Foldable electronic device that includes a hinge assembly

Abstract

An electronic device is provided comprising a first and a second housing, a hinged housing, a hinge structure configured to rotatably couple the first and second housings, a flexible printed circuit board, a flexible display, a first hinge, and a second hinge plate. The hinge structure comprises a support portion located between the circuit board and the display. In the unfolded state, the support portion, the first hinge plate, and the second hinge plate support a region of the flexible display, such that the first hinge plate rests on a first area of ​​the support portion and the second hinge plate rests on a second area of ​​the support portion opposite the first. In the folded state, the support portion is separated from the first and second hinge plates.

Description

Foldable electronic device that includes a hinge assembly Technical field The description generally refers to a foldable electronic device that includes a hinge assembly. Background of the technique Electronic devices have been developed in a portable or handheld format to improve mobility and accessibility. Electronic devices have evolved to be lighter and thinner, making them easier to carry and use. For example, a foldable electronic device with a flexible display offers a relatively larger screen than a typical bar-type electronic device, but decreases in size when folded, thus improving its portability. A foldable electronic device may include a flexible display device and a plurality of housings. The plurality of housings and the flexible display device may be coupled by a hinge assembly, allowing the housings to rotate within a designated range according to a user's manipulation. Through a rotation process of the plurality of housings, the electronic device may transition from a folded state to an unfolded state or vice versa. Document EP 3407581 A1 describes a mobile terminal that includes: a body comprising a first and a second body and being in a first state in which the first and second bodies are positioned in the same plane and a second state in which one of the first and second bodies is folded with respect to the other;and a display assembly disposed to one side of the first and second bodies, at least part of the display assembly being superimposed on the first and second bodies, wherein the display assembly includes a flat area that remains flat in the second state, and a folded area, folded in the second state, wherein the display assembly comprises a display panel, a first layer provided on the front side of the display panel, and a second layer provided on the rear side of the display panel, wherein at least part of the second layer provided on the rear side of the display panel is connected to a frame fixed to the body. According to document US 2018 / 0324964, an electronic device may comprise a first housing including a first surface and a second surface oriented in a direction opposite to the first surface, a second housing including a third surface and a fourth surface oriented in a direction opposite to the third surface, a hinge disposed between the first housing and the second housing configured to provide rotational movement between the first housing and the second housing, and a flexible display device disposed from the first surface of the first housing through the hinge to the third surface of the second housing, at least a portion of the flexible display device being configured to form a curved surface as the hinge structure folds.wherein the hinge may include double-axis hinges configured to provide a first rotational axis allowing the first housing to rotate around the second housing and a second rotational axis allowing the second housing to rotate around the first housing and a slide coupled with the first and second housings and configured to provide a sliding motion perpendicular to a longitudinal direction of the first and second housings. Document EP 3489795 A1 describes an electronic device. The electronic device includes two housing structures, a hinge structure, and a flexible display device. The hinge structure includes a first saw-tooth spur gear, a second saw-tooth spur gear, a third saw-tooth spur gear, a fourth saw-tooth spur gear, a first guide structure fixed to the first housing structure and rotated by the gears, and a second guide structure fixed to the second housing structure and rotated in the opposite direction to the first guide structure. The first guide structure is rotated around a first axis formed from a lower surface of the flexible display device upwards.and the second guide structure is rotated around a second axis that is separate from the first axis and is formed from the lower surface of the flexible display device. Description of the invention Technical Problem However, some areas of the flexible display device may not be supported by the hinge assembly. Therefore, some areas of the flexible display device may sag or be damaged due to sagging. Solution to the Problem The present invention relates to the object defined in the claims. The description is provided to address at least the problem and / or disadvantages described above and to provide at least the advantages described below. According to one aspect of the description, an electronic device is provided comprising a first housing that includes at least one first electronic component; a second housing that includes at least one second electronic component; a hinge housing disposed between the first and second housings; a hinge assembly assembled to the hinge housing to rotatably couple the first and second housings; first and second hinge plates covering at least part of the hinge assembly and coupled respectively to the first and second housings; a flexible printed circuit board (FPCB) that electrically couples the first and second electronic components via the hinge housing; and a flexible display device disposed from a region of the first housing to at least a region of the second housing via the hinge assembly.The hinge assembly includes a first support attached to at least a region of the first housing for rotation about a first virtual axis of rotation; a second support attached to at least a region of the second housing for rotation about a second virtual axis of rotation; a mounting bracket supporting the first and second supports; and a support portion including several support slots, the support portion being located between the FPCB and the flexible display device. At least a portion of the first and second hinge plates is supported by the support slots in an deployed state of the electronic device. Advantageous Effects of the Invention One aspect of the description is to provide a support structure capable of safely supporting a flexible display device to prevent the flexible display device from sagging or being damaged due to sagging. Another aspect of the description is to provide a support structure capable of safely supporting a flexible display device when an electronic device is in a deployed state, without affecting a drive path of the flexible display device. Another aspect of the description is to provide a support structure capable of preventing a flexible display device from being damaged and improving the flatness of the flexible display device. Brief description of the drawings The above and other aspects, characteristics, and advantages of certain embodiments of the description will become more evident from the following description taken in conjunction with the accompanying drawings, in which: Figure 1 illustrates an electronic device in a network environment according to one embodiment; Figures 2A to 2C illustrate a foldable electronic device in a folded state according to one embodiment; Figures 3A to 3C illustrate a foldable electronic device in a 180-degree unfolded state according to one embodiment; Figure 4A illustrates an orderly exploded view of an electronic device in an deployed state according to one embodiment; Figure 4B illustrates an exploded perspective view of an internal structure of an electronic device according to one embodiment; Figures 5A to 5C illustrate an opening / closing procedure for an electronic device according to one embodiment; Figure 6 illustrates an exploded perspective view of a hinge structure according to one embodiment; Figure 7A illustrates a perspective view of a support portion according to one embodiment; Figure 7B illustrates a plan view of a support portion according to one embodiment; Figure 7C illustrates a side view of a support portion according to one embodiment; Figure 8A illustrates a hinge assembly attached to an electronic device deployed according to one embodiment; Figure 8B illustrates a plan view of a hinge structure according to one embodiment; Figure 9 illustrates a perspective view of a hinge structure and a hinge housing that are separated according to one embodiment; Figure 10A illustrates a hinge structure when an electronic device is in an unfolded state according to one embodiment; Figure 10B illustrates a hinge structure when an electronic device rotates from an unfolded state to a folded state according to one embodiment; Figure 10C illustrates a hinge structure when an electronic device is in a folded state according to one embodiment; Figure 10D illustrates the operations of a support portion when an electronic device rotates from an open state to a closed state according to one embodiment; Figure 11 illustrates a fixing portion and a retaining structure of a hinge structure according to one embodiment; Figures 12A and 12B illustrate a coupling relationship between an arm structure and a retaining structure of a hinge structure according to one embodiment; Figure 13 illustrates an enlarged view of a hinge structure according to one embodiment; Figure 14A illustrates a compressed state of an elastic element and first and second arms of a hinge structure when an electronic device is in an extended state according to one embodiment; Figure 14B illustrates an elongated state of an elastic element and first and second arms of a hinge structure when an electronic device is in a folded state according to one embodiment; Figure 15A illustrates a cross-section of a hinge structure when an electronic device is in a 180-degree extended state according to one embodiment; Figure 15B illustrates a perspective view of a cross-section of a hinge assembly when an electronic device is in an deployed state according to one embodiment; Figure 15C illustrates a cross-section of a hinge structure when an electronic device is in a folded state according to one embodiment; Figure 15D illustrates a cross-section of a hinge structure while folding an electronic device according to one embodiment; Figure 16 illustrates a hinge assembly attached to an electronic device deployed according to one embodiment; Figure 17A illustrates a support portion in an assembled state according to one embodiment; Figure 17B illustrates a perspective view of the support portion of Figure 17A, cut along line CC; Figure 17C illustrates a cross-sectional view of the support portion of Figure 17A, cut along line CC; Figure 18 illustrates a cross-sectional view of the support portion of Figure 17A, cut along line DD; Figures 19A to 19C illustrate an opening / closing process of an electronic device according to one embodiment; Figure 20A illustrates an assembly state of a first and second hinge plate on an electronic device unfolded 180 degrees according to one embodiment; Figure 20B illustrates an enlarged view of a protrusion portion mounted in a support slot of Figure 20A; Figure 20C illustrates a cross-sectional view cut along line EE of Figure 20B; Figure 20D illustrates a first hinge plate in a folded electronic device according to one embodiment; Figure 20E illustrates a second hinge plate in a folded electronic device according to one embodiment; Figure 20F illustrates the operations of a hinge plate when an electronic device rotates from a closed state to an open state according to one embodiment; Figures 21A to 21C illustrate an opening / closing procedure for an electronic device according to one embodiment; Figure 22A illustrates a lid attached to a clamping portion of a support portion according to one embodiment; Figure 22B illustrates a cross-sectional view of a lid attached to a clamping portion of a support portion, cut along line GG of Figure 22A; Figure 22C illustrates a lid according to one embodiment; Figure 23A illustrates a tape attached to a first face of a support portion according to one embodiment; and Figure 23B illustrates a cross-sectional view, cut along line FF of Figure 20A, of a tape attached to a first face of a support portion according to one embodiment. Best way to carry out the invention From here on, various embodiments of the description will be described in detail with reference to the accompanying drawings. Figure 1 illustrates an electronic device 101 in a network environment 100 according to one embodiment. With reference to Figure 1, the electronic device 101 in network environment 100 can communicate with an electronic device 102 via a first network 198 (e.g., a short-range wireless communication network), or with an electronic device 104 or a server 108 via a second network 199 (e.g., a long-range wireless communication network). According to one embodiment, the electronic device 101 can communicate with the electronic device 104 via the server 108.According to one embodiment, the electronic device 101 may include a processor 120, a memory 130, an input module 150, a sound emission module 155, a display module 160, an audio module 170, a sensor module 176, an interface 177, a connection terminal 178, a haptic module 179, a camera module 180, a power management module 188, a battery 189, a communication module 190, a subscriber identification (SIM) module 196, or an antenna module 197. In some embodiments, at least one of the components (for example, the connection terminal 178) can be omitted from the electronic device 101, or one or more components can be added to the electronic device 101. In some embodiments, some of the components (for example, the sensor module 176, the camera module 180, or the antenna module 197) can be implemented as a single component (for example, the display module 160). The processor 120 can execute, for example, software (for example, a program 140) to control at least one other component (for example, a hardware or software component) of the electronic device 101 coupled with the processor 120, and can perform various data processing or calculations. According to one embodiment, as at least part of the data processing or calculation, the processor 120 can store a command or data received from another component (for example, the sensor module 176 or the communication module 190) in volatile memory 132, process the command or data stored in volatile memory 132, and store the resulting data in non-volatile memory 134.According to one embodiment, the processor 120 may include a main processor 121 (for example, a central processing unit (CPU) or an application processor (AP)), or an auxiliary processor 123 (for example, a graphics processing unit (GPU), a neural processing unit (NPU), an image signal processor (ISP), a sensor center processor, or a communication processor (CP)) that is operable independently of, or in conjunction with, the main processor 121. For example, when the electronic device 101 includes the main processor 121 and the auxiliary processor 123, the auxiliary processor 123 may be adapted to consume less power than the main processor 121, or to be specific to a specified function. The auxiliary processor 123 may be implemented separately, or as part of the main processor 121.The auxiliary processor 123 can control at least some of the functions or states related to at least one component (e.g., the display module 160, the sensor module 176, or the communication module 190) among the components of the electronic device 101, either in place of the main processor 121 while the main processor 121 is in an inactive state (e.g., suspended), or in conjunction with the main processor 121 while the main processor 121 is in an active state (e.g., running an application). According to one embodiment, the auxiliary processor 123 (e.g., an image signal processor or a communication processor) can be implemented as part of another component (e.g., the camera module 180 or the communication module 190) functionally related to the auxiliary processor 123. According to one embodiment, the auxiliary processor #23 (e.g., the neural processing unit) may include a specified hardware structure for processing artificial intelligence models. An artificial intelligence model may be generated by machine learning. Such learning may be performed, for example, by the electronic device #01 where the artificial intelligence is implemented or through a separate server (e.g., server #08). The learning algorithms may include, but are not limited to, supervised learning, unsupervised learning, half-supervised learning, or reinforcement learning. The artificial intelligence model may include a plurality of artificial neural network layers.The artificial neural network can be a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), a deep Q network, or a combination of two or more of these, but is not limited to them. The artificial intelligence model may also include a software structure distinct from the hardware structure. Memory 130 can store various data used by at least one component (for example, the processor 120 or the sensor module 176) of the electronic device 101. This data can include, for example, software (for example, program 140) and input or output data for a command associated with it. Memory 130 can include volatile memory 132 or non-volatile memory 134. Program 140 can be stored in memory 130 as software and can include, for example, an operating system (OS) 142, middleware 144, or an application 146. The input module 150 can receive a command or data to be used by another component (e.g., the processor 120) of the electronic device 101, from outside (e.g., a user) of the electronic device 101. The input module 150 can include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a light pen). The sound emission module 155 can emit sound signals to the outside of the electronic device 101. The sound emission module 155 may include, for example, a loudspeaker or a receiver. The loudspeaker may be used for general purposes, such as playing multimedia or discs. The receiver may be used to receive incoming calls. In one embodiment, the receiver may be implemented separately from, or as part of, the loudspeaker. The display module 160 can visually provide information to the outside (e.g., a user) of the electronic device 101. The display module 160 can include, for example, a display device, a hologram device, or a projector, and control circuitry for controlling one of the corresponding display devices, hologram device, and projector. According to one embodiment, the display module 160 can include a touch sensor adapted to detect a touch, or a pressure sensor adapted to measure the intensity of the force exerted by the touch. The audio module 170 can convert sound into an electrical signal and vice versa. According to one embodiment, the audio module 170 can receive sound via the input module 150, or output sound via the sound output module 155 or headphones of an external electronic device (e.g., electronic device 102) connected directly (e.g., by cable) or wirelessly to electronic device 101. The sensor module 176 can detect an operational state (e.g., power or temperature) of the electronic device 101 or an environmental state (e.g., a user state) external to the electronic device 101, and then generate an electrical signal or data value corresponding to the detected state. According to one embodiment, sensor module 176 may include, for example, a gesture sensor, a gyroscopic sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor. Interface 177 can support one or more specified protocols that will be used to allow electronic device 101 to interface with the external electronic device (e.g., electronic device 102) either directly (e.g., via cable) or wirelessly. According to one embodiment, interface 177 can include, for example, a High Definition Multimedia Interface (HDMI), a Universal Serial Bus (USB) interface, a Secure Digital Card (SD) interface, or an audio interface. A connection terminal 178 may include a connector through which the electronic device 101 can be physically connected to the external electronic device (e.g., electronic device 102). According to one embodiment, the connection terminal 178 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone jack). The haptic module 179 can convert an electrical signal into a mechanical (e.g., a vibration or movement) or electrical stimulus that can be recognized by a user through their tactile or kinesthetic sense. According to one embodiment, the haptic module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulator. The 180 camera module can capture still or moving images. Depending on the implementation, the 180 camera module may include one or more lenses, image sensors, image signal processors, or flashes. The power management module 188 can manage the power supplied to the electronic device 101. According to one embodiment, the power management module 188 can be implemented as at least a part of, for example, a power management integrated circuit (PMIC). Battery 189 can supply power to at least one component of electronic device 101. According to one embodiment, battery 189 can include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell. The communication module 190 can support the establishment of a direct (e.g., wired) or wireless communication channel between electronic device 101 and an external electronic device (e.g., electronic device 102, electronic device 104, or server 108) and perform communication over the established communication channel. The communication module 190 can include one or more communication processors that are operable independently of processor 120 (e.g., the AP) and support direct (e.g., wired) or wireless communication.According to one embodiment, the communication module 190 may include a wireless communication module 192 (for example, a cellular communication module, a short-range wireless communication module, or a Global Navigation Satellite System (GNSS) communication module) or a wired communication module 194 (for example, a local area network (LAN) communication module or a power line communication (PLC) module). A corresponding one of these communication modules may communicate with the external electronic device via the first network 198 (for example, a short-range communication network such as Bluetooth™, Wireless Fidelity (Wi-Fi) Direct, or IR Data Association (IrDA)) or the second network 199 (for example, a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g.).LAN or Wide Area Network (WAN). These various types of communication modules can be implemented as a single component (e.g., a single chip), or they can be implemented as multiple components (e.g., multiple chips) separate from each other. The wireless communication module 192 can identify and authenticate the electronic device 101 on a communication network, such as the first network 198 or the second network 199, by using subscriber information (e.g., the International Mobile Subscriber Identity (IMSI)) stored in the SIM 196. The 192 wireless communication module can support a 5G network, following a 4G network, and next-generation communication technologies, such as new radio access (NR) technologies. NR access technologies can support enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), or ultra-reliable low-latency communications (URLLC). The 192 wireless communication module can support a high-frequency band (e.g., mmWave) to achieve, for example, high data transmission rates. The 192 wireless communication module can support various technologies to ensure performance in a high-frequency band, such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), antenna aggregation, analog beamforming, or large-scale antennas.The wireless communication module 192 can support various requirements specified in electronic device 101, an external electronic device (e.g., electronic device 104), or a network system (e.g., a second network 199). According to one embodiment, the wireless communication module 192 can support a maximum data rate (e.g., 20 Gbps or more) to implement eMBB, a loss coverage (e.g., 164 dB or less) to implement mMTC, or a U-plane latency (e.g., 0.5 ms or less for each of the downlink (DL) and uplink (UL), or a round trip of 1 ms or less) to implement URLLC. The antenna module 197 can transmit or receive a signal or energy to or from the outside (e.g., the external electronic device) of the electronic device 101. According to one embodiment, the antenna module 197 can include an antenna comprising a radiating element made of a conductive material or pattern formed on or about a substrate (e.g., a printed circuit board (PCB)). According to one embodiment, the antenna module 197 can include a plurality of antennas (e.g., array antennas). In such an instance, at least one antenna suitable for a communication scheme used in the communication network, such as the first network 198 or the second network 199, can be selected, for example, by the communication module 190 (e.g., the wireless communication module 192) from the plurality of antennas.The signal or energy can then be transmitted or received between the communication module 190 and the external electronic device via at least one selected antenna. According to one embodiment, another component (for example, a radio frequency integrated circuit (RFIC)) other than the radiating element may be additionally formed as part of the antenna module 197. According to various embodiments, the 197 antenna module can form an mmWave antenna module. According to one embodiment, the mmWave antenna module can include a printed circuit board, an RFIC disposed on or adjacent to a first surface (e.g., the bottom surface) of the printed circuit board and capable of supporting a designated high-frequency band (e.g., the mmWave band), and a plurality of antennas (e.g., array antennas) disposed on or adjacent to a second surface (e.g., the top or side surface) of the printed circuit board and capable of transmitting or receiving signals from the designated high-frequency band. At least some of the components described above can be coupled together and communicate signals (e.g., commands or data) between them via a peripheral communication scheme (e.g., a bus, general purpose input / output (GPIO), serial peripheral interface (SPI), or mobile industrial processor interface (MIPI)). According to one embodiment, commands or data can be transmitted or received between electronic device 101 and external electronic device 104 via server 108 connected to the second network 199. Each of electronic devices 102 and 104 can be a device of the same type, or of different types, as electronic device 101. According to one embodiment, all or some of the operations to be performed on electronic device 101 can be performed on one or more of electronic devices 102, 104, or 108. For example, if electronic device 101 is to perform a function or service automatically, or in response to a request from a user or another device, electronic device 101, instead of, or in addition to, performing the function or service, can request 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 at least part of the requested function or service, or an additional function or service related to the request, and transfer a result of the performance to electronic device 101. Electronic device 101 may provide the result, with or without further processing of the result, as at least part of a response to the request. For this purpose, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technologies may be used. Electronic device 101 may provide ultra-low latency services using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device 104 may include an Internet of Things (IoT) device.Server 108 can be an intelligent server that uses machine learning and / or a neural network. According to one embodiment, the external electronic device 104 or the server 108 can be included in the second network 199. The electronic device 101 can be applied to smart services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology or IoT-related technology. According to various embodiments, an electronic device can be one of several types of electronic devices. Electronic devices can include, for example, a portable communication device (e.g., a smartphone), a computing device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a household appliance. According to one embodiment of the description, electronic devices are not limited to those described above. It should be noted that various embodiments of this description and the terms used herein are not intended to limit the technological characteristics set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. With respect to drawing descriptions, similar reference numbers may be used to refer to similar or related items. It should be understood that a singular form of a noun corresponding to an item may include one or more of the items, unless the relevant context clearly indicates otherwise. As used herein, each of the phrases such as "A or B," "at least one of A and B," "at least one of A or B," "A, B, or C," "at least one of A, B, and C," and "at least one of A, B, or C" may include all possible combinations of the items listed together in one of the corresponding phrases.As used in this document, terms such as "1st" and "2nd" may simply be used to distinguish one corresponding component from another and do not limit the components in any other respect (e.g., importance or order). It should be understood that if an element (e.g., a first element) is referred to, with or without the term "operationally" or "communicatively," as "coupled with," "coupled to," "connected to," or "connected to" another element (e.g., a second element), it means that the element may be coupled to the other element directly (e.g., by cable), wirelessly, or through a third element. As used in connection with various embodiments of the description, the term "module" can include a unit implemented in hardware, software, or firmware, and can be used interchangeably with other terms, for example, "logic," "logic block," "part," or "circuits." A module may be a single integral component, or a minimal unit or part thereof, adapted to perform one or more functions. For example, according to one embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC). Various embodiments, as discussed in this document, can be implemented as software (e.g., program 140) that includes one or more instructions stored in a storage medium (e.g., internal memory 136 or external memory 138) that is readable by a machine (e.g., electronic device 101). For example, a processor (e.g., processor 120) of the machine (e.g., electronic device 101) can invoke at least one of the one or more instructions stored in the storage medium and execute it, with or without using one or more components under the processor's control. This allows the machine to be operated to perform at least one function according to the invoked instruction. The one or more instructions may include code generated by a compiler or code executable by an interpreter.Machine-readable storage media can be provided in the form of non-transient storage. The term "non-transient" simply means that the storage medium is a tangible device and does not include a signal (e.g., an electromagnetic wave), but this term does not distinguish between cases where data is stored semi-permanently on the storage medium and cases where data is stored temporarily. According to one embodiment, a method according to various embodiments of the description can be included and provided in a software product. The software product can be marketed as a product between a seller and a buyer. The software product can be distributed in the form of a machine-readable storage medium (e.g., a compact disc (CD-ROM) read-only memory), or it can be distributed (e.g., downloaded or uploaded) online through an application store (e.g., Play Store™), or directly between two user devices (e.g., smartphones). If distributed online, at least a portion of the software product can be temporarily generated or at least temporarily stored on the machine-readable storage medium, such as the memory of the manufacturer's server, an application store server, or a relay server. According to various embodiments, each component (e.g., a module or a program) of the components described above may include a single entity or multiple entities, and some of the multiple entities may be arranged separately in different components. According to various embodiments, one or more of the components described above may be omitted, or one or more other components may be added. Alternatively or additionally, a plurality of components (e.g., modules or programs) may be integrated into a single component. In such a case, according to various embodiments, the integrated component may continue to perform one or more functions of each of the plurality of components in the same or similar manner as they are performed by a corresponding component of the plurality before integration.According to certain realizations, the operations performed by the module, the program, or another component may be performed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be executed in a different order or omitted, or one or more different operations may be added. Figures 2A to 2C illustrate a foldable electronic device in a folded state according to one embodiment. Specifically, Figure 2A illustrates a perspective view, Figure 2B illustrates a front view, and Figure 2C illustrates a rear view. Figures 3A to 3C illustrate a foldable electronic device in a 180-degree unfolded state according to one embodiment. Specifically, Figure 3A illustrates a perspective view, Figure 3B illustrates a front view, and Figure 3C illustrates a rear view. With reference to Figures 2A to 3C, an electronic device 101 includes a foldable housing 210 (or a "housing") comprising a first housing 211 and a second housing 212, a flexible display device 220, a hinge assembly 300, and a cover 230 (or a "back cover"). The cover 230 includes a first cover 2301 enclosed in the first housing 211 and a second cover 2302 enclosed in the second housing 212. The first housing 211 and the second housing 212 can form a space in which electronic components (e.g., a PCB, a battery, a processor, etc.) of the electronic device 101 can be arranged, and can form a side face of the electronic device 101. Various types of components for performing various functions of the electronic device 101 can be arranged within the first housing 211 and the second housing 212. For example, a front camera, a receiver, a sensor (e.g., a proximity sensor), etc., can be arranged within the first housing 211 and the second housing 212. Electronic components can also be exposed to a front face of the electronic device 101 through at least one opening 220d or recess prepared in the flexible display device 220. The first housing 211 and the second housing 212 can be arranged in parallel with each other when the electronic device 101 is in an extended state. When the electronic device 101 is in the folded state, the first housing 211 can be rotated (or turned) with respect to the second housing 212, such that one face of the first housing 211 is oriented towards a face of the second housing 212. The first housing 211 and the second housing 212 can form a recess to accommodate the flexible display device 220, and the flexible display device 220 can be supported by the first housing 211 and the second housing 212 when mounted in the recess. The flexible display device 220 is supported by a first support plate and / or a second support plate located between the flexible display device 220 and the first and second housings 211 and 212, as described later with reference to Figure 4A. The first housing 211 and the second housing 212 can be made of a metallic and / or non-metallic material having a specified rigidity to support the flexible display device 220. The flexible display device 220 is positioned over the first housing 211 and the second housing 212 to form a front face of the electronic device 101 when the electronic device 101 is in the deployed state. Specifically, the flexible display device 220 can be positioned extending to at least a portion of the second housing 212 via the hinge assembly 300 from a portion of the first housing 211. The flexible display device 220 can be positioned over the first housing 211 and the second housing 212 by mounting it in the recess formed by the first housing 211 and the second housing 212. The flexible display device 220 includes a first region 220a corresponding to at least one region of the first housing 211, a second region 220b corresponding to at least one region of the second housing 212, and a folding region 220c located between the first region 220a and the second region 220b and having a flexible characteristic. However, the description is not limited to the embodiment mentioned above, and the first region 220a, the second region 220b, and the folding region 220c of the flexible display device 220 can be formed to have the flexible characteristic. The first region 220a, the folding region 220c, and the second region 220b can be arranged in parallel to orient themselves in the same direction when the electronic device 101 is in the deployed state.When the electronic device 101 is in the folded state, the folding region 220c can be folded in such a way that the first region 220a and the second region 220b are arranged opposite each other. At least one region (for example, the first region 220a, the second region 220b) of the flexible display device 220 may be fixed to one face of the first housing 211 and one face of the second housing 212. Alternatively, the flexible display device 220 may be fixed to one face of the first housing 211 and one face of the second housing 212 via the support plates 221 and 222 located between the flexible display device 220 and the first and second housings 211 and 212. Support plates 221 and 222 comprise the first support plate 221 attached to at least a portion of the first housing 211 to support the first region 220a of the flexible display device 220, and the second support plate 222 attached to at least a portion of the second housing 212 to support the second region 220b of the flexible display device 220. The first support plate 221 is attached to at least a portion of the first region 220a of the flexible display device 220 to support the flexible display device 220. Similarly, the second support plate 222 is attached to at least a portion of the second region 220b of the flexible display device 220 to support the flexible display device 220. The first support plate 221 and the second support plate 222 may be formed of a material having sufficient rigidity to support the flexible display device 220. The hinge assembly 300 engages the first housing 211 and the second housing 212, and can rotate the second housing 212 around the first housing 211 within a specified rotation range, or, conversely, can rotate the first housing 211 around the second housing 212 within a specified rotation range. A recess 211c can be formed in a region where the first housing 211 and the second housing 212 are coupled, such that the hinge assembly 300 is arranged between the first housing 211 and the second housing 212. The aforementioned recess 211c can be designed in the form of a groove having a specific cover, but is not limited to this. A hinge housing 300c can be arranged between the first and second housings 211 and 212, and the hinge assembly 300 can be assembled to the hinge housing 300c. The hinge housing 300c can be visible from outside the electronic device 101 depending on the state of the electronic device 101, or it can be hidden by the folding housing 210. For example, with reference to Figure 3C, when the electronic device 101 is in the unfolded state, the hinge housing 300c is hidden by the folding housing 210 and, therefore, can be invisible from outside the electronic device 101. As another example, as illustrated in Figures 2A to 2C, when the electronic device 101 is in the folded state, the hinge housing 300c can be visible from outside the electronic device 101 due to a rotation of the first housing 211 and the second housing 212.Cover 230 can be located at a lower end of the first housing 211 and the second housing 212 to form a back face of the electronic device 101. Cover 230 can include the first cover 2301 coupled to the first housing 211 and the second cover 2302 coupled to the second housing 212. The first cover and housing 211 can be integrally formed, and the second cover and housing 212 can also be integrally formed. Figure 4A illustrates an exploded view of an electronic device in its unfolded state according to one embodiment. Figure 4B illustrates an exploded perspective view showing the internal structure of an electronic device according to one embodiment. With reference to Figures 4A and 4B, a foldable electronic device includes a flexible display device 220, the first and second housings 211 and 212, a hinge assembly 300, batteries B1 and B2, and at least one PCB 224. A folding housing 210 may include a first housing 211 and a second housing 212. The first and second housings 211 and 212 may be physically coupled by means of the hinge assembly 300 in a rotatable manner. The first housing 211 may include a first side element 211a and a first cover 2301 coupled to the first side element 211a, and the second housing 212 may include a second side element 212a and a second cover 2302 coupled to the second side element 212a. The first battery B1 is arranged in the first housing 211 and the second battery B2 is arranged in the second housing 212. The second battery B2 may have a greater capacity than the first battery B1, and may be heavier than the first battery B1. The PCB may include a main PCB and an auxiliary PCB for electrically coupling at least a first electronic component disposed in the first slot 211 and at least a second electronic component disposed in the second slot 212. For example, the sub PCB may be an FPCB disposed across the hinge slot 300c. The hinge assembly 300 includes hinge structures 300a and 300b. Hinge structures 300a and 300b are arranged in a hinge housing 300c. The first and second hinge plates 300d and 300e are arranged in the first and second housings 211 and 212, respectively. A cap "c" can be attached to a support portion of the hinge structure. Hinge structures 300a and 300b provide a rotation axis for the first and second housings 211 and 212 and can provide force to maintain an electronic device at a specific angle, for example, 0, 45, 90, or 180 degrees. Figures 5A to 5C illustrate an opening / closing procedure for an electronic device according to one embodiment. Specifically, Figure 5A illustrates a perspective view of a folded state, Figure 5B illustrates a perspective view of an open state of approximately 90 degrees, and Figure 5C illustrates a perspective view of an open state of approximately 180 degrees. With reference to Figures 5A to 5C, a hinge assembly 300 included in an electronic device 101 is in a folded (closed) state in Figure 5A, in an unfolded (open) state of 180 degrees in Figure 5C, and in an unfolded (open) state of approximately 90 degrees in Figure 5B. The hinge assembly 300 can provide a force capable of maintaining a closed state, a 180-degree open state, or an approximately 90-degree open state through cam operation during an opening / closing cycle. For example, the operation of the hinge assembly 300 can be provided by a mutual cam operation between hinge cams included in a hinge structure. The holding force can be provided at various degrees of opening / closing of the electronic device 101 by changing the shape of the hinge cam. Figure 6 illustrates an exploded perspective view of a hinge structure according to one embodiment. With reference to Figure 6, a hinge structure 300a or 300b includes a support structure 310, an arm structure 320, a rotation structure 330, a retention structure 340, a support portion 350, a stop 360, a spring element 361, and a screw 362. At least one of the components of the hinge structure 300a or 300b of Figure 6 may be identical or similar to at least one of the components of the structure 300a or 300b of Figure 4, and redundant descriptions will be omitted hereafter. The support structure 310 includes a first support 311, a second support 312, and a fixing support 313. The mounting bracket 313 may be arranged in a hinge housing to support the first bracket 311 and the second bracket 312. A first slot 313a and a second slot 313b may be formed on a top face of the mounting bracket 313 (for example, a face of the +y direction), and the first bracket 311 and the second bracket 312 may be coupled to the mounting bracket 313 via the first slot 313a and the second slot 313b. The first slot 313a and the second slot 313b may be designed in an arc shape having a specific curvature; the first bracket 311 may be coupled to the first slot 313a, and the second bracket 312 may be coupled to the second slot 313b. Although the first slot 313a and the second slot 313b are designed in an arc shape with the same curvature, in Figure 6, the first slot 313a and the second slot 313b can be designed in an arc shape having different curvatures.The first slot 313a can be formed in a region (for example, a region in the +x direction) of the mounting bracket 313 adjacent to the first bracket 311, and the second slot 313b can be formed in another region of the mounting bracket 313 adjacent to the second bracket 312. A plurality of gear holes 313d and a plurality of shaft holes 313e can be formed on a side face (e.g., a +z direction face) of the mounting bracket 313. The first and second idle gears 333 and 334 can be attached to the first and second shafts 331 and 332 on a side face of the mounting bracket 313 through the aforementioned gear hole 313d and shaft hole 313e. The first support 311 includes a first rail portion 311a, a first sliding hole 311b, and a plurality of mating holes 311c. The first rail portion 311a may be designed to protrude from a region of the first support 311. The first rail portion 311a may be shaped to correspond to the first groove 313a of the mounting bracket 313, and the first support 311 may be mated to the first groove 313a of the mounting bracket 313 via the first rail portion 311a. The first sliding hole 311b may be formed in a region of the first support 311 adjacent to a first arm 321, and the first support 311 and the first arm 321 may be mated via a first mounting portion 323 that passes through the first sliding hole 311b and the first arm 321.The first attachment portion 323 can slide into the first sliding hole 311b as the electronic device rotates from the folded state to the unfolded state or rotates from the unfolded state to the folded state. The plurality of mating holes 311c can be formed on a face (for example, a face in the +y direction) oriented towards a first housing of the first support 311, and the first support 311 can be mated to a region of the first housing via the plurality of mating holes 311c. The first support 311 mated to the first housing can slide along the first groove 313a of the mounting support 313 with the rotation of the first housing, and can rotate about a first virtual rotation axis L1. The second support 312 includes a second rail portion 312a, a second sliding hole 312b, and a plurality of mating holes 312c. The second rail portion 312a may be designed to protrude from a region of the second support 312. The second rail portion 312a may be shaped to correspond to the second groove 313b of the mounting support 313, and the second support 312 may be mated to the second groove 313b of the mounting support 313 via the second rail portion 312a. The second sliding hole 312b may be formed in a region of the second support 312 adjacent to a second arm 322, and the second support 312 and the second arm 322 may be mated via a second mounting portion 324 that passes through the second sliding hole 312b of the second arm 322.The second attachment portion 324 can slide into the second sliding hole 312b as the electronic device rotates from the folded state to the unfolded state or from the unfolded state to the folded state. The plurality of mating holes 312c can be formed on a face (e.g., a face in the +y direction) oriented toward a second housing of the second support 312, and the second support 312 can be mated to a region of the second housing via the plurality of mating holes 312c. The second support 312 mated to the second housing can slide along the second groove 313b of the mounting support 313 with the rotation of the second housing, and can rotate about a second virtual rotation axis L2. In this case, the first virtual rotation axis L1 and the second virtual rotation axis L2 are parallel, and can be formed on a flat face parallel to the flexible display device when the electronic device is in the folded state. The 320 arm structure includes the first arm 321 and the second arm 322. The first arm 321 includes a first cam portion 321a, a first support rib 321b, a first insertion hole 321c, and a first through hole 321d. The first insertion hole 321c can be formed in a region of a lower end (e.g., the -y direction) of the first arm 321, and the first shaft 331, described later, can be inserted into the first insertion hole 321c to couple the first arm 321 and the first shaft 331. Because the first arm 321 and the first shaft 331 are coupled, the first arm 321 can rotate about an axis of rotation of the first shaft 331. The first cam portion 321a may be formed in a region adjacent to the first insertion hole 321c and may be designed to project in one direction from a retaining plate 341 (for example, the +z direction). The first cam portion 321a may be designed in a concave-convex shape in which a plurality of peaks and valleys are repeated, and the first cam portion 321a may be arranged to be applied with a retaining portion 341a formed in the retaining plate 341 to provide cam operation to the first arm 321. Furthermore, since the first cam portion 321a may be arranged to be applied with the retaining portion 341a formed in the retaining plate 341, the first arm 321 may be fixed at a specified angle of rotation and / or within a specified angle of rotation range.As a result, a movement of the electronic device can be fixed at the specified rotation angle and / or within the specified rotation angle range (e.g., the range from 30° to 150°). The first support rib 321b may be designed to protrude from a region of the first arm 321 and may move the support portion 350 in an upward direction (for example, the +y direction) when the electronic device rotates from the folded to the unfolded state. The first through-hole 321d may be formed in a region (for example, a region in the +x direction) on the opposite side of a region in which the first insertion hole 321c of the first arm 321 is formed. The first fastening portion 323, which passes through the first sliding hole 311b, may pass through the first through-hole 321d to couple the first support 311 and the first arm 321. A first washer ring 325 may be attached to one end of the first fastening portion that passes through the first through-hole 321d, so that the first fastening portion 323 is attached to the first arm 321. Alternatively, the first washer ring 325 can be attached to the other end of the first fixing portion 323, so that the first fixing portion 323 is fixed to the first support 311. Furthermore, a protrusion can be formed in a region of the first support 311 (or the first arm 321), and a corresponding mating groove can be formed in a region of the first arm 321 (or the first support 311) such that the first support 311 and the first arm 321 are mated to the protrusion via the mating groove. The first arm 321, mated to the first support 311, can rotate about a different axis of rotation than that of the first support 311 while simultaneously sliding relative to the first support 311, as the electronic device rotates from the folded to the unfolded state or vice versa. The second arm 322 includes a second cam portion 322a, a second support rib 322b, a second insertion hole 322c, and a second through hole 322d. The second insertion hole 322c may be formed in a region of a lower end (e.g., the -y direction) of the second arm 322, and the second shaft 332, described later, may be inserted into the second insertion hole 322c to couple the second arm 322 and the second shaft 332. When the second arm 322 and the second shaft 332 are coupled, the second arm 322 can rotate about an axis of rotation of the second shaft 332. The second cam portion 322a may be formed in a region adjacent to the second insertion hole 322c and may be designed to project in a direction from the retaining plate 341 (e.g., the +z direction).Similar to the first cam portion 321a, the second cam portion 322a may be designed in a concave-convex shape in which a plurality of peaks and valleys are repeated, and the second cam portion 322a may be arranged to be applied with a retaining portion 341b formed in the retaining plate 341 to provide cam operation to the second arm 322. Furthermore, since the second cam portion 322a may be arranged to be applied with the retaining portion 341b formed in the retaining plate 341, the second arm 322 may be fixed at a specified angle of rotation and / or within a specified range of rotation angles. As a result, a movement of the electronic device may be fixed at the specified angle of rotation and / or within the specified range of rotation angles (e.g., the range from 30° to 150°). The second support rib 322b may be designed to protrude from a region of the second arm 322 and may move the support portion 350 in an upward direction (e.g., the +y direction) when the electronic device rotates from the folded to the unfolded state. The second through-hole 322d may be formed in a region on the opposite side of the second insertion hole 322c. The second fastening portion 324 that passes through the second sliding hole 312b may pass through the second through-hole 322d to couple the second support 312 and the second arm 322. A second washer ring 326 may be attached to one end of the second fastening portion that passes through the second through-hole 322d, so that the second fastening portion 324 is secured to the second arm 322.Alternatively, the second washer ring 326 can be attached to the other end of the second fixing portion 324, so that the second fixing portion 324 is fixed to the second support 312. Furthermore, a protrusion can be formed in a region of the second support 312 (or the second arm 322), and a corresponding mating groove can be formed in a region of the second arm 322 (or the second support 312) such that the second support 312 and the second arm 322 are mated to the protrusion via the mating groove. The second arm 322, mated to the second support 312, can rotate about a different axis of rotation than the first support 312 while sliding relative to the second support 312, while the electronic device rotates from the folded to the unfolded state or from the unfolded to the folded state. The rotating structure 330 includes the first shaft 331 coupled with a first gear 331a, the second shaft 332 coupled with a second gear 332a, the first idle gear 333, the second idle gear 334, a shaft support 335, and a gear cover 336. One end of the first shaft 331 can be attached to the shaft hole 313e of the mounting bracket 313, and the other end of the first shaft 331 can pass through a first shaft insertion hole 335a of the shaft bracket 335. The first arm 321 can be coupled to a region of the first shaft 331, and the first arm 321 can rotate about the first shaft 331 as the axis of rotation. The second shaft 332 can be arranged in a position adjacent to the first shaft 331. One end of the second shaft 332 can be attached to the shaft hole 313e of the mounting bracket 313, and the other end of the second shaft 332 can pass through a second shaft insertion hole 335b of the shaft bracket 335. The second arm 322 can be coupled to a region of the second shaft 332, and the second arm 322 can rotate about the second shaft 332 as the axis of rotation. The first idle gear 333 and the second idle gear 334 can be arranged between the first gear 331a coupled to the first shaft 331 and the second gear 332a coupled to the second shaft 332. The first idle gear 333 and the second idle gear 334 can be secured to the plurality of gear holes 313d of the mounting bracket 313, and the first idle gear 333 and the second idle gear 334 can be rotated in conjunction with each other so that the first arm 321 and the second arm 322 rotate at the same angle. The first idle gear 333 can be rotated in conjunction with the first idle gear 331a and the second idle gear 334, and the second idle gear 334 can be rotated in conjunction with the first idle gear 333 and the second idle gear 332a. When the first gear 331, the second gear 332a, the first idle gear 333, and the second idle gear 334 are meshed together and rotate at the same angle, the first shaft 331 and the second shaft 332 can rotate at the same angle in opposite directions. When the first shaft 331 rotates 30° counterclockwise (e.g., from the +x axis to the +y axis), the second shaft 332 can rotate 30° clockwise. When the first shaft 331 and the second shaft 332 rotate at the same angle, the first arm 321 and the second arm 322, coupled to the first shaft 331 and the second shaft 332, can rotate at the same angle. The tree support 335 may include the first tree insertion hole 335a into which the first tree 331 is inserted and the second tree hole 335b into which the second tree 332 is inserted. The tree support 335 may be arranged within a hinge housing to support the first tree 331 and the second tree 332 inserted into the tree support 335 through the first tree hole 335a and the second tree hole 335b. Gear cover 336 can be inserted onto the first shaft 331 and the second shaft 332 to protect the first gear 331a, the second gear 332a, the first idle gear 333, and the second idle gear 334. Gear cover 336 prevents damage to the first gear 331a, the second gear 332a, the first idle gear 333, and the second idle gear 334 from external forces, and prevents foreign material from entering the first gear 331a, the second gear 332a, the first idle gear 333, and the second idle gear 334. The retention structure 340 includes the retention plate 341, a first spring 342, and a second spring 343. A third shaft insertion hole 341c into which the first shaft 331 is inserted may be formed in a region of the retaining plate 341, and a fourth shaft insertion hole 341d into which the second shaft 332 is inserted may be formed in another region of the retaining plate 341. The retaining plate 341 may be engaged with the first shaft 331 and the second shaft 332 through the third shaft insertion hole 341c and the fourth shaft insertion hole 341d. The retaining plate 341 includes the first retaining portion 341a, which is designed to project in one direction from the first cam portion 321a of the first arm 321, and the second retaining portion 341b, which is designed to project in one direction from the second cam portion 322a of the second arm 322.The first retaining portion 341a and the second retaining portion 341b may be designed in a concave-convex structure in which at least one peak and one valley appear repeatedly. The first retaining portion 341a may be arranged to engage with the first cam portion 321a, and thus, when the electronic device is in the folded or unfolded state, it can provide cam operation to the first arm 321 and fix a movement of the first arm 321 at a specified angle of rotation. Similarly, the second retaining portion 341b may be arranged to engage with the second cam portion 322a, and thus, when the electronic device is in the folded or unfolded state, it can provide cam operation to the second arm 322 and fix a movement of the second arm at a specified angle of rotation. The pitch between peaks or valleys of the first retaining portion 341a may be greater than the pitch between peaks or valleys of the first cam portion 321a, so that the first arm 321 can rotate within a specified range of rotation even when the first retaining portion 341a and the first cam portion 321a are engaged. However, the shape of the first retaining portion 341a is not limited to the example above. The pitch between peaks or valleys of the first retaining portion 341a may be shaped to be identical to the pitch between peaks or valleys of the first cam portion 321a, or the pitch between peaks or valleys of the first cam portion 321a may be shaped to be greater than the pitch between peaks or valleys of the first retaining portion 341a. Similarly, the pitch between peaks or valleys of the second retaining portion 341b may be greater than the pitch between peaks or valleys of the second cam portion 322a, so that the second arm 322 can rotate within a specified rotational range even when the second retaining portion 341b and the second cam portion 322a are engaged. However, the shape of the second retaining portion 341b is not limited to the example above. The pitch between peaks or valleys of the second retaining portion 341b may be shaped to be identical to the pitch between peaks or valleys of the second cam portion 322a, or the pitch between peaks or valleys of the second cam portion 322a may be shaped to be greater than the pitch between peaks or valleys of the second retaining portion 341b. The first spring 342 can be arranged to surround a region of the first shaft 331, and the second spring 343 can be arranged to surround a region of the second shaft 332. The first spring 342 and the second spring 343 can be arranged in a state of being compressed between the retaining plate 341 and the shaft support 335, such that the retaining plate 341 is in close contact in one direction with the first arm 321 and the second arm 322. When the retaining plate 341 is in close contact in one direction with the first arm 321 and the second arm 322, it is possible to maintain a state in which the first retaining portion 341a and the first cam portion 321a are engaged and a state in which the second retaining portion 341b and the second cam portion 322a are engaged. When the peak of the first retaining portion 341a and the peak of the first cam portion 321a, or the peak of the second retaining portion 341b and the peak of the second cam portion 322a, are in contact due to rotation of the first arm 321 and the second arm 322, the retaining plate 341 can move in one direction relative to the first shaft 331 and the second shaft 332 (for example, the +z direction), so that the first cam portion 321a and the first retaining portion 341a, and / or the second cam portion 322a and the second retaining portion 341b, are temporarily separated. When the retaining plate 341 moves in one direction, the first spring 342 and the second spring 343 can be compressed.When the first arm 321 and the second arm 322 are further rotated through a specific angle, the retaining plate 341 can move back in a direction of the first cam portion 321a and / or the second cam portion 322a due to the elastic restoring force of the first spring 342 and the second spring 343. As a result, the first cam portion 321a and the first retaining portion 341a can be arranged in a state of being applied again with the second cam portion 322a and the second retaining portion 341b, thus maintaining a state in which the first cam portion 321a and the first retaining portion 341a are applied and the second cam portion 322a and the second retaining portion 341b are applied. A flat linear region may form in at least one region (e.g., a peak region) of the peak of the first cam portion 321a, the peak of the second cam portion 322a, the peak of the first holding portion 341a, and / or the peak of the second holding portion 341b. Similarly, a flat linear region may also form in at least one region of the valley of the first cam portion 321a, the valley of the second cam portion 322a, the valley of the first holding portion 341a, and / or the valley of the second holding portion 341b. The linear region formed in a peak region and the linear region formed in a valley region may be substantially identical or similar.Since the linear region is formed at the peaks and valleys of the first cam portion 321, the second cam portion 322a, the first retaining portion 341a, and the second retaining portion 341b, a movement of the first arm 321 and / or the second arm 322 can be fixed at a specified rotation angle (e.g., 30° or 60°) and / or within a specified rotation angle range (e.g., a rotation angle range from 30° to 150°). When the movement of the first arm 321 and / or the second arm 322 is fixed at the specified rotation angle, a movement of a first housing and a second housing of the electronic device can be fixed at the specified rotation angle. The support portion 350 can be positioned in an empty space between the first and second arms 321 and 322 and the first and second trees 321 and 332. When the electronic device is in an deployed state, the support portion 350 can support a region of a flexible display device not supported by the first arm 321 and / or the second arm 322. The support portion 350 can be moved in an upward direction (e.g., the +y direction) using the first arm rib 321b formed in a region of the first arm 321 and the second support rib 322b formed in a region of the second arm 322.While the electronic device rotates from the folded state to the unfolded state, the first support rib 321b and the second support rib 322b may be in contact with a region of the support portion 350, and the support portion 350 may be moved in a top direction (e.g., in a direction from the -y axis to the +y axis) by the first support rib 321b and the second support rib 322b with the rotation of the first arm 321 and the second arm 322. The 360 ​​stop can be located at a lower end of the 350 support portion (e.g., the -y direction). A fifth shaft insertion hole 360a can be formed in a region of the 360 ​​stop, and a sixth shaft insertion hole 360b can be formed in a region on the opposite side of the fifth shaft insertion hole 360a. The first shaft 331 and the second shaft 332 can be inserted through the fifth shaft insertion hole 360a and the sixth shaft insertion hole 360b, and the first shaft 331, the second shaft 332, and the 360 ​​stop can be coupled through the aforementioned structure. A through hole 360c can be formed in a region of an upper end of the 360 ​​stop (e.g., the +y direction), and a spring support portion 3505 of the support portion 350 can be inserted in a lower direction of the 360 ​​stop by passing through the through hole 360c. The screw 362 may be coupled with the elastic support portion 3505 inserted into the lower end of the stop 360, and the elastic element 361 may be arranged between the screw 362 and the stop 360. The elastic element 361 may be a spring, but is not limited to it. The elastic element 361 may be in contact with a region of the stop 360, and the elastic element 361 may be compressed as the support portion 350 moves in an upward direction while the electronic device rotates from the folded to the unfolded state. While the electronic device rotates from the unfolded to the folded state, the support portion 350 may move in a downward direction (e.g., the -y direction) due to the elastic restoring force of the elastic element 361. The hinge structure 300a or 300b further includes a first auxiliary element 363 and a second auxiliary element 364. The first auxiliary element 363 can be attached to one end of the first shaft 331 adjacent to the shaft support 335, and the second auxiliary element 364 can be attached to one end of the second shaft 332 adjacent to the shaft support 335. A third washer ring 331b can be attached to one end of the first shaft 331, and thus the first shaft 331 can be fixed to the first auxiliary element 363. Similarly, a fourth washer ring 332b can be attached to one end of the second shaft 332, and thus the second shaft 332 can be fixed to the second auxiliary element 364.A screw nut can be attached to one end of the first shaft 331 so that the first shaft 331 is fixed to the first auxiliary element 363, or a screw nut can also be attached to one end of the second shaft 332 so that the second shaft 332 is fixed to the second auxiliary element 364. The first auxiliary element 363 includes a third support rib 363a, and the third support rib 363a may be designed to project from a region of the first auxiliary element 363. The second auxiliary element 364 includes a fourth support rib 364a, and the fourth support rib 364a may be designed to project from a region of the second auxiliary element 364. The first auxiliary element 363 can rotate with the same angle of rotation as the first arm 321 through the first shaft 331, and the second auxiliary element 364 can rotate with the same angle of rotation as the second arm 322 through the second shaft 332.When the electronic device rotates from the folded state to the unfolded state, the third support rib 363a and the fourth support rib 364a can allow the support portion 350 to move in an upward direction together with the first support rib 321b of the first arm 321 and the second support rib 322b of the second arm 322. Figure 7A is a perspective view illustrating a support portion according to one embodiment, Figure 7B is a plan view illustrating a support portion according to one embodiment, and Figure 7C is a side view illustrating a support portion according to one embodiment. With reference to Figures 7A to 7C, a 350 portion of support supports a flexible display device when the flexible display device is deployed, and may have an approximately bar-like shape. The 350 support portion supports folding the flexible display device and can be positioned to face the folding region. The 350 support portion supports the folding region so that it is flat in a 180-degree deployed (open) state and can be moved away from the folding region during a folding operation (a closing operation). The support portion 350 may be of the bar type, having a length and being positioned between the hinge structures 300a and 300b. The support portion 350 includes a first face 350a and a second face 350b oriented opposite to the first face 350a. The first face 350a may be oriented towards the flexible display device, and the second face 350b may be oriented towards the hinge housing. The support portion 350 is a connector that links the first and second hinge structures, and both ends of the support portion 350 can be attached to the first and second structures, respectively. The support portion 350 includes a center portion 3501, a clamping portion 3502, a hook portion 3504, an elastic support portion 3505, and ends 3506. On the support portion 350, the clamping portions 3502 can be positioned on either side of the center portion 3501, the hook portions 3504 can be positioned on either side of the clamping portion, the elastic support portions 3505 can be positioned on either side of the hook portion 3504, and the ends 3506 can be positioned on opposite sides of the elastic support portion 3505. The central portion 3501 may be located between the first and second hinge structures, may be located between the first and second hinges, or may be located between an FPCB and a folding region of the flexible display device. In the central portion 3501, the first face 3501a can be oriented toward the folding region of the flexible display device, and the second face 3501b can be oriented toward the hinge housing. The central portion 3501 is positioned in a space between the first and second hinge plates to support the flexible display device so that it lies flat when the electronic device is in a 180-degree unfolded state, acting as a support element for the flexible display device. The clamping portion 3502 may be a clamping hole into which a fastener is inserted. The hook portion 3504 may have a hook shape projecting from the second face 350b. The hook portion 3504 may be caught by some support structures of the hinge housing, so that the support portion 350 is constrained from separating from the hinge housing. The spring support portion 3505 may be cylindrical, such as a portion in which a spring is housed. The ends 3506 may have the narrowest widths in the support portion 350. The center portion 3501 of the support portion 350 may be designed to have a smaller width than the clamping portion 3502, the hook portion 3504, or the spring support portion 3505, and may be designed to have a greater thickness. The support portion 350 includes a plurality of first support grooves 3503 on the first face 350a. The plurality of support grooves 3503 can be grooves for mounting the first and second protrusion portions of the first and second hinge plates. The plurality of support grooves 3503 can be bilaterally symmetrical on both sides with respect to the center portion 3501, and can be symmetrically symmetrical on the top and bottom sides. The support portion 350 can be made of a metallic material, for example, a Stainless Steel (SUS) material or a metal powder material. Figure 8A illustrates a hinge assembly attached to an deployed electronic device according to one embodiment. Figure 8B is a plan view illustrating a hinge structure according to one embodiment. With reference to Figures 8A and 8B, a hinge structure 300a or 300b includes a support structure 310, an arm structure 320, a rotation structure 330, a retention structure 340, and a support portion 350. The support structure 310 includes a plurality of supports 311 and 312 coupled with a first housing and a second housing, and a fixing support 313 supporting the plurality of supports 311 and 312. The plurality of supports 311 and 312 coupled with the first and second housings can rotate together with the first and second housings as the electronic device rotates from a folded state to an unfolded state or from an unfolded state to a folded state. The arm structure 320 may include an arm coupled to some constituencies (e.g., a shaft) of the rotation structure 330 and capable of rotating within a specified range (e.g., 0° to 90° or 10° to 80°). The arm may be coupled to a region of a support of the support structure 310 and, therefore, may slide relative to the support during a rotation process of the electronic device. The rotating structure 330 includes a plurality of shafts 331 and 332, a plurality of gears 331a and 332a coupled to the plurality of shafts 331 and 332, a plurality of idle gears 333 and 334 coupled to the plurality of gears 331a and 332a, and a shaft support supporting the plurality of shafts. Because the plurality of shafts 331 and 332, the plurality of gears 331a and 332a, and the plurality of idle gears 333 and 334 rotate in a coupled fashion, the rotating structure 330 can allow the first and second housings to rotate at the same angle. The arms 321 and 322 of the arm structure 320 can be coupled to the shafts 331 and 332 of the rotating structure 330.Consequently, the arm can rotate around a different rotation axis (or pivot axis) from supports 311 and 312 of the support structure 310 while the electronic device rotates from the folded state to the unfolded state or from the unfolded state to the folded state. The retaining structure 340 includes a retaining plate 341 having a retaining portion formed thereon, and a plurality of springs 342 and 343. The retaining portion may be designed to protrude from a region of the retaining plate 341 facing the aforementioned arm. The retaining portion may be designed in a concave-convex shape corresponding to a cam portion formed in a region of the arms 321 and 322. The retaining portion may be engaged with the cam portion of the arms 321 and 322 to fix a movement of the arm when the electronic device is in the folded state. The plurality of springs 342 and 343 may be arranged between the retaining plate 341 and the shaft support of the rotating structure 330.The plurality of springs 342 and 343 can be arranged between the retaining plate 341 and the shaft support in a compressed state, so that the retaining plate 341 is in contact with a region of the arms 321 and 322. The support portion 350 can be arranged in an empty space between the plurality of arms 321 and 322 and the plurality of shafts 331 and 332. The support portion 350 can move up and down between the flexible display device and the hinge housing due to a rotation of the plurality of arms 321 and 322. The support portion 350 can move in one direction of the flexible display device due to the rotation of the plurality of arms as the electronic device rotates from the folded to the unfolded state. As a result, the support portion 350 can be positioned on a rear face of the flexible display device to support a region of the device. The support portion 350 can be in contact with at least one region of the rear face of the flexible display device to support it. The 350 support portion can be separated at a minimum distance from the flexible display device to support a region of the flexible display device. A support plate can be attached to at least one region of the flexible display device by means of an adhesive element (e.g., adhesive). The support portion 350 can support at least one region of the back face of the support plate. While the electronic device rotates from the deployed state to the folded state, the support portion 350 can be separated from the flexible display device and therefore not affect the drive path of the flexible display device. The support portion 350 can be arranged between the first and second hinge structures 300a and 300b, and can provide a connection between them. One end of the support portion 350 can be arranged on the first hinge structure 300a, the other end of the support portion 350 can be arranged on the second hinge structure 300b, and the central portion of the support portion 350 can be located between the first and second hinge structures 300a and 300b. The support portion 350 can be arranged between the flexible display device and at least one or more FPCB 226 and 227. The ends of the support portion 350 can be arranged between the flexible display device and each of the first and second hinge structures 300a and 300b, and the central portion can be arranged between the flexible display device and at least one or more FPCB 226 and 227. For example, the flexible display device and the FPCB can be spatially separated from each other due to the central portion of the support portion 350. FPCBs 226 and 227 may include the main FPCB 226 and the auxiliary FPCB 227. The main FPCB 226 and the auxiliary FPCB 227 may be arranged between the central portion 3501 of the support portion and the hinge housing. The folding region of the flexible display device, the central portion of the support portion, and FPCBs 226 and 227 may be arranged in a mutually stacked structure. FPCBs 226 and 227 may electrically couple at least one electronic component arranged in the first housing and at least one second electronic component arranged in the second housing. The first electronic component may be a main PCB, and the second electronic component may be a first battery. During the opening / closing operation of the electronic device, the support portion 350 can move downwards towards FPCB 226 and 227, and the downward movement of the support portion 350 can restrict the movement of FPCB 226 and 227. The support portion 250 can prevent FPCB 226 and 227 from separating due to uneven wrinkling. In the opening / closing operation of the electronic device, the central portion of the support portion 350 facing the FPCB 226 and 227 may have curved (e.g., rounded) edge portions on both sides of a second face, thus preventing the FPCB 226 and 227 from being stamped due to interference between the edge portion and the FPCB. Figure 9 illustrates a state in which a hinge structure and a hinge housing are separated according to one embodiment. Figure 10A illustrates a cross-sectional view, cut along line AA in Figure 9, of a hinge structure when an electronic device is in an unfolded state according to one embodiment. Figure 10B illustrates a hinge structure when an electronic device rotates from an unfolded state to a folded state according to one embodiment. Figure 10C illustrates a cross-sectional view, cut along line AA in Figure 9, of a hinge structure when an electronic device is in a folded state according to one embodiment. With reference to Figures 9 to 10C, an electronic device includes hinge structure 300a. Hinge structure 300a includes a first support 311, a second support 312, a fixing support 313, a first arm 321, a second arm 322, a first fixing portion 323, a second fixing portion 324, a support portion 350, a first shaft 331 to which a first gear 331a and a first spring 342 are coupled, a second shaft 332 to which a second gear 332a and a second spring 343 are coupled, a first idle gear 333, a second idle gear 334, a shaft support 335, a first auxiliary element 363, and a second auxiliary element 364.At least one of the components of the aforementioned hinge structure 300a may be identical or similar to at least one of the components of hinge structure 300a or 300b of Figure 4B, hinge structure 300a or 300b of Figure 6, and / or hinge structure 300a or 300b of Figure 7B, and redundant descriptions will be omitted from this point forward. The first bracket 311 and the second bracket 312 can be mounted in a first slot 313a and a second slot 313b formed in the mounting bracket 313 to be supported by the mounting bracket 313. The first bracket 311 can include a first rail portion 311a shaped to correspond to the first slot 313a, and the second bracket 312 can include a second rail portion 312a shaped to correspond to the second slot 313b. The first bracket 311 can be rotated by sliding into the first slot 313a through the first rail portion 311a, and the second bracket 312 can be rotated by sliding into the second slot 313b through the second rail portion 312a. The first support 311 may be coupled to at least one region of a first housing to rotate in association with the first housing. The second support 312 may be coupled to at least one region of a second housing to rotate in association with the second housing. Through the aforementioned structure, the first support 311 may rotate within a specified range about a first virtual rotation axis L1, and the second support 312 may rotate within a specified range about a second virtual rotation axis L2 adjacent to the first rotation axis L1.The first support 311 can rotate within an angle range from 0° up to an angle (e.g., 90°) at which the electronic device is in the folded state with respect to the +x axis, and the second support 312 can rotate within an angle range from 180° up to an angle at which the electronic device is in the folded state with respect to the +x axis. When the electronic device is unfolded, the first support 311 and the second support 312 can be arranged horizontally to each other, and when the electronic device is in the folded state, the first support 311 and the second support 312 can be arranged facing each other. The first arm 321 can be coupled to a region of the first shaft 331 to rotate together with the first shaft 331. The second arm 322 can be coupled to a region of the second shaft 332 adjacent to the first shaft 331 to rotate together with the second shaft 332. The first arm 321 can rotate about an L3 axis of rotation (hereafter, a "third axis of rotation") of the first shaft 331 due to the aforementioned coupling structure. Furthermore, the second arm 322 can rotate about an L4 axis of rotation (hereafter, a "fourth axis of rotation") of the second shaft 331. When the electronic device is in the deployed state, the first arm 321 and the second arm 322 can be arranged horizontally relative to each other, and when the electronic device is in the folded state, the first arm 321 and the second arm 322 can be arranged opposite each other. The first arm 321 and the second arm 322 can rotate at the same angle through the first gear 331a of the first shaft 331, the second gear 332a of the second shaft 332, the first idle gear 333, and the second idle gear 334. When the first shaft 331 rotates a specific angle, the first gear 331a can also rotate the same angle. The rotation of the first gear 331a can be transferred to the first idle gear 333 meshed with the first gear 331a, and the rotation transferred to the first idle gear 333 can be transferred to the second gear 332a via the second idle gear 334 meshed with the first idle gear 333. The second shaft 332 can also rotate a specific angle due to the rotation transferred to the second gear 332a. Through the aforementioned procedure, the first arm 321 meshed with the first shaft 331 and the second arm 322 meshed with the second arm 332 can rotate the same angle. The first rotation axis L1 and the second rotation axis L2 can be positioned between the third rotation axis L3 and the fourth rotation axis L4. Furthermore, since the first rotation axis L1 and the second rotation axis L2 are positioned in a region at the upper end of the third rotation axis L3 and the fourth rotation axis L4, they can be incorporated into a flexible display device. Specifically, the first support 311, the second support 312, the first arm 321, and the second arm 322 can rotate within a specified angle range around different rotation axes. According to one embodiment, the first support 311 can be coupled to a region of the first arm 321 via the first fixing portion 323, and the second support 312 can be coupled to a region of the second arm 322 via the second fixing portion 324. A first sliding hole 311b can be formed in a region adjacent to the first arm 321 of the first support 311, and the first fastening portion 323 can pass through the first sliding hole 311b to couple the first support 311 and the first arm 321. A second sliding hole 312b can be formed in a region adjacent to the second arm 322 of the second support 312, and the second fastening portion 324 can pass through the second sliding hole 312b to couple the second support 312 and the second arm 322. When the first bracket 311 rotates together with the first housing, the first fixing portion 323 can slide into the first sliding hole 311b. Due to the sliding of the first fixing portion 323, the first arm 321, coupled with the first bracket 311 via the first fixing portion 323, can also slide together. Similarly, due to the rotation of the second housing, the second fixing portion 324 can slide into the second sliding hole 312b. Due to the sliding of the second fixing portion 324, the second arm 322, coupled with the second bracket 312 via the second fixing portion 324, can also slide together. When the electronic device in which the first support 311, the second support 312, the first arm 321, and the second arm 322 are arranged in the same plane is in the deployed state, the first fixing portion 323 can be arranged outside the first sliding hole 311b, and the second fixing portion 324 can be arranged outside the second sliding hole 312b. As illustrated in Figure 10B, while the electronic device rotates from the unfolded to the folded state, the first and second housings can be rotated a first angle (e.g., 30° from the +x axis to the -x axis) by user manipulation or an external force. When the first and second housings rotate, the first support 311 and second support 312 coupled to the first and second housings can also be rotated a first angle. While the first support 311 rotates counterclockwise, the first fixing portion 323 can slide a specific distance inward from the outside of the first sliding hole 311b. The first arm 321 can rotate counterclockwise a second angle greater than the first angle due to the sliding of the first fixing portion 323. The second arm 322 can rotate a second angle clockwise due to the sliding of the second fixing portion 324. When the electronic device is in the folded state, the first and second supports 311 and 312 and the first and second arms 321 and 322 can be arranged facing each other on one face. The first support 311, the second support 312, the first arm 321, and the second arm 322 can be arranged to be substantially vertical to the +xo axis at an angle (e.g., 80° to 100°) at which the electronic device is in the folded state. When the electronic device is in the folded state, the first fixing portion 323 can be located within the first sliding hole 311b, and the second fixing portion 324 can also be located within the second sliding hole 312b. That is, the first fixing portion 323 can slide inward from the outside of the first sliding hole 311b while the electronic device rotates from the unfolded to the folded state, and can slide outward from the inside of the first sliding hole 311b while the electronic device rotates from the folded to the unfolded state. The second fixing portion 324 can slide in the same manner as the first fixing portion 323. In one example, while the first bracket 311 and the second bracket 312 rotate about the first virtual rotation axis L1 and the second rotation axis L2 due to user manipulation or an external force, the first fixing portion 323 and the second fixing portion 324 can slide respectively into the first sliding hole 311b and the second sliding hole 312b.Due to the sliding of the first fixing portion 323 and the second fixing portion 324, the first arm 321 and the second arm 322 can rotate about the third rotation axis L3 and the fourth rotation axis L4. As a result, the first arm 321 can rotate about a different rotation axis (e.g., L3) than the first support 311 due to the rotation of the first support 311. The second arm 322 can rotate about a different rotation axis (e.g., L4) than the second support 312 due to the rotation of the second support 312. When the electronic device is in a 180-degree deployed state, the support portion 350 can be in contact with an auxiliary element. When the electronic device rotates from the 180-degree deployed state to a folded state, auxiliary elements 363 and 364 can perform a rotation operation, and the state in which the support portion 350 is in contact with auxiliary elements 363 and 364 can be released (operation). Depending on the restoring force of the elastic element 361, the support portion 350 can be moved to a lower end by means of a push operation (operations and ). The support portion 350 can be moved until it comes into contact with a shaft support, and then the movement can be completed by coming into contact with the auxiliary elements 363 and 364 (operation ), i.e., when a closing operation of the electronic device is completed. Figure 11 illustrates a fixing portion and a retaining structure of a hinge structure according to one embodiment. With reference to Figure 11, the hinge structure of an electronic device includes the first support, the second support, a fixing support, the first arm, the second arm, the first fixing portion, the second fixing portion, a first shaft 331 to which a first gear 331a is coupled, a second shaft 332 to which a second gear 332a is coupled, a first idle gear, a second idle gear, the retaining structure 340, a support portion, a first auxiliary element 363, and a second auxiliary element 364. At least one of the components of the hinge structure in Figure 11 may be identical or similar to at least one of the components of the structures in Figure 8, and redundant descriptions will be omitted hereafter. The first support 311 and the first arm 321 can be coupled via the first fastening portion 323 that passes through a region of the first support 311 and the first arm 321. The second support 312 and the second arm 322 can be coupled via the second fastening portion 324 that passes through a region of the second support 312 and the second arm 322. The first fastening portion 323 and the second fastening portion 324 can be designed in the form of a pin extending in a longitudinal direction. The hinge structure further includes a first elastic body and a second elastic body. In one embodiment, the first elastic body and the second elastic body can be a spring or a disc spring, but are not limited to them. The first elastic body may be disposed on an outer circumferential surface of the first fixing portion and may be in a compressed state between the first arm 321 and a first washer ring. Some regions of the first elastic body 323a may pass through some regions of the first arm 321 and may be disposed between the first arm 321 and the first washer ring 325. When the first elastic body 323a is in a compressed state between the first arm 321 and the first washer ring 325, a frictional force may be generated between the first arm 321 and the first support 311. A torque may be generated in a direction opposite to a rotational direction of the first arm 321 due to the frictional force generated between the first arm 321 and the first support 311, and a movement of the first arm 321 may be fixed due to the generated torque.That is, the hinge structure can fix the movement of the first arm 321 in the form of a free stop while the electronic device rotates from the folded state to the unfolded state or rotates from the unfolded state to the folded state without a separate additional component by using the first elastic body 323a. The second elastic body 324a may be arranged on an outer circumferential surface of the second fixing portion 324, and may be arranged in a compressed state between the second arm 322 and a second washer ring. Some regions of the second elastic body 324a may pass through some regions of the second arm 322, and may be arranged between the second arm 322 and the second washer ring 326. When the second elastic body 324a is arranged in a compressed state between the second arm 322 and the second washer ring 326, a frictional force may be generated between the second arm 322 and the second support 312. A torque may be generated in a direction opposite to the direction of rotation of the second arm 322 due to the frictional force generated between the second arm 322 and the second support 312, and the movement of the second arm 322 may be fixed due to the generated torque.That is, the hinge structure 300a according to one embodiment can fix a movement of the second arm 322 while the electronic device rotates from the folded state to the unfolded state or rotates from the unfolded state to the folded state without a separate additional component by using the second elastic body 324a. The hinge structure 340 retention structure includes the retention plate 341, a first spring 342, and a second spring 343. A shaft insertion hole may be formed in at least one region of the retaining plate 341, such that the first shaft 331 and the second shaft 332 engage with the retaining plate 341. The diameter of the shaft insertion hole may be formed to be larger than the diameter of the second shaft 332, so that the first shaft 331 and the second shaft 332 can rotate freely in a state where they are engaged with the retaining plate 341. The retaining plate 341 includes a first retaining portion 341a designed to project along a longitudinal direction of the first shaft 331 and a second retaining portion 341b designed to project along a longitudinal direction of the second shaft 332.The first retaining portion 341a can be arranged to engage with a first cam portion 321a of the first arm 321, and the second retaining portion 341b can be arranged to engage with a second cam portion 322a of the second arm 322, so that the first arm 321 and the second arm 322 can provide cam operation to the first arm 321 and the second arm 322. The first spring 342 can be coupled to the first shaft 331 so that it is located between the retaining plate 341 and a shaft support 335 that supports the first shaft 331. The second spring 343 can be coupled to the second shaft 332 adjacent to the first shaft 331, so that it is located between the retaining plate 341 and the shaft support 335 that supports the second shaft 332. The first spring 342 and the second spring 343 can be arranged in a compressed state in the shaft support 335 and the retaining plate 341, and pressure can be applied to the shaft support 335 in a direction opposite to the retaining plate 341 due to the spring-return force of the first spring 342 and the second spring 343. Due to the spring-return force of the first spring 342 and the second spring 343, the first retaining portion 341a and the second retaining portion 341b of the retaining plate 341 can maintain a state of being engaged with the first cam portion 321a of the first arm 321 and the second cam portion 322a of the second arm 322. With rotation of the first arm 321 and the second arm 322, the retaining plate 341 can be temporarily separated in one direction from the shaft support 335. The first spring 342 and the second spring 343 can be compressed because the retaining plate 341 is separated.Due to the elastic recovery force of the first compressed spring 342 and the second compressed spring 343, the retaining plate 341 can move back in one direction of the first arm 321 and the second arm 322. Even if the retaining plate 341 is temporarily separated from the first arm 321 and the second arm 322, the retaining plate 341 can be brought back into contact with the first arm 321 and the second arm 322 by means of the first spring 342 and the second spring 343. The retaining structure 340 can maintain a coupling state between the first retaining portion 341a and the first cam portion 321a and between the second retaining portion 341b and the second cam portion 322a through the aforementioned structure. Figures 12A and 12B illustrate a coupling relationship between an arm structure and a retaining structure of a hinge structure according to one embodiment. Specifically, Figure 12A illustrates a detached state, and Figure 12B illustrates an assembled state. With reference to Figures 12A and 12B, a hinge structure of an electronic device includes the first arm 321, the second arm 322, and the retaining plate 341. The first arm 321 includes a first cam portion 321a and a first support rib 321b, and the second arm 322 includes a second cam portion 322a and a second support rib 322b. The first support rib 321b of the first arm 321 and the second support rib 322b of the second arm 322 may allow a support portion to move in a superior direction. The first cam portion 321a of the first arm 321 and the second cam portion 322a of the second arm 322 can be formed in a concave-convex structure in which a peak A and a valley B appear repeatedly. The first arm 321 and the second arm 322 can be coupled with the retaining plate 341, and can therefore be arranged such that the first cam portion 321a is coupled with a first retaining portion 341a, and the second cam portion 322a is coupled with a second retaining portion 341b. The retaining plate 341 includes the first retaining portion 341a designed to project in one direction from the first cam portion 321a of the first arm 321 and the second retaining portion 341b designed to project in one direction from the second cam portion 322a of the second arm 322. The first retaining portion 341a and the second retaining portion 341b may be formed in a concave-convex structure in which a peak and a valley appear repeatedly. The peak and valley of the first retaining portion 341a may be designed in a shape corresponding to the peak and valley of the first cam portion 321a, and the peak and valley of the second retaining portion 341b may be designed in a shape corresponding to the peak and valley of the second cam portion 322a.The peak "a" of the first retaining portion 341a and the valley B of the first cam portion 321a can be arranged to correspond with each other, and the valley "b" of the first retaining portion 341a and the peak A of the first cam portion 321a can be arranged to correspond with each other, so that the first retaining portion 341a and the first cam portion 321a are coupled with each other. Similarly, the peak of the second retaining portion 341b and the valley of the second cam portion 322a can be arranged to correspond with each other, and the valley of the second retaining portion 341b and the peak of the second cam portion 322a can be arranged to correspond with each other, so that the second retaining portion 341b and the second cam portion 322a are coupled with each other. When the retaining plate 341 is arranged such that the first cam portion 321a and the first retaining portion 341a are engaged, and the second cam portion 322a and the second retaining portion 341b are engaged, the retaining plate 341 can provide cam operation to the first arm 321 and the second arm 322. A step between peak (or valley) and peak (or valley) of the first retaining portion 341a can be designed to be longer than a step between peak (or valley) and peak (or valley) of the first cam portion 321a, so that the first cam portion 321a rotates within a specified angle range even when engaged with the first retaining portion 341a.The pitch between peak (or valley) and peak (or valley) of the first retaining portion 341a may be designed to be equal to the pitch between peak (or valley) and peak (or valley) of the first cam portion 321a, or it may be designed to be shorter than the pitch between peak (or valley) and peak (or valley) of the first cam portion 321a. While the electronic device rotates from a folded to an unfolded state or from an unfolded to a folded state, the peak of the first cam portion 321a of the first arm 321 may engage with the peak of the first retaining portion 341a so that the first arm 321 and the retaining plate 341 are temporarily separated. While the peak of the first cam portion 321a is beyond the peak of the first retaining portion 341a, the first retaining portion 341a may provide cam operation to the first arm 321.The second retaining portion 341b can also provide cam operation to the second arm 322 in the same or similar manner to the first retaining portion 341a. The first retaining portion 341a and the second retaining portion 341b can provide cam operation to the first arm 321 and the second arm 322 and also fix a movement of the first arm 321 and the second arm 322. A flat linear region may be formed in at least one region (for example, a peak region) of the peak of the first cam portion 321a, the peak of the second cam portion 322a, the peak of the first holding portion 341a, and / or the peak of the second holding portion 341b. A flat linear region may also be formed in at least one region of the valley of the first cam portion 321a, the valley of the second cam portion 322a, the valley of the first holding portion 341a, and / or the valley of the second holding portion 341b. The linear region formed in a peak region and the linear region formed in a valley region may be designed to be substantially identical or similar.When the linear region is formed at the peaks and valleys of the first cam portion 321, the second cam portion 322a, the first retaining portion 341a, and the second retaining portion 341b, the movement of the first arm 321 and / or the second arm 322 can be fixed at a specified rotation angle (e.g., 30° or 60°). When the movement of the first arm 321 and / or the second arm 322 is fixed at the specified rotation angle, a movement of a first housing and a second housing of the electronic device can be fixed at the specified rotation angle. Figure 13 illustrates a hinge structure according to one embodiment. With reference to Figure 13, the hinge structure 300a of an electronic device includes a first support 311, a second support 312, a first arm 321, a second arm 322, a first fixing portion 323, a second fixing portion 324, a first shaft 331 to which a first gear 331a is coupled, a second shaft 332 to which a second gear 332a is coupled, a first idle gear 333, a second idle gear 334, a shaft support 335, a first spring 342, a second spring 343, a stop 360, a first auxiliary element 363, and a second auxiliary element 364. At least one of the components of the hinge structure 300a of Figure 13 may be identical or similar to at least one of the components of the hinge structure 300a or 300b of Figure 6, and the Redundant descriptions will be omitted from now on. The first arm 321 includes a first support rib 321b, and the second arm 322 includes a second support rib 322b. The first support rib 321b may be designed to project from a region of the first arm 321. Similarly, the second support rib 322b may be designed to project from a region of the second arm 322. When the electronic device is in a deployed state, the first support rib 321b may be designed to project in a direction from the 360° stop located between the first arm 321 and the second arm 322, extending from the first arm 321. Likewise, the second support rib 322b may be designed to project in a direction from the 360° stop, extending from the second arm 322. The first support rib 321b may be integrally formed with the first arm 321 and may rotate together with a rotation of the first arm 321. The second support rib 322b may be integrally formed with the second arm 322 and may rotate together with a rotation of the second arm 322. As the first support rib 321b and the second support rib 322b rotate together with the first arm 321 and the second arm 322, a support portion disposed at the 360 ​​stop may move in a top direction (e.g., the +y direction). While the electronic device rotates from the folded state to the unfolded state, at least a region of the first support rib 321b and the second support rib 322b may be in contact with a region of the support portion (e.g., a back face of the support portion). When the first arm 321 rotates clockwise (e.g., in the direction ), the first support rib 312b can move the support portion 350 in an upward direction. When the second arm 322 rotates counterclockwise (e.g., in the direction ), the second support rib 322b can move the support portion 350 in an upward direction. The first auxiliary element 363 can be coupled to one end of the first shaft 331 adjacent to the first arm 321, and the second auxiliary element 364 can be coupled to one end of the second shaft 332 of the second arm 322. The first auxiliary element 363 can be coupled to the first shaft 331 to rotate together with the first shaft 331. The second auxiliary element 364 can be coupled to the second shaft 332 to rotate together with the second shaft 332. The first auxiliary element 363 includes a third support rib 363a designed to project from a region of the first auxiliary element 363. The second auxiliary element 364 includes a fourth support rib 364a designed to project from a region of the second auxiliary element 364. The third support rib 363a can be arranged parallel to the first support rib 321b of the first arm 321, and the fourth support rib 364a can be arranged parallel to the second support rib 322b of the second arm 322. The third support rib 363a can be separated from the first support rib 321b to rotate through the same angle as the first support rib 321b with the rotation of the first shaft 331. The fourth support rib 364a can be separated from the second support rib 322b to rotate through the same angle as the second support rib 322b with the rotation of the second shaft 331. 332. The third support rib 363a and the fourth support rib 364a can move the support portion 350 in an upward direction while the electronic device rotates from the folded to the unfolded state, similarly to the first support rib 321b and the second support rib 322b. The third support rib 363a and the fourth support rib 364a can be in contact with a region of the support portion 350 while the electronic device rotates from the folded to the unfolded state. When the first shaft 331 rotates clockwise (e.g., in the direction ), the third support rib 363a can move the support portion 350 in an upward direction. When the second shaft 332 rotates counterclockwise (e.g., in the direction ), the fourth support rib 364a can move the support portion 350 in an upward direction. Therefore, the hinge structure 300a can move the support portion 350 in an upward direction as the electronic device rotates from the folded to the unfolded state via the first support rib 321b, the second support rib 322b, the third support rib 363a, and the fourth support rib 364a. Consequently, the support portion 350 can be in contact with a rear face of a flexible display device, thus preventing the flexible display device from warping and / or being damaged when the electronic device is in the unfolded state. Figure 14A illustrates a compressed state of an elastic element and the first and second arms of a hinge structure when an electronic device is in an extended state according to one embodiment. Figure 14B illustrates an extended state of an elastic element and the first and second arms of a hinge structure when an electronic device is in a folded state according to one embodiment. With reference to Figures 14A and 14B, an electronic device includes a flexible display device 220, a first support plate 221 supporting the flexible display device 220, a second support plate 222, and the hinge structure 300a. The hinge assembly 300a includes a first support 311, a second support 312, a first arm 321, a second arm 322, a support portion 350, a stop 360, an elastic element 361, and a screw 362. The support portion 350 can move in one direction on a rear face of the flexible display device 220 using a first support rib 321b of the first arm 321 and a second support rib 322b of the second arm 322, when the electronic device rotates from the folded to the unfolded state. Through the aforementioned process, the support portion 350 can support a region of the flexible display device 220 that is not supported by the first arm 321 and the second arm 322, when the electronic device is in the unfolded state. When the electronic device is in the deployed state, a gap "g" may form between the support portion 350 and the first support rib 321b of the first arm 321 and the second support rib 322b of the second arm 322. When the electronic device is in the deployed state, as the gap forms between the support portion 350 and the first support rib 321b and the second support rib 322b, the support portion 350 may be prevented from moving in a direction of the flexible display device 220 by at least a specified distance.When the electronic device is in the deployed state, the gap between the support portion 350 and the first and second support ribs 32b and 322b can be made larger than the gap between a protrusion region E1 of a tree support 355 or a protrusion region E2 of the stop 360 and a fixing rib formed in a region of the support portion 350. As a result, the support portion 350 can be prevented from being displaced in a duplicated upward direction by the first and second support ribs 321b and 322b. That is, when the electronic device is in the deployed state, the hinge structure 300a can prevent the flexible display device 220 from being damaged by the support portion 350 through the gap formed between the support portion 350 and the first and second support ribs 321b and 322b. The stop 360 may be located at a lower end (e.g., the -y direction) of the support portion 350, and a through-hole 360c may be formed in a region of the stop 360. A spring-support portion 3505 of the support portion 350 may be located at a lower end of the stop 360 passing through the through-hole 360c, and the screw 362 may be engaged with the spring-support portion 3505 of the support portion 350 passing through the through-hole 360c. An outer circumferential surface of a face of the screw 362 facing the elastic support portion 3505 may be formed to be larger than an outer circumferential surface of the elastic support portion 3505, so that the elastic element 361 is disposed between the stop 360 and the screw 362. The elastic element 361 may be a spring, for example, but is not limited to it. One end of the elastic element 361 may be in contact with a region of the stop 360 (for example, an adjacent region of the through-hole 360c), and the other end may be in contact with the screw 362 engaged with the protruding region of the support portion 350. The elastic element 361 may be compressed when the support portion 350 moves in an upward direction (for example, the +y direction), or it may be restored to its original state due to the elastic recovery force. When the electronic device rotates from the folded to the unfolded state, the support portion 350 moves in a direction relative to the flexible display device 220. The screw 362 coupled to the elastic support portion 3505 can also move in an upward direction (e.g., the +y direction) due to the movement of the support portion 350, and the elastic element 361 can be compressed due to the upward movement of the screw 362. When the electronic device rotates from the deployed to the folded state, the first arm 321 can rotate counterclockwise (e.g., in the y-direction), and the second arm 322 can rotate clockwise (e.g., in the y-direction), such that the first support rib 321b and the second support rib 322b are separated from the support portion 350. Because the first support rib 321b and the second support rib 322b are separated from the support portion 350, pressure can be applied to the screw 362 in a downward direction (e.g., in the y-direction) due to the elastic recovery force of the compressed elastic element 361. Due to the pressure applied to the screw 362, the screw 362 and the support portion 350 coupled with the screw 362 can move in a downward direction (e.g., in the y-direction).That is, while the electronic device rotates from the unfolded state to the folded state, the support portion 350 can be separated from the flexible display device 220 due to the elastic recovery force of the elastic element 361 located between the stop 360 and the screw 362. Through the aforementioned drive procedure, the support portion 350 may not interrupt a rotation path (or "drive path") of the flexible display device 220 or of the first support plate 221 and the second support plate 222 as the electronic device rotates from the deployed to the folded state. However, when the electronic device is in the deployed state, the support portion 350 may support a region of the flexible display device 220 that is not supported by the first arm 321 and the second arm 322, thereby preventing the flexible display device 220 from being damaged or warped. Figure 15A illustrates a cross-sectional view, cut along line BB in Figure 10A, of a hinge structure when an electronic device is in a 180-degree unfolded state according to one embodiment. Figure 15B illustrates a cross-section of a hinge assembly when an electronic device is in an unfolded state according to one embodiment. Figure 15C illustrates a cross-sectional view, cut along line BB in Figure 10C, of ​​a hinge structure when an electronic device is in a folded state according to one embodiment. Figure 15D illustrates a cross-section of a hinge structure while an electronic device is folded according to one embodiment. With reference to Figures 15A to 15D, a hinge structure 300b of an electronic device includes a second support 312, a fixing support 313, a second arm 322, a second fixing portion 324 coupling the second support 312 and the second arm 322, a rotation structure 330 including a second shaft 332, a second idle gear 334, and a shaft support 335, a support portion 350, a stop 360, a spring element 361, and a screw 362. At least one of the components of the hinge structure 300b of Figure 15A may be identical or similar to at least one of the components of the hinge structure 300a or 300b of Figure 6, and redundant descriptions will be omitted hereafter. The support portion 350 may be located at the stop 360 and may include a spring support portion 3505 and a fixing rib 3504. The spring support portion 3505 may be designed to project downwards (e.g., in the -y direction) from the support portion 350 and may engage with the screw 362 as described above to compress the spring element 361 as the electronic device rotates from the folded to the unfolded state. The fixing rib 3504 may be designed to project downwards from the spring support portion 3505 in a manner similar to the spring support portion 3505, and in a side view, may be designed as a hook curved in a direction of the shaft support 335. The fixing rib 3504 can be fixed to a region of the tree support 335 to prevent the support portion 350 from moving at least a specified distance in a top direction (e.g., the +y direction) or in a direction of a flexible display device while the electronic device rotates from the folded state to the unfolded state. The tree support 335 includes a mounting region E1. The mounting region E1 may be designed to project in a direction of the stop 360 from a region of the tree support 335. When the electronic device rotates from the folded state, as illustrated in Figure 15C, to the unfolded state, as illustrated in Figure 15A, the support portion 350 may move in an upward direction, and the mounting rib 3504 of the support portion 350 may come into contact with the mounting region E1 of the tree support 335 due to the upward movement of the support portion 350. When the electronic device is in the deployed state, the hook-shaped attachment rib 3504 may be in contact with a lower region of the attachment region E1, such that the attachment rib 3504 of the support portion 350 becomes trapped in the attachment region E1 of the tree support 335. When the support portion 350 is moved upwards by at least a specified distance, upward pressure may be applied to the flexible display device disposed at an upper end of the support portion 350, and some regions of the flexible display device may be damaged due to the pressure applied by the support portion 350.When the electronic device is in the deployed state, the fixing rib 3504 of the support portion 350 may be arranged to be in contact with the fixing region E1 of the tree support 335 without a gap, so that the support portion 350 can be prevented from moving in the upward direction by at least a specified distance. When the electronic device rotates from the deployed to the folded state, the support portion 350 can move in a downward direction (e.g., the -y direction) due to the elastic recoil force of the elastic element 361, as described above. Consequently, the fixing rib 3504 can be separated from the fixing region E1 of the support 335. When the fixing rib 3504 is separated from the fixing region E1 of the support 335, the support portion 350 can move in a downward direction without being affected by the fixing region E1. That is, the hinge structure 300b can control the movement of the support portion 350 so that it moves in an upward direction within a specified range, through the fixing rib 3504 of the support portion 350 and the fixing region E1 of the support 335. Figure 16 illustrates a hinge assembly attached to an electronic device deployed according to one embodiment. With reference to Figure 16, an electronic device includes hinge assembly 300. Hinge assembly 300 includes hinge structures 300a and 300b. The hinge housing 300c includes a recess in which the hinge structures 300a and 300b can be arranged. The hinge structures 300a and 300b can be arranged within the recess of the hinge assembly 300, and the hinge structures 300a and 300b can be supported by the hinge housing 300c. The hinge assembly 300 includes the first hinge structure 300a arranged in a region of the hinge housing 300c and the second hinge structure 300b arranged in another region of the hinge housing 300c. The first hinge structure 300a may be arranged in the left region of the hinge housing 300c, and therefore may be coupled (or "connected") to a region of a first housing and a second housing. The second hinge structure 300b may be arranged in the right region of the hinge housing 300c, and therefore may be coupled (or "connected") to the first housing and the second housing.The first hinge structure 300a and the second hinge structure 300b can rotate within a specified angle range around a first virtual rotation axis (e.g., L1) formed in the hinge housing 300c and a second virtual rotation axis L2 parallel to the first virtual rotation axis L1. A region of the first hinge structure 300a and a region of the second hinge structure 300b can rotate around the first rotation axis L1, and another region of the first hinge structure 300a and another region of the second hinge structure 300b can rotate around the second virtual rotation axis L2. That is, the first hinge structure 300a and the second hinge structure 300b can fold around the first virtual rotation axis L1 and the second virtual rotation axis L2, the details of which will be described later.However, the hinge assembly 300 is not limited to the embodiment mentioned above, and the hinge assembly 300 may include three or more hinge structures. The hinge assembly 300 further includes first and second hinge plates 300d and 300e arranged between the first hinge structure 300a and the second hinge structure 300b. The first and second hinge plates 300d and 300e are respectively attached to the first and second housings 211 and 212, and may support at least some regions of a flexible display device. The first and second hinge plates 300d and 300e may be made of a metallic or non-metallic material having a specified stiffness to support the flexible display device. The first and second hinge structures 300a and 300b can be arranged on either side, for example, left and right sides, with respect to the support portion 350. The first and second hinge plates 300e and 300d can be arranged on the top and bottom sides with respect to the support portion 350. The first and second arms 321 and 322 and the first and second supports 311 and 312 can be arranged respectively on the top and bottom sides with respect to both ends of the support portion 350. When the electronic device is unfolded 180 degrees, the moving elements, for example, a cam or a hinge spring, of the first and second hinge structures 300a and 300b, can be covered respectively by the first and second protrusion portions 3001d and 3001e of the first and second hinge plates. The support portion 350 is assembled with a cap `c`, such that the first face 350a of the support portion and a top face of the cap `c` are in a coplanar state. In this state, the first face 350a of the support portion can support a folding region of the flexible display device to make it flat. Figure 17A illustrates an assembled state of a support portion according to one embodiment. Figure 17B illustrates a perspective view of the support portion of Figure 17A, cut along line CC. Figure 17C illustrates a cross-sectional view of the support portion of Figure 17A, cut along line C-C. With reference to Figures 17A through 17C, a central portion 3501 of a support portion 350 may be a portion where operational interference can occur due to the movement of an FPCB 226 to electrically couple first and second electronic components arranged in the first and second housings, respectively. During an opening / closing operation of the electronic device, a portion of the FPCB 226 may fold or unfold into a space between a hinge housing 300c and the central portion 3501. The FPCB 226 may move in this space during the folding and unfolding operation, and the FPCB 226 may interfere with adjacent portions, such as an edge portion of the first and second hinge plates 300d and 300e, depending on the movement. When the width `w` of the center portion 3501 is increased to safely support a flexible display device, there is a risk that portion p1 of the FPCB may become stamped (e.g., disconnected). To prevent this, the width `w` of the center portion 3501 may be limited, and the width `w` may be determined by considering the path of movement of the FPCB 226 that is to be folded, in a folding or unfolding operation of the electronic device. For example, the width `w` of the center portion 3501 may be approximately 2 mm. One element that can limit the width `w of the central portion is a distance between the first and second axes of rotation located on both sides, and the width `w can be less than a distance between the first and second axes of rotation. The central portion 3501 may have a limited thickness 't'. The thickness 't' of the central portion 3501 can be determined by considering a motion path of the FPCB that folds or bends during a folding or unfolding operation of the electronic device. For example, the thickness 't' of the central portion 3501 may be approximately 1 mm. The edge portions (e.g., corner portions) of the center portion 3501 may be curved. When folding or unfolding the electronic device, operational interference occurs between both edge portions 3501c and the FPCB 226; therefore, the FPCB may become stamped or disconnected. To prevent this, the edge portions 3501c on one underside of the center portion 3501 may be curved. For example, each of the edge portions 3501c may have a curve. Figure 18 illustrates a cross-sectional view of the support portion of Figure 17A, cut along line DD. With reference to Figure 18, a central portion 3501 and a hinge housing 300c oriented towards the first and second hinge plates 300d and 300e can be formed considering a motion path of the central portion 3501 and the edge portions 3000d and 3000e of the first and second hinge plates 300d and 300e adjacent to the central portion 3501. The hinge housing 300c includes a first opening 3000c considering a motion path of the central portion 3501 and a second opening 3001c considering a motion path of the edge portions 3000d and 3000e of the hinge plate. When the electronic device moves from a folded to an unfolded state, or vice versa, the central portion 3501 can move in a limited way in a direction toward or away from the hinge housing 300c, and the edge portions 3000d and 3000e of the first and second hinge plates can rotate. The first and second openings 3000c and 3001c of the hinge housing can be formed by considering the movement space of the central portion 3501 and the rotational movement space of an edge portion of an FPCB plate. For example, the first opening 3000c is recessed and extends along the direction in which the hinge housing 300c extends. The second opening 3001c is also recessed and is designed to have a shallower depth than the recess depth of the first opening 3000c.A stepped portion 3002c may be formed between the first and second openings 3000c and 3001c. The first opening 3000c may have the second opening 3001c on either side, and the second opening 3001c may be formed symmetrically. From the perspective of the presence or absence of the central portion 3501, since the distance between the edge portions 3000d and 3000e of the first and second hinge plates increases due to the central portion 3501, the path traced by the edge portions 3000d and 3000e can decrease depending on the opening / closing operation of the electronic device. Therefore, the depth of the opening 3001c formed in the hinge housing 300c decreases, and the support structure of the support portion 350, capable of supporting the flexible display device, is extended to the maximum possible extent. Consequently, a support section is also movable inwards, thus ensuring the rigidity of the hinge housing 300c and extending the support section. Figures 19A to 19C illustrate an opening / closing procedure for an electronic device according to one embodiment. Specifically, Figure 19A illustrates a 180-degree unfolded state, Figure 19B illustrates an approximately 90-degree open state, and Figure 19C illustrates a folded state. With reference to Figure 19A, when the electronic device is in an unfolded state, a central portion 3501 can be located outside a first opening 3000c, and the edge portions 3000d and 3000e of the first and second hinge plates 300d and 300e can be located inside the second opening 3001c. The first and second hinge plates 300d and 300e are supported in the hinge housing 300c. When the electronic device is unfolded to 180 degrees, each of the first and second plates 300d and 300e is in a parallel state, and the hinge housing 300c is a support structure for the first and second plates 300d and 300e in the parallel state. With reference to Figure 19B, when the electronic device is in an extended state of approximately 90 degrees, the center portion 3501 can be located in the first opening 3000c, and the edge portions 3000d and 3000e of the first and second hinge plates can be slightly separated from the second opening 3001c. The edge portions 3000d and 3000e of the respective first and second hinge plates can rotate along the second opening 3001c. With reference to Figure 19C, when the electronic device is in a folded state, the center portion 3501 can be located in the first opening 3000c, and the edge portions 3000d and 3000e of the first and second hinge plates can be completely separated from the second opening 3001c. The first and second hinge plates 300d and 300e are free from interference from the hinge housing 300c.Figure 20A illustrates an assembled state of the first and second hinge plates in an electronic device unfolded 180 degrees according to one embodiment. Figure 20B illustrates an enlarged view of a protrusion portion mounted in a support slot of Figure 20A. Figure 20C illustrates a cross-sectional view of a state of Figure 20B, cut along line EE. Figures 20D and 20E illustrate perspective views of states of the first and second hinge plates in an electronic device folded according to one embodiment. With reference to Figures 20A to 20E, a hinge assembly 300 includes first and second hinge plates 300d and 300e. The first and second hinge plates 300d and 300e can serve as a cover for certain components, such as a hinge spring and a hinge cam, of the hinge structure to prevent interference with cam operation and to support the flexible display device in either a closed or open state. The first and second hinge plates 300d and 300e can be attached to the first and second housings, respectively, by means of a fastener, and the first and second hinge plates 300d and 300e can support certain regions of a flexible display device. The first and second hinge plates 300d and 300e can be made of a metallic or non-metallic material having a specified rigidity to support the flexible display device. The first and second hinge plates 300d and 300e include the first and second protrusion portions 3001d and 3001e respectively. The first and second protrusion portions 3001d and 3001e can be supported by a portion of a support portion 350 when the flexible display device is deployed 180 degrees, and can be mounted on a portion of the first and second arms 321 and 322 when the flexible display device is folded. The first and second protrusion portions 3001d and 3001e can be designed as a pair symmetrically with respect to the first hinge plate 300d, and can be designed as a pair symmetrically with respect to the second hinge plate 300e. Each of the first and second protrusion portions 3001d and 3001e can project into the support portion 350. When the electronic device is in a 180-degree open state, the support portion 350 may have at least one formed support slot 3503 for mounting the first and second protrusion portions 3001d and 3001e. When the electronic device is in a closed state, the first and second arms 321 and 322 may have at least one or more mounting slots 3210 and 3220 for mounting the first and second protrusion portions 3001d and 3001e, respectively. The mounting slots 3210 and 3220 may be shaped to avoid unnecessary interference in a folded state of the electronic device. The mounting slots 3210 and 3220 may be escape slots for the first and second protrusion portions 3001d and 3001e. The first and second protrusion portions 3001d and 3001e can be supported by the support portion 350 when mounted in the support slot 3503 of the support portion 350 in a 180-degree extended state, and can be mounted by the mounting slots 3210 and 3220 formed in the first and second arms in a folded state. The first and second protrusion portions 3001d and 3001e can overlap with the support portion 350 having the support slot 3503 in the 180-degree extended state, and can overlap respectively with the first and second arms 321 and 322 having the mounting slots 3210 and 3220 in the folded state. The 3503 support slot can serve as support for the first and second protrusion portions 3001d and 3001e.In the 180-degree deployed state of the electronic device, the first and second 300d and 300e hinge plates can be stably supported, and therefore the flexible display device can also be stably supported. Because a support structure of the first and second portions 3001d and 3001e of the protrusion and the support groove 3503 is located above a hinge spring and a hinge cam, operational interference with the flexible display device can be avoided by being covered due to the support structure when the hinge spring is compressed or elongated, which occurs in the opening / closing operation of the electronic device. Figure 20F illustrates operations of a hinge plate when an electronic device rotates from a closed state to an open state according to one embodiment. With reference to Figure 20F, when the electronic device is in an unfolded state of approximately 90 degrees, the 350 support portion can be separated from the auxiliary element. When the electronic device rotates from a 90-degree deployed state to a 180-degree deployed state, auxiliary elements 363 and 364 can perform a rotation operation, and the first and second hinge plates 300d and 300e can perform a rotation operation (operations and ). The support portion 350 can be moved to an upper end by a push operation of auxiliary elements 363 and 364 (operation ). After the first and second hinge plates 300d and 300e are in contact with the support portion 350, the movement can be completed (operation). The first and second protrusion portions 3001d and 3001e can be mounted in the support groove 3503. Figures 21A to 21C illustrate a support state between the first and second protrusion portions and a support portion during an opening / closing process of an electronic device according to one embodiment. Specifically, Figure 21A illustrates a 180-degree unfolded state, Figure 21B illustrates a 90-degree folded state, and Figure 21C illustrates a folded state. With reference to Figure 21A, when an electronic device is in a 180-degree open state, the first and second protrusion portions 3001d and 3001e can be mounted in a support slot 3503 and can maintain a mounted state. For example, the first and second protrusion portions 3001d and 3001e and the support slot 3503 can be designed with substantially corresponding shapes. In the 180-degree open state, when the first and second protrusion portions 3001d and 3001e are mounted in the support slot 3503, an outer surface of each of the first and second protrusion portions 3001d and 3001e can be in a coplanar state with respect to a first face of a support portion 350. With reference to Figure 21B, when the electronic device is in an open state of approximately 45 degrees, the first and second protrusion portions 3001d and 3001e can be arranged to tilt with respect to the support portion 350 by separating from the support slot 3503, and can be moved downward by means of a spring-loaded body in the support slot 3503. The first and second protrusion portions 3001d and 3001e can be separated from the mounting slots 3210 and 3220 of the first and second arms, respectively. With reference to Figure 21C, when the electronic device is in a closed state, the first and second protrusion portions 3001d and 3001e can be arranged vertically with respect to the support slot 3503 and can be mounted in the mounting slots 3210 and 3220. The first and second protrusion portions 3001d and 3001e can be supported by the mounting slots 3210 and 3220. Figure 22A illustrates a lid attached to a clamping portion of a support portion according to one embodiment. Figure 22B is a cross-sectional view cut along line GG of Figure 22A. Figure 22C illustrates a perspective view of a lid according to one embodiment. With reference to Figures 22A to 22C, a cap "c" can be attached to a clamping portion 3502 of a support portion 350. For example, as a clamping hole, the clamping portion 3502 can include a first stepped portion 35021. The cap "c" has a cap shape corresponding to the clamping portion 3502 and includes a second stepped portion c1. When attached to the clamping portion 3502, a first face 350a of the support portion 350 and a top face c2 of the cap "c" can be in a coplanar state. When folding or unfolding the electronic device, since the first face 350a of the support portion 350 and the top face c2 of the cap are in a coplanar state, the folding region of a flexible display device can be supported when it is in a 180-degree unfolded state. For example, the "c" cap can be a support structure for the flexible display device. Figure 23A illustrates a tape attached to a first face of a support portion according to one embodiment. Figure 23B illustrates a cross-sectional view cut along line FF of Figure 20A of a tape attached to a first face of a support portion according to one embodiment. With reference to Figures 23A and 23B, an additional adhesive layer "b", for example, tape, can be affixed to a first face 350a of a support portion 350. The adhesive layer "b" can be made in the same shape as the first surface 350a and can be affixed to the entire first face 350a. At least one opening 3507 formed in the first face 350a of the support portion 350 can be covered by the adhesive layer "b", and the adhesive layer "b" covering the at least one opening 3507 can provide a coplanar state, thereby supporting the flexible display device. The adhesive layer affixed to the first face 350a can form part of a support structure. The adhesive layer "b" can cover a minute gap that can be created when a clamping portion 3502 of the support portion 350 is secured with the cap "c". Although the description has been shown and described particularly with reference to certain embodiments thereof, it shall be understood by those of ordinary experience in the art that various changes may be made in form and details without departing from the scope of the description as defined by the following claims.

Claims

1. An electronic device (101), comprising: a first housing (211) including at least one first electronic component; a second housing (212) including at least one second electronic component; a hinge housing (300c) disposed between the first housing and the second housing; a hinge structure (300a, 300b) configured to rotatably couple the first housing and the second housing; a flexible printed circuit board (226) electrically coupling the first electronic component and the second electronic component via the hinge housing; and a flexible display device (220) disposed from at least a region of the first housing to at least a region of the second housing via the hinge structure,a first hinge plate (300d) coupled to the first housing and movable when the first housing moves; and a second hinge plate (300e) coupled to the second housing and movable when the second housing moves, wherein the hinge structure comprises: a support portion (350) located between the flexible printed circuit board and the flexible display device, wherein, in an unfolded state in which the flexible display device (220) is arranged to lie flat, the support portion (350) is arranged between the first hinge plate (300d) and the second hinge plate (300e), a first support (311) coupled to the first housing and rotatable when the first housing rotates about a first axis (L1) of rotation; and a second support (312) coupled to the second housing and rotatable when the second housing rotates about a second axis (L2) of rotation, wherein,In the deployed state of the electronic device, the support portion, the first hinge plate, and the second hinge plate support at least a region of the flexible display device in a state where the first hinge plate is at least partially supported by a first area of ​​the support portion and the second hinge plate is at least partially supported by a second area of ​​the support portion opposite the first area, and wherein in a folded state of the electronic device, the support portion is separated from the first hinge plate and the second hinge plate.

2. The electronic device of claim 1, wherein in the deployed state of the electronic device,a first distance between a first portion of the first hinge plate (300d) supported by the first area and a second area of ​​the second hinge plate (300e) supported by the second area is less than a second distance between the first axis (L1) of rotation and the second axis (L2) of rotation.

3. The electronic device of claim 1, wherein the support portion comprises: a first side facing the flexible display device (220); and a second side opposite the first side and facing the flexible printed circuit board (226); and wherein in the deployed state of the electronic device, the folding region of the flexible display device is supported flat by the first side of the support portion.

4. The electronic device of claim 1 or 3, wherein the structure (300a,300b) hinge further comprises: a first shaft (331) corresponding to a third axis of rotation when the first support is rotated; a second shaft (332) corresponding to a fourth axis of rotation when the second support is rotated; a first arm (321) rotating about the third axis (L3) of rotation; and a second arm (322) rotating about the fourth axis (L4) of rotation.

5. The electronic device of claim 4, wherein, in the deployed state of the electronic device, a first distance between a first portion of the first hinge plate (300d), supported by the first area, and a second portion of the second hinge plate (300e), supported by the second area, is less than a second distance between the first shaft (331) and the second shaft (332).

6. The electronic device of claim 4,wherein at least one side of the first arm (321) is coupled to at least one region of the first support (311) via a first fastening portion (323), and wherein at least one side of the second arm (322) is coupled to at least one region of the second support (312) via a second fastening portion (324).

7. The electronic device of claim 4 or 6, wherein the first arm (321) comprises a first support rib (321b) and the second arm (322) comprises a second support rib (322b), and wherein, in the deployed state of the electronic device, the support portion is supported by the first support rib and the second support rib.

8. The electronic device of claim 7,wherein the first support rib (321b) and the second support rib (322b) are configured to move the support portion (350) in the direction of the flexible display device (220) when the first housing (211) and the second housing (212) are rotated such that the electronic device is changed from the folded state to the unfolded state.

9. The electronic device of claim 8, wherein the first shaft (331) comprises a first auxiliary element (363) that rotates about the third axis of rotation and comprises a third support rib (363a), and wherein the second shaft (332) comprises a second auxiliary element (364) that rotates about the fourth axis of rotation and comprises a fourth support rib (364a).

10. The electronic device of claim 9,wherein the third support rib (363a) and the fourth support rib (364a) are configured to move the support portion (350) in the direction of the flexible display device (220) when the first housing (211) and the second housing (212) are rotated so that the electronic device is changed from the folded state to the unfolded state.

11. The electronic device of claim 1 or 3, wherein the first hinge plate (300d) comprises a first protrusion portion (3001d) and the second hinge plate (300e) comprises a second protrusion portion (3001e), and wherein, in the unfolded state of the electronic device, the first protrusion portion is mounted on the first area of ​​the support portion and the second protrusion portion is mounted on the second area of ​​the support portion.

12. The electronic device of claim 11, wherein,In the deployed state of the electronic device, a distance between the first protrusion portion and the second protrusion portion is less than a second distance between the first axis (L1) of rotation and the second axis (L2) of rotation.

13. The electronic device of claim 9, wherein the first arm (321) comprises a first mounting slot (3210) and the second arm (322) comprises a second mounting slot (3220), and wherein, in the folded state of the electronic device, the first protrusion portion (3001d) is mounted in the first mounting slot and the second protrusion portion (3001e) is mounted in the second mounting slot.

14. The electronic device of claim 4, wherein the hinge structure further comprises a retaining plate (341) coupled to the first shaft (331) and the second shaft (332), wherein the first arm (321) comprises a first cam portion (321a),wherein the second arm (322) comprises a second cam portion (322a), and wherein the first cam portion of the first arm and the second cam portion of the second arm are fixed to the retaining plate at a specific angle formed by the first housing (211) and the second housing (212).

15. The electronic device of claim 14, wherein the retaining plate (341) comprises a first retaining portion (341a) projecting toward the first cam portion (321a) of the first arm (321), wherein the retaining plate comprises a second retaining portion (341b) projecting toward the second cam portion (322a) of the second arm (322), and wherein, at the specific angle formed by the first housing (211) and the second housing (212),The first cam portion is arranged to engage with the first retaining portion, and the second cam portion is arranged to engage with the second retaining portion.

16. The electronic device of claim 14, wherein the retaining plate (341) comprises a first hole and a second hole, and wherein the first shaft (331) is coupled to the retaining plate through the first hole and the second shaft (332) is coupled to the retaining plate through the second hole.

17. The electronic device of claim 1, wherein the hinge structure (300a, 300b) further comprises a mounting bracket (313) disposed on the hinge housing and supporting the first and second brackets, wherein the mounting bracket comprises a first groove (313a) and a second groove (313b).and wherein the first support (311) is coupled to the first slot and the second support (312) is coupled to the second slot.

18. The electronic device of claim 17, wherein the first support (311) comprises a first rail portion (311a) having a shape corresponding to the first slot (313a), wherein the second support (312) comprises a second rail portion (312a) having a shape corresponding to the second slot (313b), wherein the first support rotates through the first rail portion, and wherein the second support rotates through the second rail portion.

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