Display module, preparation method thereof and display device

Abstract

The application provides a display module, a preparation method thereof and a display device. The display module comprises a display panel, a cover plate and an optical adhesive layer arranged between the display panel and the cover plate. The optical adhesive layer comprises a bending optical adhesive area, which is obtained by embedding microcapsules in a base adhesive. The microcapsules comprise a capsule wall and an inner core coated in the capsule wall. The material of the inner core is a first adhesive, and the viscosity of the first adhesive is greater than the viscosity of the base adhesive. In the bending process, the microcapsules are broken under stress, and the first adhesive with high viscosity in the inner core is released into the base adhesive to form a supplementary adhesive. The thickness of the bending optical adhesive area is increased, and the bonding force is enhanced. Thus, the peeling problem of the adhesive material at the bending part of the curved screen under the action of shearing force is solved, the reliability and display yield of the display module and the display device comprising the same are significantly improved, and the display effect is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of display, and particularly relates to a display module, a preparation method thereof and a display device. BACKGROUND

[0002] In order to meet increasingly diverse display requirements, display devices with different properties and functions have emerged, bringing great convenience to people's daily life and work. Portability, intelligence and flexibility are the main development directions of current display devices. Flexible display devices break the traditional two-dimensional display concept, and people can bend them according to needs, reduce device size, improve screen ratio and improve user visual experience. Compared with conventional display devices, flexible display devices are more lightweight, can reduce power consumption, and based on the bendable characteristics, high-resolution and different-size display targets can be realized. In recent years, flexible display devices have gradually become mainstream products in the display field.

[0003] With the development of flexible display devices, new requirements have been put forward for the performance of curved screens. However, the adhesive material at the bending part of the curved screen is prone to wrinkling or peeling under the action of shear force, i.e., peeling problem occurs, which further causes display signal transmission failure and leads to display defects. Therefore, solving the peeling problem of the curved screen and providing a display device with better display effect are the research focus in the field. SUMMARY

[0004] In order to solve the peeling problem of the curved screen and provide a display device with better display effect, one of the purposes of the present application is to provide a display module, which comprises a display panel, a cover plate and an optical adhesive layer arranged between the display panel and the cover plate; the optical adhesive layer comprises a bending optical adhesive area, which is obtained by embedding microcapsules in a base adhesive; the microcapsules comprise a capsule wall and an inner core coated in the capsule wall, and the material of the inner core is a first adhesive with a viscosity > the viscosity of the base adhesive.

[0005] In the display module provided by the present application, the display panel and the cover plate are connected by the optical adhesive layer, wherein the bending optical adhesive area in the optical adhesive layer is obtained by embedding microcapsules in the base adhesive. In the bending process, the microcapsules are broken under stress, and the first adhesive with high viscosity in the inner core is released into the base adhesive to form a supplementary adhesive, so that the thickness of the bending optical adhesive area is appropriately increased, and the adhesion is enhanced, thereby solving the problem that the adhesive material at the bending part of the curved screen is wrinkled or peeled off under the action of shear force, i.e., solving the peeling problem, thereby significantly improving the reliability and display yield of the display module and the display device containing the same, and improving the display effect.

[0006] The second object of the present application is to provide a preparation method of the display module according to the first object, comprising:

[0007] The display panel and the cover plate are bonded by optical glue to obtain a first pre-prepared display module; the optical glue comprises a bendable area, and the bendable area comprises a base glue and microcapsules arranged in the base glue;

[0008] The first pre-prepared display module is bent to obtain a second pre-prepared display module; the microcapsules are broken during the bending process, and the first glue is released in the base glue;

[0009] The second pre-prepared display module is cured to obtain the display module.

[0010] The third object of the present application is to provide a display device comprising the display module according to any one of the first object.

[0011] Compared with the prior art, the present application has the following beneficial effects:

[0012] The display module provided by the present application, the bendable optical glue area of the optical glue layer is obtained by arranging microcapsules in the base glue, and during the bending process, the microcapsules are broken under stress, and the first glue with high viscosity in the core is released in the base glue, forming a supplementary glue, increasing the thickness of the bendable optical glue area and enhancing the bonding force, thereby solving the problem of wrinkles or peeling of the glue material at the bending part of the curved screen under the action of shear force, significantly improving the reliability and display yield of the display module and the display device comprising the same, and improving the display effect. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The structure diagram of the display module provided by an embodiment of the present application is shown;

[0014] Figure 2 The structure diagram of the bendable optical glue area provided by an embodiment of the present application is shown;

[0015] Figure 3 The structure diagram of the microcapsule provided by an embodiment of the present application is shown;

[0016] Figure 4 The structure diagram of the microcapsule provided by an embodiment of the present application is shown;

[0017] Figure 5 The equivalent stress-glue layer thickness relationship diagram provided by an embodiment of the present application is shown;

[0018] Figure 6 The RGB three-pixel relative transmittance-glue layer thickness relationship diagram provided by an embodiment of the present application is shown;

[0019] Figure 7 A flowchart of a preparation method of a display module provided for an embodiment of the present application is shown in FIG. 1.

[0020] Figure 8 A structural diagram of a display device provided for an embodiment of the present application is shown in FIG. 2.

[0021] In the figure, 10 is a display panel, 20 is an optical adhesive layer, 21 is a bending optical adhesive area, 210 is a base adhesive, 211 is a microcapsule, 22 is a non-bending optical adhesive area, 30 is a cover plate, and 40 is a display module. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only used to help understand the present application and should not be regarded as specific limitations on the present application.

[0023] In the present application, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features, which are used to distinguish the features and have no order or importance. In the description of the present application, unless otherwise specified, "a plurality of" means two or more.

[0024] In the present application, the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does 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 cannot be understood as a limitation on the present application.

[0025] In the present application, unless otherwise specified and limited, the terms "connected", "connected", "mounted", "fixed", etc. should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the above terms in the present application can be understood according to the specific meaning.

[0026] The present application has found that, in the process of bending the traditional curved display module and curved screen, the adhesive material at the bending position is prone to wrinkling or separation under the action of shearing force, i.e. peeling problem occurs, which further causes display signal transmission failure, resulting in display failure, affecting the reliability and yield of the product.

[0027] To solve the above technical problems, an embodiment of the present application provides a display module, a display panel and a cover plate are connected through an optical adhesive layer, a bending optical adhesive area of the optical adhesive layer is obtained by embedding microcapsules in a base adhesive, in the bending process, the microcapsules are broken under stress, the first adhesive with high viscosity in the core of the microcapsules is released in the base adhesive to form a supplementary adhesive, the thickness of the bending optical adhesive area is appropriately increased, and the bonding force is enhanced, thereby solving the problem of wrinkles or peeling of the adhesive material at the bending part of the curved screen under the action of shearing force, significantly improving the reliability and display yield of the display module and the display device comprising the same, and optimizing the display effect.

[0028] In order to make the above-mentioned purposes, features and effects of the present application more obvious, the present application is further described in detail below in combination with the drawings and specific embodiments.

[0029] Figure 1 A structural schematic diagram of a display module provided by an embodiment of the present application is shown in FIG. 1. Figure 1 As shown in FIG. 1, the display module comprises a display panel 10, a cover plate 30, and an optical adhesive layer 20 arranged between the display panel 10 and the cover plate 30; the optical adhesive layer comprises a bending optical adhesive area 21; the bending optical adhesive area 21 is obtained by embedding microcapsules in a base adhesive; the microcapsules comprise a capsule wall and a core wrapped in the capsule wall, the material of the core is a first adhesive, and the viscosity of the first adhesive > the viscosity of the base adhesive.

[0030] It should be noted that the optical adhesive layer 20 further comprises a non-bending optical adhesive area 22, which is arranged adjacent to the bending optical adhesive area 21. Correspondingly, the display module is a curved display module, which comprises a bending area and a non-bending area, and the bending optical adhesive area 21 is located in the bending area of the display module.

[0031] In the display module, the optical adhesive layer 20 is arranged between the display panel 10 and the cover plate 30, and the fixing and bonding effect between the display panel 10 and the cover plate 30 is realized through the optical adhesive layer 20. The bending optical adhesive area 21 in the optical adhesive layer 20 is obtained by embedding microcapsules in a base adhesive, the core of the microcapsules is a first adhesive, the viscosity of the first adhesive > the viscosity of the base adhesive; in the bending process, the microcapsules are broken under stress, the first adhesive with high viscosity in the core of the microcapsules is released in the base adhesive to form a supplementary adhesive, the viscosity of the bending optical adhesive area 21 is increased, the thickness is appropriately increased, and the adhesive has higher cohesion and effectively enhanced bonding force, thereby avoiding wrinkles or peeling of the adhesive material at the bending part under the action of bending shearing force, solving the peeling problem and the display defect problem caused thereby, making the display module have higher product yield and reliability, and realizing improvement of the display effect.

[0032] It should be noted that the present invention does not impose any special limitation on the type of display panel 10, and any existing display panel with display effect can be used in the present invention. In specific implementations, the type of display panel 10 can be conventionally selected and set according to display requirements.

[0033] For example, the display panel 10 includes a display substrate and a polarizer, the polarizer being located on the side close to the cover plate 30, that is, the optical adhesive layer 20 is disposed on the side of the polarizer.

[0034] It should be noted that the present invention does not impose any special limitations on the cover plate 30. For example, it can be a material with good light transmittance, such as glass or plastic. The plastic, exemplary, includes, but is not limited to, any one or a combination of at least two of polyethylene terephthalate (PET), polyimide (PI), polycarbonate (PC), and polymethyl methacrylate (PMMA). In specific implementations, the thickness of the cover plate 30 can be selected according to requirements. Furthermore, the surface of the cover plate 30 can be flat, or one or two surfaces can be set with a certain curvature as needed.

[0035] The optical adhesive layer 20, specifically the optical adhesive (Optically Clear Adhesive, OCA) located in the non-bending optical adhesive region 22, features high transparency, good bonding strength, good weather resistance and heat resistance, room temperature curing capability, and low curing yield. This invention does not specifically limit the type of optical adhesive in the non-bending optical adhesive region 22. Based on the composition of the optical adhesive, it includes any one or a combination of at least two of the following: unsaturated polyester optical adhesives, epoxy optical adhesives, polyurethane optical adhesives, silicone optical adhesives, and acrylate optical adhesives. Based on the curing method of the optical adhesive, it includes: thermosetting and photocuring.

[0036] Optionally, the optical adhesive in the non-bending optical adhesive region 22 includes a photocurable optical adhesive, which cures under ultraviolet or visible light irradiation to achieve stable and reliable bonding; the photocurable optical adhesive has a short curing time and forms an optical adhesive layer with good mechanical properties, stability and weather resistance.

[0037] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a bent optical adhesive region provided in one embodiment of the present invention. The bent optical adhesive region is obtained by embedding microcapsules 211 in a matrix adhesive 210. Figure 2 The structure shown is the structure before bending.

[0038] It should be noted that in the bending optical adhesive area, the number of microcapsules 211 embedded in the base adhesive 210 is at least 1, for example, can be 3, 5, 8, 10, 12, 15, 18, 20, 22, 25, 28, 30, 33, 35 or 38, and specific point values between the above point values, limited to the length and for the sake of simplicity, the present application will not be exhausted to enumerate the specific point values included in the range.

[0039] In some optional embodiments of the present application, the number of microcapsules embedded in the base adhesive is 5-30.

[0040] In the display module of the present application, the bending optical adhesive area is obtained by embedding microcapsules in the base adhesive. Before bending, the microcapsules are distributed in the base adhesive. During the bending process, the microcapsules are broken due to the shear force in the bending process, the first adhesive with high viscosity inside the microcapsules is released in the base adhesive, forming a supplementary adhesive, increasing the viscosity and thickness of the stress area, thereby having higher cohesive force and bonding force, solving the peeling problem. By controlling the number of microcapsules embedded in the base adhesive to be 5-30, on the one hand, the thickness of the bending optical adhesive area is moderately increased, the bonding force is stronger, and the bending stress of the bending area can be relieved, avoiding the display defects caused by peeling or falling off of the adhesive layer at the bending area; on the other hand, the appropriate number of microcapsules can make the adhesive layer have appropriate thickness and good light transmittance, ensuring excellent display effect. If the number of microcapsules is too small, it is not enough to improve the cohesive force and bonding force of the bending area, resulting in that the peeling problem and display defect problem are not completely solved; if the number of microcapsules is too large, the thickness of the bending optical adhesive area will be too high, causing the problem of decreased light transmittance.

[0041] In some optional embodiments of the present application, the volume of the microcapsule is 1-10mm 3 , for example, can be 2mm 3 , 3mm 3 , 4mm 3 , 5mm 3 , 6mm 3 , 7mm 3 , 8mm 3 or 9mm 3 , and specific point values between the above point values, limited to the length and for the sake of simplicity, the present application will not be exhausted to enumerate the specific point values included in the range.

[0042] It should be noted that the aforementioned volume is the volume of a single microcapsule; the volumes of the plurality of microcapsules 211 embedded in the base adhesive 210 are the same or different, each independently being 1-10mm 3 .

[0043] In some alternative embodiments of the present invention, the microcapsule 211 may be spherical, ellipsoidal, or gyroscope-shaped.

[0044] like Figure 3 As shown, in some optional embodiments of the present invention, the microcapsules 211 are gyroscope-shaped. Before bending, the microcapsules are distributed in the matrix gel, with certain gaps between each microcapsule. During bending, the gel and the microcapsules 211 come into contact and are squeezed together, thus rupturing. A schematic diagram of the rupture is shown below. Figure 4 As shown, the locations indicated by 211A and 211B are exemplary fracture locations.

[0045] In some optional embodiments of the present invention, the volume of the bent optical adhesive region is V1, the total volume of the microcapsule is V2, and V1:V2 = 1:(0.3-0.7). For example, V1:V2 can be 1:0.35, 1:0.4, 1:0.45, 1:0.5, 1:0.55, 1:0.6, or 1:0.65, etc.

[0046] In the display module of this invention, the volume of the bending optical adhesive area is V1, and the total volume of the microcapsules embedded in the matrix adhesive is V2. V2 is the sum of the volumes of the microcapsules embedded in the matrix adhesive, and is related to the volume of a single microcapsule and the number of microcapsules embedded in the matrix adhesive. By controlling V1:V2 = 1:(0.3-0.7), the volume of the first adhesive that can be released during bending is controlled, resulting in higher cohesion and adhesion at the bending stress point, while maintaining high light transmittance. This avoids display defects and provides the display module and display device with better display performance. If V2 is too small, less first adhesive is released, resulting in insufficient thickening of the adhesive layer at the bending stress point and inadequate adhesion, leaving the display module at risk of adhesive layer peeling or detachment. If V2 is too large, more first adhesive is released, causing excessive thickening of the adhesive layer at the bending stress point, leading to reduced light transmittance and affecting the display performance.

[0047] In some optional embodiments of the present invention, the thickness of the bent optical adhesive area is 0.05-0.4 mm, for example, it can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm or 0.35 mm, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific point values ​​included in the range.

[0048] The display module of the present application, the bonding machine of the bending optical glue area is explained as follows: the base glue is deformed and the thickness is thinned under the influence of external force in bending; at the same time, the microcapsules are crushed and broken in bending, so that the first glue inside is released to form a supplementary glue, so that the thickness of the stress position is appropriately increased, and the bonding property is increased. The present application studies the relationship between the maximum equivalent stress at the bonding interface and the thickness of the glue layer by the method of equivalent stress distribution cloud diagram, and the equivalent stress-glue layer thickness relationship diagram obtained is as shown in Figure 5 At the same time, the relationship between the transmittance and the thickness of the glue layer is studied, and the RGB three-pixel relative transmittance-glue layer thickness relationship diagram obtained is as shown in Figure 6 Combining Figure 5 and Figure 6 It can be seen that, considering the equivalent stress and light transmittance of the glue layer, the thickness of the bending optical glue area is preferably 0.1-0.3mm, for example, it can be 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm or 0.28mm, etc.

[0049] In some optional embodiments of the present application, the first glue includes a combination of a first base resin and a first active diluent; the base glue includes a combination of a second base resin and a second active diluent; the first active diluent and the second active diluent each independently include a combination of a bifunctional monomer and a monofunctional monomer; the mass concentration of the bifunctional monomer in the first active diluent > the mass concentration of the bifunctional monomer in the second active diluent.

[0050] In some optional embodiments of the present application, the first glue includes a combination of a first base resin and a first active diluent, the base glue includes a combination of a second base resin and a second active diluent, and the first active diluent and the second active diluent each independently include a combination of a bifunctional monomer and a monofunctional monomer; thereby, the first glue and the base glue have the same type of material composition, the difference is that the mass concentration of the bifunctional monomer is different, the mass concentration of the bifunctional monomer in the first active diluent > the mass concentration of the bifunctional monomer in the second active diluent, thereby, the viscosity of the first glue > the viscosity of the base glue. In the bending process, the microcapsules are broken to release the first glue, the first glue with high viscosity and the base glue form a mixed glue, promote the entanglement and connection of the long molecular chains in the glue, appropriately increase the thickness of the stress position, enhance the cohesion and bonding force, and make the bending area form a stable bonding with high strength.

[0051] In some alternative embodiments of the present application, the mass ratio of the difunctional monomer and the monofunctional monomer in the first reactive diluent is (3-7): 1, which can be 3.2: 1, 3.5: 1, 3.8: 1, 4: 1, 4.2: 1, 4.5: 1, 4.8: 1, 5: 1, 5.2: 1, 5.5: 1, 5.8: 1, 6: 1, 6.2: 1, 6.5: 1, or 6.8: 1, etc.

[0052] In some alternative embodiments of the present application, the mass ratio of the difunctional monomer and the monofunctional monomer in the second reactive diluent is (1-3): 1, which can be 1.2: 1, 1.5: 1, 1.8: 1, 2: 1, 2.2: 1, 2.5: 1, 2.8: 1, etc.

[0053] In some alternative embodiments of the present application, the first host resin and the second host resin each independently comprises a polyacrylate.

[0054] Optionally, the polyacrylate comprises any one or a combination of at least two of trimethylcyclohexyl acrylate, trimethylcyclohexyl methacrylate, alkyl acrylate homopolymer, alkyl acrylate copolymer, alkyl methacrylate homopolymer, alkyl methacrylate copolymer, alkyl acrylate-alkyl methacrylate copolymer, and further preferably trimethylcyclohexyl acrylate.

[0055] In some alternative embodiments of the present application, the difunctional monomer comprises tripropylene glycol diacrylate (TPGDA).

[0056] In some alternative embodiments of the present application, the monofunctional monomer comprises isobornyl acrylate (IBOA).

[0057] In some alternative embodiments of the present application, the first colloid further comprises a first photoinitiator and optionally other auxiliaries, and the matrix glue further comprises a second photoinitiator and optionally other auxiliaries.

[0058] Optionally, the first photoinitiator and the second photoinitiator each independently comprises any one or a combination of at least two of 1-hydroxycyclohexyl phenyl ketone (photoinitiator 184), diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (photoinitiator TPO), 2-hydroxy-2-methyl-1-phenyl-1-propanone (photoinitiator 1173), and phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide (photoinitiator 819).

[0059] In some optional embodiments of the present application, the first gel comprises the following components by mass parts: 20-60 parts of the first main resin, 20-40 parts of the first active diluent, and 0.1-5 parts of the first photoinitiator; the first active diluent comprises a combination of a bifunctional monomer and a monofunctional monomer, and the mass ratio of the bifunctional monomer to the monofunctional monomer is (3-7):1.

[0060] Optionally, in the first gel, the mass parts of the first main resin is 20-60 parts, for example, it can be 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, or 55 parts, and specific point values between the above point values, limited by the length and for the sake of simplicity, the present application will not exhaustively list the specific point values included in the range.

[0061] In the first gel, the mass parts of the first active diluent is 20-40 parts, for example, it can be 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, or 38 parts, and specific point values between the above point values, limited by the length and for the sake of simplicity, the present application will not exhaustively list the specific point values included in the range.

[0062] In the first gel, the mass parts of the first photoinitiator is 0.1-5 parts, for example, it can be 0.2 parts, 0.5 parts, 0.8 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, or 4.5 parts, and specific point values between the above point values, limited by the length and for the sake of simplicity, the present application will not exhaustively list the specific point values included in the range.

[0063] In some optional embodiments of the present application, the base gel comprises the following components by mass parts: 20-60 parts of the second main resin, 20-40 parts of the second active diluent, and 0.1-5 parts of the second photoinitiator; the second active diluent comprises a combination of a bifunctional monomer and a monofunctional monomer, and the mass ratio of the bifunctional monomer to the monofunctional monomer is (1-3):1.

[0064] Optionally, in the base gel, the mass parts of the second main resin is 20-60 parts, for example, it can be 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, or 55 parts, and specific point values between the above point values, limited by the length and for the sake of simplicity, the present application will not exhaustively list the specific point values included in the range.

[0065] In the base gel, the mass parts of the second active diluent is 20-40 parts, for example, it can be 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, or 38 parts, and specific point values between the above point values, limited by the length and for the sake of simplicity, the present application will not exhaustively list the specific point values included in the range.

[0066] The mass fraction of the second photoinitiator in the base adhesive is 0.1-5 parts, for example, can be 0.2 parts, 0.5 parts, 0.8 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, and specific point values between the above point values, limited to the length and for the sake of simplicity, the present application does not enumerate the specific point values included in the range.

[0067] In some optional embodiments of the present application, the material of the capsule wall is an epoxy resin composition; the capsule wall has a supporting effect, the microcapsules are pressed against each other in bending, the capsule wall is broken, the first colloid in the interior is released, the capsule wall can still maintain a certain "stiffness" state in the base adhesive; the first colloid is mixed with the base adhesive to form a supplementary colloid, the colloid viscosity at the bonding interface is increased, the interface has stronger cohesive force, the bonding force of the interface is improved, the bending optical adhesive area formed thereby has stable and reliable bonding performance, can relieve bending stress, and improve the yield and reliability of the display module.

[0068] Optionally, the epoxy resin composition comprises an epoxy resin, and any one or a combination of at least two of a curing agent, a crosslinking agent and an accelerator.

[0069] Optionally, the type of the epoxy resin is not particularly limited, and exemplarily includes but is not limited to any one or a combination of at least two of a bisphenol A epoxy resin, a bisphenol F epoxy resin, a phenolic epoxy resin, a biphenyl epoxy resin and an alicyclic epoxy resin.

[0070] Optionally, the curing agent is an epoxy resin curing agent known in the art, and exemplarily includes but is not limited to any one or a combination of at least two of a phenolic resin, an amine curing agent and an acid anhydride curing agent. The amount of the curing agent is such that the epoxy resin can be partially or completely cured.

[0071] In some optional embodiments of the present application, the microcapsule comprises a capsule wall and an inner core coated in the capsule wall, the material of the capsule wall is an epoxy resin composition, the material of the inner core is a first colloid, and the first colloid comprises a first main body resin, a first active diluent, optionally a first photoinitiator and optionally other auxiliaries. The preparation method of the microcapsule is not particularly limited, for example, can be prepared by a single coacervation method or a complex coacervation method known in the art.

[0072] The present application also provides a preparation method of the display module in the foregoing embodiments, and the preparation method comprises:

[0073] The display panel and the cover plate are bonded by the optical adhesive to obtain a first prefabricated display module; the optical adhesive comprises a bendable area, and the bendable area comprises a base adhesive and microcapsules arranged in the base adhesive.

[0074] bending the first pre-preparation display module to obtain a second pre-preparation display module; the microcapsules are broken in the bending process to release the first colloid in the base glue;

[0075] curing the second pre-preparation display module to obtain the display module.

[0076] As shown in Figure 7 , Figure 7 a flowchart of a preparation method of a display module provided by an embodiment of the present application, which specifically comprises:

[0077] Step 1: providing a display panel 10 and a cover plate 30 respectively;

[0078] Step 2: bonding the display panel 10 and the cover plate 30 by optical glue to obtain a first pre-preparation display module; the first pre-preparation display module comprises a non-bending area and a bendable area, and correspondingly, the optical glue also comprises a non-bending area and a bendable area, the bendable area of the optical glue comprising a base glue and microcapsules placed in the base glue;

[0079] Step 3: bending the first pre-preparation display module to obtain a second pre-preparation display module; the microcapsules are broken in the bending process to release the first colloid in the base glue;

[0080] Step 4: curing the second pre-preparation display module to obtain the display module.

[0081] In some optional embodiments of the present application, the microcapsules are placed in the base glue of the bendable area by the method of injection. Alternatively, the injection is implemented by a high-pressure device and a microprobe, and the microcapsules are placed in the base glue by pressure.

[0082] In some optional embodiments of the present application, the curing method comprises irradiation curing, preferably ultraviolet irradiation curing (UV curing), and optionally using a UV process known in the art.

[0083] The present application also provides a display device, Figure 8 a structural diagram of a display device provided by an embodiment of the present application, which comprises any one of the display modules 40 provided by the embodiments of the present application.

[0084] Since the display device adopts the above-mentioned display module 40, the display device also has the technical effects of the display module described in the above embodiments. It should be noted that the display device provided by the embodiments of the present application can also include other circuits and devices for supporting the normal operation of the display device. The display device exemplarily comprises but is not limited to any one of the following: a mobile phone, a tablet computer, an electronic photo frame, and an electronic paper.

[0085] The applicant states that the display module and the preparation method thereof and the display device of the present application are illustrated by the above-mentioned embodiments, but the present application is not limited to the above-mentioned process steps, that is, it does not mean that the present application must rely on the above-mentioned process steps to be implemented. The skilled in the art should understand that any improvement of the present application, equivalent replacement of the raw materials selected by the present application, addition of auxiliary ingredients, selection of specific modes, etc. fall within the protection scope and disclosure scope of the present application.

Claims

1. A display module, characterized in that, The display module includes a display panel, a cover plate, and an optical adhesive layer disposed between the display panel and the cover plate; The optical adhesive layer includes a bent optical adhesive region, which is obtained by embedding microcapsules in the matrix adhesive; The microcapsule includes a capsule wall and an inner core encapsulated in the capsule wall. The material of the inner core is a first colloid, and the viscosity of the first colloid is greater than the viscosity of the matrix colloid. The first colloid comprises a combination of a first host resin and a first reactive diluent, and the matrix colloid comprises a combination of a second host resin and a second reactive diluent, wherein the first reactive diluent and the second reactive diluent each independently comprise a combination of a bifunctional monomer and a monofunctional monomer, and the first colloid and the matrix colloid have the same type of material composition. The first and second main resins each independently comprise polyacrylate.

2. The display module according to claim 1, characterized in that, The microcapsules have a volume of 1-10 mm. 3 The microcapsules may be spherical, ellipsoidal, or gyroscope-shaped.

3. The display module according to claim 1, characterized in that, The matrix gel contains 5-30 microcapsules.

4. The display module according to claim 3, characterized in that, The volume of the bent optical adhesive area is V1, and the total volume of the microcapsule is V2, where V1:V2=1:(0.3-0.7).

5. The display module according to claim 1, characterized in that, The first reactive diluent and the second reactive diluent each independently comprise a combination of bifunctional monomers and monofunctional monomers; The mass concentration of the bifunctional monomer in the first reactive diluent is greater than the mass concentration of the bifunctional monomer in the second reactive diluent.

6. The display module according to claim 5, characterized in that, The mass ratio of bifunctional monomers to monofunctional monomers in the first reactive diluent is (3-7):1, and the mass ratio of bifunctional monomers to monofunctional monomers in the second reactive diluent is (1-3):

1.

7. The display module according to claim 5, characterized in that, The bifunctional monomer includes tripropylene glycol diacrylate, and the monofunctional monomer includes isobornyl acrylate.

8. The display module according to claim 1, characterized in that, The first colloid further includes a first photoinitiator and optionally other additives, and the matrix colloid further includes a second photoinitiator and optionally other additives.

9. The display module according to claim 1, characterized in that, The capsule wall is made of an epoxy resin composition.

10. A method for manufacturing a display module as described in any one of claims 1-9, characterized in that, The preparation method includes: A first prefabricated display module is obtained by bonding a display panel and a cover plate together using optical adhesive; the optical adhesive includes a bendable area, which includes a base adhesive and microcapsules placed in the base adhesive; The first prefabricated display module is bent to obtain the second prefabricated display module; the microcapsule ruptures during the bending process, releasing the first colloid into the matrix adhesive; The second prefabricated display module is cured to obtain the display module.

11. The preparation method according to claim 10, characterized in that, The microcapsules are placed in the matrix gel of the bendable area by injection.

12. A display device, characterized in that, The display device includes the display module as described in any one of claims 1-9.

Images