COF packaging structure of narrow-frame display screen

Abstract

The invention relates to a COF packaging structure of a narrow-frame display screen. The COF packaging structure comprises a display panel, a backboard module and an outer frame. The display panel comprises an upper substrate, a lower substrate and an interlayer liquid crystal layer. The width of the upper substrate is smaller than that of the lower substrate to form a step difference. The back plate module comprises a rubber frame, a diaphragm, a light guide plate and a reflector plate, wherein the diaphragm, the light guide plate and the reflector plate are sequentially stacked. A PCB is arranged on the top of the rubber frame. The flexible circuit board is connected with the lower substrate and the PCB in a three-dimensional bending mode and comprises a side edge arc-shaped section, the bending radius of the side edge arc-shaped section ranges from 1.5 mm to 3 mm, and a polyimide reinforcing layer is arranged on the inner surface of the side edge arc Parallel reinforcing ribs are arranged on the surface of the bottom surface linear section; a first magnetic body is embedded in the turning joint, a second magnetic body is arranged at the position, corresponding to the rubber frame, of the lower substrate, and the adjacent ends of the first magnetic body and the second magnetic body are the same in polarity. On the basis of keeping the display quality of the narrow-frame liquid crystal module, the frame thickness is effectively reduced, and the ultra-thin design requirement of a display screen is met.

Description

Technical Field

[0001] The present application relates to the field of liquid crystal display technology, and in particular to a COF packaging structure for a narrow-frame display screen. Background Art

[0002] To meet the demands of various high-density packaging, the semiconductor packaging industry has developed a variety of packaging designs. These various packaging structures are primarily designed to make high-density packaged products thinner, making them suitable for use in increasingly thin and compact electronic products, such as narrow-bezel LCDs. Narrow-bezel designs are a trend in LCD modules using light-emitting diode (LED) backlights. Currently, mature modules have bezels less than 5 mm thick, and there is a demand for even narrower bezels, particularly in large-size, high-resolution module designs. To implement narrow-bezel designs in LED LCD modules and respond to the trend toward thinner, more compact, more functional, and faster electronic products, chip packaging technology is also evolving toward thinner and smaller footprints, such as chip-on-film (COF) flexible packaging.

[0003] Furthermore, with the rapid development of the panel industry, ultra-narrow and borderless designs have become a major feature of modern panel displays. Ultra-narrow bezel designs reduce the distance between the COF and the glass substrate. Typically, in ultra-narrow bezel designs, the front surface of the glass substrate (the COF connection end) is not edge-polished. During testing, due to factors such as the front frame assembly gap and its own strength, small reciprocating offsets can occur when subjected to external impact forces. This reciprocating motion disrupts the COF, causing it to be sheared by the edge of the glass substrate, making it very susceptible to COF breakage and seriously affecting the panel display. Chinese patent CN109407378B discloses a narrow-border liquid crystal module, comprising: a display panel comprising at least one upper glass substrate and a lower glass substrate; a backlight module comprising an optical film, a backplane, and at least one middle frame, wherein the backplane carries the optical film, and the middle frame surrounds the backplane 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, with a housing formed between the front frame and the middle frame; a flexible packaging component located in the housing space; and two magnetic materials located on the surface of the middle frame and on the flexible packaging component, respectively, wherein the two magnetic materials have opposite magnetic properties and are positioned opposite each other.

[0004] In the prior art, magnetic materials with opposite magnetic properties are bonded to the middle frame and the flexible packaging component COF, and the mutual repulsion between the two magnetic materials is used to keep the COF in a suspended position, thereby avoiding wear on the COF. However, such a design makes the frame of the entire display thicker, which cannot meet the requirements of ultra-thin display design. In addition, the magnetic repulsion force of the magnetic material on the COF is prone to cause magnetic field interference, affecting the display quality of the narrow-frame LCD module. Summary of the Invention

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

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

[0007] A COF packaging structure for a narrow-frame display screen comprises a display panel, a backplane module, and an outer frame. The display panel comprises an upper substrate, a lower substrate, and an interlayer liquid crystal layer, wherein the width of the upper substrate is smaller than that of the lower substrate, forming a step difference. The backplane module comprises a plastic frame, a diaphragm stacked in sequence, a light guide plate, and a reflector, with a PCB provided on top of the plastic frame. The flexible circuit board is three-dimensionally bent to connect the lower substrate and the PCB, and comprises: side arcuate sections with a bending radius of 1.5-3mm and a polyimide reinforcement layer provided on the inner surface; a bottom straight section with parallel reinforcing ribs provided on the surface; a first magnetic body embedded in the turning connection, and a second magnetic body provided at corresponding positions of the lower substrate and the plastic frame, wherein the adjacent ends of the first and second magnetic bodies have the same polarity.

[0008] By adopting the above technical solution, the interlayer liquid crystal layer in the display panel realizes image display by controlling the deflection of liquid crystal molecules through the electric field between the upper and lower substrates. The width of the upper substrate is smaller than the step difference formed by the lower substrate, which creates conditions for narrow frame design; the reflector of the backplane module reflects the light, the light guide plate makes the light evenly distributed, and the membrane further optimizes the optical effect. The PCB board on the top of the plastic frame serves as the core of signal transmission and circuit control; the flexible circuit board realizes three-dimensional bending with a bending radius of 1.5-3mm through the side arc segment, the polyimide reinforcement layer enhances the structural strength of the arc segment, and the parallel reinforcement of the bottom straight segment Strong ribs ensure transmission stability. The first magnetic body embedded in the turning connection and the second magnetic body at the corresponding position of the lower substrate and the plastic frame (adjacent ends have the same polarity) repel each other, helping the flexible circuit board to maintain its bent shape. The mutual repulsive force of the two magnetic materials of the flexible circuit board causes it to be suspended in the middle of the lower substrate and the plastic frame, avoiding wear and damage to the flexible circuit board, thereby stably connecting the lower substrate and the PCB board, realizing display signal transmission and function control, and through the design of the arc segment and the straight line segment on the bottom, the overall thickness of the frame is reduced to meet the requirements of ultra-thin design of the display.

[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 plastic frame. A space for accommodating the flexible circuit board is formed between the lower substrate, one side of the plastic frame and the outer frame.

[0010] Preferably, a shielding cover is mounted around the first and second magnetic bodies, and the lower substrate corresponds to the second magnetic body on the plastic frame, and a chip is mounted on one 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. The polyimide reinforcement layer at the bend of the curved side section and the parallel reinforcement ribs on the straight section of the bottom surface ensure bending and transmission stability. The chip is mounted on the end of the straight section away from the magnetic material, responsible for signal processing and conversion, and preventing interference from the first and second magnetic bodies. A space is formed between the lower substrate and the plastic frame on one side and the outer frame to accommodate the flexible circuit board. The first magnetic body at the turning point and the second magnetic body (with the same polarity) at the corresponding position of the lower substrate and plastic frame repel each other, helping the flexible circuit board maintain its bent state. The shielding cover surrounding the flexible circuit board prevents interference from the magnetic body on other components, thereby achieving stable signal transmission between the display panel and the PCB, and completing the normal operation of the display screen.

[0012] Preferably, a plate body is also installed at the bottom of the back panel module, and side panels connected to the outer frame are installed at the ends of the plate body, wherein the rubber frame is installed on the inner side of the side panel, and the top of the rubber frame is bonded to the lower substrate by double-sided tape, and a strip groove is opened at the bottom of the rubber frame, and the two sides of the rubber frame are respectively adapted to the height of the side panel and the diaphragm, and the height of the diaphragm is greater than the height of the side panel.

[0013] Preferably, the plate body is a horizontal plate body and is bonded to the side plate by thermal conductive glue. A space for accommodating the flexible circuit board and the turning connection is provided between the side plate and the lower base plate. A T-shaped slide rail is provided on the bottom side of the side plate, and the T-shaped slide rail cooperates with the card slot provided around the plate body.

[0014] By adopting the above technical solution, the adhesive frame is installed on the inner side of the side panel, with the top bonded to the lower substrate with double-sided tape. The bottom strip groove facilitates internal structural layout while reducing the overall weight of the frame. The height of its two sides is adapted to the side panels and diaphragm, respectively. The diaphragm is higher than the side panels to better optimize the optical effect. The plate body serves as a horizontal base and is firmly bonded to the side panels with thermally conductive adhesive. The space formed between the two and the outer frame is used to accommodate the flexible circuit board and its turning connection, 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. The polyimide reinforcement layer on the curved side section and the parallel reinforcement ribs on the straight bottom section ensure transmission reliability, and the chip performs signal processing and conversion away from magnetic materials. The T-shaped slide rails on the bottom side of the side panel precisely match the slots around the plate body for stable assembly. At the same time, the mutual repulsion between the first and second magnetic bodies helps the flexible circuit board maintain its bent shape, and the shielding cover prevents magnetic interference. Ultimately, the various components of the display work together to present a stable display image.

[0015] Preferably, the outer frame is respectively attached to the side panels and the lower base panel, the inner side surface of the outer frame is provided with a strip clip along its length direction, and the outer side surface of the side panel is provided with a strip groove adapted thereto, wherein the cross-section of the strip clip adopts an L-shaped structure, and the inner side surface of the strip groove is provided with an elastic card block for limiting the strip clip, and the elastic card block is connected to the side wall of the strip groove by an elastic part.

[0016] Preferably, a through hole is provided at the bottom of the side panel to accommodate an unlocking mechanism, wherein the unlocking mechanism is slidably installed in the through hole to drive the elastic card block to unlock the strip clip in the strip groove, and the outer end of the unlocking mechanism is horizontal with the bottom of the side panel.

[0017] Preferably, a limiting groove for accommodating the elastic card block and the elastic part is opened in the strip-shaped groove, wherein the limiting groove is connected to the through-hole for accommodating the unlocking mechanism, the bottom surface of the elastic card block adopts an inclined surface facing the outside of the limiting groove, and the output ends of the strip-shaped clip and the unlocking mechanism are provided with inclined surfaces adapted thereto.

[0018] Preferably, a limiting ring is provided at the connection between the perforation and the limiting groove, wherein there are no less than two groups of limiting rings in the array within the perforation, and the unlocking mechanism includes an unlocking button, and the unlocking button includes a driving rod and a pressing block, wherein the driving rod passes through the limiting ring, and the pressing block abuts against the limiting ring through a spring.

[0019] Preferably, a circular array around the perforated opening is provided with limiting protrusions for limiting the pressing block, wherein the outer side of the pressing block is provided with a positioning groove adapted thereto.

[0020] By adopting the above technical solution, the display panel and the components of the backplane module work together to realize the display function, and the flexible circuit board completes the signal transmission. The outer frame is connected with the strip groove on the side panel through the strip clip of the L-shaped cross-section, and the elastic card block is stuck in the strip clip under the action of the elastic member, limiting its movement in the strip groove, so that the outer frame and the side panel are firmly installed; when the outer frame needs to be removed, the unlocking button arranged horizontally at the bottom of the side panel is pressed, and the driving rod passes through the limiting ring to push the elastic card block. Since the bottom surface of the elastic card block, the strip clip and the output end of the unlocking mechanism are all adapted inclined surfaces, pressing the unlocking button causes the elastic card block to overcome the elastic force of the elastic member, shrink inward along the limiting groove, and break away from the limitation of the strip clip, and the outer frame can be separated; the positioning groove on the outer side of the pressing block cooperates with the limiting protrusions around the perforated opening to ensure that the unlocking button is stable and does not deviate during the pressing process. After the pressing is completed, the spring pushes the pressing block to reset, and the elastic card block returns to its original position under the action of the elastic member, waiting for the next connection limit. The whole process ensures that the outer frame is easy to install and disassemble and the connection is firm, and guarantees the stability and maintainability of the display packaging structure.

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

[0022] 1. This application utilizes a step difference formed by making the width of the upper substrate of the display panel smaller than that of the lower substrate. The rational layout of the plastic frame, diaphragm, light guide plate, and reflector in the backplane module, along with the three-dimensional bending of the flexible circuit board to connect the lower substrate and the PCB, a polyimide reinforcement layer in the curved side sections, parallel reinforcement ribs in the straight bottom sections, and magnetic materials to assist in the bending, effectively reduces the bezel thickness while ensuring stable signal transmission, thus meeting the requirements of an ultra-thin display design.

[0023] 2. This application utilizes the first and second magnetic bodies with the same polarity at adjacent ends, combined with a surrounding shield, to help the flexible circuit board maintain its bent shape while reducing magnetic field interference caused by magnetic repulsion. Compared to existing designs with opposite magnetic properties, this improves the display quality of narrow-frame LCD modules.

[0024] 3. This application uses the structural design of the back panel bottom plate and side panels, as well as the connection and unlocking mechanism between the outer frame and the side panels through L-shaped strip clips, elastic blocks, etc., to ensure that the packaging structure is firmly assembled and easy to disassemble and maintain. At the same time, the precise spatial layout and dimensional coordination between the components further optimize the compactness and reliability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the COF packaging structure of a narrow-frame display;

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

[0027] Explanation of reference numerals: 1. display panel; 11. upper substrate; 12. lower substrate; 13. interlayer liquid crystal layer; 2. backplane module; 21. plastic frame; 211. double-sided tape; 212. strip groove; 22. diaphragm; 23. light guide plate; 24. reflector; 25. plate; 251. card slot; 26. side plate; 261. T-shaped slide rail; 262. strip groove; 2621. limit groove; 263. elastic block; 264. elastic member; 265. perforation; 2651. limit ring; 2652. Limiting protrusion; 266, unlocking mechanism; 2661, unlocking button; 2662, driving rod; 2663, pressing block; 2664, spring; 2665, positioning groove; 3, outer frame; 31, strip clip; 4, flexible circuit board; 41, side arc segment; 411, polyimide reinforcement layer; 42, bottom straight segment; 421, parallel reinforcing ribs; 43, turning connection; 431, first magnetic body; 432, second magnetic body; 433, shielding cover; 44, chip; 5, PCB board. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-2 This application is described in further detail.

[0029] The embodiments of the present application disclose a COF packaging structure for a narrow-border display screen.

[0030] Reference Figure 1 and Figure 2A COF packaging structure for a narrow-border display screen includes a display panel 1, a backplane module 2 and an outer frame 3; the display panel 1 includes an upper substrate 11, a lower substrate 12 and an interlayer liquid crystal layer 13, the width of the upper substrate 11 is smaller than that of the lower substrate 12 to form a step difference; the backplane module 2 includes a plastic frame 21, a diaphragm 22 stacked in sequence, a light guide plate 23 and a reflector 24, and a PCB board 5 is provided on the top of the plastic frame 21; the flexible circuit board 4 is three-dimensionally bent to connect the lower substrate 12 and the PCB board 5, including: a side arc segment 41 with a bending radius of 1.5mm and a polyimide reinforcement layer 411 on the inner surface; a bottom straight segment 42 with parallel reinforcement ribs 421 on the surface; a turning connection 43 with a first magnetic body 431 embedded therein, and a second magnetic body 432 is provided at the corresponding position of the lower substrate 12 and the plastic frame 21, and the adjacent ends of the first magnetic body 431 and the second magnetic body 432 have the same polarity. The interlayer liquid crystal layer 13 in the display panel 1 realizes image display by controlling the deflection of liquid crystal molecules through the electric field between the upper and lower substrates 12. The width of the upper substrate 11 is smaller than the step difference formed by the lower substrate 12, which creates conditions for a narrow frame design; the reflective sheet 24 of the backplane module 2 reflects the light, the light guide plate 23 makes the light evenly distributed, and the diaphragm 22 further optimizes the optical effect. The PCB board 5 on the top of the plastic frame 21 serves as the core of signal transmission and circuit control; the flexible circuit board 4 realizes three-dimensional bending with a bending radius of 1.5mm through the side arc segment 41, the polyimide reinforcement layer 411 enhances the structural strength of the arc segment, and the parallel reinforcement ribs 421 of the bottom straight segment 42 ensure To ensure transmission stability, the first magnetic body 431 embedded in the turning connection 43 and the second magnetic body 432 (adjacent ends have the same polarity) at the corresponding positions of the lower substrate 12 and the plastic frame 21 repel each other, helping the flexible circuit board 4 to maintain the bent shape. The mutual repulsive force of the two magnetic substances of the flexible circuit board 4 causes it to be suspended in the middle of the lower substrate 12 and the plastic frame 21, avoiding wear and damage to the flexible circuit board 4, thereby stably connecting the lower substrate 12 and the PCB board 5, realizing display signal transmission and function control, and through the design of the arc segment combined with the bottom straight segment 42, the overall thickness of the frame is reduced to meet the requirements of ultra-thin design of the display screen.

[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 5 on top of the plastic frame 21. A space is formed between the lower substrate 12, one side of the plastic frame 21, and the outer frame 3 to accommodate the flexible circuit board 4. A shielding cover 433 surrounds the first and second magnetic bodies 431, 432, and the second magnetic body 432 on the lower substrate 12 and plastic frame 21 corresponds to the second magnetic body 432. A chip 44 is mounted on the end of the straight section of the flexible circuit board 4, away from the first and second magnetic bodies 431, 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 5. A polyimide reinforcement layer 411 at the bend of the curved side section 41 and parallel reinforcement ribs 421 on the bottom straight section 42 ensure bending and transmission stability. Chip 44, mounted on the end of the straight section away from the magnetic material, is responsible for signal processing and conversion, preventing interference from the first and second magnetic bodies 431, 432. A space is formed between the lower substrate 12, one side of the plastic frame 21, and the outer frame 3 to accommodate the flexible circuit board 4. The first magnetic body 431 at the turning connection 43 and the second magnetic body 432 (with the same polarity) at the corresponding position of the lower substrate 12 and the plastic frame 21 repel each other, helping the flexible circuit board 4 to maintain its bent state. The shielding cover 433 set around it prevents the magnetic body from interfering with other components, thereby achieving stable signal transmission between the display panel 1 and the PCB board 5, completing the normal operation of the display screen.

[0032] Reference Figure 1 and Figure 2The bottom of the backplane module 2 is also mounted with a plate body 25. The ends of the plate body 25 are mounted with side panels 26 connected to the outer frame 3. A rubber frame 21 is mounted on the inner side of the side panels 26, and the top of the rubber frame 21 is bonded to the lower substrate 12 via double-sided tape 211. A strip-shaped groove 212 is defined at the bottom of the rubber frame 21, and the sides of the rubber frame 21 are adapted to the heights of the side panels 26 and the diaphragm 22, respectively. The height of the diaphragm 22 is greater than the height of the side panels 26. The plate body 25 is horizontal and bonded to the side panels 26 via thermally conductive adhesive. A space is provided between the side panels 26 and the lower substrate 12 to accommodate the flexible circuit board 4 and the transition joint 43. T-shaped rails 261 are provided on the bottom side of the side panels 26, and the T-shaped rails 261 engage with the slots 251 provided around the plate body 25. The glue frame 21 is installed on the inner side of the side panel 26, and the top is bonded to the lower substrate 12 with double-sided tape 211. The bottom strip groove 212 facilitates the internal structure layout and reduces the overall weight of the frame. The heights of its two sides are respectively adapted to the side panels 26 and the diaphragm 22. The diaphragm 22 is higher than the side panels 26 to better optimize the optical effect; the plate body 25 serves as a horizontal base and is firmly bonded to the side panels 26 through thermal 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 polyimide reinforcement layer 411 of the side arc segment 41 and the parallel reinforcement ribs 421 of the bottom straight segment 42 ensure transmission reliability. The chip 44 performs signal processing and conversion away from magnetic substances. The T-shaped slide rail 261 on the bottom side of the side panel 26 precisely matches the slots 251 around the plate body 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 shielding cover 433 prevents magnetic interference, ultimately achieving the coordinated work of various components of the display screen and stably presenting the display image.

[0033] Reference Figure 1 and Figure 2The outer frame 3 is attached to the side panels 26 and the lower base plate 12, respectively. The inner side surface of the outer frame 3 is provided with a strip clip 31 along its length, and the outer side surface of the side panel 26 is provided with a strip groove 262 adapted thereto. The cross-section of the strip clip 31 adopts an L-shaped structure. The inner side surface of the strip groove 262 is provided with an elastic block 263 for limiting the position of the strip clip 31. The elastic block 263 is connected to the side wall of the strip groove 262 by an elastic member 264. The bottom of the side panel 26 is provided with a through hole 265 for accommodating an unlocking mechanism 266. The unlocking mechanism 266 is slidably mounted in the through hole 265 to drive the elastic block 263 to unlock the strip clip 31 in the strip groove 262. The outer end of the unlocking mechanism 266 is parallel to the bottom of the side panel 26. A retaining groove 2621 is defined within the strip-shaped groove 262 to accommodate the elastic block 263 and the elastic member 264. The retaining groove 2621 communicates with a through-hole 265 that accommodates the unlocking mechanism 266. The bottom surface of the elastic block 263 is inclined toward the outside of the retaining 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 retaining ring 2651 is located at the junction of the through-hole 265 and the retaining groove 2621. There are at least two sets of retaining rings 2651 arrayed within the through-hole 265. The unlocking mechanism 266 includes an unlocking button 2661, which includes a driving rod 2662 and a pressing block 2663. The driving rod 2662 extends through the retaining ring 2651, and the pressing block 2663 abuts against the retaining ring 2651 via a spring 2664. The opening of the through hole 265 is surrounded by a circumferential array of limiting protrusions 2652 for limiting the pressing block 2663. The outer side of the pressing block 2663 is provided with a positioning groove 2665 adapted thereto. The display panel 1 and the backplane module 2 cooperate to realize the display function, and the flexible circuit board 4 completes the signal transmission.The outer frame 3 is connected to the strip groove 262 on the side panel 26 through the strip clip 31 of the L-shaped cross section. The elastic block 263 is clamped into the strip clip 31 under the action of the elastic member 264, limiting its movement in the strip groove 262, thereby achieving a stable installation of the outer frame 3 and the side panel 26. When it is necessary to remove the outer frame 3, the unlocking button 2661 horizontally arranged at the bottom of the side panel 26 is pressed, and the driving rod 2662 passes through the limiting ring 2651 to 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 adapted inclined surfaces, pressing the unlocking button 2661 allows the elastic block 263 to be released. Block 263 overcomes the elastic force of the elastic member 264, retracts along the limit groove 2621, and disengages from the limit of the strip clip 31, and the outer frame 3 can be separated; the positioning groove 2665 on the outside of the pressing block 2663 cooperates with the limit protrusions 2652 around the opening of the through-hole 265 to ensure that the unlocking button 2661 is stable and does not deviate during the pressing process. After the pressing is completed, the spring 2664 pushes the pressing block 2663 to reset, and the elastic card block 263 returns to its original position under the action of the elastic member 264, waiting for the next connection limit. The whole process ensures that the outer frame 3 is easy to install and disassemble and the connection is firm, ensuring the stability and maintainability of the display packaging structure.

[0034] Working Process: When the COF packaging structure of this narrow-frame display screen is in operation, all components work in concert. In the display panel 1, the upper substrate 11, lower substrate 12, and interlayer liquid crystal layer 13 form the display core. The step difference formed by the narrower upper substrate 11 than the lower substrate 12 lays the foundation for the narrow-frame design. The interlayer liquid crystal layer 13 controls the deflection of liquid crystal molecules through an electric field to achieve image display. Within the backplane module 2, the reflector 24, light guide plate 23, and diaphragm 22 are stacked in sequence. The reflector 24 reflects light, the light guide plate 23 conducts and evenly distributes light, and the diaphragm 22 further optimizes the optical effect. The PCB board on top of the plastic 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 5. Its curved side section 41 achieves three-dimensional bending with a 1.5mm bend radius. A polyimide reinforcement layer 411 enhances structural strength. Parallel reinforcing ribs 421 on the bottom straight section 42 ensure transmission stability. The first magnetic element 431 at the junction 43 and the second magnetic element 432 (with the same polarity) at the corresponding locations on the lower substrate 12 and the plastic frame 21 repel each other, helping the flexible circuit board 4 maintain its bent shape. A shielding cover 433 around the junction prevents magnetic interference. The chip 44 performs signal processing and conversion in the straight section, away from magnetic materials. The plate body 25 and side panels 26 at the bottom of the backplane are bonded together with thermally conductive adhesive. T-shaped rails 261 at the bottom of the side panels 26 mate with the slots 251 of the plate body 25. The space between the side panels 26 and the lower substrate 12 accommodates the flexible circuit board 4 and its junction. The outer frame 3 is connected to the strip groove 262 of the side panel 26 via an L-shaped strip clip 31. The elastic block 263, under the action of the elastic member 264, limits the position of the strip clip 31 and fixes the outer frame 3. To disassemble, the unlocking button 2661 at the bottom of the side panel 26 is pressed. The driving rod 2662 pushes the elastic block 263 inward to release the limit, and the outer frame 3 can be separated. The pressing block 2663 cooperates with the limiting protrusion 2652 to ensure stable operation, and the outer frame 3 automatically resets after pressing. This ultimately achieves a stable display screen that is both lightweight, reliable, and easy to maintain.

[0035] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A COF packaging structure for a narrow-frame display screen, comprising a display panel (1), a backplane module (2), and an outer frame (3); characterized in that: The display panel (1) comprises an upper substrate (11), a lower substrate (12) and an interlayer liquid crystal layer (13); the width of the upper substrate (11) is smaller than that of the lower substrate (12) to form a step difference; The backplane module (2) comprises a plastic frame (21), membrane sheets (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 plastic frame (21); The flexible circuit board (4) is three-dimensionally bent to connect the lower substrate (12) and the PCB board (5), and comprises: a side arc section (41) with a bending radius of 1.5-3 mm and a polyimide reinforcement layer (411) provided on the inner surface; The bottom straight section (42) is provided with parallel reinforcing ribs (421) on the surface; A first magnetic body (431) is embedded in the turning connection (43), and a second magnetic body (432) is provided at corresponding positions of the lower substrate (12) and the rubber frame (21). The adjacent ends of the first magnetic body (431) and the second magnetic body (432) have the same polarity.

2. The COF packaging structure for a narrow-border display screen according to claim 1, wherein: 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 plastic frame (21); a space for accommodating the flexible circuit board (4) is formed between one side of the lower substrate (12) and the plastic frame (21) and the outer frame (3).

3. The COF packaging structure for a narrow-border display screen according to claim 2, wherein: The first magnetic body (431) and the second magnetic body (432) are surrounded by a shielding cover (433), and the lower substrate (12) corresponds to the second magnetic body (432) on the plastic frame (21). A chip (44) is installed at one end of the straight section of the flexible circuit board (4) away from the first magnetic body (431) and the second magnetic body (432).

4. The COF packaging structure for a narrow-border display screen according to claim 1, wherein: The bottom of the back panel module (2) is also provided with a plate body (25), and the end of the plate body (25) is provided with a side panel (26) connected to the outer frame (3), wherein the rubber frame (21) is provided on the inner side of the side panel (26), and the top of the rubber frame (21) is bonded to the lower substrate (12) by means of a double-sided adhesive tape (211), a strip groove (212) is provided at the bottom of the rubber frame (21), and the two sides of the rubber frame (21) are respectively adapted to the height of the side panel (26) and the diaphragm (22), and the height of the diaphragm (22) is greater than the height of the side panel (26).

5. The COF packaging structure for a narrow-border display screen according to claim 4, wherein: The plate body (25) is a horizontal plate body (25) and is bonded to the side plate (26) by heat-conducting adhesive. A space for accommodating the flexible circuit board (4) and the turning connection (43) is provided between the side plate (26) and the lower base plate (12). A T-shaped slide rail (261) is provided on the bottom side of the side plate (26). The T-shaped slide rail (261) cooperates with the card slots (251) provided around the plate body (25).

6. The COF packaging structure for a narrow-border display screen according to claim 1, wherein: The outer frame (3) is respectively attached to the side plate (26) and the lower base plate (12); the inner side surface of the outer frame (3) is provided with a strip clip (31) along its length direction; the outer side surface of the side plate (26) is provided with a strip groove (262) adapted thereto; wherein the cross section of the strip clip (31) adopts an L-shaped structure; the inner side surface of the strip groove (262) is provided with an elastic block (263) for limiting the position of the strip clip (31); the elastic block (263) is connected to the side wall of the strip groove (262) via an elastic member (264).

7. The COF packaging structure for a narrow-border display screen according to claim 6, wherein: The bottom of the side plate (26) is provided with a through hole (265) for accommodating an unlocking mechanism (266), wherein the unlocking mechanism (266) is slidably installed in the through hole (265) for driving 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).

8. The COF packaging structure of a narrow-border display screen according to claim 7, characterized in that: A limiting groove (2621) for accommodating the elastic block (263) and the elastic member (264) is provided in the strip-shaped groove (262), wherein the limiting groove (2621) is communicated with the through hole (265) for accommodating the unlocking mechanism (266); the bottom surface of the elastic block (263) is provided with an inclined surface facing the outside of the limiting groove (2621), and the output ends of the strip-shaped clip (31) and the unlocking mechanism (266) are both provided with inclined surfaces adapted thereto.

9. The COF packaging structure for a narrow-border display screen according to claim 8, wherein: A limiting ring (2651) is provided at the connection between the through hole (265) and the limiting groove (2621), wherein there are no less than two groups of limiting rings (2651) arrayed in the through hole (265), and the unlocking mechanism (266) includes an unlocking button (2661), and the unlocking button (2661) includes a driving rod (2662) and a pressing block (2663), wherein the driving rod (2662) passes through the limiting ring (2651), and the pressing block (2663) abuts against the limiting ring (2651) through a spring (2664).

10. The COF packaging structure of a narrow-border display screen according to claim 9, characterized in that: The opening of the through hole (265) is surrounded by a circular array of limiting protrusions (2652) for limiting the pressing block (2663), wherein the outer side of the pressing block (2663) is provided with a positioning groove (2665) adapted thereto.

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