Display module and display terminal

Abstract

According to the display module and the display terminal, the edge of a metal supporting layer on the back of a display panel shrinks inwards to form a reserved space, and a flush box dam structure is arranged, so that on one hand, high-temperature melting and edge defects in the integrated cutting process of the display module can be avoided, and the structural stability and the production efficiency are improved; the dam structure design of 3D dispensing can eliminate the problem of film layer stacking segment difference caused by inward shrinkage of the edge of the metal supporting layer, so that the appearance is improved, the film layer can be prevented from being invaded by water vapor, and the service life of the display module is prolonged.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display module and a display terminal. Background Technology

[0002] In the stacked design of display modules, to optimize structural performance, existing technologies often use a stainless steel support layer to replace the original backplate structure under the display panel. However, when the stainless steel support layer and the display panel are cut together using an integrated cutting process, it not only increases the cutting time but also easily leads to quality defects such as edge melting and jagged edges, seriously affecting the production efficiency and product yield of the display module.

[0003] Existing technologies have shortcomings that urgently need to be addressed. Summary of the Invention

[0004] This application provides a display module and a display terminal that can avoid high-temperature melting and edge defects during the integrated cutting process of the display module, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, this application proposes a display module, comprising at least a display panel and a composite support structure located on the back side of the display panel, the composite support structure comprising: A metal support layer is disposed on the back side of the display panel; A foam layer is disposed on the side of the metal support layer away from the display panel; and, A heat dissipation layer is disposed on the side of the foam layer away from the metal support layer; The edge of the metal support layer is recessed relative to the edge of the display panel to form a reserved space. A dam structure is provided in the reserved space, and the dam structure is flush with the edge of the reserved space in both the width and thickness directions.

[0006] Optionally, the dam structure is formed by curing liquid adhesive applied in 3D.

[0007] Optionally, the dam structure and the metal support layer have the same elastic modulus.

[0008] Optionally, the metal support layer is a SUS stainless steel layer with a thickness of 20μm-50μm, and an insulating coating is provided on the side of the metal support layer facing the display panel, the insulating coating having a thickness of 5μm-20μm.

[0009] Optionally, the liquid adhesive forming the dam structure is a modified thermosetting epoxy resin adhesive, and the elastic modulus of the liquid adhesive after curing is 180GPa-220GPa.

[0010] Optionally, the dam structure is embedded with a number of shape memory alloy particles arranged in an array.

[0011] Optionally, the display panel has a perforated area, and the metal support layer has an opening that is aligned with the perforated area; Wherein, the diameter of the opening is larger than the diameter of the excavation area, and the dam structure is provided on the edge of the opening relative to the area recessed inward from the excavation area.

[0012] Optionally, the dam structure located at the edge of the opening is annular, with the outer ring of the dam structure connected to the opening and the inner ring of the dam structure flush with the edge of the excavated area. Optionally, the heat dissipation layer is a copper foil heat dissipation layer, which covers the surface of the foam layer away from the metal support layer, and the edge of the copper foil heat dissipation layer does not extend beyond the outer edge of the dam structure.

[0013] According to another aspect of this application, a display terminal is proposed, which includes all the technical features of the above-mentioned display module.

[0014] The display module of this application embodiment forms a reserved space by indenting the edge of the metal support layer and setting a flush dam structure. On the one hand, it can avoid high-temperature melting and edge defects during the integrated cutting process of the display module, improve structural stability and production efficiency. On the other hand, the dam structure design of 3D dispensing can eliminate the problem of film layer stacking step difference caused by the indentation of the edge of the metal support layer, thereby improving the appearance and preventing the film layer from being invaded by moisture, thus improving the service life of the display module.

[0015] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0017] Figure 1 This is a schematic diagram of the display module stacked structure provided in an exemplary embodiment of this disclosure. Figure 1 ; Figure 2 This is a schematic diagram of the display module stacked structure provided in an exemplary embodiment of this disclosure. Figure 2 ; Figure 3 This is a schematic diagram of the metal support layer structure provided in an exemplary embodiment of this disclosure; Figure 4 This is a schematic diagram of the display module stacked structure provided in an exemplary embodiment of this disclosure. Figure 3 .

[0018] Explanation of reference numerals in the attached figures: 10. Display module; 101. Display panel; 102. Metal support layer; 103. Foam layer; 104. Heat dissipation layer; 105. Dam structure; 106. Polarizing film; 107. Cover plate; 108. Optical adhesive; 109. Cutout area; 110. Opening; 111. Functional component; 112. Insulating coating; 113. Pressure-sensitive adhesive. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0020] In existing display module stacking designs, stainless steel support layers are often used to replace the underlying backplate structure of the display panel. However, when the stainless steel support layer and the display panel are cut together using an integrated cutting process, it not only increases the cutting time but also easily leads to quality defects such as edge melting and jagged edges, seriously affecting the production efficiency and product yield of the display module.

[0021] In response, this application proposes a display module 10, please refer to [link / reference]. Figures 1-3 The device includes at least a display panel 101 and a composite support structure located on the back side of the display panel 101. The composite support structure includes a metal support layer 102 disposed on the back side of the display panel 101; a foam layer 103 disposed on the side of the metal support layer 102 away from the display panel 101; and a heat dissipation layer 104 disposed on the side of the foam layer 103 away from the metal support layer 102. The edge of the metal support layer 102 is recessed relative to the edge of the display panel 101 to form a reserved space, and a dam structure 105 is disposed within this reserved space. The dam structure 105 is flush with the edge of the reserved space in both its width and thickness directions. This structural design effectively avoids the integral cutting of the display panel 101 and the metal support layer 102, thereby solving the problems of low cutting efficiency and poor edge quality in the prior art. Furthermore, by filling the reserved space with the dam structure 105, the film layer stacking difference caused by the recessed edge of the metal support layer 102 can be further eliminated.

[0022] On the light-emitting side of the display panel 101, there are films such as a polarizer 106 and a cover plate 107. The polarizer 106 and the cover plate 107 are bonded together by optical adhesive 108.

[0023] This embodiment provides a display module 10. The display module 10 can be constructed to include a display panel 101 for image display. A composite support structure can be configured on the back side of the display panel 101 to provide mechanical support and protection for the display panel 101. The display panel 101 and the composite support structure can be connected using optical adhesive, pressure-sensitive adhesive 113, or mechanical clips.

[0024] The composite support structure can be designed as a multi-layered stack. The metal support layer 102 can be placed near the back of the display panel 101, and can be made of various metal materials, such as aluminum, titanium, or ordinary steel, with its thickness selected according to the required rigidity. The foam layer 103 can be disposed on the side of the metal support layer 102 away from the display panel 101, and can be made of an elastic polymer material to provide cushioning and filling. The heat dissipation layer 104 can be disposed on the side of the foam layer 103 away from the metal support layer 102, and can be made of thermally conductive materials, such as thermally conductive adhesive, thermally conductive pads, or thin metal sheets, to facilitate heat conduction. These layers can be bonded together by adhesive, lamination, or hot pressing.

[0025] To avoid direct alignment between the metal support layer 102 and the edge of the display panel 101, the external dimensions of the metal support layer 102 can be designed to be smaller than those of the display panel 101. Specifically, the edge of the metal support layer 102 can be recessed inward, forming a surrounding gap area, i.e., a reserved space, between it and the edge of the display panel 101. This recessed setting can be achieved through precise cutting, stamping, or die-forming processes.

[0026] Within the pre-formed space, a dam structure 105 can be filled or installed. The dam structure 105 can be formed from various materials, such as prefabricated plastic strips, rubber strips, or formed by filling with a curing material. Its main function is to fill the pre-formed space, providing edge support or sealing. The dam structure 105 can be placed directly within the pre-formed space or fixed with adhesive.

[0027] After the dam structure 105 is installed in the reserved space, its external dimensions can be designed to match the width of the reserved space in the width direction and the height of the reserved space in the thickness direction. This means that the outer edge of the dam structure 105 can be aligned with the edge of the display panel 101, and its top surface can be flush with the surface of the metal support layer 102 or other layers of the composite support structure to ensure the flatness of the edge of the display module 10 and the overall aesthetics.

[0028] Based on the above structure, this application effectively avoids the process requirement of integrally cutting the display panel 101 and the metal support layer 102 by setting the edge of the metal support layer 102 inward relative to the edge of the display panel 101, forming a reserved space and filling the dam structure 105. This significantly reduces cutting time and fundamentally eliminates quality defects such as edge melting and jagged edges that may result from integral cutting. Therefore, this application can effectively improve the production efficiency and product yield of the display module 10. See Figure 1 and Figure 2 This application further proposes that the dam structure 105 is formed by curing liquid adhesive applied in 3D.

[0029] Specifically, 3D dispensing is a technology for precisely controlling the deposition of fluid materials in three-dimensional space. It utilizes automated equipment and precision jetting or extrusion systems to accurately apply liquid materials to a target area according to a pre-set path and thickness. For example, jet dispensing technology can be used to spray adhesive as tiny droplets onto the substrate through high-frequency vibration or piezoelectric effect, achieving non-contact dispensing, suitable for high-speed, high-precision, and complex shape deposition; or extrusion dispensing technology can be used to extrude adhesive from a needle or nozzle under pressure, forming continuous lines or dots, suitable for thicker adhesive layers or applications requiring high adhesion. 3D dispensing technology ensures the precise position and shape of the dam structure 105 within the reserved space, avoiding deviations caused by traditional methods.

[0030] Liquid adhesives are materials that are fluid when applied, capable of filling irregular surfaces and gaps, and forming bonded or support structures during subsequent curing. Their selection is typically based on the required bond strength, elasticity, temperature resistance, curing speed, and compatibility with the substrate. For example, epoxy resin adhesives can be used, offering excellent bond strength, chemical resistance, and mechanical properties, forming rigid or flexible structures after curing; polyurethane adhesives can be used, offering good elasticity and flexibility, resistance to impact and vibration, and suitability for structures requiring cushioning or deformation capacity; or silicone adhesives can be used, offering excellent high and low temperature resistance, weather resistance, and flexibility, often used in sealing and cushioning applications. Liquid adhesives flow easily and fill pre-filled spaces, providing stable support and sealing after curing.

[0031] Curing refers to the process by which liquid adhesive transforms from a liquid to a solid or semi-solid state through physical or chemical reactions, thereby obtaining its final mechanical properties and structural stability. Curing methods can include thermal curing, which involves heating to cause a chemical reaction in the adhesive components, such as placing the display module 10 in an oven and curing it at a specific temperature and time; or ultraviolet (UV) curing, which uses ultraviolet light to trigger a photoinitiator reaction in the adhesive, resulting in rapid curing. This method is suitable for transparent or semi-transparent adhesives and requires precise control of the curing area. The curing process ensures that the liquid adhesive forms a robust and stable dam structure 105 after filling the reserved space, providing reliable support and sealing functions.

[0032] By utilizing the reserved space formed by the inward retraction of the metal support layer 102, 3D dispensing technology can precisely fill liquid adhesive into this specific area, forming a dam structure 105 flush with the edge of the reserved space. This precise formation method ensures a tight fit between the dam structure 105 and the edge of the display panel 101, effectively preventing the intrusion of external moisture and dust, and providing uniform and stable edge support for the display panel 101, thereby improving the overall structural reliability and service life of the display module 10.

[0033] This application further proposes that the dam structure 105 and the metal support layer 102 have the same elastic modulus.

[0034] When the dam structure 105 and the metal support layer 102 have the same elastic modulus, it means that the elastic deformation of the two materials will be consistent or highly similar under the same stress.

[0035] Through the above technical solution, the dam structure 105 and the metal support layer 102 have the same elastic modulus, ensuring that during the operation of the display module 10, when subjected to thermal expansion caused by temperature changes or external mechanical loads, the dam structure 105 and the metal support layer 102 can elastically deform in a similar manner. This coordinated deformation behavior effectively avoids stress concentration at the interface caused by mismatch in elastic modulus. Therefore, it can significantly reduce the risk of the dam structure 105 cracking or peeling off from the reserved space, thereby enhancing the support stability of the dam structure 105 on the edge of the display panel 101, improving the overall reliability and durability of the composite support structure, and ensuring the stable performance of the display module 10 during long-term use. This application further proposes that the metal support layer 102 is a SUS stainless steel layer with a thickness of 20μm-50μm; an insulating coating 112 is provided on the side of the metal support layer 102 facing the display panel 101, and the insulating coating 112 has a thickness of 5μm-20μm.

[0036] Specifically, the metal support layer 102 is made of SUS stainless steel, a material with excellent strength, toughness, corrosion resistance, and good processing performance. Besides SUS stainless steel, the metal support layer 102 can also be made of other high-strength, corrosion-resistant metal materials, such as titanium alloys or aluminum alloys, to meet different structural strength and environmental adaptability requirements. The thickness of the metal support layer 102 is set within the range of 20μm-50μm to balance its structural support capacity with processing ease, avoiding increased processing difficulty due to excessive thickness or reduced load-bearing capacity due to excessive thinness.

[0037] An insulating coating 112 is provided on the side of the metal support layer 102 facing the display panel 101. This insulating coating 112 is a material layer with electrical insulating properties, which effectively isolates the conductive metal support layer 102 from the display panel 101, preventing unnecessary electrical contact between the two and thus avoiding problems such as electrical signal interference or short circuits. The insulating coating 112 can be implemented using various materials and processes; for example, it can be a polyimide (PI) coating, an epoxy resin coating, or an alumina ceramic coating, and can be uniformly applied to the surface of the metal support layer 102 by spraying, roller coating, or electrophoretic coating.

[0038] The thickness of the insulating coating 112 is 5μm-20μm. This thickness range is carefully designed to ensure that the insulating coating 112 provides sufficient electrical insulation while avoiding a decrease in overall structural compactness due to excessive thickness, or an insufficient insulating effect due to excessive thinness. In practical applications, the thickness of the insulating coating 112 can be adjusted to other ranges, such as 3μm-10μm or 15μm-30μm, depending on specific insulation requirements and the dielectric properties of the selected materials, to adapt to different design needs.

[0039] Through the above technical solution, the metal support layer 102, using specific materials and thickness, and supplemented with an insulating coating 112, effectively solves the quality problems that may occur in the manufacturing process of the display module 10, such as increased cutting time, edge melting, and serrations. The use of SUS stainless steel ensures structural strength and processing performance, while precise thickness control optimizes material utilization and processing efficiency. The setting and thickness limitation of the insulating coating 112 not only effectively prevents electrical contact interference and improves the electrical reliability of the display module 10, but also avoids a decrease in production yield due to insulation problems. This solution significantly improves the manufacturing efficiency and product quality of the display module 10 while ensuring that the metal support layer 102 provides structural support and has the same elastic modulus as the dam structure 105. This application further proposes that the liquid adhesive used to form the dam structure 105 is a modified thermosetting epoxy resin adhesive, and the elastic modulus of the liquid adhesive after curing is 180GPa-220GPa.

[0040] The modified thermosetting epoxy resin adhesive is a chemically modified epoxy resin-based material that undergoes an irreversible curing reaction upon heating, forming a solid structure with specific physical and chemical properties. As the base material of the dam structure 105, it provides excellent adhesive strength, chemical resistance, and mechanical properties. Through modification, it is endowed with low volume shrinkage and adjustable elastic modulus during curing, thus laying the material foundation for solving the curing shrinkage problem and achieving elastic modulus matching with the metal support layer 102. One approach is to introduce reactive diluents or epoxy monomers with low shrinkage characteristics into the epoxy resin system, such as certain alicyclic epoxy resins or monomers with ring-opening polymerization mechanisms, to reduce changes in intermolecular spacing during curing. Another approach is to incorporate a specific proportion of inorganic fillers, such as nano-silica or alumina particles. These fillers themselves do not shrink, effectively diluting the shrinkage effect of the resin matrix while also adjusting the mechanical properties of the material.

[0041] The adhesive, after curing, has an elastic modulus of 180 GPa to 220 GPa. Elastic modulus is a physical quantity that measures a material's resistance to elastic deformation, representing the ratio of stress to strain within its elastic range. Controlling the elastic modulus of the cured dam structure 105 within the range of 180 GPa to 220 GPa aims to match its mechanical properties with those of the metal support layer 102 (e.g., the elastic modulus of stainless steel is typically within this range). This matching ensures that when the display module 10 is subjected to external stress or temperature changes, stress can be uniformly transferred between the dam structure 105 and the metal support layer 102, avoiding stress concentration caused by excessive differences in elastic modulus, thereby improving the overall stability and reliability of the structure.

[0042] The volume shrinkage rate during the curing process of the adhesive is ≤3%. Volume shrinkage rate refers to the percentage decrease in volume of the liquid adhesive relative to its initial liquid volume during the curing process. Strictly controlling the volume shrinkage rate during curing to no more than 3% is key to directly solving the problems of deformation, cracking, or detachment from the reserved space edge that may occur in the dam structure 105 after curing. A low volume shrinkage rate ensures that the dam structure 105 maintains its expected geometric shape and dimensional accuracy after molding, ensuring a tight fit with the edge of the display panel 101, thereby maintaining the structural integrity and long-term reliability of the display module 10. Epoxy resin systems with low or zero shrinkage characteristics can be used, such as certain cationic ring-opening polymeric epoxy resins, which have small volume changes during polymerization. Alternatively, additives with an expansion effect, such as certain special expansion agents or materials with phase change properties, can be introduced into the adhesive formulation. These additives can produce slight volume expansion during curing, thereby offsetting or partially offsetting the shrinkage of the epoxy resin and controlling the net shrinkage rate within the target range.

[0043] This application further proposes that a number of shape memory alloy particles arranged in an array are embedded inside the dam structure 105.

[0044] Shape memory alloys (SMAs) are smart materials that, after undergoing deformation, can recover their original, preset shape upon external stimulation such as heating or cooling. Common SMAs include nickel-titanium alloys, copper-zinc-aluminum alloys, and copper-aluminum-nickel alloys. These alloys undergo a martensitic phase transformation at specific temperatures, thus exhibiting a shape memory effect. "Array distribution" refers to the regular, organized arrangement of SMA particles within the dam structure 105, such as a uniformly spaced grid, linear arrangement, or concentric circle arrangement. This distribution helps ensure uniform stress distribution among the particles within the dam structure 105, avoiding localized stress concentrations, thereby guaranteeing the integrity and stability of the dam structure 105 during deformation.

[0045] The shape memory alloy particles have a particle size of 50μm-200μm. This particle size range is crucial for the performance of the shape memory alloy particles in the dam structure 105. Particles with a size of 50μm-200μm ensure good dispersibility and embeddability within the dam structure 105 (formed by curing liquid adhesive), preventing agglomeration or sedimentation. They also ensure that individual particles possess sufficient deformation capacity and driving force to effectively influence the overall expansion of the dam structure 105. If the particle size is too small, the driving force may be insufficient to cause macroscopic deformation of the dam structure 105; if the particle size is too large, it may affect the mechanical properties and uniformity of the dam structure 105, or even lead to defects within the dam structure 105.

[0046] When the ambient temperature exceeds a preset threshold, the shape memory alloy particles deform and drive the dam structure 105 to slightly expand outwards into the reserved space. When the ambient temperature reaches or exceeds a preset phase transformation temperature threshold, the shape memory alloy particles undergo a martensitic phase transformation, changing from a low-temperature martensite phase to a high-temperature austenite phase, and recovering their preset shape in the process. This shape recovery generates an outward expansion force, thereby driving the dam structure 105 into which they are embedded to slightly expand outwards into the reserved space.

[0047] By embedding shape memory alloy particles in an array within the dam structure 105 and precisely controlling their particle size within the range of 50μm-200μm, this application effectively solves the problem of insufficient bonding pressure or structural failure of the dam structure 105 when the ambient temperature changes. Specifically, when the ambient temperature exceeds a preset threshold, the shape memory alloy particles can deform in response to the temperature change, thereby driving the dam structure 105 to micro-expand outwards into the reserved space. This temperature-responsive micro-expansion mechanism can actively compensate for dimensional changes caused by temperature fluctuations, thereby significantly improving the bonding pressure between the dam structure 105 and the edge of the display panel 101. This not only enhances the sealing and support of the dam structure 105 for the edge of the display panel 101, effectively preventing the intrusion of external environmental factors such as moisture and dust, but also significantly improves the structural stability and reliability of the display module 10 under different temperature conditions, avoiding the risk of cracking or peeling of the dam structure 105 due to temperature stress, thus extending the service life of the display module 10. See Figure 4 In some of the solutions described above in this application, a dam structure 105 is proposed to provide edge support and sealing. However, when the display panel 101 has a perforated area, the cutting and setting of the opening edge of the metal support layer 102 may also lead to problems such as edge melting, jagged edges, or insufficient sealing.

[0048] In this regard, this application further proposes a display module 10, wherein the display panel 101 has a perforated area 109, and the metal support layer 102 has an opening 110 aligned with the perforated area 109; wherein the diameter of the opening 110 is larger than the diameter of the perforated area 109, and the edge of the opening 110 is provided with a dam structure 105 in the area that is recessed relative to the perforated area 109.

[0049] Specifically, the display panel 101 has a punch-hole area 109, which refers to a non-display area reserved for specific functional components 111 (such as cameras, sensors, earpieces, etc.) on the display panel 101, and is typically formed by processes such as laser cutting, stamping, or etching. The punch-hole area 109 can be of various geometric shapes, such as circular, elliptical, rectangular, or irregular, and its position and size are determined according to the specific design and functional requirements of the display module 10. For example, it can be a circular punch-hole for a front-facing camera or a rectangular punch-hole for an ambient light sensor.

[0050] Meanwhile, the metal support layer 102 has an opening 110 that is aligned with the aforementioned perforated area 109. This opening 110 is designed to provide structural support for the perforated area 109 of the display panel 101 and ensure the proper functioning of the functional components within the perforated area 109. Alignment means that the center or geometry of the opening 110 is precisely aligned with the perforated area 109 to avoid structural stress, functional obstruction, or assembly difficulties caused by misalignment.

[0051] Furthermore, the diameter of the opening 110 is larger than the diameter of the perforated area 109. This design provides a radial gap between the opening 110 and the perforated area 109, reserving the necessary space for the subsequent installation of the dam structure 105. This gap helps prevent the edge of the opening 110 of the metal support layer 102 from directly contacting the edge of the perforated area 109 of the display panel 101, thereby reducing the transmission of cutting stress and potential edge damage.

[0052] Based on this, a dam structure 105 is provided in the recessed area between the edge of the opening 110 and the recessed area 109. The dam structure 105, located in the recessed area between the edge of the opening 110 and the recessed area 109, aims to utilize its filling, supporting, and sealing properties to compensate for potential cutting defects (such as burrs or unevenness) at the edge of the opening 110 in the metal support layer 102, and to provide additional structural strength and sealing. This helps protect the edge of the recessed area 109 from dust, moisture, etc., and enhances the bonding stability between the display panel 101 and the metal support layer 102 in this area. The dam structure 105 can be formed by curing liquid adhesive through a 3D dispensing process, such as epoxy resin or silicone adhesive, which have a certain degree of elasticity and adhesion after curing.

[0053] Furthermore, the dam structure 105 located at the edge of the opening 110 is annularly arranged. The outer ring of the dam structure 105 is connected to the opening 110, and the inner ring of the dam structure 105 is flush with the edge of the cutout area 109. The annular structure of the dam structure 105 is designed to fill the area formed by the inward retraction of the edge of the opening 110 relative to the cutout area 109, and also to reserve a light-transmitting area corresponding to the cutout area 109, providing a light channel for specific functional components 111 (such as a light sensor) under the screen. At the same time, the inner ring of the dam structure 105 is flush with the edge of the cutout area 109 to avoid the width of the dam structure 105 from affecting the light-transmitting area of ​​the light channel, thereby affecting the light-collecting amount of the light sensor.

[0054] In some embodiments of this application, a heat dissipation layer 104 is proposed to provide heat dissipation function. However, if the edge of the heat dissipation layer 104 extends beyond the outer edge of the dam structure 105, it may cause quality defects such as edge melting and jagged edges during the manufacturing process, affecting the production efficiency and product yield of the display module 10.

[0055] In this regard, this application further proposes that the heat dissipation layer 104 is a copper foil heat dissipation layer 104, the copper foil heat dissipation layer 104 covers the surface of the foam layer 103 away from the metal support layer 102, and the edge of the copper foil heat dissipation layer 104 does not extend beyond the outer edge of the dam structure 105.

[0056] Specifically, the heat dissipation layer 104 is a copper foil heat dissipation layer 104. The copper foil heat dissipation layer 104 refers to a structural layer made primarily of copper foil used for conducting and dissipating heat. Copper, as a metal, has excellent thermal conductivity, enabling it to efficiently conduct heat from the module's interior to the external environment. Copper foil typically has good ductility and electrical conductivity, is easily processed into thin sheets, and effectively conducts heat. Its thickness can be selected according to actual heat dissipation requirements and structural space; for example, copper foil with a thickness ranging from several micrometers to tens of micrometers can be used. Besides pure copper foil, it can also be copper foil with surface treatments (such as oxidation or coating) or composites with other materials (such as graphene composite copper foil) to further improve heat dissipation efficiency or mechanical properties.

[0057] The copper foil heat dissipation layer 104 covers the surface of the foam layer 103 away from the metal support layer 102. The foam layer 103 typically has a certain thickness and elasticity, and may serve as a buffer, seal, or heat insulation in the display module 10. The fact that the copper foil heat dissipation layer 104 covers the side of the foam layer 103 away from the metal support layer 102 means that it is located on the outside of the foam layer 103, closer to the external environment of the module. This covering method ensures that heat generated inside or beneath the foam layer 103 can be conducted through the foam layer 103 to the copper foil heat dissipation layer 104, and then efficiently dissipated by the copper foil heat dissipation layer 104. The covering can be achieved through bonding, lamination, or other methods to ensure efficient heat conduction.

[0058] The edge of the copper foil heat dissipation layer 104 does not extend beyond the outer edge of the dam structure 105. The dam structure 105 is a structure disposed within the reserved space formed by the inward recess of the edge of the metal support layer 102, and its function may be to provide support, seal, or restrict the flow of adhesive, etc. The fact that the edge of the copper foil heat dissipation layer 104 does not extend beyond its outer edge means that the copper foil heat dissipation layer 104 is covered or confined within the dam structure 105. This precise edge alignment or inward recess design aims to prevent the copper foil heat dissipation layer 104 from forming a protrusion at the edge of the module. By ensuring that its edge does not extend beyond the dam structure 105, the heat dissipation layer 104 can be effectively protected, and the flatness and integrity of the module edge can be maintained.

[0059] By employing highly thermally conductive copper foil as the heat dissipation layer 104, the heat accumulated in the foam layer 103 can be effectively conducted to the external environment, improving overall heat dissipation performance. Simultaneously, by confining the edge of the copper foil heat dissipation layer 104 within the outer edge of the dam structure 105, defects such as melting, jagged edges, and burrs caused by protruding edges of the heat dissipation layer 104 during module manufacturing are avoided. This precise structural design not only maintains the flatness and structural integrity of the display module 10's edges but also significantly reduces the defect rate during production, thereby improving production efficiency and product yield. Through the above design, the display module 10 of this embodiment successfully avoids the problems caused by the traditional one-piece cutting process, realizes independent optimized processing of the display panel 101 and the support structure, and ensures the structural integrity, sealing, thermal management performance and long-term reliability of the module through the dam structure 105 and its series of enhancement designs.

[0060] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0061] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0062] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0063] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A display module, characterized in that, It includes at least a display panel and a composite support structure located on the back side of the display panel, the composite support structure comprising: A metal support layer is disposed on the back side of the display panel; A foam layer is disposed on the side of the metal support layer away from the display panel; and, A heat dissipation layer is disposed on the side of the foam layer away from the metal support layer; The edge of the metal support layer is recessed relative to the edge of the display panel to form a reserved space. A dam structure is provided in the reserved space, and the dam structure is flush with the edge of the reserved space in both width and thickness directions.

2. The display module according to claim 1, characterized in that, The dam structure is formed by curing liquid adhesive applied using 3D dispensing.

3. The display module according to claim 2, characterized in that, The dam structure and the metal support layer have the same elastic modulus.

4. The display module according to claim 3, characterized in that, The metal support layer is a SUS stainless steel layer with a thickness of 20μm-50μm. An insulating coating with a thickness of 5μm-20μm is provided on the side of the metal support layer facing the display panel.

5. The display module according to claim 3, characterized in that, The liquid adhesive used to form the dam structure is a modified thermosetting epoxy resin adhesive, and the elastic modulus of the liquid adhesive after curing is 180GPa-220GPa.

6. The display module according to claim 2, characterized in that, The dam structure is embedded with several shape memory alloy particles arranged in an array.

7. The display module according to any one of claims 1 to 6, characterized in that, The display panel has a perforated area, and the metal support layer has an opening that is aligned with the perforated area. Wherein, the diameter of the opening is larger than the diameter of the excavation area, and the dam structure is provided on the edge of the opening relative to the area recessed inward from the excavation area.

8. The display module according to claim 7, characterized in that, The dam structure located at the edge of the opening is arranged in a ring shape. The outer ring of the dam structure is connected to the opening, and the inner ring of the dam structure is flush with the edge of the excavation area.

9. The display module according to claim 1, characterized in that, The heat dissipation layer is a copper foil heat dissipation layer, which covers the surface of the foam layer away from the metal support layer, and the edge of the copper foil heat dissipation layer does not extend beyond the outer edge of the dam structure.

10. A display terminal, characterized in that, Includes the display module as described in any one of claims 1 to 9.

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