Patent Publication Number: US-2023145126-A1

Title: Display control method and electronic device supporting same

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation application, claiming priority under § 365(c), of an International application No. PCT/KR2021/009114, filed on Jul. 15, 2021, which is based on and claims the benefit of a Korean patent application number 10-2020-0087670, filed on Jul. 15, 2020, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety. 
    
    
     BACKGROUND 
     1. Field 
     The disclosure relates to a display control method and an electronic device supporting the same. 
     2. Description of Related Art 
     A display serves as a core interface that provides explicit processes of recognition (e.g., input) and presentation (e.g., output) of information resources. A recent electronic device is equipped with a full screen display that provides an extended screen in order to promote an advanced interaction between the display and a user. 
     The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure. 
     SUMMARY 
     Implementation of a full screen display may require improvement of hardware or software in an electronic device. For example, an optical sensor (e.g., an image sensor, a fingerprint sensor, or an illuminance sensor) disposed on a front surface of the electronic device or exposed through the front surface may be disposed under a display so as not to restrict the screen expansion of the display. In this case, the display area corresponding to a disposition region of the optical sensor may include a non-pixel region where some pixels are removed to support optical functions of the optical sensor. 
     However, the display area corresponding to the disposition region of the optical sensor may be viewed differently from other display areas because of a reduction in resolution or brightness due to the non-pixel region, which may reduce quality of the display. 
     Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide a display control method capable of improving the difference in visibility of a display including a non-pixel region, and an electronic device supporting the same. 
     Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments. 
     In accordance with an aspect of the disclosure, an electronic device is provided. The electronic device includes a display, an optical sensor disposed under the display, and at least one processor electrically connected to the display and the optical sensor. 
     According to an embodiment, the display includes a first region having a first pixel density and a second region having a second pixel density, which is less than the first pixel density, and corresponding to a disposition region of the optical sensor. 
     According to an embodiment, the at least one processor identifies a first brightness level for the first region, if the first brightness level exceeds a specified threshold, determine a second brightness level for the second region, based on at least one of the first brightness level, the first pixel density, and the second pixel density, identify a third region of the display defined to include the second region along an edge of the first region, and configure the brightness of the second region and the third region as the second brightness level. 
     An electronic device according to an embodiment includes a display, an optical sensor disposed under the display, and a display driver integrated circuit electrically connected to the display. 
     According to an embodiment, the display includes a first region having a first pixel density and a second region having a second pixel density, which is less than the first pixel density, and corresponding to a disposition region of the optical sensor. 
     According to an embodiment, the display driver integrated circuit identifies a first brightness level for the first region, if the first brightness level exceeds a specified threshold, determine a second brightness level for the second region, based on at least one of the first brightness level, the first pixel density, and the second pixel density, identify a third region of the display defined to include the second region along an edge of the first region, and configure the brightness of the second region and the third region as the second brightness level. 
     In accordance with another aspect of the disclosure, a display control method of an electronic device is provided. The method includes a display including a first region having a first pixel density and a second region having a second pixel density less than the first pixel density may include identifying a first brightness level for the first region, identifying that the first brightness level exceeds a specified threshold, determining a second brightness level for the second region, based on at least one of the first brightness level, the first pixel density, and the second pixel density, identifying a third region of the display defined to include the second region along an edge of the first region, and configuring the brightness of the second region and the third region as the second brightness level, wherein the electronic device may include an optical sensor disposed under the second region. 
     According to various embodiments, it is possible to improve a difference in visibility of a display, which is causes by a reduction in resolution or brightness of a non-pixel region, based on partial brightness level control of the display. 
     Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
         FIG.  1    is a diagram illustrating an electronic device in a network environment according to an embodiment of the disclosure; 
         FIG.  2    is a diagram illustrating a display device according to an embodiment of the disclosure; 
         FIG.  3    is a diagram illustrating a first region and a second region of a display device according to an embodiment of the disclosure; 
         FIG.  4    is a diagram illustrating a method of controlling a display device according to an embodiment of the disclosure; 
         FIG.  5    is a diagram illustrating a brightness level relationship between a first region and a second region of a display device according to an embodiment of the disclosure; 
         FIG.  6    is a diagram illustrating a third region of a display device according to an embodiment of the disclosure; 
         FIG.  7    is a diagram illustrating a graphic effect applied to a third region of a display device according to an embodiment of the disclosure; 
         FIGS.  8 A and  8 B  are diagrams illustrating a third region based on context of a display device according to various embodiments of the disclosure; 
         FIG.  9    is a diagram illustrating a method of controlling a display device according to an embodiment of the disclosure; 
         FIG.  10    is a diagram illustrating a third region of a display device according to an embodiment of the disclosure; 
         FIG.  11    is a diagram illustrating a third region of a display device according to an embodiment of the disclosure; 
         FIG.  12    is a diagram illustrating an example of determining the intensity of a graphic effect applied to a third region of a display device according to an embodiment of the disclosure; 
         FIG.  13 A  is a diagram illustrating a front surface of an electronic device according to an embodiment of the disclosure; 
         FIG.  13 B  is a diagram illustrating a rear surface of an electronic device according to an embodiment of the disclosure; 
         FIG.  14    is an exploded view illustrating an electronic device according to an embodiment of the disclosure; 
         FIG.  15 A  is a diagram illustrating an unfolded state of an electronic device according to an embodiment of the disclosure; 
         FIG.  15 B  is a diagram illustrating a folded state of an electronic device according to an embodiment of the disclosure; 
         FIG.  16    is an exploded view illustrating an electronic device according to an embodiment of the disclosure; 
         FIG.  17 A  is a cross-sectional view of an electronic device viewed in one direction according to an embodiment of the disclosure; 
         FIG.  17 B  is an enlarged view of an area of an electronic device according to an embodiment of the disclosure; 
         FIG.  17 C  is an enlarged view of another area of an electronic device according to an embodiment of the disclosure; 
         FIG.  18 A  is a diagram illustrating a closed state of an electronic device according to an embodiment of the disclosure; 
         FIG.  18 B  is a diagram illustrating an open state of an electronic device according to an embodiment of the disclosure; 
         FIG.  18 C  is an exploded view of an electronic device according to an embodiment of the disclosure; and 
         FIGS.  19 A and  19 B  are diagrams illustrating various regions of a display device when the electronic device switches from a closed state to an open state according to various embodiments of the disclosure. 
     
    
    
     Throughout the drawings, like reference numerals will be understood to refer to like parts, components, and structures. 
     DETAILED DESCRIPTION 
     The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness. 
     The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the disclosure is provided for illustration purpose only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents. 
     It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
       FIG.  1    is a diagram illustrating an electronic device in a network environment according to an embodiment of the disclosure. 
     Referring to  FIG.  1   , an electronic device  101  in a network environment  100  may communicate with an electronic device  102  via a first network  198  (e.g., a short-range wireless communication network), or an electronic device  104  or a server  108  via a second network  199  (e.g., a long-range wireless communication network). According to an embodiment, the electronic device  101  may communicate with the electronic device  104  via the server  108 . According to another embodiment, the electronic device  101  may include a processor  120 , memory  130 , an input device  150 , a sound output device  155 , a display device  160 , an audio module  170 , a sensor module  176 , an interface  177 , 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 embodiments, at least one (e.g., the display device  160  or the camera module  180 ) of the components may be omitted from the electronic device  101 , or one or more other components may be added in the electronic device  101 . In other embodiments, some of the components may be implemented as single integrated circuitry. For example, the sensor module  176  (e.g., a fingerprint sensor, an iris sensor, or an illuminance sensor) may be implemented as embedded in the display device  160  (e.g., a display). 
     The processor  120  may be configured to 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  coupled with the processor  120 , and may perform various data processing or computation. In one embodiment, as at least part of the data processing or computation, the processor  120  may load a command or data received from another component (e.g., the sensor module  176  or the communication module  190 ) in volatile memory  132 , process the command or the data stored in the volatile memory  132 , and store resulting data in non-volatile memory  134 . In another embodiment, the processor  120  may include a main processor  121  (e.g., a central processing unit (CPU) or an application processor (AP)), and an auxiliary processor  123  (e.g., a graphics processing unit (GPU), 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 . Additionally or alternatively, 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 as separate from, or as part of the main processor  121 . 
     The auxiliary processor  123  may control at least some of functions or states related to at least one component (e.g., the display device  160 , the sensor module  176 , or the communication module  190 ) among 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 together with the main processor  121  while the main processor  121  is in an active state (e.g., executing an application). In an embodiment, the auxiliary processor  123  (e.g., an image signal processor or a communication processor) may be implemented as part of another component (e.g., the camera module  180  or the communication module  190 ) functionally related to the auxiliary processor  123 . 
     The memory  130  may be configured to 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 program  140  may be stored in the memory  130  as software, and may include, for example, an operating system (OS)  142 , middleware  144 , or an application  146 . 
     The input device  150  may receive a command or data to be used by other 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 device  150  may include, for example, a microphone, a mouse, a keyboard, a digital pen (e.g., a stylus pen), and the like. 
     The sound output device  155  may output sound signals to the outside of the electronic device  101 . The sound output device  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, and the receiver may be used for incoming calls. According to an embodiment, the receiver may be implemented as separate from, or as part of the speaker. 
     The display device  160  may be configured to visually provide information to the outside (e.g., a user) of the electronic device  101 . The display device  160  may include, for example, a display, a hologram device, or a projector and control circuitry to control a corresponding one of the display, hologram device, and projector. In an embodiment, the display device  160  may include touch circuitry adapted to detect a touch, or sensor circuitry (e.g., a pressure sensor) adapted to measure the intensity of force incurred by the touch. 
     The audio module  170  may convert a sound into an electrical signal and vice versa. In another 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 a headphone of an external electronic device (e.g., an electronic device  102 ) directly (e.g., wiredly) or wirelessly coupled with 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 then generate an electrical signal or data value corresponding to the detected state. According to an 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, an illuminance sensor, and the like. 
     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. In an 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. 
     A connecting terminal  178  may include a connector via which the electronic device  101  may be physically connected with the external electronic device (e.g., the electronic device  102 ). According to an embodiment, the connecting terminal  178  may include, for example, a HDMI connector, a USB connector, a SD card connector, or an audio connector (e.g., a headphone connector). 
     The haptic module  179  may convert an electrical signal into a mechanical stimulus (e.g., a vibration or a movement) or electrical stimulus which may be recognized by a user via his tactile sensation or kinesthetic sensation. In an 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 or moving images. According to an embodiment, the camera module  180  may include one or more lenses, image sensors, image signal processors, or flashes. 
     The power management module  188  may manage power supplied to the electronic device  101 . In one embodiment, the power management module  188  may be implemented as at least part of, for example, 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 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 be configured to 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 from the processor  120  (e.g., the application processor (AP)) and supports a direct (e.g., wired) communication or a wireless communication. According to an 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 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 cellular network, the Internet, or a computer network (e.g., LAN or 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 subscriber identification module  196 . 
     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 embodiment, the antenna module  197  may include an antenna including a radiating element composed of a conductive material or a conductive pattern formed in or on a substrate (e.g., PCB). According to another embodiment, the antenna module  197  may include a plurality of antennas. In such a case, at least one antenna appropriate for a communication scheme used in the communication network, such as the first network  198  or the second network  199 , may be selected, for example, by the communication module  190  (e.g., the wireless communication module  192 ) from the plurality of antennas. The signal or the power may then be transmitted or received between the communication module  190  and the external electronic device via the selected at least one antenna. According to yet another embodiment, another component (e.g., a radio frequency integrated circuit (RFIC)) other than the radiating element may be additionally formed as part of the antenna module  197 . 
     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)). 
     In an 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 electronic devices  102  and  104  may be a device of a same type as, or a different type, from the electronic device  101 . In another embodiment, all or some of operations to be executed at the electronic device  101  may be executed at one or more of the external electronic devices  102 ,  104 , or  108 . For example, if the electronic device  101  should 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 the 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 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, or client-server computing technology may be used, for example. 
       FIG.  2    is a diagram illustrating a display device according to an embodiment of the disclosure. 
     Referring to  FIGS.  1  and  2   , a display device  160  may include a display  210  and a display driver integrated circuit (DDI)  230  to control the display  210 . The DDI  230  may include an interface module  231 , memory  233  (e.g., buffer memory), an image processing module  235 , or a mapping module  237 . The DDI  230  may receive image information that contains image data or an image control signal corresponding to a command to control the image data from another component of the electronic device  101  via the interface module  231 . According to an embodiment, the image information may be received from the processor  120  (e.g., the main processor  121  (e.g., an application processor)) or the auxiliary processor  123  (e.g., a graphics processing unit) operated independently from the function of the main processor  121 . The DDI  230  may communicate, for example, with touch circuitry  150  or the sensor module  176  via the interface module  231 . The DDI  230  may also store at least part of the received image information in the memory  233 , for example, on a frame by frame basis. The image processing module  235  may perform pre-processing or post-processing (e.g., adjustment of resolution, brightness, or size) with respect to at least part of the image data. In an embodiment, the pre-processing or post-processing may be performed, for example, based at least in part on one or more characteristics of the image data or one or more characteristics of the display  210 . The mapping module  237  may generate a voltage value or a current value corresponding to the image data pre-processed or post-processed by the image processing module  235 . In another embodiment, the generating of the voltage value or current value may be performed, for example, based at least in part on one or more attributes of the pixels (e.g., an array, such as an red, green, and blue (RGB) stripe or a pentile structure, of the pixels, or the size of each subpixel). At least some pixels of the display  210  may be driven, for example, based at least in part on the voltage value or the current value such that visual information (e.g., a text, an image, or an icon) corresponding to the image data may be displayed via the display  210 . 
     In yet another embodiment, the display device  160  may further include the touch circuitry  250 . The touch circuitry  250  may include a touch sensor  251  and a touch sensor IC  253  to control the touch sensor  251 . The touch sensor IC  253  may control the touch sensor  251  to sense a touch input or a hovering input with respect to a certain position on the display  210 . To achieve this, for example, the touch sensor  251  may detect (e.g., measure) a change in a signal (e.g., a voltage, a quantity of light, a resistance, or a quantity of one or more electric charges) corresponding to the certain position on the display  210 . In still another embodiment, the touch circuitry  250  may provide input information (e.g., a position, an area, a pressure, or a time) indicative of the touch input or the hovering input detected via the touch sensor  251  to the processor  120 . According to an embodiment, at least part (e.g., the touch sensor IC  253 ) of the touch circuitry  250  may be formed as part of the display  210  or the DDI  230 , or as part of another component (e.g., the auxiliary processor  123 ) disposed outside the display device  160 . 
     The display device  160  may further include at least one sensor (e.g., a fingerprint sensor, an iris sensor, a pressure sensor, or an illuminance sensor) of the sensor module  176  or a control circuit for the at least one sensor. In such a case, the at least one sensor or the control circuit for the at least one sensor may be embedded in one portion of a component (e.g., the display  210 , the DDI  230 , or the touch circuitry  150 )) of the display device  160 . For example, when the sensor module  176  embedded in the display device  160  includes a biometric sensor (e.g., a fingerprint sensor), the biometric sensor may obtain biometric information (e.g., a fingerprint image) corresponding to a touch input received via a portion of the display  210 . As another example, when the sensor module  176  embedded in the display device  160  includes a pressure sensor, the pressure sensor may obtain pressure information corresponding to a touch input received via a partial or whole area of the display  210 . In an embodiment, the touch sensor  251  or the sensor module  176  may be disposed between pixels in a pixel layer of the display  210 , or over or under the pixel layer. 
       FIG.  3    is a diagram illustrating a first region and a second region of a display device according to an embodiment of the disclosure. 
     Referring to  FIG.  3   , a display device  160  (e.g., the display ( 210  in  FIG.  2   ) of the display device  160 , hereinafter referred to as a display  210 ) of an electronic device  101  according to an embodiment may include a first region  161  and at least one second region  163 . In an embodiment, the at least one second region  163  may be formed in various regions of the display  210  according to implementation thereof. The at least one second region  163  may be formed in an upper right region or an upper left region adjacent to an upper edge of the display  210 . As an example, the at least one second region  163  may be formed in a region that a user&#39;s body (e.g., thumb) may easily access when the user holds the electronic device  101 , and for example, the at least one second region  163  may be formed in a lower central region adjacent to a lower edge of the display  210 . In an embodiment, the first region  161  may be formed to occupy the remaining area of the display  210 , excluding the at least one second region  163 . 
     In another embodiment, at least one optical sensor may be disposed under the display  210  to correspond to the at least one second region  163 . The at least one optical sensor may be disposed under the display  210  so as to be vertically aligned with the at least one second region  163 . In yet another embodiment, the at least one optical sensor may include at least one of an image sensor supporting capturing images of a peripheral area of the electronic device  101  (e.g., the front of the electronic device  101 ), an illuminance sensor for detecting the state (e.g., the amount of light) around the electronic device  101 , and a biometric sensor for supporting acquisition of biometric information (e.g., fingerprint information or iris information) of a user of the electronic device  101 . According to various embodiments, the area or shape of the at least one second region  163  may be variously determined depending on the size, shape, or sensing coverage of the at least one optical sensor. 
     In still another embodiment, each of the first region  161  and at least one second region  163  may include a plurality of pixels, and each of the plurality of pixels may include a plurality of sub-pixels. For example, one pixel may include an RGB stripe structure configured as a combination of a red sub-pixel, a green sub-pixel, and a blue sub-pixel, which are arranged on the same line, or an red, green, blue and white (RGBW) stripe structure configured as a combination of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, which are arranged on the same line. In another example, one pixel may include an RGBG diamond Pentile structure configured as a combination of a red sub-pixel having a first size, a blue sub-pixel having a second size greater than the first size, and a plurality of green sub-pixels having a third size smaller than the first size. According to various embodiments, the areas, sizes, or shapes of the plurality of sub-pixels included in each of the plurality of pixels may be the same or different from each other. In addition, the separation distances or arrangements between the plurality of sub-pixels included in each of the plurality of pixels may be the same or different from each other. 
     In yet another embodiment, the at least one second region  163  may include a pixel structure that is different from the first region  161  in order to support an optical function of the optical sensor disposed to correspond to the at least one second region  163 , as well as to display content corresponding to image information. The first region  161  may include a plurality of first pixel regions  161   a  where pixels are disposed, and the at least one second region  163  may include a plurality of second pixel regions  163   a  where pixels are disposed and a plurality of non-pixel regions  163   b  where no pixels are disposed. The first region  161  and the at least one second region  163  may support display of content on the entire area of the display  210 , based on the plurality of first pixel regions  161   a  and the plurality of second pixel regions  163   a , and the at least one second region  163  may implement light transmission through the display  210  based on the plurality of non-pixel regions  163   b , thereby supporting light to enter the optical sensor from the outside or light to exit from the optical sensor to the outside. 
     In an embodiment, a display layer structure (or stacked structure) may differ between the first region  161  and the at least one second region  163 . For example, an opaque layer (e.g.,  2060  in  FIG.  17 C  to be described later) may be disposed on the rear surface of a display panel corresponding to the at least one second region  163 , and the opaque layer may be excluded from the rear surface of a display panel corresponding to the first region  161 . In another embodiment, the first region  161  and the at least one second region  163  may have the same display layer structure (or stacked structure). In another example, the opaque layer may be equally disposed on the rear surfaces of the display panel corresponding to the first region  161  and the at least one second region  163 , respectively, or the opaque layer may be excluded therefrom. 
     According to various embodiments, the plurality of second pixel regions  163   a  and the plurality of non-pixel regions  163   b  included in the at least one second region  163  may be arranged in a regular or irregular sequence. According to other embodiments, electrical wires or circuits (e.g., thin film transistors (TFTs)) related to driving of pixels may be disposed in the same or different arrangements in the plurality of second pixel regions  163   a . According to still other embodiments, the area of each of the plurality of second pixel regions  163   a  may be the same as or different from the area of each of the plurality of non-pixel regions  163   b . According to yet other embodiments, the total area of the plurality of second pixel regions  163   a  may be the same as or different from the total area of the plurality of non-pixel regions  163   b.    
     According to an embodiment, the pixel density may be different between the first region  161  and the at least one second region  163  due to the plurality of non-pixel regions  163   b . For example, the first region  161  may include a plurality of first pixel regions  161   a  in which pixels are disposed based on a first pixel density, and the at least one second region  163  may include a plurality of second pixel regions  163   a  in which pixels are disposed based on a second pixel density less than the first pixel density. When the first region  161  has a first pixel density of 100%, the at least one second region  163  may include a non-pixel density of 25%, 50%, or 75%, thereby having a second pixel density of 75%, 50%, or 25%, which is less than the first pixel density. According to another embodiment, based on the first pixel density and the second pixel density different from each other, the number of pixels per unit area included in the at least one second region  163  may be smaller than the number of pixels per unit area included in the first region  161 . 
     Various functional operations of the electronic device  101  described below with reference to the drawings may be performed under direct or indirect control of a processor (e.g.,  120  in  FIG.  1   ) or a display driver integrated circuit (e.g.,  230  in  FIG.  2   ) that is electrically connected to the display device  160  (or the display  210  of the display device  160 ) of the electronic device  101 . Hereinafter, examples of functional operations of the electronic device  101  under the control of the processor  120  will be described. 
       FIG.  4    is a diagram illustrating a method of controlling a display device according to an embodiment of the disclosure,  FIG.  5    is a diagram illustrating a brightness level relationship between a first region and a second region of a display device according to an embodiment of the disclosure, and  FIG.  6    is a diagram illustrating a third region of a display device according to an embodiment of the disclosure. 
     Referring to  FIGS.  4  and  6   , in operation  401 , a processor (e.g.,  120  in  FIG.  1   ) of an electronic device  101  may identify a first brightness level in the first region  161  of a display device  160  (e.g., the display ( 210  in  FIG.  2   ) of the display device  160 , hereinafter referred to as a display  210 ). The processor  120  may identify a first brightness level in the first region  161  of a display device  160  while displaying an arbitrary screen (e.g., a lock screen, a home screen, or an execution screen of an application) through the display  210 . The processor  120  may identify the first brightness level of the first region  161  within a specified time range from displaying the arbitrary screen. 
     In operation  403 , the processor  120  may determine whether or not the identified first brightness level of the first region  161  exceeds a specified threshold. According to an embodiment, the processor  120  may configure a maximum brightness level capable of being covered by at least one second region  163  of the display  210  (or capable of maximally brightening the second region  163 ) as the specified threshold. In this regard, referring to  FIGS.  5  and  6   , since at least one second region  163  may have a second pixel density less than a first pixel density of the first region  161  (or may have a plurality of non-pixel regions ( 163   b  in  FIG.  3   ) from which pixels have been removed), the at least one second region  163  may have a maximum brightness level  510  lower than the maximum brightness level of the first region  161  by a specific ratio. For example, assuming that at least one second region  163  has a second pixel density of 25% compared to a first pixel density of 100% in the first region  161 , the at least one second region  163  may have a maximum brightness level  510  corresponding to a ratio of 25% to the maximum brightness level of the first region  161  on the condition that the same driving power is supplied to a plurality of first pixel regions (e.g.,  161   a  in  FIG.  3   ) included in the first region  161  and a plurality of second pixel regions (e.g.,  163   a  in  FIG.  3   ) included the at least one second region  163 . In another example, in the case where at least one second region  163  has a second pixel density of 50% compared to a first pixel density of 100% in the first region  161 , the at least one second region  163  may have a maximum brightness level corresponding to a ratio of 50% to the maximum brightness level of the first region  161  on the condition that the same driving power is supplied to a plurality of first pixel regions  161   a  included in the first region  161  and a plurality of second pixel regions  163   a  included the at least one second region  163 . 
     Based on the above description, at least one second region  163  may be controlled to have a brightness level the same as or similar to a brightness level of the first region  161  when the brightness level of the first region  161  is less than or equal to the maximum brightness level of the at least one second region  163 . Alternatively, if the brightness level of the first region  161  exceeds the maximum brightness level of the at least one second region  163 , the at least one second region  163  may have a brightness level lower than the brightness level of the first region  161  even it is controlled to have a maximum brightness level that may be covered. 
     In an embodiment, if it is determined that the first brightness level of the first region  161  exceeds a specified threshold in operation  403 , the processor  120  may determine a second brightness level of at least one second region  163 , which is to be controlled, in operation  405 . The processor  120  may determine the second brightness level of at least one second region  163 , based on at least one of a first brightness level of the first region  161 , a first pixel density of the first region  161 , a second pixel density of at least one second region  163 , and deterioration that may possibly occur in at least one second region  163 . In another embodiment, if the first brightness level of the first region  161  exceeds the specified threshold by a specified level range or more, the processor  120  may determine a maximum brightness level capable of being covered by at least one second region  163  as the second brightness level such that the at least one second region  163  has a brightness level as similar as possible to the first brightness level of the first region  161 . Alternatively, if the first brightness level of the first region  161  exceeds the specified threshold by less than the specified level range, the processor  120  may determine a brightness level lowered by a specified level from the maximum brightness level of at least one second region  163  as the second brightness level in order to prevent degradation (e.g., burn-in) that may occur when the at least one second region  163  consistently has the maximum brightness level. According to various embodiments, if the first brightness level of the first region  161  exceeds the specified threshold without determining the specified level range, the processor  120  may determine any one of the maximum brightness level capable of being covered by at least one second region  163  and the brightness level lowered by a specified level from the maximum brightness level as the second brightness level of the at least one second region  163 . 
     In operation  407 , the processor  120  may identify a third region  165  of the display  210 . According to an embodiment, the processor  120  may determine a third region  165  defined to include a partial region of the first region  161  and at least one second region  163 . For example, the processor  120  may determine an edge region of the first region  161  as the third region  165 , and in this operation, a region that extends from the edge of the display  210  to have a width covering at least one second region  163 , formed adjacent to the edge, may be determined as the edge region of the first region  161 . The processor  120  may determine a region defined to have a width capable of including the at least one second region  163  along the edge of the first region  161 , based on the edge of the display  210 , as the third region  165 . 
     According to various embodiments, the processor  120  may dynamically determine the third region  165 , based on the position of at least one second region  163 . For example, in the case where the at least one second region  163  is formed in an upper right region or an upper left region adjacent to the upper edge of the display  210 , the processor  120  may determine an upper edge region of the first region  161  as the third region  165 . In the case where the at least one second region  163  is formed in the lower central region adjacent to the lower edge of the display  210 , the processor  120  may determine a lower edge region of the first region  161  as the third region  165 . As another example, in the case where the at least one second region  163  is formed in a region adjacent to the upper edge or the lower edge of the display  210 , the processor  120  may determine both an upper edge region and a lower edge region of the first region  161  as the third region  165 . The width of the third region  165  corresponding to the upper edge region of the first region  161  and the width of the third region  165  corresponding to the lower edge region of the first region  161  may be the same or different from each other. As yet another example, in the case where the at least one second region  163  is formed in a region adjacent to at least one of the upper edge and the lower edge of the display  210 , the processor  120  may determine all edge regions of the first region  161 , surrounding the central region of the first region  161  (or the central region of the display  210 ), as the third region  165  without separately dividing the edge regions of the first region  161 . 
     According to various embodiments, the processor  120  may dynamically determine a third region  165  of a foldable electronic device (e.g., the electronic device  1800  to be described later in  FIG.  15 A ). Although the electronic device  1800  according to the embodiment in  FIG.  15 A  is illustrated as including a sensor area (e.g.,  1524  in  FIG.  15 A ) that does not overlap the display (e.g.,  1600  in  FIG.  15 A ), according to various embodiments, the sensor area  1524  may be formed in the screen area of the display  1600  (or in the lower area of the display  1600  overlapping the display  1600 ), similarly to the at least one second region  163  described above. A first region  161  having a large area and having a symmetrical shape with respect to the folded area (e.g., the folding area  1603  in  FIG.  15 A ) may be formed in an unfolded state of the electronic device  1800 , and the processor  120  may determine at least one of the upper edge region, the left edge region, the right edge region, and the lower edge region of the first region  161  as the third region  165 , based on the position of the sensor area  1524  formed adjacent to at least one of the upper edge and the lower edge of the display  1600 . 
     In operation  409 , the processor  120  may configure the second brightness level determined by performing operation  405  as the brightness level of at least one second region  163  and the third region  165 . Referring to the above description in this regard, as the first brightness level of the first region  161  exceeds a specified threshold corresponding to the maximum brightness level of at least one second region  163 , the at least one second region  163  may have a brightness level lower than the first brightness level of the first region  161  even if it is controlled to have the maximum brightness level (or even if the maximum driving power is supplied). The at least one second region  163  having a lower brightness level than the first region  161  may be viewed differently from the first region  161 . The processor  120  may configure the at least one second region  163  and the third region  165  corresponding to the edge region of the first region  161  to have the same second brightness level, thereby improving the issue in which the at least one second region  163  is viewed as a different spot. Additionally or alternatively, the processor  120  may configure the at least one second region  163  and the third region  165  to have the same second brightness level and apply a graphic effect having relationship with the first region  161  to the third region  165  in order to further improve the visibility issue due to a difference between the second brightness level of the at least one second region  163  and the third region  165  and the first brightness level of the first region  161 . The graphic effect will be described with reference to  FIG.  7    later. 
     In an embodiment, the processor  120  may control the supply of driving power to at least one second region  163  and the third region  165 , thereby configuring the at least one second region  163  and the third region  165  to have the same second brightness level. In this operation, the processor  120  may perform control such that first driving power supplied to the at least one second region  163  is different from second driving power supplied to the third region  165 . For example, as the third region  165  has a first pixel density equal to that of the first region  161  and at least one second region  163  has a second pixel density less than the first pixel density, the processor  120  may control a power management module (e.g.,  188  in  FIG.  1   ) or a battery (e.g.,  189  in  FIG.  1   ) to supply the second driving power, which is less than the first driving power supplied to the at least one second region  163 , to the third region  165 . For example, it may be assumed that at least one second region  163  has a second pixel density of 25% compared to a first pixel density of 100% of the first region  161 . In addition, as the first brightness level of the first region  161  exceeds a specified threshold, it may be assumed that the maximum brightness level capable of being covered by the at least one second region  163  is determined as the second brightness level to be controlled for the at least one second region  163 . The processor  120  may perform control such that first driving power of 100% is supplied to the at least one second region  163  in order to configure the at least one second region  163  to have the second brightness level corresponding to the maximum brightness level, and perform control such that second driving power of 25% corresponding to 25% of the first driving power of 100% is supplied to the third region  165 . 
     According to various embodiments, the processor  120  may dynamically determine the second brightness level for at least one second region  163  and the third region  165  in a foldable electronic device (e.g., the electronic device  1800  in  FIG.  15 A ). For example, the processor  120  may obtain information about the degree of folding (e.g., a folding angle) in an unfolded state of the electronic device  1800 , and if the information about the degree of folding falls within a first angle range in which at least one second region  163  is not visible to the user&#39;s eyes substantially aligned with the electronic device  1800 , may not configure the second brightness level for the at least one second region  163  and the third region  165 . In another example, if the information about the degree of folding falls within a second angle range, excluding the first angle range from the entire folding angle range supported by the electronic device  1800 , the processor  120  may configure the brightness levels of the at least one second region  163  and the third region  165  as the second brightness level. 
     If it is determined in operation  403  that the first brightness level of the first region  161  does not exceed the specified threshold, the processor  120  may determine a third brightness level to be controlled for the at least one second region  163  in operation  411 . In an embodiment, the processor  120  may determine the third brightness level for the at least one second region  163 , based on at least one of the first brightness level of the first region  161 , the first pixel density of the first region  161 , and the second pixel density of the at least one second region  163 . For example, as the first brightness level of the first region  161  does not exceed the maximum brightness level (e.g., a specified threshold) capable of being covered by at least one second region  163 , the processor  120  may determine the third brightness level to be controlled for the at least one second region  163  to be the same brightness level as the first brightness level of the first region  161 . In another example, the processor  120  may determine the third brightness level to be controlled for at least one second region  163  to be a brightness level that is substantially similar to the first brightness level of the first region  161  but lower than the first brightness level. The brightness level lower than the first brightness level may be determined as a level at which the user is unable to recognize a difference between the first brightness level and the brightness level lower than the first brightness level. Alternatively, the processor  120  may visually provide information about candidates of brightness levels lowered from the first brightness level on stages at the time at which it is determined that the first brightness level of the first region  161  does not exceed a specified threshold and determine a brightness level selected by a user input as the third brightness level to be controlled for at least one second region  163 . 
     In operation  413 , the processor  120  may configure the brightness level of the at least one second region  163  as the third brightness level determined by performing operation  411 . At least one second region  163  and the first region  161  may be configured to have the same or substantially similar brightness levels, thereby improving the issue in which the at least one second region  163  having the second pixel density less than the first pixel density of the first region  161  is viewed as a different spot from the first region  161 . 
     According to various embodiments, the above-described operations  401  to  413  may be performed under the control of a display driver integrated circuit (e.g.,  230  in  FIG.  2   ) capable of operating independently of the processor  120 . For example, when the processor  120  (or the electronic device  101 ) is in a low power state, sleep state, or standby state, the display driver integrated circuit  230  may control the display  210  to display an always-on-display (AOD) screen (or AOD content) and, based on the first brightness level of the first region  161  identified by performing operation  401  while displaying the AOD screen, perform operations subsequent to operation  401 . 
       FIG.  7    is a diagram illustrating a graphic effect applied to a third region of a display device according to an embodiment of the disclosure. 
     Referring to  FIG.  7   , a processor (e.g.,  120  in  FIG.  1   ) of an electronic device  101  may configure a third region  165  of a display device  160  (e.g., a display ( 210  in  FIG.  2   ) of the display device  160 , hereinafter referred to as a display  210 ) to have the second brightness level (see operation  409  in  FIG.  4   ) and then apply a specified graphic effect to the third region  165 . In an embodiment, a processor  120  may apply a gradation effect to the third region  165  as at least a part of the specified graphic effect. The processor  120  may apply a gradation effect that gradually changes from a portion of the third region  165  adjacent to the edge of the display  210  to another portion of the third region  165  adjacent to the boundary  167  between the third region  165  and the first region  161 . In an embodiment, the processor  120  may control an alpha value of the display  210  for the third region  165 , thereby applying a gradation effect in which the transparency of the third region  165  gradually changes between a value of 0.0 and a value of 1.0. In another embodiment, the processor  120  may apply a gradation effect in which a color gradually changes to the third region  165 , and in this regard, obtain color information to be reflected in the gradation effect. For example, based on the screen displayed on the display  210  (see operation  401  in  FIG.  4   ), the processor  120  may identify first color that is dominant in a part of the third region  165  adjacent to the edge of the display  210  and a second color dominant in another part of the third region  165  adjacent to the boundary  167 , and apply a gradation effect of changing from the first color to the second color to the third region  165 . Alternatively, the processor  120  may identify a color-on pixel ratio (C-OPR) (e.g., an average value of grayscales for at least one pixel in an on state (or in a state in which driving power is supplied)) of the first region  161 , excluding the third region  165 , and apply, to the third region  165 , a gradation effect of changing between a third color corresponding to the C-OPR and at least one fourth color in the same group as the third color. 
       FIGS.  8 A and  8 B  are diagrams illustrating a third region based on context of a display device according to various embodiments of the disclosure. 
     Referring to  FIGS.  8 A and  8 B , a processor (e.g.,  120  in  FIG.  1   ) of an electronic device  101  may determine a width of a third region  165  in an operation (see operation  407  in  FIG.  4   ) of identifying the third region  165  of a display device  160  (e.g., a display ( 210  in  FIG.  2   ) of the display device  160 , hereinafter referred to as a display  210 ). For example, if the first brightness level of the first region  161  exceeds a specified threshold (e.g., the maximum brightness level capable of being covered by least one second region  163 ) by less than a specified level range (context a), the processor  120  may determine a region extending from the edge of the display  210  to have a first width w 1 , which may cover at least one second region  163  formed adjacent to the edge, as a third region  165  corresponding to the edge region of the first region  161 . In another example, if the first brightness level of the first region  161  exceeds the specified threshold by the specified level range or more (context b), the processor  120  may determine a region extending from the edge of the display  210  to have a second width w 2 , which is greater than the first width w 1 , as a third region  165  corresponding to the edge region of the first region  161 . Since a wide gradation effect may be applied to the third region  165  having the second width w 2 , it is possible to improve the visibility issue due to a relatively big difference between the second brightness level of at least one second region  163  and the third region  165  and the first brightness level of the first region  161 . 
     According to various embodiments, the processor  120  may determine the width of the third region  165  depending on a change in the posture of the electronic device  101 . The processor  120  may determine the width of the third region  165  corresponding to the upper edge region of the first region  161  to be different from the width of the third region  165  corresponding to the lower edge region of the first region  161  in a portrait posture of the electronic device  101  and thereafter, if it is determined that the portrait posture switches to a landscape posture, determine the width of the third region  165  corresponding to the left edge region of the first region  161  in the landscape posture (e.g., the upper edge region of the first region  161  in the portrait posture) to be the same as the width of the third region  165  corresponding to the right edge region of the first region  161  (e.g., the lower edge region of the first region  161  in the portrait posture). Conversely, even when the electronic device  101  switches from the landscape posture to the portrait posture, the width of the third region  165  may be determined in the same or similar manner as the above description. The processor  120  may determine the width of the third region  165  corresponding to the left edge region of the first region  161  to be the same as the width of the third region  165  corresponding to the right edge region of the first region  161  in the landscape posture of the electronic device  101  and thereafter, if the electronic device  101  switches from landscape posture to the portrait posture, determine the width of the third region  165  corresponding to the upper edge region of the first region  161  (e.g., the left edge region of the first region  161  in the landscape posture) to be different from the width of the third region  165  corresponding to the lower edge region of the first region  161  (e.g., the right edge region of the first region  161  in the landscape posture). 
       FIG.  9    is a diagram illustrating a method of controlling a display device according to an embodiment of the disclosure, and  FIG.  10    is a diagram illustrating a third region of a display device according to an embodiment of the disclosure. 
     Various operations of an electronic device described with reference to  FIG.  9  or  10    may be sequentially performed subsequent to operation  401  and operation  403  described above with reference to  FIG.  4   . If it is determined that the first brightness level identified for the first region of a display device exceeds a specified threshold (e.g., the maximum brightness level capable of being covered by at least one second region), the electronic device may perform the following operations. 
     Referring to  FIGS.  9  and  10   , in operation  901 , a processor (e.g.,  120  in  FIG.  1   ) of an electronic device  101  may identify an on-pixel ratio (OPR) of a display  210  (e.g., a ratio of at least one pixel in an on state (or in a state in which driving power is supplied) to a plurality of pixels included in the display  210 ) while displaying a screen  10  (see operation  401  in  FIG.  4   ) through a display device  160  (e.g., a display ( 210  in  FIG.  2   ) of the display device  160 , hereinafter referred to as a display  210 ). 
     In operation  903 , the processor  120  may determine whether or not the identified OPR of the display  210  exceeds a specified OPR threshold. In an embodiment, if the OPR of the display  210  exceeds the OPR threshold, the processor  120  may determine that a bright screen (or bright content) is being displayed through the display  210 . Alternatively, if the OPR of the display  210  does not exceed the OPR threshold, the processor  210  may determine that a dark screen (or dark content) is being displayed through the display  210 . 
     If it is determined in operation  903  that the OPR of the display  210  exceeds the OPR threshold, the processor  120  may determine a second brightness level to be controlled for at least one second region  163  in operation  905 . If it is determined that a bright screen is being displayed through the display  210 , the processor  210  may determine the maximum brightness level capable of being covered by at least one second region  163  as the second brightness level. Alternatively, the processor  210  may determine, as the second brightness level, a brightness level lowered by a specified first level from the maximum brightness level capable of being covered by at least one second region  163 . 
     If it is determined in operation  903  that the OPR of the display  210  does not exceed the OPR threshold, the processor  120  may determine a fourth brightness level to be controlled for at least one second region  163  in operation  907 . If it is determined that a dark screen is being displayed through the display  210 , the processor  120  may determine, as the fourth brightness level, a brightness level lowered by a second level greater than the first level from the maximum brightness level capable of being covered by at least one second region  163 . 
     In various embodiments, the processor  120  may sequentially perform operations  401  and  403  after performing operations  901  to  907  described above. If it is determined that the first brightness level of the first region  161  exceeds a specified threshold according to operations  401  and  403  performed after performing operations  901  to  907 , the processor  120  may apply or process a result of performing operations  901  to  907  (e.g., a brightness level determined for at least one second region  163 ). 
     The processor  120  may determine a third region  165   a  or  165   b  of the display  210  after determining the brightness level of the at least one second region  163 . For example, the processor  120  may determine, as the third region  165   a  or  165   b , a region extending from the edge of the display  210  to have a width that may cover at least one second region  163  formed adjacent to the edge. In this operation, in the case where the second brightness level is determined for at least one second region  163 , the processor  120  may determine a third region  165   b  having a second width w 2  and configure at least one second region  163  and the third region  165   b  having the second width w 2  to have the second brightness level. Alternatively, if the fourth brightness level is determined for at least one second region  163 , the processor  120  may determine a third region  165   a  having a first width w 1  less than the second width w 2  and configure the at least one second region  163  and the third region  165   a  having the first width w 1  as the fourth brightness level. 
       FIG.  11    is a diagram illustrating a third region of a display device according to an embodiment of the disclosure, and  FIG.  12    is a diagram illustrating an example of determining the intensity of a graphic effect applied to a third region of a display device according to an embodiment of the disclosure. 
     Various operations of an electronic device described with reference to  FIG.  11  or  12    may be sequentially performed subsequent to operation  401 , operation  403 , and operation  405  described above with reference to  FIG.  4   . For example, if it is determined that the first brightness level identified for the first region of a display device exceeds a specified threshold (e.g., the maximum brightness level capable of being covered by at least one second region) and if the second brightness level for at least one second region (e.g., the maximum brightness level capable of being covered by at least one second region or a brightness level lowered by a specified level from the maximum brightness level) is determined, the electronic device may perform the following operations. 
     Referring to  FIGS.  11  and  12   , a processor (e.g.,  120  in  FIG.  1   ) of an electronic device  101  may identify an on-pixel ratio (OPR) of the display  210  while displaying a screen  10  (see operation  401  in  FIG.  4   ) through a display device  160  (e.g., a display ( 210  in  FIG.  2   ) of the display device  160 , hereinafter referred to as a display  210 ). In an embodiment, if the identified OPR of the display  210  exceeds a specified first OPR threshold, the processor  120  may determine that a bright screen is being displayed through the display  210 , and if the identified OPR of the display  210  does not exceed the specified first OPR threshold, the processor  120  may determine that a dark screen is being displayed through the display  210 . In addition, the processor  120  may identify a brightness level  20  (luminance) of the display  210  configured in the electronic device  101  by a user input at the same time as, before, or after identifying the OPR of the display  210 . 
     In an embodiment, the processor  120  may determine the strength of a graphic effect (e.g., a gradation effect) to be applied to the display  210 , based on the identified OPR and brightness level  20  of the display  210 . The processor  120  may determine, as the strength of graphic effect, the width of a graphic effect (e.g., the width of the third region) to be applied to the display  210 . 
     In another embodiment, if the OPR of the display  210  does not exceed a specified first OPR threshold and if the brightness level  20  configured for the display  210  does not exceed a specified brightness level threshold (context A), the processor  120  may determine a third region  165   a  having a first width w 1 . Alternatively, if the OPR of the display  210  does not exceed the specified first OPR threshold and if the brightness level  20  of the display  210  exceeds the specified brightness level threshold (context B), the processor  120  may determine a third region  165   a  having the first width w 1 . The processor  120  may configure a second brightness level for at least one second region  163  and the third region  165   a  having the first width w 1 , and apply a gradation effect to the third region  165   a  having the first width w 1 . 
     In yet another embodiment, if the OPR of the display  210  exceeds the specified first OPR threshold and if the brightness level  20  of the display  210  does not exceed the specified brightness level threshold (context C), the processor  120  may determine a third region  165   b  having a second width w 2  greater than the first width w 1 . The processor  120  may configure a second brightness level for at least one second region  163  and the third region  165   b  having the second width w 2 , and apply a gradation effect to the third region  165   b  having the second width w 2 . 
     In still another embodiment, if the OPR of the display  210  exceeds the specified first OPR threshold and if the brightness level  20  of the display  210  exceeds the specified brightness level threshold (context D), the processor  120  may determine a third region  165   c  having a third width w 3  greater than the second width w 2 . The processor  120  may configure a second brightness level for at least one second region  163  and the third region  165   c  having the third width w 3 , and apply a gradation effect to the third region  165   c  having the third width w 3 . 
     According to various embodiments, the processor  120  may identify distribution of at least one pixel in an on state (or in a state of receiving driving power), based on the OPR, in the operation of identifying the OPR of the display  210 . For example, the processor  120  may identify a ratio of at least one pixel in the on state to the identified OPR of the display  210  in the central region of the display  210  defined to have a predetermined area. In an embodiment, if the ratio of at least one pixel in the on state to the identified OPR of the display  210  exceeds a specified ratio in the central region of the display  210 , the processor  120  may determine that a bright screen is being displayed in the central region of the display  210  and that a relatively dark screen is being displayed in areas other than the central region. In this case, the processor  120  may determine the width of the third region to be the third width w 3  to cover the bright screen displayed in the central region of the display  210 , regardless of the identified OPR of the display  210  and the configured brightness level  20  of the display  210 . 
     An electronic device according to the embodiments described above may include a display, an optical sensor disposed under the display, and a processor electrically connected to the display and the optical sensor. 
     According to other embodiments, the display may include a first region having a first pixel density and a second region having a second pixel density, which is less than the first pixel density, and corresponding to a disposition region of the optical sensor. 
     According to still other embodiments, the processor may identify a first brightness level for the first region, if the first brightness level exceeds a specified threshold, determine a second brightness level for the second region, based on at least one of the first brightness level, the first pixel density, and the second pixel density, identify a third region of the display defined to include the second region along the edge of the first region, and configure the brightness of the second region and the third region as the second brightness level. 
     According to various embodiments, the processor may identify the first brightness level for the first region while displaying a screen using the display. 
     According to other embodiments, the processor may obtain a dominant color from a screen displayed on the first region, excluding the third region, and apply a gradation effect to the third region, based on the obtained color. 
     According to still other embodiments, the processor may configure a maximum brightness level at which the second region is maximally bright as the specified threshold. 
     According to various embodiments, the processor may determine the maximum brightness level as the second brightness level if the first brightness level exceeds the specified threshold by a specified level range or more, and determine a brightness level lower than the maximum brightness level as the second brightness level if the first brightness level exceeds the specified threshold by less than the specified level range. 
     According to other embodiments, the processor may identify an on-pixel ratio (OPR) of the display, if the OPR of the display exceeds a specified OPR threshold, determine the maximum brightness level as the second brightness level, and if the OPR of the display does not exceed the specified OPR threshold, determine a brightness level lower than the maximum brightness level as the second brightness level. 
     According to still other embodiments, the processor may identify the third region having a first width if the first brightness level exceeds the specified threshold by less than a specified level range, and identify the third region having a second width greater than the first width if the first brightness level exceeds the specified threshold by the specified level range or more. 
     According to various embodiments, the processor may supply a first driving power to the second region and supply a second driving power less than the first driving power to the third region, as at least part of configuring the second region and the third region as the second brightness level. 
     According to other embodiments, if the first brightness level does not exceed the specified threshold, the processor may determine a third brightness level for the second region, based on at least one of the first brightness level, the first pixel density, and the second pixel density, and configure the brightness of the second region as the third brightness level. 
     According to still other embodiments, the processor may determine a brightness level corresponding to the first brightness level as the third brightness level. 
     According to various embodiments, the first region may include a plurality of first pixel regions based on the first pixel density, and the second region may include a plurality of second pixel regions and a plurality of non-pixel regions based on the second pixel density. 
     A display control method of an electronic device including a display including a first region having a first pixel density and a second region having a second pixel density less than the first pixel density according to various embodiments described above may include identifying a first brightness level for the first region, identifying that the first brightness level exceeds a specified threshold, determining a second brightness level for the second region, based on at least one of the first brightness level, the first pixel density, and the second pixel density, identifying a third region of the display defined to include the second region along the edge of the first region, and configuring the brightness of the second region and the third region as the second brightness level. 
     According to various embodiments, the electronic device may include an optical sensor disposed under the second region. 
     According to other embodiments, the display control method may further include obtaining a dominant color from a screen displayed on the first region, excluding the third region, and applying a gradation effect to the third region, based on the obtained color. 
     According to still other embodiments, the identifying that the first brightness level exceeds a specified threshold may include configuring a maximum brightness level at which the second region is maximally bright as the specified threshold. 
     According to various embodiments, the determining of the second brightness level for the second region may include, if the first brightness level exceeds the specified threshold by a specified level range or more, determining the maximum brightness level as the second brightness level, and if the first brightness level exceeds the specified threshold by less than the specified level range, determining a brightness level lower than the maximum brightness level as the second brightness level. 
     According to other embodiments, the display control method may further include identifying an on-pixel ratio (OPR) of the display. 
     According to still other embodiments, the determining of the second brightness level for the second region may include, if the OPR of the display exceeds a specified OPR threshold, determining the maximum brightness level as the second brightness level, and if the OPR of the display does not exceed the specified OPR threshold, determining a brightness level lower than the maximum brightness level as the second brightness level. 
     According to various embodiments, the identifying of the third region of the display may include identifying the third region having a first width if the first brightness level exceeds the specified threshold by less than a specified level range, and identifying the third region having a second width greater than the first width if the first brightness level exceeds the specified threshold by the specified level range or more. 
     According to other embodiments, the configuring of the brightness of the second region and the third region as the second brightness level may include supplying a first driving power to the second region and supplying a second driving power less than the first driving power to the third region. 
     An electronic device according to various embodiments described above may include a display, an optical sensor disposed under the display, and a display driver integrated circuit electrically connected to the display. 
     According to various embodiments, the display may include a first region having a first pixel density and a second region having a second pixel density, which is less than the first pixel density, and corresponding to a disposition region of the optical sensor. 
     According to other embodiments, the display driver integrated circuit may identify a first brightness level for the first region, if the first brightness level exceeds a specified threshold, determine a second brightness level for the second region, based on at least one of the first brightness level, the first pixel density, and the second pixel density, identify a third region of the display defined to include the second region along the edge of the first region, and configure the brightness of the second region and the third region as the second brightness level. 
     According to still other embodiments, the display driver integrated circuit may obtain a dominant color from a screen displayed on the first region, excluding the third region, and apply a gradation effect to the third region, based on the obtained color. 
     Hereinafter, an example of an electronic device structure to which various embodiments of the disclosure may be applied will be described with reference to  FIGS.  13 A,  13 B, and  14   . 
       FIG.  13 A  is a diagram illustrating a front surface of an electronic device according to an embodiment of the disclosure, and  FIG.  13 B  is a diagram illustrating a rear surface of an electronic device according to an embodiment of the disclosure. 
     Referring to  FIGS.  13 A and  13 B , an electronic device  1300  according to an embodiment may include a housing  1310  that includes a first surface  1310 A (or a front surface), a second surface  1310 B (or a rear surface), and a side surface  1310 C surrounding a space between the first surface  1310 A and the second surface  1310 B. In another embodiment, the housing  1310  may refer to a structure that forms part of the first surface  1310 A, the second surface  1310 B, and the side surface  1310 C. According to an embodiment, the first surface  1310 A may be formed of a front plate  1302  (e.g., a glass plate including various coating layers, or a polymer plate) at least a portion of which is substantially transparent. In an embodiment, the second surface  1310 B may be formed of a substantially opaque rear plate  1311 . In another embodiment, the rear plate  1311  may be formed of, for example, coated or tinted glass, ceramic, polymer, metal (e.g., aluminum, stainless steel (STS), or magnesium), or a combination of at least two of the above materials. The side surface  1310 C may be coupled to the front plate  1302  and the rear plate  1311  and may be formed by a side bezel structure  1318  (or a side member) including metal and/or polymer. In some embodiments, the rear plate  1311  and the side bezel structure  1318  may be integrally formed and may include the same material (e.g., a metal material such as aluminum). 
     In an embodiment, the front plate  1302  may include two first regions  1310 D that extend seamlessly from the first surface  1310 A to be bent toward the rear plate  1311  at both ends of the long edge of the front plate  1302 . In another embodiment (see  FIG.  13 B ), the rear plate  1311  may include two second regions  1310 E that extend seamlessly from the second surface  1310 B to be bent toward the front plate  1302  at both ends of the long edge. In still other embodiments, the front plate  1302  (or the rear plate  1311 ) may include only one of the first regions  1310 D (or the second regions  1310 E). In some embodiments, some of the first regions  1310 D or second regions  1310 E may be excluded. In the above embodiment, the side bezel structure  1318 , when viewed from the side of the electronic device  1300 , may have a first thickness (or width) on the side surface that does not include the first regions  1310 D or the second regions  1310 E and may have a second thickness, which is less than the first thickness, on the side surface including the first regions  1310 D or the second regions  1310 E. 
     According to an embodiment, the electronic device  1300  may include at least one or more of a display  1301 , an input device  1303 , sound output devices  1307  and  1314 , sensor modules  1304  and  1319 , camera modules  1305 ,  1312 , and  1313 ), a key input device  1317 , an indicator (not shown), and connectors  1308  and  1309 . In some embodiments, the electronic device  1300  may exclude at least one (e.g., the key input device  1317  or the indicator) of the elements or further include other elements. 
     In an embodiment, the display  1301  may be visible through, for example, a top portion of the front plate  1302 . In other embodiments, at least a portion of the display  1301  may be visible through the front plate  1302  forming the first surface  1310 A and the first region  1310 D of the side surface  1310 C. The display  1301  may be connected to a touch sensing circuit, a pressure sensor capable of measuring the intensity (pressure) of a touch, and/or a digitizer detecting a magnetic-field type stylus pen or may be disposed adjacent thereto. In still other embodiments, at least some of the sensor modules  1304  and  1319  and/or at least a part of the key input device  1317  may be disposed in the first region  1310 D and/or the second region  1310 E. 
     In some embodiments (not shown), an audio module  1314 , at least one or more of the sensor module  1304 , the camera module  1305  (e.g., an optical sensor or an image sensor), and a fingerprint sensor may be included in the rear surface of the screen display region of the display  1301 . In other embodiments, at least some of the sensor modules  1304  and  1319  and/or at least a part of the key input device  1317  may be disposed in the first regions  1310 D and/or the second regions  1310 E. 
     The input device  1303  may include a microphone. In some embodiments, the input device  1303  may include a plurality of microphones disposed to detect the direction of sound. The sound output devices  1307  and  1314  may include speakers. The speakers  1307  and  1314  may include an external speaker  1307  and a call receiver (e.g., an audio module  1314 ). In other embodiments, the input device  1303  (e.g., a microphone), the speakers  1307  and  1314 , and the connectors  1308  and  1309  may be disposed in the space of the electronic device  1300 , and may be exposed to the external environment through at least one hole formed in the housing  1310 . In some embodiments, a hole formed in the housing  1310  may be commonly used for the input device  1303  (e.g., a microphone) and the speakers  1307  and  1314 . In some embodiments, the speakers  1307  and  1314  may include a speaker (e.g., a piezo speaker) that operates without a hole formed in the housing  1310 . 
     In an embodiment, the sensor modules  1304  and  1319  may produce an electrical signal or data value corresponding to an internal operating state of the electronic device  1300  or an external environmental state. In another embodiment, the sensor modules  1304  and  1319  may include, for example, a first sensor module  1304  (e.g., a proximity sensor) disposed on the first surface  1310 A of the housing  1310 , a second sensor module (not shown) (e.g., a fingerprint sensor), and/or a third sensor module  1319  (e.g., an HRM sensor) disposed on the second surface  1310 B of the housing  1310 . The fingerprint sensor may be disposed on the second surface  1310 B of the housing  1310 , as well as on the first surface  1310 A (e.g., the display  1301 ) thereof. The electronic device  1300  may further include at least one of sensor modules that are not shown in the drawing, for example, a gesture sensor, a gyro sensor, an atmosphere pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor. 
     The camera modules  1305 ,  1312 , and  1313  may include a first camera module  1305  disposed on the first surface  1310 A of the electronic device  1300 , a second camera module  1312  disposed on the second surface  1310 B, and/or a flash  1313 . The camera modules  1305  and  1312  may include one or more lenses, an image sensor, and/or an image signal processor. The flash  1313  may include, for example, a light-emitting diode or a xenon lamp. The first camera module  1305  may be disposed, as an under-display camera (UDC), under the display panel. In some embodiments, two or more lenses (wide-angle and telephoto lenses) and image sensors may be disposed on one surface of the electronic device  1300 . In other embodiments, the plurality of first camera modules  1305  may be disposed on the first surface (e.g., the surface on which a screen is displayed) of the electronic device  1300  in the form of an under-display camera (UDC). 
     In an embodiment, the key input device  1317  may be disposed on the side surface  1310 C of the housing  1310 . In another embodiment, the electronic device  1300  may exclude a part or entirety of the above-mentioned key input device  1317 , and the excluded key input device  1317  may be implemented on the display  1301  in another form such as soft keys or the like. In some embodiments, the key input device  1317  may be implemented using a pressure sensor included in the display  1301 . 
     In an embodiment, the indicator may be disposed, for example, on the first surface  1310 A of the housing  1310 . The indicator may provide, for example, state information of the electronic device  1300  in the form of light. In another embodiment, the indicator may provide, for example, a light source that interworks with the operation of the camera module  1305 . The indicator may include, for example, an LED, an IR LED, and a xenon lamp. 
     In an embodiment, the connectors  1308  and  1309  may include a first connector hole  1308  capable of receiving a connector (e.g., a USB connector) for transmitting and receiving power and/or data to and from an external electronic device, and/or a second connector hole  1309  (or an earphone jack) capable of receiving a connector for transmitting and receiving audio signals to and from an external electronic device. 
     Some camera modules  1305  of the camera modules  1305  and  1312 , some sensor modules  1304  of the sensor modules  1304  and  1319 , or the indicator may be disposed to be visible through the display  1301 . The camera module  1305  may be disposed to overlap the display area and may also display a screen in the display area corresponding to the camera module  1305 . Some sensor modules  1304  may be disposed in the inner space of the electronic device to perform their functions without being visually exposed through the front plate  1302 . 
       FIG.  14    is an exploded view illustrating an electronic device according to an embodiment of the disclosure. 
     Referring to  FIG.  14   , an electronic device  1400  may include a side member  1410  (e.g., a side bezel structure), a first support member  1411  (e.g., a bracket or support structure), a front plate  1420  (e.g., a front cover), a display  1430 , a printed circuit board  1440 , battery  1450 , a second support member  1460  (e.g., a rear case), an antenna  1470 , and a rear plate  1480  (e.g., a rear cover). In some embodiments, the electronic device  1400  may exclude at least one (e.g., the first support member  1411  or the second support member  1460 ) of the elements or further include other elements. At least one of the elements of the electronic device  1400  may be the same as or similar to at least one of the elements of the electronic device  1300  in  FIG.  13 A or  13 B , so redundant descriptions thereof will be omitted below. 
     In an embodiment, the first support member  1411  may be disposed inside the electronic device  1400  to be connected to the side member  1410  or to be integrally formed with the side member  1410 . In an embodiment, the first support member  1411  may be formed of, for example, a metal material and/or a non-metal (e.g., polymer) material. The first support member  1411  may have a display  1430  coupled to one surface thereof and a printed circuit board  1440  coupled to the opposite side thereof. The printed circuit board  1440  may be equipped with a processor, a memory, and/or an interface mounted thereon. The processor may include, for example, one or more of a central processing unit, an application processor, a graphic processing unit, an image signal processor, a sensor hub processor, or a communication processor. The memory may include, for example, a volatile memory and/or a non-volatile memory. 
     The interface may include, for example, a high-definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, and/or an audio interface. For example, the interface may electrically or physically connect the electronic device  1400  to an external electronic device and include a USB connector, an SD card/MMC connector, or an audio connector. 
     In an embodiment, the battery  1450  is a device for supplying power to at least one element of the electronic device  1400 , and may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell. At least a part of the battery  1450  may be disposed, for example, substantially on the same plane as the printed circuit board  1440 . The battery  1450  may be integrally disposed inside the electronic device  1400 . In another embodiment, the battery  1450  may be disposed to be detachable from the electronic device  1400 . 
     In an embodiment, the antenna  1470  may be disposed between the rear plate  1480  and the battery  1450 . In another embodiment, the antenna  1470  may include, for example, a near-field communication (NFC) antenna, a wireless charging antenna, and/or a magnetic secure transmission (MST) antenna. For example, the antenna  1470  may perform short-range communication with an external device or wirelessly transmit and receive power required for charging. In another embodiment, an antenna structure may be formed by a part of the side bezel member  1410  and/or first support member  1411  or a combination thereof. 
     According to various embodiments, the first support member  1411  of the side member  1410  may include a first surface  1410   a  facing the front plate  1420  and a second surface  1410   b  facing in the opposite direction (e.g., a rear plate direction) of the first surface  1410   a . According to other embodiments, the camera module  1490  may be disposed between the first support member  1411  and the rear plate  1480 . According to still other embodiments, the camera module  1490  may be disposed to protrude toward the front plate  1420  or to be visible through a through-hole  1401  formed from the first surface  1410   a  to the second surface  1410   b  of the first support member  1411 . According to various embodiments, a portion of the camera module  1490  protruding through the through hole  1401  may be disposed to detect an external environment at a corresponding position of the display  1430 . In another embodiment, in the case where the camera module  1490  is disposed between the display  1430  and the first support member  1411 , the through hole  1401  may be unnecessary. 
     Hereinafter, another example of a structure of an electronic device to which various embodiments of the disclosure may be applied will be described with reference to  FIGS.  15 A,  15 B, and  16   . 
       FIG.  15 A  is a diagram illustrating an unfolded state of an electronic device according to an embodiment of the disclosure.  FIG.  15 B  is a diagram illustrating a folded state of an electronic device according to an embodiment of the disclosure. 
     Referring to  FIGS.  15 A and  15 B , in an embodiment, an electronic device  1800  may include a foldable housing  1500 , a hinge cover  1530  that covers a foldable portion of the foldable housing  1500 , and a flexible or foldable display  1600  (hereinafter, abbreviated to the “display  1600 ”) that is disposed in a space formed by the foldable housing  1500 . In an embodiment, a surface on which the display  1600  is disposed is defined as a first surface or a front surface of the electronic device  1800 . A surface opposite to the front surface is defined as a second surface or a rear surface of the electronic device  1800 . A surface that surrounds a space between the front surface and the rear surface is defined as a third surface or a side surface of the electronic device  1800 . 
     In an embodiment, the foldable housing  1500  may include a first housing structure  1510 , a second housing structure  1520  including a sensor area  1524 , a first back cover  1580 , and a second back cover  1590 . The foldable housing  1500  of the electronic device  1800  is not limited to the form and the coupling illustrated in  FIGS.  15 A and  15 B  and may be implemented by a combination and/or a coupling of other shapes or parts. In another embodiment, the first housing structure  1510  and the first back cover  1580  may be integrally formed with each other, and the second housing structure  1520  and the second back cover  1590  may be integrally formed with each other. 
     In an embodiment, the first housing structure  1510  and the second housing structure  1520  may be disposed on opposite sides of a folding axis (an axis A) and may have substantially symmetrical shapes with respect to the folding axis A. As will be described below, the angle or distance between the first housing structure  1510  and the second housing structure  1520  may vary depending on whether the electronic device  1800  is in a flat, folded, or intermediate state. In the illustrated embodiment, unlike the first housing structure  1510 , the second housing structure  1520  may additionally include the sensor area  1524  in which various sensors are arranged, but may have a symmetrical shape in the other area. 
     In another embodiment, as illustrated in  FIG.  15 A , the first housing structure  1510  and the second housing structure  1520  may form a recess together in which the display  1600  is received. In the illustrated embodiment, due to the sensor area  1524 , the recess may have two or more different widths in a direction perpendicular to the folding axis A. 
     For example, the recess may have (1) a first width w 1  between a first portion  1510   a  of the first housing structure  1510  that is parallel to the folding axis A and a first portion  1520   a  of the second housing structure  1520  that is formed on the periphery of the sensor area  1524  and (2) a second width w 2  formed by a second portion  1510   b  of the first housing structure  1510  and a second portion  1520   b  of the second housing structure  1520  that does not correspond to the sensor area  1524  and that is parallel to the folding axis A. The second width w 2  may be formed to be longer than the first width w 1 . In other words, the first portion  1510   a  of the first housing structure  1510  and the first portion  1520   a  of the second housing structure  1520  that have asymmetrical shapes may form the first width w 1  of the recess, and the second portion  1510   b  of the first housing structure  1510  and the second portion  1520   b  of the second housing structure  1520  that have symmetrical shapes may form the second width w 2  of the recess. In an embodiment, the first portion  1520   a  and the second portion  1520   b  of the second housing structure  1520  may have different distances from the folding axis A. The widths of the recess are not limited to the illustrated examples. In various embodiments, the recess may have a plurality of widths by the form of the sensor area  1524  or by the portions of the first housing structure  1510  and the second housing structure  1520  that have asymmetrical shapes. 
     In still another embodiment, at least a part of the first housing structure  1510  and the second housing structure  1520  may be formed of metal or non-metal having strength selected to support the display  1600 . 
     The sensor area  1524  may be formed to have a predetermined area adjacent to one corner of the second housing structure  1520 . However, the arrangement, shape, and size of the sensor area  1524  are not limited to the illustrated example. In another embodiment, the sensor area  1524  may be provided in another corner of the second housing structure  1520  or in any area between an upper corner and a lower corner of the second housing structure  1520 . In an embodiment, parts embedded in the electronic device  1800  to perform various functions may be exposed on the front surface of the electronic device  1800  though the sensor area  1524  or through one or more openings formed in the sensor area  1524 . In various embodiments, the parts may include various types of sensors. The sensors may include, for example, at least one of a front camera, a receiver, or a proximity sensor. 
     In an embodiment, the first back cover  1580  may be disposed on one side of the folding axis A on the rear surface of the electronic device  1800  and may have, for example, a substantially rectangular periphery that is surrounded by the first housing structure  1510 . Similarly, the second back cover  1590  may be disposed on an opposite side of the folding axis A on the rear surface of the electronic device  1800  and may have a periphery surrounded by the second housing structure  1520 . 
     In another embodiment, the first back cover  1580  and the second back cover  1590  may have substantially symmetrical shapes with respect to the folding axis (the axis A). However, the first back cover  1580  and the second back cover  1590  do not necessarily have symmetrical shapes, and in another embodiment, the electronic device  1800  may include the first back cover  1580  and the second back cover  1590  in various shapes. In yet another embodiment, the first back cover  1580  may be integrally formed with the first housing structure  1510 , and the second back cover  1590  may be integrally formed with the second housing structure  1520 . 
     In still another embodiment, the first back cover  1580 , the second back cover  1590 , the first housing structure  1510 , and the second housing structure  1520  may form a space in which various parts (e.g., a printed circuit board or a battery) of the electronic device  1800  are disposed. In an embodiment, one or more parts may be disposed or visually exposed on the rear surface of the electronic device  1800 . For example, at least part of a sub-display  1690  may be visually exposed through a first rear area  1582  of the first back cover  1580 . In another embodiment, one or more parts or sensors may be visually exposed through a second rear area  1592  of the second back cover  1590 . In various embodiments, the sensors may include a proximity sensor and/or a rear camera. 
     Referring to  FIG.  15 B , the hinge cover  1530  may be disposed between the first housing structure  1510  and the second housing structure  1520  to hide internal parts (e.g., hinge structures). The hinge cover  1530  may be hidden by part of the first housing structure  1510  and part of the second housing structure  1520 , or may be exposed to the outside, depending on a state (e.g., a flat state or a folded state) of the electronic device  1800 . 
     For example, when the electronic device  1800  is in a flat state as illustrated in  FIG.  15 A , the hinge cover  1530  may be hidden by the first housing structure  1510  and the second housing structure  1520  and thus may not be exposed. In another example, when the electronic device  1800  is in a folded state (e.g., a fully folded state) as illustrated in  FIG.  15 B , the hinge cover  1530  may be exposed between the first housing structure  1510  and the second housing structure  1520  to the outside. In yet another example, when the electronic device  1800  is in an intermediate state in which the first housing structure  1510  and the second housing structure  1520  are folded with a certain angle, the hinge cover  1530  may be partially exposed between the first housing structure  1510  and the second housing structure  1520  to the outside. However, in this case, the exposed area may be smaller than that when the electronic device  1800  is in a fully folded state. In an embodiment, the hinge cover  1530  may include a curved surface. 
     The display  1600  may be disposed in the space formed by the foldable housing  1500 . The display  1600  may be mounted in the recess formed by the foldable housing  1500  and may form almost the entire front surface of the electronic device  1800 . 
     Accordingly, the front surface of the electronic device  1800  may include the display  1600 , and a partial area of the first housing structure  1510  and a partial area of the second housing structure  1520  that are adjacent to the display  1600 . In an embodiment, the rear surface of the electronic device  1800  may include the first back cover  1580 , a partial area of the first housing structure  1510  that is adjacent to the first back cover  1580 , the second back cover  1590 , and a partial area of the second housing structure  1520  that is adjacent to the second back cover  1590 . 
     The display  1600  may refer to a display, at least a partial area of which is able to be transformed into a flat surface or a curved surface. In an embodiment, the display  1600  may include a folding area  1603 , a first area  1601  disposed on one side of the folding area  1603  (on a left side of the folding area  1603  illustrated in  FIG.  15 A ), and a second area  1602  disposed on an opposite side of the folding area  1603  (on a right side of the folding area  1603  illustrated in  FIG.  15 A ). 
     The areas of the display  1600  illustrated in  FIG.  15 A  are illustrative, and the display  1600  may be divided into a plurality of (e.g., four or more, or two) areas according to a structure or function of the display  1600 . In the embodiment illustrated in  FIG.  15 A , the areas of the display  1600  may be divided from each other by the folding area  1603  or the folding axis (the axis A) that extends in parallel to the y-axis. However, in another embodiment, the display  1600  may be divided into areas with respect to another folding area (e.g., a folding area parallel to the x-axis) or another folding axis (e.g., a folding axis parallel to the x-axis). 
     In an embodiment, the first area  1601  and the second area  1602  may have substantially symmetrical shapes with respect to the folding area  1603 . However, unlike the first area  1601 , the second area  1602  may include a notch  1604  that is cut according to the presence of the sensor area  1524 , but in the other area, the second area  1602  may be symmetric to the first area  1601 . In other words, the first area  1601  and the second area  1602  may each include a portion having a symmetrical shape and a portion having an asymmetrical shape. 
     Hereinafter, operations of the first housing structure  1510  and the second housing structure  1520  and the areas of the display  1600  according to states (e.g., a flat state and a folded state) of the electronic device  1800  will be described. 
     In an embodiment, when the electronic device  1800  is in a flat state (e.g.,  FIG.  15 A ), the first housing structure  1510  and the second housing structure  1520  may be arranged to face the same direction while forming an angle of 1680 degrees. The surface of the first area  1601  of the display  1600  and the surface of the second area  1602  thereof may face the same direction (e.g., face away from the front surface of the electronic device  1800 ) while forming an angle of 1680 degrees. The folding area  1603  may form the same plane together with the first area  1601  and the second area  1602 . 
     In another embodiment, when the electronic device  1800  is in a folded state (e.g.,  FIG.  15 B ), the first housing structure  1510  and the second housing structure  1520  may be arranged to face each other. The surface of the first area  1601  of the display  1600  and the surface of the second area  1602  thereof may face each other while forming a narrow angle (e.g., an angle between 0 degrees and 10 degrees). At least part of the folding area  1603  may form a curved surface having a predetermined curvature. 
     In still another embodiment, when the electronic device  1800  is in an intermediate state (e.g.,  FIG.  15 B ), the first housing structure  1510  and the second housing structure  1520  may be arranged to have a certain angle therebetween. The surface of the first area  1601  of the display  1600  and the surface of the second area  1602  thereof may form an angle that is greater than that in the folded state and is smaller than that in the flat state. At least part of the folding area  1603  may form a curved surface having a predetermined curvature, and the curvature may be smaller than that in the folded state. 
       FIG.  16    is an exploded view illustrating an electronic device according to an embodiment of the disclosure. 
     Referring to  FIG.  16   , in an embodiment, an electronic device  1800  may include a display unit  30 , a bracket assembly  40 , a substrate  1700 , a first housing structure  1510 , a second housing structure  1520 , a first back cover  1580 , and a second back cover  1590 . In this disclosure, the display unit  30  may be referred to as the display module or the display assembly. 
     In an embodiment, the display unit  30  may include the display  1600  and at least one plate or layer  1640  on which the display  1600  is mounted. In an embodiment, the plate  1640  may be disposed between the display  1600  and the bracket assembly  40 . The display  1600  may be disposed on at least part of one surface (e.g., an upper surface with respect to  FIG.  16   ) of the plate  1640 . The plate  1640  may be formed in a shape corresponding to the display  1600 . For example, a partial area of the plate  1640  may be formed in a shape corresponding to the notch  1604  of the display  1600 . 
     In another embodiment, the bracket assembly  40  may include a first bracket  41 , a second bracket  42 , hinge structures disposed between the first bracket  41  and the second bracket  42 , the hinge cover  43  that covers the hinge structures when viewed from the outside, and a wiring member  44  (e.g., a flexible printed circuit (FPC)) that traverses the first bracket  41  and the second bracket  42 . 
     In still another embodiment, the bracket assembly  40  may be disposed between the plate  1640  and the substrate  1700 . For example, the first bracket  41  may be disposed between the first area  1601  of the display  1600  and a first substrate  1710 . The second bracket  42  may be disposed between the second area  1602  of the display  1600  and a second substrate  1720 . 
     In yet another embodiment, at least a part of the wiring member  44  and the hinge structures may be disposed inside the bracket assembly  40 . The wiring member  44  may be arranged in a direction (e.g., the x-axis direction) across the first bracket  41  and the second bracket  42 . The wiring member  44  may be arranged in a direction (e.g., the x-axis direction) that is perpendicular to a folding axis (e.g., the y-axis or the folding axis A of  FIG.  15 A ) of the folding area  1603  of the electronic device  1800 . 
     As mentioned above, the substrate  1700  may include the first substrate  1710  disposed at the first bracket  41  side and the second substrate  1720  disposed at the second bracket  42  side. The first substrate  1710  and the second substrate  1720  may be disposed in a space that is formed by the bracket assembly  40 , the first housing structure  1510 , the second housing structure  1520 , the first back cover  1580 , and the second back cover  1590 . Parts for implementing various functions of the electronic device  1800  may be mounted on the first substrate  1710  and the second substrate  1720 . 
     The first housing structure  1510  and the second housing structure  1520  may be assembled so as to be coupled to opposite sides of the bracket assembly  40  in the state in which the display unit  30  is coupled to the bracket assembly  40 . As will be described herein, the first housing structure  1510  and the second housing structure  1520  may slide on the opposite sides of the bracket assembly  40  and may be coupled with the bracket assembly  40 . 
     In an embodiment, the first housing structure  1510  may include a first rotation support surface  1512 , and the second housing structure  1520  may include a second rotation support surface  1522  corresponding to the first rotation support surface  1512 . The first rotation support surface  1512  and the second rotation support surface  1522  may include curved surfaces that correspond to curved surfaces included in the hinge cover  43 . 
     In another embodiment, when the electronic device  1800  is in a flat state (e.g., the electronic device  1800  of  FIG.  15 A ), the first rotation support surface  1512  and the second rotation support surface  1522  may cover the hinge cover  43  such that the hinge cover  43  is not exposed, or is exposed to a minimum, on the rear surface of the electronic device  1800 . Meanwhile, when the electronic device  1800  is in a folded state (e.g., the electronic device  1800  of  FIG.  15 B ), the first rotation support surface  1512  and the second rotation support surface  1522  may rotate along the curved surfaces included in the hinge cover  43 , such that the hinge cover  43  is exposed on the rear surface of the electronic device  1800  to the maximum. 
       FIG.  17 A  is a cross-sectional view of an electronic device viewed in one direction according to an embodiment of the disclosure, and  FIG.  17 B  is an enlarged view of one area of an electronic device according to an embodiment of the disclosure. The one direction of the electronic device may refer to the direction A-A′ illustrated in  FIG.  3   , and the one area of the electronic device may refer to the area A illustrated in  FIG.  17 A . 
     Although a description with reference to  FIGS.  17 A and  17 B  will be made based on an example of an unbreakable (UB) type OLED display (e.g., a curved display), the disclosure is not limited thereto. The description with reference to  FIGS.  17 A and  17 B  may also be applied to a flat type display such as an OCTA (on-cell touch active matrix organic light-emitting diode (AOLED)). 
     Referring to  FIG.  17 A , an electronic device  1900  may include a front cover  1920  (e.g., a cover member, a front plate, a front window, or a first plate) facing in a first direction (direction {circle around (1)}), a rear cover  1980  (e.g., a rear cover member, a rear plate, a rear window, or a second plate) facing in a direction opposite the first direction, a side member  1910  surrounding a space  1900  between the front cover  1920  and the rear cover  1980 . According to an embodiment, the electronic device  1900  may include a first waterproof member  19201  disposed between an auxiliary material layer  2040  and the side member  1910  of the display  2000 . According to an embodiment, the electronic device  1900  may include a second waterproof member  19801  disposed between the side member  1910  and the rear cover  1980 . The first waterproof member  19201  and the second waterproof member  19801  may prevent foreign substances or moisture from flowing into the inner space  19001  of the electronic device  1900 . In various embodiments, the first waterproof member  19201  and the second waterproof member  19801  may be replaced with an adhesive member. In various embodiments, the waterproof member may be disposed in at least a portion of a mounting support structure between a camera device  2100  and the side member  1910 . 
     According to various embodiments, the side member  1910  may further include a first support member  1911  at least partially extending to the inner space  19001  of the electronic device  1900 . According to an embodiment, the first support member  1911  may be formed by being structurally coupled to the side member  1910 . According to an embodiment, the first support member  1911  may support the camera device  2100  such that the camera device  2100  is aligned and disposed near the rear surface of the display panel  2031  through an opening (e.g., the opening OP in  FIG.  17 B ) formed in the auxiliary material layer  2040  of the display  2000 . 
     According to other embodiments, the camera device  2100  may include a camera housing  2110 , a lens housing  2120  disposed in an inner space  21101  of the camera housing  2110  and at least partially protruding in the display direction (e.g., direction {circle around (1)}), a plurality of lenses ( 2130 :  2131 ,  2132 ,  2133 , and  2134 ) disposed at regular intervals in an inner space  21201  of the lens housing  2120 , and at least one image sensor  2140  disposed in the inner space  21101  of the camera housing  2110  to obtain at least a portion of the light passing through the plurality of lenses  2130 . According to an embodiment, if the camera device  2100  has an auto focus (AF) function, the lens housing  2120  may move by a predetermined driving unit in the camera housing  2110  such that a distance to the display panel  2031  varies. According to another embodiment, in relation to the AF function of the camera device  2100 , the driving unit for changing the position of at least one of the plurality of lenses  2130  may be disposed. In another embodiment, the camera housing  2110  may be excluded from the camera device  2100 , and the lens housing  2120  may be directly disposed on the first support member  1911  through a predetermined alignment process. According to yet another embodiment, in the case where the lens housing  2120  is disposed directly on the first support member  1911 , the camera housing  2110  may be excluded to reduce the arrangement space of the camera device  2100 , and the lens housing  2120  is may be attached to one side surface of the first support member  1911 . According to still another embodiment, the camera device  2100  may be aligned through the through hole  1901  of the first support member  1911  and then attached to the rear surface of the first support member  1911  by an adhesive member  1912  (e.g., a bonding member or a tape member). 
     According to various embodiments, the display  2000  may include a touch panel, a POL  2032 , a display panel  2031 , a light blocking layer (e.g., the light blocking layer  2041  in  FIG.  17 B ), and a buffer layer (e.g., the buffer layer  2042  in  FIG.  17 B ), a digitizer, a functional member (e.g., the functional member  2043  in  FIG.  17 B ), and/or a conductive member (e.g., the conductive member  2044  in  FIG.  17 B ). According to an embodiment, the camera device  2100  may be supported by a second support member  1960  (e.g., a rear case) that is further disposed in the inner space  19001  of the electronic device  1900 . 
     Referring to  FIGS.  17 A and  17 B , the electronic device  1900  may include an adhesive layer  2010 , a POL  2032 , a display panel  2031 , and an auxiliary material layer  2040  disposed between the front cover  1920  and the side member  1910  on the rear surface of the front cover  1920 . In an embodiment, when the front cover  1920  is viewed from above, the POL  2032  may include an opening  20321  formed to improve optical transmittance of the camera device  2100 . In various embodiments, a portion of the adhesive member  2010 , disposed on the POL  2032 , corresponding to the opening  20321  may be at least partially omitted. In other embodiments, the opening  20321  formed in the POL  2032  may be filled with a material (e.g., an index matching material) for matching a refractive index according to an increase in interfacial reflection. In another embodiment, the areas corresponding to the plurality of lenses  2130  of the POL  2032  may be configured to have high transmittance, instead of having the opening  20321  formed thereon. For example, at least a partial area (e.g., an area corresponding to the plurality of lenses  2130 ) of the POL  2032  may be formed of a material having a transmittance different from those of the remaining areas of the POL  2032  or may be configured as other members capable of increasing transmittance. In another embodiment, when the front cover  1920  is viewed from above, the auxiliary material layer  2040  may include an opening OP formed in an area that at least partially overlaps the plurality of lenses  2130 . In yet another embodiment, the opening OP formed in the auxiliary material layer  2040  may be configured as a single opening OP in such a way that an opening formed in the light blocking layer  2041 , an opening formed in the buffer layer  2042 , an opening formed in the functional member  2043 , and an opening formed in the conductive member  2044  overlap each other. According to other embodiments, the above-described openings may have different sizes corresponding to the shape of the camera device  2100 . 
     According to various embodiments, the display panel  2031  may include active areas (area A1 and area A2). According to an embodiment, the display panel  2031  may include a transmission area A1 that overlaps the angle of view θ of the camera device  2100  disposed under the display panel  2031  when the display  2000  is viewed from above. According to another embodiment, the transmission area A1 may be formed to have a higher transmittance than the peripheral active area A2. For example, the transmission area A1 may be formed to have a transmittance in a range of 5% to 20% by rearrangement of a plurality of pixels and/or wires in the display panel  2031 . According to various embodiments, the transmission area A1 may include an opaque layer (e.g., the opaque layer  2060  in  FIG.  17 C ) including a plurality of openings (e.g., the openings  2061  in  FIG.  17 C ) formed under the display panel  2031 . According to an embodiment, the transmittance of the transmission area A1 may be determined by adjusting at least one of the shapes, sizes, arrangement density, and/or arrangement intervals of the plurality of openings  2061  included in the opaque layer  2060 . 
       FIG.  17 C  is an enlarged view of another area of an electronic device according to an embodiment of the disclosure. The another area of electronic device may refer to the area B shown in  FIG.  17 B . 
     Referring to  FIG.  17 C , the display panel  2031  may include a substrate layer  2031   a , an intermediate layer  2031   b  stacked on the substrate layer  2031   a , and an encap layer  2031   c  stacked on the intermediate layer  2031   b . In an embodiment, the display panel  2031  may include a plurality of pixels P in which a first sub-pixel region (Pr: pixel red), a second sub-pixel region (Pg: pixel green), and a third sub-pixel region (Pb: pixel blue) are defined as one pixel P. According to an embodiment, the area in which the plurality of pixels P are disposed may correspond to the active area of the display panel  2031 . 
     According to various embodiments, the display panel  2031  may include a first pixel electrode  20311   a , a second pixel electrode  20311   b , and a third pixel electrode  20311   c  disposed on the substrate layer  2031   a  so as to correspond to the first sub-pixel region Pr, the second sub-pixel region Pg, and the third sub-pixel region Pb in the intermediate layer  2031   b . In an embodiment, the display panel  2031  may include a first organic material layer  20312   a , a second organic material layer  20312   b , and a third organic material layer  20312   c  disposed on the first pixel electrode  20311   a , the second pixel electrode  20311   b , and the third pixel electrode  20311   c , respectively, in the intermediate layer  2031   b . In another embodiment, the first sub-pixel region Pr, the second sub-pixel region Pg, and the third sub-pixel region Pb may be partitioned by pixel defining layers  20314  made of an insulating material. A counter electrode  20313  may be commonly disposed on the first organic material layer  20312   a , the second organic material layer  20312   b , and the third organic material layer  20312   c . In yet another embodiment, the first pixel electrode  20311   a , the second pixel electrode  20311   b , and the third pixel electrode  20311   c  may include a reflective electrode including a reflective layer. 
     According to various embodiments, the first organic material layer  20312   a , the second organic material layer  20312   b , and the third organic material layer  20312   c  may include organic light-emitting layers emitting light of a first color, light of a second color, and light of a third color, respectively. According to an embodiment, the organic light-emitting layer may be disposed between a pair of common layers that are vertically stacked. According to another embodiment, one common layer may include a hole injection layer (HIL) and/or a hole transport layer (HTL). According to yet another embodiment, the remaining one common layer may include an electron transport layer (ETL) and/or an electron injection layer (EIL). According to other embodiments, the pair of common layers may include an organic light-emitting layer and may further include various functional layers. In an embodiment, the first color, the second color, and the third color may include red, green, and blue, respectively. In another embodiment, in order for the organic light-emitting layer to emit white light, a combination of various colors may be used in addition to a combination of red, green, and blue. 
     According to various embodiments, the counter electrode  20313  may be configured as a transparent or translucent electrode, may include one or more materials selected from silver (Ag), aluminum (Al), magnesium (Mg), lithium (Li), calcium (Ca), copper (Cu), LiF/Ca, LiF/Al, MgAg, and CaAg, and may be formed as a thin film having a thickness of several to several tens of mm. According to an embodiment, light emitted from the first organic light-emitting layer, the second organic light-emitting layer, and the third organic light-emitting layer respectively included in the first organic material layer  20312   a , the second organic material layer  20312   b , and the third organic material layer  20312   c  may travel toward the counter electrode  20313  directly or by being reflected from the first pixel electrode  20311   a , the second pixel electrode  20311   b , and the third pixel electrode  20311   c.    
     According to various embodiments, the substrate layer  2031   a  may include an electrical connection member electrically connected to each of the first pixel electrode  20311   a , the second pixel electrode  20311   b , and the third pixel electrode  20311   c . In an embodiment, the electrical connection member may include a thin film transistor (TFT) or a low-temperature passivation transistor (LTPS). In another embodiment, the protective layer  2031   c  may be disposed on the counter electrode  20313  to protect the counter electrode  20313 . According to various embodiments, the display panel  2031  may further include a base layer disposed below the substrate layer  2031   a . In yet another embodiment, the substrate layer  2031   a  and/or the base layer may include a transparent insulating substrate. The substrate layer  2031   a  and/or the base layer may be formed of a glass substrate, a quartz substrate, or a transparent resin substrate. The transparent resin substrate may include a polyimide-based resin, an acryl-based resin, a polyacrylate-based resin, a polycarbonate-based resin, a polyether-based resin, a sulfonic acid-based resin, or a polyethyleneterephthalate-based resin. 
     According to various embodiments, the display panel  2031  may include a plurality of pixels P that are rearranged in the intermediate layer  2031   b  between the substrate layer  2031   a  and the protective layer  2031   c  corresponding to the transmission area A1 to have a lower arrangement density than the peripheral active area A2. In this case, the intermediate layer  2031   b  corresponding to the transmission area A1 may remain or may be removed. According to an embodiment, the display panel  2031  may include an opaque layer  2060  disposed under (e.g., on the rear surface) of the display panel  2031  so as to correspond to the transmission area A1. According to another embodiment, the opaque layer  2060  may include a colored (e.g., black) metal layer. In various embodiments, at least a portion of the opaque layer  2060  may be disposed in a boundary area between the transmission area A1 and the peripheral active area A2. According to yet another embodiment, the metal layer may be formed on the rear surface of the display panel  2031  through a deposition process. According to still another embodiment, the opaque layer  2060  may include a plurality of openings  2061 , and transmittance of the transmission area A1 may be determined by adjusting the shapes, sizes, arrangement density, and/or arrangement intervals of the plurality of openings  2061 . In an embodiment, the plurality of openings  2061  may be formed to have the same or different shapes, sizes, arrangement structures, and/or arrangement intervals. In another embodiment, in the transmission area A1, a plurality of pixels P and/or a plurality of wires included in the display panel  2031  may be disposed to overlap an area (e.g., a non-transmission area) where a plurality of openings  2061  is not formed when the display panel  2031  is viewed from above. According to another embodiment, in the transmission area A1, the plurality of pixels P and/or the plurality of wires may be disposed to at least partially overlap the plurality of openings  2061  when the display panel  2031  is viewed from above. 
     According to various embodiments, the display panel  2031  may have a transmittance corresponding to a pixel arrangement density in the range of about 100 ppi (pixel per inch) to 300 ppi through the plurality of openings  2061  in the transmission area A1. According to an embodiment, the display panel  2031  may have, in the transmission area A1, a transmittance that exceeds the transmittance of the peripheral active area A2 through the plurality of openings  2061  and equal to or less than a transmittance corresponding to the pixel arrangement density at which one pixel is disposed in an area where 16 pixels are to be disposed. According to another embodiment, the display panel  2031  may have, in the transmission area A1, a transmittance corresponding to the pixel arrangement density at which one pixel is disposed in an area where four pixels are to be disposed through the plurality of openings  2061 . According to yet another embodiment, the display panel  2031  may be configured, in the transmission area A1, such that a ratio of a transmission area formed through the plurality of openings  2061  to a non-transmission area formed by the opaque layer  2060  (e.g., transmission area/non-transmission area) includes a range of about 1 to 500. 
     Hereinafter, another example of an electronic device structure to which various embodiments of the disclosure may be applied will described with reference to  FIGS.  18 A,  18 B, and  18 C . 
       FIG.  18 A  is a diagram illustrating a closed state of an electronic device according to an embodiment of the disclosure, and  FIG.  18 B  is a diagram illustrating an open state of an electronic device according to an embodiment of the disclosure. 
     Referring to  FIGS.  18 A and  18 B , an electronic device  2200  may have a closed state in which a first structure  2201  is closed with respect to a second structure  2202  or have an open state in which the first structure  2201  is open with respect to the second structure  2202 . In an embodiment, the electronic device  2200  may include a first structure  2201  and a second structure  2202  movably disposed in the first structure  2201 . In various embodiments, the first structure  2201  may be disposed to slide on the second structure  2202 . According to an embodiment, the first structure  2201  may be disposed to reciprocate by a predetermined distance in the illustrated direction {circle around (1)} relative to the second structure  2202 . 
     According to various embodiments, the first structure  2201  may be referred to as a first housing, a slide part, or a slide housing, and may be disposed to reciprocate on the second structure  2202 . In other embodiments, the second structure  2202  may be referred to as a second housing, a main part, or a main housing, and may accommodate various electronic components such as a main circuit board or a battery. A portion (e.g., the first region A1) of the display  2203  may be seated on the first structure  2201 . Another part (e.g., the second region A2) of the display  2203  may be received inside the second structure  2202  (e.g., a slide-in operation) or exposed to the outside of the second structure  2202  (e.g., a slide-out operation) as the first structure  2201  moves (e.g., slides) relative to the second structure  2202 . 
     According to various embodiments, the first structure  2201  may include a first plate  2211   a  (e.g., a slide plate) and include a first surface (e.g., F1 in  FIG.  18 C ) formed to include at least a portion of the first plate  2211   a  and a second surface F2 facing in the opposite direction of the first surface F1. In an embodiment, the second structure  2202  may include a second plate (e.g.,  2221   a  in  FIG.  18 C ) (e.g., a rear case), a first side wall  2223   a  extending from the second plate  2221   a , a second side wall  2223   b  extending from the first side wall  2223   a  and the second plate  2221   a , a third side wall  2223   c  extending from the first side wall  2223   a  and the second plate  2221   a  and parallel to the second side wall  2223   b , and a rear plate  2221   b  (e.g., a rear window). In other embodiments, the second side wall  2223   b  and the third side wall  2223   c  may be formed perpendicular to the first side wall  2223   a . In another embodiment, the second plate  2221   a , the first side wall  2223   a , the second side wall  2223   b , and the third side wall  2223   c  may be formed such that one side (e.g., a front face) of the second structure  2202  is open to receive (or enclose) at least a portion of the first structure  2201 . For example, the first structure  2201  may be coupled to the second structure  2202  so as to be at least partially enclosed thereby, thereby sliding in a direction parallel to the first surface F1 or the second surface F2, for example, in the direction {circle around (1)}), while being guided by the second structure  2202 . 
     According to various embodiments, the second side wall  2223   b  or the third side wall  2223   c  may be omitted. In an embodiment, the second plate  2221   a , the first side wall  2223   a , the second side wall  2223   b , and/or the third side wall  2223   c  may be formed in separate structures and then coupled or assembled with each other. In another embodiment, the rear plate  2221   b  may be coupled to enclose at least a portion of the second plate  2221   a . In various embodiments, the rear plate  2221   b  may be formed to be substantially integral with the second plate  2221   a . In yet another embodiment, the second plate  2221   a  or the rear plate  2221   b  may cover at least a portion of the flexible display  2203 . The flexible display  2203  may be at least partially received inside the second structure  2202 , and the second plate  2221   a  or the rear plate  2221   b  may cover a portion of the flexible display  2203  received inside the second structure  2202 . 
     According to various embodiments, the first structure  2201  may move in a first direction (e.g., the direction CO parallel to the second plate  2221   a  and the second side wall  2223   b  relative to the second structure  2202  between an open state and a closed state such that the first structure  2201  is placed at a first distance from the first side wall  2223   a  in the closed state and such that the first structure  2201  is placed at a second distance, which is greater than the first distance, from the first side wall  2223   a  in the open state. In other embodiments, the first structure  2201  may be positioned to enclose a portion of the first side wall  2223   a  in the closed state. 
     According to various embodiments, the electronic device  2200  may include at least one of a display  2203  (e.g., a flexible display), a key input device  2241 , a connector hole  2243 , audio modules  2245   a ,  2245   b ,  2247   a , and  2247   b , and a camera module  2249 . Although not shown, the electronic device  2200  may further include an indicator (e.g., an LED device) or various sensor modules. 
     According to various embodiments, the display  2203  may include a first region A1 and a second region A2. In an embodiment, the first region A1 may be disposed on the first surface F1 so as to extend substantially across at least a portion of the first surface F1. The second region A2 may extend from the first region A1 and may be inserted or received inside the second structure  2202  or exposed to the outside of the second structure  2202  according to the sliding movement of the first structure  2201 . As will be described later, the second region A2 may move while being substantially guided by a roller (e.g.,  2251  in  FIG.  18 C ) mounted to the second structure  2202  so as to be received inside the second structure  2202  or exposed to the outside thereof. For example, while the first structure  2201  slides, a portion of the second region A2 may be deformed into a curved shape at a position corresponding to the roller  2251 . 
     According to other embodiments, if the first structure  2201  moves from the closed state to the open state, the second region A2 of the display  2203  may be gradually exposed to the outside of the second structure  2202  to form substantially a plane together with the first region A1 when viewed from above of the first plate  2211   a . In an embodiment, the display  2203  may be connected to at least one of a touch sensing circuit, a pressure sensor capable of measuring the intensity (pressure) of a touch, and/or a digitizer detecting a magnetic-field type stylus pen or may be disposed adjacent thereto. In an embodiment, the second region A2 of the display  2203  may be at least partially received inside the second structure  2202 , and a portion of the second region A2 may be exposed to the outside even in the closed state of the electronic device  2200 . In various embodiments, a portion of the exposed second region A2 may be position on the roller  2251 , irrespective of the closed state or open state of the electronic device  2200 , so that a portion of the second region A2 may maintain a curved shape at a position corresponding to the roller  2251 . 
     In an embodiment, the key input device  2241  may be disposed on the second side wall  2223   b  or the third side wall  2223   c  of the second structure  2202 . In another embodiment, the key input device  2241  may be excluded from the electronic device  2200  or at least one key input device may be further included depending on the appearance of the electronic device  2200  or the state of using the electronic device  2200 . According to various embodiments, the electronic device  2200  may include a key input device that is not shown, for example, a home key button or a touch pad disposed around the home key button. According to another embodiment, at least a part of the key input device  2241  may be disposed to be located in one area of the first structure  2201 . 
     According to various embodiments, the connector hole  2243  may be omitted depending on the embodiment and receive a connector (e.g., a USB connector) for transmitting and receiving power and/or data to and from an external electronic device. Although not shown, the electronic device  2200  may include a plurality of connector holes  2243 , and some of the plurality of connector holes  2243  may function as connector holes for transmitting and receiving audio signals to and from an external electronic device. Although the connector hole  2243  is illustrated as being disposed on the third side wall  2223   c , the connector hole  2243  may be disposed on the first side wall  2223   a  or the second side wall  2223   b.    
     According to other embodiments, the audio modules  2245   a ,  2245   b ,  2247   a , and  2247   b  may include at least one of speaker holes  2245   a  and  2245   b  and microphone holes  2247   a  and  2247   b . One of the speaker holes  2245   a  and  2245   b  may function as a receiver hole for a voice call, and the other may function as an external speaker hole. A microphone for obtaining an external sound may be disposed inside the microphone holes  2247   a  and  2247   b , and a plurality of microphones may be disposed to detect the direction of sound in various embodiments. In various embodiments, the speaker holes  2245   a  and  2245   b  and the microphone holes  2247   a  and  2247   b  may be implemented as a single hole, or a speaker (e.g., a piezo speaker) may be provided without the speaker holes  2245   a  and  2245   b . According to an embodiment, some speaker holes  2245   a  (e.g., a receiver hole for a voice call) may be disposed in the first structure  2201 , and other speaker holes  2245   b  or microphone holes  2247   a  and  2247   b  may be disposed in the second structure  2202  (e.g., one of the side surfaces  2223   a ,  2223   b , and  2223   c ). 
     In an embodiment, the camera module  2249  may be provided in the second structure  2202  and may photograph a subject in the opposite direction of the first region A1 of the display  2203 . The electronic device  2200  may include a plurality of camera modules  2249 . For example, the electronic device  2200  may include a wide-angle camera, a telephoto camera, or a close-up camera, and according to an embodiment, the electronic device  200  may further include at least one of an infrared projector and at least a receiver to measure the distance to the subject. In another embodiment, the camera module  2249  may include at least one of one or more lenses, an image sensor, and an image signal processor. Although not shown, according to various embodiments, the electronic device  2200  may further include a camera module (e.g., a front camera) for photographing a subject in the opposite direction of the first region A1 of the display  2203 . The front camera may be disposed around the first region (A1) or in an area overlapping the display  2203  and may photograph a subject by passing through the display  2203  in the case where it is disposed in the area overlapping the display  2203 . 
     According to various embodiments, an indicator (not shown) of the electronic device  2200  may be disposed in the first structure  2201  or the second structure  2202  and include a light-emitting diode to provide state information of the electronic device  2200  using a visual signal. A sensor module (not shown) of the electronic device  2200  may produce an electrical signal or data value corresponding to an internal operating state of the electronic device  2200  or an external environmental state of the electronic device  2200 . The sensor module may include, for example, at least one of a proximity sensor, a fingerprint sensor, and a biometric sensor (e.g., an iris recognition sensor, a face recognition sensor, and an HRM sensor). Alternatively, the sensor module may further 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 infrared (IR) sensor, a temperature sensor, a humidity sensor, and an illuminance sensor. 
       FIG.  18 C  is an exploded view of an electronic device according to an embodiment of the disclosure. 
     Referring to  FIG.  18 C , an electronic device  2200  may include at least one of a first structure  2201 , a second structure  2202  (e.g., a housing), a display  2203  (e.g., a flexible display), and a guide member (e.g., a roller  2251 ), a support sheet  2253 , and a multi-joint hinge structure  2213 . A portion (e.g., a second region A2) of the display  2203  may be received inside the second structure  2202  while being guided by the roller  2251 . According to various embodiments, the first structure  2201  may include at least one of a first plate  2211   a  (e.g., a slide plate), a first bracket  2211   b  mounted to the first plate  2211   a , and a second bracket  2211   c . At least one of the first plate  2211   a , the first bracket  2211   b , and the second bracket  2211   c  may be formed of a metal material or a non-metal material (e.g., polymer). The first plate  2211   a  may be mounted to the second structure  2202  and may reciprocate linearly in one direction (e.g., the direction {circle around (1)} in  FIGS.  18 A and  18 B ) while being guided by the second structure  2202 . In an embodiment, the first bracket  2211   b  may be coupled to the first plate  2211   a  to form a first surface F1 of the first structure  2201  together with the first plate  2211   a . A first region A1 of the display  2203  may be substantially mounted on the first surface F1 so as to remain flat. The second bracket  2211   c  may be coupled to the first plate  2211   a  to form a second surface F2 of the first structure  2201  together with the first plate  2211   a . According to an embodiment, at least one of the first bracket  2211   b  and the second bracket  2211   c  may be integrally formed with the first plate  2211   a . The first structure  2201  or the first plate  2211   a  may be coupled to the second structure  2202  to slide relative to the second structure  2202 . 
     According to various embodiments, the multi-joint hinge structure  2213  may include a plurality of bars or rods and may be connected to one end of the first structure  2201 . For example, as the first structure  2201  slides, the multi-joint hinge structure  2213  may move relative to the second structure  2202  to be substantially received inside the second structure  2202  in a closed state (e.g., the state of the electronic device  2200  in  FIG.  18 A ). According to other embodiments, even if the electronic device  2200  is in the closed state, a part of the multi-joint hinge structure  2213  may not be received inside the second structure  2202 . For example, even in the closed state of the electronic device  2200 , a part of the multi-joint hinge structure  2213  may be positioned outside the second structure  2202  so as to correspond to the roller  2251 . The plurality of rods may extend in a straight line to be disposed parallel to a rotation axis R of the roller  2251 , and may be arranged along a direction perpendicular to the rotation axis R (e.g., a direction in which the first structure  2201  slides). 
     According to still other embodiments, the plurality of rods may rotate around other rods adjacent thereto while remaining parallel to the other adjacent rods. Based on this, as the first structure  2201  slides, the plurality of rods may be arranged to form a curved surface or may be arranged to form a flat surface. As the first structure  2201  slides, the multi-joint hinge structure  2213  may form a curved surface at a portion facing the roller  2251  and form a flat surface at a portion not facing the roller  2251 . In an embodiment, the second region A2 of the display  2203  may be mounted or supported on the multi-joint hinge structure  2213  and exposed to the outside of the second structure  2202  together with the first region A1 in an open state (e.g., the state of the electronic device  2200  in  FIG.  18 B ). In the state in which the second region A2 is exposed to the outside of the second structure  2202 , the multi-joint hinge structure  2213  may form substantially a flat surface, thereby supporting or maintaining the second region A2 in a flat state. 
     According to other embodiments, the second structure  2202  (e.g., a housing) may include a second plate  2221   a  (e.g., a rear case), a printed circuit board (not shown), a rear plate  2221   b , and a third plate  2221   c  (e.g., a front case), and a support member  2221   d . In an embodiment, the second plate  2221   a  may be disposed in the opposite direction of the first surface F1 of the first plate  2211   a  and may substantially form the appearance of the second structure  2202  or the electronic device  2200 . In another embodiment, the second structure  2202  may include a first side wall  2223   a  extending from the second plate  2221   a , a second side wall  2223   b  extending from the second plate  2221   a  to be substantially perpendicular to the first side wall  2223   a , and a third side wall  2223   c  extending from the second plate  2221   a  to be substantially perpendicular to the first side wall  2223   a  and parallel to the second side wall  2223   b . In an embodiment, at least one of the second side wall  2223   b  and the third side wall  2223   c  may be manufactured as a separate component and mounted or assembled to the second plate  2221   a . In another embodiment, at least one of the second side wall  2223   b  and the third side wall  2223   c  may be integrally formed with the second plate  2221   a . The second structure  2202  may accommodate an antenna for proximity wireless communication, an antenna for wireless charging, or an antenna for magnetic secure transmission (MST) in a space that does not overlap the multi-joint hinge structure  2213 . 
     According to various embodiments, the rear plate  2221   b  may be coupled to the outer surface of the second plate  2221   a  or may be formed integrally with the second plate  2221   a . In an embodiment, the second plate  2221   a  may be formed of a metal or a polymer material, and the rear plate  2221   b  may be formed of a material such as metal, glass, synthetic resin, or ceramic, thereby providing a decorative effect for the exterior of the electronic device  2200 . In an embodiment, at least one of the second plate  2221   a  and the rear plate  2221   b  may be formed of a material that at least partially transmits light. Based on this, in the state in which a portion (e.g., the second region A2) of the display  2203  is received inside the second structure  2202 , the electronic device  2200  may output visual information using the portion (e.g., an auxiliary display area) of the received display  2203 , which is received inside the second structure  2202 . The portion (e.g., an auxiliary display area) of the display  2203  may output visual information and provide the same to the outside of the second structure  2202  while being received inside the second structure  2202 . 
     According to various embodiments, the third plate  2221   c  may be formed of a metal or polymer material and coupled to at least one of the second plate  2221   a  (e.g., a rear case), the first side wall  2223   a , the second side wall  2223   b , and the third side wall  2223   c  to form an inner space of the second structure  2202 . In various embodiments, the third plate  2221   c  may be referred to as a front case, and the first plate  2211   a  of the first structure  2201  may slide while substantially facing the third plate  2221   c . In other embodiments, the first side wall  2223   a  may be configured as a combination of a first side wall portion  2223   a - 1  extending from the second plate  2221   a  and a second side wall portion  2223   a - 2  formed on one edge of the third plate  2221   c . In another embodiment, the first side wall portion  2223   a - 1  may be coupled to surround one edge of the third plate  2221   c , for example, the second side wall portion  2223   a - 2 , and in this case, the first side wall portion  2223   a - 1  itself may form the first side wall  2223   a.    
     According to various embodiments, the support member  2221   d  may be disposed in the space between the second plate  2221   a  and the third plate  2221   c  and have a planar shape formed of a metal or polymer material. The support member  2221   d  may provide an electromagnetic shielding structure in the inner space of the second structure  2202  or improve the mechanical rigidity of the second structure  2202 . In an embodiment, the multi-joint hinge structure  2213  and a partial area (e.g., the second region A2) of the display  2203 , when received inside the second structure  2202 , may be positioned in the space between the second plate  2221   a  and the support member  2221   d . According to other embodiments, the printed circuit board (not shown) may be disposed in the space between the third plate  2221   c  and the support member  2221   d . The printed circuit board may be accommodated in a space inside the second structure  2202 , which is separated by the support member  2221   d  from the space in which the multi-joint hinge structure  2213  and/or a partial area of the display  2203  is received. At least one of a processor, a memory, and an interface may be disposed on the printed circuit board. The interface may include, for example, at least one of a high-definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, and an audio interface. 
     According to still other embodiments, the display  2203  may include a flexible display based on an organic light-emitting diode and may be at least partially deformed into a curved shape while maintaining a generally planar shape. In an embodiment, the first region A1 of the display  2203  may be mounted or attached to the first surface F1 of the first structure  2201  to have a substantially flat shape. The second region A2 of the display  2203  may extend from the first region A1 to be supported or attached to the multi-joint hinge structure  2213 . For example, the second region A2 of the display  2203  may extend along the sliding movement direction of the first structure  2201  and may be received inside the second structure  2202  together with the multi-joint hinge structure  2213  so as to be at least partially deformed to a curved shape according to the deformation of the multi-joint hinge structure  2213 . 
     According to various embodiments, as the first structure  2201  slides on the second structure  2202 , the area of the display  2203  exposed to the outside may vary. The electronic device  2200  (or the processor) may change the region of the display  2203  to be activated based on the area of the display  2203  exposed to the outside. For example, in an open state or in an intermediate state between a closed state and an open state, the electronic device  2200  may activate a region of the second structure  2202  exposed to the outside among the total area of the display  2203 . As another example, in the closed state, the electronic device  2200  may activate the first region A1 of the display  2203  and deactivate the second region A2. According to other embodiments, in the closed state, if there is no user input for a specified time (e.g., 30 seconds or 2 minutes), the electronic device  2200  may deactivate the entire region of the display  2203 . According to still other embodiments, in the state in which the entire region of the display  2203  is inactive, the electronic device  2200  may provide visual information through a partial area (e.g., the auxiliary display area corresponding to a portion of the second plate  2221   a  and/or rear plate  2221   b  made of a material that transmits light) of the display  2203  depending on a situation (e.g., a notification according to configuration by a user, a missed call notification, or a message arrival notification). 
     According to various embodiments, in the open state of the electronic device  2200 , substantially the entire area (e.g., the first region A1 and the second region A2) of the display  2203  may be exposed to the outside, and the region first A1 and the second region A2 may be disposed to form a plane. In an embodiment, even if the electronic device  2200  is in the open state, a portion (e.g., one end) of the second region A2 may be positioned to correspond to the roller  2251 , and the portion of the second region A2 corresponding to the roller  2251  may remain in a curved shape. 
     According to other embodiments, the roller  2251  (e.g., a guide member) may be rotatably mounted to the second structure  2202  at a position adjacent to one edge of the second structure  2202  (e.g., the second plate  2221   a ). The roller  2251  may be disposed adjacent to the edge IE of the second plate  2221   a  parallel to the first side wall  2223   a . According to various embodiments, another side wall may extend from the edge IE of the second plate  2221   a  adjacent to the roller  2251 , and the another side wall adjacent to the roller  2251  may be substantially parallel to the side wall  2223   a . In various embodiments, the side wall of the second structure  2202  adjacent to the roller  2251  may be formed of a material that transmits light, and a portion of the second region A2 may provide visual information by passing through the portion of the second structure  2202  while being received in the second structure  2202 . 
     According to still other embodiments, one end of the roller  2251  may be rotatably coupled to the second side wall  2223   b  and the opposite end thereof may be rotatably coupled to the third side wall  2223   c . For example, the roller  2251  may be mounted to the second structure  2202  so as to rotate about the rotation axis R perpendicular to the sliding movement direction of the first structure  2201  (e.g., the direction {circle around (1)} in  FIG.  18 A or  18 B ). For example, the rotation axis R may be formed on one edge of the second plate  2221   a  so as to be substantially parallel to the first side wall  2223   a  but spaced apart from the first side wall  2223   a . In an embodiment, the gap between the outer circumferential surface of the roller  2251  and the inner surface of the edge of the second plate  2221   a  may form an entrance through which the multi-joint hinge structure  2213  or the display  2203  enter the second structure  2202 . 
     According to various embodiments, when the display  2203  is deformed into a curved shape, the roller  2251  may maintain the radius of curvature of the display  2203  to a certain degree, thereby suppressing excessive deformation of the display  2203 . The excessive deformation may indicate that the display  2203  is deformed to have a small radius of curvature enough to damage pixels or signal wires included in the display  2203 . The display  2203  may be moved or deformed while being guided by the roller  2251  and may be protected from damage due to the excessive deformation. In various embodiments, the roller  2251  may rotate while the multi-joint hinge structure  2213  or the display  2203  is inserted into the second structure  2202  or drawn out thereof. For example, the roller  2251  may suppress friction between the multi-joint hinge structure  2213  (or the display  2203 ) and the second structure  2202 , thereby facilitating the multi-joint hinge structure  2213  (or the display  2203 ) to be inserted into the second structure  2202  or drawn out thereof. 
     According to other embodiments, the support sheet  2253  may be formed to include a material having flexibility and a certain degree of elasticity, for example, at least one of silicone and rubber, and may be mounted or attached to the roller  2251  so as to be selectively wound around the roller  2251  according to the rotation of the roller  2251 . In the illustrated embodiment, a plurality of (e.g., four) support sheets  2253  may be arranged along the direction of the rotation axis R of the roller  2251 . The plurality of support sheets may be mounted to the roller  2251  at predetermined intervals between each other and may extend in a direction perpendicular to the rotation axis R of the roller  2251 . In another embodiment, one support sheet may be mounted or attached to the roller  2251 . For example, the one support sheet may have a size and a shape capable of covering the disposition region of the illustrated plurality of (e.g., four) support sheets and areas between the plurality of support sheets. In various embodiments, the quantity, sizes, or shapes of the support sheets  2253  may be varied as appropriate. In other embodiments, the support sheet  2253  may be rolled around the outer circumferential surface of the roller  2251  or unrolled from the roller  2251  to a flat shape between the display  2203  and the third plate  2221   c  according to the rotation of the roller  2251 . In various embodiments, the support sheet  2253  may be referred to as a support belt, an auxiliary belt, a support film, or an auxiliary film. 
     According to still other embodiments, an end of the support sheet  2253  may be connected to the first structure  2201 , for example, the first plate  2211   a  (e.g., a slide plate) of the first structure  2201 , and may be wound around the roller  2251  in the closed state of the electronic device  2200  (e.g., the state of the electronic device  2200  in  FIG.  18 A ). Based on this, as the first plate  2211   a  moves according to the open state of the electronic device  2200  (e.g., the state of the electronic device  2200  in  FIG.  18 B ), the support sheet  2253  may be gradually positioned between the second structure  2202  (e.g., the third plate  2221   c ) and the display  2203  (e.g., the second region A2) or between the second structure  2202  (e.g., the third plate  2221   c ) and the multi-joint hinge structure  2213 . At least a portion of the support sheet  2253  may be positioned to face the multi-joint hinge structure  2213  and selectively wound around the roller  2251  according to the sliding movement of the first plate  2211   a . In various embodiments, the support sheet  2253  may be generally disposed in contact with the multi-joint hinge structure  2213 , but the portion thereof wound around the roller  2251  may be substantially separated from the multi-joint hinge structure  2213 . 
     According to various embodiments, the distance between the surface of the display  2203  and the inner surface of the edge of the second plate  2221   a  may vary depending on the degree to which the support sheet  2253  is wound around the roller  2251 . As the distance between the surface of the display  2203  and the inner surface of the edge of the second plate  2221   a  is reduced, foreign substances may be prevented from entering therethrough, but if the distance is too small, the display  2203  and the second plate  2221   a  may come into contact with or rub against each other. If the display  2203  and the second plate  2221   a  come into contact with or rub against each other, the surface of the display  2203  may be damaged or the sliding operation of the first structure  2201  may be hindered. 
     According to other embodiments, as the support sheet  2253  is wound around the roller  2251  in the closed state of the electronic device  2200  (e.g., the state of the electronic device  2200  in  FIG.  18 A ), the distance between the surface of the display  2203  and the inner surface of the edge of the second plate  2221   a  may be reduced while the surface of the display  2203  is not in contact with the second plate  2221   a . For example, as the distance between the surface of the display  2203  and the inner surface of the edge of the second plate  2221   a  is reduced, foreign substances may be prevented from flowing into the second structure  2202 . In an embodiment, if the electronic device  2200  switches to the open state, the support sheet  2253  may gradually move from the roller  2251  to the space between the second structure  2202  (e.g., the second plate  2221   a  or the third plate  2221   c ) and the multi-joint hinge structure  2213  according to the movement of the first structure  2201  (e.g., the first plate  2211   a ). For example, as the first structure  2201  moves, the distance between the surface of the display  2203  and the inner surface of the edge of the second plate  2221   a  may gradually increase, thereby suppressing friction or contact between the display  2203  and other structures (e.g., the second plate  2221   a ) and preventing the surface of the display  2203  from being damaged according thereto. In still other embodiments, the support sheet  2253  may gradually increase in thickness thereof from one end (e.g., the portion fixed to the roller  2251 ) to the other end (e.g., the portion fixed to the first plate  2211   a ). Using the thickness profile of the support sheet  2253 , the distance between the surface of the display  2203  and the inner surface of the edge of the second plate  2221   a  may be adjusted in the closed state and the open state of the electronic device  2200 . 
     According to various embodiments, the electronic device  2200  may include one or more elastic members  131  and  133  (e.g., a low-density elastic body (sponge) or brush). The electronic device  2200  may include a first elastic member  131  mounted to one end of the display  2203 , and further include a second elastic member  2233  mounted to the inner surface of the edge of the second plate  2221   a  according to an embodiment. The first elastic member  2231  may be substantially disposed in the inner space of the second structure  2202  and positioned to correspond to the edge of the second plate  2221   a  in the open state of the electronic device  2200 . In an embodiment, the first elastic member  2231  may move in the inner space of the second structure  2202  according to the sliding movement of the first structure  2201 . In an embodiment, if the first structure  2201  moves according to switching of the electronic device  2200  from the closed state to the open state, the first elastic member  2231  may move toward the edge of the second plate  2221   a . In a situation in which the electronic device  2200  switches to the open state, the first elastic member  2231  may come into contact with the inner surface of the edge of the second plate  2221   a . For example, in the open state of the electronic device  2200 , the first elastic member  2231  may seal the gap between the inner surface of the edge of the second plate  2221   a  and the surface of the display  2203 . In another embodiment, if the first structure  2201  moves according to switching of the electronic device  2200  from the closed state to the open state, the first elastic member  2231  may move while being in contact with the second plate  2221   a . In this case, if a foreign substance is introduced into the gap between the second region A2 and the second plate  2221   a  of the display  2203  in the closed state of the electronic device  2200 , the first elastic member  2231  may discharge the foreign substance to the outside of the second structure  2202  when the electronic device  2200  switches to the open state. 
     According to other embodiments, the second elastic member  2233  may be attached to the inner surface of the edge of the second plate  2221   a  and disposed to substantially face the inner surface of the display  2203 . In the closed state of the electronic device  2200 , the distance between the surface of the display  2203  and the inner surface of the edge of the second plate  2221   a  may be substantially determined by the second elastic member  2233 . In an embodiment, in the closed state of the electronic device  2200 , the second elastic member  2233  may come into contact with the surface of the display  2203 , thereby substantially sealing the gap between the surface of the display  2203  and the inner surface of the edge of the second plate  2221   a . Since the second elastic member  2233  may be formed of a low-density elastic body (e.g., a sponge) or brush, it may not damage the surface of the display  2203  even in direct contact with the display  2203 . In another embodiment, as the first structure  2201  moves when the electronic device  2200  switches to the open state, the distance between the surface of the display  2203  and the inner surface of the edge of the second plate  2221   a  may be increased. For example, the second region A2 of the display  2203  may be gradually exposed to the outside of the second structure  2202  while the display  2203  does not substantially come into contact with or rub against the second elastic member  2233 . In an embodiment, when the electronic device  2200  is in the open state, the first elastic member  2231  may come into contact with the second elastic member  2233 . For example, the first elastic member  2231  and the second elastic member  2233  that are in contact with each other in the open state of the electronic device  2200  may seal the gap between the surface of the display  2203  and the inner surface of the edge of the second plate  2221   a , thereby blocking inflow of foreign substances. 
     According to still other embodiments, the electronic device  2200  may further include at least one of a guide rail  2255  and an actuating member  2257 . The guide rail  2255  may be mounted to the second structure  2202 , for example, the third plate  2221   c , to guide the sliding movement of the first structure  2201  (e.g., the first plate  2211   a ). The actuating member  2257  may include a spring or a spring module that provides an elastic force in a direction in which both ends of the actuating member  2257  go far away from each other. In an embodiment, one end of the actuating member  2257  may be rotatably supported by the second structure  2202 , and the opposite end thereof may be rotatably supported by the first structure  2201 . According to various embodiments, when the first structure  2201  slides, both ends of the actuating member  2257  may be located closest to each other (hereinafter, referred to as a closest point) at one section between the closed state and the open state of the electronic device  2200 . In a section between the closest point and the closed state of the electronic device  2200 , the actuating member  2257  may provide an elastic force to the first structure  2201  in a direction of moving toward the closed state, and in a section between the closest point and the open state of the electronic device  2200 , the actuating member  2257  may provide an elastic force to the first structure  2201  in a direction of moving toward the open state. 
       FIGS.  19 A and  19 B  are diagrams illustrating various regions of a display device when the electronic device switches from a closed state to an open state according to various embodiments of the disclosure. 
     Various operations of the electronic device described with reference to  FIGS.  19 A and  19 B  may be sequentially performed subsequent to operation  405  described above with reference to  FIG.  4   . If it is determined that a first brightness level identified for a first region of the display device exceeds a specified threshold (e.g., the maximum brightness level capable of being covered by at least one second region) and if a second brightness level to be configured for at least one second region (e.g., the maximum brightness level capable of being covered by at least one second region or a brightness level lowered by a specified level from the maximum brightness level) is determined, the electronic device may identify a third region according to the following embodiment. 
     Referring to  FIGS.  19 A and  19 B , a processor (e.g.,  120  in  FIG.  1   ) of an electronic device  2200  according to various embodiments may identify a state of the electronic device  2200  in an operation of determining a third region  165   a  or  165   b  defined to include a portion of a first region  161   a  or  161   b  and at least one second region  163  of the display  2203 . For example, when determining the third region of the display  2203 , the processor  120  may determine whether the electronic device  2200  is operated while a first structure (e.g.,  2201  in  FIG.  18 A ) is in a closed state (a) with respect to a second structure (e.g.,  2202  in  FIG.  18 A ) or while the first structure  2201  is in an open state (b) with respect to second structure  2202 . 
     In an embodiment, if the electronic device  2200  is determined to be in the closed state (a), the processor  120 , based on the position of at least one second region  163  formed adjacent to at least one of an upper edge or a lower edge of the display  2203 , may determine a third region  165   a  defined to have a width including the at least one second region  163  in at least one of an upper edge region, a left edge region, a right edge region, and a lower edge region of the first region  161   a  (e.g., the region A1 in  FIG.  18 B ). Similarly, if the electronic device  2200  is determined to be in the open state (b), the processor  120  may determine a third region  165   b  having a width capable of covering at least one second region  163  in at least one of an upper edge region, a left edge region, a right edge region, and a lower edge region of the extended first region  161   b  (e.g., a combination of the region A1 and the region A2 in  FIG.  18 B ). According to the various embodiments described above, the width of the third region  165   a  or  165   b  may be determined to be the same or different from each other in at least one of the upper edge region, the left edge region, the right edge region, and the lower edge region of the first region  161   a  or  161   b , which is determined as the third region  165   a  or  165   b.    
     In another embodiment, after the determination of the third region  165   a  or  165   b  or after the brightness of at least one second region  163  and the third region  165   a  or  165   b  is configure as the second brightness level according to the determination of the third region  165   a  or  165   b , the processor  120  may monitor an event for switching the state of the electronic device  2200 . The processor  120  may identify an event for switching from the closed state to the open state of the electronic device  2200  or an event for switching from the open state to the closed state thereof. 
     In yet another embodiment, according to the occurrence of an event for switching the state of the electronic device  2200 , the processor  120  may change or adjust the third region  165   a  or  165   b  determined (or configured as the second brightness level). According to an embodiment, if the electronic device  2200  switches from the closed state (a) to the open state (b), a portion (e.g., the region A2 in  FIG.  18 B ) of the display  2203  may be exposed to the outside of the second structure  2202  while being guided by the roller (e.g.,  2251  in  FIG.  18 C ) mounted to the second structure  2202 , and accordingly, the first region  161   b  in the open state (b) may have an expanded area, compared to the first region  161   a  in the closed state (a). In response to the first region  161   b  extended in the open state (b), the processor  120  may change or adjust the third region  165   a  defined in at least one of the upper edge region, the left edge region (or the right edge region), and the lower edge region of the first region  161   a  in the closed state (a). The processor  120  may change or adjust the third region  165   a  defined in at least one of the upper edge region and the lower edge region of the first region  161   a  in the closed state (a) into to the third region  165   b  extending in the direction (e.g., the direction {circle around (1)} in  FIG.  18 A or  18 B ) in which the electronic device  2200  switches the state, and change or adjust the third region  165   a  defined in the left edge region (or the right edge region) of the first region  161   a  in the closed state (a) into to the third region  165   b  to be moved to the left edge region (or the right edge region) of the extended first region  161   b  in the open state (b). 
     According to yet another embodiment, if the electronic device  2200  switches from the open state (b) to the closed state (a), a portion (e.g., the region A2 in  FIG.  18 B ) of the display  2203  may be received inside the second structure  2202  while being guided by the roller (e.g.,  2251  in  FIG.  18 C ) mounted to the second structure  2202 , and accordingly, the first region  161   a  in the closed state (a) may have a reduced area compared to the first region  161   b  in open state (b). In response to the first region  161   a  reduced in the closed state (a), the processor  120  may change or adjust the third region  165   b  defined in at least one of the upper edge region, the left edge region (or the right edge region), and the lower edge region of the first region  161   b  in the open state (b). For example, the processor  120  may change or adjust the third region  165   b  defined in at least one of the upper edge region and the lower edge region of the first region  161   b  in the open state (b) into to the third region  165   a  reduced in the direction (e.g., the direction {circle around (1)} in  FIG.  18 A or  18 B ) in which the electronic device  2200  switches the state, and change or adjust the third region  165   b  defined in the left edge region (or the right edge region) of the first region  161   b  in the open state (b) into to the third region  165   a  to be moved to the left edge region (or the right edge region) of the reduced first region  161   a  in the closed state (a). 
     In an embodiment, the electronic device according to various embodiments may be one of various types of electronic devices. The electronic devices may include, for example, a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. According to an embodiment of the disclosure, the electronic devices are not limited to those described above. 
     It should be appreciated that various embodiments of the disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. With regard to the description of the drawings, similar reference numerals may be used to refer to similar or related elements. 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, each of such phrases as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and “at least one of A, B, or C,” may include any one of, or all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as “1st” and “2nd,” or “first” and “second” may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (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., wiredly), wirelessly, or via a third element. 
     As used herein, 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 embodiment, the module may be implemented in a form of an application-specific integrated circuit (ASIC). 
     Various embodiments as set forth herein may be implemented as software (e.g., the program  140 ) including one or more instructions that are stored in a storage medium (e.g., internal memory  136  or external memory  138 ) that is readable by a machine (e.g., the electronic device  101 ). For example, a processor (e.g., the processor  120 ) of the machine (e.g., the electronic device  101 ) may invoke at least one of the one or more instructions stored in the storage medium, and execute it, with or without using one or more other components under the control of the processor. 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 complier or a code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Wherein, 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 embodiment, a method according to various 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., smart phones) 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 embodiments, each component (e.g., a module or a program) of the above-described components may include a single entity or multiple entities. According to various 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 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 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. 
     While the disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents.