Middle frame structure, preparation method thereof and display device

Abstract

The invention discloses a middle frame structure, a preparation method thereof and a display device, and belongs to the technical field of electronic equipment production and manufacturing. The middle frame structure comprises a retaining wall and a filling part, the filling part comprises a first filling part and a second filling part which are in laminated contact, and the contact surface of the first filling part and the second filling part is an inclined surface; the first filling part is provided with an inclined upper surface and a lower surface in contact with the substrate, the upper surface of the first filling part is in contact with the lower surface of the second filling part, and the upper surface of the second filling part is in the horizontal direction. Compared with the prior art, the width of the middle frame structure assembly is greatly reduced, and the screen-to-body ratio of existing display equipment can be remarkably increased; meanwhile, the middle frame structure is tightly attached to the display module, no gap exists in the filling part, and the product yield and reliability can be effectively improved; the preparation method is simple and efficient, can be suitable for display products of any specification, does not need any mold for auxiliary production, is good in universality, and reduces the process cost and the development time.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic device manufacturing, and particularly relates to a middle frame structure, a preparation method thereof, and a display device. Background Art

[0002] As a device capable of providing an image display function, a display module is widely used in various display devices. In order to improve the stability and impact resistance of the display device and further narrow the border, a resin middle frame is usually prepared at present to play a role in waterproofing, dustproofing, and supporting and protecting.

[0003] The existing preparation methods of the middle frame mainly include integral injection molding and 3D printing.

[0004] For the integral injection molding resin middle frame solution, its technical feature is to directly make a mold on the display module and then introduce materials for injection molding. This method can achieve the technical effect of narrowing the border of the display screen. In addition, it can also be used to enhance the structural strength of the flexible display panel in the display module. However, on the one hand, for the injection molding solution used in the display module, in order to form a closed injection cavity, the mold itself has a thickness effect. When the injection mold extrudes the display module, it is impossible to form an extremely narrow border printing, which affects the user experience; on the other hand, the integral injection molding middle frame requires the use of a mold for auxiliary production. For different product specifications, the mold needs to be replaced, and the versatility is poor, which lengthens the sample development cycle and is easily affected by design changes, resulting in the scrapping of the developed mold and increasing the sample development cost.

[0005] 3D printing resin middle frame solution, its technical feature is directly printing the resin middle frame on the display module, which is divided into bank (retaining wall) and filling printing, and various printing schemes can be realized. For example, Patent CN 116787774A discloses a middle frame manufacturing method, device and 3D printing equipment for a display module. The middle frame is manufactured by using the 3D printing equipment. The middle frame manufacturing method includes: obtaining a first printing path of the middle frame, and printing a first middle frame body on the display module according to the first printing path; obtaining a second printing path of the middle frame based on the first printing path, and printing a second middle frame body on the display module according to the second printing path; obtaining a third printing path of the middle frame based on the second printing path, and printing a third middle frame body on the display module according to the third printing path; curing the first middle frame body, the second middle frame body and the third middle frame body to form the middle frame. Another example is Patent CN 116916518A which discloses a bending area filling protection structure for electronic products and its manufacturing method. The manufacturing method includes: Step 1, obtaining an electronic product to be filled, the bending area of the electronic product to be filled includes a base and a bending component, one end of the bending component is fixed to the base, and the other end bends upward, and the bending angle is greater than or equal to 180 degrees; Step 2, setting an inner support structure in the bending area, the inner support structure is arranged on the upper surface of the upward bending area of the bending component, and then completely bending the bending component so that its side contacts the inner support structure and is shaped; Step 3, using 3D printing to manufacture a first retaining wall and a second retaining wall on the end of the substrate after the bending component is bent and the upper surface of the upper part of the bending component above the inner support structure; Step 4, using 3D printing to manufacture a central filling unit between the first retaining wall and the second retaining wall. However, due to the increasing requirement of continuously narrowing the lower border of display devices such as mobile phones and wearable products, at the same time, considering the limitation of the aspect ratio of the material and the requirement of production efficiency, the printing width of the retaining wall cannot be extremely narrowed, and a gap needs to be left for the filling process, so an extremely narrow border cannot be achieved. If the existing process is used to prepare an extremely narrow border, it is inevitable that the filling material cannot flow to the bottom of the substrate due to the narrow reserved width of the filling part, resulting in holes or voids inside the product.

[0006] Therefore, there is an urgent need to provide an extremely narrow middle frame structure, its preparation method and a display device. Summary of the Invention

[0007] The main purpose of the present invention is to provide a middle frame structure, its preparation method and a display device, so as to solve the technical problem that voids are easily formed in the filling part when the existing technology uses a conventional scheme to prepare an extremely narrow border.

[0008] In the first aspect, the present invention provides a middle frame structure, including a retaining wall and a filling part. The filling part includes a first filling part and a second filling part that are stacked and in contact with each other, and the contact surface between the two is an inclined surface.

[0009] Further, the first filling portion has an upper surface disposed obliquely and a lower surface in contact with the substrate. The upper surface of the first filling portion is in contact with the lower surface of the second filling portion, and the upper surface of the second filling portion is in a horizontal direction.

[0010] Further, the upper surface of the first filling portion forms an inclination angle α with the horizontal direction, where 0° < α < 90°.

[0011] Further, the filling portion is filled in the region between the retaining wall and the bending area of the display module.

[0012] Further, the second filling portion is disposed above the first filling portion.

[0013] Further, the first filling portion and the second filling portion are made of the same material.

[0014] Further, the contact surface between the first filling portion and the second filling portion is an inclined plane or an arc surface.

[0015] Further, both the retaining wall and the filling portion are provided on the substrate of the display module.

[0016] Further, the middle frame structure is a 3D printed middle frame structure.

[0017] In a second aspect, the present invention provides a method for preparing a middle frame structure, the method comprising:

[0018] Providing a retaining wall and a filling portion, the filling portion comprising a first filling portion and a second filling portion in stacked contact, and the contact surface between the two being an inclined surface.

[0019] Further, the method for providing the retaining wall and the filling portion comprises:

[0020] Rotating the display module so that the accommodation space formed between the substrate and the bending area of the display module faces upward, filling a filling material in the accommodation space and curing it to form the first filling portion;

[0021] Rotating the display module again to return it to its original horizontal position, and printing a retaining wall on the side of the first filling portion;

[0022] Filling a second filling portion between the retaining wall and the bending area of the display module.

[0023] Further, the middle frame structure is prepared by using a 3D printing device, and the retaining wall is in partial contact with the side of the first filling portion or in contact with the vertex of the inclination angle of the first filling portion.

[0024] In a third aspect, the present invention provides a display device, which comprises a display module and the middle frame structure as described above.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The width of the middle frame structure is extremely narrow, specifically ≤220μm, and the narrowest width can be 150μm or less, breaking through the minimum width of the middle frame structure that can be achieved by conventional 3D printing; the width of the retaining wall can be ≤200μm, and the width of the filling part can be ≤20μm; the present invention divides the filling part of the middle frame structure into a first filling part and a second filling part, and the first filling part has an upper surface arranged obliquely and a lower surface in contact with the substrate, the upper surface of the first filling part contacts the lower surface of the second filling part, and the upper surface of the second filling part is in a horizontal direction, thereby effectively narrowing the width of the existing middle frame structure component, which is beneficial for the existing display device to significantly improve the screen-to-body ratio;

[0027] (2) The middle frame structure fits tightly with the display module, and there is no gap in the filling part; the first filling part of the middle frame structure of the present invention completely covers the substrate below it, and the upper surface of the first filling part is designed as an inclined surface structure for filling the second filling part, and the second filling part will not produce any gaps or holes during the filling process, which can effectively improve the product yield and reliability;

[0028] (3) The preparation method is simple and efficient. The present invention uses 3D printing to first fill and solidify the first filling part on the display module, then provides a retaining wall to achieve enclosure, and finally completes the filling of the second filling part above the first filling part. It can be applied to display products of any specifications and does not require any mold to assist in production. It has good versatility and greatly reduces process costs and development time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the integral injection-molded resin middle frame;

[0030] Figure 2 It is a side view of the display module product structure;

[0031] Figure 3 A schematic diagram showing the position of the module product after rotation;

[0032] Figure 4 It is a schematic diagram of the structure of the display module product after the first filling part is filled;

[0033] Figure 5 This is a schematic diagram of the structure of the display module product after the retaining wall is printed;

[0034] Figure 6 It is a schematic diagram of the structure of the display module product after the second filling part is filled;

[0035] Figure 7 This is a schematic diagram of the structure of printing a middle frame of the same width using a conventional 3D printing method.

[0036] The reference numerals in the figure are: 1 - retaining wall, 2 - first filling part, 3 - second filling part. Detailed implementation manners

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, rather than all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0038] As described in the background art section of the present invention, the existing preparation methods for the middle frame mainly include integral injection molding and 3D printing. For the integral injection molding resin middle frame solution, its technical feature is to directly make a mold on the display module and then introduce materials for injection molding, as Figure 1 shown. However, on the one hand, for the injection molding solution used in the display module, in order to form a closed injection cavity, the mold itself has a thickness effect. While the injection mold extrudes the display module, it is impossible to form an extremely narrow bezel printing, which affects the user experience; on the other hand, the integral injection molding middle frame requires the use of molds for auxiliary production. For different product specifications, the molds need to be replaced, with poor versatility, which prolongs the sample development cycle and is easily affected by design changes, resulting in the scrapping of the developed molds and increasing the sample development cost. For the 3D printing resin middle frame solution, its technical feature is to directly print the resin middle frame on the display module, which is divided into the printing of the retaining wall and the filling part. However, due to the gradually increasing requirement for the continuous narrowing of the lower bezel of current display devices such as mobile phones and wearable products, at the same time, considering the limitations of the aspect ratio of the material and the requirements of production efficiency, the printing width of the retaining wall cannot be extremely narrowed, and a gap needs to be left for the filling process, making it impossible to achieve an extremely narrow bezel. If the existing process is used to prepare an extremely narrow bezel, it will inevitably cause the problem that the filling material cannot flow to the bottom of the substrate due to the relatively narrow reserved width of the filling part, resulting in holes or voids inside the product.

[0039] In view of this, in the first aspect of the present invention, a middle frame structure is provided, including a retaining wall and a filling part, and the filling part includes a first filling part and a second filling part that are stacked and in contact, and the contact surface between the two is an inclined surface.

[0040] In an embodiment of the present invention, the first filling part has an inclined upper surface and a lower surface in contact with the substrate, the upper surface of the first filling part is in contact with the lower surface of the second filling part, and the upper surface of the second filling part is in a horizontal direction.

[0041] In one embodiment of the present invention, the upper surface of the first filling portion forms an inclination angle α with the horizontal direction, where 0° < α < 90°, and the preferred angle is between 30° and 60°; within this range, the first filling portion can level and infiltrate better in the inclined direction, and at the same time, it is not easy to cause abnormalities such as glue overflow.

[0042] In one embodiment of the present invention, the filling portion is filled in the area between the retaining wall and the bending area of the display module without gaps. The filling portion is composed of a first filling portion and a second filling portion, which are arranged in the area between the retaining wall and the bending portion of the display module. The first filling portion and the second filling portion are closely attached, and there are no gaps at the contact surface.

[0043] In one embodiment of the present invention, the second filling portion is arranged above the first filling portion. The first filling portion completely covers the substrate below it, and the upper surface of the first filling portion is designed as an inclined surface structure. The reserved space above it is used to fill the second filling portion, and no gaps or holes will be generated during the filling process of the second filling portion, which can effectively improve the product yield and reliability.

[0044] In one embodiment of the present invention, the first filling portion and the second filling portion are made of the same material.

[0045] In one embodiment of the present invention, the contact surface between the first filling portion and the second filling portion is an inclined plane or an arc surface.

[0046] In one embodiment of the present invention, both the retaining wall and the filling portion are arranged on the substrate of the display module.

[0047] In one embodiment of the present invention, the middle frame structure is a 3D printed middle frame structure.

[0048] The second aspect of the present invention provides a preparation method for a middle frame structure, which includes:

[0049] Providing a retaining wall 1 and a filling portion, where the filling portion includes a first filling portion 2 and a second filling portion 3 in stacked contact, and the contact surface between the two is an inclined surface.

[0050] Further, the method for providing the retaining wall 1 and the filling portion includes:

[0051] Rotating the display module so that the accommodation space formed between the display module substrate and the bending area of the display module faces upward, filling the accommodation space with a filling material and curing it to form a first filling portion 2; always keep the state of the display module unchanged after rotation during curing, and wait until the filling material of the first filling portion 2 is completely cured before proceeding to the next step; the inclination angle of the inclined surface of the first filling portion 2 is the rotation angle;

[0052] Rotate the display module again to return it to its original horizontal position, and print the retaining wall 1 on the side of the first filling portion 2; the retaining wall 1 is in partial contact with the side of the first filling portion 2 or in contact with the vertex of the inclination angle of the first filling portion 2.

[0053] Keep the display module in a horizontal position, and fill the second filling portion 3 between the retaining wall 1 and the bending area of the display module. The upper surface of the solidified second filling portion 3 is parallel to the substrate and does not exceed the height of the retaining wall 1.

[0054] Furthermore, the middle frame structure is prepared by using a 3D printing device.

[0055] In the present invention, the first filling portion 2 is first filled and solidified on the display module by 3D printing, then the retaining wall 1 is provided to achieve enclosure, and finally the second filling portion 3 is filled above the first filling portion 2. It can be applied to display products of any specification without the need to provide any mold for auxiliary production, has good versatility, is simple and efficient in preparation, and reduces the process cost and development time.

[0056] The third aspect of the present invention provides a display device, which includes the middle frame structure and the display module as described above. The display module includes a substrate and a flexible circuit board (FPC) fixed on the substrate. The FPC includes a bending area and a non-bending area. The middle frame structure is closely attached to the display module, and there is no gap in the filling part, meeting the product quality requirements.

[0057] In a specific embodiment, the preparation method of the middle frame structure of the present invention includes:

[0058] (1) Select a suitable glue material according to the size of the resin middle frame to be printed, and the same type of glue material is used for both the retaining wall and the filling portion. The glue material includes but is not limited to thermosetting glue (epoxy glue DP760, DP421, etc.), UV glue (6023, 1020, etc.), etc. The viscosity of the glue material used for the retaining wall is 800000 - 1500000 cp, and the viscosity of the glue material used for the filling portion is 100 - 1000 cp; after configuration, it is loaded into the cartridge and installed on the 3D printing device;

[0059] (2) Select a suitable printing needle (including but not limited to ceramic needle, steel needle, etc.) according to the characteristics of the configured material in step (1) and the size of the middle frame to be printed, and install it on the printing device;

[0060] (3) Place the display module to be printed on the vacuum adsorption platform of the 3D printing device, and turn on the vacuum adsorption to improve the overall flatness of the display module substrate. The schematic side view of the product is as Figure 2 shown;

[0061] (4) Perform mark positioning or edge grabbing positioning on the display module through the vision system to complete the plane calibration;

[0062] (5) Rotate the display module by an angle α around the rotation axis to become the Figure 3 sample position in (the rotation angle < 90°);

[0063] (6) Control the material discharge through the discharging module, and print the filling material on the display module, such as Figure 4 , and wait for the filling material to fully cure;

[0064] (7) Then rotate the product obtained in step (6) back to the horizontal spatial position as shown in Figure 2 , control the material discharge through the discharging module, and print the retaining wall material on the display module, such as Figure 5 ;

[0065] (8) After completing the retaining wall printing, perform the filling part printing again, such as Figure 6 ;

[0066] (9) Cure the printed product to obtain the protective resin middle frame structure.

[0067] Example 1

[0068] The middle frame structure of this example includes a retaining wall and a filling part. The filling part includes a first filling part and a second filling part that are stacked and in contact, and the contact surface between the two is an inclined surface. The steps for preparing the middle frame structure in this example are as follows:

[0069] (1) Select the UV glue (V - 4260) according to the size of the resin middle frame to be printed; after configuration, load it into a 30 mL cartridge and install it on the 3D printing device;

[0070] (2) Install a ceramic printing needle with an inner diameter of 300 μm on the 3D printing device and wipe the needle;

[0071] (3) Automatically load the substrate in the loading area, start the automation software, turn on the vacuum pump to automatically adsorb the substrate, the suction cup automatically transfers to the printing station, and achieve automatic mechanical zeroing alignment and leveling adjustment;

[0072] (4) Perform edge grabbing and positioning on the display module to be printed through the vision system;

[0073] (5) Wipe the needle, rotate the rotation axis by an angle α (α = 45°), and perform scanning compensation on the substrate;

[0074] (6) According to the computer vision algorithm, automatically adjust the distance between the needle and the substrate, obtain the substrate flatness data, adjust the printing height to ensure that the distance between the needle and the substrate remains consistent during the printing process; perform the filling part printing, and obtain the first filling part after the filling material is fully cured;

[0075] (7) Switch the needle, and at the same time rotate the rotating shaft by an angle α to return the product to its original horizontal position. Perform the dam printing according to the actual sample by importing the printing path and printing parameters (printing air pressure, printing speed, etc.);

[0076] (8) After completing the dam printing, switch the needle and then perform the secondary filling part printing;

[0077] (9) Cure the printed product. After curing, use a vision camera to observe and confirm the printing morphology, and measure the size of the printed middle frame;

[0078] (10) Obtain an extremely narrow resin middle frame structure with a width of 200 μm.

[0079] Example 2

[0080] The middle frame structure of this example includes a dam and a filling part. The filling part includes a first filling part and a second filling part that are stacked and in contact, and their contact surface is an inclined surface. The steps for preparing the middle frame structure in this example are as follows:

[0081] (1) Select a UV type glue (V-4260) according to the size of the resin middle frame to be printed; after configuration, load it into a 30 mL cartridge and install it on a 3D printing device;

[0082] (2) Install a ceramic printing needle with an inner diameter of 300 μm on the 3D printing device and wipe the needle;

[0083] (3) Automatically load the substrate in the loading area, start the automation software, turn on the vacuum pump to automatically adsorb the substrate, the suction cup automatically transfers to the printing station, and achieve automatic mechanical zeroing alignment and leveling adjustment;

[0084] (4) Use the vision system to perform edge grabbing and positioning on the display module to be printed;

[0085] (5) Wipe the needle, rotate the rotating shaft by an angle α (α = 30°), and perform scanning compensation on the substrate;

[0086] (6) According to the computer vision algorithm, automatically adjust the distance between the needle and the substrate, obtain the substrate flatness data, adjust the printing height to ensure that the distance between the needle and the substrate remains consistent during printing; perform the filling part printing, and wait for the filling material to fully cure to obtain the first filling part;

[0087] (7) Switch the needle, and at the same time rotate the rotating shaft by an angle α to return the product to its original horizontal position. Perform the dam printing according to the actual sample by importing the printing path and printing parameters (printing air pressure, printing speed, etc.);

[0088] (8) After completing the dam printing, switch the needle and then perform the secondary filling part printing;

[0089] (9) Cure the printed product. After curing, use a vision camera to observe and confirm the printing morphology, and test the size of the printed middle frame.

[0090] (10) Obtain an extremely narrow resin middle frame structure with a width of 220 μm.

[0091] Example 3

[0092] The middle frame structure of this example includes a retaining wall and a filling part. The filling part includes a first filling part and a second filling part in stacked contact, and their contact surface is an inclined plane. The steps to prepare the middle frame structure in this example are as follows:

[0093] (1) Select UV glue (V-4260) according to the size of the resin middle frame to be printed; after configuration, load it into a 30 mL cartridge and install it on a 3D printing device.

[0094] (2) Install a ceramic printing needle with an inner diameter of 300 μm on the 3D printing device and wipe the needle.

[0095] (3) The substrate in the loading area is automatically loaded. Start the automation software, the vacuum pump starts to automatically adsorb the substrate, the suction cup automatically transfers to the printing station, and automatic mechanical zeroing alignment and leveling adjustment are achieved.

[0096] (4) Use the vision system to perform edge grabbing and positioning on the display module to be printed.

[0097] (5) Wipe the needle, rotate the rotating shaft by an angle α (α = 60°), and perform scanning compensation on the substrate.

[0098] (6) According to the computer vision algorithm, automatically adjust the distance between the needle and the substrate, obtain the substrate flatness data, adjust the printing height to ensure that the distance between the needle and the substrate remains consistent during printing; perform printing of the filling part, and wait for the filling material to fully cure to obtain the first filling part.

[0099] (7) Switch the needle, and at the same time rotate the rotating shaft back by an angle α to make the product return to its original horizontal position. According to the actual sample, import the printing path and printing parameters (printing air pressure, printing speed, etc.) to perform the retaining wall printing.

[0100] (8) After completing the retaining wall printing, switch the needle and perform secondary filling part printing.

[0101] (9) Cure the printed product. After curing, use a vision camera to observe and confirm the printing morphology, and test the size of the printed middle frame.

[0102] (10) Obtain an extremely narrow resin middle frame structure with a width of 150 μm.

[0103] Comparative Example

[0104] The middle frame structure of this comparative example includes a retaining wall and a filling part. The filling part is an integral body and is arranged in the area between the retaining wall and the bending area of the display module. This comparative example uses a conventional 3D printing method to prepare the middle frame structure, and the steps are as follows:

[0105] (1) Select a UV-type glue (V-4260) according to the size of the resin middle frame to be printed (the same as in the embodiment); after configuration, it is loaded into a 30 mL cartridge and installed on a 3D printing device;

[0106] (2) Install a ceramic printing needle with an inner diameter of 300 μm on the 3D printing device and wipe the needle;

[0107] (3) The substrate in the feeding area is automatically fed. Start the automation software, the vacuum pump is turned on to automatically adsorb the substrate, the suction cup automatically transfers to the printing station, and automatic mechanical zeroing alignment and leveling adjustment are realized;

[0108] (4) Use the vision system to perform edge grabbing and positioning on the display module to be printed;

[0109] (5) Import the printing path and printing parameters (printing air pressure, printing speed, etc.) according to the actual sample and start printing the retaining wall;

[0110] (6) After completing the printing of the retaining wall, switch the needle to print the filling part, and control the widths of the retaining wall and the filling part to be the same as those in Example 1;

[0111] (7) Cure the printed product. After curing, use a vision camera to observe and confirm the printing morphology, and test the size of the printed middle frame;

[0112] (8) Obtain the resin middle frame structure.

[0113] As Figure 7 shown, obvious voids appear in the filling part of the resin middle frame structure obtained in this comparative example. This is because when printing an extremely narrow middle frame structure, the distance between the retaining wall and the bending area of the display module is too close, and the filling material usually has a certain viscosity and is difficult to flow smoothly through the narrow space to the bottom of the substrate; in addition, the 3D printing needle also has a pore diameter, and according to the current printing accuracy, it is still impossible to control the 3D printing needle to directly extend under the retaining wall and the bending area of the display module to print the filling material. Therefore, there are significant technical obstacles to overcome in manufacturing an extremely narrow middle frame structure in the prior art.

[0114] In summary, the middle frame structure width of the present invention can be extremely narrow. The width of the retaining wall and the filling part is ≤220 μm, and the narrowest can reach 150 μm and below. Among them, the width of the retaining wall can reach ≤200 μm, and the filling part can reach ≤20 μm, breaking through the minimum width of the middle frame structure that can be achieved by current conventional 3D printing. By dividing the filling part of the middle frame structure into a first filling part and a second filling part, with the upper surface of the first filling part being inclined and the lower surface being in contact with the substrate, and the upper surface of the first filling part being in contact with the lower surface of the second filling part, and the upper surface of the second filling part being horizontal, the width of the existing middle frame structure component is effectively narrowed, which is conducive to significantly improving the screen-to-body ratio of existing display devices. Secondly, the middle frame structure of the present invention is closely attached to the display module, and there are no gaps in the filling part. The first filling part of the above middle frame structure completely covers the substrate below it, and the upper surface of the first filling part is designed as an inclined surface structure for filling the second filling part, and no gaps or holes are generated during the filling process of the second filling part, which can effectively improve the product yield and reliability. In addition, the middle frame preparation method provided by the present invention is simple and efficient. By using 3D printing to first complete the filling and curing of the first filling part on the display module, then provide a retaining wall for enclosing, and finally complete the filling of the second filling part above the first filling part, it can be applied to display products of any specification without the need for any mold-assisted production, with good versatility, simple and efficient preparation, reducing the process cost and development time.

[0115] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0116] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0117] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the present invention.

Claims

1. A middle frame structure, comprising a retaining wall and a filling part, characterized in that: The filling part includes a first filling part and a second filling part which are in stacked contact, and the contact surfaces of the first filling part and the second filling part are inclined surfaces.

2. The middle frame structure according to claim 1, characterized in that: The first filling portion has an inclined upper surface and a lower surface in contact with the substrate. The upper surface of the first filling portion is in contact with the lower surface of the second filling portion. The upper surface of the second filling portion is in a horizontal direction.

3. The middle frame structure according to claim 1, characterized in that: The upper surface of the first filling portion forms an inclination angle with the horizontal direction, and the inclination angle is an acute angle.

4. The middle frame structure according to claim 1, characterized in that: The filling portion fills the area between the retaining wall and the display module bending area.

5. The middle frame structure according to claim 1, characterized in that: The contact surface is an inclined plane or a curved surface.

6. The middle frame structure according to claim 1, characterized in that: The retaining wall and the filling part are both arranged on the substrate of the display module.

7. A method for preparing a middle frame structure, characterized in that: The method includes: A retaining wall and a filling portion are provided. The filling portion includes a first filling portion and a second filling portion that are in stacked contact, and the contact surfaces of the two are inclined surfaces.

8. The method for preparing the middle frame structure according to claim 7, characterized in that: The method for providing a retaining wall and a filling portion comprises: Rotating the display module so that the receiving space formed between the substrate and the bending area of ​​the display module is arranged upward, and filling the receiving space with a filling material and curing it to form a first filling portion; Rotate the display module again to return it to its original horizontal position, and print the retaining wall on the side of the first filling part; A second filling portion is filled between the retaining wall and the display module bending area.

9. The method for preparing the middle frame structure according to claim 7, characterized in that: The middle frame structure is prepared by using 3D printing equipment.

10. A display device, characterized in that: It comprises a display module and the middle frame structure described in any one of claims 1-6.

Images