Flexible circuit board and display device

Abstract

The present disclosure relates to the technical field of display. Disclosed are a flexible circuit board and a display device. The flexible circuit board is adapted to connect a display panel and a connector. The flexible circuit board comprises a body part and a connecting part. The body part is provided with a binding area; the binding area is adapted to bind with the display panel; the binding area is located at an edge part of the body part in a second direction and extends in a first direction, wherein the second direction intersects with the first direction; touch wires and other wires are arranged on the body part; the touch wires are at least arranged in an edge area of the body part away from the binding area. The connecting part is connected to the body part and connected to an area between the touch wires and the binding area; at least part of the other wires extend to the binding area from the connecting part, so that the touch wires do not intersect with the other wires; the connecting part is capable of being bent relative to the body part; the connecting part is provided with a connecting area; the connecting area is adapted to connect the connector. A touch signal on the flexible circuit board exhibits low noise.

Description

Flexible circuit board and display device

[0001] Cross-references

[0002] The present disclosure claims priority to Chinese patent application number 202410122171.5 filed on January 29, 2024, entitled “Flexible Circuit Board and Display Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] 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

[0004] With the development of technology, users have higher and higher requirements for 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 with and generate noise.

[0005] 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 prior art known to ordinary technicians in the field. Summary of the Invention

[0006] The purpose of the present disclosure is to overcome the above-mentioned deficiencies in the prior art and to provide a flexible circuit board and a display device including the flexible circuit board.

[0007] According to one aspect of the present disclosure, a flexible circuit board is provided for connecting a display panel and a connector, the flexible circuit board comprising:

[0008] 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 the main body portion in a second direction and extending along a first direction, the second direction intersecting the first direction, the main body portion being provided with touch lines and other lines, the touch lines being provided at least at an edge region of the main body portion away from the binding area;

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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 driver chip is provided in the first device area, and the touch trace is connected to the first device area.

[0014] 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 portion and the connecting portion.

[0015] 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.

[0016] In an exemplary embodiment of the present disclosure, the groove is a through groove that passes through the flexible circuit board.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] In an exemplary embodiment of the present disclosure, the flexible circuit board further includes:

[0021] The first grounding wire is arranged around the edge of the groove.

[0022] 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.

[0023] In an exemplary embodiment of the present disclosure, the flexible circuit board is a two-layer board.

[0024] According to another aspect of the present disclosure, there is provided a display device, comprising:

[0025] Display panel;

[0026] A flexible circuit board, comprising any one of the above-mentioned flexible circuit boards, 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;

[0027] a connector electrically connected to the connection area of ​​the connection portion;

[0028] A main control circuit board is electrically connected to the connector.

[0029] In an exemplary embodiment of the present disclosure, when the flexible circuit board has a device area, components are provided in the device area, and the components are located on a side of the flexible circuit board facing away from the display panel. The display device further includes:

[0030] a dispensing layer covering the components;

[0031] 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.

[0032] In an exemplary embodiment of the present disclosure, components are provided on a side of the flexible circuit board facing 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 stacked in sequence.

[0033] The display panel satisfies at least one of the following conditions:

[0034] The material of the adhesive layer is OCA optical adhesive, the elastic modulus of the adhesive layer is greater than or equal to 0.2 MPa and less than or equal to 0.25 MPa, and the creep of the adhesive layer is less than or equal to 10%;

[0035] The thickness of the backing film is greater than or equal to 100 microns and less than or equal to 150 microns;

[0036] The heat dissipation film includes rolled copper foil;

[0037] The heat dissipation film includes a silica gel layer or a foam layer.

[0038] In an exemplary embodiment of the present disclosure, when the flexible circuit board has a device area, components are provided in the device area, and the components are located on a side of the flexible circuit board facing away from the display panel. The display device further includes:

[0039] a dispensing layer covering the components;

[0040] The reinforcing portion is provided on a side of the flexible circuit board where no components are provided, or is provided 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.

[0041] 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 disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are incorporated into 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 drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0043] FIG1 is a schematic structural diagram of a first exemplary embodiment of a flexible circuit board in the related art.

[0044] FIG. 2 is a schematic structural diagram of a second exemplary embodiment of a flexible circuit board in the related art.

[0045] FIG3 is a schematic structural diagram of a third exemplary embodiment of a flexible circuit board in the related art.

[0046] FIG4 is a schematic structural diagram of touch wiring and display wiring on the flexible circuit board in FIG1 to FIG3.

[0047] FIG5 is a schematic structural diagram of an exemplary embodiment of a flexible circuit board disclosed herein.

[0048] FIG. 6 is a schematic structural diagram of wiring on the flexible circuit board in FIG. 5 .

[0049] FIG. 7 is a schematic structural diagram of another exemplary embodiment of a flexible circuit board according to the present disclosure.

[0050] FIG8 is a schematic structural diagram of yet another exemplary embodiment of a flexible circuit board according to the present disclosure.

[0051] FIG9 is a schematic structural diagram of the front side of the flexible circuit board in FIG5 .

[0052] FIG10 is a schematic structural diagram of the back side of the flexible circuit board in FIG5 .

[0053] FIG11 is a schematic structural diagram of a display device disclosed herein.

[0054] Explanation of Reference Numerals: 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 line; 182. Second ground line; 183. Third ground line; 2. Connecting portion; 21. Connecting area; 10. Display panel; 101. Heat dissipation film; 102. Back film; 103. Display backplane; 104. Polarizer; 105. Adhesive layer; 106. Cover plate; 20. Flexible circuit board; 30. Connector; 40. Main control circuit board; 50. Adhesive layer; 60. Battery; 70. Glue layer; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0055] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent identical or similar structures, and thus their detailed descriptions will be omitted. Furthermore, the figures are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0056] Although relative terms such as "upper" and "lower" are used in this specification to describe the relationship of one illustrated component to another, these terms are used herein for convenience only, such as in accordance with the orientation of the illustrations in the accompanying drawings. It will be understood that if the illustrated device were flipped upside down, the component described as "upper" would become the component "lower." When a structure is referred to as "on" another structure, this may mean that the structure is integrally formed with the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via the other structure.

[0057] 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 open-ended inclusion and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used only as labels and are not intended to limit the quantity of their objects.

[0058] In this application, unless otherwise specified or limited, the term "connected" should be understood broadly. For example, "connected" can mean fixed, removable, or integrated; it can be directly connected or indirectly connected through an intermediary. "And / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0059] The inventors discovered that, as shown in Figures 1-3 , a flexible circuit board 20 for a display device in the related art may include a main body 1 and a connecting portion 2. The connecting portion 2 is connected to one side of the main body 1 in the second direction Y. A binding area 11 is provided on the other side of the main body 1 in the second direction Y. Specifically, the binding area 11 is provided on the side of the main body 1 opposite the connecting portion 2. The binding area 11 extends along a first direction X, which intersects the second direction Y. For example, the first direction X is perpendicular to the second direction Y. Touch pins 111 are provided on one side of the binding area 11 in the first direction X, and display pins 112 are provided in the middle of the binding area 11. The binding area 11 is used to bind to the display panel 10. A connecting area 21 is provided on the other side of the connecting portion 2 opposite the main body 1. The connecting area 21 is used to accommodate a connector 30, which is used to connect to the main control circuit board 40. As shown in Figure 1 , the flexible circuit board 20 is arranged in an "L" shape. As shown in Figure 2 , the flexible circuit board 20 is arranged in a "T" shape. As shown in Figure 3, the flexible circuit board 20 is basically set to a "T" shape, and the length of the connecting part 2 is greatly shortened. However, in order to lay out the circuit, 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 results in a significant increase in the cost of the flexible circuit board 20.

[0060] As shown in Figure 4, since there are many different types of lines in the figure, the same lines are marked with a double-dotted rectangular frame. 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.

[0061] A touch driver chip is disposed in the first device area 15 on the other side of the flexible circuit board 20 in the first direction X. The touch trace 12 needs to be connected from one side of the binding area 11 in the first direction X 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. This inevitably causes the touch trace 12 to intersect with 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, which will interfere with the touch trace 12, thereby easily interfering with the touch signal and generating noise.

[0062] 5 to 10 , the flexible circuit board 20 is used to connect a display panel 10 and a connector 30. The flexible circuit board 20 may include a main body 1 and a connecting portion 2. The main body 1 has a binding area 11 for binding to the display panel 10. The binding area 11 is located at an edge of the main body 1 in a second direction Y and extends along a first direction X, where the second direction Y intersects the first direction X. The main body 1 is provided with a touch trace 12 and other traces 13. The touch trace 12 is at least provided at an edge of the main body 1 away from the binding area 11. The connecting portion 2 is connected to the main body 1 and is located in an area between the touch trace 12 and the binding area 11. At least a portion of the other traces 13 extends from the connecting portion 2 to the binding area 11 so that the touch trace 12 and the other traces 13 do not intersect. The connecting portion 2 can be bent relative to the main body 1 and has a connecting area 21 for connecting to the connector 30.

[0063] In the flexible circuit board 20 disclosed herein, on one hand, the touch trace 12 is provided at least in an edge region of the main body 1 away from the binding region 11, while the connecting portion 2 is connected to the main body 1 and to the region between the touch trace 12 and the binding region 11. This allows other traces 13 to extend from the connecting region 21 of the connecting portion 2 to the binding region 11 without crossing the touch trace 12. Consequently, the touch trace 12 and other traces 13 do not intersect, thereby ensuring that other signals do not affect the touch signal, thereby reducing noise in the touch signal and ensuring a good touch effect. Furthermore, compared to the "L"-shaped or "T"-shaped flexible circuit boards 20 of the related art, the lack of a longer connecting portion 2 reduces the internal space occupied by the flexible circuit board 20 within the battery 60 device. This allows for the installation of a larger capacity battery 60 within the battery 60 device to improve the battery life of the display device, and also allows for the installation of more heat dissipation material within the display device to improve the heat dissipation performance of the display device.

[0064] In this example embodiment, the flexible circuit board 20 can be used to connect the display panel 10 and the connector 30, so that display signals can be transmitted between the display panel 10 and the connector 30. The flexible circuit board 20 can be configured as a rectangle, where the edges extending along the first direction X can be the long sides of the flexible circuit board 20, and the first direction X can be the length direction of the flexible circuit board 20. The edges extending along the second direction Y can be the short sides of the flexible circuit board 20, and the second direction Y can be the width direction of the flexible circuit board 20.

[0065] 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 sides of the flexible circuit board 20 can be curved.

[0066] Of course, the flexible circuit board 20 can also be configured to have other shapes. For example, the flexible circuit board 20 can also be configured to have a circular shape, an elliptical shape, a trapezoidal shape, or other regular or irregular polygonal shapes.

[0067] Specifically, referring to Figures 5 and 6 , in Figure 6 , due to the large number of traces, identical traces are indicated by a double-dashed rectangular frame. The flexible printed circuit board 20 may include a main body 1 and a connecting portion 2. The main body 1 has a binding region 11. Specifically, the binding region 11 is located at a side edge of the main body 1 in the second direction Y. The binding region 11 is used to bind to the display panel 10. The binding region 11 extends along a first direction X, intersecting the first direction X and 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 region 11 in the first direction X, and a display pin 112 is provided in the middle of the binding region 11.

[0068] As shown in Figure 6, touch lines 12 and other lines 13 are provided on the main body 1. The touch lines 12 are provided at least in the edge area of ​​the main body 1 away from the binding area 11. Specifically, the touch lines 12 are provided 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 lines 12 and the binding area 11 occupy the edge area of ​​the main body 1.

[0069] 5 and 6 , 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 .

[0070] Other traces 13 need to be connected from the binding area 11 to the connector 30 . 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 .

[0071] The touch line 12 is arranged in the edge area of ​​the main body 1, and the connecting part 2 is connected to the main body 1 and connected 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 connection area 21 of the connecting part 2 to the binding area 11, so that the touch line 12 does not cross with 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.

[0072] Moreover, 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.

[0073] In this exemplary embodiment, as shown in FIG6 , the touch trace 12 may include a first portion of touch traces 121 and a second portion of touch traces 122. The first portion of touch traces 121 may include a touch power line, and the second portion of touch traces 122 may include a touch signal line and a shielding line. The second portion of touch traces 122 is located on a side of the first portion of touch traces 121 away from the connection portion 2, i.e., the second portion of touch traces 122 is closer to the edge of the flexible circuit board 20 than the first portion of touch traces 121. One end of the second portion of touch traces 122 is connected to the touch pins 111 of the binding area 11, and the other end of the second portion of touch traces 122 is connected to the touch driver chip of the first device area 15.

[0074] The first portion of touch traces 121 and the other traces 13 exit from the same side of the connector 2. Specifically, they all exit from the portion where the connector 2 connects to the main body 1. Furthermore, the first portion of touch traces 121 and the other traces 13 bend in opposite directions. Specifically, the first portion of touch traces 121 bends toward the side near the second portion of touch traces 122, while the other traces 13 bend toward the center of the flexible circuit board 20. This arrangement allows the touch traces 12 to be almost entirely located within the edge of the flexible circuit board 20, preventing noise from intersecting the touch traces 12 and other traces 13.

[0075] 5 and 6 , the main body 1 has a first end and a second end disposed opposite each other in a first direction X, and the connecting portion 2 is connected to the first end. Furthermore, a fingerprint hole 14 may be provided on the main body 1. The fingerprint hole 14 may be located between the first end and the second end, such that the fingerprint hole 14 is substantially located in the middle portion of the main body 1. A fingerprint recognition sensor is installed at the location of the fingerprint hole 14. When the user uses the fingerprint recognition sensor, they need to press the fingerprint recognition sensor to perform fingerprint recognition.

[0076] The minimum distance 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 distance 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, and so on.

[0077] 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.

[0078] 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 and lightness of the display device.

[0079] The above numerical range not only ensures that when the user presses the fingerprint recognition sensor to realize fingerprint recognition, no pressing force is generated on the connecting part 2, thereby ensuring the connection effect between the connecting 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.

[0080] 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 set in the first device area 15, and the touch trace 12 is connected to the first device area 15. Specifically, the touch trace 12 is connected to the touch driver chip.

[0081] 5 and 6 , a non-enclosed groove 17 is provided on the flexible circuit board 20 , and the groove 17 divides the flexible circuit board 20 into the main body 1 and the connecting portion 2 . The groove 17 may be a through slot that passes through the flexible circuit board 20 .

[0082] 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.

[0083] The first sub-groove 171 extends into a straight line, the second sub-groove 172 extends into a straight line, and the third sub-groove 173 extends into a straight line. Specifically, the first sub-groove 171, the second sub-groove 172, and the third sub-groove 173 extend into a straight line. Alternatively, the first sub-groove 171, the second sub-groove 172, and the third sub-groove 173 can be configured as straight lines. In this case, the groove 17 is substantially U-shaped, and the opening of the U-shaped groove 17 faces the binding area 11.

[0084] Of course, in other exemplary embodiments of the present disclosure, as shown in FIG7 , 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. Specifically, the first sub-groove 171, the second sub-groove 172, and the third sub-groove 173 can be configured as curved grooves, i.e., the first sub-groove 171, the second sub-groove 172, and the third sub-groove 173 extend into a curved shape. Furthermore, the opening of the "U"-shaped groove 17 can also face opposite sides of the first direction X, i.e., the groove 17 in FIG5 can be rotated 90 degrees clockwise or counterclockwise. Of course, the groove 17 in FIG5 can also be rotated clockwise or counterclockwise by a set angle, which can be set as needed.

[0085] In 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.

[0086] 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 not only have the two relative side walls of the first sub-groove 171, the second sub-groove 172 and the third sub-groove 173 extending along the extension direction set as curved side walls, but also can have 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 set as a curved side wall.

[0087] 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.

[0088] 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 1.

[0089] 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 much area of ​​the flexible circuit board 20, which is not conducive to the layout of the flexible circuit board 20.

[0090] 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.

[0091] In some other example embodiments of the present disclosure, the groove 17 can be a blind groove that does not penetrate the flexible circuit board 20. Specifically, the groove 17 can penetrate at least one conductive functional layer of the flexible circuit board 20, and the penetrated conductive functional layer is peeled off from other parts of the flexible circuit board 20 to form a connecting portion 2.

[0092] In the above case, the connection part 2 and the main body 1 are formed as an integrally formed flexible circuit board 20 , and then the groove 17 is formed on the flexible circuit board 20 to divide the flexible circuit board 20 into the interconnected connection part 2 and the main body 1 .

[0093] 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.

[0094] 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 can 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 so on.

[0095] 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.

[0096] If the ratio of the length of the connecting portion 2 to the length of the main body 1 is too large, the connecting portion 2 will be too long, occupying a large space on the flexible circuit board 20, which is not conducive to improving the space utilization rate of the flexible circuit board 20; and the connecting portion 2 will have a large margin after being bent, making the connecting portion 2 prone to shaking, which may easily cause poor reliability of the entire display device.

[0097] The above numerical range not only ensures that the connecting portion 2 can be bent smoothly without generating bending stress or pulling force after bending, but also ensures that the space utilization of the flexible circuit board 20 is improved by not occupying a large amount of space. The connecting portion 2 is also less likely to wobble after bending, which would not affect the reliability of the display device. In other words, the shorter the length of the connecting portion 2, the better, as long as it meets the bending and snapping requirements.

[0098] 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 integral structure through a connecting member. In this case, the main body portion 1 is an integral structure.

[0099] In some other example embodiments of the present disclosure, as shown in Figure 8, a groove 17 or a through hole can be provided on the flexible circuit board 20, and the connecting portion 2 and the main body portion 1 can be formed separately, and then the connecting portion 2 is connected to the main body portion 1 through a connecting member, and is connected to one side edge of the groove 17 or the through hole, so that the connecting portion 2 and the main body portion 1 are connected as an integrated structure.

[0100] In this example embodiment, as shown in Figure 6, the flexible circuit board 20 may further include a first grounding wire 181, which is arranged around the edge of the groove 17, that is, the first grounding wire 181 is provided on the edge of the groove 17 close to the connecting portion 2 and the edge away from the connecting portion 2, so that the first grounding wire 181 is arranged to surround the groove 17 for at least one circle. The first grounding wire 181 can be used to shield and isolate the signal on the connecting portion 2 from the signal on the main body 1 to avoid noise generated between them due to the close distance.

[0101] 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 set 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 due to their close distance.

[0102] 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 third grounding line 183 can shield and isolate the touch signal from the signal on the main body 1 to avoid noise generation due to the close distance.

[0103] 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. Furthermore, the entire first grounding wire 181 can be arranged on the same conductive layer of the flexible circuit board 20. In the event of interference with other adjacent conductive wires, a portion of the first grounding wire 181 can be arranged on one conductive layer of the flexible circuit board 20, while another portion of the first grounding wire 181 can be arranged on another conductive layer of the flexible circuit board 20. The two portions can be connected via vias provided in the insulating layer.

[0104] Similarly, the entire second grounding line 182 can be disposed on the same conductive layer of the flexible circuit board 20. If there is interference with other adjacent conductive lines, a portion of the second grounding line 182 can be disposed on one conductive layer of the flexible circuit board 20, while another portion of the second grounding line 182 can be disposed on another conductive layer of the flexible circuit board 20, and the two portions can be connected via vias disposed in the insulating layer. The entire third grounding line 183 can be disposed on the same conductive layer of the flexible circuit board 20. If there is interference with other adjacent conductive lines, a portion of the third grounding line 183 can be disposed on one conductive layer of the flexible circuit board 20, while another portion of the third grounding line 183 can be disposed on another conductive layer of the flexible circuit board 20, and the two portions can be connected via vias disposed in the insulating layer.

[0105] In this example embodiment, referring to Figure 6, 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.

[0106] 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.

[0107] Compared to structures using related art, the length of display power line 131 in the present disclosure is shortened by 70% to 80%. Specifically, the ratio of the length of display power line 131 in the present disclosure to the length of display power line 131 in related art is greater than or equal to 0.2 and less than or equal to 0.3. The reduced length of display power line 131 reduces its resistance. Since the width of display power line 131 is inversely proportional to its resistance, the width of display power line 131 can be reduced while maintaining its resistance, thereby improving the space utilization of flexible circuit board 20.

[0108] In this exemplary embodiment, as shown in FIG6 , a portion of the display signal lines 132 is configured as a serpentine structure. The resistance of multiple display signal lines 132 is generally required to be substantially the same, so the length and width of the multiple display signal lines 132 are required to be substantially the same. However, because the display signal lines 132 are curved rather than straight lines, the display signal lines 132 located on the inner side of the bend are shorter, while the display signal lines 132 located on the outer side of the bend are longer. Configuring a portion of the display signal lines 132 as a serpentine structure can increase the length of the display signal lines 132. Furthermore, the display signal lines 132 on the inner side of the bend have a greater number of serpentine structures than the display signal lines 132 on the outer side of the bend.

[0109] A shielding line is provided between two adjacent display signal lines 132 , and the display signals between the two adjacent display signal lines 132 are isolated by the shielding line.

[0110] The flexible circuit board 20 can be a two-layer board, that is, it can include two conductive layers. Specifically, the flexible circuit board 20 can include a base layer, a first conductive layer, a second conductive layer, a first cover layer, and a second cover layer. The first conductive layer and the second conductive layer are arranged on opposite sides of the base layer, the first cover layer is arranged on the side of the first conductive layer facing away from the base layer, and the second cover layer is arranged on the side of the second conductive layer facing away from the base layer. Various conductors are arranged in the first and second conductive layers. In Figures 4 and 6, the conductors in different conductive layers are represented by different line types. Compared to the related art shown in Figure 3, which configures the flexible circuit board 20 as a combination of a two-layer board and a three-layer board, the cost is reduced by approximately 20% while the area of ​​the flexible circuit board 20 remains the same.

[0111] Based on the same inventive concept, an example embodiment of the present disclosure provides a display device, as shown in Figure 11, 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.

[0112] 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 , and the like stacked in sequence.

[0113] 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. The outer side surface of the cover 106 can be the display surface.

[0114] The specific structure of the flexible circuit board 20 has been described in detail above and will not be repeated here. The flexible circuit board 20 is bonded to the display panel 10. Specifically, the bonding area 11 of the flexible circuit board 20 is bonded to the display panel 10. Furthermore, the flexible circuit board 20 can be bent to the non-display side of the display panel 10, opposite the display surface.

[0115] The connecting portion 2 of the flexible circuit board 20 can be bent toward the side away from the display panel 10. Specifically, the connecting portion 2 is first bent toward the side away from the display panel 10 at a bending angle of approximately 90 degrees; the end of the connecting portion 2 away from the display panel 10 is then bent toward the side close to the binding area.

[0116] 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.

[0117] The main control circuit board 40 is electrically connected to the connector 30 . Specifically, a connector that matches the connector 30 is provided 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 .

[0118] In this example embodiment, as shown in FIG. 9 , the flexible circuit board 20 has a device region 15 a. The device region 15 a may include a first device region 15 and a second device region 16. Components are disposed in the device region 15 a, i.e., components are disposed in the first device region 15 and the second device region 16. The components are located on a side of the flexible circuit board 20 facing away from the display panel 10. Since the components are subject to push-pull forces and other reliability requirements, it is usually necessary to perform glue dispensing on at least some of the components, i.e., to cover the components with a glue layer 70. After the glue dispensing is completed, high-temperature curing is usually required. After curing, the glue surface of the glue layer 70 will shrink to a certain extent. In addition, a certain amount of pressure is required when punching the flexible circuit board 20, which may cause a local "micro-convexity" of the flexible circuit board 20. This is manifested as poor mold printing in the display device after bonding with the display panel 10. The poor mold printing is mainly manifested as deformation of the adhesive layer 105.

[0119] In this example embodiment, referring to Figures 10 and 11, the display device may further include an adhesive layer 50, which may be a double-sided tape. The adhesive layer 50 is provided between the flexible circuit board 20 and the non-display surface of the display panel 10, and the flexible circuit board 20 is adhered to the non-display surface of the display panel 10 through the adhesive layer 50.

[0120] Poor stenciling can be alleviated by partially isolating 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.

[0121] Specifically, when the flexible circuit board 20 can have a first device area 15 and a second device area 16, the first device area 15 and the second device area 16 can be located on opposite sides of the fingerprint through-hole 14 in the first direction X. The orthographic projection of the adhesive layer 50 on the display panel 10 does not overlap with either the first device area 15 or the second device area 16. That is, the adhesive layer 50 is not provided in either the first device area 15 or the second device area 16. This allows a gap to be provided between the display panel 10 and the first device area 15 and the second device area 16. This ensures that the pressure exerted by the flexible circuit board 20 on the display panel 10 in the first device area 15 and the second device area 16 is zero, thereby avoiding the formation of mold marks. Furthermore, for process convenience, the areas without the adhesive layer 50 can be connected as a whole, so that the areas without the adhesive layer 50 are larger than the first device area 15 and the second device area 16.

[0122] 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.

[0123] In other exemplary embodiments of the present disclosure, mold defects can be alleviated by increasing the strength of the display panel 10. Specifically, the adhesive layer 105 between the cover plate 106 and the polarizer 104 can be made of an optically clear adhesive (OCA). The adhesive layer 105 has a high elastic modulus. 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.

[0124] The elastic modulus can be considered a measure of how easily a material undergoes elastic deformation. The higher the value, the greater the stress required to produce a given elastic deformation. In other words, the stiffer the material, the less elastic deformation it undergoes under a given stress. Creep is the phenomenon in which the strain of a solid material increases over time while maintaining a constant stress.

[0125] 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.

[0126] In addition, the thickness of the back film 102 can be set to be relatively thick. 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. Setting the thickness of the back film 102 relatively thick reduces the pressure transmitted to the adhesive layer 105, thereby reducing mold printing defects.

[0127] Furthermore, heat dissipation film 101 may include rolled copper foil. Rolled copper foil is a product (typically 4-100 microns thick and less than 800 mm wide) made by repeatedly rolling and annealing high-precision copper strip (typically less than 150 microns thick) using the principles of plastic working. Its ductility, bending resistance, and electrical conductivity are superior to those of electrolytic copper foil. Rolled copper foil has a higher elastic modulus, which can isolate pressure from components, preventing it from being transferred to adhesive layer 105, thereby reducing stencil defects.

[0128] In addition, 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 molding.

[0129] In addition, it should be noted that the above-mentioned embodiments for increasing the strength of the display panel 10 can be used alone or in combination, and will not be described one by one here.

[0130] In some further exemplary embodiments of the present disclosure, stencil printing defects can be mitigated by increasing the strength of the flexible circuit board 20 itself. Specifically, when the flexible circuit board 20 has a device region 15a, the display device can further include a reinforcement portion. The reinforcement portion can be provided on the side of the flexible circuit board 20 where no components are provided. The reinforcement portion can isolate the pressure of the components, making it less likely to be transmitted to the adhesive layer 105, thereby mitigating stencil printing defects.

[0131] Of course, the reinforcement portion can be provided 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.

[0132] In addition, it should be noted that the above-mentioned embodiments for increasing the strength of the flexible circuit board 20 can be used alone or in combination, and will not be described one by one here.

[0133] Moreover, the orthographic projection of the device area 15a on the display panel 10 overlaps with the orthographic projection of the reinforcement portion 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 portion 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 portion on the display panel 10, or the orthographic projection of the reinforcement portion 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 portion on the display panel 10.

[0134] 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 larger capacity battery can be provided inside the display device to improve the battery life 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.

[0135] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A flexible circuit board for connecting a display panel and a connector, wherein: 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 the main body portion in a second direction and extending along a first direction, the second direction intersecting the first direction, the main body portion being provided with touch lines and other lines, the touch lines 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, wherein 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, wherein: The main body has a first end and a second end oppositely arranged 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.

4. The flexible circuit board according to claim 3, wherein: 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, wherein: The main body further has a first device region, which is located at the second end. A touch driver chip is provided in the first device region, and the touch trace is connected to the first device region.

6. The flexible circuit board according to any one of claims 1 to 5, wherein: A non-enclosed groove is provided on the flexible circuit board, and the groove divides the flexible circuit board into the main body portion and the connecting portion.

7. The flexible circuit board according to claim 6, wherein: 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, wherein: The groove is a through groove that passes through the flexible circuit board.

9. The flexible circuit board according to claim 6, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: The flexible circuit board is a two-layer board.

15. A display device, wherein: include: Display panel; 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, wherein 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, 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.

17. The display device according to claim 15, wherein: Components are provided on a side of the flexible circuit board facing 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 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 0.2 MPa and less than or equal to 0.25 MPa, 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 includes rolled copper foil; The heat dissipation film includes a silica gel layer or a foam layer.

18. The display device according to claim 15, wherein 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 provided on a side of the flexible circuit board where no components are provided, or is provided 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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