Patent Publication Number: US-2022223661-A1

Title: Electronic device comprising display

Description:
TECHNICAL FIELD 
     Various embodiments of the disclosure relate to an electronic device for improving screen quality. 
     BACKGROUND ART 
     Electronic devices are being provided in various forms such as a smart phone, a tablet Personal Computer (PC), and a Personal Digital Assistant (PDA), according to the development of digital technologies. Electronic devices are also being developed in a user wearable form in order to improve portability and a user&#39;s accessibility. 
     Electronic devices may include a display and may also be provided in a form of having a reduced bezel region around the display since a larger screen is preferred. In the outdoors with strong light or in a brightly lit space, the light reflected from the screen may be brighter than the image displayed on the display, and the image on the display may be dark and thus it may be difficult to accurately recognize the image. Accordingly, measures are being taken to ensure outdoor visibility that makes the display clear under natural light. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     A display may include a semiconductor element that serves as a kind of switch for controlling pixels. When sunlight enters the display, a photoelectric effect in which the semiconductor element absorbs light to generate photons occurs, which may cause leakage current from the semiconductor element. The leakage current from the semiconductor element, which responds to sunlight, causes a voltage drop across the pixels and hence an illuminance of the display decreases, which may degrade outdoor visibility. In some cases, there may be a difference between light reflectivities of respective regions of a display. Due to this, the leakage current may not be constant in the regions of the display, and the display may have deteriorated image quality due to difficulty in emitting light having a substantially uniform illuminance over the entire screen. 
     An embodiment of the disclosure is capable of providing an electronic device including a display for improving luminance decrease of a display by reducing electrical influence of external light on the display. 
     Various embodiments of the disclosure are capable of providing an electronic device including a display configured to have a substantially uniform light reflectivity over the entire region thereof so that a luminance change due to the electrical influence of external light is uniform throughout the screen. 
     Solution to Problem 
     An electronic device according to an embodiment of the disclosure may include: a transparent layer; a display panel disposed under the transparent layer, and including a pixel layer including a plurality of pixels configured to output light in a visible light band for displaying a content through the transparent layer, and a substrate layer disposed under the pixel layer and including a plurality of switches capable of driving the plurality of pixels; a biometric sensor disposed under at least part of the display panel, the biometric sensor being configured to acquire biometric information using at least some of reflected light obtained when at least some of light output through at least some of the plurality of pixels is reflected from an external object; and a coating configured to reflect external light in an infrared band, transmitted to the substrate layer, and to transmit light in the visible light band. The coating may be formed between the transparent layer and the display panel. 
     An electronic device according to an embodiment of the disclosure may include: a transparent layer; a display panel disposed under the transparent layer, and including a plurality of pixels configured to output light in a visible light band for displaying a content through the transparent layer; a biometric sensor disposed under at least part of the display panel and configured to acquire biometric information using at least some of reflected light obtained when at least some of light output through at least some of the plurality of pixels is reflected from an external object; and an anti-reflection member configured to prevent reflection of external light introduced through the transparent layer and the display panel. The anti-reflection member may be disposed between the display panel and the biometric sensor. 
     Advantageous Effects of Invention 
     With an electronic device including a display according to an embodiment, it is possible to improve outdoor visibility of the display by suppressing a luminance decrease of the display, which is caused by a photoelectric effect due to external light such as sunlight. With an electronic device including a display according to some embodiments, the amount of light reflected from lower media coupled to the display and transmitted to the semiconductor device of the display is substantially uniform over the entire region of the display. Thus, it is possible to improve image quality by making a luminance change caused by the electrical influence of reflected light uniform over the entire screen. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1A  is a front side perspective view of an electronic device including a display according to an embodiment. 
         FIG. 1B  is a rear side perspective view of an electronic device including a display according to an embodiment. 
         FIG. 2  is an exploded perspective view of an electronic device including a display according to an embodiment. 
         FIG. 3  is a cross-sectional view of a portion of the electronic device including a display according to an embodiment. 
         FIG. 4  is a cross-sectional view of a schematic structure of a display panel according to an embodiment. 
         FIG. 5A  is a graph concerning eV and the band gap of Si with respect to light wavelength. 
         FIG. 5B  is a graph representing photoelectric effects measured for each wavelength for a Si specimen. 
         FIG. 5 c    is a graph representing energy per unit area transmitted to a Si specimen, and current per unit area output by the Si specimen in response to the energy for each wavelength. 
         FIG. 5D  is a graph representing transmittances of on-cells of a display according to an embodiment for each light wavelength. 
         FIG. 5E  represents a voltage change of a storage capacitor of the display when external light is not incident on the electronic device or external light having a low illuminance is incident on the same. 
         FIG. 5F  represents a voltage change of a storage capacitor of the display when external light having a high illuminance is incident on the electronic device. 
         FIG. 6  is a cross-sectional view of a portion of the electronic device including a display according to an embodiment. 
         FIG. 7  is a cross-sectional view of a portion of the electronic device including a display according to an embodiment. 
     
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, various embodiments of the disclosure will be described with reference to the accompanying drawings. 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 alternatives for a corresponding embodiment. With regard to the description of the drawings, similar reference numerals may be used to designate similar or relevant 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 all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as “a first”, “a second”, “the first”, and “the second” may be used to simply distinguish a corresponding element from another, and does not limit the elements 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 another element (e.g., third element). 
     The expression “configured to” used in the disclosure may be interchangeably used with, for example, “suitable for”, “having the capacity to”, “designed to”, “adapted to”, “made to”, or “capable of” according to the situation. The term “configured to” may not necessarily imply “specifically designed to” in hardware. Alternatively, in some situations, the expression “device configured to” may mean that the device, together with other devices or components, “is able to”. For example, the phrase “processor adapted (or configured) to perform A, B, and C” may mean a dedicated processor (e.g., embedded processor) only for performing the corresponding operations or a generic-purpose processor (e.g., central processing unit (CPU) or application processor (AP)) that can perform the corresponding operations by executing one or more software programs stored in a memory device. 
     An 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 smart phone), 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. 
     According to various embodiments, the wearable device may include at least one of an accessory type (e.g., watch, ring, bracelet, anklet, necklace, glasses, contact lens, or head-mounted device (HMD)), a fabric or clothing-integrated type (e.g., electronic clothing), a body-mounted type (e.g., skin pad, or tattoo), and a bio-implantable type (e.g., implantable circuit). 
     According to some embodiments, the electronic device may include at least one of, for example, a television, a digital video disk (DVD) player, an audio, a refrigerator, an air conditioner, a vacuum cleaner, an oven, a microwave oven, a washing machine, an air purifier, a set-top box, a home automation control panel, a security control panel, a TV box (e.g., Samsung HomeSync™, Apple TV™, or Google TV™), a game console (e.g., Xbox™ and PlayStation™), an electronic dictionary, an electronic key, a camcorder, and an electronic photo frame. 
     According to various embodiments, the electronic device may include at least one of various medical devices (e.g., various portable medical measuring devices (blood glucose monitoring device, heart rate monitoring device, blood pressure measuring device, body temperature measuring device, etc.), magnetic resonance angiography (MRA), magnetic resonance imaging (MRI), computed tomography (CT) machine, ultrasonic machine, etc.), a navigation device, a global positioning system (GPS) receiver, an event data recorder (EDR), a flight data recorder (FDR), a vehicle infotainment device, electronic equipment for a ship (e.g., ship navigation device, gyro-compass, etc.), avionics, a security device, an automobile head unit, a home or industrial robot, an automatic teller&#39;s machine (ATM) in banks, point of sales (POS) in a shop, or Internet of things devices (e.g., light bulb, various sensors, electric or gas meter, sprinkler device, fire alarm, thermostat, streetlamp, toaster, sporting goods, hot water tank, heater, boiler, etc.). According to some embodiments, the electronic device may include at least one of a part of furniture or a building/structure, an electronic board, an electronic signature receiving device, a projector, and various kinds of measuring instruments (e.g., water meter, electric meter, gas meter, radio wave meter, etc.). In various embodiments, the electronic device may be flexible, or may be a combination of one or more of the aforementioned various devices. The electronic device according to various embodiments of the disclosure is not limited to the aforementioned devices. In the disclosure, the term “user” may refer to a person using an electronic device or a device (e.g., artificial intelligence electronic device) using an electronic device. 
       FIG. 1A  is a front side perspective view of an electronic device including a display according to an embodiment.  FIG. 1B  is a rear side perspective view of an electronic device including a display according to an embodiment.  FIG. 2  is an exploded perspective view of an electronic device including a display according to an embodiment. 
     Referring to  FIGS. 1A and 1B , an electronic device  100  according to an embodiment may include a housing  110  that forms all or at least part of the exterior of the electronic device  100 . The housing  110  may include a non-metallic material and/or a metallic material. For example, the housing  110  may be formed of materials, such as plastic, metal, carbon fiber and other fiber composites, ceramics, glass, and wood, or a combination thereof. According to various embodiments, the entire housing  110  may be formed of a single material or a combination of multiple materials. According to an embodiment, at least part of the housing  110  is designed to have a metallic material, and may form the exterior of the electronic device  100 . 
     The housing  110  may form the exterior including a front face  110 A, a rear face  110 B, and a side face  110 C surrounding a space between the front face  110 A and the rear face  110 B. In another embodiment, although not illustrated, the term “housing” may refer to a structure forming at least part of the front face  110 A, the rear face  110 B, and the side face  110 C of the housing  110 . 
     The housing  110  may include a cover or plate (hereinafter, referred to as a “front plate”)  101  forming the front face  110 A. According to an embodiment, at least part of the front face  110 A may be formed by a substantially transparent front plate  101  (e.g., a glass plate or a polymer plate including various coating layers). 
     The housing  110  may include a cover or plate (hereinafter, referred to as a “rear plate”)  102  forming the rear face  110 B. According to an embodiment, the rear face  110 B may be formed by a substantially opaque rear plate  102 . The rear plate  102  may be formed of, for example, coated or colored glass, ceramic, a polymer, or a metal (e.g., aluminum, stainless steel (STS), or magnesium), or a combination of two or more of these materials. 
     The housing  110  may include a side member (or a side bezel structure)  103  forming the side face  110 C. The side member  103  may be in the form of being coupled to the front plate  101  and the rear plate  102  and surrounding the space between the front plate  101  and the back plate  102 . At least part of the side member  103  may be formed of various materials such as a metal or a polymer. The side member  103  may include an outer structure  103 A formed of a metallic material and an internal structure (not illustrated) formed of a material such as a polymer coupled to the outer structure  103 A. According to an embodiment, in order to prevent the radio wave radiation performance of the electronic device  100  from being deteriorated by the side member  103 , a portion of the side member  103  may be physically or electrically separated from the remaining portion of the side member  103 . The internal structure may allow a portion of the side member  103  to be maintained in the state of being physically or electrically separated from the remaining portion of the side member  130 . Some portions  1035  of the inner structure may be disposed in gaps  104  in the outer structure  103 A to be exposed to the outside. According to some embodiments, the rear plate  102  and the outer structure  103 A may be integrally formed. According to various embodiments, when the rear plate  102  and the outer structure  103 A are integrally formed, the rear plate  102  and the outer structure  103 A may include the same metallic material. 
     According to various embodiments, the edge area of the front face  110 A or the back face  110 B may be formed as an inclined face (e.g., a curved face). For example, at least one of opposite edge regions  1011  and  1012  of the front face  110 A in the width direction  1003  or at least one of opposite edge regions  1013  and  1014  of the rear face  110 B in the width direction  1003  may be an inclined face. According to an embodiment, the front plate  101  may be formed to have a curved portion for forming an inclined face of the front face  110 A. Similarly, the rear plate  102  may be formed to have a curved portion for forming an inclined face of the rear face  110 B. 
     The electronic device  100  may include various components disposed between the front plate  101  and the rear plate  102 . According to an embodiment, the electronic device  100  may include at least one of a display  121 , audio modules  1221 ,  1222 , and  1223 , sensor modules  1231  and  1232 , camera modules  1241 ,  1242 , and  1243 , key input devices  1251 ,  1252 , and  1253 , an indicator  126 , connector holes  1271  and  1272 , or an electronic pen  128 . In some embodiments, in the electronic device  100 , at least one of the components (e.g., the key input devices  1251 ,  1252 , and  1253  or the indicator  126 ) may be omitted, or other components may be additionally included. 
     The display  121  may be disposed along at least a portion of the front plate  101 , and may be exposed through the front plate  101 . The front plate  101  may include a region  101 A that covers the display  121  (hereinafter, referred to as a “screen region”) and a region  101 B that does not cover the display  121  (hereinafter, referred to as a “bezel region”). The screen region  101 A is generally rectangular, and the bezel region  101 B may have a rectangular ring shape surrounding the screen region  101 A. The screen region  101 A is a substantially transparent region, and light generated from the display  121  may pass through the screen region  101 A to be emitted to the outside. The bezel region  101 B may be a substantially opaque region (e.g., a light-blocking region). For example, the bezel region  101 B may include a layer including a light-blocking material. For example, the bezel region  101 B may have a color similar to or the same as the side member  103 . 
     According to various embodiments. the display  121  may be coupled to or disposed adjacent to a touch-sensitive a sensor, a pressure sensor capable of measuring touch intensity (pressure), and/or a pen sensor (digitizer) configured to detect a magnetic-field-type electronic pen. 
     The audio modules  1221 ,  1222 , and  1223  may include a microphone hole  1221  and speaker holes  1222  and  1223 . The microphone hole  1221  may include a microphone disposed therein so as to acquire external sound, and in some embodiments, the microphone hole  1221  may include multiple microphones disposed therein so as to sense the direction of sound. The speaker holes  1222  and  1223  may include an external speaker hole  1222  and a phone call receiver hole  1223 . In some embodiments, the speaker holes  1222  and  1223  and the microphone hole  1221  may be implemented as a single hole, or a speaker (e.g., a piezo speaker) may be included without the speaker holes  1222  and  1223 . 
     The sensor modules  1231  and  1232  may generate electrical signals or data values corresponding to an internal operating state or an external environmental state of the electronic device  100 . The sensor modules  1231  and  1232  may include, for example, a first sensor module  1231  (e.g., a proximity sensor) and/or a second sensor module (not illustrated) (e.g., a fingerprint sensor) disposed on the front face  110 A of the housing  110 , and/or a third sensor module  1232  (e.g., an HRM sensor) disposed on the rear face  110 B of the housing  110 . The fingerprint sensor may be disposed not only on the front face  110 A (e.g., the home key button  1251 ), but also on the second face  110 B. The electronic device  100  may further include at least one of sensor modules (not illustrated), such as 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 biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor  1231 . 
     The camera modules  1241 ,  1242 , and  1243  may include a first camera device  1241  disposed on the front face  110 A of the electronic device  100 , a second camera device  1242  disposed on the second face  110 B, and/or a flash  1243 . The camera modules  1241 ,  1242 , and  1243  may include one or more lenses, an image sensor, and/or an image signal processor. The flash  1243  may include, for example, a light-emitting diode or a xenon lamp. In some embodiments, two or more lenses (e.g., a wide-angle lens and a telephoto lens) and image sensors may be disposed on one face of the electronic device  100 . 
     According to an embodiment, the key input devices  1251 ,  1252 , and  1253  may include a home key button  1251  disposed on the front face  110 A, a touch pad  1252  disposed in the vicinity of the home key button  1251 , and/or a side key button  1253  disposed on the side face  110   c . In another embodiment, the electronic device  100  may not include some or all of the above-mentioned key input devices  1251 ,  1252 , and  1253 , and a non-included key input device  1251 ,  1252 , or  1253  may be implemented in another form, such as a soft key, on the display  121 . 
     According to various embodiments, the electronic device  100  may include various light sensors disposed under the display  121  or along at least part of the rear face of the display  121 . For example, the light sensors may be disposed adjacent to the rear face of the display  121  at a distance of about several hundred micrometers (um) or less. The light sensors may measure intensity or the like for various wavelength bands of light, and the electronic device  100  may quantitatively or qualitatively analyze materials using data measured from the light sensors. 
     According to an embodiment, a light sensor may include at least one light receiver or a photo detector such as a photodiode capable of detecting light in one or more wavelength bands. 
     According to an embodiment, the light receiver may detect light in a wavelength band for proximity detection (e.g., a maximum sensitivity wavelength of about 940 nm or about 950 nm). For example, in a proximity detection mode, when an external object or an object (e.g., a user&#39;s face) moves toward the front face  110 A of the electronic device  100  to the vicinity of the light sensor, light in a wavelength band for proximity detection, output from a light emitter may be scattered or reflected by the external object. The light receiver may generate an electrical signal regarding the proximity of the external object or the like based on the scattered or reflected light. 
     According to an embodiment, the light receiver may detect light in the wavelength band for gesture detection (e.g., a maximum sensitivity wavelength of about 940 nm). For example, in the proximity detection mode, when the user&#39;s hand moves in the vicinity of the front face  110 A of the electronic device  100 , light in a wavelength band for gesture detection, output from the light emitter, may be scattered or reflected by the user&#39;s hand. The light receiver may generate an electrical signal regarding the gesture of the user&#39;s hand on the scattered or reflected light. 
     According to an embodiment, the light receiver may detect light in a wavelength band for object analysis. For example, in a biometric detection mode, when the user&#39;s body moves toward the front face  110 A of the electronic device  100  to the vicinity of the light sensor, light in a wavelength band for biometric detection, output from the light emitter, may be scattered or reflected by the user&#39;s body. The light receiver may generate an electrical signal related to biometric information of the user&#39;s body (e.g., skin moisture, skin melanin, skin temperature, heart rate, blood flow rate, or iris) from the scattered or reflected light. 
     According to an embodiment, a light sensor may include at least one light emitter or a light source capable of generating light of one or more wavelength bands. The light emitter is able to generate light in all wavelength bands where the light receiver is capable of detecting light. For example, the light emitter may be configured as a single light emitter, such as a light emitting diode (LED), and the single light emitter may generate light in a broad wavelength band. 
     According to some embodiments, the light emitter may be configured to selectively generate light in a corresponding wavelength band under the control of the processor. For example, in the proximity detection mode, the control circuit may control the light emitter to generate light in the wavelength band for proximity detection, and in the biometric detection mode, the control circuit may control the light emitter to generate light in the wavelength band for biometric detection. 
     According to some embodiments, a light sensor may not include a light emitter, and may use a light source of another component such as the display  121 . Light output through some pixels of the display  121  is reflected to an external object, and at least part of the reflected light may be introduced into the light receiver of the light sensor. 
     The side member  103  may include a mid-plate (not illustrated) extending from the outer structure  103 A or coupled to the outer structure  103 A, and the mid-plate may be disposed between the display  121  and the rear plate  102 . A second sensor module including a fingerprint sensor or the like may be disposed between the display  121  and the mid-plate. According to some embodiments, the home key button  1251  may be omitted, and a software home button replacing the home key button  1251  may be displayed on the display  121 . The second sensor module may be aligned below the location at which the software home button is displayed. When a finger is brought into contact with the region in which the software home button is displayed, the light emitter of the second sensor module may output light in the corresponding wavelength band related to biometric recognition (e.g., fingerprint recognition), and the light may be delivered to the finger through the region in which the software home button is displayed. According to some embodiments, light in the corresponding wavelength band related to biometric recognition may be output in the region in which the software home button is displayed. At least part of the light (or light energy or a light signal) scattered or reflected from a finger may be introduced into the light receiver through the region in which the software home button is displayed. The light receiver may receive light in the wavelength band related to biometric recognition, may generate an electrical signal (a detection value or digital value) about the biometric information from the received light, and may transmit the electrical signal to a control circuit such as a processor of the electronic device  100 . 
     The indicator  126  may be disposed, for example, on the front face  110 A of the housing  110 . The indicator  126  may include an LED as long as it can provide, for example, the state information of the electronic device  100  in an optical form. 
     The connector holes  1271  and  1272  may include a first connector hole  1271  capable of accommodating 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  1272  capable of accommodating a connector (e.g., an earphone jack) for transmitting and receiving an audio signal to and from an external electronic device. 
     The electronic pen  128  may be inserted into the housing  110  or removed from the housing  110  through a hole (not illustrated) formed in the side face  110 C. The electronic device  100  may include a device (e.g., a sensor) for detecting attachment/detachment of the electronic pen  128 . 
     The display  121  may include a semiconductor element serving as a switch for controlling pixels. When external light, such as sunlight, enters the display  121 , a photoelectric effect in which the semiconductor element absorbs light to generate a photon occurs, which may cause leakage current from the semiconductor element. The leakage current may cause a voltage drop on pixels, thereby lowering the luminance of the display  121 . According to an embodiment, the electronic device  100  may include at least one first layer for reducing the electrical influence of external light, such as sunlight incident on the front face  110 A, on the semiconductor element of the display  121 . At least one first layer may be disposed between the front face  110 A and the display  121  or may be included in the display  121 . The first layer may block the light in a corresponding wavelength band from the external light such as sunlight from entering the semiconductor element of the display  121 . 
     According to an embodiment, the at least one first layer may reflect, absorb, or block light having a wavelength at which the human eye cannot feel brightness in sunlight. According to an embodiment, the at least one first layer may reflect, absorb, or block light in the infrared band, which occupies a significant portion in the photoelectric effect on the semiconductor element in sunlight. Since the electronic device  100  is capable of reflecting, absorbing, or blocking light in the infrared band entering the display  121  using the at least one first layer, it is possible to relatively reduce leakage current from the semiconductor element, which is caused due to the photoelectric effect, compared with a conventional electronic device. When the leakage current from the semiconductor element is reduced, it is possible to suppress the luminance decrease of the display  121 . 
     External light, such as sunlight entering the display  121 , may be reflected from a lower medium disposed under the display and may be absorbed into the semiconductor element, and this reflected light may also cause leakage current from the semiconductor element, thereby causing luminance decrease of the display. According to an embodiment, when external light such as sunlight is incident on the front face  110 A, some of the external light (e.g., light in the infrared band) may be reflected, absorbed, or blocked by the at least one first layer, and the remaining external light (e.g., light in the visible light band or light in the ultraviolet band) may pass through the display  121  and may be reflected from the lower medium to be introduced into the semiconductor element. 
     According to an embodiment, a first rear region of the display  121  may be coupled to a first lower medium including one or more layers, and a second rear region of the display  121  may be coupled to a second lower medium, which is at least partially different from the first lower medium including one or more layers. According to an embodiment, a portion of the first lower media may be disposed in the same layer as a portion of the second lower medium. 
     According to an embodiment, the second lower medium may include a second sensor module including a fingerprint sensor. According to some embodiments, the first sensor module  1231  including a proximity sensor or the like may be disposed between the display  121  and the mid-plate, and may form a portion of the second lower medium. 
     Light passing through the display  121  may be reflected from the first lower medium to be introduced into the first display region aligned to the first rear region, and may be reflected from the second lower medium to be introduced into the second display region aligned to the second rear region. The amount of light reflected from the first lower medium and introduced into the first display region may be determined by the reflectivity of the interface between the first lower medium and the first display region, and the reflectivity of the interface between the layers included in the first lower medium. Similarly, the amount of light reflected from the second lower medium and introduced into the second display region may be determined by the reflectivity of the interface between the second lower medium and the first display region, and the reflectivity of the interface between the layers included in the second lower medium. The reflectivity of an interface may be determined based on the refractive indexes of two media forming the interface. 
     According to an embodiment, the first lower medium and the second lower medium may be designed such that the amount of light reflected from the first lower medium and introduced into the first display region and the amount of light reflected from the second lower medium and introduced into the second display region are substantially the same. When the first lower medium and the second lower medium are designed as described above, the luminance change of the first display region and the luminance change of the second display region due to the electrical influence of reflected light may be substantially constant, and image quality may be improved. 
     Referring to  FIG. 2 , an electronic device  200  may include a side member  210 , a display  220 , a light sensor  230 , a printed circuit board (PCB)  240 , a support member  260  (e.g., a rear case), or a rear plate  280 . In some embodiments, in the electronic device  200 , at least one of the components (e.g., the support member  260 ) may be omitted, or other components may be additionally included. At least one of the components of the electronic device  200  may be the same as or similar to at least one of the components of the electronic device  100  of  FIG. 1A or 1B , and a redundant description will be omitted below. 
     Referring to  FIG. 2 , the side member  210  may include an outer structure  210 A formed of a metallic material and a mid-plate  210 B (not illustrated) extending from the outer structure  210 A or coupled to the outer structure  210 A, and the mid-plate  210 B may be disposed between the display  220  and the rear plate  280 . The side member  210  may include an outer structure  210 A and an inner structure  210 C made of a material such as a polymer and coupled to the mid-plate  210 C. 
     According to an embodiment, the display  220  may include a front plate  232  disposed on the opposite side to the rear plate  280 . 
     According to an embodiment, the light sensor  230  may be disposed between the display  220  and the mid-plate  210 B, and may be electrically connected to the printed circuit board  240  via an electrical connection means such as a flexible printed circuit board (FPCB). According to an embodiment, the display  220  may display a software home button at a position aligned with the light sensor  230 . According to an embodiment, the light sensor  230  may be a fingerprint sensor, and when a finger is brought into contact with the region  222  on which the software home button is displayed, the fingerprint sensor or the display  220  may output light in a corresponding wavelength band related to fingerprint recognition, and the light may be delivered to the finger through the region  222  on which the software home button is displayed. At least some of the light scattered or reflected by the finger may be introduced into the fingerprint sensor through the region  222  on which the software home button is displayed, and the fingerprint sensor may generate and deliver the corresponding electrical signal to the printed circuit board  240 . According to some embodiments, although not illustrated, a light sensor  230 , such as a fingerprint sensor, may be installed in a region of the display  220  other than the region  222  on which the software home button is displayed, and a partial rear region of the display  220  aligned with the light sensor  230  may not be covered with a back cover, such as a light-blocking material. 
     According to an embodiment, the electronic device  200  may include at least one first layer for reducing the electrical influence of external light, such as sunlight incident on the display, on the semiconductor element of the display  220 . The at least one first layer may block light in the infrared band in external light such as sunlight from entering the semiconductor element of the display  220 . 
     According to an embodiment, the display  220  may have at least one second layer so as to reduce a luminance difference between the first display region  221  and the second display region  222  on the electrical influence of reflected light. 
     The printed circuit board  240  may be coupled to, for example, the side member  210 , and may be disposed between the mid-plate  210 B and the rear plate  280 . 
     On the printed circuit board  240 , a processor, memory, and/or an interface may be mounted. The processor may include at least one of, for example, a central processing unit, an application processor, a graphics processor, an image signal processor, a sensor hub processor, or a communication processor. 
     The memory may include, for example, volatile memory or nonvolatile 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. The interface may electrically or physically connect, for example, the electronic device  200 , to an external electronic device, and may include a USB connector, an SD card/an MMC connector, or an audio connector. 
     The support member  260  may be coupled to the side member  210 , and may be disposed between the printed circuit board  240  and the rear plate  280 . The support member  260  may be coupled to the mid-plate  210 B together with the printed circuit board  240  using bolt fastening or the like, and may serve to cover and protect the printed circuit board  240 . 
     The electronic device  200  may include a battery (not illustrated). The battery is a device for supplying power to at least one component of the electronic device  200 , and may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell. At least part of the battery may be disposed to be substantially flush with, for example, the circuit board  240 . The battery  250  may be integrally disposed within the electronic device  200 , or may be detachably mounted on the electronic device  200 . 
     The electronic device  200  may include an antenna (not illustrated). The antenna may be disposed between the rear plate  280  and the battery. The antenna may include, for example, a near field communication (NFC) antenna, a wireless charging antenna, and/or a magnetic secure transmission (MST) antenna. The antenna may perform short-range communication with, for example, an external electronic device, or may transmit/receive power required for charging to/from an external device in a wireless manner. In another embodiment, an antenna structure may be formed by the side structure  210 , a portion of the support member  260 , or a combination thereof. 
     According to various embodiments, the electronic device  200  may further include various components (modules) according to the provided type thereof. Although it is impossible to list all of these components since the components are modified very diversely according to the convergence trend of digital devices, the electronic component  200  may further include components equivalent to the above-mentioned components. According to various embodiment, in the electronic device  200 , specific components may be omitted from the above-mentioned components or may be replaced by other components according to the provided type of the electronic device  200 . 
       FIG. 3  is a cross-sectional view of a portion of the electronic device including a display according to an embodiment.  FIG. 4  is a cross-sectional view of a schematic structure of a display panel according to an embodiment. 
     Referring to  FIG. 3 , for example, when an element A, an element B, and an element C are disposed in this order in a second direction  30021 , it may be defined that the element A is disposed on the element B and the element C is disposed under the element B. The electronic device  300  may include a transparent layer  310  (e.g., the front plate  101  in  FIG. 1A ), a display  330  disposed under the transparent layer  310 , and a light sensor  350  disposed under the display  330 . The light output from the light sensor  350  or the display  330  may be emitted to the outside through the display  330  and the transparent layer  310 , and the light scattered or reflected from the external object may be introduced into the light sensor  350  through the transparent layer  310  and the display  330 . According to an embodiment, various sensors may be applied to the light sensor  350 , and the light sensor  350  may be a proximity sensor or a biometric sensor. 
     The transparent layer  310  may include, for example, a light-transmissive glass plate, a polymer plate, or the like, which forms the front face  3001  of the electronic device. 
     The display  330  may include, for example, a display panel  331  electrically connected to the processor of the electronic device so as to output light related to an image. Referring to  FIG. 4 , the display panel  331  may include a pixel layer  410  and a substrate layer  420 . The pixel layer  410  may include an organic light-emitting diode (OLED), and may include a first electrode  411 , a second electrode  412  disposed under the first electrode  411 , and an organic layer  413  disposed between the first electrode  411  and the second electrode  412 . The second electrode  412  corresponds to a positive pole that emits holes, and may be an anode electrode including a light-transmissive indium tin oxide (ITO), an antimony tin oxide (ATO), or the like. The first electrode  411  corresponds to a negative pole that emits electrons, and may be a cathode electrode including Al, Si, Li, Ca, Mg, or the like. 
     The substrate layer  420  may include a thin film transistor (TFT) disposed under the pixel layer (or the OLED layer)  410 . According to an embodiment, the substrate layer  420  may include a source electrode  421 , a drain electrode  422 , a gate electrode  423 , and a semiconductor layer  424 . The source electrode  431  may be an electrode that supplies electrons, and the drain electrode  432  may be an electrode that receives electrons and may be electrically connected to the second electrode  412 . The gate electrode  423  may be an electrode for controlling electron movement from the source electrode  421  to the drain electrode  422 . The semiconductor layer  424  including a semiconductor material such as Si may be electrically connected to the source electrode  431  and the drain electrode  432 , and may become a path that enables movement of electrons like a conductor when a voltage equal to or higher than a predetermined level is applied to the gate electrode  433 . In some embodiments, the semiconductor layer  434  may be defined as an “active layer” or an “active region”. The substrate layer  420  may include an insulating portion (or insulating layer)  425  of an insulating material for separating the gate electrode  423  from other portions. 
     Due to the reaction of the semiconductor layer  424 , current may flow along a path  490  formed by the source electrode  421 , the semiconductor layer  424 , the drain electrode  422 , the second electrode  412 , the organic layer  413 , and the first electrode  411 . When a voltage is applied to the first electrode  411  and the second electrode  412  due to this current flow, electrons emitted from the second electrode  412  and holes emitted from the first electrode  411  are coupled in the organic layer  413  and exciton energy due to the coupling of the electrons and the holes may be emitted from the organic layer  413  in the form of light. The first electrode  411  is a common electrode for a plurality of pixels, and the second electrode  412  and the organic layer  413  may be elements for one pixel. Hereinafter, the second electrode  412  and the organic layer  413  will be referred to as a “pixel layer”. The display panel  331  may include a plurality of pixel layers (not illustrated) disposed under the first electrode  411 . The OLED layer  410  may include an insulating portion (or an insulating layer)  414  of an insulating material disposed between the pixel layers. 
     Referring to  FIGS. 3 and 4 , the display panel  331  may include a substrate  430  of a light-transmissive material, such as glass, to which the OLED layer  410  and the substrate layer  420  are coupled, and the substrate layer  420  may be disposed between the OLED layer  410  and the substrate  430 . 
     The display panel  331  may further include other various layers (not illustrated). For example, the display panel  331  may include a light-transmissive buffer layer formed of a material, such as silicon oxide or silicon nitride and disposed between the substrate layer  420  and the substrate  430 . For example, the display panel  331  may include a protection layer formed of a polymer or the like disposed between the buffer layer and the substrate  430 . 
     Referring to  FIGS. 3 and 4 , when external light, such as sunlight, is introduced into the display  330 , a photoelectric effect occurs in which the semiconductor layer  424  absorbs light to generate photoelectrons, which may cause leakage current from the semiconductor layer  424 . The leakage current may cause a voltage drop on pixels, thereby lowering the luminance of the display  330 . According to an embodiment, the electronic device  300  may include at least one first layer  320  for reducing the electrical influence of external light, such as sunlight incident on the front face  3001  thereof, on the semiconductor layer  424  of the display  330 . The at least one first layer  320  may be disposed between the front face  3001  and the display  330  or may be included in the display  330 . The first layer  320  may block the light in a corresponding wavelength band from the external light such as sunlight from entering the semiconductor layer  424  of the display  330 . According to an embodiment, the first layer  320  may be a film disposed between the transparent layer  310  and the display  330 , or may include a material coated on the transparent layer  310  or the display  330 . 
     According to some embodiments, the first layer  320  may be disposed on the transparent layer  310 , between the polarization layer  333  and the phase retardation layer  332 , or between the phase retardation layer  332  and the display panel  331 . 
       FIG. 5A  is a graph concerning eV and the band gap of Si with respect to light wavelength. Referring to  FIG. 5A , infrared rays, which have high energy (eV) compared to the band gap (e.g., 1.11 eV) of Si, which is a material of a semiconductor layer, are able to excite electrons. 
       FIG. 5B  is a graph representing photoelectric effects measured for each wavelength for a Si specimen. Referring to  FIG. 5B , in view of the external quantum efficiency of a Si specimen, it can be seen that photoelectric effects are induced not only by light in the visible light band, but also by light in the infrared band. 
       FIG. 5C  is a graph representing power (W) (e.g., solar energy) (W/m 2 /nm) incident on a predetermined area (or a unit area (m 2 )) for each wavelength (nm) transmitted to a silicon (Si) specimen, and the amount of current (A) (A/m 2 /nm) output when the Si specimen responds to the power and incident on a predetermined area (or a unit area (m 2 )) for each wavelength (nm). Referring to the portion indicated by  500   c  of  FIG. 5 c   , it can be seen that not only the light in the visible light band but also the light in the infrared band occupies a significant portion in the photoelectric effects. 
       FIG. 5D  is a graph representing transmittances of on-cells of a display according to an embodiment for each light wavelength. With respect to on-cells corresponding to Type 1 and Type 2, it can be seen that the transmittance of light in the infrared band is generally higher than that of light in the visible light band. It can be said that light in the infrared band is more likely to reach the semiconductor layer of a TFT. 
     Referring to  FIGS. 5A, 5B, 5C, and 5D , when light in the infrared band is blocked from entering the display  330  of  FIG. 3 , it is possible to reduce the electrical influence of external light, such as sunlight, on the display  330 . 
     Referring to  FIG. 3 , according to an embodiment, the first layer  320  may be disposed between the transparent layer  310  and the display  330 . The first layer  320  may reflect, absorb, or block light in the infrared band and may transmit light in the visible light band. Since the light in the infrared band, introduced into the display  330  using the at least one first layer  320  is reflected, absorbed, or blocked, the electronic device  300  is capable of relatively reducing leakage current from the semiconductor layer  424  in  FIG. 4 , which is caused by a photoelectric effect due to external light, compared to a conventional electronic device. When the leakage current from the semiconductor layer is reduced, it is possible to suppress the luminance decrease of the display  330 . 
     According to an embodiment, in the external light, such as sunlight, incident on the front face  3001 , light in the infrared band may be reflected, absorbed or blocked by the first layer  320 , and light in the ultraviolet band and light in the visible light band may be introduced into the display  330 . The light in the ultraviolet band and the light in the visible light band may cause leakage current due to the photoelectric effect in the semiconductor layer  424  of  FIG. 4 , and may cause a voltage drop on the pixels, thereby lowering the luminance of the display  330 . According to an embodiment, the electronic device  300  may further include a layer for blocking the light in the ultraviolet band from entering the display  330 , and it is possible to suppress the luminance decrease of the display  330  caused due to the light in the ultraviolet band. According to an embodiment, the transparent layer  310  may include a material for reflecting, absorbing, or blocking light in the ultraviolet band. According to some embodiments, the first layer  320  may include a material for reflecting, absorbing, or blocking light in the ultraviolet band. According to some embodiments, the display  330  may include a layer for blocking light in the ultraviolet band from entering the display panel  331 . 
     According to an embodiment, when the light sensor  350  is designed to use light in the infrared band, such as 950 nm, light in the infrared band output from the light sensor  350  or light in the infrared band scattered or reflected from an external object may be difficult to pass through the first layer  320 . According to an embodiment, the processor of the electronic device  300  may perform a pixel driving routine that causes pixels to be turned off (or deactivate) for a partial time of a frame (or an image frame). For example, the pixel driving routine may be designed to turn off pixels at a defined time ratio in a frame. The processor of the electronic device  300  may turn on (activate) a pixel for a predetermined time in a frame and may turn off (deactivate) the pixel for the remaining time according to the pixel driving routine. According to an embodiment, the display  300  may be an active matrix organic light-emitting diodes (AMOLED) display in a form including at least one TFT that individually controls a pixel. According to an embodiment, the pixel driving routine may be an AMOLED impulsive drive (AID), and a ratio of turning on a pixel in the frame may be defined as an “AID ratio”. According to an embodiment, in the detection mode using the light sensor  350 , the processor of the electronic device  300  may perform the light sensor driving routine such that, in a section in which the pixel is turned off, the light sensor  350  outputs light and receives light scattered or reflected from an external object. 
     Referring to  FIG. 3 , the display  330  may include a second display region  330   b  aligned with the light sensor  350  such as a fingerprint sensor, and a first display region  330   a  in addition to the second display region  330   b . According to an embodiment, an air layer  360  may exist between the second display region  330   b  and the light sensor  350 . According to an embodiment, the electronic device  300  may include a back cover  340  coupled to the rear face of the first display region  330   a  of the display  330 , and the air layer  360  may be formed by a hole  341  formed in the back cover  340 . The back cover  340  may support and protect the display panel  311 , and may include a material capable of absorbing or blocking external light or light or electromagnetic waves generated from the display panel  311 . According to an embodiment, the back cover  340  may include a black film and a metal (e.g., copper) plate. According to some embodiments, the back cover  340  may be included in the display panel  311 . 
     According to an embodiment, by the media coupled to the rear face of the display  330 , a first interface  301  between the first display region  330   a  and the back cover  340 , a second interface  302  between the second display region  330   b  and the air layer  360 , and a third interface  303  between the air layer  360  and the light sensor  350  may be formed. The reflectivity of an interface  301 ,  302 , or  303  may be determined based on the refractive indexes of two media forming the interface. For example, the greater the difference in refractive index between the two media, the greater the reflectivity of the interface between the two media. According to an embodiment, the reflectivity of the first interface  301  may be about 1.7%, and the reflectivity of the second interface  302  or the third interface  303  may be about 4%. 
     For example, when external light such as sunlight is incident on the front face  3001 , some of the external light (e.g., light in the infrared band) may be absorbed or blocked by the at least one first layer  320 , and the remaining external light (e.g., light in the visible light band or light in the ultraviolet band) may pass through the display  330 . Light passing through the display  330  may be reflected from the first interface  301 . Light passing through the display  330  may be reflected from the second interface  302 , and light passing through the air layer  360  may be reflected from the third interface  303 . 
     Light passing through the display  330  may be reflected from the medium layers including the first interface  301 , and reflected light having a first light amount may be introduced into the first display region  330   a . Light passing through the display  330  may be reflected from the medium layers including the second interface  302  and the third interface  303 , and reflected light having a second light amount may be introduced into the second display region  330   b . According to an embodiment, the first light amount reflected from the medium layers including the first interface  301  and the second light amount reflected from the medium layers including the second interface  302  and the third interface  303  may be different from each other. According to an embodiment, when the first light amount and the second light amount are different from each other, it may mean that the difference between the first light amount and the second light amount exceeds a set threshold. In addition, when the first light amount and the second light amount are substantially the same, it may mean that the difference between the first light amount and the second light amount does not exceed a set threshold. 
     When the first light amount reflected from the medium layers including the first interface  301  and the second light amount reflected from the medium layers including the second interface  302  and the third interface  303  are different from each other, a luminance change in the first display region  330   a  and a luminance change in the second display region  330   b , which are caused by the electrical influence of the reflected light, may be different from each other. For example, the second display region  330   b  may emit light having a lower luminance than the first display region  330   a .  FIG. 5E  represents a voltage change of a storage capacitor of the display  330  when external light is not incident on the electronic device  300  of  FIG. 3  or external light having a low illuminance is incident on the same. FIG.  5 F represents a voltage change of a storage capacitor of the display  330  when external light having a high illuminance is incident on the electronic device  300  of  FIG. 3 . The display panel  331  may include a light-emitting element (e.g., an OLED), at least one TFT, and a storage capacitor. The at least one TFT may include a TFT that serves as a switch and a driving TFT, which causes current to flow to the light-emitting element. The storage capacitor may be defined as an element that maintains a voltage signal in a pixel, an element that maintains a voltage applied to a pixel within one frame, or an element that reduces a change in the gate voltage of the TFT due to leakage current during a light emission time. By a routine for controlling at least one TFT (e.g., initialization or data write), the storage capacitor is able to maintain the voltage applied to a pixel at regular time intervals. Referring to  FIG. 5E , even if external light is not incident or external light having a low illuminance is incident, there is no or little electrical influence of the external light on the display  330 . Thus, the voltage of the storage capacitor for the first display region  330   a  and the second display region  330   b  can be maintained (501) without dropping. Referring to  FIG. 5F , it can be seen that when external light having a high illuminance is incident, the voltage drop  502  of the second display region  330   b  is greater than the voltage drop  503  of the first display region  330   a  due to the electrical influence by the external light. Since the voltage drop  502  of the second display region  330   b  is greater than the voltage drop  501  of the first display region  330   a , the second display region  330   b  may emit light having a lower luminance than that of the first display region  330   a.    
     According to an embodiment, in order to ensure that the first light amount reflected by the first display region  330   a  and the second light amount reflected by the second display region  330   b  are substantially the same, at least one medium layer (not illustrated) may be interposed in at least one of the first interface  301 , the second interface  302 , and the third interface  303 . 
     The display  330  according to an embodiment may include a phase retardation layer (or retarder)  332  disposed on the display panel  331  and a polarization layer (or a polarizer)  333  disposed on the phase retardation layer  332 . According to an embodiment, when unpolarized light such as sunlight travels in a second direction  30021 , the unpolarized light passes through the polarization layer  333  to turn into linearly polarized light, and the linearly polarized light may pass through the phase retardation layer  332  to turn into a circularly polarized light. For example, when the unpolarized light passes through a 90 degree polarization layer  333 , the unpolarized light may be changed to 90 degree linearly polarized light, and when the 90 degree linearly polarized light passes through a 45 degree phase retardation layer  332 , the 90 degree linearly polarized light may be changed to 135 degree circularly polarized light. The 135 degree circularly polarized light may have value between 90 degrees and 180 degrees, which are linear polarization axes, and may oscillate in both the X and Y axes, that is, with 90 degree and 180 degree phases. The circularly polarized light is not placed on a specific axis, and is able to change the axis while evenly oscillating. According to an embodiment, the phase retardation layer  332  may have the characteristic of a quarter wave retarder (λ/4 retarder). 
     Referring to  FIGS. 3 and 4 , when sunlight is incident on the transparent layer  310 , most of the light may be reflected from the electrodes included in the substrate layer  420 , the OLED layer  410 , and the like, which may cause difficulty in screen recognition. According to an embodiment, the polarization layer  333  and the phase retardation layer  332  may prevent light, entering from the outside, from being reflected, thereby improving outdoor visibility. For example, the 135 degree circularly polarized light changed by the phase retardation layer  332  may be reflected on the substrate layer  420  or the OLED layer  410 , and the reflected 135 degree circularly polarized light may be changed to 180 degree linearly polarized by passing through the phase retardation layer  332 . Then, the  180  linearly polarized light cannot be emitted to the outside through the 90 degree polarization layer  333 . According to some embodiments, a single layer in which the polarization layer  333  and the phase retardation layer  332  are combined may be provided, and such a layer may be defined as a “circular polarization layer”. 
     According to various embodiments, the electronic device  300  may further include at least one layer  380  formed of various light-transmissive materials such as polyethylene and a polymer and disposed under the display  330 . A portion of the back cover  340  is disposed between the layer  380  and the light sensor  350 , and the air layer  360  may be formed by a space surrounded by the layer  380 , the light sensor  350 , and the back cover  340 . According to some embodiments, the layer  380  include a plurality of holes (not illustrated), which may serve to facilitate the separation of the display  330  and the back cover  340 . 
       FIG. 6  is a cross-sectional view of a portion of the electronic device including a display according to an embodiment. At least one of the components of the electronic device  600  may be the same as or similar to at least one of the components of the electronic device  300  of  FIG. 3 , and a redundant description is omitted below. 
     Referring to  FIG. 6 , in an embodiment, the display  630  may include a first layer that substantially reflects, absorbs, or blocks light in the infrared band. The electronic device  600  may include a flexible layer  670  of a light-transmissive material disposed between the first display region  630   a  of the display  630  and the back cover  640 . According to an embodiment, the flexible layer  670  may include a plurality of holes  671 , which may serve to facilitate the separation of the display  630  and the back cover  640 . In some embodiments, the flexible layer  670  including these holes may be referred to as an “embossed layer”. The light sensor  650  may be disposed under the display  630 , and an air layer  660  may exist between the display  630  and the light sensor  650 . 
     According to an embodiment, by the media coupled to the rear face of the display  630 , a second interface  602  between the second display region  630   b  and the air layer  660 , a third interface  603  between the air layer  660  and the light sensor  650 , a fourth interface  604  between the first display region  630   a  and the flexible layer  670 , and a fifth interface  605  between the flexible layer  670  and the back cover  640  may be formed. The fourth interface  604  may include an a-interface  604   a  between the first display region  630   a  and the air in the holes  671  and a b-interface  604   b  between the first display region  630   a  and a region  672  other than the holes  671 . The fifth interface  605  may include a c-interface  605   c  between the air in the holes  671  and the bag cover  640  and a d-interface  605   d  between the region  672  other than the holes  671  and the bag cover  640 . The reflectivity of an interface  602 ,  603 ,  604   a ,  604   b ,  605   a , or  605   b  may be determined based on the refractive indexes of two media forming the interface. 
     According to an embodiment, when external light such as sunlight is incident on the display  630 , some of the external light may be reflected, absorbed, or blocked by the first layer, and the remaining external light (e.g., light in the visible light band or light in the ultraviolet band) may pass through the display  630 . Light passing through the display  630  may be reflected from the second interface  602  and the fourth interface  604 . Light passing through the flexible layer  670  may be reflected from the fifth interface  605 . In addition, light passing through the display  660  may be reflected from the third interface  603 . 
     According to an embodiment, light passing through the display  630  may be reflected from first medium layers  6001  including the fourth interface  604  and the fifth interface  605 , and reflected light having a first light amount may be introduced into the first display region  630   a . In addition, light passing through the display  630  may be reflected from second medium layers  6002  including the second interface  602  and the third interface  603 , and reflected light having a second light amount may be introduced into the second display region  630   b . According to an embodiment, the first light amount reflected from the first medium layers  6001  and the second light amount reflected from the second medium layers  6002  may be different from each other. According to an embodiment, when the first light amount and the second light amount are different from each other, it may mean that the difference between the first light amount and the second light amount exceeds a set threshold. For example, the average reflectivity of the fourth interface  604  including the a-interface  604   a  and the b-interface  604   b  may be about 1.7%, and the average reflectivity of the second interface  602  or the third interface  603  may be about 4%. Due to this, the second light amount may be greater than the first light amount. 
     According to an embodiment, when the first light amount of the reflected light transmitted to the first display region  630   a  and the second light amount of the reflected light transmitted to the second display region  630   b  are different, the first display due to the electrical influence of the reflected light The luminance change of the region  630   a  and the luminance change of the second display region  630   b  may not be the same. For example, due to the reflected light, the second display region  630   b  may emit light having a lower luminance than the first display region  630   a , which may make it difficult to ensure image quality. 
     According to an embodiment, although not illustrated, in order to ensure that the first light amount and the second light amount are substantially the same, at least one medium layer (not illustrated) may be interposed in at least one of the second interface  602 , the third interface  603 , the fourth interface  604 , and the fifth interface  605 . A structure in this regard will be described below with reference to  FIG. 7 . 
       FIG. 7  is a cross-sectional view of a portion of the electronic device including a display according to an embodiment. At least one of the components of the electronic device  700  may be the same as or similar to at least one of the components of the electronic device  600  of  FIG. 6 , and a redundant description is omitted below. 
     Referring to  FIG. 7 , the display  730  may include a first layer that substantially reflects, absorbs, or blocks light in the infrared band. The electronic device  700  may include a flexible layer  770  (e.g., the layer  370  in  FIG. 3 ) of a light-transmissive material coupled to the rear face of the display  730 . According to an embodiment, the flexible layer  770  may include a first region  770   a  coupled to the first display region  730   a  of the display  730  and a second display region  770   b  coupled to the second display region  730   b  of the display  730 . 
     In an embodiment, the electronic device  700  may include a back cover  740  aligned under the first region  770   a . According to an embodiment, the electronic device  700  may include a second layer  780  disposed between the flexible layer  770  and the back cover  740 . According to an embodiment, the second layer  780  may include an anti-reflection material for suppressing light reflection and improving transmittance. According to an embodiment, the second layer  780  may be a film disposed under the flexible layer  770 , and may be coupled to the flexible layer  770  via optically transparent adhesive or the like. According to some embodiments, the second magnet  780  may include a material coated on the flexible layer  770 . 
     According to an embodiment, the electronic device  700  may include a third layer  790  disposed between the air layer  760  and the light sensor  750 . The third layer  790  may include an anti-reflection material for suppressing light reflection and improving transmittance. According to an embodiment, the third layer  790  may be a film disposed under the flexible layer  750 , and may be coupled to the flexible layer  750  via optically transparent adhesive or the like. According to some embodiments, the third layer  790  may include a material coated on the light sensor  750 . 
     According to an embodiment, the second layer  780  or the third layer  790  may be formed of various materials having a reflectivity of about 1% or less, a transmittance of about 99%, or an absorbance of about 2% or less in air. 
     According to an embodiment, the electronic device  700  may include a light sensor  750  aligned under the first region  770   a  of the flexible layer  770 , and an air layer  660  may exist between the display  730  and the light sensor  750 . Light output from the light sensor  750  may be emitted to the outside through the air layer  760 , the second region  770   b , the second display region  730   b , and at least one layer coupled thereto. The light reflected from the external object may be introduced into the light sensor  750  through the second display area  730   b , the second region  770   b , the air layer  760 , and at least one layer coupled thereto. 
     According to an embodiment, the first region  770   a  of the flexible layer  770  may include a plurality of holes  771 , and the second region  770   b  of the flexible layer  770  may not include such holes. When the second region  770   b  is not include holes unlike the first region  770   a , the second region  770   b  may have a substantially uniform light transmittance throughout the same, which may prevent the performance deterioration of the light sensor  750 . 
     According to an embodiment, by the media coupled to the rear face of the display  730 , a sixth interface  706  between the first display region  730   a  and the flexible layer  770 , a seventh interface  707  between the flexible layer  770  and the second layer  780 , and an eighth interface  708  between the second layer  780  and the back cover  740  may be formed. The sixth interface  706  may include an e-interface  706   e  between the first display region  730   a  and the air in the holes  771  and an f-interface  706   f  between the first display region  730   a  and a region  772  other than the holes  771 . The seventh interface  707  may include a g-interface  707   a  between the air in the holes  771  and the second layer  780  and an h-interface  707   h  between the region  772  other than the holes  771  and the second layer  780 . In addition, according to the structure of  FIG. 7 , a ninth interface  708  between the second display region  730   b  and the flexible layer  770 , a tenth interface between the flexible layer  770  and the second layer  780 , an eleventh interface  711  between the second layer  780  and the air layer  760 , a twelfth interface  712  between the air layer  760  and the third layer  790 , and a thirteenth interface  713  between the third layer  790  and the light sensor  750  may be formed. The reflectivity of an interface  706   a ,  706   b ,  707   a ,  707   b ,  708 ,  709 ,  710 ,  711 ,  712 , or  713  may be determined based on the refractive indexes of two media forming the interface. 
     According to an embodiment, when external light such as sunlight is incident on the display  730 , some of the external light may be reflected, absorbed, or blocked by the first layer, and the remaining external light (e.g., light in the visible light band or light in the ultraviolet band) may pass through the display  730 . Light passing through the display  730  may be reflected from the sixth interface  706  and the ninth interface  709 . Light passing through the flexible layer  770  may be reflected from the eighth interface  708  and the eleventh interface  711 . Light passing through the display  760  may be reflected from the twelfth interface  712 , and light passing through the third layer  790  may be reflected from the thirteenth interface  713 . 
     According to an embodiment, light passing through the display  730  may be reflected from third medium layers  7003  including the sixth interface  706 , the seventh interface  707 , and the eighth interface  708 , and reflected light having a first light amount may be introduced into the first display region  730   a . In addition, light passing through the display  730  may be reflected from fourth medium layers  7004  including the ninth interface  709 , the tenth interface  710 , the eleventh interface  711 , the twelfth interface  712 , and the thirteenth interface  713 , and reflected light having a fourth light amount may be introduced into the second display region  730   b.    
     According to an embodiment, in comparison with the electronic device  600  of  FIG. 6 , the electronic device  700  of  FIG. 7  may have a structure in which the flexible layer  770  extends to the second display region  730   b  and the second layer  780  or the third layer  790  including an anti-reflection material is added. Due to this, the total reflectivity in the third medium layers  7003  including the sixth interface  706 , the seventh interface  707 , and the eighth interface  708 , and the total reflectivity in the fourth medium layers  7004  including the ninth interface  709 , the tenth interface  710 , the eleventh interface  711 , the twelfth interface  712 , and the thirteenth interface  713  may be substantially the same. The total reflectivity of the third medium layers  7003  may be defined as a ratio of the amount of light reflected from the display  730  to the amount of light incident on the sixth interface  7006  through the display  730 . The total reflectivity of the fourth medium layers  7004  may be defined as a ratio of the amount of light reflected from the display  730  to the amount of light incident on the ninth interface  7009  through the display  730 . When the total reflectivity of the third medium layers  7003  and the total reflectance of the fourth medium layers  7004  are substantially the same, it may mean that the difference between the total reflectivities does not exceed a set threshold. 
     According to an embodiment, when the third light amount reflected from the third medium layers  7003  and the fourth light amount reflected from the fourth medium layers  7004  may be substantially the same, and the luminance change of the first display region  730   a  and the luminance change of the second display region  730   b , which are caused by the electrical influence of reflected light, may be substantially constant. 
     Accordingly, since the display  730  has a substantially evenly reduced luminance over the entire region thereof, it is possible to improve image quality compared to the display  630  of  FIG. 6 . When the third light amount and the fourth light amount are substantially the same, it may mean that the difference between the third light amount and the fourth light amount does not exceed a set threshold. 
     According to some embodiments, the third layer  790  may be designed as a polarization layer and/or a phase retardation layer instead of the anti-reflection material. For example, the third layer  790  may include a polarization layer and a phase retardation layer disposed under the polarization layer. In another example, the third layer  790  may include a phase retardation layer and a phase retardation layer disposed under the polarization layer. According to some embodiments, the third layer may be formed as a single layer (e.g., a circularly polarized layer) in which a polarization layer and a phase retardation layer are combined. 
     According to some embodiments, the third layer  790  may further include a polarization layer and/or a phase retardation layer. For example, the third layer  790  may include a polarization layer and an anti-reflection material layer (hereinafter, referred to as an anti-reflection layer) disposed on or under the polarization layer. In another example, the third layer  790  may include a phase retardation layer and an anti-reflection layer disposed on or under the polarization layer. In another example, the third layer  790  may include a polarization layer, a phase retardation layer disposed under the polarization layer, and an anti-reflection layer disposed on the polarization layer, under the phase retardation layer, or between the polarization layer and the phase retardation layer. In another example, the third layer  790  may include a phase retardation layer, a polarization layer disposed under the phase retardation layer, and an anti-reflection layer disposed on the phase retardation layer, under the polarization layer, or between the phase retardation layer and the polarization layer. According to some embodiments, the third layer  790  may be formed as a single layer in which a polarization layer, a phase retardation layer, and an anti-reflection layer are combined. 
     According to an embodiment, when unpolarized light such as sunlight enters the display  730 , the unpolarized light may pass through a polarization layer (e.g., the polarization layer  333  in  FIG. 3 ) of the display  730  to be changed into linearly polarized light, this linearly polarized light passes through the phase retardation layer  332  to be changed to circularly polarized light, and this circularly polarized light may be incident on the third layer  790 . According to an embodiment, the third layer  790  including the polarization layer and/or the phase retardation layer may reduce or block the circularly polarized light, which is reflected from the light sensor  750  and exits toward the display  730 . When the reflected light, which is reflected from the light sensor  750  and exits toward the display  730 , is reduced by the third layer  790 , the third amount of light reflected from the third medium layers  7004  and introduced into the first display region  730   a  and the fourth light amount reflected from the fourth medium layers  7004  and introduced into the second display region  730   b  may be substantially the same. When the third light amount and the fourth light amount become substantially the same, the luminance change of the first display region  730   a  and the luminance change of the second display region  730   b , which are caused by the electrical influence of reflected light, may be substantially the same. Due to the electrical influence of the reflected light, the display  730  has a substantially evenly reduced luminance over the entire region, and thus, when external light such as sunlight is incident, it is possible to ensure the image quality of the display  730 . 
     According to some embodiments, the anti-reflection material layer may be defined as a higher concept including a polarization layer and/or a phase retardation layer. 
     In some embodiments, by including a layer of an anti-reflective material filling the hole  741  of the back cover  740  in place of or in addition to the third layer  790 , the luminance change of the first display area  730   a  and the luminance change of the second display area  730   b , which are caused due to the electrical influence of the reflected light, may be made constant. 
     Referring to  FIG. 4 , according to some embodiments, at least one face of the semiconductor layer  424  may be coated with a light-blocking material so as to suppress the luminance decrease of the display panel  331  caused by external light. According to an embodiment, when the rear face or the side face of the semiconductor layer  424  is coated with a light-blocking material, the luminance change of the first display area  730   a  and the luminance change of the second display area  730 , which are caused due to the electrical influence of reflected light, may be made constant. 
     According to an embodiment of the disclosure, an electronic device  700  may include: a transparent layer  310 ; a display panel  331  disposed under the transparent layer  310 , and including a pixel layer  410  including a plurality of pixels configured to output light in a visible light band for displaying a content through the transparent layer  310 , and a substrate layer  420  disposed under the pixel layer  410  and including a plurality of switches capable of driving the plurality of pixels; a biometric sensor  750  disposed under at least part of the display panel  331 , the biometric sensor  750  being configured to acquire biometric information using at least some of reflected light obtained when at least some of light output through at least some of the plurality of pixels is reflected from an external object; and a coating (e.g., the first layer  320  in  FIG. 3 ) configured to reflect external light in an infrared band, transmitted to the substrate layer  420 , and to transmit light in the visible light band. The coating  320  may be formed between the transparent layer  310  and the display panel  331 . 
     According to an embodiment of the disclosure, the electronic device  700  may further include a light-blocking layer  740  disposed along the rear face of the display panel  331 , and the light-blocking layer  740  may include a hole  741  aligned with the biometric sensor. 
     According to an embodiment of the disclosure, the electronic device  700  may further include a flexible transparent layer  770  disposed between the display panel  331  and the light-blocking layer  740 . 
     According to an embodiment of the disclosure, the flexible transparent layer  770  may include a plurality of holes  771  formed in a portion that is not aligned with the hole  741  in the light-blocking layer  740 . 
     According to an embodiment of the disclosure, the electronic device  700  may further include an anti-reflection layer  790  disposed between the flexible transparent layer  770  and the light-blocking layer  740  and configured to prevent reflection of external light. 
     According to an embodiment of the disclosure, the electronic device  700  may further include an anti-reflection layer  790  disposed between the hole  741  in the light-blocking layer  740  and the biometric sensor  750  and configured to prevent reflection of external light. 
     According to an embodiment of the disclosure, the anti-reflection member  780  may include at least one of a polarization layer and a phase retardation layer. 
     According to an embodiment of the disclosure, the transparent layer  310  may include a material for reflecting, absorbing, or blocking light in the ultraviolet band. 
     According to an embodiment of the disclosure, the display panel  331  may be an active matrix organic light-emitting diodes (AMOLED) panel. 
     According to an embodiment, the biometric sensor  750  may be a fingerprint sensor. 
     According to an embodiment of the disclosure, the electronic device  700  may display a home button through a portion of the display panel  331  aligned with the fingerprint sensor. 
     According to an embodiment of the disclosure, an electronic device  700  may include: a transparent layer  310 ; a display panel  331  disposed under the transparent layer  310 , and including a plurality of pixels configured to output light in a visible light band for displaying a content through the transparent layer  310 ; a biometric sensor  750  disposed under at least part of the display panel  331  and configured to acquire biometric information using at least some of reflected light obtained when at least some of light output through at least some of the plurality of pixels is reflected from an external object; and an anti-reflection member configured to prevent reflection of external light introduced through the transparent layer  310  and the display panel  331 . The anti-reflection member may be disposed between the display panel and the biometric sensor. 
     According to an embodiment of the disclosure, the electronic device  700  may further include anti-reflection coating, and the anti-reflection coating  790  may be formed on at least a portion of the biometric sensor  750 . 
     According to an embodiment of the disclosure, the anti-reflection member  780  may be a film or may include a material coated on at least one layer between the display panel  331  and the biometric sensor  750 . 
     According to an embodiment of the disclosure, the anti-reflection member  780  may include at least one of a polarization layer and a phase retardation layer formed on at least a portion of the biometric sensor  750 . 
     According to an embodiment of the disclosure, the electronic device  700  may further include a light-blocking layer  740  disposed along the rear face of the display panel  331 , and the light-blocking layer  740  may include a hole  741  aligned with the biometric sensor  750 . 
     According to an embodiment of the disclosure, the electronic device  700  may further include a flexible transparent layer  770  disposed between the display panel  331  and the light-blocking layer  740 . 
     According to an embodiment of the disclosure, the flexible transparent layer  770  may include a plurality of holes  771  formed in a portion that is not aligned with the hole  741  in the light-blocking layer  740 . 
     According to an embodiment of the disclosure, the electronic device  700  may further include an anti-reflection layer  780  disposed between the flexible transparent layer  770  and the light-blocking layer  740 . 
     According to an embodiment of the disclosure, the electronic device  700  may further include a layer  320  disposed between the transparent layer  310  and the display panel  331  and configured to reflect light in an infrared band. 
     The disclosure has been described above by way of exemplary embodiments. Those skilled in the art will appreciate that various modifications and changes may be made without departing from the essential spirit and scope of the disclosure. Therefore, the embodiments disclosed herein should be considered not from limitative viewpoints but from illustrative viewpoints. The scope of the disclosure should be determined not by the above description but by the appended claims, and all differences equivalent to the claims shall be construed as falling within the scope of the disclosure.