COF packaging structure of narrow-frame display screen

Abstract

The application relates to a COF packaging structure of a narrow-frame display screen, which comprises a display panel, a back plate module and a frame; the display panel comprises an upper substrate, a lower substrate and a sandwiched liquid crystal layer, the width of the upper substrate is smaller than that of the lower substrate, thereby forming a step difference; the back plate module comprises a glue frame, a film, a light guide plate and a reflecting sheet which are sequentially stacked, and the top of the glue frame is provided with a PCB; a flexible circuit board is three-dimensionally bent to connect the lower substrate and the PCB, and comprises: a side edge arc-shaped section with a bending radius of 1.5-3 mm and an inner surface provided with a polyimide reinforcing layer; a bottom surface linear section with a surface provided with parallel reinforcing ribs; a turning connecting portion with a first magnetic body embedded therein, a second magnetic body arranged at a corresponding position of the lower substrate and the glue frame, and the first magnetic body and the second magnetic body having the same polarity at adjacent ends. The application effectively reduces the frame thickness on the basis of maintaining the display quality of the narrow-frame liquid crystal module, and meets the design requirements of the ultra-thin display screen.

Description

Technical Field

[0001] This application relates to the field of liquid crystal display technology, and in particular to a COF packaging structure for a narrow bezel display screen. Background Technology

[0002] Today, to meet the demands of various high-density packaging, the semiconductor packaging industry has gradually developed various packaging designs. The design concepts of these different packaging structures are mostly aimed at making high-density packaged products thinner and more suitable for increasingly lightweight and compact electronic products, such as narrow-bezel LCD displays. In LCD modules using LED backlight modules, narrow bezel design is a trend. Currently, mature product modules can achieve bezel thicknesses of less than 5 millimeters (mm), and there is a design demand for even narrower bezels, especially in the design of large-size, high-resolution modules. To implement narrow bezel designs in LED LCD modules and to meet the demands of electronic products for thinner, smaller, more functional, and faster devices, driver chip packaging technology is also developing towards thinner thickness and smaller area, such as chip-on-film (COF) flexible packaging components.

[0003] Furthermore, with the rapid development of the panel industry, ultra-narrow bezels and borderless designs have become a major feature of modern panel displays. Ultra-narrow bezel designs result in increasingly smaller distances between the COF (Copyright Frame) and the glass substrate. Typically, in ultra-narrow bezel designs, the front face of the glass substrate (the COF connection face) is not ground. During testing, due to the assembly gap of the front frame and its own strength, it will exhibit small reciprocating offset movements when subjected to external impacts. This reciprocating disturbance to the COF causes it to be sheared by the glass substrate edge, making it highly susceptible to breakage and severely affecting the panel display. Chinese patent CN109407378B discloses a narrow bezel LCD module, comprising: a display panel including at least one upper glass substrate and a lower glass substrate; a backlight module including an optical film, a back plate, and at least one middle frame, wherein the back plate carries the optical film, and the middle frame surrounds the back plate and carries the display panel; a printed circuit board located on the surface of the middle frame; a front frame surrounding the middle frame and used to fix the display panel, and an accommodating space is formed between the front frame and the middle frame; a flexible encapsulation assembly located within the accommodating space; and two magnetic materials respectively located on the surface of the middle frame and on the flexible encapsulation assembly, wherein the two magnetic materials have opposite magnetic properties and are placed opposite each other.

[0004] In existing technologies, magnetic materials with opposite magnetic properties are bonded to the mid-frame and the flexible encapsulation component COF. The mutual repulsion between the two magnetic materials keeps the COF in a suspended position, thus avoiding wear on the COF. However, this design results in a thicker bezel for the entire display, which cannot meet the requirements of ultra-thin display designs. Furthermore, the magnetic repulsion in the design of using magnetic materials on the COF can easily cause magnetic field interference, affecting the display quality of narrow-bezel LCD modules. Summary of the Invention

[0005] In order to overcome the problems existing in the prior art, this application provides a COF packaging structure for a narrow bezel display.

[0006] The COF packaging structure for a narrow bezel display provided in this application adopts the following technical solution:

[0007] A COF (Coefficient of Fire) packaging structure for a narrow bezel display includes a display panel, a backplane module, and an outer frame. The display panel comprises an upper substrate, a lower substrate, and a sandwich liquid crystal layer, with the upper substrate having a narrower width than the lower substrate, forming a stepped difference. The backplane module includes a frame, a film, a light guide plate, and a reflective sheet stacked sequentially, with a PCB board on top of the frame. A flexible circuit board is three-dimensionally bent to connect the lower substrate and the PCB board, comprising: a side arc segment with a bending radius of 1.5-3mm and a polyimide reinforcing layer on its inner surface; a bottom straight segment with parallel reinforcing ribs on its surface; and a first magnetic body embedded at the bend connection, with a second magnetic body at corresponding positions on the lower substrate and the frame, the adjacent ends of the first and second magnetic bodies having the same polarity.

[0008] By adopting the above technical solution, the interlayer liquid crystal layer in the display panel achieves image display by controlling the deflection of liquid crystal molecules between the upper and lower substrates through an electric field. The step difference formed by the width of the upper substrate being smaller than that of the lower substrate creates conditions for a narrow bezel design. The reflective sheet of the back panel module reflects light, the light guide plate ensures uniform light distribution, and the film further optimizes the optical effect. The PCB board at the top of the frame serves as the core for signal transmission and circuit control. The flexible circuit board achieves three-dimensional bending through the curved sections on the sides with a bending radius of 1.5-3mm. The polyimide reinforcing layer enhances the structural strength of the curved sections, and the parallel reinforcement of the straight sections on the bottom surface... The robust design ensures stable transmission. The first magnetic material embedded in the bend connection repels the second magnetic material (with the same polarity at adjacent ends) at the corresponding positions on the lower substrate and the frame, helping the flexible circuit board maintain its bent shape. The mutual repulsion between the two magnetic materials keeps the flexible circuit board suspended in the middle between the lower substrate and the frame, avoiding wear and damage to the flexible circuit board. This ensures a stable connection between the lower substrate and the PCB board, enabling the transmission of display signals and functional control. Furthermore, the design of the curved segment combined with the straight segment on the bottom reduces the overall thickness of the bezel, meeting the requirements of ultra-thin display screen design.

[0009] Preferably, one end of the flexible circuit board is connected to the top surface of the lower substrate, and the other end is connected to the PCB board on the top of the frame. A space for accommodating the flexible circuit board is formed between the lower substrate and one side of the frame and the outer frame.

[0010] Preferably, the first and second magnetic bodies are surrounded by shielding covers, and the second magnetic bodies on the lower substrate and the frame correspond to each other. A chip is installed at the end of the straight section of the flexible circuit board away from the first and second magnetic bodies.

[0011] By adopting the above technical solution, one end of the flexible circuit board is connected to the top surface of the lower substrate, and the other end is connected to the PCB board. The polyimide reinforcing layer at the curved section bend on its side and the parallel reinforcing ribs on the straight section of the bottom surface ensure bending and transmission stability. The chip is installed at the end of the straight section away from the magnetic material, responsible for signal processing and conversion, avoiding interference from the first and second magnetic materials. A space is formed between the lower substrate and the frame on one side and the outer frame to accommodate the flexible circuit board. The first magnetic material at the bend connection and the second magnetic material (with the same polarity) at the corresponding positions on the lower substrate and the frame repel each other, helping the flexible circuit board maintain its bending state. The shielding cover around the perimeter prevents the magnetic materials from interfering with other components, thereby achieving stable signal transmission between the display panel and the PCB board and completing the normal operation of the display screen.

[0012] Preferably, a plate is also installed at the bottom of the back panel module, and a side plate connected to the outer frame is installed at the end of the plate. The glue frame is installed on the inner side of the side plate, and the top of the glue frame is bonded to the lower substrate with double-sided adhesive. A strip groove is opened at the bottom of the glue frame, and the two sides of the glue frame are adapted to the height of the side plate and the diaphragm, respectively. The height of the diaphragm is greater than the height of the side plate.

[0013] Preferably, the board body is a horizontal board body and is bonded to the side plate by thermally conductive adhesive. There is a space between the side plate and the lower substrate to accommodate the flexible circuit board and the turning connection. The bottom side of the side plate is provided with a T-shaped slide rail, which cooperates with the slots provided around the board body.

[0014] By adopting the above technical solution, the frame is installed inside the side panel, the top is bonded to the lower substrate with double-sided adhesive, and the bottom strip groove facilitates the internal structural layout while reducing the overall weight of the frame. Its height on both sides is adapted to the side panel and the diaphragm, respectively; the diaphragm being higher than the side panel allows for better optimization of optical effects. The board body serves as a horizontal base, firmly bonded to the side panel with thermally conductive adhesive. The space formed between the two and the outer frame accommodates the flexible circuit board and its bends, ensuring that one end of the flexible circuit board is connected to the side of the lower substrate, and the other end is stably connected to the PCB board. The polyimide reinforcement layer on the curved side and the parallel reinforcing ribs on the straight bottom section ensure reliable transmission. The chip performs signal processing and conversion away from magnetic materials. The T-shaped slide rail on the bottom side of the side panel precisely matches the slots around the board body for stable assembly. Simultaneously, the first and second magnetic bodies repel each other, helping the flexible circuit board maintain its bent shape. The shielding cover prevents magnetic interference, ultimately enabling all components of the display screen to work together and stably present the display image.

[0015] Preferably, the outer frame is attached to the side plate and the lower base plate respectively. The inner side of the outer frame is provided with a strip-shaped clip along its length. The outer side of the side plate is provided with a strip-shaped groove that matches it. The cross-section of the strip-shaped clip adopts an L-shaped structure. The inner side of the strip-shaped groove is provided with an elastic block for limiting the strip-shaped clip. The elastic block is connected to the side wall of the strip-shaped groove by an elastic element.

[0016] Preferably, the bottom of the side plate has a through hole for accommodating the unlocking mechanism, wherein the unlocking mechanism is slidably installed in the through hole for driving the elastic block to unlock the strip-shaped clip in the strip-shaped groove, and the outer end of the unlocking mechanism is horizontal with the bottom of the side plate.

[0017] Preferably, the strip-shaped groove is provided with a limiting groove for accommodating the elastic block and the elastic element, wherein the limiting groove is connected to the through hole for accommodating the unlocking mechanism, the bottom surface of the elastic block is an inclined surface facing the outside of the limiting groove, and the output end of the strip-shaped block and the unlocking mechanism are both provided with an inclined surface adapted to them.

[0018] Preferably, a limiting ring is provided at the connection between the perforation and the limiting groove, wherein there are not less than two sets of limiting rings in the array within the perforation, and the unlocking mechanism includes an unlocking button, wherein the unlocking button includes a drive rod and a pressing block, wherein the drive rod passes through the limiting ring, and the pressing block abuts against the limiting ring by a spring.

[0019] Preferably, the opening of the perforation has a circumferential array of limiting protrusions around it to limit the movement of the pressing block, wherein the outer side of the pressing block is provided with a positioning groove that is adapted to it.

[0020] By adopting the above technical solution, the display panel and back panel module components work together to achieve the display function, and the flexible circuit board completes the signal transmission. The outer frame is connected to the side panel via L-shaped strip clips and strip grooves. An elastic block, under the action of an elastic element, engages with the strip clip, restricting its movement within the groove and ensuring a stable installation of the outer frame and side panel. When the outer frame needs to be disassembled, pressing the unlock button horizontally located at the bottom of the side panel activates a drive rod that passes through a limiting ring, pushing the elastic block. Since the bottom surface of the elastic block, the strip clip, and the output end of the unlock mechanism are all fitted bevels, pressing the unlock button causes the elastic block to overcome the elastic force of the elastic element, retracting along the limiting groove and disengaging from the strip clip, allowing the outer frame to separate. The positioning groove on the outside of the pressing block engages with the limiting protrusions around the perforated opening, ensuring the unlock button remains stable and does not shift during pressing. After pressing, a spring pushes the pressing block back to its original position, and the elastic block returns to its original position under the action of the elastic element, awaiting the next connection. The entire process ensures convenient and stable installation and disassembly of the outer frame, guaranteeing the stability and maintainability of the display screen's encapsulation structure.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. This application achieves a step difference by making the width of the upper substrate of the display panel smaller than that of the lower substrate. The reasonable layout of the frame, film, light guide plate and reflective sheet in the back panel module, combined with the three-dimensional bending of the flexible circuit board to connect the lower substrate and the PCB board, the polyimide reinforcement layer of the side arc section, the parallel reinforcing ribs of the bottom straight section, and the magnetic body to assist bending, effectively reduces the bezel thickness while ensuring stable signal transmission, thus meeting the ultra-thin design requirements of the display screen.

[0023] 2. This application uses the fact that the adjacent ends of the first and second magnetic bodies have the same polarity, and with the surrounding shielding cover, it can not only help the flexible circuit board maintain its bending shape, but also reduce the magnetic field interference caused by magnetic repulsion. Compared with the design of opposite magnetics in the prior art, it improves the display quality of the narrow bezel LCD module.

[0024] 3. This application, through the structural design of the back panel bottom plate and side plate, and the connection and unlocking mechanism between the outer frame and the side plate composed of L-shaped strip clips and elastic blocks, makes the packaging structure stable and easy to disassemble and maintain. At the same time, the precise spatial layout and dimensional matching between the components further optimize the compactness and reliability of the overall structure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a COF packaging structure for a narrow bezel display screen;

[0026] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0027] Explanation of reference numerals in the attached drawings: 1. Display panel; 11. Upper substrate; 12. Lower substrate; 13. Interlayer liquid crystal layer; 2. Back panel module; 21. Adhesive frame; 211. Double-sided adhesive; 212. Strip groove; 22. Film; 23. Light guide plate; 24. Reflective sheet; 25. Panel body; 251. Slot; 26. Side plate; 261. T-shaped slide rail; 262. Strip groove; 2621. Limiting groove; 263. Elastic block; 264. Elastic element; 265. Perforation; 2651. Limiting ring; 2652. 266. Limiting protrusion; 2661. Unlocking mechanism; 2662. Unlocking button; 2663. Drive rod; 2664. Pressing block; 2665. Spring; 26666. Positioning groove; 3. Outer frame; 31. Strip clip; 4. Flexible circuit board; 41. Side arc segment; 411. Polyimide reinforcing layer; 42. Bottom straight segment; 421. Parallel reinforcing rib; 43. Turning connection; 431. First magnetic body; 432. Second magnetic body; 433. Shielding cover; 44. Chip; 5. PCB board. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0029] This application discloses a COF packaging structure for a narrow bezel display screen.

[0030] Reference Figure 1 and Figure 2A COF packaging structure for a narrow bezel display includes a display panel 1, a backplate module 2, and an outer frame 3. The display panel 1 includes an upper substrate 11, a lower substrate 12, and a sandwich liquid crystal layer 13. The width of the upper substrate 11 is smaller than that of the lower substrate 12, forming a step difference. The backplate module 2 includes a frame 21, a film 22, a light guide plate 23, and a reflective sheet 24 stacked sequentially. A PCB board 5 is provided on the top of the frame 21. A flexible circuit board 4 is three-dimensionally bent to connect the lower substrate 12 and the PCB board 5. It includes: a side arc segment 41 with a bending radius of 1.5 mm and a polyimide reinforcing layer 411 on the inner surface; a bottom straight segment 42 with parallel reinforcing ribs 421 on the surface; and a turning connection 43 with an embedded first magnetic body 431. A second magnetic body 432 is provided at the corresponding positions of the lower substrate 12 and the frame 21. The adjacent ends of the first magnetic body 431 and the second magnetic body 432 have the same polarity. In the display panel 1, the interlayer liquid crystal layer 13 achieves image display by controlling the deflection of liquid crystal molecules through an electric field between the upper and lower substrates 12. The step difference formed by the width of the upper substrate 11 being smaller than that of the lower substrate 12 creates conditions for a narrow bezel design. The reflective sheet 24 of the back panel module 2 reflects light, the light guide plate 23 distributes light evenly, and the film 22 further optimizes the optical effect. The PCB board 5 at the top of the frame 21 serves as the core for signal transmission and circuit control. The flexible circuit board 4 achieves three-dimensional bending with a bending radius of 1.5mm through the side arc segment 41. The polyimide reinforcing layer 411 enhances the structural strength of the arc segment, and the parallel reinforcing ribs 421 of the bottom straight segment 42 protect the structure. To ensure stable transmission, the first magnetic body 431 embedded in the bend connection 43 and the second magnetic body 432 (with the same polarity at adjacent ends) at the corresponding positions of the lower substrate 12 and the frame 21 repel each other, helping the flexible circuit board 4 to maintain its bent shape. The mutual repulsion between the two magnetic materials of the flexible circuit board 4 keeps it suspended in the middle of the lower substrate 12 and the frame 21, avoiding wear and damage to the flexible circuit board 4. This stably connects the lower substrate 12 and the PCB board 5, realizing the transmission of display signals and functional control. Furthermore, the design of the arc segment combined with the straight segment 42 on the bottom surface reduces the overall thickness of the bezel, meeting the requirements of the ultra-thin display design.

[0031] Reference Figure 1 and Figure 2One end of the flexible circuit board 4 is connected to the top surface of the lower substrate 12, and the other end is connected to the PCB board 5 on the top of the frame 21. A space for accommodating the flexible circuit board 4 is formed between the lower substrate 12, one side of the frame 21, and the outer frame 3. Shielding covers 433 are fitted around the first magnetic body 431 and the second magnetic body 432, and the second magnetic bodies 432 on the lower substrate 12 and the frame 21 correspond to each other. A chip 44 is installed at the end of the straight section of the flexible circuit board 4 away from the first magnetic body 431 and the second magnetic body 432. One end of the flexible circuit board 4 is connected to the top surface of the lower substrate 12, and the other end is connected to the PCB board 5. The polyimide reinforcing layer 411 at the bend of its side arc section 41 and the parallel reinforcing ribs 421 of the bottom straight section 42 ensure bending and transmission stability. The chip 44 is installed at the end of the straight section away from the magnetic material and is responsible for signal processing and conversion, avoiding interference from the first magnetic body 431 and the second magnetic body 432. A space is formed between the lower substrate 12 and one side of the frame 21 and the outer frame 3 to accommodate the flexible circuit board 4. The first magnetic body 431 at the bend connection 43 and the second magnetic body 432 (with the same polarity) at the corresponding positions of the lower substrate 12 and the frame 21 repel each other, helping the flexible circuit board 4 to maintain its bent state. The shielding cover 433 surrounding the circuit prevents the magnetic body from interfering with other components, thereby achieving stable signal transmission between the display panel 1 and the PCB board 5 and completing the normal operation of the display screen.

[0032] Reference Figure 1 and Figure 2The bottom of the backplate module 2 is also equipped with a plate 25. The end of the plate 25 is equipped with a side plate 26 that is connected to the outer frame 3. The adhesive frame 21 is installed on the inner side of the side plate 26, and the top of the adhesive frame 21 is bonded to the lower substrate 12 with double-sided adhesive 211. The bottom of the adhesive frame 21 has a strip groove 212, and the two sides of the adhesive frame 21 are adapted to the height of the side plate 26 and the diaphragm 22, respectively. The height of the diaphragm 22 is greater than the height of the side plate 26. The plate 25 is a horizontal plate 25 and is bonded to the side plate 26 with thermally conductive adhesive. There is a space between the side plate 26 and the lower substrate 12 to accommodate the flexible circuit board 4 and the turning connection 43. The bottom side of the side plate 26 is provided with a T-shaped slide rail 261, which cooperates with the slots 251 provided around the plate 25. The frame 21 is installed inside the side plate 26. The top is bonded to the lower substrate 12 with double-sided adhesive 211. The bottom strip groove 212 facilitates the internal structure layout and reduces the overall weight of the frame. The height of its two sides is adapted to the side plate 26 and the diaphragm 22, respectively. The diaphragm 22 is higher than the side plate 26 to better optimize the optical effect. The plate 25 serves as a horizontal base and is firmly bonded to the side plate 26 with thermally conductive adhesive. The space formed between the two and the outer frame 3 is used to accommodate the flexible circuit board 4 and its turning connection 43, ensuring that one end of the flexible circuit board 4 is connected to the side of the lower substrate 12 and the other end is stably connected to the PCB board 5. The side arc section 41 polyimide reinforcing layer 411 and the bottom straight section 42 parallel reinforcing ribs 421 ensure transmission reliability. The chip 44 performs signal processing and conversion at a location away from magnetic materials. The T-shaped slide rail 261 on the bottom side of the side panel 26 precisely matches the slots 251 around the plate 25 to achieve stable assembly. At the same time, the first magnetic body 431 and the second magnetic body repel each other to help the flexible circuit board 4 maintain its bent shape, and the shield 433 prevents magnetic interference. Ultimately, the various components of the display screen work together to stably present the display image.

[0033] Reference Figure 1 and Figure 2The outer frame 3 is attached to the side plate 26 and the lower base plate 12 respectively. The inner side of the outer frame 3 has a strip-shaped clip 31 along its length. The outer side of the side plate 26 has a strip-shaped groove 262 adapted to it. The strip-shaped clip 31 has an L-shaped cross-section. The inner side of the strip-shaped groove 262 has an elastic block 263 for limiting the strip-shaped clip 31. The elastic block 263 is connected to the side wall of the strip-shaped groove 262 by an elastic element 264. The bottom of the side plate 26 has a through hole 265 to accommodate the unlocking mechanism 266. The unlocking mechanism 266 is slidably installed in the through hole 265 to drive the elastic block 263 to unlock the strip-shaped clip 31 in the strip-shaped groove 262. The outer end of the unlocking mechanism 266 is horizontal with the bottom of the side plate 26. A limiting groove 2621 is formed within the strip-shaped groove 262 to accommodate the elastic block 263 and the elastic element 264. The limiting groove 2621 communicates with the through hole 265 accommodating the unlocking mechanism 266. The bottom surface of the elastic block 263 is an inclined surface facing outward from the limiting groove 2621, and both the strip-shaped clip 31 and the output end of the unlocking mechanism 266 are provided with matching inclined surfaces. A limiting ring 2651 is provided at the connection between the through hole 265 and the limiting groove 2621, wherein there are not less than two sets of limiting rings 2651 arrayed within the through hole 265. The unlocking mechanism 266 includes an unlocking button 2661, which includes a drive rod 2662 and a pressing block 2663. The drive rod 2662 passes through the limiting ring 2651, and the pressing block 2663 abuts against the limiting ring 2651 through a spring 2664. The opening of the perforation 265 has a circumferential array of limiting protrusions 2652 around it to limit the movement of the pressing block 2663. The outer side of the pressing block 2663 is provided with a matching positioning groove 2665. The components of the display panel 1 and the back panel module 2 work together to realize the display function, and the flexible circuit board 4 completes the signal transmission.The outer frame 3 is connected to the side plate 26 via an L-shaped strip clip 31. An elastic block 263, under the action of an elastic element 264, engages with the strip clip 31, restricting its movement within the strip groove 262, thus achieving a stable installation of the outer frame 3 and the side plate 26. When the outer frame 3 needs to be disassembled, pressing the horizontally positioned unlocking button 2661 at the bottom of the side plate 26 causes the drive rod 2662 to pass through the limiting ring 2651 and push the elastic block 263. Since the bottom surface of the elastic block 263, the strip clip 31, and the output end of the unlocking mechanism 266 are all adaptable inclined surfaces, pressing the unlocking button 2661 causes the elastic block 263 to engage. Block 263 overcomes the elastic force of elastic element 264 and retracts inward along the limiting groove 2621, disengaging from the limiting of strip clip 31, thus separating the outer frame 3. The positioning groove 2665 on the outside of the pressing block 2663 cooperates with the limiting protrusion 2652 around the opening of the perforation 265 to ensure that the unlocking button 2661 is stable and does not shift during the pressing process. After the pressing is completed, the spring 2664 pushes the pressing block 2663 to reset, and the elastic clip 263 returns to its original position under the action of elastic element 264, waiting for the next connection limiting. The whole process ensures that the outer frame 3 is easy to install and disassemble and the connection is stable, ensuring the stability and maintainability of the display packaging structure.

[0034] Working Process: During operation of the narrow bezel display COF packaging structure, all components work together. In the display panel 1, the upper substrate 11, the lower substrate 12, and the interlayer liquid crystal layer 13 constitute the display core. The step difference formed by the upper substrate 11 being narrower than the lower substrate 12 lays the foundation for the narrow bezel design. The interlayer liquid crystal layer 13 achieves image display by controlling the deflection of liquid crystal molecules through an electric field. In the back panel module 2, the reflective sheet 24, the light guide plate 23, and the film 22 are stacked sequentially. The reflective sheet 24 reflects light, the light guide plate 23 conducts and evenly distributes light, and the film 22 further optimizes the optical effect. The PCB board at the top of the frame 21 serves as the signal processing and circuit control center. One end of the flexible circuit board 4 is connected to the top surface of the lower substrate 12, and the other end is connected to the PCB board 5. Its side arc segment 41 achieves three-dimensional bending with a bending radius of 1.5mm. The polyimide reinforcing layer 411 enhances the structural strength. The parallel reinforcing ribs 421 of the straight segment 42 on the bottom surface ensure transmission stability. The first magnetic body 431 at the bend connection 43 and the second magnetic body 432 (with the same polarity) at the corresponding positions of the lower substrate 12 and the frame 21 repel each other, helping the flexible circuit board 4 to maintain its bent shape. The surrounding shield 433 prevents magnetic interference. The chip 44 completes signal processing and conversion at the straight segment away from the magnetic material. The board body 25 at the bottom of the back plate and the side plate 26 are bonded with thermally conductive adhesive. The T-shaped slide rail 261 at the bottom of the side plate 26 is assembled with the slot 251 of the board body 25. The space between the side plate 26 and the lower substrate 12 accommodates the flexible circuit board 4 and its bend. The outer frame 3 is connected to the side plate 26 via an L-shaped strip clip 31 and a strip groove 262. An elastic block 263, under the action of an elastic element 264, limits and fixes the outer frame 3 to the strip clip 31. When disassembly is required, pressing the unlock button 2661 at the bottom of the side plate 26 causes the drive rod 2662 to push the elastic block 263 inward, disengaging it from the limit, allowing the outer frame 3 to separate. The pressing block 2663 cooperates with the limiting protrusion 2652 to ensure stable operation, and automatically resets after pressing. Ultimately, this achieves stable display of the image on the screen, combining thinness, reliability, and ease of maintenance.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A COF packaging structure for a narrow bezel display screen, comprising a display panel (1), a back panel module (2), and an outer frame (3); characterized in that: The display panel (1) includes an upper substrate (11), a lower substrate (12) and a sandwich liquid crystal layer (13), wherein the width of the upper substrate (11) is smaller than that of the lower substrate (12) to form a step difference; The back panel module (2) includes a frame (21), a film (22) stacked in sequence, a light guide plate (23) and a reflective sheet (24), and a PCB board (5) is provided on the top of the frame (21). The flexible circuit board (4) is three-dimensionally bent to connect the lower substrate (12) and the PCB board (5), including: The side arc segment (41) has a bending radius of 1.5-3mm and a polyimide reinforcing layer (411) on its inner surface. The bottom straight section (42) has parallel reinforcing ribs (421) on its surface. At the junction (43), a first magnetic body (431) is embedded, and a second magnetic body (432) is provided at the corresponding position on the lower substrate (12) and the frame (21). The adjacent ends of the first magnetic body (431) and the second magnetic body (432) have the same polarity. One end of the flexible circuit board (4) is connected to the top surface of the lower substrate (12), and the other end is connected to the PCB board (5) on the top of the frame (21). One side of the lower substrate (12) and the frame (21) forms a gap with the outer frame (3). A space is formed to accommodate the flexible circuit board (4); shielding covers (433) are fitted around the first magnetic body (431) and the second magnetic body (432), and the second magnetic body (432) on the lower substrate (12) and the frame (21) correspond to each other. A chip (44) is installed at the end of the straight segment of the flexible circuit board (4) away from the first magnetic body (431) and the second magnetic body (432); a board body (25) is also installed at the bottom of the back panel module (2). The end of the frame is fitted with a side plate (26) connected to the outer frame (3); the outer frame (3) is respectively attached to the side plate (26) and the lower base plate (12). The inner side of the outer frame (3) is provided with a strip-shaped clip (31) along its length direction. The outer side of the side plate (26) is provided with a strip-shaped groove (262) that is adapted to it. The cross-section of the strip-shaped clip (31) adopts an L-shaped structure. The inner side of the strip-shaped groove (262) is provided with an elastic locking block (2) for limiting the strip-shaped clip (31). 63), the elastic block (263) is connected to the side wall of the strip groove (262) by an elastic element (264); the bottom of the side plate (26) is provided with a through hole (265) to accommodate the unlocking mechanism (266), wherein the unlocking mechanism (266) is slidably installed in the through hole (265) to drive the elastic block (263) to unlock the strip clip (31) in the strip groove (262), and the outer end of the unlocking mechanism (266) is horizontal with the bottom of the side plate (26).

2. The COF packaging structure for a narrow bezel display screen according to claim 1, characterized in that: The frame (21) is installed on the inside of the side plate (26), and the top of the frame (21) is bonded to the lower substrate (12) with double-sided adhesive (211). The bottom of the frame (21) has a strip groove (212), and the two sides of the frame (21) are adapted to the height of the side plate (26) and the diaphragm (22) respectively. The height of the diaphragm (22) is greater than the height of the side plate (26).

3. The COF packaging structure for a narrow bezel display screen according to claim 2, characterized in that: The plate (25) is a horizontal plate (25) and is bonded to the side plate (26) by thermally conductive adhesive. There is a space between the side plate (26) and the lower substrate (12) to accommodate the flexible circuit board (4) and the turning connection (43). The bottom side of the side plate (26) is provided with a T-shaped slide rail (261), which cooperates with the slot (251) provided around the plate (25).

4. The COF packaging structure for a narrow bezel display screen according to claim 1, characterized in that: The strip-shaped groove (262) is provided with a limiting groove (2621) for accommodating the elastic block (263) and the elastic element (264). The limiting groove (2621) is connected to the through hole (265) for accommodating the unlocking mechanism (266). The bottom surface of the elastic block (263) is an inclined surface facing the outside of the limiting groove (2621), and the output end of the strip-shaped clip (31) and the unlocking mechanism (266) are both provided with an inclined surface that is adapted to them.

5. The COF packaging structure for a narrow bezel display screen according to claim 4, characterized in that: A limiting ring (2651) is provided at the connection between the perforation (265) and the limiting groove (2621), wherein there are not less than two sets of limiting rings (2651) in the perforation (265). The unlocking mechanism (266) includes an unlocking button (2661), the unlocking button (2661) includes a drive rod (2662) and a pressing block (2663), wherein the drive rod (2662) passes through the limiting ring (2651), and the pressing block (2663) abuts against the limiting ring (2651) through a spring (2664).

6. The COF packaging structure for a narrow bezel display screen according to claim 5, characterized in that: The opening of the perforation (265) has a circumferential array of limiting protrusions (2652) around the opening to limit the pressing block (2663), wherein the outer side of the pressing block (2663) is provided with a positioning groove (2665) that is adapted to it.

Images