Flexible circuit board and display device

Abstract

The utility model relates to the technical field of display, and discloses a flexible circuit board and a display device. The flexible circuit board is used for connecting a display panel and a connector, and comprises a body part and a connecting part, the body part is provided with a binding area, the binding area is used for being bound with the display panel, the binding area is located on the edge portion of the second direction of the body part and extends in the first direction, the second direction intersects with the first direction, the body part is provided with a touch wire and other wires, and the touch wire is at least arranged on the edge area, away from the binding area, of the body part; the connecting part is connected to the body part and connected to an area between the touch wire and the binding area, at least part of the other wires extends to the binding area from the connecting part so that the touch wire and the other wires do not intersect, the connecting part can be bent relative to the body part, the connecting part is provided with a connecting area, and the connecting area is used for being connected with a connector. The noise of a touch signal on the flexible circuit board is relatively low.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a flexible circuit board and a display device including the flexible circuit board. Background Art

[0002] With the development of technology, users have higher and higher requirements on the performance of display terminals, and display terminals are basically integrated with touch functions. However, the touch signals of current display devices are easily interfered and generate noise.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The purpose of the present disclosure is to overcome the above-mentioned deficiencies of the prior art and to provide a flexible circuit board and a display device including the flexible circuit board.

[0005] According to one aspect of the present disclosure, there is provided a flexible circuit board for connecting a display panel and a connector, the flexible circuit board comprising:

[0006] A main body portion having a binding area, the binding area being used to bind to the display panel, the binding area being located at an edge portion of a second direction of the main body portion and extending along a first direction, the second direction intersecting the first direction, the main body portion being provided with touch wiring and other wirings, the touch wiring being provided at least at an edge region of the main body portion away from the binding area;

[0007] A connecting portion is connected to the main body and is located in the area between the touch line and the binding area. At least part of the other lines extends from the connecting portion to the binding area so that the touch line does not cross the other lines. The connecting portion can be bent relative to the main body. The connecting portion has a connecting area, and the connecting area is used to connect the connector.

[0008] In an exemplary embodiment of the present disclosure, the touch routing includes a first portion of touch routing and a second portion of touch routing, the first portion of touch routing and the other routings are led out from the same side of the connecting portion, and the first portion of touch routing and the other routings are bent in opposite directions, the first portion of touch routing is bent toward a side close to the second portion of touch routing, and the second portion of touch routing is arranged on a side of the first portion of touch routing away from the connecting portion.

[0009] In an exemplary embodiment of the present disclosure, the main body has a first end and a second end arranged opposite to each other in the first direction, the connecting portion is connected to the first end, and a fingerprint through hole is provided on the main body, and the fingerprint through hole is located between the first end and the second end.

[0010] In an exemplary embodiment of the present disclosure, a minimum distance between the connecting portion and the fingerprint through hole is greater than or equal to 20 mm and less than or equal to 30 mm.

[0011] In an exemplary embodiment of the present disclosure, the main body further has a first device area, the first device area is located at the second end, a touch driving chip is disposed in the first device area, and the touch wiring is connected to the first device area.

[0012] In an exemplary embodiment of the present disclosure, a non-enclosed groove is provided on the flexible circuit board, and the groove divides the flexible circuit board into the main body part and the connecting part.

[0013] In an exemplary embodiment of the present disclosure, a width of the groove is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

[0014] In an exemplary embodiment of the present disclosure, the groove is a through groove that penetrates the flexible circuit board.

[0015] In an exemplary embodiment of the present disclosure, the groove includes a first sub-groove, a second sub-groove and a third sub-groove connected in sequence, the extension direction of the first sub-groove intersects with the extension direction of the second sub-groove, the extension direction of the third sub-groove intersects with the extension direction of the second sub-groove, the first sub-groove extends into a straight line structure or a curved structure, the second sub-groove extends into a straight line structure or a curved structure, and the third sub-groove extends into a straight line structure or a curved structure.

[0016] In an exemplary embodiment of the present disclosure, in the second direction, a ratio of the length of the connecting portion to the length of the main body portion is greater than or equal to 0.3 and less than or equal to 0.45.

[0017] In an exemplary embodiment of the present disclosure, in the second direction, the length of the connecting portion is greater than or equal to 7 mm and less than or equal to 13 mm.

[0018] In an exemplary embodiment of the present disclosure, the flexible circuit board further includes:

[0019] The first grounding wire is arranged around the edge of the groove.

[0020] In an exemplary embodiment of the present disclosure, the other wirings include a display power line and a display signal line, the width of the display power line is greater than or equal to 0.55 mm and less than or equal to 0.65 mm, and the length of the display power line is greater than or equal to 50 mm and less than or equal to 70 mm.

[0021] In an exemplary embodiment of the present disclosure, the flexible circuit board is a two-layer board.

[0022] According to another aspect of the present disclosure, there is provided a display device, comprising:

[0023] Display panel;

[0024] A flexible circuit board, which is any one of the flexible circuit boards described above, wherein the flexible circuit board is located on the non-display side of the display panel and is bound and connected to the display panel, and the connection portion of the flexible circuit board is bent away from the display panel;

[0025] A connector electrically connected to the connection area of ​​the connection portion;

[0026] A main control circuit board is electrically connected to the connector.

[0027] In an exemplary embodiment of the present disclosure, when the flexible circuit board has a device area, components are arranged in the device area, and the components are located on a side of the flexible circuit board away from the display panel, and the display device further includes:

[0028] A dispensing layer covering the components;

[0029] An adhesive layer is provided between the flexible circuit board and the non-display surface of the display panel, wherein the orthographic projection of the adhesive layer on the display panel does not overlap with the device area, so that a gap is provided between the display panel and the device area.

[0030] In an exemplary embodiment of the present disclosure, components are arranged on a side of the flexible circuit board away from the display panel, and the components are covered by a dispensing layer, and the display panel includes a heat dissipation film, a back film, a display back plate, a polarizer, an adhesive layer, and a cover plate which are sequentially stacked;

[0031] The display panel satisfies at least one of the following conditions:

[0032] The material of the adhesive layer is OCA optical adhesive, the elastic modulus of the adhesive layer is greater than or equal to 0.2Mpa and less than or equal to 0.25Mpa, and the creep of the adhesive layer is less than or equal to 10%;

[0033] The thickness of the backing film is greater than or equal to 100 microns and less than or equal to 150 microns;

[0034] The heat dissipation film comprises a rolled copper foil;

[0035] The heat dissipation film includes a silica gel layer or a foam layer.

[0036] In an exemplary embodiment of the present disclosure, when the flexible circuit board has a device area, components are arranged in the device area, and the components are located on a side of the flexible circuit board away from the display panel, and the display device further includes:

[0037] A dispensing layer covering the components;

[0038] The reinforcing portion is arranged on a side of the flexible circuit board where no components are arranged, or is arranged inside the flexible circuit board, and the orthographic projection of the device area on the display panel overlaps with the orthographic projection of the reinforcing portion on the display panel.

[0039] In the flexible circuit board disclosed in the present invention, on the one hand, the touch line is at least arranged in the edge area of ​​the main body away from the binding area, and the connecting part is connected to the main body and connected to the area between the touch line and the binding area, so that other lines can extend from the connection area of ​​the connecting part to the binding area without crossing the touch line, so that the touch line does not cross other lines, thereby ensuring that other signals will not affect the touch signal, so as to reduce the noise of the touch signal and ensure the touch effect. On the other hand, compared with the "L"-shaped or "T"-shaped flexible circuit boards in the related art, no longer connecting part is provided, which reduces the internal space of the display device occupied by the flexible circuit board, so that a battery with a larger capacity can be provided inside the display device to improve the endurance of the display device, and more heat dissipation materials can also be provided inside the display device to improve the heat dissipation performance of the display device.

[0040] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0042] Figure 1 It is a structural schematic diagram of a first exemplary implementation of a flexible circuit board in the related art.

[0043] Figure 2 It is a structural schematic diagram of a second exemplary implementation of a flexible circuit board in the related art.

[0044] Figure 3 It is a structural schematic diagram of a third exemplary implementation of a flexible circuit board in the related art.

[0045] Figure 4 for Figures 1 to 3 Schematic diagram of the structure of touch wiring and display wiring on the flexible circuit board.

[0046] Figure 5 It is a schematic structural diagram of an exemplary embodiment of a flexible circuit board disclosed in the present invention.

[0047] Figure 6 for Figure 5 Schematic diagram of the routing structure on the flexible circuit board.

[0048] Figure 7 FIG. 4 is a schematic structural diagram of another exemplary embodiment of a flexible circuit board disclosed in the present invention.

[0049] Figure 8 It is a structural schematic diagram of another exemplary embodiment of the flexible circuit board disclosed in the present invention.

[0050] Fig. 9 middle Figure 5 Schematic diagram of the structure of the front side of the flexible circuit board.

[0051] Fig.10 for Figure 5 Schematic diagram of the structure of the back side of the flexible circuit board.

[0052] Fig.11 It is a schematic diagram of the structure of the display device disclosed in the present invention.

[0053] Description of reference numerals:

[0054] 1. Main body; 11. Binding area; 111. Touch pin; 112. Display pin; 12. Touch trace; 121. First part of touch trace; 122. Second part of touch trace; 13. Other traces; 131. Display power line; 132. Display signal line; 14. Fingerprint through hole; 15a. Device area; 15. First device area; 16. Second device area; 17. Groove; 171. First sub-groove; 172. Second sub-groove; 173. Third sub-groove; 181. First ground wire; 182. Second ground wire; 183. Third ground wire;

[0055] 2. Connecting part; 21. Connecting area;

[0056] 10. display panel; 101. heat dissipation film; 102. back film; 103. display back plate; 104. polarizer; 105. adhesive layer; 106. cover plate;

[0057] 20. Flexible circuit board; 30. Connector; 40. Main control circuit board; 50. Adhesive layer; 60. Battery; 70. Glue dispensing layer;

[0058] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0059] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0060] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0061] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0062] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. "And / or" is just a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0063] The inventor discovered that: Figure 1-Figure 3As shown, in the related art, the flexible circuit board 20 of the display device may include a main body portion 1 and a connecting portion 2, wherein the connecting portion 2 is connected to one side of the main body portion 1 in the second direction Y, and a binding area 11 is provided on the other side of the main body portion 1 in the second direction Y, that is, a binding area 11 is provided on the other side of the main body 1 opposite to the connecting portion 2, and the binding area 11 extends along a first direction X, and the first direction X intersects with the second direction Y, for example, the first direction X is perpendicular to the second direction Y. A touch pin 111 is provided on one side of the binding area 11 in the first direction X, and a display pin 112 is provided in the middle of the binding area 11. The binding area 11 is used to bind to the display panel 10, and a connecting area 21 is provided on the other side of the connecting portion 2 opposite to the main body 1, and the connecting area 21 is used to set a connector 30, and the connector 30 is used to connect to the main control circuit board 40. Refer to Figure 1 As shown, the flexible circuit board 20 is set in an "L" shape. Figure 2 As shown, the flexible circuit board 20 is arranged in a "T" shape. Figure 3 As shown, the flexible circuit board 20 is basically set to a "T" shape, and the length of the connecting part 2 is shortened a lot. However, in order to lay out the circuit, a part of the main body 1 is set to a two-layer board structure, and the other part is set to a three-layer board structure, which leads to a significant increase in the cost of the flexible circuit board 20.

[0064] Reference Figure 4 As shown in the figure, since there are a large number of various routing lines, the same routing lines are marked with a double-dash rectangular frame, and the display power line 131 and the display signal line 132 need to be connected from the middle of the binding area 11 to the connector 30 of the connection area 21, so that the display power line 131 and the display signal line 132 generally extend along the second direction Y.

[0065] A touch driver chip is disposed in the first device area 15 on the other side of the first direction X of the flexible circuit board 20, and the touch trace 12 needs to be connected from one side of the first direction X of the binding area 11 to the touch driver chip disposed in the first device area 15 on the other side, so that the touch trace 12 generally extends along the first direction X. As a result, the touch trace 12 will inevitably cross the display power line 131 and the display signal line 132. When the display panel 10 is displaying, signals will inevitably pass through the display power line 131 and the display signal line 132, and the display power line 131 and the display signal line 132 will interfere with the touch trace 12, thereby causing the touch signal to be easily interfered and generate noise.

[0066] The exemplary embodiment of the present disclosure provides a flexible circuit board 20, referring to Figure 5-Figure 10As shown, the flexible circuit board 20 is used to connect the display panel 10 and the connector 30. The flexible circuit board 20 may include a main body 1 and a connecting part 2; the main body 1 has a binding area 11, the binding area 11 is used to bind with the display panel 10, the binding area 11 is located at the edge of the second direction Y of the main body 1, and extends along the first direction X, the second direction Y intersects with the first direction X, the main body 1 is provided with a touch line 12 and other lines 13, the touch line 12 is at least provided in the edge area of ​​the main body 1 away from the binding area 11; the connecting part 2 is connected to the main body 1, and is located in the area between the touch line 12 and the binding area 11, at least part of the other lines 13 extends from the connecting part 2 to the binding area 11, so that the touch line 12 and other lines 13 do not cross, the connecting part 2 can be bent relative to the main body 1, the connecting part 2 has a connecting area 21, and the connecting area 21 is used to connect the connector 30.

[0067] In the flexible circuit board 20 disclosed in the present invention, on one hand, the touch line 12 is at least arranged in the edge area of ​​the main body 1 away from the binding area 11, and the connecting part 2 is connected to the main body 1 and connected to the area between the touch line 12 and the binding area 11, so that other lines 13 can extend from the connecting area 21 of the connecting part 2 to the binding area 11 without crossing the touch line 12, so that the touch line 12 and other lines 13 do not cross, thereby ensuring that other signals will not affect the touch signal, so as to reduce the noise of the touch signal and ensure the touch effect. On the other hand, compared with the "L"-shaped or "T"-shaped flexible circuit board 20 in the related art, no longer connecting part 2 is provided, and the internal space of the battery 60 device occupied by the flexible circuit board 20 is reduced, so that a battery 60 with a larger capacity can be provided inside the battery 60 device to improve the endurance of the display device, and more heat dissipation materials can also be provided inside the display device to improve the heat dissipation performance of the display device.

[0068] In this example embodiment, the flexible circuit board 20 can be used to connect the display panel 10 and the connector 30, so that the display signal can be transmitted between the display panel 10 and the connector 30. The flexible circuit board 20 can be set to a rectangular shape, and the edge extending along the first direction X can be the long side of the flexible circuit board 20, and the first direction X can be the length direction of the flexible circuit board 20. The edge extending along the second direction Y is the short side of the flexible circuit board 20, and the second direction Y can be the width direction of the flexible circuit board 20.

[0069] It should be noted that the rectangle can be not only a strict rectangle, but also a shape similar to a rectangle. For example, the corners of the flexible circuit board 20 can be rounded or straight, and one side edge or both side edges of the flexible circuit board 20 can be curved.

[0070] Of course, the flexible circuit board 20 can also be set to other shapes, for example, the flexible circuit board 20 can also be set to a circle, an ellipse, a trapezoid, other regular or irregular polygons, and so on.

[0071] Specifically, refer to Figure 5 and Figure 6 As shown, Figure 6 Since there are many different routing lines, the same routing lines are marked with a double-dashed rectangular frame. The flexible circuit board 20 may include a main body 1 and a connecting part 2. The main body 1 has a binding area 11. Specifically, the binding area 11 is provided at one side edge of the main body 1 in the second direction Y. The binding area 11 is used to bind with the display panel 10. The binding area 11 extends along a first direction X, and the first direction X intersects with the second direction Y. For example, the first direction X is perpendicular to the second direction Y. A touch pin 111 is provided at a first end of the binding area 11 in the first direction X, and a display pin 112 is provided in the middle of the binding area 11.

[0072] Reference Figure 6 As shown, a touch line 12 and other lines 13 are arranged on the main body 1. The touch line 12 is at least arranged in the edge area of ​​the main body 1 away from the binding area 11. Specifically, the touch line 12 is arranged in the edge areas on both sides of the main body 1 in the first direction X and the edge area on the other side opposite to the binding area 11 in the second direction Y, so that the touch line 12 and the binding area 11 occupy the edge area of ​​the main body 1.

[0073] Reference Figure 5 and Figure 6 As shown, the connecting portion 2 is connected to the main body 1 , and the connecting portion 2 is connected to the area between the touch line 12 and the binding area 11 . The connecting portion 2 has a connecting area 21 , and the connecting area 21 is used to connect the connector 30 , and the connector 30 is used to connect to the main control circuit board 40 .

[0074] Other traces 13 need to be connected from the binding area 11 to the connector 30 , and in particular, the display power line 131 and the display signal line 132 need to be connected from the middle of the binding area 11 to the connector 30 .

[0075] The touch line 12 is arranged at the edge area of ​​the main body 1, and the connecting part 2 is connected to the main body 1 and to the side of the touch line 12 close to the binding area 11, so that other lines 13 do not need to cross the touch line 12 to extend from the connecting area 21 of the connecting part 2 to the binding area 11, so that the touch line 12 does not cross other lines 13, thereby ensuring that other signals will not affect the touch signal, thereby reducing the noise of the touch signal and ensuring the touch effect.

[0076] Furthermore, the connecting portion 2 can be bent relative to the main body 1 , so that the connecting portion 2 and the main body 1 are two relatively independent circuit boards. When the main body 1 is not bent, the connecting portion 2 can be bent.

[0077] In this example implementation, refer to Figure 6 As shown, the touch trace 12 may include a first part of the touch trace 121 and a second part of the touch trace 122. The first part of the touch trace 121 may include a touch power line, and the second part of the touch trace 122 may include a touch signal line and a shielding line. The second part of the touch trace 122 is arranged on a side of the first part of the touch trace 121 away from the connecting portion 2, so that the second part of the touch trace 122 is closer to the edge of the flexible circuit board 20 relative to the first part of the touch trace 121. One end of the second part of the touch trace 122 is connected to the touch pin 111 of the binding area 11, and the other end of the second part of the touch trace 122 is connected to the touch driver chip of the first device area 15.

[0078] The first part of the touch trace 121 and the other traces 13 are led out from the same side of the connection part 2. Specifically, the first part of the touch trace 121 and the other traces 13 are led out from the part where the connection part 2 is connected to the main body 1. Moreover, the first part of the touch trace 121 and the other traces 13 are bent in opposite directions. Specifically, the first part of the touch trace 121 is bent toward the side close to the second part of the touch trace 122, and the other traces 13 are bent toward the middle of the flexible circuit board 20. In this way, the touch trace 12 is almost completely surrounded by the edge area of ​​the flexible circuit board 20, avoiding the noise generated by the crossing of the touch trace 12 and the other traces 13.

[0079] Reference Figure 5 and Figure 6 As shown, the main body 1 has a first end and a second end that are arranged opposite to each other in a first direction X, and the connecting portion 2 is connected to the first end. In addition, a fingerprint through hole 14 may be provided on the main body 1, and the fingerprint through hole 14 may be located between the first end and the second end, so that the fingerprint through hole 14 is basically located in the middle part of the main body 1, and a fingerprint recognition sensor needs to be installed at the position of the fingerprint through hole 14, and the user needs to press the fingerprint recognition sensor to realize fingerprint recognition when using it.

[0080] The minimum spacing between the connecting portion 2 and the fingerprint through hole 14 is greater than or equal to 20 mm and less than or equal to 30 mm. For example, the minimum spacing between the connecting portion 2 and the fingerprint through hole 14 can be 20.5 mm, 21 mm, 21.5 mm, 22 mm, 22.5 mm, 23 mm, 23.5 mm, 24 mm, 24.5 mm, 25 mm, 25.5 mm, 26 mm, 26.5 mm, 27 mm, 27.5 mm, 28 mm, 28.5 mm, 29 mm, 29.5 mm, etc.

[0081] If the minimum distance between the connecting part 2 and the fingerprint through hole 14 is too small, when the user presses the fingerprint recognition sensor to realize fingerprint recognition, a pressing force will be generated on the connecting part 2, affecting the connection between the connecting part 2 and the connector 30, thereby affecting the stability of the signal on the connector 30.

[0082] If the minimum distance between the connecting portion 2 and the fingerprint through hole 14 is too large, a large space of the main body 1 is occupied, which is not conducive to the thinness of the display device.

[0083] The above numerical range not only ensures that when the user presses the fingerprint recognition sensor to realize fingerprint recognition, no pressing force is applied to the connection part 2, thereby ensuring the connection effect between the connection part 2 and the connector 30, thereby ensuring the stability of the signal on the connector 30; but also does not occupy a large space in the main body 1, which is conducive to the thinness of the display device.

[0084] The main body 1 also has a first device area 15, which is located at the second end, that is, the first device area 15 is located on the side of the fingerprint through hole 14 away from the connecting part 2; a touch driver chip can be arranged in the first device area 15, and the touch wiring 12 is connected to the first device area 15, specifically, the touch wiring 12 is connected to the touch driver chip.

[0085] In this example implementation, refer to Figure 5 and Figure 6 As shown, a non-enclosed groove 17 is provided on the flexible circuit board 20, and the groove 17 divides the flexible circuit board 20 into a main body portion 1 and a connecting portion 2. The groove 17 may be a through groove penetrating the flexible circuit board 20.

[0086] Specifically, the groove 17 may include a first sub-groove 171, a second sub-groove 172 and a third sub-groove 173 connected in sequence, and the extension direction of the first sub-groove 171 intersects with the extension direction of the second sub-groove 172, for example, the first sub-groove 171 extends along the second direction Y, and the second sub-groove 172 extends along the first direction X, so that the extension direction of the first sub-groove 171 is perpendicular to the extension direction of the second sub-groove 172; the extension direction of the third sub-groove 173 intersects with the extension direction of the second sub-groove 172, for example, the third sub-groove 173 extends along the second direction Y, and the second sub-groove 172 extends along the first direction X, so that the extension direction of the third sub-groove 173 is perpendicular to the extension direction of the second sub-groove 172.

[0087] The first sub-groove 171 extends into a straight line structure, the second sub-groove 172 extends into a straight line structure, and the third sub-groove 173 extends into a straight line structure. That is, the first sub-groove 171, the second sub-groove 172 and the third sub-groove 173 extend into a straight line shape, or the first sub-groove 171, the second sub-groove 172 and the third sub-groove 173 can be set as straight line grooves. In this case, the groove 17 is basically a "U"-shaped groove 17, and the opening of the "U"-shaped groove 17 faces the binding area 11.

[0088] Of course, in some other exemplary embodiments of the present disclosure, reference Figure 7 As shown, the first sub-groove 171 extends into a curved structure, the second sub-groove 172 extends into a curved structure, and the third sub-groove 173 extends into a curved structure. That is, the first sub-groove 171, the second sub-groove 172 and the third sub-groove 173 can be set as curved grooves, that is, the first sub-groove 171, the second sub-groove 172 and the third sub-groove 173 extend to form a curved shape. In addition, the opening of the "U"-shaped groove 17 can also face the opposite sides of the first direction X, that is, it can be Figure 5 The groove 17 in the groove 17 is rotated 90 degrees clockwise or counterclockwise. Of course, it is also possible to Figure 5 The groove 17 in the middle is rotated clockwise or counterclockwise to set an angle, and the set angle can be set as needed.

[0089] In some other example embodiments of the present disclosure, one of the first sub-groove 171, the second sub-groove 172 and the third sub-groove 173 may extend into a straight structure, and the other two may extend into a curved structure; or two of the first sub-groove 171, the second sub-groove 172 and the third sub-groove 173 may extend into a straight structure, and the other one may extend into a curved structure.

[0090] It should be noted that, the first sub-groove 171, the second sub-groove 172 and the third sub-groove 173 of the curved structure can be not only that the two side walls of the first sub-groove 171, the second sub-groove 172 and the third sub-groove 173 extending along the extension direction are both set as curved side walls, but also that only one of the side walls of the first sub-groove 171, the second sub-groove 172 and the third sub-groove 173 extending along the extension direction is set as a curved side wall.

[0091] In addition, the groove 17 can be set as a circular groove with a notch, an elliptical groove with a notch, or various regular or irregular polygonal grooves with a notch, etc. The position of the notch is the position where the connecting part 2 is connected to the main body 1.

[0092] The width of the groove 17 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm. For example, the width of the groove 17 can be 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.35 mm, 1.4 mm, 1.45 mm, etc. The width of the groove 17 refers to the vertical distance of the gap between the connecting portion 2 and the main body portion 1.

[0093] If the width of the groove 17 is too small, interference between the connecting portion 2 and the main body 1 is likely to occur, which is not conducive to the bending of the connecting portion 2. If the width of the groove 17 is too large, the groove 17 occupies too large an area of ​​the flexible circuit board 20, which is not conducive to the layout of the flexible circuit board 20.

[0094] The above numerical range not only ensures that there is no interference between the connecting portion 2 and the main body 1 so that the connecting portion 2 can be bent smoothly, but also the groove 17 occupies a small area of ​​the flexible circuit board 20 and does not affect the layout of the flexible circuit board 20.

[0095] In some other example embodiments of the present disclosure, the groove 17 may be a blind groove that does not penetrate the flexible circuit board 20. Specifically, the groove 17 may penetrate at least one conductive functional layer of the flexible circuit board 20, and the penetrated conductive functional layer may be peeled off from other parts of the flexible circuit board 20 to form a connecting portion 2.

[0096] In the above case, the connection part 2 and the body part 1 are an integrally formed flexible circuit board 20, and then the groove 17 is processed on the flexible circuit board 20 to divide the flexible circuit board 20 into the connection part 2 and the body part 1 connected to each other.

[0097] In the second direction Y, the ratio of the length of the connecting portion 2 to the length of the main body 1 is greater than or equal to 0.3 and less than or equal to 0.45. For example, the ratio of the length of the connecting portion 2 to the length of the main body 1 can be 0.33, 0.35, 0.38, 0.4, 0.42, etc.

[0098] Specifically, in the second direction Y, the length of the connecting portion 2 is greater than or equal to 7 mm and less than or equal to 13 mm. For example, the length of the connecting portion 2 may be 7.3 mm, 7.5 mm, 7.8 mm, 8 mm, 8.2 mm, 8.5 mm, 8.7 mm, 9 mm, 9.3 mm, 9.5 mm, 9.8 mm, 10 mm, 10.2 mm, 10.5 mm, 10.7 mm, 11 mm, 11.3 mm, 11.5 mm, 11.8 mm, 12 mm, 12.2 mm, 12.5 mm, 12.7 mm, and the like.

[0099] If the ratio of the length of the connecting portion 2 to the length of the main body 1 is too small, the length of the connecting portion 2 is too small, which affects the flexibility of the connecting portion 2 in folding, and makes the connecting portion 2 unable to bend smoothly. Even if the connecting portion 2 is barely bent, it will generate greater bending stress and pulling force.

[0100] If the ratio of the length of the connecting portion 2 to the length of the main body 1 is too large, the length of the connecting portion 2 is too large, occupying a larger space of the flexible circuit board 20, which is not conducive to improving the space utilization rate of the flexible circuit board 20; and a large margin is generated after the connecting portion 2 is bent, which makes the connecting portion 2 easy to shake, which can easily cause poor reliability of the entire display device.

[0101] The above numerical range not only ensures that the connection part 2 can be bent smoothly, and basically does not generate bending stress and pulling force after bending; but also does not occupy a large space of the flexible circuit board 20, which can ensure the space utilization rate of the flexible circuit board 20. The connection part 2 is not easy to shake after bending, and will not cause poor reliability of the display device. That is, the length of the connection part 2 is as short as possible while meeting the requirements of bending and buckling.

[0102] In some further example embodiments of the present disclosure, the groove 17 may not be provided on the flexible circuit board 20, and the connecting portion 2 and the main body portion 1 may be formed separately and then connected into an integrated structure through a connecting member. In this case, the main body portion 1 is an integral structure.

[0103] In some further example embodiments of the present disclosure, referring to Figure 8 As shown, a groove 17 or a through hole can be set on the flexible circuit board 20, and the connecting part 2 and the main body 1 can be formed separately, and then the connecting part 2 is connected to the main body 1 through a connecting piece, and connected to one side edge of the groove 17 or the through hole, so that the connecting part 2 and the main body 1 are connected as an integrated structure.

[0104] In this example implementation, refer to Figure 6 As shown, the flexible circuit board 20 may further include a first grounding wire 181, and the first grounding wire 181 is arranged around the edge of the groove 17, that is, the first grounding wire 181 is arranged on the edge of the groove 17 close to the connecting part 2 and the edge away from the connecting part 2, so that the first grounding wire 181 is arranged to surround the groove 17 for at least one circle. The signal on the connecting part 2 can be shielded and isolated from the signal on the main body 1 through the first grounding wire 181 to avoid noise generated between them due to close distance.

[0105] The flexible circuit board 20 may further include a second grounding wire 182, which is arranged around the edge of the fingerprint through hole 14, so that the second grounding wire 182 is arranged to surround at least one circle of the fingerprint through hole 14. The second grounding wire 182 can be used to shield and isolate the signal in the fingerprint through hole 14 from the signal on the main body 1 to avoid noise generated between them at a close distance.

[0106] The flexible circuit board 20 may further include a third grounding line 183 , which is disposed around the periphery of the touch trace 12 . The touch signal and the signal on the main body 1 may be shielded and isolated by the third grounding line 183 to avoid noise generated between them at a close distance.

[0107] The first grounding wire 181, the second grounding wire 182, and the third grounding wire 183 can be arranged on the same conductive layer of the flexible circuit board 20, or on different conductive layers of the flexible circuit board 20. Moreover, the entire first grounding wire 181 can be arranged on the same conductive layer of the flexible circuit board 20; in the case of interference with other adjacent wires, a part of the first grounding wire 181 can be arranged on one conductive layer of the flexible circuit board 20, and another part of the first grounding wire 181 can be arranged on another conductive layer of the flexible circuit board 20, and the two parts can be connected through a via arranged on the insulating layer.

[0108] Similarly, the entire second grounding wire 182 may be disposed on the same conductive layer of the flexible circuit board 20; in the case of interference with other adjacent wires, a portion of the second grounding wire 182 may be disposed on one conductive layer of the flexible circuit board 20, and another portion of the second grounding wire 182 may be disposed on another conductive layer of the flexible circuit board 20, and the two portions may be connected via a via disposed on the insulating layer. The entire third grounding wire 183 may be disposed on the same conductive layer of the flexible circuit board 20; in the case of interference with other adjacent wires, a portion of the third grounding wire 183 may be disposed on one conductive layer of the flexible circuit board 20, and another portion of the third grounding wire 183 may be disposed on another conductive layer of the flexible circuit board 20, and the two portions may be connected via a via disposed on the insulating layer.

[0109] In this example implementation, refer to Figure 6 As shown, other traces 13 may include a display power line 131 and a display signal line 132. The width of the display power line 131 is greater than or equal to 0.55 mm and less than or equal to 0.65 mm. For example, the width of the display power line 131 may be 0.57 mm, 0.59 mm, 0.6 mm, 0.62 mm, 0.64 mm, etc.

[0110] Moreover, the length of the display power line 131 is greater than or equal to 50 mm and less than or equal to 70 mm. For example, the length of the display power line 131 can be 52 mm, 54 mm, 56 mm, 58 mm, 60 mm, 62 mm, 64 mm, 66 mm, 68 mm, etc.

[0111] Compared with the structure in the related art, the length of the display power line 131 in the present disclosure is shortened by 70% to 80%, that is, the ratio of the length of the display power line 131 in the present disclosure to the length of the display power line 131 in the related art is greater than or equal to 0.2 and less than or equal to 0.3. The length of the display power line 131 is reduced, so that the resistance of the display power line 131 is reduced, and the width of the display power line 131 is inversely proportional to the resistance. Therefore, under the condition that the resistance of the display power line 131 is not increased, the width of the display power line 131 can be reduced, thereby improving the space utilization rate of the flexible circuit board 20.

[0112] In this example implementation, refer to Figure 6 As shown, a portion of the display signal line 132 is configured as a serpentine bending structure. The resistances of the multiple display signal lines 132 are generally required to be substantially the same, so that the lengths and widths of the multiple display signal lines 132 are required to be substantially the same. However, since the display signal line 132 is not a straight line but a curve, the length of the display signal line 132 located on the inner side of the bend is shorter, and the length of the display signal line 132 located on the outer side of the bend is longer. By configuring a portion of the display signal line 132 as a serpentine bending structure, the length of the display signal line 132 can be increased. Moreover, the number of serpentine bending structures included in the display signal line 132 on the inner side of the bend is greater than the number of serpentine bending structures included in the display signal line 132 on the outer side of the bend.

[0113] A shielding line is disposed between two adjacent display signal lines 132 , and the display signal between the two adjacent display signal lines 132 is isolated by the shielding line.

[0114] The flexible circuit board 20 may be a two-layer board, that is, the flexible circuit board 20 may include two conductive layers. Specifically, the flexible circuit board 20 may include a base layer, a first conductive layer, a second conductive layer, a first covering layer, and a second covering layer. The first conductive layer and the second conductive layer are arranged on two opposite layers of the base layer. The first covering layer is arranged on a side of the first conductive layer away from the base layer, and the second covering layer is arranged on a side of the second conductive layer away from the base layer. Various wires are arranged on the first conductive layer and the second conductive layer. Figure 4 and Figure 6 The wires of different conductive layers are represented by different line types. Figure 3 In the related art shown, the flexible circuit board 20 is configured as a structure combining a two-layer board and a three-layer board. When the area of ​​the flexible circuit board 20 is the same, the cost is reduced by about 20%.

[0115] Based on the same inventive concept, the exemplary embodiment of the present disclosure provides a display device, referring to Fig.11 As shown, the display device may include a display panel 10, a flexible circuit board 20, a connector 30 and a main control circuit board 40; the flexible circuit board 20 is any one of the flexible circuit boards 20 described above, the flexible circuit board 20 is located on the non-display side of the display panel 10 and is bound and connected to the display panel 10, and the connecting portion 2 of the flexible circuit board 20 is bent toward the side away from the display panel 10; the connector 30 is electrically connected to the connecting area 21 of the connecting portion 2; the main control circuit board 40 is electrically connected to the connector 30.

[0116] The display panel 10 may include a heat dissipation film 101 , a back film 102 , a display back plate 103 , a polarizer 104 , an adhesive layer 105 , a cover plate 106 , etc., which are stacked in sequence.

[0117] The display backplane 103 can be a liquid crystal display backplane 103, an OLED (Organic Electroluminescence Display) display backplane 103, a QLED (Quantum Dot Light Emitting Diodes) display backplane 103, etc. The display backplane 103 has a display side and a non-display side, the display side and the non-display side are arranged opposite to each other, the display side can display a picture, the side that displays the picture is the display surface, and the outer side surface of the cover plate 106 can be the display surface.

[0118] The specific structure of the flexible circuit board 20 has been described in detail above, so it will not be repeated here. The flexible circuit board 20 is bound to the display panel 10, specifically, the binding area 11 of the flexible circuit board 20 is bound to the display panel 10. Moreover, the flexible circuit board 20 can be bent at the non-display side of the display panel 10 opposite to the display surface.

[0119] The connection portion 2 of the flexible circuit board 20 can be bent toward the side away from the display panel 10. Specifically, the connection portion 2 is first bent toward the side away from the display panel 10, and the bending angle is about 90 degrees; the end of the connection portion 2 away from the display panel 10 is then bent toward the side close to the binding area.

[0120] The connector 30 is electrically connected to the connection area 21 of the connection part 2. Specifically, when the connection part 2 is not bent, the connector 30 is electrically connected to the side of the connection part 2 facing away from the display panel 10. When the connection part 2 is bent, the connector 30 is located on the side of the connection part 2 close to the display panel 10.

[0121] The main control circuit board 40 is electrically connected to the connector 30 . Specifically, a connector that matches the connector 30 is disposed on the main control circuit board 40 . The connector is connected to the connector 30 , thereby connecting the main control circuit board 40 to the flexible circuit board 20 .

[0122] In this example implementation, refer to Fig. 9 As shown, the flexible circuit board 20 has a device area 15a, and the device area 15a may include a first device area 15 and a second device area 16. Components are arranged in the device area 15a, that is, components are arranged in the first device area 15 and the second device area 16, and the components are located on the side of the flexible circuit board 20 away from the display panel 10. Since the components have push-pull forces and other reliability requirements, it is usually necessary to perform glue dispensing on at least part of the components, that is, the components are covered with a glue dispensing layer 70. After the glue dispensing is completed, high-temperature curing is usually required. After curing, the glue surface of the glue dispensing layer 70 will have a certain "shrinkage", and the flexible circuit board 20 needs to have a certain pressure when punching, which will cause the flexible circuit board 20 to be partially "micro-convex". Correspondingly, after being bonded to the display panel 10, the display device is prone to poor mold printing, and the poor mold printing is mainly manifested in the deformation of the adhesive layer 105.

[0123] In this example implementation, refer to Fig.10 and Fig.11 As shown, the display device may further include an adhesive layer 50 , which may be a double-sided adhesive. The adhesive layer 50 is disposed between the flexible circuit board 20 and the non-display surface of the display panel 10 , and the flexible circuit board 20 is bonded to the non-display surface of the display panel 10 through the adhesive layer 50 .

[0124] Poor stenciling can be alleviated by isolating part of the display panel 10 and the flexible circuit board 20. Specifically, the orthographic projection of the adhesive layer 50 on the display panel 10 does not overlap with the device area 15a, that is, the adhesive layer 50 is not provided in the device area 15a, so that a gap is provided between the display panel 10 and the device area 15a, so that the pressure of the flexible circuit board 20 on the display panel 10 in the device area 15a is zero, thereby avoiding stenciling.

[0125] Specifically, when the flexible circuit board 20 may have a first device area 15 and a second device area 16, the first device area 15 and the second device area 16 may be arranged on opposite sides of the fingerprint through hole 14 in the first direction X, and the orthographic projection of the adhesive layer 50 on the display panel 10 does not overlap with the first device area 15 and the second device area 16, that is, the adhesive layer 50 is not arranged in the first device area 15 and the second device area 16, so that a gap is arranged between the display panel 10 and the first device area 15 and the second device area 16, so that the pressure of the flexible circuit board 20 on the display panel 10 in the first device area 15 and the second device area 16 is zero, avoiding the generation of mold printing. In addition, for the convenience of the process, the area without the adhesive layer 50 can be connected as a whole, so that the area without the adhesive layer 50 is larger than the first device area 15 and the second device area 16.

[0126] Of course, in some other example embodiments of the present disclosure, when more device regions 15a are provided, no adhesive layer 50 may be provided between each device region 15a and the display panel 10, so that a gap is provided between each device region 15a and the display panel 10 to avoid mold imprinting.

[0127] In other exemplary embodiments of the present disclosure, the mold printing failure can be alleviated by increasing the strength of the display panel 10 itself. Specifically, the material of the adhesive layer 105 between the cover plate 106 and the polarizer 104 can be OCA (Optically Clear Adhesive) optical adhesive, and the elastic modulus of the adhesive layer 105 is relatively high. Specifically, the elastic modulus of the adhesive layer 105 is greater than or equal to 0.2 MPa and less than or equal to 0.25 MPa. For example, the elastic modulus of the adhesive layer 105 can be 0.21 MPa, 0.215 MPa, 0.22 MPa, 0.225 MPa, 0.23 MPa, 0.235 MPa, 0.24 MPa, 0.245 MPa, and the like. Moreover, the creep of the adhesive layer 105 is low. Specifically, the creep of the adhesive layer 105 may be less than or equal to 10%. For example, the creep of the adhesive layer 105 may be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, etc.

[0128] The elastic modulus can be regarded as an indicator of the ease with which a material can produce elastic deformation. The larger its value, the greater the stress required to produce a certain elastic deformation of the material, that is, the greater the material stiffness, the smaller the elastic deformation under a certain stress. Creep is the phenomenon that the strain of a solid material increases over time while the stress remains constant.

[0129] The adhesive layer 105 has a high elastic modulus and low creep, so that the adhesive layer 105 is not easily deformed, thereby reducing mold printing defects.

[0130] In addition, the thickness of the back film 102 can be set thicker. Specifically, the thickness of the back film 102 is greater than or equal to 100 microns and less than or equal to 150 microns. For example, the thickness of the back film 102 can be 103 microns, 105 microns, 108 microns, 110 microns, 112 microns, 115 microns, 117 microns, 120 microns, 123 microns, 125 microns, 128 microns, 130 microns, 132 microns, 135 microns, 137 microns, 140 microns, 143 microns, 145 microns, 148 microns, etc. The thickness of the back film 102 is set thicker, so that the pressure transmitted to the adhesive layer 105 is smaller, thereby reducing poor mold printing.

[0131] Furthermore, the heat dissipation film 101 may include rolled copper foil, which is a product (usually 4-100 microns thick and usually <800 mm wide) made by repeatedly rolling and annealing a high-precision copper strip (usually less than 150 microns thick) using the principle of plastic processing, and has better ductility, bending resistance, and conductivity than electrolytic copper foil. The rolled copper foil has a higher elastic modulus, which can isolate the pressure of components, making it difficult for the pressure of components to be transmitted to the adhesive layer 105, thereby reducing mold printing defects.

[0132] Furthermore, the heat dissipation film 101 may further include a silicone layer or a foam layer. The silicone layer or the foam layer has a certain elasticity and can absorb the pressure of components, so that the pressure of the components is not easily transferred to the adhesive layer 105, thereby reducing poor mold printing.

[0133] In addition, it should be noted that the above-mentioned embodiments for increasing the strength of the display panel 10 itself can be used alone or in combination, and will not be described one by one here.

[0134] In some other exemplary embodiments of the present disclosure, the mold printing failure can be alleviated by increasing the strength of the flexible circuit board 20 itself. Specifically, when the flexible circuit board 20 has the device area 15a, the display device can further include a reinforcement part, which can be provided on the side of the flexible circuit board 20 where no components are provided. The reinforcement part can isolate the pressure of the components, so that the pressure of the components is not easily transmitted to the adhesive layer 105, thereby alleviating the mold printing failure.

[0135] Of course, the reinforcement part can be arranged inside the flexible circuit board 20. For example, the strength of the flexible circuit board 20 can be increased by increasing the thickness of the base layer of the flexible circuit board 20. The pressure of the components can be isolated by the flexible circuit board 20, so that the pressure of the components is not easily transmitted to the adhesive layer 105, thereby reducing poor mold printing.

[0136] In addition, it should be noted that the above-mentioned embodiments for increasing the strength of the flexible circuit board 20 itself can be used alone or in combination, and will not be described one by one here.

[0137] Moreover, the orthographic projection of the device area 15a on the display panel 10 overlaps with the orthographic projection of the reinforcement part on the display panel 10. For example, the edge line of the orthographic projection of the device area 15a on the display panel 10 may coincide with the edge line of the orthographic projection of the reinforcement part on the display panel 10, or a part of the orthographic projection of the device area 15a on the display panel 10 may coincide with a part of the orthographic projection of the reinforcement part on the display panel 10, or the orthographic projection of the reinforcement part on the display panel 10 may cover and be larger than the orthographic projection of the device area 15a on the display panel 10, or the orthographic projection of the device area 15a on the display panel 10 may cover and be larger than the orthographic projection of the reinforcement part on the display panel 10.

[0138] The display device may further include a battery 60, which is disposed on a side of the flexible circuit board 20 facing away from the display panel 10. The flexible circuit board 20 is not provided with a long connecting portion 2, thereby reducing the internal space of the display device occupied by the flexible circuit board 20, so that a battery with a larger capacity can be disposed inside the display device to improve the battery life of the display device, and more heat dissipation materials can also be disposed inside the display device to improve the heat dissipation performance of the display device.

[0139] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A flexible circuit board for connecting a display panel and a connector, characterized in that: The flexible circuit board comprises: A main body portion having a binding area, the binding area being used to bind to the display panel, the binding area being located at an edge portion of a second direction of the main body portion and extending along a first direction, the second direction intersecting the first direction, the main body portion being provided with touch wiring and other wirings, the touch wiring being provided at least at an edge region of the main body portion away from the binding area; A connecting portion is connected to the main body and is located in the area between the touch line and the binding area. At least part of the other lines extends from the connecting portion to the binding area so that the touch line does not cross the other lines. The connecting portion can be bent relative to the main body. The connecting portion has a connecting area, and the connecting area is used to connect the connector.

2. The flexible circuit board according to claim 1, characterized in that: The touch routing includes a first portion of touch routing and a second portion of touch routing, the first portion of touch routing and the other routings are led out from the same side of the connecting portion, and the first portion of touch routing and the other routings are bent in opposite directions, the first portion of touch routing is bent toward a side close to the second portion of touch routing, and the second portion of touch routing is arranged on a side of the first portion of touch routing away from the connecting portion.

3. The flexible circuit board according to claim 1, characterized in that: The main body has a first end and a second end that are arranged opposite to each other in the first direction, the connecting portion is connected to the first end, and a fingerprint through hole is arranged on the main body, and the fingerprint through hole is located between the first end and the second end.

4. The flexible circuit board according to claim 3, characterized in that: The minimum distance between the connecting portion and the fingerprint through hole is greater than or equal to 20 mm and less than or equal to 30 mm.

5. The flexible circuit board according to claim 3, characterized in that: The main body also has a first device area, the first device area is located at the second end, a touch driving chip is arranged in the first device area, and the touch wiring is connected to the first device area.

6. The flexible circuit board according to any one of claims 1 to 5, characterized in that: A non-enclosed groove is arranged on the flexible circuit board, and the groove divides the flexible circuit board into the main body part and the connecting part.

7. The flexible circuit board according to claim 6, characterized in that: The width of the groove is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

8. The flexible circuit board according to claim 6, characterized in that: The groove is a through groove that penetrates the flexible circuit board.

9. The flexible circuit board according to claim 6, characterized in that: The groove includes a first sub-groove, a second sub-groove and a third sub-groove connected in sequence, the extension direction of the first sub-groove intersects with the extension direction of the second sub-groove, the extension direction of the third sub-groove intersects with the extension direction of the second sub-groove, the first sub-groove extends into a straight line structure or a curved structure, the second sub-groove extends into a straight line structure or a curved structure, and the third sub-groove extends into a straight line structure or a curved structure.

10. The flexible circuit board according to claim 6, characterized in that: In the second direction, a ratio of the length of the connecting portion to the length of the main body portion is greater than or equal to 0.3 and less than or equal to 0.

45.

11. The flexible circuit board according to claim 6, characterized in that: In the second direction, the length of the connecting portion is greater than or equal to 7 mm and less than or equal to 13 mm.

12. The flexible circuit board according to claim 6, characterized in that: The flexible circuit board also includes: The first grounding wire is arranged around the edge of the groove.

13. The flexible circuit board according to any one of claims 1 to 5, characterized in that: The other wirings include a display power line and a display signal line. The width of the display power line is greater than or equal to 0.55 mm and less than or equal to 0.65 mm. The length of the display power line is greater than or equal to 50 mm and less than or equal to 70 mm.

14. The flexible circuit board according to any one of claims 1 to 5, characterized in that: The flexible circuit board is a two-layer board.

15. A display device, characterized in that: include: Display panel; A flexible circuit board, which is a flexible circuit board according to any one of claims 1 to 14, wherein the flexible circuit board is located on the non-display side of the display panel and is bound and connected to the display panel, and the connection portion of the flexible circuit board is bent away from the display panel; a connector electrically connected to the connection area of ​​the connection portion; A main control circuit board is electrically connected to the connector.

16. The display device according to claim 15, characterized in that: When the flexible circuit board has a device area, components are arranged in the device area, and the components are located on a side of the flexible circuit board away from the display panel. The display device further includes: A dispensing layer covering the components; An adhesive layer is provided between the flexible circuit board and the non-display surface of the display panel, and the orthographic projection of the adhesive layer on the display panel does not overlap with the device area, so that a gap is provided between the display panel and the device area.

17. The display device according to claim 15, characterized in that: The flexible circuit board is provided with components on one side away from the display panel, and the components are covered by a dispensing layer. The display panel includes a heat dissipation film, a back film, a display back plate, a polarizer, an adhesive layer and a cover plate which are stacked in sequence; The display panel satisfies at least one of the following conditions: The material of the adhesive layer is OCA optical adhesive, the elastic modulus of the adhesive layer is greater than or equal to 0.2Mpa and less than or equal to 0.25Mpa, and the creep of the adhesive layer is less than or equal to 10%; The thickness of the backing film is greater than or equal to 100 microns and less than or equal to 150 microns; The heat dissipation film comprises a rolled copper foil; The heat dissipation film includes a silica gel layer or a foam layer.

18. The display device according to claim 15, characterized in that: When the flexible circuit board has a device area, components are arranged in the device area, and the components are located on a side of the flexible circuit board away from the display panel. The display device further includes: A dispensing layer covering the components; The reinforcing portion is arranged on a side of the flexible circuit board where no components are arranged, or is arranged inside the flexible circuit board, and the orthographic projection of the device area on the display panel overlaps with the orthographic projection of the reinforcing portion on the display panel.

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