Flexible circuit board and display device

Abstract

The invention provides a flexible circuit board and a display device, and the flexible circuit board comprises a conductive layer which comprises at least one wire, the wire comprises a first conductive part and a second conductive part which can move relatively, a connecting part is arranged between the first conductive part and the second conductive part, and the first conductive part and the second conductive part are electrically connected through the connecting part; the flexible base layer is arranged on at least one side of the conductive layer in the first direction, and the first conductive part and the second conductive part are connected with the flexible base layer. According to the flexible circuit board and the display device provided by the invention, when the flexible circuit board is subjected to the acting force, the first conductive part and the second conductive part can relatively move under the driving of the acting force, so that the flexible circuit board is twisted and swung within a certain range, and the flexible circuit board releases at least part of the acting force; therefore, the warping phenomenon of the flexible circuit board is reduced or even eliminated.

Description

Technical Field

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

[0002] In a display device, in order to achieve signal transmission between two functional modules that are separated from each other, a flexible printed circuit (FPC) may be used to electrically connect the two functional modules.

[0003] Flexible circuit boards are made of flexible substrates (such as polyimide or polyester film) and are highly reliable and extremely flexible. Compared with traditional rigid circuit boards, flexible circuit boards can adapt to the requirements of complex curved surfaces and narrow spaces due to their flexibility and bendability. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a flexible circuit board and a display device.

[0005] Based on the above-mentioned purpose, the first aspect of the present application provides a flexible circuit board, including: a conductive layer, including at least one trace, the trace including a first conductive part and a second conductive part that can move relatively, a connecting part is arranged between the first conductive part and the second conductive part, and the first conductive part and the second conductive part maintain electrical connection through the connecting part; a flexible base layer, arranged on at least one side of the conductive layer along a first direction, and the first conductive part and the second conductive part are respectively connected to the flexible base layer.

[0006] Based on the same inventive concept, the second aspect of the present application further provides a display device, comprising the flexible circuit board as described in the first aspect.

[0007] From the above description, it can be seen that the flexible circuit board and display device provided by the present application, the wiring arranged on the conductive layer includes a first conductive part, a second conductive part, and a connecting part located therebetween; when the flexible circuit board is subjected to an action force, the first conductive part and the second conductive part can move relative to each other under the driving force, thereby causing the flexible circuit board to twist and swing within a certain range. Even if the connection method at both ends of the flexible circuit board is a rigid connection, after the flexible circuit board is twisted and swung, the flexible circuit board can release at least part of the action force, thereby reducing or even eliminating the phenomenon of warping of the flexible circuit board.

[0008] At the same time, since the first conductive part and the second conductive part can maintain electrical connection through the connecting part, even if the first conductive part and the second conductive part move relative to each other, the signal can be transmitted between the first conductive part and the second conductive part with the help of the connecting part to prevent transmission interruption in the routing, which helps to ensure the transmission reliability of the flexible circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] To more clearly illustrate the technical solutions in the present application or related technologies, the following will briefly introduce the drawings required in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0010] Figure 1 Schematic diagram of the flexible circuit board according to the embodiment of the present application;

[0011] Figure 2 Partial top-down view schematic diagram of the flexible circuit board according to the embodiment of the present application after removing the top substrate and with the traces in a natural state;

[0012] Figure 3 Enlarged schematic diagram of the compression mechanism of the flexible circuit board according to the embodiment of the present application;

[0013] Figure 4 For Figure 2 Schematic diagram of the cross-section taken along line A-A in

[0014] Figure 5 Partial top-down view schematic diagram of the flexible circuit board according to the embodiment of the present application with the traces in a compressed state;

[0015] Figure 6 For Figure 5 Schematic diagram of the cross-section taken along line B-B in

[0016] Figure 7 Enlarged schematic diagram of the stretching mechanism of the first structure of the flexible circuit board according to the embodiment of the present application;

[0017] Figure 8 Partial top-down view schematic diagram of the flexible circuit board according to the embodiment of the present application with the traces in a tensioned state;

[0018] Fig. 9 For Figure 8 Schematic diagram of the cross-section taken along line D-D in

[0019] Fig.10 Enlarged schematic diagram of the stretching mechanism of the second structure of the flexible circuit board according to the embodiment of the present application;

[0020] Fig.11 Partial schematic diagram of the flexible circuit board according to the embodiment of the present application with another structure and with the traces in a natural state;

[0021] Fig.12 Partial schematic diagram of the flexible circuit board according to the embodiment of the present application with another structure and with the traces under the action of a force. Detailed implementation manners

[0022] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0023] It should be noted that the relative arrangement of the components, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

[0024] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0025] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0026] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] In some embodiments, a mobile terminal (e.g., a mobile phone) includes an OLED touch display panel (hereinafter referred to as the display panel), and the display panel may be provided with an ultrasonic fingerprint module so that fingerprint recognition can be performed even when the display panel is not luminous, thereby meeting user needs.

[0028] In order to improve the comfort of fingerprint unlocking of the user's handheld mobile terminal, the ultrasonic fingerprint module is set at a long distance from the main flexible circuit board (MFPC) in the display panel, so a long flexible circuit board 1000 (FPC) is required between the ultrasonic fingerprint module and the main flexible circuit board for connection. The flexible circuit board 1000 is used to transmit communication signals, control signals or power supply between the ultrasonic fingerprint module and the main flexible circuit board.

[0029] In some embodiments, Figure 1One end of the flexible circuit board 1000 has a binding area 1100, and the binding area 1100 is provided with a conductive adhesive layer. The flexible circuit board 1000 is connected to the ultrasonic fingerprint module through the conductive adhesive layer, that is, the two are connected by conductive adhesive bonding (ACF bonding). The other end of the flexible circuit board 1000 is connected to the main flexible circuit board through a zero insertion force connection component 1200. Exemplarily, the zero insertion force (ZIF) connection component includes a ZIF gold finger and a ZIF connector that can be plugged into each other, one of the ZIF gold finger and the ZIF connector is provided on the flexible circuit board 1000, and the other is provided on the main flexible circuit board.

[0030] When assembling the display panel, the flexible circuit board 1000 is first bound to the ultrasonic fingerprint module. After the ultrasonic fingerprint module is attached to the preset structural layer in the display panel, the flexible circuit board 1000 is plugged into the main flexible circuit board. Since there is a certain position accuracy tolerance when the ultrasonic fingerprint module is attached, the flexible circuit board 1000 may be twisted and deformed after being plugged into the main flexible circuit board, resulting in local deformation of the flexible circuit board 1000 (for example, Figure 1 The warped flexible circuit board 1000 occupies the safety space between the display panel and the battery compartment of the mobile terminal, posing a potential safety hazard to the mobile terminal.

[0031] The applicant has found that the reason why the flexible circuit board 1000 warps is that after the ultrasonic fingerprint module rotates along the plane direction of the bonding surface, a certain force is generated on the flexible circuit board 1000. At the same time, since the connection between the flexible circuit board 1000 and the ultrasonic fingerprint module and the main flexible circuit board is a rigid connection, the force generated by the above rotation cannot be released on the flexible circuit board 1000, resulting in extrusion deformation of the flexible circuit board 1000, and then warping along its thickness direction.

[0032] Based on the above reasons, if the flexible circuit board 1000 can absorb or release the above forces, the warping of the flexible circuit board 1000 can be reduced or even eliminated.

[0033] In view of this, if Figure 2 and Figure 4 The embodiment of the present application provides a flexible circuit board 1000, including: a conductive layer 1300, including at least one trace 1310, the trace 1310 including a first conductive portion 1311 and a second conductive portion 1312 that can move relatively, a connecting portion 1313 is provided between the first conductive portion 1311 and the second conductive portion 1312, and the first conductive portion 1311 and the second conductive portion 1312 are electrically connected through the connecting portion 1313; a flexible base layer 1400, along a first direction (for example, Figure 4The first conductive portion 1311 and the second conductive portion 1312 are respectively connected to the flexible base layer 1400 .

[0034] Exemplarily, the flexible base layer 1400 may be a flexible structural layer formed of an insulating material.

[0035] Exemplarily, the first conductive part 1311 and the connecting part 1313, as well as the second conductive part 1312 and the connecting part 1313, can be connected by sliding contact, that is, during the relative movement of the first conductive part 1311 and the second conductive part 1312, the first conductive part 1311 and the second conductive part 1312 are always in contact with the connecting part 1313, respectively, so that the first conductive part 1311 and the second conductive part 1312 can be electrically connected through the connecting part 1313. Alternatively, the connecting part 1313 includes two structural members that can move relatively, one of which is fixedly connected to the first conductive part 1311, and the other is fixedly connected to the second conductive part 1312, and the two structural members are connected by sliding contact, so that the first conductive part 1311 and the second conductive part 1312 can be electrically connected through the connecting part 1313.

[0036] Exemplarily, the first conductive portion 1311 and the second conductive portion 1312 may be spaced apart along the extension direction of the trace 1310 , or may be spaced apart along the width direction of the trace 1310 , or may be spaced apart along the thickness direction of the trace 1310 .

[0037] Exemplarily, the trace 1310 may include a plurality of first conductive portions 1311 and a plurality of second conductive portions 1312 .

[0038] Exemplarily, the first conductive portion 1311 and the second conductive portion 1312 may be connected to the same flexible substrate 1400 , or may be connected to different flexible substrates 1400 , respectively.

[0039] Exemplarily, the first conductive portion 1311, the second conductive portion 1312 and the connecting portion 1313 may be arranged at Figure 1 The dotted line frame in the figure is located at the position, or multiple groups are arranged along the extending direction of the flexible circuit board 1000.

[0040] When the flexible circuit board 1000 of this embodiment is subjected to a force, the first conductive portion 1311 and the second conductive portion 1312 can move relatively under the drive of this force, thereby releasing at least part of the force to improve the problem that the flexible circuit board 1000 warps due to the above-mentioned force. At the same time, since the first conductive portion 1311 and the second conductive portion 1312 can maintain electrical connection through the connecting portion 1313, even if the first conductive portion 1311 and the second conductive portion 1312 move relatively, signals can still be smoothly transmitted between the first conductive portion 1311 and the second conductive portion 1312 through the connecting portion 1313.

[0041] It should be noted that when the flexible circuit board 1000 is subjected to a force, the flexible base layer 1400 can be bent, compressed or stretched under the drive of this force. Therefore, the flexible base layer 1400 will not hinder the relative movement of the first conductive portion 1311 and the second conductive portion 1312.

[0042] In the flexible circuit board 1000 provided in this embodiment, the trace 1310 provided on the conductive layer 1300 includes a first conductive portion 1311, a second conductive portion 1312, and a connecting portion 1313 located therebetween; when the flexible circuit board 1000 is subjected to a force, the first conductive portion 1311 and the second conductive portion 1312 can move relatively under the drive of this force, so that the flexible circuit board 1000 can twist and swing within a certain range. Even if the connection methods at both ends of the flexible circuit board 1000 are rigid connections, after the flexible circuit board 1000 twists and swings, at least part of the force can be released from the flexible circuit board 1000, thereby reducing or even eliminating the warping phenomenon of the flexible circuit board 1000.

[0043] At the same time, since the first conductive portion 1311 and the second conductive portion 1312 can maintain electrical connection through the connecting portion 1313, even if the first conductive portion 1311 and the second conductive portion 1312 move relatively, signals can also be transmitted between the first conductive portion 1311 and the second conductive portion 1312 by means of the connecting portion 1313 to prevent the trace 1310 from experiencing a transmission interruption phenomenon, which helps to ensure the transmission reliability of the flexible circuit board 1000.

[0044] The applicant's research found that the forces acting on the flexible circuit board 1000 include compressive forces and / or tensile forces. If the first conductive portion 1311 and the second conductive portion 1312 can move relatively under the drive of the compressive force, then when the flexible circuit board 1000 is subjected to a compressive force, at least part of the compressive force can be released through their relative movement to improve the problem of warping of the flexible circuit board 1000.

[0045] Similarly, if the first conductive portion 1311 and the second conductive portion 1312 can move relative to each other under the driving force of the tensile force, then when the flexible circuit board 1000 is subjected to the tensile force, at least part of the tensile force can be released through the relative movement of the two, and the warping problem of the flexible circuit board 1000 can also be improved.

[0046] The above two situations are further explained below.

[0047] like Figure 2 , Figure 3 , Figure 4 and Figure 5 In some embodiments, the first conductive portion 1311 and the connecting portion 1313 are arranged along the second direction (eg Figure 2 The first conductive portion 1311 and the connecting portion 1313 are spaced apart from each other in the X direction in the figure, and a compression mechanism 1314 is provided between the first conductive portion 1311 and the connecting portion 1313; the routing 1310 has a natural state and a compressed state. When the routing 1310 is in the natural state, the compression mechanism 1314 is locked to prevent the first conductive portion 1311 and the connecting portion 1313 from moving away from each other; when the routing 1310 is in the compressed state, the compression mechanism 1314 is unlocked, and the first conductive portion 1311 and the connecting portion 1313 move closer to each other; the second direction is the extension direction of the routing 1310.

[0048] like Figure 2 When the wiring 1310 is in a natural state, the compression mechanism 1314 is locked, and the first conductive portion 1311 and the connecting portion 1313 cannot move away from each other.

[0049] When the flexible circuit board 1000 is subjected to a compressive force (the direction of the compressive force is as follows Figure 3 As shown in F1 in the figure, Figure 5 , the trace 1310 switches to a compressed state. The compression mechanism 1314 is unlocked under the driving force of the compression force, and at the same time, the first conductive part 1311 and the connecting part 1313 are moved closer to each other under the driving force of the compression force. After the first conductive part 1311 moves, the compression force on the flexible circuit board 1000 can be released, thereby improving the problem of warping of the flexible circuit board 1000.

[0050] In this embodiment, a compression mechanism 1314 is provided between the first conductive portion 1311 and the connecting portion 1313, thereby providing a moving space for the first conductive portion 1311 and the connecting portion 1313 to move closer to each other. When the flexible circuit board 1000 is subjected to a compressive force, it can be ensured that the first conductive portion 1311 and the connecting portion 1313 can release the compressive force by moving closer to each other. At the same time, the compression mechanism 1314 can also limit the relative movement between the first conductive portion 1311 and the connecting portion 1313 to a certain extent, so as to avoid the failure of the electrical connection between the two due to the uncontrolled movement between the two.

[0051] Regarding the specific structure of the compression mechanism 1314, Figure 2 , Figure 3 and Figure 5 In some embodiments, the compression mechanism 1314 includes a first locking arm 13141 and a second locking arm 13142 that are staggered, one end of the first locking arm 13141 is connected to the connecting portion 1313, and one end of the second locking arm 13142 is connected to the first conductive portion 1311; a first protrusion 13143 and a second protrusion 13144 distributed along the second direction are arranged between the first locking arm 13141 and the second locking arm 13142, and the first protrusion 13143 is close to the first conductive portion 1313. 11; the first protrusion 13143 is connected to the first locking arm 13141 and maintains contact with the second locking arm 13142, and the second protrusion 13144 is connected to the second locking arm 13142 and maintains contact with the first locking arm 13141; when the compression mechanism 1314 is locked, the first protrusion 13143 and the second protrusion 13144 abut against each other, the first locking arm 13141 is spaced apart from the first conductive portion 1311 along the second direction, and the second locking arm 13142 is spaced apart from the connecting portion 1313 along the second direction.

[0052] Illustratively, the first locking arm 13141 and the second locking arm 13142 both extend along the second direction.

[0053] Illustratively, the first protrusion 13143 may be close to an end of the first locking arm 13141 away from the connecting portion 1313 , and the second protrusion 13144 may be close to an end of the second locking arm 13142 away from the first conductive portion 1311 .

[0054] Exemplarily, the first protrusion 13143 and the second protrusion 13144 may be rectangular bodies, so that when the first protrusion 13143 and the second protrusion 13144 abut against each other, the two can reliably remain relatively still and prevent slipping.

[0055] by Figure 2 and Figure 3 Taking the structure and direction shown as an example, when the compression mechanism 1314 is locked, the right side wall of the first protrusion 13143 abuts against the left side wall of the second protrusion 13144. At this time, the end of the first locking arm 13141 away from the connecting portion 1313 is spaced from the first conductive portion 1311, and the end of the second locking arm 13142 away from the first conductive portion 1311 is spaced from the connecting portion 1313. The end of the first protrusion 13143 away from the first locking arm 13141 can contact the second locking arm 13142, and similarly, the end of the second protrusion 13144 away from the second locking arm 13142 can contact the first locking arm 13141, so that the first conductive portion 1311 can be electrically connected to the connecting portion 1313 through the compression mechanism 1314.

[0056] by Figure 5Taking the structure and direction shown in the figure as an example, after the compression mechanism 1314 is unlocked, the first protrusion 13143 and the second protrusion 13144 are separated from each other. The connecting portion 1313, the first locking arm 13141 and the first protrusion 13143 can move to the left until they abut against the first conductive portion 1311; the first conductive portion 1311, the second locking arm 13142 and the second protrusion 13144 can move to the right until they abut against the connecting portion 1313, that is, the first conductive portion 1311 and the connecting portion 1313 are close to each other.

[0057] In this embodiment, when the first protrusion 13143 connected to the first locking arm 13141 and the second protrusion 13144 connected to the second locking arm 13142 are in contact, the compression mechanism 1314 is locked, which can prevent the first conductive part 1311 and the connecting part 1313 from being separated from each other, and ensure that the first conductive part 1311 and the connecting part 1313 are electrically connected. When the first protrusion 13143 and the second protrusion 13144 are separated, the compression mechanism 1314 is unlocked. Since the first protrusion 13143 moves along the second locking arm 13142 and keeps in contact with the second locking arm 13142 during the movement, it can be ensured that the first conductive part 1311 and the connecting part 1313 are electrically connected. Similarly, the second protrusion 13144 moves along the first locking arm 13141 and keeps in contact with the first locking arm 13141 during the movement, so it can be further ensured that the first conductive part 1311 and the connecting part 1313 are electrically connected.

[0058] like Figure 2 , Figure 7 , Figure 8 and Fig. 9 In some embodiments, the second conductive portion 1312 and the connecting portion 1313 are spaced apart along the second direction, and a stretching mechanism 1315 is provided between the second conductive portion 1312 and the connecting portion 1313; the routing 1310 has a natural state and a tension state, and when the routing 1310 is in the natural state, the stretching mechanism 1315 is locked to prevent the second conductive portion 1312 and the connecting portion 1313 from approaching each other; when the routing 1310 is in the tension state, the stretching mechanism 1315 is unlocked, and the second conductive portion 1312 and the connecting portion 1313 are away from each other.

[0059] like Figure 2 When the wiring 1310 is in a natural state, the stretching mechanism 1315 is locked, and the second conductive portion 1312 and the connecting portion 1313 cannot approach each other.

[0060] When the flexible circuit board 1000 is subjected to a tensile force (the direction of the tensile force is as follows Figure 7 As shown in F2 in the figure, Figure 8, the trace 1310 switches to the tension state. The stretching mechanism 1315 is unlocked under the driving force of the tension, and at the same time, the second conductive part 1312 and the connecting part 1313 are moved away from each other under the driving force of the tension. After the second conductive part 1312 moves, the tension force on the flexible circuit board 1000 can be released, thereby improving the problem of warping of the flexible circuit board 1000.

[0061] In this embodiment, a stretching mechanism 1315 is provided between the second conductive portion 1312 and the connecting portion 1313, thereby providing a moving space for the second conductive portion 1312 and the connecting portion 1313 to move away from each other. When the flexible circuit board 1000 is subjected to a tensile force, it can be ensured that the second conductive portion 1312 and the connecting portion 1313 can release the tensile force by moving away from each other. At the same time, the stretching mechanism 1315 can also limit the relative movement between the second conductive portion 1312 and the connecting portion 1313 to a certain extent, so as to avoid the electrical connection between the two from failing due to uncontrolled movement between the two.

[0062] Regarding the specific structure of the stretching mechanism 1315, Figure 2 , Figure 7 and Figure 8 In some embodiments, the stretching mechanism 1315 includes a third locking arm 13151 and a fourth locking arm 13152 that are staggered, one end of the third locking arm 13151 is connected to the connecting portion 1313, and one end of the fourth locking arm 13152 is connected to the second conductive portion 1312; a third protrusion 13153 and a fourth protrusion 13154 distributed along the second direction are arranged between the third locking arm 13151 and the fourth locking arm 13152, and the third protrusion 13153 is close to the second conductive portion 1312. Conductive portion 1312; the third protrusion 13153 is connected to the third locking arm 13151 and maintains contact with the fourth locking arm 13152, and the fourth protrusion 13154 is connected to the fourth locking arm 13152 and maintains contact with the third locking arm 13151; when the stretching mechanism 1315 is locked, the third protrusion 13153 and the fourth protrusion 13154 are spaced apart, the third locking arm 13151 is spaced apart from the second conductive portion 1312, and the fourth locking arm 13152 abuts against the connecting portion 1313.

[0063] Illustratively, the third locking arm 13151 and the fourth locking arm 13152 both extend along the second direction.

[0064] Illustratively, the third protrusion 13153 may be close to an end of the third locking arm 13151 away from the connecting portion 1313 , and the fourth protrusion 13154 may be close to an end of the fourth locking arm 13152 away from the second conductive portion 1312 .

[0065] Exemplarily, the third protrusion 13153 and the fourth protrusion 13154 may be rectangular bodies, so that when the third protrusion 13153 and the fourth protrusion 13154 abut against each other, the two can be reliably kept relatively still to prevent slipping.

[0066] by Figure 2 and Figure 7 Taking the structure and direction shown as an example, when the stretching mechanism 1315 is locked, the third protrusion 13153 and the fourth protrusion 13154 are separated from each other, the end of the fourth locking arm 13152 away from the second conductive part 1312 abuts against the connecting part 1313, and the end of the third locking arm 13151 away from the connecting part 1313 is spaced from the second conductive part 1312. The end of the third protrusion 13153 away from the third locking arm 13151 can contact the fourth locking arm 13152, and similarly, the end of the fourth protrusion 13154 away from the fourth locking arm 13152 can contact the third locking arm 13151, so that the second conductive part 1312 can be electrically connected to the connecting part 1313 through the stretching mechanism 1315.

[0067] by Figure 8 Taking the structure and direction shown as an example, after the stretching mechanism 1315 is unlocked, the fourth locking arm 13152 is separated from the connecting portion 1313. The connecting portion 1313, the third locking arm 13151 and the third protrusion 13153 can move to the left until the third protrusion 13153 and the fourth protrusion 13154 abut against each other; the second conductive portion 1312, the fourth locking arm 13152 and the fourth protrusion 13154 can move to the right until the third protrusion 13153 and the fourth protrusion 13154 abut against each other, that is, the second conductive portion 1312 and the connecting portion 1313 are separated from each other.

[0068] In this embodiment, when the fourth locking arm 13152 and the connecting portion 1313 are in contact, the stretching mechanism 1315 is locked, and when the two are separated, the stretching mechanism 1315 is unlocked. Since the third protrusion 13153 moves along the fourth locking arm 13152 and keeps in contact with the fourth locking arm 13152 during the movement, it is possible to ensure that the second conductive portion 1312 and the connecting portion 1313 are electrically connected. Similarly, the fourth protrusion 13154 moves along the third locking arm 13151 and keeps in contact with the third locking arm 13151 during the movement, so it is possible to further ensure that the second conductive portion 1312 and the connecting portion 1313 are electrically connected. When the second conductive part 1312 and the connecting part 1313 move relative to each other until the third protrusion 13153 and the fourth protrusion 13154 abut against each other, the third protrusion 13153 and the fourth protrusion 13154 limit the second conductive part 1312 and the connecting part 1313 to prevent separation from each other, thereby ensuring that the second conductive part 1312 and the connecting part 1313 are electrically connected.

[0069] In addition to the above-mentioned method, the stretching mechanism 1315 can also be locked in another way, such as Fig.10 In some embodiments, when the stretching mechanism 1315 is locked, the third protrusion 13153 and the fourth protrusion 13154 are spaced apart, the third locking arm 13151 abuts against the second conductive portion 1312 , and the fourth locking arm 13152 is spaced apart from the connecting portion 1313 .

[0070] by Fig.10 The structure and direction shown are used as an example for explanation. When the stretching mechanism 1315 is locked, the third protrusion 13153 and the fourth protrusion 13154 are separated from each other, the end of the third locking arm 13151 away from the connecting portion 1313 abuts against the second conductive portion 1312, and the end of the fourth locking arm 13152 away from the second conductive portion 1312 is spaced from the connecting portion 1313. The beneficial effects of the stretching mechanism 1315 in this embodiment are the same as those of the stretching mechanism 1315 in the aforementioned embodiment, and are not described in detail here.

[0071] like Figure 4 In some embodiments, at least two conductive layers 1300 are stacked, and the flexible base layer 1400 is at least disposed between two adjacent conductive layers 1300 .

[0072] Illustratively, the conductive layers 1300 are stacked along the first direction.

[0073] Exemplarily, the flexible base layer 1400 may be disposed above the uppermost conductive layer 1300 and below the lowermost conductive layer 1300 in addition to being disposed between two adjacent conductive layers 1300 .

[0074] Providing at least two conductive layers 1300 helps to reduce the impedance of the flexible circuit board 1000 , thereby helping to improve the current transmission efficiency or signal transmission quality of the flexible circuit board 1000 .

[0075] like Figure 2 In some embodiments, the flexible base layer 1400 is provided with a protruding flexible spacer 1500, and the flexible spacer 1500 is provided along a third direction (eg, Figure 2 The third direction, the first direction and the second direction are perpendicular to each other.

[0076] For example, the flexible spacer 1500 may be connected to the flexible base layer 1400 by integral molding or adhesive bonding.

[0077] Exemplarily, the first direction may be a thickness direction of the conductive layer 1300 , and correspondingly, the third direction may be a width direction of the trace 1310 .

[0078] Exemplarily, a flexible base layer 1400 may be disposed above and below each trace 1310 , and a flexible spacer 1500 may be disposed on both sides along the width direction of the trace 1310 .

[0079] The flexible spacer 1500 can provide isolation and protection for the adjacent wiring 1310. At the same time, the flexible spacer 1500 can also cooperate with the flexible base layer 1400 to limit the first conductive part 1311, the second conductive part 1312 and the connecting part 1313 to ensure that the first conductive part 1311 and the second conductive part 1312 can maintain electrical connection through the connecting part 1313 during movement.

[0080] It is understandable that the flexible spacer 1500 may also be bent, compressed or stretched under the compressive force or the tensile force, and thus will not hinder the movement of the first conductive portion 1311 , the second conductive portion 1312 and the connecting portion 1313 .

[0081] like Figure 2 In some embodiments, the conductive layer 1300 includes a plurality of traces 1310 spaced apart along a third direction, and the flexible spacer 1500 is disposed at least between two adjacent traces 1310 .

[0082] The conductive layer 1300 is provided with a plurality of traces 1310 to help reduce the impedance of the flexible circuit board 1000 , thereby helping to improve the current transmission efficiency or signal transmission quality of the flexible circuit board 1000 .

[0083] like Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 8 and Fig. 9 In some embodiments, the routing 1310 has at least one of a compressive state and a tensile state, and a natural state; the material of the flexible spacer 1500 and the flexible base layer 1400 is a shear-thinning non-Newtonian fluid material; when the routing 1310 switches between the natural state and the tensile state, or, when switching between the compressive state and the natural state, the flexible spacer 1500 and the flexible base layer 1400 are used to flow and fill the gap between the first conductive portion 1311, the connecting portion 1313 and the second conductive portion 1312.

[0084] It should be noted that shear-thinning non-Newtonian fluids refer to fluids whose viscosity (and flow resistance) decreases as the shear rate increases. Such fluids are more viscous at low shear rates and become thinner at high shear rates.

[0085] like Figure 2, when the trace 1310 is in a natural state, there are gaps between the first conductive part 1311 and the connecting part 1313, and between the connecting part 1313 and the second conductive part 1312. However, at this time, since the flexible base layer 1400 and the flexible spacer 1500 are not sheared, the shear-thinning non-Newtonian fluid material is in a state of relatively high viscosity and will not flow into the gaps, as Figure 4 .

[0086] As Figure 5 , when the trace 1310 is switched from the natural state to the compressed state, due to the relative movement of the first conductive part 1311 and the connecting part 1313 under pressure, at this time, the flexible base layer 1400 and the flexible spacer 1500 also deform accordingly. Correspondingly, the viscosity of the shear-thinning non-Newtonian fluid material decreases after being sheared, and part of the material slowly flows into the gap between the first conductive part 1311 and the connecting part 1313 (such as at C in Figure 6 ). After the flexible circuit board 1000 stops deforming, since the shear rate it receives gradually decreases to zero, the viscosity will also gradually increase. Eventually, this part of the material stops flowing and is fixed as the state in Figure 6 , so that the flexible circuit board 1000 can maintain the deformed shape, and the flexible base layer 1400 and the flexible spacer 1500 will not generate a large reaction force on the first conductive part 1311 and the connecting part 1313 after deformation, thereby ensuring that the flexible circuit board 1000 and the devices connected thereto (for example, the ultrasonic fingerprint module and the main flexible circuit board) maintain a reliable connection.

[0087] Similarly, as Figure 8 , when the trace 1310 is switched from the natural state to the stretched state, due to the relative movement of the second conductive part 1312 and the connecting part 1313 under tension, at this time, the flexible base layer 1400 and the flexible spacer 1500 also deform accordingly. Correspondingly, the viscosity of the shear-thinning non-Newtonian fluid material decreases after being sheared, and part of the material slowly flows into the gap between the second conductive part 1312 and the connecting part 1313 (such as at E and F in Fig. 9 ). After the flexible circuit board 1000 stops deforming, since the shear rate it receives gradually decreases to zero, the viscosity will also gradually increase. Eventually, this part of the material stops flowing and is fixed as the state in Fig. 9 , so that the flexible circuit board 1000 can maintain the deformed shape, thereby ensuring that the flexible circuit board 1000 and the devices connected thereto (for example, the ultrasonic fingerprint module and the main flexible circuit board) maintain a reliable connection.

[0088] As Figure 2 , in some embodiments, the trace 1310 includes a compression mechanism 1314 and a stretching mechanism 1315, and the compression mechanism 1314 and the stretching mechanism 1315 are arranged in pairs in the trace 1310.

[0089] Exemplarily, at least two pairs of compression mechanisms 1314 and tension mechanisms 1315 may be provided in the routing 1310 .

[0090] In combination with the foregoing, when the flexible circuit board 1000 is subjected to a compressive force, the compression mechanism 1314 is unlocked, and the first conductive portion 1311 and the connecting portion 1313 can move relative to each other to release the compressive force. When the flexible circuit board 1000 is subjected to a tensile force, the tensile mechanism 1315 is unlocked, and the second conductive portion 1312 and the connecting portion 1313 can move relative to each other to release the tensile force. When the compression mechanism 1314 and the tensile mechanism 1315 are arranged in pairs in the trace 1310, whether the flexible circuit board 1000 is subjected to a compressive force or a tensile force, the flexible circuit board 1000 can release it by deformation, thereby reducing or even eliminating the warping phenomenon of the flexible circuit board 1000.

[0091] In some embodiments, the first locking arms 13141 and the second locking arms 13142 are staggered along the first direction or the third direction.

[0092] The first locking arms 13141 and the second locking arms 13142 may be staggered along the width direction of the routing line 1310 or may be staggered along the thickness direction of the routing line 1310 .

[0093] When the first locking arm 13141 and the second locking arm 13142 are staggered in the width direction of the line 1310, the flexible circuit board 1000 is suitable for scenarios where a force may be applied in a planar direction. When the first locking arm 13141 and the second locking arm 13142 are staggered in the thickness direction of the line 1310, the flexible circuit board 1000 is suitable for scenarios where a fold or bend may occur. Based on different usage scenarios, the arrangement of the first locking arm 13141 and the second locking arm 13142 can be adjusted to reduce or even eliminate the phenomenon of warping of the flexible circuit board 1000 under different force conditions.

[0094] In some embodiments, the third locking arm 13151 and the fourth locking arm 13152 are staggered along the first direction or the third direction.

[0095] The beneficial effects brought about by the arrangement of the third locking arm 13151 and the fourth locking arm 13152 are the same as the beneficial effects brought about by the arrangement of the first locking arm 13141 and the second locking arm 13142, and are not repeated here.

[0096] like Fig.11 and Fig.12In some embodiments, the first conductive portion 1311 and the second conductive portion 1312 are spaced apart along the third direction, the connecting portion 1313 includes a first limiting protrusion 13131 connected to the first conductive portion 1311, and at least two side protrusions 13135 respectively arranged on both sides of the first limiting protrusion 13131 along the second direction, and the side protrusions 13135 are connected to the second conductive portion 1312; the first limiting protrusion 13131 includes two outer side walls 13132 arranged opposite to each other along the second direction, and a The end portion 13133 is provided with a receiving groove 13134, and the bottom of the receiving groove 13134 faces the second conductive portion 1312; when the wiring 1310 is in a natural state, at least two side protrusions 13135 are in contact with the corresponding outer side wall 13132; when the wiring 1310 is in a tension state or a compression state, the side protrusion 13135 located on one side of the first limiting protrusion 13131 moves into the receiving groove 13134 and contacts the bottom of the groove, and the side protrusion 13135 located on the other side is separated from the corresponding outer side wall 13132.

[0097] Exemplarily, the first limiting protrusion 13131 can be welded or integrally connected to the first conductive portion 1311 .

[0098] Exemplarily, the side protrusion 13135 can be connected to the second conductive portion 1312 by welding or integral molding.

[0099] by Fig.11 Taking the structure and direction shown as an example, when the routing 1310 is in a natural state, the two side protrusions 13135 are respectively located on the left and right sides of the first limiting protrusion 13131, and are respectively in contact with the adjacent outer side walls 13132, thereby ensuring that the first conductive part 1311 connected to the first limiting protrusion 13131 and the second conductive part 1312 connected to the side protrusion 13135 are electrically connected.

[0100] When the flexible circuit board 1000 is subjected to a force (compression force or tension force), Fig.12 Taking the structure and direction shown as an example, under the driving force, the first conductive part 1311 moves to the left and the second conductive part 1312 moves to the right, that is, the first conductive part 1311 and the second conductive part 1312 move relative to each other, so that the flexible circuit board 1000 can release the force.

[0101] Meanwhile, the two side protrusions 13135 and the second conductive part 1312 move together: the left side protrusion 13135 moves along the outer side wall 13132 into the receiving groove 13134 of the end part 13133. The side protrusion 13135 located in the receiving groove 13134 can contact the bottom of the receiving groove 13134, so that the first conductive part 1311 and the second conductive part 1312 are electrically connected by means of the connecting part 1313, to transmit signals between the first conductive part 1311 and the second conductive part 1312, prevent the transmission interruption of the trace 1310, and contribute to ensuring the transmission reliability of the flexible circuit board 1000. The right side protrusion 13135 is separated from the outer side wall 13132.

[0102] As Fig.11 and Fig.12 , in some embodiments, the side wall of the side protrusion 13135 close to the first limiting protrusion 13131 is inclined towards the first conductive part 1311; and / or, the outer side wall 13132 is inclined towards the second conductive part 1312.

[0103] Taking Fig.11 the structure and direction shown as an example, the right side wall of the side protrusion 13135 on the left side is close to the first limiting protrusion 13131, and it is inclined towards the first conductive part 1311, so that the side protrusion 13135 forms a helical tooth-like structure. Correspondingly, the left outer side wall 13132 is also inclined, and the inclination angle matches the inclination angle of the right side wall of the above side protrusion 13135.

[0104] In this embodiment, when the trace 1310 is in a natural state, the side protrusions 13135 on both sides of the first limiting protrusion 13131 can play a certain limiting role, and at this time, the first conductive part 1311 and the second conductive part 1312 can form an interlock through the connecting part 1313.

[0105] As Fig.12 , when the flexible circuit board 1000 is subjected to a force (the direction of the force can be as Fig.12 shown by the arrow in), after being driven by the force, the side protrusion 13135 moves into the receiving groove 13134, so that the connecting part 1313 is unlocked. Designing the side protrusion 13135 as a helical tooth-like structure can reduce the sliding resistance of the outer side wall 13132 to the side protrusion 13135, to prevent the connecting part 1313 from being locked, and ensure that the first conductive part 1311 and the second conductive part 1312 can move relatively under the drive of the force to release the force.

[0106] It should be noted that when the first conductive portion 1311 and the second conductive portion 1312 are arranged at intervals along the first direction, electrical connection can also be achieved through the side protrusion 13135 and the first limiting protrusion 13131 arranged therebetween. The beneficial effect is the same as the beneficial effect of the first locking arm 13141 and the second locking arm 13142 being arranged alternately along the first direction, and will not be repeated here.

[0107] Based on the same inventive concept and in combination with the description of the flexible circuit boards of the above embodiments, this embodiment provides a display device having the corresponding technical effects of the flexible circuit boards of the above embodiments, which will not be described in detail herein.

[0108] A display device includes the flexible circuit board as described in the above embodiments.

[0109] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims.

[0110] The various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0111] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

[0112] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0113] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0114] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A flexible circuit board, characterized in that: include: The conductive layer includes at least one wiring, wherein the wiring includes a first conductive portion and a second conductive portion that can move relatively, a connecting portion is provided between the first conductive portion and the second conductive portion, and the first conductive portion and the second conductive portion are electrically connected through the connecting portion; The flexible base layer is arranged on at least one side of the conductive layer along a first direction, and the first conductive part and the second conductive part are respectively connected to the flexible base layer.

2. The flexible circuit board according to claim 1, characterized in that: The first conductive part and the connecting part are arranged at intervals along the second direction, and a compression mechanism is arranged between the first conductive part and the connecting part; the routing line has a natural state and a compressed state, and when the routing line is in the natural state, the compression mechanism is locked to prevent the first conductive part and the connecting part from moving away from each other; when the routing line is in the compressed state, the compression mechanism is unlocked, and the first conductive part and the connecting part are close to each other; The second direction is an extending direction of the routing line.

3. The flexible circuit board according to claim 2, characterized in that: The compression mechanism comprises a first locking arm and a second locking arm arranged alternately, one end of the first locking arm is connected to the connecting portion, and one end of the second locking arm is connected to the first conductive portion; A first protrusion and a second protrusion distributed along the second direction are arranged between the first locking arm and the second locking arm, and the first protrusion is close to the first conductive portion; the first protrusion is connected to the first locking arm and keeps contact with the second locking arm, and the second protrusion is connected to the second locking arm and keeps contact with the first locking arm; when the compression mechanism is locked, the first protrusion and the second protrusion abut against each other, the first locking arm is spaced from the first conductive portion along the second direction, and the second locking arm is spaced from the connecting portion along the second direction.

4. The flexible circuit board according to claim 3, characterized in that: The first locking arms and the second locking arms are alternately arranged along the first direction or the third direction; the third direction, the first direction and the second direction are perpendicular to each other.

5. The flexible circuit board according to claim 1, characterized in that: The second conductive part and the connecting part are spaced apart along the second direction, and a stretching mechanism is provided between the second conductive part and the connecting part; the routing line has a natural state and a tensioned state, and when the routing line is in the natural state, the stretching mechanism is locked to prevent the second conductive part and the connecting part from approaching each other; when the routing line is in the tensioned state, the stretching mechanism is unlocked, and the second conductive part and the connecting part are away from each other.

6. The flexible circuit board according to claim 5, characterized in that: The stretching mechanism comprises a third locking arm and a fourth locking arm which are arranged alternately, one end of the third locking arm is connected to the connecting portion, and one end of the fourth locking arm is connected to the second conductive portion; A third protrusion and a fourth protrusion distributed along the second direction are provided between the third locking arm and the fourth locking arm, and the third protrusion is close to the second conductive portion; the third protrusion is connected to the third locking arm and keeps contact with the fourth locking arm, and the fourth protrusion is connected to the fourth locking arm and keeps contact with the third locking arm; When the stretching mechanism is locked, the third protrusion and the fourth protrusion are spaced apart, the third locking arm is spaced apart from the second conductive portion, and the fourth locking arm is in contact with the connecting portion; or, when the stretching mechanism is locked, the third protrusion and the fourth protrusion are spaced apart, the third locking arm is in contact with the second conductive portion, and the fourth locking arm is spaced apart from the connecting portion.

7. The flexible circuit board according to claim 6, characterized in that: The third locking arm and the fourth locking arm are staggered along the first direction or the third direction.

8. The flexible circuit board according to claim 1, characterized in that: The routing line includes a compression mechanism and a tension mechanism, and the compression mechanism and the tension mechanism are arranged in pairs in the routing line.

9. The flexible circuit board according to claim 1, characterized in that: At least two conductive layers are stacked, and the flexible base layer is at least arranged between two adjacent conductive layers.

10. The flexible circuit board according to claim 1, characterized in that: The flexible base layer is provided with a protruding flexible spacer, and the flexible spacer is arranged on at least one side of the routing line along the third direction.

11. The flexible circuit board according to claim 10, characterized in that: The conductive layer includes a plurality of the routing lines spaced apart along a third direction, and the flexible spacing portion is at least disposed between two adjacent routing lines.

12. The flexible circuit board according to claim 10, characterized in that: The routing line has at least one of a compression state and a tension state, and a natural state; the material of the flexible spacer and the flexible base layer is a shear-thinning non-Newtonian fluid material; When the routing line switches between the natural state and the tension state, or when the routing line switches between the compression state and the natural state, the flexible spacer and the flexible base layer are used to flow and fill the gaps between the first conductive part, the connecting part and the second conductive part.

13. The flexible circuit board according to claim 1, characterized in that: The first conductive part and the second conductive part are arranged at intervals along the third direction, the connecting part includes a first limiting protrusion connected to the first conductive part, and at least two side protrusions respectively arranged on both sides of the first limiting protrusion along the second direction, and the side protrusions are connected to the second conductive part; the first limiting protrusion includes two outer side walls arranged opposite to each other along the second direction, and an end portion located between the two outer side walls, the end portion is provided with a receiving groove, and the groove bottom of the receiving groove faces the second conductive part; When the routing is in a natural state, at least two of the side protrusions are in contact with the corresponding outer side walls; when the routing is in a tension state or a compression state, the side protrusion located on one side of the first limiting protrusion moves into the accommodating groove and contacts the bottom of the groove, and the side protrusion located on the other side is separated from the corresponding outer side wall.

14. The flexible circuit board according to claim 13, characterized in that: The side wall of the side protrusion close to the first limiting protrusion is inclined toward the first conductive part; and / or the outer side wall is inclined toward the second conductive part.

15. A display device, characterized in that: Comprising the flexible circuit board as claimed in any one of claims 1 to 14.

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