Patent Publication Number: US-2023144645-A1

Title: Accessory device and electronic device including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation application of International Application No. PCT/KR2022/012991 designating the United States, filed on Aug. 31, 2022, in the Korean Intellectual Property Receiving Office and claiming priority to Korean Patent Application No. 10-2021-0152914, filed on Nov. 9, 2021, and Korean Patent Application No. 10-2021-0160078, filed on Nov. 19, 2021, in the Korean Intellectual Property Office, the disclosures of which are incorporated by reference herein in their entireties. 
    
    
     BACKGROUND 
     1. Field 
     The disclosure relates to an accessory device and an electronic device including the same. 
     2. Description of Related Art 
     An electronic device has been made slimmer and developed in various ways to strengthen a design element and simultaneously differentiate a functional element. The shape of an electronic device has been made transformable into various shapes, from a standardized rectangular shape. 
     Research has been conducted to implement a transformable structure which is convenient to carry while providing a wide-screen display. For example, by utilizing a flexible display of which a partial region is foldable, there is a foldable device or a rollable device including an expandable screen display area of the flexible display, according to a usage environment. Related to the rollable device, a partial region of the display may be inside a housing of an electronic device, and as the partial region of the display is inserted into or withdrawn from the housing, the screen display area of the display may be respectively retractable or expandable. 
     SUMMARY 
     In an electronic device of which a screen display area of a display expands or retracts, a display and a housing which supports an expanded area of the display, may have an unstable support structure compared to other regions of the electronic device. Additionally, a portion of the electronic device for mechanically affecting the expansion or retraction of the display may be inconvenient to use. 
     In addition, since the electronic device provides high performance and high function in various fields, such as a via battery, a camera and a speaker, but also provides slimness and light weight to improve portability of the electronic device, improved display devices to simultaneously satisfy the high performance and portability are being developed. 
     The technical goals to be achieved through example embodiments of the present disclosure are not limited to those described above, and other technical goals not mentioned above are clearly understood by one of ordinary skill in the art from the following description. 
     According to one embodiment, an accessory device detachably attachable to an electronic device comprising a housing which is expandable to define an expanded area of the housing, and a display module which is expandable, together with the housing, to define an expanded area of the display module, and the accessory device may comprise a main body configured to be mounted to the expanded area of the housing, the main body comprising a mounting surface; and a coupling unit which detachably attaches the accessory device to the electronic device, wherein the main body which is attached to the housing which is expanded, may disposes the mounting surface to support the expanded area of the housing together with the expanded area of the display module. 
     According to another embodiment, an electronic device may comprise a housing comprising a first housing which is moveable relative to a second housing, in an expansion direction away from the second housing to define an expanded area of the first housing and in a retraction direction toward the second housing; a display module connected to the housing, the display module extendable in the expansion direction to define an expanded area of the display module, and retractable in the retraction direction, together with the first housing; and an accessory device detachably attachable to the housing. In one embodiment, the accessory device may comprise a main body configured to be mounted to the expanded area of the housing, the main body comprising a mounting surface which is extended along the expansion direction, and a coupling unit which detachably attaches the main body to the housing. In one embodiment, the main body which is attached to the housing which is expanded, may disposes the mounting surface to support the expanded area of the display module together with the expanded area of the first housing. 
     According to various embodiments, an accessory device and an electronic device including the same may support and protect an extended area of the electronic device in an expanded state and may improve portability of the electronic device. 
     In addition, according to various embodiments, the accessory device may include various types of modules configured to supplement or upgrade a function of the electronic device and thus may realize the high performance of the electronic device and may assist the electronic device to be slimmer and lighter. 
     Moreover, the effects of the electronic device according to various example embodiments are not limited to the effects mentioned above, and other unmentioned effects can be clearly understood from the following description by one of ordinary skill in the art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of certain embodiments of the present disclosure will be more apparent from the following detailed description, taken in conjunction with the accompanying drawings, in which: 
         FIG.  1    is a block diagram of an electronic device in a network environment according to one embodiment; 
         FIG.  2 A  is a front view of an electronic device according to one embodiment; 
         FIG.  2 B  is a rear view of the electronic device according to one embodiment; 
         FIG.  2 C  is a front view of the electronic device according to one embodiment; 
         FIG.  2 D  is a rear view of the electronic device according to one embodiment; 
         FIG.  2 E  is an exploded perspective view of the electronic device according to one embodiment; 
         FIG.  3 A  is a front perspective view of an electronic device according to one embodiment; 
         FIG.  3 B  is a rear perspective view of the electronic device according to one embodiment; 
         FIG.  3 C  is a front view of the electronic device according to one embodiment; 
         FIG.  3 D  is a rear view of the electronic device according to one embodiment; 
         FIG.  4 A  is a perspective view of an electronic device and an accessory device according to one embodiment; 
         FIG.  4 B  is a side view of the electronic device and the accessory device according to one embodiment; 
         FIG.  5 A  is a side view of the electronic device and the accessory device according to one embodiment; 
         FIG.  5 B  is a side view of the electronic device and the accessory device according to one embodiment; 
         FIG.  5 C  is a side view of the electronic device and the accessory device according to one embodiment; 
         FIG.  5 D  is a side view of the electronic device and the accessory device according to one embodiment; 
         FIG.  6    is a side view of an electronic device and an accessory device according to one embodiment; 
         FIG.  7 A  is a side view of an electronic device and an accessory device according to one embodiment; 
         FIG.  7 B  is a side view of the electronic device according to one embodiment; 
         FIG.  7 C  is a side view of the accessory device according to one embodiment; 
         FIG.  8 A  is a diagram illustrating a configuration of an accessory device according to one embodiment; 
         FIG.  8 B  is a diagram illustrating a configuration of the accessory device according to one embodiment; 
         FIG.  8 C  is a diagram illustrating a configuration of the accessory device according to one embodiment; 
         FIG.  9 A  is a front view of an electronic device and an accessory device according to one embodiment; 
         FIG.  9 B  is a front view of the accessory device according to one embodiment; 
         FIG.  9 C  is a front view of the accessory device according to one embodiment; 
         FIG.  10 A  is a front view of an electronic device according to one embodiment; 
         FIG.  10 B  is a front view of the electronic device according to one embodiment; 
         FIG.  10 C  is a front view of the electronic device and an accessory device according to one embodiment; and 
         FIG.  10 D  is a front view of the electronic device and the accessory device according to one embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, example embodiments will be described in detail with reference to the accompanying drawings. When describing the example embodiments with reference to the accompanying drawings, like reference numerals refer to like constituent elements and a repeated description related thereto will be omitted. As used herein, a reference number may indicate a singular element or a plurality of the element. For example, a reference number labeling a singular form of an element within the drawing figures may be used to reference a plurality of the singular element within the text of specification. 
     It should be appreciated that various example embodiments of the present disclosure and the terms used therein are not intended to limit the technical features set forth herein to particular example embodiments and include various changes, equivalents, or replacements for a corresponding example embodiment. In connection with the description of the drawings, like reference numerals may be used for similar or related components. 
     It is to be understood that a singular form of a noun corresponding to an item may include one or more of the things, unless the relevant context clearly indicates otherwise. As used herein, “a”, “an,” “the,” and “at least one” do not denote a limitation of quantity, and are intended to include both the singular and plural, unless the context clearly indicates otherwise. For example, “an element” has the same meaning as “at least one element,” unless the context clearly indicates otherwise. “At least one” is not to be construed as limiting “a” or “an.” “Or” means “and/or.” 
     As used herein, “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 “A, B, or C,” each of which may include any one of the items listed together in the corresponding one of the phrases, or all possible combinations thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof. 
     Terms such as “first”, “second”, or “first” or “second” may simply be used to distinguish the component from other components in question, and do not limit the components in other aspects (e.g., importance or order). 
     It is to be understood that if an element (e.g., a first element) is referred to, with or without the term “operatively” or “communicatively”, as “coupled with,” “coupled to,” “connected with,” or “connected to” another element (e.g., a second element), it means that the element may be coupled with the other element directly (e.g., wired), wirelessly, or via a third element. In contrast, if an element (e.g., a first element) is referred to as being “directly coupled with,” “directly coupled to,” “directly connected with,” or “directly connected to” another element (e.g., a second element), it means that the element may be coupled with the other element without a third (intervening) element therebetween. 
     Furthermore, relative terms, such as “lower” or “bottom” and “upper” or “top,” may be used herein to describe one element&#39;s relationship to another element as illustrated in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. For example, if the device in one of the figures is turned over, elements described as being on the “lower” side of other elements would then be oriented on “upper” sides of the other elements. The term “lower,” can therefore, encompasses both an orientation of “lower” and “upper,” depending on the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as “below” or “beneath” other elements would then be oriented “above” the other elements. The terms “below” or “beneath” can, therefore, encompass both an orientation of above and below. 
     “About” or “approximately” as used herein is inclusive of the stated value and means within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art, considering the measurement in question and the error associated with measurement of the particular quantity (i.e., the limitations of the measurement system). For example, “about” can mean within one or more standard deviations, or within ±30%, 20%, 10% or 5% of the stated value. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     Embodiments are described herein with reference to cross section illustrations that are schematic illustrations of idealized embodiments. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region illustrated or described as flat may, typically, have rough and/or nonlinear features. Moreover, sharp angles that are illustrated may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the present claims. 
     As used in connection with various example embodiments of the disclosure, the term “module” may include a unit implemented in hardware, software, or firmware, and may interchangeably be used with other terms, for example, “logic,” “logic block,” “part,” or “circuitry”. A module may be a single integral component, or a minimum unit or part thereof, adapted to perform one or more functions. For example, according to an example embodiment, the module may be implemented in a form of an application-specific integrated circuit (ASIC). 
     Various example embodiments as set forth herein may be implemented as software (e.g., the program  120 ) including one or more instructions that are stored in a storage medium (e.g., an internal memory  136  or an external memory  138 ) that is readable by a machine (e.g., the electronic device). For example, a processor of the machine (e.g., an electronic device) may invoke at least one of the one or more instructions stored in the storage medium and execute it. This allows the machine to be operated to perform at least one function according to the at least one instruction invoked. The one or more instructions may include a code generated by a compiler or a code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, the term “non-transitory” 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 differentiate between where data is semi-permanently stored in the storage medium and where the data is temporarily stored in the storage medium. 
     According to an example embodiment, a method according to various example embodiments of the disclosure may be included and provided in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or be distributed (e.g., downloaded or uploaded) online via an application store (e.g., PlayStore™), or between two user devices (e.g., smartphones) directly. If distributed online, at least part of the computer program product may be temporarily generated or at least temporarily stored in the machine-readable storage medium, such as memory of the manufacturer&#39;s server, a server of the application store, or a relay server. 
     According to various example embodiments, each component (e.g., a module or a program) of the above-described components may include a single entity or multiple entities, and some of the multiple entities may be separately disposed in different components. According to various example embodiments, one or more of the above-described components 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 example embodiments, the integrated component may still 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 one of the plurality of components before the integration. According to various example embodiments, operations performed by the module, the program, or another component may be carried out 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 other operations may be added. 
       FIG.  1    is a block diagram illustrating an electronic device  101  in a network environment  100  according to various example embodiments. Referring to  FIG.  1   , the electronic device  101  in the network environment  100  may communicate with an electronic device  102  via a first network  198  (e.g., a short-range wireless communication network), or communicate with at least one of an electronic device  104  or a server  108  via a second network  199  (e.g., a long-range wireless communication network). According to an example embodiment, the electronic device  101  may communicate with the electronic device  104  via the server  108 . According to an example embodiment, the electronic device  101  may include a processor  120 , a memory  130 , an input module  150 , a sound output module  155 , a display module  160 , an audio module  170 , a sensor module  176 , an interface  177 , a connecting 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 module (SIM)  196 , or an antenna module  197 . In some example embodiments, at least one (e.g., the connecting terminal  178 ) of the above components may be omitted from the electronic device  101 , or one or more other components may be added in the electronic device  101 . In some example embodiments, some (e.g., the sensor module  176 , the camera module  180 , or the antenna module  197 ) of the components may be integrated as a single component (e.g., the display module  160 ). 
     The processor  120  may execute, for example, software (e.g., a program  140 ) to control at least one other component (e.g., a hardware or software component) of the electronic device  101  connected to the processor  120 , and may perform various data processing or computation. According to one embodiment, as at least a portion of data processing or computation, the processor  120  may store a command or data received from another component (e.g., the sensor module  176  or the communication module  190 ) in a volatile memory  132 , process the command or the data stored in the volatile memory  132 , and store resulting data in a non-volatile memory  134 . According to one embodiment, the processor  120  may include a main processor  121  (e.g., a central processing unit (CPU) or an application processor (AP)), or an auxiliary processor  123  (e.g., a graphics processing unit (GPU), a neural processing unit (NPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)) that is operable independently from, 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 from the main processor  121  or as a part of the main processor  121 . 
     The auxiliary processor  123  may control at least some of functions or states related to at least one (e.g., the display module  160 , the sensor module  176 , or the communication module  190 ) of the components of the electronic device  101 , instead of the main processor  121  while the main processor  121  is in an inactive (e.g., sleep) state or along with the main processor  121  while the main processor  121  is in an active state (e.g., executing an application). According to an example embodiment, the auxiliary processor  123  (e.g., an ISP or a CP) may be implemented as a portion of another component (e.g., the camera module  180  or the communication module  190 ) that is functionally related to the auxiliary processor  123 . According to an example embodiment, the auxiliary processor  123  (e.g., an NPU) may include a hardware structure specified for artificial intelligence (AI) model processing. An AI model may be generated by machine learning. Such learning may be performed by, for example, the electronic device  101  in which an artificial intelligence model is executed, or performed via a separate server (e.g., the server  108 ). Learning algorithms may include, but are not limited to, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning. The artificial intelligence model may include a plurality of artificial neural network layers. An artificial neural network may include, for example, 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), and a bidirectional recurrent deep neural network (BRDNN), a deep Q-network, or a combination of two or more thereof, but is not limited thereto. The artificial intelligence model may additionally or alternatively, include a software structure other than the hardware structure. 
     The memory  130  may store various data used by at least one component (e.g., the processor  120  or the sensor module  176 ) of the electronic device  101 . The various data may include, for example, software (e.g., the program  140 ) and input data or output data for a command related thereto. The memory  130  may include the volatile memory  132  or the non-volatile memory  134 . The non-volatile memory  134  may include an internal memory  136  and an external memory  138 . 
     The program  140  may be stored as software in the memory  130 , and may include, for example, an operating system (OS)  142 , middleware  144 , or an application  146 . 
     The input module  150  may receive a command or data to be used by another component (e.g., the processor  120 ) of the electronic device  101 , from the outside (e.g., a user) of the electronic device  101 . The input module  150  may include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen). 
     The sound output module  155  may output a sound signal to the outside of the electronic device  101 . The sound output module  155  may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as playing multimedia or playing record. The receiver may be used to receive an incoming call. According to an example embodiment, the receiver may be implemented separately from the speaker or as a part of the speaker. 
     The display module  160  may visually provide information to the outside (e.g., a user) of the electronic device  101 . The display module  160  may include, for example, a control circuit for controlling a display, a hologram device, or a projector and control circuitry to control a corresponding one of the display, the hologram device, and the projector. According to an example embodiment, the display device  160  may include a touch sensor adapted to sense a touch, or a pressure sensor adapted to measure an intensity of a force incurred by the touch. 
     The audio module  170  may convert a sound into an electric signal or vice versa. According to an example embodiment, the audio module  170  may obtain the sound via the input device  150  or output the sound via the sound output device  155  or an external electronic device (e.g., an electronic device  102  such as a speaker or a headphone) directly or wirelessly connected to the electronic device  101 . 
     The sensor module  176  may detect an operational state (e.g., power or temperature) of the electronic device  101  or an environmental state (e.g., a state of a user) external to the electronic device  101 , and generate an electric signal or data value corresponding to the detected state. According to an example embodiment, the sensor module  176  may include, for example, a gesture sensor, a gyro 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. 
     The interface  177  may support one or more specified protocols to be used for the electronic device  101  to be coupled with the external electronic device (e.g., the electronic device  102 ) directly (e.g., wiredly) or wirelessly. According to an example embodiment, the interface  177  may include, for example, a high-definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, or an audio interface. 
     The connecting terminal  178  may include a connector via which the electronic device  101  may be physically connected to an external electronic device (e.g., the electronic device  102 ). According to an example embodiment, the connecting terminal  178  may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector). 
     The haptic module  179  may convert an electric signal into a mechanical stimulus (e.g., a vibration or a movement) or an electrical stimulus which may be recognized by a user via his or her tactile sensation or kinesthetic sensation. According to an example embodiment, the haptic module  179  may include, for example, a motor, a piezoelectric element, or an electric stimulator. 
     The camera module  180  may capture a still image and moving images. According to an example embodiment, the camera module  180  may include one or more lenses, image sensors, ISPs, or flashes. 
     The power management module  188  may manage power supplied to the electronic device  101 . According to an example embodiment, the power management module  188  may be implemented as, for example, at least a part of a power management integrated circuit (PMIC). 
     The battery  189  may supply power to at least one component of the electronic device  101 . According to an example embodiment, the battery  189  may include, for example, a primary cell which is not rechargeable, a secondary cell which is rechargeable, or a fuel cell. 
     The communication module  190  may support establishing a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device  101  and the external electronic device (e.g., the electronic device  102 , the electronic device  104 , or the server  108 ) and performing communication via the established communication channel. The communication module  190  may include one or more communication processors that are operable independently of the processor  120  (e.g., an AP) and that support a direct (e.g., wired) communication or a wireless communication. According to an example embodiment, the communication module  190  may include a wireless communication module  192  (e.g., 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  (e.g., 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  104  via the first network  198  (e.g., a short-range communication network, such as Bluetooth™, wireless-fidelity (Wi-Fi) direct, or infrared data association (IrDA)) or the second network  199  (e.g., 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., a LAN or a wide area network (WAN))). These various types of communication modules may be implemented as a single component (e.g., a single chip), or may be implemented as multi components (e.g., multi chips) separate from each other. The wireless communication module  192  may identify and authenticate the electronic device  101  in a communication network, such as the first network  198  or the second network  199 , using subscriber information (e.g., international mobile subscriber identity (IMSI)) stored in the SIM  196 . 
     The wireless communication module  192  may support a 5G network after a 4G network, and a next-generation communication technology, e.g., a new radio (NR) access technology. The NR access technology may support enhanced mobile broadband (eMBB), massive machine type communications (mMTC), or ultra-reliable and low-latency communications (URLLC). The wireless communication module  192  may support a high-frequency band (e.g., a mmWave band) to achieve, e.g., a high data transmission rate. The wireless communication module  192  may support various technologies for securing performance on a high-frequency band, such as, e.g., beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), an array antenna, analog beam-forming, or a large scale antenna. The wireless communication module  192  may support various requirements specified in the electronic device  101 , an external electronic device (e.g., the electronic device  104 ), or a network system (e.g., the second network  199 ). According to an example embodiment, the wireless communication module  192  may support a peak data rate (e.g., 20 Gbps or more) for implementing eMBB, loss coverage (e.g., 164 dB or less) for implementing mMTC, or U-plane latency (e.g., 0.5 ms or less for each of downlink (DL) and uplink (UL), or a round trip of 1 ms or less) for implementing URLLC. 
     The antenna module  197  may transmit or receive a signal or power to or from the outside (e.g., the external electronic device) of the electronic device  101 . According to an example embodiment, the antenna module  197  may include an antenna including a radiating element including a conductive material or a conductive pattern formed in or on a substrate (e.g., a printed circuit board (PCB)). According to an example embodiment, the antenna module  197  may include a plurality of antennas (e.g., array antennas). In such a case, at least one antenna appropriate for a communication scheme used in a communication network, such as the first network  198  or the second network  199 , may be selected by, for example, the communication module  190  from the plurality of antennas. The signal or the power may be transmitted or received between the communication module  190  and the external electronic device via the at least one selected antenna. According to an example embodiment, another component (e.g., a radio frequency integrated circuit (RFIC)) other than the radiating element may be additionally formed as a part of the antenna module  197 . 
     According to various example embodiments, the antenna module  197  may form a mmWave antenna module. According to an example embodiment, the mmWave antenna module may include a PCB, an RFIC disposed on a first surface (e.g., a bottom surface) of the PCB or adjacent to the first surface and capable of supporting a designated a high-frequency band (e.g., the mmWave band), and a plurality of antennas (e.g., array antennas) disposed on a second surface (e.g., a top or a side surface) of the PCB, or adjacent to the second surface and capable of transmitting or receiving signals in the designated high-frequency band. 
     At least some of the above-described components may be coupled mutually and communicate signals (e.g., commands or data) therebetween via an inter-peripheral communication scheme (e.g., a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)). 
     According to an example embodiment, commands or data may be transmitted or received between the electronic device  101  and the external electronic device  104  via the server  108  coupled with the second network  199 . Each of the external electronic devices  102  and  104  may be a device of the same type as or a different type from the electronic device  101 . According to an example embodiment, all or some of operations to be executed by the electronic device  101  may be executed at one or more of the external electronic devices  102 ,  104 , and  108 . For example, if the electronic device  101  needs to perform a function or a service automatically, or in response to a request from a user or another device, the electronic device  101 , instead of, or in addition to, executing the function or the service, may request one or more external electronic devices to perform at least part of the function or the service. The one or more external electronic devices receiving the request may perform the at least part of the function or the service requested, or an additional function or an additional service related to the request, and may transfer an outcome of the performing to the electronic device  101 . The electronic device  101  may provide the outcome, with or without further processing of the outcome, as at least part of a reply to the request. To that end, a cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device  101  may provide ultra low-latency services using, e.g., distributed computing or mobile edge computing. In another example embodiment, the external electronic device  104  may include an Internet-of-things (IoT) device. The server  108  may be an intelligent server using machine learning and/or a neural network. According to an example embodiment, the external electronic device  104  or the server  108  may be included in the second network  199 . The electronic device  101  may be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology or IoT-related technology. 
       FIG.  2 A  is a front view of an electronic device according to one embodiment,  FIG.  2 B  is a rear view of the electronic device according to one embodiment,  FIG.  2 C  is a front view of the electronic device according to one embodiment,  FIG.  2 D  is a rear view of the electronic device according to one embodiment, and  FIG.  2 E  is an exploded perspective view of the electronic device according to one embodiment. 
     Specifically,  FIGS.  2 A and  2 B  are views when the electronic device is in a “retracted state” and  FIGS.  2 C and  2 D  are views when the electronic device is in an “expanded state”. 
     Referring to  FIGS.  2 A to  2 E , an electronic device  201  (e.g., the electronic device  101  of  FIG.  1   ) may include a first housing  210  and a second housing  220  configured to form the exterior of the electronic device  201  and accommodate a component. The first housing  210  and the second housing  220  may be movably coupled to each other. 
     In one embodiment, the first housing  210  may be slidably coupled to the second housing  220 . The first housing  210  may be configured to move relative to the second housing  220  in an expansion direction (e.g., the +X direction) or move relative to the second housing  220  in a retraction direction (e.g., the −X direction) which is opposite to the expansion direction. Although it is described that in various embodiments of the present disclosure the first housing  210  moves relative to the second housing  220 , the embodiments are not limited thereto and it may also be construed that the second housing  220  slides relative to the first housing  210 . 
     In one embodiment, the first housing  210  may include a first surface  210 A (e.g., a first front surface), a second surface  210 B (e.g., a first rear surface) opposite to the first surface  210 A, a plurality (e.g., two) of first side surfaces (e.g., a first left side surface and a first right side surface) oriented in a direction (e.g., the +/−X direction) and positioned between the first surface  210 A and the second surface  210 B, and a plurality (e.g., two) of second side surfaces  210 D (e.g., a first upper side surface and a first lower side surface) oriented in another direction (e.g., the +/−Y direction) intersecting with the direction (e.g., the +/−X direction) and positioned between the first surface  210 A and the second surface  210 B. The plurality of side surfaces  210 D described above at various positions may be round surfaces. The first housing  210  may include at least one first hole H 1  formed in the second side surface  210 D (e.g., the first lower side surface) oriented in a direction (e.g., the −Y direction) among the second side surfaces  210 D. 
     In one embodiment, the second housing  220  may include a third surface  220 A (e.g., a second front surface), a fourth surface  220 B (e.g., a second rear surface) opposite to the third surface  220 A, a plurality (e.g., two) of third side surfaces  220 C (e.g., a second left side surface and a second right side surface) oriented in a direction (e.g., the +/−X direction) and positioned between the third surface  220 A and the fourth surface  220 B, and a plurality (e.g., two) of fourth side surfaces  220 D (e.g., a second upper side surface and a second lower side surface) oriented in another direction (e.g., the +/−Y direction) intersecting with the direction (e.g., the +/−X direction) and positioned between the third surface  220 A and the fourth surface  220 B. Among the plurality of third side surfaces  220 C, the third side surface  220 C oriented in one direction (e.g., the +X direction) may include an open portion  220 E that is at least partially open. The plurality of third side surfaces  220 C may be round surfaces. The second housing  220  may include at least one second hole H 2  formed in the fourth side surface  220 D (e.g., the second lower side surface) oriented in a direction (e.g., the −Y direction) among the plurality of fourth side surfaces  220 D. The second hole H 2  may be aligned, for example, with the first hole H 1 . 
     In one embodiment, the electronic device  201  may include a display module  261  (e.g., the display module  160  of  FIG.  1   ) including screen display areas, a first area  261 A, a second area  261 B, a third area  261 C, and a fourth area  261 D. The display module  261  may be any of a flexible display, a foldable display, and a rollable display. 
     In one embodiment, the screen display areas  261 A,  261 B,  261 C, and  261 D may include a first area  261 A on (or corresponding to) the first surface  210 A and the third surface  220 A, a second area  261 B on the third side surface  220 C oriented in a direction (e.g., the −X direction) among the third side surfaces  220 C, a third area  261 C on the third side surface  220 C oriented in the other direction (e.g., the +X direction) among the third side surfaces  220 C and at least partially enclosing the open portion  220 E, and a fourth area  261 D on the second surface  210 B and the fourth surface  220 B. 
     The, first area  261 A may be a portion of the display module  261  which is furthest from the housing, while the fourth area  261 D may be a portion of the display module  261  which is closest to the housing. The second area  261 B may connect the first and fourth areas  261 A and  261 D to each other, while the first area  261 A may connect the second and third areas  261 B and  261 C to each other. 
     In one embodiment, the second area  261 B and the third area  261 C of the display module  261  may include flexibly curved round surfaces. The second area  261 B may be partially on the first surface  210 A and the third surface  220 A. The third area  261 C may be partially on the first surface  210 A and the third surface  220 A. The third area  261 C may be partially on the second surface  210 B and the fourth surface  220 B. 
     In one embodiment, the display module  261  may be configured to partially display an image on or at a display screen. For example, the display module  261  may display the image at a display screen provided through the first area  261 A on the first surface  210 A and the third surface  220 A, while the second area  261 B, the third area  261 C, and the fourth area  261 D may display an image or provide a display screen at different points in time from that of the first area  261 A. The first area  261 A may define or correspond to a main display screen, while the various other areas may define a secondary display screen at the different points in time. The screen display area of the display module  261  (e.g., a planar area closest to the front of the electronic device  201 ) may expand or may retract as the first housing  210  moves in the expansion direction and the retraction direction. That is, a display area of the display module  261  may be expandable and retractable together with expansion and retraction of the housing. 
     In one embodiment, when viewed from a direction (e.g., the −Z direction), the electronic device  201  may change in shape between a first shape (e.g., a retracted state, the shape of  FIG.  2 A ) having the screen display area (e.g., a total planar area of the first area  261 A, the second area  261 B, and the third area  261 C) of a first size in a plan view (e.g., a view of the plane defined by a first direction and a second direction crossing each other, such as the X direction and the Y direction crossing each other), and a second shape (e.g., an expanded state, the shape of  FIG.  2 B ) having the screen display area (e.g., a total planar area of the first area  261 A, the second area  261 B, and the third area  261 C) that is larger than the first size. For example, when the first housing  210  moves relative to the second housing  220  in the expansion direction (e.g., the +X direction) from the first shape, the screen display area of the electronic device  201  viewed from a direction (e.g., the −Z direction) may expand as the size of the first area  261 A increases and the size of the fourth area  261 D decreases. From the second shape, when the first housing  210  moves relative to the second housing  220  in the retraction direction (e.g., the −X direction) opposite to the expansion direction, the size of the first area  261 A may decrease and the size of the fourth area  261 D may increase. While the electronic device  201  changes in shape between the first shape and the second shape, the size (e.g., planar area) of the second area  261 B and the size of the third area  261 C may be substantially constant. 
     In one embodiment, the electronic device  201  may include a slide device  300  including a drive device  310  configured to move the first housing  210  and the second housing  220  relative to each other. The slide device  300  may be connected to the first housing  210  and the second housing  220  and may slide one of the first housing  210  and the second housing  220  relative to the other housing  210  or  220 . As the first housing  210  or the second housing  220  moves, the display may expand or may retract. 
     In one embodiment, the electronic device  201  may include an input module  250  (e.g., the input module  150  of  FIG.  1   ). The input module  250  may be, for example, formed on the third side surface  220 C (e.g., the second left side surface) where the open portion  220 E is not formed, among the plurality of third side surfaces  220 C. 
     In one embodiment, the electronic device  201  may include a first sound output module  255 A (e.g., the sound output module  155  of  FIG.  1   ) and a second sound output module  255 B (e.g., the sound output module  155  of  FIG.  1   ). The first sound output module  255 A may be on a first portion (e.g., an upper portion) of the first housing  210 , and the second sound output module  255 B may be on a second portion (e.g., a lower portion) that is different from the first portion of the first housing  210 . 
     For example, in the first shape (e.g., the retracted state of the electronic device  201  of  FIG.  2 A ), the first sound output module  255 A may be configured to function as a transmitter/receiver and the second module  255 B may be configured to function as a speaker, whereas, in the second shape (e.g., the expanded state of the electronic device  201  of  FIG.  2 B ), the first sound output module  255 A and the second sound output module  255 B may be configured to function as a speaker. In the second shape, the first sound output module  255 A and the second sound output module  255 B may together output stereo sound. 
     In one embodiment, in the first shape, the second sound output module  255 B may be configured to emit sound through the first hole H 1  and the second hole H 2  substantially aligned with each other, and in the second shape, the second sound output module  255 B may be configured to emit sound through the first hole H 1 . At least one of the first sound output module  255 A and the second sound output module  255 B may be in the second housing  220 . The electronic device  201  may include only one of the first sound output module  255 A and the second sound output module  255 B, or may further include an additional sound output module in addition to the shown sound output modules. 
     In one embodiment, the electronic device  201  may include a haptic module  279  (e.g., the haptic module  179  of  FIG.  1   ). The haptic module  279  may include, for example, a vibrator configured to generate vibrations. The haptic module  279  may be in the second housing  220 . The haptic module  279  may be adjacent to the second sound output module  255 B. The haptic module  279  may be in the first housing  210 . 
     In one embodiment, the electronic device  201  may include a first camera module  280 A (e.g., the camera module  180  of  FIG.  1   ) and a second camera module  280 B (e.g., the camera module  180  of  FIG.  1   ). The first camera module  280 A may be configured to obtain an image of one direction (e.g., the +Z direction) of the electronic device  201 , and the second camera module  280 B may be configured to obtain an image of the other direction (e.g., the −Z direction) of the electronic device  201 . 
     In one embodiment, the first camera module  280 A and the second camera module  280 B may be in the second housing  220 . At least one of the first camera module  280 A and the second camera module  280 B may be in the first housing  210 . The electronic device  201  may include only one of the first camera module  280 A and the second camera module  280 B, or may further include an additional camera module in addition to the shown camera modules. 
     In one embodiment, the electronic device  201  may include a battery  289  (e.g., the battery  189  of  FIG.  1   ). The battery  289  may be in the first housing  210 . The battery  289  may be at least partially enclosed by, for example, the first sound output module  255 A, the first camera module  280 A, the second camera module  280 B, a first PCB  251 , the slide device  300 , a third PCB  253 , the haptic module  279 , and the second sound output module  255 B. The battery  289  may be in the second housing  220 . 
     In one embodiment, the electronic device  201  may include the first PCB  251 , a second PCB  252 , and the third PCB  253 . The first PCB  251 , the second PCB  252 , and the third PCB  253  may include a plurality of metal layers and a plurality of dielectrics each positioned between a pair of adjacent metal layers. The first PCB  251  may be in the second housing  220 . The first PCB  251  may include a first electronic component (e.g., the power management module  188  of  FIG.  1   ). The second PCB  252  may be in the first housing  210 . For example, the second PCB  252  may be electrically connected to the slide device  300 . The third PCB  253  may be in the second housing  220 . For example, the third PCB  253  may be electrically connected to the haptic module  279 . 
     In one embodiment, the electronic device  201  may include the housings  210  and  220 . Specifically, the electronic device  201  may include a first cover  211 , a first plate  212 , a second plate  213 , and a support structure  214 , and the first cover  211 , the first plate  212 , the second plate  213 , and the support structure  214  may together form the first housing  210 . The electronic device  201  may include a second cover  221  and a third plate  222 , and the second cover  221  and the third plate  222  may together form the second housing  220 . 
     In one embodiment, the first cover  211  may partially enclose the first sound output module  255 A, the first camera module  280 A, the haptic module  279 , and the second sound output module  255 B. The first plate  212  may at least partially accommodate electronic components (e.g., the slide device  300 , the first sound output module  255 A, the second sound output module  255 B, the first camera module  280 A, the second camera module  280 B, the first PCB  251 , the second PCB  252 , the third PCB  253 , the haptic module  279 , and other electronic components). The second plate  213  may be between the first plate  212  and the display module  261  and may support the slide device  300  and the display module  261 . 
     In one embodiment, the support structure  214  may include a base plate  214 A configured to flexibly bend and a plurality of support bars  214 B arranged along the base plate  214 A to be spaced apart from each other and configured to support the display module  261 . The second cover  221  may be slidably coupled to the first cover  211  to at least partially enclose the first cover  211 , where the first cover  211  is slidable relative to the second cover  221 . 
     In one embodiment, the second cover  221  may be configured to guide the plurality of support bars  214 B. The second cover  221  may expose at least a portion (e.g., the second camera module  280 B) of an electronic component to the outside of the electronic device  201 . The third plate  222  may enclose at least a portion of the second cover  221 . The third plate  222  may be formed of, for example, a glass material. The structures of the first housing  210  and the second housing  220  described herein are not limited to the shown embodiments and may be various types of structures. 
       FIG.  3 A  is a front perspective view of an electronic device according to one embodiment,  FIG.  3 B  is a rear perspective view of the electronic device according to one embodiment,  FIG.  3 C  is a front view of the electronic device according to one embodiment, and  FIG.  3 D  is a rear view of the electronic device according to one embodiment. Specifically,  FIGS.  3 A and  3 B  are views when an electronic device  301  is in a “retracted state” and  FIGS.  3 C and  3 D  are views when the electronic device  301  is in an “expanded state”. 
     Referring to  FIGS.  3 A to  3 D , the electronic device  301  (e.g., the electronic device  101  of  FIG.  1    or the electronic device  201  of  FIG.  2 A ) may include housings  310  and  320 . The housings  310  and  320  may include a first housing  310  and a second housing  320 . 
     In one embodiment, a pair of housings  310  and  320  may include the first housing  310  and the second housing  320 . The pair of housings  310  and  320  may include a first surface  311  facing a front surface (e.g., the +Z direction) of the electronic device  301  and a second surface  312  facing a direction opposite to the first surface  311 . 
     In one embodiment, in the retracted state, the first housing  310  may be inside the second housing  320  (e.g., completely inside) or a partial region of the first housing  310  may be exposed to the outside of the second housing  320 . In the expanded state, as the first housing  310  moves in the expansion direction (e.g., the −Y direction), the first housing  310  may be withdrawn from the inside of the second housing  320  to outside of the second housing  320 . Alternatively, the first housing  310  may be inserted into the second housing  320  as the first housing  310  moves in the retraction direction (e.g., the +Y direction). 
     In one embodiment, the second housing  320  may include a side surface member  323  extending from the first surface  311  to the second surface  312 . The side surface member  323  may include a first side surface  323   a  in one direction (e.g., the +Y direction), a second side surface  323   b  extending from one end of the first side surface  323   a , a third side surface  323   c  extending from the other end of the first side surface  323   a , and a fourth side surface  323   d  opposite to the first side surface  323   a . The side surface member  323  may be formed in an oblong (e.g., square or rectangular) shape through the first side surface  323   a , the second side surface  323   b , the third side surface  323   c , and the fourth side surface  323   d . The second housing  320  may be open at the fourth side surface  232   d , to provide an opening through which the first housing  310  is retractable into or expandable out of the second housing  320 .+ 
     In one embodiment, an auxiliary coupling unit  371  may be arranged at the side surface (e.g., the fourth side surface  323   d ) of the second housing  320 , as described with reference to  FIG.  4 A . The pair of housings  310  and  320  is not limited to the shape and combination shown in the drawings and may be implemented in a different shape or a different combination and/or coupling of components. 
     In one embodiment, the side surface member  323  may be formed of a metal or may further include a polymer injected into the metal. The side surface member  323  may include at least one conductive portion that is electrically segmented through at least one segment formed of a polymer. The at least one conductive portion may be used as an antenna operating in at least one designated band (e.g., a legacy band) by being electrically connected to a wireless communication circuit included in the electronic device  301 . 
     In one embodiment, a display module  361  (e.g., the display module  160  of  FIG.  1    or the display module  261  of  FIG.  2 A ) may be arranged on the first surface  311  of the pair of housings  310  and  320  and may expand or retract in interoperation with the movement of the first housing  310 . A portion of the display module  361  may be arranged inside the pair of housings  310  and  320  and another portion of the display module  361  may be supported by being connected to the first housing  310 . When the first housing  310  moves relative to the second housing  320 , the display module  361  may move together with the first housing  310 , and as the display module  361  is withdrawn from the inside of the housings  310  and  320  or inserted into the inside of the housings  310  and  320 , the display module  361  which is expanded or retracted may increase or decrease a screen display area. 
     For example, the electronic device  301  may expand as the first housing  310  moves in the expansion direction (e.g., the −Y direction) from the side surface (e.g., the fourth side surface  323   d ) of the second housing  320  or may retract as the first housing  310  moves in the retraction direction (e.g., the +Y direction). An end  313  of the first housing  310  may be moved in the expansion direction of the first housing by a force provided from outside the electronic device  301  (e.g., by a user) or from a force provided from inside the electronic device  301  like a drive module (not shown) of the electronic device  301 . As the first housing  310  expands, a surface  316  of the first housing  310  may be exposed to the outside of the housing  320  and outside of the electronic device  301 . The first housing  310  may support the display module  361  disposed on the surface  316 , and the display module  361  may expand or may retract with the surface  316  in interoperation with the movement of the first housing  310 . 
     In one embodiment, as the display module  361  expands, the display module  361  may be exposed to the outside of the housings  310  and  320  (and to outside the electronic device  301 ) and may adjust an expanded display area. Referring to  FIG.  3 C , the display module  361  may be divided into a partial region  361   a  and the other partial region  361   b  (e.g., a remaining region). The partial region  361   a  may be a region moved from the inside of the housings  310  and  320  to the outside of the housings  310  and  320  as the display module  361  expands and the other partial region  361   b  may be a region that moves as the second housing  320  expands from a surface (e.g., the first surface  311 ). Compared to the retracted state, the expanded display module  361  may have an expanded screen display area through an area before expansion (e.g., the partial region  361   a ) and an expanded area (e.g., the other partial region  361   b ) and may provide a wide screen to the user. 
     In one embodiment, the electronic device  301  in the retracted state of  FIGS.  3 A and  3 B  may improve portability by reducing an overall size of the electronic device  301 , and the electronic device  301  in the expanded state of  FIGS.  3 C and  3 D  may improve usability by providing a wide screen as the display module  361  expands. 
     In one embodiment, the electronic device  301  may include a first protective cover  315  (e.g., a first protective frame or a first decoration member) coupled along a periphery in a front surface direction (e.g., the +Z direction) of the housings  310  and  320  and a second protective cover  325  coupled along a periphery in a rear surface direction (e.g., the −Z direction). The first protective cover  315  and/or the second protective cover  325  may be formed of a metal or a polymer material, and the first protective cover  315  and/or the second protective cover  325  may be used as a decoration member. The first protective cover  315  and/or the second protective cover  325  may be formed of, for example, any one or any combination of any two or more of coated or tinted glass, ceramic, a polymer, and a metal (e.g., aluminum, stainless steel (STS), or magnesium). 
     In one embodiment, the electronic device  301  may include at least one of a sound output device  302  and camera devices  305  and  308 . They may correspond to the sound output module  155  and the camera module  180  of  FIG.  1    or the first and second sound output modules  255 A and  255 B and the first and second camera modules  280 A and  280 B of  FIG.  2   . A repeated description of the structure described above is omitted. 
     In one embodiment, the electronic device  301  may include a sensor module  304  (e.g., the sensor module  176  of  FIG.  1   ). The sensor module  304  may generate an electrical signal or a data value corresponding to an internal operating state of the electronic device  301  or an external environmental state. For example, the sensor module  304 , which is an illuminance sensor, may be arranged under the display module  361  to detect an external environment through the display module  361 . 
     In one embodiment, the sensor module  304  may include at least one of a gesture sensor, a gyro sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a color sensor, an IR sensor, a biometric sensor, a temperature sensor, a humidity sensor, an illuminance sensor, a proximity sensor, and an ultrasonic sensor. 
     In one embodiment, the camera devices  305  and  308  may include a first camera device  305  (e.g., a front camera device) on the first surface  311  of the second housing  320  and a second camera device  308  on the second surface  312  of the second housing  320 . The electronic device  301  may further include a flash  309  arranged near the second camera device  308 . The camera devices  305  and  308  may include one or more lenses, an image sensor, and/or an ISP. 
     In one embodiment, the flash  309  may include, for example, a light-emitting diode (LED) or a xenon lamp. The camera devices  305  and  308  may be arranged such that two or more lenses (e.g., a wide-angle lens, an ultra-wide lens, or a telephoto lens) and image sensors are disposed on the electronic device  301 . The camera devices  305  and  308  may include a lens for time of flight (TOF) and/or an image sensor. 
     In one embodiment, a key input device  306  (e.g., a key button) may be on the third side surface  323   c  of the side surface member  323  of the second housing  320 . The key input device  306  may be on the other side surfaces  323   a  or  323   b  of the second housing  320  and/or at least one side surface of the first housing  310 . The electronic device  301  may not include some or all of the key input devices  306 , and the key input devices  306  that are not included may be implemented in another form, such as a soft key on the display module  361 . The key input device  306  may be implemented by using a pressure sensor included in the display module  361 . 
       FIG.  4 A  is a perspective view of the electronic device  301  and an accessory device  350  according to one embodiment, and  FIG.  4 B  is a side view of the electronic device  301  and the accessory device  350  according to one embodiment. 
     Referring to  FIGS.  4 A and  4 B , the electronic device  301  may include the accessory device  350  that is attachable. The accessory device  350  may be removably attachable to the electronic device  301 , at various surfaces and/or components of the electronic device  301 . 
     In one embodiment, the accessory device  350  may be coupled to or separated from the housings  310  and  320  of the electronic device  301 . When the electronic device  301  is in the retracted state (e.g., the electronic device  301  which is completely retracted), the accessory device  350  may be separated from the electronic device  301  and carried, separately operate, or be charged. When the electronic device  301  is in the expanded state (e.g., the electronic device  301  which is partially or completely expanded), the accessory device  350  may be coupled to the electronic device  301  to support the expanded area of the electronic device  301  and may improve the performance of the electronic device  301  based on an internal component of the accessory device  350 . The accessory device  350  may be a separate product manufactured and/or sold separately from the electronic device  301 , or the accessory device  350  may be manufactured and sold with the electronic device  301  and may be attached to the electronic device  301  and used according to the needs of the user. The accessory device  350  may supplement a function of the electronic device  301  and/or provide an additional function of the electronic device  301 . 
     In one embodiment, the accessory device  350  may include a main body  351  including a mounting surface  390  and a coupling unit  370 . The mounting surface  390  may be a region where an expanded area of the first housing  310  (e.g., the partial region  310   a  of the first housing  310 ) exposed to the outside of the second housing  320  by moving from the second housing  320 , is mounted. The mounting surface  390  may support the expanded area  361   b  of the display module  361 . The mounting surface  390  may otherwise be referred to as a mounting portion or a supporting portion, and may be defined by a plurality of surfaces of the main body  351 . The mounting surface  390  may be defined in the form of a recess, a groove or stepped structure, defined by various portions of the main body  351 . The mounting surface  390  may also be considered a surface with which a recess or groove is defined. 
     In one embodiment, as the display module  361  expands, a partial region of the display module  361  may move relative to the second housing  320  and may be or define the “expanded area  361   b ” by protruding out if the upper surface of the second housing  320 , and the other region (e.g., remaining region) may remain inside of the housings  310  and  320 , located on the upper surface of the second housing  320  and be or define the “area  361   a  before expansion”. As the display module  361  moves, the “area  361   a  before expansion” may substantially become the expanded area withdrawn from the electronic device  301 . However, hereinafter, based on a state after expansion, an area on the upper surface of the second housing  320  may be the partial region  361   a  before expansion and an area escaping from the second housing  320  may be the expanded area  361   b.    
     In one embodiment, the second housing  320  may be larger and heavier than the first housing  310 , and the first housing  310  may be relatively smaller and lighter than the second housing  320 . For example, the second housing  320  may include various components, such as a battery, a processor, and a memory, and a weight of the first housing  310  may be limited or minimized since the first housing  310  is movable, and thus, the second housing  320  may be heavier than the first housing  310 . The partial region  361   a  before expansion may be supported by the first housing  310  and the second housing  320 , the expanded area  361   b  may be supported by the first housing  310  and the accessory device  350 , and the display module  361  may be stably protected. 
     In one embodiment, for example, when the accessory device  350  is not attached to the electronic device  301 , since an area expanded from the display module  361  is protected or supported only by the first housing  310 , the area may be relatively vulnerable to damage. Alternatively, when the electronic device  301  is gripped along in the horizontal direction (e.g., the +/−Y direction), gripping may be inconvenient due to the structure of the electronic device  301  and a difference between both ends of the electronic device  301 . Alternatively, when the electronic device  301  is used on an external support body (not shown), such as a floor or a table, the height relative to the external support surface, of the first housing  310  which is protruded outside of the second housing  320 , may be different from the height relative to the external support surface, of the second housing  320 , one surface (e.g., the surface  316  of  FIG.  3 D ) of the first housing  310  may be apart from the external support body (not shown), and the electronic device  301  may shake or may have a difficulty in touch recognition when the user touches the expanded area  361   b.    
     Referring to  FIG.  4 B , for example, the lower surface of the expanded area  310   a  may correspond to the surface  316  in  FIG.  3 D , and may be in a different plane than the lower surface of the second housing  320  which corresponds to the surface  312  in  FIG.  3 D . That is, where the lower surface of the second housing  320  corresponds to the external support surface, without the accessory device  350  attached to the electronic device  301 , the lower surface of the expanded area  310   a  would be further from the external support surface than the lower surface of the second housing  320 . As such, the accessory device  350  may compensate for a step difference between the lower surface of the expanded area  310   a  (e.g., surface  316  in  FIG.  3 D ) and the lower surface of the second housing  320  (e.g., surface  312 ), and more stably support the expanded areas defined as portions of the display module  361  and the first housing  310 . 
     Referring again to  FIG.  4 B , the accessory device  350  includes the main body which is detachably attachable to an electronic device  301  (including a housing having a planar size which is expandable in an expansion direction to define an expanded area of the housing, and a display module which is expandable in the expansion direction, together with the housing, to define an expanded area of the display module). The main body includes a mounting surface extended in the expansion direction, and the accessory device which is attached to the electronic device includes the mounting surface supporting the expanded area of the housing together with the expanded area of the display module. Further to this, the housing may include the first housing which is moveable relative to the second housing. The display module may be connected to the housing, and may be extendable in the expansion direction and retractable in the retraction direction, together with the first housing, to provide a display screen of the electronic device which is variable in size. 
     In one embodiment, the accessory device  350  may be attached to the electronic device  301  as necessary according to a usage environment of the electronic device  301 , may protect the display module  361  by supporting the first housing  310  having the display module  361  thereon, may provide unity of shape and weight of the electronic device  301  in (or along) the horizontal direction, and may secure convenience of using the electronic device  301  which is expanded. 
     In one embodiment, the accessory device  350  may support and protect the expanded areas that are expanded from the electronic device  301  and may customize the usability of the electronic device  301  according to the needs of the user through various components included in the accessory device  350 . The usability of the electronic device  301  may be customized by providing a function to the electronic device  301 , providing an aesthetic appearance to the electronic device  301 , etc. A description of improving usability of the accessory device  350  is provided with reference to  FIGS.  8 A to  8 C . 
     In one embodiment, the electronic device  301  may reduce the number of components included inside the electronic device  301 , may secure an internal space, and may realize miniaturization and slimness. When the electronic device  301  includes a component requiring a space, such as a battery module (e.g., a battery module  353  of  FIG.  8 A ), a camera module (e.g., an input module  355  of  FIG.  8 B ), a sound output module (e.g., a sound output module  356  of  FIG.  8 C ), the electronic device  301  may be heavy or large and the user may be inconvenienced to carry the electronic device  301 . By including a high-performance functional component in the accessory device  350  according to the needs of the user and including an essential component required to drive the electronic device  301  or a general performance component in the electronic device  301 , the electronic device  301  may be miniaturized and slim, economic feasibility in manufacturing may be secured, and the electronic device  301  may be customized for the user through the accessory device  350 . 
     In one embodiment, the main body  351  may accommodate the first housing  310  and may have a shape corresponding to the exterior of the second housing  320 . The main body  351  may include an upper surface facing a screen display direction of the display module  361  and a plurality of side surfaces  353   a ,  353   b ,  353   c , and  353   d  extending from the upper surface. The plurality of side surfaces  353   a ,  353   b ,  353   c , and  353   d  may include a first side surface  353   a  facing the expansion direction, a second side surface  353   b  opposite to the first side surface  353   a  and facing the retraction direction, and both side surfaces  353   c  and  353   d  extending from the first side surface  353   a  to the second side surface  353   b.    
     In one embodiment, the mounting surface  390  may be provided on the upper surface of the main body  351 . The mounting surface  390  may include a bottom surface  391  that supports the expanded area  310   a  of the first housing  310  and a plurality of inner side surfaces  393   a ,  393   b , and  393   c  extending from the bottom surface  391 . The plurality of inner side surfaces  393   a ,  393   b , and  393   c  may include a first inner surface  393   c  facing the expansion direction and both inner side surfaces  393   b  and  393   c  extending from the first inner side surface  393   a  to both sides of the mounting surface  390 . The various inner side surfaces together with the bottom surface  391  may define a recess (e.g., such as a coupling groove  375   a ) in which expanded portions of the display module  361  and the first housing  310  are disposed. 
     In one embodiment, the side surface  323   d  in the expansion direction of the second housing  320  of the electronic device  301 , may be coupled to the accessory device  350  in a direction facing the side surface  353   d  of the accessory device  350 . 
     In one embodiment, an external connecting terminal  307  may be provided on at least one of the plurality of side surfaces  323   a ,  323   b ,  323   c , and  323   d  of the electronic device  301 . For example, among the plurality of side surfaces  323   a ,  323   b ,  323   c , and  323   d , the external connecting terminal  307  may be provided on one of the second side surface  323   b  and the third side surface  323   c  facing the expansion direction and adjacent to the fourth side surface  323   d  coupled to the accessory device  350 . When the accessory device  350  is coupled to or separated from the electronic device  301 , the user may charge the electronic device  301  and/or the accessory device  350  or may transmit/receive data from the outside, through the external connecting terminal  307 . 
     In one embodiment, the external connecting terminal  307  may be provided on at least one of the plurality of side surfaces  323   a ,  323   b ,  323   c , and  323   d  of the electronic device  301  and at least one of the plurality of side surfaces  353   a ,  353   b ,  353   c , and  353   d  of the accessory device  350 . When the external connecting terminal  307  is provided at the accessory device  350 , the accessory device  350  may be independently charged and may transmit/receive data from the outside and be separated from the electronic device  301 . 
     However, the example is not limited thereto. The external connecting terminal  307  may be provided on a partial region of the main body  351 , the housings  310  and  320  of the accessory device  350 , and the electronic device  301 . 
     In one embodiment, the plurality of side surfaces  323   a ,  323   b ,  323   c , and  323   d  of the electronic device  301  and the plurality of side surfaces  353   a ,  353   b ,  353   c , and  353   d  of the accessory device  350  may be side surfaces in a plane (e.g., an X-Y plane) direction when viewing the electronic device  301  and the accessory device  350  in a screen display direction (e.g., the +Z direction) of the electronic device  301 . In a coupled state, the side portions which define the side surfaces  323   c  and  323   b  of the second housing  320  of the electronic device  301  may be coupled to and aligned with side portions which define the inner side surfaces  393   b  and  393   c  of the main body  351  of the accessory device  350 , respectively, and the side surface  323   a , in the retraction direction, of the second housing  320  may be opposite to the inner side surface  393   a  of the main body  351  of the accessory device  350  along a length of the accessorized electronic device. Some side surfaces  323   d  and  353   d  may face each other along a connection direction (e.g., Y direction) in the accessorized electronic device. The side surfaces  323   d  and  353   d  may contact each other, such as to form an interface therebetween, without being limited thereto. The second housing  320  and the main body  351  may have structures corresponding to each other to provide unity in the exterior and in the coupled state, the second housing  320  and the main body  351  may substantially have continuous structures. 
     In one embodiment, the coupling unit  370  may detachably couple or removably attach the main body  351  of the accessory device  350 , to the housings  310  and  320  of the electronic device  301 . The coupling unit  370  may be arranged in a direction facing the housings  310  and  320  from the main body  351 , and may be provided on the side surface  353   d  of the main body  351 . The coupling unit  370  may be implemented in various shapes and structures, such as a magnetic body, a hook, a bracket, and a bent structure. 
     In one embodiment, the accessory device  350  and the electronic device  301  may respectively include the coupling unit  370  (e.g., a first coupling member) and the auxiliary coupling unit  371  (e.g., a second coupling member) coupling and supporting each other. The auxiliary coupling unit  371  may be provided at the surface  323   d  of the housings  310  and  320  in the expansion direction and may be arranged to face the coupling unit  370  when the accessory device  350  is coupled to the electronic device  301 . The auxiliary coupling unit  371  may be implemented in various structures that may fasten the coupling unit  370  corresponding to the structure, shape, and location of the coupling unit  370 . 
     In one embodiment, the accessory device  350  may include a connecting unit  380  configured to electrically connect the electronic device  301  to the accessory device  350 . The connecting unit  380  may be arranged in a direction facing the housings  310  and  320  from the main body  351 , and may be provided on the surface  353   d  of the main body  351 . The connecting unit  380  may include a connecting terminal physically connectable to the electronic device  301 . The connecting terminal may be connected to the electronic device  301  and may transmit/receive at least one of an electrical signal and power to/from the accessory device  350 . 
     In one embodiment, the accessory device  350  and the electronic device  301  may include the connecting unit  380  and an auxiliary connecting unit  381  electrically connecting to each other. The auxiliary connecting unit  381  may be provided on the surface  323   d  of the housings  310  and  320  in the expansion direction and may be arranged to face the connecting unit  380  when the accessory device  350  is coupled the electronic device  301 . The auxiliary connecting unit  381  may be implemented in various structures that may connect to the connecting unit  380  corresponding to the size and location of the connecting unit  380 . 
     In one embodiment, the accessory device  350  and the electronic device  301  may include a connecting pin  383  and a connecting groove  385 , respectively, for connecting to each other. The accessory device  350  and the electronic device  301  may include a plurality of connecting pins  383  and a plurality of connecting grooves  385 , respectively, and the connecting pin  383  may be inserted into the connecting groove  385 . The connecting pin  383  may be provided on the side surface  353   d  of the main body  351 , and the connecting groove  385  may be provided in the surface  323   d  of the housings  310  and  320  in the expansion direction. The connecting pin  383  and the connecting groove  385  may be arranged to face each other when the accessory device  350  is coupled to the electronic device  301 . 
     In one embodiment, the connecting pin  383  may function as the coupling unit  370  or the connecting unit  380  or may simultaneously function as the coupling unit  370  and the connecting unit  380 . The connecting pin  383  may be implemented by a jig pin or a pogo pin, which is a cylindrical spring pin, and may physically and/or electrically connect the accessory device  350  to the electronic device  301 . One or more of the pairs of the coupling unit  370  and the auxiliary coupling unit  371 , the connecting unit  380  and the auxiliary connecting unit  381 , and the connecting pin  383  and the connecting groove  385  may provide a coupling structure which removably attaches the electronic device  301  to the accessory device  350 . That is, the coupling unit which detachably attaches the main body of the accessory device to the housing of the electronic device, may also electrically connect the electronic device to the accessory device. In an embodiment, the electronic device  301  may be removably attachable to the accessory device  350  solely by one of the pairs of mating coupling structures noted above. 
     In one embodiment, the connecting unit  380  may include a wireless communication module (not shown) configured to wirelessly connect the accessory device  350  to the electronic device  301 . The connecting unit  380  may not physically connect the accessory device  350  to the electronic device  301  and may be wirelessly connected to the electronic device  301  and transmit/receive an electrical signal to/from the electronic device  301 , or may transmit/receive power through a wireless charging method. The wireless communication module (not shown) may detect and automatically connect the electronic device  301  to the accessory device  350  when the electronic device  301  is adjacent to the accessory device  350 , such as Bluetooth or a near field communication (NFC) tag. 
     In one embodiment, although  FIG.  4 A  illustrates that the coupling unit  370 , the connecting unit  380 , and the connecting pin  383  are separate units, this is an example to describe the coupling between the accessory device  350  and the electronic device  301 . The actual implementation is not limited thereto. For example, the accessory device  350  may include only one of the coupling unit  370 , the connecting unit  380 , and the connecting pin  383 . Alternately, one structure included in the accessory device  350  may simultaneously function as any two or more of the coupling unit  370 , the connecting unit  380 , and the connecting pin  383 . 
     For example, when there is a C-type or A-type connecting terminal, the connecting terminal may be the connecting unit  380  or the connecting pin  383 . Since the connecting terminal is inserted into the housings  310  and  320  and supports the main body  351 , the connecting terminal may be included in the coupling unit  370 . 
     Hereinafter, to describe the accessory device  350  attachable to the housings  310  and  320  of the electronic device  301 , repeated descriptions thereof are omitted and the various coupling and connecting methods of the accessory device  350  and the electronic device  301  and the structure of the accessory device  350  are mainly described. 
       FIG.  5 A  is a side view of the electronic device  301  and the accessory device  350  according to one embodiment,  FIG.  5 B  is a side view of the electronic device  301  and the accessory device  350  according to one embodiment,  FIG.  5 C  is a side view of the electronic device  301  and the accessory device  350  according to one embodiment, and  FIG.  5 D  is a side view of the electronic device  301  and the accessory device  350  according to one embodiment. 
     Referring to  FIGS.  5 A to  5 D , the coupling unit  370  may include a first coupling unit  370   a  and a second coupling unit  370   b.    
     In one embodiment, the coupling unit  370  may be provided in a region contacting the housings  310  and  320  in the main body  351  and may include a magnetic body electromagnetically interacting with the housings  310  and  320 . In this case, the housings  310  and  320  may include an auxiliary magnetic body facing the magnetic body in the coupled state. The magnetic body and the auxiliary magnetic body may be formed of magnetite having magnetism or a metal including a magnetic material. Alternatively, one of the magnetic body and the auxiliary magnetic body may include an electromagnetic induction device generating an electromagnetic force and may generate an attractive force using a mutual electromagnetic force. 
     In one embodiment, a plurality of coupling units  370  may be provided and may include the first coupling unit  370   a  and the second coupling unit  370   b . The first coupling unit  370   a  may be provided at an end of the main body  351  (e.g., the side surface  353   d ), for example, one end contacting the second housing  320 , and may support the main body  351  when the main body  351  is coupled to the housings  310  and  320 . The second coupling unit  370   b  may be provided on the expanded area of the first housing  310  in the main body  351  and may be coupled to the first housing  310  when the first housing  310  is in the expanded state. The second coupling unit  370   b  may be provided on the inner side surface  393   a  of the mounting surface  390 . 
     In one embodiment, the electronic device  301  may include a first auxiliary coupling unit  371   a  coupled to the first coupling unit  370   a , and a second auxiliary coupling unit  371   b  coupled to the second coupling unit  370   b . The first coupling unit  370   a  may be provided at the end  323   d , of the second housing  320 , facing the accessory device  350 , and the second auxiliary coupling unit  371   b  may be provided at one end of the first housing  310  in the expansion direction. In an embodiment the coupling unit includes the first coupling unit provided at a first end of the main body which is closest to the housing, and the second coupling unit provided at a second end of the main body which is opposite to the first end. The accessory device  350  which is attached to the electronic device  301  includes the first coupling unit coupled to a non-expanded area of the housing, and the second coupling unit coupled to the expanded area of the housing. 
     Hereinafter, a description of an operation of coupling the accessory device  350  to the electronic device  301  and an operation of expanding the electronic device  301  is provided with reference to  FIGS.  5 A to  5 D . 
     Referring to  FIGS.  5 A and  5 B , the electronic device  301  may approach the accessory device  350  by a predetermined distance or more, and the first coupling unit  370   a  and the first auxiliary coupling unit  371   a  may generate a mutual attractive force, indicated by the double-headed arrow in  FIG.  5 A . The first coupling unit  370   a  may guide the accessory device  350  such that the accessory device  350  may be coupled to an appropriate location of the electronic device  301 . 
     Referring to  FIGS.  5 C and  5 D , the display module  361  may extend as the first housing  310  moves and when the display module  361  extends over a predetermined length, the second coupling unit  370   b  and the second auxiliary coupling unit  371   b  may generate a mutual attractive force, indicated by the double-headed arrow in  FIG.  5 C . The second coupling unit  370   b  may guide the first housing  310  and the display module  361  such that the first housing  310  and the display module  361  may be coupled to an appropriate position of the mounting surface  390 .  FIG.  5 D  shows a completed coupling of the electronic device  301  to the accessory device  350 . From the complete coupling of  FIG.  5 D , the accessory device  350  may be separated from the electronic device  301  such as by providing an external force greater than the attractive force applied to the coupling unit  370  and the auxiliary coupling unit  371 . 
     In one embodiment, the coupling unit  370  of the accessory device  350  may be provided adjacent to the mounting surface  390  of the main body  351  and may include or define a coupling groove  375   a  in a shape corresponding to the shape of the expanded area of the first housing  310 , which is defined by an outer surface of the first housing  310  (e.g., an outer shape). For example, the first housing  310  may include a bracket  375   b  provided on a surface facing the mounting surface  390  in the coupled state and the coupling groove  375   a  may have a shape corresponding to the bracket  375   b . The bracket  375   b  may be inserted into the coupling groove  375   a  and fixed while the first housing  310  expands. 
     In an embodiment, the bracket  375   b  of the first housing  310  and the display module  361  may each be fixed to the second auxiliary coupling unit  371   b , and movable together with each other (refer to  FIGS.  5 C and  5 D ). Distal ends of the bracket  375   b  of the first housing  310  and the display module  361  may be fixed to the second auxiliary coupling unit  371   b . A length of the bracket  375   b  along the Y direction may be equal to or less than a length of the coupling groove  375   a  along the Y direction. Referring to  FIG.  5 D , a portion of the bracket  375   b  may remain within the second housing  320 , even when the first housing  310  (or the display module  361 ) is in full extension. 
     When the electronic device  301  is coupled to the accessory device  350 , the bracket  375   b  may guide the first housing  310  to move in a preset direction and may support the first housing  310  to be fixed to the mounting surface  390 . The coupling groove  375   a  and the bracket  375   b  may be one of the examples of the coupling unit  370  and the auxiliary coupling unit  371 . 
       FIG.  6    is a side view of the electronic device  301  and the accessory device  350  according to one embodiment. 
     Referring to  FIG.  6   , the electronic device  301  and the accessory device  350  may include various types of the coupling units  370 .  FIG.  6    is a diagram to describe various coupling units  370  in the electronic device  301  and the accessory device  350  of  FIGS.  5 A to  5 D , and a repeated description thereof is omitted. 
     In one embodiment, the coupling unit  370  may include a plurality of coupling units  370  configured to connect the accessory device  350  to the electronic device  301  and support the accessory device  350  and the electronic device  301 . The plurality of coupling units  370  may be formed of a magnetic body and may support the accessory device  350  and the electronic device  301  by using a magnetic force. However, the example is not limited thereto, and the plurality of coupling units  370  may be closely connected to each other through the shape and structure of the coupling unit  370 . 
     For example, when the electronic device  301  is coupled to the accessory device  350 , a pair of side surfaces  323   d  and  353   d  facing each other may have bent structures to correspond to each other. For example, the side surface  323   d  of the electronic device  301  may protrude in a direction (e.g., the −Y direction) and the side surface  353   d  of the accessory device  350  may recess in an opposite direction (e.g., the +Y direction) to be coupled to the side surface  323   d  of the electronic device  301 . The pair of side surfaces  323   d  and  353   d  may face and couple to each other and may support the accessory device  350  and the electronic device  301 . The pair of side surfaces  323   d  and  353   d  facing each other may be a pair of coupling units  370 . 
     For example, as the second coupling unit  370   b  is arranged on one end of the mounting surface  390  and the second auxiliary coupling unit  371   b  is arranged on one end of the first housing  310  in the expansion direction, the second coupling unit  370   b  and the second auxiliary coupling unit  371   b  may maintain the electronic device  301  to be fixed to the accessory device  350  by applying mutual attraction or mutually fastening to each other. 
       FIG.  7 A  is a side view of the electronic device  301  and the accessory device  350  according to one embodiment,  FIG.  7 B  is a side view of the electronic device  301  according to one embodiment, and  FIG.  7 C  is a side view of the accessory device  350  according to one embodiment. 
     Referring to  FIGS.  7 A to  7 C , the accessory device  350  may include a hook  376  and the electronic device  301  may include a fastening groove  376   c  into which the hook  376  is inserted.  FIGS.  7 A to  7 C  are diagrams to describe various coupling units  370  and connecting units  380  of the electronic device  301  and the accessory device  350  of  FIGS.  5 A to  5 D , and repeated descriptions thereof are omitted. 
     In one embodiment, the coupling unit  370  may be provided on the surface  353   d  contacting the housings  310  and  320  in the main body  351  and may include the hook  376  that is inserted into the housings  310  and  320 . The hook  376  may include a pillar area  376   a  and a fastening area  376   b  and the electronic device  301  may include the fastening groove  376   c  into which the pillar area  376   a  and the fastening area  376   b  of the hook  376  are inserted. The hook  376  may be inserted into the fastening groove  376   c  and may be fixed and separated thereto and therefrom. 
     For example, when the hook  376  is inserted into the fastening groove  376   c  of the housings  310  and  320 , the fastening area  376   b  may move inside the pillar area  376   a  and when the hook  376  is completely inserted into the fastening groove  376   c , the fastening area  376   b  may move outside of the pillar area  376   b  and may fix the hook  376  to the fastening groove  376   c . The user may control the fastening area  376   b  to move inside or outside the pillar area  376   b  by a separate control and may couple or separate the accessory device  350  to or from the electronic device  301 . 
     For example, the fastening groove  376   b  may have a movable pressing structure to fix or separate the fastening area  376   b  and the user may couple or separate the accessory device  350  to or from the electronic device  301  to push the fastening area  376   b  by using the pressing structure of the fastening groove  376   c.    
     In one embodiment, the electronic device  301  may include the auxiliary connecting unit  381  on the center of the surface  323   d  of the second housing  320  and the plurality of auxiliary coupling units  371  spaced apart from each other in both directions (e.g., the +/−X direction). The plurality of auxiliary coupling units  371  may be provided adjacent to the pair of side surfaces  323   b  and  323   c  of the second housing  320 . The accessory device  350  may include the connecting unit  380  on the center of the surface  353   d  of the main body  351  and a plurality of coupling units  370  spaced apart from each other in both directions (e.g., the +/−X direction). The plurality of coupling units  370  may be provided adjacent to the pair of side surfaces  353   b  and  353   c  of the main body  351 . 
     In one embodiment, the connecting unit  380  may include a terminal and may have an outwardly protruding structure, and the auxiliary connecting unit  381  may include a terminal groove to which the connecting unit  380  is fastened and may have an inwardly protruding structure. The plurality of coupling units  370  and the plurality of auxiliary coupling units  371  may be formed of a magnetic body and may generate an attractive force. 
     In one embodiment, the first housing  310  may include a first bent part  310   b  bent in both directions (e.g., the +/−X directions) perpendicular to the expansion direction from the center of the first housing  310 . The accessory device  350  may include a second bent part  391  bent in both directions (e.g., the +/−X directions) corresponding to the first bent part  310   b . The first bent part  310   b  and the second bent part  391  may guide to a moving path of the first housing  310  on the mounting surface  390  and may fix the first housing  310  to prevent the first housing  310  from escaping from the mounting space  390  in the coupled state. The first bent part  310   b  and the second bent part  391  may be one example of the pair of coupling units  370  and  371 . 
     In one embodiment, the plurality of coupling units  370  and the plurality of auxiliary coupling units  371  may guide a coupling direction of the electronic device  301  and the accessory device  350 . The connecting unit  380  and the auxiliary connecting unit  381  may couple and electrically connect the electronic device  301  to the accessory device  350 . In the coupled state, the first bent part  310   b  and the second bent part  391  may guide to a moving path of the first housing  310  and may assist the first housing  310  to stably expand and to be fixed to the mounting surface  390 . 
     In one embodiment, the electronic device  301  and the accessory device  350  of  FIGS.  5 A to  7 C  is to describe the coupling unit  370  and the connecting unit  380  in various embodiments. In the actual implementation, the example is not limited to the shown structure and location and may be implemented in various ways by transforming in a transformable range, omitting some structures, and adding or replacing other structures. 
       FIG.  8 A  is a diagram illustrating a configuration of the accessory device  350  according to one embodiment,  FIG.  8 B  is a diagram illustrating a configuration of the accessory device  350  according to one embodiment, and  FIG.  8 C  is a diagram illustrating a configuration of the accessory device  350  according to one embodiment. 
     Referring to  FIGS.  8 A to  8 C , the accessory device  350  may include at least one of a battery module  353 , a memory module  354 , an input module  355 , and an output module  356 . 
     In one embodiment, the accessory device  350  may be arranged inside the main body  351  and may include a controller  352  configured to control driving of the accessory device  350 . The controller  352  may be connected to the connecting unit  380  and may be connected to the electronic device  301  through the connecting unit  380 . The controller  352  may detect the connection to the electronic device  301  and may transmit/receive an electrical signal to/from the electronic device  301 . 
     In one embodiment, the accessory device  350  may include the battery module  353 . The battery module  353  may supply power to drive the accessory device  350  or may function as an auxiliary battery configured to supply power to drive the electronic device  301 . The electronic device  301  may need to secure a space for a battery (e.g., the battery  189  of  FIG.  1   ) to be miniaturized and driven with high performance, simultaneously. The accessory device  350  may assist the battery  189  of the electronic device  301  to supply power to the electronic device  301  and may function as the auxiliary battery to drive the electronic device  301 . The accessory device  350  may decrease a space of the battery  189  in the internal structure design of the electronic device  301  through the battery module  353  configured to function as the auxiliary battery and may help the electronic device  301  to be miniaturized and improve the performance of the electronic device  301 . 
     In one embodiment, the battery module  353  may be charged by being connected to an external power supply device (not shown) through the connecting unit  380  of the accessory device  350  or a separate charging terminal (not shown). Alternatively, the battery module  353  may be charged together with the battery of the electronic device  301  when the electronic device  301  is connected to the external power supply device (not shown) while the battery module  353  is connected to the electronic device  301 . 
     In one embodiment, as shown in  FIG.  8 A , the accessory device  350  may include the memory module  354 . The memory module  354  may be a memory device to drive the accessory device  350  or may function as an auxiliary memory configured to store data to drive the electronic device  301  and provide the data to the electronic device  301 . The memory module  354  may be connected to the controller  352 , and the controller  352  may be connected to a processor (e.g., the processor  120  of  FIG.  1   ) through the connecting unit  380  and may transmit or receive data to or from the electronic device  301 . 
     In one embodiment, as shown in  FIG.  8 B , the accessory device  350  may include the input module  355 . The input module  355  may receive a signal from the outside and may transmit an input signal to the electronic device  301 . For example, the input module  355  may be a high performance camera module. The electronic device  301  may require a relatively large lens and a sensor to provide a high performance camera function, and thus, may have an external figure in which a camera protrudes from the housings  310  and  320  of the electronic device  301  and a space occupied by the camera module (e.g., the camera module  180  of  FIG.  1   ) in the electronic device  301  may increase. The accessory device  350  may assist the camera module of the electronic device  301  to provide the high performance camera function to the electronic device  301 , may decrease a space of the camera module  180  in the internal structure design of the electronic device  301 , and may help the electronic device  301  to be miniaturized and improve the performance of the electronic device  301 . 
     In one embodiment, the input module  355  may be implemented as various input devices other than the camera module. For example, the input module  355  may be a sensor module or an input device configured to control driving of the electronic device  301 , such as a physical keyboard or a touch pad. 
     In one embodiment, as shown in  FIG.  8 C , the accessory device  350  may include the output module  356 . The output module  356  may output an output signal received from the electronic device  301  to the outside. For example, the output module  356  may be a sound output module with a high performance speaker function. The electronic device  301  may require a relatively large diaphragm or a resonant space to provide the high performance speaker function, and thus, a space occupied by the sound output module (e.g., the sound output module  155  of  FIG.  1   ) in the electronic device  301  may increase. The accessory device  350  may assist the sound output module  155  of the electronic device  301  to provide the high performance speaker function to the electronic device  301 , may decrease a space of the sound output module  155  in the internal structure design of the electronic device  301 , and may help the electronic device  301  to be miniaturized and improve the performance of the electronic device  301 . 
     In one embodiment, the output module  356  may be implemented as various input devices other than the speaker module. For example, the output module  356  may be a module device including a sub-display module configured to assist a display module (e.g., the display module  160  of  FIG.  1   ) of the electronic device  301 . Alternatively, the output module  356  may be wireless earphones and the accessory device  350  may be a case to charge the wireless earphones and protect the wireless earphones to be easily carried. 
       FIG.  9 A  is a front view of the electronic device  301  and the accessory device  350  according to one embodiment,  FIG.  9 B  is a front view of the accessory device  350  according to one embodiment, and  FIG.  9 C  is a front view of the accessory device  350  according to one embodiment. 
     Referring to  FIGS.  9 A to  9 C , the accessory device  350  may include a first body  351   a  and a second body  351   b . To describe  FIGS.  9 A to  9 C , a repeated description thereof is omitted. 
     In one embodiment, the main body  351  may include the first body  351   a  coupled to the housings  310  and  320  and the second body  351   b  configured to be movable in the expansion direction (e.g., the −Y direction) and the retraction direction (e.g., the +Y direction) in which the housings  310  and  320  are moveable relative to the first body  351   a . The first body  351   a  may face the second housing  320  of the electronic device  301 , and the second body  351   b  may be arranged in a direction opposite to the electronic device  301  based on the first body  351   a.    
     In one embodiment, the mounting surface  390  may be provided at the first body  351   a  and the second body  351   b  and may expand or retract in interoperation with expansion and reduction of the main body  351  as the second body  351   b  moves. As the second body  351   b  moves in the expansion direction and the retraction direction, the main body  351  may expand or retract. 
     In one embodiment, when the second body  351   b  is moved, the main body  351  may include an auxiliary expanded area  351   c  added in the expansion direction and the mounting surface  390  may include an expanded mounting area  390   a  corresponding to the auxiliary expanded area  351   c  provided by expansion of the main body  351 . 
     In one embodiment, the first housing  310  of the electronic device  301  may move according to the expansion state of the main body  351 , and the display module  361  may expand in interoperation with the first housing  310 . That is, the second body may be expandable and retractable, together with expansion and retraction of the housing of the electronic device, and the second body which is expanded together with the housing defines the mounting surface by a surface of the first body together with a surface of the second body. As the main body  351  expands, the display module  361  may expand by the expanded mounting area  390   a  of the mounting surface  390  and screen display areas of the electronic device  301  and the accessory device  350  may increase. The main body  351 , which is expandable, may decrease the volume of the accessory device  350  when separated from the electronic device  301 , and may improve portability of the accessory device  350 . 
     In one embodiment, the first body  351   a  may include an expansion member  357  including a rail  357   a  extending in a second body  351   b  direction (e.g., the −Y direction) and a bump  357   b  configured to limit expansion of the first body  351   a  and the second body  351   b  may move in interoperation with the rail  357   a  and may expand or retract the main body  351 . 
     In one embodiment, the accessory device  350  may include expansion sensors  358   a  and  358   b  configured to sense a moving state of the second body  351   b . For example, the expansion sensors  358   a  and  358   b  may include the first sensor  358   a  on the first body  351   a  and the second sensor  358   b  on the second body  351   b , respectively. The first sensor  358   a  and the second sensor  358   b  may face each other and may sense a distance between the first body  351   a  and the second body  351   b  as the first body  351   a  and the second body  351   b  move, and the accessory device  350  may sense the expansion state of the accessory device  350  based on a distance between the first sensor  358   a  and the second sensor  358   b . For example, the expansion sensors  358   a  and  358   b  may be an optical sensor or a magnetic sensor. 
       FIG.  10 A  is a front view of the electronic device  301  according to one embodiment,  FIG.  10 B  is a front view of the electronic device  301  according to one embodiment,  FIG.  10 C  is a front view of the electronic device  301  and the accessory device  350  according to one embodiment, and  FIG.  10 D  is a front view of the electronic device  301  and the accessory device  350  according to one embodiment. 
     Referring to  FIGS.  10 A to  10 D , the electronic device  301  may include the side cover  330  detachable from the electronic device  301  and/or the accessory device  350 . 
     In one embodiment, as shown in  FIGS.  10 A and  10 B , the side cover  330  may be coupled to the surface  323   d  of the electronic device  301 , such as being directly coupled to the electronic device  301 , without being limited thereto. The side cover  330  may be coupled to or separated from the side surface  323   d  of the electronic device  301  in the expansion direction (e.g., the −Y direction). 
     In one embodiment, the side cover  330  may include a surface  330   a  facing the expansion direction, side surfaces  330   b  and  330   c  extending from the surface  330   a  to both ends, respectively, and a surface  330   d  extending from the side surfaces  330   b  and  330   c  and facing the electronic device  301 . The side cover  330  may include a first fixing member  331  protruding from the surface  330   d  and the housings  310  and  320  may include a fixing groove  332  provided in the surface  323   d  to insert the first fixing member  331  therein. 
     In one embodiment, the side cover  330  may be coupled to the second housing  320  when the electronic device  301  is in the retracted state, and the user may separate the side cover  330  from the electronic device  301  by an operation before expanding the electronic device  301 . 
     In one embodiment, as shown in  FIGS.  10 C and  10 D , the accessory device  350  may be coupled to the surface  323   d  of the electronic device  301 , such as being directly coupled thereto, and the side cover  330  may be coupled to the surface  353   a  of the accessory device  350 . That is the side cover  330  may be indirectly coupled to the main electronic device (e.g., the electronic device  301 ) by the accessory device  350  as an intervening member. The accessory device  350  and the side cover  330  may be coupled to or separated from the electronic device  301  and the side surfaces  323   d  and  353   a  of the accessory device  350  in the expansion direction (e.g., the −Y direction), respectively. 
     In one embodiment, the accessory device  350  may include a second fixing member  376  (e.g., hook  376  in  FIGS.  7 A to  7 C ) protruding from the surface  353   d  facing the electronic device  301 , and the accessory device  350  may include a fixing groove  332  provided in the surface  353   a  facing the side cover  330  to insert the first fixing member  331  therein. 
     In one embodiment, the electronic device  301  may be coupled to the accessory device  350 , the accessory device  350  may be coupled to the side cover  330 , and the first housing  310  and the display module  361  may move from the top of the mounting surface  390  to a region adjacent to the side cover  330 . 
     For example, when the accessory device  350  is coupled to the side cover  330 , the first housing  310  may contact or substantially overlap with the surface  330   d  of an end (e.g., the first inner side surface  393   a ) of the mounting surface  390  and the first housing  310  may expand to the end (e.g., the first inner side surface  393   a ) of the mounting surface  390 . The screen display area of the display module  361  may expand from the partial region  361   a  before expansion to the expanded area  361   b.    
     In one embodiment, the side cover  330 , which is selectively attachable to the electronic device  301  and the accessory device  350 , may reduce the volume of the accessory device  350  when accessory device  350  is separated from the electronic device  301  and may improve portability of the accessory device  350 . In addition, when the accessory device  350  is separated from the electronic device  301 , the side cover  330  may protect the auxiliary coupling unit  371  and the auxiliary connecting unit  381  of the electronic device  301  from being exposed to the outside and may prevent water or a foreign material from entering the inside of the electronic device  301 . 
     In one embodiment, the accessory device  350  attachable to the electronic device  301  including the housings  310  and  320 , which are expandable, and the display module  361  expanding in interoperation with the housings  310  and  320  may include the main body  351  including the mounting surface  390  configured to mount an expanded area of the housings  310  and  320  and support the expanded area  361   b  of the display module  361  and the coupling unit  370  detachably coupling the main body  351  to the housings  310  and  320 . 
     In one embodiment, the coupling unit  370  may include a magnetic body provided in a region contacting the housings  310  and  320  in the main body  351  and configured to electrically and mutually interact with the housings  310  and  320 . 
     In one embodiment, the coupling unit  370  may include the hook  376  provided in the region contacting the housings  310  and  320  in the main body  351  and inserted into the housings  310  and  320 . 
     In one embodiment, the coupling unit  370  may include the coupling groove  375   a  provided adjacent to the mounting surface  390  of the main body  351  and have the shape corresponding to the shape of the expanded area of the housings  310  and  320 . 
     In one embodiment, the coupling unit  370  may include the first coupling unit  370   a  provided on the end of the main body  351  and configured to support the main body  351  when coupled to the housings  310  and  320  and the second coupling unit  370   b  coupled to the expanded area of the housings  310  and  320  in the main body  351 . 
     In one embodiment, the accessory device  350  may include the connecting unit  380  configured to electrically connect the electronic device  301  to the accessory device  350 . 
     In one embodiment, the connecting unit  380  may include the connecting terminal connected to the electronic device  301  and configured to transmit/receive at least one of an electrical signal and power. 
     In one embodiment, the connecting unit  380  may include a wireless connection module wirelessly connected to the electronic device  301  and configured to transmit/receive at least one of an electrical signal and power. 
     In one embodiment, the accessory device  350  may include the battery module  353  configured to charge the electronic device  301  with power when connected to the electronic device  301 . 
     In one embodiment, the accessory device  350  may include the memory module  354  configured to store data and the controller  352  configured to transmit data from the memory module  354  to the electronic device  301 . 
     In one embodiment, the accessory device  350  may include the input module  355  configured to transmit an input signal to the electronic device  301 . 
     In one embodiment, the accessory device  350  may include the output module  356  configured to receive an output signal from the electronic device  301  and output the output signal to the outside. 
     In one embodiment, the main body  351  may include the first body  351   a  coupled to the housings  310  and  320  and the second body  351   b  moving in the expansion direction and the retraction direction of the housings  310  and  320  from the first body  351   a.    
     In one embodiment, the mounting surface  390  may be provided at the first body  351   a  and the second body  351   b  and may expand or retract in interoperation with expansion and reduction of the main body  351  as the second body  351   b  moves. 
     In one embodiment, the accessory device  350  may include the expansion sensors  358   a  and  358   b  configured to sense the moving state of the second body  351   b  and the controller  352  configured to transmit the expansion state of the main body  351  to the electronic device  301  by receiving a sensing result from the expansion sensors  358   a  and  358   b.    
     In one embodiment, the electronic device  301  may include the first housing  310  and the second housing  320  where the first housing  310  is configured to move relative to the second housing  320  in the expansion direction and the retraction direction, the display module  361  supported by the first housing  310  and configured to expand and retract a screen display area in interoperation with movement of the first housing  310 , the auxiliary coupling unit  371  provided on a surface of the housings  310  and  320  in the expansion direction, and the accessory device  350  detachably attached to the housings  310  and  320  and configured to support the housings  310  and  320  when the housings  310  and  320  are in an expanded state, where the accessory device  350  may include the main body  351  including the mounting surface  390  configured to mount an expanded area of the first housing  310  and support the expanded area  361   b  of the display module  361 , and the coupling unit  370  configured to detachably couple the main body  351  to the housings  310  and  320 . 
     In one embodiment, the first housing  310  may include the bracket  375   b  provided on a surface facing the mounting surface  390 , and the coupling unit  370  may include the coupling groove  375   a  provided adjacent to the mounting surface  390  of the main body and including a shape corresponding to a shape of the bracket  375   b.    
     In one embodiment, the coupling unit  370  may include the first coupling unit  370   a  provided at one end contacting the second housing  320  in the main body  351  and coupled to the second housing  320 , and the second coupling unit  370   b  coupled to the first housing  310  in the main body  351  when the first housing  310  is in the expanded state. 
     In one embodiment, the accessory device  350  may include the connecting unit  380  configured to electrically connect the electronic device  301  to the accessory device  350 . 
     In one embodiment, the main body  351  may include the first body  351   a  coupled to the second housing  320 , and the second body  351   b  moving in the expansion direction and the retraction direction from the first body  351   a.    
     In one embodiment, an accessory device detachably attachable to an electronic device comprising a housing which is expandable to define an expanded area of the housing, and a display module which is expandable, together with the housing, to define an expanded area of the display module, and the accessory device may comprise a main body configured to be mounted to the expanded area of the housing, the main body comprising a mounting surface, and a coupling unit which detachably attaches the accessory device to the electronic device, wherein the main body which is attached to the housing which is expanded, may disposes the mounting surface to support the expanded area of the housing together with the expanded area of the display module. 
     In one embodiment, the coupling unit may comprise a magnetic body which is connected to the main body and electromagnetically interacts with the housing. In one embodiment, the accessory device which is attached to the electronic device may dispose the magnetic body to contact with the housing. 
     In one embodiment, the coupling unit may comprise a hook which is connected to the main body and is insertable into the housing. In one embodiment, the accessory device which is attached to the electronic device may dispose the hook to be inserted into the housing and to contact with the housing. 
     In one embodiment, the coupling unit may comprise a coupling groove which is provided in the main body with adjacent to the mounting surface and has a shape corresponding to a shape of the expanded area of the housing. In one embodiment, the accessory device which is attached to the electronic device may disposes the coupling groove of the main body coupling the expanded area of the housing. 
     In one embodiment, the coupling unit may comprise a first coupling unit connected to one end of the main body which is close to the housing, and a second coupling unit connected to the other end of the main body which is opposite to the one end. In one embodiment, the accessory device which is attached to the electronic device may dispose the first coupling unit to contact with a non-expanded area of the housing, and the second coupling unit to contact with the expanded area of the housing. 
     In one embodiment, an accessory device may further comprise a connecting unit configured to electrically connect the electronic device to the accessory device. 
     In one embodiment, the connecting unit may comprise a connecting terminal connected to the electronic device and configured to transmit or receive at least one of an electrical signal and power. 
     In one embodiment, the connecting unit may comprise a wireless connection module wirelessly connected to the electronic device and configured to transmit or receive at least one of an electrical signal and power. 
     In one embodiment, an accessory device may further comprise a battery module configured to provide power to the electronic device when the accessory device is connected to the electronic device. 
     In one embodiment, an accessory device may further comprise a memory module configured to store data and a controller configured to transmit the data from the memory module to the electronic device. 
     In one embodiment, an accessory device may further an input module configured to transmit an input signal to the electronic device. 
     In one embodiment, an accessory device may further an output module configured to receive an output signal from the electronic device and output the output signal to outside the accessory device. 
     In one embodiment, the housing of the electronic device may be expandable in an expansion direction and is retractable in a retraction direction. In one embodiment, the main body may comprise a first body detachably attached to the housing, and a second body moveable along the expansion direction or the retraction direction relative to the first body. 
     In one embodiment, the second body is expandable and retractable, together with expansion and retraction of the housing of the electronic device, and the mounting surface is provided at the first body and the second body and configured to expand or retract together with the second body. 
     In one embodiment, an accessory device may further an expansion sensor configured to sense a moving state of the second body, and a controller which is connected to the expansion sensor, configured to receive the moving state of the second body from the expansion sensor and transmit the moving state of the second body, to the electronic device. 
     In one embodiment, an electronic device may comprise a housing comprising a first housing which is moveable relative to a second housing, in an expansion direction away from the second housing to define an expanded area of the first housing and in a retraction direction toward the second housing, a display module connected to the housing, the display module extendable in the expansion direction to define an expanded area of the display module, and retractable in the retraction direction, together with the first housing, and an accessory device detachably attachable to the housing. In one embodiment, the accessory device may comprise a main body configured to be mounted to the expanded area of the housing, the main body comprising a mounting surface which is extended along the expansion direction, and a coupling unit which detachably attaches the main body to the housing. In one embodiment, the main body which is attached to the housing which is expanded, may disposes the mounting surface to support the expanded area of the display module together with the expanded area of the first housing. 
     In one embodiment, the first housing may comprise a bracket moveable along the expansion direction. In one embodiment, the coupling unit may comprise a coupling groove which is provided in the main body with adjacent to the mounting surface and has a shape corresponding to a shape of the bracket, and the accessory device which is attached to the housing and the display module which are expanded may disposes the bracket moved along the expansion direction, into the coupling groove and facing the mounting surface. 
     In one embodiment, the coupling unit may comprise a first coupling unit provided at one end of the main body which is close to the housing, and a second coupling unit provided at the other end of the main body which is opposite to the one end. In one embodiment, the accessory device which is attached to the electronic device and the display module which are expanded may disposes the first coupling unit coupled to the housing at the second housing, and the second coupling unit coupled to the housing at the expanded area of the first housing. 
     In one embodiment, the accessory device further may comprise a connecting unit configured to electrically connect the electronic device to the accessory device. 
     In one embodiment, the main body may comprise a first body detachably attached to the housing, and a second body moveable along the expansion direction and the retraction direction, relative to the first body. 
     Although the description is provided based on embodiments, present disclosure is not limited to the above shown and described embodiments. Various embodiments with modifications by one of ordinary skill in the art within the scope of the claims may be possible and the modified embodiments may be not separately construed from the technical idea or aspect.