Flexible circuit board and display module

Abstract

The utility model relates to a flexible circuit board and a display module, and relates to the field of display technology, the flexible circuit board comprises an FPC body and a reinforcing plate arranged in a plugging finger area of an interface end of the FPC body, the FPC body is in press fit connection with the reinforcing plate, and the edge of a press fit position of the FPC body and the reinforcing plate is arranged in a non-linear shape. According to the flexible circuit board, the edge of the pressing part is designed to be nonlinear, so that stress is more uniformly distributed in the pressing area, the stress is not concentrated in a certain specific area but is uniformly distributed in the whole edge area, the stress concentration phenomenon is avoided, the tearing risk is reduced, and the tearing resistance of the flexible circuit board is improved; moreover, the design of the non-linear pressing edges can increase the contact area between the FPC body and the reinforcing plate, improves the connection stability and mechanical strength between the FPC body and the reinforcing plate, enables the FPC body to distribute loads more uniformly when the FPC body is stressed, reduces the local mechanical fatigue, and improves the structural strength and long-term use reliability of the flexible circuit board.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of display technology, and in particular to a flexible circuit board and a display module. BACKGROUND

[0002] As an indispensable connecting component in electronic devices, flexible circuit boards (FPCs) are widely used in display modules of various consumer electronic products such as mobile phones, tablets, televisions, etc. Due to its flexibility and bendable characteristics, FPC can effectively solve the space and structural requirements that traditional rigid circuit boards cannot meet, and plays an important role in small-sized and high-performance electronic devices. The constituent materials of FPC generally include FCCL (flexible copper foil laminated material) substrate, cover film, reinforcing material, and ink and other auxiliary materials.

[0003] In the design of plug-in type FPC, in order to enhance the plug-in strength at the FPC interface, reinforcing materials are usually designed at the plug-in end to strengthen the strength of the plug-in finger area at the interface end. The reinforcing materials are generally made of materials such as polyimide (PI) or polyethylene terephthalate (PET) that have high mechanical strength. These reinforcing materials are combined with the FPC body and mainly serve to improve interface strength, enhance durability, and avoid damage to the FPC body during plug-in.

[0004] At present, the reinforcing design of plug-in type FPC mostly adopts a rectangular reinforcing structure, which can also be designed into different shapes according to the different shapes of FPC. The side edge of the reinforcing area and the FPC body line are designed as straight lines. Although this design can meet certain strength requirements, there are some problems in the actual production process. In particular, when the FPC is pressed with the reinforcing material, obvious indentations will be generated at the edge of the reinforcing and FPC contact due to incomplete matching of the pressing. The indentations are straight lines. During assembly, when the FPC is subjected to lateral stress, it is easy to cause the FPC body to tear along the reinforcing edge, thereby causing the risk of display module failure and affecting the quality and reliability of electronic devices. UTILITY MODEL CONTENT

[0005] In order to improve the reinforcing design of plug-in type FPC, reduce indentations during pressing, and improve the anti-tearing performance of FPC under stress, the present application provides a flexible circuit board and a display module.

[0006] The flexible circuit board provided by the present application adopts the following technical solution:

[0007] A flexible circuit board and a display module, comprising an FPC body and a reinforcing plate provided at the plug-in finger area of the interface end of the FPC body, the FPC body and the reinforcing plate being press-connected, and the edge of the press-connection between the FPC body and the reinforcing plate being arranged in a non-straight line shape.

[0008] By adopting the technical scheme, the edge of the pressing part is designed as a non-linear shape, so that the stress is more evenly distributed in the pressing area, and the stress is not concentrated in a certain area, but is evenly distributed to the entire edge area, thereby avoiding the generation of local indentation and stress concentration, reducing the risk of tearing, and improving the anti-tearing ability of the flexible circuit board. The non-linear pressing edge design can increase the contact area between the FPC body and the reinforcing plate, improve the connection stability and mechanical strength between the two, so that the FPC body can more evenly distribute the load when stressed, reduce local mechanical fatigue, and thus improve the structural strength and long-term reliability of the entire flexible circuit board.

[0009] In one specific implementation, the edge includes alternating protrusions and recesses.

[0010] By adopting the technical scheme, the alternating protrusions and recesses form an irregular edge shape, which can more effectively disperse external forces during pressing, reduce indentation or deformation caused by stress concentration, and when subjected to external forces during assembly, the protrusions can withstand certain compression or bending load, while the recesses help reduce stress concentration and reduce the occurrence of FPC body tearing, thereby improving the anti-tearing performance of the entire flexible circuit board. And the alternating arrangement of the protrusions and recesses forms a complex contact surface, making the contact between the FPC body and the reinforcing plate more intimate, enhancing the adhesion effect between the FPC and the reinforcing plate, and avoiding connection failure due to uneven stress.

[0011] In one specific implementation, the protrusions and the recesses are both arc-shaped, so that the edge is arranged in a wavy shape.

[0012] By adopting the technical scheme, the arc-shaped protrusions and recesses help to evenly distribute the applied external force during pressing and use, and the wavy edge can effectively avoid the concentration of stress in a certain local area, thereby reducing damage or tearing caused by excessive local stress. By optimizing the stress distribution, the arc-shaped wavy edge can significantly improve the anti-tearing and anti-pressure properties.

[0013] In one specific implementation, the protrusions and the recesses are both triangular, so that the edge is arranged in a zigzag shape.

[0014] By adopting the technical scheme, the alternating arrangement of the plurality of triangular convex parts and concave parts disperses stress through multiple points, the serrated edge can more evenly distribute external force, and stress concentration is avoided; when the flexible circuit board is subjected to external force impact or stretching, the serrated structure can effectively absorb external force by dispersing stress and providing multiple contact points, local rupture or damage of the FPC body is avoided, and the tear resistance of the flexible circuit board is improved.

[0015] In a specific implementable embodiment, the convex part and the concave part are both rectangular or trapezoidal, so that the edge is in a Great Wall shape.

[0016] By adopting the technical scheme, the Great Wall-shaped edge design helps to disperse external force, makes the stress distribution more uniform, reduces stress concentration, and improves the tear resistance; the design of the rectangular or trapezoidal structure helps to improve the connection stability of the edge, increases the contact area between the two, reduces the loosening or instability problem caused by incomplete contact, enhances the shear strength of the structure, and improves the shear and tensile strength in long-term use.

[0017] In a specific implementable embodiment, the height of the convex part and the concave part is between 0.5-1.5mm, and the width of the convex part and the concave part is between 0.5-2.0mm.

[0018] By adopting the height and width design, when subjected to external impact or pressure, the appropriate size can make the stress uniformly distributed, avoid stress concentration, improve the impact resistance of the overall structure, and reduce the risk of local damage or rupture; the moderate height and width design ensures that there is enough contact area between the convex part and the concave part, providing greater friction and stability when contacting or connecting, and enhancing the firmness of the contact point.

[0019] In a specific implementable embodiment, the edge of the FPC body and the reinforcing plate at the pressing part includes spaced convex-concave parts and straight parts.

[0020] By adopting the technical scheme, the design of the spaced convex-concave parts and straight parts, the convex-concave parts can disperse impact force and avoid damage caused by excessive local pressure, the convex-concave parts absorb impact energy and avoid loosening or breaking of the connection part between the FPC body and the reinforcing plate due to impact; the straight part provides stable contact and support under smaller force, thereby ensuring the reliability of the pressing area in various environments, providing better anti-deformation ability and stronger adhesion.

[0021] In a specific implementable embodiment, the ratio of the number of convex-concave parts to the number of straight parts is between 1:1-3:1.

[0022] By adopting the above technical solution, the stress distribution at the joint can be made more uniform by the relatively large number of concave-convex parts. Under the action of load or external force, the concave-convex parts can effectively disperse stress through their curved shapes, reduce stress concentration, improve the tensile and shear resistance of the joint, and provide better impact absorption capacity and buffering effect, thereby improving the impact resistance of the joint. When subjected to instantaneous impact or sudden external force, the large number of concave-convex parts can improve the compression and tear resistance of the entire joint area.

[0023] A display module comprising the flexible circuit board as described above.

[0024] In summary, the beneficial technical effects of the present application are: the present application adopts a non-linear edge design (such as a wave-shaped, zigzag-shaped, Great Wall-shaped structure, etc.), which can effectively distribute the externally applied stress uniformly across the entire connection area. The non-linear design effectively avoids excessive stress concentration in a local area by changing the edge shape, thereby reducing the risk of tearing and improving the tear resistance of the flexible circuit board. These shapes enhance the tear resistance, bending resistance, compression resistance, and impact resistance of the flexible circuit board by providing multiple contact points and the ability to disperse external forces, enabling it to withstand higher mechanical loads and prolong its service life.

[0025] Furthermore, the non-linear press-fit edge design can increase the contact area between the FPC body and the reinforcing plate, making the connection between the two more secure and stable. Not only does this improve the mechanical strength of the connection, but it also makes the load under external force more evenly distributed, reducing the occurrence of local mechanical fatigue and thereby improving the long-term reliability of the overall structure. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram for showing a flexible circuit board with a wave-shaped edge.

[0027] Figure 2 is a structural schematic diagram for showing a flexible circuit board with a zigzag-shaped edge.

[0028] Figure 3 is a structural schematic diagram for showing a flexible circuit board with a Great Wall-shaped edge.

[0029] Figure 4 is a structural schematic diagram for showing a flexible circuit board with concave-convex parts and straight-line parts arranged in intervals.

[0030] REFERENCE SIGNS: 1, FPC body; 2, reinforcing plate; 3, edge; 4, convex part; 5, concave part; 6, concave-convex part; 7, straight-line part. DETAILED DESCRIPTION

[0031] The following will be described in conjunction with the accompanying Figures 1-4Further details of the application are described below.

[0032] Referring to Figure 1 The embodiments of the present application disclose a flexible circuit board, which is not limited to be applied to a display module. The flexible circuit board comprises a FPC body 1 and a reinforcing plate 2 arranged at an interface end of the FPC body 1. The FPC body 1 is made of a flexible material and is used for providing electrical connection and signal transmission. The reinforcing plate 2 is connected to the FPC body 1 by pressing and is used for providing mechanical support, thereby enhancing the stability and reliability of the flexible circuit board under stress.

[0033] In the embodiments, the connection between the FPC body 1 and the reinforcing plate 2 is achieved by pressing, and the edge 3 of the pressing part of the FPC body 1 and the reinforcing plate 2 is arranged in a non-linear shape. The non-linear shape can make the stress more evenly distributed in the pressing area, and the stress will not be concentrated in a certain area, but will be evenly distributed in the whole edge 3 area, thereby avoiding the local indentation and stress concentration phenomenon, reducing the risk of tearing, and improving the anti-tearing ability of the flexible circuit board.

[0034] In addition, the non-linear pressing edge 3 design can increase the contact area between the FPC body 1 and the reinforcing plate 2, improve the connection stability and mechanical strength between the two, and make the FPC body 1 more evenly distribute the load when stressed, reduce local mechanical fatigue, and thus improve the structural strength and long-term reliability of the whole flexible circuit board.

[0035] In some embodiments, the edge 3 of the pressing part of the FPC body 1 and the reinforcing plate 2 comprises alternating protrusions 4 and recesses 5. The protrusions 4 and the recesses 5 form an irregular edge 3 shape, which can more effectively disperse external force when stressed, avoid local stress concentration, the protrusions 4 can withstand certain compression or bending load, and the recesses 5 can help reduce stress concentration and prevent local tearing caused by excessive stress. In addition, this structure design can increase the contact area between the FPC body 1 and the reinforcing plate 2, thereby enhancing the mechanical connection stability between the two, and thus preventing connection failure caused by uneven stress.

[0036] Referring to Figures 1-3 According to specific embodiments, the protrusions 4 and the recesses 5 can have different geometric shapes, including arc, triangle, rectangle or trapezoid, etc. The following are several edge 3 shape design schemes:

[0037] Arc design (wavy edge): in some embodiments (such as Figure 1As shown in FIG. 3, the protruding part 4 and the recessed part 5 are arc-shaped, forming a wavy edge 3; the wavy edge 3 helps to evenly distribute external force during pressing and use, and the wavy edge 3 can effectively avoid the concentration of local stress, thereby improving the tear resistance and pressure resistance of the flexible circuit board.

[0038] Triangular design (jagged edge): in other embodiments (such as Figure 2 As shown in FIG. 4, the protruding part 4 and the recessed part 5 are triangular, forming a jagged edge 3; the jagged edge 3 can disperse stress through multiple points and more evenly distribute external force, and when the flexible circuit board is impacted or stretched by external force, the jagged structure can effectively absorb external force and avoid local rupture or damage, thereby improving the tear resistance.

[0039] Rectangular or trapezoidal design (Great Wall-shaped edge): in other embodiments (such as Figure 3 As shown in FIG. 5, the protruding part 4 and the recessed part 5 are rectangular or trapezoidal, forming a Great Wall-shaped edge 3; the Great Wall-shaped edge 3 helps to disperse external force and make the stress points more evenly distributed, thereby improving the tear resistance; the design of the rectangular or trapezoidal structure helps to improve the connection stability of the edge 3, increases the contact area between the two, reduces the problem of looseness or instability due to incomplete contact, and enhances the shear strength of the structure, thereby improving the shear and tensile strength during long-term use.

[0040] In the present embodiment, the height and width of the protruding part 4 and the recessed part 5 are designed within a certain range, specifically: the height is between 0.5 and 1.5 mm, and the width is between 0.5 and 2.0 mm; within this range of height and width, the structural design of the protruding part 4 and the recessed part 5 can effectively disperse external force, and when subjected to external impact or pressure, the appropriate size can make the stress evenly distributed, avoid stress concentration, improve the impact resistance of the overall structure, and reduce the risk of local damage or rupture; and the moderate height and width design ensures that there is enough contact area between the protruding part 4 and the recessed part 5, which can provide greater friction and stability when in contact or connected, thereby enhancing the firmness of the contact points.

[0041] Referring to Figure 4 In other embodiments, the edge 3 at the pressing position of the FPC body 1 and the reinforcing plate 2 includes spaced apart protrusions and recesses 6 and straight lines 7; the ratio of the number of protrusions and recesses 6 to the number of straight lines 7 is between 1:1 and 3:1;

[0042] Through the design of relatively more number of concave-convex parts 6, the stress distribution at the joint can be made more uniform. Under the action of load or external force, the concave-convex parts 6 can effectively disperse stress through their curved shapes, reduce stress concentration, improve the tensile and shear resistance of the joint, provide better impact absorption capacity and buffering effect, and improve the impact resistance of the joint. When subjected to instantaneous impact or sudden external force, the more concave-convex parts 6 can improve the compression and tear resistance of the entire joint area. The straight line part 7 provides stable contact and support under smaller force, thereby ensuring the reliability of the compression area under various environments, providing better anti-deformation ability and stronger adhesion.

[0043] In the present embodiment, the concave-convex parts 6 include but are not limited to arc-shaped concave-convex parts, triangular concave-convex parts, rectangular concave-convex parts, and trapezoidal concave-convex parts. The present embodiment takes arc-shaped concave-convex parts as an example. The height of the peaks and valleys of the arc-shaped concave-convex parts is between 0.5-1.5mm, and the width of the peaks and valleys of the arc-shaped concave-convex parts is between 0.5-2.0mm. The length of the straight line part 7 is between 1.0-4.0mm.

[0044] By reasonably setting the height and width of the peaks and valleys, the concave-convex parts 6 can disperse impact force, improve the impact resistance of the structure, produce energy absorption effect under external impact, reduce damage to the connecting part by external force, and further improve the tear resistance. The reasonable length design of the straight line part 7 can provide sufficient rigidity, avoid instability caused by too short straight line part 7, or complexity caused by too long straight line part 7, and the appropriate length of the straight line part 7 can balance the strength and flexibility of the structure, enhance the durability and overall stability of the joint.

[0045] The implementation principle of the present embodiment is that the flexible circuit board of the present application optimizes the design of the edge 3 of the compression joint, adopts a non-linear edge 3 design, can uniformly distribute external force on the connecting part of the flexible circuit board, avoid local stress concentration, especially for the flexible circuit board bearing bending or tensile load, adopts a non-linear structure design such as wave shape, zigzag shape, Great Wall shape, etc., which not only improves the stress dispersion effect, but also greatly enhances the tear resistance, bending resistance, compression resistance and impact resistance of the circuit board; thereby improving the reliability and durability of the flexible circuit board in long-term use, reducing the performance degradation and connection failure caused by mechanical fatigue;

[0046] The display module using the flexible circuit board of the present application can significantly improve the tear resistance, connection stability and durability. The optimized design makes the display module more stable under bending, stretching and external impact, prolongs the service life, and at the same time, the enhanced fatigue resistance and compression resistance improve the long-term stability of the display effect, adapt to complex environments and high demand applications, such as foldable display devices or reliability under high temperature and humid conditions, improve the performance and production efficiency of the overall product.

[0047] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A flexible wiring board, characterized by: The flexible printed circuit board comprises a FPC body (1) and a reinforcing plate (2) arranged at the interface end of the FPC body (1), the FPC body (1) is connected with the reinforcing plate (2) by pressing, and the edge (3) of the FPC body (1) and the reinforcing plate (2) is arranged in a non-linear shape.

2. The flexible wiring board according to claim 1, characterized by: The edge (3) comprises alternating convex parts (4) and concave parts (5).

3. The flexible circuit board of claim 2, wherein: The convex parts (4) and the concave parts (5) are both arc-shaped, so that the edge (3) is arranged in a wave shape.

4. The flexible wiring board according to claim 2, characterized by: The convex parts (4) and the concave parts (5) are both triangular, so that the edge (3) is arranged in a zigzag shape.

5. The flexible circuit board of claim 2, wherein: The convex parts (4) and the concave parts (5) are both rectangular or trapezoidal, so that the edge (3) is arranged in a Great Wall shape.

6. The flexible circuit board of claim 2, wherein: The height of the convex parts (4) and the concave parts (5) is between 0.5-1.5mm, and the width of the convex parts (4) and the concave parts (5) is between 0.5-2.0mm.

7. The flexible circuit board of claim 1, wherein: The edge (3) of the FPC body (1) and the reinforcing plate (2) comprises alternating convex-concave parts (6) and straight parts (7).

8. The flexible circuit board of claim 7, wherein: The ratio of the number of convex-concave parts (6) to the number of straight parts (7) is between 1:1-3:

1.

9. A display module, characterized by: The flexible printed circuit board comprises a FPC body (1) and a reinforcing plate (2) arranged at the interface end of the FPC body (1), the FPC body (1) is connected with the reinforcing plate (2) by pressing, and the edge (3) of the FPC body (1) and the reinforcing plate (2) is arranged in a non-linear shape.

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