Method for forming middle frame, display device manufacturing method, display device and printing device

Abstract

This invention relates to the field of display device manufacturing technology, specifically to a method for forming a mid-frame, a method for manufacturing a display device, a display device, and a printing apparatus. The method for forming the mid-frame of a display device includes: providing a display substrate, the display substrate including a back plate, a display module, and a cover plate; the display substrate including an edge region, the edge region comprising the edge of the back plate, the edge of the display module layer, and the edge of the cover plate, and a region extending from the edge towards the center of the display substrate; forming a mid-frame on a target area of ​​the display substrate surface using 3D printing, the mid-frame completely covering the edge region; the mid-frame including a hybrid functional layer, the hybrid functional layer being made of at least two or more of the following materials: waterproof material, electromagnetic shielding material, thermally conductive material, rigid material, and adhesive material. This invention can manufacture a mid-frame composed of a hybrid functional layer with multiple functions, and can meet multiple functional requirements with only a single functional layer.

Description

Technical Field

[0001] This invention relates to the field of display device manufacturing technology, and specifically to a method for forming a mid-frame, a method for manufacturing a display device, a display device, and a printing device. Background Technology

[0002] Display modules, as devices that provide image display capabilities, are widely used in various display devices. Traditional display module frames are prone to screen failure in electronic devices (such as mobile phones) due to external factors. Therefore, improving display devices to achieve narrow bezels and strong impact resistance, water resistance, thermal conductivity, electromagnetic interference resistance, and adhesion are urgent problems to be solved.

[0003] Currently, the mainstream approach to solving these problems is to separately manufacture corresponding functional layers and assemble or integrally mold them with the mid-frame. Examples include waterproof layers, reinforcing layers, and electromagnetic shielding layers. However, assembly methods suffer from tolerance issues, making it difficult for the additional functional layers to fit tightly with the mid-frame, resulting in less than ideal functionality. Furthermore, assembly solutions struggle to meet narrow bezel requirements. In contrast, integral injection molding can compress the display module, potentially causing micro-deformation and degrading display quality. Additionally, assembly or integral molding requires separate molds for different product models, leading to higher costs.

[0004] Therefore, a solution is needed to address the problems of unsatisfactory functional layer effect of the display device frame, difficulty in meeting the requirements of narrow bezels, easy deterioration of display effect, and high cost. Summary of the Invention

[0005] Therefore, in order to solve the problems of unsatisfactory functional layer effect of the display device frame, difficulty in meeting the requirements of narrow bezels, easy deterioration of display effect and high cost, the present invention provides a frame forming method, a display device manufacturing method, a display device and a printing device.

[0006] This invention provides a method for forming a mid-frame of a display device, comprising the following steps: providing a display substrate, the display substrate including a back plate, a display module layer, and a cover plate; the display substrate including an edge region, the edge region including the edge of the back plate, the edge of the display module layer, and the edge of the cover plate, and a region of the width of the back plate, the display module layer, and the cover plate from the edge to the center of the display substrate; forming a mid-frame on a target area on the surface of the display substrate using 3D printing, the mid-frame completely covering the edge region; the mid-frame including a hybrid functional layer, the material of the hybrid functional layer including at least two or more of waterproof material, electromagnetic shielding material, thermally conductive material, rigid material, and adhesive material.

[0007] Optionally, in the step of forming the middle frame, the print head of the 3D printing device is used to print the mixed material into the edge area, completely covering the edge area; the mixed material includes at least two or more of the following: waterproof material, electromagnetic shielding material, thermally conductive material, rigid material, and adhesive material.

[0008] Optionally, the mixed material is a mixture of two or more of the following: waterproof material, electromagnetic shielding material, thermally conductive material, rigid material, and adhesive material, which is then filled into the print head of the 3D printing device for printing.

[0009] Optionally, the 3D printing apparatus includes a first print head and a second print head; the first print head and the second print head use different printing adhesives respectively; the step of forming the middle frame further includes: using the first print head to print the first printing adhesive along the inner edge of the edge area to form an inner retaining wall; using the first print head to print the first printing adhesive along the outer edge of the edge area to form an outer retaining wall; using the second print head to print the second printing adhesive in the edge area to form a filling layer, the filling layer completely filling the space in the edge area jointly defined by the inner and outer retaining walls; wherein the second printing adhesive includes a mixed material, and the filling layer is a mixed functional layer.

[0010] Optionally, the edge of the display module layer is recessed inward relative to the edge of the back panel, and the edge of the cover plate is recessed inward relative to the edge of the back panel; an inner retaining wall is formed on the surface of the cover plate within the edge area; an outer retaining wall is formed on the surface of the back panel within the edge area; and a filling layer covers the side of the cover plate within the edge area and the side of the display module layer.

[0011] Optionally, the viscosity of the first printing adhesive is greater than that of the second printing adhesive; the first printing adhesive has shape retention properties, while the second printing adhesive has flowability.

[0012] Optionally, the 3D printing apparatus further includes a scanning unit and a path calculation unit; the step of forming the middle frame further includes: the scanning unit scanning the shape of the display substrate to obtain shape data; the path calculation unit calculating the printing paths of the first print head and the second print head based on the shape data; using the first print head to print along the inner edge of the edge area to form an inner retaining wall according to the calculated printing path; using the first print head to print along the outer edge of the edge area to form an outer retaining wall; using the second print head to print in the edge area according to the calculated printing path to form a filling layer, the filling layer filling the space in the edge area defined by the inner and outer retaining walls.

[0013] Optionally, in the step of forming the mid-frame, the 3D printing method includes direct-write printing, piezoelectric valve printing, striker valve printing, and inkjet printing. The mid-frame forming method for the display device provided by this invention can be applied to different printing methods.

[0014] The present invention also provides a method for manufacturing a display device, wherein the middle frame of the display device is formed by the method for forming the middle frame of the display device provided by the present invention.

[0015] The present invention also provides a display device, comprising: a display substrate, the display substrate including a back plate, a display module layer, and a cover plate; the display substrate including an edge region, the edge region including the edge of the back plate, the edge of the display module layer, and the edge of the cover plate, and a region of the width of the back plate, the display module layer, and the cover plate from the edge to the center of the display substrate; a middle frame, the middle frame completely covering the edge region; the middle frame including: an inner retaining wall located at the inner edge of the edge region; an outer retaining wall located at the outer edge of the edge region; and a filling layer completely filling the space within the edge region defined by the inner retaining wall and the outer retaining wall; wherein the filling layer is a hybrid functional layer comprising at least two or more single-layer structures of waterproof material, electromagnetic shielding material, thermally conductive material, rigid material, and adhesive material.

[0016] The present invention also provides a printing apparatus suitable for 3D printing a display substrate to form a mid-frame; the display substrate includes a back plate, a display module layer, and a cover plate stacked together; the display substrate includes an edge region, which includes the edge of the back plate, the edge of the display module layer, and the edge of the cover plate, and the area of ​​their width from the edge to the center of the display substrate; the printing apparatus includes: a printing unit; the printing unit includes at least one print head; a feeding unit; the feeding unit includes multiple hoppers, each hopper being suitable for containing a printing material; the feeding unit also includes a mixing hopper, which is connected to the multiple hoppers and the print head through a pipeline, and is suitable for mixing the materials from the multiple hoppers before inputting them into the print head.

[0017] Optionally, the mixing chamber includes a receiving chamber body, which is equipped with a stirring assembly and a heating assembly; the stirring assembly includes a rotating motor, a rotating shaft, and stirring blades; the heating assembly includes heating elements.

[0018] Optionally, the printing unit includes at least two printheads, one of which is connected to a mixing chamber, and the other printheads are individually connected to a material hopper one-to-one.

[0019] Optionally, the printing apparatus further includes: a stage adapted to support a display substrate; a scanning unit adapted to scan the shape of the display substrate to obtain height data at different locations in the edge area of ​​the display substrate; a support adapted to mount the printing unit and the scanning unit; a path calculation unit adapted to receive the data obtained by the scanning unit and calculate the printing path; and a driving unit adapted to drive the support to move according to the printing path provided by the path calculation unit, thereby moving the scanning unit and the printing unit. The beneficial effects of this invention are:

[0020] The method for forming the mid-frame of a display device provided by this invention uses 3D printing to directly form a functional layer of hybrid material, making the functional layer integrally formed with the mid-frame body. The mid-frame itself possesses the corresponding functions of the components in the hybrid material, allowing multiple functional requirements to be met with a single functional layer. This eliminates the need for additional, separately assembled functional layers, avoiding the problem of poor fit due to tolerance issues in assembled separate functional layers, which leads to suboptimal functional performance. Therefore, the corresponding functional effects can be well achieved. Since the functional layer and the mid-frame body are integrally formed by 3D printing, on the one hand, no additional assembly is required, which can well adapt to narrow bezel requirements; on the other hand, the 3D printing method does not cause deformation damage to the display module, and does not affect the display effect. In addition, 3D printing can directly adjust the printing scheme as needed, avoiding waste and eliminating the need to prepare separate molds for different models, resulting in lower costs.

[0021] Furthermore, the method for forming the middle frame of the display device provided by the present invention directly forms the middle frame of the hybrid functional layer by printing the hybrid material directly on the edge area to completely cover the edge area. This results in a high degree of close fit with the display module, which is conducive to the realization of functions. Moreover, the steps are simple and the production efficiency is high.

[0022] Furthermore, the method for forming the middle frame of the display device provided by the present invention premixes different materials before filling them into the print head, which results in a higher degree of uniformity of mixing compared to directly filling the print head. A preset mixing ratio can be configured in advance to ensure the realization of the corresponding functions.

[0023] Furthermore, the method for forming the middle frame of the display device provided in this embodiment prints the middle frame by first forming inner and outer retaining walls, and then forming a filling layer. This effectively limits the range of the middle frame while ensuring the functionality of the mixed layers, preventing it from overflowing beyond the edge area and affecting the display effect. The target area can be set to completely overlap with the edge area, ensuring that the final middle frame completely overlaps with the edge area. Moreover, by using different printing adhesives to form the retaining walls and filling layer separately, appropriate adhesives can be selected as needed, allowing the retaining walls and filling layer to have different adhesive properties during printing to meet different printing requirements.

[0024] In addition, this application also provides a display device forming method using the above-described mid-frame forming method, a correspondingly formed display device, and a printing device used in the forming method. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 A top view schematic diagram of a mid-frame formed by a method for forming a mid-frame of a display device;

[0027] Figure 2 A schematic diagram of the cross-sectional structure of a mid-frame formed by a method for forming a mid-frame of a display device;

[0028] Figure 3 This is a schematic cross-sectional view of the middle frame formed by a middle frame forming method of a display device according to an embodiment of the present invention;

[0029] Figure 4 This is a top view schematic diagram of a mid-frame formed by a mid-frame forming method of a display device according to an embodiment of the present invention;

[0030] Figure 5 for Figure 4 A partial structural diagram of the middle frame and display substrate in an embodiment;

[0031] Figure 6 This is a schematic diagram of the print head and some related structures of a printing device according to an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the overall structure of a printing device according to an embodiment of the present invention.

[0033] 100 - Display substrate; 110 - Back plate; 130 - Cover plate; 200 - Middle frame; 201 - First functional layer; 202 - Second functional layer; 20n - Nth functional layer; 211 - Inner retaining wall; 212 - Outer retaining wall; 220 - Filling layer; 22X - Mixing functional layer; 310 - Platform; 320 - Support; 330 - Print head; 331 - First print head; 332 - Second print head; 340 - Material bin; 350 - Mixing bin; A - Display substrate. Detailed Implementation

[0034] refer to Figure 1 A method for forming the middle frame of a display device, the state of the middle frame after formation is as follows: Figure 1 As shown, it includes a display substrate 100 and a mid-frame 200. The display substrate includes a back panel, a display module layer, and a cover plate stacked together. When various functions such as waterproofing and electromagnetic shielding are required, the mid-frame formed in this way typically needs additional functional layers assembled with the mid-frame body or integrally injection molded to form a multi-layered frame structure. (See reference...) Figure 2 The display, for example, shows a frame with layers inside, including a first functional layer 201, a second functional layer 202, and so on up to an nth functional layer 20n, where n ≥ 3. These layers are for waterproofing, electromagnetic shielding, etc. To achieve the functions of each layer, the dimensions of each layer in this structure must be guaranteed to a certain extent, resulting in a relatively large frame that is difficult to adapt to narrow bezels. Furthermore, the assembly method is prone to poor fit with the display substrate 100 due to tolerance issues, leading to suboptimal functionality of the functional layers. If a one-piece injection molding method is used, it can easily cause slight deformation of the display module within the display substrate 100, affecting the display effect. In addition, both methods require separate molds for display substrates of different sizes, resulting in some waste and higher costs.

[0035] Therefore, the present invention provides a method for forming a display device frame, a method for manufacturing a display device, and a printing apparatus, which solves the problems of unsatisfactory functional layer effect of the display device frame, difficulty in meeting the requirements of narrow bezels, easy deterioration of display effect, and high cost.

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Example 1

[0041] refer to Figure 3 and Figure 1 This embodiment provides a method for forming the middle frame of a display device, including the following steps:

[0042] A display substrate 100 is provided, the display substrate including a back plate, a display module layer and a cover plate; the display substrate includes an edge region, the edge region including the edge of the back plate, the edge of the display module layer and the edge of the cover plate, and a region of the back plate, the display module layer and the cover plate from the edge to the center of the display substrate;

[0043] Using 3D printing, a middle frame 200 is formed in a target area on the surface of the display substrate 100, and the middle frame 200 completely covers the edge area; the middle frame 200 includes a hybrid functional layer 22X, and the material of the hybrid functional layer 22X includes at least two or more of the following: waterproof material, electromagnetic shielding material, thermally conductive material, rigid material and adhesive material.

[0044] The target area refers to the area where the middle frame 200 is to be formed. In this embodiment, the target area at least completely covers the edge area.

[0045] Specifically, such as Figure 3 As shown, the hybrid functional layer 22X is a complete single-layer structure formed by printing hybrid materials, rather than a superposition of multiple layers.

[0046] The method for forming the mid-frame of the display device provided in this embodiment uses 3D printing to directly form a functional layer of mixed materials, specifically a hybrid functional layer 22X. This allows the functional layer to be integrally formed with the mid-frame body. The mid-frame 200 itself possesses the corresponding functions of the components in the hybrid material. Multiple functional requirements can be met with a single functional layer, eliminating the need for additional, separately assembled functional layers. This avoids the problem of poor fit due to tolerance issues in assembled functional layers, which can lead to suboptimal functional performance. Therefore, the corresponding functional effects can be achieved effectively. Since the functional layer and the mid-frame body are integrally formed by 3D printing, on the one hand, no additional assembly is required, which can well adapt to narrow bezel requirements; on the other hand, 3D printing does not cause deformation damage to the display module and does not affect the display effect. Furthermore, 3D printing can directly adjust the printing scheme as needed, avoiding waste and eliminating the need for separate molds for different models, resulting in lower costs.

[0047] Furthermore, in the step of forming the middle frame, the print head of the 3D printing device is used to print the mixed material into the edge area, completely covering the edge area; the mixed material includes at least two or more of the following: waterproof material, electromagnetic shielding material, thermally conductive material, rigid material, and adhesive material.

[0048] The method for forming the middle frame of the display device provided in this embodiment directly forms the middle frame of the hybrid functional layer by printing the hybrid material directly on the edge area, completely covering the edge area. This results in a high degree of tightness with the display module, which is conducive to the realization of functions. Moreover, the steps are simple and the production efficiency is high.

[0049] Furthermore, the hybrid material is a mixture of two or more of the following: waterproof material, electromagnetic shielding material, thermally conductive material, rigid material, and adhesive material, which is then filled into the print head of the 3D printing device for printing.

[0050] The method for forming the middle frame of the display device provided in this embodiment involves pre-mixing different materials before filling them into the print head. Compared with directly filling the print head, this method achieves a higher degree of uniformity in mixing and allows for the pre-configuration of a preset mixing ratio to ensure the realization of the corresponding functions.

[0051] Further reference Figure 4 and Figure 5 The 3D printing apparatus includes a first print head and a second print head; the first print head and the second print head use different printing adhesives respectively; the step of forming the middle frame further includes: using the first print head to print the first printing adhesive along the inner edge of the edge area to form an inner barrier 211; using the first print head to print the first printing adhesive along the outer edge of the edge area to form an outer barrier 212; using the second print head to print the second printing adhesive in the edge area to form a fill layer 220, the fill layer 220 completely filling the space in the edge area jointly defined by the inner barrier 211 and the outer barrier 212; wherein the second printing adhesive includes a mixed material, and the fill layer 220 is a mixed functional layer 22X.

[0052] The method for forming the middle frame of the display device provided in this embodiment prints the middle frame 200 by first forming an inner barrier 211 and an outer barrier 212, and then forming a filling layer. This method effectively limits the range of the middle frame while ensuring the hybrid functional layer 22X is maintained, preventing it from overflowing beyond the edge area and affecting the display effect. The target area can be set to completely overlap with the edge area, ensuring that the final middle frame 200 completely overlaps with the edge area. Furthermore, by using different printing adhesives to form the barrier and filling layer 220, appropriate adhesives can be selected as needed, allowing the barrier and filling layer to have different adhesive properties during printing to meet different printing requirements.

[0053] Specifically, the viscosity of the first printing adhesive is greater than that of the second printing adhesive; the first printing adhesive has shape retention properties, while the second printing adhesive has fluidity.

[0054] The method for forming the middle frame of the display device provided in this embodiment ensures rapid forming of the inner and outer retaining walls by limiting the viscosity of the first printing adhesive to be greater than that of the second printing adhesive, while also making the filling layer easy to flow and fill the space to form a flat middle frame surface.

[0055] Specifically, the viscosity of the first adhesive is 1,000,000 cps to 2,000,000 cps; the viscosity of the second adhesive is 20 cps to 500 cps.

[0056] The method for forming the middle frame of the display device provided by this invention has the following issues: If the viscosity of the first adhesive exceeds 2,000,000 cps, it will cause difficulties in adhesive dispensing and material breakage; if the viscosity of the first adhesive is below 1,000,000 cps, the printed anti-overflow wall will easily have insufficient rigidity and poor shape retention. Therefore, a viscosity range of 1,000,000 cps to 2,000,000 cps for the first adhesive can achieve a balance between avoiding dispensing difficulties and ensuring the rigidity of the anti-overflow wall. If the viscosity of the second adhesive exceeds 500 cps, it will easily lead to slow or uneven leveling of the filler layer; if the viscosity of the second adhesive is below 20 cps, it will easily lead to uncontrolled dripping or material hanging from the needle, affecting the morphology of the display substrate. A viscosity range of 20 cps to 500 cps for the second adhesive can achieve a balance between ensuring smooth leveling of the filler layer and avoiding free dripping.

[0057] Further reference Figure 5 In some embodiments, the edge of the display module layer (the layer between the back plate 110 and the cover plate 130 in the figure) is recessed inward relative to the edge of the back plate 110, and the edge of the cover plate 130 is recessed inward relative to the edge of the back plate 110; an inner baffle 211 is formed on the surface of the cover plate 130 in the edge region; an outer baffle 212 is formed on the surface of the back plate 110 in the edge region; and a filling layer 220 covers the side of the cover plate 130 in the edge region and the side of the display module layer.

[0058] The method for forming the mid-frame of the display device provided by the present invention reserves space for the filling of the bezel by indenting the display module layer and the cover plate. This allows the bezel area of ​​the final display device product to be maintained within the edge area, resulting in a smaller size (otherwise, a thicker assembly bezel would need to be added). This reduces the volume of the final display device product, making the product thinner and lighter, and the reduced bezel ratio leads to a better visual effect.

[0059] Furthermore, the 3D printing device also includes a scanning unit and a path calculation unit; the step of forming the middle frame further includes: the scanning unit scanning the shape of the display substrate to obtain shape data; the path calculation unit calculating the printing paths of the first print head and the second print head based on the shape data; using the first print head to print along the inner edge of the edge area to form an inner retaining wall 211 according to the calculated printing path; using the first print head to print along the outer edge of the edge area to form an outer retaining wall 212; using the second print head to print in the edge area according to the calculated printing path to form a filling layer 220, the filling layer 220 filling the space in the edge area jointly defined by the inner retaining wall 211 and the outer retaining wall 212.

[0060] The method for forming the middle frame of the display device provided in this embodiment obtains the shape data of the display substrate 100 through a scanning unit, calculates the corresponding printing path through a path calculation unit, and guides the print head to print the corresponding structure, which can ensure the forming accuracy of the middle frame.

[0061] In a specific implementation process: First, the 3D scanning unit scans the overall shape of the display substrate. Then, the printing parameters are set according to the specifications of the display substrate to be printed. Finally, the path calculation unit calculates the printing paths of the inner and outer retaining walls and the filling layer based on the scanned shape and the specifications of the display substrate, and the printing is then completed.

[0062] Furthermore, the method for forming the mid-frame of the display device provided in this embodiment can be applied to different printing methods. The 3D printing methods used in forming the mid-frame include direct-write printing, piezoelectric valve printing, striker valve printing, and inkjet printing.

[0063] Example 2

[0064] This embodiment provides a method for manufacturing a display device, wherein the middle frame of the display device is formed by the method for forming the middle frame of the display device provided in Embodiment 1 above.

[0065] The display device manufacturing method provided in this embodiment uses the display device mid-frame forming method provided by the present invention to form the mid-frame. By using 3D printing to directly form a hybrid functional layer from the hybrid material, the functional layer is integrally formed with the mid-frame body. The mid-frame itself possesses the corresponding functions of the components in the hybrid material, eliminating the need for additionally fabricated and assembled separate functional layers. This avoids the problem of poor fit due to tolerance issues in assembled separate functional layers, leading to suboptimal functional performance. Therefore, the corresponding functional effects can be well achieved. Since the functional layer and the mid-frame body are integrally formed by 3D printing, on the one hand, no additional assembly is required, which can well adapt to narrow bezel requirements; on the other hand, 3D printing does not cause deformation damage to the display module and does not affect the display effect. Furthermore, 3D printing can directly adjust the printing scheme as needed, avoiding waste and eliminating the need for separate molds for different models, resulting in lower costs.

[0066] Example 3

[0067] This embodiment provides a display device formed by the manufacturing method of Embodiment 2 described above, comprising:

[0068] The display substrate includes a back plate, a display module layer, and a cover plate; the display substrate includes an edge region, which includes the edge of the back plate, the edge of the display module layer, and the edge of the cover plate, as well as the area of ​​the back plate, the display module layer, and the cover plate extending from the edge to the center of the display substrate.

[0069] A middle frame, which completely covers the edge area; the middle frame includes:

[0070] An inner retaining wall is located at the inner edge of the edge region;

[0071] The outer retaining wall is located at the outer edge of the edge area;

[0072] A filling layer that completely fills the space within the edge area defined by the inner retaining wall and the outer retaining wall;

[0073] The filling layer is a hybrid functional layer comprising at least two or more single-layer structures selected from waterproof materials, electromagnetic shielding materials, thermally conductive materials, rigid materials, and adhesive materials.

[0074] The display device provided in this embodiment has a mid-frame filling layer that is a single-layer hybrid functional layer of mixed materials. This allows the functional layer to be integrally formed with the mid-frame body. The mid-frame itself possesses the corresponding functions of the components in the mixed materials, eliminating the need for additionally fabricated and assembled separate functional layers. This avoids the problem of poor fit due to tolerance issues in assembled separate functional layers, which could lead to suboptimal functional performance. Therefore, the corresponding functional effects can be achieved effectively. Since the functional layer and the mid-frame body are 3D printed as a single unit, on the one hand, no additional assembly is required, which can well adapt to narrow bezel requirements; on the other hand, the 3D printing method will not cause deformation damage to the display module, thus not affecting the display effect. Furthermore, 3D printing can directly adjust the printing scheme as needed, avoiding waste and eliminating the need to prepare separate molds for different models, resulting in lower costs.

[0075] Example 4

[0076] This embodiment provides a printing device suitable for 3D printing a display substrate to form a middle frame.

[0077] The display substrate includes a back plate, a display module layer, and a cover plate stacked together; the display substrate includes an edge region, which includes the edge of the back plate, the edge of the display module layer, and the edge of the cover plate, as well as the area of ​​their width from the edge to the center of the display substrate.

[0078] refer to Figure 6 The printing device includes:

[0079] Printing unit; the printing unit includes at least one print head 330;

[0080] The feeding unit includes multiple hoppers 340, each hopper 340 being adapted to hold a type of printing material; the feeding unit also includes a mixing hopper 350, which is connected to the multiple hoppers 340 and the print head 330 via pipes, and is adapted to mix the materials fed from the multiple hoppers 340 before feeding them into the print head 330.

[0081] The printing device provided in this embodiment contains a type of printing material in multiple hoppers 340, which are then mixed in a mixing hopper 350 before being input into the print head for printing. Different functional materials can be mixed in the mixing hopper 350 according to a preset ratio to ensure uniform mixing. The mixed material is then input into the print head 330, which directly outputs the printing material. This ensures that the resulting mixed functional layer 22X has a uniform material distribution and can directly form a mixed functional layer 22X of multiple materials. This allows each material to perform its corresponding function in different parts of the frame, and the functionality is consistent.

[0082] Furthermore, the mixing chamber 350 includes a receiving chamber body, which is equipped with a stirring assembly and a heating assembly; the stirring assembly includes a rotating motor, a rotating shaft, and stirring blades; the heating assembly includes heating elements.

[0083] The printing device provided in this embodiment uses a mixing assembly consisting of a rotating motor, a rotating shaft, and stirring blades to stir materials in a mixing chamber 350, ensuring uniform mixing of various materials. A heating element heats the mixing chamber 350 to maintain material flowability and ensure uniform mixing of multiple materials.

[0084] Furthermore, in some embodiments, the printing unit includes at least two printheads 330, one of which is connected to a mixing chamber, and the other printheads are individually connected one-to-one to a material hopper.

[0085] For example, such as Figure 7 As shown, the printhead includes a first printhead 331 and a second printhead 332. The second printhead 332 is connected to a mixing chamber 350 (hidden in the figure) via a conduit. The first printhead 331 is individually connected to each of the other material chambers 340 that are not connected to the mixing chamber 350. This allows the first printhead 331 and 332 to use different printing adhesives for printing.

[0086] The printing device provided in this embodiment has at least two print heads. One print head is used to print mixed materials to form a mixed functional layer. The others are individually connected to different material bins one-to-one. Different printing materials can be used to form different structures such as inner retaining walls and outer retaining walls. Different printing materials are filled according to different structural requirements.

[0087] Furthermore, the printing device also includes:

[0088] Stage 310 is suitable for supporting display substrate A;

[0089] The scanning unit (not shown in the figure) is adapted to scan the shape of the display substrate A to obtain height data at different locations in the edge area of ​​the display substrate;

[0090] The bracket 320 is suitable for mounting the printing unit and the scanning unit;

[0091] The path calculation unit (not shown in the figure) is adapted to receive the data acquired by the scanning unit and calculate the printing route;

[0092] The drive unit (not shown in the figure) is adapted to drive the support to move according to the printing route provided by the path calculation unit, so as to drive the scanning unit and the printing unit to move.

[0093] The printing device provided by the present invention provides basic functional support for the printing device through a stage 310, a support 320, a path calculation unit, and a drive unit.

[0094] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for forming the middle frame of a display device, characterized in that, Includes the following steps: A display substrate is provided, the display substrate including a back plate, a display module layer and a cover plate; the display substrate includes an edge region, the edge region including the edge of the back plate, the edge of the display module layer and the edge of the cover plate, and a region of the back plate, the display module layer and the cover plate from the edge to the center of the display substrate; Using 3D printing, a mid-frame is formed in a target area on the surface of the display substrate, the mid-frame completely covering the edge area; the mid-frame includes a hybrid functional layer, the material of which includes at least two or more of the following: waterproof material, electromagnetic shielding material, thermally conductive material, rigid material, and adhesive material; In the step of forming the middle frame, the print head of the 3D printing device is used to print the mixed material into the edge area, completely covering the edge area; the mixed material includes at least two or more of the following: waterproof material, electromagnetic shielding material, thermally conductive material, rigid material, and adhesive material.

2. The method for forming the middle frame of the display device according to claim 1, characterized in that, The mixed material is a mixture of two or more of the waterproof material, the electromagnetic shielding material, the thermally conductive material, the rigid material, and the adhesive material, which is then filled into the print head of the 3D printing device for printing.

3. The method for forming the middle frame of the display device according to claim 2, characterized in that, The 3D printing device includes a first print head and a second print head; the first print head and the second print head use different printing adhesives respectively; The step of forming the middle frame further includes: The first printhead is used to print the first printing adhesive along the inner edge of the edge area to form an inner retaining wall; The first printhead is used to print the first printing adhesive along the outer edge of the edge area to form an outer retaining wall; A second printhead is used to print a second printing adhesive in the edge area to form a filling layer, which completely fills the space in the edge area defined by the inner and outer retaining walls. The second printing adhesive includes the mixed material, and the filler layer is the mixed functional layer.

4. The method for forming the middle frame of the display device according to claim 3, characterized in that, The edge of the display module layer is recessed inward relative to the edge of the back plate, and the edge of the cover plate is recessed inward relative to the edge of the back plate; The inner retaining wall is formed on the surface of the cover plate within the edge area; the outer retaining wall is formed on the surface of the back plate within the edge area; The filling layer covers the side of the cover plate and the side of the display module layer within the edge area.

5. The method for forming the middle frame of the display device according to claim 3, characterized in that, The viscosity of the first printing adhesive is greater than that of the second printing adhesive; the first printing adhesive has shape retention properties, while the second printing adhesive has fluidity.

6. The method for forming the middle frame of the display device according to claim 3, characterized in that, The 3D printing device also includes a scanning unit and a path calculation unit; The step of forming the middle frame further includes: The scanning unit scans the shape of the display substrate to obtain shape data; The path calculation unit calculates the printing paths of the first print head and the second print head based on the shape data; Using the first print head, an inner retaining wall is formed by printing along the inner edge of the edge area according to the calculated printing path; the outer retaining wall is formed by printing along the outer edge of the edge area using the first print head. Using the second printhead, a filling layer is printed in the edge area according to the calculated printing path, the filling layer filling the space in the edge area defined by the inner retaining wall and the outer retaining wall.

7. The method for forming the middle frame of the display device according to claim 1, characterized in that, In the step of forming the middle frame, the 3D printing method includes direct writing printing, piezoelectric valve printing, impactor valve printing, and inkjet printing.

8. A method for manufacturing a display device, characterized in that, The mid-frame of the display device is formed by the mid-frame forming method of the display device as described in any one of claims 1-7.

9. A display device, characterized in that, include: The display substrate includes a back plate, a display module layer, and a cover plate; the display substrate includes an edge region, which includes the edge of the back plate, the edge of the display module layer, and the edge of the cover plate, as well as the area of ​​the back plate, the display module layer, and the cover plate extending from the edge to the center of the display substrate. A middle frame, which completely covers the edge area; the middle frame includes: An inner retaining wall is located at the inner edge of the edge region; The outer retaining wall is located at the outer edge of the edge area; A filling layer that completely fills the space within the edge area defined by the inner retaining wall and the outer retaining wall; The filling layer is a hybrid functional layer comprising at least two or more single-layer structures selected from waterproof materials, electromagnetic shielding materials, thermally conductive materials, rigid materials, and adhesive materials.

10. A printing apparatus, adapted to 3D print a display substrate to form a mid-frame using the mid-frame forming method of any one of claims 1-7; the display substrate includes a back plate, a display module layer, and a cover plate stacked together; the display substrate includes an edge region, the edge region being an area including the edge of the back plate, the edge of the display module layer, and the edge of the cover plate, and a region extending from the edge to the center of the display substrate. Its features are, The printing device includes: Printing unit; the printing unit includes at least one print head; The feeding unit includes multiple hoppers, each hopper being suitable for containing a type of printing material; the feeding unit also includes a mixing hopper, which is connected to the multiple hoppers and the print head via pipelines, and is suitable for mixing the materials from the multiple hoppers before inputting them into the print head; The printing device is adapted to mix different functional materials in a mixing chamber according to a preset ratio during the printing process of the middle frame, so as to directly form a mixed functional layer of multiple materials.

11. The printing apparatus according to claim 10, characterized in that, The mixing chamber includes a receiving chamber body, and the receiving chamber body is equipped with a stirring component and a heating component; The stirring assembly includes a rotating motor, a rotating shaft, and stirring blades; The heating assembly includes an electric heating element.

12. The printing apparatus according to claim 10, characterized in that, The printing unit includes at least two printheads, one of which is connected to the mixing chamber, and the other printheads are individually connected to one of the material hoppers.

13. The printing apparatus according to claim 10, characterized in that, Also includes: A platform, adapted to support the display substrate; A scanning unit is adapted to scan the shape of the display substrate to obtain height data at different locations in the edge region of the display substrate. A bracket suitable for mounting the printing unit and the scanning unit; A path calculation unit is adapted to receive data acquired by the scanning unit and calculate the printing route. The driving unit is adapted to drive the support to move according to the printing route provided by the path calculation unit, so as to drive the scanning unit and the printing unit to move.

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