ELECTRONIC APPARATUS INCLUDING FLEXIBLE PRINTED CIRCUIT BOARD

An electronic device includes: a first housing; a second housing connected to the first housing and being partially moveable in a moving direction; a display supported by the first housing and the second housing and configured to change between a first state and a second state; and a flexible printed circuit board having a length in the moving direction which changes based one the movement of the first housing and the second housing, the flexible printed circuit board includes: a first wire including a first signal circuit formed along a first length direction; a second wire including a second signal circuit formed along a second length direction; a bonding sheet configured to bond the first wire and the second wire along a bonding area; and one or more signal vias penetrating the first wire and the second wire and electrically connecting the first signal circuit to the second signal circuit.

BACKGROUND ART

The disclosure relates to an electronic apparatus including a flexible printed circuit board.

2. Description of the Related Art

Recently, electronic devices, such as portable terminals, have been developed to improve their convenience of use through miniaturization while having various functions to satisfy consumers' purchasing desires. Various components and boards for performing functions are mounted inside an electronic device, and these components may be connected through a flexible printed circuit board (FPCB).

Electronic devices with a varying display area that is exposed to the outside depending on a use state have been developed. For example, a slidable electronic device may adjust a display area exposed to the outside by changing the shape to be expanded or reduced according to a relative movement of a housing. For such a shape-changing electronic device, since a relative position of a plurality of components placed inside changes depending on the movement of a housing, a flexible printed circuit board (FPCB) of which the shape is changeable may be used to electrically connect the components of which the relative position changes. Since the repeated shape changes of an FPCB may cause stress concentration in, for example, a folding portion, a life service of the FPCB may be increased by relieving local stress on the FPCB.

SUMMARY

Provided is an electronic device including an FPCB and stress concentration in the FPCB according to the operations of the electronic device may be alleviated by applying a segmental structure to the FPCB.

Provided is an electronic device including an FPCB where an arrangement space inside the electronic device may be optimized by decreasing an angular change according to a shape change of the FPCB.

According to an aspect of the disclosure, an electronic device includes: a first housing; a second housing connected to the first housing, the second housing being partially moveable in a moving direction; a display supported by the first housing and the second housing and configured to change between a first state and a second state, an area of the display being visually exposed to an outside according to a relative movement of the first housing and the second housing, the first state being a state in which the area of the display is visually exposed at a minimum, the second state being a state in which the area of the display is visually exposed at a maximum; and a flexible printed circuit board having a length in the moving direction which changes based one the movement of the first housing and the second housing, wherein the flexible printed circuit board includes: a first wire comprising a first signal circuit formed along a first length direction; a second wire comprising a second signal circuit formed along a second length direction; a bonding sheet configured to bond the first wire and the second wire along a bonding area; and one or more signal vias penetrating the first wire and the second wire and configured to electrically connect the first signal circuit to the second signal circuit.

The first wire may include a first board surface and a second board surface opposite to the first board surface, the second wire may include a third board surface and a fourth board surface opposite to the third board surface, and at the bonding area, the first board surface and the third board surface may face each other with the bonding sheet therebetween, the first board surface and the third board surface may each have a shape corresponding to a shape of the bonding sheet.

The flexible printed circuit board may further include a first cover overlapping the bonding sheet on at least a portion of the second board surface, and a second cover overlapping with the bonding sheet on at least a portion of the fourth board surface.

The flexible printed circuit board may further include one or more dummy vias penetrating the first cover and the second cover.

The one or more dummy vias may be adjacent to the first signal circuit and the second signal circuit in a width direction perpendicular to the first length direction.

Each of the first cover and the second cover may include a first cover portion overlapping with the bonding sheet, and a second cover portion extending from the first cover portion in the first length direction and the second length direction.

The electronic device may further include a plurality of dummy vias penetrating the first cover and the second cover, the plurality of dummy vias may include a plurality of first dummy vias on the first cover portion, and a plurality of second dummy vias on the second cover portion.

Each of the plurality of first dummy vias may be on both sides of the one or more signal vias along a width direction perpendicular to the first length direction.

Each of the first cover and the second cover may include a first cover portion overlapping with the bonding sheet and forming the bonding area, and a pair of third cover portions each extending to both sides of the first cover portion along a width direction perpendicular to the first length direction.

The electronic device may further include a plurality of dummy vias penetrating the first cover and the second cover, the plurality of dummy vias may include a plurality of first dummy vias on the first cover portion, and a plurality of third dummy vias on the pair of third cover portions.

Each of the first cover and the second cover may have a shape corresponding to a shape of the bonding sheet and overlap with the bonding sheet, and the flexible printed circuit board may further include a plurality of dummy vias penetrating the first cover and the second cover and enclosing a circumference of the one or more signal vias.

The flexible printed circuit board may further include a first connector connected to a first end of the first wire opposite to the bonding area based on the first length direction, and a second connector connected to a second end of the second wire opposite to the bonding area based on the second length direction.

The first wire is between the first connector and the bonding area and may include a first bending portion of which at least a portion may partially bend, and the second wire may be formed between the second connector and the bonding area and include a second bending portion of which at least a portion partially bends.

The flexible printed circuit board may further include a first rigid member on at least a portion of a surface of the first wire and may be configured to reinforce a rigidity of the first wire, and a second rigid member on at least a portion of a surface of the second wire and may be configured to reinforce a rigidity of the second wire.

The bonding sheet may be formed of a material having a rigidity greater than a material of each of the first wire and the second wire.

DETAILED DESCRIPTION

Hereinafter, one or more embodiments will be described in detail with reference to the accompanying drawings. When describing the one or more embodiments with reference to the accompanying drawings, like reference numerals refer to like elements and a repeated description related thereto will be omitted.

FIG.1is a block diagram illustrating an electronic device in a network environment according to one or more embodiments. Referring toFIG.1, the electronic device101in the network environment100may communicate with an electronic device102via a first network198(e.g., a short-range wireless communication network), or communicate with at least one of an electronic device104or a server108via a second network199(e.g., a long-range wireless communication network). According to an one or more embodiments, the electronic device101may communicate with the electronic device104via the server108. According to one or more embodiments, the electronic device101may include a processor120, a memory130, an input module150, a sound output module155, a display module160, an audio module170, and a sensor module176, an interface177, a connecting terminal178, a haptic module179, a camera module180, a power management module188, a battery189, a communication module190, a subscriber identification module (SIM)196, or an antenna module197. In one or more embodiments, at least one (e.g., the connecting terminal178) of the above components may be omitted from the electronic device101, or one or more other components may be added in the electronic device101. In one or more embodiments, some (e.g., the sensor module176, the camera module180, or the antenna module197) of the components may be integrated as a single component (e.g., the display module160).

The program140may be stored as software in the memory130and may include an operating system (OS)142, middleware144, or an application146.

The input module150may receive, from outside (e.g., a user) the electronic device101, a command or data to be used by another component (e.g., the processor120) of the electronic device101. The input module150may include a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

The display module160may visually provide information to the outside (e.g., a user) of the electronic device101. The display module160may include a control circuit for controlling a display, a hologram device, or a projector and control circuitry to control a corresponding one of the display, the hologram device, and the projector. According to one or more embodiments, the display device160may include a touch sensor adapted to sense a touch or a pressure sensor adapted to measure the intensity of a force incurred by the touch.

The haptic module179may convert an electric signal into a mechanical stimulus (e.g., a vibration or a movement) or an electrical stimulus, which may be recognized by a user via their tactile sensation or kinesthetic sensation. According to one or more embodiments, the haptic module179may include a motor, a piezoelectric element, or an electric stimulator.

The camera module180may capture a still image and moving images. According to one or more embodiments, the camera module180may include one or more lenses, image sensors, ISPs, or flashes.

The power management module188may manage power supplied to the electronic device101. According to one or more embodiments, the power management module188may be implemented as at least a part of a power management integrated circuit (PMIC).

The battery189may supply power to at least one component of the electronic device101. According to one or more embodiments, the battery189may include a primary cell that is not rechargeable, a secondary cell that is rechargeable, or a fuel cell.

The antenna module197may transmit or receive a signal or power to or from the outside (e.g., the external electronic device) of the electronic device101. According to one or more embodiments, the antenna module197may include an antenna including a radiating element including a conductive material or a conductive pattern formed in or on a substrate (e.g., a printed circuit board (PCB)). According to one or more embodiments, the antenna module197may include a plurality of antennas (e.g., array antennas). In such a case, at least one antenna appropriate for a communication scheme used in a communication network, such as the first network198or the second network199, may be selected by the communication module190from the plurality of antennas. The signal or power may be transmitted or received between the communication module190and the external electronic device via the at least one selected antenna. According to one or more embodiments, another component (e.g., a radio frequency integrated circuit (RFIC)) other than the radiating element may be additionally formed as a part of the antenna module197.

According to one or more embodiments, commands or data may be transmitted or received between the electronic device101and the external electronic device104via the server108coupled with the second network199. Each of the external electronic devices (e.g., the electronic device102or104) may be a device of the same type as or a different type from the electronic device101. According to one or more embodiments, all or some of operations to be executed by the electronic device101may be executed at one or more external electronic devices (e.g., the external devices102and104, and the server108). If the electronic device101needs to perform a function or a service automatically, or in response to a request from a user or another device, the electronic device101, instead of, or in addition to, executing the function or the service, may request the one or more external electronic devices to perform at least part of the function or service. The one or more external electronic devices receiving the request may perform the at least part of the function or service, or an additional function or an additional service related to the request and may transfer a result of the performance to the electronic device101. The electronic device101may provide the result, with or without further processing the result, as at least part of a response to the request. To that end, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used. The electronic device101may provide ultra-low-latency services using, e.g., distributed computing or MEC. According to one or more embodiments, the external electronic device104may include an Internet-of-things (IoT) device. The server108may be an intelligent server using machine learning and/or a neural network. According to one or more embodiments, the external electronic device104or the server108may be included in the second network199. The electronic device101may be applied to intelligent services (e.g., a smart home, a smart city, a smart car, or healthcare) based on 5G communication technology or IoT-related technology.

The electronic device according to one or more embodiments may be one of various types of electronic devices. The electronic device may include a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance device. According to one or more embodiments, the electronic device is not limited to those described above.

FIG.2Ais a front view of a first state of an electronic device according to one or more embodiments,FIG.2Bis a rear view of the first state of the electronic device according to one or more embodiments,FIG.2Cis a front view of a second state of the electronic device according to one or more embodiments,FIG.2Dis a front view of the second state of the electronic device according to one or more embodiments, andFIG.2Eis an exploded perspective view of the electronic device according to one or more embodiments.

Referring toFIGS.2A through2E, an electronic device201(e.g., the electronic device101ofFIG.1) according to one or more embodiments may include housings210and220that form an exterior and accommodate components inside. According to one or more embodiments, the housings210and220may include a first housing210and a second housing220that are partially connected to be movable to each other.

The first housing210and the second housing220may be relatively movably connected along a moving direction (e.g., an X-axis direction). According to one or more embodiments, the second housing220may be connected to move relative to the first housing210in a first direction (e.g., a −X-axis direction) or move relative to the first housing210in a second direction (e.g., a +X-axis direction) that is opposite to the first direction. In addition, the operations of the second housing220moving relative to the first housing210are provided for ease of description, the relative movement of the first housing210and the second housing220is not limited to the one or more embodiments. In addition, although the second housing220moving along the X-axis direction relative to the first housing210is illustrated in the drawing, the relative movement direction of the first housing210and the second housing220is not limited to the one or more embodiments illustrated in the drawing. The first housing210and the second housing220may be connected to be relatively movable along the Y-axis direction or may be connected to be movable along both X-axis and Y-axis directions. Hereinafter, for ease of description, the relative movement of the first housing210and the second housing220is described as the second housing220moves along the moving direction relative to the first housing210.

According to one or more embodiments, the first housing210may include a first surface210A (e.g., a first front surface), a second surface210B (e.g., a first rear surface) opposite to the first surface210A, a plurality (e.g., two) of first side surfaces210C (e.g., a first left side surface and a first right side surface) oriented in a direction (e.g., the +/−X direction) and positioned between the first surface210A and the second surface210B, and a plurality (e.g., two) of second side surfaces210D (e.g., a first upper side surface and a first lower side surface) oriented in another direction (e.g., the +/−Y direction) intersecting with the direction (e.g., the +/−X direction) and positioned between the first surface210A and the second surface210B. According to one or more embodiments, the plurality of first side surfaces210C may be formed of rounded surfaces. According to one or more embodiments, the first housing210may include at least one first hole H1formed on a second side surface210D (e.g., the first lower side surface) oriented in one direction (e.g., the −Y direction), of the second side surfaces210D.

The second housing220may include a third surface220A (e.g., a second front surface), a fourth surface220B (e.g., a second rear surface) opposite to the third surface220A, a plurality (e.g., two) of third side surfaces220C (e.g., a second left side surface and a second right side surface) oriented in a direction (e.g., the +/−X direction) and positioned between the third surface220A and the fourth surface220B, and a plurality (e.g., two) of fourth side surfaces220D (e.g., a second upper side surface and a second lower side surface) oriented in another direction (e.g., the +/−Y direction) intersecting with the direction (e.g., the +/−X direction) and positioned between the third surface220A and the fourth surface220B. Among the plurality of third side surfaces220C, a third side surface220C oriented in one direction (e.g., the +X direction) may include an open portion220E that is at least partially open. The plurality of third side surfaces220C may be formed of rounded surfaces. The second housing220may include at least one second hole H2formed on the fourth side surface220D (e.g., the second lower side surface) oriented in a direction (e.g., the −Y direction) among the plurality of fourth side surfaces220D. The second hole H2may be aligned with the first hole H1.

According to one or more embodiments, the electronic device201may include a display261(e.g., the display module160ofFIG.1) for displaying visual information. The display261may be supported by the first housing210and the second housing220and may include display areas261A,261B,261C, and261D that are visually exposed to the outside. According to one or more embodiments, the display261may be any of a flexible display, a foldable display, or a rollable display.

According to one or more embodiments, the display areas261A,261B,261C, and261D may include a first area261A on the first surface210A and the third surface220A, a second area261B on the third side surface220C oriented in a direction (e.g., the −X direction) among the third side surfaces220C, a third area261C on the third side surface220C oriented in another direction (e.g., the +X direction) among the third side surfaces220C and at least partially enclosing the open portion220E, and a fourth area261D on the second surface210B and the fourth surface220B.

According to one or more embodiments, the second area261B and the third area261C of the display261may have flexibly curved round surfaces. According to one or more embodiments, the second area261B may be partially on the first surface210A and the third surface220A. The third area261C may be partially on the first surface210A and the third surface220A. According to one or more embodiments, the third area261C may be partially on the second surface210B and the fourth surface220B.

According to one or more embodiments, the display261may be configured to partially display a screen. The display261may display the screen through the first area261A positioned on the first surface210A and the third surface220A, and the second area261B, the third area261C, and/or the fourth area261D may display the screen from points of view different from that of the first area261A. According to one or more embodiments, the display area of the display261may expand or may be reduced as the first housing210moves in the first direction and the second direction. Depending on the relative movement of the first housing210and the second housing220, the display261may change in an area of the display area between a reduced state (e.g., the first state ofFIG.2B) and an expanded state (the second state ofFIG.2D), in which the area of the display area is minimized in the reduced state and the area of the display area is maximized in the expanded state.

According to one or more embodiments, when viewed in one direction (e.g., the −Z direction), the electronic device201may change in states between the first state (e.g., the reduced state ofFIG.2B) having the display area (e.g., the first area261A, the second area261B, and the third area261C) of a first size and the second state (e.g., the expanded state ofFIG.2D) having the display area (e.g., the first area261A, the second area261B, and the third area261C) of a second size greater than the first size. In a state in which the first housing210moves relative to the second housing220in the first direction (e.g., the +X direction) in the first state, the display area of the display261viewed from the direction (e.g., the −Z direction) may expand as the size of the first area261A increases and the size of the fourth area261D decreases. On the other hand, in the second state, when the second housing220moves relative to the first housing210in the second direction (e.g., the −X direction) opposite to the first direction, the size of the first area261A may decrease and the size of the fourth area261D may increase. Meanwhile, while the electronic device201operates between the first state and the second state, the size of the second area261B and the size of the third area261C may be substantially constant.

According to one or more embodiments, the electronic device201may include a slide device290including a drive device291configured to move the first housing210and the second housing220relative to each other. The slide device290may be connected to the first housing210and the second housing220and may slide one of the first housing210and the second housing220relative to the other housing210or220. As the first housing210or the second housing220moves, the display may expand or may be reduced.

According to one or more embodiments, the electronic device201may include an input module250(e.g., the input module150ofFIG.1). The input module250may be formed on a third side surface220C (e.g., the second left side surface) where the open portion220E is not formed, of the plurality of third side surfaces220C.

According to one or more embodiments, the electronic device201may include a first sound output module255A (e.g., the sound output module155ofFIG.1) and a second sound output module255B (e.g., the sound output module155ofFIG.1). According to one or more embodiments, the first sound output module255A may be on a first portion (e.g., an upper portion) of the first housing210and the second sound output module255B may be on a second portion (e.g., a lower portion) different from the first portion of the first housing210.

According to one or more embodiments, in the first state (e.g., the reduced state of the electronic device201ofFIG.2A), the first sound output module255A may be configured to function as a transmitter/receiver and the second module255B may be configured to function as a speaker, whereas in the second state (e.g., the expanded state of the electronic device201ofFIG.2B), the first sound output module255A and the second sound output module255B may be configured to function as a speaker. According to one or more embodiments, in the second state, the first sound output module255A and the second sound output module255B may output stereo sound in cooperation with each other.

According to one or more embodiments, in the first state, the second sound output module255B may be configured to radiate sound through the first hole H1and the second hole H2substantially aligned with each other, and in the second state, the second sound output module255B may be configured to radiate sound through the first hole H1. In an embodiment, at least one of the first sound output module255A and the second sound output module255B may be in the second housing220. According to one or more embodiments, the electronic device201may include only one of the first sound output module255A and the second sound output module255B or may further include an additional sound output module in addition to the shown sound output modules.

According to one or more embodiments, the electronic device201may include a haptic module279(e.g., the haptic module179ofFIG.1). The haptic module279may include a vibrator configured to generate vibrations. According to one or more embodiments, the haptic module279may be in the second housing220. According to one or more embodiments, the haptic module279may be adjacent to the second sound output module255B. According to one or more embodiments, the haptic module279may be in the first housing210.

According to one or more embodiments, the electronic device201may include a first camera module280A (e.g., the camera module180ofFIG.1) and a second camera module280B (e.g., the camera module180ofFIG.1). The first camera module280A may be configured to obtain an image of one direction (e.g., the +Z direction) of the electronic device201, and the second camera module280B may be configured to obtain an image of the other direction (e.g., the −Z direction) of the electronic device201.

According to one or more embodiments, the first camera module280A and the second camera module280B may be in the second housing220. According to one or more embodiments, at least one of the first camera module280A and the second camera module280B may be in the first housing210. According to one or more embodiments, the electronic device201may include only one of the first camera module280A and the second camera module280B or may further include an additional camera module in addition to the shown camera modules.

According to one or more embodiments, the electronic device201may include a battery289(e.g., the battery189ofFIG.1). According to one or more embodiments, the battery289may be in the first housing210. The battery289may be at least partially enclosed by, according to one or more embodiments, the first sound output module255A, the first camera module280A, the second camera module280B, a first PCB251, the slide device300, a third PCB253, the haptic module279, and the second sound output module255B. According to one or more embodiments, the battery289may be in the second housing220.

According to one or more embodiments, the electronic device201may include the first PCB251, a second PCB252, and the third PCB253. The first PCB251, the second PCB252, and the third PCB253may include a plurality of metal layers and a plurality of dielectrics each positioned between a pair of adjacent metal layers. The first PCB251may be in the second housing220. The first PCB251may include a first electronic component288(e.g., the power management module188ofFIG.1). The second PCB252may be in the first housing210. According to one or more embodiments, the second PCB252may be electrically connected to the slide device300. The third PCB253may be in the second housing220. The third PCB253may be electrically connected, according to one or more embodiments, to the haptic module279.

According to one or more embodiments, the electronic device201may include a structure forming the housings210and220. According to one or more embodiments, the electronic device201may include a first cover211, a first plate212, a second plate213, and a support structure214, which form the first housing210, and may include a second cover221and a third plate222, which form the second housing220. The second plate213may connect the first plate212to the third plate222and may be connected slidably along the moving direction (e.g., the X-axis direction ofFIG.2C) relative to the first plate212or the third plate222depending on the relative movement of the second housing220to the first housing210.

According to one or more embodiments, the first cover211may partially enclose the first sound output module255A, the first camera module280A, the haptic module279, and the second sound output module255B. The first plate212may at least partially accommodate electronic components (e.g., the slide device300, the first sound output module255A, the second sound output module255B, the first camera module280A, the second camera module280B, the first PCB251, the second PCB252, the third PCB253, a connector assembly290, the haptic module279, and other electronic components). The second plate213may be positioned between the first plate212and the display261to support the slide device300and the display261.

The support structure214may include a base plate214B configured to flexibly bend and a plurality of support bars214B arranged along the base plate214A to be spaced apart from each other and configured to support the display261. The second cover221may be slidably connected to the first cover211to enclose the first cover211at least partially and slide the first cover211relative to the second cover221.

The second cover221may be configured to guide the plurality of support bars214B. The second cover221may expose at least a portion (e.g., the second camera module280B) of the electronic component to the outside of the electronic device201. The third plate222may enclose at least a portion of the second cover221. The third plate222may be formed of, according to one or more embodiments, a glass material. Meanwhile, the structures of the first housing210and the second housing220described herein are not limited to the one or more embodiments, and there may be various shapes of structures.

FIG.3Ais a diagram illustrating a state of a flexible printed circuit board in the first state of the electronic device according to one or more embodiments, andFIG.3Bis a diagram illustrating a state of the flexible printed circuit board in the second state of the electronic device according to one or more embodiments.

Referring toFIGS.3A and3B, an electronic device301according to one or more embodiments may include a first housing310, a second housing320, and a flexible printed circuit board390.

According to one or more embodiments, the first housing310and the second housing320may form an exterior of the electronic device301. According to one or more embodiments, the first housing310and the second housing320may be partially movably connected in a moving direction D1(e.g., an X-axis direction). According to one or more embodiments, in the process of changing the state of the electronic device301(e.g., the process of changing between the first state ofFIG.3Aand the second state ofFIG.3B), the second housing320may move relative to the first housing310in the moving direction D1.

According to one or more embodiments, a first plate313may be inside the first housing310and a second plate312may be inside the second housing320. The first plate313and the second plate312may change in a relative distance depending on a state change of the electronic device301, according to one or more embodiments, the relative movement of the first housing310and the second housing320. One or more components for performing functions of the electronic device301may be on the first plate313and the second plate312. According to one or more embodiments, a first component350A may be on the first plate313and a second component350B may be on the second plate312.

According to one or more embodiments, the flexible printed circuit board390may be inside the electronic device301. According to one or more embodiments, the flexible printed circuit board390may electrically connect a plurality of components inside the electronic device301. According to one or more embodiments, both ends of the flexible printed circuit board390may be connected respectively to the first component350A (e.g., the first sound output module255) inside the first housing310and the second component350B (e.g., the first camera module280A) inside the second housing320and may electrically connect the first component350A to the second component350B. According to one or more embodiments, the length of the flexible printed circuit board390may change in the moving direction D1depending on the relative movement of the first housing310and the second housing320. According to one or more embodiments, in a state in which the flexible printed circuit board390connects the first component350A to the second component350B, the flexible printed circuit board390may be partially bent or unfolded and may cause a change in the length in the moving direction D1correspondingly to a gap between the first component350A and the second component350B depending on the state of the electronic device301. According to one or more embodiments, based on the length in the moving direction D1, the flexible printed circuit board390may have a first length d1in the first state (e.g., a folded state ofFIG.3A) of the electronic device and may have a second length d2in the second state (e.g., an unfolded state ofFIG.3B) of the electronic device.

FIG.4Ais a perspective view of the flexible printed circuit board according one or more embodiments,FIG.4Bis an enlarged view of an A area ofFIG.4A,FIG.4Cis a partial perspective view of a bonding area of the flexible printed circuit board according to one or more embodiments, andFIG.4Dis a partial cross-sectional view of the flexible printed circuit board according to a IVc-IVc line ofFIG.4C.

Referring toFIGS.4A to4D, a flexible printed circuit board490according to one or more embodiments may include a segmental structure to reduce stress according to a bending operation. According to one or more embodiments, the flexible printed circuit board490may include a first wire491, a second wire492, a bonding sheet494, a signal via496, and a rigid member498.

According to one or more embodiments, the first wire491may include a first board surface4911and a second board surface4912opposite to the first board surface and may extend along a first length direction L1. The second wire492may include a third board surface4921and a fourth board surface4922opposite to the third board surface4921and may extend along a second length direction L2. According to one or more embodiments, the first wire491may include a first bonding portion4914formed at an end of the first length direction L1and may include a second bonding portion4924formed at an end of the second length direction L2. The first wire491and the second wire492may be connected through the first bonding portion4914and the second bonding portion4924and may form a bonding area B1. According to one or more embodiments, the first wire491and the second wire492may be connected such that the first board surface4911and the third board surface4921may face each other in the bonding area B1. According to one or more embodiments, the first wire491and the second wire492, which form the bonding area B1, may have the substantially same form, such as, an overlapping form in a facing state.

According to one or more embodiments, the first wire491and the second wire492may each include a signal circuit495for signal transmission. According to one or more embodiments, the first wire491may include a first signal circuit495aformed along the first length direction L1and the second wire492may include a second signal circuit495bformed along the second length direction L2. According to one or more embodiments, the signal circuit495may be formed with metal (e.g., copper) patterning on a surface of a layer forming the wires491and492. According to one or more embodiments, the wires491and492may include a base layer of a polyimide (PL) material, and the signal circuit495may be formed with the surface etched to form a pattern after a metal layer is formed in various known methods, such as sputtering, plating, or laminating on the base layer. In this case, a dielectric layer may be applied to the surface of the metal pattern forming the signal circuit495. According to one or more embodiments, the first signal circuit495aand the second signal circuit495bmay be electrically connected to each other through the bonding area B1. According to one or more embodiments, the first wire491may include a plurality of first signal circuits495aand the second wire492may include a plurality of second signal circuits495bof which the number corresponds to the number of the plurality of first signal circuits495a.

According to one or more embodiments, the first wire491and the second wire492may electrically connect components inside an electronic device (e.g., the electronic device101ofFIG.1, the electronic device201ofFIG.2C, or the electronic device301ofFIG.3A) through the first signal circuit495aand the second signal circuit495b.According to one or more embodiments, the first wire491may include a first connector4915connected to a part opposite to the first bonding portion4914based on the first length direction L1and configured to be connected to another component (e.g., the first or second component ofFIG.3A). The first wire491may include a second connector4925connected to a part opposite to the second bonding portion4924based on the second length direction L2and configured to be connected to the other component (e.g., the first or second component ofFIG.3A). In addition, although the flexible printed circuit board490including two wires connected through one bonding area B1is illustrated in the drawing, one or more embodiments are provided for ease of description, and the structure of the flexible printed circuit board490is not limited thereto. According to one or more embodiments, the flexible printed circuit board490may include three or more separate wires, and the separate wires may be sequentially connected through the bonding area B1formed at an end. Hereinafter, for ease of description, one or more embodiments of the flexible printed circuit board490including the first wire491and the second wire492is mainly described.

According to one or more embodiments, the first wire491and the second wire492may be formed of a flexible material and may change shapes depending on an operation (e.g., the state change operation of the electronic device between the first state ofFIG.3Aand the second state ofFIG.3B) of the electronic device. According to one or more embodiments, the first wire491and the second wire492may bend such that a gap between the first board surface4911and the third board surface4921changes, based on the bonding area B1, depending on the operation of the electronic device. According to one or more embodiments, the first wire491may include one or more first bending portions4913of which at least a portion partially bends and the second wire492may include one or more second bending portions4923of which at least a portion partially bends. In this case, the first bending portions4913may be formed between the first connector4915and the bonding area B1and the second bending portions4923may be formed between the second connector4925and the bonding area B1.

According to one or more embodiments, the bonding sheet494may bond a first bonding portion of the first wire491and a second bonding portion of the second wire492. According to one or more embodiments, the bonding sheet494may be in the bonding area B1and may bond the first wire491and the second wire492with both sides bonded to a first base surface and a second base surface. According to one or more embodiments, the bonding sheet494may be between the first base surface and a third base surface to which an adhesive is applied or may be formed with an adhesive applied between the first base surface and the third base surface forming the bonding area B1being hardened. According to one or more embodiments, in a state in which the second board surface4912is viewed, as illustrated inFIG.4B, the bonding sheet494may be formed to have the substantially same shape as the shape of the first wire491and the second wire492that form the bonding area B1.

According to one or more embodiments, the bonding sheet494may be formed of a material having relatively high stiffness compared to the first wire491and the second wire492. According to one or more embodiments, the bonding sheet494may be formed of polypropylene resin, epoxy resin, ceramic, glass, and/or metal. In this case, the bonding sheet494may improve the rigidity of a bonding portion of the flexible printed circuit board490such that a change in the shape of the bonding area B1may be limited in the process of changing the shape of the flexible printed circuit board490in response to the operation of the electronic device.

According to one or more embodiments, a signal via496may electrically connect the first signal circuit495aof the first wire491to the second signal circuit495bof the second wire492. According to one or more embodiments, the signal via496may be in the bonding area B1and may penetrate the first wire491and the second wire492and connect the first signal circuit495ato the second signal circuit495b.According to one or more embodiments, the first signal circuit495aand the second signal circuit495bmay include a via hole in the bonding area B1, and the signal via496, by being inserted into a via hole of each of the first signal circuit495aand the second signal circuit495b,may electrically connect the first signal circuit495ato the second signal circuit495b.According to one or more embodiments, there may be one or more signal vias496correspondingly to the number of signal circuits formed in a wire. According to one or more embodiments, as illustrated inFIG.4C, when the first wire491and the second wire492may respectively include three signal circuits, three signal vias496for connecting three signal circuits formed respectively in the first wire491and the second wire492to one another may be in the bonding area B1. However, the number of signal circuits and the number of signal vias496illustrated in the drawing are provided as one or more embodiments for ease of description, the number of signal circuits and the number of signal vias496are not limited thereto.

According to one or more embodiments, a first cover493aand a second cover493bmay be on the surface of the first wire491and the second wire492to reinforce the bonding area B1. According to one or more embodiments, the first cover493amay be placed to cover the second board surface4912of the first wire491forming the bonding area B1and the second cover493bmay be placed to cover the fourth board surface4922of the second wire492forming the bonding area B1. As illustrated inFIG.4B, based on a state in which the bonding area B1is viewed from the second board surface4912, the first cover493amay be placed on at least a portion of the second board surface4912to overlap with the bonding sheet494and the second cover493bmay be placed on at least a portion of the fourth board surface4922to overlap with the bonding sheet494. Hereinafter, for ease of description, the first cover493aand the second cover493bmay be collectively referred to as the covers493aand493b,and the description of the cover493may commonly apply to the first cover493aand the second cover493bunless otherwise stated.

According to one or more embodiments, the cover493may be formed of a flexible material. According to one or more embodiments, the cover493may include a first cover portion4931and a second cover portion4932. According to one or more embodiments, based on a state in which the second board surface4912is viewed, the first cover portion4931may overlap with the bonding sheet494and may form the bonding area B1, and the second cover portion4932may extend from the first cover portion4931in the not to overlap with the bonding sheet494. According to one or more embodiments, the second cover portion4932of the first cover493amay extend from the first cover portion in the first length direction L1and the second cover portion4932of the second cover493bmay extend from the first cover portion4931in the second length direction L2.

According to one or more embodiments, the second cover portion4932of the first cover493aand the second cover493bmay form a reinforcing area B2extending from the bonding area B1in the length directions L1and L2. According to one or more embodiments, the second cover portion4932of each of the covers493aand493bforming the reinforcing area B2may guide the second board surface4912and the fourth board surface4922may form a curved surface by partially bending while supporting the second board surface4912and the fourth board surface4922in the process of a distance changing between the first board surface4911and the third board surface4921according to the shape change of the flexible printed circuit board490. Accordingly, the second cover portion of the covers493aand493bmay reduce the phenomenon that excessive stress is concentrated in the first wire491and the second wire492positioned at the boundary of the bonding area B1and the reinforcing area B2.

According to one or more embodiments, the rigid member498may improve the rigidity of a certain portion of the first wire491and the second wire492. According to one or more embodiments, the rigid member498may include a first rigid member498aand a second rigid member498b,in which the first rigid member498amay be at least a portion of the surface of the first wire491and the second rigid member498bmay be at least a portion of the surface of the second wire492. According to one or more embodiments, the rigid member498may be formed of a rigid material. According to one or more embodiments, the rigid member498may be formed of polymer, ceramic, glass, and/or metal. The rigid member498, by supporting a part of a wire placed therein not to bend, may form a flat surface part of the wire that does not bend in the shape change process of the flexible printed circuit board490. In this case, a position and range of a bending part of the wire may be adjusted through a position of the rigid member498relative to the wire. On the other hand, althoughFIG.4Aillustrates that the first rigid member498ais on the first board surface4911of the first wire491and the second rigid member498bis on the third board surface4921of the second wire492, one or more embodiments are provided for ease of description, and the position of the rigid member498relative to the wires491and492and the number of rigid members498are not limited thereto. According to one or more embodiments, based on the first wire491, the rigid member498may be on each of the first board surface4911and the second board surface4912of the first wire491or may be between the first connector4915and the bending portion4913.

FIG.5Ais another partial perspective view of the bonding area of the flexible printed circuit board according to one or more embodiments,FIG.5Bis a partial plan view of the bonding area of the flexible printed circuit board according to one or more embodiments, andFIG.5Cis a partial cross-sectional view of the bonding area of the flexible printed circuit board according to one or more embodiments.

Referring toFIGS.5A to5C, a flexible printed circuit board590according to an embodiment may include a first wire591, a second wire592, a bonding sheet594, a signal via596, a first cover593a,a second cover593b,and a dummy via597.

According to one or more embodiments, the first wire591and the second wire592may be connected to each other through a bonding area B1. In a bonding area, the first wire591and the second wire592may be on the surface to face each other. The first wire591may have a first length direction L1and the second wire592may have a second length direction L2. According to one or more embodiments, the first wire591may include a first signal circuit595aformed along the first length direction L1and configured to transmit an electrical signal and the second wire592may include a second signal circuit595bformed along the second length direction L2and configured to transmit an electrical signal. According to one or more embodiments, the bonding sheet594may be in the bonding area B1, and both sides of the bonding sheet594may be bonded to the first wire591and the second wire592, respectively. According to one or more embodiments, as the bonding sheet594is formed of a more rigid material compared to the first wire591, the second wire592may limit a change of the shape of the bonding area B1in the shape change process of the flexible printed circuit board590. In this case, the first wire591and the second wire592may bend at least partially such that a gap between each other may be widened or narrowed, bordering the bonding area B1.

According to one or more embodiments, the signal via596may be in the bonding area and may connect the first wire591to the second wire592by penetrating the bonding sheet594. The signal via596may electrically connect the first wire591to the second wire592while both ends of the signal via596are connected to the first signal circuit595aand the second signal circuit595bas illustrated inFIG.5C.

According to one or more embodiments, a first cover593aand a second cover593bmay be on the surface of the first wire591and the second wire592to reinforce the bonding area. According to one or more embodiments, the first cover593amay be on the surface of the first wire591to face an opposite direction to the bonding sheet594and the second cover593bmay be on the surface of the second wire592to face an opposite direction to the bonding sheet594. According to one or more embodiments, the first cover593aand the second cover593bthat are formed of a flexible material may be transformed, conforming the bending of the wires591and592.

According to one or more embodiments, based on a state in which the surface of the first wire591is viewed, as illustrated inFIG.5B, the covers593aand593bmay overlap with the bonding sheet594and may include a first cover portion5931forming the bonding area B1and a second cover portion5932extending along the length direction of the wires from the first cover portion5931and forming a reinforcing area B2. According to one or more embodiments, the second cover portion5932may guide the bending of a part of the wires591and592positioned in the reinforcing area B2such that the surface of the wires may not be folded in the process of the bending of the wires591and592.

According to one or more embodiments, the dummy via597may improve the bonding strength of the bonding area B1of the flexible printed circuit board590. According to one or more embodiments, the dummy via597, by penetrating and connecting the first cover593aand the second cover593b,may assist a bonding state of the first wire591and the second wire592in the bonding area B1to be maintained solidly. According to one or more embodiments, the dummy via597may include a plurality of first dummy vias597placed in the bonding area. The plurality of first dummy vias597may penetrate the first cover portion5931of the second cover593band the first cover593aand may connect them in a direction perpendicular to the surfaces of the wires. In this case, the plurality of first dummy vias597may simultaneously penetrate and physically connect the bonding sheets594, covers593aand593b,the second wire592, and the first wire591forming the bonding area B1and may improve bonding strength.

According to one or more embodiments, the dummy via597may be placed not to overlap with the first signal circuit595aand the second signal circuit595bso as not to interfere with the transmission of an electrical signal through the flexible printed circuit board590. The dummy via597may be adjacent to the first signal circuit595aand the second signal circuit595bin in a width direction perpendicular to first length direction L1. According to one or more embodiments, as illustrated inFIG.5B, in a state in which the surface (e.g., the second board surface ofFIG.4A) of the first wire591is viewed, the signal via596may be placed at a center part in a width direction (e.g., a width in a V-axis direction) of the wires591and592perpendicular to the first length direction L1. According to one or more embodiments, the plurality of first dummy vias597may be placed on the first cover portion5931along both sides of the width direction of the wires.

According to one or more embodiments, the flexible printed circuit board590may stably maintain the bonding state of the bonding area B1through a physical connection of the first cover593aand the second cover593bthrough the dummy via597together with the bonding of the first wire591and the second wire592through the bonding sheet594.

FIG.6Ais another partial perspective view of the bonding area of the flexible printed circuit board according to one or more embodiments,FIG.6Bis another partial plan view of the bonding area of the flexible printed circuit board according to one or more embodiments, andFIG.6Cis another partial cross-sectional view of the bonding area of the flexible printed circuit board according to one or more embodiments.

Referring toFIGS.6A to6C, a flexible printed circuit board690according to one or more embodiments may include a first wire691, a second wire692, a bonding sheet694, a signal via696, a first cover693a,a second cover693b,and a plurality of dummy vias697.

According to one or more embodiments, the first wire691and the second wire692may be connected to each other through a bonding area B1. According to one or more embodiments, the first wire691may include a first signal circuit695aformed along a first length direction L1and the second wire692may include a second signal circuit695bformed along a second length direction L2. According to one or more embodiments, the bonding sheet694may be in the bonding area B1, and both sides of the bonding sheet694may be bonded to the first wire691and the second wire692, respectively. According to one or more embodiments, the bonding sheet694, by improving the rigidity of the bonding area B1, may decrease the bending of the bonding area B1in a shape change process of the flexible printed circuit board690. In this case, the first wire691and the second wire692may bend at least partially such that a gap between each other may be widened or narrowed, bordering the bonding area B1.

According to one or more embodiments, the signal via696may be in the bonding area B1and may connect the first wire691to the second wire692by penetrating the bonding sheet694. The signal via696may electrically connect the first wire691to the second wire692while both ends of the signal via696are connected to the first signal circuit695aand the second signal circuit695bas illustrated inFIG.5C.

According to one or more embodiments, the first cover693aand the second cover693bmay be on the surface of the first wire691and the second wire692to reinforce the bonding area B1. According to one or more embodiments, the first cover693amay be on the surface of the first wire691to face an opposite direction to the bonding sheet694and the second cover693bmay be on the surface of the second wire692to face an opposite direction to the bonding sheet694. According to one or more embodiments, the first cover693aand the second cover693bthat are formed of a flexible material may be transformed, conforming the bending of the wires691and692. According to one or more embodiments, as illustrated inFIG.6A, in a state in which a surface (e.g., the second board surface ofFIG.4A) of the first wire691is viewed, the cover693may include a first cover portion6931overlapping with the bonding sheet694and a second cover portion6932extending along the length directions L1and L2of the wires691and692from the first cover portion6931. According to one or more embodiments, the first cover portion6931of the cover693may form the bonding area B1and the second cover6932of the cover693may form a reinforcing area B2.

The second cover portion6932, by supporting the outer surfaces of the wires691and692in the reinforcing area B2, may prevent excessive stress from being concentrated in a surface part of the wires691and692at a boundary of the bonding area B1and the reinforcing area B2and may decrease the occurrence of folding.

According to one or more embodiments, the plurality of dummy vias697may penetrate and connect the first cover693aand the second cover693band may improve the bonding strength of the bonding area B1. According to one or more embodiments, the plurality of dummy vias697may be placed so as not to interfere with the transmission of an electrical signal through the flexible printed circuit board690. According to one or more embodiments, as illustrated inFIG.6B, in a state in which the surface (e.g., the second board surface ofFIG.4A) of the first wire691is viewed, the plurality of dummy vias697may be arranged to enclose the circumference of the signal via696. According to one or more embodiments, the plurality of dummy vias697may be at both ends of a width direction (e.g., a width in a U-axis direction) of the wires along the first length direction. In this case, the plurality of dummy vias697may be arranged along the width direction at an end of the bonding area B1where a signal circuit does not extend.

According to one or more embodiments, the dummy via697may include a first dummy via697aplaced on the first cover portion6931and a second dummy via697bplaced on the second cover portion6932. According to one or more embodiments, the first dummy via697a,by physically penetrating and connecting the first cover693a,the first wire691, the bonding sheet694, the second wire692, and the second cover693b,may improve the bonding strength of the bonding area B1. According to one or more embodiments, the second dummy via697b,by penetrating and connecting the second cover portion6932of the first cover693aand the second cover portion6932of the second cover693b,may constantly maintain a gap between the first wire691and the second wire692, which form the reinforcing area B2. Accordingly, in the shape change process of the flexible printed circuit board690, the second dummy via697may limit the bending of a part, which overlaps with the second cover portion6932, of the first wire691and the second wire692and may reduce the concentration of stress in a part of the wires691and692forming the boundary of the bonding area B1and the reinforcing area B2.

FIG.7is another partial perspective view of the bonding area of the flexible printed circuit board according to one or more embodiments.

Referring toFIG.7, a flexible printed circuit board790according to one or more embodiments may include a first wire791, a second wire792, a bonding sheet794, a signal via796, a first cover793a,a second cover793b,and a plurality of dummy vias797.

According to one or more embodiments, the first wire791and the second wire792may be connected to each other through a bonding area B1. According to one or more embodiments, the first wire791and the second wire792may each include a signal circuit795formed along length directions L1and L2. According to one or more embodiments, the bonding sheet794may be in the bonding area B1, and both sides of the bonding sheet794may be bonded to the first wire791and the second wire792, respectively. According to one or more embodiments, the bonding sheet794, by improving the rigidity of the bonding area B1, may decrease the bending of the bonding area B1in a shape change process of the flexible printed circuit board790. In this case, the first wire791and the second wire792may bend at least partially such that a gap between each other may be widened or narrowed, bordering the bonding area B1.

According to one or more embodiments, the signal via796may be in the bonding area B1and may connect the first wire791to the second wire792by penetrating the bonding sheet794. The signal via796may electrically connect the first wire791to the second wire792while both ends of the signal via796are connected to the first signal circuit795aand the second signal circuit795bas illustrated inFIG.5C.

According to one or more embodiments, the first cover793aand the second cover793bmay be on the surface of the first wire791and the second wire792to reinforce the bonding area B1. According to one or more embodiments, the first cover793amay be on the surface of the first wire791to face an opposite direction to the bonding sheet794and the second cover793bmay be on the surface of the second wire792to face an opposite direction to the bonding sheet794. According to one or more embodiments, the first cover793aand the second cover793bthat are formed of a flexible material may be transformed, conforming the bending of the wires791and792.

According to one or more embodiments, as illustrated inFIG.7, in a state in which a surface (e.g., the second board surface ofFIG.4A) of the first wire791is viewed, a cover793may have the substantially same shape as that of the bonding sheet794and may be placed to overlap with the bonding sheet794.

According to one or more embodiments, the plurality of dummy vias797may penetrate and connect the first cover793aand the second cover793b.In this case, the plurality of dummy vias797, by penetrating and connecting the first cover793a,the first wire791, the bonding sheet794, the second wire792, and the second cover793bin a direction perpendicular to a second board surface, may improve the bonding strength of the bonding area B1. According to one or more embodiments, the plurality of dummy vias797may be placed not to overlap with a signal circuit so as not to interfere with the signal transmission of the flexible printed circuit board790. According to one or more embodiments, in a state in which a surface (e.g., the second board surface ofFIG.4A) of the first cover793ais viewed, the plurality of dummy vias797aand797bmay be arranged along a length direction at both ends of a width direction of the bonding area B1to enclose the circumference of the signal via796. According to one or more embodiments, the dummy vias797may include one or more auxiliary dummy vias797carranged along a width direction at a part of the cover793forming the boundary of the bonding area B1. The auxiliary dummy vias797cmay perform a function of reinforcing a bonding state of the boundary of the bonding area B1such that the bonding state at the boundary of the bonding area B1may not be released according to a gap change between the first wire791and the second wire792.

FIG.8Ais another partial perspective view of the bonding area of the flexible printed circuit board according to one or more embodiments andFIG.8Bis another partial plan view of the bonding area of the flexible printed circuit board according to one or more embodiments.

Referring toFIGS.8A and8B, a flexible printed circuit board890according to an embodiment may include a first wire891, a second wire892, a bonding sheet894, a signal via896, a first cover893a,a second cover893b,and a plurality of dummy vias897.

According to one or more embodiments, the first wire891and the second wire892may be connected to each other through a bonding area B1. According to one or more embodiments, the first wire891may include a first signal circuit895aformed along a first length direction L1and the second wire892may include a second signal circuit895bformed along a second length direction L2. According to one or more embodiments, the bonding sheet894may be in the bonding area B1, and both sides of the bonding sheet894may be bonded to the first wire891and the second wire892, respectively. According to one or more embodiments, the bonding sheet894, by improving the rigidity of the bonding area B1, may decrease the bending of the bonding area B1in a shape change process of the flexible printed circuit board890. In this case, the first wire891and the second wire892may bend at least partially such that a gap between each other may be widened or narrowed, bordering the bonding area B1.

According to one or more embodiments, the signal via896may be in the bonding area B1and may connect the first wire891to the second wire892by penetrating the bonding sheet894. The signal via896may electrically connect the first wire891to the second wire892while both ends of the signal via896are connected to the first signal circuit895aand the second signal circuit895bas illustrated inFIG.5C.

According to one or more embodiments, the first cover893aand the second cover893bmay be on the surface of the first wire891and the second wire892to reinforce the bonding area B1. According to one or more embodiments, the first cover893amay be on the surface of the first wire891to face an opposite direction to the bonding sheet894and the second cover893bmay be on the surface of the second wire892to face an opposite direction to the bonding sheet894. According to one or more embodiments, the first cover893aand the second cover893bthat are formed of a flexible material may be transformed, conforming the bending of the wires891and892.

According to one or more embodiments, based on a state in which the surface (e.g., the second board surface ofFIG.4A) of the wires891and892is viewed, the cover893may include a first cover portion8931overlapping with the bonding sheet894and forming the bonding area B1and a third cover portion8933forming a second reinforcing area C by extending to both sides of the first cover portion8931along a width direction (e.g., a width in a U-axis direction) perpendicular to the first length direction L1. The third cover portion8933may include a 3-1th cover portion8933aextending to a left side (e.g., a −U-axis direction) of the first cover portion8931and forming a 2-1th reinforcing area C1and a 3-2th cover portion8933bextending to a right side (e.g., a +U-axis direction) of the first cover portion8931and forming a 2-2th reinforcing area C2. On the other hand, although a pair of third cover portions8933aand8933bconnected to the first cover portion is illustrated in the drawing, is the one or more embodiments are provided for ease of description. The cover893may include one third cover portion8933aor8933bof the 3-1th cover portion8933aand the 3-2th cover portion8933b,and an area of the pair of third cover portions8933aand8933bmay be the same as or different from each other.

According to one or more embodiments, the plurality of dummy vias897may penetrate and connect the first cover893aand the second cover893b.According to one or more embodiments, the plurality of dummy via897may include a plurality of first dummy vias897aand897bplaced on the first cover portion8971and a plurality of third dummy vias897cand897dplaced on the third cover portion8973. According to one or more embodiments, the plurality of first dummy vias897aand897b,by penetrating and connecting the first cover893a,the first wire891, the bonding sheet894, the second wire892, and the second cover893bin a direction perpendicular to a surface of the wires891and892, may improve the bonding strength of the bonding area B1. According to one or more embodiments, the plurality of first dummy vias897aand897bmay be arranged along a length direction at both ends of a width direction of the bonding area B1not to overlap with a signal circuit895. According to one or more embodiments, the plurality of first dummy vias897aand897bmay include a 1-1th dummy via897aon a left side (e.g., the −U-axis direction) of the width direction of the bonding area B1and a 1-2th dummy via897bon a right side (e.g., the +U-axis direction) of the width direction.

According to one or more embodiments, the plurality of third dummy vias897cand897dby being arranged on the third cover portion8933along the first length direction L1and penetrating and connecting the first cover893aand the second cover893bthat form the third cover portion8933, may constantly maintain a gap between the first cover893aand the second cover893b.According to one or more embodiments, the plurality of third dummy vias897cand897dmay include a 3-1th dummy via897cplaced on the 3-1th cover portion8933aand a 3-2th dummy via897dplaced on the 3-2th cover portion8933b.

The plurality of third dummy vias897cand897d,by maintaining a gap between the first cover893aand the second cover893bthat form the second reinforcing areas C1and C2, may reinforce the bonding strength of the bonding area B1.

According to one or more embodiments, the electronic device301includes the first housing310, the second housing320partially movably connected to the first housing310in the moving direction D1, the display261supported by the first housing310and the second housing320and configured to change between a first state and a second state, in which an area of a display area visually exposed to the outside according to a relative movement of the first housing and the second housing is at the minimum in the first state and the area of the display area is at the maximum in the second state, and a flexible printed circuit board of which a length in the moving direction changes according to the relative movement of the first housing and the second housing, in which the flexible printed circuit board490includes the first wire491including the first signal circuit495aformed along the first length direction L1, the second wire492including the second signal circuit495bformed along the second length direction L2, the bonding sheet494configured to bond the first wire491and the second wire492along the bonding area B1, and one or more signal vias496penetrating the first wire491and the second wire492and configured to electrically connect the first signal circuit495ato the second signal circuit495b.

According to one or more embodiments, the first wire491may include the first board surface4911and the second board surface4912opposite to the first board surface4911, and the second wire492may include the third board surface4921and the fourth board surface4922opposite to the third board surface4921, in which, in the bonding area B1, the first board surface4911and the third board surface4921may face each other with the bonding sheet494therebetween, and the first wire491and the second wire492may be formed to have the substantially same shape as that of the bonding sheet494.

According to one or more embodiments, the flexible printed circuit board490, based on a state in which the second board surface4912is viewed, may further include the first cover493aplaced on at least a portion of the second board surface4912to overlap with the bonding sheet494, and, based on a state in which the fourth board surface4922is viewed, may further include the second cover493bplaced on at least a portion of the fourth board surface4922to overlap with the bonding sheet494.

According to one or more embodiments, the flexible printed circuit board490may further include one or more dummy vias597connected to penetrate the first cover493aand the second cover493b.

According to one or more embodiments, in a state in which the second board surface4912is viewed, the one or more dummy vias597may be arranged not to overlap with the first signal circuit495aand the second signal circuit495b.

According to one or more embodiments, in a state in which the second board surface4912is viewed, each of the first cover593aand the second cover593bmay include the first cover portion5951and the second cover portion5932, in which the first cover portion5951overlaps with the bonding sheet594and forms the bonding area B1and the second cover portion5932extends from the first cover portion5931in the first length direction L1and the second length direction L2not to overlap with the bonding sheet494.

According to one or more embodiments, the flexible printed circuit board690may further include the plurality of dummy vias697connected to penetrate the first cover593aand the second cover693b,and the dummy vias697may include the plurality of first dummy vias697aplaced on the first cover portion6931and the plurality of second dummy vias697bplaced on the second cover portion6932.

According to one or more embodiments, in a state in which the second board surface4912is viewed, the plurality of first dummy vias597amay be respectively arranged on both sides of the one or more signal vias596along a width direction perpendicular to the first length direction L1.

According to one or more embodiments, in a state in which the second board surface4912is viewed, each of the first cover893aand the second cover893bmay include the first cover portion8931and the third cover portions8933aand8933b,in which the first cover portion8931overlaps with the bonding sheet894and forms the bonding area B1and the third cover portions8933aand8933bextends respectively to both sides of the first cover portion8931along the width direction of the first length direction L1.

According to one or more embodiments, the flexible printed circuit board890may further include the plurality of dummy vias897connected to penetrate the first cover893aand the second cover893b,and the dummy vias597, in a state in which the second board surface4912is viewed, may include the plurality of first dummy vias897aplaced on the first cover portion8931and the plurality of third dummy vias897cplaced on the third cover portions8933aand8933b.

According to one or more embodiments, in a state in which the second board surface4912is viewed, each of the first cover793aand the second cover793bmay have the substantially same shape as that of the bonding sheet794and may be placed to overlap with the bonding sheet794, and the flexible printed circuit board790may penetrate and connect the first cover793aand the second cover793band, in a state in which the second board surface4912is viewed, may further include the plurality of dummy vias797arranged to enclose the circumference of the one or more signal vias796.

According to one or more embodiments, the flexible printed circuit board790may further include the first connector4915connected to a first end of the first wire491opposite to the bonding area B1based on the first length direction L1and may further include the second connector4925connected to a second end of the second wire492opposite to the bonding area B1based on the second length direction L2.

According to one or more embodiments, the first wire491may be formed between the first connector4915and the bonding area B1and may include the first bending portion4913of which at least a portion partially bends, and the second wire492may be formed between the second connector4925and the bonding area B1and may include the second bending portion4923of which at least a portion partially bends.

According to one or more embodiments, the flexible printed circuit board790may further include the first rigid member498aplaced on at least a portion of a surface of the first wire491and configured to reinforce the rigidity of the first wire491and the second rigid member498bplaced on at least a portion of a surface of the second wire492and configured to reinforce the rigidity of the second wire492.

According to one or more embodiments, the bonding sheet494may be formed of a more rigid material than that of the first wire491and the second wire492.

According to one or more embodiments, the flexible printed circuit board490includes the first wire491including the first board surface4911and the second board surface4912that is opposite to the first board surface4911, in which the first signal circuit495ais formed along a length direction, the second wire492including the third board surface4921and the fourth board surface4922that is opposite to the third board surface4921and connected to the first wire491through the bonding area B1, the bonding sheet494placed in the bonding area B1and with each of both surfaces bonded to the first board surface4911and the third board surface4921, the signal via496penetrating the first wire491and the second wire492and configured to electrically connect the first signal circuit495ato the second signal circuit495b,in a state in which the second board surface4912is viewed, the first cover493aplaced on the second board surface4912of the first wire491to cover the bonding area B1, and, in a state in which the fourth board surface4922is viewed, the second cover493bplaced on the fourth board surface4922of the second wire492to cover the bonding area B1.

According to one or more embodiments, the flexible printed circuit board490may further include one or more dummy vias597configured to penetrate and connect the first cover493aand the second cover493b,and, in a state in which the second board surface4912is viewed, the dummy vias597may be placed not to overlap with the first signal circuit495aand the second signal circuit495b.

According to one or more embodiments, each of the first cover493aand the second cover493b,in a state in which the second board surface4912is viewed, may include the first cover portion4931overlapping with the bonding sheet494and forming the bonding area B1and the second cover portion4932extending from the first cover portion4931in the length direction.

According to one or more embodiments, the first cover493aand the second cover493bmay be formed of a flexible material, and, in a process of a change in a distance between the first board surface4911and the third board surface4921in the second cover portion, may guide the first board surface4911and the third board surface4921to form a curved surface.

According to one or more embodiments, in a state in which the second board surface4912is viewed, each of the first cover893aand the second cover893bmay include the first cover portion8931overlapping with the bonding sheet894and forming the bonding area B1and the third cover portions8933aand8933bextending from the first cover portion8931in a width direction perpendicular to the length direction, in which the plurality of dummy vias897configured to penetrate and connect the first cover portion493aand the second cover portion493bmay be arranged in the first cover portion and the third cover portion.

According to one or more embodiments, the electronic device301includes the first housing310, the second housing320partially movably connected to the first housing310in the moving direction D1, the display261supported by the first housing310and the second housing320and configured to change between a first state and a second state, in which an area of a display area visually exposed to an outside according to a relative movement of the first housing and the second housing is at the minimum in the first state and the area of the display area is at the maximum in the second state, and the flexible printed circuit board490of which both ends are placed respectively in the first housing310and the second housing320, in which the flexible printed circuit board490further includes the first wire491including the first length direction L1and the first signal circuit495aformed along the first length direction L1, the second wire492including the second length direction L2and the second signal circuit495bformed along the second length direction L2and connected to the first wire491through the bonding area B1, the bonding sheet494placed in the bonding area B1and with each of both surfaces bonded to the first wire491and the second wire492, the first cover493a,of which at least a portion is placed in the bonding area B1, placed on a surface of the first wire491to be opposed to the bonding sheet494, the second cover493b,of which at least a portion is placed in the bonding area B1, placed on a surface of the second wire492to be opposed to the bonding sheet494, one or more signal vias496penetrating the first wire491and the second wire492and configured to connect the first signal circuit495ato the second signal circuit495b,and the plurality of dummy vias597connected to penetrate the first cover493aand the second cover493b.

In addition, while example embodiments of the disclosure have been shown and described, the disclosure is not limited to the aforementioned specific embodiments, and it is apparent that various modifications may be made by those having ordinary skill in the technical field to which the disclosure belongs, without departing from the gist of the disclosure as claimed by the appended claims. Further, it is intended that such modifications are not to be interpreted independently from the technical idea or prospect of the disclosure.