Patent Publication Number: US-11656518-B2

Title: Display device

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This is a continuation application of U.S. patent application Ser. No. 16/657,442, filed Oct. 18, 2019 (now issued as U.S. Pat. No. 11,061,295), the disclosure of which is incorporated herein by reference in its entirety. U.S. patent application Ser. No. 16/657,442 claims priority to and benefit of Korean Patent Application No. 10-2018-0132038 under 35 U.S.C. § 119, filed on Oct. 31, 2018, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. 
    
    
     BACKGROUND 
     1. Field 
     The present disclosure relates to a display device. 
     2. Description of the Related Art 
     A display device such as a liquid crystal display (LCD) and an organic light emitting diode (OLED) display includes a display panel including a plurality of pixels displaying an image. Each pixel includes a pixel electrode applied with a data signal, and the pixel electrode is connected to at least one transistor to be applied with the data signal. Recently, various display devices having functions in addition to image display have been developed. 
     SUMMARY 
     A display device according to an exemplary embodiment of the present disclosure includes a first display area including a plurality of first pixel areas and a second display area including a plurality of second pixel areas and a plurality of light transmitting areas. Each of the plurality of first pixel areas includes at least one first pixel capable of displaying an image. Each of the plurality of second pixel areas includes at least one second pixel capable of displaying the image. The light transmitting area does not include a pixel capable of displaying the image and has higher light transmittance than the second pixel area, in the second display area. At least one of the plurality of light transmitting areas is between two second pixel areas adjacent in a first direction and At least one of the plurality of light transmitting areas is between two second pixel areas adjacent in a second direction different from the first direction. 
     The at least one second pixel may include an active pattern, a driving gate electrode, a driving voltage line, a pixel electrode, an emission layer, and a common electrode that are electrically connected to each other for displaying the image, and the light transmitting area may not include at least part of at least one of the active pattern, the driving gate electrode, the driving voltage line, the pixel electrode, the emission layer, and the common electrode so that the image cannot be displayed in the light transmitting area. 
     In the second display area, each of the plurality of second pixel areas and each of the plurality of light transmitting areas may be alternately arranged in the first direction and the second direction. 
     Each of the plurality of second pixel areas may include a first color pixel outputting a first color, a second color pixel outputting a second color different from the first color, and a third color pixel outputting a third color different from the first color and the second color. 
     The first color pixel, the second color pixel, and the third color pixel may have a same shape as each other and be arranged in a line in the second pixel area. 
     Each of the second pixel areas may include one of the first color pixel, one of the second color pixel, and one of the third color pixel. 
     At least two of the first color pixel, the second color pixel, and the third color pixel may have sizes that are different from each other. 
     Each of the plurality of second pixel areas may include only one pixel outputting one color. 
     A structure of each of the plurality of first pixel areas may be different from a structure of each of the plurality of second pixel areas, or a shape of each of the plurality of first pixel areas may be different from a shape of the second pixel area. 
     Each of the plurality of first pixel area and each of the plurality of second pixel areas may include a first color pixel outputting a first color, a second color pixel outputting a second color different from the first color, and a third color pixel outputting a third color different from the first color and the second color. Each of the plurality of first pixel areas may have at least two of the first color pixel, the second color pixel, and the third color pixel with different sizes from each other. 
     The first color pixel, the second color pixel, and the third color pixel may have a same shape as each other and are arranged in a line in the second pixel area. 
     The size of the second color pixel in each of the plurality of first pixel areas and the size of the second color pixel in each of the plurality of second pixel areas may be different from each other. 
     In each of the plurality of the second pixel areas, the first color pixel, the second color pixel, and the third color pixel may include a transistor, respectively, and in each of the plurality of second pixel areas, a channel length of a channel region of the transistor included in the second color pixel may be shorter than a channel length of a channel region of the transistor included in the first color pixel or the third color pixel. 
     In each of the plurality of second pixel areas, each of the first color pixel, the second color pixel, and the third color pixel may include a transistor, and in second pixel area, the channel width of the channel region of the transistor included in the second color pixel may be larger than the channel width of the channel region of the transistor included in the first color pixel or the third color pixel. 
     The first pixel and the second pixel may include a transistor, respectively, and the channel length of the channel region of the transistor included in the second color pixel may be shorter than the channel length of the channel region of the transistor included in the first color pixel. 
     The first pixel and the second pixel may include a transistor, respectively, and the channel width of the channel region of the transistor included in the second color pixel may be larger than the channel width of the channel region of the transistor included in the first color pixel. 
     A display device according to an exemplary embodiment includes: a first display area including a plurality of first pixel areas; and a second display area including a plurality of second pixel areas and a plurality of light transmitting areas. Each of the plurality of first pixel areas includes at least one first pixel to display an image. Each of the plurality of second pixel areas includes at least one second pixel to display the image, the light transmitting area does not include a pixel capable of displaying the image and has higher light transmittance than the second pixel area. A structure of each of the plurality of first pixel areas is different from a structure of each of the plurality of second pixel areas, or a shape of each of the plurality of first pixel areas is different from a shape of each of the plurality of second pixel areas. 
     A display device according to an exemplary embodiment includes: a first display area including a plurality of first pixel areas; and a second display area including a plurality of second pixel areas and a plurality of light transmitting areas. Each of the plurality of first pixel areas includes at least one first pixel to display an image. Each of the plurality of second pixel areas includes at least one second pixel to display the image. The light transmitting area does not include a pixel capable of displaying the image and has higher light transmittance than the second pixel area, the plurality of first pixels included in the first pixel area are arranged in a row direction. The plurality of second pixel areas form a plurality of first columns. The plurality of light transmitting areas form a plurality of second columns. The plurality of first columns and the plurality of second columns are alternately arranged in the first direction. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Features will become apparent to those of skill in the art by describing in detail exemplary embodiments with reference to the attached drawings in which: 
         FIG.  1   ,  FIG.  2   , and  FIG.  3    illustrate schematic layout views showing a display area of a display device according to an exemplary embodiment, 
         FIG.  4    illustrates a schematic cross-sectional view of a display device according to an exemplary embodiment, 
         FIG.  5    to  FIG.  12    illustrate layout views of a display area of a display device according to an exemplary embodiment, respectively, 
         FIG.  13    to  FIG.  20    illustrate views showing one pixel area of a display device according to an exemplary embodiment, respectively, 
         FIG.  21    to  FIG.  33    illustrate layout views of a display area of a display device according to an exemplary embodiment, respectively, 
         FIG.  34    and  FIG.  35    illustrate schematic layout views of a transistor in a display area of a display device according to an exemplary embodiment, respectively, 
         FIG.  36    illustrates a layout view of a display area of a display device according to an exemplary embodiment, 
         FIG.  37    illustrates a cross-sectional view of the display device shown in  FIG.  36    taken along a line Va-Vb, 
         FIG.  38    illustrates a layout view of three adjacent pixels of a display device according to an exemplary embodiment, and 
         FIG.  39    illustrates a cross-sectional view of the display device shown in  FIG.  38    taken along a line Vc-Vd. 
     
    
    
     DETAILED DESCRIPTION 
     Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, they may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey exemplary implementations to those skilled in the art. 
     In describing embodiments, parts that are not related to the description will be omitted. Like reference numerals generally designate like elements throughout the specification. 
     In addition, the size and thickness of each configuration shown in the drawings are arbitrarily shown for better understanding and ease of description, but embodiments are not limited thereto. In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. In the drawings, for better understanding and ease of description, the thicknesses of some layers and areas are exaggerated. 
     It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. Further, in the specification, the word “on” or “above” means positioned on or below the object portion, and does not necessarily mean positioned on the upper side of the object portion based on a gravitational direction. 
     In addition, unless explicitly described to the contrary, the word “comprise” and variations such as “comprises” or “comprising” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. 
     Throughout this specification, a plan view means a view when observing a surface parallel to two directions (e.g., a first direction DR 1  and a second direction DR 2 ) crossing each other, and a cross-sectional view means a view when observing a surface cut in a direction (e.g., a third direction) perpendicular to the surface parallel to the first direction DR 1  and the second direction DR 2 . Also, overlapping two constituent elements means that two constituent elements overlap in the third direction (e.g., a direction perpendicular to an upper surface of the substrate) unless stated otherwise. 
     Now, a structure of a display device according to an exemplary embodiment is described with reference to  FIG.  1    to  FIG.  4   .  FIG.  1   ,  FIG.  2   , and  FIG.  3    are schematic layout views showing a display area of a display device according to an exemplary embodiment.  FIG.  4    is a schematic cross-sectional view of a display device according to an exemplary embodiment. 
     Referring to  FIG.  1    to  FIG.  4   , a display area included in display devices  1000 ,  1000   a ,  1000   b , and  1000   c  according to an exemplary embodiment may include a first display area DA 1  as a region that may display an image and a second display area DA 2  capable of having functions other than, e.g., in addition to, displaying an image. 
     The second display area DA 2  may receive or emit more light of a different wavelength from light of the displayed image than the first display area DA 1 . For example, referring to  FIG.  4   , the display device  1000  according to an exemplary embodiment may include a display panel  30  and an optical member  500  behind the display panel  30 . A wavelength used by the optical member  500  may pass through the second display area DA 2  with higher light transmittance compared to the first display area DA 1 . 
     In the second display area DA 2 , a ratio of an area where the image may be displayed, i.e., a region occupied by the pixel area, may be smaller than a ratio of an area occupied by the pixel area in the first display area DA 1 . In particular, the second display area DA 2  includes the pixel area and the light transmitting area having a higher light transmittance than the pixel area. There is no pixel that may display the image in the light transmitting area. Here, the pixel means a unit region where light of an image for an input image signal is output. 
     Referring to  FIG.  1   , the second display area DA 2  may be enclosed, e.g., fully surrounded, by the first display area DA 1  and may be near one side of the display device  1000   a  in a plan view. That is, in a plan view, the second display area DA 2  may be between the second display area DA 2  and the edge of the display device  1000   a . For example, the second display area DA 2  may be near the top of the display device  1000   a  and may have a planar shape extending in the first direction DR 1  along most of the top edge of the display device  1000   a.    
     Referring to  FIG.  2   , the second display area DA 2  according to the present exemplary embodiment is the same as most of the exemplary embodiment shown in  FIG.  1   , but the first display area DA 1  may not be around at least one side of the second display area DA 2 . That is, in a plan view, one edge of the second display area DA 2  may match one edge of the display device  1000   b , e.g., the first display area D 1  may contact three sides of the second display area DA 2 . For example, when the second display area DA 2  is near the top edge of the display device  1000   b , the first display area DA 1  may not be above the second display area DA 2 . 
     Referring to  FIG.  3   , the second display area DA 2  according to the present exemplary embodiment is the same as the exemplary embodiment shown in  FIG.  2   , however the second display area DA 2  may be adjacent to a corner edge of the display device  1000   c  or may be near the corner edge. In a plan view, one edge of the second display area DA 2  may match one corner edge of the display device  1000   c , e.g., the first display area D 1  may contact only two sides of the second display area DA 2 . For example, when the second display area DA 2  is near the top corner of the display device  1000   c , one edge of the second display area DA 2  may match the edge of one corner above the first display area DA 1 . 
     In addition, the second display area DA 2  may be in various positions in the display area of the display device and may have various planar shapes. For example, the second display area DA 2  may have a circular planar shape near the top edge of the display device. 
     Referring to  FIG.  4   , the display panel  30  included in the display device  1000  may include a substrate  10  in the first display area DA 1  and the second display area DA 2  described above. That is, the substrate  10  may be continuous. 
     A plurality of pixels PX may be between the substrate  10  and an encapsulation substrate  20 . A sealant  310  between the substrate  10  and the encapsulation substrate  20  may be further at the edge of the display panel  30 . The optical member  500  may be below the display panel  30 . The optical member  500  may be a camera, a flash, a sensor, and the like. 
     The optical member  500  may emit light of a predetermined wavelength range toward an object  600  or may receive light reflected from the object  600 . The light of the predetermined wavelength may be light of a wavelength other than a visible light used by the pixels PX to display the image. The light of the predetermined wavelength may pass mainly through the light transmitting area in the second display area DA 2 . When the optical member  500  is an infrared camera, the light of the predetermined wavelength may be infrared light, e.g., 900 nm to 1000 nm. 
     The optical member  500  may correspond to the entire second display area DA 2  in a plan view or may only correspond to a part of the second display area DA 2 . For example, the optical member  500  may correspond to the part among the second display area DA 2  shown in  FIG.  1   . 
     The first display area DA 1  and the second display area DA 2  of the display device according to an exemplary embodiment are now described with reference to  FIG.  5    to  FIG.  20    along with the above-described drawings.  FIG.  5    to  FIG.  12    are layout views of the first display area DA 1  and the second display area DA 2  of the display device according to an exemplary embodiment, and  FIG.  13    to  FIG.  20    show one pixel area of a display device according to an exemplary embodiment. 
     The first display area DA 1  may include a plurality of pixel areas PU 1 , and the second display area DA 2  may include a plurality of pixel areas PU 2  and light transmitting areas TA. 
     In the first display area DA 1 , a plurality of pixel areas PU 1  may be arranged in a matrix form, e.g., in a first direction DR 1  and a second direction DR 2 , which are different directions, or in two diagonal directions intersecting each other in rows and columns. In the second display area DA 2 , the plurality of pixel areas PU 2  and light transmitting areas TA may also be arranged, e.g., in a matrix, or may be variously arranged. Here, the diagonal direction means a direction intersecting both the first direction DR 1  and the second direction DR 2 . 
     Each of the pixel areas PU 1  and PU 2  may contain a plurality of pixels or one pixel. The structure and/or shape of the pixel area PU 1  and the structure and/or shape of the pixel area PU 2  may be the same or different. In the first display area DA 1 , the structures of two neighboring pixel areas PU 1  may be the same or different. In the second display area DA 2 , the structures of two neighboring pixel areas PU 2  may be the same or different. For example, the structure of two pixel areas PU 1  neighboring in the row or column direction in the first display area DA 1  may be symmetrical to each other and the structure of two pixel areas PU 2  neighboring in the row or column direction in the second display area DA 2  may be symmetrical to each other. 
       FIG.  13    to  FIG.  20    show examples of the pixel areas PU 1  and PU 2 , respectively. 
     Referring to  FIG.  13    to  FIG.  18   , each pixel area PU 1  and/or pixel area PU 2  may include a plurality of pixels that may output different colors. The color output by the plurality of pixels included in the pixel areas PU 1  and PU 2  may be three primary colors of red, green, and blue, or four primary colors, or the colors of the cyan, magenta, yellow, and/or white. For example, each pixel area PU 1  and/or pixel area PU 2  may include a red pixel (R), a green pixel (G), and a blue pixel (B). A combination that can output white light, e.g., containing at least one of the red pixel (R), the green pixel (G), and the blue pixel (B) as a combination outputting full colors of the image, is called a dot. 
       FIG.  13    to  FIG.  15    and  FIG.  17    shows an example where each pixel area PU 1  and/or pixel area PU 2  includes one red pixel (R), one green pixel (G), and one blue pixel (B). 
     In the exemplary embodiment shown in  FIG.  13   , each pixel R, G, and B included in one pixel area PUa may be of the same shape, e.g., an approximate rectangle, and may be arranged in a line in one direction. 
     In the exemplary embodiment shown in  FIG.  14   , each pixel R, G, and B included in one pixel area PUb may be an approximate rectangle. Two pixels of the three pixels R, G, and B, for example the red pixel (R) and the green pixel (G) are arranged vertically adjacent to each other, and the remaining green pixel (G) may be along the vertical direction at one side of the red pixel (R) and the green pixel (G). Each red pixel (R) and green pixel (G) may be along the horizontal direction. 
     Each pixel R, G, and B included in one pixel area PUc in the exemplary embodiment shown in  FIG.  15    may form an approximate rhombus shape. The sizes of the red pixel (R), the green pixel (G), and the blue pixel (B) may be different from each other. For example, the blue pixel (B) is the largest and the green pixel (G) is the smallest. 
       FIG.  16    shows an example in which each pixel area PU 1  and/or pixel area PU 2  includes one red pixel (R), one blue pixel (B), and two green pixels (G). Each pixel R, G, and B contained in a single pixel area PUd may be roughly rhombus-shaped. The sizes of the red pixel (R), the green pixel (G), and the blue pixel (B) may be different. For example, the blue pixel (B) is the largest and the green pixel (G) is the smallest. 
       FIG.  17    and  FIG.  18    are the same as most of the exemplary embodiment shown in  FIG.  15    and  FIG.  16   , respectively, however the position of the red pixel (R) and the blue pixel (B) included in one pixel area PUe and PUf may be opposite to the position of the red pixel (R) and the blue pixel (B) in the pixel area PUc and PUd shown in  FIG.  15    and  FIG.  16   . 
     Referring to  FIG.  19    and  FIG.  20   , each pixel area PU 1  and/or pixel area PU 2  may only include one pixel outputting a single color. For example,  FIG.  19    and  FIG.  20    show an example in which one pixel area PUg and PUh includes only one pixel, e.g., only the red pixel (R), and each pixel area PUg and PUh may include only the green pixel (G) or only the blue pixel (B). In this case, the second display area DA 2  may display the single color among red, green, or blue. Referring to  FIG.  19   , the pixel (R) included in one pixel area PUg may be roughly rhombus-shaped. Referring to  FIG.  20   , the pixel (R) included in one pixel area PUh may be approximately rectangular. 
     In the exemplary embodiments shown in  FIG.  13    to  FIG.  20   , the red pixel (R), the green pixel (G), and the blue pixel (B) the arrangement, number, and order or the pixels may vary. For example, in the exemplary embodiment shown in  FIG.  16   , the order of the red pixel (R), the green pixel (G), the blue pixel (B), and the green pixel (G) from the left is shown, however the order of the red pixel (R), the blue pixel (B), the green pixel (G), and the blue pixel (B) may be configured differently. 
     Again referring to  FIG.  5   , in the second display area DA 2 , the light transmitting area TA may be between two pixel areas PU 2  adjacent in the first direction DR 1 , the second direction DR 2 , and the diagonal direction. That is, the pixel area PU 2  and the light transmitting area TA may be alternately arranged in the first direction DR 1 , the second direction DR 2 , and the diagonal direction. 
     As described above, the light transmitting area TA has higher light transmittance than the pixel area PU 2  and does not have a pixel, i.e., an image display unit capable of outputting light to display an image. The pixel areas PU 1  and PU 2  may each contain at least one pixel. 
     In detail, one pixel may include at least one transistor connected to the signal line and a light-emitting element electrically connected to the transistor. The light-emitting element may be a light emitting diode (LED) including a pixel electrode, a common electrode, and an emission layer between the pixel electrode and the common electrode. The pixel areas PU 1  and PU 2  include at least one transistor and light-emitting element, however the light transmitting area TA may not include at least one of the transistor, the pixel electrode, the common electrode, and the emission layer, so as not to display the image in accordance with an input image signal. Thus, the light transmitting area TA has a higher light transmittance than the pixel areas PU 1  and PU 2 . 
     The planar size of the light transmitting area TA between two adjacent pixel areas PU 2  may be similar, larger, or smaller than the planar size of one pixel area PU 2 . The planar size of the light transmitting area TA may be larger than the planar size of one pixel. 
     A common electrode  270  (see  FIG.  37   ) may be in the first display area DA 1  and the second display area DA 2  of the display device according to an exemplary embodiment. The common electrode  270  of the first display area DA 1  and the common electrode  270  of the second display area DA 2  may be connected to each other as one electrode, and may transmit a constant common voltage. The common electrode  270  in the first display area DA 1  may be formed continuously as one electrode without a cutout, an opening, a pattern, and the like. The common electrode in the second display area DA 2  may include an opening corresponding to at least a portion of the light transmitting area TA so that the light transmitting area TA may not output light and may have the higher light transmittance due to the absence of the common electrode  270 . 
     When the light is emitted from the optical member  500  behind the display panel or is incident to the optical member  500  through the display panel, since the light transmittance is high in the light transmitting area TA, a recognition rate and sensing accuracy of the object  600  to be recognized by the optical member  500  may be increased. 
     In the second display area DA 2 , the light transmitting area TA and the pixel area PU 2  may be arranged in a regular arrangement, may display the image like the first display area DA 1 , and may have other functions by using the optical member  500 . 
     The resolution of the second display area DA 2  may be lower than the resolution of the first display area DA 1 . However, since the pixel area PU 2  and the light transmitting area TA are alternately arranged in the second display area DA 2 , the displayed image may not be unduly deteriorated. Particularly, like  FIG.  13   ,  FIG.  14   ,  FIG.  15   , or  FIG.  17   , when the pixel area PU 2  of the second display area DA 2  includes one red pixel (R), one green pixel (G), and one blue pixel (B), the plane shape of a pixel area PU 2  is almost square. Thus, if the pixel area PU 2  is alternately and regularly arranged with the light transmitting area TA, the light transmittance may be increased without deteriorating the quality of the displayed image. 
     Referring to  FIG.  5   , in the second display area DA 2 , the area of the light transmitting area TA between two pixel areas PU 2  adjacent in the first direction DR 1  and the second direction DR 2  may be equal to, similar to, or different from the area of one pixel area PU 2 . The area of the light transmitting area TA may vary in the several exemplary embodiments without being constant, but one light transmitting area TA having the area corresponding to one pixel area PU 2  is referred to as a unit light transmitting area TA. 
     Referring to  FIG.  6   , the display device according to the present exemplary embodiment is the same as most of the display device according to the exemplary embodiment shown in  FIG.  5   , except for the structure of the second display area DA 2 . The following description focuses on differences from the exemplary embodiment described above and omits the same description of the same constituent elements. 
     In the second display area DA 2 , the light transmitting area TA may be placed between two pixel areas PU 2  neighboring in the first direction DR 1  or the second direction DR 2 . That is, the pixel area PU 2  and the light transmitting area TA may be alternately arranged in the first direction DR 1  and the second direction DR 2 . In the diagonal direction, the plurality of pixel areas PU 2  may be arranged adjacent to each other. 
     Referring to  FIG.  7   , the display device according to the present exemplary embodiment is the same as most of the display device according to the exemplary embodiment shown in  FIG.  5   , except for the structure of the second display area DA 2 . In detail, in the second display area DA 2  shown in  FIG.  5   , the pixel areas PU 2  in the odd-numbered columns, e.g., first, third, fifth, etc., may be positioned by being shifted by one row, while alternating in the odd-numbered columns with the unit light transmitting areas TA. That is, the plurality of pixel areas PU 2  located in two neighboring columns may be arranged in a zigzag form, while the even-numbered columns, e.g., second, fourth, sixth, etc., may only include unit light transmitting areas TA. Thus, three unit light transmitting areas TA may be between two pixel areas PU 2  neighboring in the first direction DR 1 , and one unit light transmitting area TA may be between two pixel areas PU 2  neighboring in the second direction DR 2 . 
     Referring to  FIG.  8   , the display device according to the present exemplary embodiment is the same as most of the display device according to the exemplary embodiment shown in  FIG.  5   , except for the structure of the second display area DA 2 . 
     In the second display area DA 2 , the plurality of pixel areas PU 2  may be arranged in a plurality of columns C 1 , C 2 , C 3 , and C 4  separated from each other. A plurality of light transmitting areas TA may be includes columns between the plurality of columns C 1 , C 2 , C 3 , and C 4 , and separated from each other. The columns of the pixel area PU 2  and the columns of the light transmitting area TA may be alternately disposed. For example the columns of the pixel area PU 2  and the columns of the light transmitting area TA, each extending in the second direction DR 2 , may alternate along in the first direction DR 1 . In other words, the second pixels areas may form a plurality of first columns and the light transmitting areas TA may form a plurality of second columns, the first and second columns alternating along in the first direction DR 1 . 
     In particular, each of the columns C 1 , C 2 , C 3 , and C 4  of the pixel area PU 2 , may include a plurality of pixel areas PU 2  arranged in the second direction DR 2 . Between two adjacent columns C 1 , C 2 , C 3 , and C 4 , a plurality of unit light transmitting area TA arranged in the second direction DR 2  may be provided. In each of the columns C 1 , C 2 , C 3 , and C 4 , the light transmitting area TA may not be between two pixel areas PU 2  neighboring in the second direction DR 2 . 
     Referring to  FIG.  9   , the display device according to the present exemplary embodiment is the same as most of the display device according to the exemplary embodiment shown in  FIG.  8   , except for the structure of the second display area DA 2 . 
     In the second display area, each of the plurality of columns C 1 , C 2 , and C 3  arranged in the second direction DR 2  may include a plurality of pixel areas PU 2  and a plurality of unit light transmitting areas TA arranged in the zigzag shape in the left and right directions. In each column C 1 , C 2 , and C 3 , a pair of the left pixel area PU 2  and the right unit light transmitting area TA, and a pair of the left unit light transmitting area TA and the right pixel area PU 2  may be alternately arranged in the second direction DR 2 . The plurality of unit light transmitting areas TA arranged in the second direction DR 2  or one continuous light transmitting area TA extending along in the second direction DR 2  may be between two neighboring columns of C 1 , C 2 , and C 3 . 
     Referring to  FIG.  10   , the display device according to the present exemplary embodiment is the same as most of the display device according to the exemplary embodiment shown in  FIG.  9   , except for the structure of the second display area DA 2 . 
     In the second display area DA 2 , each of the plurality of columns C 1 , C 2 , and C 3  may include the plurality of pixel areas PU 2  arranged in the second direction DR 2  with the zigzag in the right and left directions, and two pixel areas PU 2  neighboring in the second direction DR 2  may partially overlap in the second direction DR 2 . That is, in each column C 1 , C 2 , and C 3 , two pixel areas PU 2  in adjacent rows may share a part of the edge. Thus, the width of one column of C 1 , C 2 , and C 3  in the first direction DR 1  may be less than the width of one column of C 1 , C 2 , and C 3  in the first direction DR 1  than in the exemplary embodiment shown in  FIG.  9   . 
     A plurality of unit light transmitting area TA forming one column may be between two adjacent columns of C 1 , C 2 , and C 3 . The plurality of unit light transmitting areas TA in one column may be protrude in the right and left directions along the first direction DR 1  with the zigzag shape. Two unit light transmitting area TA neighboring in the second direction DR 2  may partially overlap in the second direction DR 2 . That is, in each column, the unit light transmitting areas TA adjacent in the second direction DR 2  may partially share edges. 
     Referring to  FIG.  11   , the plurality of adjacent pixel areas PU 2  form one group, and the plurality of groups may be arranged to be separated from each other in the first direction DR 1  and the second direction DR 2  via the light transmitting area TA.  FIG.  11    shows an example in which one group includes two pixel areas PU 2  adjacent in the second direction DR 2  and are separated along the first direction Dr 1  by a column of unit light transmitting areas TA and along the second direction DR 2  by a row of unit light transmitting areas TA. 
     Referring to  FIG.  12   , the display device according to the present exemplary embodiment is the same as most of the display device according to the exemplary embodiment shown in  FIG.  11   , however one group arranged to be separated from each other via the light transmitting area TA includes two pixel areas PU 2  adjacent in the first direction DR 1 . The two pixel areas PU 2  adjacent in the first direction DR 1  are separated along the first direction DR 1  by a column of unit light transmitting areas TA and along the second direction DR 2  by a row of unit light transmitting areas TA 
     The detailed structure of the first display area DA 1  and the second display area DA 2  of the display device according to an exemplary embodiment is described with reference to  FIG.  21    to  FIG.  35    along with the above-described exemplary embodiments.  FIG.  21    to  FIG.  33    are layout views of a display area of a display device according to an exemplary embodiment, respectively.  FIG.  34    and  FIG.  35    are schematic layout views of a transistor in a display area of a display device according to an exemplary embodiment, respectively. 
     Referring to  FIG.  21   , a part of the plurality of pixel areas PU 1  included in the first display area DA 1  of the display device according to an exemplary embodiment is the pixel area PUd of  FIG.  16    as above-described, and the remaining part may be the same as the pixel area PUf of  FIG.  18   . In detail, in the first display area DA 1 , the pixel area PUd and the pixel area PUf are alternately arranged in the second direction DR 2 , the pixel area PUd is repeatedly arranged in the first direction DR 1  in each row, or the pixel area PUf is repeatedly arranged in the first direction DR 1 . 
     In other words, in the first display area DA 1 , the red pixel (R) and the blue pixel (B) are alternately arranged in the first direction DR 1  and the second direction DR 2 , the red pixel (R) and the green pixel (G) are alternately arranged in one diagonal direction, and the blue pixel (B) and the green pixel (G) are alternately arranged in the other diagonal direction. 
     Referring to  FIG.  22   , the plurality of pixel areas PU 1  included in the first display area DA 1  of the display device according to an exemplary embodiment may be the pixel area PUa shown in  FIG.  13    as above-described. Specifically, the red pixels (R) may be arranged in the second direction DR 2  in the pixel column containing the red pixel (R), the green pixels (G) may be arranged in the second direction DR 2  in the pixel column containing the green pixel (G), and the blue pixels (B) may be arranged in the second direction DR 2  in the pixel column containing the blue pixel (B). The pixel column containing the red pixel (R), the pixel column containing the green pixel (G), and the pixel column containing the blue pixel (B) may be repeatedly arranged in the first direction DR 1 . 
     Referring to  FIG.  23   , the second display area DA 2  of the display device according to an exemplary embodiment may include the part adjacent to the first display area DA 1 . As explained earlier, the structure or shape of the pixel area PU 1  of the first display area DA 1  and the structure or shape of the pixel area PU 2  of the second display area DA 2  may be different or the same.  FIG.  23    shows an example in which the structure or shape of the pixel area PU 1  of the first display area DA 1  and the structure or shape of the pixel area PU 2  of the second display area DA 2  are different. 
     The first display area DA 1  may have the same structure as the exemplary embodiment of  FIG.  21    as above-described. The plurality of pixel areas PU 2  included in the second display area DA 2  may include the pixel areas PUc and PUe shown in  FIG.  15    or  FIG.  17    as above-described. The arrangement shape of the pixel area PU 2  and the light transmitting area TA of the second display area DA 2  may be the same as the exemplary embodiment of  FIG.  5    as above-described. 
     A distance W 1  between two pixel areas PU 2  adjacent in the first direction DR 1  via the light transmitting area TA in the second display area DA 2  may be the same as or different from the width of one pixel area PU 2  in the first direction DR 1 . The distance W 2  between two pixel areas PU 2  adjacent in the second direction DR 2  via the light transmitting area TA may be the same as or different from the width of one pixel area PU 2  in the second direction DR 2 . Also, the distance W 1  may be greater than or the same as the distance W 2 , but is not limited to this, and they may be the same. 
     The display device according to an exemplary embodiment may include a plurality of data lines  171  transmitting the data signals. Each data line  171  may extend long in the second direction DR 2 , for example, and one data line  171  may pass both of the first display area DA 1  and the second display area DA 2 . 
     For example, the leftmost data line  171  may be connected to the transistors of the corresponding pixels (R and B) while passing through the red pixel (R) and the blue pixel (B) alternately arranged in the second direction DR 2  in the first display area DA 1 , and this data line  171  may be connected to the transistor of the corresponding red pixel (R) while passing through the red pixel (R) of the pixel area PU 2  in the second display area DA 2 . 
     In the left side, the second data line  171  may be connected to the transistor of the corresponding green pixel (G) while passing through the green pixel (G) arranged in the second direction DR 2  in the first display area DA 1 , and this data line  171  may be connected to the transistor of the corresponding green pixel (G) while passing through the green pixel (G) of the pixel area PU 2  in the second display area DA 2 . 
     In the left side, the third data line  171  may be connected to the transistors of the corresponding pixels (B and R) while passing through the blue pixel (B) and the red pixel (R) alternately arranged in the second direction DR 2  in the first display area DA 1 , and this data line  171  may be connected to the transistor of the corresponding blue pixel (B) while passing through the blue pixel (B) of the pixel area PU 2  in the second display area DA 2 . 
     In the left side, the fourth data line  171  may be connected to the transistor of the corresponding pixel (G) while passing through the green pixel (G) arranged in the second direction DR 2  in the first display area DA 1 , and this data line  171  may or may not be connected to the transistor while passing through light transmitting area TA in the second display area DA 2 . 
     By this method, the plurality of data lines  171  transmitting the data signal to the first display area DA 1  may also extend in the second display area DA 2  adjacent to the first display area DA 1 , thereby also transmitting the data signal to the pixel area PU 2  of the second display area DA 2 . If the transistor is formed in the light transmitting area TA, the data line  171  passing the light transmitting area TA of the second display area DA 2  may be connected to the transistor, however the normal pixel is not formed such that the light of the image may not be emitted. 
     Referring to  FIG.  24   , the first display area DA 1  of the display device according to an exemplary embodiment may be the same as that of the exemplary embodiment shown in  FIG.  23    or the exemplary embodiment shown in  FIG.  22    as above-described. The structure of such a first display area DA 1  may be equally applied to an exemplary embodiment to be described later. 
     The plurality of pixel areas PU 2  included in the second display area DA 2  according to an exemplary embodiment may include the pixel areas PUc and PUe shown in  FIG.  15    or  FIG.  17    as above-described. The arrangement shape of the pixel area PU 2  and the light transmitting area TA of the second display area DA 2  may be almost the same as the exemplary embodiment of  FIG.  10    described above. 
     The pixel area PU 2  may be formed with the zigzag in the right and left directions while being toward the second direction DR 2  and the green pixel (G) may be on the boundary between two pixel areas PU 2  adjacent in the second direction DR 2 . 
     Next, referring to  FIG.  25   , the part of the plurality of pixel areas PU 2  included in the second display area DA 2  of the display device according to an exemplary embodiment may be the pixel area PUc of  FIG.  15    above, and the remaining part may be the pixel area PUe shown in  FIG.  17   . The arrangement shape of the pixel area PU 2  and the light transmitting area TA of the second display area DA 2  may be almost the same as the exemplary embodiment of  FIG.  6    described above. 
     In the second display area DA 2 , the plurality of light transmitting areas TA may be regularly arranged to be separated in the first direction DR 1  and the second direction DR 2 . 
     Next, referring to  FIG.  26   , the plurality of pixel areas PU 2  included in the second display area DA 2  of the display device according to an exemplary embodiment may be the pixel areas PUd and PUf of  FIG.  16    or  FIG.  18    described above. The arrangement shape of the pixel area PU 2  and the light transmitting area TA of the second display area DA 2  may be almost the same as the exemplary embodiment of  FIG.  5    described above. 
     Next, referring to  FIG.  27   , the plurality of pixel areas PU 2  included in the second display area DA 2  of the display device according to an exemplary embodiment may be the pixel area PUa shown in  FIG.  13    described above. The arrangement shape of the pixel area PU 2  and the light transmitting area TA of the second display area DA 2  may be almost the same as the exemplary embodiment of  FIG.  6    described above. 
     Next, referring to  FIG.  28   , the plurality of pixel areas PU 2  included in the second display area DA 2  of the display device according to an exemplary embodiment may include the pixel area PUa of  FIG.  13    described above. The arrangement shape of the pixel area PU 2  and the light transmitting area TA of the second display area DA 2  may be almost the same as the exemplary embodiment of  FIG.  12    described above. 
     The plurality of pixel areas PU 2  may be arranged while forming the plurality of columns C 1 , C 2 , and C 3 , and the plurality of unit light transmitting areas TA arranged in the second direction DR 2  or the light transmitting area TA extending long in the second direction DR 2  may be between two adjacent columns of C 1 , C 2 , and C 3 . In each column C 1 , C 2 , and C 3 , the light transmitting area TA may also be between two pixel areas PU 2  adjacent in the second direction DR 2 . 
     Next, referring to  FIG.  29   , the plurality of pixel areas PU 2  included in the second display area DA 2  of the display device according to an exemplary embodiment may include the pixel area PUa of  FIG.  13    described above. The arrangement shape of the pixel area PU 2  and the light transmitting area TA of the second display area DA 2  may be almost the same as the exemplary embodiment of  FIG.  8    described above. 
     Next, referring to  FIG.  30   , the plurality of pixel areas PU 2  included in the second display area DA 2  of the display device according to an exemplary embodiment may include the pixel area PUb of  FIG.  14    described above. The arrangement shape of the pixel area PU 2  and the light transmitting area TA of the second display area DA 2  may be almost the same as the exemplary embodiment of  FIG.  6    described above. 
     Next, referring to  FIG.  31   , the plurality of pixel areas PU 2  included in the second display area DA 2  of the display device according to an exemplary embodiment may include the pixel area PUb of  FIG.  14    described above. The arrangement shape of the pixel area PU 2  and the light transmitting area TA of the second display area DA 2  may be almost the same as the exemplary embodiment of  FIG.  9    described above. 
     Next, referring to  FIG.  32   , the plurality of pixel areas PU 2  included in the second display area DA 2  of the display device according to an exemplary embodiment may include the pixel area PUb of  FIG.  14    described above. The arrangement shape of the pixel area PU 2  and the light transmitting area TA of the second display area DA 2  may be almost the same as the exemplary embodiment of  FIG.  8    described above. 
     Next, referring to  FIG.  33   , the shape and the arrangement shape of the pixel area PU 2  in the second display area DA 2  of the display device according to an exemplary embodiment may be almost the same as the several exemplary embodiments shown in  FIG.  23    to  FIG.  32    described above.  FIG.  33    shows an example in which the second display area DA 2  has the similar shape to the exemplary embodiment shown in  FIG.  23    described above. However, unlike the exemplary embodiment shown in  FIG.  23   , the planar size of the green pixel (G) included in the pixel area PU 2  according to the present exemplary embodiment may be extended more than the green pixel (G) of the exemplary embodiment shown in  FIG.  23    to be the same as, similar to, or slightly smaller than the planar size of the red pixel (R). 
     As above-described, to prevent the deterioration of the quality of the image, when the pixel area PU 2  of the second display area DA 2  includes one red pixel (R), one green pixel (G), and one blue pixel (B) to form the plane shape of one dot to be close to the square, if only one green pixel (G) having a relatively small size is included in one pixel area PU 2 , the lifetime of the green pixel (G) may be relatively low. However, according to the present exemplary embodiment, the size of the green pixel (G) is made equal to or similar to the size of the red pixel (R), thereby at least matching the lifetime of the green pixel (G) with that of the red pixel. 
       FIG.  34    shows a gate electrode  155   a  and an active pattern  131   a   2  of the transistor T 1  included in the pixel in the second display area DA 2 , and  FIG.  35    shows the gate electrode  155   a  and an active pattern  131   a   1  of the transistor T 1  included in the pixels R, G, and B in the first display area DA 1 . Part of the active patterns  131   a   1  and  131   a   2  overlapping the gate electrode  155   a  on a plane may form the channel region of the transistor T 1 , and the region except for the channel region of the active patterns  131   a   1  and  131   a   2  may form the source region or the drain region of the transistor T 1  as the conductive region. 
     Referring to  FIG.  34    and  FIG.  35   , the channel length Lch 2  of the channel region of the transistor T 1  in the second display area DA 2  may be shorter than the channel length Lch 1  of the channel region of the transistor T 1  in the first display area DM. Additionally or separately, the channel width Wch 2  of the channel region of the transistor T 1  in the second display area DA 2  may be larger than the channel width Wch 1  of the channel region of the transistor T 1  in the first display area DA 1 . Thus, the magnitude of the driving current flowing through the transistor T 1  disposed in the second display area DA 2  may be larger than the driving current flowing through the transistor T 1  in the first display area DM. In each pixel R, G, and B, the transistor T 1  is connected to the light-emitting element such as the light emitting diode (LED) to flow the driving current to the light-emitting element, such that the light-emitting element may be emitted depending on the driving current. 
     As above-described, when the resolution of the second display area DA 2  is lower than the resolution of the first display area DA 1 , the luminance of the image displayed in the second display area DA 2  may be lower than the luminance of the image displayed in the first display area DM. However, according to the present exemplary embodiment, since the magnitude of the driving current flowing through the transistor T 1  in the second display area DA 2  is larger than the driving current flowing through the transistor T 1  in the first display area DA 1 , the luminance of the second display area DA 2  may be adjusted to be closer to the luminance of the first display area DA 1 , thereby improving the quality of the displayed image. 
     The exemplary embodiment shown in  FIG.  33    and the exemplary embodiment shown in  FIG.  34    and  FIG.  35    may be applied simultaneously to one display device or only one may be applied. 
     According to another exemplary embodiment, only the transistor T 1  of the green pixel (G) in the second display area DA 2  may have the structure of the  FIG.  34   , and the transistor T 1  of the red pixel (R) and the blue pixel (B) of the second display area DA 2  may have the structure of  FIG.  35   . In the pixel area PU 2  of the second display area DA 2 , as in  FIG.  15    or  FIG.  17    described above, the planar size of the green pixel (G) may be smaller than the planar size of the red pixel (R) or the blue pixel (B). According to the present exemplary embodiment, in the second display area DA 2 , the magnitude of the driving current flowing through the transistor T 1  and the light-emitting element of the green pixel (G) may be larger than the magnitude of the driving current flowing through the transistor T 1  and the light-emitting element of the red pixel (R) or the blue pixel (B), and in the second display area DA 2 , the luminance of the green pixel (G) may be adjusted to be similar to the luminance of the red pixel (R) or the blue pixel (B). Thus, the quality of the image in the second display area DA 2  may be improved. 
     The structure of an example in which the display device according to an exemplary embodiment is an emissive display is described with reference to  FIG.  36    and  FIG.  37    along with the above-described drawings.  FIG.  36    is a layout view of a display area of a display device according to an exemplary embodiment.  FIG.  37    is a cross-sectional view of the display device shown in  FIG.  36    taken along a line Va-Vb. 
     Referring to  FIG.  36   , the display device according to an exemplary embodiment may include a plurality of pixel circuit regions PXA in which the pixel circuits corresponding to the plurality of pixels R, G, and B are formed. The plurality of pixel circuit regions PXA may be arranged in the matrix shape in the first direction DR 1  and the second direction DR 2 . 
     Each pixel circuit region PXA may include a plurality of transistors T 1 , T 2 , T 3 , T 4 , T 5 , T 6 , and T 7  connected to a plurality of scan lines  151 ,  152 , and  152 ′, a control line  153 , the data line  171 , and a driving voltage line  172 . 
     The plurality of scan lines  151 ,  152 , and  152 ′ may transmit the scan signal. The scan line  152  may transmit the scan signal of the previous stage of the scan line  151 , and the scan line  152 ′ may transmit the scan signal of the next stage of the scan line  152 . A control line  153  may transmit the control signal, particularly a light emission control signal, capable of controlling the emission of the light emitting diode (LED) corresponding to the pixels R, G, and B. 
     The data line  171  may transmit the data signal Dm, and the driving voltage line  172  may transmit the driving voltage ELVDD. The driving voltage line  172  may include a plurality of expanding portions  178  extending in the first direction DR 1 . 
     Each channel of the plurality of transistors T 1 , T 2 , T 3 , T 4 , T 5 , T 6 , and T 7  may be formed in an active pattern  130 . The active pattern  130  may be curved in various shapes and may include a semiconductor material, e.g., an amorphous polysilicon or oxide semiconductor. For example, the transistor T 1  may include a channel region  131   a  of the active pattern  130  that is curved at least once. The transistor T 1  shown in  FIG.  34    and  FIG.  35    as above-described may be a transistor of the same kind as the transistor T 1  shown in  FIG.  36    and  FIG.  37   . 
     The display device according to an exemplary embodiment may include a plurality of pixel electrodes  191   a ,  191   b , and  191   c , and a voltage line  192  corresponding to each pixel circuit region PXA. Each pixel electrode  191   a ,  191   b , and  191   c  may correspond to each pixel R, G, and B. The pixel electrode  191   a  of the red pixel (R) may be smaller than the pixel electrode  191   c  of the blue pixel (B), and the pixel electrode  191   b  of the green pixel (G) may be smaller than the pixel electrode  191   a  of the red pixel (R). 
     The voltage line  192  may be curved according to the edge of the adjacent pixel electrodes  191   a ,  191   b , and  191   c , and may transmit a predetermined voltage, e.g., an initialization voltage capable of initializing one node of the pixel circuit regions PXA. 
     The cross-sectional structure of the display device according to an exemplary embodiment is described with reference to  FIG.  37    along with  FIG.  36   . 
     The display device according to an exemplary embodiment may include a substrate  110 . A buffer layer  120  of an insulating material may be on the substrate  110 , and the active pattern  130  may be thereon. The active pattern  130  may include channel regions  131   a ,  131   b , and  131   f , and a conductive region  131 . The conductive region  131  may be on both sides of each of the channel regions  131   a ,  131   b , and  131   f , and may be the source region and the drain region of the corresponding transistor. A gate insulating layer  140  may be on the active pattern  130 . 
     A first conductive layer including the plurality of scan lines  151 ,  152 , and  152 ′, the control line  153 , and the driving gate electrode  155   a  may be on the gate insulating layer  140 . The scan line  151  may comprise a gate electrode  155   b  overlapping the channel region  131   b , and the scan line  153  may comprise a gate electrode  155   f  overlapping the channel region  131   f.    
     An interlayer insulating layer  160  may be on the first conductive layer and the gate insulating layer  140 . 
     At least one among the buffer layer  120 , the gate insulating layer  140 , and the interlayer insulating layer  160  may include an inorganic insulating material, e.g., a silicon nitride, a silicon oxide, a silicon oxynitride, or an organic insulating material. 
     The interlayer insulating layer  160  and the gate insulating layer  140  may include a contact hole  62  on the source region connected to the channel region  131   b  of the transistor T 2  of the conductive region  131  of the active pattern  130 , and a contact hole  66  on the drain region connected to the channel region  131   f  of the transistor T 6  of the conductive region  131  of the active pattern  130 . 
     A second conductive layer including the data line  171 , the driving voltage line  172 , and a connecting member  179  may be on the interlayer insulating layer  160 . The data line  171  may be connected to the source region connected to the channel region  131   b  of the transistor T 2  through the contact hole  62 . The expanding portion  178  of the driving voltage line  172  overlaps the driving gate electrode  155   a  via the interlayer insulating layer  160 , thereby forming a capacitor Cst. The connecting member  179  may be connected to the drain region connected to the channel region  131   f  of the transistor T 6  through the contact hole  66 . 
     At least one of the first conductive layer and the second conductive layer may include a metal, e.g., copper (Cu), aluminum (Al), molybdenum (Mo), titanium (Ti), tantalum (Ta), an alloy of at least two of these, and the like. 
     A passivation layer  180  may be on the second conductive layer and the interlayer insulating layer  160 . The passivation layer  180  may include an organic insulating material such as a polyacrylate resin and a polyimide resin, and an upper surface of the passivation layer  180  may be substantially flat. The passivation layer  180  may include a contact hole  81  on the connecting member  179 . 
     A third conductive layer including the pixel electrodes  191   a ,  191   b , and  191   c  and the voltage line  192  may be on the passivation layer  180 . Each pixel electrode  191   a ,  191   b , and  191   c  may be connected to the connecting member  179  through the contact hole  81 . The third conductive layer may include a semi-transmissive conductive material or a reflective conductive material. 
     An insulating layer  350  may be on the third conductive layer. The insulating layer  350  may include the organic insulating material and may have an opening  351  on each pixel electrodes  191   a ,  191   b , and  191   c.    
     An emission layer  370  may be on the pixel electrodes  191   a ,  191   b , and  191   c . The emission layer  370  may include a part in the opening  351  and a part on the insulating layer  350 . The emission layer  370  may include an organic emission material or an inorganic emission material. 
     The common electrode  270  may be on the emission layer  370  and the insulating layer  350 . The common electrode  270  may also be formed on the insulating layer  350 . The common electrode  270  may include a conductive transparent material. For example, the common electrode  270  may include silver (Ag). 
     A common layer, e.g., a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, and the like, may be between the insulating layer  350  and the common electrode  270 , between the emission layer  370  and the common electrode  270 , and/or between the emission layer  370  and the pixel electrodes  191   a ,  191   b , and  191   c . The common layer may be formed entirely in the first display area DA 1  and the second display area DA 2 . 
     Each pixel electrode  191   a ,  191   b , and  191   c , the emission layer  370 , and the common electrode  270  together form the light emitting diode (LED) ED of the light-emitting element. The common electrode  270  may be the cathode and the pixel electrodes  191   a ,  191   b , and  191   c  may be the anode, or vice versa. 
     The first display area DA 1  described above may have the structure shown in  FIG.  36    and  FIG.  37   . The plane structure and the cross-sectional structure of the pixel area PU 2  of the second display area DA 2  may have the part of the structure shown in  FIG.  36    and the cross-sectional stacking structure shown in  FIG.  37   . 
     In the light transmitting area TA of the second display area DA 2 , at least part of the configuration required for displaying the image of the structure shown in  FIG.  36    and  FIG.  37    is omitted. For example, at least part of at least one of the active pattern  130 , the driving gate electrode  155   a , the expanding portion  178  of the driving voltage line  172 , the pixel electrodes  191   a ,  191   b , and  191   c , the emission layer  370 , and the common electrode  270  may be omitted in the light transmitting area TA. Accordingly, the light transmittance in the light transmitting area TA may be higher than the light transmittance in the pixel area PU 1  and PU 2 . 
     Next, a structure of an example in which the display device according to an exemplary embodiment is a liquid crystal display is described with reference to  FIG.  38    and  FIG.  39    along with the above-described drawings.  FIG.  38    is a layout view of three adjacent pixels of a display device according to an exemplary embodiment.  FIG.  39    is a cross-sectional view of the display device shown in  FIG.  38    taken along a line Vc-Vd. 
     The display device according to an exemplary embodiment as the liquid crystal display may include a first display panel  100  and a second display panel  200 , and a liquid crystal layer  3  between two display panels  100  and  200  in a cross-sectional view, e.g., along the third direction DR 3 . 
     The above-described first display area DA 1  may include a plurality of pixels PXa, PXb, and PXc. The plurality of pixels PXa, PXb, and PXc may be repeatedly arranged in the first direction DR 1  and the second direction DR 2 . 
     The first display panel  100  may include a gate conductive layer including a gate line  121  on the substrate  110 , a storage electrode line  132 , and a dummy pattern  129 . 
     The gate line  121  may mainly extend in the first direction DR 1  and may transmit the gate signal. The gate line  121  may include a first gate electrode  124   a  and a second gate electrode in each pixel PXa, PXb, and PXc. 
     The storage electrode line  132  may include a transverse part  132   a  extending substantially parallel to the gate line  121 , and a longitudinal part  132   b  connected to the transverse part  131   a . The longitudinal part  132   b  of the storage electrode line  132  may extend along a boundary between two adjacent pixels of PXa, PXb, and PXc. 
     The dummy pattern  129  may be between the transverse part  132   a  of the adjacent storage electrode line  132  and the gate line  121 . Each dummy pattern  129  may have an island shape. 
     The gate insulating layer  140  may be on the gate conductive layer, and a semiconductor layer including a first semiconductor  154   a  and a second semiconductor may be thereon. The first semiconductor  154   a  may overlap the first gate electrode  124   a  and the second semiconductor may overlap the second gate electrode. The semiconductor layer may include amorphous silicon, polycrystalline silicon, a metal oxide, or the like. 
     Ohmic contacts (ohmic contact members)  163   a  and  165   a  may be on the semiconductor layer. A data conductive layer including a plurality of data lines, including a first data line  171   a  and a second data line  171   b , a plurality of first drain electrodes  175   a , and a plurality of second drain electrodes may be on the ohmic contacts  163   a  and  165   a.    
     The first data line  171   a  may include a first source electrode  173   a  overlapping the first gate electrode  124   a , and the second data line  171   b  may include a second source electrode overlapping the second gate electrode. 
     The first drain electrode  175   a  and the second drain electrode may respectively include an end portion of a rod type and an expanding portion  177   a  of a wide end portion. Each first drain electrode  175   a  may overlap the dummy pattern  129  of the gate conductive layer. 
     The first gate electrode  124   a , the first source electrode  173   a , and the first drain electrode  175   a  form the first transistor Qa along with the first semiconductor  154   a , and the second gate electrode, the second source electrode, and the second drain electrode form the second transistor Qb along with the second semiconductor. The first and second transistors Qa and Qb may function as switching elements for transferring the data voltage transmitted by the first and second data lines  171   a  and  171   b  according to a gate signal transmitted by the gate line  121 . 
     The region where the gate line  121 , the transverse part  132   a  of the storage electrode line  132 , and the first and second transistors Qa and Qb are disposed may be obscured by a light blocking member  220 . The light blocking member  220  may mainly extend to the first direction DR 1  to form a shading region of each pixel PXa, PXb, and PXc. 
     A first insulating layer  180   a  may be on the data conductive layer. The first insulating layer  180   a  may include the organic insulating material or the inorganic insulating material. 
     A plurality of color filters  230   a  and  230   b  may be on the first insulating layer  180   a . Each color filter  230   a  and  230   b  may include an opening  235   a  that overlaps the expanding portion  177   a  of the first and second drain electrodes  175   a , respectively. 
     A second insulating layer  180   b  may be on the color filters  230   a  and  230   b . The second insulating layer  180   b  may include the inorganic insulating material or the organic insulating material, and may have an almost planar top surface by particularly including the organic insulating material. 
     The first and second insulating layers  180   a  and  180   b  may include a contact hole  185   a  above the expanding portion  177   a  of the first drain electrode  175   a , and a contact hole above the expanding portion of the second drain electrode. A pixel electrode layer including the pixel electrode including a plurality of first sub-pixel electrodes  191   cc , a plurality of second sub-pixel electrodes  191   dd , and a shielding electrode  199 , may be on the second insulating layer  180   b.    
     Each overall shape of the first sub-pixel electrode  191   cc  and the second sub-pixel electrode  191   dd  may be quadrangular. The first sub-pixel electrode  191   cc  may include a cross-shaped stem part including a transverse stem part  192   c  extending along the first direction DR 1 , a longitudinal stem part  193   c  extending along the second direction DR 2 , and a plurality of branch parts  194   c  extending outside from the cross-shaped stem part along a diagonal direction. The second sub-pixel electrode  191   dd  may include a cross-shaped stem part including a transverse stem part  192   d  extending along the first direction DR 1 , a longitudinal stem part  193   d  extending along the second direction DR 2 , and a plurality of branch parts  194   d  extending outside from the cross-shaped stem part along a diagonal direction. 
     The first sub-pixel electrode  191   cc  may include an extending part  195   c  protruded toward the expanding portion  177   a  of the first drain electrode  175   a  and a contact portion  196   c  connected to the extending part  195   c  end, and the second sub-pixel electrode  191   dd  may include an extending part  195   d  protruded toward the extension part of the second drain electrode and a contact portion  196   d  connected to the extending part  195   d  end. The contact portion  196   c  is electrically connected to the expanding portion  177   a  of the first drain electrode  175   a  through the contact hole  185   a , and the contact portion  196   d  is electrically connected to the extension part of the second drain electrode through the contact hole. 
     The shielding electrode  199  extends between adjacent pixels PXa, PXb, and PXc in the first direction DR 1  and/or between adjacent pixels PXa, PXb, and PXc in the second direction DR 2 , thereby preventing coupling and light leakage between the adjacent pixels PXa, PXb, and PXc. 
     The pixel electrode layer may include a transparent conductive material such as indium-tin oxide (ITO), indium-zinc oxide (IZO), a metal thin film, and the like. 
     An alignment layer  11  may be on the pixel electrode layer and the second insulating layer  180   b . In the second display panel  200 , the light blocking member  220  may be on a substrate  210  (under the substrate  210  in  FIG.  3   ). A common electrode  271  may be on the light blocking member  220  (under the light blocking member  220  in  FIG.  3   ). The common electrode  271  may be formed on the entire surface of the substrate  210 . The common electrode  271  may transmit the common voltage. The common electrode  271  may include the transparent conductive material such as ITO, IZO, the metal thin film, and the like. An alignment layer  21  may be on the common electrode  271  (under the common electrode  271  in  FIG.  39   ). The liquid crystal layer  3  between the alignment layers  11  and  21  may include a plurality of liquid crystal molecules  31 . 
     The first display area DA 1  described above may have the structure shown in  FIG.  38    and  FIG.  39   . The plane structure and the cross-sectional stacking structure of the pixel area PU 2  of the second display area DA 2  may have the part of the structure shown in  FIG.  38    and the structure shown in  FIG.  39   . 
     In the light transmitting area TA of the second display area DA 2 , at least a part required for displaying the image among the structure shown in  FIG.  38    and  FIG.  39   , e.g., at least part of the semiconductor layer, the gate electrode  124   a , the drain electrode  175   a , the sub-pixel electrodes  191   cc  and  191   dd , and/or the common electrode  271 , may be removed. Accordingly, the light transmittance in the light transmitting area TA may be higher than the light transmittance in the pixel areas PU 1  and PU 2 . The substrate  110  may not be removed in the light transmitting area TA. 
     Exemplary embodiments of the present disclosure increase light transmittance of a display area corresponding to an optical member and improve display quality of an image displayed in a region of the display device having functions in addition to the image display. 
     Example embodiments have been disclosed herein, and although specific terms are employed, they are used and are to be interpreted in a generic and descriptive sense only and not for purpose of limitation. In some instances, as would be apparent to one of ordinary skill in the art as of the filing of the present application, features, characteristics, and/or elements described in connection with a particular embodiment may be used singly or in combination with features, characteristics, and/or elements described in connection with other embodiments unless otherwise specifically indicated. Accordingly, it will be understood by those of skill in the art that various changes in form and details may be made without departing from the spirit and scope of the present invention as set forth in the following claims.