Middle frame forming method, display device manufacturing method, display device and printing device

Abstract

The invention relates to the technical field of display device manufacturing, in particular to a middle frame forming method, a display device manufacturing method, a display device and a printing device. The middle frame forming method of the display device comprises the following steps: providing a display substrate, wherein the display substrate comprises a back plate, a display module and a cover plate; the display base body comprises an edge area, and the edge area comprises the edge of the back plate, the edge of the display module layer, the edge of the cover plate and areas with the width from the edges to the central part of the display base body; a middle frame is formed in the target area of the surface of the display base body in a 3D printing mode, and the middle frame completely covers the edge area; the middle frame comprises a mixed functional layer, and materials of the mixed functional layer at least comprise two or more of a waterproof material, an electromagnetic shielding material, a heat conduction material, a rigid material and an adhesive material. According to the manufacturing method, the middle frame formed by the mixed functional layer with multiple functions can be manufactured, and multiple functional requirements can be met only through the single functional layer.

Description

Technical Field

[0001] The present invention relates to the technical field of display device manufacturing, and in particular to a middle frame forming method, a display device manufacturing method, a display device and a printing device. Background Art

[0002] As a device that can provide image display function, display module is widely used in various display devices. The traditional display module middle frame can easily cause the screen of the electronic device (such as mobile phone, etc.) equipped with the traditional display module middle frame to fail due to some external factors. Therefore, how to improve the display device to have narrow frame and strong impact resistance, waterproofness, thermal conductivity, anti-electromagnetic interference and adhesion is an urgent problem to be solved.

[0003] At present, the mainstream method to solve the above problems is to prepare the corresponding functional layers separately and assemble or integrate them with the middle frame, such as assembling or integrating the waterproof layer, reinforcement layer, electromagnetic shielding layer, etc. with the middle frame. Due to tolerance problems, the assembly method makes it difficult for the additional functional layer to fit tightly with the middle frame, and the corresponding function is not ideal. In addition, the assembly solution is difficult to meet the requirements of narrow bezels. The one-piece injection molding solution will squeeze the display module, which may easily cause micro-deformation of the display module, resulting in poor display effect. In addition, the assembly or one-piece molding method requires separate molds for different models of products, which is costly.

[0004] Therefore, a solution is needed to solve the problems that the functional layer effect of the frame in the display device is not ideal, it is difficult to meet the narrow frame requirement, it is easy to cause the display effect to deteriorate and the cost is high. Summary of the invention

[0005] Therefore, in order to solve the problems that the functional layer effect of the middle frame of the display device is not ideal, it is difficult to meet the narrow frame requirement, and it is easy to cause poor display effect and high cost, the present invention provides a middle frame forming method, a display device manufacturing method, a display device and a printing device.

[0006] The present invention provides a method for forming a middle frame of a display device, comprising the following steps: providing a display substrate, the display substrate comprising a back plate, a display module layer and a cover plate; the display substrate comprising an edge area, the edge area comprising an edge of the back plate, an edge of the display module layer and an edge of the cover plate, and an area from the edge to the central part of the display substrate in width of the back plate, the display module layer and the cover plate; forming a middle frame in a target area on the surface of the display substrate by 3D printing, the middle frame completely covering the edge area; the middle frame comprising a hybrid functional layer, the material of the hybrid functional layer comprising at least two or more of a waterproof material, an electromagnetic shielding material, a thermal conductive material, a rigid material and an adhesive material.

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

[0008] Optionally, the mixed material is prepared by pre-mixing two or more of a waterproof material, an electromagnetic shielding material, a thermally conductive material, a rigid material and an adhesive material, and then filling the mixture into a print head of a 3D printing device for printing.

[0009] Optionally, 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 glues respectively; the step of forming the middle frame also includes: using the first print head to print the first printing glue along the inner edge of the edge area to form an inner retaining wall; using the first print head to print the first printing glue along the outer edge of the edge area to form an outer retaining wall; using the second print head to print the second printing glue in the edge area to form a filling layer, and the filling layer completely fills the space in the edge area jointly defined by the inner retaining wall and the outer retaining wall; wherein the second printing glue includes a mixed material, and the filling layer is a mixed functional layer.

[0010] Optionally, the edge of the display module layer is indented inward compared to the edge of the back plate, and the edge of the cover plate is indented inward compared to the edge of the back plate; the inner retaining wall is formed on the surface of the cover plate in the edge area; the outer retaining wall is formed on the surface of the back plate in the edge area; and the filling layer covers the side of the cover plate in the edge area and the side of the display module layer.

[0011] Optionally, the viscosity of the first printing glue is greater than the viscosity of the second printing glue; the first printing glue is shape-preserving, and the second printing glue is fluid.

[0012] Optionally, the 3D printing device also includes a scanning unit and a path calculation unit; the step of forming the middle frame also 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 according to the shape data; uses the first print head to print along the inner edge of the edge area according to the calculated printing path to form an inner retaining wall; uses the first print head to print along the outer edge of the edge area to form an outer retaining wall; uses the second print head to print in the edge area according to the calculated printing path to form a filling layer, and the filling layer fills the space in the edge area jointly defined by the inner retaining wall and the outer retaining wall.

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

[0014] The present invention also provides a method for manufacturing a display device, wherein a middle frame of the display device is formed by the method for forming a 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 comprising a back plate, a display module layer and a cover plate; the display substrate comprising an edge area, the edge area 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 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 area; the middle frame comprising: an inner retaining wall, located at the inner edge of the edge area; an outer retaining wall, located at the outer edge of the edge area; a filling layer, completely filling the space in the edge area jointly defined by the inner retaining wall and the outer retaining wall; wherein the filling layer is a mixed functional layer of a single-layer structure including at least two or more of waterproof material, electromagnetic shielding material, thermal conductive material, rigid material and adhesive material.

[0016] The present invention also provides a printing device, which is suitable for 3D printing a display substrate to form a middle frame; the display substrate includes a back plate, a display module layer, and a cover plate that are stacked; the display substrate includes an edge area, and the edge area includes the edge of the back plate, the edge of the display module layer and the edge of the cover plate, and the area from the edge to the width of the central part of the display substrate; the printing device includes: a printing unit; the printing unit includes at least one print head; a feeding unit; the feeding unit includes multiple silos, each silo is suitable for accommodating a printing material; the feeding unit also includes a mixing silo, which is connected to multiple silos and the print head through a pipeline, and is suitable for mixing the feeds of multiple silos and then inputting them into the print head.

[0017] Optionally, the mixing bin includes a containing bin body, which is provided with a stirring assembly and a heating assembly; the stirring assembly includes a rotating motor, a rotating shaft and stirring blades; and the heating assembly includes an electric heating plate.

[0018] Optionally, the printing unit includes at least two print heads, one of which is connected to the mixing bin, and the other print heads are individually connected to a bin one-to-one.

[0019] Optionally, the printing device further includes: a carrier, suitable for carrying a display substrate; a scanning unit, suitable for scanning the shape of the display substrate to obtain height data at different positions in the edge area of ​​the display substrate; a bracket, suitable for installing the printing unit and the scanning unit; a path calculation unit, suitable for receiving data obtained by the scanning unit and calculating a printing route; and a driving unit, suitable for driving the bracket 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. The beneficial effects of the present invention are:

[0020] The method for forming the middle frame of the display device provided by the present invention directly forms a functional layer of a mixed material by printing a mixed functional layer by 3D printing, so that the functional layer is formed integrally with the middle frame body, and the middle frame itself has the corresponding functions of the corresponding components in the mixed material, and can meet multiple functional requirements only through a single functional layer, without the need to make and assemble a separate functional layer to increase the function, thereby avoiding the problem that the assembled separate functional layer is difficult to assemble tightly due to tolerance problems, thereby causing the function to be unsatisfactory, and thus the corresponding functional effect can be well achieved; since the functional layer and the middle frame body are integrally formed by 3D printing, on the one hand, no additional assembly is required, and it can well adapt to the narrow frame requirements; on the other hand, the 3D printing method will not cause deformation damage to the display module, and will not affect the display effect. In addition, 3D printing directly adjusts the printing scheme according to needs for printing, avoiding waste, and there is no need to prepare separate molds for different models, and the cost is low.

[0021] Furthermore, the method for forming a middle frame of a display device provided by the present invention directly forms a middle frame of a mixed functional layer by printing the mixed material directly on the edge area to completely cover the edge area, which has a high degree of tight fit with the display module and is conducive to the realization of the function; 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 and then charges them into the print head. Compared with directly charging them into the print head, the mixing uniformity is higher and a preset mixing ratio can be preconfigured to ensure the realization of 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 the inner retaining wall and the outer retaining wall, and then forming the filling layer. On the basis of ensuring the mixed functional layer, the range of the middle frame can be well limited, and it will not overflow beyond the edge area to affect the display effect. The target area can be set to completely overlap with the edge area, so that the finally formed middle frame completely overlaps with the edge area. And by using different printing glues to form the retaining wall and the filling layer respectively, the appropriate glue can be selected as needed, so that the retaining wall and the filling layer have different glue properties when printing to meet different printing requirements.

[0024] In addition, the present application also provides a display device forming method using the above-mentioned middle frame forming method, a correspondingly formed display device, and a printing device used in the forming method. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

[0028] Figure 3 A schematic diagram of a cross-sectional structure of a middle frame formed by a method for forming a middle frame of a display device according to an embodiment of the present invention;

[0029] Figure 4 A schematic top view of a middle frame formed by a method for forming a middle frame of a display device according to an embodiment of the present invention;

[0030] Figure 5 for Figure 4 A schematic diagram of the partial structure of the middle frame and the display base of an embodiment;

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

[0032] Figure 7 The figure 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-carrier; 320-bracket; 330-print head; 331-first print head; 332-second print head; 340-silo; 350-mixing silo; A-display substrate. DETAILED DESCRIPTION

[0034] refer to Figure 1 A method for forming a middle frame of a display device. The state after forming the middle frame is as follows Figure 1 As shown. It includes a display base 100 and a middle frame 200. The display base includes a back plate, a display module layer and a cover plate that are stacked. When the middle frame formed in this way needs various functions such as a waterproof layer, an electromagnetic shielding layer, etc., it is usually necessary to assemble or integrally inject an additional functional layer with the middle frame body to form a multi-layer frame structure. Figure 2 For example, the inner side of the frame is layered with a first functional layer 201, a second functional layer 202, and the nth functional layer 20n, where n≥3, respectively representing a waterproof layer, an electromagnetic shielding layer, and the like. In order to realize the corresponding functions of each layer, the size of each layer of the middle frame formed in this way needs to be guaranteed to a certain extent, resulting in a large middle frame structure that is difficult to adapt to the needs of a narrow frame. At the same time, the assembly method is prone to loose fit with the display substrate 100 due to tolerance reasons, resulting in unsatisfactory realization of the function of the functional layer. If it is an integrated injection molding method, it is easy to cause micro-deformation of the display module in the display substrate 100, affecting the display effect. In addition, both methods require separate preparation of corresponding molds for display substrates of different models and sizes, which causes a certain degree of waste and high cost.

[0035] Therefore, the present invention provides a method for forming a middle frame of a display device, a method for manufacturing a display device, and a printing device to solve the problems that the functional layer effect of the middle frame of the display device is not ideal, it is difficult to meet the narrow frame requirement, and it is easy to cause poor display effect and high cost.

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, 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 a middle frame of a display device, comprising the following steps:

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

[0043] By means of 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 a waterproof material, an electromagnetic shielding material, a thermal conductive material, a rigid material, and an 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, Figure 3 As shown, the hybrid functional layer 22X is a complete layer structure formed by printing the hybrid material, rather than a superposition of multiple layers.

[0046] The method for forming the middle frame of the display device provided in this embodiment directly forms a functional layer of the mixed material by printing the mixed functional layer 22X by 3D printing, so that the functional layer is formed integrally with the middle frame body, and the middle frame 200 itself has the corresponding functions of the corresponding components in the mixed material, and can meet multiple functional requirements only through a single functional layer, without the need to make and assemble a separate functional layer to increase the function, thereby avoiding the problem that the assembled separate functional layer is difficult to fit tightly due to tolerance problems, thereby causing the function to be unsatisfactory, and thus the corresponding functional effect can be well achieved; since the functional layer and the middle frame body are integrally formed by 3D printing, on the one hand, no additional assembly is required, and it can well adapt to the narrow frame requirements; on the other hand, the 3D printing method will not cause deformation damage to the display module, and will not affect the display effect. In addition, 3D printing directly adjusts the printing scheme according to needs for printing, avoiding waste, and there is no need to prepare separate molds for different models, and the cost is low.

[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 to completely cover the edge area; the mixed material includes at least two or more of waterproof material, electromagnetic shielding material, thermal 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 a middle frame of the mixed functional layer by printing the mixed material directly on the edge area to completely cover the edge area. The middle frame has a high degree of tight fit with the display module, which is conducive to the realization of the function. The steps are simple and the production efficiency is high.

[0049] Furthermore, the mixed material is pre-mixed with two or more of the waterproof material, electromagnetic shielding material, thermal conductive material, rigid material and adhesive material, and 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 premixes different materials and then charges them into the print head. Compared with directly charging them into the print head, the mixing uniformity is higher and a preset mixing ratio can be preconfigured to ensure the realization of corresponding functions.

[0051] For further reference, Figure 4 and Figure 5 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 glues respectively; the step of forming the middle frame also includes: using the first print head to print the first printing glue along the inner edge of the edge area to form an inner retaining wall 211; using the first print head to print the first printing glue along the outer edge of the edge area to form an outer retaining wall 212; using the second print head to print the second printing glue in the edge area to form a filling layer 220, and the filling layer 220 completely fills the space in the edge area jointly defined by the inner retaining wall 211 and the outer retaining wall 212; wherein the second printing glue includes a mixed material, and the filling 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 the inner retaining wall 211 and the outer retaining wall 212 and then forming the filling layer. On the basis of ensuring the mixed functional layer 22X, the range of the middle frame can be well limited, and it will not overflow beyond the edge area to affect the display effect. The target area can be set to completely overlap with the edge area, so that the finally formed middle frame 200 completely overlaps with the edge area. And by using different printing glues to form the retaining wall and the filling layer 220 respectively, the appropriate glue can be selected as needed, so that the retaining wall and the filling layer have different glue properties when printing to meet different printing requirements.

[0053] Specifically, the viscosity of the first printing glue is greater than the viscosity of the second printing glue; the first printing glue is shape-preserving, and the second printing glue is fluid.

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

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

[0056] In the method for forming the middle frame of the display device provided by the present invention, if the viscosity of the first glue exceeds 2,000,000 cps, it will cause difficulties in discharging the glue and cause material breakage; if the viscosity of the first glue is lower than 1,000,000 cps, the printed anti-overflow wall is prone to insufficient rigidity and poor shape retention. Therefore, the viscosity of the first glue ranges from 1,000,000 cps to 2,000,000 cps, which can strike a balance between avoiding difficulties in discharging and ensuring the rigidity of the anti-overflow wall; if the viscosity of the second glue exceeds 500 cps, it is easy to cause problems such as slow leveling or uneven flow of the filling layer; if the viscosity of the second glue is lower than 20 cps, it is easy to cause uncontrolled dripping or hanging of the needle, affecting the morphology of the display substrate. The viscosity of the second glue ranges from 20 cps to 500 cps, which can strike a balance between ensuring smooth leveling of the filling layer and avoiding free dripping.

[0057] For 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 indented inward compared to the edge of the back plate 110, and the edge of the cover plate 130 is indented inward compared to the edge of the back plate 110; the inner retaining wall 211 is formed on the surface of the cover plate 130 in the edge area; the outer retaining wall 212 is formed on the surface of the back plate 110 in the edge area; the filling layer 220 covers the side of the cover plate 130 in the edge area and the side of the display module layer.

[0058] The method for forming the middle frame of the display device provided by the present invention reserves a position for filling the frame by indenting the display module layer and the cover plate, so that the frame area of ​​the final display device product can be finally maintained within the edge area and have a smaller size (otherwise a thicker assembly frame needs to be installed separately). The volume of the final display device product can be reduced, making the product lighter and thinner, and the frame ratio is reduced, which can bring better visual effects.

[0059] Furthermore, the 3D printing device also includes a scanning unit and a path calculation unit; the step of forming the middle frame also 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 according to the shape data; uses the first print head to print along the inner edge of the edge area according to the calculated printing path to form an inner retaining wall 211; uses the first print head to print along the outer edge of the edge area to form an outer retaining wall 212; uses the second print head to print in the edge area according to the calculated printing path to form a filling layer 220, and the filling layer 220 fills 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 by a scanning unit, calculates the corresponding printing path by a path calculation unit, and guides the print head to print the corresponding structure, thereby ensuring the formation accuracy of the middle frame.

[0061] In a specific implementation process: first, the 3D scanning unit scans the overall morphology of the display substrate, sets the printing parameters according to the specifications of the display substrate, and then the path calculation unit calculates the printing path of the inner and outer retaining walls and the filling layer according to the scanned morphology and the specifications of the display substrate to achieve printing.

[0062] Furthermore, the method for forming the middle frame of the display device provided in this embodiment can be applied to different printing methods. In the step of forming the middle frame, the 3D printing method includes direct writing 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 a middle frame of the display device is formed by the method for forming a middle frame of the display device provided in the first embodiment.

[0065] The manufacturing method of the display device provided in this embodiment uses the middle frame forming method of the display device provided by the present invention to form the middle frame. The functional layer of the mixed material is directly formed by printing the mixed functional layer by 3D printing, so that the functional layer and the middle frame body are formed in one piece, and the middle frame itself has the corresponding functions of the corresponding components in the mixed material, and there is no need to make and assemble a separate functional layer to add functions, which avoids the problem that the assembled separate functional layer is difficult to fit tightly due to tolerance problems, and then leads to unsatisfactory function realization, so the corresponding functional effect can be well achieved; because the functional layer and the middle frame body are formed in one piece by 3D printing, on the one hand, no additional assembly is required, and it can adapt well to the requirements of narrow bezels; on the other hand, the 3D printing method will not cause deformation damage to the display module, and will not affect the display effect. In addition, 3D printing directly adjusts the printing plan according to needs for printing, avoiding waste, and there is no need to prepare separate molds for different models, so the cost is low.

[0066] Example 3

[0067] This embodiment provides a display device, which is formed by the manufacturing method of the above-mentioned embodiment 2, including:

[0068] A display substrate, the display substrate comprising a back plate, a display module layer and a cover plate; the display substrate comprises an edge area, the edge area is an area including an edge of the back plate, an edge of the display module layer and an edge of the cover plate, and a width of the back plate, the display module layer and the cover plate from the edge to the center of the display substrate;

[0069] A middle frame, wherein the middle frame completely covers the edge area; the middle frame comprises:

[0070] An inner retaining wall, located at the inner edge of the edge zone;

[0071] An outer retaining wall, located at the outer edge of the edge area;

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

[0073] The filling layer is a mixed functional layer of a single-layer structure including at least two or more of waterproof material, electromagnetic shielding material, thermal conductive material, rigid material and adhesive material.

[0074] In the display device provided in this embodiment, the filling layer of the middle frame is a mixed functional layer of a single-layer structure of mixed materials, so that the functional layer is formed integrally with the middle frame body, and the middle frame itself has the corresponding functions of the corresponding components in the mixed material, and there is no need to make and assemble a separate functional layer to add functions, which avoids the problem that the assembled separate functional layer is difficult to fit tightly due to tolerance problems, thereby causing unsatisfactory function realization, so the corresponding functional effect can be well achieved; because the functional layer and the middle frame body are 3D printed integrally, on the one hand, no additional assembly is required, and it can well adapt to the requirements of narrow frames; on the other hand, the 3D printing method will not cause deformation damage to the display module and will not affect the display effect. In addition, 3D printing directly adjusts the printing plan according to needs for printing, avoiding waste, and there is no need to prepare separate molds for different models, so the cost is low.

[0075] Example 4

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

[0077] The display substrate includes a back plate, a display module layer, and a cover plate which are stacked in layers; the display substrate includes an edge area, which includes the edge of the back plate, the edge of the display module layer, and the edge of the cover plate, and the width of the area from the edge to the center of the display substrate.

[0078] refer to Figure 6 , the printing device comprises:

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

[0080] Feeding unit; the feeding unit includes multiple silos 340, each silo 340 is suitable for accommodating a printing material; the feeding unit also includes a mixing silo 350, the mixing silo 350 is connected to the multiple silos 340 and the print head 330 through a pipeline, and is suitable for mixing the feeds of the multiple silos 340 and then inputting them into the print head 330.

[0081] The printing device provided in this embodiment contains one printing material respectively through multiple silos 340, and then inputs into the print head for printing after mixing in the mixing silo 350. Different functional materials can be mixed in the mixing silo 350 according to a preset ratio to ensure the mixing uniformity, and then input into the print head 330. The print head 330 directly outputs the printing material, which can ensure that the material distribution of the formed mixed functional layer 22X is uniform, and can directly form a mixed functional layer 22X of multiple materials, so that each material can play a corresponding function in each part of the middle frame, and the functionality is consistent.

[0082] Furthermore, the mixing bin 350 includes a containing bin body, which is provided with a stirring assembly and a heating assembly; the stirring assembly includes a rotating motor, a rotating shaft and stirring blades; and the heating assembly includes an electric heating plate.

[0083] The printing device provided in this embodiment can stir in the mixing chamber 350 by rotating the motor, the rotating shaft and the stirring blade to form a stirring assembly to ensure uniform mixing of multiple materials. The mixing chamber 350 can be heated by the electric heating sheet to ensure the fluidity of the material and ensure uniform mixing of multiple materials.

[0084] Furthermore, in some embodiments, the printing unit includes at least two print heads 330, one of which is connected to the mixing bin, and the other print heads are individually connected to one bin one by one.

[0085] For example, Figure 7 As shown, the print head includes a first print head 331 and a second print head 332. The second print head 332 is connected to the mixing bin 350 hidden in the figure through a pipeline. The first print head 331 is connected one-to-one with other bins 340 that are not connected to the mixing bin 350. In this way, the first print head 331 and 332 can use different printing glues for printing.

[0086] The printing device provided in this embodiment is provided with at least two print heads, one for printing mixed materials to form a mixed functional layer; the others are individually connected one-to-one with different silos, and different printing materials can be used to form different structures such as inner retaining walls and outer retaining walls, and different printing materials can be filled according to different structural requirements.

[0087] Furthermore, the printing device also includes:

[0088] The carrier 310 is suitable for carrying the display substrate A;

[0089] A scanning unit (not shown in the figure), adapted to scan the shape of the display substrate A to obtain height data at different positions in the edge region of the display substrate;

[0090] A bracket 320, suitable for mounting a printing unit and a scanning unit;

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

[0092] The driving unit (not shown in the figure) is adapted to drive the bracket 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 realizes the basic functional support of the printing device through the stage 310, the bracket 320, the path calculation unit and the driving unit.

[0094] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A method for forming a middle frame of a display device, characterized in that: The following steps are involved: A display substrate is provided, the display substrate comprising a back plate, a display module layer and a cover plate; the display substrate comprises an edge area, the edge area is an area including an edge of the back plate, an edge of the display module layer and an edge of the cover plate, and a 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 is formed in a target area on the surface of the display substrate by 3D printing, and the middle frame completely covers the edge area; the middle frame includes a hybrid functional layer, and the material of the hybrid functional layer includes at least two or more of a waterproof material, an electromagnetic shielding material, a thermal conductive material, a rigid material and an adhesive material.

2. The method for forming a middle frame of a display device according to claim 1, wherein: In the step of forming the middle frame, a print head of a 3D printing device is used to print a mixed material into the edge area to completely cover the edge area; the mixed material includes at least two or more of waterproof material, electromagnetic shielding material, thermal conductive material, rigid material and adhesive material.

3. The method for forming a middle frame of a display device according to claim 2, wherein: The mixed material is prepared by pre-mixing two or more of the waterproof material, the electromagnetic shielding material, the thermal conductive material, the rigid material and the adhesive material, and then filling the mixed material into the print head of the 3D printing device for printing.

4. The method for forming a middle frame of a display device according to claim 3, wherein: The 3D printing device comprises a first print head and a second print head; the first print head and the second print head use different printing glues respectively; The step of forming the middle frame further includes: Using a first print head to print a first printing glue along the inner edge of the edge area to form an inner retaining wall; Using a first print head to print a first printing glue along the outer edge of the edge area to form an outer retaining wall; Using a second print head to print a second printed glue in the edge area to form a filling layer, wherein the filling layer completely fills the space defined by the inner retaining wall and the outer retaining wall in the edge area; Wherein, the second printing glue includes the mixed material, and the filling layer is the mixed functional layer.

5. The method for forming a middle frame of a display device according to claim 4, characterized in that: The edge of the display module layer is indented inwards compared to the edge of the back plate, and the edge of the cover plate is indented inwards compared to the edge of the back plate; The inner retaining wall is formed on the surface of the cover plate in the edge area; the outer retaining wall is formed on the surface of the back plate in the edge area; The filling layer covers the side of the cover plate and the side of the display module layer in the edge area.

6. The method for forming a middle frame of a display device according to claim 4, wherein: The viscosity of the first printing glue is greater than the viscosity of the second printing glue; the first printing glue is shape-preserving, and the second printing glue is fluid.

7. The method for forming a middle frame of a display device according to claim 4, 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 according to the shape data; Using the first print head to print along the inner edge of the edge area according to the calculated printing path to form an inner retaining wall; using the first print head to print along the outer edge of the edge area to form an outer retaining wall; The second print head is used to print and form a filling layer in the edge area according to the calculated printing path, and the filling layer fills the space in the edge area defined by the inner retaining wall and the outer retaining wall.

8. The method for forming a middle frame of a display device according to claim 1, wherein: In the step of forming the middle frame, the 3D printing method includes direct writing printing, piezoelectric valve printing, striker valve printing, and inkjet printing.

9. A method for manufacturing a display device, characterized in that: The middle frame of the display device is formed by the method for forming the middle frame of the display device according to any one of claims 1 to 8.

10. A display device, characterized in that: include: A display substrate, the display substrate comprising a back plate, a display module layer and a cover plate; the display substrate comprises an edge area, the edge area is an area including an edge of the back plate, an edge of the display module layer and an edge of the cover plate, and a 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, wherein the middle frame completely covers the edge area; the middle frame comprises: An inner retaining wall, located at the inner edge of the edge zone; An outer retaining wall, located at the outer edge of the edge area; A filling layer completely fills the space defined by the inner retaining wall and the outer retaining wall in the edge area; The filling layer is a mixed functional layer of a single-layer structure including at least two or more of waterproof material, electromagnetic shielding material, thermal conductive material, rigid material and adhesive material.

11. A printing device, suitable for performing 3D printing on a display substrate to form a middle frame; the display substrate comprises a back plate, a display module layer, and a cover plate which are stacked; the display substrate comprises an edge region, the edge region comprises an edge of the back plate, an edge of the display module layer, and an edge of the cover plate, and an area from the edge to the width of the center of the display substrate; It is characterized in that The printing device comprises: A printing unit; the printing unit comprises at least one print head; A feeding unit; the feeding unit comprises a plurality of silos, each of which is suitable for accommodating a type of printing material; the feeding unit further comprises a mixing silo, which is connected to the plurality of silos and the print head via a pipeline and is suitable for mixing the feeds of the plurality of silos and then inputting them into the print head.

12. The printing device according to claim 11, characterized in that: The mixing bin comprises a containing bin body, and the containing bin body is provided with a stirring component and a heating component; The stirring assembly includes a rotating motor, a rotating shaft and a stirring blade; The heating component includes a heating plate.

13. The printing device according to claim 11, characterized in that: The printing unit comprises at least two printing heads, one of which is connected to the mixing bin, and the other printing heads are individually connected to one of the bins one by one.

14. The printing device according to claim 11, characterized in that: Also includes: A carrier, suitable for carrying the display substrate; a scanning unit, adapted to scan the shape of the display substrate to obtain height data at different positions in the edge region of the display substrate; A bracket, suitable for mounting the printing unit and the scanning unit; A path calculation unit, adapted to receive the data acquired by the scanning unit and calculate a 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.

Images