Folding screen device and electronic equipment

Abstract

The invention discloses a folding screen device and electronic equipment, and relates to the technical field of folding screens. The folding screen device comprises a protective layer, a first adhesive layer, a display layer, a second adhesive layer and a supporting layer which are sequentially stacked, wherein at least one of the first adhesive layer and the second adhesive layer is internally provided with a net-shaped structure, and the net-shaped structure is formed by linking a plurality of microsphere particles through branched chains; under the condition that the folding screen device is in a first stress state, the net-shaped structure is in a first connection state; under the condition that the folding screen device is in the second stress state, the net-shaped structure is in the second connection state, and the pressure borne by the folding screen device in the second stress state is larger than that borne by the folding screen device in the first stress state; the stress of the second connection state is greater than that of the first connection state.

Description

Technical Field

[0001] This application relates to the technical field of folding screens, and particularly relates to a folding screen device and an electronic device. Background Art

[0002] In the related art, a folding screen generally includes a protective layer, an upper layer of Optical Clear Adhesive (OCA) layer, a display layer, a lower layer of OCA layer, and a support backplane from top to bottom. Among them, the flexible cover plate, the display layer, and the support backplane are made of relatively hard materials. Therefore, when bending, the interlayer stress is large, and a soft, substrate-free OCA is required for bonding to buffer the interlayer stress and reduce the damage to the display layer.

[0003] Currently, there is a quite strong demand for thinness and low creases in folding screens. After the folding screen is made thin, the thickness of each film layer and adhesive layer will be reduced, resulting in a decrease in the strength of the folding screen, and further leading to a decline in the impact resistance of the folding screen. It can be seen that in the related art, the folding screen device has the problem of poor impact resistance. Summary of the Invention

[0004] This application provides a folding screen device and an electronic device, which can improve the impact resistance of the folding screen device.

[0005] In a first aspect, this application provides a folding screen device, including: a protective layer, a first adhesive layer, a display layer, a second adhesive layer, and a support layer that are sequentially stacked;

[0006] Wherein, in at least one of the first adhesive layer and the second adhesive layer, a network structure is provided inside, and the network structure is a network structure formed by multiple microsphere particles linked by branched chains;

[0007] When the folding screen device is in a first stress state, the network structure is in a first connection state;

[0008] When the folding screen device is in a second stress state, the network structure is in a second connection state, where the pressure received by the folding screen device in the second stress state is greater than the pressure received by the folding screen device in the first stress state, and the stress in the second connection state is greater than the stress in the first connection state.

[0009] In a second aspect, this application provides an electronic device, including the folding screen device described in the first aspect.

[0010] In the embodiments of the present application, by providing a network structure in the adhesive layer of the folding screen device, since the network structure is a network structure formed by a plurality of microsphere particles linked by branched chains, the microsphere particles inside the adhesive layer can be linked together through the branched chains to form a topologically close-packed network sea-island structure. At the same time, since the network structure is in a straightened state when the folding screen device is in a stressed state, and the straightened network structure can disperse the impact force received by the folding screen device, which is beneficial to improving the impact resistance of the folding screen device. Description of the Drawings

[0011] Figure 1 is a cross-sectional view of the folding screen device provided by the embodiments of the present application;

[0012] Figure 2 is a comparison diagram of the front and back of the annular branched chain on the surface of the microsphere particle before and after dismemberment in the embodiments of the present application;

[0013] Figure 3 is a schematic diagram of the network structure switching from the free bending state to the straightened state in the embodiments of the present application;

[0014] Figure 4 is a comparison diagram of the network structure before and after receiving an impact force in the embodiments of the present application;

[0015] Figure 5 is a comparison diagram of the process of bending with and without adding microspheres in the embodiments of the present application;

[0016] Figure 6 is Figure 5 a partial enlarged view of part A in Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0018] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. generally belong to the same category, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0019] The following will, in conjunction with the accompanying drawings, through specific embodiments and their application scenarios, provide a detailed description of a folding screen device and an electronic device provided by an embodiment of the present application.

[0020] Please refer to Figure 1 , an embodiment of the present application provides a folding screen device, and the folding screen device includes: a protective layer 100, a first adhesive layer 200, a display layer 300, a second adhesive layer 400, and a support layer 500 that are sequentially stacked;

[0021] Among them, in the first adhesive layer 200 and the second adhesive layer 400, at least one of them is internally provided with a network structure 600, and the network structure 600 is a network structure 600 formed by linking a plurality of microsphere particles 610 through branched chains 620.

[0022] It can be understood that the above folding screen device can be used as a screen module of various folding screen devices.

[0023] The above protective layer 100 can be various types of flexible covers, that is, the protective layer 100 is the outermost layer of the folding screen device. During the process where the user interacts with the folding screen device, the touch operation on the folding screen device directly acts on the protective layer 100;

[0024] When the folding screen device is in the first stress state, the network structure 600 is in the first connection state;

[0025] When the folding screen device is in the second stress state, the network structure 600 is in the second connection state. Among them, the pressure received by the folding screen device in the second stress state is greater than the pressure received by the folding screen device in the first stress state, and the stress in the second connection state is greater than the stress in the first connection state.

[0026] Among them, the first stress state can be that the folding screen device is in a non-stressed state, or a state where no external force impact is received, or other states except the state of receiving an external force impact. Correspondingly, the second stress state can refer to: the state where the folding screen device receives various external force impacts.

[0027] Since the folding screen device receives an external force impact in the second stress state, and in the first stress state, no external force impact is received, therefore, the pressure received by the folding screen device in the second stress state is greater than the pressure received by the folding screen device in the first stress state. Among them, the pressure can be the impact force during the impact process.

[0028] The stress in the second connection state described above may refer to the internal stress of the network structure 600 when the network structure 600 is in the second connection state. Correspondingly, the stress in the first connection state may refer to the internal stress of the network structure 600 when the network structure 600 is in the first connection state.

[0029] The above microsphere particles 610 may have a core-shell structure. Here, the core-shell structure means that a core is composed of particles with a micron or nanometer size, and then one or more layers of uniform heterogeneous or homogeneous materials are coated on the core to form a shell 612, and the core and the shell 612 are connected by electrostatic action or chemical bond action. In the embodiments of the present application, the microsphere particles 610 may be a core-shell structure formed by chemically bonding a heterogeneous shell 612 to micron-sized particles.

[0030] Among them, the above first adhesive layer 200 and second adhesive layer 400 may both be OCA adhesive layers.

[0031] It can be understood that the above protective layer 100, display layer 300, and support layer 500 may be the protective layer 100, display layer 300, and support layer 500 in various types of display screens in the related art.

[0032] In some embodiments of the present application, the above network structure 600 may be provided in the first adhesive layer 200 and the second adhesive layer 400 respectively. In other embodiments of the present application, the network structure 600 may also be provided only in one of the first adhesive layer 200 and the second adhesive layer 400, and specifically may be set according to needs.

[0033] The above free bending state may be a state of disordered arrangement. At this time, the network structure 600 can be regarded as a non-force-bearing state, that is, the branches 620 in the network structure 600 are in a non-force-bearing state, and different branches 620 in the network structure 600 may present different states. For example, different branches 620 in the network structure 600 may present bends at different angles or be in a straight state, etc. Please refer to Figure 3 (a) is a schematic diagram of the network structure 600 in the free bending state. Correspondingly, the above straightening state may refer to an ordered arrangement state. At this time, the network structure 600 is in a force-bearing state, that is, the branches 620 in the network structure 600 are in a force-bearing state. Specifically, each branch 620 is straightened under the action of an external force, so as to present a straight state. Please refer to Figure 3 (b) is a schematic diagram of the network structure 600 in the straightening state. It should be noted that Figure 3 (a) and Figure 3(b) is only an example of one form in the free bending state and the straightening state. In fact, the branched chains 620 in the network structure 600 can also exhibit other forms in the free bending state and the straightening state. It can be understood that the corresponding stress magnitudes inside the network structure 600 are different when it is in different connection states.

[0034] In this embodiment, by arranging the network structure 600 in the adhesive layer of the folding screen device, since the network structure 600 is a network structure 600 formed by linking a plurality of microsphere particles 610 through branched chains 620, the microsphere particles 610 inside the adhesive layer can be linked together through the branched chains 620 to form a topologically close-packed network island structure. At the same time, when the folding screen device is in a stressed state, the network structure 600 is in a straightened state, and the network structure 600 in the straightened state can disperse the impact force received by the folding screen device, thereby facilitating the improvement of the impact resistance of the folding screen device.

[0035] Optionally, in the network structure 600, each microsphere particle 610 is linked to at least one other microsphere particle 610 through a branched chain 620.

[0036] It should be noted that the number of surface branched chains 620 attached to the surface of the flexible housing 612 is not limited, as long as the following requirements are met: the number of connections between microspheres through the surface branched chains 620 is generally 2 to 3, and the remaining branched chains 620 can be interconnected with the OCA to increase the connection stability of the microspheres inside the OCA. The component of the surface annular branched chain 630 can be chemical functional groups such as tetrabutyl titanate and siloxane. On the one hand, it increases the adhesion between the microspheres and the OCA, preventing the separation of the microspheres from the OCA and the occurrence of bubble problems during the bending and dislocation process. On the other hand, the microspheres can be linked through the branched chains 620. When subjected to an external force impact, the microspheres change from disordered arrangement to topologically ordered arrangement, dispersing the external force impact and improving the impact resistance performance.

[0037] In this embodiment, since in the adhesive layer, each microsphere particle 610 is linked to at least one other microsphere particle 610 through a branched chain, the microsphere particles 610 in the adhesive layer can be interconnected to form the above-mentioned topologically close-packed network island structure.

[0038] Optionally, the branched chain 620 is formed after the annular branched chain 630 on the surface of the microsphere particle 610 with an annular branched chain 630 is mixed into the adhesive layer to which it belongs, and at least two branched chains 620 are formed after each annular branched chain 630 is fractured and dismembered. The branched chains 620 on the surfaces of different microsphere particles 610 can be interconnected to form the network structure 600.

[0039] In some embodiments of the present application, the above-mentioned network structure 600 may be a topologically close-packed network island structure formed by linking the branched chains 620 of each annular core-shell structure after the annular branched chains 630 on the surfaces of multiple annular core-shell structures are dismembered. Specifically, the basic composition of the annular core-shell structure may include: surface annular branched chains 630, flexible outer shell 612, and hard core. Before entering the OCA, the surface annular branched chains 630 surround the flexible outer shell 612 in a circular shape. After the annular core-shell structure and the OCA are doped together, the surface annular branched chains 630 are dismembered according to the principle of like dissolves like, forming branched chains 620 similar to an "octopus" shape. On the one hand, different microspheres can be linked by the branched chains 620, and have better impact resistance after being impacted. On the other hand, the branched chains 620 form an effective strong bond with the OCA, avoiding excessive displacement of the microspheres and the occurrence of delamination bubbles due to the misalignment of the OCA during bending. When the folding screen is impacted by blunt objects or sharp objects, the microspheres are arranged disorderly, and a topologically ordered arrangement with impact resistance is formed through the branched chains 620, which can play a key role in impact resistance. When the folding screen is bent, the microspheres with the flexible outer shell 612 are not easily deformed, and can also reduce the creep deformation of the OCA in the bending stress area, effectively reducing the generation of creases.

[0040] The above-mentioned topologically close-packed network island structure may refer to: similar to the mode in which small atoms form a close-packed layer, and large atoms are embedded in the interlayer gap to form a layered stacking. The network island refers to the arrangement of microspheres inside the OCA in a "island" form, and they are connected to each other through the surface branched chains 620. Among them, in the topologically close-packed network island structure, each microsphere is connected to at least 1 adjacent microsphere by a branched chain 620.

[0041] Please refer to Figure 2 , Figure 2 (a) shows the storage state of a single microsphere of the annular core-shell structure, which is composed of surface annular branched chains 630, flexible outer shell 612, and hard core. When the microsphere is doped into the glue layer, the surface annular branched chains 630 are dismembered, forming multiple structures similar to an "octopus", as shown in Figure 2 (b). Among them, after the annular branched chains 630 are dissolved in the OCA, they are dismembered into multiple branched chains 620 attached to the surface of the microsphere particles 610. And after the microsphere particles 610 enter the glue layer, the outer shell 612 on the surface of the microsphere particles 610 will always exist and will not dissolve in the OCA; The material selection of the flexible outer shell 612: polyurethane, polyurethane acrylate, acrylic resin, etc.

[0042] In this embodiment, after mixing the microsphere particles 610 with annular branches 630 into the adhesive layer, according to the principle of like dissolves like, the annular branches 630 on the surface of the microsphere particles 610 can be broken and dismembered to form "octopus-like" branches 620. On the one hand, different microspheres can be linked through the branches 620 to form the above-mentioned network structure 600, thereby improving the impact resistance of the folding screen device. On the other hand, the branches 620 can also form an effective strong bond with the OCA, avoiding the situation of excessive displacement of the microspheres and the occurrence of delamination bubbles due to the misalignment of the OCA during bending.

[0043] Optionally, the stress in the branch 620 in the second connection state is greater than the stress in the branch 620 in the first connection state.

[0044] The stress in the branch 620 in the second connection state mentioned above may refer to: when the network structure 600 is in the second connection state, the stress in the branch 620 inside the network structure 600. Correspondingly, the stress in the branch 620 in the first connection state may refer to: when the network structure 600 is in the first connection state, the stress in the branch 620 inside the network structure 600.

[0045] In some embodiments of the present application, the stress in the branch 620 in the first connection state may be 0. The stress in the branch 620 in the second connection state may be greater than 0.

[0046] Please refer to Figure 5 , Figure 5 (a) is a cross-sectional schematic diagram of the network structure 600 in the first connection state before the folding screen device is impacted by an external force. At this time, there are branches 620 in the bent state in the network structure 600. Figure 5 (b) is a cross-sectional schematic diagram of the network structure 600 in the second connection state after the folding screen device is impacted by an external force. At this time, all the branches 620 in the network structure 600 are in the straightened state. As Figure 5 can be seen, after the folding screen device is impacted by an external force, the arrangement of the microspheres is converted from disordered arrangement to topologically ordered arrangement, dispersing the impact external force.

[0047] In this embodiment, after the folding screen device is impacted by an external force, the network structure 600 can disperse the received impact force to the branches of the network structure 600, making the stress in the branch 620 increase, that is, the stress in the branch 620 in the second connection state is greater than the stress in the branch 620 in the first connection state. Since the network structure 600 can disperse the received impact force, the impact resistance of the folding screen device can be improved.

[0048] Optionally, the branched chain 620 and the glue layer in which the branched chain 620 is located are linked by chemical bonds;

[0049] In the network structure 600, the branched chain 620 and the linked microsphere particles 610 are linked by chemical bonds.

[0050] Among them, the branched chain 620 and the glue layer in which the branched chain 620 is located being linked by chemical bonds may mean that: the branched chain 620 in the first glue layer 200 is linked to the first glue layer 200 by chemical bonds; the branched chain 620 in the second glue layer 400 is linked to the second glue layer 400 by chemical bonds.

[0051] In the above-mentioned network structure 600, the branched chain 620 and the linked microsphere particles 610 being linked by chemical bonds may mean that: the branched chain 620 is linked to the outer shell 612 of the linked microsphere particles 610 by chemical bonds.

[0052] In this embodiment, since the branched chain 620 and the glue layer in which the branched chain 620 is located are linked by chemical bonds, and in the network structure 600, the branched chain 620 and the linked microsphere particles 610 are linked by chemical bonds, it can enable the microsphere particles 610 and the glue layer to form an effective strong adhesion, making the microsphere particles 610 and the glue layer integrate. In this way, during the folding process of the folding screen device, the microsphere particles 610 will not separate from the glue layer due to weak adhesion force, thereby improving the display life of the folding screen device. At the same time, since the microsphere particles 610 and the glue layer form an effective strong adhesion, it is difficult for the glue layer to generate excessive deformation relative to the glue layer, thereby preventing the glue layer from undergoing large creep deformation and reducing the crease height.

[0053] Optionally, the microsphere particles 610 include a core 611 and an outer shell 612, the core 611 and the outer shell 612 are connected by chemical bonds, and when the microsphere particles 610 are subjected to an external force, the outer shell 612 undergoes elastic deformation and the core 611 does not deform.

[0054] Among them, the microsphere particles 610 being subjected to an external force may include: external forces in various scenarios where the electronic device may be subjected to external forces during production and manufacturing and normal use. For example, the external force may be the extrusion force of the glue layer received by the electronic device during the folding process. Or, the external force may also be the impact force received during the ball-drop and pen-drop tests, etc.

[0055] It can be understood that in some embodiments of the present application, the above-mentioned outer shell 612 can be made of an elastic material. Therefore, when the microsphere particles 610 are subjected to an external force, the outer shell 612 can undergo elastic deformation. And the above-mentioned core 611 can be made of a hard material. Therefore, when the microsphere particles 610 are subjected to an external force, the core 611 hardly deforms. For example, in some embodiments of the present application, the material of the outer shell 612 can be polymethyl methacrylate (PMMA), and the material of the core 611 can be selected from hard silica, polystyrene (PS), or hard PMMA, etc.

[0056] In this embodiment, since the core 611 is not easily deformed when the microsphere particles 610 are subjected to an external force, when the folding screen device is subjected to an external force, the deformation amount of the microsphere particles 610 is small or there is no deformation, so as to support the folding screen device in the thickness direction, enabling the microsphere particles 610 to achieve the thickness support function and effectively alleviating the fatigue thinning of the adhesive layer. Correspondingly, since the outer shell 612 can undergo elastic deformation when the microsphere particles 610 are subjected to an external force, that is, the microsphere particles 610 have a certain resilience. In this way, during the folding process of the folding screen device, the outer shell 612 can be deformed due to being squeezed. Correspondingly, during the unfolding process of the folding screen device, the squeezing force acting on the outer shell 612 gradually disappears, and the outer shell 612 returns to the state before the elastic deformation under the action of its own elastic force. During this process, the outer shell 612 can assist the adhesive layer to return to the state before the elastic deformation, thereby effectively reducing the generation of creases.

[0057] Optionally, the mesh structure 600 is provided in the first adhesive layer 200. The microsphere particles 610 include a core 611 and an outer shell 612. The core 611 and the outer shell 612 are connected by chemical bonds, and the refractive index of the core 611, the refractive index of the outer shell 612, and the refractive index of the first adhesive layer 200 are equal.

[0058] Among them, the above-mentioned core components can be: materials such as SiO2, acrylic resin, etc. with a refractive index close to that of OCA. Correspondingly, the above-mentioned outer shell 612 components can be: materials such as acrylic resin, epoxy resin, etc. with a refractive index close to that of OCA.

[0059] Among them, the refractive index of the outer shell 612 can be regulated by selecting acrylic resins with different formulations. The refractive index of the core 611 can be regulated by the grain size and surface topography. For example, when the core 611 is made of SiO2, the refractive index of the core 611 can be regulated by the grain size and surface topography. When the core 611 is made of PS, the refractive index of the core 611 can be regulated by the molecular chain length and degree of polymerization. It should be noted that in the related art, microsphere particles 610 with different refractive indices can be directly purchased.

[0060] In this embodiment, by connecting the core 611 and the outer shell 612 through chemical bonds, the refractive index of the core 611, the refractive index of the outer shell 612, and the refractive index of the first adhesive layer 200 are equal. During the propagation of light between the adhesive layer and the microsphere particles 610, since the refractive indices of the various components in the adhesive layer are relatively fixed, the refraction angle of light can be controlled, that is, the optical path in the adhesive layer can be made controllable, which is beneficial to improving the display effect of the folding screen device.

[0061] Optionally, the microsphere particles 610 include a core 611 and an outer shell 612. The core 611 and the outer shell 612 are connected through chemical bonds, and the elastic modulus of the outer shell 612 ranges from 1 Mpa to 200 Mpa.

[0062] The above elastic modulus is a physical quantity that describes the ability of a material to resist deformation in the elastic deformation stage and is usually defined as the ratio of stress to strain.

[0063] In this embodiment, since the elastic modulus of the outer shell 612 ranges from 1 Mpa to 200 Mpa, the outer shell 612 can have the performance of impact recovery, and the impact compression recovery rate reaches more than 90%.

[0064] Optionally, the elastic modulus of the first adhesive layer 200 ranges from 20 kpa to 100 kpa; the elastic modulus of the second adhesive layer 400 ranges from 20 kpa to 100 kpa.

[0065] In this embodiment, by making the elastic modulus of the first adhesive layer 200 range from 20 kpa to 100 kpa; the elastic modulus of the second adhesive layer 400 ranges from 20 kpa to 100 kpa, during the process of the folding screen device switching between the folded state and the unfolded state, the first adhesive layer 200 and the second adhesive layer 400 can produce elastic deformation, avoiding the problem of crease generation caused by irreversible creep of the adhesive layer.

[0066] Optionally, the particle size of the microsphere particles 610 ranges from 0.2 times to 0.6 times the thickness of the adhesive layer where the microsphere particles 610 are located.

[0067] Among them, regarding the particle size selection of the microsphere particles 610: According to experimental data, the particle size of the microspheres should be 0.2 to 0.6 times the thickness of the glue layer where they are located. When the particle size of the microsphere particles 610 is less than 0.2 times the thickness of the glue layer where they are located, the haze of the folding screen device is obvious and the display effect is poor. When the particle size of the microsphere particles 610 is greater than 0.6 times the thickness of the glue layer where they are located, the distribution and impact resistance of the folding screen device are reduced. In addition, either microspheres within the range of 0.2 to 0.6 times can be added with different particle sizes into the glue material while meeting the addition amount, or microspheres with a fixed particle size can be added into the glue layer while meeting the addition amount, as Figure 1 shown. In the embodiment of the present application, the particle size of the microsphere particles 610 refers to the diameter of the microsphere particles 610.

[0068] The thickness of the above-mentioned first glue layer 200 and second glue layer 400 generally has a value range of 15um to 100um.

[0069] In this embodiment, by making the value range of the particle size of the microsphere particles 610 be: 0.2 times to 0.6 times the thickness of the glue layer where the microsphere particles 610 are located, in this way, the folding screen device can simultaneously have a good display effect and impact resistance.

[0070] Optionally, the plurality of microsphere particles 610 include first microsphere particles and second microsphere particles, wherein the particle size of the first microsphere particles is greater than that of the second microsphere particles, and the value range of the sum of the weights of all the second microsphere particles in the network structure 600 is: 0.25 times to 0.5 times the sum of the weights of all the first microsphere particles in the network structure 600;

[0071] The weight ratio of the plurality of microsphere particles 610 in the glue layer where they are located has a value range of 0.2% to 0.7%.

[0072] Among them, according to the experimental results, when there are too many microsphere particles 610 in the glue layer, it will affect the display effect of the folding screen device and cause the problem of "flash point". When there are too few microsphere particles 610 in the glue layer, the overall impact resistance of the folding screen device will be reduced and creases are likely to occur. In addition, the diameter of the microsphere particles 610 also directly affects the impact resistance and crease effect, and the length of the above-mentioned branched chain 620 is generally nanoscale or microscale.

[0073] In some embodiments of the present application, in an adhesive layer, the addition amount of the microsphere particles 610 is: 0.2 wt% to 0.7 wt%, where wt is the sum of the weights of the adhesive layer and the microsphere particles 610, that is, the value range of the weight ratio of the multiple microsphere particles 610 in the adhesive layer where they are located is 0.2% to 0.7%. When the weight ratio of the multiple microsphere particles 610 in the adhesive layer where they are located exceeds 0.7 wt%, the haze of the folding screen device is obvious and the display effect is poor. When the weight ratio of the multiple microsphere particles 610 in the adhesive layer where they are located is less than 0.2 wt%, the effects of shock resistance and crease reduction cannot be achieved. Among them, the composition of the microsphere particles 610 may include: SiO2, acrylic resin, PS, etc.

[0074] As Figure 5 and Figure 6 shown, for the folding screen device without added microspheres, after being bent, the bent area is compressed / misaligned and deformed. For the folding screen device with added microspheres, after being bent, due to the supporting effect of the microspheres and the compression recovery of the microspheres, the bent area bears less compression / misalignment, thereby reducing the crease effect.

[0075] The value range of the sum of the weights of all the second microsphere particles in the above-mentioned network structure 600 being 0.25 times to 0.5 times the sum of the weights of all the first microsphere particles in the network structure 600 may mean: in the network structure 600, wt2% = (1 / 4 to 1 / 2)wt1%, where wt1% is the weight ratio of the first microsphere particles in the adhesive layer where they are located, and correspondingly, wt2% is the weight ratio of the second microsphere particles in the adhesive layer where they are located. Since the multiple microsphere particles 610 include first microsphere particles and second microsphere particles with different particle sizes, in this way, in the adhesive layer, the small microsphere particles 610 can form a close-packed layer, and the large microsphere particles 610 are embedded in the interlayer gaps to form a layered stacked network sea-island structure.

[0076] In this embodiment, by making the value range of the weight ratio of the multiple microsphere particles 610 in the adhesive layer where they are located be 0.2% to 0.7%, in this way, the folding screen device can have both a good display effect and impact resistance. At the same time, by making the multiple microsphere particles 610 include first microsphere particles and second microsphere particles, where the particle size of the first microsphere particles is larger than that of the second microsphere particles, and the value range of the sum of the weights of all the second microsphere particles in the network structure 600 is 0.25 times to 0.5 times the sum of the weights of all the first microsphere particles in the network structure 600, it is beneficial for the multiple microsphere particles 610 to form a layered stacked network sea-island structure.

[0077] It should be noted that the folding screen device provided by the embodiments of the present application has at least the following beneficial effects:

[0078] In addition to improving creases, the impact resistance can also be enhanced, and the impact resistance is expected to be increased by at least more than 20%. The flexible microspheres with surface branches 620, after withstanding impact, change from disordered arrangement to topological arrangement, playing a good role in shock absorption and impact resistance.

[0079] Microsphere differences: In the embodiments of the present application, the microsphere particles 610 are core-shell structures with branches 620. The core-shell structure of the particles will not disappear, and the branches 620 will also be linked together through various chemical bond methods, which can improve the impact resistance effect. Crease improvement mechanism: ① The core-shell with a relatively high elastic modulus and high compression recovery, after being compressed and deformed, has a reversible elastic recovery of more than 95%, absorbs the bending and dislocation stress, and reduces the OCA creep; ② The branches 620 increase the linking force between the microspheres and the OCA, preventing the microspheres from failing due to bending and dislocation inside the OCA. In the embodiments of the present application, the particle size range of the microsphere particles 610 is 0.2 to 0.6 times the thickness of the OCA layer, belonging to the micron level.

[0080] Microsphere selection: In the embodiments of the present application, the microsphere particles 610 are required to have a refractive index close to that of the OCA optical glue, reducing the refraction / reflection of the light emitted from the display layer 300 in the OCA, ensuring the display effect, and avoiding multiple refractions and reflections of the light path of the display layer 300 in the OCA due to different refractive indices, which will greatly reduce the display effect and cause the "flash point" problem.

[0081] The embodiments of the present application also provide an electronic device, which includes a housing, a circuit board, and the folding screen device described in the above embodiments. The housing is fixedly connected to the folding screen device, and the circuit board is located between the housing and the folding screen device.

[0082] Among them, the electronic device can be various types of folding screen devices. For example, it can be an electronic consumer product such as a personal computer (PC), a tablet computer, a personal game console, a folding screen mobile phone, etc.

[0083] In this embodiment, since the electronic device includes the folding screen device described in the above embodiments, the electronic device can implement each process of the folding screen device in the above embodiments and has the same beneficial effects. To avoid repetition, it will not be elaborated here.

[0084] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all belong to the protection scope of the present application.

Claims

1. A folding screen device, characterized in that: include: A protective layer, a first adhesive layer, a display layer, a second adhesive layer and a support layer are stacked in sequence; Wherein, at least one of the first adhesive layer and the second adhesive layer has a mesh structure inside, and the mesh structure is a mesh structure formed by a plurality of microsphere particles linked by side chains; When the folding screen device is in a first stress state, the mesh structure is in a first connection state; When the folding screen device is in a second stress state, the mesh structure is in a second connection state, wherein the pressure applied to the folding screen device in the second stress state is greater than the pressure applied to the folding screen device in the first stress state, and the stress in the second connection state is greater than the stress in the first connection state.

2. The folding screen device according to claim 1, characterized in that: In the network structure, each microsphere particle is linked to at least one other microsphere particle through a branched chain.

3. The folding screen device according to claim 2, characterized in that: The branch chains are formed by the breaking of the circular branches in the adhesive layer after the microsphere particles with circular branches on the surface are mixed into the adhesive layer, and each circular branch chain forms at least two branches after breaking, and the branches on the surfaces of different microsphere particles can be linked to each other to form the network structure.

4. The folding screen device according to claim 1, characterized in that: The stress in the branch in the second connection state is greater than the stress in the branch in the first connection state.

5. The folding screen device according to claim 1, characterized in that: The branch chain and the adhesive layer where the branch chain is located are linked by chemical bonds; In the network structure, the side chains are linked to the linked microsphere particles through chemical bonds.

6. The folding screen device according to claim 1, characterized in that: The microsphere particles include a core and a shell. When the microsphere particles are subjected to an external force, the elastic deformation of the shell is greater than the elastic deformation of the core.

7. The folding screen device according to any one of claims 1 to 6, characterized in that: The first adhesive layer is provided with the mesh structure, the microsphere particles include a core and a shell, and the refractive index of the core, the refractive index of the shell and the refractive index of the first adhesive layer are in the same refractive index range.

8. The folding screen device according to claim 7, characterized in that: The elastic modulus of the shell ranges from 1 MPa to 200 MPa.

9. The folding screen device according to any one of claims 1 to 6, characterized in that: The elastic modulus of the first adhesive layer ranges from 20 kPa to 100 kPa; The elastic modulus of the second adhesive layer ranges from 20 kPa to 100 kPa.

10. The folding screen device according to any one of claims 1 to 6, characterized in that: The particle size of the microsphere particles ranges from 0.2 to 0.6 times the thickness of the adhesive layer where the microsphere particles are located.

11. The folding screen device according to claim 10, characterized in that: The plurality of microsphere particles include first microsphere particles and second microsphere particles, wherein the particle size of the first microsphere particles is larger than that of the second microsphere particles, and the sum of the weights of all the second microsphere particles in the network structure is in the range of 0.25 to 0.5 times the sum of the weights of all the first microsphere particles in the network structure; The weight ratio of the plurality of microsphere particles in the adhesive layer is in the range of 0.2% to 0.7%.

12. An electronic device, characterized in that: It comprises a shell, a circuit board and a folding screen device as described in any one of claims 1 to 11, wherein the shell is fixedly connected to the folding screen device, and the circuit board is located between the shell and the folding screen device.

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