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

Abstract

The invention relates to the technical field of 3D printing, in particular to a middle frame forming method of a display device, a display device manufacturing method and a printing device. The middle frame forming method of the display device comprises the steps that a printing base body is provided and comprises a curved-surface back plate or a plane back plate, a display module layer and a cover plate which are arranged in a laminated mode; the edge of the display module layer and the edge of the cover plate are inwards retracted relative to the edge of the back plate; the radian of the printing substrate in the edge area is larger than that in the non-edge area; printing a middle frame material in the edge area to form a middle frame; a five-axis linkage printing device capable of adjusting the position and the orientation angle of a printing head is used, and a first anti-overflow wall and a second anti-overflow wall are formed on the edge of the side, away from the center of a printing base body, in an edge area and the edge of the side, close to the center position of the printing base body, in the edge area in sequence. The printing requirements of different curved-surface middle frames can be flexibly met.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a method for forming a middle frame of a display device, a method for manufacturing the display device, and a printing device. Background Art

[0002] With the development of display technology, the shapes of display screens are becoming more and more special. For example, a display screen with curved sides needs to be matched with a corresponding middle frame with curved sides. The current mainstream manufacturing method of this middle frame is to form it through one-piece injection molding. In this injection molding process, in order to form a closed injection cavity, the display module will be squeezed to a certain extent, and this squeezing will cause a certain degree of micro-deformation to the non-rigid area of ​​the display module, which may have a bad effect on the display effect of the screen; and the one-piece injection molding middle frame solution requires re-molding for each product with different edge curves, the mold opening cost is very high, and the mold waste is serious.

[0003] Therefore, a solution is needed to solve the problem that the manufacturing of the middle frame of a display device with a curved edge area will cause deformation of the display module, affecting the display effect and high cost. Summary of the invention

[0004] Therefore, in order to solve the problem that manufacturing a middle frame of a display device with a curved edge area may cause deformation of the display module, affect the display effect and have high costs, 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.

[0005] The present invention provides a method for forming a middle frame of a display device, comprising: providing a printing substrate, wherein the printing substrate comprises a back plate, a display module layer and a cover plate which are stacked and have the same curvature and are curved or flat; the edge of the display module layer and the edge of the cover plate are indented inwardly compared with the edge of the back plate; the printing substrate comprises an edge area, wherein 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 an area of ​​a certain width from the edge of the back plate, the display module layer and the cover plate to the center of the printing substrate; the curvature of the printing substrate in the edge area is greater than The curvature in the non-edge area; printing the middle frame, printing the middle frame material in the edge area along the edge of the printing substrate to form the middle frame; wherein, firstly forming an anti-overflow wall in the edge area, and then printing and filling the area within the anti-overflow wall in the edge area; comprising: using a five-axis linkage printing device with adjustable print head position and orientation angle, adjusting the orientation angle and position of the print head, forming a first anti-overflow wall and a second anti-overflow wall at the edge of the edge area away from the center position of the printing substrate and the edge of the edge area close to the center position of the printing substrate.

[0006] Optionally, in the five-axis linkage printing device, the print head is suitable for moving along mutually perpendicular X-axis and Y-axis in a horizontal plane, and is suitable for moving along a Z-axis perpendicular to the plane where the X-axis and the Y-axis are located, and also has an A-axis suitable for rotating the print head in the XY plane and a C-axis suitable for rotating the print head in the XZ plane; in the step of printing the middle frame, the print head is moved by cooperating with the X-axis, the Y-axis and the Z-axis, and the orientation angle of the print head is adjusted by cooperating with the A-axis and the C-axis to print the first anti-overflow wall and the second anti-overflow wall.

[0007] Optionally, the five-axis linkage printing device has at least two print heads. In the step of printing the middle frame, the two print heads are used to synchronously print the first anti-overflow wall and the second anti-overflow wall.

[0008] Optionally, in the step of printing the middle frame, the anti-overflow wall formed on the edge close to the center position of the printing substrate is the first anti-overflow wall; the anti-overflow wall formed on the edge away from the center position of the printing substrate is the second anti-overflow wall; the second anti-overflow wall is at least located at the edge of the display module layer or outside the edge of the display module layer; the space between the first anti-overflow wall and the second anti-overflow wall is filled by printing to form a first filling layer; the first filling layer covers the surface of the display module layer and the surface of the cover plate exposed in the edge area.

[0009] Optionally, the second anti-overflow wall is arranged at the edge of the display module layer; the step of printing the middle frame also includes: printing and filling the space between the second anti-overflow wall and the edge of the back plate to form a second filling layer.

[0010] Optionally, the display module layer includes multiple layers, including at least a first display module layer close to the back panel and a second display module layer away from the back panel; the distance between the edge of the first display module layer and the edge of the back panel is greater than the distance between the edge of the second display module layer and the edge of the back panel, and a gap is formed between the second display module layer and the back panel; the second anti-overflow wall is arranged at the edge of the second display module layer; in the step of printing the middle frame, the second filling layer also fills the gap between the second display module layer and the surface of the back panel.

[0011] Optionally, the middle frame material includes a first glue for forming an anti-overflow wall and a second glue for printing and filling; the viscosity of the first glue is greater than the viscosity of the second glue; the first glue is conformal and the second glue is fluid.

[0012] Optionally, in the step of printing the middle frame, the printing method includes direct writing printing, piezoelectric valve printing, needle valve printing, and inkjet printing.

[0013] The present invention further 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.

[0014] The present invention also provides a printing device, which is suitable for 3D printing a printing substrate to form a middle frame; the printing substrate includes a back plate, a display module layer and a cover plate, which are stacked and have the same curvature of the curved surface or the flat surface; the edge of the display module layer and the edge of the cover plate are indented inward compared with the edge of the back plate; the printing 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 of ​​the back plate, the display module layer and the cover plate from the edge to the center of the printing substrate with a certain width; the curvature of the printing substrate in the edge area is greater than that in the non-edge area; the printing device includes: a carrier, suitable for carrying the printing substrate; a printing unit, suitable for printing the middle frame material in the edge area printing to form a middle frame whose curvature matches the edge area; the printing unit includes a print head; a bracket, suitable for installing the printing unit; the bracket is also provided with a five-axis linkage assembly connected to the print head, the five-axis linkage assembly adjusts the orientation angle and position of the print head, and forms a first anti-overflow wall and a second anti-overflow wall at an edge on the side of the edge area away from the center position of the printing substrate and an edge on the side of the edge area close to the center position of the printing substrate; a driving unit, suitable for driving the bracket to move, so as to drive the printing unit to move; the driving unit is a variable speed driving device; a numerical control unit, suitable for controlling the driving unit to drive the bracket to drive the printing unit to move and drive the five-axis linkage assembly to drive and rotate the print head.

[0015] Optionally, the five-axis linkage assembly includes a planar moving assembly and a rotating assembly; the planar moving assembly is suitable for driving the print head to move in three orthogonal planes; the rotating assembly is suitable for driving the print head to rotate along a certain rotation axis in two of the three orthogonal planes.

[0016] Optionally, the five-axis linkage assembly includes: an X-axis moving assembly, a Y-axis moving assembly, a Z-axis moving assembly, an A-axis rotation assembly and a C-axis rotation assembly; wherein the X-axis and the Y-axis are perpendicular to each other in a horizontal plane, the Z-axis is perpendicular to the XY plane, the A-axis is a rotation axis that drives the print head to rotate in the XY plane, and the C-axis is a rotation axis that drives the print head to rotate in the XZ plane; the CNC unit is suitable for driving the X-axis moving assembly, the Y-axis moving assembly, the Z-axis moving assembly, the A-axis rotation assembly and the C-axis rotation assembly to drive the print head to move and rotate.

[0017] Optionally, the printing unit includes an anti-overflow wall printing unit and a filling glue printing unit; the anti-overflow wall printing unit includes one or more anti-overflow wall printing heads; the anti-overflow wall print head is connected to the five-axis linkage assembly; the filling glue printing unit includes a filling glue print head, and the filling glue print head is separately connected to the five-axis linkage assembly.

[0018] The beneficial effects of the technical solution of the present invention are:

[0019] The method for forming the middle frame of the display device provided by the present invention, through the method of 3D printing, first forms an anti-overflow wall, and then prints and fills in the anti-overflow wall to form a filling layer, and together forms the middle frame. Among them, a five-axis linkage printing device with adjustable print head position and orientation angle is used to adjust the orientation angle and position of the print head to form an anti-overflow wall in the edge area. The retaining wall is formed by 3D printing instead of one-piece injection molding, so as to avoid deformation damage to the display module caused by one-piece injection molding. And the position and angle of the print head can be freely adjusted by the five-axis linkage printing device, so as to conveniently form an anti-overflow wall and a filling layer, so that a middle frame matching the curvature of the edge area can be conveniently formed, which can meet the needs of the curved edge of the display device with different curvatures, and has a wide range of applications. Therefore, only one set of equipment is required for products with different curvatures, and there is no need to re-cast the mold, which avoids the problems of low mold utilization and long-term wear and tear. It also eliminates the problem of mismatch of the frame size of the final mold due to the tolerance during mold manufacturing. In addition, the curved surface inclination of the middle frame formed by printing can be controlled by controlling different inclination angles during the printing process. At the same time, a manufacturing method of a display device corresponding to the forming method and a printing device used therein are provided, which can achieve corresponding beneficial effects.

[0020] The method for forming the middle frame of the display device provided by the present invention uses the five-axis linkage printing device, the print head is suitable for moving along the X-axis and Y-axis perpendicular to each other in the horizontal plane, and is suitable for moving along the Z-axis perpendicular to the plane where the X-axis and the Y-axis are located, and also has an A-axis suitable for rotating the print head in the XY plane and a C-axis suitable for rotating the print head in the XZ plane; in the step of printing the middle frame, the print head is moved by cooperating with the X-axis, Y-axis and Z-axis, and the orientation angle of the print head is adjusted by cooperating with the A-axis and C-axis to print the first anti-overflow wall and the second anti-overflow wall. In this way, the print head can be moved in the three axial directions of XYZ, and the print head can be rotated in the two rotation directions of the A-axis and the C-axis, so that the position and orientation of the print head can be freely adjusted as needed.

[0021] In the method for forming a middle frame of a display device provided by the present invention, when the second anti-overflow wall is arranged at the edge of the display module layer, the step of printing the middle frame further comprises: printing and filling the space between the second anti-overflow wall and the edge of the back plate to form a second filling layer. Figure 1 ), which is relatively difficult. At the same time, due to the requirement for oblique angles, the printing accuracy is relatively low, and the needle surface distance needs to be relatively small (usually within 100μm). Since the requirements for both the needle surface distance and the angle are relatively stringent, needle collisions are prone to occur. Therefore, the edge area is divided into two areas through the edge of the anti-overflow wall and the edge of the back plate, and the middle frame is filled in sequence (that is, the areas are divided to form the first filling layer and the second filling layer, which are filled separately). In this way, the formation angle of the anti-overflow wall can be relatively free, and then the direction of the print head can be relatively free to set, which can reduce the difficulty of printing. And after the edge area is divided into two areas, since the print head direction is relatively free to set, the needle surface distance can also be increased to more than 500μm, which can reduce the risk of needle collision.

[0022] The method for forming a middle frame of a display device provided by the present invention, in some embodiments, the display module layer includes multiple layers, including at least a first display module layer close to the back plate and a second display module layer away from the back plate; the distance between the edge of the first display module layer and the edge of the back plate is greater than the distance between the edge of the second display module layer and the edge of the back plate, and a gap is formed between the second display module layer and the back plate; the second anti-overflow wall is set at the edge of the second display module layer; in the step of printing the middle frame, the second filling layer also fills the gap between the second display module layer and the surface of the back plate. In some embodiments, due to the design of the display module layer, a structure with uneven edge sides and a gap between part of the film layer and the back plate is formed. The special position of the second anti-overflow wall can make it easier for the second filling layer to be filled into the gap between the second display module layer and the back plate from the outside, so that the filling protection is more stringent and the protection effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 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;

[0025] Figure 2 for Figure 1 A schematic structural diagram of an embodiment;

[0026] Figure 3 A 3D height image of a side (long side) of the middle frame scanned by a 3D camera after printing is completed in a method for forming a middle frame of a display device according to an embodiment of the present invention;

[0027] Figure 4 A 3D height image of the bottom side (short side) of the middle frame scanned by a 3D camera after printing is completed in a method for forming a middle frame of a display device according to an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of a state when a first filling layer is formed in a method for forming a middle frame of a display device according to another embodiment of the present invention;

[0029] Figure 6 for Figure 5 A schematic diagram of a state when the second filling layer is formed in the embodiment;

[0030] Figure 7 The figure is a schematic diagram of the state of a part of the structure of a printing device in a printing process according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention provides a method for forming a middle frame of a display device and a method for manufacturing the display device, so as to solve the problem in the prior art that the manufacturing of the middle frame of a display device with a curved edge area may cause deformation to a display module, affect the display effect and have high cost.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Example 1

[0037] refer to Figure 1 and Figure 2 This embodiment provides a method for forming a middle frame of a display device, comprising:

[0038] A printing substrate is provided, the printing substrate comprising a back plate 110, a display module layer 120 and a cover plate 130 which are stacked and have the same curvature, and the edges of the display module layer 120 and the cover plate 130 are indented inwardly compared with the edge of the back plate 110; the printing substrate comprises an edge area, the edge area is an area including the edge of the back plate 110, the edge of the display module layer 120 and the edge of the cover plate 130, and a certain width from the edge of the back plate 110, the display module layer 120 and the cover plate 130 to the center of the printing substrate; the curvature of the printing substrate in the edge area is greater than that in the non-edge area;

[0039] Printing a middle frame, printing a middle frame material in the edge area along an edge of the printing substrate to form the middle frame;

[0040] Wherein, firstly, an anti-overflow wall 210 is formed in the edge area, and then, a filling layer 220 is formed by printing and filling in the area within the anti-overflow wall in the edge area; comprising:

[0041] A five-axis linkage printing device capable of adjusting the position and orientation angle of the print head is used to adjust the orientation angle and position of the print head (the print head is not shown in the figure), and a first anti-overflow wall and a second anti-overflow wall are formed at the edge of the edge area away from the center position of the printing substrate and the edge of the edge area close to the center position of the printing substrate; the anti-overflow wall 210 includes the above-mentioned first anti-overflow wall and the second anti-overflow wall.

[0042] The method for forming the middle frame of the display device provided in this embodiment is to first form the anti-overflow wall 210 by a 3D printing method, and then print the filling layer 220 in the area formed by the anti-overflow wall 210 to form the middle frame together. Among them, a five-axis linkage printing device with adjustable print head position and orientation angle is used to adjust the orientation angle and position of the print head to form the anti-overflow wall 210 in the edge area. The retaining wall is formed by 3D printing instead of one-piece injection molding, so as to avoid deformation damage to the display module caused by one-piece injection molding. And the position and angle of the print head can be freely adjusted by the five-axis linkage printing device, so as to conveniently form the anti-overflow wall 210 and the filling layer 220, so as to conveniently form a middle frame matching the curvature of the edge area, which can adapt to the needs of the curved edge of the display device with different curvatures, and has a wide range of applications. Therefore, only one set of equipment is required for products with different curvatures, and there is no need to re-cast the mold, which avoids the problems of low mold utilization and long-term wear and tear. It also eliminates the problem of mismatch of the frame size of the final mold due to the tolerance during mold manufacturing.

[0043] In addition, the inclination angle of the curved surface after printing can be controlled. Figure 3 and Figure 4 , Figure 3 After printing, use a 3D camera to scan the 3D height image of the side (long side) of the middle frame. Figure 4 This is the 3D height image of the bottom edge (short edge) of the middle frame scanned by a 3D camera after printing. The arc surface in the figure corresponds to Figure 5 , Figure 6 From the arc surface in the figure, we can see that the arc surface on the side is different from the arc surface on the bottom. This is the effect achieved by controlling different inclination angles during the printing process.

[0044] Furthermore, in the five-axis linkage printing device, the print head is suitable for moving along mutually perpendicular X-axis and Y-axis in a horizontal plane, and is suitable for moving along a Z-axis perpendicular to the plane where the X-axis and the Y-axis are located, and also has an A-axis suitable for rotating the print head in the XY plane and a C-axis suitable for rotating the print head in the XZ plane; in the step of printing the middle frame, the print head is moved by cooperating with the X, Y and Z axes, and the orientation angle of the print head is adjusted by cooperating with the A and C axes to print the first anti-overflow wall and the second anti-overflow wall. In this way, the print head can be moved in the three axial directions of XYZ, and can be rotated in the two rotation directions of the A and C axes, so that the position and orientation of the print head can be freely adjusted as needed.

[0045] Furthermore, in some embodiments, the five-axis linkage printing device has at least two print heads, and in the step of printing the middle frame, the two print heads are used to synchronously print the first anti-overflow wall and the second anti-overflow wall. Using two print heads to synchronously print the first anti-overflow wall and the second anti-overflow wall can complete the printing of the anti-overflow wall in one step, saving process steps and making the process flow more concise.

[0046] For further reference, Figure 1 , combined with Figure 5 In some embodiments, in the step of printing the middle frame, the anti-overflow wall formed at the edge close to the center of the printed substrate is the first anti-overflow wall 211; the anti-overflow wall formed at the edge away from the center of the printed substrate is the second anti-overflow wall 212; the second anti-overflow wall 212 is at least located at the edge of the display module layer 120 or outside the edge of the display module layer 120; the space 212 between the first anti-overflow wall 211 and the second anti-overflow wall is filled by printing to form a first filling layer 221; the first filling layer 221 covers the surface of the display module layer 120 (including 121, 122) exposed in the edge area and the surface of the cover plate 130. In this way, the display module layer 120 and the surface of the cover plate in the edge area are completely covered by the first filling layer 221 to achieve protection.

[0047] For further reference, Figure 6 The second anti-overflow wall 212 is arranged at the edge of the display module layer 120; the step of printing the middle frame also includes: printing and filling the space between the second anti-overflow wall 212 and the edge of the back plate 110 to form a second filling layer 222.

[0048] Due to the five-axis linkage method, the dual print heads are controlled to form an oblique overflow prevention wall 210 (reference Figure 1 ), which is relatively difficult. At the same time, due to the requirement for oblique angles, the printing accuracy is relatively low, and the needle surface distance needs to be relatively small (usually within 100μm). Since the requirements for both the needle surface distance and the angle are relatively stringent, needle collisions are prone to occur. Therefore, the edge area is divided into two areas through the edge of the anti-overflow wall 210 and the edge of the back plate 110, and the middle frame is filled in sequence (that is, the areas are divided to form the first filling layer 221 and the second filling layer 222, which are filled separately). In this way, the formation angle of the anti-overflow wall 210 can be relatively free, and then the orientation direction of the print head can be relatively freely set, which can reduce the difficulty of printing. And after the edge area is divided into two areas, since the orientation of the print head is relatively free to set, the needle surface distance can also be increased to more than 500μm, which can reduce the risk of needle collisions.

[0049] For further reference, Figure 6In some embodiments, the display module layer 120 includes multiple layers, including at least a first display module layer 121 close to the back panel and a second display module layer 122 away from the back panel; the distance between the edge of the first display module layer 121 and the edge of the back panel 110 is greater than the distance between the edge of the second display module layer 122 and the edge of the back panel 110, and a gap is formed between the second display module layer 122 and the back panel 110; the second anti-overflow wall 212 is set at the edge of the second display module layer 122; in the step of printing the middle frame, the second filling layer 222 also fills the gap between the second display module layer 122 and the surface of the back panel 110.

[0050] In some embodiments, due to the design of the display module layer, the edge sides are uneven, and a gap is formed between part of the film layer and the back plate. The special position of the second anti-overflow wall 212 allows the second filling layer 222 to be more easily filled from the outside into the gap between the second display module layer 122 and the back plate 110, making the filling protection more rigorous and the protection effect better.

[0051] In some embodiments, the angle between the curved tangent of the edge area of ​​the printing substrate and the first anti-overflow wall 211 is the same as the angle between the curved tangent of the edge area of ​​the printing substrate and the second anti-overflow wall 212. In addition, due to certain mechanical errors and operational errors, it is usually difficult to achieve absolute equality between the angle between the curved tangent of the edge area of ​​the printing substrate and the first anti-overflow wall and the angle between the curved tangent of the edge area of ​​the printing substrate and the second anti-overflow wall. It is generally believed that the two can be considered the same when the difference is less than 2°. The same angle can be achieved by controlling the position and orientation of the print head. The same angle is conducive to the middle frame forming a curved surface that matches the curved surface of the edge area of ​​the printing substrate.

[0052] In some other embodiments, the angle between the curved tangent line of the edge area of ​​the printing substrate and the first anti-overflow wall 211 and the angle between the curved tangent line of the edge area of ​​the printing substrate and the second anti-overflow wall 212 may also be different.

[0053] In some embodiments, the first anti-overflow wall 211 is at an angle greater than 0° and less than 180° with the horizontal plane; the second anti-overflow wall 212 is at an angle greater than 0° and less than 180° with the horizontal plane; the angle greater than 0° and less than 180° with the horizontal plane can basically eliminate the need to adjust the A-axis and the C-axis, which is simple to control and further reduces the risk of pin collision. In some preferred embodiments, the first anti-overflow wall 211 is at an angle of 45°-135° with the horizontal plane, and the second anti-overflow wall 212 is at an angle of 45°-135° with the horizontal plane. In some specific embodiments, the first anti-overflow wall 211 is at an angle of 90° with the horizontal plane, and the second anti-overflow wall 212 is at an angle of 90° with the horizontal plane. When printing the first anti-overflow wall 211, the needle-surface distance between the print head and the printing surface is 10μm-1000μm; further, for example, it can be greater than 500μm and less than 1000μm; when printing the second anti-overflow wall 212, the needle-surface distance between the print head and the printing surface is 10μm-1000μm; further, for example, it can be greater than 500μm and less than 1000μm. A higher needle-surface distance (10μm-1000μm, in particular, 500μm-1000μm) can also reduce the risk of needle collision (here specifically referring to the collision between the print head and the curved surface of the display device).

[0054] Furthermore, the middle frame material includes a first glue for forming an anti-overflow wall and a second glue for printing and filling; the viscosity of the first glue is greater than the viscosity of the second glue; the first glue is conformal, and the second glue is fluid; according to the different viscosity properties of the glue, the anti-overflow wall and the filling layer are printed separately, and different print heads are selected to print different glues, which can make the final molding effect better and the printing smoother. The first glue has better conformal properties, and the second glue has better fluidity. In some preferred embodiments, the viscosity of the first glue is 1000000cps-2000000cps; the viscosity of the second glue is 50cps-500cps.

[0055] Furthermore, in the step of printing the middle frame, the printing method includes direct writing printing, piezoelectric valve printing, needle valve printing, and inkjet printing.

[0056] Example 2

[0057] 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 a display device provided in the first embodiment.

[0058] The manufacturing method of the display device provided in the present embodiment adopts the middle frame forming method provided by the present invention to form the middle frame. A five-axis linkage printing device capable of adjusting the position and orientation angle of the print head is used to adjust the orientation angle and position of the print head to form an anti-overflow wall in the edge area. 3D printing is used instead of one-piece injection molding to form the retaining wall, thereby avoiding deformation damage to the display module caused by one-piece injection molding. In addition, the position and angle of the print head can be freely adjusted through the five-axis linkage printing device, thereby conveniently forming an anti-overflow wall and a filling layer, so that a middle frame matching the curvature of the edge area can be conveniently formed, which can adapt to the needs of the curved edges of display devices with different curvatures and has a wide range of applications. Therefore, only one set of equipment is required for products with different curvatures, and there is no need to re-cast the mold, which avoids the problems of low mold utilization and long-term wear and tear. It also eliminates the problem of mismatch in the size of the final molded frame due to tolerances during mold manufacturing.

[0059] Example 3

[0060] This embodiment provides a printing device suitable for performing 3D printing on a printing substrate to form a middle frame;

[0061] Combination Figure 1 , the printing substrate comprises a back plate, a display module layer and a cover plate which are stacked and have the same curvature and are curved or flat; the edge of the display module layer and the edge of the cover plate are indented inward compared with the edge of the back plate; the printing substrate comprises an edge area, 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 of ​​the back plate, the display module layer and the cover plate from the edge to the center of the printing substrate with a certain width; the curvature of the printing substrate in the edge area is greater than that in the non-edge area;

[0062] refer to Figure 7 , the printing device comprises:

[0063] The carrier 310 is suitable for carrying the printing substrate A.

[0064] The printing unit is suitable for printing the middle frame material in the edge area to form a middle frame whose curvature matches the edge area; the printing unit includes a print head.

[0065] The bracket 320 is suitable for installing the printing unit (including 331 and 332 in the figure); the bracket is also provided with a five-axis linkage assembly (not shown in the figure) connected to the print head, and the five-axis linkage assembly adjusts the orientation angle and position of the print head, and forms a first anti-overflow wall and a second anti-overflow wall at the edge of the edge area away from the center position of the printing substrate and the edge of the edge area close to the center position of the printing substrate.

[0066] The driving unit (not shown in the figure) is suitable for driving the bracket to move so as to drive the printing unit to move; the driving unit is a variable speed driving device.

[0067] The numerical control unit (not shown in the figure) is suitable for controlling the driving unit to drive the bracket to drive the printing unit to move and drive the five-axis linkage assembly to drive the printing head to move and rotate.

[0068] The printing device provided by the present invention is suitable for 3D printing a printing substrate to form a middle frame using the middle frame forming method provided by the present invention. A five-axis linkage printing device with adjustable print head position and orientation angle is used to adjust the orientation angle and position of the print head to form an anti-overflow wall in the edge area. The retaining wall is formed by 3D printing instead of one-piece injection molding, thereby avoiding deformation damage to the display module caused by one-piece injection molding. In addition, the position and angle of the print head can be freely adjusted by the five-axis linkage printing device, thereby conveniently forming an anti-overflow wall and a filling layer, so that a middle frame matching the curvature of the edge area can be conveniently formed, which can meet the needs of the curved edge of the display device with different curvatures and has a wide range of applications. Therefore, only one set of equipment is required for products with different curvatures, and there is no need to re-cast the mold, which avoids the problems of low mold utilization and long-term wear and tear. It also eliminates the problem of mismatch in the size of the final molded frame due to tolerances during mold manufacturing.

[0069] Furthermore, in some embodiments, the five-axis linkage assembly includes a plane moving assembly and a rotation assembly; the plane moving assembly is suitable for driving the print head to move in three orthogonal planes; the rotation assembly is suitable for driving the print head to rotate along a certain rotation axis in two of the three orthogonal planes. In this way, the print head can have five degrees of freedom to print on the curved surface of the printing substrate.

[0070] Specifically, in some embodiments, the five-axis linkage assembly includes: an X-axis moving assembly, a Y-axis moving assembly, a Z-axis moving assembly, an A-axis rotating assembly, and a C-axis rotating assembly; wherein the X-axis and the Y-axis are perpendicular to each other in the horizontal plane, the Z-axis is perpendicular to the XY plane, the A-axis is a rotating axis that drives the print head to rotate in the XY plane, and the C-axis is a rotating axis that drives the print head to rotate in the XZ plane; the numerical control unit is suitable for driving the X-axis moving assembly, the Y-axis moving assembly, the Z-axis moving assembly, the A-axis rotating assembly, and the C-axis rotating assembly to drive the print head to move and rotate. This arrangement enables the print head to have five degrees of freedom in five directions, and the five axes in the five-axis linkage assembly can be used to drive the print head to move or rotate to match the curved surface of the printing substrate for printing.

[0071] Further, in some embodiments, the printing unit includes an anti-overflow wall printing unit 331 and a filling glue printing unit 332; the anti-overflow wall printing unit 331 includes one or more anti-overflow wall printing heads; the anti-overflow wall printing head is connected to the five-axis linkage assembly; the filling glue printing unit 332 includes a filling glue printing head, and the filling glue printing head is separately connected to the five-axis linkage assembly.

[0072] In this way, by connecting different print heads to the five-axis linkage components respectively, different printing requirements for the middle frame that match the curvature of the edge area can be achieved.

[0073] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, 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 therefrom are still within the scope of protection of the invention.

Claims

1. A method for forming a middle frame of a display device, characterized in that: include: Providing a printing substrate, the printing substrate comprising a back plate, a display module layer and a cover plate which are stacked and have curved or flat surfaces with the same curvature; The edge of the display module layer and the edge of the cover plate are indented inwards compared to the edge of the back plate; the printing 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 an area of ​​a certain width from the edge of the back plate, the display module layer and the cover plate to the center of the printing substrate; the curvature of the printing substrate in the edge area is greater than that in the non-edge area; Printing a middle frame, printing the middle frame material in the edge area along the edge of the printing substrate to form the middle frame; wherein, first forming an anti-overflow wall in the edge area, and then printing and filling in the area within the anti-overflow wall in the edge area to form a filling layer; comprising: using a five-axis linkage printing device with adjustable print head position and orientation angle, adjusting the orientation angle and position of the print head, forming a first anti-overflow wall and a second anti-overflow wall at the edge of the edge area away from the center position of the printing substrate and the edge of the edge area close to the center position of the printing substrate.

2. The method for forming a middle frame of a display device according to claim 1, wherein: The five-axis linkage printing device, wherein the print head is adapted to move along mutually perpendicular X-axis and Y-axis in a horizontal plane, and adapted to move along a Z-axis perpendicular to the plane where the X-axis and the Y-axis are located, and also has an A-axis adapted to rotate the print head in the XY plane and a C-axis adapted to rotate the print head in the XZ plane; In the step of printing the middle frame, the print head is moved by cooperating with the X-axis, the Y-axis and the Z-axis, and the orientation angle of the print head is adjusted by cooperating with the A-axis and the C-axis to print the first anti-overflow wall and the second anti-overflow wall.

3. The method for forming a middle frame of a display device according to claim 2, wherein: The five-axis linkage printing device has at least two print heads. In the step of printing the middle frame, the two print heads are used to synchronously print the first anti-overflow wall and the second anti-overflow wall.

4. The method for forming a middle frame of a display device according to claim 2, wherein: In the step of printing the middle frame, The anti-overflow wall formed at the edge of one side close to the center position of the printing substrate is the first anti-overflow wall; The anti-overflow wall formed at the edge of one side away from the center position of the printing substrate is a second anti-overflow wall; The second anti-overflow wall is at least located at the edge of the display module layer or outside the edge of the display module layer; Printing and filling the space between the first anti-overflow wall and the second anti-overflow wall to form a first filling layer; The first filling layer covers the surface of the display module layer and the surface of the cover plate exposed in the edge region.

5. The method for forming a middle frame of a display device according to claim 4, characterized in that: The second anti-overflow wall is arranged at the edge of the display module layer; The step of printing the middle frame also includes: The space between the second anti-overflow wall and the edge of the back plate is printed and filled to form a second filling layer.

6. The method for forming a middle frame of a display device according to claim 5, characterized in that: The display module layer includes multiple layers, including at least a first display module layer close to the back plate and a second display module layer far from the back plate; the distance between the edge of the first display module layer and the edge of the back plate is greater than the distance between the edge of the second display module layer and the edge of the back plate, and a gap is formed between the second display module layer and the back plate; The second anti-overflow wall is arranged at the edge of the second display module layer; In the step of printing the middle frame, the second filling layer also fills the gap between the second display module layer and the surface of the back plate.

7. The method for forming a middle frame of a display device according to any one of claims 1 to 6, characterized in that: The middle frame material includes a first glue for forming an anti-overflow wall and a second glue for printing and filling; the viscosity of the first glue is greater than the viscosity of the second glue; the first glue is conformal and the second glue is fluid.

8. The method for forming a middle frame of a display device according to claim 1, wherein: In the step of printing the middle frame, the printing method includes direct writing printing, piezoelectric valve printing, needle 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 printing device, suitable for performing 3D printing on a printing substrate to form a middle frame; the printing substrate comprises a back plate, a display module layer and a cover plate which are stacked and have the same curvature and are curved or flat; the edge of the display module layer and the edge of the cover plate are indented inwardly compared with the edge of the back plate; the printing substrate comprises an edge area, the edge area is an area of ​​a certain width from the edge of the back plate, the edge of the display module layer and the edge of the cover plate to the center of the printing substrate; The curvature of the printing substrate in the edge area is greater than that in the non-edge area; characterized in that: The printing device comprises: A carrier, suitable for carrying the printing substrate; A printing unit, adapted to print a middle frame material in the edge region to form a middle frame whose curvature matches the edge region; the printing unit comprises a print head; A bracket, suitable for installing the printing unit; the bracket is also provided with a five-axis linkage assembly connected to the print head, the five-axis linkage assembly adjusts the orientation angle and position of the print head, and the edge of the edge area away from the center position of the printing substrate and the edge of the edge area close to the center position of the printing substrate form a first anti-overflow wall and a second anti-overflow wall; A driving unit, adapted to drive the bracket to move, so as to drive the printing unit to move; the driving unit is a variable speed driving device; The numerical control unit is suitable for controlling the driving unit to drive the bracket to drive the printing unit to move and drive the five-axis linkage assembly to drive the printing head to move and rotate.

11. The printing device according to claim 10, characterized in that: The five-axis linkage assembly includes a planar moving assembly and a rotating assembly; The plane moving assembly is suitable for driving the print head to move in three orthogonal planes; The rotating assembly is suitable for driving the print head to rotate along a certain rotation axis in two planes among the three orthogonal planes.

12. The printing device according to claim 11, characterized in that: The five-axis linkage assembly includes: an X-axis moving assembly, a Y-axis moving assembly, a Z-axis moving assembly, an A-axis rotating assembly, and a C-axis rotating assembly; wherein the X-axis and the Y-axis are perpendicular to each other in a horizontal plane, the Z-axis is perpendicular to the XY plane, the A-axis is a rotating axis for driving the print head to rotate in the XY plane, and the C-axis is a rotating axis for driving the print head to rotate in the XZ plane; The numerical control unit is suitable for driving the X-axis moving assembly, the Y-axis moving assembly, the Z-axis moving assembly, the A-axis rotating assembly and the C-axis rotating assembly to drive the print head to move and rotate.

13. The printing device according to claim 10, characterized in that: The printing unit includes an anti-overflow wall printing unit and a filling glue printing unit; The anti-overflow wall printing unit includes one or more anti-overflow wall printing heads; the anti-overflow wall printing heads are connected to the five-axis linkage assembly; The filling glue printing unit includes a filling glue printing head, and the filling glue printing head is separately connected to the five-axis linkage assembly.

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