Circuit structure of mobile terminal and mobile terminal

Abstract

The present application discloses a circuit structure of a mobile terminal and a mobile terminal, belonging to the field of equipment technology. The mobile terminal includes a first circuit board and a second circuit board, the first circuit board and the second circuit board are located in an inner cavity formed by a shell of the mobile terminal and a flexible screen, and the first circuit board is opposite to a first screen area of ​​the flexible screen, the second circuit board is opposite to a second screen area of ​​the flexible screen, and the first screen area and the second screen area are connected through a foldable screen area of ​​the flexible screen; the circuit structure includes: a first foldable support sheet, located in the inner cavity; a circuit layer, arranged on the surface of the first foldable support sheet, and the circuit layer is connected to the first circuit board and the second circuit board respectively.

Description

Technical Field

[0001] The present application belongs to the field of equipment technology, and specifically relates to a circuit structure of a mobile terminal and a mobile terminal. Background Art

[0002] With the breakthrough and development of flexible screen technology, foldable terminals have realized the user demand for large screens and also met the user's visual experience needs when browsing the web, playing games or watching videos. While pursuing large screens, they have improved the portability and grip comfort of mobile terminals. Foldable terminals have the characteristics of portability, bendability and multi-angle hovering, and have broad market application prospects.

[0003] In order to meet the high demand for folding times of foldable terminals, in addition to the need to introduce a screen with better flexibility, a circuit structure that can adapt to the bending of the foldable terminal is also needed.

[0004] However, the circuit structure commonly used in the current foldable terminal is a multi-level structure. During the bending process, the circuit structure is easily deformed, which shortens the service life of the circuit structure. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a circuit structure of a mobile terminal and a mobile terminal, which can increase the service life of the circuit structure.

[0006] In a first aspect, an embodiment of the present application provides a circuit structure of a mobile terminal, the mobile terminal comprising a first circuit board and a second circuit board, the first circuit board and the second circuit board being located in an inner cavity formed by a housing and a flexible screen of the mobile terminal, the first circuit board being opposite to a first screen area of ​​the flexible screen, the second circuit board being opposite to a second screen area of ​​the flexible screen, the first screen area and the second screen area being connected via a foldable screen area of ​​the flexible screen;

[0007] The circuit structure comprises:

[0008] A first foldable support sheet, located in the inner cavity;

[0009] The circuit layer is arranged on the surface of the first foldable supporting sheet, and the circuit layer is respectively connected to the first circuit board and the second circuit board.

[0010] In a second aspect, an embodiment of the present application provides a mobile terminal, including a housing, a flexible screen, a first circuit board, a second circuit board, and the circuit structure described in the first aspect.

[0011] The circuit structure of this embodiment is provided with a first foldable support sheet. By providing a circuit layer on the surface of the first foldable support sheet, even if the flexible screen of the mobile device is bent, the first foldable support sheet is bent, and the bending force is mainly on the first foldable support sheet. The bending force on the circuit layer is smaller, and the circuit layer is not easily deformed, thereby increasing the life of the circuit layer and further increasing the service life of the circuit structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0013] Figure 1 is one of the structural diagrams of a circuit structure according to an embodiment of the present application;

[0014] Figure 2 This is a second structural diagram of a circuit structure according to an embodiment of the present application;

[0015] Figure 3 is one of the partial stacking diagrams of another circuit structure according to an embodiment of the present application;

[0016] Figure 4 This is a third structural diagram of a circuit structure according to an embodiment of the present application;

[0017] Figure 5 This is a second partial stacking diagram of a circuit structure according to an embodiment of the present application;

[0018] Figure 6 is a partial schematic diagram of a circuit structure according to an embodiment of the present application;

[0019] Figure 7 This is one of the routing diagrams of the conductors of a circuit structure in a foldable connection area according to an embodiment of the present application;

[0020] Figure 8 This is the second routing diagram of the conductors in the foldable connection area of ​​a circuit structure according to an embodiment of the present application.

[0021] Figures 1 to 8Reference numerals: 100, mobile terminal; 101, first circuit board; 102, second circuit board; 103, housing; 104, flexible screen; 105, inner cavity; 110, first foldable support sheet; 111, circuit layer; 112, first flexible circuit board; 113, second flexible circuit board; 114, third flexible circuit board; 115, second foldable support sheet; 1151, third area; 1152, fourth area; 1153, second Foldable area of ​​the foldable support sheet; 1101, first area; 1102, second area; 1103, foldable connection area; 11031, metal suspension wire; 11032, first hollow area; 11033, second hollow area; 1041, first screen area; 1042, second screen area; 1043, foldable screen area; 1111, insulating layer; 1112, wire layer; 11121, wire; 120, connector. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0025] Combine the following Figures 1 to 8 The circuit structure according to the embodiment of the present application is described.

[0026] like Figure 1-3As shown, the present application provides a circuit structure of a mobile terminal 100 of an embodiment, the mobile terminal 100 includes a first circuit board 101 and a second circuit board 102, the first circuit board 101 and the second circuit board 102 are located in an inner cavity 105 formed by a housing 103 of the mobile terminal 100 and a flexible screen 104, the first circuit board 101 is opposite to a first screen area 1041 of the flexible screen 104, the second circuit board 102 is opposite to a second screen area 1042 of the flexible screen 104, and the first screen area 1041 and the second screen area 1042 are connected via a foldable screen area 1043 of the flexible screen 104;

[0027] The line structure includes:

[0028] A first foldable support sheet 110 is located in the inner cavity 105;

[0029] The circuit layer 111 is disposed on the surface of the first foldable supporting sheet 110 , and the circuit layer 111 is connected to the first circuit board 101 and the second circuit board 102 respectively.

[0030] The housing 103 may be a plastic housing 103 , which can reduce the weight of the mobile terminal 100 and make the mobile terminal 100 more portable.

[0031] The flexible screen 104 includes a first screen area 1041, a second screen area 1042 and a foldable screen area 1043 connected between the first screen area 1041 and the second screen area 1042. The bending of the foldable screen area causes the flexible screen 104 of the mobile terminal 100 to bend. The first circuit board 101 is opposite to the first screen area 1041 of the flexible screen 104, and the second circuit board 102 is opposite to the second screen area 1042 of the flexible screen 104. It can be understood that the first circuit board 101 and the second circuit board 102 are opposite to different screen areas of the flexible screen 104, that is, the first circuit board 101 and the second circuit board 102 are located at different positions in the inner cavity, the circuit layer 111 is located in the inner cavity 105, and the first foldable support sheet 110 can also be called a bendable support sheet or a bendable support sheet.

[0032] The circuit layer 111 may be directly electrically connected to the first circuit board 101 and the second circuit board 102, or may be electrically connected via other connectors (e.g., conductive adhesive or hot-pressed welders, etc.). The first circuit board 101 may also be referred to as a main board, which may be used to carry electronic components and transmit signals, and the second circuit board 102 may also be referred to as a sub-board, which may be used to carry electronic components and transmit signals. The circuit layer 111 is connected to the first circuit board 101 and the second circuit board 102, respectively, and the circuit layer 111 may transmit signals between the first circuit board 101 and the second circuit board 102.

[0033] The circuit structure of this embodiment is provided with a first foldable support sheet 110. By providing a circuit layer 111 on the surface of the first foldable support sheet 110, even if the flexible screen 104 of the mobile device is bent, the first foldable support sheet 110 is bent, and the bending force is mainly on the first foldable support sheet 110. The bending force on the circuit layer 111 is relatively small, and the circuit layer 111 is not easily deformed, thereby improving the service life of the circuit layer 111 and further improving the service life of the circuit structure.

[0034] As an example, the first foldable support sheet 110 can be a first foldable metal sheet, and the maximum tolerable bending times can reach more than 300,000 times. The first foldable metal sheet includes but is not limited to a foldable stainless steel sheet, etc. The use of a foldable stainless steel sheet can prevent rust from interfering with the normal communication of the circuit layer 111 integrated on the surface of the foldable stainless steel sheet and negatively affecting the life of the circuit layer 111. And due to the properties of the first foldable metal sheet itself, it can withstand more bending and is not easy to deform. The circuit layer 111 is arranged on the surface of the first foldable metal sheet, so that the overall circuit structure is not easy to deform, thereby increasing the service life of the circuit structure.

[0035] like Figure 1 As shown, in one embodiment, the first foldable support sheet 110 is attached to the side of the flexible screen 104 facing the inner cavity 105 to support the flexible screen 104 , and the surface is the side of the first foldable support sheet 110 facing the inner cavity 105 .

[0036] The first foldable support sheet 110 can not only support the flexible screen 104, but also integrate the circuit layer 111. After the circuit layer 111 is integrated on the surface of the first foldable support sheet 110, the first foldable support sheet 110 can be used as an integrated circuit metal sheet. It is understandable that a common metal sheet can be used to support the foldable screen and set the circuit layer 111, reducing the use of devices, thereby reducing the space occupied by the devices in the inner cavity 105. In addition, the first foldable support sheet 110 is attached to one side of the flexible screen 104, which can reduce the mobility of the first foldable support sheet 110 in the inner cavity 105, thereby improving the stability of the circuit structure.

[0037] like Figure 1 As shown, in one embodiment, the circuit structure further includes a first flexible circuit board 112 and a second flexible circuit board 113;

[0038] Among them, one end of the circuit layer 111 is connected to one end of the first circuit board 101 through the first flexible circuit board 112, the other end of the first circuit board 101 is connected to the flexible screen 104 through the first flexible circuit board 112, and the other end of the circuit layer 111 is connected to the second circuit board 102 through the second flexible circuit board 113.

[0039] One end of the circuit layer 111 and the first end of the first flexible circuit board 112 may be directly electrically connected, or may be electrically connected through other connecting members, for example, Figure 3 As shown, the circuit layer 111 is electrically connected through the connector 120, and a guide hole is provided in the circuit layer 111 for connecting different layers of wires 11121. The second end of the first flexible circuit board 112 can be directly electrically connected to the first end of the first circuit board 101, or can be electrically connected through other connectors, so that one end of the circuit layer 111 is connected to the first end of the first circuit board 101 through the first flexible circuit board 112, and one end of the circuit layer 111 can transmit signals between the first flexible circuit board 112 and the first circuit board 101. The second end of the first circuit board 101 can be directly electrically connected to the third end of the first flexible circuit board 112, or can be electrically connected through other connectors, and the fourth end of the first flexible circuit board 112 can be directly electrically connected to the flexible screen 104, or can be electrically connected through other connectors, so that the second end of the first circuit board 101 is connected to the flexible screen 104 through the first flexible circuit board 112, and the second end of the first circuit board 101 can transmit signals between the first flexible circuit board 112 and the flexible screen 104. The other end of the circuit layer 111 can be directly electrically connected to one end of the second flexible circuit board 113, or can be electrically connected through other connectors, and the other end of the second flexible circuit board 113 can be directly electrically connected to the second circuit board 102, or can be electrically connected through other connectors, so that the other end of the circuit layer 111 is connected to the second circuit board 102 through the second flexible circuit board 113, and the other end of the circuit layer 111 can transmit signals between the second flexible circuit board 113 and the second circuit board 102. It should be noted that other connectors in various embodiments of the present application may include but are not limited to conductive adhesives or hot-pressed welding parts.

[0040] In this embodiment, a flexible circuit board is used for connecting the first circuit board 101 and the flexible screen 104 and for connecting the first circuit board 101 and one end of the circuit layer 111. A flexible circuit board is also used for connecting the second circuit board 102 and the other end of the circuit layer 111. This can improve the flexibility of the circuit board, thereby improving the flexibility of the overall circuit structure. Even if the mobile terminal 100 is folded, the circuit structure is not easily deformed, which can increase the service life of the circuit structure.

[0041] like Figure 2 As shown, in one embodiment, the first foldable support sheet 110 is spaced apart from the flexible screen 104, the circuit structure also includes a third flexible circuit board 114, one end of the first circuit board 101 is connected to the flexible screen 104 through the third flexible circuit board, and the other end of the first circuit board 101 is connected to one end of the second circuit board 102 through the circuit layer 111.

[0042] In this embodiment, the first foldable support sheet 110 is spaced apart from the flexible screen 104 so that there is a degree of freedom between the first foldable support sheet 110 and the flexible screen 104, which can prevent the flexible screen 104 from damaging the first foldable support sheet 110 during the bending process. In addition, in one example, the foldable area of ​​the first foldable support sheet 110 is arranged relative to the foldable area of ​​the flexible screen 104, so that the foldable area of ​​the first foldable support sheet 110 is bent during the bending process of the flexible screen 104, thereby improving the bending performance.

[0043] like Figure 2 As shown, in one embodiment, the circuit structure further includes a second foldable support sheet 115, which is attached to a side of the flexible screen 104 facing the inner cavity 105, and is used to support the flexible screen 104;

[0044] The second foldable support sheet 115 is located between the flexible screen 104 and the first foldable support sheet 110 , and a foldable region of the second foldable support sheet 115 is arranged opposite to a foldable region of the first foldable support sheet 110 .

[0045] The second foldable support sheet 115 can also be called a bendable support layer or a bendable support layer. The second foldable support sheet 115 is attached to the side of the flexible screen 104 facing the inner cavity 105, which can reduce the mobility of the foldable metal support in the inner cavity 105, thereby improving the stability of the circuit structure, and the second foldable support sheet 115 is attached to the flexible screen 104, which can provide support for the flexible screen 104. At the same time, the foldable area of ​​the second foldable support sheet 115 is arranged relative to the foldable area of ​​the first foldable support sheet 110, and the foldable area of ​​the second foldable support sheet 115 and the foldable area of ​​the first foldable support sheet 110 can bend with the bending of the flexible screen 104, that is, when the flexible screen 104 is bent, the foldable area of ​​the first foldable support sheet 110 is bent, and the foldable area of ​​the second foldable support sheet 115 is bent, and the foldable area has a bendable performance, thereby improving the overall bending performance of the circuit structure.

[0046] As an example, the second foldable support sheet 115 can be a second foldable metal sheet, which can include but is not limited to a foldable stainless steel support layer. Due to the properties of the second foldable metal sheet itself, it can withstand more bending and is not easy to deform, so that the circuit structure is not easy to deform, and the service life of the circuit structure is improved. In addition, the second foldable support sheet 115 of this embodiment may include a third area 1151, a fourth area 1152, and a foldable area 1153 of the second foldable support sheet 115 connected between the third area 1151 and the fourth area 1152. The foldable area 1153 of the second foldable support sheet 115 can be attached to the side of the foldable screen area 1043 facing the inner cavity 105, the third area 1151 can be attached to the side of the first screen area 1041 facing the inner cavity 105, and the fourth area 1152 can be attached to the side of the second screen area 1042 facing the inner cavity 105. In this way, when the flexible screen 104 is bent, the foldable area 1103 of the first foldable support sheet 110 is bent, and the foldable area 1153 of the second foldable support sheet 115 is bent, and the foldable area has bendable properties, thereby improving the overall bending performance of the circuit structure.

[0047] like Figure 2 As shown, in one embodiment, the foldable area of ​​the second foldable supporting sheet 115 is a foldable area with a hollow structure.

[0048] Since the foldable area of ​​the second foldable support sheet 115 is a foldable area with a hollow structure, during the bending process, due to the hollow area, the foldable area can extend along both sides to buffer the bending stress and improve the bending performance of the foldable area of ​​the second foldable support sheet 115, thereby improving the bending life of the second foldable support sheet 115.

[0049] like Figure 1-2 As shown, in one embodiment, the first foldable support sheet 110 includes a first area 1101, a second area 1102, and a foldable connection area 1103 connected between the first area 1101 and the second area 1102;

[0050] The foldable connection area 1103 is attached to a side of the foldable screen area 1043 facing the inner cavity 105 , or the foldable connection area 1103 is opposite to the foldable screen area 1043 and is spaced apart from each other.

[0051] The foldable area of ​​the first foldable support sheet 110 is the foldable connection area 1103, and the foldable connection area 1103 is attached to the side of the foldable screen area 1043 facing the inner cavity 105, which can reduce the mobility of the first foldable support sheet 110 in the inner cavity 105, thereby improving the stability of the circuit structure. Alternatively, the foldable connection area 1103 and the foldable screen area 1043 are opposite and spaced apart, and the spaced apart arrangement can make the first foldable support sheet 110 and the flexible screen 104 have a degree of freedom, which can avoid the flexible screen 104 from damaging the first foldable support sheet 110 during the bending process, and the relative arrangement can make the foldable area of ​​the first foldable support sheet 110 bend during the folding screen bending process, thereby improving the bending performance.

[0052] In one embodiment, the foldable connection area 1103 is a foldable area with a hollow structure. On the surface of the foldable connection area 1103 facing the inner cavity 105 , the conductive wire 11121 of the circuit layer 111 is arranged to fit the surface of the foldable connection area 1103 .

[0053] Since the foldable connection area 1103 is a foldable area with a hollow structure, during the bending process, due to the hollow area, the foldable connection area 1103 can extend along both sides to buffer the bending stress, improve the bending performance of the foldable connection area 1103, and further improve the bending life of the foldable connection area 1103. At the same time, wiring can be performed on the surface of the foldable connection area 1103 facing the inner cavity 105, and the wires 11121 of the circuit layer 111 are arranged in contact with the surface of the foldable connection area 1103 to achieve the wiring of the wires 11121 on the surface of the foldable connection area 1103. In this way, on the surface of the foldable connection area 1103, the wires 11121 of the circuit layer 111 can be wired according to the shape of the surface of the foldable connection area 1103, which can improve the stability of the wiring of the wires 11121 of the circuit layer 111 on the surface of the foldable connection area 1103.

[0054] For example, Figure 4-6 As shown, the foldable connection area 1103 of the first foldable support sheet 110 includes a metal suspension wire 11031, and the metal suspension wire 11031 forms a hollow area, for example, Figure 4 As shown, the hollow area may include a first hollow area 11032 and a second hollow area 11033 , and the conductive wires 11121 of the circuit layer 111 may be routed on the surface of the metal suspension wire 11031 of the foldable connection area 1103 .

[0055] like Figure 7 FIG. 1 is a schematic diagram of the routing (wiring) of the wire 11121 on the surface of the foldable connection area 1103 of an embodiment of the present invention. The routing is along Figure 7The "Ji" character wiring in black Figure 7 Wiring can be performed on the surfaces of all the "Ji" character metal suspension wires 11031 in the hollowed-out area. Another example is Figure 8 As shown, in addition to Figure 7 the wire routing shape shown, there can be other wire routing shapes. For example, the hollow structure of the foldable connection area 1103 can be comb-shaped, Figure 8 and wiring can be performed on the surface of the "Yi" character metal suspension wire 11031.

[0056] As Figure 3 shown, in one embodiment, the circuit layer 111 includes an insulating layer 1111 provided on the surface of the first foldable support sheet 110 and a wire layer 1112 provided in the insulating layer 1111. The insulating layer 1111 is a high-frequency dielectric insulating layer 1111.

[0057] The circuit layer 111 can adopt the high-frequency dielectric insulating layer 1111, enabling the circuit structure to transmit high-frequency signals and improving the signal transmission performance of the circuit structure. It should be noted that the wire 11121 is a wire in the wire layer 1112.

[0058] The embodiment of the present application also provides a mobile terminal 100, including a housing 103, a flexible screen 104, a first circuit board 101, a second circuit board 102, and the circuit structure in any one of the above embodiments.

[0059] For the specific implementation manner of the circuit structure in the mobile terminal 100, reference can be made to the description of the circuit structure embodiment above, and the same beneficial effects can be achieved. To avoid repetition, it will not be elaborated here.

[0060] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0061] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A circuit structure of a mobile terminal, characterized in that: The mobile terminal includes a first circuit board and a second circuit board, the first circuit board and the second circuit board are located in an inner cavity formed by a housing of the mobile terminal and a flexible screen, the first circuit board is opposite to a first screen area of ​​the flexible screen, the second circuit board is opposite to a second screen area of ​​the flexible screen, and the first screen area and the second screen area are connected through a foldable screen area of ​​the flexible screen; The circuit structure comprises: A first foldable support sheet, located in the inner cavity, and the first foldable support sheet is used to support the flexible screen; The circuit layer is arranged on the surface of the first foldable supporting sheet, and the circuit layer is respectively connected to the first circuit board and the second circuit board.

2. The circuit structure according to claim 1, characterized in that: The first foldable support sheet is attached to a side of the flexible screen facing the inner cavity, and the surface is a side of the first foldable support sheet facing the inner cavity.

3. The circuit structure according to claim 2, characterized in that: The circuit structure also includes a first flexible circuit board and a second flexible circuit board; Among them, one end of the circuit layer is connected to the first end of the first circuit board through the first flexible circuit board, the second end of the first circuit board is connected to the flexible screen through the first flexible circuit board, and the other end of the circuit layer is connected to the second circuit board through the second flexible circuit board.

4. The circuit structure according to claim 1, characterized in that: The first foldable support sheet includes a first area, a second area, and a foldable connection area connected between the first area and the second area; wherein the foldable connection area is attached to a side of the foldable screen area facing the inner cavity.

5. The circuit structure according to claim 4, characterized in that: The foldable connection area is a foldable area with a hollow structure. On the surface of the foldable connection area facing the inner cavity, the conductive wires of the circuit layer are arranged in contact with the surface of the foldable connection area.

6. The circuit structure according to claim 1, characterized in that: The circuit layer includes an insulating layer arranged on the surface of the first foldable supporting sheet and a conductive wire layer arranged in the insulating layer, and the insulating layer is a high-frequency dielectric insulating layer.

7. A circuit structure of a mobile terminal, characterized in that: The mobile terminal includes a first circuit board and a second circuit board, the first circuit board and the second circuit board are located in an inner cavity formed by a housing of the mobile terminal and a flexible screen, the first circuit board is opposite to a first screen area of ​​the flexible screen, the second circuit board is opposite to a second screen area of ​​the flexible screen, and the first screen area and the second screen area are connected through a foldable screen area of ​​the flexible screen; The circuit structure comprises: A first foldable support sheet, located in the inner cavity; A circuit layer, disposed on a surface of the first foldable support sheet, the circuit layer being connected to the first circuit board and the second circuit board respectively; The second foldable support sheet is used to support the flexible screen, and the second foldable support sheet is located between the flexible screen and the first foldable support sheet.

8. The circuit structure according to claim 7, characterized in that: The circuit structure also includes a third flexible circuit board, one end of the first circuit board is connected to the flexible screen through the third flexible circuit board, and the other end of the first circuit board is connected to one end of the second circuit board through the circuit layer.

9. The circuit structure according to claim 8, characterized in that: The second foldable supporting sheet is attached to a side of the flexible screen facing the inner cavity; The foldable area of ​​the second foldable supporting sheet is arranged opposite to the foldable area of ​​the first foldable supporting sheet.

10. The circuit structure according to claim 9, characterized in that: The foldable area of ​​the second foldable supporting sheet is a foldable area of ​​a hollow structure.

11. The circuit structure according to claim 7, characterized in that: The first foldable supporting sheet comprises a first area, a second area and a foldable connecting area connected between the first area and the second area; Wherein, the foldable connection area is opposite to the foldable screen area and is arranged at an interval.

12. The circuit structure according to claim 11, characterized in that: The foldable connection area is a foldable area with a hollow structure. On the surface of the foldable connection area facing the inner cavity, the conductive wires of the circuit layer are arranged in contact with the surface of the foldable connection area.

13. The circuit structure according to claim 7, characterized in that: The circuit layer includes an insulating layer arranged on the surface of the first foldable supporting sheet and a conductive wire layer arranged in the insulating layer, and the insulating layer is a high-frequency dielectric insulating layer.

14. A mobile terminal, characterized in that: It comprises a housing, a flexible screen, a first circuit board, a second circuit board and the circuit structure described in any one of claims 1 to 6.

15. A mobile terminal, characterized in that: It comprises a housing, a flexible screen, a first circuit board, a second circuit board and the circuit structure described in any one of claims 7 to 13.

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