A flexible printed circuit board and a display device

Abstract

An embodiment of the present application provides a flexible printed circuit board and a display device. The flexible printed circuit board includes a bonding terminal area, and a plurality of terminals are arranged at intervals along a first direction in the bonding terminal area; and an avoidance structure, at least a part of the avoidance structure is arranged on one side in the extending direction of the bonding terminal area; the avoidance structure is configured to be able to form an avoidance space, and the avoidance space is used to avoid a source driving circuit. By using the provided avoidance structure, the number of layers of the flexible printed circuit board can be reduced, the process is simple, and the manufacturing cost is low.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of display technology, and particularly relates to a flexible printed circuit board and a display device. Background Art

[0002] Currently, in order to reduce the cost of a Flexible Multi Layer On Cell (FMLOC), it is necessary to design two-layer flexible printed circuit boards (FPCs). However, in the design structure of two-layer flexible circuit boards, touch signal lines will overlap with high-speed signal lines, etc., resulting in coupling interference, which affects the touch and display performance of the display device. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail in this application. This overview is not intended to limit the scope of protection of the claims.

[0004] Embodiments of this application provide a flexible printed circuit board and a display device.

[0005] Embodiments of this application provide a flexible printed circuit board. The flexible printed circuit board includes: [[ID=(20]]

[0006] A bonding terminal area provided with a plurality of terminals spaced along a first direction; and

[0007] An avoidance structure, at least a part of which is provided on one side in the extending direction of the bonding terminal area; the avoidance structure is configured to be able to form an avoidance space, and the avoidance space is used to avoid a source driving circuit.

[0008] In an exemplary embodiment, the avoidance structure includes a first avoidance groove; the first avoidance groove is provided on one side in the extending direction of the bonding terminal area; the first avoidance groove penetrates the flexible printed circuit board along the thickness direction of the flexible printed circuit board; the groove wall of the first avoidance groove forms the avoidance space.

[0009] In an exemplary embodiment, the avoidance structure includes a bending area, and the bending area is configured to be able to bend relative to the area of the flexible printed circuit board other than the bending area to form the avoidance space;

[0010] Wherein, the bending area is the bonding terminal area; or, the bending area is a partial area of the flexible printed circuit board other than the bonding terminal area.

[0011] In an exemplary embodiment, in a structure where the bent area is a partial area of the flexible printed circuit board other than the bonding terminal area, the avoidance structure further includes a first bent portion and a second bent portion; the first bent portion and the second bent portion are respectively disposed at two ends in the extending direction of the bonding terminal area;

[0012] The bent area is further configured to be bent relative to the bonding terminal area along the first bent portion and the second bent portion to form the avoidance space.

[0013] In an exemplary embodiment, the avoidance structure further includes a second avoidance groove, and the second avoidance groove is located between the first bent portion and the second bent portion; the second avoidance groove penetrates through the flexible printed circuit board along the thickness direction of the flexible printed circuit board;

[0014] The second avoidance groove includes a first groove segment, a second groove segment, and a third groove segment that are sequentially communicated; the second groove segment extends along the first direction; both the first groove segment and the third groove segment extend along the second direction and towards the bonding terminal area;

[0015] Wherein, the plane formed by the first direction and the second direction is parallel to the plane where the flexible printed circuit board is located.

[0016] In an exemplary embodiment, the second avoidance groove forms a first accommodation space, and the opening of the first accommodation space faces the bonding terminal area; at least a part of the bonding terminal area is located in the first accommodation space.

[0017] In an exemplary embodiment, the thickness of the first bent portion is less than the thickness of the bent area; the thickness of the second bent portion is less than the thickness of the bent area.

[0018] In an exemplary embodiment, the avoidance structure further includes a cutting line, and the cutting line is located between the first bent portion and the second bent portion; the cutting line penetrates through the flexible printed circuit board along the thickness direction of the flexible printed circuit board;

[0019] The cutting line includes a first line segment, a second line segment, and a third line segment that are sequentially connected; the second line segment extends along the first direction; both the first line segment and the third line segment extend along the second direction and towards the bonding terminal area;

[0020] Wherein, the plane formed by the first direction and the second direction is parallel to the plane where the flexible printed circuit board is located.

[0021] In an exemplary embodiment, the cutting line forms a second accommodation space, and an opening of the second accommodation space faces the bonding terminal area; at least a part of the bonding terminal area is located in the second accommodation space.

[0022] In an exemplary embodiment, the avoidance structure further includes a first weakening hole and a second weakening hole; the first weakening hole is connected to an end of the first line segment far from the second line segment, and the second weakening hole is connected to an end of the third line segment far from the second line segment.

[0023] In an exemplary embodiment, the bonding terminal area includes a first terminal area, a middle terminal area, and a second terminal area arranged in sequence along the first direction; the flexible printed circuit board further includes:

[0024] A touch driving circuit, which is located on a side of the bonding terminal area far from the avoidance structure, and the touch driving circuit is close to the first terminal area;

[0025] An external connection port, which is located on a side of the touch driving circuit far from the bonding terminal area;

[0026] A first signal line, one end of which is connected to the second terminal area, and the other end of the first signal line bypasses the first terminal area and is connected to the touch driving circuit;

[0027] A second signal line, one end of which is connected to the external connection port, and the other end of the second signal line is connected to the middle terminal area;

[0028] Wherein, a positive projection of the first signal line and the second signal line in a plane where the flexible printed circuit board is located does not overlap.

[0029] In an exemplary embodiment, the flexible printed circuit board further includes a third signal line, one end of which is connected to the first terminal area, and the other end of the third signal line is connected to the touch driving circuit;

[0030] Wherein, a positive projection of the first signal line, the second signal line, and the third signal line in a plane where the flexible printed circuit board is located does not overlap.

[0031] An embodiment of the present application provides a display device. The display device includes a touch panel and the flexible printed circuit board according to any one of the above embodiments; the touch panel includes an effective area and a bonding area located on one side of the effective area, the bonding area includes a bonding pin area, the bonding pin area includes a plurality of pins, and a plurality of terminals in the bonding terminal area of the flexible printed circuit board are correspondingly connected to the plurality of pins in the bonding pin area;

[0032] Among them, the source driving circuit is located in the bonding area.

[0033] In an exemplary embodiment, a plurality of pins in the bonding pin area are arranged along the first direction. Along the first direction, the bonding pin area includes a first pin area, a middle pin area, and a second pin area arranged in sequence; a plurality of terminals in the first terminal area of the bonding terminal area are correspondingly connected to the plurality of pins in the first pin area, a plurality of terminals in the second terminal area of the bonding terminal area are correspondingly connected to the plurality of pins in the second pin area, and a plurality of terminals in the middle terminal area of the bonding terminal area are correspondingly connected to the plurality of pins in the middle pin area.

[0034] In an exemplary embodiment, in the structure where the avoidance structure includes a first avoidance groove, the source driving circuit is embedded in the first avoidance groove and does not extend beyond the first avoidance groove; the orthographic projection of the first avoidance groove on the plane where the flexible printed circuit board is located covers the orthographic projection of the source driving circuit on the plane where the flexible printed circuit board is located.

[0035] In the structure where the avoidance structure includes a bending area, at least part of the bonding area is located in the avoidance space.

[0036] The flexible printed circuit board provided by the embodiments of the present application, by providing an avoidance structure, after the flexible printed circuit board is assembled in place, the avoidance space formed by the avoidance structure can be used to avoid the source driving circuit, reducing the number of layers of the flexible printed circuit board, and the process is simple with a low manufacturing cost.

[0037] Implementing any product or method of the present invention does not necessarily require achieving all the above-mentioned advantages at the same time. Other features and advantages of the present invention will be described in the subsequent embodiments of the specification, and part of them will become obvious from the embodiments of the specification, or will be understood by implementing the present invention. The objectives and other advantages of the embodiments of the present application can be realized and obtained through the structures specifically pointed out in the specification, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solutions of the present invention and do not constitute a limitation to the technical solutions of the present invention. The shapes and sizes of the components in the drawings do not reflect the actual proportions, and the purpose is only to schematically illustrate the content of the present invention.

[0039] Figure 1 It is a schematic structural diagram of a display device;

[0040] Figure 2 is Figure 1 a cross-sectional schematic diagram of a part of the display device;

[0041] Figure 3 Another cross-sectional schematic diagram of a part of the display device; Figure 1

[0042] Figure 4 A top view schematic diagram of the display device according to an embodiment of the present application;

[0043] Figure 5 A structural schematic diagram of the edge area of the touch panel according to an embodiment of the present application;

[0044] Figure 6 A structural schematic diagram of the bonding area of the touch panel according to an embodiment of the present application;

[0045] Figure 7 A structural schematic diagram of the flexible printed circuit board according to an embodiment of the present application;

[0046] Figure 8 A schematic diagram of the assembly process of the flexible printed circuit board and the touch panel according to an embodiment of the present application;

[0047] Figure 9A A schematic diagram of the assembly process of the cover tape and the flexible printed circuit board according to an embodiment of the present application;

[0048] Figure 9B A schematic diagram of the cover tape assembled to the flexible printed circuit board according to an embodiment of the present application;

[0049] Figure 10 A schematic diagram of the assembly of the touch panel and the flexible printed circuit board according to an embodiment of the present application;

[0050] Figure 11 A cross-sectional schematic diagram of the display device according to an embodiment of the present application Figure 1 ;

[0051] Figure 12 A cross-sectional schematic diagram of the display device according to an embodiment of the present application Figure 2 ;

[0052] Figure 13 A structural schematic diagram of the flexible printed circuit board according to another embodiment of the present application;

[0053] Figure 14 A structural schematic diagram of the flexible printed circuit board according to yet another embodiment of the present application;

[0054] Figure 15 A schematic diagram of the assembly process of the flexible printed circuit board and the touch panel according to another embodiment of the present application;

[0055] Figure 16 A schematic diagram after the flexible printed circuit board and the touch panel are assembled in place according to another embodiment of the present application;

[0056] ​Figure 17 The cross-sectional schematic diagram of the display device according to another embodiment of the present application Figure 1 ;

[0057] Figure 18 The cross-sectional schematic diagram of the display device according to another embodiment of the present application Figure 2 。

[0058] Description of reference numerals:

[0059] 100 - Display device, 101 - Bridging flexible circuit board, 102 - Touch signal line, 103 - High-speed signal line, 104 - Main flexible circuit board, 105 - Electromagnetic shielding layer, 106 - First protective layer, 107 - First conductive layer, 108 - Second protective layer, 109 - First solder, 110 - Positioning post, 111 - Second solder, 112 - Third protective layer, 113 - Adhesive layer;

[0060] 200 - Touch area, 210 - First touch unit, 211 - First touch electrode, 212 - First connection part, 220 - Second touch unit, 221 - Second touch electrode, 222 - Second connection part;

[0061] 300 - Edge area, 301 - Inductive lead, 302 - Driving lead;

[0062] 400 - Bonding area, 401 - Fan-out area, 402 - Driving chip area, 403 - Bonding pin area, 404 - Source driving circuit;

[0063] 500 - Flexible printed circuit board, 501 - First circuit area, 502 - Second circuit area, 502a - Bending area, 503 - Third circuit area, 504 - Bonding terminal area, 505 - Touch driving circuit, 506 - Inductive signal line, 507 - Driving signal line, 507a - First straight segment, 507b - Second straight segment, 507c - Third straight segment, 508 - Display signal line, 509 - Connector, 510 - Components, 511 - Connecting wire, 512 - First avoidance groove, 513 - First shielding layer, 514 - First adhesive layer, 515 - Wiring layer, 516 - Substrate, 517 - Bottom plate, 518 - Second adhesive layer, 519 - Second shielding layer, 520 - Second avoidance groove, 520a - First groove segment, 520b - Second groove segment, 520c - Third groove segment, 520d - First accommodation space, 521 - First bending part, 522 - Second bending part, 523 - Cutting line, 523a - First line segment, 523b - Second line segment, 523c - Third line segment, 523d - Second accommodation space, 524 - First weakening hole, 525 - Second weakening hole;

[0064] 600 - Connection layer, 601 - Substrate layer, 700 - Cover tape;

[0065] 801 - First substrate, 802 - Embossed adhesive layer, 803 - Foam layer, 804 - Metal layer, 805 - First adhesive layer, 806 - Second adhesive layer, 807 - Second substrate. Detailed implementation mode

[0066] To make the purpose, technical solutions and advantages of the present disclosure clearer and more understandable, the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The implementation modes can be implemented in multiple different forms. It is easy for those of ordinary skill in the art to understand the fact that the mode and content can be transformed into one or more forms without departing from the gist and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited only to the content described in the following implementation modes. Without conflict, the embodiments in the present disclosure and the features in the embodiments can be combined arbitrarily with each other.

[0067] In the accompanying drawings, sometimes for the sake of clarity, the sizes, thicknesses of layers or regions of one or more constituent elements are exaggerated. Therefore, one mode of the present disclosure is not necessarily limited to this size, and the shapes and sizes of the components in the drawings do not reflect the true proportions. In addition, the drawings schematically show ideal examples, and one mode of the present disclosure is not limited to the shapes or numerical values shown in the drawings.

[0068] The ordinal numbers such as "first", "second", "third", etc. in the present disclosure are set to avoid confusion of constituent elements, rather than to limit the quantity. "Multiple" in the present disclosure includes two and more than two quantities.

[0069] In the present disclosure, for convenience, terms indicating orientation or positional relationships such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are used to describe the positional relationships of the constituent elements with reference to the accompanying drawings, which are only for the convenience of describing this specification and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present disclosure. The positional relationships of the constituent elements are appropriately changed according to the directions describing the constituent elements. Therefore, it is not limited to the terms described in the specification and can be appropriately replaced according to the situation.

[0070] In the present disclosure, unless otherwise clearly specified and limited, the terms "install", "connect", "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate member, or the communication inside two elements. For those of ordinary skill in the art, the meanings of the above terms in the present disclosure can be understood according to the situation.

[0071] In the present disclosure, a transistor refers to an element including at least three terminals: a gate electrode, a drain electrode, and a source electrode. The transistor has a channel region between the drain electrode (drain electrode terminal, drain region, or drain) and the source electrode (source electrode terminal, source region, or source), and current can flow through the drain electrode, the channel region, and the source electrode. In the present disclosure, the channel region refers to the region through which current mainly flows.

[0072] In the present disclosure, the first pole can be the drain electrode and the second pole can be the source electrode, or the first pole can be the source electrode and the second pole can be the drain electrode. In cases where transistors with opposite polarities are used or the direction of current changes during circuit operation, etc., the functions of the "source electrode" and "drain electrode" sometimes swap with each other. Therefore, in the present disclosure, the "source electrode" and the "drain electrode" can swap with each other.

[0073] In the present disclosure, "electrically connected" includes cases where components are connected together through an element having a certain electrical effect. The "element having a certain electrical effect" is not particularly limited as long as it can transfer electrical signals between the components to be connected. Examples of the "element having a certain electrical effect" include not only electrodes and wirings, but also switching elements such as transistors, resistors, inductors, capacitors, and other elements having one or more functions.

[0074] In the present disclosure, "parallel" refers to a state where the angle formed by two straight lines is -10° or more and 10° or less, and thus can include a state where the angle is -5° or more and 5° or less. Additionally, "perpendicular" refers to a state where the angle formed by two straight lines is 80° or more and 100° or less, and thus can include a state where the angle is 85° or more and 95° or less.

[0075] In the present disclosure, "film" and "layer" can swap with each other. For example, sometimes "conductive layer" can be changed to "conductive film". Similarly, sometimes "insulating film" can be changed to "insulating layer".

[0076] "About" in the present disclosure means not strictly defining the boundary and allowing values within the range of process and measurement errors.

[0077] Figure 1 It is a schematic structural diagram of a display device. As Figure 1 shown, the display device 100 of the related art adopts a cross-bridge method, using a bridging flexible circuit board 101 to cross the touch signal line 102 over the high-speed signal line 103 to reduce the mutual interference between the touch signal line 102 and the high-speed signal line 103. The bridging flexible circuit board 101 is connected to the main flexible circuit board 104.

[0078] Figure 2 is Figure 1A cross-sectional schematic diagram of a part of the display device Figure 2 is Figure 1 A cross-sectional schematic diagram identifying the location A. As Figure 2 shown, the bridging flexible circuit board 101 and the main flexible circuit board 104 are connected together using surface mount technology (SMT).

[0079] As Figure 2 shown, the main flexible circuit board 104 may include an electromagnetic shielding layer 105, a first protective layer 106, and a first conductive layer 107 that are sequentially stacked. The first conductive layer 107 may include at least one first pad. The main flexible circuit board 104 may also include a second protective layer 108 disposed on the side of the first conductive layer 107 away from the electromagnetic shielding layer 105.

[0080] As Figure 2 shown, the display device 100 may also include a connection layer disposed between the main flexible circuit board 104 and the bridging flexible circuit board 101. The main flexible circuit board 104 and the bridging flexible circuit board 101 are connected via this connection layer. By way of example, the connection layer may include a first solder 109.

[0081] As Figure 2 shown, the display device 100 may also include positioning posts 110 disposed between the main flexible circuit board 104 and the bridging flexible circuit board 101. One or more positioning posts 110 may be provided. The positioning posts 110 and the first solder 109 can be used to mount the main flexible circuit board 104 and the bridging flexible circuit board 101.

[0082] As Figure 2 shown, the bridging flexible circuit board 101 may be provided with through holes. One end of the positioning post 110 may be connected to the first solder 109, and the other end of the positioning post 110 may pass through the bridging flexible circuit board 101 via the through holes.

[0083] As Figure 2 shown, the display device 100 is also provided with a second solder 111 on the side of the bridging flexible circuit board 101 away from the main flexible circuit board 104. The first solder 109, the positioning posts 110, and the second solder 111 are used to solder the bridging flexible circuit board 101 and the main flexible circuit board 104. The bridging flexible circuit board 101 may include a second conductive layer, and the second conductive layer may include at least one second pad. The first pad and the second pad are connected via the first solder 109, the positioning posts 110, and the second solder 111.

[0084] As Figure 2 shown, the display device 100 is also provided with a third protective layer 112 on the side of the second solder 111 away from the main flexible circuit board 104. The third protective layer 112 may be an adhesive layer or the like.

[0085] Based on the above description, the display device 100 is welded. Since the height of the solder is usually relatively high, generally about 70 micrometers (μm), and the display device 100 includes two layers of solder, namely the first solder 109 and the second solder 111, and a third protective layer 112 is further provided on the side of the second solder 111 away from the main flexible circuit board 104. Thus, the overall thickness of the display device 100 is relatively thick. Usually, the thickness of the electromagnetic shielding layer 105 is about 10 micrometers (μm), the thickness of the first protective layer 106 is about 27.5 micrometers (μm), the thickness of the first conductive layer 107 is about 14 micrometers (μm), the thickness of the bridging flexible circuit board 101 is about 25 micrometers (μm), and the thickness of the third protective layer 112 is about 50 micrometers (μm). Therefore, the maximum thickness of the display device 100 can reach about 340 micrometers (μm). The main body thickness of the display device 100 can reach about 297 micrometers (μm). Thus, a large space needs to be avoided in the area where the display device 100 is located in the overall design of the display device, which affects the compatibility between the display device 100 and other components of the display device.

[0086] Figure 3 For Figure 1 another cross-sectional schematic diagram of a part of the display device, Figure 3 For Figure 1 another cross-sectional schematic diagram of the marked position A. As Figure 3 shown, the bridging flexible circuit board 101 and the main flexible circuit board 104 are connected together by a bonding method. As Figure 3 shown, the main flexible circuit board 104 may include an electromagnetic shielding layer 105, a first protective layer 106, a first conductive layer 107, and a second protective layer 108 that are sequentially stacked.

[0087] The display device 100 further includes an adhesive layer 113 disposed between the bridging flexible circuit board 101 and the main flexible circuit board 104. The adhesive layer 113 may be an anisotropic conductive film (ACF for short). During actual assembly, the anisotropic conductive film may be first attached to one side of the main flexible circuit board 104, and then the bridging flexible circuit board 101 is attached to the main flexible circuit board 104. The bridging flexible circuit board 101 and the main flexible circuit board 104 can be connected together by pressing. The thickness of the adhesive layer 113 is generally about 10 micrometers (μm) to 30 micrometers (μm), and it will become thinner after being pressed. The maximum thickness of the display device 100 connected by the bonding method is about 200 micrometers (μm), and the main body thickness of the display device 100 is about 150 micrometers (μm). The bonding method can reduce the thickness of the bridging position of the two flexible circuit boards, optimize the layout space of the display device, and better accommodate the space of the whole machine. However, the bonding method has a complex process and high cost, and two additional bonding processes are required, resulting in a long operation cycle.

[0088] Therefore, an embodiment of the present application provides a flexible printed circuit board. The flexible printed circuit board includes:

[0089] A bonding terminal area, where a plurality of terminals are arranged at intervals along a first direction; and

[0090] An avoidance structure, at least a part of which is disposed on one side in the extending direction of the bonding terminal area; the avoidance structure is configured to be able to form an avoidance space, and the avoidance space is used to avoid the source driver circuit.

[0091] In the flexible printed circuit board provided by the embodiment of the present application, by setting the avoidance structure, after the flexible printed circuit board is assembled in place, the avoidance space formed by the avoidance structure can be used to avoid the source driver circuit, reducing the number of layers of the flexible printed circuit board, and having a simple process and a low manufacturing cost.

[0092] The technical solution of the embodiment of the present application will be described in detail below through specific embodiments.

[0093] The display device of an exemplary embodiment of the present disclosure may include a display panel disposed on a substrate and a touch panel disposed on the display panel. The display panel may be a liquid crystal display (LCD) panel, or may be an organic light emitting diode (OLED) display panel, or may be a plasma display panel (PDP), or may be an electrophoretic display (EPD) panel. In an exemplary embodiment, the display panel may be an OLED display panel. OLED is an active light-emitting display device, which has the advantages of self-luminescence, wide viewing angle, high contrast, low power consumption, extremely high response speed, etc. With the continuous development of display technology, a flexible display device (FlexibleDisplay) using OLED as the light-emitting device and controlled by thin film transistors (TFTs) has become the mainstream product in the current display field. According to product requirements such as flexible folding and narrow borders, the existing OLED-based touch structure adopts a flexible multi-layer covering surface structure form, where the display structure and the touch structure are all integrated on the substrate, and the touch panel is disposed on the encapsulation layer of the OLED backplane, forming an on-cell structure, which has the advantages of being thin, light, and foldable, and can meet product requirements such as flexible folding and narrow borders.

[0094] Figure 4 It is a top view schematic diagram of the display device according to an embodiment of the present application. As Figure 4 shown, taking the touch panel disposed on the display panel to form an FMLOC structure form as an example. In a plane parallel to the touch panel, the touch panel includes an active area (AA), a bonding area located on one side of the active area, and an edge area located on the other sides of the active area. For the stacked display panel and touch panel, the active area may be either the touch area of the touch panel or the display area of the display panel. The touch area and the display area in the following description both refer to the active area.

[0095] In an exemplary embodiment, the touch area 200 at least includes a plurality of touch electrodes arranged regularly, the edge area 300 at least includes a plurality of touch leads, and the bonding area 400 at least includes pins for connecting the touch leads to an external control device.

[0096] In an exemplary embodiment, the touch panel may have a mutual capacitance structure. The touch area 200 may include a plurality of first touch units 210 and a plurality of second touch units 220. The first touch units 210 have a linear shape extending along a first direction D1, and the plurality of first touch units 210 are arranged in sequence along a second direction D2. The second touch units 220 have a linear shape extending along the second direction D2, and the plurality of second touch units 220 are arranged in sequence along the first direction D1. The first direction D1 intersects with the second direction D2.

[0097] Each first touch unit 210 includes a plurality of first touch electrodes 211 and a first connection portion 212 arranged in sequence along the first direction D1. The first touch electrodes 211 and the first connection portion 212 are alternately arranged and connected in sequence. Each second touch unit 220 includes a plurality of second touch electrodes 221 arranged in sequence along the second direction D2. The plurality of second touch electrodes 221 are spaced apart, and adjacent second touch electrodes 221 are connected to each other through a second connection portion 222.

[0098] In an exemplary embodiment, the film layer where the second connection portion 222 is located is different from the film layers where the first touch electrodes 211 and the second touch electrodes 221 are located. The first touch electrodes 211 and the second touch electrodes 221 are alternately arranged in a third direction D3, and the third direction D3 intersects with the first direction D1 and the second direction D2.

[0099] In an exemplary embodiment, the plurality of first touch electrodes 211, the plurality of second touch electrodes 221, and the plurality of first connection portions 212 may be disposed on the same layer in the touch layer and may be formed through the same patterning process. The first touch electrodes 211 and the first connection portions 212 may be an integrally connected structure. The second connection portion 222 may be disposed in the bridging layer, and adjacent second touch electrodes 221 are connected to each other through vias. An insulating layer is disposed between the touch layer and the bridging layer.

[0100] In an exemplary embodiment, the plurality of first touch electrodes 211, the plurality of second touch electrodes 221, and the plurality of second connection portions 222 may be disposed on the same layer in the touch layer. The second touch electrodes 221 and the second connection portions 222 may be an integrally connected structure. The first connection portion 212 may be disposed in the bridging layer, and adjacent first touch electrodes 211 are connected to each other through vias.

[0101] In an exemplary embodiment, the first touch electrodes 211 may be driving (Tx) electrodes, and the second touch electrodes 221 may be sensing (Rx) electrodes. Alternatively, the first touch electrodes 211 may be sensing (Rx) electrodes, and the second touch electrodes 221 may be driving (Tx) electrodes.

[0102] In an exemplary embodiment, the first touch electrode 211 and the second touch electrode 221 may have a rhombus shape, for example, a regular rhombus, or a horizontally elongated rhombus, or a vertically elongated rhombus. In some possible implementation manners, the first touch electrode 211 and the second touch electrode 221 may have any one or more of a triangle, a square, a trapezoid, a parallelogram, a pentagon, a hexagon, and other polygons, which are not limited in the present disclosure.

[0103] In an exemplary embodiment, the first touch electrode 211 and the second touch electrode 221 may be in the form of a transparent conductive electrode. In another exemplary embodiment, the first touch electrode 211 and the second touch electrode 221 may be in the form of a metal mesh, which is formed by interweaving multiple metal lines. The metal mesh includes a plurality of mesh patterns, and the mesh pattern is a polygon formed by multiple metal lines. The first touch electrode 211 and the second touch electrode 221 in the form of a metal mesh have advantages such as low resistance, small thickness, and fast response speed.

[0104] Figure 5 It is a schematic structural diagram of the edge area of the touch panel according to an embodiment of the present application. As Figure 5 shown, except for the side where the bonding area 400 is located, the edge area 300 is located on other sides of the touch area 200. By way of example, the first touch electrode 211 is a sensing (Rx) electrode, and the second touch electrode 221 is a driving (Tx) electrode.

[0105] In an exemplary embodiment, a plurality of sensing (Rx) leads 301 and a plurality of driving (Tx) leads 302 are provided in the edge area 300. The first end of the driving lead 302 is connected to the driving electrode, and the second end of the driving lead 302 extends to one side of the bonding area 400. The first end of the sensing lead 301 is connected to the sensing electrode, and the second end of the sensing lead 301 extends along the edge area 300 to the other side of the bonding area 400. By way of example, the sensing lead 301 and the driving lead 302 together form a touch lead.

[0106] In an exemplary embodiment, the first end of the driving lead 302 is connected to the driving electrode, and the second end of the driving lead 302 extends to one side of the bonding area 400. The first end of the sensing lead 301 is connected to the sensing electrode, and the second end of the sensing lead 301 extends along the edge area 300 to one side of the bonding area 400.

[0107] Figure 6 It is a schematic structural diagram of the bonding area of the touch panel according to an embodiment of the present application. As Figure 6 shown, the bonding area 400 is located on one side of the touch area 200. Along the direction away from the touch area 200 (second direction D2), the bonding area 400 may include a fan-out area 401, a driving chip area 402, and a bonding pin area 403 arranged in sequence.

[0108] The fan-out region 401 can be configured to set signal transmission lines of the display panel and touch leads of the touch panel. The signal transmission lines of the display panel at least include a first power supply line (VDD), a second power supply line (VSS), and multiple data transmission lines. The multiple data transmission lines are configured to connect data lines of the display panel in a fan-out routing manner. The first power supply line VDD and the second power supply line VSS are configured to connect to the high-level power supply line and the low-level power supply line of the display panel, respectively. The multiple touch leads of the touch panel are configured to be correspondingly connected to multiple pins of the bonding pad region 403.

[0109] The driver chip region 402 can be configured to set a source driver circuit (Driver IC) 404. The source driver circuit 404 is configured to be connected to the multiple data transmission lines of the fan-out region 401. The bonding pad region 403 can be configured to set multiple pins (PINs). The multiple pins, the multiple touch leads, and multiple display signal lines of the source driver circuit 404 can be correspondingly connected. The bonding pad region 403 is configured to be bonded and connected to a flexible printed circuit board (Flexible Printed Circuit board, abbreviated as FPC) 500 (as Figure 10 , Figure 16 shown).

[0110] In an exemplary embodiment, along a direction (the first direction D1) parallel to the edge of the bonding region 400, the bonding region 400 can be divided into a first side region, a middle region, and a second side region. The edge of the bonding region is the edge of the bonding region 400 adjacent to the touch region 200. In the following description, the left side of the bonding region refers to the first side region of the bonding region 400, the right side of the bonding region refers to the second side region of the bonding region 400, and the middle of the bonding region refers to the middle region between the left side and the right side of the bonding region.

[0111] In an exemplary embodiment, the bonding pad region 403 in the bonding region 400 can include a first pin region located in the first side region, a middle pin region located in the middle region, and a second pin region located in the second side region. The first pin region, the middle pin region, and the second pin region all include multiple pins.

[0112] In an exemplary embodiment, as Figure 6 shown, multiple sensing leads 301 are introduced from the touch region 200 to the left side of the bonding region, extend to the first pin region on the left side of the bonding region, and are correspondingly connected to multiple pins of the first pin region. Multiple driving leads 302 are introduced from the touch region 200 to the right side of the bonding region, extend to the second pin region on the right side of the bonding region, and are correspondingly connected to multiple pins of the second pin region.

[0113] Figure 7Schematic diagram of the flexible printed circuit board structure according to an embodiment of the present application. As Figure 7 shown, the flexible printed circuit board 500 may include a bonding terminal area 504, a first circuit area 501, a second circuit area 502, and a third circuit area 503. As Figure 7 shown, the first circuit area 501 and the bonding terminal area 504 may be rectangular. The second circuit area 502 and the third circuit area 503 may be irregular shapes, etc. The first circuit area 501 may be located between the second circuit area 502 and the bonding terminal area 504. The plane where the flexible printed circuit board 500 is located is parallel to the plane formed by the first direction D1 and the second direction D2.

[0114] In an exemplary embodiment, the bonding terminal area 504 may include a plurality of terminals, and the plurality of terminals are correspondingly connected to the plurality of pins of the bonding pin area 403.

[0115] In an exemplary embodiment, the plurality of terminals in the bonding terminal area 504 are regularly arranged along the first direction D1. The bonding terminal area 504 may include a first terminal area, a middle terminal area, and a second terminal area. The position of the first terminal area corresponds to the position of the first pin area of the bonding area, and the plurality of terminals of the first terminal area are correspondingly connected to the plurality of pins of the first pin area. The position of the middle terminal area corresponds to the position of the middle pin area of the bonding area, and the plurality of terminals of the middle terminal area are correspondingly connected to the plurality of pins of the middle area. The position of the second terminal area corresponds to the position of the second pin area of the bonding area, and the plurality of terminals of the second terminal area are correspondingly connected to the plurality of pins of the second pin area.

[0116] In an exemplary embodiment, the second circuit area 502 may at least include a touch driving circuit (Touch IC) 505, and the touch driving circuit 505 is configured to be connected to a plurality of driving signal lines and a plurality of sensing signal lines on the flexible printed circuit board 500.

[0117] In an exemplary embodiment, as Figure 7 shown, along the second direction D2, the touch driving circuit 505 is disposed opposite to the first terminal area. A plurality of sensing signal lines (third signal lines) 506 are only disposed in the first circuit area 501. The first ends of the plurality of sensing signal lines 506 are correspondingly connected to the plurality of terminals of the first terminal area, and are correspondingly connected to a plurality of sensing leads 301 on the left side of the bonding area through the plurality of terminals of the first terminal area and the plurality of pins of the first pin area. The second ends of the plurality of sensing signal lines 506 extend to the touch driving circuit 505 and are connected to the touch driving circuit 505 located in the second circuit area 502, thereby realizing the connection between the touch driving circuit 505 and the plurality of sensing leads 301 of the bonding area, and enabling the touch driving circuit 505 to provide touch sensing signals to the plurality of sensing leads 301.

[0118] In an exemplary embodiment, asFigure 7 As shown, the second circuit region 502 has an irregular shape. The second circuit region 502 at least surrounds the first terminal region. The driving signal lines 507 (first signal lines) are disposed in the second circuit region 502. The first ends of the plurality of driving signal lines 507 are correspondingly connected to the plurality of terminals of the second terminal region, and are correspondingly connected to the plurality of driving leads 302 in the bonding region through the plurality of terminals of the second terminal region and the plurality of pins of the second pin region. The second ends of the plurality of driving signal lines 507 extend in the direction of the first terminal region along the first direction D1. After bypassing the end of the first terminal region provided with the bonding terminal region 504 and the end of the first circuit region 501, they are connected to the touch driving circuit 505. Thus, the touch driving circuit 505 is connected to the plurality of driving leads 302 in the bonding region, and the touch driving circuit 505 provides touch sensing signals to the plurality of driving leads 302. Since the plurality of driving signal lines 507 bypass the end of the first terminal region provided with the bonding terminal region 504, the plurality of driving signal lines 507 and the plurality of sensing signal lines 506 do not overlap in the first circuit region 501 and the second circuit region 502.

[0119] In an exemplary embodiment, the flexible printed circuit board 500 may include an avoidance structure. The avoidance structure is configured to be able to form an avoidance space for avoiding the source driving circuit 404. The avoidance structure may include a first avoidance groove 512. The first avoidance groove 512 may be disposed in the second circuit region 502, and the first avoidance groove 512 is disposed on one side in the extending direction of the bonding terminal region 504. The groove wall of the first avoidance groove 512 may form an avoidance space. As Figure 7 shown, the first avoidance groove 512 may be a through hole, and the shape of the through hole may be square or rectangular or oval, etc. The first avoidance groove 512 is configured to avoid the source driving circuit 404.

[0120] In an exemplary embodiment, as Figure 7 shown, the first ends of the plurality of driving signal lines 507 are correspondingly connected to the plurality of terminals of the second terminal region, and are correspondingly connected to the plurality of driving leads 302 in the bonding region through the plurality of terminals of the second terminal region and the plurality of pins of the second pin region. The second ends of the plurality of driving signal lines 507 extend in the direction of the first terminal region along the first direction D1. After bypassing the first avoidance groove 512, the end of the first terminal region provided with the bonding terminal region 504, and the end of the first circuit region 501, they are connected to the touch driving circuit 505. The plurality of driving signal lines 507 and the first avoidance groove 512 do not overlap in the second circuit region 502. As Figure 7 shown, along the second direction D2, the first avoidance groove 512, the bonding terminal region 504, and the first circuit region 501 are arranged in sequence.

[0121] In an exemplary embodiment, as Figure 7As shown, the driving signal line 507 may include a first straight segment 507a, a second straight segment 507b, and a third straight segment 507c connected in sequence. The first straight segment 507a is closer to the second terminal region than the third straight segment 507c. The third straight segment 507c is closer to the touch driving circuit 505 than the first straight segment 507a.

[0122] The first end of the driving signal line 507 may be disposed on the first straight segment 507a. The first straight segment 507a extends along the second direction D2. The second straight segment 507b extends along the first direction D1. The third straight segment 507c extends along the second direction D2. The third straight segment 507c is disposed opposite to the first straight segment 507a, and the first straight segment 507a and the third straight segment 507c are respectively disposed at two ends of the extending direction of the second straight segment 507b. The second end of the driving signal line 507 may be disposed on the third straight segment 507c.

[0123] In an exemplary embodiment, as Figure 7 shown, the driving signal line 507 may further include a plurality of broken line segments. A broken line segment may connect two adjacent straight line segments.

[0124] In an exemplary embodiment, the third circuit region 503 may at least include an external connection port for connecting to an external signal. The external connection port may include a connector 509 configured to connect to a plurality of display signal lines on the flexible printed circuit board 500.

[0125] In an exemplary embodiment, the connector 509 may employ a board-to-board (BTB) connector.

[0126] In an exemplary embodiment, a plurality of display signal lines 508 (second signal lines) are disposed in the first circuit region 501, the second circuit region 502, and the third circuit region 503. The first ends of the plurality of display signal lines 508 are correspondingly connected to a plurality of terminals in the middle terminal region, and are correspondingly connected to a plurality of display leads in the bonding region through the plurality of terminals in the middle terminal region and the plurality of pins in the middle pin region. The second ends of the plurality of display signal lines 508 sequentially pass through the first circuit region 501 and the second circuit region 502 to reach the third circuit region 503, and are connected to the connector 509 located in the third circuit region 503, thereby realizing the connection between the connector 509 and the plurality of display leads in the bonding region, and enabling an external control device to provide a display signal to the plurality of display leads through the connector 509.

[0127] In an exemplary embodiment, the third circuit region 503 may include components 510. By way of example, the components 510 may be an encoding chip.

[0128] In an exemplary embodiment, a plurality of connection lines 511 are disposed in the third circuit region. The first end of the connection line 511 is correspondingly connected to the touch driving circuit 505, and the second end of the connection line 511 is correspondingly connected to the connector 509.

[0129] Figure 8 This is a schematic diagram of the assembly process of the flexible printed circuit board and the touch panel according to the embodiment of the present application. As Figure 8 shown, the display device may further include a connection layer 600. The flexible printed circuit board 500 is adhesively connected to the touch panel via the connection layer 600. The connection layer 600 may be in a shape such as a loop, and the hollow part of the connection layer 600 is used to avoid the source driving circuit 404. For example, the connection layer 600 may be in a circular ring shape or an elliptical ring shape, etc. The shape of the connection layer 600 may be designed with reference to the shape of the first avoidance groove 512. The present disclosure does not limit the shape of the connection layer 600.

[0130] In an exemplary embodiment, as Figure 8 shown, the connection layer 600 may include a base material layer 601 and a first adhesive layer and a second adhesive layer respectively disposed on opposite sides of the base material layer 601. The two base material layers 601 may be combined into a loop shape.

[0131] In an exemplary embodiment, the material of the base material layer 601 may include a foam material. For example, the foam material includes foam plastic or foam rubber, etc.

[0132] Figure 9A This is a schematic diagram of the assembly process of the cover tape and the flexible printed circuit board according to the embodiment of the present application. As Figure 9A shown, the display device may further include a cover tape 700. The cover tape 700 may be disposed on a side of the flexible printed circuit board 500 away from the connection layer 600, that is, the flexible printed circuit board 500 is located between the cover tape 700 and the connection layer 600. The orthographic projection of the cover tape 700 on the flexible printed circuit board 500 covers the orthographic projection of the first avoidance groove 512 on the flexible printed circuit board 500. The cover tape 700 is connected to the first avoidance groove 512 to form a shielding structure, which can improve the anti-interference performance of the flexible printed circuit board 500.

[0133] In an exemplary embodiment, the cover tape 700 may be a polyester tape (Polyethylene terephthalate Tape, abbreviated as PET Tape), etc.

[0134] Figure 9B This is a schematic diagram of the cover tape assembled to the flexible printed circuit board according to the embodiment of the present application. As Figure 9B shown, the cover tape 700 may cover a part of the bonding terminal region 504.

[0135] Figure 10Schematic diagram of the assembly of the touch panel and the flexible printed circuit board according to the embodiment of the present application. As Figure 10 shown, the bonding pin area 403 of the touch panel is bonded to the bonding terminal area 504 of the flexible printed circuit board 500. As Figure 10 shown, the positive projection of the sensing signal line 506 on the plane where the flexible printed circuit board 500 is located does not overlap with the positive projection of the driving signal line 507 on the plane where the flexible printed circuit board 500 is located. The positive projection of the sensing signal line 506 on the plane where the flexible printed circuit board 500 is located does not overlap with the positive projection of the display signal line 508 on the plane where the flexible printed circuit board 500 is located. The positive projection of the driving signal line 507 on the plane where the flexible printed circuit board 500 is located does not overlap with the positive projection of the display signal line 508 on the plane where the flexible printed circuit board 500 is located. The sensing signal line 506, the driving signal line 507, and the display signal line 508 do not overlap, which can avoid electromagnetic interference between the signal lines and improve the display performance.

[0136] Figure 11 Cross-sectional schematic diagram of the display device according to the embodiment of the present application Figure 1 is Figure 10 the cross-sectional schematic diagram at the marked B. As Figure 11 shown, the source driving circuit 404 can be located inside the first avoidance groove 512. The opening size of the first avoidance groove 512 can be larger than the size of the source driving circuit 404, which is beneficial to the heat dissipation of the source driving circuit 404 and can improve the service life of the display device. The positive projection of the first avoidance groove 512 on the plane where the flexible printed circuit board 500 is located can cover the positive projection of the source driving circuit 404 on the plane where the flexible printed circuit board 500 is located.

[0137] Along the thickness direction of the display device, the positive projection of the source driving circuit 404 can be located in the middle of the positive projection of the first avoidance groove 512. The surface of the source driving circuit 404 away from the touch panel does not exceed the surface of the flexible printed circuit board 500 away from the touch panel, which is beneficial to the heat dissipation of the source driving circuit 404 and can protect the source driving circuit 404. The process is simple and the cost is low, and the service life of the display device can be improved.

[0138] Figure 12 Cross-sectional schematic diagram of the display device according to the embodiment of the present application Figure 2 is Figure 10 the cross-sectional schematic diagram at the marked C. As Figure 12 shown, the flexible printed circuit board 500 can include a bottom plate 517 and a substrate 516 provided on one side of the bottom plate 517. The substrate 516 can be a flexible substrate or the like.

[0139] The flexible printed circuit board 500 can further include a wiring layer 515 provided on the side of the substrate 516 away from the bottom plate 517, and a first adhesive layer 514 located on the side of the wiring layer 515 away from the substrate 516.

[0140] The flexible printed circuit board 500 may further include a first shielding layer 513 on a side of the first adhesive layer 514 away from the substrate 516, a second adhesive layer 518 on a side of the bottom plate 517 away from the substrate 516, and a second shielding layer 519 on a side of the second adhesive layer 518 away from the bottom plate 517. As Figure 12 shown, along the thickness direction, the first shielding layer 513, the first adhesive layer 514, the wiring layer 515, the substrate 516, the bottom plate 517, the second adhesive layer 518, and the second shielding layer 519 may be sequentially stacked. The second shielding layer 519 is connected to the connection layer 600.

[0141] The sensing signal line 506 and the driving signal line 507 may both be arranged on the wiring layer 515. By partitioning and laying out the flexible printed circuit board 500, the driving signal line 507 is arranged in a winding form, so that the touch signal lines (the sensing signal line 506 and the driving signal line 507) avoid the display signal lines, effectively preventing the touch signal lines from crossing the display signal lines. This not only effectively avoids interference between the display signal lines and the touch signal lines, ensures the working reliability, and increases the performance stability, but also the flexible printed circuit board can be realized by using a single-layer board structure or a two-layer board structure, avoiding the use of a multi-layer board structure or a two-layer board + bridge structure. On the one hand, it releases the thickness space of the flexible printed circuit board, effectively reduces the thickness of the flexible printed circuit board, which is beneficial to the thinning of the display device. On the other hand, it reduces the cost of the flexible printed circuit board, simplifies the difficulty of the bonding process, reduces the risk of defects, and improves the product yield.

[0142] In an exemplary embodiment, the first shielding layer 513 may be set to include at least one of the following film layers: a polyester fiber conductive woven fabric layer, a conductive adhesive layer, an alloy amorphous foil layer, an adhesive layer, and a rubber wave-absorbing layer, etc. The polyester fiber conductive woven fabric layer may be a polyester fiber woven fabric with copper or nickel metal plated on the surface, etc. The conductive adhesive layer may be any one of an acrylic adhesive layer, a polyurethane adhesive layer, an acrylic acid adhesive layer, and an epoxy resin adhesive layer added with conductive fillers. The conductive fillers may be any one of nickel powder, silver powder, copper powder, aluminum powder, etc.

[0143] Figure 13 Schematic diagram of the flexible printed circuit board structure according to another embodiment of the present application. As Figure 13As shown, the avoidance structure may include a second avoidance groove 520. The second avoidance groove 520 may be provided in the second circuit area 502 of the flexible printed circuit board 500. A part of the second circuit area 502 is configured to be bendable relative to the binding terminal area 504 at the second avoidance groove 520 to form an avoidance space. The part of the second circuit area 502 that can be bent relative to the binding terminal area 504 at the second avoidance groove 520 is denoted as the bending area 502a. Alternatively, the binding terminal area 504 is configured to be bendable to form an avoidance space. That is, the binding terminal area 504 can be used as the bending area 502a.

[0144] As Figure 13 shown, along the second direction D2, the touch driving circuit 505 is disposed opposite to the first terminal area. A plurality of sensing signal lines 506 are only provided in the first circuit area 501. The first ends of the plurality of sensing signal lines 506 are correspondingly connected to the plurality of terminals of the first terminal area, and are correspondingly connected to the plurality of sensing leads 301 on the left side of the binding area through the plurality of terminals of the first terminal area and the plurality of pins of the first pin area. The second ends of the plurality of sensing signal lines 506 extend to the touch driving circuit 505 and are connected to the touch driving circuit 505 located in the second circuit area 502, thereby realizing the connection between the touch driving circuit 505 and the plurality of sensing leads 301 in the binding area, and enabling the touch driving circuit 505 to provide touch sensing signals to the plurality of sensing leads 301.

[0145] As Figure 13 shown, the first ends of the plurality of driving signal lines 507 are correspondingly connected to the plurality of terminals of the second terminal area, and are correspondingly connected to the plurality of driving leads 302 in the binding area through the plurality of terminals of the second terminal area and the plurality of pins of the second pin area. The second ends of the plurality of driving signal lines 507 extend into the first circuit area 501 along the second direction D2, and then extend into the second circuit area 502 along the first direction D1 after passing through the first circuit area 501, and are connected to the touch driving circuit 505 after bypassing the second avoidance groove 520, the end of the binding terminal area 504 where the first terminal area is provided, and the end of the first circuit area 501. The plurality of driving signal lines 507 do not overlap with the second avoidance groove 520 in the second circuit area 502. As Figure 13 shown, along the second direction D2, the second avoidance groove 520, the binding terminal area 504, and the first circuit area 501 are arranged in sequence.

[0146] As Figure 13As shown, multiple display signal lines 508 are disposed in the first circuit region 501, the second circuit region 502, and the third circuit region 503. The first ends of the multiple display signal lines 508 are correspondingly connected to multiple terminals in the middle terminal region, and are correspondingly connected to multiple display leads in the bonding region through the multiple terminals in the middle terminal region and the multiple pins in the middle pin region. The second ends of the multiple display signal lines 508 sequentially pass through the first circuit region 501 and the second circuit region 502 to reach the third circuit region 503, and are connected to a connector 509 located in the third circuit region 503, thereby realizing the connection between the connector 509 and the multiple display leads in the bonding region, and enabling an external control device to provide a display signal to the multiple display leads through the connector 509. For other structures of the sensing signal line 506, the driving signal line 507, and the display signal line 508, reference can be made to the foregoing, and details will not be elaborated herein.

[0147] In an exemplary embodiment, as Figure 13 shown, the second avoidance groove 520 may include a first groove segment 520a, a second groove segment 520b, and a third groove segment 520c that are sequentially connected. The second groove segment 520b extends along the first direction D1. The first groove segment 520a and the third groove segment 520c are respectively disposed at two ends of the extending direction of the second groove segment 520b. The first groove segment 520a and the third groove segment 520c both extend along the second direction D2. The first groove segment 520a and the third groove segment 520c are both located on the same side of the extending direction of the second groove segment 520b. The first groove segment 520a and the third groove segment 520c may be located between the second groove segment 520b and the bonding terminal region 504. Alternatively, the interval along the second direction D2 between the first groove segment 520a and the bonding terminal region 504 is zero. The interval along the second direction D2 between the third groove segment 520c and the bonding terminal region 504 is zero.

[0148] In an exemplary embodiment, as Figure 13 shown, the second avoidance groove 520 may form a U-shaped first accommodation space 520d, and the opening of the first accommodation space 520d faces the bonding terminal region 504. At least a part of the bonding terminal region 504 may be located within the first accommodation space 520d. For example, all of the bonding terminal region 504 may be located within the first accommodation space 520d.

[0149] In an exemplary embodiment, as Figure 13 shown, the first groove segment 520a and the third groove segment 520c may be designed to have the same shape. For example, the first groove segment 520a may be a rectangular groove.

[0150] In an exemplary embodiment, as Figure 13 shown, the groove width of the first groove segment 520a is equal to the groove width of the third groove segment 520c, and the groove width of the second groove segment 520b is greater than the groove width of the first groove segment 520a.

[0151] In an exemplary embodiment, as Figure 13 shown, the avoidance structure further includes a first bending portion 521 and a second bending portion 522. The first bending portion 521 and the second bending portion 522 can be disposed in the second circuit region 502. The first bending portion 521 and the second bending portion 522 can be respectively disposed at two ends of the second avoidance groove 520 along the first direction D1. The first bending portion 521, the second avoidance groove 520, and the second bending portion 522 can be linearly arranged. The bending region 502a can be bent relative to the binding terminal region 504 from the straight line formed by the first bending portion 521, the second avoidance groove 520, and the second bending portion 522 to form an avoidance space.

[0152] In an exemplary embodiment, the thickness of the first bending portion 521 is less than the thickness of the region of the second circuit region 502 other than the first bending portion 521 and the second bending portion 522. The thickness of the second bending portion 522 is less than the thickness of the region of the second circuit region 502 other than the first bending portion 521 and the second bending portion 522. The thickness of the first bending portion 521 can be the same as the thickness of the second bending portion 522. By thinning the first bending portion 521 and the second bending portion 522, the flexibility of the first bending portion 521 and the second bending portion 522 can be improved, the bending operation force can be reduced, the bending operation can be facilitated, and the operation performance can be improved.

[0153] In an exemplary embodiment, the thickness of the first bending portion 521 is less than the thickness of the bending region 502a. The thickness of the second bending portion 522 is less than the thickness of the bending region 502a.

[0154] In an exemplary embodiment, the projection of the first bending portion 521 in the plane of the flexible printed circuit board 500 can be a rectangle, etc. The plane of the flexible printed circuit board 500 is parallel to the plane formed by the first direction D1 and the second direction D2.

[0155] In an exemplary embodiment, the first bending portion 521 and the second bending portion 522 can be processed into a grid to improve the flexibility of the first bending portion 521 and the second bending portion 522 and reduce the bending operation force.

[0156] In an exemplary embodiment, along the first direction D1, the first bending portion 521 is provided with a plurality of first through holes arranged at intervals. The first through holes penetrate through the flexible printed circuit board 500 along the thickness direction of the flexible printed circuit board 500. For example, the plurality of first through holes can be arranged at equal intervals in sequence, etc.

[0157] In an exemplary embodiment, along the first direction D1, the second bending portion 522 is provided with a plurality of second through holes arranged at intervals. The second through holes penetrate through the flexible printed circuit board 500 along the thickness direction of the flexible printed circuit board 500. For example, the plurality of second through holes can be arranged at equal intervals in sequence, etc. The first through holes and the second through holes can be the same or different.

[0158] In an exemplary embodiment, the first through hole may be one of a kidney-shaped hole, a circular hole, an oval hole, a square hole, a trapezoidal hole, etc.

[0159] In an exemplary embodiment, the plurality of first through holes may be a combination of through holes with different apertures. Alternatively, the plurality of first through holes may be a combination of through holes with different shapes, etc.

[0160] Figure 14 This is a schematic diagram of the flexible printed circuit board structure according to another embodiment of the present application. As Figure 14 shown, the avoidance structure further includes a cutting line 523. The cutting line 523 may be provided in the second circuit region 502. A part of the second circuit region 502 is configured to be bendable relative to the bonding terminal region 504 at the cutting line 523 to form an avoidance space. The part of the second circuit region 502 that can be bent relative to the bonding terminal region 504 at the cutting line 523 is denoted as the bending region 502a. The arrangement of the plurality of sensing signal lines 506, the plurality of driving signal lines 507, and the plurality of display signal lines 508 may refer to the foregoing and will not be elaborated herein.

[0161] In an exemplary embodiment, as Figure 14 shown, the cutting line 523 may include a first line segment 523a, a second line segment 523b, and a third line segment 523c connected in sequence. The second line segment 523b extends along the first direction D1. The first line segment 523a and the third line segment 523c are respectively provided at both ends of the extending direction of the second line segment 523b. The first line segment 523a and the third line segment 523c both extend along the second direction D2. The first line segment 523a and the third line segment 523c are both located on the same side of the extending direction of the second line segment 523b. The first line segment 523a and the third line segment 523c may be located between the second line segment 523b and the bonding terminal region 504. Alternatively, the interval along the second direction D2 between the first line segment 523a and the bonding terminal region 504 is zero. The interval along the second direction D2 between the third line segment 523c and the bonding terminal region 504 is zero.

[0162] In an exemplary embodiment, as Figure 14 shown, the cutting line 523 may form a U-shaped second accommodation space 523d, and the opening of the second accommodation space 523d faces the bonding terminal region 504. At least a part of the bonding terminal region 504 may be located within the second accommodation space 523d. Exemplarily, all of the bonding terminal region 504 may be located within the second accommodation space 523d.

[0163] In an exemplary embodiment, as Figure 14As shown, the first line segment 523a and the third line segment 523c can be designed to have the same shape. For example, the first line segment 523a can be a straight line (parallel to the second direction D2), or an oblique straight line (not parallel to the second direction D2), etc.

[0164] In an exemplary embodiment, as Figure 14 shown, the length of the first line segment 523a is equal to the length of the third line segment 523c, and the length of the second line segment 523b is greater than the length of the first line segment 523a.

[0165] In an exemplary embodiment, as Figure 14 shown, the second circuit region 502 is further provided with a first bending portion 521 and a second bending portion 522. The first bending portion 521 and the second bending portion 522 can be respectively arranged at both ends of the cutting line 523 along the first direction D1. The first bending portion 521, the cutting line 523, and the second bending portion 522 can be linearly arranged. The bending region 502a can be bent relative to the bonding terminal region 504 from the straight line formed by the first bending portion 521, the cutting line 523, and the second bending portion 522 to form an avoidance space.

[0166] In an exemplary embodiment, as Figure 14 shown, the second circuit region 502 may further include a first weakening hole 524 and a second weakening hole 525. The first weakening hole 524 and the second weakening hole 525 are respectively arranged at both ends of the cutting line 523 and are both connected to the cutting line 523.

[0167] In an exemplary embodiment, the first weakening hole 524 can be one of a waist-shaped hole, a circular hole, an oval hole, a square hole, or a trapezoidal hole, etc.

[0168] In an exemplary embodiment, the second weakening hole 525 can be one of a waist-shaped hole, a circular hole, an oval hole, a square hole, or a trapezoidal hole, etc.

[0169] Figure 15 This is a schematic diagram of the assembly process of a flexible printed circuit board and a touch panel in another embodiment of the present application. The bending region 502a can be bent toward the side of the touch panel. For example, the bending region 502a can be bent upward relative to the touch panel, or the bending region 502a can be bent downward relative to the touch panel.

[0170] In an exemplary embodiment, as Figure 15 shown, the bonding pin region 403 in the bonding region 400 can include a first pin region located in the first side region, a middle pin region located in the middle region, and a second pin region located in the second side region. The first pin region, the middle pin region, and the second pin region all include a plurality of pins.

[0171] In an exemplary embodiment, as Figure 15As shown, multiple sensing leads 301 are introduced from the touch area 200 to the left side of the bonding area, extend to the first pin area on the left side of the bonding area, and are correspondingly connected to multiple pins in the first pin area. Multiple driving leads 302 are introduced from the touch area 200 to the right side of the bonding area, extend to the second pin area on the right side of the bonding area, and are correspondingly connected to multiple pins in the second pin area.

[0172] Figure 16 This is a schematic diagram after the flexible printed circuit board and the touch panel in another embodiment of the present application are assembled in place. As Figure 16 shown, the bending area 502a can be bent towards the side of the touch panel. The bending area 502a and the bonding terminal area 504 are respectively arranged on opposite sides of the bonding area 400. Exemplarily, the bending area 502a is located on the lower side of the bonding area 400, and the bonding terminal area 504 is located on the upper side of the bonding area 400. At least part of the bonding area 400 is located within the avoidance space.

[0173] In an exemplary embodiment, as Figure 16 shown, the bonding terminal area 504 may include a first terminal area, a middle terminal area, and a second terminal area. The position of the first terminal area corresponds to the position of the first pin area of the bonding area, and multiple terminals of the first terminal area are correspondingly connected to multiple pins in the first pin area. The position of the middle terminal area corresponds to the position of the middle pin area of the bonding area, and multiple terminals of the middle terminal area are correspondingly connected to multiple pins in the middle area. The position of the second terminal area corresponds to the position of the second pin area of the bonding area, and multiple terminals of the second terminal area are correspondingly connected to multiple pins in the second pin area.

[0174] In an exemplary embodiment, as Figure 16 shown, multiple sensing leads 301 are correspondingly connected to multiple terminals of the first terminal area through multiple pins in the first pin area via the second avoidance groove 520. The first ends of multiple sensing signal lines 506 are correspondingly connected to multiple terminals of the first terminal area, and the second ends of multiple sensing signal lines 506 are connected to the touch driving circuit 505. Thus, the touch driving circuit 505 is connected to multiple sensing leads 301 in the bonding area, and the touch driving circuit 505 provides touch sensing signals to multiple sensing leads 301.

[0175] In an exemplary embodiment, as Figure 16As shown, multiple drive leads 302 are connected to multiple terminals in the second terminal area via multiple pins in the second pin area via the second avoidance groove 520. The first ends of multiple drive signal lines 507 are connected to multiple terminals in the second terminal area, while the second ends of multiple drive signal lines 507 bypass the second avoidance groove 520 to connect to the touch drive circuit 505. This connects the touch drive circuit 505 to the multiple drive leads 302 in the binding area, allowing the touch drive circuit 505 to provide touch sensing signals to the multiple drive leads 302. Because the multiple drive signal lines 507 bypass the binding terminal area 504 to have an end in the first terminal area, the multiple drive signal lines 507 and the multiple sensing signal lines 506 do not overlap in the first circuit area or the second circuit area.

[0176] In one exemplary embodiment, multiple sensing leads 301 are connected to the multiple terminals of the first terminal area via the multiple pins of the first pin area and the cutting lines 523. The first ends of multiple sensing signal lines 506 are connected to the multiple terminals of the first terminal area, and the second ends of the multiple sensing signal lines 506 are connected to the touch driver circuit 505. This connects the touch driver circuit 505 to the multiple sensing leads 301 in the binding area, allowing the touch driver circuit 505 to provide touch sensing signals to the multiple sensing leads 301.

[0177] In one exemplary embodiment, the plurality of drive leads 302 are connected to the plurality of terminals in the second terminal region via the plurality of pins in the second pin region via the cutting lines 523. The first ends of the plurality of drive signal lines 507 are connected to the plurality of terminals in the second terminal region, while the second ends of the plurality of drive signal lines 507 bypass the cutting lines 523 to connect to the touch drive circuit 505. This connects the touch drive circuit 505 to the plurality of drive leads 302 in the binding region, enabling the touch drive circuit 505 to provide touch sensing signals to the plurality of drive leads 302. Because the plurality of drive signal lines 507 bypass the binding terminal region 504 to have an end in the first terminal region, the plurality of drive signal lines 507 and the plurality of sensing signal lines 506 do not overlap in the first circuit region and the second circuit region.

[0178] Figure 17 A cross-sectional view of a display device according to another embodiment of the present invention Figure 1 ,for Figure 16 The cross-sectional view at mark D is shown. Figure 17 As shown, the bending area 502a and the binding terminal area 504 are respectively arranged on two opposite sides of the binding area 400. The plurality of terminals arranged in the binding terminal area 504 are connected to the plurality of pins arranged in the binding pin area 403.

[0179] Figure 18 A cross-sectional view of a display device according to another embodiment of the present application Figure 2 .like Figure 18As shown, part or all of the flexible printed circuit board 500 can be bent to the back of the touch panel (the back is opposite to the side where the display image is located), enabling a narrow bezel design for the display device, avoiding electromagnetic interference between signals, and improving display performance. Moreover, the part of the flexible printed circuit board 500 bent to the back of the touch panel can compensate for the step difference between the touch panel and the source driver circuit 404 in the thickness direction of the display device. Without the need to separately set other components, the bonding area 400 can have a better turning radius, avoiding defects such as broken lines in the bonding area 400 and extending the overall service life of the display device.

[0180] As Figure 18 shown, the bent area 502a of the flexible printed circuit board 500 can be located between the touch area 200 and the bonding terminal area 504 of the touch panel, and the source driver circuit 404 and the bonding terminal area 504 are on the same side of the bonding area 400. The bent area 502a can act as a spacer, avoiding the transmission of electromagnetic signals from the source driver circuit 404 to the side where the touch area 200 is located, avoiding signal interference caused by the electromagnetic signals of the source driver circuit 404, and improving the overall performance of the display device such as touch and display.

[0181] Using the bent area 502a as a spacer can eliminate the separately designed spacer component in the related art, reduce the overall number of parts of the display device, simplify the overall design structure, simplify the assembly process, and reduce the manufacturing cost of the display device. In an exemplary embodiment, as Figure 18 shown, the display device may further include a first substrate 801, a reticulated adhesive layer 802, a foam layer 803, a metal layer 804, and a first adhesive layer 805 disposed between the touch panel and the bent area 502a. The first substrate 801, the reticulated adhesive layer 802, the foam layer 803, the metal layer 804, and the first adhesive layer 805 can be sequentially stacked from the side of the touch panel towards the bent area 502a.

[0182] In an exemplary embodiment, as Figure 18 shown, the display device may further include a second adhesive layer 806 and a second substrate 807 disposed between the bonding area 400 and the bent area 502a. The second substrate 807 can be located on the side close to the bonding area 400. The second substrate 807 can be used to reinforce the strength of the bonding area 400.

[0183] The embodiment of the present application provides a display device, which may include the flexible printed circuit board described in any of the above embodiments. The display device can be: a display panel, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator, or any other product or component with a display function.

[0184] Although the embodiments disclosed in the present invention are as above, the content described is only the embodiments adopted for the convenience of understanding the present invention and is not intended to limit the present invention. Any person skilled in the art within the scope of the present invention may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. A flexible printed circuit board, characterized in that, Comprising: A bonding terminal area, in which a plurality of terminals are arranged at intervals along a first direction; And An avoidance structure, at least a part of which is arranged on one side in the extending direction of the bonding terminal area; the avoidance structure is configured to be able to form an avoidance space, and the avoidance space is used for avoiding a source driving circuit; The avoidance structure includes a bending area, and the bending area is configured to be able to bend relative to the area of the flexible printed circuit board other than the bending area to form the avoidance space; Wherein, the bending area is the bonding terminal area; or, the bending area is a partial area of the flexible printed circuit board other than the bonding terminal area.

2. The flexible printed circuit board according to claim 1, characterized in that, In the structure where the bending area is a partial area of the flexible printed circuit board other than the bonding terminal area, the avoidance structure further includes a first bending part and a second bending part; the first bending part and the second bending part are respectively arranged at both ends in the extending direction of the bonding terminal area; The bending area is further configured to be able to bend relative to the bonding terminal area along the first bending part and the second bending part to form the avoidance space.

3. The flexible printed circuit board according to claim 2, wherein The avoidance structure further includes a second avoidance groove, and the second avoidance groove is located between the first bending part and the second bending part; the second avoidance groove penetrates through the flexible printed circuit board along the thickness direction of the flexible printed circuit board; The second avoidance groove includes a first groove section, a second groove section and a third groove section that are sequentially communicated; the second groove section extends along the first direction; both the first groove section and the third groove section extend along a second direction and towards the bonding terminal area; Wherein, the plane formed by the first direction and the second direction is parallel to the plane where the flexible printed circuit board is located.

4. The flexible printed circuit board according to claim 3, wherein The second avoidance groove forms a first accommodation space, and the opening of the first accommodation space faces the bonding terminal area; at least a part of the bonding terminal area is located in the first accommodation space.

5. The flexible printed circuit board according to claim 2, wherein The thickness of the first bending part is less than the thickness of the bending area; the thickness of the second bending part is less than the thickness of the bending area.

6. The flexible printed circuit board according to claim 2, wherein The avoidance structure further includes a cutting line, and the cutting line is located between the first bending part and the second bending part; the cutting line penetrates through the flexible printed circuit board along the thickness direction of the flexible printed circuit board; The cutting line includes a first line segment, a second line segment and a third line segment that are sequentially connected; the second line segment extends along the first direction; both the first line segment and the third line segment extend along a second direction and towards the bonding terminal area; Wherein, the plane formed by the first direction and the second direction is parallel to the plane where the flexible printed circuit board is located.

7. The flexible printed circuit board according to claim 6, wherein The cutting line forms a second accommodation space, and the opening of the second accommodation space faces the bonding terminal area; at least a part of the bonding terminal area is located in the second accommodation space.

8. The flexible printed circuit board according to claim 6, wherein, The avoidance structure further includes a first weakening hole and a second weakening hole; the first weakening hole is connected to the end of the first line segment far from the second line segment, and the second weakening hole is connected to the end of the third line segment far from the second line segment.

9. The flexible printed circuit board according to any one of claims 1 to 8, characterized in that The binding terminal area includes a first terminal area, a middle terminal area, and a second terminal area arranged in sequence along the first direction; the flexible printed circuit board further includes: A touch driving circuit, the touch driving circuit is located on a side of the binding terminal area away from the avoidance structure, and the touch driving circuit is close to the first terminal area; An external connection port, the external connection port is located on a side of the touch driving circuit away from the binding terminal area; A first signal line, one end of the first signal line is connected to the second terminal area, and the other end of the first signal line bypasses the first terminal area and is connected to the touch driving circuit; A second signal line, one end of the second signal line is connected to the external connection port, and the other end of the second signal line is connected to the middle terminal area; Wherein, the positive projections of the first signal line and the second signal line in the plane of the flexible printed circuit board do not overlap.

10. The flexible printed circuit board according to claim 9, wherein, It further includes a third signal line, one end of the third signal line is connected to the first terminal area, and the other end of the third signal line is connected to the touch driving circuit; Wherein, the positive projections of the first signal line, the second signal line, and the third signal line in the plane of the flexible printed circuit board do not overlap.

11. A display device, characterized in that, It includes a touch panel and the flexible printed circuit board according to any one of claims 1 to 10; the touch panel includes an effective area and a binding area located on one side of the effective area, the binding area includes a binding pin area, the binding pin area includes a plurality of pins, and a plurality of terminals in the binding terminal area of the flexible printed circuit board are correspondingly connected to the plurality of pins in the binding pin area; Wherein, the source driving circuit is located in the binding area.

12. The display device according to claim 11, wherein The plurality of pins in the binding pin area are arranged along the first direction. Along the first direction, the binding pin area includes a first pin area, a middle pin area, and a second pin area arranged in sequence; the plurality of terminals in the first terminal area of the binding terminal area are correspondingly connected to the plurality of pins in the first pin area, the plurality of terminals in the second terminal area of the binding terminal area are correspondingly connected to the plurality of pins in the second pin area, and the plurality of terminals in the middle terminal area of the binding terminal area are correspondingly connected to the plurality of pins in the middle pin area.

13. The display device according to claim 11, characterized in that, In the structure where the avoidance structure includes a first avoidance groove, the source driving circuit is embedded in the first avoidance groove and does not exceed the first avoidance groove; the positive projection of the first avoidance groove in the plane of the flexible printed circuit board covers the positive projection of the source driving circuit in the plane of the flexible printed circuit board; In the structure where the avoidance structure includes a bending area, at least a part of the binding area is located in the avoidance space.

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