A glue frame manufacturing mold for a liquid crystal display module glue frame and an integrated glue frame

Abstract

The application discloses a glue frame manufacturing mold for a liquid crystal display module glue frame and an integrated glue frame, relates to the technical field of liquid crystal display backlight module manufacturing, and comprises a front mold plate, a front mold kernel, a rear mold plate, a rear mold kernel and a demolding assembly; the front mold kernel is fixed to the front mold plate; the rear mold kernel is fixed to the rear mold plate; the front mold kernel and the rear mold kernel are respectively provided with a convex mold module and a concave mold groove matched in shape; a side wall of the concave mold groove is provided with a flow channel in communication, and the flow channel is used for connecting an external glue injection; the plate surfaces of the front mold plate and the rear mold plate can be pressed together in the front-rear direction, and a glue filling cavity can be formed between the convex mold module and the concave mold groove by synchronous pressing, and is used for filling glue; the application cancels the metal iron frame component, improves the signal transmission sensitivity of a liquid crystal display terminal, strengthens the structural reliability and light leakage prevention effect of the glue frame, improves the use stability of an ultrathin backlight product, saves the cost of the glue frame, improves the injection molding process efficiency, and improves the product yield.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal display backlight module manufacturing technology, and in particular to a mold for making a frame for a liquid crystal display module and an integrated frame. Background Technology

[0002] The backlight frame is a crucial structural and optical component of the backlight, determining not only its shape but also the reliability of the LCD module. Conventional backlights are designed with a thickness of 2.0mm, with 90° corners around the perimeter. The perimeter thickness must be at least 0.7mm to effectively suppress structural anomalies such as negative pressure adhesion, blowouts, insufficient adhesive, shrinkage, and demolding deformation between the frame and the mold. Current ultra-thin integrated frames, aiming for a thickness below 1.8mm while ensuring support strength and providing accurate positioning for the precise stacking of optical components like light guide plates and films, typically employ an iron frame embedded in the mold and integrally molded with the frame using injection molding. This creates a U-shaped structure, with a recessed center forming the light guide plate groove. Adhesive is then used to fill the surrounding area, creating a composite glue-iron frame structure.

[0003] In this type of glue-iron composite frame, the localized high temperature and rapid cooling during the injection molding process cause the iron frame to easily deform due to thermal expansion and contraction. The resulting glue frame structure warps, twists, or locally deforms, leading to uneven stress on the light guide plate and optical film, resulting in light leakage, shadows, film arching, or interference fringes, affecting the quality of the backlight module product. Furthermore, the material cost is for both the glue frame and the iron frame as a whole, and the process adjustment of deformed products requires correction by a complete machine, making the manufacturing process complex and the cost and production high. The glue-bonded composite frame is also prone to causing radio frequency reflection, affecting the antenna sensitivity of the terminal product. Summary of the Invention

[0004] The purpose of this invention is to address the problems in existing plastic-iron composite frames and current frame preparation processes, where the iron frame is prone to deformation due to thermal expansion and contraction during injection molding, and the overall structure of the molded frame is prone to warping, twisting, or localized deformation. This invention provides a mold for manufacturing plastic frames for liquid crystal display modules and an integrated plastic frame.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A mold for manufacturing a frame for a liquid crystal display module includes: a front template, a front mold core, a rear template, a rear mold core, and a demolding assembly; the front mold core is fixed to the front template; the rear mold core is fixed to the rear template; the front mold core and the rear mold core are respectively provided with matching convex and concave mold grooves; the sidewall of the concave mold groove is provided with a connected flow channel for connecting external glue injection; the surfaces of the front template and the rear template can be pressed together in the front-rear direction, thereby synchronously pressing the convex and concave mold grooves to form a glue-filling cavity between the convex and concave mold grooves; the glue-filling cavity is used to fill glue.

[0007] The demolding assembly includes: a spring block and a first elastic element; the front mold core or the rear mold core is provided with a guide groove parallel to the front-back direction; the spring block is slidably connected to the guide groove in the front-back direction, and one end of the spring block can abut against the front mold core or the rear mold core without the guide groove; the other end of the spring block is fixedly connected to the first elastic element, and can extend and retract to abut against the front template or the rear template on the side with the guide groove.

[0008] The mold for manufacturing the frame of a liquid crystal display module described in this invention uses the convex and concave mold plates of the front and rear mold cores to simultaneously press together with the front and rear mold plates to form a filling cavity. The convex and concave mold plates of the front and rear mold cores are relatively fixed rigid components, providing support strength and pressure holding during frame molding. By controlling the pressing pressure of the front and rear mold plates, the thickness of the frame can be accurately controlled and the molding process maintained. This eliminates the need for traditional iron frame composite molding, enabling the formation of an ultra-thin, all-plastic, one-piece frame. This meets the requirements for manufacturing a 1.19mm ultra-thin backlight frame, significantly reducing raw material costs, minimizing the possibility of injection molding deformation, enhancing light leakage prevention, improving frame production quality, and enhancing the overall performance of the ultra-thin backlight product. Stability is achieved by eliminating the reflection interference of metal composite frames on the radio frequency signals of terminal products, significantly improving the antenna receiving sensitivity and performance of LCD terminals, and making it suitable for display devices that reduce radio frequency reflection interference, thus enhancing the versatility of frame products. With the setting of the demolding component, after the front mold core and the rear mold core are pressed together, the first elastic element is compressed by the push of the spring block. After the rubber material is formed into a frame, the elastic recovery of the first elastic element separates the front mold core and the rear mold core, achieving demolding. It also achieves a buffering effect on the pressing force / demolding separation of the front mold core and the rear mold core, reducing abnormalities such as mold pulling, mold jamming, frame deformation, and insufficient glue during demolding, further improving the quality of frame products. Moreover, it eliminates the need for the traditional iron frame anti-arch design and shaping process, greatly simplifying the process flow and improving production efficiency.

[0009] Preferably, in the mold for manufacturing the plastic frame of a liquid crystal display module according to the present invention, the front mold core is provided with an ejector assembly on the side near the front template, or the rear mold core is provided with an ejector assembly on the side near the rear template; the ejector assembly includes: a top plate, a pressure plate, and a plurality of ejector pins distributed perpendicular to the front-rear direction; the top plate and the pressure plate are arranged sequentially adjacent to the front mold core or the rear mold core; the ejector pins are perpendicular to the front-rear direction, and one end is fixed to the top plate; the pressure plate is provided with a plurality of first pin holes matching the ejector pins; the convex module or the concave mold groove is provided with a plurality of second pin holes matching the ejector pins; the other end of the ejector pin passes through the first pin holes and the second pin holes in sequence, thereby being able to push the molded plastic frame between the front mold core and the rear mold core.

[0010] As a preferred embodiment of the present invention, by setting the top adhesive component, during the demolding process, the molding frame between the front mold core and the rear two mold cores can be pushed in the opposite direction away from the front template or the rear template, thereby reducing the possibility of the molding frame being pulled and deformed as it separates and moves with the mold cores during demolding, and further improving the quality of the molding frame product.

[0011] Preferably, in the mold for manufacturing the frame of a liquid crystal display module according to the present invention, the front template and the rear template are respectively provided with a first fixing plate and a second fixing plate on the outer side in the front-rear direction; the first fixing plate or the second fixing plate on the side where the top adhesive component is provided is provided with a top hole; the first fixing plate and the second fixing plate are respectively provided with two mold corners; the pressure plate is located on the inner side of the two mold corners.

[0012] As a preferred embodiment of the present invention, by setting the mold corner and the top hole, during the demolding process, the pressure plate can be pushed by the push rod passing through the top hole, so that the force on the pressure plate is located in the center. Combined with the supporting effect of the mold corner, the uniformity and stability of the pressure control of the pressure plate are further improved.

[0013] Preferably, in the mold for manufacturing the frame of a liquid crystal display module according to the present invention, the pressure plate is provided with a return needle and a second elastic member perpendicular to the front-to-back direction; the front template and the rear template are respectively provided with a matching first return hole and a second return hole; one end of the return needle is fixed to the pressure plate, and the other end of the return needle can pass through the first return hole and the second return hole and abut against a first fixing plate or a second fixing plate without a top adhesive assembly; the second elastic member is sleeved on the outer side of the return needle, and the diameter of the second elastic member is larger than the diameter of the first return needle hole and the second return needle hole.

[0014] As a preferred embodiment of the present invention, by setting the first return pin hole, the second return pin hole, and the return pin, during the demolding process, the ejector plate and the ejector pin abut against the molding frame, and the pressure plate compresses the second elastic element; after demolding is completed, the force of the ejector plate is released, and the pressure plate returns to its original position through the elastic recovery of the second elastic element, which improves the smoothness of the interaction between the pressure plate and the top plate, reduces the tilting of the plate surface caused by the direct operation of the pressure plate by the robotic arm, and further improves the pressure balance of the mold core pressing and improves the quality of the molding frame product.

[0015] Preferably, in the mold for manufacturing the frame of a liquid crystal display module according to the present invention, the side of the convex module is provided with a first piece; the thickness of the first piece is smaller than the thickness of the convex module; and the concave mold groove is provided with a second piece that matches the first piece.

[0016] As a preferred embodiment of the present invention, by setting the first and second blocks, the shape, thickness and width of the first and second blocks can be matched to achieve the ability to adapt to different requirements or specifications of the preparation of the plastic frame edge, thereby further improving the flexibility and universality of the mold.

[0017] Preferably, in the mold for manufacturing the frame of a liquid crystal display module according to the present invention, an insert is provided in the concave mold groove; the insert is spaced apart from the side of the concave mold groove, and the insert protrudes 30-50 micrometers relative to the bottom of the concave mold groove in a direction perpendicular to the front and back.

[0018] As a preferred embodiment of the present invention, by setting the insert, the uniform height difference of 30μm~50μm and the side gap formed by the insert cavity groove form a pressure-bearing surface that is slightly higher in the middle and slightly lower at the edge, which can smoothly discharge the high-pressure gas inside from the cavity of the mold core to the side, effectively solving the process defects such as overflow, flash, and uneven filling during injection molding, and greatly improving the product yield.

[0019] Preferably, the mold for manufacturing the frame of a liquid crystal display module according to the present invention includes a demolding assembly comprising multiple sets respectively disposed around the convex module and the concave mold groove.

[0020] As a preferred embodiment of the present invention, by setting multiple sets of demolding components around the convex module or around the concave mold groove, multiple sets of demolding components can be compressed simultaneously when pressing the front mold core and the rear mold core, providing a balanced buffer effect perpendicular to the front and rear directions for the pressing force, so that the pressing force is more evenly distributed in the vertical direction of the front and rear directions, realizing the horizontal and uniform ejection of the plastic frame during demolding, reducing abnormalities such as mold pulling, mold jamming, plastic frame deformation, and insufficient plastic during demolding, significantly reducing the wear rate of the mold, extending the service life of the mold, reducing the frequency and cost of mold maintenance, and adapting to the stable production needs of large-scale mass production.

[0021] Preferably, in the mold for manufacturing the frame of a liquid crystal display module according to the present invention, the spring block is a four-sided prism; the guide groove is a four-sided groove matching the four-sided prism.

[0022] As a preferred embodiment of the present invention, by setting the four-sided column groove and the four-sided column, the torsion of the spring block in the direction perpendicular to the front and back can be reduced during the demolding process or the pressing process, and the possibility of the front mold core and the rear mold core being misaligned or slipped in the direction perpendicular to the front and back can be further reduced, thereby improving the accuracy of mold core alignment.

[0023] Preferably, in the mold for manufacturing the frame of a liquid crystal display module according to the present invention, the front template and the rear template are respectively provided with matching guide posts and guide holes; the guide posts are slidably connected to the guide posts in the front-to-back direction.

[0024] As a preferred embodiment of the present invention, the guide post and guide hole can enhance the positioning accuracy of the front mold core and the rear mold core during the pressing process, and can support the relative movement of the front mold core and the rear mold core with the template, reduce the probability of misalignment or displacement, and improve the stability of the pressing movement of the front and rear mold cores.

[0025] Preferably, the mold for making the frame of a liquid crystal display module according to the present invention has water channels on the front template or rear template that does not have the top adhesive component.

[0026] As a preferred embodiment of the present invention, by setting the water channel, cooling water can be introduced into the water channel to achieve water-isolated cooling of the injection-molded frame, thereby further improving the safety and reliability of the mold.

[0027] An integrated frame is injection molded using the frame manufacturing mold for liquid crystal display modules described in this invention; the thickness of the back panel of the frame is ≤0.41mm; the thickness of the perimeter of the frame is ≤0.47mm.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] 1. The convex and concave mold plates of the front and rear mold plates can be pressed together synchronously with the front and rear mold plates to form a filling cavity. The convex and concave mold plates of the front and rear mold plates are rigid parts with relatively fixed shapes, which play a role in supporting the strength of the plastic frame molding and holding the molding pressure. The thickness of the plastic frame can be controlled more accurately and the molding can be maintained. Traditional iron frame composite molding is not required. Thus, it is possible to form an all-plastic ultra-thin one-piece plastic frame, which meets the plastic frame thickness preparation of 1.19mm ultra-thin backlight. While greatly reducing the raw material cost, it reduces the possibility of plastic frame injection deformation, enhances the anti-light leakage effect, improves the production quality of plastic frame, and improves the overall use stability of ultra-thin backlight products.

[0030] 2. Eliminates the reflection interference of metal composite frames on the radio frequency signals of terminal products, significantly improves the antenna receiving sensitivity and performance of LCD display terminals, and can be applied to display devices that reduce radio frequency reflection interference, thus improving the universality of frame products;

[0031] 3. With the set of demolding components, after the front mold core and the rear mold core are pressed together, the first elastic element is compressed by the push of the spring block. After the rubber material is formed into a plastic frame, the elastic recovery of the first elastic element separates the front mold core and the rear mold core. On the basis of demolding, it also realizes the buffering effect of the pressing force / demolding separation of the front mold core and the rear mold core, reducing abnormalities such as mold pulling, mold jamming, plastic frame deformation and insufficient plastic during demolding, further improving the quality of plastic frame products. Moreover, there is no need to set the traditional iron frame anti-arch design and shaping process, which greatly simplifies the process flow and improves production efficiency.

[0032] 4. The injection-molded one-piece frame can accommodate components such as light guide plates, diffusion films, brightness enhancement films, frame adhesive, FPC, and LEDs. LEDs are soldered to the designated area of ​​the FPC using an STM process to form FPCA. The total thickness of the ultra-thin backlight design can be reduced to 1.19mm. The bottom is fully enclosed with adhesive filling, and the bottom adhesive filling thickness is 0.41mm, forming a light guide plate groove with a groove depth of 0.73mm. This groove is used to place components such as light guide plates, diffusion films, brightness enhancement films, and FPCA in sequence. The frame adhesive is then used to seal the light guide plate groove with the components inside. This design is suitable for ultra-thin backlight designs, and this design scheme forms an ultra-thin one-piece frame. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the front mold core of the present invention;

[0034] Figure 2 This is a three-dimensional structural diagram of the rear mold core of the present invention;

[0035] Figure 3 This is a schematic diagram of the pressing state of the front mold core and the rear mold core of the present invention;

[0036] Figure 4 This is a three-dimensional structural diagram of the front template of the present invention;

[0037] Figure 5 This is a three-dimensional structural diagram of the rear template of the present invention;

[0038] Figure 6 This is a three-dimensional structural schematic diagram of the top adhesive assembly of the present invention;

[0039] Figure 7 This is a three-dimensional structural diagram of the first fixing plate or the second fixing plate of the present invention;

[0040] Figure 8This is a schematic diagram showing the assembly state of the front template and top adhesive assembly of the present invention;

[0041] Figure 9 This is a schematic diagram of the front and rear templates in the separated state of the present invention;

[0042] Figure 10 This is a schematic diagram of the three-dimensional structure of the frame of the present invention;

[0043] Icons: 1. Front mold plate; 11. First return hole; 12. Guide hole; 2. Front mold core; 21. convex module; 211. First assembly block; 3. Rear mold plate; 31. Second return hole; 32. Guide pillar; 33. Water channel; 4. Rear mold core; 41. Cavity groove; 411. Second pin hole; 412. Second assembly block; 413. Insert; 42. Runner; 5. Demolding assembly; 51. Spring block; 52. First elastic element; 61. Top plate; 611. Top hole; 62. Pressure plate; 621. First pin hole; 622. Return pin; 623. Second elastic element; 63. Ejector pin; 64. Mold corner; 7. First fixing plate; 8. Second fixing plate; 100. Frame; 101. Edge; 102. Back panel. Detailed Implementation

[0044] The present invention will now be described in detail with reference to the accompanying drawings.

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0046] Example 1:

[0047] refer to Figures 1 to 9 As shown, this invention discloses a mold for manufacturing a frame 100 for a liquid crystal display module, comprising: a front template 1, a front mold core 2, a rear template 3, a rear mold core 4, and a demolding assembly 5; the front mold core 2 is fixed to the front template 1; the rear mold core 4 is fixed to the rear template 3; the front mold core 2 and the rear mold core 4 are respectively provided with a convex module 21 and a concave mold groove 41 with matching shapes; the side wall of the concave mold groove 41 is provided with a connected flow channel 42, which is used to connect to external glue injection; the plates of the front template 1 and the rear template 3 can be pressed together in the front-rear direction, thereby synchronously pressing the convex module 21 and the concave mold groove 41, forming a glue-filling cavity between the convex module 21 and the concave mold groove 41; the glue-filling cavity is used to fill glue;

[0048] The demolding assembly 5 includes: a spring block 51 and a first elastic element 52; the front mold core 2 or the rear mold core is provided with a guide groove parallel to the front-back direction; the spring block 51 is slidably connected to the guide groove in the front-back direction, and one end can abut against the front mold core 2 or the rear mold core 4 without the guide groove; the other end of the spring block 51 is fixedly connected to the first elastic element 52, and can extend and retract to abut against the front template 1 or the rear template 3 on the side with the guide groove.

[0049] In this invention, the front-back direction is understood as the direction perpendicular to the surface of the front template 1 and the surface of the rear template 3, including the direction from the front template 1 to the rear template 3 and the direction from the rear template 3 to the front template 1. The thickness in this invention is understood as the width of the component perpendicular to the front-back direction. The direction perpendicular to the front-back direction can be understood as vertical or horizontal, and can be adjusted to be horizontal or vertical depending on the actual needs of the component implementation.

[0050] The surfaces of the concave mold groove 41 and the convex module 21 described in this invention can be coated with a release agent, which enables the plastic frame 100 formed after the front mold core 2 and the rear mold core 4 are separated to be easily separated.

[0051] It should be noted that the convex module 21 and the concave mold groove 41 described in this invention can be respectively provided on the front mold core 2 and the rear mold core 4, and the convex module 21 and the concave mold groove 41 can match and be pressed together in the front-to-back direction; in this preferred embodiment, refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the convex module 21 is provided on the front mold core 2, and the concave mold groove 41 is provided on the rear mold core 4; correspondingly, the front mold core 2 is fixed to the front template 1, the rear mold core 4 is fixed to the rear template 3, the guide groove is provided on the front mold core 2, and the spring block 51 is slidably connected to the guide groove of the front mold core 2. One end of the spring block 51 with the first elastic element 52 can extend and abut against the front template 1; the other end of the spring block 51 without the first elastic element 52 can abut against the outer surface of the rear mold core 4, so that the front mold core 2 and the rear mold core 4 can be separated by the extension of the first elastic element 52, thereby realizing demolding.

[0052] In this invention, the first pinhole 621 and the second pinhole 411 that match the pin 63 are both understood to be of a size and diameter that are equivalent to or larger than the diameter of the pin 63, and the pin 63 can move back and forth in the first pinhole 621 and the second pinhole 411.

[0053] Specifically, this embodiment uses an assembled mold of mold frame and mold core. The mold frame and mold core have separate and combinable designs of front mold and rear mold. The protrusion height of the protrusion module 21 of the front mold core 2 can be set to 0.73mm. The recessed depth of the concave mold groove 41 of the rear mold core 4 is 1.15mm. The recessed area of ​​the concave mold groove 41 needs to be larger than the protrusion area of ​​the protrusion module 21, such as 0.47mm larger on the left and right sides and the top side, and 0.27mm larger on the bottom side. After the front mold and the rear mold are closed, the protrusion module 21 of the front mold and the concave mold groove 41 sink to form a model cavity. After filling the model cavity with glue, demolding can obtain an integrated ultra-thin glue frame 100.

[0054] In this preferred embodiment, the front mold core 2 is provided with an ejector assembly on the side near the front template 1, or the rear mold core 4 is provided with an ejector assembly on the side near the rear template 3; the ejector assembly includes: a top plate 61, a pressure plate 62, and a plurality of ejector pins 63 distributed perpendicular to the front-rear direction; the top plate 61 and the pressure plate 62 are arranged adjacent to the front mold core 2 or the rear mold core 4 in sequence; the ejector pins 63 are perpendicular to the front-rear direction, and one end is fixed to the top plate 61; the pressure plate 62 is provided with a plurality of first pin holes 621 that match the ejector pins 63; the convex module 21 or the concave mold groove 41 is provided with a plurality of second pin holes 411 that match the ejector pins 63; the other end of the ejector pins 63 passes through the first pin holes 621 and the second pin holes 411 in sequence, thereby being able to push the molding frame 100 between the front mold core 2 and the rear mold cores. Specifically, the top plate 61 and the pressure plate 62 are locked together by locking screws, so that the balance is fixed in the top plate 61, and the top plate 61 and the pressure plate 62 have formed a module as a whole.

[0055] In this preferred embodiment, the front template 1 and the rear template 3 are respectively provided with a first fixing plate 7 and a second fixing plate 8 on the outer side in the front-rear direction; the first fixing plate 7 or the second fixing plate 8 on the side where the top adhesive assembly is provided is provided with a top hole 611; the first fixing plate 7 and the second fixing plate 8 are respectively provided with two mold corners 64; the pressure plate 62 is located on the inner side of the two mold corners 64.

[0056] Specifically, in this embodiment, the rear template 3 and the mold corner 64 are provided. The rear template 3 is provided with M10 screw holes and M8 screw holes. A through-hole 611 is designed in the center of the rear template 3. The two mold corners 64 are respectively designed with M10 screw holes, which directly penetrate the mold corners 64. The M8 locking screws penetrate the screw holes of the rear template 3, locking the rear template 3 and the mold corners 64. The two mold corners 64 of the rear template 3 are locked together to form a U-shaped groove. The M10 locking screws directly penetrate the rear template 3 and the mold corners 64 to achieve locking with the rear template 3.

[0057] In a preferred embodiment, the pressure plate 62 is provided with a return needle 622 perpendicular to the front-back direction and a second elastic element 623; the front template 1 and the rear template 3 are respectively provided with a matching first return hole 11 and a second return hole 31; one end of the return needle 622 is fixed to the pressure plate 62, and the other end of the return needle 622 can pass through the first return hole 11 and the second return hole 31, and can abut against the first fixing plate 7 or the second fixing plate 8 without the top adhesive assembly; the second elastic element 623 is sleeved on the outer side of the return needle 622, and the diameter of the second elastic element 623 is larger than the diameter of the first return needle 622 hole and the second return needle 622 hole.

[0058] In a preferred embodiment, the convex module 21 has a first panel 211 on its side; the thickness of the first panel 211 is smaller than the thickness of the convex module 21; the concave mold groove 41 has a second panel 412 that matches the first panel 211. The matching of the second panel 412 and the first panel 211 in this invention is understood as a corresponding position, the sum of the thicknesses of the second panel 412 and the first panel 211 is equal to the height of the convex module 21; the width of the second panel 412 parallel to the front-back direction is greater than the width of the first screen block in the front-back direction. The principle is that the reduced volume of the first component 211 compared to the second component 412 is filled with edge adhesive material, which is then molded into the side of the frame 100 where the lamp hole is located. The lamp hole step is designed with a thickness of 0.27mm, which is 0.23mm lower than the thickness of the other sides of the frame 100. The lamp hole step has four LED light slots for placing and fixing the FPCA (Feed-Plastic Cushion). The LEDs of the FPCA are embedded in the LED light slots, enabling the fabrication of an ultra-thin, integrated frame 100 with a specific structure, further improving the versatility of the mold. It should be noted that the position of the lamp hole can be determined by setting the protrusion width of the convex module 21 in the front-to-back direction, thus ensuring that the frame 100 on the side where the lamp hole is located has a lamp hole position.

[0059] Specifically, the assembly block is located at the lamp opening, i.e., the lamp opening step is spliced ​​with the front mold core 2. The lamp opening of the ultra-thin integrated plastic frame 100 needs to be recessed by 0.23mm to accommodate the FPCA and is 0.5mm higher than the light guide plate groove. Therefore, the lamp opening of the ultra-thin integrated plastic frame 100 forms a height difference of 0.23mm between the top surface and the bottom of the light guide plate groove. By splicing the assembly block with the front mold core 2, the splicing interface between the assembly block and the front mold core 2 is located in the area inside the lamp opening. The 0.50um gap between the assembly block and the front mold core 2 is used to vent the front mold. The insert is designed as a T-shaped cylindrical column with a hollow center. It is inserted from the outside of the front mold and spliced ​​with the nozzle of the injection molding equipment. After the mold is closed, the hollow center of the insert is connected to the front and rear molds, effectively introducing the molten raw material into the rear mold runner 42.

[0060] Specifically, in this embodiment, the rear mold core 4 is provided with a flow channel 42, a sprue, and an insert 413. The flow channel 42 is connected to the insert. The size and direction of the flow channel 42 are designed according to the flow characteristics of the raw material molten plastic, the mold number array, the injection speed of the injection equipment, and the structural characteristics of the mold frame 100. The sprue connects the set position of the sinking mold to the flow channel 42, enabling the raw material molten plastic to be rapidly filled into the mold cavity under high pressure. The insert 413 adopts a multi-block combination design and is reasonably inserted into the sinking mold of the rear mold core according to the set area. The gap between the multi-block combination insert 413 and the mold core is about 30um~50um, which can be used to rapidly inject the raw material molten plastic into the mold cavity under high pressure to form high pressure. The gap between the insert 413 and the mold core allows the high-pressure gas in the mold cavity to be effectively discharged, making the injection of raw material molten plastic into the mold cavity more smooth and effectively filling the entire mold cavity.

[0061] For example, the front mold core 2 is designed with spring blocks 51, interlocking blocks, inserts, etc. The four corners of the protrusion of the front mold core 2 are provided with four movable spring blocks 51. The distance between each spring block 51 and the edge of the protrusion 21 is 0.24mm. The spring block 51 passes through the bottom mold of the mold core to the top mold, and the gap between the spring block 51 and the front mold core 2 is 50um. After the spring block 51 passes through the front mold, a spring is provided in front of the front mold frame, so that the spring block 51 is 1mm higher than the top mold of the front mold core 2. At the same time, the spring block 51 is also 0.27mm higher than the protrusion of the protrusion 21. The front and rear molds trigger the spring mechanical mechanism of the front mold frame to push the spring block 51 to move back and forth when the mold is closed. When the mold is closed, the front mold surface closes with the front mold. The surface of the rear mold outside the outer structure presses the spring block 51 down until it is flush with the top mold of the front mold core 2. Upon mold opening, the front and rear molds open. Triggered by the front mold frame and spring mechanism, the spring blocks 51 move forward, extending above the protruding surface of the front mold core 2's convex module 21. The four movable spring blocks 51 simultaneously and horizontally eject the plastic frame 100, allowing it to smoothly detach from the mold and achieve demolding. Preferably, in this embodiment, the spring blocks 51 are four-sided prisms; the guide groove is a four-sided groove matching the four-sided prism.

[0062] By using the synchronously moving spring blocks 51 set at the four corners of the front mold, the horizontal and uniform ejection of the plastic frame 100 is achieved, which completely avoids the abnormalities such as mold pulling, mold jamming, deformation of the plastic frame 100, and insufficient glue that are prone to occur during demolding in traditional structures. This significantly reduces the wear rate of the mold, extends the service life of the mold, reduces the frequency and cost of mold maintenance, and is suitable for the stable production needs of large-scale mass production.

[0063] This invention enables the injection-molded frame 100 to completely eliminate the metal frame component, thereby eliminating the reflection interference of metal structures on the radio frequency signals of the terminal product from the root, significantly improving the antenna receiving sensitivity of the LCD terminal, optimizing the wireless communication performance of the product, and at the same time, the fully enclosed 0.41mm±0.1mm bottom adhesive structure realizes the full adhesive support of the light guide plate, further strengthening the structural reliability and light leakage prevention effect of the frame 100, and improving the overall stability of the ultra-thin backlight product.

[0064] In this preferred embodiment, an insert 413 is provided within the cavity groove 41; the insert 413 is spaced apart from the side of the cavity groove 41, and the insert 413 protrudes 30-50 micrometers relative to the bottom of the cavity groove 41 in a direction perpendicular to the front and back. Specifically, the mold insert 413 and the processing technology: the mold core, spring block 51, insert 413 and runner 42 are processed using techniques such as wire cutting, grinding, drilling, and spark discharge to form a reasonable assembly structure.

[0065] In this preferred embodiment, the demolding assembly 5 includes multiple sets of front template 1 and rear template 3 respectively disposed around the convex module 21 and the concave mold groove 41, each equipped with matching guide pillars 32 and guide holes 12; the guide pillars 32 are slidably connected in the front-to-back direction. Specifically, the front template 1 and the first fixing plate 7 are assembled, the rear template 3 and the second fixing plate 8 are assembled, and the guide pillar holes of the front template 1 are fitted into the guide pillars 33 of the rear mold to form the mold assembly.

[0066] In this preferred embodiment, the front mold plate 1 or the rear mold plate 3, which does not have the top adhesive assembly, is provided with water channels 33. Specifically, the rear mold plate 3 is provided with two transverse rear mold water channels 33, which extend from the left side of the rear mold plate 3 to the right side to form a water circulation loop between the water channels 33 and the injection molding equipment, for cooling each mold number of the rear mold.

[0067] The specific operational steps of this invention are as follows:

[0068] Step 1: The front mold plate 1 is installed at the nozzle of the injection molding equipment, and is locked at the nozzle by a step formed by the front mold plate 1 and the first fixing plate 7. The rear mold plate 3 and the mold corner 64 form a step for locking the rear mold installed on the injection molding equipment. The water channels 33 of the front mold plate 1 and the rear mold plate 3 are respectively connected to the water channel 33 interface of the injection equipment for cooling the mold cavity.

[0069] Step 2: The injection molding equipment drives the servo system to close and press the front mold plate 1 and the rear mold plate 3 together. The screw is driven by the all-electric servo system to heat and melt the thermoplastic raw material granules in the barrel. The servo system drives the screw to generate high temperature and high pressure on the heating cylinder, and injects the raw material melt from the nozzle through the inlet and into the injection port. At the same time, the raw material melt is injected into the runner 42. The raw material melt is introduced into the mold cavity of the mold through the runner 42. Under the action of the high pressure of the injection molding equipment, the raw material melt quickly fills the mold cavity. After holding the pressure and cooling, the raw material melt in the mold cavity quickly solidifies and sets.

[0070] Step 3: The injection molding equipment drives the servo system to control the mold opening. During the mold opening process, the spring block 51 of the front mold core 2 is pushed up and reset by the subsequent mold opening. At the same time, the spring block 51 overlaps with the convex module 21 of the plastic frame 100 by 0.23mm, which pushes the plastic frame 100 in the convex module 21 of the front mold core 2 out of the convex module 21. The plastic frame 100 and the sprue are separated from the front mold convex module 21 without damage. At this time, the plastic frame 100 and the sprue are separated from the front mold without damage and the subsequent mold moves.

[0071] Step 4: The injection molding equipment drives the servo system to control the ejector pin to pass through the top hole 611 of the rear mold plate 3 and then push against the pressure plate 62. The injection molding equipment drives the ejector pin to push the pressure plate 62 and the top plate 61, so that the ejector pin 63 between the pressure plate 62 and the top plate 61 presses into the rear mold plate 3. The ejector pin 63 passes through the first pin hole 621 of the rear mold core 4 and pushes the plastic frame 100 to disengage from the cavity groove 41 of the rear mold core 4. At the same time, the sprue also disengages from the runner 42 of the rear mold core 4, so as to achieve the plastic frame 100 disengages from the rear mold core 4 without damage, thereby achieving the effect of non-destructive demolding and forming an ultra-thin one-piece plastic frame 100 finished product.

[0072] The advantages of the ultra-thin integrated frame 100 non-destructive demolding design method for liquid crystal display products proposed in this invention compared with the prior art are as follows:

[0073] Example 2:

[0074] refer to Figure 3 and Figure 10 As shown, based on Embodiment 1, this embodiment discloses an integrated plastic frame 100, which is injection molded using the plastic frame manufacturing mold described in Embodiment 1; the thickness of the back panel 102 of the plastic frame 100 is ≤0.41mm; the thickness of the perimeter 101 of the plastic frame 100 is ≤0.47mm. Specifically, the integrated plastic frame 100 injection molded by the present invention adopts a perimeter 101 on all four sides and a recessed, concave box-like shape in the middle, forming a fully enclosed, ultra-thin integrated plastic frame 100 at the bottom, as shown... Figure 10As shown, the central sunken area is the light guide plate groove. The bottom is filled with 100% colloid to form a closed bottom surface to support the light guide plate. The thickness of the closed bottom colloid is controlled at 0.41mm±0.1mm. The bottom colloid and the surrounding perimeter 101 are combined into one, which makes the structure of the colloid frame 100 more reliable and achieves an ultra-thin integrated colloid frame 100 to prevent light leakage.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mold for manufacturing a plastic frame for a liquid crystal display module, characterized in that, include: The assembly comprises a front mold plate (1), a front mold core (2), a rear mold plate (3), a rear mold core (4), and a demolding assembly (5); the front mold core (2) is fixed to the front mold plate (1); the rear mold core (4) is fixed to the rear mold plate (3); the front mold core (2) and the rear mold core (4) are respectively provided with a matching convex module (21) and a concave mold groove (41); the side wall of the concave mold groove (41) is provided with a connected flow channel (42), which is used to connect to external injection; the front mold plate (1) and the rear mold plate (3) can be pressed together in the front and rear directions, thereby synchronously pressing the convex module (21) and the concave mold groove (41), forming a filling cavity between the convex module (21) and the concave mold groove (41); the filling cavity is used to fill the adhesive. The demolding assembly (5) includes: a spring block (51) and a first elastic element (52); the front mold core (2) or the rear mold core is provided with a guide groove parallel to the front-back direction; the spring block (51) is slidably connected to the guide groove in the front-back direction, and can abut one end against the front mold core (2) or the rear mold core (4) without the guide groove; the other end of the spring block (51) is fixedly connected to the first elastic element (52), and can extend and retract against the front template (1) or the rear template (3) on the side with the guide groove.

2. The mold for manufacturing the frame of a liquid crystal display module according to claim 1, characterized in that, The front mold core (2) is provided with an ejector assembly on the side near the front template (1), or the rear mold core (4) is provided with an ejector assembly on the side near the rear template (3); The top adhesive assembly includes: a top plate (61), a pressure plate (62), and a plurality of ejector pins (63) distributed perpendicular to the front-rear direction; the top plate (61) and the pressure plate (62) are arranged adjacent to the front mold core (2) or the rear mold core (4) in sequence; the ejector pins (63) are perpendicular to the front-rear direction and one end is fixed to the top plate (61); the pressure plate (62) is provided with a plurality of first pin holes (621) that match the ejector pins (63); the convex module (21) or the concave mold groove (41) is provided with a plurality of second pin holes (411) that match the ejector pins (63); the other end of the ejector pins (63) passes through the first pin holes (621) and the second pin holes (411) in sequence, thereby being able to push the molding frame (100) between the front mold core (2) and the rear mold core.

3. The mold for manufacturing the frame of a liquid crystal display module according to claim 2, characterized in that, The front template (1) and the rear template (3) are respectively provided with a first fixing plate (7) and a second fixing plate (8) on the outer side in the front-rear direction; the first fixing plate (7) or the second fixing plate (8) on the side where the top adhesive assembly is provided is provided with a top hole (611); the first fixing plate (7) and the second fixing plate (8) are respectively provided with two mold corners (64); the pressure plate (62) is located on the inner side of the two mold corners.

4. The mold for manufacturing the frame of a liquid crystal display module according to claim 3, characterized in that, The pressure plate (62) is provided with a return needle (622) perpendicular to the front-back direction and a second elastic element (623); the front template (1) and the rear template (3) are respectively provided with a matching first return hole (11) and a second return hole (31); one end of the return needle (622) is fixed to the pressure plate (62), and the other end of the return needle (622) can pass through the first return hole (11) and the second return hole (31) and can abut against the first fixing plate (7) or the second fixing plate (8) without the top adhesive assembly; the second elastic element (623) is sleeved on the outer side of the return needle (622), and the diameter of the second elastic element (623) is larger than the diameter of the first return needle (622) hole and the second return needle (622) hole.

5. The mold for manufacturing the frame of a liquid crystal display module according to claim 1, characterized in that, The side of the convex module (21) is provided with a first piece (211); the thickness of the first piece (211) is smaller than the thickness of the convex module (21); the concave mold groove (41) is provided with a second piece (412) that matches the first piece (211).

6. The mold for manufacturing the frame of a liquid crystal display module according to claim 1, characterized in that, The cavity groove (41) is provided with an insert (413); the insert (413) is spaced from the side of the cavity groove (41), and the insert (413) protrudes 30-50 micrometers in a direction perpendicular to the front and back relative to the bottom of the cavity groove (41).

7. The mold for manufacturing the frame of a liquid crystal display module according to any one of claims 1-6, characterized in that, The demolding assembly (5) includes multiple sets of components respectively disposed around the convex module (21) and the concave mold groove (41).

8. The mold for manufacturing the frame of a liquid crystal display module according to any one of claims 1-6, characterized in that, The top block (51) is a four-sided column; the guide groove is a four-sided groove that matches the four-sided column.

9. The mold for manufacturing the frame of a liquid crystal display module according to any one of claims 1-6, characterized in that, The front template (1) and the rear template (3) are respectively provided with matching guide posts (32) and guide holes (12); the guide posts (32) are slidably connected to the guide posts (32) in the front-back direction.

10. An integrated plastic frame, characterized in that, The frame is injection molded using the frame manufacturing mold as described in any one of claims 1-9 for liquid crystal display modules; the thickness of the back panel of the frame (100) is ≤0.41mm; the thickness of the perimeter of the frame (100) is ≤0.47mm.

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