Patent Description:
With continuous improvement of people's living standards, more attention is paid to a screen display effect of a mobile terminal such as a mobile phone. However, a size of the mobile phone restricts expansion of a screen size.

Currently, to implement a relatively large screen size on a relatively small mobile phone, the mobile phone may use a foldable structure. Specifically, the mobile phone may usually have two main bodies that can relatively rotate around a rotating shaft and can be folded, and a flexible screen body of a screen covers both surfaces of the two main bodies of the mobile phone. When the two bodies rotate around the rotating shaft between the bodies to be in a same plane, the screen is in an unfolded state and has a relatively large display area. When the two bodies rotate around the rotating shaft to be relatively folded, the mobile phone has a relatively small volume and size. Electronic components such as circuit boards are disposed in the two main bodies. An electrical connection between the electronic components in the different main bodies is implemented through a flexible electrical connection line that crosses two sides of the rotating shaft.

However, to adapt to folded and unfolded states of the mobile phone, the flexible electrical connection line needs to have a specific redundant length, and is in a different bending state as the mobile phone is opened or closed each time. In this way, the flexible electrical connection line is prone to break or scratch with another structure, and reliability is relatively poor. <CIT> discloses an electronic device including a first housing and a second housing, wherein a hinge structure may be disposed between the first housing and the second housing. Further, a flexible printed circuit board may be disposed across the first housing and the second housing. For example, the flexible printed circuit board may extend from the first housing through the hinge structure to the second housing. <CIT> discloses a mobile terminal having first to third bodies, wherein first to third magnet portions are disposed in a section needed to be fixed and coupled in the body part of the mobile terminal so that the first to third bodies are coupled in a fixed state when they are aligned in a row or overlap one another. For example, the first magnet portion may be disposed on a button portion that can be pressed by an external force and the second and third magnet portions may be disposed respectively on end portions of the second and third bodies, respectively.

This application provides a foldable screen device, which has relatively high electrical connection reliability. The technical improvement is achieved by the solution provided in accordance with the claims.

According to a first aspect, this application provides a foldable screen device, including two frames, a rotating shaft assembly articulated with the two frames, and an electrical connection line. The two frames are capable of rotating around rotating shafts of the rotating shaft assembly to be closed or opened. The rotating shaft assembly includes a connection structure and hinges. The hinge is connected between the connection structure and the frame, the connection structure has channels passing through two opposite sides of the rotating shaft assembly, two ends of the electrical connection line are respectively connected to the two frames, the electrical connection line penetrates into the channel, and the channel and the hinge are located at different positions of the rotating shaft assembly in an axial direction. In this way, the electrical connection line is positioned by the rotating shaft assembly, so that bending deformation generated by the electrical connection line when the foldable screen device is folded is relatively small, and a bending amount is prone to control. Therefore, connection reliability is high.

In an optional implementation, the connection structure is located in a middle region of the rotating shaft assembly in an axial direction. In this way, a region in which the connection structure is located may form a static accommodation space, and the electrical connection line positioned by the connection structure may pass through and be accommodated in the region, and is not interfered by a structure such as the rotating shaft during rotation.

Further, the connection structure includes a first shaft cover and a second shaft cover, the first shaft cover and the second shaft cover are disposed opposite to each other, the first shaft cover is located on a side that is of the rotating shaft assembly and that is close to articulated ends of the frames, the second shaft cover is located on a side that is of the rotating shaft assembly and that is close to free ends of the frames, and the first shaft cover and the second shaft cover enclose a space that can accommodate the rotating shafts. In this way, the first shaft cover and the second shaft cover jointly form the accommodation space, and the electrical connection line is accommodated inside the accommodation space. Therefore, the electrical connection line is shielded and protected by the first shaft cover and the second shaft cover. In this way, structure reliability is relatively high, and appearance is relatively good.

Further, the connection structure further includes a positioning piece, the positioning piece is located in the space jointly enclosed by the first shaft cover and the second shaft cover, and the channel is jointly formed by the positioning piece and one of the first shaft cover and the second shaft cover.

In this way, the positioning piece and the first shaft cover or the second shaft cover jointly form a positioning point located at the middle segment of the electrical connection line, and positions of the middle segment and end parts of the electrical connection line are all positioned, so that a length of a part that can be freely bent and that is of the electrical connection line is reduced, and correspondingly, a bending deformation amplitude is also reduced. In addition, the entire electrical connection line is divided into two segments with similar lengths in a length direction, bending deformation amounts of the two segments of the electric connection line are relatively similar, and deformation and displacement of the two segments are relatively synchronous. In this way, the electrical connection line positioned with the aid of the rotating shaft assembly generates small bending deformation when the foldable screen device is folded, and a bending amount is prone to control. Therefore, connection reliability is high.

In an optional implementation, the positioning piece and the first shaft cover jointly enclose the channel.

Further, the foldable screen device further includes a first magnetic piece and a second magnetic piece. The first magnetic piece is disposed on the first shaft cover, the second magnetic piece is disposed on the positioning piece, and the first magnetic piece and the second magnetic piece are attractable to each other, so that the positioning piece and the first shaft cover are positioned to each other. In this way, by using the magnetic force of the magnetic pieces, the electrical connection line may be disposed on an assembly component in advance in an assembly process of the rotating shaft assembly, to prevent the electrical connection line from being detached from an assembly position due to external pulling or other forces, and effectively reduce assembly difficulty. In addition, by using an attraction function of the magnetic pieces, the first shaft cover and the positioning piece can clamp tightly, or the electrical connection line can be attached to the first shaft cover, to assist in positioning the electrical connection line.

In an optional implementation, both the first magnetic piece and the second magnetic piece are magnets.

In an optional implementation, one of the first magnetic piece and the second magnetic piece is a magnet, and the other is a soft magnet. In this way, the first magnetic piece and the second magnetic piece are disposed in a relatively free manner, and structures are relatively simple.

In an optional implementation, the electrical connection line includes a flexible printed circuit board. The flexible printed circuit board includes a plurality of leads, so that transmission of a plurality of different electrical signals can be implemented.

In an optional manner, the electrical connection line further includes a cable, and the flexible printed circuit board and the cable are spaced apart and disposed side by side. The cable may be configured to transmit different signals such as a coaxial signal, and the cable and the flexible printed circuit board are disposed relatively independently without interference or mutual impact.

In an optional manner, a guide groove is provided on the second fixing surface of the positioning piece, the guide groove passes through two opposite sides in a width direction of the positioning piece, a groove opening of the guide groove faces the first shaft cover, and the cable penetrates into the guide groove. A cable segment that is of the cable and that is located between the positioning piece and the first shaft cover may be partially or all buried in the guide groove, to be positioned.

In an optional implementation, the foldable screen device further includes a flexible protective cover. Edges of two opposite sides of the flexible protective cover are respectively connected to the two frames, and the flexible protective cover covers a side that is of the electrical connection line and that faces the free end of the frame. When the foldable screen device is opened and closed, the flexible protective cover is blocked between the electrical connection line and an outer structure, to prevent the outer structure from contacting the electrical connection line.

In an optional implementation, the flexible protective cover has a corrugated cover body. In this case, the entire flexible protective cover has an uneven corrugated surface, and the corrugated surface may be correspondingly unfolded or folded when the foldable screen device is opened or closed, to form protection regions of different sizes to adapt to different opening and closing angles of the foldable screen device.

In an optional implementation, the flexible protective cover is made of a thermally conductive material. In this way, the flexible protective cover connected between the different frames can transfer heat on a frame to another frame, so that temperatures of the two frames are relatively uniform. However, a temperature difference between parts that are of the flexible screen and that are correspondingly disposed on different frames is relatively small, and display uniformity is relatively good.

In an optional implementation, the flexible protective cover has a heat dissipation surface that is attached to a surface of the frame. The heat dissipation surface has a relatively large heat dissipation area. Therefore, the flexible protective cover can implement a relatively fast heat conduction speed by using the heat dissipation surface and the frame, so that there is relatively good temperature uniformity between the first frame and the second frame.

In this application, the foldable screen device includes a first frame, a second frame, and the rotating shaft assembly connected between the first frame and the second frame. The connection structure in the rotating shaft assembly forms a channel through which an electrical connection line can pass and that can fasten the electrical connection line. In this way, the electrical connection line is positioned by the rotating shaft assembly, and therefore, a length of a part that can be freely bent and that is of the electrical connection line is reduced, and correspondingly, a bending deformation amplitude is also reduced. In addition, the entire electrical connection line is divided into two segments with similar lengths in a length direction, bending deformation amounts of the two segments of the electric connection line are relatively similar, and deformation and displacement of the two segments are relatively synchronous. In this way, the electrical connection line positioned with the aid of the rotating shaft assembly generates small bending deformation when the foldable screen device is folded, and a bending amount is prone to control. Therefore, connection reliability is high.

Before embodiments of this application are described, to facilitate understanding of the technical solutions of this application, basic concepts and terms in embodiments of this application are first explained and described.

With emergence of a flexible screen, a terminal device such as a mobile phone may implement screen bending and folding by using the flexible screen, so that the terminal device has a relatively compact size, and the flexible screen has a relatively large display area. Correspondingly, the terminal device may be a foldable screen device or a curved screen device.

<FIG> is a schematic diagram of a structure of a foldable screen device according to an embodiment of this application. <FIG> is a schematic diagram of a structure of the foldable screen device in <FIG> in an unfolded state. <FIG> is a schematic diagram of a structure of the foldable screen device in <FIG> in a folded state. As shown in <FIG>, and <FIG>, a foldable screen device <NUM> includes two frames and a flexible screen <NUM> disposed on these frames. End parts that are of the adjacent two frames and that are close to a rotating shaft may rotate around the rotating shaft located between the two frames, so that ends that are of the two frames and that are away from the rotating shaft are relatively close to or away from each other, and the foldable screen device <NUM> may correspondingly present different states such as a folded state or an unfolded state. The flexible screen <NUM> covers surfaces of the frames, and may accordingly present a folded state, an unfolded state, or the like as positions of the adjacent frames change. Specifically, the foldable screen device <NUM> includes a first frame <NUM> and a second frame <NUM>. When the first frame <NUM> and the second frame <NUM> are unfolded, the first frame <NUM> and the second frame <NUM> are disposed side by side and on a same plane. Correspondingly, after the flexible screen <NUM> covering the surfaces of the frames is unfolded, a relatively large display surface may be formed, and the display surface may serve as an independent screen for displaying, as shown in <FIG>. It should be noted that a quantity of frames of the foldable screen device <NUM> may be two or more. When there are more than two frames, adjacent frames may rotate around rotating shafts parallel to each other, to form a multi-layer folded structure or be unfolded to form a larger display area. In this application, an example in which the foldable screen device <NUM> has two frames is mainly used for description.

A person skilled in the art may understand that a rotating shaft located between two adjacent frames may be a physical rotating shaft, or may be a virtual rotating shaft. When the rotating shaft is a virtual rotating shaft, the rotating shaft is not completely formed by physical components of the foldable screen device, but is a virtual rotating line formed by using shape constraints and displacement constraints of different components of the foldable screen device during relative movement. The two adjacent frames of the foldable screen device relatively rotate around the virtual rotating shaft during relative movement.

Components such as a primary circuit board, a processor, a memory, and a camera assembly inside the foldable screen device may be separately fastened to the first frame <NUM> or the second frame <NUM>. For example, the components such as the primary circuit board, the processor, and the memory may be disposed inside the first frame <NUM>, and the second frame <NUM> may be configured to carry the components such as the camera assembly and an antenna. In this case, to form an electrical connection between the components located in different frames, an electrical connection line is further disposed in the foldable screen device. Two ends of the electrical connection line are respectively connected to electrical connection points of the two adjacent different frames, to be connected to the different components such as the primary circuit board, the processor, the camera assembly, or the antenna in the frames and transmit an electrical signal. The electrical connection line is made of a flexible material, and may be accordingly bent or deformed as relative positions of the frames change. In this way, when the foldable screen device is in different states such as a folded state or an unfolded state, the electrical connection line can still maintain the electrical connection between the two adjacent frames depending on bending deformation of the electrical connection line.

Specifically, the electrical connection line may have a plurality of different structures and forms. The primary circuit board in the foldable screen device may be located in one of the frames, and the primary circuit board transmits an electrical signal to a plurality of other components. To implement an electrical connection between the primary circuit board and a component located in another frame, the electrical connection line includes a flexible printed circuit board (FPC). The flexible printed circuit board may include a plurality of leads, so that transmission of a plurality of different electrical signals can be implemented. In addition, the components such as the antenna in the foldable screen device may be electrically connected to the primary circuit board by using a coaxial cable. Therefore, in an optional manner, the electrical connection line may also include a single independently disposed cable, and the cable may be configured to implement signal transmission between two independent components. In this embodiment, a single cable may be configured to transmit different signals such as a coaxial signal.

However, to fold or unfold the flexible screen, the foldable screen device needs to have a relatively large unfolding and folding angle. For example, in the foldable screen device in <FIG>, an angle formed between the two frames of the foldable screen device may change between <NUM>° and <NUM>°. Accordingly, a spacing between two ends of the electrical connection line also changes in a relatively large range. Therefore, when the flexible screen is folded, a relatively long redundant length needs to be reserved for the electrical connection line, to adapt to the spacing between the electrical connection points on the two frames when the flexible screen is unfolded. When the redundant length of the electrical connection line is excessively long, the electrical connection line is only in a large-angle bending state in a region between the two frames, and then can be normally accommodated between the two frames. In addition, after the foldable screen device is opened and closed each time, the electrical connection line may be in a different bending state. Each time the foldable screen device is opened or closed, the electrical connection line switches between a large-angle bending state and an extended state, and the electrical connection line is prone to break or fail due to material fatigue. In addition, when the electrical connection line is bent at a large angle between the frames, the electrical connection line is prone to generate friction or scratch with another component inside the foldable screen device, to cause damage to a surface of the electrical connection line.

Therefore, this application provides a foldable screen device, so that a screen can be folded or unfolded through relative rotation of frames. In addition, an electrical connection line used to maintain an electrical connection between adjacent frames has relatively high reliability, and is not prone to break or wear. The following separately describes a specific structure of the foldable screen device by using different scenarios as examples.

<FIG> is a schematic exploded view of main components of the foldable screen device in <FIG>. As shown in <FIG>, a physical folded structure of the foldable screen device mainly includes a first frame <NUM>, a second frame <NUM>, and a rotating shaft assembly <NUM> connected between the first frame <NUM> and the second frame <NUM>. One end that is of each of the two frames and that is connected to the rotating shaft assembly <NUM> serves as an articulated end, and one end that is of the frame and that is away from the rotating shaft assembly <NUM> serves as a free end. The free ends of the two frames may rotate around the rotating shaft assembly <NUM>, so that an overall structure of the foldable screen device is in an opened or closed state.

Specifically, <FIG> is a schematic exploded view of the rotating shaft assembly of the foldable screen device according to this application. The rotating shaft assembly shown in <FIG> includes a connection structure <NUM> and two hinges <NUM> connected to the connection structure <NUM>. Each hinge <NUM> includes two rotating shafts <NUM> disposed in parallel and a plurality of articulated arms <NUM> correspondingly connected to the rotating shafts <NUM>. One end of the articulated arm <NUM> is articulated to the rotating shaft, and the other end of the articulated arm <NUM> is configured to be fixedly connected to a corresponding frame. Driven by the connections of the articulated arms <NUM>, the first frame <NUM> and the second frame <NUM> may respectively rotate around the corresponding rotating shafts <NUM>. In this way, the two rotating shafts <NUM> are disposed in parallel, and different frames are correspondingly connected to different rotating shafts <NUM>, so that the two frames of the foldable screen device can be folded and unfolded at relatively large angles.

To implement a connection between and positioning of the hinge <NUM> and the connection structure <NUM>, the hinge <NUM> further includes a support <NUM>. The support <NUM> supports and is disposed between the connection structure <NUM> and the rotating shaft <NUM>, and the rotating shaft <NUM> can freely rotate relative to the support <NUM>. For example, the support <NUM> may be in a form of a support rib. In addition, an overall structure of the rotating shaft assembly <NUM> may further have a plurality of different shapes and types. For a specific shape of the rotating shaft assembly <NUM>, refer to a rotating shaft support structure commonly used by a person skilled in the art.

<FIG> is a schematic diagram of a position of the rotating shaft assembly when the foldable screen device in <FIG> is in an unfolded state. <FIG> is a schematic diagram of a position of the rotating shaft assembly when the foldable screen device in <FIG> is in a folded state. As shown in <FIG> and <FIG>, it can be easily seen that, when the rotating shaft assembly <NUM> is connected to the first frame <NUM> and the second frame <NUM>, and a closing or opening operation is performed, the first frame <NUM> and the second frame <NUM> respectively rotate around the two rotating shafts <NUM> inside the rotating shaft assembly <NUM>. In this case, the overall structure of the rotating shaft assembly <NUM> does not undergo folding or other deformation, that is, the entire rotating shaft assembly <NUM> undergoes only a posture change, and does not undergo deformation such as folding. Components other than the rotating shafts <NUM> inside the rotating shaft assembly <NUM> do not generate relative rotation or other relative displacement. Therefore, the rotating shaft assembly <NUM> may serve as a whole, and an internal structure of the rotating shaft assembly <NUM> is used to assist in positioning and fixing the electrical connection line <NUM> or another component.

The two hinges <NUM> in the rotating shaft assembly <NUM> may be respectively located at two ends of the connection structure <NUM>, and no rotating shaft <NUM> or another rotatable component is disposed in a middle region of the connection structure <NUM>. Therefore, a static accommodation space may be formed in the middle region of the connection structure <NUM>, and a component fastened by the rotating shaft assembly <NUM> may pass through and be accommodated in the middle region of the connection structure <NUM>, and is not interfered by a structure such as the rotating shaft <NUM> during rotation. A person skilled in the art may understand that the static accommodation space formed in the connection structure <NUM> may also be located at another position of the connection structure <NUM>, for example, in an end region of the connection structure <NUM>. The following mainly uses a connection relationship between the middle region of the connection structure <NUM> in the rotating shaft assembly <NUM> and another component as an example for description. Unless otherwise specified, unrelated structures such as the articulated arms in the rotating shaft assembly <NUM> are omitted.

<FIG> is a schematic diagram of a connection between the rotating shaft assembly and the electrical connection line in the foldable screen device according to this embodiment of this application. As shown in <FIG>, to implement an electrical connection between primary circuit boards or flexible screens located in different frames, the electrical connection line <NUM> passes through the rotating shaft assembly <NUM> connected between the two frames. Specifically, the electrical connection line <NUM> passes through the middle region of the connection structure <NUM> of the rotating shaft assembly <NUM>, and two ends of the electrical connection line <NUM> are respectively connected and coupled to electrical connection points of the different frames, to implement conduction and signal transmission with the primary circuit boards, the processors, or other components located in the different frames. It can be known from the foregoing description that a portion that is of the electrical connection line <NUM> and that is accommodated inside the connection structure <NUM> is not interfered by the rotating shaft <NUM> during rotation.

However, to adapt to unfolding or folding of the foldable screen device, the electrical connection line <NUM> has a relatively long redundant length. When the foldable screen device is opened or closed, the first frame <NUM> and the second frame <NUM> rotate, and relative positions of the first frame <NUM> and the second frame <NUM> and relative distances between the electrical connection points also change accordingly. To avoid large deformation and position change of the excessively long electrical connection line <NUM> when the frames rotate, a positioning component for positioning the electrical connection line <NUM> may be disposed on the connection structure <NUM> of the rotating shaft assembly <NUM>.

In <FIG>, a specific connection relationship between the connection structure <NUM> and the electrical connection line <NUM> is further described in detail.

<FIG> is a schematic structural diagram of the connection structure in the foldable screen device in a first direction according to this embodiment of this application. <FIG> is a schematic exploded view of the connection structure in <FIG>. <FIG> is a schematic structural diagram of the connection structure in the foldable screen device in a second direction according to this embodiment of this application. <FIG> is a schematic exploded view of the connection structure in <FIG>. In <FIG>, a general structure of the connection structure <NUM> in the rotating shaft assembly <NUM> is first described. Specifically, as shown in <FIG>, the connection structure <NUM> in the rotating shaft assembly <NUM> may include components such as a first shaft cover <NUM>, a second shaft cover <NUM>, and a positioning piece <NUM>. The first shaft cover <NUM> and the second shaft cover <NUM> each are close to the articulated ends of the frames, and are clamped between the two frames. The first shaft cover <NUM> and the second shaft cover <NUM> are directly connected or indirectly connected by using another component, and the first shaft cover <NUM> and the second shaft cover <NUM> are relatively fastened. Two opposite sides of each of the first shaft cover <NUM> and the second shaft cover <NUM> are respectively connected to the two frames. The first direction and the second direction are two opposite directions. For example, the first direction is an inside-out direction of the rotating shaft assembly <NUM>, and the second direction is an outside-in direction of the rotating shaft assembly <NUM>.

It can be known from the foregoing that the first shaft cover <NUM> and the second shaft cover <NUM> in the rotating shaft assembly <NUM> have determined relative positions. Therefore, the first shaft cover <NUM> and the second shaft cover <NUM> may be used together to install and fasten the positioning piece <NUM>.

Specifically, both the first shaft cover <NUM> and the second shaft cover <NUM> may be thin shell-shaped or thin plate-shaped components, and may be disposed in approximately parallel to each other. For example, in this embodiment, both the first shaft cover <NUM> and the second shaft cover <NUM> are the plate-shaped components, and plate surface extension directions of the first shaft cover <NUM> and the second shaft cover <NUM> are kept parallel to or approximately parallel to the rotating shaft <NUM>. Plate surfaces of the first shaft cover <NUM> and the second shaft cover <NUM> may extend to have lengths approximately equal to widths of the frames. In this way, the first shaft cover <NUM> and the second shaft cover <NUM> may serve as main components of a positioning structure in the rotating shaft assembly <NUM>, to support other structures of the rotating shaft assembly <NUM> in a length direction of the entire rotating shaft <NUM>, or may serve as an exterior part of the rotating shaft assembly <NUM>, to shield a gap formed when the two adjacent frames relatively rotate during folding and deformation of the foldable screen device.

The second shaft cover <NUM> is disposed on an outer side of the rotating shaft assembly <NUM>, namely, on a side close to the articulated end of the frame; and the first shaft cover <NUM> is disposed on an inner side of the rotating shaft assembly <NUM>, namely, on a side that is of the second shaft cover <NUM> and that faces the free end of the frame. In this case, the first shaft cover <NUM> is hidden inside the rotating shaft assembly <NUM>. When the frame of the foldable screen device rotates, the second shaft cover <NUM> is exposed to an outer side of the articulated end of the frame, to form an exterior part of the rotating shaft assembly <NUM>. Correspondingly, when the second shaft cover <NUM> serves as the exterior part, a cross section of the second shaft cover <NUM> in a direction perpendicular to the rotating shaft <NUM> may be an arc, so that a side profile of the foldable screen device is beautiful.

In the rotating shaft assembly <NUM>, there is a specific spacing between the first shaft cover <NUM> and the second shaft cover <NUM>, to form an accommodation space between the first shaft cover <NUM> and the second shaft cover <NUM>, and the positioning piece <NUM> may be disposed in the accommodation space and cooperate with other components of the rotating shaft assembly <NUM> to position the electrical connection line <NUM>.

The first shaft cover <NUM> and the second shaft cover <NUM> jointly form the accommodation space, and the electrical connection line <NUM> is accommodated inside the accommodation space. Therefore, the electrical connection line <NUM> is shielded and protected by the first shaft cover <NUM> and the second shaft cover <NUM>. In this way, structure reliability is relatively high, and appearance is relatively good.

<FIG> is a schematic diagram of a partial cross section of the connection structure in the foldable screen device according to this embodiment of this application. As shown in <FIG>, to position the electrical connection line <NUM>, the positioning piece <NUM> in the rotating shaft assembly <NUM> is fastened between the first shaft cover <NUM> and the second shaft cover <NUM>. The positioning piece <NUM> and the first shaft cover <NUM> jointly clamp the electrical connection line <NUM> between the positioning piece <NUM> and the first shaft cover <NUM>, and restrict the electrical connection line <NUM> to some extent. In this case, the positioning piece <NUM> and the first shaft cover <NUM> jointly form a positioning point located at the middle segment of the electrical connection line <NUM>. Compared with that in an existing electrical connection line <NUM> that is connected to frames only depending on two ends and whose middle segment is in a free-bending suspended state, in this application, positions of the middle segment and the end parts of the electrical connection line <NUM> are all positioned, so that a length of a part that can be freely bent and that is of the electrical connection line <NUM> is reduced, and correspondingly, a bending deformation amplitude is also reduced. In addition, because the rotating shaft assembly <NUM> is located between the two frames, the positioning point formed by the rotating shaft assembly <NUM> also divides, in a length direction, the entire electrical connection line <NUM> into two segments with similar lengths. The two segments of the electrical connection lines <NUM> have relatively similar bending deformation amounts, and generate synchronous deformation and displacement. In this way, the electrical connection line <NUM> positioned with the aid of the rotating shaft assembly <NUM> generates small bending deformation when the foldable screen device is folded, and a bending amount is prone to control. Therefore, connection reliability is high.

When the first shaft cover <NUM> is fixed relative to the positioning piece <NUM>, the positioning piece <NUM> may be fixedly connected only to the first shaft cover <NUM>, or the first shaft cover <NUM> and the second shaft cover <NUM> may jointly fasten the positioning piece <NUM>. The positioning piece <NUM> may have different structures according to different connection manners. In this embodiment, an example in which the first shaft cover <NUM> and the second shaft cover <NUM> jointly fasten the positioning piece <NUM> is used to specifically describe manners of fastening and connecting the positioning piece <NUM> in the rotating shaft assembly <NUM>.

<FIG> is a schematic diagram of a cross section of the connection structure in the foldable screen device according to this embodiment of this application. <FIG> is a schematic structural diagram of the connection structure in the foldable screen device according to this embodiment of this application. As shown in <FIG> and <FIG>, the first shaft cover <NUM> and the second shaft cover <NUM> jointly form an accommodation space, and the positioning piece <NUM> may be installed in the accommodation space. A structure on one side of the positioning piece <NUM> is installed on a surface that is of the first shaft cover <NUM> and that faces the second shaft cover <NUM>, and a structure on the other side of the positioning piece <NUM> may press against an inner surface of the second shaft cover <NUM>. The electrical connection line <NUM> is clamped between the positioning piece <NUM> and the first shaft cover <NUM>. In <FIG>, to facilitate observation of the connection structure <NUM>, the second shaft cover <NUM> is hidden. A person skilled in the art may clearly know a position and a connection relationship of the second shaft cover <NUM> relative to another component of the connection structure <NUM> with reference to other accompanying drawings.

When the connection structure <NUM> in the rotating shaft assembly <NUM> is configured to position the electrical connection line <NUM>, a specific position relationship between the connection structure <NUM> and the electrical connection line <NUM> may be shown in <FIG>. <FIG> is a schematic exploded view of the connection structure in <FIG>. <FIG> is a schematic structural diagram of the connection structure in the foldable screen device in another direction according to this embodiment of this application. <FIG> is a schematic exploded view of the connection structure in <FIG>. Similar to <FIG>, to facilitate observation of the connection structure <NUM>, the first shaft cover <NUM> and the second shaft cover <NUM> are hidden in <FIG>. A person skilled in the art may clearly know positions and connection relationships of the first shaft cover <NUM> and the second shaft cover <NUM> relative to other components of the connection structure <NUM> with reference to other accompanying drawings.

As shown in <FIG>, the electrical connection line <NUM> including a flexible printed circuit board <NUM>, a cable <NUM> and the like is located between the positioning piece <NUM> and the first shaft cover <NUM>, and the positioning piece <NUM> is located between the first shaft cover <NUM> and the second shaft cover <NUM>. Mutual matching structures and specific connection manners between the positioning piece <NUM>, the first shaft cover <NUM>, and the second shaft cover <NUM> have been described in detail in the foregoing implementations, and details are not described herein again.

It should be noted that, when the positioning piece <NUM> and the first shaft cover <NUM> jointly position the electrical connection line <NUM>, the positioning piece <NUM> and the first shaft cover <NUM> do not need to clamp two opposite sides of the electrical connection line <NUM>, but only need to jointly define a space for positioning the electrical connection line <NUM>, to limit the electrical connection line <NUM> in the space. In this case, a channel through which the electrical connection line <NUM> can pass is actually formed between the positioning piece <NUM> and the first shaft cover <NUM>. The channel has two opposite side channel walls formed by the positioning piece <NUM> and the first shaft cover <NUM> respectively, and two ends of the channel are respectively connected to space inside the two frames. Therefore, the electrical connection line <NUM> can enter the channel from one of the frames, and extend to the other frame through the channel. When a part that is of the electrical connection line <NUM> and that is located between the positioning piece <NUM> and the first shaft cover <NUM> tends to bend and deform, the part is limited by the channel walls, that is, the part is limited only in a region inside the channel, and cannot be greatly bent out of the channel.

In this case, the positioning piece <NUM> and the first shaft cover <NUM> clamp the electrical connection line <NUM> in a Z-axis direction. Therefore, a clamped part of the electrical connection line <NUM> is constrained in the Z-axis direction, and a large amplitude of bending displacement cannot be generated. Constrained by the positioning piece <NUM> and end parts of the electrical connection line <NUM>, a bending deformation amplitude of a part that is of the electrical connection line <NUM> and that is not clamped by the positioning piece <NUM> is also largely reduced, and overall displacement and a deformation amount of the electrical connection line <NUM> are controlled.

It may be understood that, because the connection structure <NUM> and components such as the hinges <NUM> in the rotating shaft assembly <NUM> are located at different positions in an axial direction of the rotating shaft <NUM>, the channel formed by the connection structure <NUM> and components such as the hinges <NUM> used to be connected to the frames may also be located at different positions in the axial direction of the rotating shaft <NUM>. In this way, when structures such as the articulated arm <NUM> in the hinge <NUM> drives the frame to rotate around the rotating shaft <NUM>, components such as the positioning piece <NUM> and the first shaft cover <NUM> that form the channel still have relatively static positions, the channel does not deform or change in another state due to rotation of the rotating shaft <NUM>, and a structure of the channel is relatively stable and reliable.

To further assist in fastening the electrical connection line <NUM> and reduce installation difficulty between the positioning piece <NUM> and the electrical connection line <NUM>, the electrical connection line <NUM> may be pre-positioned on the rotating shaft assembly <NUM> by using an attraction force between magnetic pieces or other pieces that can be attracted with each other.

Specifically, it can be known from the foregoing content that the first shaft cover <NUM> and the positioning piece <NUM> in the rotating shaft assembly <NUM> jointly clamp and position the electrical connection line <NUM>, and therefore, a first magnetic piece <NUM> and a second magnetic piece <NUM> that can be attracted with each other may be disposed. At least one of the first magnetic piece <NUM> and the second magnetic piece <NUM> is relatively fastened to the entire rotating shaft assembly <NUM>. The first magnetic piece <NUM> and the second magnetic piece <NUM> are located on the two opposite sides of the electrical connection line <NUM>. In this way, the electrical connection line <NUM> is pre-positioned on the rotating shaft assembly <NUM> by using the mutual attraction force of the first magnetic piece <NUM> and the second magnetic piece <NUM>.

The first magnetic piece <NUM> and the second magnetic piece <NUM> may be made of a permanent magnetic material or a soft magnetic material. Optionally, one of the first magnetic piece <NUM> and the second magnetic piece <NUM> may be a magnet, and the other may be a soft magnet. For example, the first magnetic piece <NUM> is a magnet, and the second magnetic piece <NUM> is a soft magnet; or the first magnetic piece <NUM> is a soft magnet, and the second magnetic piece <NUM> is a magnet. Alternatively, in another optional manner, both the first magnetic piece <NUM> and the second magnetic piece <NUM> may be magnets, and the first magnetic piece <NUM> and the second magnetic piece <NUM> have opposite polarities. The soft magnet may be a magnetizable iron part, a steel part, or the like.

When the first magnetic piece <NUM> and the second magnetic piece <NUM> are configured to assist in positioning the electrical connection line <NUM>, the first magnetic piece <NUM> and the second magnetic piece <NUM> may have a plurality of different installation positions. When the rotating shaft assembly <NUM> is assembled, the first shaft cover <NUM> and another main body structure of the rotating shaft assembly <NUM> need to be assembled and serve as an installation reference, and then structures such as the electrical connection line <NUM>, the positioning piece <NUM>, and the second shaft cover <NUM> are installed in sequence. Therefore, the first magnetic piece <NUM> or the second magnetic piece <NUM> is installed on the first shaft cover <NUM>.

In an optional installation manner, the first magnetic piece <NUM> may be disposed on the first shaft cover <NUM>, and the second magnetic piece <NUM> is located on the positioning piece <NUM>. Because the positioning piece <NUM> and the first shaft cover <NUM> are located on different sides of the electrical connection line <NUM>, the positioning piece <NUM> and the first shaft cover <NUM> can directly clamp the electrical connection line <NUM> by using a magnetic force, provided that the positioning piece <NUM> and the first shaft cover <NUM> are close to each other, to complete pre-positioning of components such as the electrical connection line <NUM> and the positioning piece <NUM>. After assembly of the electrical connection line <NUM> and the positioning piece <NUM> is completed, the first magnetic piece <NUM> and the second magnetic piece <NUM> may also depend on the mutually attracted magnetic force, to generate, between the positioning piece <NUM> and the first shaft cover <NUM>, torques that are close to each other, to assist in positioning the electrical connection line <NUM>.

However, because a part of the electrical connection line <NUM> may exist in a form of a flat cable and has a relatively large width and a relatively large coverage area, in another optional installation manner, the electrical connection lines <NUM> may be used to carry the magnetic pieces. Specifically, the first magnetic piece <NUM> may be disposed on the first shaft cover <NUM>, and the second magnetic piece <NUM> is disposed on the electrical connection line <NUM>. In this way, the second magnetic piece <NUM> and the first magnetic piece <NUM> may be attracted with each other, and are positioned on the first shaft cover <NUM> together with the electrical connection line <NUM>. In this installation manner, the electrical connection line <NUM> can be pre-positioned on the first shaft cover <NUM> without participation of the positioning piece <NUM>.

In this installation manner, the second magnetic piece <NUM> may be specifically disposed on the electrical connection line <NUM> in a plurality of manners. Optionally, the second magnetic piece <NUM> may be disposed on a plate surface of the electrical connection line <NUM> in a bonding manner or the like, to be integrated with the electrical connection line <NUM>; or a bearing structure that can carry the second magnetic piece <NUM> is disposed on the electrical connection line <NUM>, and the second magnetic piece <NUM> is installed in the bearing structure, to implement relative positioning of the electrical connection line <NUM> and the second magnetic piece <NUM>.

It should be noted that, in the foregoing installation manners, because the first magnetic piece <NUM> and the second magnetic piece <NUM> can be attracted with each other without being in contact with each other, the first magnetic piece <NUM> and the second magnetic piece <NUM> may be disposed at different positions on the first shaft cover <NUM>, the positioning piece <NUM>, and the electrical connection line <NUM>, provided that the first magnetic piece <NUM> and the second magnetic piece <NUM> have relative positions and the positioning piece <NUM> and the first shaft cover <NUM> can be close to each other by using a magnetic force between the first magnetic piece <NUM> and the second magnetic piece <NUM>. In addition, for ease of installation, the first magnetic piece <NUM> and the second magnetic piece <NUM> may have relatively regular shapes. For example, both the first magnetic piece <NUM> and the second magnetic piece <NUM> may be in a shape of a cuboid.

In addition, the first magnetic piece <NUM> and the first shaft cover <NUM>, or the second magnetic piece <NUM> and the positioning piece <NUM> may alternatively form an integrated structure. In this case, the connection structure <NUM> actually includes only the first magnetic piece <NUM> or only the second magnetic piece <NUM>. Correspondingly, the entire positioning piece <NUM> or the entire first shaft cover <NUM> is made of a soft magnet. For example, the first magnetic piece <NUM> is disposed on the first shaft cover <NUM>, the first magnetic piece <NUM> is a magnet, and the entire positioning piece <NUM> is a soft magnet that can be attracted by the magnet. Alternatively, the second magnetic piece <NUM> is disposed on the positioning piece <NUM>, the second magnetic piece <NUM> is a magnet, and the first shaft cover <NUM> is made of a soft magnet. In this way, a structure of the first shaft cover <NUM> or the positioning piece <NUM> can be simplified, and manufacturing difficulty can be reduced.

In this way, by using the magnetic force of the magnetic pieces, the electrical connection line <NUM> may be disposed on an assembly component in advance in an assembly process of the rotating shaft assembly <NUM>, to prevent the electrical connection line <NUM> from being detached from an assembly position due to external pulling or other forces, and effectively reduce assembly difficulty. In addition, by using an attraction function of the magnetic pieces, the first shaft cover <NUM> and the positioning piece <NUM> can clamp tightly, or the electrical connection line <NUM> can be attached to the first shaft cover <NUM>, to assist in positioning the electrical connection line <NUM>.

To complete connection between components inside the connection structure, in addition to the magnetic piece, there is also a structure that can be relatively matched between the components. <FIG> is a schematic diagram of a structure of the first shaft cover in the foldable screen device according to this embodiment of this application. As shown in <FIG>, the first shaft cover <NUM> may occupy an entire length direction of the rotating shaft assembly <NUM>, to serve as a connection basis between the connection structure <NUM> and the hinge <NUM>. The positioning piece <NUM> and the second shaft cover <NUM> may be assembled by using the first shaft cover <NUM> as a positioning and assembly reference. Specifically, the first shaft cover <NUM> includes a first fixing surface <NUM> located in the middle region of the first shaft cover <NUM> and connection rods <NUM> located in end regions. The connection rod <NUM> may be configured to be connected to the hinge <NUM> or another structure, and the first fixing surface <NUM> may be configured to arrange the positioning piece <NUM>. To enable the rotating shaft assembly <NUM> to evenly bear a force, the connection rods <NUM> are symmetrically distributed in a length direction of the first shaft cover <NUM>.

In addition, to install the first magnetic piece <NUM> on the first shaft cover <NUM>, a first installation slot <NUM> may be provided on the first fixing surface <NUM> of the first shaft cover <NUM>. Both a shape and a size of the first installation slot <NUM> match those of the first magnetic piece <NUM>, so that the first magnetic piece <NUM> can be accommodated in the first installation slot <NUM>. Optionally, the first installation slot <NUM> may be connected to the first magnetic piece <NUM> by using a bonding agent or in a manner of interference fit or the like.

<FIG> is a schematic diagram of a structure of the second shaft cover in the foldable screen device according to this embodiment of this application. As shown in <FIG>, the second shaft cover <NUM> extends in an entire length direction of the rotating shaft assembly <NUM>, which is similar to that of the first shaft cover <NUM>. An inner surface of the second shaft cover <NUM> is in an arc shape.

To be connected to the first shaft cover <NUM> and the second shaft cover <NUM>, the positioning piece <NUM> has a corresponding matching connection structure. <FIG> is a schematic diagram of a front structure of the positioning piece in the foldable screen device according to this embodiment of this application. <FIG> is a schematic diagram of a back structure of the positioning piece <NUM> in a terminal device according to this embodiment of this application. As shown in <FIG>, in an optional implementation, a first positioning part <NUM> is disposed on a side that is of the positioning piece <NUM> and that is close to the first shaft cover <NUM>, and the first positioning part <NUM> may be connected to the first shaft cover <NUM>, so that the positioning piece <NUM> and the first shaft cover <NUM> have fixed relative positions. A second positioning part <NUM> is disposed on a side that is of the positioning piece <NUM> and that is close to the second shaft cover <NUM>, and the second positioning part <NUM> may be connected to the second shaft cover <NUM>, so that the positioning piece <NUM> and the second shaft cover <NUM> have fixed relative positions.

Because the positioning piece <NUM> is located between the first shaft cover <NUM> and the second shaft cover <NUM>, the first shaft cover <NUM> and the second shaft cover <NUM> may jointly clamp the positioning piece <NUM> between the first shaft cover <NUM> and the second shaft cover <NUM>. In this case, both the first positioning part <NUM> and the second positioning part <NUM> may have structures such as positioning rods or positioning protrusions, and the first positioning part <NUM> and the second positioning part <NUM> respectively press against opposite surfaces of the first shaft cover <NUM> or the second shaft cover <NUM>, so that the positioning piece <NUM> is firmly clamped between the first shaft cover <NUM> and the second shaft cover <NUM>.

Specifically, as shown in <FIG>, the first positioning part <NUM> of the positioning piece <NUM> protrudes outward from a main body of the positioning piece <NUM>, and a height of the top of the first positioning part <NUM> is greater than a height of another part on the side surface of the positioning piece <NUM>. Therefore, when the first positioning part <NUM> is connected to the first shaft cover <NUM>, a gap is formed between the main body of the positioning piece <NUM> and the first shaft cover <NUM>. The gap may be used to allow penetration of the electrical connection line <NUM>.

In the structure of the positioning piece, to enable the positioning piece <NUM> and the first shaft cover <NUM> to jointly clamp and position the electrical connection line <NUM>, in an optional manner, a side that is of the main body of the positioning piece <NUM> and that faces the first shaft cover <NUM> further has a second fixing surface <NUM>, and a gap for allowing penetration of the electrical connection line <NUM> is formed between the second fixing surface <NUM> and the first shaft cover <NUM>, so that the electrical connection line <NUM> can be clamped in a region between the first shaft cover <NUM> and the second fixing surface <NUM>. However, a position of a part that is of the electrical connection line <NUM> and that is clamped by the positioning piece <NUM> and the first shaft cover <NUM> is limited, and this part cannot generate a large amplitude of bending and deformation with rotation of the frame.

In this case, because the positioning piece <NUM> is connected to the first shaft cover <NUM> by using the first positioning part, the first positioning part protrudes toward the outer side of the second fixing surface <NUM> until the first positioning part presses against a corresponding part of the first shaft cover <NUM>. To keep a spacing between each part of the second fixing surface <NUM> and the first shaft cover <NUM>, there may be a plurality of first positioning parts <NUM> distributed at different positions of the main body of the positioning piece <NUM>. In this embodiment, there are two first positioning parts <NUM>, and the two first positioning parts <NUM> are disposed on two opposite sides of the main body of the positioning piece <NUM>. To reduce impact of the first positioning parts on the second fixing surface <NUM> while maintaining the spacing between the second fixing surface <NUM> and the first shaft cover <NUM>, there is a relatively large spacing between the plurality of first positioning parts <NUM>, and the first positioning parts <NUM> each may have a relatively small cross-sectional area. In this way, the second fixing surface <NUM> may have a relatively large area. The first positioning part <NUM> may be in a convex column form.

To be relatively fastened to the second shaft cover <NUM>, the positioning piece <NUM> further includes a second positioning part <NUM>. The second positioning part <NUM> may be of a structure such as a protrusion, and may press against an inner surface of the second shaft cover <NUM>. In this case, the top of the protrusion may be in an arc shape matching a shape of the inner surface of the second shaft cover <NUM>. In this way, the top of the second positioning part <NUM> firmly presses against the inner surface of the second shaft cover <NUM> and is positioned.

Similar to the first positioning part <NUM>, there may also be a plurality of second positioning parts <NUM>, which are distributed at different positions of the positioning piece <NUM>. In this embodiment, there may also be two second positioning parts <NUM>, and the two second positioning parts <NUM> are respectively disposed at two end positions in a length direction of the positioning piece <NUM>. In this way, through connection of the second positioning parts <NUM> at different positions, the positioning piece <NUM> and the second shaft cover <NUM> can be reliably positioned.

To prevent the electrical connection line <NUM> from being detached from the region between the positioning piece <NUM> and the first shaft cover <NUM>, a structure that limits horizontal (namely, a Y-axis direction in the figure) movement of the electrical connection line <NUM> may be disposed on the positioning piece <NUM>. For example, the positioning piece <NUM> may limit a transverse position of the electrical connection line <NUM> by using a structure such as a positioning protrusion. As shown in <FIG>, as an optional structure, a third positioning part <NUM> may be disposed on the main body of the positioning piece <NUM>. When the electrical connection line <NUM> is disposed between the positioning piece <NUM> and the first shaft cover <NUM>, the third positioning part <NUM> is located on a side of the electrical connection line <NUM>, to prevent the electrical connection line <NUM> from moving toward the third positioning part <NUM> on the side of the electrical connection line <NUM>.

The third positioning part <NUM> may be of a structure such as a protrusion protruding from the second fixing surface <NUM>. In this way, the electrical connection line <NUM> is constrained by a side wall of the third positioning part <NUM>, and therefore, movement in a direction parallel to the second fixing surface <NUM> (a Y-axis direction in the figure) is blocked. There may be one or a plurality of third positioning parts <NUM>. For example, there may be two third positioning parts <NUM>, and the two third positioning parts <NUM> are disposed on different sides of the electrical connection line <NUM>, to respectively constrain movements of the electrical connection line <NUM> in directions in which the two third positioning parts <NUM> are located. In addition, because a main body of the positioning piece <NUM> needs to be connected to the first shaft cover <NUM> by using the first positioning part <NUM>, the third positioning parts <NUM> may cooperate with the first positioning part <NUM> to perform horizontal positioning on the electrical connection line <NUM>. In this case, provided that the third positioning parts <NUM> are located on one side of the electrical connection line <NUM>, and the other side of the electrical connection line <NUM> is the first positioning part <NUM>, the first positioning part <NUM> and the third positioning parts <NUM> can jointly constrain a transverse position of the electrical connection line <NUM>.

To improve a limiting effect of the third positioning part <NUM>, the third positioning part <NUM> may extend in a length direction of the electrical connection line <NUM>, to position different parts of the electrical connection line <NUM> in the length direction.

In addition, it may be understood that, to fasten a magnetic piece to the positioning piece <NUM>, the positioning piece <NUM> is provided with a second installation slot <NUM>. Both a size and a shape of the second installation slot <NUM> match those of the second magnetic piece <NUM>, so that the second magnetic piece <NUM> is fastened to the positioning piece <NUM>. Specifically, the second installation slot <NUM> may be located on a surface that is of the positioning piece <NUM> and that faces the first shaft cover <NUM>, namely, the second fixing surface <NUM>. In addition, the second magnetic piece <NUM> may be connected to the second installation slot <NUM> through bonding or in a manner of interference fitting or the like.

In addition, the first shaft cover <NUM> or the second shaft cover <NUM> may have a structure matching the positioning piece <NUM>. For example, on one or two of the first shaft cover <NUM> and the second shaft cover <NUM>, a structure whose shape matches a shape of the first positioning part <NUM> or the second positioning part <NUM> may be disposed, for example, a groove or a positioning hole (not shown in the figure). In this way, the first positioning part or the second positioning part may be inserted into the groove or the positioning hole, to complete fastening of the positioning piece <NUM> relative to the first shaft cover <NUM> and the second shaft cover <NUM>.

In addition, it may be understood that, in another optional manner, the positioning piece <NUM> may alternatively be connected and fastened only to the first shaft cover <NUM>. In this case, the positioning piece <NUM> may be connected to the first shaft cover <NUM> in a manner such as a clamping manner.

A person skilled in the art easily understands that, in addition to manners such as clamping and abutting, the positioning piece <NUM> may also be connected and fastened to the first shaft cover <NUM>, the second shaft cover <NUM>, or another structure of the rotating shaft assembly <NUM> by using a threaded fastener or in a manner such as a bonding manner. Other connection manners of the positioning piece <NUM> in the connection structure <NUM> are not described herein.

When the foldable screen device is folded, with relative rotation of the two frames, the electrical connection line <NUM> may also move in a length direction of the electrical connection line <NUM>, that is, the electrical connection line <NUM> slides relative to the positioning piece <NUM> in an X-axis direction. In this way, a relatively large length difference may exist between lengths of parts that are of the electrical connection line <NUM> and that are located on two sides of the positioning piece <NUM>, and a relatively long part may still generate a large amplitude of bending deformation. To reduce or avoid sliding of the electrical connection line <NUM> relative to the positioning piece <NUM> in the length direction, a corresponding limiting structure may be disposed on the positioning piece <NUM>.

When the limiting structure of the positioning piece <NUM> limits the sliding of the electrical connection line <NUM>, specifically, different parts or segments of the electrical connection line <NUM> may have different extension directions by using a bending and deformation feature of the electrical connection line <NUM> through limiting and guiding the limiting structure. When the electrical connection line <NUM> is affected by an external force to generate a moving trend in the length direction of the electrical connection line <NUM>, a length direction of each part of the electrical connection line <NUM> extending in different directions is inconsistent with a direction of the external force. In this way, a specific friction force and resistance are correspondingly generated between the electrical connection line <NUM> and another structure on the side with the external force, so that the external force for driving the electrical connection line <NUM> to move is increased, and the moving trend of the electrical connection line <NUM> in the length direction is slowed down or even eliminated.

The electrical connection line <NUM> may include a plurality of different types such as a flexible printed circuit board <NUM> and a single cable <NUM>. For different types of electrical connection lines <NUM>, different limiting structures may be used on the positioning piece <NUM> to position the electrical connection line <NUM>. The following separately describes in detail limiting structures of the positioning piece <NUM> by using examples in which the limiting structures position the flexible printed circuit board <NUM> and the single cable <NUM>.

When the limiting structure positions the flexible printed circuit board <NUM>, the entire flexible printed circuit board <NUM> is of a bendable thin board structure, has a relatively large width and length, but has a relatively small size in a thickness direction of the flexible printed circuit board <NUM>, namely, a direction perpendicular to aboard surface direction of the flexible printed circuit board <NUM>. Therefore, to reduce a size of the limiting structure, when the limiting structure of the positioning piece <NUM> further limits the flexible printed circuit board <NUM>, the limiting structure of the positioning piece <NUM> may limit and fasten the flexible printed circuit board <NUM> in the direction perpendicular to the board surface direction of the flexible printed circuit board <NUM>.

Specifically, the limiting structure of the positioning piece <NUM> may be located on one side of a board surface of the flexible printed circuit board <NUM>, so that the flexible printed circuit board <NUM> is bent to some extent, and a bending direction is perpendicular to the board surface direction of the flexible printed circuit board <NUM>. When the flexible printed circuit board <NUM> has a bent part perpendicular to the board surface direction, an extension direction of the bent part of the flexible printed circuit board <NUM> is different from an entire length direction of the flexible printed circuit board <NUM>. Therefore, the limiting structure located outside the flexible printed circuit board <NUM> prevents the flexible printed circuit board <NUM> from moving in the entire length direction of the flexible printed circuit board <NUM>, so that the electrical connection line <NUM> is limited to an original position.

<FIG> is a schematic diagram of a connection between the connection structure and the flexible printed circuit board in the foldable screen device according to this embodiment of this application. As shown in <FIG>, in an optional implementation, both the first fixing surface <NUM> of the first shaft cover <NUM> and the second fixing surface <NUM> of the positioning piece <NUM> may be concave-convex surfaces, and concave and convex directions of the concave-convex surfaces face a thickness direction of the flexible printed circuit board <NUM>. Because the positioning piece <NUM> and the first shaft cover <NUM> jointly clamp the flexible printed circuit board <NUM> between the positioning piece <NUM> and the first shaft cover <NUM>, the board surface of the flexible printed circuit board <NUM> presents a shape matching shapes of the first fixing surface <NUM> and the second fixing surface <NUM>, that is, the plate surface is also bent toward the thickness direction of the flexible printed circuit board <NUM> to form protrusions or recesses. In this way, the positioning piece <NUM> can fasten the flexible printed circuit board <NUM> in the length direction of the flexible printed circuit board <NUM> by using the second fixing surface <NUM> that has a concave-convex shape.

In this case, a channel having a concave-convex shape is formed between the positioning piece <NUM> and the first shaft cover <NUM>, and a corresponding concave-convex shape is also formed on the flexible printed circuit board <NUM> that passes through the channel. In this way, the flexible printed circuit board <NUM> is in contact with a concave-convex channel wall, and is blocked by the channel wall, to prevent the flexible printed circuit board <NUM> from moving forward and backward in the length direction of the flexible printed circuit board <NUM>.

Specifically, there may be one or a plurality of concave-convex shapes formed on the first fixing surface <NUM> of the first shaft cover <NUM> and the second fixing surface <NUM> of the positioning piece <NUM>. When the first fixing surface <NUM> and the second fixing surface <NUM> have the plurality of concave-convex shapes, the plurality of concave-convex shapes may be sequentially arranged in the length direction of the flexible printed circuit board <NUM>. In this way, the flexible printed circuit board <NUM> may be simultaneously limited by the plurality of concave-convex shapes, and correspondingly has a plurality of curved segments or bending segments. The plurality of curved segments or bending segments may work together to generate resistance, which has a relatively good positioning effect to the flexible printed circuit board <NUM> in the length direction.

When the first fixing surface <NUM> and the second fixing surface <NUM> have a plurality of concave-convex shapes, a shape and a size of the concave-convex shape are limited by bending performance of the flexible printed circuit board <NUM>. For example, a height of a protrusion or a depression in a single concave-convex shape is greater than a minimum bendable radius of the flexible printed circuit board <NUM>, to avoid damage or even rupture caused by excessive bending of the flexible printed circuit board <NUM>.

To simplify the structure of the positioning piece <NUM> and reduce manufacturing costs, the first fixing surface <NUM> of the first shaft cover <NUM> and the second fixing surface <NUM> of the positioning piece <NUM> may have relatively simple shapes. In this case, the first fixing surface <NUM> and the second fixing surface <NUM> each may have a convex or concave shape. The convex or concave shape matches a shape of a corresponding part on the first shaft cover <NUM>, so that the flexible printed circuit board <NUM> has an entire curved part or an entire bent part in a space formed between the second fixing surface <NUM> and the first shaft cover <NUM>, and the curved part presses against a convex or concave part of the second fixing surface <NUM>, to position the flexible printed circuit board <NUM> in the length direction. In this embodiment, an example in which the second fixing surface <NUM> has a concave shape and the first fixing surface <NUM> has a corresponding convex shape is used for description.

When the first fixing surface <NUM> and the second fixing surface <NUM> are concave-convex surfaces, optionally, the first fixing surface <NUM> and the second fixing surface <NUM> may generate a convex or concave shape in a straight-line bending manner. For example, as shown in <FIG>, the first fixing surface <NUM> has a plurality of straight-line bending segments 3111a, and the second fixing surface <NUM> also has a plurality of straight-line bending segments 3125a correspondingly. The straight-line bending segments 3111a of the first fixing surface <NUM> form a protrusion shape. Correspondingly, the straight-line bending segments 3125a of the second fixing surface <NUM> form a recess shape. In this way, shapes of the first fixing surface <NUM> and the second fixing surface <NUM> match each other, a bent channel is formed, and the channel protrudes to one side of the positioning piece <NUM>. In this way, a protrusion and a recess formed by bending a straight line may have a relatively large bending angle, and have a relatively good fastening effect on the flexible printed circuit board <NUM>.

In another optional structure, the second fixing surface <NUM> may be an arc-shaped surface, and the first fixing surface <NUM> that is of the first shaft cover <NUM> and that faces the second fixing surface <NUM> is also an arc-shaped surface. In this case, the first fixing surface <NUM> and the second fixing surface <NUM> each do not have a bending-angle structure such as an acute edge or a sharp angle. A part that is of the flexible printed circuit board <NUM> and that is in contact with the positioning piece <NUM> and a part that is of the flexible printed circuit board <NUM> and that is in contact with the first shaft cover <NUM> are arc surfaces with smooth transition. No fold or surface scratch is generated on the surface of the flexible printed circuit board <NUM> due to pressure of the acute edge.

In addition, the positioning piece <NUM> may further have another structure or shape used to position the flexible printed circuit board <NUM> in a length direction.

It should be noted that the electrical connection line <NUM> may include one or more flexible printed circuit boards <NUM>. When there is at least one flexible printed circuit board <NUM>, the plurality of flexible printed circuit boards <NUM> may be disposed in a top-down stacking manner, and are fastened together by the first shaft cover <NUM> and the positioning piece <NUM> in the rotating shaft assembly <NUM>.

In addition to the flexible printed circuit board <NUM>, the electrical connection line <NUM> may further include scattered cables <NUM>. Different from the flexible printed circuit board <NUM>, the cable <NUM> is usually disposed as a single cable. In this way, a radial size of the cable <NUM> is far less than a size of the cable <NUM> in a length direction. Therefore, when the positioning piece <NUM> is used to position the cable <NUM>, compared with the flexible printed circuit board <NUM>, the positioning piece <NUM> requires a more compact limiting structure.

Specifically, in an optional implementation, the second fixing surface <NUM> of the positioning piece <NUM> is provided with a guide groove <NUM>, and a cable segment that is of the cable <NUM> and that is located between the positioning piece <NUM> and the first shaft cover <NUM> may be partially or all buried in the guide groove <NUM>.

To position the cable <NUM> in the length direction of the cable <NUM> and reduce or avoid sliding of the cable <NUM> relative to the positioning piece <NUM> in the length direction, the guide groove <NUM> may correspondingly have a plurality of different guide groove shapes and structures, and cooperate with the cable <NUM> for positioning. The following specifically describes various possible forms of the guide groove <NUM> and corresponding limiting manners of the cable <NUM>.

<FIG> is a schematic diagram of a structure of the cable according to this embodiment of this application. As shown in <FIG>, in an optional implementation, a positioning structure may be disposed on an outer surface of the cable <NUM>. The positioning structure may cooperate with a corresponding structure of the guide groove <NUM>, so that the positioning piece <NUM> positions the cable <NUM> in a length direction of the cable <NUM>.

It may be understood that because the cable <NUM> is fastened in the guide groove <NUM> of the positioning piece <NUM>, a structure that matches the positioning structure of the cable <NUM> may be disposed in the guide groove <NUM>. Specifically, the positioning structure on the outer surface of the cable <NUM> may be an axial positioning protrusion <NUM>. The axial positioning protrusion <NUM> protrudes in a radial direction of the cable <NUM>.

<FIG> is a schematic diagram of a connection structure in a first direction when the positioning piece is connected to the cable according to this embodiment of this application. <FIG> is a schematic diagram of a connection structure in a second direction when the positioning piece is connected to the cable according to this embodiment of this application. As shown in <FIG>, specifically, the guide groove <NUM> may pass through the positioning piece <NUM> in a length extension direction of the cable <NUM>, a groove opening of the guide groove <NUM> faces the first shaft cover <NUM>, and openings of the guide groove <NUM> are formed in end surfaces of two opposite sides of the positioning piece <NUM>. The cable <NUM> may penetrate into the guide groove <NUM> through the two opposite openings. Slot walls on the two sides of the guide groove <NUM> may limit a radial position of the cable <NUM>. In this way, the cable <NUM> is constrained in the guide groove <NUM>.

Corresponding to the axial positioning protrusion <NUM> on the cable <NUM>, a recess part <NUM> corresponding to the axial positioning protrusion <NUM> may be disposed in the guide groove <NUM>. A shape and a position of the recess part <NUM> correspond to a shape and a position of the axial positioning protrusion <NUM>. When the cable <NUM> is disposed in the guide groove <NUM>, the axial positioning protrusion <NUM> of the cable <NUM> is located in the recess part <NUM>, and side walls of the recess part <NUM> may limit displacement of the cable <NUM> in a length direction.

The positioning structure of the cable <NUM> may have a plurality of different forms. Optionally, an injection-molded part may be used to form a positioning structure of the cable <NUM>. The injection-molded part may be formed on the outer surface of the cable <NUM> in an injection molding manner. In addition, strength of a connection between the injection-molded part and a main body of the cable <NUM> is relatively high, and a structure is relatively reliable. Furthermore, another material or component may be used to form a positioning structure on the outer surface of the cable <NUM>. This is not limited herein.

A person skilled in the art easily understands that, because the axial positioning protrusion <NUM> protrudes from the outer surface of the cable <NUM>, to accommodate the cable <NUM> having the axial positioning protrusion <NUM> inside the guide groove <NUM>, the guide groove <NUM> needs to have an avoidance notch <NUM> that is convenient to place the cable <NUM>.

A size and a shape of the avoidance notch <NUM> are adapted to a size and a shape of the cable <NUM> having the axial positioning protrusion <NUM>. Specifically, a size of the avoidance notch <NUM> in a radial direction of the cable <NUM> is greater than a maximum radial size of the cable <NUM> having the axial positioning protrusion <NUM>, so that the cable <NUM> can be placed into the guide groove <NUM> through the avoidance notch <NUM>. A position of the avoidance notch <NUM> may be opposite to or staggered from the recess part <NUM>. After entering the guide groove <NUM>, the cable <NUM> may move to a position at which the axial positioning protrusion <NUM> is matched and clamped with the recess part <NUM>, so that the cable <NUM> is positioned, as specifically shown in <FIG>.

In addition, a main body of the positioning piece <NUM> provided with the avoidance notch <NUM> and the guide groove <NUM> has a relatively complex shape and contour, and the positioning piece <NUM> may be integrally formed in a manner such as injection molding. Correspondingly, in an optional manner, the positioning piece <NUM> may be provided with an auxiliary hole <NUM>, and both the avoidance notch <NUM> and the recess part <NUM> are connected to the auxiliary hole <NUM>, so that a mold can extend into the avoidance notch <NUM> and the recess part <NUM> through the auxiliary hole <NUM>, to facilitate injection molding of the positioning piece <NUM>. For a specific shape and position of a structure such as the auxiliary hole <NUM>, refer to the foregoing illustration of the positioning piece <NUM>.

Optionally, the guide groove <NUM> may be bent toward a thickness direction of the flexible printed circuit board <NUM>. For example, the guide groove <NUM> may form a concave-convex shape similar to that of the second fixing surface <NUM>, to limit the cable <NUM> in the length direction of the cable <NUM>. Specifically, as shown in <FIG>, edges of the guide groove <NUM> are higher than a middle part of the guide groove <NUM>, so that steps 3123a are formed at the edges of the guide groove <NUM>. For a specific shape and structure of the step 3123a, refer to the foregoing diagram of the positioning piece <NUM>. When the guide groove <NUM> is bent toward the thickness direction of the flexible printed circuit board <NUM>, a specific structure of the concave-convex shape formed by the guide groove <NUM> is relatively similar to the concave-convex structure of the second fixing surface <NUM>. For details, refer to the foregoing description of the concave-convex structure of the second fixing surface <NUM>.

In another optional manner, the guide groove <NUM> may further separately limit the cable <NUM> in the length direction by using a bent shape. <FIG> is a schematic diagram of another connection structure when a positioning piece is connected to a cable according to an embodiment of this application. As shown in <FIG>, a guide groove <NUM> of a positioning piece <NUM> has at least one bending segment. A bending direction of the bending segment faces a radial direction of a cable <NUM>. The cable <NUM> disposed in the guide groove <NUM> forms a bending shape under pressure of groove walls of the guide groove <NUM>. When the cable <NUM> tends to move in a length direction of the cable <NUM>, the bending groove walls of the guide groove <NUM> may block movement of the cable <NUM>, so that the cable <NUM> is maintained at an original position. In addition, optionally, the bending direction of the guide groove <NUM> may protrude to a side of a flexible printed circuit board <NUM>. In this way, under a guiding effect of the guide groove <NUM>, an end part of the cable <NUM> extends to a side away from the flexible printed circuit board, thereby preventing interference between the cable <NUM> and the flexible printed circuit board <NUM>.

Different from the flexible printed circuit board <NUM> that has a relatively large width, the cable <NUM> has relatively small radial sizes in all directions. Therefore, the guide groove <NUM> may directly clamp the cable <NUM> inside the guide groove <NUM>, and limitation of the flexible printed circuit board <NUM> in an X-axis direction is completed without the need of cooperation between a second fixing surface <NUM> and a first shaft cover <NUM>. In this way, the guide groove <NUM> may have a uniform groove depth, and a groove width of a part between groove walls on two sides of the guide groove <NUM> may match an outer diameter of the cable <NUM>, so that the cable <NUM> is limited and fastened.

Specifically, refer to <FIG>. The entire guide groove <NUM> extends in a width direction (a Y-axis direction) of the positioning piece <NUM>, the guide groove <NUM> has the bending segment, and the bending segment is bent toward a length direction (an X-axis direction in the figure) of the positioning piece <NUM>. To achieve a better positioning effect for the cable <NUM>, the guide groove <NUM> in <FIG> has a plurality of bending segments that are sequentially connected. These bending segments guide a plurality of different segments of the cable <NUM> in different directions. The guide groove <NUM> causes relatively great resistance to the cable <NUM> to prevent the cable <NUM> from sliding relative to a cable groove in a length direction.

As shown in <FIG>, as an optional structure of the guide groove <NUM>, the bending segments of the guide groove <NUM> may be symmetrically disposed relative to a central axis of the positioning piece <NUM>. In this case, the central axis of the positioning piece <NUM> serves as a boundary, and the cable <NUM> is divided into two segments connected to different frames. The bending segments on different sides of the central axis impose close or even same resistance on the cable <NUM>. Therefore, when the cable <NUM> is bent and deforms, the cable segments on both sides of the positioning piece <NUM> are under a same stress and generate same deformation, and a case in which a segment of the cable <NUM> on one side of the positioning piece <NUM> generates large deformation while a segment of the cable <NUM> on the other side of the positioning piece <NUM> generates slight deformation is not generated.

When the guide groove <NUM> has a plurality of bending segments, smooth transition may be performed between the bending segments by using a curved surface, to prevent the cable <NUM> from being scratched due to sharp angles or acute edges of the guide groove <NUM>.

Similar to fastening of the flexible printed circuit board <NUM>, when the guide groove <NUM> limits the cable <NUM>, a bending angle and a bending radius formed by the bending segments are greater than a minimum bendable radius of the cable <NUM>, to avoid damage or break of the cable <NUM> located in the guide groove <NUM> due to an excessively large bending degree of the guide groove <NUM>.

When the positioning piece <NUM> and the first shaft cover <NUM> position the electrical connection line <NUM>, a bonding agent may be used to assist in positioning the flexible printed circuit board <NUM>, the cable <NUM>, and the like. In this case, a dispensing operation may be performed on a part that is of the flexible printed circuit board <NUM> or the cable <NUM> and that is in contact with the rotating shaft assembly <NUM>, and the flexible printed circuit board <NUM> or the cable <NUM> and the positioning piece <NUM> are fastened together by using a bonding force of the bonding agent.

The electrical connection line <NUM> may include both the flexible printed circuit board <NUM> and a cable <NUM> that is arranged in a single manner. To enable the positioning piece <NUM> to position both the flexible printed circuit board <NUM> and the single cable <NUM>, the guide groove <NUM> of the positioning piece <NUM> is located outside a region that is of the second fixing surface <NUM> and that is attached to the flexible printed circuit board <NUM>. In other words, regions that are of the guide groove <NUM> and the second fixing surface <NUM> and that are used to position the flexible printed circuit board <NUM> are disposed in parallel. Correspondingly, the flexible printed circuit board <NUM> and the single arranged cable <NUM> are also arranged in parallel.

To connect an end part of the electrical connection line <NUM> to a corresponding frame, the frame also has a fastening structure for fastening the electrical connection line <NUM>. In this way, determined relative positions exist between an end part of the electrical connection line <NUM> and the frame. No matter whether the frame rotates to any position, the end part of the electrical connection line <NUM> is reliably connected to the frame, and is electrically connected to a corresponding component such as a mainboard, an antenna, or a flexible screen in the frame.

The electrical connection line <NUM> may include different components such as the flexible printed circuit board <NUM> and the single cable <NUM>, and the flexible printed circuit board <NUM> and the single cable <NUM> have different structures and shapes. Therefore, for the flexible printed circuit board <NUM> and the cable <NUM>, the frame may fasten ends of the flexible printed circuit board <NUM> and the cable <NUM> by using different fastening structures.

<FIG> is a schematic diagram of a connection structure between the electrical connection line and the frame in the foldable screen device according to this embodiment of this application. <FIG> is a schematic exploded view of the connection structure between the electrical connection line and the frame in <FIG>. As shown in <FIG> and <FIG>, in an optional implementation, a reinforcement steel sheet <NUM> is disposed at an end part of the flexible printed circuit board <NUM>. The reinforcement steel sheet <NUM> may be connected to the end part of the flexible printed circuit board <NUM> in a bonding or press-fitting manner. In addition, the reinforcement steel sheet <NUM> has relatively strong mechanical performance, and may be provided with a fastening structure to bear a pulling force generated when the flexible printed circuit board <NUM> is fastened. Specifically, using an example in which the electrical connection line <NUM> is connected to the first frame, a first connection hole <NUM> is disposed in the reinforcement steel sheet <NUM> at the end part of the flexible printed circuit board <NUM>, a direction of the first connection hole <NUM> is perpendicular to a board surface direction of the flexible printed circuit board <NUM>, and a second connection hole <NUM> corresponding to the first connection hole <NUM> is disposed in the first frame <NUM>. When the first connection hole <NUM> of the reinforcement steel sheet <NUM> matches and corresponds to the second connection hole <NUM> of the first frame <NUM>, a fastener may pass through the first connection hole <NUM> and the second connection hole <NUM> in sequence, so that the end part of the flexible printed circuit board <NUM> is fastened to the first frame <NUM>.

Specifically, because a main body of the flexible printed circuit board <NUM> is made of a material such as a polyester film, structure strength is relatively poor, and it is difficult to dispose a structure such as a hole. Therefore, the reinforcement steel sheet <NUM> is disposed at the end part of the flexible printed circuit board <NUM>, and the first connection hole <NUM> is disposed in the reinforcement steel sheet <NUM>. When the first connection hole <NUM> matches and corresponds to the second connection hole <NUM>, the first connection hole <NUM> and the second connection hole <NUM> are disposed opposite to each other and concentrically, so that the first connection hole <NUM> and the second connection hole <NUM> can be fastened by using a same fastener. The fastener may be a common fastener, for example, a threaded fastener such as a screw, or another fastener commonly used by a person skilled in the art such as a stud or a rivet, which is not limited herein.

The reinforcement steel sheet <NUM> maintains a relatively small thickness and also has relatively strong mechanical strength. Therefore, the end part of the flexible printed circuit board <NUM> can be reliably fastened. A length direction of the reinforcement steel sheet <NUM> may be consistent with a width direction of the flexible printed circuit board <NUM>. In this way, in an entire width direction of the flexible printed circuit board <NUM>, the flexible printed circuit board <NUM> is tightly pressed and fastened by the reinforcement steel sheet <NUM>, thereby achieving a better positioning effect on the end part of the flexible printed circuit board <NUM>.

When the end part of the flexible printed circuit board <NUM> is fastened to the frame, in an optional manner, an elastic cushion <NUM> may be disposed on the frame, and the elastic cushion <NUM> is located between the frame and the reinforcement steel sheet <NUM>. In this case, because the elastic cushion <NUM> has a specific deformation capability, a specific gap is formed between the reinforcement steel sheet <NUM> and the corresponding frame, and an axial position of the reinforcement steel sheet <NUM> relative to the frame may change within a range of the gap, so that a position of a connection point between the end part of the flexible printed circuit board <NUM> and the frame may be slightly regulated. In this case, even if the position of the connection point between the end part of the flexible printed circuit board <NUM> and the frame has a small position error, for example, when a length of the flexible printed circuit board <NUM> is insufficient to reach the connection point between the flexible printed circuit board <NUM> and the frame, the error can be compensated by elastic deformation of the elastic cushion <NUM>, thereby avoiding a risk that the flexible printed circuit board <NUM> is tensed or even broken due to the insufficient length.

In addition, the elastic cushion <NUM> may be made of a flexible material such as foam. Therefore, the elastic cushion <NUM> can also protect a surface of the end part of the flexible printed circuit board <NUM> to prevent an outer surface of the flexible printed circuit board <NUM> from being damaged by an external force. Optionally, the cushion <NUM> may cover a region in which the end part of the flexible printed circuit board <NUM> is correspondingly connected to a connecting piece. To improve insulation performance of the flexible printed circuit board <NUM> from another component, the elastic cushion <NUM> may be made of insulation foam.

In addition, to assist in fastening the reinforcement steel sheet <NUM>, optionally, a positioning steel sheet may be further disposed on the frame, and a third connection hole is disposed in the positioning steel sheet. The positioning steel sheet may be disposed on the reinforcement steel sheet <NUM>, and the positioning steel sheet is located on a side that is of the reinforcement steel sheet <NUM> and that is away from the frame. In this case, the fastener may sequentially pass through the third connection hole, the first connection hole, and the second connection hole, so that the positioning steel sheet, the elastic cushion <NUM>, the reinforcement steel sheet <NUM>, and the frame are fastened together in an axial direction of the fastener.

In this case, the elastic cushion <NUM> may have a plurality of different positions. The elastic cushion <NUM> may be disposed between the reinforcement steel sheet <NUM> and the frame, and the elastic cushion <NUM> may alternatively be disposed between the positioning steel sheet and the reinforcement steel sheet <NUM>. Alternatively, the elastic cushion <NUM> may be disposed between the reinforcement steel sheet <NUM> and the frame, or between the positioning steel sheet and the reinforcement steel sheet <NUM>.

When the cable <NUM> is fastened on the frame, in an optional implementation, a cable groove <NUM> may be provided in the frame, and the cable <NUM> is buried in the cable groove <NUM>. A position and a direction of the cable <NUM> may be constrained by using the cable groove <NUM>.

To prevent the cable <NUM> from being detached from the interior of the cable groove <NUM>, the frame may use another positioning structure or positioning manner to assist in positioning the cable <NUM>. In an optional manner, the cable <NUM> may be bonded to the cable groove <NUM> by using a bonding agent. Specifically, after the cable <NUM> is installed inside the cable groove <NUM>, the cable <NUM> and the cable groove <NUM> may be bonded together in a glue dispensing manner.

In another optional manner, the reinforcement steel sheet <NUM> may also be configured to assist in positioning the cable <NUM>. Specifically, the reinforcement steel sheet <NUM> may cover a region in which the cable groove <NUM> is located, and is pressed on an outer side of the cable <NUM>. In this case, displacement of the cable <NUM> in each circumferential direction is constrained by the reinforcement steel sheet <NUM> or the cable groove, and therefore, the position of the cable <NUM> is limited. In this case, the same reinforcement steel sheet <NUM> is used to position the flexible printed circuit board <NUM> and the cable <NUM>. In this way, limited space inside the foldable screen device can be effectively used, so that the device is more compact.

In addition, another material having relatively good mechanical performance may also be used to replace the reinforcement steel sheet <NUM>. For example, a high-strength plastic material may be used to reinforce and position the end part of the flexible printed circuit board <NUM>.

Optionally, the surface of the cable <NUM> may be further wrapped with acetic acid cloth for protecting the cable <NUM>. The acetic acid cloth may be located between an outer surface of the cable <NUM> and a contact surface of another structure, and has a cushioning and insulation effect to some extent. In addition, the surface of the cable <NUM> may also be protected by using an injection molding structure or other manners well known by a person skilled in the art, which is not limited herein.

In addition, to fasten an end part of the flexible printed circuit board <NUM> or the cable <NUM>, the frame may further have a positioning structure and a positioning component in another form and structure. This is not limited herein.

After the electrical connection line <NUM> is positioned and fastened, the electrical connection line <NUM> still has a specific free deformation capability. Therefore, when the foldable screen device is opened and closed, the electrical connection line <NUM> may scratch another component or structure outside the electrical connection line <NUM>. To avoid scratching between the electrical connection line <NUM> and another structure, in an optional implementation, a flexible protective cover is further disposed at a joint position of the two frames. <FIG> is a schematic diagram of an inner-side connection of the flexible protective cover in the foldable screen device according to this embodiment of this application. <FIG> is a schematic diagram of an outer-side connection of the flexible protective cover in the foldable screen device according to this embodiment of this application. As shown in <FIG> and <FIG>, edges of two opposite sides of the flexible protective cover <NUM> are respectively connected to two frames, and a main body of the flexible protective cover <NUM> covers a side of the electrical connection line <NUM>. When the foldable screen device is opened and closed, the flexible protective cover <NUM> is blocked between the electrical connection line <NUM> and an outer structure, to prevent the outer structure from contacting the electrical connection line <NUM>.

When the foldable screen device is opened and closed, the flexible printed circuit board <NUM> and the cable <NUM> in the electrical connection line <NUM> mostly face the inner side of the foldable screen device, that is, opening and closing ends of the foldable screen device are bent. Therefore, accordingly, the flexible protective cover <NUM> is disposed on a side that is of the electrical connection line <NUM> and that is close to the opening and closing ends of the foldable screen device. To enable the flexible protective cover <NUM> to protect the electrical connection line <NUM> comprehensively, a size of the flexible protective cover <NUM> in a length direction of the rotating shaft <NUM> may be greater than or equal to a size of a region occupied by the electrical connection line <NUM> in this direction. In this case, parts of the electrical connection line <NUM> between the two frames are all covered and protected by the flexible protective cover <NUM>.

The flexible protective cover <NUM> is made of a soft material. Therefore, even if the electrical connection line <NUM> comes into contact with the flexible protective cover <NUM>, the flexible protective cover <NUM> does not damage a surface of the electrical connection line <NUM>.

In an optional manner, the flexible protective cover <NUM> may be a corrugated protective cover. In this case, the entire flexible protective cover <NUM> has an uneven corrugated surface, and the corrugated surface may be correspondingly unfolded or folded when the foldable screen device is opened or closed, to form protection regions of different sizes to adapt to different opening and closing angles of the foldable screen device.

Different components may be disposed in different frames of the foldable screen device, and these components have different power and heat. As heat accumulates, different frames may have a relatively large temperature difference. Consequently, display effects of parts that are of the flexible screen and that correspond to the different frames are affected, and a display uniformity problem such as a color cast in a local area of the screen is caused. Therefore, the flexible protective cover <NUM> connected between the different frames may have a specific heat transfer capability, to transfer heat between the different frames, reduce the temperature difference between the different frames, and improve display uniformity of the flexible screen.

Specifically, the flexible protective cover <NUM> may be made of a thermally conductive film. The thermally conductive film may be made of a material such as graphite or carbon fiber, and has a relatively good thermal conductivity. In this way, the flexible protective cover <NUM> connected between the different frames can transfer heat on a frame to another frame, so that temperatures of the two frames are relatively uniform. In addition, all parts that are of the flexible screen and that are correspondingly disposed on the different frames also have relatively good display uniformity.

In this case, in an optional manner, the flexible protective cover <NUM> may have a heat dissipation surface <NUM> that fits the frame (not shown in the figure). The heat dissipation surface <NUM> has a relatively large heat dissipation area. Therefore, the flexible protective cover <NUM> can implement a relatively fast heat conduction speed by using the heat dissipation surface <NUM> and the frame, so that there is relatively good temperature uniformity between the first frame <NUM> and the second frame <NUM>.

In this embodiment, a foldable screen device includes a first frame, a second frame, and a rotating shaft assembly connected between the first frame and the second frame. A connection structure in the rotating shaft assembly forms a channel through which an electrical connection line can pass and that can fasten the electrical connection line. In addition, in the connection structure, a magnetic piece is disposed to assist in positioning the connection structure and the electrical connection line. In this way, the electrical connection line is positioned by the rotating shaft assembly, so that bending deformation generated by the electrical connection line when the foldable screen device is folded is relatively small, and a bending amount is prone to control. Therefore, connection reliability is high.

In the foldable screen device, when an electrical connection line <NUM> is positioned by using a connection structure <NUM> in a rotating shaft assembly <NUM>, the electrical connection line <NUM> is fastened without the aid of a magnetic piece, but is limited only by using cooperation between a positioning piece <NUM> in the connection structure <NUM> and a first shaft cover <NUM>. <FIG> is a schematic diagram of a cross section of a connection structure in another foldable screen device according to an embodiment of this application. <FIG> is a schematic structural diagram of the connection structure in the another foldable screen device in a first direction according to this embodiment of this application. <FIG> is a schematic structural diagram of the connection structure in the another foldable screen device in a second direction according to this embodiment of this application. As shown in <FIG>, main structures, functions, and working principles of the foldable screen device in this embodiment are similar to those of the foldable screen device in the foregoing scenario <NUM>, and details are not described herein again. A difference between this scenario and the foregoing scenario <NUM> lies in that the connection structure <NUM> included in the rotating shaft assembly <NUM> of the foldable screen device in this scenario does not include a magnetic piece. In this case, the connection structure <NUM> mainly includes the first shaft cover <NUM>, a second shaft cover <NUM>, and the positioning piece <NUM>. The positioning piece <NUM> is located between the second shaft cover <NUM> and the first shaft cover <NUM>, and the electrical connection line <NUM> is located between the positioning piece <NUM> and the first shaft cover <NUM>.

Specifically, in this scenario, the first shaft cover <NUM>, the second shaft cover <NUM>, and the positioning piece <NUM> in the connection structure <NUM> have structures similar to those in the foregoing scenario, and the positioning piece <NUM> may be installed between the first shaft cover <NUM> and the second shaft cover <NUM> by using the specific structure in the foregoing scenario. For overall structures and relative positions of the first shaft cover <NUM>, the second shaft cover <NUM>, and the positioning piece <NUM>, refer to the descriptions in the foregoing scenario <NUM>. In this case, because the connection structure <NUM> does not include the magnetic piece, a second fixing surface <NUM> of the positioning piece <NUM> and a first fixing surface <NUM> of the first shaft cover <NUM> each may be a flat surface, and no installation slot needs to be provided.

Claim 1:
A foldable screen device (<NUM>), comprising two frames (<NUM>, <NUM>), an electrical connection line (<NUM>), and a rotating shaft assembly (<NUM>) articulated with the two frames, wherein the two frames (<NUM>, <NUM>) are capable of rotating around rotating shafts (<NUM>) of the rotating shaft assembly (<NUM>) to be closed or opened; and the rotating shaft assembly (<NUM>) comprises hinges (<NUM>) and a connection structure (<NUM>), the hinge (<NUM>) is connected between the connection structure (<NUM>) and the frame (<NUM>, <NUM>), the connection structure (<NUM>) has a channel passing through two opposite sides of the rotating shaft assembly (<NUM>), two ends of the electrical connection line (<NUM>) are respectively connected to the two frames (<NUM>, <NUM>), the electrical connection line (<NUM>) penetrates into the channel, and the channel and the hinge (<NUM>) are located at different positions of the rotating shaft assembly in an axial direction,
characterised in that
the connection structure (<NUM>) comprises a first shaft cover (<NUM>) and a second shaft cover (<NUM>), the first shaft cover and the second shaft cover are disposed opposite to each other, the first shaft cover (<NUM>) is located on an inner side that is of the rotating shaft assembly (<NUM>) and that is close to articulated ends of the frames (<NUM>, <NUM>), the second shaft cover (<NUM>) is located on a side that is of the rotating shaft assembly (<NUM>) and that is close to free ends of the frames (<NUM>, <NUM>), and the first shaft cover and the second shaft cover enclose a space capable of accommodating the rotating shafts (<NUM>),
the connection structure (<NUM>) further comprises a positioning piece (<NUM>), the positioning piece is located in the space jointly enclosed by the first shaft cover (<NUM>) and the second shaft cover (<NUM>), and the channel is jointly formed by the positioning piece (<NUM>) and one of the first shaft cover (<NUM>) and the second shaft cover (<NUM>), and
the foldable screen device (<NUM>) further comprises a first magnetic piece (<NUM>) and a second magnetic piece (<NUM>), wherein the first magnetic piece (<NUM>) is disposed on the first shaft cover (<NUM>), the second magnetic piece (<NUM>) is disposed on the positioning piece (<NUM>), and the first magnetic piece and the second magnetic piece are attractable to each other, so that the positioning piece (<NUM>) and the first shaft cover (<NUM>) are positioned to each other.