Injection mold and injection molding method of display module

Abstract

The invention provides an injection mold and an injection molding method of a display module. The injection mold comprises an upper mold, a lower mold and an inner mold. The lower die is configured to be assembled with the upper die into an integrated structure, and a first cavity is formed in the integrated structure. And the inner mold is located in the first cavity and located on the side, facing the first cavity, of the upper mold, an injection molding runner is arranged on the side, facing the first cavity, of the inner mold, the injection molding runner comprises a special-shaped part, and the special-shaped part is configured to do reciprocating motion in the direction facing the first cavity. When the injection mold is applied to injection molding, the problem of glue overflow or impressions caused by the sealing performance problem can be solved, and the problems of the injection molding process in the production of display devices are solved.

Description

Technical Field

[0001] The present disclosure relates to the field of display module molding, and in particular, to an injection mold and an injection molding method for a display module. Background Art

[0002] Injection molding, also known as injection molding, is the most commonly used method in plastic processing and is widely used in various fields. For example, injection molding is widely used in multiple links of display devices and plays an important role in the production and manufacturing of display devices. At present, in order to meet the ever-evolving performance requirements of display devices, it is urgent to improve and optimize the injection molding process to improve the problems existing in the injection molding process in the production of display devices. Summary of the invention

[0003] The present disclosure provides an injection mold and an injection molding method for a display module. By designing the injection mold, the sealing effect of the injection mold on the special-shaped area of ​​the injection molded part is improved, thereby improving the problems existing in the injection molding process in the production of the display device.

[0004] The first aspect of the present disclosure provides an injection mold, which includes an upper mold, a lower mold and an inner mold. The lower mold is configured to be assembled with the upper mold into an integral structure, and a first cavity is provided in the integral structure. The inner mold is located in the first cavity and is located on the side of the upper mold facing the first cavity. An injection runner is provided on the side of the inner mold facing the first cavity, and the injection runner includes a special-shaped portion, and the special-shaped portion is configured to reciprocate in the direction of the first cavity.

[0005] In the above scheme, the special-shaped portion in the injection mold can move toward the first cavity during injection molding, thereby forming a reliable sealing structure with the special-shaped area of ​​the injection molded part, improving the problem of glue overflow or imprinting caused by sealing problems during injection molding.

[0006] In a specific embodiment of the first aspect of the present disclosure, the inner mold includes a substrate and a sealing ring. The substrate is arranged on the side of the upper mold facing the first cavity; the sealing ring includes a first sealing ring, a second sealing ring and a bottom surface, the first sealing ring is arranged around the substrate, the second sealing ring is arranged around the substrate and is away from the periphery of the substrate, the bottom surface is located on the substrate, arranged around the substrate and connected to the first sealing ring and the second sealing ring to form an injection flow channel; the part of the second sealing ring corresponding to the special-shaped portion is configured to reciprocate in the direction toward the first cavity.

[0007] In the above scheme, by limiting the structure of the inner mold, the sealing of the injection channel formed by the subsequent injection flow channel and the sealing between the second sealing ring of the inner mold and the special-shaped area of ​​the part to be injected are improved, thereby improving the injection stability and injection effect.

[0008] In a specific embodiment of the first aspect of the present disclosure, a second cavity is provided at a portion of the second sealing ring corresponding to the special-shaped portion, and a volume of the second cavity is configured to be variable.

[0009] In the above solution, the corresponding partial movement of the second sealing ring is achieved by designing the volume change of the second cavity provided in the second sealing ring. This design has a simple structure, is easy to process, and saves production costs.

[0010] Optionally, the first sealing ring and the second sealing ring are respectively silicone sealing rings, and the bottom surfaces are silicone layers.

[0011] In a specific embodiment of the first aspect of the present disclosure, the second cavity is a closed cavity, and a cross-sectional shape of the second cavity in a direction perpendicular to the thickness of the substrate is either a triangle or a rectangle.

[0012] In the above solution, the second cavity has a diverse structure, which not only facilitates processing but also improves the applicability of the injection mold.

[0013] In a specific embodiment of the first aspect of the present disclosure, a cross-sectional shape of the second cavity in a direction perpendicular to the thickness of the substrate is an irregular shape.

[0014] In the above solution, the second cavity is arranged to be an irregular structure, which can effectively improve the sealing effect of the injection mold on the special-shaped area of ​​the injection molded part, thereby improving the injection molding stability and injection molding effect.

[0015] Optionally, the irregular pattern includes a first portion, a second portion and a transition portion, the first portion extends along the thickness direction of the substrate, the second portion extends along the length direction of the substrate, and the transition portion is used to connect the first portion and the second portion.

[0016] Optionally, the cross-sectional shape of the transition portion in a direction perpendicular to the thickness of the substrate is an arc tube shape.

[0017] In a specific embodiment of the first aspect of the present disclosure, the second cavity is an open cavity, and the second cavity includes a main cavity and an open channel connected to the main cavity, and the open channel realizes communication between the main cavity and the outside.

[0018] In the above scheme, the second cavity of the injection mold can be arranged in a variety of schemes, thereby improving the applicability of the injection mold and improving its applicability.

[0019] Optionally, the angle between the opening channel and the main cavity is a right angle.

[0020] Optionally, a cross-sectional shape of the main cavity in a direction perpendicular to the thickness of the substrate is a rectangle with an opening.

[0021] In a specific embodiment of the first aspect of the present disclosure, at least one glue injection port and at least one glue discharge port are provided on the substrate, and the glue injection port and the glue discharge port are respectively connected to the injection flow channel;

[0022] Optionally, a plurality of glue injection ports and glue discharge ports are provided, and the plurality of the two ports are alternately distributed;

[0023] Optionally, the orthographic projections of the glue injection port and the glue discharge port on the substrate fall on the injection flow channel respectively.

[0024] In the above scheme, the design scheme of the injection port and the discharge port can increase the pressure in the injection channel formed by the injection runner during injection, stabilize the flow rate of the injection glue in the injection channel, and thus improve the stability of injection molding.

[0025] In a specific embodiment of the first aspect of the present disclosure, at least one special-shaped portion of the injection molding runner is provided, and the injection molding runner also includes a connecting portion, and the connecting portion and the special-shaped portion are connected so that the orthographic projection of the injection molding runner on the substrate is a quasi-rectangular shape with arc angles.

[0026] Optionally, a group of glue injection ports and glue discharge ports arranged at intervals are respectively arranged in areas on the substrate corresponding to the long sides of the rectangular injection flow channel.

[0027] Optionally, in each group of glue injection ports and glue discharge ports, the distances between the glue injection ports and glue discharge ports are equal.

[0028] According to a second aspect of the present disclosure, there is provided a method for injection molding of a display module, which method comprises: obtaining a display module to be injected, wherein the area to be injected of the display module to be injected comprises a special-shaped area; obtaining an injection mold, wherein the injection mold comprises an upper mold, a lower mold and an inner mold, wherein the lower mold is configured to be assembled with the upper mold into an integral structure, wherein a first cavity is arranged in the integral structure, wherein the inner mold is located in the first cavity and is located on a side of the upper mold facing the first cavity, wherein an injection channel is arranged on a side of the inner mold facing the first cavity, wherein the injection channel comprises a special-shaped portion, wherein the special-shaped portion is configured to reciprocate in a direction toward the first cavity; placing the display module to be injected into the first cavity of the injection mold; moving the inner mold so that the injection channel of the inner mold cooperates with the area to be injected of the display module to form an injection channel; controlling the special-shaped portion to move and extrude the special-shaped area of ​​the display module to form a sealing structure; and injecting the injection molding glue into the injection channel.

[0029] In the above scheme, the display module to be injected is injected by the above injection molding method. During the injection molding process, the inner mold can extrude and fit the special-shaped area of ​​the area to be injected located on the inner side of the injection molding channel (relative to the periphery) to form a reliable sealing structure, thereby preventing the injection molding glue in the injection molding channel from overflowing to the special-shaped area of ​​the part to be injected, and also avoiding the problem of imprinting, so that the display module obtained after injection molding has a reliable structure and stable performance.

[0030] In a specific embodiment of the second aspect of the present disclosure, when forming the injection channel, the shaped portion of the inner mold corresponds to the shaped region of the display module, and there is a first gap between the shaped portion and the shaped region in a direction perpendicular to the display module, and there is a second gap in a direction parallel to the display module;

[0031] Optionally, the first gap is 0.5mm-0.8mm, and the second gap is 0.2mm-0.4mm.

[0032] In a specific embodiment of the second aspect of the present disclosure, the display module to be injection molded includes a display substrate and a bonding structure located on the display substrate, and the bonding structure forms a step-like structure with a side of the display substrate close to the periphery.

[0033] In the above scheme, the display module formed by the injection molding method can avoid the problem of marks or glue overflow caused by over-tight or loose sealing by applying dam glue on both sides of the bonding structure and pressing the dam glue to form a seal through the interference fit between the inclined surface of the injection mold and the dam glue.

[0034] Optionally, the bonding structure is a chip or a printed circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A top perspective view of an injection mold provided according to an embodiment of the present disclosure.

[0036] Figure 2 An embodiment of the present disclosure provides Figure 1 Cross-sectional view of the injection mold along the M1N1 direction.

[0037] Figure 3 A top view of an inner mold of an injection mold provided in one embodiment of the present disclosure.

[0038] Figure 4 An embodiment of the present disclosure provides Figure 2 An enlarged view of point A in one example.

[0039] Figure 5 An embodiment of the present disclosure provides Figure 1 A schematic cross-sectional diagram of the partial structure of the injection mold along the M2N2 direction when the injection mold is in use.

[0040] Figure 6 An embodiment of the present disclosure provides Figure 5 An enlarged view of point B in one example.

[0041] Figure 7 An embodiment of the present disclosure provides Figure 5 Another enlarged view of point B.

[0042] Figure 8Another embodiment of the present disclosure provides Figure 1 A schematic cross-sectional diagram of the partial structure of the injection mold along the M2N2 direction when the injection mold is in use.

[0043] Fig. 9 Another embodiment of the present disclosure provides Figure 1 A schematic cross-sectional diagram of the partial structure of the injection mold along the M2N2 direction when the injection mold is in use.

[0044] Fig.10 Another embodiment of the present disclosure provides Figure 1 A schematic cross-sectional diagram of the partial structure of the injection mold along the M2N2 direction when the injection mold is in use.

[0045] Fig.11 A top perspective view of an injection mold provided according to an embodiment of the present disclosure.

[0046] Fig.12 A top perspective view of an injection mold provided according to another embodiment of the present disclosure.

[0047] Fig.13 A schematic flow chart of an injection molding method for a display module provided in accordance with an embodiment of the present disclosure. Description of the drawings:

[0049] 100- upper mold;

[0050] 200-lower mold; 200a-first cavity;

[0051] 300-inner mold; 310-substrate; 310a-glass substrate; 311-glue injection port; 312-glue discharge port; 320-sealing ring; 321-first sealing ring; 322-second sealing ring; 322a-second cavity; 322b-main cavity; 322c-opening channel; 323-bottom surface; 330-irregular pattern; 331-first part; 332-second part; 333-transition part;

[0052] 400 - injection molding runner; 410 - special-shaped portion; 420 - connecting portion.

[0053] 500-Display module to be injected. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0055] In the process of manufacturing display devices, especially OLED (Organic Light-Emitting Diode) display devices, the injection molding process plays an important role. For example, for a rigid or flexible cover plate of an OLED display device, a layer of sealing material is injected at the edge of the cover plate by the injection molding process to achieve a tight seal between the cover plate and the OLED panel; for example, after the OLED display module is assembled, a sealing strip or sealing gasket is injected at the edge or specific position of the module by the injection molding process.

[0056] The following is a specific introduction to the problems that arise in the process of using four-side glue injection to ensure the sealing and reliability of the display module. In the presence of a printed circuit board (Flexible Printed Circuit), its thickness forms a distinct step-like structure with the adjacent copper foil (wiring in the display module). This makes it difficult to achieve uniform and effective sealing using conventional glue injection methods. If glue is injected directly, the colloid may flow unevenly in the step-like structure, resulting in a poor seal, and harmful substances such as external moisture and dust can easily invade the interior of the display module, affecting its performance and service life.

[0057] In order to solve this problem, the current method is to set a bevel on the silicone surface of the injection mold corresponding to the edge of the FPC, and apply dam glue on both sides of the FPC. The bevel can improve the flow path of the colloid, so that the colloid can cover the step area more smoothly during the injection process, and the dam glue forms a physical barrier on both sides of the FPC, limiting the flow range of the colloid and preventing the overflow of the colloid. At the same time, the interference fit between the bevel and the dam glue presses the dam glue and the FPC to form a seal, thereby avoiding glue overflow and improving the above-mentioned injection problems.

[0058] Despite the above measures, there are still some problems that need to be further resolved in actual production. For example, the angle and size of the bevel on the silicone surface of the injection mold need to be precisely controlled, otherwise it may not be possible to achieve a good interference fit with the dam glue, affecting the sealing effect. The dispensing position and amount of the dam glue also need to be strictly controlled. Inaccurate dispensing position or insufficient amount may lead to poor sealing, while excessive amount may cause colloid waste and other potential quality problems. In addition, the step-like structure at the junction of the FPC and the copper foil may have certain size differences due to fluctuations in the production process. These will have an adverse effect on the stability of the injection process, and there will be problems such as overflow due to the loose sealing between the dam glue and the FPC, or the dam glue and the FPC will be too tightly sealed, resulting in imprints.

[0059] In view of this, an embodiment of the present disclosure provides an injection mold and an injection molding method for a display module. The injection mold includes an upper mold, a lower mold and an inner mold. The lower mold is configured to be assembled with the upper mold into an integral structure, and a first cavity is provided in the integral structure. The inner mold is located in the first cavity and is located on the side of the upper mold facing the first cavity. An injection channel is provided on the side of the inner mold facing the first cavity, and the injection channel includes a special-shaped portion, and the special-shaped portion is configured to reciprocate in the direction of the first cavity. In this way, in the injection mold, by designing the injection runner of the inner mold, during injection molding, the special-shaped portion of the injection runner on the inner mold is controlled to move toward the first cavity, which can press the part to be injected in the first cavity, such as the display module to be injected, and form a seal with the structure of the display module to be injected, such as the stepped structure of the FPC, to avoid the colloid in the injection runner overflowing to the FPC side during injection molding, and by using the movement of the special-shaped portion to press the stepped structure of the FPC, the problem of imprinting due to over-tight sealing is avoided, thereby improving the problem of affecting the injection molding stability and injection molding effect due to tolerance problems.

[0060] In the following, the injection molding method of the injection mold and the display module according to at least one embodiment of the present disclosure is described in conjunction with the accompanying drawings. In addition, as shown in the accompanying drawings, in at least one embodiment of the present disclosure, a spatial rectangular coordinate system is established based on the surface where the injection mold is located to define the positions of various structures in the injection mold. In the spatial rectangular coordinate system, the X-axis and the Y-axis are parallel to the surface where the injection mold is located, and the Z-axis is perpendicular to the surface where the injection mold is located.

[0061] In an injection mold provided by one embodiment of the present disclosure, Figure 1 and Figure 2 As shown, the injection mold includes an upper mold 100, a lower mold 200 and a mold.

[0062] Specifically, the upper and lower molds 100 and 200 are relative to the fixed plate of the injection molding machine. The lower mold 200 is fixed on the fixed plate of the injection molding machine as a fixed mold, and the upper mold 100 is located above the lower mold 200 relative to the fixed plate of the injection molding machine as a movable mold. The upper mold 100 is installed on the movable template of the injection molding machine and can open and close the mold with the movable template. In the mold closing state, the upper mold 100 and the lower mold 200 are assembled into an integral structure, and together constitute a complete cavity, that is, the first cavity 200a set in the integral structure.

[0063] The inner mold 300 is located in the first cavity 200a and on the side of the upper mold 100 facing the first cavity 200a. Specifically, the inner mold 300 can be fixed on the side of the upper mold 100 facing the first cavity 200a, for example, the inner mold 300 is fixed on the upper mold 100 by threaded connection, welding, gluing, interference fit, etc. An injection runner 400 is provided on the side of the inner mold 300 facing the first cavity 200a. The injection runner 400 corresponds to the injection area of ​​the part to be injected, such as the display module to be injected, and is used to transport and distribute plastic melt, such as injection glue, to form a sealant after the injection glue is cooled and solidified, thereby completing the injection molding process of the display module 500 to be injected. The injection runner 400 includes a special-shaped portion 410, which corresponds to the special-shaped area of ​​the display module 500 to be injected, and the special-shaped portion 410 is configured to reciprocate in the direction toward the first cavity 200a. Thus, during injection molding, in the mold-closing state, the inner mold 300 contacts the display module 500 to be molded on the lower mold 200, the injection runner 400 of the inner mold 300 is sealed with the injection area of ​​the display module 500 to be molded to form an injection channel, and the shaped portion 410 corresponds to the shaped area of ​​the display module 500 to be molded. By controlling the movement of the shaped portion 410 to press the shaped area to form a seal, the injection glue is prevented from overflowing into the shaped area and affecting the injection molding effect. After the injection molding is completed, the shaped portion 410 is controlled to move away from the display substrate 310 to be molded.

[0064] It should be noted that the structure of the injection mold of the embodiment of the present disclosure is not limited to the above examples. For example, a platform or a fixed structure may be provided in the lower mold 200 to fix the part to be injected; for example, a guide structure or a positioning structure may be provided on the upper mold 100 and the lower mold 200 to improve the accuracy and efficiency of mold clamping. All of the above can be designed according to actual needs and will not be elaborated here.

[0065] Based on the above embodiments, the present disclosure also introduces the specific structure of the inner mold 300, as follows.

[0066] In an injection mold provided by an embodiment of the present disclosure, the inner mold 300 includes: a substrate 310 and a sealing ring 320. The substrate 310 is arranged on the side of the upper mold 100 facing the first cavity 200a. The sealing ring 320 includes a first sealing ring 321, a second sealing ring 322 and a bottom surface 323, the first sealing ring 321 is arranged around the substrate 310, the second sealing ring 322 is arranged around the substrate 310 and is away from the periphery of the substrate 310, the bottom surface 323 is located on the substrate 310, and is arranged around the substrate 310 and connects the first sealing ring 321 and the second sealing ring 322 to form an injection runner 400, and the portion of the second sealing ring 322 corresponding to the special-shaped portion 410 is configured to reciprocate in the direction toward the first cavity 200a.

[0067] For example, Figure 2 , Figure 3 and Figure 4 As shown, the substrate 310 is a glass substrate 310a, which is arranged on the side of the upper mold 100 facing the first cavity 200a and is fixed on the upper mold 100. The sealing ring 320 forming the injection flow channel 400 is arranged on the glass substrate 310a. The glass substrate 310a, as a carrier of the injection flow channel 400, has extremely high dimensional stability and surface flatness, and can provide a precise and stable channel environment for the flow of the plastic melt, which helps to ensure that the plastic melt maintains a uniform flow rate and pressure distribution during the flow process, thereby achieving high-precision injection molding. At the same time, the glass substrate 310a also has good thermal stability, and can maintain stable physical and chemical properties under high temperature environment during the injection molding process. The stable flow channel structure helps the plastic melt to cool evenly, reduce product defects caused by thermal deformation, and improve the stability of the injection molded product. In addition, the glass substrate 310a also has the advantages of easy cleaning and good chemical stability.

[0068] The sealing ring 320 disposed on the glass substrate 310a includes a bottom surface 323 disposed on the glass substrate 310a, and a first sealing ring 321 and a second sealing ring 322 extending along the bottom surface 323 away from the glass substrate 310a, that is, the bottom surface 323 is respectively connected to the first sealing ring 321 and the second sealing ring 322. The bottom surface 323 surrounds the glass substrate 310a to form a closed ring, and the corresponding first sealing ring 321 and the second sealing ring 322 also surround the glass substrate 310a to form a closed ring, and the first sealing ring 321 is relatively close to the periphery of the glass substrate 310a, and the second sealing ring 322 is relatively far from the periphery of the glass substrate 310a.

[0069] In this way, the bottom surface 323 and the first sealing ring 321 and the second sealing ring 322 connected to the bottom surface 323 constitute an injection channel 400 surrounding the glass substrate 310a. The injection channel 400 has a U-shaped cross-section perpendicular to the direction of the proportional substrate 310, and the U-shaped opening faces the first cavity 200a. During injection molding, the U-shaped opening contacts the area to be injected of the part to be injected to form an injection channel. The portion of the second sealing ring 322 corresponding to the special-shaped portion 410 is configured to make reciprocating motion in the direction of the first cavity 200a, that is, the special-shaped portion 410 of the second sealing ring 322, that is, the portion corresponding to the special-shaped area of ​​the area to be injected, can move toward the special-shaped area of ​​the part to be injected, such as the display module 500 to be injected, and finally extrude the special-shaped area to form a sealing structure, thereby preventing the injection glue of the second sealing ring 322 away from the side of the display module 500 to be injected, that is, the injection glue in the injection channel from overflowing into the special-shaped area in the display module 500 to be injected, such as the FPC step-shaped structure in the display module.

[0070] After defining the structure of the inner mold 300 in the injection mold, the embodiment of the present disclosure further specifically defines the structure of the sealing ring 320 in the inner mold 300 .

[0071] In an injection mold provided by one embodiment of the present disclosure, Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the portion of the second sealing ring 322 corresponding to the shaped portion 410 is provided with a second cavity 322a, and the volume of the second cavity 322a is configured to be variable. By controlling the volume change of the second cavity 322a, the portion of the second sealing ring 322 corresponding to the shaped portion 410 is moved closer to or away from the first cavity 200a, i.e., the shaped area of ​​the display module 500 to be injected, such as the FPC step-shaped structure in the display module.

[0072] In the injection mold provided by at least one embodiment of the present disclosure, the surface of the second sealing ring 322 close to the shaped area of ​​the display module 500 to be injected is adapted to the structure of the shaped area. For example, in the case where the shaped area of ​​the display module 500 to be injected is a step-shaped structure, the surface of the second sealing ring 322 close to the shaped area of ​​the display module 500 to be injected is also a shaped surface with a step-shaped structure, and has an inclined surface to facilitate the subsequent compression of the side of the step-shaped structure.

[0073] The present disclosure does not limit the specific method for achieving the change in cavity volume. The volume of the second cavity 322a can be achieved by changing pressure, such as hydraulic pressure or gas pressure.

[0074] In the injection mold provided by at least one embodiment of the present disclosure, the first sealing ring 321 and the second sealing ring 322 are respectively silicone sealing rings 320, and the bottom surface 323 is a silicone surface. In this way, the sealing ring 320 not only has a good airtight seal, but also has good stability such as high temperature resistance and corrosion resistance, and is also easy to process and saves production costs.

[0075] After defining the solution of providing the second cavity 322 a in the portion of the second sealing ring 322 corresponding to the special-shaped portion 410 , the present embodiment further introduces the structure of the second cavity 322 a .

[0076] For example, in an injection mold provided by one embodiment of the present disclosure, Figure 6 and Figure 7 As shown, the second cavity 322a is a closed cavity, and the cross-sectional shape of the second cavity 322a in the direction perpendicular to the thickness of the substrate 310 is either a triangle or a rectangle. While being able to effectively fit the irregular area of ​​the display module 500 to be injected, that is, the FPC step-shaped structure, it is also easy to process and improve production efficiency.

[0077] For another example, in an injection mold provided in another embodiment of the present disclosure, Figure 8 As shown, the second cavity 322a is a closed cavity, and the cross-sectional figure of the second cavity 322a in the direction perpendicular to the thickness of the substrate 310 is an irregular figure 330. The second cavity 322a on the second sealing ring 322 is set to the structure of the irregular figure 330, so that the structure of the second cavity 322a can be more closely matched with the irregular area of ​​the injection molded part, such as the step-shaped structure formed at the FPC in the injection molded display module 500, which is more conducive to achieving the sealing between the irregular part 410 on the injection runner 400 and the FPC step-shaped structure, thereby improving the stability and reliability of the injection molding process.

[0078] In the injection mold provided in at least one embodiment of the present disclosure, optionally, the irregular figure 330 includes a first part 331, a second part 332 and a transition part 333, the first part 331 extends along the thickness direction of the substrate 310, the second part 332 extends along the length direction of the substrate 110, and the transition part is used to connect the first part 331 and the second part 332.

[0079] In the injection mold provided by at least one embodiment of the present disclosure, the cross-sectional shape of the transition portion 333 in a direction perpendicular to the thickness of the substrate 310 is an arc tube shape.

[0080] For example, Figure 8As shown, the second sealing ring 322 is provided with a second cavity 322a at a portion corresponding to the shaped portion 410 of the injection molding runner 400. The cross-sectional figure of the second cavity 322a in the direction perpendicular to the thickness of the substrate 310 is an irregular figure 330. The irregular figure 330 includes a first portion 331, a second portion 332, and a transition portion 333 for connecting the first portion 331 and the second portion 332. The first portion 331 extends in the thickness direction of the substrate 310, such as the Z direction, and the second portion 332 extends in the length direction of the substrate 310, i.e., the X direction. The cross-sectional figure of the transition portion 333 in the direction perpendicular to the thickness of the substrate 310 is an arc tube shape, so that the first portion 331 and the second portion 332 can be smoothly connected, thereby improving the structural stability of the second cavity 322a. Specifically, the cross-sectional figures of the first portion 331 and the second portion 332 in the direction perpendicular to the thickness of the substrate 310 are respectively rectangular. Thus, during injection molding, the first portion 331 fits the side of the step-like structure formed by the FPC of the display module 500 to be injection molded, and the side of the step-like structure is perpendicular to the thickness direction of the display module, that is, parallel to the first portion 331 of the second cavity 322a in the Z direction. For example, the surface of the first portion 331 used to fit the side of the step-like structure is an inclined surface. At the same time, during injection molding, the second portion 332 fits the top surface of the step-like structure, and the top surface of the step-like structure is parallel to the length direction of the display module, that is, parallel to the second portion 332 of the second cavity 322a in the X direction. Thus, the second cavity 322a of the irregular pattern 330 is more conducive to realizing the formation of a sealing structure between the portion of the second sealing ring 322 corresponding to the special-shaped portion 410 and the FPC step-like structure, further improving the stability of the injection molding process.

[0081] like Fig. 9 As shown, during injection molding, the injection mold loaded with the parts to be injected, such as the display module 500 to be injected, will be placed in the injection molding machine, and the injection molding machine works so that the injection mold loaded with the parts to be injected, such as the display module 500 to be injected, is in a vacuum environment. When the external environment becomes a vacuum, the external pressure decreases sharply, and there is a certain pressure inside the second cavity 322a in the second sealing ring 322 (silicone sealing ring 320) (before the environment becomes a vacuum, the pressure in the second cavity 322a is balanced with the external atmospheric pressure). At this time, there is a large pressure difference between the inside and outside of the second cavity 322a on the silicone sealing ring 320, that is, the second sealing ring 322. Under the action of this pressure difference, the second sealing ring 322 will be subjected to an outward force. Due to the elasticity of silicone, the second cavity 322a will expand under the action of this force, thereby causing the volume of the enclosed cavity inside the second sealing ring 322, i.e., the second cavity 322a, to increase, thereby achieving the effect of squeezing the irregular area of ​​the display module 500 to be injected and forming a sealing structure with the irregular area, thereby improving the stability of the injection molding process and the injection molding effect.

[0082] Different from the above embodiments, the structure of the second cavity 322a on the second sealing ring 322 may also be configured in other solutions.

[0083] For example, in an injection mold provided in another embodiment of the present disclosure, Fig.10 As shown, the second cavity 322a is an open cavity, and the second cavity 322a includes a main cavity 322b and an open channel 322c connected to the main cavity 322b, and the open channel 322c realizes the communication between the main cavity 322b and the outside. Other structures can refer to the above embodiment description, which will not be repeated here.

[0084] In the injection mold provided by at least one embodiment of the present disclosure, the angle between the opening channel 322c and the main cavity 322b is a right angle.

[0085] In the injection mold provided by at least one embodiment of the present disclosure, the cross-sectional shape of the main cavity 322b in the direction perpendicular to the thickness of the substrate 310 is a rectangle with an opening.

[0086] For example, Fig.10 As shown, the second cavity 322a provided on the second sealing ring 322 is an open cavity, and the second cavity 322a includes a main cavity 322b and an open channel 322c connecting the main cavity 322b and the outside, and the open channel 322c is vertically provided relative to the main cavity 322b, and is in a straight line with the center of the main cavity 322b. Specifically, the cross-sectional shape of the main cavity 322b in the direction perpendicular to the thickness of the substrate 310 is a rectangle with an opening, and the cross-sectional shape of the open channel 322c in the direction perpendicular to the thickness of the substrate 310 is a rectangle with openings at both ends, that is, the two side walls of the open channel 322c are parallel to each other.

[0087] During injection molding, when the working environment of the injection mold loaded with the part to be molded, such as the display module 500 to be molded, is not a vacuum, the injection mold having the second cavity 322a with the open cavity as described above can be used to fill the second cavity 322a with liquid or gas through the open channel 322c, so that the volume of the second cavity 322a expands and deforms, and the special-shaped area of ​​the display module 500 to be molded, such as the step-shaped structure of the FPC, is sealed and injected. Specifically, the liquid in the liquid filling process can be water or other liquids. The gas in the gas filling process can be any one of relatively stable gases such as nitrogen and helium.

[0088] It should be noted that the injection mold disclosed in the present invention is not limited to the above structure. For example, in the case where the second cavity 322a is a closed cavity, the cross-sectional figure of the second cavity 322a in the direction perpendicular to the thickness of the substrate 310 is not limited to a triangle and a rectangle, but can also be a rhombus, an ellipse or other irregular shapes, and the figure of the irregular figure 330 can also be designed according to actual needs, and the cross-sectional figure of the first part 331 and the second part 332 in the direction perpendicular to the thickness of the substrate 310 can also be other structures; for example, in the case where the second cavity 322a is an open cavity, the cross-sectional figure of the main cavity 322b in the direction perpendicular to the thickness of the substrate 310 is not limited to a rectangle with an opening, but can also be other shapes such as a triangle with an opening, a trapezoid with an opening, etc., and the angle between the main cavity 322b and the opening channel 322c is not limited to a right angle, but can also be an obtuse angle or an acute angle; at the same time, the design of the opening channel 322c corresponding to the substrate 310 located on the side of the second sealing ring 322 away from the first cavity 200a can be selected according to actual needs. In addition, the specific shape, size, wall thickness and other parameters of the second cavity 322a can be designed according to actual needs, such as the structure and size of the special-shaped area of ​​the injection molded part. This design allows the second cavity 322a to effectively fit the special-shaped area of ​​the injection molded part, such as the step-shaped structure formed by the FPC of the injection molded display module 500, to form a reliable seal during injection. All of the above can be designed according to actual needs and will not be described in detail here.

[0089] Based on the above embodiments, the embodiments of the present disclosure also design other structures of the injection mold.

[0090] For example, in an injection mold provided in an embodiment of the present disclosure, at least one glue injection port 311 and at least one glue discharge port 312 are provided on the substrate 310 , and the glue injection port 311 and the glue discharge port 312 are respectively connected to the injection channel 400 .

[0091] In the injection mold provided in at least one embodiment of the present disclosure, a plurality of glue injection ports 311 and glue discharge ports 312 are provided, and the plurality of the plurality of the plurality of the glue injection ports 311 and the glue discharge ports 312 are alternately distributed.

[0092] In the injection mold provided by at least one embodiment of the present disclosure, the orthographic projections of the glue injection port 311 and the glue discharge port 312 on the substrate 310 fall on the injection runner 400 respectively.

[0093] For example, Fig.11As shown, a glue injection port 311 for guiding plastic melt, such as injection glue, to be injected into the injection channel and a glue discharge port 312 for discharging excess melt and air in the injection channel 400 are provided on the area corresponding to the bottom surface 323 of the glass substrate 310a and the sealing ring 320. Specifically, along the clockwise direction, the track length of the injection channel between the glue injection port 311 and the glue discharge port 312 is a first length; along the counterclockwise direction, the track length of the injection channel between the glue injection port 311 and the glue discharge port 312 is a second length; the first length and the second length respectively include the length of a special-shaped portion 410, and the first length and the second length are equal. In this way, after the injection glue is injected into the glue injection port 311, the injection glue flows toward the glue discharge port 312 along the clockwise and counterclockwise directions respectively, and reaches the glue discharge port 312 at the same time, which is conducive to achieving pressure balance in the injection channel, effectively discharging air in the injection channel, and improving the uniformity of the injection glue distribution, thereby improving the injection effect.

[0094] In the injection mold provided by one embodiment of the present disclosure, at least one special-shaped portion 410 of the injection channel 400 is provided, and the injection channel 400 also includes a connecting portion 420. The special-shaped portion 410 and the connecting portion 420 are connected so that the orthographic projection of the injection channel 400 on the substrate 310 is a quasi-rectangular shape with arc angles.

[0095] In the injection mold provided by at least one embodiment of the present disclosure, a group of spaced-apart glue injection ports 311 and glue discharge ports 312 are respectively provided in the areas corresponding to the long sides of the rectangular injection runner 400 on the substrate 310. In the injection mold provided by at least one embodiment of the present disclosure, in each group of glue injection ports 311 and glue discharge ports 312, the spacing between the glue injection ports 311 and the glue discharge ports 312 is equal.

[0096] For example, Fig.12 As shown, in the injection mold, the shape of the positive projection of the injection channel 400 on the glass substrate 310a is a rectangular frame with four arc corners. The rectangular frame includes two long sides and two short sides. A group of spaced injection ports 311 and discharge ports 312 are respectively arranged on the glass substrate 310a in the area corresponding to the long side of the rectangular injection channel 400, and the spacing between each group of injection ports 311 and discharge ports 312 is equal. Specifically, the glass substrate 310a is provided with injection ports 311, discharge ports 312, injection ports 311 and discharge ports 312, that is, the two sides of each injection port 311 are respectively spaced discharge ports 312, and the two sides of each discharge port 312 are respectively spaced injection ports 311. This design makes it equal or approximately equal when the injection glue injected from each injection port 311 reaches the adjacent discharge port 312 during injection molding, so as to improve the injection molding effect.

[0097] It should be noted that the embodiment of the present disclosure does not limit the specific position of the special-shaped portion 410, and it can be set in the area corresponding to the long side of the injection molding runner 400 and the rectangular frame, and can also be set in the area corresponding to the short side of the injection molding runner 400 and the rectangular frame, and can also be set in the area corresponding to the arc angle of the injection molding runner 400 and the rectangular frame. This can be specifically limited according to the position of the special-shaped area of ​​the display module 500 to be injected. At the same time, the shape and size of the injection molding runner 400 can also be specifically designed according to the situation of the part to be injected, not limited to the above examples. In addition, the embodiment of the present disclosure does not specifically design the structure, size, number and specific position of the injection port 311 and the discharge port 312. The above can be designed according to the size and shape of the part to be injected, such as the display module 500 to be injected. All of the above can be designed according to actual needs, and will not be repeated here.

[0098] The disclosed embodiment also provides an injection molding method for a display module, the injection molding method comprising: obtaining a display module to be injection molded, the periphery of the display module including at least part of a special-shaped area; obtaining an injection mold, the injection mold including an upper mold, a lower mold and an inner mold, the lower mold being configured to be assembled with the upper mold into an integral structure, a first cavity being provided in the integral structure, the inner mold being located in the first cavity and on the side of the upper mold facing the first cavity, an injection molding runner being provided on the side of the inner mold facing the first cavity, the injection molding runner including a special-shaped portion, the special-shaped portion being configured to reciprocate in the direction of the first cavity; placing the injection molded display module in the first cavity of the injection mold; moving the inner mold so that the injection molding runner of the inner mold cooperates with the area to be injection molded of the display module to form an injection molding channel, and controlling the special-shaped portion to extrude the special-shaped area of ​​the display module to form a sealing structure; and injecting glue into the injection molding channel.

[0099] For example, Fig.13 As shown, an injection molding method of a display module provided by an embodiment of the present disclosure includes the following steps.

[0100] Step S100: obtaining a display module to be injection molded, wherein the area to be injection molded of the display module to be injection molded includes a special-shaped area.

[0101] Step S200: Obtain an injection mold, the injection mold includes an upper mold, a lower mold and an inner mold, the lower mold is configured to be assembled with the upper mold into an integral structure, a first cavity is provided in the integral structure, the inner mold is located in the first cavity, and is located on the side of the upper mold facing the first cavity, an injection channel is provided on the side of the inner mold facing the first cavity, the injection channel includes a special-shaped portion, and the special-shaped portion is configured to reciprocate in the direction toward the first cavity.

[0102] Step S300: placing the display module to be injection molded in the first cavity of the injection mold.

[0103] Step S400: moving the inner mold so that the injection flow channel of the inner mold cooperates with the area to be injected of the display module to form an injection channel.

[0104] Step S500: controlling the special-shaped portion to squeeze the special-shaped area of ​​the display module to form a sealing structure.

[0105] Specifically, this can be achieved by designing and controlling the shaped portion that forms the injection flow channel corresponding to the shaped area. For example, the second cavity is formed by the portion of the second sealing ring, i.e., the silicone sealing ring, that is, the portion corresponding to the shaped portion near the display module to be injected, and the expansion of the second cavity is controlled to achieve the shaped portion squeezing the shaped area of ​​the display module to form a reliable seal. The structure of the second cavity and the method of achieving reciprocating motion of the area corresponding to the shaped portion of the second sealing ring toward the first cavity through expansion and contraction can be referred to the description in the above embodiments, and will not be repeated here.

[0106] Step S600: injecting plastic into the injection channel.

[0107] Specifically, the display module to be injected is placed in the injection machine and starts working, the injection glue is injected into the injection channel through the injection port in the display module to be injected, and the air and excess injection glue in the injection channel are discharged through the discharge port.

[0108] The present disclosure does not design the specific steps and parameters of the injection process, which can be designed according to the specific conditions of the display module to be injection-molded, and will not be elaborated here.

[0109] In an injection molding method for a display module provided by an embodiment of the present disclosure, in step S600, when forming an injection molding channel, the special-shaped portion of the inner mold corresponds to the special-shaped area of ​​the display module, and there is a first gap between the special-shaped portion and the special-shaped area in a direction perpendicular to the display module, and a second gap in a direction parallel to the display module, so that the special-shaped portion squeezes the special-shaped area of ​​the display module to form a sealing structure.

[0110] In the display module provided by at least one embodiment of the present disclosure, the first gap is 0.5 mm-0.8 mm, and the second gap is 0.2 mm-0.4 mm.

[0111] In a display module provided in an embodiment of the present invention, the display module to be injected includes a display substrate and a bonding structure located on the display substrate, and the bonding structure forms a step-like structure with a side of the display substrate close to the periphery. In a display module provided in an embodiment of the present invention, the bonding structure is a chip or a printed circuit board.

[0112] Exemplarily, the display module to be injection molded includes a display substrate and a printed circuit board located on the display substrate, and the step-shaped structure formed between the printed circuit board and the display substrate corresponds to the special-shaped area of ​​the area to be injection molded. During injection molding, when an injection molding channel is formed between the sealing ring on the inner mold and the display module to be injection molded, the movable part of the special-shaped part of the inner mold, that is, the part of the second sealing ring corresponding to the special-shaped part, has a first gap in the direction perpendicular to the display substrate, and the first gap is 0.5mm, 0.6mm, 0.7mm, 0.8mm; the movable part of the special-shaped part of the inner mold, that is, the part of the second sealing ring corresponding to the special-shaped part, has a second gap in the direction parallel to the display substrate, and the second gap is 0.2mm, 0.3mm, 0.4mm.

[0113] The embodiment of the present disclosure further provides a display device, which includes a display module. The display module is injection molded by the injection molding method of the display module in the above embodiment.

[0114] In an embodiment of the present disclosure, the display device may be an organic light emitting diode display device, a liquid crystal display device, an electronic paper display device, or the like.

[0115] For example, the display device in the embodiments of the present disclosure may be any product or component with a display function, such as a television, a digital camera, a mobile phone, a watch, a tablet computer, a laptop computer, a navigator, or the like.

[0116] It should be noted that the embodiments of the present disclosure do not describe all structures of the above-mentioned display device. To realize the necessary functions of the display device, those skilled in the art may set other structures according to specific application scenarios.

[0117] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. An injection mold, characterized in that: include: Upper mold; A lower mold is configured to be assembled with the upper mold into an integral structure, wherein a first cavity is provided in the integral structure; as well as The inner mold is located in the first cavity and on the side of the upper mold facing the first cavity. An injection channel is provided on the side of the inner mold facing the first cavity. The injection channel includes a special-shaped portion, and the special-shaped portion is configured to reciprocate in the direction of the first cavity.

2. The injection mold according to claim 1, characterized in that: The inner mold comprises: a substrate, disposed on a side of the upper mold facing the first cavity; and The sealing ring comprises a first sealing ring, a second sealing ring and a bottom surface, wherein the first sealing ring is disposed around the substrate, the second sealing ring is disposed around the substrate and is away from the periphery of the substrate, and the bottom surface is located on the substrate, disposed around the substrate and connected to the first sealing ring and the second sealing ring to form the injection flow channel; Wherein, the portion of the second sealing ring corresponding to the special-shaped portion is configured to reciprocate in the direction of the first cavity.

3. The injection mold according to claim 2, characterized in that: A second cavity is provided at a portion of the second sealing ring corresponding to the special-shaped portion, and a volume of the second cavity is configured to be variable; Preferably, the first sealing ring and the second sealing ring are respectively silicone sealing rings, and the bottom surface is a silicone layer.

4. The injection mold according to claim 3, characterized in that: The second cavity is a closed cavity, and the cross-sectional shape of the second cavity in a direction perpendicular to the thickness of the substrate is either a triangle or a rectangle. Alternatively, the cross-sectional shape of the second cavity in a direction perpendicular to the thickness of the substrate is an irregular shape. Preferably, the irregular shape includes a first part, a second part and a transition part, the first part extends along the thickness direction of the substrate, the second part extends along the length direction of the substrate, and the transition part is used to connect the first part and the second part; further preferably, the cross-sectional shape of the transition part in a direction perpendicular to the thickness of the substrate is an arc tube shape.

5. The injection mold according to claim 2, characterized in that: The second cavity is an open cavity, comprising a main cavity and an open channel connected to the main cavity, wherein the open channel enables the main cavity to communicate with the outside; Preferably, the angle between the opening channel and the main cavity is a right angle; Preferably, a cross-sectional shape of the main cavity in a direction perpendicular to the thickness of the substrate is a rectangle with an opening.

6. The injection mold according to claim 2, characterized in that: The substrate is provided with at least one glue injection port and at least one glue discharge port, and the glue injection port and the glue discharge port are respectively connected to the injection flow channel; Preferably, the glue injection port and the glue discharge port are provided in plurality, and the plurality of the two are respectively distributed alternately; Preferably, the orthographic projections of the glue injection port and the glue discharge port on the substrate fall on the injection flow channel respectively.

7. The injection mold according to claim 6, characterized in that: At least one of the special-shaped portions of the injection channel is provided, and the injection channel further comprises a connecting portion, wherein the connecting portion and the special-shaped portion are connected so that the orthographic projection of the injection channel on the substrate is a quasi-rectangular shape with arc angles; Preferably, a group of the glue injection ports and the glue discharge ports are arranged at intervals in the areas on the substrate corresponding to the long sides of the rectangular injection channel; Preferably, in each group of the glue injection ports and the glue discharge ports, the distances between the glue injection ports and the glue discharge ports are equal.

8. A method for injection molding a display module, characterized in that: include: Acquire a display module to be injection molded, wherein the area to be injection molded of the display module to be injection molded includes a special-shaped area; Obtain an injection mold, the injection mold comprising an upper mold, a lower mold and an inner mold, the lower mold being configured to be assembled with the upper mold into an integral structure, a first cavity being provided in the integral structure, the inner mold being located in the first cavity and on a side of the upper mold facing the first cavity, an injection channel being provided on a side of the inner mold facing the first cavity, the injection channel comprising a special-shaped portion, the special-shaped portion being configured to reciprocate in a direction toward the first cavity; Placing the display module to be injected into the first cavity of the injection mold; Moving the inner mold so that the injection flow channel of the inner mold cooperates with the area to be injected of the display module to form an injection channel; Controlling the special-shaped portion to move and squeeze the special-shaped area of ​​the display module to form a sealing structure; The injection molding glue is injected into the injection molding channel.

9. The injection molding method according to claim 8, characterized in that: When forming the injection channel, the special-shaped portion of the inner mold corresponds to the special-shaped area of ​​the display module, and there is a first gap between the special-shaped portion and the special-shaped area in a direction perpendicular to the display module and a second gap in a direction parallel to the display module; Preferably, the first gap is 0.5 mm-0.8 mm, and the second gap is 0.2 mm-0.4 mm.

10. The injection molding method according to claim 8, characterized in that: The display module to be injected includes a display substrate and a bonding structure located on the display substrate, and the bonding structure forms a step-shaped structure with a side of the display substrate close to the periphery; Preferably, the bonding structure is a chip or a printed circuit board.

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