Patent Publication Number: US-2021175299-A1

Title: Display device, mask assembly, and apparatus for manufacturing display device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to and the benefit of each of Korean Patent Application Nos. 10-2019-0163773, filed on Dec. 10, 2019, and 10-2020-0148894, filed on Nov. 9, 2020, the entire contents of both which are hereby incorporated by reference. 
     BACKGROUND 
     1. Field 
     One or more embodiments of the present disclosure relate to a display device, and more particularly, to a display device, a mask assembly, and an apparatus for manufacturing the display device. 
     2. Description of Related Art 
     Mobile electronic devices have a wide range of uses. Tablet personal computers (PCs) have been recently used as mobile electronic devices, in addition to small electronic devices such as mobile phones. 
     A mobile electronic device includes a display device for providing visual information such as images and/or moving images to users in order to support and/or provide various suitable functions. As components for driving a display device have recently become smaller, a portion occupied by a display device in an electronic device has increased in size, and display devices including a structure that may be bent (e.g., may be bendable) to have a certain angle different from a flat state has been developed. 
     SUMMARY 
     When the existing display device (e.g., a display device of the related art) is arranged in a vehicle or the like, glare may occur due to external light reflection and/or the like in the display device. In addition, in the existing mask assembly (e.g., a mask assembly of the related art) and an apparatus for manufacturing the existing display device, a deposition material is deposited on a substrate differently from a designed pattern because deformation of a mask sheet is out of an expected range when the mask sheet is under tension according to a pattern of an opening portion. As such, one or more aspects of one or more embodiments of the present disclosure are directed towards a display device having a precise pattern while reducing external light reflection, a mask assembly for manufacturing the display device, and an apparatus for manufacturing the display device. However, these aspects are merely examples and the scope of the present disclosure is not limited thereto. 
     Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments of the disclosure. 
     According to one or more embodiments, a display device includes a first sub-pixel having a quadrangular shape, a second sub-pixel arranged to face a first side and a second side of the first sub-pixel, the second sub-pixel having a quadrangular shape, and a third sub-pixel arranged to face a side of the first sub-pixel and spaced apart from the second sub-pixel, a third sub-pixel arranged to face a side of the first sub-pixel and spaced apart from the second sub-pixel, the third sub-pixel having a quadrangular shape, wherein a distance from one side (e.g., the first side) of the first sub-pixel to the second sub-pixel and a distance from one side (e.g., the first side) of the first sub-pixel to the third sub-pixel are different from each other. 
     At least a portion of the second sub-pixel and at least a portion of the third sub-pixel may be arranged within a length range of one of the first side and the second side. 
     A short side of the second sub-pixel may be parallel to the first side or the second side. 
     A short side of the third sub-pixel may be parallel to the first side or the second side. 
     A plurality of first sub-pixels, comprising the first sub-pixel, may be provided, and centers of a first set of the plurality of first sub-pixels may be arranged with each other on a straight line in a first direction and centers of a second set of the plurality of first sub-pixels may be arranged with each other in a serpentine shape in a second direction. 
     Each of the plurality of first sub-pixels may emit green light. 
     The first direction may be a direction parallel to a long side of the display device. 
     A plurality of second sub-pixels, comprising the second sub-pixel, may be provided and a plurality of third sub-pixels, comprising the third sub-pixel, may be provided, wherein centers of some of the plurality of second sub-pixels and/or some of the plurality of third sub-pixels may be arranged with each other on a straight line in one direction. 
     A plurality of second sub-pixels, comprising the second sub-pixel, may be provided and a plurality of third sub-pixels, comprising the third sub-pixel, may be provided, wherein centers of some of the plurality of second sub-pixels and/or some of the plurality of third sub-pixels may be arranged with each other in a serpentine shape in one direction. 
     A plurality of first sub-pixels, comprising the first sub-pixel, may be provided and may be arranged with each other in a first direction, wherein the second sub-pixel facing the first side and the second sub-pixel or the third sub-pixel facing the second side may be arranged to be symmetrical to each other with respect to a straight line connecting centers of the plurality of first sub-pixels arranged with each other in the first direction. 
     A length of a long side of the second sub-pixel and a length of a long side of the third sub-pixel may be equal to each other. 
     The display device may further include a spacer arranged between the first sub-pixel and the second sub-pixel and/or between the first sub-pixel and the third sub-pixel. 
     A shortest distance from the second sub-pixel to the spacer may be different from a shortest distance from the third sub-pixel to the spacer. 
     A short side of the second sub-pixel and/or a short side of the third sub-pixel may overlap an extension line of one side of the first sub-pixel and may be arranged on a straight line extending from one side of the first sub-pixel. 
     A plurality of first sub-pixels, comprising the first sub-pixel, may be provided and may be arranged with each other in a first direction, wherein a long side of the second sub-pixel or a long side of the third sub-pixel may form an angle of 45 degrees with respect to a straight line connecting centers of the plurality of first sub-pixels arranged with each other in the first direction. 
     An area of the first sub-pixel may be greater than at least one selected from an area of the second sub-pixel and an area of the third sub-pixel. 
     An area of the second sub-pixel and an area of the third sub-pixel may be different from each other. 
     An outline connecting a portion of an edge of the second sub-pixel to a portion of an edge of the third sub-pixel may be square. 
     A vertex of at least one selected from the first sub-pixel, the second sub-pixel, and the third sub-pixel may be chamfered. 
     The first sub-pixel may emit blue color light, one selected from the second sub-pixel and the third sub-pixel may emit red color light, and the other one selected from the second sub-pixel and the third sub-pixel may emit green color light. 
     According to one or more embodiments, a display device includes a plurality of first intermediate layers having quadrangular shapes and spaced apart from each other, a plurality of second intermediate layers having quadrangular shapes and spaced apart from each other, the plurality of second intermediate layers facing the plurality of first intermediate layers, respectively, and a plurality of third intermediate layers having quadrangular shapes and spaced apart from each other, the plurality of third intermediate layers facing the plurality of first intermediate layers, respectively, and being spaced apart from the plurality of second intermediate layers, wherein a distance from a side of each of the first intermediate layers to a respective one of the second intermediate layers and a distance from a side of each of the first intermediate layers to a respective one of the third intermediate layers are different from each other. 
     Each of the first intermediate layers, a respective one of the second intermediate layers, and a respective one of the third intermediate layers may include (e.g., be) materials that are to emit light of different colors when power is applied thereto. 
     Each of the second intermediate layers and a respective one of the third intermediate layers may be arranged in parallel with each other. 
     Centers of some of the plurality of second intermediate layers and centers of some of the plurality of third intermediate layers may be arranged with each other on a straight line. 
     A length of a long side of each of the second intermediate layers and a length of a long side of a respective one of the third intermediate layers may be equal to each other. 
     The display device may further include a spacer arranged between each of the first intermediate layers and a respective one of the second intermediate layers and/or between each of the first intermediate layers and a respective one of the third intermediate layers. 
     Shortest distances between second intermediate layers, which face a same first intermediate layer of the first intermediate layers from among the plurality of second intermediate layers, and the same first intermediate layer, or shortest distances between third intermediate layers, which face a same first intermediate layer of the first intermediate layers from among the plurality of third intermediate layers, and the same first intermediate layer may be different from each other. 
     According to one or more embodiments, a mask assembly includes a mask frame, and a plurality of mask sheets arranged on the mask frame under tension and sequentially arranged with each other along a side of the mask frame, wherein each of the plurality of mask sheets has a plurality of openings, wherein some of the plurality of openings are tilted in one direction with respect to a tensile direction of the mask sheet, the other ones of the plurality of openings are tilted in a different direction from the some of the plurality of openings, and centers of at least three of the plurality of openings are arranged in a serpentine shape in one direction. 
     Each of the plurality of openings may be arranged at an angle of 45 degrees with respect to the tensile direction of the mask sheet. 
     Centers of openings arranged with each other in the tensile direction of the mask sheet or in a direction normal to the tensile direction of the mask sheet from among the plurality of openings may be arranged in a line. 
     Centers of openings arranged with each other in the tensile direction of the mask sheet or in a direction normal to the tensile direction of the mask sheet from among the plurality of openings may be arranged in a serpentine shape. 
     Each of the plurality of openings may be square or rectangular. 
     A vertex of each of the plurality of openings may be chamfered. 
     According to one or more embodiments, an apparatus for manufacturing a display device includes a chamber in which a display substrate is arranged, a deposition source arranged in the chamber to supply a deposition material into the chamber, and a mask assembly arranged to face the deposition source to pass the deposition material to the display substrate in a pattern form, wherein the mask assembly includes: a mask frame, and a plurality of mask sheets arranged on the mask frame under tension and sequentially arranged with each other along a side of the mask frame, wherein each of the plurality of mask sheets has a plurality of openings, wherein some of the plurality of openings are tilted in one direction with respect to a tensile direction of the mask sheet, the other ones of the plurality of openings are tilted in a different direction from the some of the plurality of openings, and centers of at least three of the plurality of openings are arranged in a serpentine shape along one direction. 
     Each of the plurality of openings may be arranged at an angle of 45 degrees with respect to the tensile direction. 
     Centers of openings arranged with each other in the tensile direction of the mask sheet or in a direction normal to the tensile direction of the mask sheet from among the plurality of openings may be arranged with each other in a line. 
     Centers of openings arranged with each other in the tensile direction of the mask sheet or in a direction normal to the tensile direction of the mask sheet from among the plurality of openings may be arranged in a serpentine shape. 
     Each of the plurality of openings may be square or rectangular. 
     A vertex of each of the plurality of openings may be chamfered. 
     According to one or more embodiments, a display device includes a first sub-pixel, a second sub-pixel arranged to face the first sub-pixel, a third sub-pixel arranged to face the first sub-pixel and spaced apart from the second sub-pixel, and a spacer arranged between the first sub-pixel and the second sub-pixel and/or between the first sub-pixel and the third sub-pixel, wherein a distance from one side of the first sub-pixel facing the second sub-pixel and the third sub-pixel to the second sub-pixel is different from a distance from one side of the first sub-pixel to the third sub-pixel. 
     An area of the second sub-pixel may be equal to an area of the third sub-pixel. 
     An area of the second sub-pixel may be different from an area of the third sub-pixel. 
     The second sub-pixel and the third sub-pixel may be each rectangular, wherein a length of a long side of the second sub-pixel and a length of a long side of the third sub-pixel may be equal to each other. 
     A shortest distance from an edge of the spacer to the second sub-pixel and a shortest distance from the edge of the spacer to the third sub-pixel may be equal to each other. 
     A shortest distance between one at least one selected from the second sub-pixel and the third sub-pixel and an edge of the spacer may be equal to a shortest distance between the first sub-pixel and an edge of the spacer. 
     The second sub-pixel and the third sub-pixel may each be rectangular, wherein a distance between long sides of the first sub-pixel and the second sub-pixel facing each other, a distance between a long side of the second sub-pixel and a long side of the third sub-pixel facing each other, and a distance between a long side of the third sub-pixel and a long side of another first sub-pixel facing each other may all be equal to one another. 
     According to one or more embodiments, a display device includes a first sub-pixel, a second sub-pixel arranged to face one side of the first sub-pixel, and a third sub-pixel arranged to face one side of the first sub-pixel and spaced apart from the second sub-pixel, wherein one side of at least one selected from the first sub-pixel, the second sub-pixel, and the third sub-pixel is convex or concave, and the second sub-pixel and the third sub-pixel are adjacent to each other and are arranged to face the same side of the first sub-pixel. 
     One side of the second sub-pixel and one side of the third sub-pixel, which face each other, may be straight. 
     At least one selected from one side of the second sub-pixel and one side of the third sub-pixel, which face each other, may protrude from a respective center of at least one selected from the second sub-pixel and the third sub-pixel. 
     A plurality of first sub-pixels, comprising the first sub-pixel, may be provided, and wherein a tangent line to a point on one convex or concave side of the first sub-pixel may intersect or cross a branch line at an angle ranging from about 20 degrees to about 70 degrees, the branch line passing through or being parallel to a line passing through centers of first sub-pixels arranged with each other in a first direction from among the plurality of first sub-pixels. 
     At least one selected from a distance between one side of the first sub-pixel and one side of the second sub-pixel facing each other, a distance between one side of the second sub-pixel and one side of the third sub-pixel facing each other, and a distance between one side of the first sub-pixel and one side of the third sub-pixel facing each other may be constant along a length direction of each side. 
     One selected from one side of the first sub-pixel, one side of the second sub-pixel, and one side of the third sub-pixel may be convex, and another one selected from the one side of the first sub-pixel, the one side of the second sub-pixel, and the one side of the third sub-pixel, the other one side facing the one selected from the one side of the first sub-pixel, the one side of the second sub-pixel, and the one side of the third sub-pixel may be concave. 
     At least one selected from the second sub-pixel and the third sub-pixel may have a long side and a short side, and the long side may be convex or concave. 
     A corner of at least one selected from the first sub-pixel, the second sub-pixel, and the third sub-pixel may be chamfered. 
     A planar area of one selected from the first sub-pixel, the second sub-pixel, and the third sub-pixel may be different from a planar area of another one selected from the first sub-pixel, the second sub-pixel, and the third sub-pixel. 
     One side of at least one selected from the first sub-pixel, the second sub-pixel, and the third sub-pixel may be curved. 
     At least one selected from the first sub-pixel, the second sub-pixel, and the third sub-pixel may be arranged to be tilted in one direction. 
     The above and other aspects and features of certain embodiments of the disclosure will be more apparent from the following description, the accompanying drawings, and claims. 
     This general and specific aspects may be implemented by a system, a method, a computer program, or a certain combination of a system, a method, and a computer program. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects and features of certain embodiments of the disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1A  is a perspective view illustrating a case where a display device according to an embodiment is arranged in a vehicle; 
         FIG. 1B  is a plan view of a display device according to an embodiment; 
         FIG. 2  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of the display device shown in  FIG. 1B ; 
         FIG. 3  is a cross-sectional view of the display device taken along line A-A′ of  FIG. 2 ; 
         FIG. 4  is a front view of an apparatus for manufacturing the display device shown in  FIG. 1B ; 
         FIG. 5  is a cross-sectional view of a first deposition unit shown in  FIG. 4 ; 
         FIG. 6  is a perspective view of a first mask assembly shown in  FIG. 5 ; 
         FIG. 7  is a plan view of a portion of a first mask sheet shown in  FIG. 6 ; 
         FIG. 8  is a plan view of a portion of a second mask sheet utilized in a second deposition unit shown in  FIG. 4 ; 
         FIG. 9  is a plan view of a portion of a third mask sheet utilized in a third deposition unit shown in  FIG. 4 ; 
         FIG. 10  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 11  is a plan view of a portion of a second mask sheet for depositing a second intermediate layer shown in  FIG. 10 ; 
         FIG. 12  is a plan view of a portion of a third mask sheet for depositing a third intermediate layer shown in  FIG. 10 ; 
         FIG. 13  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 14  is a plan view of a portion of a first mask sheet for depositing a first intermediate layer shown in  FIG. 13 ; 
         FIG. 15  is a plan view of a portion of a second mask sheet for depositing a second intermediate layer shown in  FIG. 13 ; 
         FIG. 16  is a plan view of a portion of a third mask sheet for depositing a third intermediate layer shown in  FIG. 13 ; 
         FIG. 17  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 18  is a plan view of a portion of a second mask sheet for depositing a second intermediate layer shown in  FIG. 17 ; 
         FIG. 19  is a plan view of a portion of a third mask sheet for depositing a third intermediate layer shown in  FIG. 17 ; 
         FIG. 20  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 21  is a plan view of a portion of a first mask sheet for depositing a first intermediate layer shown in  FIG. 20 ; 
         FIG. 22  is a plan view of a portion of a second mask sheet for depositing a second intermediate layer shown in  FIG. 20 ; 
         FIG. 23  is a plan view of a portion of a third mask sheet for depositing a third intermediate layer shown in  FIG. 20 ; 
         FIG. 24A  is a plan view of the first sub-pixel of  FIG. 20 ; 
         FIG. 24B  is a plan view of the third sub-pixel of  FIG. 20 ; 
         FIG. 24C  is a plan view of the second sub-pixel of  FIG. 20 ; 
         FIG. 24D  is a plan view illustrating a relationship among a first sub-pixel, an opening of a pixel-defining layer, and a first intermediate layer shown in  FIG. 24A ; 
         FIG. 25  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 26A  is a plan view of the second sub-pixel shown in  FIG. 25 ; 
         FIG. 26B  is a plan view of the third sub-pixel shown in  FIG. 25 ; 
         FIG. 27  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 28  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 29  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 30  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 31  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 32  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 33  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 34  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 35  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 36  is a plan view of a portion of a first mask sheet for depositing a first intermediate layer of the first sub-pixel shown in  FIG. 35 ; 
         FIG. 37  is a plan view of a portion of a second mask sheet for depositing a second intermediate layer of the second sub-pixel shown in  FIG. 35 ; 
         FIG. 38  is a plan view of a portion of a third mask sheet for depositing a third intermediate layer of the third sub-pixel shown in  FIG. 35 ; 
         FIG. 39  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 40  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; 
         FIG. 41  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment; and 
         FIG. 42  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in more detail to some embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the present embodiments may have different suitable forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the drawings, to explain aspects and features of the present description. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Throughout the disclosure, the expression “at least one of a, b or c” indicates only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof. As used herein, the use of the term “may,” when describing embodiments of the present disclosure, refers to “one or more embodiments of the present disclosure.” 
     As the present description allows for various suitable changes and numerous embodiments, certain embodiments will be illustrated in the drawings and described in the written description. Aspects and features of one or more embodiments and methods of accomplishing the same will become more apparent from the following detailed description of the one or more embodiments, taken in conjunction with the accompanying drawings. However, the present embodiments may have different suitable forms and the present disclosure should not be construed as being limited to the descriptions set forth herein. 
     Hereinafter, the present embodiments are described in more detail with reference to the accompanying drawings. In the drawings, the same reference numerals are given to the same or corresponding elements, and a repeated description thereof may not be provided. 
     It will be understood that although terms such as “first” and “second” may be used herein to describe various components, these components should not be limited by these terms, and these terms are only used to distinguish one component from another component. 
     Also, 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. 
     Also, it will be understood that the terms “comprise,” “include,” and “have” used herein specify the presence of stated features and/or components, but do not preclude the presence or addition of one or more other features and/or components. 
     Also, it will be understood that when a layer, region, or component is referred to as being “on” another layer, region, or component, it may be “directly” or “indirectly” on the other layer, region, or component. For example, one or more intervening layers, regions, or components may be located therebetween. 
     Sizes of components in the drawings may be exaggerated for convenience of description. For example, because the sizes and thicknesses of components in the drawings may be exaggerated for convenience of description, the present disclosure is not limited thereto. As used herein, and except as otherwise defined, the term “substantially,” “about,” “approximately,” and similar terms are used as terms of approximation and not as terms of degree, and are intended to account for the inherent deviations in measured or calculated values that would be recognized by those of ordinary skill in the art. 
     The X-axis, the Y-axis, and the Z-axis are not limited to three axes of a rectangular coordinate system and may be interpreted in a broader sense. For example, the X-axis, the Y-axis, and the Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. 
     When a certain embodiment may be implemented differently, a disclosed process order may be performed differently from the described order. For example, two consecutively described processes (e.g., two processes described as being consecutively performed) may be performed substantially at the same time or performed in an order opposite to the described order. 
       FIG. 1A  is a perspective view illustrating a case where a display device according to an embodiment is arranged in a vehicle.  FIG. 1B  is a plan view of a display device according to an embodiment.  FIG. 2  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of the display device shown in  FIG. 1B .  FIG. 3  is a cross-sectional view of the display device taken along line A-A′ of  FIG. 2 . 
     Referring to  FIGS. 1A to 3 , a display device  20  may include a display area DA and a non-display area NDA defined on a substrate  21 , the non-display area NDA being around (e.g., partially or entirely surrounding) the display area DA. A light-emitting portion may be arranged in the display area DA, and a power line and the like may be arranged in the non-display area NDA. Furthermore, a pad portion C may be arranged in the non-display area NDA. 
     The display area DA may have various suitable shapes. For example, the display area DA may have a shape such as a rectangle, a square, a polygon, or a circle. However, the display area DA may have any suitable shape, such as, for example, an irregular shape other than a rectangle, a square, a polygon, a circle, and the like. However, for convenience of description, a case where the display area DA has a rectangular shape will be described in more detail later below. 
     The display device  20  may be arranged inside a vehicle, an airplane, or the like. In this case, the display device  20  may display various suitable types (e.g., kinds) of images, characters, and/or the like. Hereinafter, for convenience of description, a case where the display device  20  is arranged inside a vehicle will be described in more detail. 
     In general, the display device  20  may be arranged at an angle to an interior material of a vehicle. In this case, the display device  20  may have various suitable shapes. For example, the display device  20  may have a round outer surface. As another embodiment, the display device  20  may have a circular or polygonal shape. Hereinafter, for convenience of description, a case in which the display device  20  has a rectangular shape will be described in more detail. 
     The display device  20  as described above may have a rectangular or square shape. In this case, the display device  20  may have a short side and a long side. The long side of the display device  20  or the short side of the display device  20  may be arranged to be adjacent to a window WD of the vehicle. 
     The display device  20  may include a display substrate D and a thin-film encapsulation layer E. The display substrate D may include the substrate  21 , a thin-film transistor (TFT), a passivation film  27 , and a pixel electrode  28 - 1 . In another embodiment, the display substrate D may include some of the substrate  21 , the thin-film transistor TFT, the passivation film  27 , the pixel electrode  28 - 1 , and an intermediate layer  28 - 2 . 
     The substrate  21  may include (e.g., be) a plastic material, and/or a metal material such as stainless steel (SUS) and/or titanium. The substrate  21  may include (e.g., be) a high molecular resin, such as polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, and/or cellulose acetate propionate. The substrate  21  may have a single layer or multilayer structure including (e.g., being) the material (e.g., one or more of the above-describe materials). In the case of the multilayer structure, the substrate  21  may further include an inorganic layer. For convenience of description, a case where the substrate  21  includes (e.g., is) polyimide will be mainly described in more detail later below. 
     The thin-film transistor TFT may be formed on the substrate  21 , the passivation film  27  may be formed to cover the thin-film transistor TFT, and an organic light-emitting device  28  may be formed on the passivation film  27 . 
     A buffer layer  22  may be further formed on a top surface of the substrate  21 , the buffer layer  22  including (e.g., being) an organic compound and/or an inorganic compound (e.g., SiOx (SiO x ) (x≥1) and/or SiNx (SiN x ) (x≥1)). 
     After an active layer  23  is formed on the buffer layer  22  in a certain pattern, the active layer  23  may be covered by a gate insulating layer  24 . The active layer  23  includes a source region  23 - 1  and a drain region  23 - 3 , and further includes a channel region  23 - 2  therebetween. 
     The active layer  23  may include (e.g., be) various suitable materials. For example, the active layer  23  may include (e.g., be) an inorganic semiconductor material such as amorphous silicon and/or crystalline silicon. As another example, the active layer  23  may include (e.g., be) an oxide semiconductor. As another example, the active layer  23  may include (e.g., be) an organic semiconductor material. However, for convenience of description, a case where the active layer  23  includes (e.g., is) amorphous silicon will be described in more detail later below. 
     The active layer  23  may be formed by forming an amorphous silicon film on the buffer layer  22 , crystallizing the amorphous silicon film into a polycrystalline silicon film, and patterning the polycrystalline silicon film. The source region  23 - 1  and the drain region  23 - 3  of the active layer  23  may be doped with impurities according to a type (e.g., kind) of the thin-film transistor TFT, such as a driving thin-film transistor or a switching thin-film transistor. 
     A gate electrode  25  that corresponds to the active layer  23  (e.g., overlaps the active layer  23 , for example, the channel region  23 - 2  of the active layer  23 ) and an interlayer insulating layer  26  that covers the gate electrode  25  may be formed on a top surface of the gate insulating layer  24 . 
     After a contact hole H 1  is formed in the interlayer insulating layer  26  and the gate insulating layer  24 , a source electrode  27 - 1  and a drain electrode  27 - 2  may be formed on the interlayer insulating layer  26  to respectively contact the source region  23 - 1  and the drain region  23 - 3 . In some embodiments, the source electrode  27 - 1  and the drain electrode  27 - 2  may respectively contact the source region  23 - 1  and the drain region  23 - 3  through respective contact holes in the interlayer insulating layer  26  and the gate insulating layer  24 . 
     The passivation film  27  may be formed on the thin-film transistor TFT, and a pixel electrode  28 - 1  of the organic light-emitting device  28  may be formed on the passivation film  27 . The pixel electrode  28 - 1  may contact the drain electrode  27 - 2  of the thin-film transistor TFT through a via hole H 2  formed in the passivation film  27 . The passivation film  27  may include (e.g., be) an inorganic material and/or an organic material and have a single-layer structure or a multi-layer structure. The passivation film  27  may be formed as a planarization film having a flat top surface regardless of a curved shape of a lower film below the passivation film  27  or may be curved along the curved shape of the lower film. The passivation film  27  may include (e.g., be) a transparent insulator to achieve a resonance effect. 
     After the pixel electrode  28 - 1  is formed on the passivation film  27 , a pixel-defining layer  29  may be formed of an organic material and/or an inorganic material to cover the pixel electrode  28 - 1  and the passivation film  27 , and the pixel-defining layer  29  may be opened to expose the pixel electrode  28 - 1  to the outside through an opening OP of the pixel-defining layer  29 . For example, the pixel-defining layer  29  may cover a portion (e.g., an edge) of the pixel electrode  28 - 1  and the opening OP may expose another portion (e.g., a center portion) of the pixel electrode  28 - 1 . 
     The intermediate layer  28 - 2  and an opposite electrode  28 - 3  may be formed on at least the pixel electrode  28 - 1 . In some embodiments, the opposite electrode  28 - 3  may be formed on the entire surface of the display substrate D. For example, the opposite electrode  28 - 3  may be a common electrode. The opposite electrode  28 - 3  may be formed on the intermediate layer  28 - 2  and the pixel-defining layer  29 . Hereinafter, for convenience of description, a case where the opposite electrode  28 - 3  is formed on the intermediate layer  28 - 2  and the pixel-defining layer  29  will be mainly described in more detail. 
     The pixel electrode  28 - 1  may function as an anode, and the opposite electrode  28 - 3  may function as a cathode. Polarities of the pixel electrode  28 - 1  and the opposite electrode  28 - 3  may be switched. 
     The pixel electrode  28 - 1  and the opposite electrode  28 - 3  may be insulated from each other by the intermediate layer  28 - 2 , and voltages of different polarities may be applied to the intermediate layer  28 - 2  such that an organic emission layer emits light. 
     The intermediate layer  28 - 2  may include an organic emission layer. In some embodiments, the intermediate layer  28 - 2  may include an organic emission layer and may further include at least one selected from a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL), which, together with the organic emission layer, may be arranged with each other in any suitable stacking sequence. However, the present disclosure is not limited thereto. For example, the intermediate layer  28 - 2  may include an organic emission layer and may further include various suitable functional layers. 
     A plurality of intermediate layers  28 - 2  may be provided, and the plurality of intermediate layers  28 - 2  may form the display area DA. The plurality of intermediate layers  28 - 2  may be arranged to be spaced apart from each other in the display area DA. 
     One unit pixel may include a plurality of sub-pixels. The plurality of sub-pixels may emit light of various suitable colors. In an embodiment, one sub-pixel may be defined as a region in which light having one color is emitted. In another embodiment, one sub-pixel may be defined as a portion of the pixel electrode  28 - 1  that is exposed to the outside through an opened area of the pixel-defining layer  29 . In this case, adjusting the size of one sub-pixel may be achieved by adjusting the area of the portion of the pixel electrode  28 - 1  that is exposed to the outside by adjusting the size of the opened area of the pixel-defining layer  29 . Hereinafter, for convenience of description, a case where one sub-pixel is a region in which light having one color is emitted will be mainly described in more detail. 
     The plurality of sub-pixels may include sub-pixels to emit red, green, and blue light, respectively. In another embodiment, the plurality of sub-pixels may include sub-pixels to emit red, green, blue, and white light, respectively. In another embodiment, the plurality of sub-pixels may include sub-pixels to emit red, yellow, and blue light, respectively. The plurality of sub-pixels are not limited to those described above, and may include all suitable cases including sub-pixels to emit light of different colors. Hereinafter, for convenience of description, a case where a plurality of sub-pixels include sub-pixels to emit blue light, red light, and green light, respectively will be mainly described in more detail. 
     The plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . Each of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may have a quadrangular shape. In this case, one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may have a quadrangle shape having four sides having substantially the same length, and the other two selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may have quadrangle shapes, each having two pairs of sides having substantially the same length. For example, one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may be substantially square or rhombus-shaped, and the other two selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may be substantially rectangular. In this case, substantially a square (or a rhombus) may refer to a quadrangle having a shape in which the remaining sides other than one reference side of all sides of the quadrangle have lengths within a certain error range from the one reference side. In addition, substantially a rectangle may refer to a quadrangle having a shape in which one side of a pair of sides facing oppositely away from each other (e.g., parallel to each other) has a length within a certain error range based on the other side of the pair of sides facing oppositely away from each other. For example, the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may be formed in a substantially square or rectangular shape as described above through a deposition process to be described in more detail later below. In this case, the first sub-pixel F 1 , the second sub-pixel F 2 , and/or the third sub-pixel F 3  may be substantially square (or rhombus) or rectangular in shape and may have rounded and/or chamfered corners. In addition, in the first sub-pixel F 1 , the second sub-pixel F 2 , and/or the third sub-pixel F 3 , the angles of corners formed by the sides connected to (e.g., meeting) each other may not be equal to 90 degrees and may be within a certain error range. Hereinafter, for convenience of description, the terms “square” and “rectangle” are used, but these terms should be understood as concepts that respectively include both a case “substantially square” and a case “substantially rectangle”. 
     Hereinafter, for convenience of description, a case where the first sub-pixel F 1  is square and the second sub-pixel F 2  and the third sub-pixel F 3  are rectangular will be mainly described in more detail. 
     One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  is to emit blue light, another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  is to emit red light, and the remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  is to emit green light. In this case, depending on the shape of each of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , one selected from the blue light, the red light, and the green light may be square, and the other two selected from the blue light, the red light, and the green light may be rectangular. Hereinafter, for convenience of description, a case where the first sub-pixel F 1  is to emit blue light, the second sub-pixel F 2  is to emit red light, and the third sub-pixel F 3  is to emit green light will be mainly described in more detail. Embodiments of the present disclosure are not limited to the above. For example, the first sub-pixel F 1  may emit green light. 
     The area of each of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may suitably vary. In this case, because an aperture ratio of each of the sub-pixels may be suitably adjusted, the display device  20  may be realized to perform various suitable operations in various suitable forms. 
     The first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may include a first intermediate layer  28 - 2 A, a second intermediate layer  28 - 2 B, and a third intermediate layer  28 - 2 C, respectively. In this case, the first intermediate layer  28 - 2 A, the second intermediate layer  28 - 2 B, and the third intermediate layer  28 - 2 C may include (e.g., be) materials (e.g., organic emission layers) that are to emit different pieces (e.g., different colors) of light when external power is applied thereto. 
     The first intermediate layer  28 - 2 A, the second intermediate layer  28 - 2 B, and the third intermediate layer  28 - 2 C may correspond to the shapes (e.g., planar shapes) of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , respectively. For example, the first intermediate layer  28 - 2 A may have a square shape corresponding to a square shape of the first sub-pixel F 1 . Furthermore, the second intermediate layer  28 - 2 B and the third intermediate layer  28 - 2 C may have rectangular shapes corresponding to the rectangular shapes of the second sub-pixel F 2  and the third sub-pixel F 3 , respectively. In this case, the planar area of each of the intermediate layers may be the same as or different from the planar area of each of the respective sub-pixels. For example, in an embodiment, the planar area of the first intermediate layer  28 - 2 A may be different from the planar area of the first sub-pixel F 1 , the planar area of the second intermediate layer  28 - 2 B may be the same as the planar area of the second sub-pixel F 2 , and the planar area of the third intermediate layer  28 - 2 C may be the same as the planar area of the third sub-pixel F 3 . In another embodiment, the planar area of the second intermediate layer  28 - 2 B may be different from the planar area of the second sub-pixel F 2 , the planar area of the first intermediate layer  28 - 2 A may be the same as the planar area of the first sub-pixel F 1 , and the planar area of the third intermediate layer  28 - 2 C may be the same as the planar area of the third sub-pixel F 3 . In another embodiment, the planar area of the third intermediate layer  28 - 2 C may be different from the planar area of the third sub-pixel F 3 , the planar area of the second intermediate layer  28 - 2 B may be the same as the planar area of the second sub-pixel F 2 , and the planar area of the first intermediate layer  28 - 2 A may be the same as the planar area of the first sub-pixel F 1 . In another embodiment, the planar area of the first intermediate layer  28 - 2 A may be the same as the planar area of the first sub-pixel F 1 , the planar area of the second intermediate layer  28 - 2 B may be different from the planar area of the second sub-pixel F 2 , and the planar area of the third intermediate layer  28 - 2 C may be different from the planar area of the third sub-pixel F 3 . In another embodiment, the planar area of the second intermediate layer  28 - 2 B may be the same as the planar area of the second sub-pixel F 2 , the planar area of the first intermediate layer  28 - 2 A may be different from the planar area of the first sub-pixel F 1 , and the planar area of the third intermediate layer  28 - 2 C may be different from the planar area of the third sub-pixel F 3 . In another embodiment, the planar area of the third intermediate layer  28 - 2 C may be the same as the planar area of the third sub-pixel F 3 , the planar area of the first intermediate layer  28 - 2 A may be different from the planar area of the first sub-pixel F 1 , and the planar area of the second intermediate layer  28 - 2 B may be different from the planar area of the second sub-pixel F 2 . In another embodiment, the planar area of the first intermediate layer  28 - 2 A may be different from the planar area of the first sub-pixel F 1 , the planar area of the second intermediate layer  28 - 2 B may be different from the planar area of the second sub-pixel F 2 , and the planar area of the third intermediate layer  28 - 2 C may be different from the planar area of the third sub-pixel F 3 . In another embodiment, the planar area of the first intermediate layer  28 - 2 A may be the same as the planar area of the first sub-pixel F 1 , the planar area of the second intermediate layer  28 - 2 B may be the same as the planar area of the second sub-pixel F 2 , and the planar area of the third intermediate layer  28 - 2 C may be the same as the planar area of the third sub-pixel F 3 . Here, the planar area may be an area on a plane formed by the display area DA of the display device  20 . In some embodiments, the planar area may be an area on a plane on which an image is to be implemented (e.g. displayed) when the image is implemented (e.g., generated). Hereinafter, for convenience of description, a case where the planar area of each intermediate layer is different from the planar area of a respective sub-pixel will be mainly described in more detail. 
     In such a case, the planar area of each sub-pixel may be less than the planar area of the respective intermediate layer. For example, because each intermediate layer may be formed by deposition on the display substrate D to have sufficient margin for the respective sub-pixel, light having an accurate shape may be emitted from each sub-pixel. 
     Because a relationship between the sub-pixels and a relationship between the intermediate layers are the same or similar to each other, the following description will be made mainly on the relationship between the sub-pixels for convenience of description. However, the description may also be applicable to the relationship between the intermediate layers. 
     A plurality of first sub-pixels F 1 , a plurality of second sub-pixels F 2 , and a plurality of third sub-pixels F 3  may be provided. In this case, the plurality of first sub-pixels F 1  may be spaced apart from each other in at least one selected from a first direction and a second direction. For example, some of the plurality of first sub-pixels F 1  may be arranged with each other to be spaced apart from each other in a first direction (e.g., one selected from an X-axis direction and a Y-axis direction in  FIG. 1B ), and the other ones of the plurality of first sub-pixels F 1  may be arranged with each other to be spaced apart from each other in a second direction (e.g., the other one selected from the X-axis direction and the Y-axis direction in  FIG. 1B ). For example, the plurality of first sub-pixels F 1  may be arranged with each other in rows extending along the second direction and in columns extending along the first direction (e.g., the plurality of first sub-pixels F 1  may be arranged with each other in a matrix pattern). Hereinafter, for convenience of description, a case where the first direction refers to the X-axis direction of  FIG. 1B  and the second direction refers to the Y-axis direction of  FIG. 1B  will be mainly described in more detail. 
     The centers of first sub-pixels F 1  that are arranged with each other in the first direction from among the plurality of first sub-pixels F 1  may be arranged with each other on one straight line. In this case, the first sub-pixels F 1  arranged with each other in the first direction from among the plurality of first sub-pixels F 1  may be arranged with each other in a line (e.g., a straight line) in the first direction. The first direction may be a direction perpendicular or normal to a direction in which a user on the side of the display device  20  views the display device  20 . For example, the first direction may be a direction parallel to a long side of the display device  20  or a short side of the display device  20 . For example, when the long side of the display device  20  is parallel to a window of a vehicle, the first direction may be parallel to the short side of the display device  20 . In this case, the long sides of the display device  20  may be arranged (e.g., may extend) up and down inside the vehicle. In another embodiment, when the short side of the display device  20  is parallel to a window of a vehicle, the first direction may be parallel to the long side of the display device  20 . In this case, the short sides of the display device  20  may be arranged (e.g., may extend) up and down inside the vehicle. Hereinafter, for convenience of description, a case where the first direction is parallel to the long side of the display device  20  will be mainly described in more detail. 
     In the above case, in an embodiment, the first sub-pixel F 1  may emit green light having high visibility. For example, when the first sub-pixel F 1  is to emit green light, the visibility of letters in an image implemented in (e.g., displayed by) the display device  20  may be improved. In addition, the centers of first sub-pixels F 1  arranged with each other in the second direction from among the plurality of first sub-pixels F 1  may not be arranged with each other on one straight line and may be arranged with each other in a serpentine (or zigzag) shape. 
     A first side S 1  and a second side S 2  of each of the first sub-pixels F 1  may form a set angle with each other. For example, the first side S 1  and the second side S 2  of the first sub-pixel F 1  may form a right angle with each other. In this case, the first side S 1  and the second side S 2  may be arranged tilted in different directions with respect to at least one selected from the first direction and the second direction, respectively. Accordingly, each of the first sub-pixels F 1  may be arranged in a rhombic form (e.g., may have a rhombic shape) with respect to one selected from the first direction and the second direction, and an angle formed by the two sides S 1  and S 2  adjacent to each of the vertexes of each of the first sub-pixels F 1  may be 90 degrees. For example, each of the first sub-pixels F 1  may have a square shape. 
     In this case, one second sub-pixel F 2  and one third sub-pixel F 3  may be arranged at (e.g., on) the first side S 1  or the second side S 2  of one first sub-pixel F 1  to face the first sub-pixel F 1 . In this case, the second sub-pixel F 2  and the third sub-pixel F 3  may be arranged to be tilted with respect to one selected from the first direction and the second direction. For example, the second sub-pixel F 2  and the third sub-pixel F 3  may be tilted to form an angle of 45 degrees with respect to one selected from the first direction and the second direction. For example, at least one selected from a short side and a long side of at least one selected from the second sub-pixel F 2  and the third sub-pixel F 3  may form an angle of 45 degrees with respect to a straight line connecting the centers of a plurality of first sub-pixels F 1  arranged with each other in the first direction. 
     The second sub-pixel F 2  and the third sub-pixel F 3  may have rectangular shapes. In this case, the area (e.g., planar area) of at least one selected from the second sub-pixel F 2  and the third sub-pixel F 3  may be less than the area of the first sub-pixel F 1 . Furthermore, at least one selected from the second sub-pixel F 2  and the third sub-pixel F 3  facing the first sub-pixel F 1  (e.g., facing a side of the first sub-pixel F 1 ) may be arranged to overlap one side (e.g., the first side S 1  or the second side S 2 ) of the first sub-pixel F 1  facing the second sub-pixel F 2  and the third sub-pixel F 3  or an extension line of the one side of the first sub-pixel F 1 . For example, at least a portion of the second sub-pixel F 2  and at least a portion of the third sub-pixel F 3 , which are adjacent to each other, may be arranged within a length range of one selected from the first side S 1  and the second side S 2 . 
     A short side or a long side of at least one selected from the second sub-pixel F 2  and the third sub-pixel F 3  facing the first sub-pixel F 1  may be parallel to the first side S 1  or the second side S 2 . For example, in an embodiment, extension lines of short sides of different second sub-pixels F 2  respectively facing the first side S 1  and the second side S 2  may intersect or cross with each other, or extension lines of long sides of the second sub-pixels F 2  respectively facing the first side S 1  and the second side S 2  may intersect or cross with each other. In another embodiment, extension lines of short sides of a plurality of third sub-pixels F 3  respectively facing the first side S 1  and the second side S 2  may intersect or cross with each other, or extension lines of long sides of the third sub-pixels F 3  respectively facing the first side S 1  and the second side S 2  may intersect or cross with each other. In another embodiment, the extension line of a short side of the second sub-pixel F 2  facing the first side S 1  and the extension line of a short side of the third sub-pixel F 3  facing the second side S 2  may intersect or cross with each other, or the extension line of a long side of the second sub-pixel F 2  facing the first side S 1  and the extension line of a long side of the third sub-pixel F 3  facing the second side S 2  may intersect or cross with each other. In another embodiment, the extension line of a long side of the second sub-pixel F 2  facing the first side S 1  and the extension line of a short side of the third sub-pixel F 3  facing the second side S 2  may intersect or cross with each other, or the extension line of a short side of the second sub-pixel F 2  facing the first side S 1  and the extension line of a long side of the third sub-pixel F 3  facing the second side S 2  may intersect or cross with each other. 
     The plurality of second sub-pixels F 2  may be spaced apart from each other in at least one selected from the first direction and the second direction. In this case, the centers of some of a plurality of second sub-pixels F 2  arranged with each other in one selected from the first direction and the second direction may be arranged with each other on a straight line, and the centers of the other ones of the plurality of second sub-pixels F 2  arranged with each other in the other one selected from the first direction and the second direction may be arranged with each other in a serpentine (or zigzag) shape in the other one selected from the first direction and the second direction. Hereinafter, for convenience of description, a case where the centers of some of a plurality of second sub-pixels F 2  arranged with each other in the first direction are arranged with each other on a straight line and the centers of the other ones of a plurality of second sub-pixels F 2  arranged with each other in the second direction are arranged with each other in a serpentine shape will be mainly described in more detail. 
     The plurality of third sub-pixels F 3  may also be arranged with each other to be spaced apart from each other in at least one selected from the first direction and the second direction similarly to the second sub-pixels F 2 . In this case, the plurality of third sub-pixels F 3  may also be arranged with each other similarly to the second sub-pixels F 2 . Hereinafter, for convenience of description, a case where the centers of some of a plurality of third sub-pixels F 3  arranged with each other in the first direction from among the plurality of third sub-pixels F 3  are arranged with each other on a straight line and the centers of the other ones of a plurality of third sub-pixels F 3  arranged with each other in the second direction from among the plurality of third sub-pixels F 3  are arranged with each other in a serpentine shape will be mainly described in more detail. 
     In this case, one selected from the second sub-pixel F 2  and the third sub-pixel F 3  facing the first side S 1  of the first sub-pixel F 1  may be arranged to be symmetrical (e.g., reflectively symmetrical) with one selected from the second sub-pixel F 2  and the third sub-pixel F 3  facing the second side S 2  of the first sub-pixel F 1  with respect to a straight line (otherwise, a straight line parallel to the first direction while passing through the centers of two adjacent first sub-pixels F 1 ) connecting the centers of first sub-pixels F 1  arranged in the first direction. For example, the second sub-pixel F 2  facing the first side S 1  may be symmetrical with the third sub-pixel F 3  facing the second side S 2  with respect to the straight line. Also, the third sub-pixel F 3  facing the first side S 1  may be symmetrical with the second sub-pixel F 2  facing the second side S 2  with respect to the straight line. A distance between the centers of adjacent second sub-pixels F 2  (e.g., second sub-pixels F 2  adjacent along the first direction and/or the second direction) may be the same as a distance between the centers of adjacent third sub-pixels F 3  (e.g., third sub-pixels F 3  adjacent along the first direction and/or the second direction). In another embodiment, the second sub-pixel F 2  and the third sub-pixel F 3  facing the first side S 1  may be symmetrical with the second sub-pixel F 2  and the third sub-pixel F 3  facing the second side S 2 , respectively. A distance between the centers of one selected from a pair of second sub-pixels F 2  and a pair of third sub-pixels F 3  arranged symmetrically with respect to each other may be less than a distance between the centers of the other one selected from the pair of second sub-pixels F 2  and the pair of third sub-pixels F 3  arranged symmetrically with respect to each other. In this case, a pair of second sub-pixels F 2  adjacent to each other may be arranged between a pair of third sub-pixels F 3  adjacent to each other or the pair of third sub-pixels F 3  adjacent to each other may be arranged between the pair of second sub-pixels F 2  adjacent to each other. However, hereinafter, for convenience of description, a case where the second sub-pixel F 2  and the third sub-pixel F 3  are arranged to be symmetrical with each other with respect to a straight line connecting the centers of first sub-pixels F 1  arranged in the first direction will be mainly described in more detail. 
     The second sub-pixel F 2  and the third sub-pixel F 3  may have the same size (e.g., planar area). For example, the planar area of the second sub-pixel F 2  may be equal to the planar area of the third sub-pixel F 3 . In this case, the length of a short side of the second sub-pixel F 2  may be equal to the length of a short side of the third sub-pixel F 3 , and the length of a long side of the second sub-pixel F 2  may be equal to the length of a long side of the third sub-pixel F 3 . In this case, the second intermediate layer  28 - 2 B and the third intermediate layer  28 - 2 C respectively arranged in the second sub-pixel F 2  and the third sub-pixel F 3  may also have the same size (e.g., planar area) similarly to the second sub-pixel F 2  and the third sub-pixel F 3 . 
     The shortest distances from two sub-pixels facing one side of the first sub-pixel F 1  to the one side of the first sub-pixel F 1  may be different from each other. For example, a first distance L 1  that is the shortest distance from an edge of the first sub-pixel F 1  to the second sub-pixel F 2  and a second distance L 2  that is the shortest distance from the edge of the first sub-pixel F 1  to the third sub-pixel F 3  may be different from each other. For example, the first distance L 1  may be less than the second distance L 2 . In this case, the shortest distance may be measured from the first side S 1  or the second side S 2  to one side of the second sub-pixel F 2  or one side of the third sub-pixel F 3  in a direction perpendicular to one selected from the first side S 1  and the second side S 2 . In another embodiment, the shortest distance may be measured from the first side S 1  or the second side S 2  to one side of the second sub-pixel F 2  or one side of the third sub-pixel F 3  in a direction perpendicular to an extension line of one of the first side S 1  and the second side S 2 . However, hereinafter, for convenience of description, a case where the shortest distance is a distance measured from the first side S 1  or the extension line of the first side S 1  to the second sub-pixel F 2  or the third sub-pixel F 3  facing the first side S 1  will be mainly described in more detail. In another embodiment, the shortest distance may be measured as a distance from the center of the first sub-pixel F 1  to the center of the second sub-pixel F 2  or a distance from the center of the first sub-pixel F 1  to the center of the third sub-pixel F 3 . In some embodiments, the shortest distance may be measured as a distance from the first side S 1  of the first sub-pixel F 1  or the extension line of the first side S 1  to the center of the second sub-pixel F 2  or to the center of the third sub-pixel F 3 . 
     In addition to the above cases, distances from edges (or sides) of one selected from a second sub-pixel F 2  and a third sub-pixel F 3  facing the same first sub-pixel F 1  to an edge (or one side) of the first sub-pixel F 1  may be different from each other. For example, a first distance L 1  from a short side of a second sub-pixel F 2  facing the first side S 1  of the first sub-pixel F 1  to the first side S 1  may be different from a third distance L 3  from a short side of a second sub-pixel F 2  facing the second side S 2  to the second side S 2 . In addition, a second distance L 2  from a short side of a third sub-pixel F 3  facing the first side S 1  of the first sub-pixel F 1  to the first side S 1  may be different from a fourth distance L 4  from a short side of a third sub-pixel F 3  facing the second side S 2  to the second side S 2 . In this case, the third distance L 3  may be equal to the second distance L 2 , and the fourth distance L 4  may be equal to the first distance L 1 . 
     Furthermore, the shortest distances from an edge of at least one selected from a second sub-pixel F 2  and a third sub-pixel F 3  arranged between adjacent first sub-pixels F 1  to edges of the first sub-pixels F 1  that are different from each other. For example, the first distance L 1  from a short side of a second sub-pixel F 2  facing the first side S 1  of the first sub-pixel F 1  to the first side S 1  may be different from a sixth distance L 6  from a short side of the second sub-pixel F 2  facing one side of another adjacent first sub-pixel F 1  to the one side of the other adjacent first sub-pixel F 1 . In addition, the second distance L 2  from a short side of a third sub-pixel F 3  facing the first side S 1  of the first sub-pixel F 1  to the first side S 1  may be different from a fifth distance L 5  from a short side of the third sub-pixel F 3  facing one side of another adjacent first sub-pixel F 1  to the one side of the other adjacent first sub-pixel F 1 . In this case, the above relationship may be the same for a long side of the second sub-pixel F 2  and a long side of the third sub-pixel F 3 , and may be equally or similarly applied to the first intermediate layer  28 - 2 A, the second intermediate layer  28 - 2 B, and the third intermediate layer  28 - 2 C. 
     In this case, a seventh distance L 7  between one side of the first sub-pixel F 1  and a long side of the second sub-pixel F 2  which face each other, an eighth distance L 8  between a long side of the second sub-pixel F 2  and a long side of the third sub-pixel F 3  which face each other, and a ninth distance L 9  between a long side of the third sub-pixel F 3  and one side of the first sub-pixel F 1  which face each other may be equal to one another. In this case, the seventh distance L 7  to the ninth distance L 9  may be greater than or equal to the first distance L 1  and less than the second distance L 2 . For example, the distances described above may maintain the rigidity of a mask sheet, which will be described later, by providing a width of a mask sheet portion arranged between openings of the mask sheet. In addition, intermediate layers may be prevented from overlapping and/or being connected to each other through the distances, or the amount of overlap and/or connection may be reduced. 
     An outline R connecting a portion of an edge of the second sub-pixel F 2  facing one side of the first sub-pixel F 1  to a portion of the third sub-pixel F 3  may be square (e.g., a portion of a square). For example, the outline R may be drawn by connecting the remaining edge of the second sub-pixel F 2  and the remaining edge of the third sub-pixel F 3  excluding one side of the second sub-pixel F 2  and one side of the third sub-pixel F 3  in which the second sub-pixel F 2  and the third sub-pixel F 3  face each other and by connecting a vertex of the second sub-pixel F 2  and a vertex of the third sub-pixel F 3  facing each other at a portion where the second sub-pixel F 2  and the third sub-pixel F 3  are apart from each other. In some embodiments, the outline R may be defined by one long side of the second sub-pixel F 2  that faces oppositely away from the third sub-pixel F 3 , one long side of the third sub-pixel F 3  that faces oppositely away from the second sub-pixel F 2 , one short side of the second sub-pixel F 2 , one short side of the third sub-pixel F 3  that faces oppositely away from the one short side of the second-sub-pixel F 2 , an extension line extending from the one long side of the second sub-pixel F 2  to meet an extension line extending from the one short side of the third sub-pixel F 3 , the extension line extending from the one short side of the third sub-pixel F 3 , an extension line extending from the one long side of the third sub-pixel F 3  to meet an extension line extending from the one short side of the second sub-pixel F 2 , and the extension line extending from the one short side of the second sub-pixel F 2 . The outline R forms a square, and thus, the second sub-pixel F 2  and the third sub-pixel F 3  may be arranged at the second side S 2  by rotating the second sub-pixel F 2  and the third sub-pixel F 3  arranged at the first side S 1  so that the arrangement of the second sub-pixel F 2  and the third sub-pixel F 3  arranged at the second side S 2  may correspond to the arrangement of the second sub-pixel F 2  and the third sub-pixel F 3  facing the first side S 1 . 
     The first intermediate layer  28 - 2 A, the second intermediate layer  28 - 2 B, and the third intermediate layer  28 - 2 C respectively forming (e.g., in or corresponding to) the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may be formed and arranged to be the same as or similar to the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , respectively. The centers of the first intermediate layer  28 - 2 A, the second intermediate layer  28 - 2 B, and the third intermediate layer  28 - 2 C may be arranged at positions that are the same as or different from those of the centers of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , respectively. The descriptions of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  given above may be applied to the first intermediate layer  28 - 2 A, the second intermediate layer  28 - 2 B, and the third intermediate layer  28 - 2 C, respectively. 
     A spacer P may be arranged between the first sub-pixel F 1  and the second sub-pixel F 2  and/or between the first sub-pixel F 1  and the third sub-pixel F 3 . In this case, the spacer P may be arranged on the pixel-defining layer  29  or integrally formed with the pixel-defining layer  29 . The spacer P may have various suitable shapes. For example, a plurality of spacers P may be formed in the form of protrusions, and the plurality of spacers P may be arranged to be spaced apart from each other on the pixel-defining layer  29 . In another embodiment, one spacer P may be provided in a space between sub-pixels adjacent to each other (or between intermediate layers adjacent to each other). The spacer P is not limited to the above case, and when each of mask sheets enters an opening of the pixel-defining layer  29  or a deposition material is deposited on the display substrate D, the mask sheet may be in close contact with the pixel-defining layer  29  and contact the display substrate D to thereby prevent or reduce the occurrence of a defect in which a portion of the display substrate D is damaged and/or broken. For example, the spacer P may maintain a gap between the end of an opening area of the pixel-defining layer  29  and each mask assembly when the mask assembly is in close contact with the display substrate D. In this case, the spacer P may be arranged so as not to overlap each of the intermediate layers. Hereinafter, for convenience of description, a case where the spacer P is arranged between the first side S 1  and the third sub-pixel F 3  and/or between the second side S 2  and the second sub-pixel F 2  will be mainly described in more detail. For example, one spacer P may be between the first side S 1  and the third sub-pixel F 3 , and another spacer P may be between the second side S 2  and the second sub-pixel F 2 . 
     The spacer P as described above may be integrally formed simultaneously or concurrently with the pixel-defining layer  29  when the pixel-defining layer  29  is formed, or may be separately formed on the pixel-defining layer  29  after the pixel-defining layer  29  is formed. In this case, the spacer P may utilize a material that is the same as or different from that of the pixel-defining layer  29 . Hereinafter, for convenience of description, a case where the spacer P utilizes a material that is the same as that of the pixel-defining layer  29  will be mainly described in more detail. 
     Distances from sub-pixels facing the edge of the spacer P to the edge of the spacer P may be the same. For example, a tenth distance L 10  from one side of the first sub-pixel F 1  facing the edge of the spacer P to the edge of the spacer P, an eleventh distance L 11  from a short side of the second sub-pixel F 2  facing the edge of the spacer P to the edge of the spacer P, and a twelfth distance L 12  from a short side of the third sub-pixel F 3  facing the edge of the spacer P to the edge of the spacer P may be equal to one another. 
     An apparatus for manufacturing a display device to be described in more detail later below may form various suitable layers on the display substrate D. For example, the apparatus for manufacturing the display device may form at least one of the intermediate layers  28 - 2  on the display substrate D. In more detail, the apparatus for manufacturing the display device may form at least one selected from an organic emission layer, a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, and a functional layer in the intermediate layer  28 - 2 . For example, when the apparatus for manufacturing the display device forms at least one selected from the layers in the intermediate layer  28 - 2  on the display substrate D, the apparatus for manufacturing the display device may manufacture one layer through a plurality of deposition materials or may simultaneously or concurrently manufacture a plurality of layers. The thin-film encapsulation layer E may include a plurality of inorganic layers or may include an inorganic layer and an organic layer. 
     The organic layer of the thin-film encapsulation layer E may be formed of a polymer and may include (e.g., be) polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyoxymethylene, polyarylate, hexamethyldisiloxane, acrylic resin (e.g., polymethyl methacrylate, polyacrylic acid, etc.), or any combination thereof. 
     The inorganic layer of the thin-film encapsulation layer E may be a single layer or stacked layer including (e.g., being) a metal oxide and/or a metal nitride. For example, the inorganic layer may include (e.g., be) SiNx (SiN x ), Al 2 O 3 , SiO 2 , and/or TiO 2 . 
     An uppermost layer of the thin-film encapsulation layer E that is exposed to the outside may include an inorganic layer in order to prevent or block moisture from penetrating into an organic light-emitting device  28 . 
     The thin-film encapsulation layer E may include at least one sandwich structure in which at least one organic layer is inserted between at least two inorganic layers. As another example, the thin-film encapsulation layer E may include at least one sandwich structure in which at least one inorganic layer is between at least two organic layers. As another example, the thin-film encapsulation layer E may include a sandwich structure in which at least one organic layer is between at least two inorganic layers and a sandwich structure in which at least one inorganic layer is between at least two organic layers (e.g., a structure wherein organic layers and inorganic layers are alternately arranged with each other in a stacked arrangement). 
     The thin-film encapsulation layer E may sequentially include a first inorganic layer, a first organic layer, and a second inorganic layer from an upper portion of the organic light-emitting device  28  (e.g., sequentially stacked from an upper surface of the organic light-emitting device). 
     As another example, the thin-film encapsulation layer E may sequentially include a first inorganic layer, a first organic layer, a second inorganic layer, a second organic layer, and a third inorganic layer from an upper portion of the organic light-emitting device  28 . 
     As another example, the thin-film encapsulation layer E may sequentially include a first inorganic layer, a first organic layer, a second inorganic layer, a second organic layer, a third inorganic layer, a third organic layer, and a fourth inorganic layer from an upper portion of the organic light-emitting device  28 . 
     A halogenated metal layer including (e.g., being) LiF may be further between the organic light-emitting device  28  and the first inorganic layer. The halogenated metal layer may prevent the organic-light emitting device  28  from being damaged, or may reduce such damage, when the first inorganic layer is formed by sputtering. 
     The area (e.g., planar area) of the first organic layer may be less than the area (e.g., planar area) of the second inorganic layer, and the area (e.g., planar area) of the second organic layer may also be less than the area (e.g., planar area) of the third inorganic layer. 
     When a plurality of inorganic layers are provided as described above, the inorganic layers may be deposited to be in direct contact with each other at (e.g., in) an edge region of the display device  20 , and organic layers may not be exposed to the outside. For example, the inorganic layers may extend beyond the organic layers in the plan view to come into contact with each other and encapsulate the organic layers. 
     The display device  20  as described above may be fixed to a device such as a vehicle for moving a user. The display device  20  may be fixed to the device to form an angle different from 0 degrees between a user&#39;s viewing direction (e.g., a direction along a virtual line extending from the user&#39;s eyes to the display device  20 ) and the first direction or the second direction. For example, the display device  20  may be arranged such that the user&#39;s viewing direction of the display device  20  and the first direction or the second direction form an angle of 90 degrees. In this case, each of the sub-pixels may be arranged tilted with respect to the user&#39;s viewing direction (e.g., the Y-axis direction in  FIG. 1B ), as described above. Hereinafter, for convenience of description, a case where the user&#39;s viewing direction of the display device  20  and the first direction form an angle of 90 degrees will be mainly described in more detail. 
     In the above case, when a user looks at the display device  20 , an inclined portion of the pixel-defining layer  29  is not perpendicular to the user&#39;s viewing direction. Accordingly, external light may be prevented from being reflected through (e.g., from) the inclined portion of the pixel-defining layer  29  and being incident on the user&#39;s eyes, or the amount of external light reflected through the inclined portion of the pixel-defining layer  29  may be reduced. 
     Furthermore, the display device  20  may implement a precise image through each sub-pixel. 
       FIG. 4  is a front view of an apparatus for manufacturing the display device  20  shown in  FIG. 1B .  FIG. 5  is a cross-sectional view of a first deposition unit shown in  FIG. 4 .  FIG. 6  is a perspective view of a first mask assembly shown in  FIG. 5 .  FIG. 7  is a plan view of a portion of a first mask sheet shown in  FIG. 6 .  FIG. 8  is a plan view of a portion of a second mask sheet utilized in a second deposition unit shown in  FIG. 4 .  FIG. 9  is a plan view of a portion of a third mask sheet utilized in a third deposition unit shown in  FIG. 4 . 
     Referring to  FIGS. 4 to 9 , an apparatus  100  for manufacturing a display device (hereinafter, referred to as a display device manufacturing apparatus) may include a device for loading the display substrate D, a device for manufacturing the display substrate D, a device for forming an intermediate layer on the display substrate D, a device for forming an opposite electrode on the display substrate D, a device for forming a thin-film encapsulation layer on the display substrate D, a device for unloading the display substrate D, and/or the like. In this case, in an embodiment, the display device manufacturing apparatus  100  may be formed by connecting the above-described devices in an in-line form (e.g., by connecting and/or arranging the above-described devices along a line). In another embodiment, in the display device manufacturing apparatus  100 , only some of the devices described above may be arranged in an in-line form, and the other ones of the devices may be arranged to be separated from a portion of the in-line form. For example, the other ones of the devices may not be connected and/or arranged along a line along which the some of the devices are connected and/or arranged. In another embodiment, the display device manufacturing apparatus  100  may also be formed by arranging the devices separately. However, hereinafter, for convenience of description, a case where the display device manufacturing apparatus  100  includes the device for loading the display substrate D, the device for forming an intermediate layer, and the device for unloading the display substrate D will be mainly described in more detail. 
     The display device manufacturing apparatus  100  may include a loading unit  110 , a first deposition unit  120 , a second deposition unit  130 , a third deposition unit  140 , and an unloading unit  150 . In addition, the display device manufacturing apparatus  100  may include a shielding unit  160  arranged between devices connected to each other to disconnect or connect the spaces of the devices. 
     The first deposition unit  120 , the second deposition unit  130 , and the third deposition unit  140  may deposit a first intermediate layer, a second intermediate layer, and a third intermediate layer on the display substrate D in various suitable orders. For example, the first deposition unit  120  may deposit one selected from the first intermediate layer, the second intermediate layer, and the third intermediate layer on the display substrate D, the second deposition unit  130  may deposit another one selected from the first intermediate layer, the second intermediate layer, and the third intermediate layer on the display substrate D, and the third deposition unit  140  may deposit the remaining one selected from the first intermediate layer, the second intermediate layer, and the third intermediate layer on the display substrate D. However, hereinafter, for convenience of description, a case where the first deposition unit  120  deposits the first intermediate layer on the display substrate D, the second deposition unit  130  deposits the second intermediate layer on the display substrate D, and the third deposition unit  140  deposits the third intermediate layer on the display substrate D will be mainly described in more detail. Furthermore, a case where the first intermediate layer, the second intermediate layer, and the third intermediate layer have the same shape and arrangement as the first sub-pixel, the second sub-pixel, and the third sub-pixel described with reference to  FIGS. 1A to 3  above will be mainly described in more detail. 
     In the loading unit  110 , the display substrate D may be inserted from the outside and temporarily stored. In this case, the loading unit  110  may store a plurality of display substrates D or one display substrate D. The loading unit  110  may receive the display substrate D from the outside through a robot arm and/or a movable shuttle arranged therein and may supply the display substrate D to the first deposition unit  120 . Hereinafter, for convenience of description, a case where the loading unit  110  supports the display substrate D through the robot arm therein and the display substrate D supplied from the robot arm is mounted onto a shuttle and supplied to the first deposition unit  120  from the loading unit  110  will be mainly described in more detail. 
     The first deposition unit  120  may deposit the first intermediate layer on the display substrate D. In this case, the first deposition unit  120  may be one or more (e.g., may be provided in plurality). For example, in an embodiment, when one first deposition unit  120  is provided, the first deposition unit  120  may form at least one layer of the first intermediate layer. The first deposition unit  120  may include at least one first deposition source  122  to form one layer of the first intermediate layer on the display substrate D. For example, when a plurality of first deposition sources  122  are provided so that the first deposition unit  120  forms a plurality of layers of the first intermediate layer, each of the first deposition sources  122  may be replaceable. In this case, the first deposition sources  122  may store different deposition materials. In another embodiment, when a plurality of first deposition units  120  are provided, the first deposition units  120  may deposit the plurality of layers of the first intermediate layer on the display substrate D, respectively. In this case, the first deposition units  120  may deposit different deposition materials on the display substrate D, respectively. However, hereinafter, for convenience of description, a case where only one first deposition source  122  is provided, and the first deposition source  122  forms only an organic emission layer of the first intermediate layer, will be mainly described in more detail. 
     The first deposition unit  120  may include a first chamber  121 , the first deposition source  122 , a first mask assembly  123 , a first substrate supporting portion  124 , a first mask supporting portion  125 , a first magnetic force generating portion  126 , and a first pressure regulating portion  127 . 
     A space may be formed in the first chamber  121 , and one side of the first chamber  121  may be opened to allow the display substrate D to be drawn out or contained. In this case, the shielding unit  160  including a gate valve and/or the like is arranged in the opened portion of the first chamber  121  and may be selectively opened and closed. 
     The first deposition source  122  may contain a first deposition material for forming at least one layer of the first intermediate layer. The first deposition source  122  may vaporize and/or sublimate the first deposition material by applying energy (e.g., thermal energy, light energy, vibration energy, etc.). 
     The first deposition source  122  as described above may be replaceable. The first deposition source  122  may be replaced with a new first deposition source  122  when the contained first deposition material is exhausted. 
     The first mask assembly  123  may include a first mask frame  123 - 1 , a first mask sheet  123 - 2 , and a first support frame  123 - 3 . 
     The first mask frame  123 - 1  may have an opening at the center thereof. In this case, the first mask frame  123 - 1  may be formed in a window frame shape. In another embodiment, the first mask frame  123 - 1  may have an opening at the center thereof, and a separate frame dividing the opening into a lattice form may be arranged. Hereinafter, for convenience of description, a case where the first mask frame  123 - 1  has an opening at the center thereof will be mainly described in more detail. 
     The first mask sheet  123 - 2  is arranged on one side of the first mask frame  123 - 1  under tension in at least one selected from the first direction and the second direction and may be fixed to the first mask frame  123 - 1  through welding and/or the like. The first mask frame  123 - 1  may be formed with a groove to accommodate the first mask sheet  123 - 2 . The first mask sheet  123 - 2  may be formed in a rectangular shape and may be arranged at (e.g., as or on) one side of the first mask frame  123 - 1 . Further, the first mask sheet  123 - 2  may be formed in a slit shape. 
     The first mask sheet  123 - 2  may be plural (e.g., provided in plural). The plurality of first mask sheets  123 - 2  may be arranged with each other in a line to be adjacent to each other in the first direction or the second direction. For example, a long side of the first mask sheet  123 - 2  may be arranged to be parallel to a long side or a short side of the first mask frame  123 - 1 . Hereinafter, for convenience of description, a case where a long side of the first mask sheet  123 - 2  is arranged in the X-axis direction of  FIG. 6  will be mainly described in more detail. 
     The first mask sheet  123 - 2  may have a plurality of first openings  123 - 4 . The plurality of first openings  123 - 4  may be arranged with each other to be spaced apart from each other in the first direction and the second direction. For example, each of the first openings  123 - 4  may be rhombic (e.g., may have a rhombic planar shape) with a vertex arranged in a tensile direction (e.g., X direction of  FIG. 6 ) of the first mask sheet  123 - 2 . In some embodiments, the tensile direction is the direction in which the first mask sheet  123 - 2  is under tension. In some embodiments, each of the first openings  123 - 4  may be in the form of a square having an angle of 90 degrees formed by two sides adjacent to each vertex (e.g., formed by two sides extending from the vertex). In this case, the centers of some of the plurality of first openings  123 - 4  may be arranged with each other on a line in one selected from the tensile direction of the first mask sheet  123 - 2  and a direction perpendicular to the tensile direction of the first mask sheet  123 - 2 . In addition, the centers of the other ones of the plurality of first openings  123 - 4  may be arranged with each other in a serpentine shape in one selected from the tensile direction of the first mask sheet  123 - 2  and the direction perpendicular to the tensile direction of the first mask sheet  123 - 2 . In this case, the plurality of first openings  123 - 4  may be arranged with each other to correspond to the arrangement of the first sub-pixels described with reference to  FIGS. 1B to 3 . In the case where the first opening  123 - 4  is formed as described above, even if the first mask sheet  123 - 2  is under tension, a tensile shape of the first mask sheet  123 - 2  may be predicted to some extent. 
     The first support frame  123 - 3  may be arranged in the first mask frame  123 - 1  to support the first mask sheet  123 - 2  as well as the first mask frame  123 - 1 . The first support frame  123 - 3  may be arranged in the first mask frame  123 - 1  in a lattice shape to define a display area of one display device. For example, the first support frame  123 - 3  may define a plurality of display areas by dividing a central opening of the first mask frame  123 - 1  into a plurality of areas. 
     The first substrate supporting portion  124  may support the display substrate D. The first substrate supporting portion  124  may support the display substrate D by placing the display substrate D thereon or by adsorbing or coupling (e.g., attaching) one surface of the display substrate D thereto. For example, the first substrate supporting portion  124  may include a frame, a bar, and/or the like that is fixed within the first chamber  121 . In another embodiment, the first substrate supporting portion  124  may include a clamp for holding the display substrate D. In another embodiment, the first substrate supporting portion  124  may include an adhesive chuck and/or an electrostatic chuck. In this case, the first substrate supporting portion  124  may be formed integrally with the first magnetic force generating portion  126 . In another embodiment, the first substrate supporting portion  124  may also include a shuttle for transferring the display substrate D from the loading unit  110 . However, hereinafter, for convenience of description, a case where the first substrate supporting portion  124  includes a shuttle will be mainly described in more detail. 
     The first mask supporting portion  125  may support the first mask assembly  123 . Because the first mask supporting portion  125  may be the same as or similar to the first substrate supporting portion  124  described above, a more detailed descriptions thereof may not be provided herein for convenience of description. Hereinafter, a case where the first mask supporting portion  125  includes a frame fixed within the first chamber  121  and the first mask assembly  123  is placed and supported on the frame will be mainly described in more detail. 
     The first magnetic force generating portion  126  may be arranged in the first chamber  121  to bring the first mask frame  123 - 1  into close contact with the display substrate D. Here, the first magnetic force generating portion  126  may include an electromagnet. 
     The first pressure regulating portion  127  may be coupled (e.g., connected) to the first chamber  121  to adjust pressure inside the first chamber  121 . The first pressure regulating portion  127  may include a pipe coupled (e.g., connected) to the first chamber  121  and a pump arranged in the pipe. 
     The second deposition unit  130  may deposit a second deposition material on the display substrate D on which the first intermediate layer is formed to form the second intermediate layer. The second deposition unit  130  may be similar to the first deposition unit  120  described above. The second deposition unit  130  may include a second mask sheet  133 - 2 . The second mask sheet  133 - 2  may be similar to the first mask sheet  123 - 2 . In this case, the second mask sheet  133 - 2  may have a plurality of second openings  133 - 4 . The plurality of second openings  133 - 4  may be spaced apart from each other. Some of the plurality of second openings  133 - 4  may be tilted in one direction with respect to a tensile direction (e.g., the X-axis direction in  FIG. 8 ) of the second mask sheet  133 - 2 . For example, the plurality of second openings  133 - 4  may each have a rectangular shape in the plan view, and some of the plurality of second openings  133 - 4  have a length extending in a direction tilted in the one direction with respect to the tensile direction. The other ones of the plurality of second openings  133 - 4  may be tilted in a direction different (e.g., may have a length extending in a direction tilted in the different direction) from the one direction of the some of the plurality of second openings  133 - 4  with respect to the tensile direction of the second mask sheet  133 - 2 . For example, the plurality of second openings  133 - 4  may be tilted to have an angle different from 0 degrees with respect to the tensile direction of the second mask sheet  133 - 2 . For example, the plurality of second openings  133 - 4  may be arranged to form an angle of 45 degrees with respect to the tensile direction of the second mask sheet  133 - 2 . 
     In an embodiment, the centers of the second openings  133 - 4  may form a straight line in one direction. For example, the centers of the some of the plurality of second openings  133 - 4  may form a straight line, and the centers of the other ones of the plurality of second openings  133 - 4  may not form a straight line. For example, among the plurality of second openings  133 - 4  described above, the centers of second openings  133 - 4  in a line which are arranged with each other in one selected from the tensile direction of the second mask sheet  133 - 2  and a direction perpendicular to the tensile direction of the second mask sheet  133 - 2  may form a straight line. On the other hand, among the plurality of second openings  133 - 4 , the centers of second openings  133 - 4  arranged with each other in the other one selected from the tensile direction of the second mask sheet  133 - 2  and the direction perpendicular to the tensile direction of the second mask sheet  133 - 2  may be arranged with each other in a serpentine shape (or a zigzag shape). However, hereinafter, for convenience of description, a case where the centers of the some of the plurality of second openings  133 - 4  form a straight line and the centers of the other ones of the plurality of second openings  133 - 4  do not form a straight line will be mainly described in more detail. The plurality of second openings  133 - 4  may be rectangular. 
     The second mask sheet  133 - 2  may be fixed to a second mask frame in a state where a tensile force is applied to the second mask sheet  133 - 2 , as described above. In this case, when the plurality of second openings  133 - 4  are all tilted in the same direction with respect to a tensile direction of the second mask sheet  133 - 2 , deformation of the second mask sheet  133 - 2  may exceed a predictable range because degrees of deformation between the right and left or the front and back of the second mask sheet  133 - 2  are different from each other. For example, in the above case, one portion of the second mask sheet  133 - 2  is largely deformed and the other portion of the second mask sheet  133 - 2  is not deformed or slightly deformed so that the shape of a second opening  133 - 4  may be distorted or the shape of the some of the plurality of second openings  133 - 4  and the shape of the other ones of the plurality of second openings  133 - 4  may be different from each other. Furthermore, in the above case, the centers of the some of the plurality of second openings  133 - 4  may not be on a line. 
     However, as described above, the some of the plurality of second openings  133 - 4  and the other ones of the plurality of second openings  133 - 4  are formed on the second mask sheet  133 - 2  by being tilted in different directions with respect to the tensile direction of the second mask sheet  133 - 2 . Therefore, the degree of deformation of the second mask sheet  133 - 2  during tensioning of the second mask sheet  133 - 2  may be uniformly maintained throughout the entire second mask sheet  133 - 2 . For example, it is possible to induce uniform deformation throughout the second mask sheet  133 - 2  by tilting second openings  133 - 4  adjacent to each other in different directions with respect to the tensile direction of the second mask sheet  133 - 2 . 
     The third deposition unit  140  may deposit a third deposition material on the display substrate D on which the first intermediate layer and the second intermediate layer are formed to form the third intermediate layer. Here, the first intermediate layer, the second intermediate layer, and the third intermediate layer may be arranged so as not to overlap each other on a plane. The third deposition unit  140  may be similar to the first deposition unit  120 . The third deposition unit  140  may include a third mask sheet  143 - 2  including a plurality of third openings  143 - 4 . In this case, the third mask sheet  143 - 2  may be similar to the second mask sheet  133 - 2 , and the third openings  143 - 4  may be arranged with each other similarly to the second openings  133 - 4 . However, when the second mask sheet  133 - 2  and the third mask sheet  143 - 2  are arranged to be stacked on each other, the second mask sheet  133 - 2  and the third mask sheet  143 - 2  may be manufactured such that the second openings  133 - 4  and the third openings  143 - 4  do not overlap each other. 
     The unloading unit  150  temporarily stores the display substrate D on which the first intermediate layer, the second intermediate layer, and the third intermediate layer are respectively formed, and may unload the display substrate D to the outside or may transfer the display substrate D to another device. The unloading unit  150  may include a robot arm and/or the like for transferring the display substrate D therein. 
     As described above, the display substrate D, on which the first intermediate layer, the second intermediate layer, and the third intermediate layer are respectively formed, may be manufactured as the display device by forming the opposite electrode on the first intermediate layer, the second intermediate layer, and the third intermediate layer, and by forming the thin-film encapsulation layer. 
     Referring to the operation of the display device manufacturing apparatus  100 , the display device manufacturing apparatus  100  may manufacture the first sub-pixel, the second sub-pixel, and the third sub-pixel in various suitable orders as described above. However, hereinafter, for convenience of description, a case where the display device manufacturing apparatus  100  sequentially manufactures the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  shown in  FIGS. 1B to 3  will be mainly described in more detail. 
     After the display substrate D is transferred to the loading unit  110 , the loading unit  110  may transfer the display substrate D to the first deposition unit  120 . 
     The first deposition unit  120  may supply the first deposition material to the first deposition source  122  to form the first intermediate layer on the display substrate D. The first deposition material may be deposited on the display substrate D through the first openings  123 - 4 . In this case, the first intermediate layer may have a square shape that is tilted with respect to the tensile direction of the first mask sheet  123 - 2 . 
     After the above process is completed, the display substrate D is transferred from the first deposition unit  120  to the second deposition unit  130  and then the second deposition material may be deposited on the display substrate D in the second deposition unit  130 . The second deposition unit  130  may form a pair of adjacent second intermediate layers which are tilted in different directions with respect to the tensile direction of the second mask sheet  133 - 2  on the display substrate D. 
     Thereafter, the display substrate D may be transferred from the second deposition unit  130  to the third deposition unit  140 . The third deposition unit  140  may supply the third deposition material to the display substrate D and the third deposition material that has passed through the third openings  143 - 4  may be deposited on the display substrate D. The third deposition unit  140  may form a pair of adjacent third intermediate layers which are tilted in different directions with respect to the tensile direction of the third mask sheet  143 - 2  on the display substrate D. 
     The display substrate D on which the first intermediate layer, the second intermediate layer, and the third intermediate layer are formed may be taken out through the unloading unit  150  or may be supplied to a device for the next operation. Thereafter, the opposite electrode and the thin-film encapsulation layer may be formed on the display substrate D to complete the manufacture of the display device. 
     Therefore, according to the display device manufacturing apparatus  100  and a method (hereinafter, referred to as a display device manufacturing method) of manufacturing a display device, it is possible to manufacture the display device having an accurate deposition pattern. 
     Furthermore, according to the display device manufacturing apparatus  100  and the display device manufacturing method, it is possible to reduce an error between a design pattern and an actual deposition pattern that may occur during manufacturing. 
       FIG. 10  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment.  FIG. 11  is a plan view of a portion of a second mask sheet for depositing a second intermediate layer shown in  FIG. 10 .  FIG. 12  is a plan view of a portion of a third mask sheet for depositing a third intermediate layer shown in  FIG. 10 . 
     Referring to  FIGS. 10 to 12 , a display device may include a display area and a non-display area defined on a substrate, the non-display area being around the display area. A plurality of sub-pixels including a first sub-pixel F 1 ′, a second sub-pixel F 2 ′, and a third sub-pixel F 3 ′ may be arranged in the display area, and a power line may be arranged in the non-display area. In addition, a pad portion may be arranged in the non-display area. The display device may include a display substrate, an intermediate layer arranged in the display area, an opposite electrode, and a thin-film encapsulation layer. 
     The first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ may emit light of different colors. For example, one selected from the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ is to emit blue light, another one selected from the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ is to emit red light, and the remaining one selected from the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ is to emit green light. 
     One selected from the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ may be square, and the other two may be rectangular. 
     Hereinafter, for convenience of description, a case where the first sub-pixel F 1 ′ is square and is to emit red light, the second sub-pixel F 2 ′ is rectangular and is to emit green light, and the third sub-pixel F 3 ′ is rectangular and is to emit blue light will be mainly described in more detail. 
     The first sub-pixel F 1 ′ as described above may include a first intermediate layer  28 - 2 A′, and the first intermediate layer  28 - 2 A′ may correspond to the shape and position of the first sub-pixel F 1 ′. The planar area of the first intermediate layer  28 - 2 A′ may be equal to or greater than the planar area of the first sub-pixel F 1 ′, and the first sub-pixel F 1 ′ may be arranged inside the first intermediate layer  28 - 2 A′ (e.g., may be arranged inside the first intermediate layer  28 - 2 A′ in the plan view). 
     The second sub-pixel F 2 ′ may include a second intermediate layer  28 - 2 B′. In addition, the second intermediate layer  28 - 2 B′ may correspond to the shape and position of the second sub-pixel F 2 ′. The second sub-pixel F 2 ′ may be arranged (e.g., arranged in the plan view) inside the second intermediate layer  28 - 2 B′. 
     The third sub-pixel F 3 ′ may include a third intermediate layer  28 - 2 C′. In addition, the third intermediate layer  28 - 2 C′ may correspond to the shape and position of the third sub-pixel F 3 ′. The third sub-pixel F 3 ′ may be arranged (e.g., arranged in the plan view) inside the third intermediate layer  28 - 2 C′. 
     The planar area of the second sub-pixel F 2 ′ and the planar area of the third sub-pixel F 3 ′ may vary (e.g., may vary relative to each other). 
     In an embodiment, the planar areas of some of a plurality of second sub-pixels F 2 ′ may be different from the planar areas of the other ones of the plurality of second sub-pixels F 2 ′, and the planar areas of some of a plurality of third sub-pixels F 3 ′ may be different from the planar areas of the other ones of the plurality of third sub-pixels F 3 ′. 
     In another embodiment, the planar areas of the plurality of second sub-pixels F 2 ′ may be the same and the planar areas of the plurality of third sub-pixels F 3 ′ may be the same. In this case, the planar area of each of the second sub-pixels F 2 ′ and the planar area of each of the third sub-pixels F 3 ′ may be different from each other. For example, one selected from the planar area of the second sub-pixel F 2 ′ and the planar area of the third sub-pixel F 3 ′ may be less than the other one selected from the planar area of the second sub-pixel F 2 ′ and the planar area of the third sub-pixel F 3 ′. In an embodiment, the planar area of the second sub-pixel F 2 ′ may be less than the planar area of the third sub-pixel F 3 ′. In another embodiment, the planar area of the third sub-pixel F 3 ′ may be less than the planar area of the second sub-pixel F 2 ′. Therefore, it is possible to adjust an aperture ratio of light emitted from each sub-pixel. 
     In this case, the long side of the second sub-pixel F 2 ′ and the long side of the third sub-pixel F 3 ′ may have the same length. However, the length of the short side of the second sub-pixel F 2 ′ and the length of the short side of the third sub-pixel F 3 ′ may be different from each other. 
     As described above, the adjustment of the area of at least one selected from the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ may be achieved by adjusting an area where a pixel-defining layer exposes a pixel electrode. In this case, the areas and shapes of the first intermediate layer  28 - 2 A′, the second intermediate layer  28 - 2 B′, and the third intermediate layer  28 - 2 C′ formed by being respectively deposited on the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ may correspond to the areas and shapes of the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′, respectively, to prevent the sub-pixels from overlapping each other or to reduce the amount of such overlap. 
     A second mask sheet  133 - 2 ′ and a third mask sheet  143 - 2 ′ may be utilized to form the second intermediate layer  28 - 2 B′ and the third intermediate layer  28 - 2 C′ as described above. The second mask sheet  133 - 2 ′ may have a plurality of second openings  133 - 4 ′, and the third mask sheet  143 - 2 ′ may have a plurality of third openings  143 - 4 ′. In this case, the area (e.g., planar area) of each of the second openings  133 - 4  ‘and the area (e.g., planar area) of each of the third openings  143 - 4 ’ may be different from each other. For example, the area of each of the second openings  133 - 4 ′ and the area of each of the third openings  143 - 4 ′ may correspond to the area of the second intermediate layer  28 - 2 B′ and the area of the third intermediate layer  28 - 2 C′, respectively. The relationship between each sub-pixel, each intermediate layer, and each opening as described above may be applicable to one or more other embodiments of the present disclosure. 
     Two second openings  133 - 4 ′ adjacent (e.g., adjacent in a second direction, for example, the Y-axis direction) to each other among the second openings  133 - 4 ′ may be arranged in a state of being tilted in opposite directions with respect to a tensile direction of the second mask sheet  133 - 2 ′. For example, one of the two adjacent second openings  133 - 4 ′ may be tilted away from the tensile direction (e.g., the X-axis direction) in one direction (e.g., one angular direction, for example, a clockwise direction), and the other one of the two adjacent second openings  133 - 4 ′ may be tilted away from the tensile direction in another direction (e.g., another angular direction, for example, a counter-clockwise direction). Furthermore, two third openings  143 - 4 ′ adjacent (e.g., adjacent in the second direction, for example, the Y-axis direction) to each other among the third openings  143 - 4 ′ may be arranged in a state of being tilted in the opposite directions with respect to a tensile direction of the third mask sheet  143 - 2 ′. 
     As described above, even when the second mask sheet  133 - 2 ′ and the third mask sheet  143 - 2 ′ are under tension, shapes of the second openings  133 - 4 ′ and the third openings  143 - 4 ′ are maintained substantially similar to the initial shapes (e.g., their respective initial shapes) and may be moved within a predictable range to some extent when positions of the second openings  133 - 4 ′ and the third opening  143 - 4 ′ are variable in the initial position. Therefore, it is somewhat possible to correct (e.g., it is possible to at least partially correct) a pattern when depositing a second deposition material and a third deposition material on the display substrate in the future. 
     A spacer P′ may be arranged between some sub-pixels of the plurality of sub-pixels. In this case, the spacer P′ is the same as or similar to that described with reference to  FIGS. 1B to 3 , and thus, a more detailed description thereof may not be provided. In addition to the above case, the arrangement of each sub-pixel, a distance from the edge of a sub-pixel to the edge of another sub-pixel(s), a distance from the edge of the spacer P′ to the edge of each sub-pixel, etc. may be the same as those described above with reference to  FIGS. 1B to 3 , and thus, more detailed descriptions thereof may not be provided. 
     The display device may be fixed to a device or the like that is to move a user, such as a vehicle. The display device may be fixed to the device to form a certain angle different from 0 degrees between a user&#39;s viewing direction and the first direction and/or the second direction. For example, the display device may be arranged such that the user&#39;s viewing direction of the display device and the first direction or the second direction form an angle of 90 degrees. 
     In the above case, when a user looks at the display device, an inclined portion of a pixel-defining layer is not perpendicular to the user&#39;s viewing direction. Accordingly, external light may be prevented from being reflected through (e.g., reflected from) the inclined portion of the pixel-defining layer and being incident on the user&#39;s eyes, or the amount of external light reflected through the inclined portion of the pixel-defining layer may be reduced. 
     Further, the display device may implement a precise (e.g., correct or intended) image through each sub-pixel. 
     The display device may be manufactured through a manufacturing apparatus of the display device. The display device manufacturing apparatus may be formed similar to that shown in  FIGS. 4 and 5 . In this case, a second deposition unit may form the first intermediate layer  28 - 2 A′ by utilizing the first mask assembly  123  shown in  FIG. 6 . The second intermediate layer  28 - 2 B′ and the third intermediate layer  28 - 2 C′ may be formed on the display substrate through deposition materials passing through the second opening  133 - 4 ′ and the third opening  143 - 4 ′, respectively, by utilizing the second mask sheet  133 - 2 ′ and the third mask sheet  143 - 2 ′, respectively. 
     According to the display device manufacturing apparatus and the display device manufacturing method, a display device having a precise deposition pattern may be manufactured by reducing the deformation of each mask sheet. 
     Furthermore, according to the display device manufacturing apparatus and the display device manufacturing method, it is possible to reduce an error between a design pattern (e.g., an intended deposition pattern) and an actual deposition pattern that may occur during manufacturing. 
       FIG. 13  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment.  FIG. 14  is a plan view of a portion of a first mask sheet for depositing a first intermediate layer shown in  FIG. 13 .  FIG. 15  is a plan view of a portion of a second mask sheet for depositing a second intermediate layer shown in  FIG. 13 .  FIG. 16  is a plan view of a portion of a third mask sheet for depositing a third intermediate layer shown in  FIG. 13 . 
     Referring to  FIGS. 13 to 16 , a display device may include a display area and a non-display area defined on a substrate, the non-display area being around the display area. A plurality of sub-pixels including a first sub-pixel F 1 ″, a second sub-pixel F 2 ″, and a third sub-pixel F 3 ″ may be arranged in the display area, and a power line may be arranged in the non-display area. In addition, a pad portion may be arranged in the non-display area. The display device may include a display substrate, an intermediate layer arranged in the display area, an opposite electrode, and a thin-film encapsulation layer. The display device is the same as or similar to that described above in  FIG. 3 , and thus, a more detailed description thereof will not be given herein. 
     The first sub-pixel F 1 ″, the second sub-pixel F 2 ″, and the third sub-pixel F 3 ″ may emit light of different colors. For example, one selected from the first sub-pixel F 1 ″, the second sub-pixel F 2 ″, and the third sub-pixel F 3 ″ may emit blue light, another one selected from the first sub-pixel F 1 ″, the second sub-pixel F 2 ″, and the third sub-pixel F 3 ″ may emit red light, and the remaining one selected from the first sub-pixel F 1 ″, the second sub-pixel F 2 ″, and the third sub-pixel F 3 ″ may emit green light. 
     One selected from the first sub-pixel F 1 ″, the second sub-pixel F 2 ″, and the third sub-pixel F 3 ″ may be square, and the other two may be rectangular. 
     Hereinafter, for convenience of description, a case where the first sub-pixel F 1 ″ is square and is to emit red light, the second sub-pixel F 2 ″ is rectangular and is to emit green light, and the third sub-pixel F 3 ″ is rectangular and is to emit blue light will be mainly described in more detail. In this case, the first sub-pixel F 1 ″, the second sub-pixel F 2 ″, and the third sub-pixel F 3 ″ may be similar to those described with reference to  FIGS. 1B to 3 . However, corners of each of the sub-pixels may be chamfered. For example, corner portions of each of the sub-pixels may be rounded or inclined. 
     The first sub-pixel F 1 ″ as described above may be arranged (e.g., arranged in the plan view) inside a first intermediate layer  28 - 2 A″, and the first intermediate layer  28 - 2 A″ may correspond (e.g., correspond in the plan view) to the shape and position of the first sub-pixel F 1 ″. The planar area of the first intermediate layer  28 - 2 A″ may be equal to or greater than the planar area of the first sub-pixel F 1 ″. 
     The second sub-pixel F 2 ″ includes a second intermediate layer  28 - 2 B″. In addition, the second intermediate layer  28 - 2 B″ may correspond (e.g., correspond in the plan view) to the shape and position of the second sub-pixel F 2 ″. The second sub-pixel F 2 ″ may be arranged (e.g., arranged in the plan view) inside the second intermediate layer  28 - 2 B″. 
     The third sub-pixel F 3 ″ includes a third intermediate layer  28 - 2 C″. In addition, the third intermediate layer  28 - 2 C″ may correspond (e.g., correspond in the plan view) to the shape and position of the third sub-pixel F 3 ″. The third sub-pixel F 3 ″ may be arranged (e.g., arranged in the plan view) inside the third intermediate layer  28 - 2 C″. 
     A spacer P″ may be arranged among and/or between the sub-pixels as described above. The spacer P″ is the same as or similar to that described with reference to  FIGS. 1B to 3 , and thus, a more detailed description thereof may not be provided. 
     In order to manufacture the first sub-pixel F 1 ″, the second sub-pixel F 2 ″, and the third sub-pixel F 3 ″ as described above, the display substrate may be supplied to the display device manufacturing apparatus described with reference to  FIGS. 4 and 5 , or to a display device manufacturing apparatus similar to the one described with reference to  FIGS. 4 and 5 . 
     In this case, a first deposition unit may supply a first deposition material to the display substrate to form a first intermediate layer  28 - 2 A″, a second deposition unit may supply a second deposition material to the display substrate to form a second intermediate layer  28 - 2 B″, and a third deposition unit may supply a third deposition material to the display substrate to form a third intermediate layer  28 - 2 C″. For example, the first, second, and third deposition units may respectively correspond to the second, third, and fourth deposition units  120 ,  130 , and  140  of the display device manufacturing apparatus  100  described with reference to  FIG. 4 . 
     In this case, a first mask sheet  123 - 2 ″ utilized in the first deposition unit may have a first opening  123 - 4 ″ formed to correspond to a shape of the first sub-pixel F 1 ″. In this case, the planar area of the first opening  123 - 4 ″ may be equal to or greater than the planar area of a corresponding first sub-pixel F 1 ″. Furthermore, the planar area of the first opening  123 - 4 ″ may be less than the planar area of the first intermediate layer  28 - 2 A″ formed by depositing the first deposition material having passed through the first opening  123 - 4 ″ on the display substrate. A shape of the first opening  123 - 4 ″, a shape of the first intermediate layer  28 - 2 A″, and a shape of the first sub-pixel F 1 ″, which correspond (e.g., mutually correspond) to each other, may be the same and may be square. 
     A second opening  133 - 4 ″ of a second mask sheet  133 - 2 ″ utilized in the second deposition unit may be formed to correspond to a shape of the second sub-pixel F 2 ″. The second opening  133 - 4 ″ may be arranged in the same manner as the arrangement of the second sub-pixel F 2 ″. In this case, the planar area of the second opening  133 - 4 ″ may be equal to or greater than the planar area of the second sub-pixel F 2 ″, and may be less than the planar area of the second intermediate layer  28 - 2 B″ formed by depositing the second deposition material on the display substrate. 
     A third opening  143 - 4 ″ of a third mask sheet  143 - 2 ″ utilized in the third deposition unit is also formed to correspond to the shape of the third sub-pixel F 3 ″, and the planar area of the third opening  143 - 4 ″ may be equal to or greater than the planar area of the third sub-pixel F 3 ″. Furthermore, the planar area of the third opening  143 - 4 ″ may be less than the planar area of the third intermediate layer  28 - 2 C″. 
     In this case, a relationship among the first sub-pixel F 1 ″, the second sub-pixel F 2 ″, and the third sub-pixel F 3 ″ may be similar to those described with reference to  FIGS. 1B to 3 . A relationship among and/or between the first intermediate layer  28 - 2 A″, the second intermediate layer  28 - 2 B″, and the third intermediate layer  28 - 2 C″ may be the same as the relationship among and/or between the first sub-pixel F 1 ″, the second sub-pixel F 2 ″, and the third sub-pixel F 3 ″. 
     For example, the centers of some of the plurality of second sub-pixels F 2 ″ may be on (e.g., arranged with each other on) a straight line in one direction, and the centers of the other ones of the plurality of second sub-pixels F 2 ″ may be arranged with each other in a serpentine (or zigzag) shape in another direction. Furthermore, the centers of some of a plurality of third sub-pixels F 3 ″ may be arranged with each other on a straight line (e.g., a straight line in one direction), and the centers of the other ones of the plurality of third sub-pixels F 3 ″ may be arranged with each other in a serpentine (or zigzag) shape in another direction. The centers of the plurality of first sub-pixels F 1 ″ may be on (e.g., arranged with each other on) a straight line in a direction different from the one direction. In some embodiments, the centers of some of the plurality of first sub-pixels F 1 ″ may be arranged with each other on a straight line in the one direction. 
     In addition, the second sub-pixel F 2 ″ and the third sub-pixel F 3 ″ facing the same first sub-pixel F 1 ″ (e.g., the second sub-pixel F 2 ″ facing one side of the first sub-pixel F 1 ″ and the third sub-pixel F 3 ″ facing another side of the first sub-pixel F 1 ″) may be tilted in opposite directions with respect to a tensile direction of the second mask sheet  133 - 2 ″ and a tensile direction (e.g., X-axis direction) of the third mask sheet  143 - 2 ″. In this case, the second sub-pixels F 2 ″ adjacent (e.g., adjacent in a direction perpendicular to the tensile direction, for example, the Y-axis direction) to each other may form an angle of 45 degrees with respect to the tensile direction of the second mask sheet  133 - 2 ″ in opposite directions, respectively. Also, the second openings  133 - 4 ″ formed in the second mask sheet  133 - 2 ″ and adjacent to each other may form an angle of 45 degrees with respect to the tensile direction of the second mask sheet  133 - 2 ″. The third sub-pixels F 3 ″ adjacent (e.g., adjacent in a direction perpendicular to the tensile direction, for example, the Y-axis direction) to each other may form an angle of 45 degrees with respect to the tensile direction of the third mask sheet  143 - 2 ″ in opposite directions, respectively. Also, the third openings  143 - 4 ″ formed in the third mask sheet  143 - 2 ″ and adjacent to each other may form an angle of 45 degrees with respect to the tensile direction of the third mask sheet  143 - 2 ″. The second intermediate layer  28 - 2 B″ and the third intermediate layer  28 - 2 C″ may be arranged on the display substrate at positions corresponding to the second opening  133 - 4 ″ and the third opening  143 - 4 ″, respectively. 
     The display device may be fixed to a device such as a vehicle that is for moving a user. The display device may be fixed to the device to form an angle different from 0 degrees between a user&#39;s viewing direction and the first direction and/or the second direction. For example, the display device may be arranged so that the user&#39;s viewing direction of the display device and the first direction or the second direction form an angle of 90 degrees. 
     In the above case, when a user looks at the display device, an inclined portion of the pixel-defining layer is not perpendicular to the user&#39;s viewing direction. Accordingly, external light may be prevented from being reflected through (e.g., reflected from) the inclined portion of the pixel-defining layer and being incident on the user&#39;s eyes, or the amount of external light reflected through the inclined portion of the pixel-defining layer may be reduced. 
     Furthermore, the display device may implement a precise image through each sub-pixel. 
     According to the display device manufacturing apparatus and the display device manufacturing method, it is possible to manufacture the display device having an accurate deposition pattern. 
     Furthermore, according to the display device manufacturing apparatus and the display device manufacturing method, it is possible to reduce an error between a design pattern (e.g., an intended deposition pattern) and an actual deposition pattern that may occur during manufacturing, for example, as a result of tension applied to the mask sheets. 
       FIG. 17  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment.  FIG. 18  is a plan view of a portion of a second mask sheet for depositing a second intermediate layer shown in  FIG. 17 .  FIG. 19  is a plan view of a portion of a third mask sheet for depositing a third intermediate layer shown in  FIG. 17 . 
     Referring to  FIGS. 17 to 19 , a display device may include a display area and a non-display area defined on a substrate, the non-display area being around the display area. A plurality of sub-pixels including a first sub-pixel F 1 ′″, a second sub-pixel F 1 ′″, and a third sub-pixel F 3 ′″ may be arranged in the display area, and a power line may be arranged in the non-display area. In addition, a pad portion may be arranged in the non-display area. The display device may include a display substrate, an intermediate layer arranged in the display area, an opposite electrode, and a thin-film encapsulation layer. 
     The first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may emit light of different colors. For example, one selected from the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may emit blue light, another one selected from the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may emit red light, and the remaining one selected from the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may emit green light. 
     One selected from the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may be square, and the other two may be rectangular. 
     Hereinafter, for convenience of description, a case where the first sub-pixel F 1 ′″ is square and is to emit red light, the second sub-pixel F 2 ′″ is rectangular and is to emit green light, and the third sub-pixel F 3 ′″ is rectangular and is to emit blue light will be mainly described in more detail. 
     The first sub-pixel F 1 ′″ as described above may include a first intermediate layer  28 - 2 A′″, and the first intermediate layer  28 - 2 A′″ may correspond to the shape and position of the first sub-pixel F 1 ′″. The planar area of the first intermediate layer  28 - 2 A′″ may be greater than the planar area of the first sub-pixel F 1 ′″, and the first sub-pixel F 1 ′″ may be arranged inside the first intermediate layer  28 - 2 A′″. 
     The second sub-pixel F 2 ′″ may include a second intermediate layer  28 - 2 B′″. In addition, the second intermediate layer  28 - 2 B′″ may correspond to the shape and position of the second sub-pixel F 1 ′″. The second sub-pixel F 2 ′″ may be arranged inside the second intermediate layer  28 - 2 B′″. 
     The third sub-pixel F 3 ′″ may include a third intermediate layer  28 - 2 C′″. In addition, the third intermediate layer  28 - 2 C′″ may correspond to the shape and position of the third sub-pixel F 3 ′″. The third sub-pixel F 3 ′″ may be arranged inside the third intermediate layer  28 - 2 C′″. 
     The first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may be applied to the structures shown in  FIGS. 1B to 3  in the same or similar manner, and may be arranged with each other the same as or similar to those described with reference to  FIGS. 1B to 3 . 
     At least one selected from the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may have a chamfered edge (e.g., corner or vertex). For example, in an embodiment, one selected from a vertex of the first sub-pixel F 1 ′″, a vertex of the second sub-pixel F 1 ′″, and a vertex of the third sub-pixel F 3 ′″ may be chamfered, and the remaining two of them are not chamfered. In another embodiment, two selected from the vertex of the first sub-pixel F 1 ′″, the vertex of the second sub-pixel F 1 ′″, and the vertex of the third sub-pixel F 3 ′″ may be chamfered, and the remaining one of them may not be chamfered. In another embodiment, all of the vertex of the first sub-pixel F 1 ′″, the vertex of the second sub-pixel F 1 ′″, and the vertex of the third sub-pixel F 3 ′″ may be chamfered. Hereinafter, for convenience of description, a case where all of the vertex of the first sub-pixel F 1 ′″, the vertex of the second sub-pixel F 1 ′″, and the vertex of the third sub-pixel F 3 ′″ are chamfered will be mainly described in more detail. 
     In order to form the vertex of the first sub-pixel F 1 ′″, the vertex of the second sub-pixel F 1 ′″, and the vertex of the third sub-pixel F 3 ′″ that are chamfered as described above, a vertex (or corner) of a first opening of a first mask sheet, a vertex (or corner) of a second opening  133 - 4 ′″ of a second mask sheet  133 - 2 ′″, and a vertex (or corner) of a third opening  143 - 4 ′″ of a third mask sheet  143 - 2 ′″ may be chamfered. In this case, each of the first opening, the second opening  133 - 4 ′″, and the third opening  143 - 4 ′″ may be the same as or similar to an octagonal shape. For example, chamfered portions in the first opening, the second opening  133 - 4 ′″, and the third opening  143 - 4 ′″ may be rounded. The first opening may be formed as shown in  FIG. 14 , and the second opening  133 - 4 ′″ and the third opening  143 - 4 ′″ may be inclined as shown in  FIGS. 18 and 19 . 
     When the vertex of the first opening, the vertex of the second opening  133 - 4 ′″, and the vertex of the third opening  143 - 4 ′″ are chamfered as described above, stress may not be concentrated on the vertex of the first opening, the vertex of the second opening  133 - 4 ′″, and the vertex of the third opening  143 - 4 ′″ when the first mask sheet, the second mask sheet  133 - 2 ′″, and the third mask sheet  143 - 2 ′″ are respectively under tension. Therefore, when the first mask sheet, the second mask sheet  133 - 2 ′″, and the third mask sheet  143 - 2 ′″ are respectively under tension, damage to the first mask sheet, the second mask sheet  133 - 2 ′″, and the third mask sheet  143 - 2 ′″ may be prevented or reduced. In addition, because a first deposition material, a second deposition material, and a third deposition material are not deposited and do not clog at the vertex of the first opening, the vertex of the second opening  133 - 4 ′″, and the vertex of the third opening  143 - 4 ′″, the first intermediate layer  28 - 2 A′″, the second intermediate layer  28 - 2 B′″, and the third intermediate layer  28 - 2 C′″ having correct shapes may be formed. 
     The display device may be manufactured through a display device manufacturing apparatus of the same or similar type (e.g., kind) as the display device manufacturing apparatus shown in  FIGS. 4 and 5  described above. 
     In this case, a first deposition unit may supply a first deposition material to the display substrate to form the first intermediate layer  28 - 2 A′″, a second deposition unit may supply a second deposition material to the display substrate to form the second intermediate layer  28 - 2 B′″, and a third deposition unit may supply a third deposition material to the display substrate to form the third intermediate layer  28 - 2 C′″. 
     In this case, the first mask sheet utilized in the first deposition unit may have the first opening formed to correspond to the shape of the first sub-pixel F 1 ′″. In this case, the planar area of the first opening may be equal to or greater than the planar area of a corresponding first sub-pixel F 1 ′″. Also, the planar area of the first opening may be equal to or greater than the planar area of the corresponding first intermediate layer  28 - 2 A′″ formed by depositing the first deposition material having passed through the first opening on the display substrate. A shape of the first opening, a shape of the first intermediate layer  28 - 2 A′″, and a shape of the first sub-pixel F 1 ′″, which correspond to each other, may be the same and may be square. 
     A second opening  133 - 4 ′″ of a second mask sheet  133 - 2 ′″ utilized in the second deposition unit may be formed to correspond to the shape of the second sub-pixel F 1 ′″. The second openings  133 - 4 ′″ may be arranged in the same manner as the arrangement of the second sub-pixels F 1 ′″. In this case, the planar area of the second opening  133 - 4 ′″ may be equal to or greater than the planar area of the second sub-pixel F 1 ′″, and may be equal to or greater than the planar area of the second intermediate layer  28 - 2 B′″ formed by depositing the second deposition material on the display substrate. 
     A third opening  143 - 4 ′″ of a third mask sheet  143 - 2 ′″ utilized in the third deposition unit is also formed to correspond to the shape of the third sub-pixel F 3 ′″, and the planar area of the third opening  143 - 4 ′″ may be equal to or greater than the planar area of the third sub-pixel F 3 ′″. Furthermore, the planar area of the third opening  143 - 4 ′″ may be equal to or greater than the planar area of the third intermediate layer  28 - 2 C′″. 
     In this case, the first sub-pixel F 1 ′″, the second sub-pixel F 2 ′″ and the third sub-pixel F 3 ′″ may be similar to those described with reference to  FIG. 1B  to  FIG. 3 . A relationship among and/or between the first intermediate layer  28 - 2 A′″, the second intermediate layer  28 - 2 B′″, and the third intermediate layer  28 - 2 C′″ may be the same as the relationship among and/or between the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″. 
     For example, the centers of some of a plurality of second sub-pixels F 2 ′″ may be arranged with each other on a straight line in one direction, and the centers of the other ones of the plurality of second sub-pixels F 2 ′″ may be arranged with each other in a serpentine (or zigzag) shape in another direction. Furthermore, the centers of a portion of a plurality of third sub-pixels F 3 ′″ may be arranged with each other on a straight line, and the centers of another portion of the plurality of third sub-pixels F 3 ′″ may be arranged with each other in a serpentine (or zigzag) shape in another direction. The centers of a plurality of first sub-pixels F 1 ′″ may be on (e.g., arranged with each other on) a straight line in a direction different from the one direction. In some embodiments, the centers of some of a plurality of first sub-pixels F 1 ′″ may be arranged with each other on a straight line in the one direction. 
     In addition, the second sub-pixel F 2 ′″ and the third sub-pixel F 3 ′″ facing the same first sub-pixel F 1 ′″ (e.g., the second sub-pixel F 2 ′″ facing one side of the first sub-pixel F 1 ″′ and the third sub-pixel F 3 ′″ facing another side of the first sub-pixel F 1 ″′) may be tilted in opposite directions with respect to a tensile direction of the second mask sheet  133 - 2 ′″ and a tensile direction of the third mask sheet  143 - 2 ′″. In this case, the second sub-pixels F 2 ′″ adjacent to each other may form an angle of 45 degrees with respect to the tensile direction of the second mask sheet  133 - 2 ′″ in opposite directions, respectively. Also, the second openings  133 - 4 ′″ formed in the second mask sheet  133 - 2 ′″ and adjacent to each other may form an angle of 45 degrees with respect to the tensile direction of the second mask sheet  133 - 2 ′″. The third sub-pixels F 3 ′″ adjacent to each other may form an angle of 45 degrees with respect to the tensile direction of the third mask sheet  143 - 2 ′″ in opposite directions, respectively. Also, the third openings  143 - 4 ′″ formed in the third mask sheet  143 - 2 ′″ and adjacent to each other may form an angle of 45 degrees with respect to the tensile direction of the third mask sheet  143 - 2 ′″. The second intermediate layer  28 - 2 B′″ and the third intermediate layer  28 - 2 C′″ may be arranged on the display substrate at positions corresponding to the second opening  133 - 4 ′″ and the third opening  143 - 4 ′″, respectively. 
     The display device may be fixed to a device or the like for moving a user, such as a vehicle. The display device may be fixed to the device to form a certain angle different from 0 degrees between a user&#39;s viewing direction and the first direction and/or the second direction. For example, the display device may be arranged such that the user&#39;s viewing direction of the display device and the first direction or the second direction form an angle of 90 degrees. 
     In the above case, when a user looks at the display device, an inclined portion of the pixel-defining layer is not perpendicular to the user&#39;s viewing direction. Accordingly, external light may be prevented from being reflected through (e.g., reflected from) the inclined portion of the pixel-defining layer and incident on the user&#39;s eyes, or the amount of external light reflected through the inclined portion of the pixel-defining layer may be reduced. 
     Further, the display device may implement a precise image through each sub-pixel. 
     According to the display device manufacturing apparatus and the display device manufacturing method, it is possible to manufacture the display device having an accurate deposition pattern. 
     Furthermore, according to the display device manufacturing apparatus and the display device manufacturing method, it is possible to reduce an error between a design pattern and an actual deposition pattern that may occur during manufacturing. 
     The shape in which corner portions of the sub-pixels F 1 ′″, F 2 ′″ and F 3 ′″ shown in  FIG. 17  are chamfered is not limited to that shown  FIG. 17  and may be applied to other embodiments described herein. 
       FIG. 20  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 20 , the display device may include a plurality of sub-pixels arranged with each other in a display area. The plurality of sub-pixels may be arranged with each other to be spaced apart from each other by a certain interval in the display area. In this case, the display area may be divided into a plurality of virtual areas, each having a certain planar area. For example, the display area may include pixel areas AR having the same area. Each of the pixel areas AR may include one or more of the plurality of sub-pixels or may include parts of one or more of the plurality of sub-pixels. 
     The plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit blue light, another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit red light, and the remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit green light. In this case, depending on the shape of each of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , one selected from the blue light, the red light, and the green light may be square, and the other two selected from the blue light, the red light, and the green light may be rectangular. Hereinafter, for convenience of description, a case where the first sub-pixel F 1  is to emit blue light, the second sub-pixel F 2  is to emit red light, and the third sub-pixel F 3  is to emit green light will be mainly described in more detail. 
     The area of each of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may vary. In this case, because an aperture ratio of each of the sub-pixels may be adjusted, the display device  20  may be realized to perform various suitable operations in various suitable forms. 
     The first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may include a first intermediate layer  28 - 2 A, a second intermediate layer  28 - 2 B, and a third intermediate layer  28 - 2 C, respectively. In this case, the first intermediate layer  28 - 2 A, the second intermediate layer  28 - 2 B, and the third intermediate layer  28 - 2 C may include (e.g., be) materials (e.g., organic emission layers) that are to emit different pieces of light (e.g., light of different colors) when external power is applied thereto. 
     The first intermediate layer  28 - 2 A, the second intermediate layer  28 - 2 B, and the third intermediate layer  28 - 2 C may correspond to the shapes of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , respectively. In this case, the planar area of each of the intermediate layers may be the same as or different from the planar area of a respective one of the sub-pixels. For example, in an embodiment, the planar area of the first intermediate layer  28 - 2 A may be different from the planar area of the first sub-pixel F 1 , the planar area of the second intermediate layer  28 - 2 B may be the same as the planar area of the second sub-pixel F 2 , and the planar area of the third intermediate layer  28 - 2 C may be the same as the planar area of the third sub-pixel F 3 . In another embodiment, the planar area of the second intermediate layer  28 - 2 B may be different from the planar area of the second sub-pixel F 2 , the planar area of the first intermediate layer  28 - 2 A may be the same as the planar area of the first sub-pixel F 1 , and the planar area of the third intermediate layer  28 - 2 C may be the same as the planar area of the third sub-pixel F 3 . In another embodiment, the planar area of the third intermediate layer  28 - 2 C may be different from the planar area of the third sub-pixel F 3 , the planar area of the second intermediate layer  28 - 2 B may be the same as the planar area of the second sub-pixel F 2 , and the planar area of the first intermediate layer  28 - 2 A may be the same as the planar area of the first sub-pixel F 1 . In another embodiment, the planar area of the first intermediate layer  28 - 2 A may be the same as the planar area of the first sub-pixel F 1 , the planar area of the second intermediate layer  28 - 2 B may be different from the planar area of the second sub-pixel F 2 , and the planar area of the third intermediate layer  28 - 2 C may be different from the planar area of the third sub-pixel F 3 . In another embodiment, the planar area of the second intermediate layer  28 - 2 B may be the same as the planar area of the second sub-pixel F 2 , the planar area of the first intermediate layer  28 - 2 A may be different from the planar area of the first sub-pixel F 1 , and the planar area of the third intermediate layer  28 - 2 C may be different from the planar area of the third sub-pixel F 3 . In another embodiment, the planar area of the third intermediate layer  28 - 2 C may be the same as the planar area of the third sub-pixel F 3 , the planar area of the first intermediate layer  28 - 2 A may be different from the planar area of the first sub-pixel F 1 , and the planar area of the second intermediate layer  28 - 2 B may be different from the planar area of the second sub-pixel F 2 . In another embodiment, the planar area of the first intermediate layer  28 - 2 A may be different from the planar area of the first sub-pixel F 1 , the planar area of the second intermediate layer  28 - 2 B may be different from the planar area of the second sub-pixel F 2 , and the planar area of the third intermediate layer  28 - 2 C may be different from the planar area of the third sub-pixel F 3 . In another embodiment, the planar area of the first intermediate layer  28 - 2 A may be the same as the planar area of the first sub-pixel F 1 , the planar area of the second intermediate layer  28 - 2 B may be the same as the planar area of the second sub-pixel F 2 , and the planar area of the third intermediate layer  28 - 2 C may be the same as the planar area of the third sub-pixel F 3 . Here, the planar area may be an area on a plane formed by the display area DA of the display device  20 . In some embodiments, the planar area may be an area on a plane on which an image is to be implemented (e.g., displayed) when the image is implemented (e.g., generated). In some embodiments, the planar area may be an area of components (e.g. intermediate layers and sub-pixels) when viewed in a plan view. Hereinafter, for convenience of description, a case where the planar area of each intermediate layer is different from the planar area of each sub-pixel will be mainly described in more detail. 
     For example, the planar area of each sub-pixel may be less than the planar area of each intermediate layer. For example, the planar shape of each sub-pixel may be arranged (e.g., arranged in the plan view) inside the planar shape of each intermediate layer. In this case, the planar shape of each sub-pixel may correspond to the planar shape of a respective opening OP of a pixel-defining layer  29 . In this case, each intermediate layer is formed on the display substrate D to completely cover each opening OP of the pixel-defining layer  29  while having a sufficient margin, and thus, each sub-pixel may emit light having an accurate shape. 
     Because a relationship between the sub-pixels and a relationship between the intermediate layers are the same or similar to each other, the following description will be made mainly on the relationship between the sub-pixels for convenience of description. 
     A plurality of first sub-pixels F 1 , a plurality of second sub-pixels F 2 , and a plurality of third sub-pixels F 3  may be provided. In this case, one side of at least one selected from the first to third sub-pixels F 1 , F 2 , and F 3  may be protruding or retracted (e.g., recessed, indented, etc.). Also, one side of at least one selected from the first to third sub-pixels F 1 , F 2 , and F 3  may be curved. 
     When one side of at least one selected from the first to third sub-pixels F 1 , F 2 , and F 3  is curved, the planar area of each sub-pixel may be increased as compared to when all sides of the first to third sub-pixels F 1 , F 2 , and F 3  are straight. In addition, because the inner wall of the opening of the pixel-defining layer defining each sub-pixel has a curved shape, external light impinging on (e.g., incident on) the inner wall of the opening of the pixel-defining layer may be dispersed. 
     The plurality of first sub-pixels F 1  may be spaced apart from each other in at least one selected from a first direction and a second direction. For example, some of the plurality of first sub-pixels F 1  may be arranged with each other to be spaced apart from each other in a first direction (e.g., one selected from an X-axis direction and a Y-axis direction in  FIG. 1B ), and the other ones of the plurality of first sub-pixels F 1  may be arranged with each other to be spaced apart from each other in a second direction (e.g., the other one selected from the X-axis direction and the Y-axis direction in  FIG. 1B ). In this case, the centers of first sub-pixels F 1  arranged with each other in the first direction from among the plurality of first sub-pixels F 1  may be arranged with each other on one straight line. In addition, the centers of first sub-pixels F 1  arranged with each other in the second direction from among the plurality of first sub-pixels F 1  may be arranged with each other on one straight line or in a serpentine (or zigzag) shape. 
     The planar area of each of the plurality of first sub-pixels F 1  may have a shape similar to a quadrangle. For example, the planar area of the first sub-pixel F 1  may include four vertexes. In this case, one side of the first sub-pixel F 1  connecting adjacent vertices may be curved as described above and may protrude to the outside of the first sub-pixel F 1  (e.g., away from the center of the first sub-pixel F 1 ) or be retracted to the inside of the first sub-pixel F 1  (e.g., toward the center of the first sub-pixel F 1 ). 
     The first sub-pixels F 1  as described above may be arranged tilted with respect to a user&#39;s viewing direction shown in  FIG. 1A . For example, a straight line (e.g., a virtual straight line) connecting adjacent vertices among the vertices of the first sub-pixel F 1  may be arranged in a diagonal direction with respect to the user&#39;s viewing direction of  FIG. 1A . 
     The first sub-pixel F 1  may have a first side S 1 , a second side S 2 , a third side S 3 , and a fourth side S 4 . In this case, at least one selected from the first side S 1 , the second side S 2 , the third side S 3 , and the fourth side S 4  may be convex or concave, and may be curved. In another embodiment, at least one selected from the first side S 1 , the second side S 2 , the third side S 3 , and the fourth side S 4  may have a linear form. For example, one or more selected from the first side S 1 , the second side S 2 , the third side S 3 , and the fourth side S 4  may be curved with a convex or concave shape, and the others selected from the first side S 1 , the second side S 2 , the third side S 3 , and the fourth side S 4  may have a linear form. Hereinafter, for convenience of description, a case where the first side S 1 , the second side S 2 , the third side S 3 , and the fourth side S 4  all have curved shapes will be mainly described in more detail. A case where the first side S 1  and the second side S 2  have convex curved shapes and the third side S 3  and the fourth side S 4  have concave curved shapes will be mainly described in more detail. In some embodiments, the first side S 1  and the second side S 2  may share a common vertex, and the third side S 3  and the fourth side S 4  may share a common vertex. 
     The first sub-pixels F 1  may be arranged to have the same shape in the first direction. For example, first sub-pixels F 1  arranged with each other along a straight line in the first direction may each have the same shape. On the other hand, the first sub-pixels F 1  may be arranged to have alternating shapes inverted in the second direction. For example, first sub-pixels F 1  arranged with each other in the second direction may each have a shape that is the same as a shape of an adjacent one of the first sub-pixels F 1  along the second direction after having been inverted with respect to a line extending along the second direction and through the center of the adjacent first sub-pixel F 1 . For example, the first sub-pixels F 1  arranged with each other in the X-axis direction in  FIG. 20  may be arranged to have the same shape, and thus, one side of each first sub-pixel F 1  may be arranged in the same position. On the other hand, one of the first sub-pixels F 1  arranged in the Y-axis direction and adjacent to another one of the first sub-pixels F 1  in the Y-axis direction may have a shape in which the top and bottom of the adjacent other one of the first sub-pixels F 1  are inverted as in  FIG. 20 . For example, the first and second sides S 1  and S 2  of one of the first sub-pixels F 1  adjacent to another one of the first sub-pixels F 1  in the Y-axis direction may be arranged at the lower side of  FIG. 20 , and the first and second sides S 1  and S 2  of the adjacent other one of the first sub-pixels F 1  may be arranged at the upper side of  FIG. 20 . 
     One second sub-pixel F 2  and one third sub-pixel F 3  may be arranged on the first side S 1  or the second side S 2  of one first sub-pixel F 1  to face the first sub-pixel F 1 . In this case, the second sub-pixel F 2  and the third sub-pixel F 3  may be arranged to be tilted with respect to one selected from the first direction and the second direction. 
     The second sub-pixel F 2  and the third sub-pixel F 3  may have rectangular shapes. In this case, the area of at least one selected from the second sub-pixel F 2  and the third sub-pixel F 3  may be less than the area of the first sub-pixel F 1 . Furthermore, at least one selected from the second sub-pixel F 2  and the third sub-pixel F 3  facing the first sub-pixel F 1  may be arranged to overlap one side (e.g., the first side S 1  or the second side S 2 ) of the first sub-pixel F 1  facing the second sub-pixel F 2  and the third sub-pixel F 3  and/or an extension line of the one side of the first sub-pixel F 1 . For example, at least a portion of the second sub-pixel F 2  and at least a portion of the third sub-pixel F 3  adjacent to each other may be arranged within a length range of one selected from the first side S 1  and the second side S 2 . 
     For example, in an embodiment, extension lines of short sides of different second sub-pixels F 2  respectively facing the first side S 1  and the second side S 2  may intersect or cross with each other, or extension lines of long sides of the second sub-pixels F 2  respectively facing the first side S 1  and the second side S 2  may intersect or cross with each other. In another embodiment, extension lines of short sides of a plurality of third sub-pixels F 3  respectively facing the first side S 1  and the second side S 2  may intersect or cross with each other, or extension lines of long sides of the third sub-pixels F 3  respectively facing the first side S 1  and the second side S 2  may intersect or cross with each other. In another embodiment, the extension line of a short side of the second sub-pixel F 2  facing the first side S 1  and the extension line of a short side of the third sub-pixel F 3  facing the second side S 2  may intersect or cross with each other, or the extension line of a long side of the second sub-pixel F 2  facing the first side S 1  and the extension line of a long side of the third sub-pixel F 3  facing the second side S 2  may intersect or cross with each other. In another embodiment, the extension line of a long side of the second sub-pixel F 2  facing the first side S 1  and the extension line of a short side of the third sub-pixel F 3  facing the second side S 2  may intersect or cross with each other, or the extension line of a short side of the second sub-pixel F 2  facing the first side S 1  and the extension line of a long side of the third sub-pixel F 3  facing the second side S 2  may intersect or cross with each other. 
     The plurality of second sub-pixels F 2  may be spaced apart from each other in at least one selected from the first direction and the second direction. In another embodiment, the centers of some of a plurality of second sub-pixels F 2  arranged with each other in the first direction or the second direction may be arranged on a straight line. In another embodiment, the centers of some of a plurality of second sub-pixels F 2  arranged with each other in one selected from the first direction and the second direction may be arranged on a straight line, and the centers of the others of the plurality of second sub-pixels F 2  arranged with each other in the other one selected from the first direction and the second direction may be arranged with each other in a serpentine (or zigzag) shape in the other one selected from the first direction and the second direction. Hereinafter, for convenience of description, a case where the centers of some of a plurality of second sub-pixels F 2  arranged with each other in the first direction are arranged with each other on a straight line and the centers of the others of the plurality of second sub-pixels F 2  arranged with each other in the second direction are arranged with each other in a serpentine (or zigzag) shape will be mainly described in more detail. 
     In the above case, four second sub-pixels F 2  may be arranged around one first sub-pixel F 1 . In this case, three second sub-pixels F 2  may be arranged at positions rotated by the same angle with respect to the center of the first sub-pixel F 1 , with respect to one second sub-pixel F 2 . In this case, short sides of two of the four second sub-pixels F 2  facing the one first sub-pixel F 1  may respectively face the first side S 1  and the second side S 2  of the one first sub-pixel F 1 , and long sides of the remaining two of the four second sub-pixels F 2  facing the one first sub-pixel F 1  may respectively face the third side S 3  and the fourth side S 4  of the one first sub-pixel F 1 . 
     The plurality of third sub-pixels F 3  may also be arranged with each other to be spaced apart from each other in at least one selected from the first direction and the second direction similarly to the second sub-pixels F 2 . In this case, the plurality of third sub-pixels F 3  may also be arranged similarly to the second sub-pixels F 2 . Hereinafter, for convenience of description, a case where the centers of some of a plurality of third sub-pixels F 3  arranged with each other in the first direction from among the plurality of third sub-pixels F 3  are arranged with each other on a straight line and the centers of the other ones of the plurality of third sub-pixels F 3  arranged with each other in the second direction from among the plurality of third sub-pixels F 3  are arranged with each other in a serpentine (or zigzag) shape will be mainly described in more detail. 
     In this case, one selected from the second sub-pixel F 2  and the third sub-pixel F 3  facing the first side S 1  of the first sub-pixel F 1  may be arranged to be symmetrical with one selected from the second sub-pixel F 2  and the third sub-pixel F 3  facing the second side S 2  of the first sub-pixel F 1  with respect to a straight line (e.g., a straight line parallel to the first direction while passing through the centers of two adjacent first sub-pixels F 1 ) connecting the centers of first sub-pixels F 1  arranged in the first direction. For example, the second sub-pixel F 2  facing the first side S 1  may be symmetrical with the third sub-pixel F 3  facing the second side S 2  with respect to the straight line. Also, the third sub-pixel F 3  facing the first side S 1  may be symmetrical with the second sub-pixel F 2  facing the second side S 2  with respect to the straight line. A distance between the centers of adjacent second sub-pixels F 2  may be the same as a distance between the centers of adjacent third sub-pixels F 3 . In another embodiment, the second sub-pixel F 2  and the third sub-pixel F 3  facing the first side S 1  may be symmetrical with the second sub-pixel F 2  and the third sub-pixel F 3  facing the second side S 2 , respectively. A distance between the centers of one selected from a pair of second sub-pixels F 2  and a pair of third sub-pixels F 3  arranged symmetrically with respect to each other may be less than a distance between the centers of the other one selected from the pair of second sub-pixels F 2  and the pair of third sub-pixels F 3  arranged symmetrically with respect to each other. In this case, a pair of second sub-pixels F 2  adjacent to each other may be arranged between a pair of third sub-pixels F 3  adjacent to each other or the pair of third sub-pixels F 3  adjacent to each other may be arranged between the pair of second sub-pixels F 2  adjacent to each other. However, hereinafter, for convenience of description, a case where the second sub-pixel F 2  is arranged to be symmetrical with the third sub-pixel F 3  with respect to a straight line connecting the centers of first sub-pixels F 1  arranged in the first direction will be mainly described in more detail. 
     One side of at least one selected from the second sub-pixel F 2  and the third sub-pixel F 3  may be concave or convex. In this case, a concave or convex side of the at least one selected from the second sub-pixel F 2  and the third sub-pixel F 3  may have a curved shape. Hereinafter, for convenience of description, a case where one side of the second sub-pixel F 2  and one side of the third sub-pixel F 3  each have a convex curve will be described in more detail. 
     In the above case, the second sub-pixel F 2  and the third sub-pixel F 3  adjacent to each other may have convex shapes in opposite directions. The second sub-pixel F 2  may have a fifth side S 5 , a sixth side S 6 , a seventh side S 7 , and an eighth side S 8 . In this case, the length of the sixth side S 6  and the length of the eighth side S 8  may each be greater than each of the length of the fifth side S 5  and the length of the seventh side S 7 . The sixth side S 6  and the eighth side S 8  may form long sides, and the fifth side S 5  and the seventh side S 7  may form short sides. Also, the third sub-pixel F 3  may have a ninth side S 9 , a tenth side S 10 , an eleventh side S 11 , and a twelfth side S 12 . In this case, the length of the tenth side S 10  and the length of the eleventh side S 11  may each be less than each of the length of the ninth side S 9  and the length of the twelfth side S 12 . The tenth side S 10  and the eleventh side S 11  may form short sides, and the ninth side S 9  and the twelfth side S 12  may form long sides. In this case, the eighth side S 8  and the ninth side S 9  facing each other may be parallel to each other and may each have a linear shape. In addition, the fifth side S 5 , the seventh side S 7 , the tenth side S 10 , and the eleventh side S 11  may each have a linear shape. On the other hand, the sixth side S 6  facing oppositely away from the eighth side S 8  and the twelfth side S 12  facing oppositely away from the ninth side S 9  may each have a convex curved shape. In this case, the sixth side S 6  and the twelfth side S 12  may be parts of a circle or parts of a curve. In this case, a first distance Ld 1  between the sixth side S 6  and the fourth side S 4  may be constant along a length direction of the sixth side S 6  and along a length direction of the fourth side S 4 . For example, the shortest distance from any point of the sixth side S 6  to the fourth side S 4  may be the same for multiple or all measurements along the sixth side S 6 . In addition, a second distance Ld 2  between the twelfth side S 12  and the third side S 3  may also be the same along a length direction of the twelfth side S 12  and along a length direction of the third side S 3 . 
     In the above case, a spacer P may be arranged between the first sub-pixel F 1  and the second sub-pixel F 2  adjacent to each other, between the first sub-pixel F 1  and the third sub-pixel F 3  adjacent to each other, and/or between the second sub-pixel F 2  and the third sub-pixel F 3  adjacent to each other. In this case, one side of the planar shape of the spacer P may be formed to correspond to the shape of one side of the planar shape of each sub-pixel facing the one side of the planar shape of the spacer P. For example, when the shape of one side of the planar shape of each sub-pixel facing the one side of the planar shape of the spacer P is a straight line, the one side of the planar shape of the spacer P may be straight, and when the shape of one side of the planar shape of each sub-pixel facing the one side of the planar shape of the spacer P is a curve, the one side of the planar shape of the spacer P may be curved. For example, in  FIG. 20 , the spacer P may be arranged between the first sub-pixel F 1  and the long side of the third sub-pixel F 3 , between the first sub-pixel F 1  and the long side of the second sub-pixel F 2 , between the long side of the second sub-pixel F 2  and the long side of the third sub-pixel F 3 , or between the first sub-pixel F 1  and the short side of the second sub-pixel F 2 . In this case, when the spacer P is arranged between the first side S 1  and the seventh side S 7 , and between the first side S 1  and the eleventh side S 11 , the shape of one side of the spacer P facing the first side S 1  may be a concave curve, and the shape of the other side of the spacer P facing the seventh side S 7  and the eleventh side S 11  may be a straight line. In addition, when the spacer P is arranged between the fourth side S 4  and the sixth side S 6 , the shape of one side of the spacer P facing the fourth side S 4  may be a convex curve, and the shape of one side of the spacer P facing the sixth side S 6  may be a concave curve. When the spacer P is arranged between the third side S 3  and the twelfth side S 12 , the shape of one side of the spacer P facing the third side S 3  may be a convex curve, and the shape of one side of the spacer P facing the twelfth side S 12  may be a concave curve. When the spacer P is arranged between the eighth side S 8  and the ninth side S 9 , the shapes of all sides of the spacer P may be straight lines. In the above case, one side of the planar shape of the spacer P may maintain a constant distance from one side of the planar shape of each of the sub-pixels facing each other (e.g., of the respective sub-pixel having a side facing the one side of the planar shape of the spacer P). For example, the distance from one side of the planar shape of the spacer P to one side of the planar shape of each sub-pixel (e.g., of the respective sub-pixel) facing one side of the planar shape of the spacer P may have a constant value in a length direction of one side of each sub-pixel (e.g., of the respective sub-pixel). For example, as described above, a space in which the spacer P may be arranged may be provided by maintaining the first and second distances Ld 1  and Ld 2  constant. 
     Because at least one side of each sub-pixel has a curved shape as described above, reflection of light incident on the display device from above may be reduced. When external light is incident on the display device, the external light may be reflected from the inner wall of an opening of a pixel-defining layer formed in a thickness direction of the display device and enter a user&#39;s eyes. 
     However, external light may be reflected in various directions by forming at least one side of each sub-pixel in a curved shape as described above. For example, external light may be effectively dispersed by forming the opening of the pixel-defining layer to have the same planar shape as that of a respective sub-pixel. 
     The first intermediate layer  28 - 2 A, the second intermediate layer  28 - 2 B, and the third intermediate layer  28 - 2 C respectively forming (e.g., corresponding to) the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , respectively, may be formed and arranged to be the same as or similar to the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , respectively. The centers of the first intermediate layer  28 - 2 A, the second intermediate layer  28 - 2 B, and the third intermediate layer  28 - 2 C may be arranged at positions that are the same as or different from those of the centers of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , respectively. The descriptions of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  given above may be applied to the first intermediate layer  28 - 2 A, the second intermediate layer  28 - 2 B, and the third intermediate layer  28 - 2 C, respectively. 
       FIG. 21  is a plan view of a portion of a first mask sheet for depositing a first intermediate layer shown in  FIG. 20 . 
     Referring to  FIG. 21 , a first mask sheet  123 - 2  may be arranged on a first mask frame, as shown in  FIGS. 5 to 6 . The first mask sheet  123 - 2  may number two or more (e.g., may be provided in plurality). The plurality of first mask sheets  123 - 2  may be arranged in a line to be adjacent to each other in the first direction or the second direction. For example, in this case, a long side of the first mask sheet  123 - 2  may be arranged to be parallel to a long side or a short side of the first mask frame. 
     The first mask sheet  123 - 2  may have a plurality of first openings  123 - 4 . The plurality of first openings  123 - 4  may be arranged with each other to be spaced apart from each other in the first direction and the second direction. For example, each of the first openings  123 - 4  may have a shape similar to a rhombus with a vertex arranged in a tensile direction of the first mask sheet  123 - 2 . Each of these first openings  123 - 4  may be formed to correspond to the shape of the first sub-pixel F 1  described with reference to  FIG. 20 . For example, at least one side of the planar shape of the first opening  123 - 4  may be concave or convex and may be curved. 
     The centers of some of the plurality of first openings  123 - 4  may be arranged with each other on a line in one selected from the tensile direction of the first mask sheet  123 - 2  and a direction perpendicular or normal to the tensile direction of the first mask sheet  123 - 2 . In addition, the centers of the other ones of the plurality of first openings  123 - 4  may be arranged with each other in a serpentine (or zigzag) shape in one (e.g., the other one) selected from the tensile direction of the first mask sheet  123 - 2  and a direction perpendicular to the tensile direction of the first mask sheet  123 - 2 . In the case where the first opening  123 - 4  is formed as described above, even if the first mask sheet  123 - 2  is under tension, a tensile shape of the first mask sheet  123 - 2  may be predicted to some extent. 
       FIG. 22  is a plan view of a portion of a second mask sheet for depositing a second intermediate layer shown in  FIG. 20 . 
     Referring to  FIG. 22 , a second mask sheet  133 - 2  may be similar to the first mask sheet  123 - 2 . In this case, the second mask sheet  133 - 2  may have a plurality of second openings  133 - 4 . The plurality of second openings  133 - 4  may be spaced apart from each other. Some of the plurality of second openings  133 - 4  may be tilted in one direction with respect to a tensile direction (e.g., the X-axis direction in  FIG. 22 ) of the second mask sheet  133 - 2 . The other ones of the plurality of second openings  133 - 4  may be tilted in a direction different from the direction of the tilt of the some of the plurality of second openings  133 - 4  with respect to the tensile direction of the second mask sheet  133 - 2 . In this case, a distance (e.g., a minimum distance) between two second openings  133 - 4  adjacent to each other may be reduced or increased in a tensile direction of the second mask sheet  133 - 2 . For example, the plurality of second openings  133 - 4  may be tilted to have an angle different from 0 degrees with respect to the tensile direction of the second mask sheet  133 - 2 . For example, the plurality of second openings  133 - 4  may be arranged to form an angle of 45 degrees with respect to the tensile direction of the second mask sheet  133 - 2 . In this case, the plurality of second openings  133 - 4  may each have a planar shape corresponding to the planar shape of the second sub-pixel F 2  described with reference to  FIG. 20 . In addition, each second opening  133 - 4  may be arranged to correspond to a respective second sub-pixel F 2 . 
     In an embodiment, the centers of some of the second openings  133 - 4  may form a straight line in one direction. For example, the centers of second openings  133 - 4  arranged with each other in a tensile direction of the second mask sheet  133 - 2  may be arranged with each other on a straight line, and the centers of second openings  133 - 4  arranged with each other in a direction perpendicular to the tensile direction of the second mask sheet  133 - 2  may be arranged with each other on a straight line. In this case, the plurality of second openings  133 - 4  may be arranged in a plurality of columns and rows. In another embodiment, the centers of some of the plurality of second openings  133 - 4  may form a straight line, and the centers of the other ones of the plurality of second openings  133 - 4  may not form a straight line. For example, among the plurality of second openings  133 - 4  described above, the centers of second openings  133 - 4  in a line which are arranged with each other in a tensile direction of the second mask sheet  133 - 2  may form a straight line. On the other hand, among the plurality of second openings  133 - 4 , the centers of second openings  133 - 4  arranged in a direction perpendicular to the tensile direction of the second mask sheet  133 - 2  may be arranged in a serpentine shape (or a zigzag shape). However, hereinafter, for convenience of description, a case where the centers of the some of the plurality of second openings  133 - 4  form a straight line and the centers of the other ones of the plurality of second openings  133 - 4  do not form a straight line will be mainly described in more detail. The plurality of second openings  133 - 4  may be rectangular. 
     The second mask sheet  133 - 2  may be fixed to a second mask frame in a state where a tensile force is applied to the second mask sheet  133 - 2 , as described above. In this case, when the plurality of second openings  133 - 4  are all tilted in the same direction with respect to a tensile direction of the second mask sheet  133 - 2 , deformation of the second mask sheet  133 - 2  may exceed a predictable range because degrees of deformation between the right and left or between the front and back of the second mask sheet  133 - 2  are different from each other. For example, in the above case, one portion of the second mask sheet  133 - 2  is largely deformed and the other portion of the second mask sheet  133 - 2  is not deformed or is slightly deformed (e.g., deformed less than the one portion of the second mask sheet  133 - 2 ) so that the shape of a second opening  133 - 4  may be distorted or the shape of the some of the plurality of second openings  133 - 4 , and the shape of another second opening  133 - 4  or the shape of the other ones of the plurality of second openings  133 - 4  may be different from each other. For example, the degree of deformation of the plurality of second openings  133 - 4  may vary between the second openings  133 - 4 . Furthermore, in the above case, the centers of some of the plurality of second openings  133 - 4  (e.g., the centers of some of the plurality of second openings  133 - 4  arranged with each other in the tensile direction) may not be on a line (e.g., a straight line). 
     However, as described above, the some of the plurality of second openings  133 - 4  and the other ones of the plurality of second openings  133 - 4  are formed on the second mask sheet  133 - 2  by being tilted in different directions with respect to the tensile direction of the second mask sheet  133 - 2 . Therefore, the degree of deformation of the second mask sheet  133 - 2  during tensioning of the second mask sheet  133 - 2  may be uniformly maintained throughout the entire second mask sheet  133 - 2 . For example, it is possible to induce uniform deformation throughout the second mask sheet  133 - 2  by tilting second openings  133 - 4  adjacent to each other in different directions with respect to the tensile direction of the second mask sheet  133 - 2 . 
       FIG. 23  is a plan view of a portion of a third mask sheet for depositing a third intermediate layer shown in  FIG. 20 . 
     Referring to  FIG. 23 , the third mask sheet  143 - 2  may be similar to the second mask sheet  133 - 2  and the third openings  143 - 4  may be arranged similarly to the second openings  133 - 4 . However, when the second mask sheet  133 - 2  and the third mask sheet  143 - 2  are arranged to be stacked on each other, the second mask sheet  133 - 2  and the third mask sheet  143 - 2  may be manufactured such that the second openings  133 - 4  and the third openings  143 - 4  do not overlap each other. 
     In this case, the planar shape of each of the third openings  143 - 4  may be arranged to correspond to the planar shape of the third sub-pixel F 3  described with reference to  FIG. 20 . In addition, the third opening  143 - 4  may be formed in the third mask sheet  143 - 2  to correspond to the position of the respective third sub-pixel F 3 . 
       FIG. 24A  is a plan view of the first sub-pixel F 1  shown in  FIG. 20 .  FIG. 24D  is a plan view illustrating a relationship among a first sub-pixel, an opening of a pixel-defining layer, and a first intermediate layer shown in  FIG. 24A . 
     Referring to  FIGS. 24A and 24D , as described above, in the first sub-pixel F 1 , the first side S 1  and the second side S 2  may have convex curved shapes and the third side S 3  and the fourth side S 4  may have concave curved shapes (see  FIG. 20 ). In the above case, the first side S 1  and the third side S 3  facing oppositely away from each other, and/or the second side S 2  and the fourth side S 4  facing oppositely away from each other may have different radii of curvature or may have different curved shapes. For example, in the above case, the planar area of a first sub-pixel F 1  in a case where at least one of the sides of the first sub-pixel F 1  has a protruding curve as described above may be greater than that of a first sub-pixel F 1  in a case where all the sides of the first sub-pixel F 1  have linear forms. 
     For example, when one of the four sides of the first sub-pixel F 1  has a protruding curve, the actual planar area of the first sub-pixel F 1  may be greater than a virtual planar area of the first sub-pixel F 1  obtained by connecting vertices of the first sub-pixel F 1  with straight lines. For example, a portion of one side of the first sub-pixel F 1 , which has a protruding curved shape, is partly away from the center of the first sub-pixel F 1 , and thus may protrude farther from the center of the pixel F 1  to the outside of the first sub-pixel F 1  as compared to a virtual side obtained by connecting vertices of the first subpixel F 1  with a straight line. 
     In addition, even when the first sub-pixel F 1  includes both a concave curve and a protruding curve as shown in  FIG. 24A , the planar area of the first sub-pixel F 1  may be further increased as compared to a case where each side of the first sub-pixel F 1  has a linear form. For example, a first area F 1 -SA 3  increased as the first side S 1  further protrudes to the outside of the first sub-pixel F 1  from a straight line connecting the vertices of the first sub-pixel F 1  may be greater than a third area F 1 -SA 1  reduced as the third side S 3  further retracts toward the inside of the first sub-pixel F 1  from the straight line connecting the vertices of the first sub-pixel F 1 . For example, the first area F 1 -SA 3  may be an area defined between an edge of the first sub-pixel F 1  at the first side S 1  between two vertices and a straight line connecting the two vertices, the third area F 1 -SA 1  may be an area defined between an edge of the first sub-pixel F 1  at the third side S 3  between another two vertices and a straight line connecting the other two vertices, and the first area F 1 -SA 3  may be greater than the third area F 1 -SA 1 . In this case, with respect to a parallel line parallel to a straight line passing through a virtual straight line CL that passes through the center of the first sub-pixel F 1  and connects vertices of first sub-pixels F 1  adjacent to each other, a first straight-line distance F 1 -D 1 , which is a distance between a point where the parallel line and the first side S 1  meet and a point where the parallel line and a straight line connecting vertices of the first side S 1  meet, may be greater than a third straight-line distance F 1 -D 2 , which is a distance between a point where the parallel line and the third side S 3  meet and a point where the parallel line and a straight line connecting vertices of the third side S 3  meet. For example, the first straight-line distance F 1 -D 1  may be a distance between the edge of the first sub-pixel F 1  at the first side S 1  between the two vertices and the straight line connecting the two vertices, the third straight-line distance F 1 -D 2  may be a distance between the edge of the first sub-pixel F 1  at the third side S 3  between the other two vertices and the straight line connecting the other two vertices, and the first straight-line distance F 1 -D 1  may be greater than the third straight-line distance F 1 -D 2 . 
     In addition, the relationship between a second area F 1 -SA 4  and a fourth area F 1 -SA 2  may be the same as or similar to the relationship between the first area F 1 -SA 3  and the third area F 1 -SA 1 . For example, the second area F 1 -SA 4  may be greater than the fourth area F 1 -SA 2 . In addition, the relationship between a second straight-line distance F 1 -D 3  and a fourth straight-line distance F 1 -D 4  is similar to the relationship between the first straight-line distance F 1 -D 1  and the third straight-line distance F 1 -D 2 , and the second straight-line distance F 1 -D 3  may be greater than the fourth straight-line distance F 1 -D 4 . 
     In this case, the area of the first sub-pixel F 1  may be greater than that of a case where the first sub-pixel F 1  is quadrangular. For example, the area of a first sub-pixel F 1  in a case where the first side S 1  and the second side S 2  have convex curved shapes and the third side S 3  and the fourth side S 4  have concave curved shapes may be greater than the area of a first sub-pixel F 1  in a case where the first sub-pixel F 1  has the shape of a square. 
     Therefore, in the above case, when at least one side of the first sub-pixel F 1  includes a curve (e.g., a convex curve), the area of the first sub-pixel F 1  may increase, thereby increasing the life (e.g., the life span) of the first sub-pixel F 1 . 
     In the above case, a tangent line at any point on a curved side of the first sub-pixel F 1  and a straight line parallel to a straight line connecting the centers of first sub-pixels F 1  arranged in one direction may form a first angle θ 1 . For example, in  FIG. 24 , any straight line parallel to a straight line connecting the centers of a plurality of first sub-pixels F 1  arranged in a first direction (e.g., the X-axis direction or the Y-axis direction in  FIG. 24 ), and a tangent line at any point on the first side S 1  may form the first angle θ 1 . In this case, the acute angle of an angle formed by any straight line parallel to a straight line connecting the centers of a plurality of first sub-pixels F 1  and the tangent line at any point on the first side S 1  may be defined as the first angle θ 1 . 
     The first angle θ 1  may have a range of about 20 degrees or more and about 70 degrees or less. When the first angle θ 1  is less than 20 degrees or exceeds 70 degrees, when external light is incident on the display device, the external light may not be dispersed from the inner wall of the opening OP of the pixel-defining layer  29 , and thus, a user may feel (e.g., see) glare. 
     The first sub-pixel F 1  may be defined by a lower end OP-DE of the opening OP of the pixel-defining layer  29 . In this case, the lower end OP-DE of the opening OP of the pixel-defining layer  29  may define an area and a planar shape in which the pixel electrode  28 - 1  of  FIG. 3  is exposed to the outside. In this case, the lower end OP-DE of the opening OP of the pixel-defining layer  29  may refer to a region where the pixel-defining layer  29  and the pixel electrode  28 - 1  contact each other. In this case, the lower end OP-DE of the opening OP of the pixel-defining layer  29  may define a planar shape of the first sub-pixel F 1 . In addition, the planar shape of the upper end OP-UE of the opening OP of the pixel-defining layer  29  may be larger than the planar shape of the lower end OP-DE of the opening OP. In this case, when viewed from the top (e.g., from the plan view), the lower end OP-DE of the opening OP of the pixel-defining layer  29  may be arranged inside an upper end OP-UE of the opening OP of the pixel-defining layer  29 . 
     The upper end OP-UE of the opening OP of the pixel-defining layer  29  as well as the lower end OP-DE of the opening OP of the pixel-defining layer  29  may be arranged inside the first intermediate layer  28 - 2 A on a plane (e.g., in the plan view). For example, the first intermediate layer  28 - 2 A may be arranged to cover (e.g., overlap, for example, entirely overlap) not only the lower end OP-DE of the opening OP of the pixel-defining layer  29  but also the upper end OP-UE of the opening OP of the pixel-defining layer  29 , and thus, the same color may be emitted from the entire first sub-pixel F 1 . 
     In the above case, at least one selected from the planar shape of the first intermediate layer  28 - 2 A and the planar shape of the upper end OP-UE of the opening OP of the pixel-defining layer  29  may be the same as (e.g., may correspond to) the planar shape of the lower end OP-DE of the opening OP of the pixel-defining layer  29  and may have a different size from that of the planar shape of the lower end OP-DE. A straight-line distance from an edge of at least one selected from the planar shape of the first intermediate layer  28 - 2 A and the planar shape of the upper end OP-UE of the opening OP of the pixel-defining layer  29  to the planar shape of the lower end OP-DE of the opening OP of the pixel-defining layer  29  may be the same for (e.g., along) the entire edge of the planar shape of the lower end OP-DE of the opening OP of the pixel-defining layer  29 . 
     In some embodiments, the planar shape of the first intermediate layer  28 - 2 A may be different from the planar shape of the lower end OP-DE of the opening OP of the pixel-defining layer  29 . Even in this case, as described above, the planar shape of the lower end OP-DE of the opening OP of the pixel-defining layer  29  and the planar shape of the upper end OP-UE of the opening OP of the pixel-defining layer  29  may be arranged inside the planar shape of the first intermediate layer  28 - 2 A (e.g., when viewed in the plan view). However, hereinafter, for convenience of description, a case where the planar shape of the lower end OP-DE of the opening OP of the pixel-defining layer  29 , the planar shape of the upper end OP-UE of the opening OP of the pixel-defining layer  29 , and the planar shape of the intermediate layer  28 - 2 A are all the same as (e.g., all correspond to) the planar shape the first sub-pixel F 1  described above will be mainly described in more detail. 
       FIG. 24C  is a plan view of the second sub-pixel F 2  of  FIG. 20 . 
     Referring to  FIG. 24C , the second sub-pixel F 2  may have a curve in which the sixth side S 6  protrudes away from the center of the second sub-pixel F 2  as described above (see  FIG. 20 ). In this case, the planar area of the second sub-pixel F 2  may be greater than that of a case where the second sub-pixel F 2  is quadrangular. For example, when the vertices of the second sub-pixel F 2  are connected to each other in a straight line, the second sub-pixel F 2  may have a rectangular shape F 2 - 1 . In this case, the sixth side S 6  may have a shape that protrudes farther from the center of the second sub-pixel F 2  than a straight line connecting vertices arranged at the ends of the sixth side S 6 . 
     In the above case, the actual planar area of the second sub-pixel F 2  may be greater than the planar area of the rectangular shape F 2 - 1  obtained by connecting the vertices of the second sub-pixel F 2  to each other. 
     In the above case, a tangent line of the sixth side S 6 , which is a curved line, may form a second angle θ 2  with respect to a straight line parallel to an arbitrary straight line passing through the center of the second sub-pixel F 2 . In this case, the arbitrary straight line passing through the center of the second sub-pixel F 2  may be a straight line passing through the centers of a plurality of second sub-pixels F 2  arranged in the X-axis direction in  FIG. 20 . The second angle θ 2  may be an acute angle and may be in a range of about 20 degrees or more and about 70 degrees or less. 
     In the above case, a relationship among the second sub-pixel F 2 , the opening OP of the pixel-defining layer  29 , and the second intermediate layer  28 - 2 B may be determined similarly to the relationship among the first sub-pixel F 1 , the opening OP of the pixel-defining layer  29 , and the first intermediate layer  28 - 2 A shown in  FIG. 24D . 
       FIG. 24B  is a plan view of the third sub-pixel F 3  of  FIG. 20 . 
     Referring to  FIG. 24B , the third sub-pixel F 3  may have a curve in which the twelfth side S 12  protrudes away from the center of the third sub-pixel F 3  as described above (see  FIG. 20 ). In this case, the planar area of the third sub-pixel F 3  may be greater than that of a case where the third sub-pixel F 3  has a quadrangular shape. For example, when the vertices of the third sub-pixel F 3  are connected to each other in a straight line, the third sub-pixel F 3  may have a rectangular shape F 3 - 1 . In this case, the twelfth side S 12  may have a shape that protrudes farther from the center of the third sub-pixel F 3  than a straight line connecting vertices arranged at the ends of the twelfth side S 12 . 
     In the above case, the actual planar area of the third sub-pixel F 3  may be greater than the planar area of the rectangular shape F 3 - 1  obtained by connecting the vertices of the third sub-pixel F 3  to each other. 
     In the above case, a tangent line of the twelfth side S 12 , which is a curved line, may form a third angle θ 3  with respect to a straight line parallel to an arbitrary straight line passing through the center of the third sub-pixel F 3 . In this case, the arbitrary straight line passing through the center of the third sub-pixel F 3  may be a straight line passing through the centers of a plurality of third sub-pixels F 3  arranged with each other in the X-axis direction in  FIG. 20 . The third angle θ 3  may be an acute angle and may be in a range of about 20 degrees or more and about 70 degrees or less. 
     In the above case, a relationship among the third sub-pixel F 3 , the opening OP of the pixel-defining layer  29 , and the third intermediate layer  28 - 2 C may be determined similarly to the relationship among the first sub-pixel F 1 , the opening OP of the pixel-defining layer  29 , and the first intermediate layer  28 - 2 A shown in  FIG. 24D . 
       FIG. 25  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment.  FIG. 26A  is a plan view of the second sub-pixel shown in  FIG. 25 .  FIG. 26B  is a plan view of the third sub-pixel shown in  FIG. 25 . 
     Referring to  FIGS. 25 to 26B , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of a display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. In this case, the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may be arranged in the same manner as or similar to those shown in  FIG. 20 . 
     Because the first sub-pixel F 1  is the same as or similar to that shown in  FIG. 20 , a more detailed description thereof may not be provided. 
     A fifth side S 5  and a seventh side S 7  of the second sub-pixel F 2  may each have a linear shape. On the other hand, a sixth side S 6  and an eighth side S 8  may each have a protruding curved shape. In this case, the area of the planar shape of the second sub-pixel F 2  may be greater than the area of the planar shape of a virtual rectangular shape F 2 - 1  obtained by connecting the vertices of the second sub-pixel F 2 . For example, the sixth side S 6  and the eighth side S 8  may protrude farther from the second sub-pixel F 2  than a straight line connecting the ends of the sixth side S 6  and a straight line connecting the ends of the eighth side S 8 , respectively. 
     A tenth side S 10  and an eleventh side S 11  of the third sub-pixel F 3  may each be formed in a linear shape. In addition, a ninth side S 9  and a twelfth side S 12  may each be formed in a curved shape. In this case, the ninth side S 9  may have a concave shape, and the twelfth side S 12  may have a convex shape. In the above case, compared to a case where each side of the third sub-pixel F 3  is a straight line, a sixth area F 3 -SA 1  of the third sub-pixel F 3 , which is reduced by the shape of the ninth side S 9 , may be less than a fifth area F 3 -SA 2  that is increased by the shape of the twelfth side S 12 . In this case, a fifth straight-line distance F 3 -D 1  between the twelfth side S 12  and an arbitrary straight line (e.g., a line connecting the vertices at the ends of the twelfth side S 12 ) may be greater than a sixth straight-line distance F 3 -D 2  between the ninth side S 9  and an arbitrary straight line (e.g., a straight line connecting the vertices at the ends of the ninth side S 9 ). The fifth straight-line distance F 3 -D 1  and the sixth straight-line distance F 3 -D 2  may be measured in a similar manner to the first straight-line distance F 1 -D 1  to the fourth straight-line distance F 1 -D 4  described above. 
     In the above case, the planar area of the first sub-pixel F 1 , the planar area of the second sub-pixel F 2 , and the planar area of the third sub-pixel F 3  may be further increased as compared to those in a case where each of the sides of each of the first to third sub-pixels F 1  to F 3  is a straight line. In this case, an area occupied, in a pixel area AR, by at least one of the plurality of sub-pixels arranged in the pixel area AR may be greater than that in a case where each side of each sub-pixel is a straight line. 
     Accordingly, a sub-pixel including a curve in the planar shape thereof has an increased area of (e.g., in) a pixel area AR than that of a sub-pixel having sides each having a linear shape, and thus, the life and emission area of the sub-pixel including a curve may increase. 
       FIG. 27  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 27 , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of the display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. In this case, the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may be arranged similar to those shown in  FIG. 20 . Because the first sub-pixel F 1  has the same shape as that shown in  FIG. 20 , a more detailed description thereof may not be provided. 
     The second sub-pixel F 2  may have a shape corresponding to that of the third sub-pixel F 3  shown in  FIG. 25 . On the other hand, the third sub-pixel F 3  may have a shape corresponding to that of the second sub-pixel F 2  shown in  FIG. 25 . For example, a sixth side S 6  (see  FIG. 20 ) of the second sub-pixel F 2  may have a protruding curve, and an eighth side S 8  may have a concave curved shape. In this case, a fifth side S 5  and a seventh side S 7 , which connect the end(s) of the sixth side S 6  to the eighth side S 8 , may each have a linear shape. In addition, a ninth side S 9  and a twelfth side S 12  of the third sub-pixel F 3  may each have a protruding curved shape. In this case, the planar area of the second sub-pixel F 2  may be equal to or greater than the planar area of the second sub-pixel F 2  when each of the sides of the second sub-pixel F 2  is a straight line. Also, the planar area of the third sub-pixel F 3  may be greater than the planar area of the third sub-pixel F 3  when each of the sides of the third sub-pixel F 3  is a straight line. 
     In the above case, the distance between the end of the ninth side S 9  of the third sub-pixel F 3  and the end of the twelfth side S 12  may be different from the distance between the end of the sixth side S 6  of the second sub-pixel F 2  and the end of the eighth side S 8 . For example, the distance between the end of the ninth side S 9  of the third sub-pixel F 3  and the end of the twelfth side S 12  may be greater than the distance between the end of the sixth side S 6  of the second sub-pixel F 2  and the end of the eighth side S 8 . 
     When the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  are formed as described above, the planar area of at least one of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  in the pixel area AR may be increased as compared to when each of the sides of each of the first to third sub-pixels F 1  to F 3  is a straight line. In this case, as the planar area of at least one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  in the pixel area AR may increase, the life of a sub-pixel having an increased area may increase. In addition, by arranging a sub-pixel in which at least one side of the planar shape thereof includes a curve, reflection of external light by the inner surface of an opening of a pixel-defining layer may be reduced. 
       FIG. 28  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 28 , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of the display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. 
     In the above case, the second sub-pixel F 2  and the third sub-pixel F 3  may be arranged to be adjacent to the first sub-pixel F 1 . In this case, the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may be arranged in one direction. For example, the center of the first sub-pixel F 1 , the center of the second sub-pixel F 2 , and the center of the third sub-pixel F 3  may be arranged with each other on a straight line. Also, the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may be arranged tilted with respect to a user&#39;s viewing direction. For example, in the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , a straight line connecting vertices adjacent to each other may not form a right angle with, or may not be parallel to, a straight line connecting the centers of first sub-pixels F 1 . 
     In this case, at least one selected from the first side S 1 , the second side S 2 , the third side S 3  and the fourth side S 4  of the first sub-pixel F 1  may be protruding or retracted. Also, at least one selected from the first side S 1 , the second side S 2 , the third side S 3  and the fourth side S 4  of the first sub-pixel F 1  may be curved. For example, as shown in  FIG. 28 , the first side S 1  and the third side S 3  of the first sub-pixel F 1  may be concave curves, and the second side S 2  and the fourth side S 4  of the first sub-pixel F 1  may be convex curves. In some embodiments, the first side S 1 , the second side S 2 , the third side S 3  and the fourth side S 4  of the first sub-pixel F 1  may all be formed to be straight lines, concave curves, or convex curves different from those shown in the drawings. In this case, when the first side S 1 , the second side S 2 , the third side S 3 , and the fourth side S 4  of the first sub-pixel F 1  are all formed to be straight, the planar shape of the first sub-pixel F 1  may be a rhombus or square shape. 
     The second sub-pixel F 2  and the third sub-pixel F 3  may be arranged to face at least one selected from the first side S 1 , the second side S 2 , the third side S 3 , and the fourth side S 4  of the first sub-pixel F 1  (e.g., of one or more of adjacent first sub-pixels F 1 ). In this case, the second sub-pixel F 2  and the third sub-pixel F 3  may be arranged such that a short side of the second sub-pixel F 2  and a short side of the third sub-pixel F 3  face one side of the first sub-pixel F 1  or a long side of the second sub-pixel F 2  and a long side of the third sub-pixel F 3  face one side of the first sub-pixel F 1 . 
     In the above case, at least one selected from the fifth side S 5 , the sixth side S 6 , the seventh side S 7  and the eighth side S 8  of the second sub-pixel F 2  may be concave or convex, and may be curved. In addition, at least one selected from the ninth side S 9 , the tenth side S 10 , the eleventh side S 11  and the twelfth side S 12  of the third sub-pixel F 3  may be concave or convex, and may be curved. 
     In the above case, the sixth side S 6  of the second sub-pixel F 2  may have a convex curved shape, and the twelfth side S 12  of the third sub-pixel F 3  may have a convex curved shape. In this case, the first side S 1  of the first sub-pixel F 1  facing the sixth side S 6 , and the third side S 3  of the first sub-pixel F 1  facing the twelfth side S 12 , may each have a concave curved shape. In this case, a straight-line distance, which is the shortest distance from a point of the sixth side S 6  to the first side S 1 , may be constant throughout the sixth side S 6  in a length direction of the sixth side S 6 , and a straight-line distance, which is the shortest distance from a point of the twelfth side S 12  to the third side S 3 , may be the same for the entire twelfth side S 12  in a length direction of the twelfth side S 12 . 
     In the above case, a spacer may be arranged between the first sub-pixel F 1  and the second sub-pixel F 2 , between the second sub-pixel F 2  and the third sub-pixel F 3 , and/or between the third sub-pixel F 3  and the first sub-pixel F 1 . In this case, the edge of the planar shape of the spacer may correspond to the shape of one side of a sub-pixel adjacent to the spacer. For example, when a spacer is arranged between the first sub-pixel F 1  and the third sub-pixel F 3 , one side of the spacer facing the third side S 3  may correspond to the shape of the third side S 3 . For example, one side of the spacer facing the third side S 3  may protrude toward the first sub-pixel F 1 . Also, another side of the spacer facing the twelfth side S 12  may correspond to the shape of the twelfth side S 12 . For example, the other side of the spacer facing the twelfth side S 12  may be retracted (e.g., may be concave) toward the inside of the spacer. In addition, when a spacer is arranged between the second sub-pixel F 2  and the third sub-pixel F 3 , the sides of each sub-pixel adjacent to the spacer are the eighth side S 8  and the tenth side S 10  and thus the sides of the spacer may be straight. When a spacer is arranged between the first sub-pixel F 1  and the second sub-pixel F 2 , one side of the planar shape of the spacer may correspond to the shape of the first side S 1  and another side of the planar shape of the spacer may correspond to the sixth side S 6 . In this case, the spacer may have a shape similar to the spacer between the third sub-pixel F 3  and the first sub-pixel F 1 . In addition, when a spacer is arranged between the seventh side S 7  and the second side S 2 , one side of the planar shape of the spacer facing the second side S 2  may have a retracted curved shape (e.g., a concave shape), and another side of the planar shape of the spacer facing the seventh side S 7  may have a linear shape. 
     Therefore, in the above case, in each sub-pixel, reflection of light due to external light may be reduced. In addition, in some of the plurality of sub-pixels, the life thereof may be increased by securing the maximum planar areas of sub-pixels included in the pixel area AR. 
       FIG. 29  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 29 , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of the display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. In this case, the first sub-pixel F 1  may have a shape that is the same as or similar to that described with reference to  FIG. 28 . 
     In the above case, the second sub-pixel F 2  may have a sixth side S 6  and an eighth side S 8 , each having a convex curved shape. In addition, the second sub-pixel F 2  may have a fifth side S 5  and a seventh side S 7 , each having a linear shape. In this case, the sixth side S 6  may be arranged to face a first side S 1 , and the straight-line distance between the sixth side S 6  and the first side S 1  may be constant along the side S 6  in a length direction of the sixth side S 6 . 
     The third sub-pixel F 3  may be arranged adjacent to the second sub-pixel F 2 . In this case, the third sub-pixel F 3  may have a twelfth side S 12  having a convex curved shape, a tenth side S 10  having a concave curved shape, and a ninth side S 9  and an eleventh side S 11  each having a linear shape. 
     In the above case, spacers may be arranged between respective two sub-pixels. In this case, each side of the edge of the planar shape of each of the spacers may have a shape corresponding to the shape of each side of the planar shape of a sub-pixel adjacent to the spacer. 
     In the above case, one side of the planar shape of each sub-pixel may have a shape corresponding to one side of the planar shape of another sub-pixel adjacent to the sub-pixel. In this case, the distance between sub-pixels adjacent to each other is constant, and thus a space in which a spacer is arranged may be provided. 
     In addition, at least one side of the edge of the planar shape of each sub-pixel is formed to have a curved shape, and thus reflection of external light may be reduced. 
     In addition, the planar shape of each sub-pixel includes one side having a protruding curved shape, and thus the areas of sub-pixels arranged in the pixel area AR may increase. 
       FIG. 30  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 30 , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of the display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. 
     The first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  as described above may have shapes obtained by rotating, by 90 degrees (e.g., in a clockwise angular direction), each of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  shown in  FIG. 29 , based on the center of one sub-pixel (e.g., based on their respective centers). In this case, the shapes of the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may be the same as those shown in  FIG. 29 . 
     In the above case, spacers may be arranged between each two sub-pixels (e.g., each two adjacent sub-pixels). In this case, each side of the edge of the planar shape of each of the spacers may have a shape corresponding to the shape of each side (e.g., a side facing the spacer) of the planar shape of a sub-pixel adjacent to the spacer. 
       FIG. 31  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 31 , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of the display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. In this case, the first sub-pixel F 1  may have a shape that is the same as or similar to that arranged in  FIG. 30 . 
     A short side of the second sub-pixel F 2  and a short side of the third sub-pixel F 3  may be arranged adjacent to the second side S 2  and the fourth side S 4  of the first sub-pixel F 1 . In addition, a long side of the second sub-pixel F 2  and a long side of the third sub-pixel F 3  may be arranged adjacent to the first side S 1  or the third side S 3  of the first sub-pixel F 1 . 
     In this case, the sides of sub-pixels adjacent to each other may have shapes corresponding to each other. For example, one side of one sub-pixel that faces another side of another sub-pixel adjacent to the one sub-pixel may have a shape that corresponds to a shape of the other side of the other sub-pixel. For example, the first side S 1  and the third side S 3  may be concave, and the sixth side S 6  and the twelfth side S 12  facing the first side S 1  and the third side S 3 , respectively, may be convex. On the other hand, the eighth side S 8  and the tenth side S 10  facing each other may be straight. 
     In addition to the above case, the shapes of the sides of sub-pixels facing each other may be different from each other. For example, the second side S 2  facing the seventh side S 7  and the eleventh side S 11 , and the fourth side S 4  facing the fifth side S 5  and the ninth side S 9  may each have a protruding curved shape. On the other hand, the fifth side S 5 , the seventh side S 7 , the ninth side S 9 , and the eleventh side S 11  may all be straight. In another embodiment, the fifth side S 5 , the seventh side S 7 , the ninth side S 9  and the eleventh side S 11  may each have a concave curved shape to correspond to the second side S 2  or the fourth side S 4 . 
     In the above case, spacers may be arranged between each two sub-pixels (e.g., each two adjacent sub-pixels). In this case, each side of the edge of the planar shape of each of the spacers may have a shape corresponding to the shape of each side (e.g., a side facing the spacer) of the planar shape of a sub-pixel adjacent to the spacer. 
       FIG. 32  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 32 , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of the display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. 
     The first sub-pixel F 1  may be the same as that of  FIG. 31  described above. The second sub-pixel F 2  may be the same (e.g., may have the same or similar shape) as the third sub-pixel F 3  of  FIG. 30 , and the third sub-pixel F 3  may be the same (e.g., may have the same or similar shape) as the second sub-pixel F 2  of  FIG. 30 . In another embodiment, the first sub-pixel F 1  may be the same as that of  FIG. 31  described above. The second sub-pixel F 2  of  FIG. 32  and the third sub-pixel F 3  of  FIG. 30  may be the symmetrical, and the third sub-pixel F 3  of  FIG. 32  and the second sub-pixel F 2  of  FIG. 30  may be the symmetrical. For example, the tenth side S 10  and the twelfth side S 12  of the third sub-pixel F 3  may each have a convex curved shape, and the ninth side S 9  and the eleventh side S 11  may each have a linear shape. In addition, the sixth side S 6  of the second sub-pixel F 2  may have a convex curved shape, the eighth side S 8  may have a concave curved shape, and the fifth side S 5  and the seventh side S 7  may each have a linear shape. 
     The distance between vertices of the planar shape of the second sub-pixel F 2  arranged in the same direction as described above may be less than the distance between vertices of the planar shape of the third sub-pixel F 3 . Also, the distance between the ends of a long side of the second sub-pixel F 2  may be equal to the distance between the ends of a long side of the third sub-pixel F 3 . 
     In the above case, spacers may be arranged between each two sub-pixels. In this case, each side of the edge of the planar shape of each of the spacers may have a shape corresponding to the shape of each side (e.g., a side facing the spacer) of the planar shape of a sub-pixel adjacent to the spacer. 
       FIG. 33  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 33 , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of the display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. 
     The first sub-pixel F 1  may be the same as that shown in  FIG. 29 . The third sub-pixel F 3  and the second sub-pixel F 2  may be arranged adjacent to the first side S 1  and the third side S 3 , respectively. In this case, a long side of the third sub-pixel F 3  and a long side of the second sub-pixel F 2  may be adjacent to the first side S 1  and the third side S 3 , respectively. Furthermore, a short side of the second sub-pixel F 2  and a short side of the third sub-pixel F 3  may be adjacent to the second side S 2  and the fourth side S 4 , respectively. For example, one short side of each of the second and third sub-pixels F 2  and F 3  may be adjacent to the second side S 2 , and another short side of each of the second and third sub-pixels F 2  and F 3  may be adjacent to the fourth side S 4  (e.g., of another first sub-pixel F 1 ). 
     In the above case, the sixth side S 6  of the second sub-pixel F 2 , and the tenth side S 10  and the twelfth side S 12  of the third sub-pixel F 3 , may each have a convex curved shape. On the other hand, the eighth side S 8  of the second sub-pixel F 2  may have a concave curved shape. In the above case, the shapes of the sides of sub-pixels adjacent to each other may be formed to correspond to each other. 
     In the above case, spacers may be arranged between each two sub-pixels. In this case, each side of the edge of the planar shape of each of the spacers may have a shape corresponding to the shape of each side (e.g., a side facing the spacer) of the planar shape of a sub-pixel adjacent to the spacer. 
       FIG. 34  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 34 , a display device may include a display area and a non-display area defined on a substrate, the non-display area being around the display area. A plurality of sub-pixels including a first sub-pixel F 1 ′, a second sub-pixel F 2 ′, and a third sub-pixel F 3 ′ may be arranged in the display area, and a power line may be arranged in the non-display area. In addition, a pad portion may be arranged in the non-display area. The display device may include a display substrate, an intermediate layer arranged in the display area, an opposite electrode, and a thin-film encapsulation layer. 
     The first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ may emit light of different colors. For example, one selected from the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ may emit blue light, another one selected from the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ may emit red light, and the remaining one selected from the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ may emit green light. 
     Hereinafter, for convenience of description, a case where the first sub-pixel F 1 ′ is to emit blue light, the second sub-pixel F 2 ′ is to emit green light, and the third sub-pixel F 3 ′ is to emit red light will be mainly described in more detail. 
     The first sub-pixel F 1 ′ as described above may include a first intermediate layer  28 - 2 A′, and the first intermediate layer  28 - 2 A′ may correspond to the shape and position of the first sub-pixel F 1 ′. The planar area of the first intermediate layer  28 - 2 A′ may be equal to or greater than the planar area of the first sub-pixel F 1 ′, and the first sub-pixel F 1 ′ may be arranged inside the first intermediate layer  28 - 2 A′ (e.g., in the plan view). 
     The second sub-pixel F 2 ′ may include a second intermediate layer  28 - 2 B′. In addition, the second intermediate layer  28 - 2 B′ may correspond to the shape and position of the second sub-pixel F 2 ′. The second sub-pixel F 2 ′ may be arranged inside the second intermediate layer  28 - 2 B (e.g., in the plan view). 
     The third sub-pixel F 3 ′ may include a third intermediate layer  28 - 2 C′. In addition, the third intermediate layer  28 - 2 C′ may correspond to the shape and position of the third sub-pixel F 3 ′. The third sub-pixel F 3 ′ may be arranged inside the third intermediate layer  28 - 2 C′ (e.g., in the plan view). 
     The planar area of each of the second sub-pixels F 2 ′ and the planar area of each of the third sub-pixels F 3 ′ may be different from each other. For example, one selected from the planar area of the second sub-pixel F 2 ′ and the planar area of the third sub-pixel F 3 ′ may be less than the other one selected from the planar area of the second sub-pixel F 2 ′ and the planar area of the third sub-pixel F 3 ′. In an embodiment, the planar area of the second sub-pixel F 2 ′ may be less than the planar area of the third sub-pixel F 3 ′. In another embodiment, the planar area of the third sub-pixel F 3 ′ may be less than the planar area of the second sub-pixel F 2 ′. Therefore, an aperture ratio of light emitted from each sub-pixel may be adjusted (e.g., adjustable). 
     As described above, the adjustment of the area of at least one selected from the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ may be achieved by adjusting an area where a pixel-defining layer exposes a pixel electrode, as described above. In this case, the areas and shapes of the first intermediate layer  28 - 2 A′, the second intermediate layer  28 - 2 B′, and the third intermediate layer  28 - 2 C′ formed by being respectively deposited on the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′ may correspond to the areas and shapes of the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′, respectively, to prevent the sub-pixels from overlapping each other or to reduce the amount of such overlap. 
     Each of the intermediate layers  28 - 2 A′,  28 - 2 B′ and  28 - 2 C′ as described above may be formed utilizing a mask sheet. 
     In at least one selected from the first sub-pixel F 1 ′, the second sub-pixel F 2 ′, and the third sub-pixel F 3 ′, at least one side of the edge of the planar shape thereof may have a curved shape. In this case, the first sub-pixel F 1 ′ may be the same as that shown in  FIG. 20 , and the second sub-pixel F 2 ′ and the third sub-pixel F 3 ′ may be similar to those shown in  FIG. 20 . In this case, the second sub-pixel F 2 ′ may be larger than the third sub-pixel F 3 ′, as described above. 
     In the above, the sides of the planar shapes of sub-pixels facing each other may have shapes corresponding to each other. For example, in  FIG. 34 , the fourth side S 4  may have a concave curved shape, and the sixth side S 6  facing the fourth side S 4  may have a convex curved shape. Furthermore, the third side S 3  may be a concave curve, and the twelfth side S 12  facing the third side S 3  may be a convex curve. In addition, the eighth side S 8  and the tenth side S 10  facing each other may be straight. 
     In addition to the above case, the first side S 1  and the second side S 2  may be convex curved, while the seventh side S 7  and the eleventh side S 11  facing the first side S 1  or the second side S 2  may be straight. In another embodiment, all of the first side S 1 , the second side S 2 , the seventh side S 7 , and the eleventh side S 11  may be straight. 
     In the above case, the shape of each sub-pixel is not limited thereto, and the arrangement of each sub-pixel may have a shape described above with reference to  FIGS. 20 to 33 . In this case, in at least one selected from the plurality of sub-pixels, one side of the edge of the planar shape thereof may have a protruding curved shape. In this case, because the one side has a protruding curved shape, the areas of some sub-pixels (e.g., the sub-pixels having a protruding curved shape) arranged in the pixel area AR may increase. In addition, when the planar shape of each of the plurality of sub-pixels includes at least one selected from a concave curve and a convex curve, reflection of external light from a pixel-defining layer of each sub-pixel may be reduced. 
     In the above case, spacers may be arranged between each two of the sub-pixels. In this case, each side of the edge of the planar shape of each of the spacers may have a shape corresponding to the shape of each side (e.g., a side facing the spacer) of the planar shape of a sub-pixel adjacent to the spacer. 
       FIG. 35  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment.  FIG. 36  is a plan view of a portion of a first mask sheet for depositing a first intermediate layer of the first sub-pixel shown in  FIG. 35 .  FIG. 37  is a plan view of a portion of a second mask sheet for depositing a second intermediate layer of the second sub-pixel shown in  FIG. 35 .  FIG. 38  is a plan view of a portion of a third mask sheet for depositing a third intermediate layer of the third sub-pixel shown in  FIG. 35 . 
     Referring to  FIGS. 35 to 38 , a display device may include a display area and a non-display area defined on a substrate, the non-display area being around the display area. A plurality of sub-pixels including a first sub-pixel F 1 ′″, a second sub-pixel F 1 ′″, and a third sub-pixel F 3 ′″ may be arranged in the display area, and a power line may be arranged in the non-display area. In addition, a pad portion may be arranged in the non-display area. The display device may include a display substrate, an intermediate layer arranged in the display area, an opposite electrode, and a thin-film encapsulation layer. 
     The first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may emit light of different colors. For example, one selected from the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may emit blue light, another one selected from the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may emit red light, and the remaining one selected from the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may emit green light. 
     One selected from the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may be square, and the other two may be rectangular. 
     Hereinafter, for convenience of description, a case where the first sub-pixel F 1 ′″ is square and is to emit red light, the second sub-pixel F 2 ′″ is rectangular and is to emit green light, and the third sub-pixel F 3 ′″ is rectangular and is to emit blue light will be mainly described in more detail. 
     The first sub-pixel F 1 ′″ as described above may include a first intermediate layer  28 - 2 A′″, and the first intermediate layer  28 - 2 A′″ may correspond to the shape and position of the first sub-pixel F 1 ′″. The planar area of the first intermediate layer  28 - 2 A′″ may be greater than the planar area of the first sub-pixel F 1 ′″, and the first sub-pixel F 1 ′″ may be arranged inside the first intermediate layer  28 - 2 A′″ (e.g., in the plan view). 
     The second sub-pixel F 2 ′″ may include a second intermediate layer  28 - 2 B′″. In addition, the second intermediate layer  28 - 2 B′″ may correspond to the shape and position of the second sub-pixel F 1 ′″. The second sub-pixel F 2 ′″ may be arranged inside the second intermediate layer  28 - 2 B′″(e.g., in the plan view). 
     The third sub-pixel F 3 ′″ may include a third intermediate layer  28 - 2 C′″. In addition, the third intermediate layer  28 - 2 C′″ may correspond to the shape and position of the third sub-pixel F 3 ′″. The third sub-pixel F 3 ′″ may be arranged inside the third intermediate layer  28 - 2 C′″ (e.g., in the plan view). 
     The first subpixel F 1 ′″, the second subpixel F 1 ′″, and the third subpixel F 3 ′″ may have all (e.g., any of) the shapes and arrangements described above. However, hereinafter, for convenience of description, a case where the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ are arranged in the same arrangement as shown in  FIG. 20  will be mainly described in more detail. 
     At least one selected from the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″ may have a chamfered edge. For example, in an embodiment, one selected from a vertex of the first sub-pixel F 1 ′″, a vertex of the second sub-pixel F 1 ′″, and a vertex of the third sub-pixel F 3 ′″ may be chamfered, and the remaining two of them may not be chamfered. In another embodiment, two selected from the vertex of the first sub-pixel F 1 ′″, the vertex of the second sub-pixel F 1 ′″, and the vertex of the third sub-pixel F 3 ′″ may be chamfered, and the remaining one of them may not be chamfered. In another embodiment, all of the vertex of the first sub-pixel F 1 ′″, the vertex of the second sub-pixel F 1 ′″, and the vertex of the third sub-pixel F 3 ′″ may be chamfered. Hereinafter, for convenience of description, a case where all of the vertex of the first sub-pixel F 1 ′″, the vertex of the second sub-pixel F 1 ′″, and the vertex of the third sub-pixel F 3 ′″ are chamfered will be mainly described in more detail. 
     In order to form the vertex of the first sub-pixel F 1 ′″, the vertex of the second sub-pixel F 1 ′″, and the vertex of the third sub-pixel F 3 ′″ that are chamfered as described above, a vertex (or corner) of a first opening  123 - 4 ′″ of a first mask sheet  123 - 2 ′″, a vertex (or corner) of a second opening  133 - 4 ′″ of a second mask sheet  133 - 2 ′″, and a vertex (or corner) of a third opening  143 - 4 ′″ of a third mask sheet  143 - 2 ′″ may be chamfered. In this case, each of the first opening  123 - 4 , the second opening  133 - 4 ′″, and the third opening  143 - 4 ′″ may be the same as or similar to an octagonal shape. For example, chamfered portions in the first opening  123 - 4 ′″, the second opening  133 - 4 ′″, and the third opening  143 - 4 ′″ may be rounded, and may be formed in a linear shape, as shown in  FIGS. 36 to 38 . 
     When the vertex of the first opening  123 - 4 ′″, the vertex of the second opening  133 - 4 ′″, and the vertex of the third opening  143 - 4 ′″ are chamfered as described above, stress may not be concentrated on the vertex of the first opening  123 - 4 ′″, the vertex of the second opening  133 - 4 ′″, and the vertex of the third opening  143 - 4 ′″ when the first mask sheet  123 - 2 ′″, the second mask sheet  133 - 2 ′″, and the third mask sheet  143 - 2 ′″ are respectively under tension. Therefore, when the first mask sheet  123 - 2 ′″, the second mask sheet  133 - 2 ′″, and the third mask sheet  143 - 2 ′″ are respectively under tension, damage to the first mask sheet  123 - 2 ′″, the second mask sheet  133 - 2 ′″, and the third mask sheet  143 - 2 ′″ may be prevented or reduced. In addition, because a first deposition material, a second deposition material, and a third deposition material are not deposited, and do not clog, at the vertex of the first opening  123 - 4 ′″, the vertex of the second opening  133 - 4 ′″, and the vertex of the third opening  143 - 4 ′″, the first intermediate layer  28 - 2 A′″, the second intermediate layer  28 - 2 B′″, and the third intermediate layer  28 - 2 C′″ having correct shapes may be formed. 
     The display device may be manufactured through a display device manufacturing apparatus of the same or similar type (e.g., kind) as the display device manufacturing apparatus shown in  FIGS. 4 and 5  described above. 
     In this case, a first deposition unit may supply a first deposition material to the display substrate to form the first intermediate layer  28 - 2 A′″, a second deposition unit may supply a second deposition material to the display substrate to form the second intermediate layer  28 - 2 B′″, and a third deposition unit may supply a third deposition material to the display substrate to form the third intermediate layer  28 - 2 C′″. 
     In this case, the first mask sheet  123 - 2 ′″ utilized in the first deposition unit may include the first opening  123 - 4 ′″ formed to correspond to the shape of the first sub-pixel F 1 ′″. In this case, the planar area of the first opening  123 - 4 ′″ may be equal to or greater than the planar area of a corresponding first sub-pixel F 1 ′″. Also, the planar area of the first opening  123 - 4 ′″ may be similar to the planar area of the first intermediate layer  28 - 2 A′″ formed by depositing the first deposition material having passed through the first opening  123 - 4 ′″ on the display substrate. A shape of the first opening  123 - 4 ′″, a shape of the first intermediate layer  28 - 2 A′″, and a shape of the first sub-pixel F 1 ′″, which correspond to each other, may be the same and be square (e.g., square with chamfered vertices). 
     A second opening  133 - 4 ′″ of a second mask sheet  133 - 2 ′″ utilized in the second deposition unit may be formed to correspond to the shape of the second sub-pixel F 2 ′″. The second openings  133 - 4 ′″ may be arranged in the same manner as the arrangement of the second sub-pixels F 2 ′″. In this case, the planar area of the second opening  133 - 4 ′″ may be similar to the planar area of the second sub-pixel F 2 ′″, and may be equal to or greater than the planar area of the second intermediate layer  28 - 2 B′″ formed by depositing the second deposition material on the display substrate. 
     A third opening  143 - 4 ′″ of a third mask sheet  143 - 2 ′″ utilized in the third deposition unit is also formed to correspond to the shape of the third sub-pixel F 3 ′″, and the planar area of the third opening  143 - 4 ′″ may be equal to or greater than the planar area of the third sub-pixel F 3 ′″. Furthermore, the planar area of the third opening  143 - 4 ′″ may be similar to the planar area of the third intermediate layer  28 - 2 C′″. 
     The planar shape of each opening corresponding to each intermediate layer as described above may be the same as the planar shape of each sub-pixel corresponding to each intermediate layer. In this case, in some embodiments, the size of the planar shape of each opening may be greater than the size of the planar shape of a respective sub-pixel. 
     In this case, the first sub-pixel F 1 ′″, the second sub-pixel F 2 ′″ and the third sub-pixel F 3 ′″ may be similar to those described with reference to  FIG. 20 . A relationship among and/or between the first intermediate layer  28 - 2 A′″, the second intermediate layer  28 - 2 B′″, and the third intermediate layer  28 - 2 C′″ may be the same as the relationship among and/or between the first sub-pixel F 1 ′″, the second sub-pixel F 1 ′″, and the third sub-pixel F 3 ′″. 
     For example, the centers of some of a plurality of second sub-pixels F 2 ′″ may be arranged with each other on a straight line in one direction, and the centers of the other ones of the plurality of second sub-pixels F 2 ′″ may be arranged with each other in a serpentine (or zigzag) shape in another direction. Furthermore, the centers of a portion of a plurality of third sub-pixels F 3 ′″ may be arranged with each other on a straight line, and the centers of another portion of the plurality of third sub-pixels F 3 ′″ may be arranged with each other in a serpentine (or zigzag) shape in another direction. The centers of a plurality of first sub-pixels F 1 ′″ may be on (e.g., arranged with each other on) a straight line in a direction different from the one direction. In some embodiments, the centers of a plurality of first sub-pixels F 1 ′″ may be arranged with each other on a straight line in the one direction. 
     In addition, the second sub-pixel F 2 ′″ and the third sub-pixel F 3 ′″ facing the same first sub-pixel F 1 ′″ (e.g., the second sub-pixel F 2 ′″ facing one side of the first sub-pixel F 1 ′″ and the third sub-pixel F 3 ′″ facing another side of the first sub-pixel F 1 ′″) may be tilted in opposite directions with respect to a tensile direction of the second mask sheet  133 - 2 ′″ and a tensile direction of the third mask sheet  143 - 2 ′″. For example, the second sub-pixels F 2 ′″ adjacent (e.g., adjacent in a direction perpendicular to the tensile direction) to each other may form an angle of 45 degrees with respect to the tensile direction of the second mask sheet  133 - 2 ′″ in opposite directions, respectively. Also, the second openings  133 - 4 ′″ formed in the second mask sheet  133 - 2 ′″ and adjacent (e.g., adjacent in a direction perpendicular to the tensile direction) to each other may form an angle of 45 degrees with respect to the tensile direction of the second mask sheet  133 - 2 ′″. The third sub-pixels F 3 ′″ adjacent (e.g., adjacent in a direction perpendicular to the tensile direction) to each other may form an angle of 45 degrees with respect to the tensile direction of the third mask sheet  143 - 2 ′″ in opposite directions, respectively. Also, the third openings  143 - 4 ′″ formed in the third mask sheet  143 - 2 ′″ and adjacent (e.g., adjacent in a direction perpendicular to the tensile direction) to each other may form an angle of 45 degrees with respect to the tensile direction of the third mask sheet  143 - 2 ′″. The second intermediate layer  28 - 2 B′″ and the third intermediate layer  28 - 2 C′″ may be arranged on the display substrate at positions corresponding to the second opening  133 - 4 ′″ and the third opening  143 - 4 ′″, respectively. 
     In the above case, spacers may be arranged between each two sub-pixels. In this case, each side of the edge of the planar shape of each of the spacers may have a shape corresponding to the shape of each side (e.g., a side facing the spacer) of the planar shape of a sub-pixel adjacent to the spacer. 
     The display device may be fixed to a device or the like for moving a user, such as a vehicle. The display device may be fixed to the device to form a certain angle different from 0 degrees between a user&#39;s viewing direction and the first direction and/or the second direction. For example, the display device may be arranged such that the user&#39;s viewing direction of the display device and the first direction or the second direction form an angle of 90 degrees. 
     In the above case, when a user looks at the display device, an inclined portion of the pixel-defining layer is not perpendicular to the user&#39;s viewing direction. Accordingly, external light may be prevented from being reflected through (e.g., from) the inclined portion of the pixel-defining layer and being incident on the user&#39;s eyes, or the amount of external light reflected through the inclined portion of the pixel-defining layer may be reduced. 
     Further, the display device may implement a precise image through each sub-pixel. 
     According to the display device manufacturing apparatus and the display device manufacturing method, it is possible to manufacture the display device having an accurate deposition pattern. 
     Furthermore, according to the display device manufacturing apparatus and the display device manufacturing method, it is possible to reduce an error between a design pattern and an actual deposition pattern that may occur during manufacturing. 
       FIG. 39  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 39 , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of the display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. In this case, the plurality of sub-pixels may be arranged in the same manner as or similar to those shown in  FIG. 2 . 
     A spacer P may be arranged between the plurality of sub-pixels as described above. In this case, the position of the spacer P is not limited to that shown in  FIG. 39  and may be arranged between sub-pixels adjacent to each other in any suitable manner. The edge of the planar shape of the spacer P may be determined according to (e.g., may correspond to) one side of the planar shape of a sub-pixel adjacent to the spacer P. 
     In the above case, in at least one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , at least one side of the edge of the planar shape thereof may have a curved shape. In this case, in the at least one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , at least one side of the edge of the planar shape thereof may have a concave shape or a convex shape. 
     In the above case, the first side S 1  and the second side S 2  of the first sub-pixel F 1  may each have a linear shape, and the third side S 3  and the fourth side S 4  may each have a concave curved shape. Furthermore, the sixth side S 6  of the second sub-pixel F 2  may each be convex curved, and the fifth side S 5 , the seventh side S 7 , and the eighth side S 8  may each be straight. The twelfth side S 12  of the third sub-pixel F 3  may have a convex curved shape, and the ninth side S 9 , the tenth side S 10 , and the eleventh side S 11  may each have a linear shape. The planar shape of each sub-pixel as described above is not limited thereto, and may include all cases (e.g., any suitable planar shape) in which at least one side of the planar shape of the sub-pixel is formed in a curved shape. 
     When each sub-pixel is arranged as described above, a sub-pixel including a protruding curve from among the sub-pixels may have an increased area in the pixel area AR compared to a sub-pixel in which the edge of the planar shape thereof is straight. In this case, the life of the sub-pixel having an increased area may increase. In addition, the sub-pixel including a curve may disperse external light, and thus may reduce glare (e.g., glare seen by a user) due to external light. 
     In the above case, the planar shape of the first intermediate layer  28 - 2 A, the planar shape of the second intermediate layer  28 - 2 B, and the planar shape of the third intermediate layer  28 - 2 C may correspond to the planar shape of the first sub-pixel F 1 , the planar shape of the second sub-pixel F 2 , and the planar shape of the third sub-pixel F 3 , respectively. 
       FIG. 40  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 40 , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of the display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. In this case, the plurality of sub-pixels may be arranged in the same manner as or similar to those shown in  FIG. 10 . 
     A spacer P may be arranged between the plurality of sub-pixels as described above. In this case, the position of the spacer P is not limited to that shown in  FIG. 40  and may be arranged in any suitable manner between sub-pixels adjacent to each other. The edge of the planar shape of the spacer P may be determined according to (e.g., may correspond to) one side (e.g., a side facing the spacer P) of the planar shape of a sub-pixel adjacent to the spacer P. 
     In the above case, in at least one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , at least one side of the edge of the planar shape thereof may have a curved shape. In this case, in the at least one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , at least one side of the edge of the planar shape thereof may have a concave shape or a convex shape. 
     In the above case, the first side S 1  and the second side S 2  of the first sub-pixel F 1  may each have a linear shape, and the third side S 3  and the fourth side S 4  may each have a concave curved shape. Furthermore, the sixth side S 6  of the second sub-pixel F 2  may be convex curved, and the fifth side S 5 , the seventh side S 7 , and the eighth side S 8  may each be straight. The twelfth side S 12  of the third sub-pixel F 3  may have a convex curved shape, and the ninth side S 9 , the tenth side S 10 , and the eleventh side S 11  may each have a linear shape. The planar shape of each sub-pixel as described above is not limited thereto, and may include all cases (e.g., any suitable planar shape) in which at least one side of the planar shape of each sub-pixel is formed in a curved shape. 
     When each sub-pixel is arranged as described above, a sub-pixel having a protruding curve from among the sub-pixels may have an increased area in the pixel area AR compared to a sub-pixel in which the edge of the planar shape thereof is straight. In this case, the life of the sub-pixel having an increased area may increase. In addition, the sub-pixel having a curve may disperse external light, and thus may reduce glare due to external light. 
     In the above case, the planar shape of the first intermediate layer  28 - 2 A, the planar shape of the second intermediate layer  28 - 2 B, and the planar shape of the third intermediate layer  28 - 2 C may correspond to the planar shape of the first sub-pixel F 1 , the planar shape of the second sub-pixel F 2 , and the planar shape of the third sub-pixel F 3 , respectively. 
       FIG. 41  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 41 , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of the display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. In this case, the plurality of sub-pixels may be arranged in the same manner as or similar to those shown in  FIG. 39 . However, in  FIG. 41 , a chamfered portion of a corner portion of each sub-pixel may be different from that in  FIG. 39 . 
     A spacer P may be arranged between the plurality of sub-pixels as described above. In this case, the position of the spacer P is not limited to that shown in  FIG. 41  and may be arranged in any suitable manner between sub-pixels adjacent to each other. The edge of the planar shape of the spacer P may be determined according to (e.g., may correspond to) one side (e.g., a side facing the spacer) of the planar shape of a sub-pixel adjacent to the spacer P. 
     In the above case, in at least one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , at least one side of the edge of the planar shape thereof may have a curved shape. In this case, in the at least one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , at least one side of the edge of the planar shape thereof may have a concave shape or a convex shape. 
     In the above case, the first side S 1  and the second side S 2  of the first sub-pixel F 1  may each have a linear shape, and the third side S 3  and the fourth side S 4  may each have a concave curved shape. Furthermore, the sixth side S 6  of the second sub-pixel F 2  may be convex curved, and the fifth side S 5 , the seventh side S 7 , and the eighth side S 8  may each be straight. The twelfth side S 12  of the third sub-pixel F 3  may have a convex curved shape, and the ninth side S 9 , the tenth side S 10 , and the eleventh side S 11  may each have a linear shape. The planar shape of each sub-pixel as described above is not limited thereto, and may include all cases (e.g., any suitable planar shape) in which at least one side of the planar shape of the sub-pixel is formed in a curved shape. 
     When each sub-pixel is arranged as described above, a sub-pixel including a protruding curve from among the sub-pixels may have an increased area in the pixel area AR compared to a sub-pixel in which the edge of the planar shape thereof is straight. In this case, the life of the sub-pixel having an increased area may increase. In addition, the sub-pixel including a curve may disperse external light, and thus may reduce glare due to external light. 
     In the above case, the planar shape of the first intermediate layer  28 - 2 A, the planar shape of the second intermediate layer  28 - 2 B, and the planar shape of the third intermediate layer  28 - 2 C may correspond to the planar shape of the first sub-pixel F 1 , the planar shape of the second sub-pixel F 2 , and the planar shape of the third sub-pixel F 3 , respectively. 
       FIG. 42  is a plan view illustrating a first sub-pixel, a second sub-pixel, and a third sub-pixel of a display device according to another embodiment. 
     Referring to  FIG. 42 , a plurality of sub-pixels may be arranged to be spaced apart from each other in a display area of the display device. In this case, the plurality of sub-pixels may include a first sub-pixel F 1 , a second sub-pixel F 2 , and a third sub-pixel F 3 . One selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit one selected from blue light, red light, and green light, and another one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit another one selected from blue light, red light, and green light. The remaining one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3  may emit the remaining one selected from blue light, red light, and green light. In this case, the plurality of sub-pixels may be arranged in the same manner as or similar to those shown in  FIG. 40 . However, each sub-pixel shown in  FIG. 42  may have a shape obtained by chamfering a corner portion of the sub-pixel shown in  FIG. 40 . 
     A spacer P may be arranged between the plurality of sub-pixels as described above. In this case, the position of the spacer P is not limited to that shown in  FIG. 42  and may be arranged in any suitable manner between sub-pixels adjacent to each other. The edge of the planar shape of the spacer P may be determined according to (e.g., may correspond to) one side (e.g., a side facing the spacer P) of the planar shape of a sub-pixel adjacent to the spacer P. 
     In the above case, in at least one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , at least one side of the edge of the planar shape thereof may have a curved shape. In this case, in the at least one selected from the first sub-pixel F 1 , the second sub-pixel F 2 , and the third sub-pixel F 3 , at least one side of the edge of the planar shape thereof may have a concave shape or a convex shape. 
     In the above case, the first side S 1  and the second side S 2  of the first sub-pixel F 1  may each have a linear shape, and the third side S 3  and the fourth side S 4  may each have a concave curved shape. Furthermore, the sixth side S 6  of the second sub-pixel F 2  may be convex curved, and the fifth side S 5 , the seventh side S 7 , and the eighth side S 8  may each be straight. The twelfth side S 12  of the third sub-pixel F 3  may have a convex curved shape, and the ninth side S 9 , the tenth side S 10 , and the eleventh side S 11  may each have a linear shape. The planar shape of each sub-pixel as described above is not limited thereto, and may include all cases (e.g., any suitable planar shape) in which at least one side of the planar shape of each sub-pixel is formed in a curved shape. 
     When each sub-pixel is arranged as described above, a sub-pixel including a protruding curve from among the sub-pixels may have an increased area in the pixel area AR compared to a sub-pixel in which the edge of the planar shape thereof is straight. In this case, the life of the sub-pixel having an increased area may increase. In addition, the sub-pixel including a curve may disperse external light, and thus may reduce glare due to external light. 
     In the above case, the planar shape of the first intermediate layer  28 - 2 A, the planar shape of the second intermediate layer  28 - 2 B, and the planar shape of the third intermediate layer  28 - 2 C may correspond to the planar shape of the first sub-pixel F 1 , the planar shape of the second sub-pixel F 2 , and the planar shape of the third sub-pixel F 3 , respectively. 
     In relation to the above, embodiments of the arrangement of each sub-pixel and the edge of the planar shape of each sub-pixel are not limited to the above cases, and may include all forms (e.g., all suitable arrangements and planar shapes) in which, as each sub-pixel has a polygonal shape with corners and a protruding portion with respect to a straight line connecting corners adjacent to each other (e.g., corners at ends of the protruding portion, for example, a protruding side), the planar area of each sub-pixel is further increased as compared to a case where each sub-pixel is formed in a polygonal shape (e.g., a polygonal shape without a protruding portion). 
     The display device according to embodiments may prevent or reduce glare by reducing external light reflection. The display device manufacturing apparatus according to embodiments may form various suitable layers on a display substrate through chambers arranged in an in-line form. 
     Furthermore, the mask assembly and the display device manufacturing apparatus according to embodiments may simplify a process and reduce a process time. 
     It should be understood that embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features and/or aspects within each embodiment should typically be considered as available for other similar features and/or aspects in other embodiments. While one or more embodiments have been described with reference to the drawings, it will be understood by those of ordinary skill in the art that various suitable changes in form and details may be made without departing from the spirit and scope as defined by the following claims and equivalents thereof.