective glue and the cover plate; the protective glue and the ink layer contain epoxy groups, and a chemical cross-linking structure is formed between the protective glue and the ink layer through a polyamino cross-linking agent. A stable and reliable chemical cross-linked network is formed at the interface of the protective glue and the ink layer, and the interlayer bonding force is improved, so that the peeling problem of peeling or falling off between layers is solved, the reliability and the display yield of the display module and the display device comprising the display module are remarkably improved, and the display effect is effectively improved.

Description

Technical Field

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

[0002] In recent years, in order to meet diverse display needs, display devices with different functions have emerged, providing great convenience for people's lives and work. Intelligence, portability, and flexibility are the main development directions of display devices. At the same time, with the continuous development of display technology, narrow bezels and high screen-to-body ratio designs have also become an important way to improve users' visual experience.

[0003] During the preparation of narrow-frame display modules, the edges must be sealed with glue to improve the overall structural strength and stability of the module, while also providing protection by blocking external moisture and oxygen from entering the display module and preventing corrosion of its internal structure. However, the adhesive layer formed by the sealant has weak adhesion to the components and ink layers within the display module, seriously affecting the reliability of the display module and causing separation or shedding between layers, known as peeling, which in turn leads to poor display performance. Therefore, solving the peeling problem in display modules and providing display devices with improved reliability and display quality are key research areas in this field. Summary of the Invention

[0004] In order to solve the peeling problem of a display module and provide a display device with better reliability and display effect, one of the objectives of the present invention is to provide a display module, which includes: a cover plate; a display panel; a protective glue located between the cover plate and the display panel; and an ink layer located between the protective glue and the cover plate; the protective glue and the ink layer contain epoxy groups, and a chemical cross-linking structure is formed between the protective glue and the ink layer via a polyamino cross-linking agent.

[0005] In the display module provided by the present invention, the protective glue is located between the cover plate and the display panel and is arranged around the edge of the display panel. The ink layer is located between the protective glue and the cover plate. Both the ink layer and the protective glue contain epoxy groups, and a chemical cross-linking structure is formed between the layers through a polyamino cross-linking agent, so that a stable and reliable chemical cross-linking network is formed at the interface between the ink layer and the protective glue, thereby improving the interlayer adhesion, thereby solving the problem of peeling or falling off between layers, that is, solving the peeling problem, significantly improving the reliability and display yield of the display module and the display device containing it, and effectively improving the display effect.

[0006] A second object of the present invention is to provide a method for preparing the display module according to the first object, the method comprising:

[0007] Providing a modified ink comprising a combination of an ink containing epoxy groups and a polyamino crosslinking agent;

[0008] Applying the modified ink on the surface of the cover plate to obtain a cover plate with an ink layer;

[0009] After the cover plate with the ink layer is assembled with the display panel, the protective glue containing epoxy groups is molded by an injection molding process to obtain the display module.

[0010] A third object of the present invention is to provide another method for preparing the display module according to the first object, the method comprising:

[0011] providing a cover plate with an ink layer;

[0012] coating the polyamino crosslinking agent on the ink layer to form a crosslinking agent layer, thereby obtaining a cover plate with a composite layer;

[0013] After assembling the cover plate with the composite layer and the display panel, the protective glue containing epoxy groups is molded by an injection molding process to obtain the display module.

[0014] A fourth object of the present invention is to provide a display device, comprising at least one of the display module described in the first object and the display module prepared by the preparation method described in the second or third object.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] In the display module provided by the present invention, the protective glue and the ink layer contain epoxy groups, and a chemical cross-linking structure is formed between the protective glue and the ink layer through a polyamino cross-linking agent, so that a stable and reliable chemical cross-linking network is formed at the interface between the ink layer and the protective glue, thereby improving the interlayer adhesion, thereby solving the peeling problem of peeling or falling off between layers, significantly improving the reliability and display yield of the display module and the display device containing the same, and effectively improving the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a display module provided in one embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of a display module provided in another embodiment of the present invention;

[0019] Among them, 10-cover plate, 20-display panel, 201-polarizer, 202-display substrate, 203-support heat dissipation component, 30-protective adhesive, 40-ink layer, 50-optical adhesive layer;

[0020] Figure 3A schematic flow chart of a method for preparing a display module provided in one embodiment of the present invention;

[0021] Figure 4 A schematic flow chart of a method for preparing a display module according to another embodiment of the present invention. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0023] In the present invention, the terms "upper", "lower", "inside", "outside", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present invention.

[0024] In the present invention, unless otherwise expressly specified or limited, terms such as "connected," "connect," "mounted," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0025] When “including,” “having,” or “comprising” is used herein, another component may be added unless a clear limiting term such as “only,” “consisting of,” etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as having one number.

[0026] After research, the present invention discovered that during the preparation of narrow-frame display modules, it is necessary to seal the edges with glue to improve the overall structural strength and stability of the module, provide protection, and block external water and oxygen from entering the display module, thereby preventing water and oxygen from corroding its internal structure. However, the adhesive layer structure formed by the sealant has a weak bonding strength with the ink layer in the display module, and the layers are prone to peeling or falling off. In particular, after reliability tests such as the Thermal Shock Test (TST), the double 85 (85°C, 85% humidity) test, and the HAST test (Highly Accelerated Stress Test), the glue layer turns white and can be manually peeled off, resulting in a peeling problem, which in turn leads to poor display, seriously affecting the reliability and yield of the display module.

[0027] In order to solve the above technical problems, the present invention proposes a technical solution in the embodiments. The embodiments of the present invention provide a display module, wherein a protective glue is located between a cover plate and a display panel and is arranged around the edge of the display panel, and an ink layer is located between the protective glue and the cover plate; the ink layer and the protective glue both contain epoxy groups, and a chemical cross-linking structure is formed between the ink layer and the protective glue through a polyamino cross-linking agent, so that a stable and reliable chemical cross-linking network is formed at the interface between the layers, thereby improving the interlayer adhesion and stability, thereby solving the peeling problem between layers, significantly improving the reliability and yield of the display module and the display device containing the same, and optimizing the display effect.

[0028] In order to make the above-mentioned purpose, features and effects of the present invention more obvious, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings of the present invention are not necessarily drawn according to the actual scale.

[0029] Figure 1 A schematic diagram of the structure of a display module provided in one embodiment of the present invention is shown in FIG. Figure 1 As shown, the display module includes: a cover plate 10, a display panel 20, a protective adhesive 30, and an ink layer 40. The protective adhesive 30 is located between the cover plate 10 and the display panel 20, and the ink layer 40 is located between the protective adhesive 30 and the cover plate 10. Both the protective adhesive 30 and the ink layer 40 contain epoxy groups, and a chemical cross-linking structure is formed between the protective adhesive 30 and the ink layer 40 via a polyamino cross-linking agent.

[0030] In the display module employing the above-described technical solution, the protective adhesive 30 is positioned between the cover plate 10 and the display panel 20, and is disposed around the edge of the display panel 20. This adhesive enhances the overall structural strength and stability of the module while also providing protection, blocking external water and oxygen from entering the display module and preventing water and oxygen from corroding the module's internal structure. The protective adhesive 30 is in contact with the ink layer 40, both of which contain epoxy groups. By introducing a polyamino crosslinking agent, the amino groups undergo a ring-opening reaction with the epoxy groups in the protective adhesive and ink layers, respectively, forming a chemically crosslinked structure between the layers. This creates a stable and reliable chemically crosslinked network, enhancing interlayer adhesion and thereby resolving the peeling problem, which can occur between layers. This significantly improves the reliability of the display module and the display device incorporating it, enabling it to pass various reliability tests, improving display yield, and optimizing display effects.

[0031] It should be noted that the present invention does not specifically limit the type of cover plate 10, and all cover plates known in the prior art can be used in the present invention. In a specific implementation, the type of cover plate 10 can be conventionally selected according to demand, and a material with good light transmittance is used, including but not limited to: a glass cover plate, a plastic cover plate, a flexible cover plate, etc. The material of the plastic cover plate includes but is not limited to: any one or a combination of at least two of polycarbonate (PC), polyimide (PI), polyethylene terephthalate (PET), and polymethyl methacrylate (PMMA). In a specific implementation, the thickness of the cover plate 10 can be selected according to demand. In addition, the surface of the cover plate 10 can be a plane, or one or two surfaces can be set to a certain curvature as needed.

[0032] The present invention does not impose any particular limitation on the type of display panel 20. Any display panel in the prior art that has a display effect can be used in the present invention. In a specific implementation, the type of display panel 20 can be conventionally selected and set according to display requirements.

[0033] In some optional embodiments of the present invention, the display panel includes a polarizer, a display substrate and a supporting heat dissipation component arranged in sequence, and the polarizer and the cover plate are connected by an optical adhesive layer; the protective adhesive is located between the cover plate and the display panel and is arranged around the edges of the polarizer, display substrate and supporting heat dissipation component.

[0034] like Figure 2 As shown, Figure 2This is a schematic structural diagram of a display module provided in another embodiment of the present invention, comprising: a cover plate 10, a display panel 20, a protective adhesive 30, and an ink layer 40. The display panel 20 includes a polarizer 201, a display substrate 202, and a support and heat dissipation assembly 203, arranged in that order. The polarizer 201 and the cover plate 10 are connected via an optical adhesive layer 50. The protective adhesive 30 is positioned between the cover plate 10 and the display panel and surrounds the edges of the polarizer 201, display substrate 202, and support and heat dissipation assembly 203. Both the protective adhesive 30 and the ink layer 40 contain epoxy groups, and a polyamino crosslinker forms a chemical crosslinking structure between the protective adhesive 30 and the ink layer 40.

[0035] The present invention does not impose any particular restrictions on the type of polarizer 201; any polarizer known in the art can be used in the present invention. In specific implementations, the polarizer 201 can be conventionally selected based on requirements. For example, it includes a wave plate layer, a linear polarization layer, and a protective layer, arranged in sequence. The wave plate layer is located on the side closest to the display substrate 202. Optionally, the wave plate layer of the polarizer 201 is connected to the display substrate 202 via an adhesive layer.

[0036] It should be noted that the present invention does not specifically limit the type of display substrate 202. Any display substrate in the prior art that has a display effect can be used in the present invention. In a specific implementation, the type of display substrate 202 can be conventionally selected and set according to display requirements. A typical example is an OLED display substrate.

[0037] The present invention does not specifically limit the type of the support heat dissipation component 203. The present invention is applicable to any support heat dissipation component in the prior art that has both support and heat dissipation effects. In specific implementations, the type of the support heat dissipation component 203 can be conventionally selected and set according to display requirements.

[0038] Optionally, the supporting heat dissipation assembly 203 includes a supporting film and a heat dissipation member, and the supporting film is located between the display substrate 202 and the heat dissipation member.

[0039] Optionally, the support film adopts BP support film, which can provide support and protection for the module.

[0040] Optionally, the BP support film includes a substrate and a pressure-sensitive adhesive layer. The substrate material includes, but is not limited to, PET and / or PI. The pressure-sensitive adhesive layer is positioned between the BP support film substrate and the display substrate to adhere the support film to the display substrate. The pressure-sensitive adhesive includes, but is not limited to, polyurethane pressure-sensitive adhesive and / or acrylate pressure-sensitive adhesive.

[0041] Optionally, the heat sink has the functions of supporting, buffering and dissipating heat, and its structure exemplarily includes an adhesive layer, a buffer layer, a support layer and a conductive layer arranged in sequence; wherein the adhesive layer is used to attach the heat sink to the support film; the buffer layer can be made of foam material, which can absorb stress and has buffering and protective effects; the support layer has a supporting effect, and the conductive layer is made of metal material, such as copper foil.

[0042] In some optional embodiments of the present invention, the protective adhesive 30 and the ink layer 40 contain epoxy groups, and the protective adhesive 30 contains a catalyst (e.g., a Lewis acid catalyst). Under the action of the catalyst, the amino groups in the polyamino crosslinker can undergo ring-opening reactions with the epoxy groups in the protective adhesive and the ink layer, respectively. The generated hydroxyl groups further react with the amino groups to form a crosslinked structure. An exemplary reaction scheme is as follows:

[0043]

[0044] Wherein, R represents a residue from a polyamino crosslinking agent, and E represents an epoxy resin residue from a protective glue or ink layer.

[0045] In some optional embodiments of the present invention, the number of amino groups in the polyamino cross-linking agent is 2-6, for example, 2, 3, 4, 5 or 6.

[0046] The number of amino groups in the polyamino crosslinking agent refers to the number of amino groups (in mol) per mol of the polyamino crosslinking agent. That is, based on 1 mol of the polyamino crosslinking agent, the number of amino groups is 2-6 mol, for example, 2 mol, 3 mol, 4 mol, 5 mol, or 6 mol. For example, ethylenediamine has 2 amino groups, while tetraethylenepentamine has 5 amino groups.

[0047] In some optional embodiments of the present invention, the polyamino crosslinking agent includes any one of aliphatic polyamines, alicyclic polyamines, and aromatic polyamines, or a combination of at least two of them.

[0048] Optionally, the aliphatic polyamine includes any one of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and dicyandiamide, or a combination of at least two thereof.

[0049] Optionally, the alicyclic polyamine includes any one or a combination of at least two of isophoronediamine, cyclohexanediamine, bis(4-aminocyclohexyl)methane, and bis(4-amino-3-methylcyclohexyl)methane.

[0050] Optionally, the aromatic polyamine includes any one of o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl ether, and 4,4'-diaminodiphenol, or a combination of at least two thereof.

[0051] In some optional embodiments of the present invention, the protective glue 30 adopts LIPO (low pressure injection molding) glue, which can improve the overall structural strength and stability of the module, and provide effective protection for the module, blocking external water and oxygen from entering the display module. At the same time, it is more conducive to achieving a narrow frame design, protecting the edge structure of the display module, and reducing the border of the entire machine.

[0052] In some optional embodiments of the present invention, the protective adhesive 30 includes epoxy resin adhesive.

[0053] In some optional embodiments of the present invention, the epoxy resin glue includes epoxy resin and also includes any one or a combination of at least two of a curing agent, an optional accelerator, and an optional catalyst.

[0054] Optionally, the epoxy resin in the epoxy resin glue includes an epoxy resin containing aromatic groups, and its main chain contains aromatic groups such as benzene rings, so it has strong rigidity; at the same time, the main chain of the epoxy resin molecule contains at least 2 epoxy groups, which can provide rich and highly active reaction sites.

[0055] In some optional embodiments of the present invention, the epoxy resin glue includes any one of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, and biphenyl epoxy resin, or a combination of at least two of them.

[0056] Optionally, the curing agent in the epoxy resin adhesive is an epoxy curing agent known in the art, including, but not limited to, any one or a combination of at least two of phenolic resin, amine curing agent, anhydride curing agent, and thiol curing agent. The curing agent is used in an amount such that the epoxy resin can be partially or fully cured.

[0057] In some optional embodiments of the present invention, the ink layer 40 includes epoxy resin-based ink.

[0058] In some optional embodiments of the present invention, the epoxy resin-based ink includes any one or a combination of at least two of epoxy resin, epoxy curing agent, optionally accelerator, optionally catalyst, optionally colorant, and optionally other auxiliary agents.

[0059] In some optional embodiments of the present invention, the epoxy resin in the epoxy resin-based ink includes any one of novolac epoxy resin, bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, biphenyl epoxy resin, and aliphatic epoxy resin, or a combination of at least two thereof.

[0060] In some optional embodiments of the present invention, the epoxy curing agent in the epoxy resin-based ink is of a type known in the art, illustratively including but not limited to: any one or a combination of at least two of phenolic resins, amine curing agents, acid anhydride curing agents, and thiol curing agents. The epoxy curing agent is used in an amount such that the epoxy resin can be partially or fully cured.

[0061] Optionally, the other additives include any one or a combination of at least two of a dispersant, a flame retardant, a filler, a matting agent, a thixotropic agent, a defoaming agent, and a leveling agent.

[0062] An embodiment of the present invention further provides a method for preparing the display module described in the aforementioned embodiment, the method comprising the following steps:

[0063] Providing a modified ink comprising a combination of an ink containing epoxy groups and a polyamino crosslinking agent;

[0064] Applying the modified ink on the surface of the cover plate to obtain a cover plate with an ink layer;

[0065] After the cover plate with the ink layer is assembled with the display panel, the protective glue containing epoxy groups is molded by an injection molding process to obtain the display module.

[0066] like Figure 3 As shown, Figure 3 A schematic flow chart of a method for preparing a display module according to one embodiment of the present invention specifically includes:

[0067] Step 1: providing a modified ink, wherein the modified ink comprises a combination of an ink containing an epoxy group and a polyamino crosslinking agent;

[0068] Step 2: applying the modified ink on the surface of the cover plate 10 to obtain the cover plate 10 with a modified ink layer;

[0069] Step 3: After assembling the cover plate 10 with the modified ink layer and the display panel 20 , a protective adhesive containing an epoxy group is molded by an injection molding process to obtain the display module.

[0070] In one embodiment of the present invention, a polyamino crosslinker and an epoxy-containing ink are first mixed in a specific ratio to form a modified ink. The modified ink is then applied to the target location on a cover plate. After a period of time, the polyamino crosslinker migrates to the ink surface and solidifies. The cover plate with the modified ink layer is then assembled with a display panel, and a protective sealant containing epoxy groups is injection molded to form a display module. Because the polyamino crosslinker migrates to the ink surface, it undergoes a ring-opening reaction with the epoxy groups in the protective sealant and ink, respectively, forming a chemical crosslinking network between the protective sealant and ink layers. This improves interlayer adhesion, resolves the peeling problem, and significantly enhances the reliability of the display module and the display device incorporating it, improving yield and display quality.

[0071] In some optional embodiments of the present invention, the mass percentage of the polyamino crosslinker in the modified ink is 0.01%-20%, for example, it can be 0.02%, 0.05%, 0.08%, 0.1%, 0.3%, 0.5%, 0.8%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18% or 19%, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range.

[0072] In some optional embodiments of the present invention, the thickness of the modified ink layer is 1-15 μm, for example, it can be 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm or 14 μm, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range.

[0073] In some optional embodiments of the present invention, the epoxy-containing protective adhesive is a LIPO (Low Pressure Injection Molding) adhesive. The LIPO injection molding process provides effective protection for the module while also facilitating a narrow bezel design and reducing the overall device border. The present invention does not specifically limit the specific methods and steps of the injection molding process; all known injection molding processes are applicable to the present invention.

[0074] An embodiment of the present invention further provides another method for preparing the display module described in the aforementioned embodiment, the method comprising:

[0075] providing a cover plate with an ink layer;

[0076] coating the polyamino crosslinking agent on the ink layer to form a crosslinking agent layer, thereby obtaining a cover plate with a composite layer;

[0077] After assembling the cover plate with the composite layer and the display panel, the protective glue containing epoxy groups is molded by an injection molding process to obtain the display module.

[0078] like Figure 4 As shown, Figure 4 A schematic flow chart of a method for preparing a display module according to another embodiment of the present invention specifically includes:

[0079] Step S1: providing a cover plate 10 with an ink layer 40;

[0080] Step S2: coating the polyamino crosslinking agent on the ink layer 40 to form a crosslinking agent layer, thereby obtaining a cover plate with a composite layer;

[0081] Step S3: After assembling the cover plate with the composite layer and the display panel 20 , a protective adhesive containing an epoxy group is molded by an injection molding process to obtain the display module.

[0082] In another embodiment of the present invention, an ink layer 40 is first formed on a cover plate 10. A polyamino crosslinker is then applied to the ink layer 40 to form a crosslinker layer. The cover plate with the crosslinker and ink layers is then assembled with a display panel, and a protective adhesive containing epoxy groups is injection molded to form a display module. The polyamino groups in the crosslinker layer undergo ring-opening reactions with the epoxy groups in the protective adhesive and ink, respectively, forming a stable chemically crosslinked network structure between the protective adhesive and ink layers. This improves interlayer adhesion, resolves the peeling problem that can occur between layers, and significantly enhances the reliability of the display module and the display device incorporating it, optimizing yield and display quality.

[0083] In some optional embodiments of the present invention, the thickness of the ink layer is 1-15 μm, for example, it can be 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm or 14 μm, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0084] In another embodiment of the present invention, the polyamino crosslinking agent is mixed with an alcohol solvent to obtain a coating solution; and the coating solution is coated on the ink layer to form a crosslinking agent layer.

[0085] Optionally, the alcohol solvent includes C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) monohydric alcohol and / or C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) polyhydric alcohol; illustratively including but not limited to: any one of methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, tert-butanol, pentanol, hexanol, ethylene glycol, propylene glycol, glycerol, and butanediol, or a combination of at least two thereof.

[0086] The ratio of the polyamino crosslinking agent to the alcohol solvent is not particularly limited, as long as it can dilute the polyamino crosslinking agent and make the formed coating solution have a suitable coating viscosity.

[0087] Optionally, the coating method includes spin coating and / or spray coating.

[0088] In some optional embodiments of the present invention, the thickness of the crosslinker layer is 0.01-10 μm, for example, it can be 0.02 μm, 0.05 μm, 0.08 μm, 0.1 μm, 0.3 μm, 0.5 μm, 0.8 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm or 9 μm, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0089] In some optional embodiments of the present invention, the epoxy-containing protective adhesive is a LIPO (Low Pressure Injection Molding) adhesive. The LIPO injection molding process provides effective protection for the module while also facilitating a narrow bezel design and reducing the overall device border. The present invention does not specifically limit the specific methods and steps of the injection molding process; all known injection molding processes are applicable to the present invention.

[0090] In some optional embodiments, the present invention evaluates the technical effects of the display modules provided in the aforementioned embodiments and the display modules prepared by the aforementioned preparation methods, and tests the reliability of the display modules, including performing TST tests, double 85 tests, and HAST tests. The test results show that a stable and reliable bonding effect is formed between the protective glue and the ink layer in the display module, and the display module has significantly improved reliability. After the reliability test, the layers are still stably bonded, there is no whitening phenomenon in the glue layer, and the glue layer will not peel off or fall off, thereby solving the peeling problem caused by the weak adhesion between the LIPO glue and the ink, and improving the reliability and yield of the display module and the display device.

[0091] Based on the above embodiments, another embodiment of the present invention further provides a display device, which includes at least one of the display modules provided in any of the above embodiments and the display modules prepared by the preparation method described in any of the above embodiments.

[0092] Since the display device adopts the above display module, the display device also has the technical effects of the display module described in the above embodiment. It should be noted that the display device provided by the embodiment of the present invention may also include other circuits and devices for supporting the normal operation of the display device.

[0093] Based on the above embodiments, another embodiment of the present invention provides an electronic device, which includes at least one of the display module provided in any of the above embodiments, the display module prepared by the preparation method described in any of the above embodiments, and the display device provided in any of the above embodiments.

[0094] In some optional embodiments of the present invention, the electronic device illustratively includes but is not limited to: mobile phones, computers, electronic photo frames, electronic paper, smart wearable devices and other devices with display functions.

[0095] The applicant declares that while the present invention uses the above-described embodiments to illustrate the display module, its preparation method, and display device, the present invention is not limited to the above-described process steps, nor does it imply that the present invention must rely on the above-described process steps for implementation. Persons skilled in the art should understand that any improvements to the present invention, equivalent substitutions for the raw materials used, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A display module, characterized in that: The display module comprises: Cover plate; Display panel; A protective adhesive, located between the cover plate and the display panel; An ink layer, which is located between the protective glue and the cover plate; The protective glue and the ink layer contain epoxy groups, and a chemical cross-linking structure is formed between the protective glue and the ink layer through a polyamino cross-linking agent.

2. The display module according to claim 1, characterized in that: The number of amino groups in the polyamino crosslinking agent is 2-6.

3. The display module according to claim 1, characterized in that: The polyamino crosslinking agent includes any one of aliphatic polyamines, alicyclic polyamines, and aromatic polyamines, or a combination of at least two of them.

4. The display module according to claim 1, characterized in that: The protective glue comprises epoxy resin glue.

5. The display module according to claim 4, characterized in that: The epoxy resin glue includes any one of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, and biphenyl epoxy resin, or a combination of at least two of them.

6. The display module according to claim 1, characterized in that: The ink layer includes epoxy-based ink.

7. The display module according to claim 6, characterized in that: The epoxy resin in the epoxy resin-based ink includes any one of phenolic epoxy resin, bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, biphenyl epoxy resin, and aliphatic epoxy resin, or a combination of at least two of them.

8. The display module according to claim 1, characterized in that: The display panel comprises a polarizer, a display substrate and a support heat dissipation assembly which are arranged in sequence, and the polarizer is connected to the cover plate via an optical adhesive layer; The protective glue is located between the cover plate and the display panel, and is arranged around the edges of the polarizer, the display substrate and the supporting heat dissipation assembly.

9. A method for preparing a display module according to any one of claims 1 to 8, characterized in that: The preparation method comprises: Providing a modified ink, the modified ink comprising a combination of an ink containing an epoxy group and a polyamine crosslinking agent; Applying the modified ink on the surface of the cover plate to obtain a cover plate with a modified ink layer; After the cover plate with the modified ink layer is assembled with the display panel, the protective glue containing epoxy groups is molded by injection molding to obtain the display module.

10. The preparation method according to claim 9, characterized in that: The mass percentage of the polyamino cross-linking agent in the modified ink is 0.01%-20%.

11. A method for preparing a display module according to any one of claims 1 to 8, characterized in that: The preparation method comprises: providing a cover plate with an ink layer; The polyamino cross-linking agent is coated on the ink layer to form a cross-linking agent layer, thereby obtaining a cover plate with a composite layer; After the cover plate with the composite layer is assembled with the display panel, the protective glue containing epoxy groups is molded by injection molding to obtain the display module.

12. The preparation method according to claim 11, characterized in that: The thickness of the crosslinking agent layer is 0.01-10 μm.

13. A display device, characterized in that: The display device comprises at least one of the display module according to any one of claims 1 to 8 and the display module prepared by the preparation method according to any one of claims 9 to 12.

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