Patent Publication Number: US-2022223677-A1

Title: Display device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from and the benefit of Korean Patent Application No. 10-2021-0005046, filed on Jan. 14, 2021, which is hereby incorporated by reference for all purposes as if fully set forth herein. 
     BACKGROUND 
     Field 
     Embodiments of the invention relate generally to a display device. More particularly, embodiments relate to a display device in which a hole is formed in a display area. 
     Discussion of the Background 
     A display device may include a display area in which an image is displayed and a non-display area positioned outside the display area. Pixels for displaying an image and lines connected to the pixels may be disposed in the display area. Drivers for driving the pixels and functional modules, such as a camera module and a sensor module, may be disposed in the non-display area. 
     A hole may be formed in the display area to reduce dead space caused by the non-display area. The functional module may be disposed on a lower surface of the display device to correspond to the hole, and the functional module may detect or recognize an object or a user located in front of the display device through the hole. When the hole is formed in the display area, lines disposed in the display area may bypass the hole. Accordingly, lines are disposed adjacent to the edge of the hole so that an image is not displayed, and a hole edge area surrounding the hole may be formed. 
     The above information disclosed in this Background section is only for understanding of the background of the inventive concepts, and, therefore, it may contain information that does not constitute prior art. 
     SUMMARY 
     Embodiments provide a display device in which a hole is formed in a display area. 
     Additional features of the inventive concepts will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the inventive concepts. 
     An embodiment of the invention provides a display device including a substrate, a plurality of first data lines and a plurality of second data lines. The substrate includes a display area, in which a hole is formed, and a hole edge area surrounding the hole. The plurality of first data lines are disposed on the substrate; extend in a first direction in the display area; are arranged in a second direction orthogonal to the first direction; and bypass the hole along the hole edge area. The plurality of second data lines are disposed on the substrate; extend in the first direction in the display area; are arranged adjacent to the plurality of first data lines; and bypass the hole along hole edge area. In the hole edge area, each of the plurality of first data lines and the plurality of second data lines are disposed on three layers different from each other. 
     In the hole edge area, the plurality of first data lines may overlap with each other on a plane, and the plurality of second data lines may overlap with each other on the plane. 
     In the hole edge area, the plurality of first data lines may be aggregated with each other, and the plurality of second data lines may be aggregated with each other. 
     Each of the plurality of first data lines may be connected to one side or another side of each of a plurality of first pixels arranged in a first row of the display area. Each of the plurality of second data lines may be connected to one side or another side of each of a plurality of second pixels arranged in a second row positioned in the first direction from the first row of the display area. 
     In the hole edge area, at least one of the plurality of first data lines may cross at least one of the plurality of second data lines. 
     The hole may have a circular shape. The hole edge area may have a circular annular shape. 
     Each of the plurality of first data lines and the plurality of second data lines may include a first line disposed on the substrate, a second line disposed on the first line, and a third line disposed on the second line. 
     The first line, the second line, and the third line may extend in the first direction, and may be repeatedly arranged in an order of the first line, the second line, and the third line along the second direction. 
     The display device may further include a metal layer disposed in the display area on the substrate, an active layer disposed on the metal layer, a gate electrode disposed on the active layer, a capacitor electrode disposed on the gate electrode, a drain electrode disposed on the capacitor electrode and connected to the active layer, and a connection electrode disposed on the drain electrode and connected to the drain electrode. 
     In the hole edge area, the first line may be disposed on a same layer as the metal layer, the second line may be disposed on a same layer as the drain electrode, and the third line may be disposed on a same layer as the connection electrode. 
     The display device may further include an initialization voltage line. The initialization voltage line may be disposed on the substrate, may extend in the second direction in the display area, and may bypass the hole along the hole edge area. 
     In the hole edge area, the initialization voltage line may be disposed on a same layer as the capacitor electrode. 
     The display device may further include a scan line. The scan line may be disposed on the substrate, may extend in the second direction in the display area, and may bypass the hole along the hole edge area. 
     In the hole edge area, the scan line may be disposed on a same layer as the gate electrode. 
     Another embodiment of the invention provides a display device including a substrate, a plurality of first data lines, and a plurality of second data lines. The substrate includes a display area, in which a hole is formed, and a hole edge area surrounding the hole. The plurality of first data lines are disposed on the substrate; extend in a first direction in the display area; are arranged in a second direction orthogonal to the first direction; and bypass the hole along the hole edge area. The plurality of second data lines are disposed on the substrate; extend in the first direction in the display area; are arranged adjacent to the plurality of first data lines; and bypass the hole along hole edge area. In the hole edge area, each of the plurality of first data lines and the plurality of second data lines are disposed on four layers different from each other. 
     Each of the plurality of first data lines may be connected to one side or another side of each of a plurality of first pixels arranged in a first row of the display area. Each of the plurality of second data lines may be connected to one side or another side of each of a plurality of second pixels arranged in a second row located in the first direction from the first row of the display area. 
     Each of the plurality of first data lines and the plurality of second data lines may include a first line disposed on the substrate, a second line disposed on the first line, a third line disposed on the second line, and a fourth line disposed on the third line. 
     The first line, the second line, the third line, and the fourth line may extend in the first direction in the display area, and may be repeatedly arranged in an order of the first line, the second line, the third line, and third line, and the fourth line. 
     The display device may further include a metal layer disposed in the display area on the substrate, an active layer disposed on the metal layer, a gate electrode disposed on the active layer, a capacitor electrode disposed on the gate electrode, a drain electrode disposed on the capacitor electrode and connected to the active layer, and a connection electrode disposed on the drain electrode and connected to the drain electrode. 
     In the hole edge area, the first line may be disposed on a same layer as the metal layer, the second line may be disposed on a same layer as the capacitor electrode, the third line may be disposed on a same layer as the drain electrode, and the fourth line may be disposed on a same layer as the connection electrode. 
     In the display device according to embodiments, in a hole edge area, as each of first data lines and second data lines is disposed on three different layers from each other, an area occupied by the first data lines and the second data lines in the hole edge area may be reduced. Accordingly, a dead space of the display device may be reduced. 
     It is to be understood that both the foregoing general description and the following detailed description are illustrative and explanatory and are intended to provide further explanation of the invention as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate illustrative embodiments of the invention, and together with the description serve to explain the inventive concepts. 
         FIG. 1  is a block diagram illustrating a display device according to an embodiment. 
         FIG. 2  is a plan view illustrating a part of a display device according to an embodiment. 
         FIG. 3  is a cross-sectional view illustrating a display area of the display device of  FIG. 2 . 
         FIG. 4  is a plan view illustrating an enlarged view of area “A” of  FIG. 2 . 
         FIG. 5  is a plan view illustrating an enlarged view of area “B” of  FIG. 2 . 
         FIG. 6  is a cross-sectional view taken along line I-I′ of  FIG. 4 . 
         FIG. 7  is a plan view illustrating a part of a display device according to an embodiment. 
         FIG. 8  is a plan view illustrating an enlarged view of area “C” of  FIG. 7 . 
         FIG. 9  is a cross-sectional view taken along line II-II′ of  FIG. 8 . 
         FIG. 10  is a plan view illustrating a part of a display device according to an embodiment. 
         FIG. 11  is a cross-sectional view illustrating an electronic device according to an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of various embodiments or implementations of the invention. As used herein “embodiments” and “implementations” are interchangeable words that are non-limiting examples of devices or methods employing one or more of the inventive concepts disclosed herein. It is apparent, however, that various embodiments may be practiced without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring various embodiments. Further, various embodiments may be different, but do not have to be exclusive. For example, specific shapes, configurations, and characteristics of an embodiment may be used or implemented in another embodiment without departing from the inventive concepts. 
     Unless otherwise specified, the illustrated embodiments are to be understood as providing illustrative features of varying detail of some ways in which the inventive concepts may be implemented in practice. Therefore, unless otherwise specified, the features, components, modules, layers, films, panels, regions, and/or aspects, etc. (hereinafter individually or collectively referred to as “elements”), of the various embodiments may be otherwise combined, separated, interchanged, and/or rearranged without departing from the inventive concepts. 
     The use of cross-hatching and/or shading in the accompanying drawings is generally provided to clarify boundaries between adjacent elements. As such, neither the presence nor the absence of cross-hatching or shading conveys or indicates any preference or requirement for particular materials, material properties, dimensions, proportions, commonalities between illustrated elements, and/or any other characteristic, attribute, property, etc., of the elements, unless specified. Further, in the accompanying drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. When an embodiment may be implemented differently, a specific process order may be performed differently from the described order. For example, two consecutively described processes may be performed substantially at the same time or performed in an order opposite to the described order. Also, like reference numerals denote like elements. 
     When an element, such as a layer, is referred to as being “on,” “connected to,” or “coupled to” another element or layer, it may be directly on, connected to, or coupled to the other element or layer or intervening elements or layers may be present. When, however, an element or layer is referred to as being “directly on,” “directly connected to,” or “directly coupled to” another element or layer, there are no intervening elements or layers present. To this end, the term “connected” may refer to physical, electrical, and/or fluid connection, with or without intervening elements. Further, the D 1 -axis, the D 2 -axis, and the D 3 -axis are not limited to three axes of a rectangular coordinate system, such as the x, y, and z-axes, and may be interpreted in a broader sense. For example, the D 1 -axis, the D 2 -axis, and the D 3 -axis may be perpendicular to one another, or may represent different directions that are not perpendicular to one another. For the purposes of this disclosure, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” may be construed as X only, Y only, Z only, or any combination of two or more of X, Y, and Z, such as, for instance, XYZ, XYY, YZ, and ZZ. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     Although the terms “first,” “second,” etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another element. Thus, a first element discussed below could be termed a second element without departing from the teachings of the disclosure. 
     Spatially relative terms, such as “beneath,” “below,” “under,” “lower,” “above,” “upper,” “over,” “higher,” “side” (e.g., as in “sidewall”), and the like, may be used herein for descriptive purposes, and, thereby, to describe one elements relationship to another element(s) as illustrated in the drawings. Spatially relative terms are intended to encompass different orientations of an apparatus in use, operation, and/or manufacture in addition to the orientation depicted in the drawings. For example, if the apparatus in the drawings is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the term “below” can encompass both an orientation of above and below. Furthermore, the apparatus may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and, as such, the spatially relative descriptors used herein interpreted accordingly. 
     The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms, “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Moreover, the terms “comprises,” “comprising,” “includes,” and/or “including,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It is also noted that, as used herein, the terms “substantially,” “about,” and other similar terms, are used as terms of approximation and not as terms of degree, and, as such, are utilized to account for inherent deviations in measured, calculated, and/or provided values that would be recognized by one of ordinary skill in the art. 
     Various embodiments are described herein with reference to sectional and/or exploded illustrations that are schematic illustrations of idealized embodiments and/or intermediate structures. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments disclosed herein should not necessarily be construed as limited to the particular illustrated shapes of regions, but are to include deviations in shapes that result from, for instance, manufacturing. In this manner, regions illustrated in the drawings may be schematic in nature and the shapes of these regions may not reflect actual shapes of regions of a device and, as such, are not necessarily intended to be limiting. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure is a part. Terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense, unless expressly so defined herein. 
       FIG. 1  is a block diagram illustrating a display device according to an embodiment.&#39; 
     Referring to  FIG. 1 , the display device  100  according to an embodiment may include a display portion  110 , a scan driver  120 , a data driver  130 , and a power supply  140 , a timing controller  150 , and the like. The display portion  110  may be located at an intersection of a plurality of scan lines SL 1  and SL 2 , a plurality of first data lines DL 1   a  and DL 1   b , a plurality of second data lines DL 2   a  and DL 2   b , and a plurality of initialization voltage lines VL 1  and VL 2 . The display portion  110  may include a plurality of first pixels PX 1  and a plurality of second pixels PX 2  arranged in a substantially matrix form. The plurality of scan lines SL 1  and SL 2  and the plurality of initialization voltage lines VL 1  and VL 2  may generally extend in a row direction, and the plurality of first data lines DLla and DL 1   b  and the plurality of second data lines DL 2   a  and DL 2   b  may generally extend in a column direction. 
     The pixels PX 1  and PX 2  may be connected to the scan lines SL 1  and SL 2 , the first data lines DLla and DL 1   b , the second data lines DL 2   a  and DL 2   b , and the initialization voltage lines VL 1  and VL 2 . The pixels PX 1  and PX 2  may include the plurality of first pixels PX 1  and the plurality of second pixels PX 2 . According to an embodiment, the plurality of first data lines DLla and DL 1   b  may be connected to one side or another side of each of the plurality of first pixels PX 1  arranged in a first row, and the plurality of second data lines DL 2   a  and DL 2   b  may be connected to one side or another side of each of the plurality of second pixels PX 2  arranged in a second row located in a first direction D 1  from the first row. For example, each of the plurality first pixels PX 1  and the plurality of second pixels PX 2  may display any one color of red, green, and blue. 
     The scan driver  120  may be connected to the scan lines SL 1  and SL 2 . The scan lines SL 1  and SL 2  may include a plurality of first scan lines SL 1  and a plurality of second scan lines SL 2 . The scan driver  120  may transmit a scan signal to the plurality of pixels PX 1  and PX 2  through the plurality of scan lines SL 1  and SL 2 . 
     The data driver  130  may be connected to the plurality of first data lines DLla and DLlb and the plurality of second data lines DL 2   a  and DL 2   b . The data driver  130  may transmit data signals to the plurality of first pixels PX 1  through the plurality of first data lines DLla and DLlb. The data driver  130  may transmit data signals to the plurality of second pixels PX 2  through the plurality of second data lines DL 2   a  and DL 2   b.    
     The data signals may be supplied to the plurality of pixels PX 1  and PX 2  selected by the scan signals whenever the scan signals are supplied to the plurality of scan lines SL 1  and SL 2 . 
     The plurality of pixels PX 1  and PX 2  may receive a driving voltage ELVDD and a common voltage ELVSS from the power supply  140 . The driving voltage ELVDD may be a predetermined high level voltage and the common voltage ELVSS may be a voltage lower than the driving voltage ELVDD or a ground voltage. In addition, the power supply  140  may be connected to the plurality of initialization voltage lines VL 1  and VL 2 . The initialization voltage lines VL 1  and VL 2  may include a plurality of first initialization voltage lines VL 1  and a plurality of second initialization voltage lines VL 2 . The power supply  140  may provide an initialization voltage to the plurality of pixels PX 1  and PX 2  through the plurality of initialization voltage lines VL 1  and VL 2 . 
     The timing controller  150  may convert image signals transmitted from an outside source into image data signals and transmit the image data signals to the data driver  130 . In addition, the timing controller  150  may receive a vertical synchronization signal, a horizontal synchronization signal, and a clock signal to generate control signals for controlling driving of the scan driver  120  and the data driver  130 , and transmit the generated control signals to the scan driver  120  and the data driver  130 . 
     The pixels PX 1  and PX 2  may emit light having a predetermined luminance by a driving current supplied to a light emitting element according to the data signals transmitted through the plurality of first data lines DLla and DL 1   b  and the plurality of second data lines DL 2   a  and DL 2   b.    
     Hereinafter, for convenience, a display device including an organic light emitting diode (“OLED”) as the light emitting element will be described. However, the inventive concepts are not limited thereto, and the inventive concepts may be applied to various types of display devices, such as a liquid crystal display (“LCD”) device, an electrophoretic display (“EPD”) device, a light emitting diode (“LED”) display device, and the like. 
       FIG. 2  is a plan view illustrating a part of a display device according to an embodiment. 
     Referring to  FIGS. 1 and 2 , the display device  100  according to an embodiment may include a substrate  200  on which the pixels PX 1  and PX 2 , the lines SL 1 , SL 2 , VL 1 , VL 2 , DLla, DL 1   b , DL 2   a , and DL 2   b , the scan driver  120 , the data driver  130 , the power supply  140  and the timing controller  150  are disposed. The substrate  200  may include a display area DA, a peripheral area PA, and a hole edge area HEA. 
     The pixels PX 1  and PX 2  and lines SL 1 , SL 2 , VL 1 , VL 2 , DLla, DL 1   b , DL 2   a , and DL 2   b  may be disposed in the display area DA on the substrate  200 . The display area DA may display an image through light emitted from each of the pixels PX 1  and PX 2 . 
     The peripheral area PA may surround the display area DA. The peripheral area PA may form a bezel of the display device  100 . The scan driver  120  may be disposed in the peripheral area PA on the substrate  200 . The data driver  130 , the power supply  140 , and the timing controller  150  may be disposed in the peripheral area PA on the substrate  200 , or may be disposed on a printed circuit board or flexible printed circuit electrically connected to the substrate  200 . The peripheral area PA may be a non-display area. 
     A hole HL may be formed in the display area. The hole HL may penetrate through the substrate  200 . A functional module may be disposed under the substrate  200  corresponding to the hole HL. The functional module may receive external light passing through the hole HL or may transmit a signal such as infrared rays or ultrasonic waves. 
     According to an embodiment, the functional module may include a camera module for capturing (or recognizing) an image of an object located in front of the display device, a face recognition sensor module for detecting a face of user, a pupil recognition sensor module for detecting a pupil of the user, an acceleration sensor module and a geomagnetic sensor module for determining a movement of the display device, a proximity sensor module and an infrared sensor module for detecting proximity with respect to the front surface of the display device, and an illuminance sensor module for measuring a degree of brightness of an outside. 
     The hole edge area HEA may surround the hole HL. The lines SL 1 , SL 2 , VL 1 , VL 2 , DLla, DL 1   b , DL 2   a , and DL 2   b  may be disposed in the hole edge area HEA on the substrate  200 . The lines SL 1 , SL 2 , VL 1 , VL 2 , DL 1   a , DL 1   b , DL 2   a , and DL 2   b  may bypass the hole HL along the hole edge area HEA. For example, the lines SL 1 , SL 2 , VL 1 , VL 2 , DLla, DL 1   b , DL 2   a , and DL 2   b  may be bent or curved along a shape of the hole edge area HEA without passing through the hole HL. The pixels PX 1  and PX 2  may not be disposed in the hole edge area HEA on the substrate  200 . Accordingly, the hole edge area HEA may be a non-display area. 
     According to an embodiment, the hole HL may be formed in an upper portion of the display area DA. For example, the hole HL may be formed in a left or right upper portion of the display area DA. As described later, alternatively, the hole HL may be formed in a central upper portion of the display area DA. 
     According to an embodiment, the hole HL may have a circular shape on a plane, and the hole edge area HEA may have a circular annular shape on a plane. However, the inventive concepts are not limited thereto, and according to another embodiment, the hole HL may have a polygonal shape, an oval shape, and the like on a plane. Meanwhile, although one hole HL is formed in the display area DA in  FIG. 2 , the inventive concepts are not limited thereto, and a plurality of holes may be formed in the display area DA. 
       FIG. 3  is a cross-sectional view illustrating a display area of the display device of  FIG. 2 . For example,  FIG. 3  may represent the first pixel PX 1  or the second pixel PX 2  of the display device  100  of  FIG. 1 . 
     Referring to  FIG. 3 , the display device  100  may include a transistor TR, a capacitor CAP, a light emitting element EL, and an encapsulation layer  280  disposed on a substrate  200 . The transistor TR may include an active layer ACT, a gate electrode GE, a source electrode SE, and a drain electrode DE. The capacitor CAP may include the gate electrode GE and a capacitor electrode CE. The light emitting element EL may include a lower electrode  240 , a light emitting layer  260 , and an upper electrode  270 . 
     The substrate  200  may be a transparent insulating substrate. For example, the substrate  200  may include glass, quartz, plastic, and the like. 
     A metal layer  211  may be disposed on the substrate  200 . The metal layer  211  may serve to maintain a constant voltage characteristic of the active layer ACT of the thin film transistor TR. For example, the metal layer  211  may include a conductive material, such as titanium (Ti), molybdenum (Mo), copper (Cu), and the like. 
     A buffer layer  210  may be disposed on the substrate  200 . The buffer layer  211  may sufficiently cover the metal layer  211 . The buffer layer  210  may prevent diffusion of metal atoms or impurities from the substrate  200  to the transistor TR. For example, the buffer layer  210  may include an inorganic material, such as oxide or nitride. 
     The active layer ACT may be disposed on the buffer layer  210 . For example, the active layer ACT may include amorphous silicon, polycrystalline silicon, oxide semiconductor, and the like. The active layer ACT may include a source region, a drain region, and a channel region positioned between the source region and the drain region. The source region and the drain region may be doped with P-type or N-type impurities, and the channel region may be doped with an impurity of a type different from that of the source region and drain region. 
     A first insulating layer  220  may be disposed on the active layer ACT. The first insulating layer  220  may sufficiently cover the active layer ACT. For example, the first insulating layer  220  may include an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), silicon nitride (SiNx), silicon oxynitride (SiOxNy), silicon carbide (SiCx), and the like. 
     The gate electrode GE may be disposed on the first insulating layer  220 . The gate electrode GE may overlap the channel region of the active layer ACT. 
     The gate electrode GE may be disposed on the first insulating layer  220 . The gate electrode GE may overlap the channel region of the active layer ACT. The gate electrode GE may include a conductive material, such as a metal, an alloy of metal, and the like. For example, the gate electrode GE may include molybdenum (Mo), copper (Cu), and the like. 
     A second insulating layer  221  may be disposed on the gate electrode GE. The second insulating layer  221  may sufficiently cover the gate electrode GE and may be disposed on the first insulating layer  220 . For example, the second insulating layer  221  may include an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, silicon carbide, and the like. 
     The capacitor electrode CE may be disposed on the second insulating layer  221 . The capacitor electrode CE may overlap the gate electrode GE. The capacitor electrode CE may include a conductive material, such as a metal, an alloy of metal, and the like. For example, the capacitor electrode CE may include molybdenum (Mo), copper (Cu), and the like. 
     A third insulating layer  222  may be disposed on the capacitor electrode CE. The third insulating layer  222  may sufficiently cover the capacitor electrode CE and may be disposed on the second insulating layer  221 . For example, the third insulating layer  222  may include an inorganic insulating material, such as silicon oxide, silicon nitride, silicon oxynitride, silicon carbide, and the like. 
     The source electrode SE and the drain electrode DE may be disposed on the third insulating layer  222 . The source electrode SE may be electrically connected to the source region of the active layer ACT. The drain electrode DE may be electrically connected to the drain region of the active layer ACT. In addition, the drain electrode DE may be electrically connected to the metal layer  211 . Each of the source electrode SE and the drain electrode DE may include a conductive material, such as a metal, an alloy of a metal, and the like. For example, each of the source electrode SE and the drain electrode DE may include aluminum (Al), titanium (Ti), copper (Cu), and the like. 
     A fourth insulating layer  223  may be disposed on the source electrode SE and the drain electrode DE. The fourth insulating layer  223  may cover the source electrode SE and the drain electrode DE and may be disposed on the third insulating layer  222 . The fourth insulating layer  223  may protect the transistor TR and may provide a flat surface on the transistor TR. Accordingly, the fourth insulating layer  223  may have a relatively large thickness. For example, the fourth insulating layer  223  may include an organic insulating material, such as polyimide (PI), and the like. 
     A connection electrode  230  may be disposed on the fourth insulating layer  223 . The connection electrode  230  may be electrically connected to the source electrode SE or the drain electrode DE. The connection electrode  230  may include a conductive material, such as a metal, an alloy of metal, and the like. For example, the connection electrode  230  may include aluminum (Al), titanium (Ti), copper (Cu), and the like. 
     A fifth insulating layer  224  may be disposed on the connection electrode  230 . The fifth insulating layer  224  may sufficiently cover the connection electrode  230  and may be disposed on the fourth insulating layer  223 . For example, the fifth insulating layer  224  may include an organic insulating material such as polyimide (PI), and the like. 
     The lower electrode  240  may be disposed on the fifth insulating layer  224 . The lower electrode  240  may be electrically connected to connection electrode  230 . For example, the lower electrode  240  may include a conductive material, such as a metal, a transparent conductive oxide, and the like. 
     A pixel defining layer  250  may be disposed on the lower electrode  240  and the fifth insulating layer  224 . The pixel defining layer  250  may include an opening exposing a central portion of the lower electrode  240 . For example, the pixel defining layer  250  may include an organic insulating material, such as polyimide (PI), and the like. 
     The light emitting layer  260  may be disposed on the lower electrode  240 . That is, the light emitting layer  260  may be disposed on the lower electrode  240  exposed by the opening. The light emitting layer  260  may be formed using at least one of light emitting materials capable of emitting red light, green light, and blue light. 
     For example, the light emitting layer  260  may include a low molecular weight organic compound or a high molecular weight organic compound. For example, the low molecular weight organic compound may include copper phthalocyanine, N, N′-diphenylbenzidine, tris-(8-hydroxyquinoline)aluminum, and the like, and the high molecular weight organic compound may include poly(3,4-ethylenedioxythiophene), polyaniline, poly-phenylenevinylene, polyfluorene, and the like. 
     The upper electrode  270  may be disposed on the light emitting layer  260  and the pixel defining layer PDL. The upper electrode  270  may face the lower electrode  240  with the light emitting layer  260  interposed therebetween. The upper electrode  270  may include a conductive material, such as a metal, a transparent conductive oxide, and the like. Since the lower electrode  240  is electrically connected to the connection electrode  230 , the light emitting element EL may be electrically connected to the connection electrode  230 . 
     An encapsulation layer  280  may be disposed on the upper electrode  270 . The encapsulation layer  280  may include at least one inorganic layer and at least one organic layer. The encapsulation layer  280  is disposed on the light emitting element EL to block impurities from outside from flowing into the light emitting element EL, and protect the light emitting element EL from external impact. 
     For example, the organic layer may include a cured polymer, such as polyacrylate (PAR), and the like. For example, the inorganic layer may include silicon oxide (SiOx), silicon nitride (SiNx), silicon carbide (SiCx), aluminum oxide (AlOx), tantalum oxide (TaOx), hafnium oxide (HfOx), zirconium oxide (ZrOx), titanium oxide (TiOx), and the like. 
       FIG. 4  is a plan view illustrating an enlarged view of area “A” of  FIG. 2 .  FIG. 5  is a plan view illustrating an enlarged view of area “B” of  FIG. 2 .  FIGS. 4 and 5  may represent the scan lines SL 1  and SL 2 , the initialization voltage lines VL 1  and VL 2 , the first data lines DLla and DL 1   b , and the second data lines DL 2   a  and DL 2   b  of the display device  100  of  FIG. 1 . For example,  FIG. 4  may represent an upper side of the hole HL of the display device  100  of  FIG. 2 , and  FIG. 5  may represent a left side of the hole HL of the display device  100  of  FIG. 2 . 
     Referring to  FIGS. 1, 2, 4, and 5 , the scan lines SL 1  and SL 2 , the initialization voltage lines VL 1  and VL 2 , the first data lines DLla and DL 1   b , and the second data lines DL 2   a  AND DL 2  may be disposed in the display area DA and the hole edge area HEA on the substrate  200 . The first data lines DLla and DL 1   b  may include the (1-1)-th data lines DLla connected to one side of each of the first pixels PX 1  and the (1-2)-th data lines DL 1   b  connected to another side of each of the first pixels PX 1 . The second data lines DL 2   a  and DL 2   b  may include the 2-1 data lines DL 2   a  connected to one side of each of the second pixels PX 2  and the 2-2 data lines DL 2   b  connected to another side of each of the second pixels PX 2 . 
     The first data lines DLla and DL 1   b  may extend in a first direction D 1  in the display area DA and may be arranged in a second direction D 2  orthogonal to the first direction D 1 . The first data lines DL 1   a  and DL 1   b  may bypass the hole HL along the hole edge area HEA. 
     The second data lines DL 2   a  and DL 2   b  may extend in the first direction D 1  in the display area DA and may be arranged adjacent to the first data lines DLla and DL 1   b . The second data lines DL 2   a  and DL 2   b  may bypass the hole HL along the hole edge area HEA. 
     The scan lines SL 1  and SL 2  may extend in the second direction D 2  in the display area DA and may be arranged in a first direction D 1  orthogonal to the second direction D 2 . The scan lines SL 1  and SL 2  may include the first scan line SL 1  and the second scan line SL 2 . According to an embodiment, the scan lines SL 1  and SL 2  may bypass the hole HL along the hole edge area HEA. 
     In the hole edge area HEA, at least one of the scan lines SL 1  and SL 2  may overlap the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  on a plane. Alternatively, in the hole edge area HEA, at least one of the scan lines SL 1  and SL 2  may be non-overlapping with the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  on a plane. 
     In the conventional display device, initialization voltage lines do not bypass a hole along a hole edge area. Accordingly, a difference in luminance occurs due to a difference in voltage drop between the hole edge area and a display area excluding the hole edge area. 
     The initialization voltage lines VL 1  and VL 2  may extend in the second direction D 2  in the display area DA and may be alternately arranged with the scan lines SL 1  and SL 2  in the first direction D 1 . The initialization voltage lines VL 1  and VL 2  may include the first initialization voltage line VL 1  and the second initialization voltage line VL 2 . According to an embodiment, the initialization voltage lines VL 1  and VL 2  may bypass the hole HL along the hole edge area HEA. Accordingly, a difference in luminance due to a difference in voltage drop between the display area DA and the hole edge area HEA may be compensated. 
     In the hole edge area HEA, at least one of the initialization voltage lines VL 1  and VL 2  may overlap the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  on a plane. Alternatively, in the hole edge area HEA, at least one of the initialization voltage lines VL 1  and VL 2  may be non-overlapping with the first data lines DLla and DLlb and the second data lines DL 2   a  and DL 2   b  on a plane. 
     According to an embodiment, the (1-1)-th data lines DLla may include a first line LN 1 , a fifth line LN 5 , and a ninth line LN 9  and the (1-2)-th data lines DLlb may include a second line LN 2 , a sixth line LN 6 , and a tenth line LN 10 . In addition, the (2-1)-th data lines DL 2   a  may include a fourth line LN 4 , an eighth line LN 8 , and a twelfth line LN 12 , and the (2-2)-th data lines DL 2   b  may include a third line LN 3 , a seventh line LN 7 , and an eleventh line LN 11 . 
     The second line LN 2  may be located in the second direction D 2  from the first line LN 1 , and the third line LN 3  may be located in the second direction D 2  from the second line LN 2 . The fourth line LN 4  may be located in the second direction D 2  from the third line LN 3  and the fifth line LN 5  may be located in the second direction D 2  from the fourth line LN 4 . The sixth line LN 6  may be located in the second direction D 2  from the fifth line LN 5  and the seventh line LN 7  may be located in the second direction D 2  from the sixth line LN 6 . The eighth lined LN 8  may be located in the second direction D 2  from the seventh line LN 7  and the ninth line LN 9  may be located in the second direction D 2  from the eighth line LN 8 . The tenth line LN 10  may be located in the second direction D 2  from the ninth line LN 9 , the eleventh line LN 11  may be located in the second direction D 2  from the tenth line LN 10 , and the twelfth line LN 12  may be located in the second direction D 2  from the eleventh line LN 11 . That is, in the display area DA, the first to twelfth lines LN 1 , LN 2 , LN 3 , LN 4 , LN 5 , LN 6 , LN 7 , LN 8 , LN 9 , LN 10 , and LN 11  may be sequentially arranged in the second direction D 2 . In other words, in the display area DA, the first to twelfth lines LN 1 , LN 2 , LN 3 , LN 4 , LN 5 , LN 6 , LN 7 , LN 8 , LN 9 , LN 10 , and LN 11  may be repeatedly arranged in the order of the first to twelfth lines LN 1 , LN 2 , LN 3 , LN 4 , LN 5 , LN 6 , LN 7 , LN 8 , LN 9 , LN 10 , and LN 11  along the second direction D 2 . 
     According to an embodiment, in the hole edge area HEA, the first data lines DLla and DL 1   b  may be aggregated with each other, and the second data lines DL 2   a  and DL 2   b  may be aggregated with each other. That is, in the hole edge area HEA, the first data lines DLla and DL 1   b  may be gathered with each other, and the second data lines DL 2   a  and DL 2   b  may be gathered with each other. For example, in the hole edge area HEA, the first line LN 1 , the second line LN 2 , and the fifth line LN 5  may be aggregated with each other. In the hole edge area HEA, the third line LN 3 , the fourth line LN 4 , and the seventh line LN 7  may be aggregated with each other. In the hole edge area HEA, the sixth line LN 6 , the ninth line LN 9 , and the tenth line LN 10  may be aggregated with each other. In the hole edge area HEA, the eighth line LN 8 , the eleventh line LN 11 , and the twelfth line LN 12  may be aggregated with each other. 
     According to an embodiment, at least one of the first data lines DLla and DL 1   b  and at least one of the second data lines DL 2   a  and DL 2   b  may cross in the hole edge area HEA. For example, in a first cross area CA 1 , the fifth line LN 5  among the first data DLla and DL 1   b  may cross the third line LN 3  and the fourth line LN 4  among the second data lines DL 2   a  and DL 2   b . In a second cross area CA 2 , the seventh line LN 7  among the first data lines DLla and DL 1   b  may cross the sixth line LN 6  among the second data lines DL 2   a  and DL 2   b . In addition, in a third cross area CA 3 , the ninth line LN 9  among the first data lines DLla and DL 1   b  may cross the eighth line LN 8  among the second data lines DL 2   a  and DL 2   b . In a fourth cross area CA 4 , the tenth line LN 10  among the first data lines DLla and DL 1   b  may cross the eighth line LN 8  among the second data lines DL 2   a  and DL 2   b.    
     According to an embodiment, in the hole edge area HEA, each of the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  may be disposed on three layers different from each other. For example, in the hole edge area HEA, the first line LN 1 , the second line LN 2 , and the fifth line LN 5  among the first data lines DLla and DLlb may be disposed on three layers different from each other. In the hole edge area HEA, the third line LN 3 , the fourth line LN 4 , and the seventh line LN 7  among the second data lines DL 2   a  and DL 2   b  may be disposed on three layers different from each other. 
     When a distance between the first data lines DLla and DLlb and the second data lines DL 2   a  and DL 2   b  decreases, coupling between the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  may occur. When coupling occurs between the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b , a data signal transmitted by the second data lines DL 2   a  and DL 2   b  may be distorted by a voltage change of a data signal transmitted by the first data lines DLla and DL 1   b  or a data signal transmitted by the first data lines DLla and DL 1   b  may be distorted by a voltage change of a data signal transmitted by the second data lines DL 2   a  and DL 2   b.    
     According to an embodiment, in the hole edge area HEA, the first data lines DLla and DL 1   b  may overlap with each other on a plane, and the second data lines DL 2   a  and DL 2   b  may overlap with each other on a plane. 
     For example, in the hole edge area HEA, the first line LN 1 , the second line LN 2 , and the fifth line LN 5  may overlap with each other on a plane. In the hole edge area HEA, the third line LN 3 , the fourth line LN 4 , and the seventh line LN 7  may overlap with each other on a plane. In the hole edge area HEA, the sixth line LN 6 , the ninth line LN 9 , and the tenth line LN 10  may overlap with each other on a plane. In the hole edge area HEA, the eighth line LN 8 , the eleventh line LN 11  and the twelfth line LN 12  may overlap with each other on a plane. In the hole edge area HEA, as the first data lines DLla and DL 1   b  overlap with each other on a plane and the second data lines DL 2   a  and DL 2   b  overlap with each other on a plane, coupling between the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  may be reduced or substantially prevented. In addition, in the hole edge area HEA, an area occupied by the first data lines DLla and DL 1   b  and the second lines DL 2   a  and DL 2   b  may be reduced. Accordingly, a dead space of the display device  100  may be reduced. 
     In a conventional display device, in a hole edge area, as each of first data lines and second data lines are disposed on two layers different from each other, an area occupied by the first data lines and the second data lines increases. As a result, a dead space of the display device increases. 
     In the display device  100  according to an embodiment, in the hole edge area HEA, as each of the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  are disposed on three layers different from each other, an area occupied by the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  may be reduced. Accordingly, a dead space of the display device  100  may be reduced. 
       FIG. 6  is a cross-sectional view taken along line I-I′ of  FIG. 4 . 
     Referring to  FIGS. 2, 3, 5, and 6 , the first scan lines SL 1 , the first initialization voltage lines VL 1 , the first data lines DLla and DL 1   b , and the second data lines DL 2   a  and DL 2   b  bypassing the hole HL may be disposed in the hole edge area HEA on the substrate  200 . 
     In the hole edge area HEA, each of the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  may be disposed on the same layer as at least one of the metal layer  211 , the source electrode SE, the drain electrode DE, and the connection electrode CE disposed in the display area DA. According to an embodiment, in the hole edge area HEA, the first line LN 1 , the third line LN 3 , the sixth line LN 6 , and the eighth line LN 8  may be disposed on the same layer as the metal layer  211  disposed in the display area DA. In the hole edge area HEA, the second line LN 2 , the fourth line LN 4 , the ninth line LN 9 , and the eleventh lined LN 11  may disposed on the same layer as the source electrode SE and the drain electrode DE disposed in the display area DA. In the hole edge area HEA, the fifth line LN 5 , the seventh line LN 7 , the tenth line LN 10 , and the twelfth line LN 12  may be disposed on the same layer as the connection electrode  230  disposed in the display area DA. That is, in the hole edge area HA, the first line LN 1 , the third line LN 3 , the sixth line LN 6 , and the eighth line LN 8  may be disposed on the substrate  200 , the second line LN 2 , the fourth line LN 4 , the ninth line LN 9 , and the eleventh lined LN 11  may be disposed on the third insulating layer  222 , and the fifth line LN 5 , the seventh line LN 7 , the tenth line LN 10 , and the twelfth line LN 12  may be disposed on the fourth insulating layer  223 . 
     According to an embodiment, in the hole edge area HEA, the first scan lines SL 1  may be disposed on the same layer as the gate electrode GE disposed in the display area DA, and the first initialization voltage lines VL 1  may be disposed on the same layer as the capacitor electrode CE disposed in the display area DA. That is, in the hole edge area HEA, the first scan lines SL 1  may be disposed on the first insulating layer  220 , and the first initialization voltage lines VL 1  may be disposed on the second insulating layer  221 . Similarly, the second scan lines SL 2  may be disposed on the same layer as the first scan lines SL 1 , and the second initialization voltage lines VL 2  may be disposed on the same layer as the first initialization voltage lines VL 1 . 
       FIG. 7  is a plan view illustrating a part of a display device according to an embodiment. 
     Referring to  FIGS. 1 and 7 , the substrate  200  of the display device  100  according to an embodiment may include the display area DA, the peripheral area PA, and the hole edge area HEA. However, the display device  100  described with reference to  FIG. 7  may be substantially the same as or similar to the display device  100  described with reference to  FIG. 2  except for a location of the hole HL. Hereinafter, duplicate descriptions are omitted. 
     According to an embodiment, the hole HL may be formed in an upper portion of the display area DA. For example, the hole HL may be formed in a central upper portion of the display area DA. 
     According to an embodiment, the scan lines SL 1  and SL 2  and the initialization voltage lines VL 1  and VL 2  may not be disposed in the hole edge area HEA on the substrate  200 . That is, the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  are disposed in the hole edge area HEA on the substrate  200 , but the scan lines SL 1  and SL 2  and the initialization voltage lines VL 1  and VL 2  may not be disposed in the hole edge area HEA on the substrate  200 . In other words, the scan lines SL 1  and SL 2  and the initialization voltage lines VL 1  and VL 2  may not bypass the hole HL along the hole edge area HEA. 
     Hereinafter, the display device  100  according to an embodiment will be described with reference to  FIGS. 8 and 9 . In the display device  100  according to a embodiment described with reference to  FIGS. 8 and 9 , descriptions of components that area substantially the same as or similar to the display device  100  according to an embodiment described with reference to  FIGS. 4, 5, and 6  will be emitted. 
       FIG. 8  is a plan view illustrating an enlarged view of area “C” of  FIG. 7 . For example,  FIG. 8  illustrates the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  of the display device  100  of  FIG. 7 . 
     Referring to  FIGS. 1, 7, and 8 , the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  may be disposed in the display area DA and the hole edge area HEA on the substrate  200 . 
     The first data lines DLla and DL 1   b  may extend in the first direction D 1  in the display area DA and may be arranged in the second direction D 2  orthogonal to the first direction D 1 . The first data lines DL 1   a  and DL 2   b  may bypass the hole HL along the hole edge area HEA. 
     The second data lines DL 2   a  and DL 2   b  may extend in the first direction D 1  in the display area D 1  and may be arranged adjacent to the first data lines DLla and DL 1   b . The second data lines DL 2   a  and DL 2   b  may bypass the hole HL along the hole edge area HEA. 
     According to an embodiment, the (1-1)-th data lines DLla may include a first line LN 1  and a fifth line LN 5 . The (1-2)-th data lines DL 1   b  may include a second line LN 6  and a sixth line LN 6 . In addition, the (2-1)-th data lines DL 2   a  may include a fourth line LN 4  and an eighth line LN 8 . The (2-2)-th data lines DL 2   b  may include a third line LN 3  and a seventh line LN 7 . 
     The second line LN 2  may be located in the second direction D 2  from the first line LN 1  and the third line LN 3  may be located in the second direction D 2  from the second line LN 2 . The fourth line LN 4  may be located in the second direction D 2  from the third line LN 3  and the fifth line LN 5  may be located in the second direction D 2  from the fourth line LN 4 . The sixth line LN 6  may be located in the second direction D 2  from the fifth line LN 5 , the seventh line LN 7  may be located in the second direction D 2  from the sixth line LN 6 , and the eighth line LN 8  may be located in the second direction D 2  from the seventh line LN 7 . That is, in the display area DA, the first to eighth lines LN 1 , LN 2 , LN 3 , LN 4 , LN 5 , LN 6 , LN 7 , and LN 8  may be sequentially arranged in the second direction D 2 . In other words, in the display area DA, the first to eighth lines LN 1 , LN 2 , LN 3 , LN 4 , LN 5 , LN 6 , LN 7 , and LN 8  may be repeatedly arranged in the order of the first to eighth lines LN 1 , LN 2 , LN 3 , LN 4 , LN 5 , LN 6 , LN 7 , and LN 8  along the second direction D 2 . 
     According to an embodiment, at least one of the first data lines DLla and DL 1   b  and at least one of the second data lines DL 2   a  and DL 2   b  may cross in the hole edge area HEA. For example, in a fourth cross area CA 4 , the fifth line LN 5  of the first data lines DLla and DL 1   b  may cross the third line LN 3  of the second data lines DL 2   a  and DL 2   b . In a fifth cross area CA 5 , the sixth line LN 6  of the first data lines DLla and DL 1   b  may cross the third line LN 3  of the second data lines DL 2   a  and DL 2   b.    
     According to an embodiment, in the hole edge area HEA, each of the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  may be disposed on four layers different from each other. For example, in the hole edge area HEA, the first line LN 1 , the second line LN 2 , the fifth line LN 5 , and the sixth line LN 6  among the first data lines DL 1   a  and DL 1   b  may be disposed on four layers different from each other and the third line LN 3 , the fourth line LN 4 , the seventh line LN 7 , and the eighth line LN 8  among the second data lines DL 2   a  and DL 2   b  may be disposed on four layers different from each other. That is, each of the scan lines SL 1  and SL 2  and the initialization voltage lines VL 1  and VL 2  disposed in the hole edge area HEA on the substrate  200  may be used as the second line LN 2  and the fourth line LN 4 . In the hole edge area HEA, as each of the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  may disposed on four layers different from each other, an area occupied by the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  may be further reduced in the hole edge area HEA. Accordingly, a dead space of the display device  100  may be further reduced. 
     According to an embodiment, in the hole edge area HEA, the first data lines DLla and DL 1   b  may overlap with each other on a plane, and the second data lines DL 2   a  and DL 2   b  may overlap with each other on a plane. For example, in the hole edge area HEA, the first line LN 1 , the second line LN 2 , the fifth line LN 5 , and the sixth line LN 6  may overlap with each other on a plane and the third line LN 3 , the fourth line LN 4 , the seventh line LN 7 , and the eighth line LN 8  may overlap with each other on a plane. 
     In the hole edge area HEA, as the first data lines DLla and DL 1   b  overlap with each other on a plane and the second data lines DL 2   a  and DL 2   b  overlap with each other on a plane, coupling between the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  may be reduced or substantially prevented. In addition, an area occupied by the first data lines DLla and DL 1   b  the second data lines DL 2   a  and DL 2   b  in the hole edge area HEA may be reduced. Accordingly, a dead space of the display device  100  may be reduced. 
       FIG. 9  is a cross-sectional view taken along line II-II′ of  FIG. 8 . 
     Referring to  FIGS. 3, 7, 8, and 9 , the first data lines DLla and DL 1   b  and the second data lines DL 2   a  bypassing the hole HL may be disposed in the hole edge area HEA on the substrate  200 . 
     In the hole edge area HEA, each of the first data lines DLla and DL 1   b  and the second data lines DL 2   a  and DL 2   b  may be disposed on the same layer as at least one of the metal layer  211 , the gate electrode GE, the source electrode SE, the drain electrode DE, and the connection electrode CE disposed in the display area DA. 
     According to an embodiment, in the hole edge area HEA, the first line LN 1  and the third line LN 3  may be disposed on the same layer as the metal layer  211  disposed in the display area DA. In the hole edge area HEA, the second line LN 2  and the fourth line LN 4  may be disposed on the same layer as the gate electrode GE disposed in the display area DA. In the hole edge area HEA, the fifth line LN 5  and the seventh line LN 7  may be disposed on the same layer as the source electrode SE and the drain electrode DE disposed in the display area DA. In the hole edge area HEA, the sixth line LN 6  and the eighth line LN 8  may be disposed on the same layer as the connection electrode  230  disposed in the display area DA. That is, in the hole edge area HEA, the first line LN 1  and the third line LN 3  may be disposed on the substrate  200 , the second line LN 2  and the fourth line LN 4  may be disposed on the first insulating layer  220 , the fifth line LN 5  and the seventh line LN 7  may be disposed on the third insulating layer  222 , and the sixth line LN 6  and the eighth line LN 8  may be disposed on the fourth insulating layer  223 . 
       FIG. 10  is a plan view illustrating a part of a display device according to an embodiment. 
     Referring to  FIG. 10 , the substrate  200  of the display device  101  according to an embodiment may include the display area DA, the peripheral area PA, and the hole edge area HEA. However, the display device  101  described with reference to  FIG. 10  may be substantially the same as, or similar to, the display device  100  described with reference to  FIG. 2  except for the shape of the hole HL. Hereinafter, duplicate descriptions are omitted. 
     According to an embodiment, the hole HL may have a rectangular shape with rounded corners on a plane, and the hole edge area HEA may have a rectangular ring shape with rounded corners on a plane. 
       FIG. 11  is a cross-sectional view illustrating an electronic device according to an embodiment. 
     Referring to  FIG. 11 , an electronic device  1000  according to an embodiment may include the display device  100  and a functional module  300 . The display device  100  may include the display area DA, the peripheral area PA, and the hole edge area HEA. The display device  100  of  FIG. 11  may be substantially the same as the display device  100  described with reference to  FIGS. 1, 2, 3, 4, 5, 6, 7, 8, and 9 . Alternatively, the display device  100  of  FIG. 11  may be substantially the same as the display device  101  described with reference to  FIG. 10 . 
     The functional module  300  may be disposed under the display device  100 . The functional module  300  may be disposed under the display device  100  to overlap the hole HL. 
     According to an embodiment, the functional module  300  may include a camera module for capturing (or recognizing) an image of an object located in front of the display device  100 ; a face recognition sensor module for detecting a face of user; a pupil recognition sensor module for detecting a pupil of the user; an acceleration sensor module and a geomagnetic sensor module for determining a movement of the display device; a proximity sensor module and an infrared sensor module for detecting proximity with respect to the front surface of the display device; and an illuminance sensor module for measuring a degree of brightness from the outside. 
     The display device according to embodiments of the present invention may be applied to a display device included in a computer, a notebook computer, a mobile phone, a smart phone, a smart pad, a PMP, a PDA, an MP3 player, and the like. 
     Although certain embodiments and implementations have been described herein, other embodiments and modifications will be apparent from this description. Accordingly, the inventive concepts are not limited to such embodiments, but rather to the broader scope of the appended claims and various obvious modifications and equivalent arrangements as would be apparent to a person of ordinary skill in the art.