Patent Publication Number: US-10769987-B2

Title: Display device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     Korean Patent Application No. 10-2016-0068357, filed on Jun. 1, 2016, and entitled, “Display Device,” is incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Field 
     One or more embodiments described herein relate to a display device. 
     2. Description of the Related Art 
     A variety of displays have been developed. Examples include liquid crystal displays and organic light emitting displays. The pixels of these and other types of displays are connected to driving wiring lines for displaying an image. The driving wiring lines may have different loads based on position. As a result, brightness deviation may occur among the pixels. 
     SUMMARY 
     In accordance with one or more embodiments, a display device includes first pixels in a first pixel region and connected to first scan lines; second pixels in a second pixel region having a width less than the first pixel region, the second pixels connected to second scan lines; a first scan driver to supply first scan signals to the first scan lines; a second scan driver to supply second scan signals to the second scan lines; a first signal line to supply a first driving signal to the first scan driver and the second scan driver; and a signal delay circuit connected to the first signal line to delay the first driving signal. 
     The signal delay circuit may operate while the second scan signals are supplied. A number of second pixels in horizontal lines of the second pixel region may be less than a number of first pixels in horizontal lines of the first pixel region. A length of the second scan lines may be less than a length of the first scan lines. The first driving signal may include at least one clock signal. 
     The first signal line may include a first clock signal line and a second clock signal line, and the first clock signal line and the second clock signal line may be connected to the signal delay circuit. The signal delay circuit may include a signal delay circuit element; and a signal delay control transistor to control electrical connection between the signal delay circuit element and the first signal line. The signal delay circuit element may include at least one of a resistor or a capacitor. 
     The signal delay control transistor may turn on and off based on a control signal from a timing controller. The signal delay control transistor may maintain an on state in a first period in which the second scan signals are supplied and may maintain an off state in a second period in which the first scan signals are supplied. The first scan driver may supply the first scan signals to the first scan lines based on the first driving signal in the second period, and the second scan driver may supply the second scan signals to the second scan lines based on the first driving signal delayed in the first period. 
     The display device may include third pixels in a third pixel region and connected to third scan lines; and a third scan driver, connected to the first signal line, to receive the first driving signal and to supply third scan signals to the third scan lines. The third pixel region may have a width less than the first pixel region, and the second pixel region and the third pixel region may be at one side of the first pixel region and separate from each other. The signal delay control transistor may maintain an on state in a first period in which the second scan signals and the third scan signals are supplied and may maintain an off state in a second period in which the first scan signals are supplied. 
     In accordance with one or more other embodiments, a display device includes first pixels in a first pixel region and connected to first scan lines; second pixels in a second pixel region having a width less than the first pixel region, the second pixels are connected to second scan lines; third pixels in a third pixel region having a width less than the second pixel region, the third pixels connected to third scan lines; a first scan driver to supply first scan signals to the first scan lines; a second scan driver to supply second scan signals to the second scan lines; a third scan driver to supply third scan signals to the third scan lines; a first signal line to supply a first driving signal to the first scan driver, the second scan driver, and the third scan driver; and a first signal delay circuit and a second signal delay circuit connected to the first signal line to delay the first driving signal. 
     The first signal delay circuit and the second signal delay circuit may operate in a first period in which the third scan signals are supplied. The first signal delay circuit may operate and the second signal delay circuit may stop operating in a second period in which the second scan signals are supplied. A number of third pixels in horizontal lines of the third pixel region may be less than a number of second pixels in horizontal lines of second pixel region, and a number of second pixels in horizontal lines of the second pixel region may be less than a number of first pixels provided in horizontal lines of the first pixel region. A length of the third scan lines may be less than a length of the second scan lines, and length of the second scan lines may be less than a length of the first scan lines. 
     The first signal delay circuit may include a first signal delay circuit element and a first signal delay control transistor to control electrical connection between the first signal delay circuit element and the first signal line, and the second signal delay circuit may include a second signal delay circuit element and a second signal delay control transistor to control electrical connection between the second signal delay element and the first signal line. 
     Each of the first signal delay circuit element and the second signal delay circuit element may include at least one of a resistor or a capacitor. The first signal delay control transistor and the second signal delay control transistor may maintain on states in a first period in which the third scan signals are supplied. The first signal delay control transistor may maintain an on state and the second signal delay control transistor may maintain an off state in a second period in which the second scan signals are supplied. 
     The first signal delay control transistor and second signal delay control transistor may maintain off states in a third period in which the first scan signals are supplied. The first period, the second period, and the third period may be sequential periods. 
    
    
     
       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  illustrates an embodiment of a substrate; 
         FIG. 2  illustrates another embodiment of a substrate; 
         FIG. 3  illustrates an embodiment of a display device; 
         FIG. 4  illustrates another embodiment of a display device; 
         FIG. 5  illustrates an embodiment of a first pixel; 
         FIG. 6  illustrates an embodiment of scan stages and a signal delay unit; 
         FIG. 7  illustrates an embodiment of a scan driver; 
         FIG. 8  illustrates an embodiment of a first gate control signal input to the scan stage and scan signals output from the scan stage of  FIG. 7 ; 
         FIG. 9  illustrates an embodiment of the scan stage of  FIG. 7 ; 
         FIG. 10  illustrates an embodiment of waveforms corresponding to a method for driving the scan stage of  FIG. 9 ; 
         FIG. 11  illustrates another embodiment of a substrate; 
         FIG. 12  illustrates another embodiment of a display device; 
         FIG. 13  illustrates another embodiment of scan stages and a signal delay unit; 
         FIG. 14  illustrates another embodiment of a substrate; and 
         FIG. 15  illustrates another embodiment of a display device. 
     
    
    
     DETAILED DESCRIPTION 
     Example embodiments will now be described 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. The embodiments (or portions thereof) may be combined to form additional embodiments. 
     In the drawings, the dimensions of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when a layer or element is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. Further, it will be understood that when a layer is referred to as being “under” another layer, it can be directly under, and one or more intervening layers may also be present. In addition, it will also be understood that when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present. Like reference numerals refer to like elements throughout. 
     When an element is referred to as being “connected” or “coupled” to another element, it can be directly connected or coupled to the another element or be indirectly connected or coupled to the another element with one or more intervening elements interposed therebetween. In addition, when an element is referred to as “including” a component, this indicates that the element may further include another component instead of excluding another component unless there is different disclosure. 
       FIG. 1  illustrates ab embodiment of a substrate  110  which may include pixel regions AA 1  and AA 2  and peripheral regions NA 1  and NA 2 . A plurality of pixels PXL 1  and PXL 2  are in the pixel regions AA 1  and AA 2  to display a predetermined image. Therefore, the pixel regions AA 1  and AA 2  may be referred to as display regions. 
     Elements (for example, wiring lines) for driving the pixels PXL 1  and PXL 2  may be in the peripheral regions NA 1  and NA 2 . Since the pixels PXL 1  and PXL 2  are not in the peripheral regions NA 1  and NA 2 , the peripheral regions NA 1  and NA 2  may be referred to as non-display regions. For example, the peripheral regions NA 1  and NA 2  may exist outside the pixel regions AA 1  and AA 2  and may surround at least parts of the pixel regions AA 1  and AA 2 . 
     The pixel regions AA 1  and AA 2  may include a first pixel region AA 1  and a second pixel region AA 2  at one side of the first pixel region AA 1 . The first pixel region AA 1  may have a larger area than the second pixel region AA 2 . The width W 1  of the first pixel region AA 1  may be greater than the width W 2  of the second pixel region AA 2 . The length L 1  of the first pixel region AA 1  may be greater than the length L 2  of the second pixel region AA 2 . 
     The peripheral regions NA 1  and NA 2  may include a first peripheral region NA 1  and a second peripheral region NA 2 . The first peripheral region NA 1  may be around the first pixel region AA 1  and may surround at least part of the first pixel region AA 1 . The second peripheral region NA 2  may be around the second pixel region AA 2  and surround part of the first pixel region AA 1  and at least a part of second pixel region AA 2 . 
     The pixels PXL 1  and PXL 2  may include first pixels PXL 1  and second pixels PXL 2 . For example, the first pixels PXL 1  are in the first pixel region AA 1  and the second pixels PXL 2  may be in the second pixel region AA 2 . The pixels PXL 1  and PXL 2  may emit light with predetermined brightness based on control signals output from one or more drivers. For this purpose, each of the pixels PXL 1  and PXL 2  may include a light emitting device (for example, an organic light emitting diode (OLED)). 
     On the other hand, in the first pixel region AA 1 , the same number of first pixels PXL 1  may be in each horizontal line. In addition, in the second pixel region AA 2 , the same number of second pixels PXL 2  may be in each horizontal line. 
     As described above, since the width W 1  of the first pixel region AA 1  is greater than the width W 2  of the second pixel region AA 2 , the number of first pixels PXL 1  in the horizontal lines of the first pixel region AA 1  may be greater than the number of second pixels PXL 2  in the horizontal lines of the second pixel region AA 2 . 
     The substrate  110  may have various shapes so that the above-described pixel regions AA 1  and AA 2  and peripheral regions NA 1  and NA 2  may be set. For example, in  FIG. 1 , a protrusion may extend from an upper portion of the substrate  110  in one direction. In this case, the second pixel region AA 2  and the second peripheral region NA 2  may be defined in the protrusion of the substrate  110 . 
     The substrate  110  may be formed of an insulating material such as glass and resin. In addition, the substrate  110  may be formed of a flexible material so as to be bent or curved and may has a single layer structure or a multilayer structure. For example, the substrate  110  may include at least one of polystyrene, polyvinyl alcohol, polymethyl methacrylate, polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, triacetate cellulose, or celluloseacetate propionate. The substrate  110  may be formed of various materials such as fiber glass reinforced plastic (FRP). 
       FIG. 2  illustrates another embodiment of a substrate  111  which may include pixel regions AA 1  and AA 2  and peripheral regions NA 1  and NA 2 . The pixel regions AA 1  and AA 2  may include a first pixel region AA 1  and a second pixel region AA 2  positioned at one side of the first pixel region AA 1 . The first pixel region AA 1  may have a greater area than the second pixel region AA 2 . 
     The second pixel region AA 2  may have a width that gradually reduces from one side adjacent to the first pixel region AA 1  to the other side remote from the first pixel region AA 1 . For example, the width W 2  of the other side of the second pixel region AA 2  may be less than the width W 1  of the first pixel region AA 1 . Also, the length L 2  of the second pixel region AA 2  may be less than the length L 1  of first pixel region AA 1 . 
     The peripheral regions NA 1  and NA 2  may include a first peripheral region NA 1  and a second peripheral region NA 2 . The first peripheral region NA 1  may be around the first pixel region AA 1  and may surround at least part of the first pixel region AA 1 . The second peripheral region NA 2  may be around the second pixel region AA 2  and may surround part of first pixel region AA 1  and at least part of the second pixel region AA 2 . 
     The pixels PXL 1  and PXL 2  may include first pixels PXL 1  and second pixels PXL 2 . For example, the first pixels PXL 1  are in the first pixel region AA 1  and the second pixels PXL 2  may be in the second pixel region AA 2 . In the first pixel region AA 1 , the same number of first pixels PXL 1  may be in each horizontal line. In the second pixel region AA 2 , the number of second pixels PXL 2  in each horizontal line may vary. For example, in the second pixel region AA 2 , a greater number of second pixels PXL 2  may be arranged in a horizontal line closer to the first pixel region AA 1 . 
     On the other hand, in  FIG. 2 , the second pixel region AA 2  may be formed in an upper portion of the substrate  111 . In another embodiment, the second pixel region AA 2  may be formed in a lower portion of the substrate  111  or in both upper and lower portions of the substrate  111 . In addition, the second pixel region AA 2  may be connected to a part of an upper side of the first pixel region AA 1 . 
       FIG. 3  illustrates an embodiment of a display device  100  which includes the substrate of  FIG. 1 . Referring to  FIG. 3 , the display device  100  may include the substrate  110 , the first pixels PXL 1 , the second pixels PXL 2 , and a display driver  200 . 
     The first pixels PXL 1  are in the first pixel region AA 1  and each of the first pixels PXL 1  may be connected to a first scan line S 1   i , a first emission control line E 1   i , and a data line D. 
     The second pixels PXL 2  are positioned in the second pixel region AA 2  and each of the second pixels PXL 2  may be connected to a second scan line S 2   i , a second emission control line E 2   i , and a data line D. 
     The data lines D connected to the second pixels PXL 2  may extend from the data lines D connected to the first pixels PXL 1 . On the other hand, according to the present invention, i is a natural number and, for example, reference numeral S 1   i  denotes an ith first scan line among first scan lines. 
     The display driver  200  may be connected to the substrate  110  through an additional element  120  such as a flexible printed circuit board (FPCB). For example, the display driver  200  may be connected to the substrate  110  by various methods such as a chip-on-glass method, a chip-on-plastic method, a tape carrier package method, or a chip-on-film method. 
     The display driver  200  may include drivers for controlling the pixels PXL 1  and PXL 2  to emit light. For example, the display driver  200  may include a scan driver for supplying scan signals to the ith first scan line S 1   i  and the ith second scan line S 2   i . In addition, the display driver  200  may include an emission control driver for supplying emission control signals to the ith first emission control line E 1   i  and the ith second emission control line E 2   i.    
     A data driver for supplying data signals to the pixels PXL 1  and PXL 2  through the data lines D may be in the display driver  200 . 
     In  FIG. 3 , the display driver  200  is separate from the substrate  110  is connected to the substrate  110 . In another embodiment, the entire display driver  200  or part of the display driver  200  may be directly mounted on the substrate  110  or may be in the first peripheral region NA 1  and the second peripheral region NA 2  of the substrate  110 . In this case, the drivers may be formed on the substrate  110  by the various methods such as the chip-on-glass method, the chip-on-plastic method, the tape carrier package method, or the chip-on-film method. 
       FIG. 4  illustrates another embodiment of a display device which may include the first pixels PXL 1 , the second pixels PXL 2 , and the display driver  200 . The display driver  200  may include a first scan driver  210 , a first emission control driver  220 , a second scan driver  213 , a second emission control driver  223 , a data driver  230 , a signal delay unit  240 , and a timing controller  250 . 
     The first pixels PXL 1  are in the first pixel region AA 1  divided by first scan lines S 11  through S 1   n , first emission control lines E 11  through E 1   n , and data lines D 1  through Dm. The first pixels PXL 1  receive data signals from the data lines D 1  through Dm when scan signals are supplied from the first scan lines S 11  through S 1   n . The first pixels PXL 1  that receive the data signals control the amount of current that flows from a first power source ELVDD to a second power source ELVSS via organic light emitting diodes (OLED). 
     The second pixels PXL 2  are in the second pixel region AA 2  divided by second scan lines S 21  through S 2   j , second emission control lines E 21  through E 2   j , and data lines Dm- 2  through Dm. The second pixels PXL 2  receive data signals from the data lines Dm- 2  through Dm when scan signals are supplied from the second scan lines S 21  through S 2   j . The second pixels PXL 2  that receive the data signals control the amount of current that flows from the first power source ELVDD to the second power source ELVSS via the OLEDs. 
     The first scan driver  210  supplies the scan signals to the first scan lines S 11  through S 1   n  based on a first gate control signal GCS 1  from the timing controller  250 . For example, the first scan driver  210  may sequentially supply the scan signals to the first scan lines S 11  through S 1   n . When the scan signals are sequentially supplied to the first scan lines S 11  through S 1   n , the first pixels PXL 1  are sequentially selected in units of horizontal lines. 
     The second scan driver  213  supplies the scan signals to the second scan lines S 21  through S 2   j  based on the first gate control signal GCS 1  from the timing controller  250 . For example, the second scan driver  213  may sequentially supply the scan signals to the second scan lines S 21  through S 2   j.    
     When the scan signals are sequentially supplied to the second scan lines S 21  through S 2   j , the second pixels PXL 2  are sequentially selected in units of horizontal lines. For example, in the display device  100 , the second pixels PXL 2  are sequentially selected in units of horizontal lines. Then, the first pixels PXL 1  are sequentially selected in units of horizontal lines. 
     Loads of the first scan lines S 11  through S 1   n  may be different from loads of the second scan lines S 21  through S 2   j . For example, since a width W 1  of the first pixel region AA 1  is larger than a width W 2  of the second pixel region AA 2 , the lengths of the first scan lines S 11  through S 1   n  may be greater than the lengths of the second scan lines S 21  through S 2   j . Thus, the number of second pixels PXL 2  connected to one of the second scan lines S 21  through S 2   j  may be less than the number of first pixels PXL 1  connected to one of the first scan lines S 11  through S 1   n . Therefore, the loads of the first scan lines S 11  through S 1   n  may be greater than the loads of the second scan lines S 21  through S 2   j.    
     As a result, a difference in time constant may be generated between the scan signals supplied to the first pixels PXL 1  and the scan signals supplied to the second pixels PXL 2 . For example, the scan signals supplied to the first scan lines S 11  through S 1   n  have larger delay than the scan signals supplied to the second scan lines S 21  through S 2   j . In this case, time for which the data signals are written in the first pixels PXL 1  selected by the scan signals supplied to the first scan lines S 11  through S 1   n  is less than time for which the data signals are written in the second pixels PXL 2  selected by the scan signals supplied to the second scan lines S 21  through S 2   j . As a result, a brightness difference between the first pixels PXL 1  and the second pixels PXL 2  may be generated due to the difference in time constant between the scan signals. 
     The display driver  200  according to the embodiment may further include the signal delay unit  240 . The signal delay unit  240  may delay the first gate control signal GCS 1  output from the timing controller  250  and may transmit the delayed first gate control signal GCS 1  to at least one of the scan drivers  210  and  213 . 
     For example, the signal delay unit  240  may delay the first gate control signal GCS 1  by a predetermined time constant while the second scan driver  213  operates. In on embodiment, the signal delay unit  240  may delay clock signals (signals for shifting a start pulse for controlling timing of a first scan signal). 
     In addition, the signal delay unit  240  may transmit the first gate control signal GCS 1  output from the timing controller  250  while the first scan driver  210  operates. Thus, the difference in time constant between the scan signals, caused by the difference in load between the first scan lines S 11  through S 1   n  and the second scan lines S 21  through S 2   j , may be reduced by the signal delay unit  240  controlling the first gate control signal GCS 1  for driving the first scan driver  210  and the second scan driver  213 . 
     The first emission control driver  220  supplies emission control signals to the first emission control lines E 11  through E 1   n  based on a second gate control signal GCS 2  from the timing controller  250 . For example, the first emission control driver  220  may sequentially supply the emission control signals to the first emission control lines E 11  through E 1   n . The emission control signals control emission time of the first pixels PXL 1 . The emission control signals may have greater widths than the scan signals. 
     The second emission control driver  223  supplies emission control signals to the second emission control lines E 21  through E 2   j . For example, the second emission control driver  223  may sequentially supply the emission control signals to the second emission control lines E 21  through E 2   j . The emission control signals control emission time of the second pixels PXL 2 . The emission control signals may have greater widths than the scan signals. 
     On the other hand, the emission control signals may have gate-off voltages (for example, high voltages) to turn off transistors in the pixels PXL 1  and PXL 2  and the scan signals may have gate-on voltages (for example, low voltages) to turn on the transistors in the pixels PXL 1  and PXL 2 . 
     The data driver  230  supplies data signals to the data lines D 1  through Dm based on a data control signal DCS. The data signals supplied to the data lines D 1  through Dm are supplied to pixels PXL 1  and PXL 2  selected by the scan signals. 
     The timing controller  250  supplies the gate control signals GCS 1  and GCS 2  generated based on timing signals supplied from an external source to the scan drivers  210  and  213  and the emission control drivers  220  and  223  through a first signal line SL 1  and a second signal line SL 2 . The timing controller  250  supplies the data control signal DCS to the data driver  230  through a third signal line SL 3 . In addition, the timing controller  250  supplies a control signal LCS to a signal delay unit  340  through an operation control signal line SL 10 . 
     A start pulse and clock signals are in each of the gate control signals GCS 1  and CGS 2 . The start pulse controls timing of a first scan signal or a first emission control signal. The clock signals are used to shift the start pulse. 
     A source start pulse and clock signals are in the data control signal DCS. The source start pulse controls a sampling start point of time of data. The clock signals are used to control a sampling operation. 
       FIG. 5  illustrates an embodiment of the first pixel of  FIG. 4 . e.g., a pixel connected to the mth data line Dm and the ith first scan line S 1   i  is illustrated. 
     Referring to  FIG. 5 , the first pixel PXL 1  includes an OLED, first through seventh transistors T 1  through T 7 , and a storage capacitor Cst. The OLED has an anode connected to the first transistor T 1  via the sixth transistor T 6  and a cathode electrode connected to the second power source ELVSS. The OLED emits light with a predetermined brightness corresponding to an amount of current supplied from the first transistor T 1 . The first power source ELVDD may have a higher voltage than the second power source ELVSS so that a current may flow to the OLED. 
     The seventh transistor T 7  is connected between an initializing power source Vint and the anode electrode of the OLED. A gate electrode of the seventh transistor T 7  is connected to the ith first scan line S 1   i . The seventh transistor T 7  is turned on when a scan signal is supplied to the ith first scan line S 1   i  and supplies a voltage of the initializing power source Vint to the anode electrode of the OLED. The initializing power source Vint may be set to have a lower voltage than a data signal. 
     The sixth transistor T 6  is connected between the first transistor T 1  and the OLED. A gate electrode of the sixth transistor T 6  is connected to the ith first emission control line E 1   i . The sixth transistor T 6  is turned off when an emission control signal is supplied to the ith first emission control line E 1   i  and is turned on in the other case. 
     The fifth transistor T 5  is connected between the first power source ELVDD and the first transistor T 1 . A gate electrode of the fifth transistor T 5  is connected to the ith first emission control line E 1   i . The fifth transistor T 5  is turned off when the emission control signal is supplied to the ith first emission control line E 1   i  and is turned on in the other case. 
     The first transistor T 1  (driving transistor) has a first electrode connected to the first power source ELVDD via the fifth transistor T 5  and a second electrode connected to the anode electrode of the OLED via the sixth transistor T 6 . A gate electrode of the first transistor T 1  is connected to a first node N 1 . The first transistor T 1  controls an amount of current that flows from the first power source ELVDD to the second power source ELVSS via the OLED to correspond to a voltage of the first node N 1 . 
     The third transistor T 3  is connected between the second electrode of the first transistor T 1  and the first node N 1 . A gate electrode of the third transistor T 3  is connected to the ith first scan line S 1   i . The third transistor T 3  is turned on when the scan signal is supplied to the ith first scan line S 1   i  and electrically connects the second electrode of the first transistor T 1  and the first node N 1 . Therefore, when the third transistor T 3  is turned on, the first transistor T 1  is diode-connected. 
     The fourth transistor T 4  is connected between the first node N 1  and the initializing power source Vint. A gate electrode of the fourth transistor T 4  is connected to an (i- 1 )th first scan line S 1 i- 1 . The fourth transistor T 4  is turned on when the scan signal is supplied to the (i- 1 )th first scan line S 1 i- 1  and supplies a voltage of the initializing power source Vint to the first node N 1 . 
     The second transistor T 2  is connected between the mth data line Dm and the first electrode of the first transistor T 1 . A gate electrode of the second transistor T 2  is connected to the ith first scan line S 1   i . The second transistor T 2  is turned on when the scan signal is supplied to the ith first scan line S 1   i  and electrically connects the mth data line Dm and the first electrode of the first transistor T 1 . 
     The storage capacitor Cst is connected between the first power source ELVDD and the first node N 1 . The storage capacitor Cst stores the data signal and a voltage corresponding to a threshold voltage of the first transistor T 1 . On the other hand, the second pixel PXL 2  and a third pixel PXL 3  may be implemented by the same circuit as the first pixel PXL 1 . 
       FIG. 6  illustrates an embodiment of scan stages and a signal delay unit that are connected to a first signal line. Referring to  FIG. 6 , the first scan driver  210 , the second scan driver  213 , and the signal delay unit  240  may be connected to the first signal line SL 1 . The first signal line SL 1  may supply the first gate control signal GCS 1  to the first scan driver  210  and the second scan driver  213 . 
     The first scan driver  210  may be connected to one end of each of the first scan lines S 11  through S 1   n  and may supply first scan signals to the first scan lines S 11  through S 1   n . The first scan driver  210  may include a plurality of scan stages SST 11  through SST 1   n . Each of the scan stages SST 11  through SST 1   n  of the first scan driver  210  is connected to the one end of each of the first scan lines S 11  through S 1   n  and the scan stages SST 11  through SST 1   n  may respectively supply the first scan signals to the first scan lines S 11  through S 1   n . At this time, the scan stages SST 11  through SST 1   n  may operate based on the first gate control signal GCS 1  supplied through the first signal line SL 1 . In addition, the scan stages SST 11  through SST 1   n  may be implemented by the same circuit. 
     The second scan driver  213  may be connected to one end of each of the second scan lines S 21  through S 2   j  and may supply second scan signals to the second scan lines S 21  through S 2   j . The second scan driver  213  may include a plurality of scan stages SST 21  through SST 2   j . Each of the scan stages SST 21  through SST 2   j  of the second scan driver  213  is connected to one end of each of the first scan lines S 21  through S 2   j  and the scan stages SST 21  through SST 2   j  may supply the second scan signals to the second scan lines S 21  through S 2   j . At this time, the scan stages SST 21  through SST 2   j  may operate based on the first gate control signal GCS 1  supplied through the first signal line SL 1 . 
     The scan stages SST 21  through SST 2   j  may be implemented by the same circuit. 
     In addition, the scan stages SST 11  through SST 1   n  of the first scan driver  210  and the scan stages SST 21  through SST 2   j  of the second scan driver  213  may be implemented by the same circuit. 
     The signal delay unit  240  may include signal delay elements (a first signal delay control capacitor CL 1  and a first signal delay control resistor RL 1 ) and a first signal delay control transistor TL 1 . The first signal delay control capacitor CL 1  has a first electrode connected to a ground and a second electrode connected to the first signal delay control resistor RL 1 . The first signal delay control resistor RL 1  has a first electrode connected to the second electrode of the first signal delay control capacitor CL 1  and a second electrode connected to the first signal delay control transistor TL 1 . 
     The first signal delay control transistor TL 1  has a first electrode connected to the second electrode of the first signal delay control resistor RL 1  and a second electrode of the first signal delay control transistor TL 1  may be connected to the first signal line SL 1 . A gate electrode of the first signal delay control transistor TL 1  may be connected to the operation control signal line SL 10  of the signal delay unit  240 . The first signal delay control transistor TL 1  may be turned on when the control signal LCS is supplied to the operation control signal line SL 10  of the signal delay unit  240 . In this case, the first gate control signal GCS 1  may be delayed by a predetermined time constant T. 
     The time constant τ may be set based on a resistance value of the first signal delay control resistor RL 1  and a capacitance value of the first signal delay control capacitor CL 1 . 
     The first signal delay control transistor TL 1  is turned on while the scan stages SST 21  through SST 2   j  of the second scan driver  213  operate (that is, in a period in which the second scan signals are output) and may be turned off while the scan stages SST 11  through SST 1   n  of the first scan driver  210  operate (that is, in a period in which the first scan signals are output). Thus, the scan stages SST 21  through SST 2   j  of the second scan driver  213  may operate based on the first gate control signal GCS 1  delayed by the time constant τ. Therefore, the second scan signals output from the second scan lines S 21  through S 2   j  may be delayed based on the first gate control signal GCS 1  delayed by the time constant τ. 
     On the other hand, the capacitance value of the first signal delay control capacitor CL 1  and the resistance value of the first signal delay control resistor RL 1  may be set with reference to a difference in load between the first scan lines S 11  through S 1   n  and the second scan lines S 21  through S 2   j . On the other hand,  FIG. 6  illustrates that the first signal delay control capacitor CL 1  the first signal delay control resistor RL 1 , and the first signal delay control transistor TL 1  are sequentially connected. That is, the order in which the first signal delay control capacitor CL 1 , the first signal delay control resistor RL 1 . and the first signal delay control transistor TL 1  are connected may vary. 
     In addition,  FIG. 6  illustrates that both the first signal delay control capacitor CL 1  and the first signal delay control resistor RL 1  are provided as the signal delay elements. In another embodiment, only one of the first signal delay control capacitor CL 1  and the first signal delay control resistor RL 1  may be provided as the signal delay element. 
       FIG. 7  illustrates an embodiment of a scan driver. A start pulse SSP 1  and clock signals CLK 1  and CLK 2  may be in the first gate control signal GCS 1  operated by the scan drivers  210  and  213 . As illustrated in  FIG. 7 , when the first gate control signal GCS 1  includes the plurality of clock signals CLK 1  and CLK 2 , clock signal lines SL 1   a  and SL 1   b  that transmit the clock signals CLK 1  and CLK 2  may be connected to the signal delay unit  240 . 
     Referring to  FIG. 7 , the second scan driver  213  may include the plurality of scan stages SST 21  through SST 2   j  and the first scan stage SST 11  of the first scan driver  210  is provided after the last scan stage SST 2   j  of the second scan driver  213 . Each of the scan stages SST 21  through SST 2   j  and SST 11  through SST 1   n  is connected to one of the scan lines S 21  through S 2   j  and S 11  through S 1 n and the scan stages SST 21  through SST 2   j  and SST 11  through SST 1   n  are driven based on the clock signals CLK 1  and CLK 2 . The scan stages SST 21  through SST 2   j  and SST 11  through SST 1   n  may be implemented by the same circuit. 
     Each of the scan stages SST 21  through SST 2   j  and SST 11  through SST 1   n  includes first through third input terminals  1001  through  1003  and an output terminal  1004 . The first input terminal  1001  of each of the scan stages SST 21  through SST 2   j  and SST 11  through SST 1   n  receives an output signal (that is, a scan signal) of a scan stage of a previous end or the start pulse SSP 1 . For example, the first input terminal  1001  of the first scan stage SST 21  of the second scan driver  213  receives the start pulse SSP 1  and the first input terminal  1001  of each of the remaining scan stages SST 22  through SST 2   j  and SST 11  through SST 1   n  receives an output signal of a scan stage of a previous end. 
     A second input terminal  1002  of an lth (l is an odd number or an even number) scan stage receives the first clock signal CLK 1  and the third input terminal  1003  of the lth scan stage receives the second clock signal CLK 2 . A second input terminal  1002  of an (l+l)th scan stage receives the second clock signal CLK 2  and the third input terminal  1003  of the (l+l)th scan stage receives the first clock signal CLK 1 . 
     The first clock signal CLK 1  and the second clock signal CLK 2  have the same period and phases of the first clock signal CLK 1  and the second clock signal CLK 2  do not overlap. For example, when a period in which a scan signal is supplied to one scan line is referred to as a 1 horizontal period  1 H, the clock signals CLK 1  and CLK 2  have periods of  2 H and are supplied in different horizontal periods. 
     In addition, each of the scan stages SST 21  through SST 2   j  and SST 11  through SST 1   n  receives a first power source VDD and a second power source VSS. The first power source VDD may have a gate-off voltage, for example, a high voltage. The second power source VSS may have a gate-on voltage, for example, a low voltage. 
     In a first period in which the scan signals are supplied to the second scan lines S 21  through S 2   j , the first signal delay control transistor TL 1  of the signal delay unit  240  may be turned on so that the clock signals CLK 1  and CLK 2  delayed by the time constant τ may be applied to the scan stages SST 21  through SST 2   j  of the second scan driver  213 . 
     In a second period in which the scan signals are supplied to the first scan lines S 11  through S 1   n , the first signal delay control transistor TL 1  of the signal delay unit  240  may be turned off so that the clock signals CLK 1  and CLK 2  output by the timing controller  250  may be applied to the scan stages SST 11  through SST 1   n  of the first scan driver  210 . 
       FIG. 8  illustrates an embodiment of a waveform diagram for a first gate control signal input to the scan stage of  FIG. 7  and scan signals output from the scan stage of  FIG. 7 . Referring to  FIG. 8 , the first clock signal CLK 1  and the second clock signal CLK 2  have periods of a 2 horizontal period ( 2 H) and are supplied in different horizontal periods. The second clock signal CLK 2  may be shifted from the first clock signal CLK 1  by a half period (that is, the 1 horizontal period). 
     The start pulse SSP 1  supplied to the first input terminal  1001  is supplied in synchronization with the clock signal supplied to the second input terminal  1002 , that is, the first clock signal CLK 1 . 
     As illustrated in  FIG. 8 , a horizontal period in which the scan signals are supplied to the second scan lines S 21  through S 2   j  may be a first period T 1  and a horizontal period in which the scan signals are output to the first scan lines S 11  through S 1   n  may be a second period T 2 . 
     In the first period T 1 , the first signal delay control transistor TL 1  of the signal delay unit  240  may be turned on so that the clock signals CLK 1  and CLK 2  delayed by the time constant τ may be applied to the scan stages SST 21  through SST 2   j . For example, in the first period T 1 , falling edges and rising edges of the clock signals CLK 1  and CLK 2  may be inclined. 
     In waveforms illustrating the clock signals of  FIG. 8 , dotted lines illustrate clock signals generated by the timing controller  250  and solid lines illustrate clock signals input to the scan stages SST 11  through SST 1   n  and SST 21  through SST 2   j . Thus, in  FIG. 8 , the clock signals CLK 1  and CLK 2  are delayed in the first period T 1 . 
     Shapes of the second scan signals output from the second scan lines S 21  through S 2   j  may correspond to the clock signals CLK 1  and CLK 2 . Therefore, in the first period T 1 , falling edges and rising edges of the second scan signals output from the second scan lines may be inclined. In waveforms illustrating the second scan signals of  FIG. 8 , dotted lines illustrate scan signals generated by the clock signals that are not delayed and solid lines illustrate scan signals generated by the delayed clock signals. 
     In the second period T 2 , the first signal delay control transistor TL 1  may be turned off, so that the clock signals CLK 1  and CLK 2  output by the timing controller  250  may be applied to the scan stages SST 11  through SST 1   n  of the first scan driver  210 . Thus, in the second period, T 2 , the falling edges and the rising edges of the clock signals CLK 1  and CLK 2  may be parallel. 
     Since the length of the first scan lines S 11  through S 1   n  is greater than the length of the second scan lines S 21  through S 2   j , the loads of the first scan lines S 11  through S 1   n  may be greater than the loads of the second scan lines S 21  through S 2   j . For example, although the clock signals CLK 1  and CLK 2  output by the timing controller  250  are applied to the scan stages SST 11  through SST 1   n  as they are, as illustrated in  FIG. 8 , the first scan signals are delayed. 
     According to the present invention, the second scan signals are also delayed by the signal delay unit  240  as much the first scan signals are delayed by the loads of the first scan lines S 11  through S 1   n . Thus, the brightness difference between the first pixel region AA 1  and the second pixel region AA 2  may be reduced. 
       FIG. 9  is a circuit diagram illustrating an embodiment of the scan stage of FIG. 
       7 . In  FIG. 9 , for convenience sake, the first scan stage SST 21  and the second scan stage SST 22  of the second scan driver are illustrated. 
     Referring to  FIG. 9 , the first scan stage SST 21  includes a first driver  1210 , a second driver  1220 , an output unit (or a buffer)  1230 , and a first transistor M 1 . The output unit  1230  controls a voltage supplied to an output terminal  1004  to correspond to voltages of the first node N 1  and a second node N 2 . For this purpose, the output unit  1230  includes a fifth transistor M 5  and a sixth transistor M 6 . 
     The fifth transistor M 5  is between the first power source VDD and the output terminal  1004  and a gate electrode thereof is connected to the first node N 1 . The fifth transistor M 5  controls connection between the first power source VDD and the output terminal  1004  based on the voltage applied to the first node N 1 . 
     The sixth transistor M 6  is between the output terminal  1004  and the third input terminal  1003  and a gate electrode thereof is connected to the second node N 2 . The sixth transistor M 6  controls connection between the output terminal  1004  and the third input terminal  1003  based on the voltage applied to the second node N 2 . 
     The output unit  1230  is driven as the buffer. In addition, the fifth transistor and/or the sixth transistor M 6  may be configured by connecting a plurality of transistors in parallel. 
     The first driver  1210  controls a voltage of a third node N 3  based on signals supplied to the first through third input terminals  1001  through  1003 . For this purpose, the first driver  1210  includes second through fourth transistors M 2  through M 4 . 
     The second transistor M 2  is between the first input terminal  1001  and the third node n 3  and a gate electrode thereof is connected to the second input terminal  1002 . The second transistor M 2  controls connection between the first input terminal  1001  and the third node N 3  based on a signal supplied to the second input terminal  1002 . 
     The third transistor M 3  and the fourth transistor M 4  are serially connected between the third node N 3  and the first power source VDD. Actually, the third transistor M 3  is between the fourth transistor m 4  and the third node N 3  and a gate electrode thereof is connected to the third input terminal  1003 . The third transistor M 3  controls connection between the fourth transistor M 4  and the third node N 3  based on a signal supplied to the third input terminal  1003 . 
     The fourth transistor M 4  is positioned between the third transistor M 3  and the first power source VDD and a gate electrode thereof is connected to the first node N 1 . The fourth transistor M 4  controls connection between the third transistor M 3  and the first power source VDD based on the voltage of the first node N 1 . 
     The second driver  1220  controls the voltage of the first node N 1  to correspond to a voltage of the second input terminal  1002  and a voltage of the third node N 3 . For this purpose, the second driver  1220  includes a seventh transistor M 7 , an eighth transistor M 8 , a first capacitor C 1 , and a second capacitor C 2 . 
     The first capacitor C 1  is connected between the second node N 2  and the output terminal  1004 . The first capacitor C 1  charges a voltage corresponding to turn-on or turn-off of the sixth transistor M 6 . The second capacitor C 2  is connected between the first node N 1  and the first power source VDD. The second capacitor C 2  charges the voltage applied to the first node N 1 . 
     The seventh transistor M 7  is between the first node N 1  and the second input terminal  1002  and a gate electrode thereof is connected to the third node N 3 . The seventh transistor M 7  controls connection between the first node N 1  and the second input terminal  1002  based on the voltage of the third node N 3 . 
     The eighth transistor M 8  is between the first node N 1  and the second power source Vss and a gate electrode thereof is connected to the second input terminal  1002 . The eighth transistor M 8  controls connection between the first node N 1  and the second power source VSS based on the signal of the second input terminal  1002 . 
     The first transistor M 1  is between the third node N 3  and the second node N 2  and a gate electrode thereof is connected to the second power source VSS. The first transistor M 1  maintains electrical connection of the third node N 3  and the second node N 2  while maintaining a turn-on state. 
     In addition, the first transistor M 1  limits a voltage drop width of the third node N 3  to correspond to the voltage of the second node N 2 . For example, although the voltage of the second node N 2  is reduced to a voltage lower than a voltage of the second power source VSS, the voltage of the third node N 3  does not become lower than a voltage obtained by subtracting the threshold voltage of the first transistor M 1  from the voltage of the second power source VSS, which will be described in detail later. 
       FIG. 10  illustrates an embodiment of a method for driving the scan stage of  FIG. 9 . In  FIG. 10 . for convenience sake, operation processes will be described by using the first scan stage SST 21 . In addition, since  FIG. 10  is for describing the method of driving the scan stage, it is estimated that the above-described delay phenomenon is excluded from the clock signals input to the scan stage and the scan signal output from the scan stage. 
     Referring to  FIG. 10 , the first clock signal CLK 1  and the second clock signal CLK 2  have periods of a 2 horizontal period (2H) and are supplied in different horizontal periods. For example, the second clock signal CLK 2  is shifted from the first clock signal CLK 1  by a half period (that is, the 1 horizontal period). 
     The start pulse SSP 1  supplied to the first input terminal  1001  is supplied in synchronization with the clock signal supplied to the second input terminal  1002 , that is, the first clock signal CLK 1 . When the start pulse SSP 1  is supplied, the first input terminal  1001  is set as the voltage of the second power source VSS. When the start pulse SSP 1  is not supplied, the first input terminal  1001  may be set as a voltage of the first power source VDD. 
     When the clock signals CLK 1  and CLK 2  are supplied to the second input terminal  1002  and the third input terminal  1003 , the second input terminal  1002  and the third input terminal  1003  are set to have the voltage of the second power source VSS. When the clock signals CLK 1  and CLK 2  are not supplied to the second input terminal  1002  and the third input terminal  1003 , the second input terminal  1002  and the third input terminal  1003  are set to have the voltage of the first power source VDD. 
     Operation processes will be described in detail as follows. First, the start pulse SSP 1  is supplied in synchronization with the first clock signal CLK 1 . When the first clock signal CLK 1  is supplied, the second transistor M 2  and the eighth transistor M 8  are turned on. When the second transistor M 2  is turned on, the first input terminal  1001  and the third node N 3  are electrically connected. Since the first transistor M 1  is always set to be in a turn-on state, the second node N 2  maintains electrical connection to the third node N 3 . 
     When the first input terminal  1001  and the third node N 3  are electrically connected, the third node N 3  and the second node N 2  are set to have low voltages by the start pulse SSP 1  supplied to the first input terminal  1001 . When the third node N 3  and the second node N 2  are set to have the low voltages, the sixth transistor M 6  and the seventh transistor M 7  are turned on. 
     When the sixth transistor M 6  is turned on, the third input terminal  1003  and the output terminal  1004  are electrically connected. The third terminal  1003  is set to have a high voltage (that is, the second clock signal CLK 2  is not supplied) so that a high voltage is output to the output terminal  1004 . When the seventh transistor M 7  is turned on, the second input terminal  1002  and the first node N 1  are electrically connected. Then, a voltage of the first clock signal CLK 1  supplied to the second input terminal  1002 , that is, a low voltage is supplied to the first node N 1 . 
     In addition, when the first clock signal CLK 1  is supplied, the eighth transistor 
     M 8  is turned on. When the eighth transistor M 8  is turned on, the voltage of the second power source VSS is supplied to the first node N 1 . The voltage of the second power source VSS is set to be the same as (similar to) the first clock signal CLK 1  so that the first node N 1  stably maintains the low voltage. 
     When the first node N 1  is set to have the low voltage, the fourth transistor M 4  and the fifth transistor M 5  are turned on. When the fourth transistor M 4  is turned on, the first power source VDD and the third transistor m 3  are electrically connected. Since the third transistor M 3  is set to be in a turn-off state, although the fourth transistor M 4  is turned on, the third node N 3  stably maintains a low voltage. When the fifth transistor M 5  is turned on, the voltage of the first power source VDD is supplied to the output terminal  1004 . The voltage of the first power source VDD is set as the same voltage as the high voltage supplied to the third input terminal  1003 , so that the output terminal  1004  stably maintains the high voltage. 
     Then, supplies of the start signal SSP 1  and the first clock signal CLK 1  are stopped. When the supply of the first clock signal CLK 1  is stopped, the second transistor M 2  and the eighth transistor M 8  are turned off. At this time, the sixth transistor M 6  and the seventh transistor M 7  maintain turn-on states based on the voltage stored in the first capacitor C 1 . Thus, the second node N 2  and the third node N 3  maintain the low voltages due to the voltage stored in the first capacitor C 1 . 
     When the sixth transistor M 6  maintains the turn-on state, the output terminal  1004  and the third input terminal  1003  maintain electrical connection. When the seventh transistor M 7  maintains the turn-on state, the first node Ni maintains electrical connection to the second input terminal  1002 . The second input terminal  1002  is set to have a high voltage as supply of the first clock signal CLK 1  is stopped so that the first node N 1  is set to have a high voltage. When the high voltage is supplied to the first node N 1 . the fourth transistor M 4  and the fifth transistor M 5  are turned off. 
     Then, the second clock signal CLK 2  is supplied to the third input terminal  1003 . 
     At this time, since the sixth transistor M 6  is set to be in the turn-on state, the second clock signal CLK 2  supplied to the third input terminal  1003  is supplied to the output terminal  1004 . In this case, the output terminal  1004  outputs the second clock signal CLK 2  to the second scan lines S 21  through S 2   j  as a scan signal. 
     When the second clock signal CLK 2  is supplied to the output terminal  1004 , the voltage of the second node N 2  is reduced to the voltage lower than the voltage of the second power source VSS, by coupling of the first capacitor C 1  so that the sixth transistor M 6  stably maintains the turn-on state. On the other hand, although the voltage of the second node N 2  is reduced, the third node N 3  maintains the voltage of the second power source VSS (the voltage obtained by subtracting the threshold voltage of the first transistor M 1  from the voltage of the second power source VSS). 
     After a scan signal is output to the first scan line S 11 , the supply of the second clock signal CLK 2  is stopped. When the supply of the second clock signal CLK 2  is stopped, the output terminal  1004  outputs a high voltage. The voltage of the second node N 2  is increased to the voltage of the second power source VSS to correspond to the high voltage of the output terminal  1004 . 
     Then, the first clock signal CLK 1  is supplied. When the first clock signal CLK 1  is supplied, the second transistor M 2  and the eighth transistor M 8  are turned on. When the second transistor M 2  is turned on, the first input terminal  1001  and the third node N 3  are electrically connected. At this time, the start pulse SSPI is not supplied to the first input terminal  1001 , so that the first input terminal  1001  is set to have a high voltage. Therefore, when the first transistor M 1  is turned on, the high voltage is supplied to the third node N 3  and the second node N 2 , so that the sixth transistor M 6  and the seventh transistor M 7  are turned off. 
     When the eighth transistor M 8  is turned on, the second power source VSS is supplied to the first node N 1  so that the fourth transistor M 4  and the fifth transistor M 5  are turned on. When the fifth transistor M 5  is turned on, the voltage of the first power source VDD is supplied to the output terminal  1004 . Then, the fourth transistor M 4  and the fifth transistor M 5  maintain turn-on states based on the voltage charged in the second capacitor C 2 , so that the output terminal  1004  stably receives the voltage of the first power source VDD. 
     In addition, when the second clock signal CLK 2  is supplied, the third transistor M 3  is turned on. At this time, since the fourth transistor M 4  is set to be in the turn-on state, the voltage of the first power source VDD is supplied to the third node N 3  and the second node N 2 . In this case, the sixth transistor M 6  and the seventh transistor M 7  stably maintain turn-off states. 
     The second scan stage SST 22  receives an output signal (that is, a scan signal) of the first scan stage SST 21  in synchronization with the second clock signal CLK 2 . In this case, the second scan stage SST 22  outputs a scan signal to the second scan line S 22  in synchronization with the first clock signal CLK 1 . The scan stages according to the present embodiment sequentially output the scan signals to the scan lines while repeating the above-described processes. 
     According to the present embodiment, the first transistor M 1  limits a voltage minimum width of the third node N 3  regardless of the voltage of the second node N 2 , so that manufacturing expenses may be reduced and driving reliability may be secured. For example, when a scan signal is supplied to the output terminal  1004 , the voltage of the second node N 2  is reduced to a voltage of about VSS-(VDD-VSS). When it is assumed that the voltage of the first power source VDD is 7V and the voltage of the second power source VSS is −8V, the voltage of the second node N 2  is reduced to about −20V in consideration of threshold voltages of the transistors. 
     When the first transistor M 1  is removed, Vds of the second transistor m 2  and Vgs of the seventh transistor M 7  are set as about −27V. Therefore, highly pressure-resistant parts must be used as the second transistor M 2  and the seventh transistor M 7 . In addition, when a high voltage is applied to the second transistor M 2  and the seventh transistor M 7 , a large amount of power is consumed and the driving reliability deteriorates. However, according to the present embodiment, when the first transistor M 1  is added between the third node N 3  and the second node N 2 , the voltage of the third node N 3  maintains the voltage of the second power source VSS so that Vds of the second transistor M 2  and Vgs of the seventh transistor M 7  are set as about −14V. 
       FIG. 11  illustrates another embodiment of a substrate  112  which may include pixel regions and peripheral regions. The pixel regions AA 1 , AA 2 , and AA 3  may include a first pixel region AA 1 , a second pixel region AA 2 , and a third pixel region AA 3 . The second pixel region AA 2  may be at one side of the first pixel region AA 1 . For example, the second pixel region AA 2  may be a protrusion that extends from a part of an upper side of the first pixel region AA 1 . The third pixel region AA 3  may be at one side of the second pixel region AA 2 . For example, the third pixel region AA 3  may be a protrusion that extends from a part of an upper side of the second pixel region AA 2 . 
     The first pixel region AA 1  may have a greater area than the second pixel region AA 2  and the third pixel region AA 3 . For example, the width W 1  of the first pixel region AA 1  may be greater than the width W 2  of the second pixel region AA 2  and the width W 3  of the third pixel region AA 3 . The length L 1  of the first pixel region AA 1  may be greater than the length L 2  of second pixel region AA 2  and the length L 3  of third pixel region AA 3 . 
     The second pixel region AA 2  may have a greater area than the third pixel region AA 3 . The width W 2  of the second pixel region AA 2  may be greater than the width W 3  of the third pixel region AA 3 . In addition, the length L 2  of the second pixel region AA 2  may be the same as or greater than the length L 3  of the third pixel region AA 3 . 
     The peripheral regions NA 1 , NA 2 , and NA 3  may include a first peripheral region NA 1 , a second peripheral region NA 2 , and a third peripheral region NA 3 . The first peripheral region NA 1  exists around the first pixel region AA 1  and may surround at least a part of the first pixel region AA 1 . The second peripheral region NA 2  exists around the second pixel region AA 2  and may surround the part of the first pixel region AA 1  and at least a part of the second pixel region AA 2 . The third peripheral region NA 3  exists around the third pixel region AA 3  and may surround the part of the second pixel region AA 2  and a part of the third pixel region AA 3 . 
     The pixels PXL 1 , PXL 2 , and PXL 3  may include first pixels PXL 1 , second pixels PXL 2 , and third pixels PXL 3 . For example, the first pixels PXL 1  may be in the first pixel region AA 1 , the second pixels PXL 2  may be in the second pixel region AA 2 , and the third pixels PXL 3  may be in the third pixel region AA 3 . 
     In the first pixel region AA 1 , the same number of first pixels PXL 1  may be in each horizontal line. In addition, in the second pixel region AA 2 , the same number of second pixels PXL 2  may be in each horizontal line. In the third pixel region AA 3 , the same number of third pixels PXL 3  may be in each horizontal line. 
     As described above, since the width W 1  of the first pixel region AA 1  is greater than the width W 2  of the second pixel region AA 2  and the width W 2  of the second pixel region AA 2  is greater than the width W 3  of the third pixel region AA 3 , the number of first pixels PXL 1  in the horizontal lines of the first pixel region AA 1  may be greater than the number of second pixels PXL 2  in the horizontal lines of second pixel region AA 2 . In addition, the number of second pixels PXL 2  in the horizontal lines of the second pixel region AA 2  may be greater than the number of third pixels PXL 3  in the horizontal lines of the third pixel region AA 3 . The substrate  112  may have various shapes so that the above-described pixel regions AA 1 , AA 2 , and AA 3  and peripheral regions NA 1 , NA 2 , and NA 3  may be set. 
       FIG. 12  illustrates another embodiment of a display device which may include the first pixels PXL 1 , the second pixels PXL 2 , the third pixels PXL 3 , a first scan driver  310 , a first emission control driver  320 , a second scan driver  313 , a second emission control driver  323 , a third scan driver  315 , a third emission control driver  325 , a data driver  330 , a signal delay unit  340 , and a timing controller  350 . 
     The first pixels PXL 1  are in the first pixel region AA 1  divided by the first scan lines S 11  through S 1   n , the first emission control lines E 11  through E 1   n , and the data lines D 1  through Dm. The first pixels PXL 1  receive the data signals from the data lines D 1  through Dm when the scan signals are supplied from the first scan lines S 11  through S 1   n . The first pixels PXL 1  that receive the data signals control the amount of current that flows from the first power source ELVDD to the second power source ELVSS via the OLEDs. 
     The second pixels PXL 2  are in the second pixel region AA 2  divided by the second scan lines S 21  through S 2   j , the second emission control lines E 21  through E 2   j , and the data lines Dm- 2  through Dm. The second pixels PXL 2  receive the data signals from the data lines Dm- 2  through Dm when the scan signals are supplied from the second scan lines S 21  through S 2   j . The second pixels PXL 2  that receive the data signals control the amount of current that flows from the first power source ELVDD to the second power source ELVSS via the OLEDs. 
     The third pixels PXL 3  are in the third pixel region AA 3  divided by third scan lines S 31  through S 3   k , second emission control lines E 31  through E 3   k , and data lines Dm- 1  through Dm. The third pixels PXL 3  receive the data signals from the data lines Din- 1  through Dm when scan signals are supplied from the third scan lines S 31  through S 3   k . The third pixels PXL 3  that receive the data signals control the amount of current that flows from the first power source ELVDD to the second power source ELVSS via OLEDs. 
     The first scan driver  310  supplies the scan signals to the first scan lines S 11  through S 1   n  based on the first gate control signal GCS 1  from the timing controller  350 . For example, the first scan driver  310  may sequentially supply the scan signals to the first scan lines S 11  through S 1   n . When the scan signals are sequentially supplied to the first scan lines S 11  through S 1   n , the first pixels PXL 1  are sequentially selected in units of horizontal lines. 
     The second scan driver  313  supplies the scan signals to the second scan lines S 21  through S 2   j  based on the first gate control signal GCS 1  from the timing controller  350 . For example, the second scan driver  313  may sequentially supply the scan signals to the second scan lines S 21  through S 2   j . When the scan signals are sequentially supplied to the second scan lines S 21  through S 2   j , the second pixels PXL 2  are sequentially selected in units of horizontal lines. 
     The third scan driver  315  supplies the scan signals to the third scan lines S 31  through S 3   k  based on the first gate control signal GCS 1  from the timing controller  350 . For example, the third scan driver  315  may sequentially supply the scan signals to the third scan lines S 31  through S 3   k . When the scan signals are sequentially supplied to the third scan lines S 31  through S 3   k , the third pixels PXL 3  are sequentially selected in units of horizontal lines. 
     On the other hand, the loads of the first scan lines S 11  through S 1   n , the loads of the second scan lines S 21  through S 2   j , and loads of the third scan lines S 31  through S 3   k  may be different from one another. 
     Since the width W 1  of the first pixel region AA 1  is greater than the width W 2  of the second pixel region AA 2 , the length of the first scan lines S 11  through S 1   n  may be greater than the length of the second scan lines S 21  through S 2   j . Thus, the number of second pixels PXL 2  connected to one of the second scan lines S 21  through S 2   j  may be less than the number of first pixels PXL 1  connected to one of the first scan lines S 11  through S 1   n . Therefore, the loads of the first scan lines S 11  through S 1   n  may be greater than the loads of the second scan lines S 21  through S 2   j.    
     Since the width W 2  of the second pixel region AA 2  is greater than a width W 3  of the third pixel region AA 3 , the length of the second scan lines S 21  through S 2   j  may be greater than a length of the third scan lines S 31  through S 3   k . Thus, the number of third pixels PXL 3  connected to one of the third scan lines S 31  through S 3   k  may be less than the number of second pixels PXL 2  connected to one of the second scan lines S 21  through S 2   j . Therefore, the loads of the second scan lines S 21  through S 2   j  may be greater than the loads of the third scan lines S 31  through S 3   k.    
     As a result, differences in time constant may be generated among the scan signals supplied to the pixels PXL 1 , PXL 2 , and PXL 3 . For example, the scan signals supplied to the first scan lines S 11  through S 1   n  have greater delay than the scan signals supplied to the second scan lines S 21  through S 2   j . In addition, the scan signals supplied to the second scan lines S 21  through S 2   j  have greater delay than the scan signals supplied to the third scan lines S 31  through S 3   k . Brightness differences may be generated among the first pixels PXL 1  through the third pixels PXL 3  due to the differences in time constant among the scan signals. 
     The signal delay unit  340  according to the present embodiment may delay the first gate control signal GCS 1  output from the timing controller  350  by a predetermined time constant and may transmit the delayed first gate control signal GCS 1  to at least one of the scan drivers  310 ,  313 , and  315 . For example, the signal delay unit  340  may delay the first gate control signal GCS 1  while the second scan driver  313  or the third scan driver  315  operates. In this case, the first gate control signal GCS 1  may be delayed more in a period in which the third scan driver  315  operates than in a period in which the second scan driver  313  operates. In addition, the signal delay unit  340  may transmit the first gate control signal GCS 1  output from the timing controller  350  as is while the first scan driver  310  operates. Thus, the first gate control signal GCS 1  may not be delayed. 
     The first emission control driver  320  supplies the emission control signals to the first emission control lines E 11  through E 1   n  based on the second gate control signal GCS 2  from the timing controller  350 . For example, the first emission control driver  320  may sequentially supply the emission control signals to the first emission control lines E 11  through E 1   n . The emission control signals are used to control the emission time of the first pixels PXL 1 . For this purpose, the emission control signals may have greater widths than the scan signals. 
     The second emission control driver  323  supplies the emission control signals to the second emission control lines E 21  through E 2   j . For example, the second emission control driver  323  may sequentially supply the emission control signals to the second emission control lines E 21  through E 2   j . The emission control signals are used to control the emission time of the second pixels PXL 2 . For this purpose, the emission control signals may be set to have larger widths than the scan signals. 
     The third emission control driver  325  supplies the emission control signals to the third emission control lines E 31  through E 3   k . For example, the third emission control driver  325  may sequentially supply the emission control signals to the third emission control lines E 31  through E 3   k . The emission control signals are used to control the emission time of the third pixels PXL 3 . For this purpose, the emission control signals may be set to have larger widths than the scan signals. 
     The emission control signals are set to have gate-off voltages (for example, high voltages) to turn off transistors in the pixels PXL 1 , PXL 2 , and PXL 3 . The scan signals may have gate-on voltages (for example, low voltages) to turn on the transistors in the pixels PXL 1 , PXL 2 , and PXL 3 . 
     The data driver  330  supplies the data signals to the data lines D 1  through Dm based on the data control signal DCS. The data signals supplied to the data lines D 1  through Dm are supplied to the pixels PXL 1  and PXL 2  selected by the scan signals. 
     The timing controller  350  supplies the gate control signals GCS 1  and GCS 2  generated based on the timing signals supplied from an external source to the scan drivers  310 ,  313 , and  315  and the emission control drivers  320 ,  323 , and  325  through the first signal line SL 1  and the second signal line SL 2 . The timing controller  350  supplies the data control signal DCS to the data driver  330  through the third signal line SL 3 . In addition, the timing controller  350  supplies the control signal LCS to the signal delay unit  340  through the operation control signal line SL 10 . 
     The start pulse and the clock signals are in each of the gate control signals GCS 1  and CGS 2 . The start pulse controls the timing of the first scan signal or the first emission control signal. The clock signals are used to shift the start pulse. The source start pulse and the clock signals are in the data control signal DCS. The source start pulse controls the sampling start point of time of the data. The clock signals are used to control the sampling operation. 
       FIG. 13  illustrates an embodiment of scan stages and a signal delay unit connected to the first signal line of  FIG. 12 . Referring to  FIG. 13 , the first scan driver  310 , the second scan driver  313 , the third scan driver  315 , and the signal delay unit  340  may be connected to the first signal line SL 1 . The first signal line SL 1  may supply the first gate control signal GCS 1  to the first scan driver  310  through the third scan driver  315 . The first scan driver  310  may be connected to one end of each of the first scan lines S 11  through S 1   n  and may supply the first scan signals to the first scan lines S 11  through S 1   n . The first scan driver  310  may include the scan stages SST 11  through SST 1   n.    
     Each of the scan stages SST 11  through SST 1   n  of the first scan driver  310  is connected to the one end of each of the first scan lines S 11  through S 1   n . The scan stages SST 11  through SST 1   n  may respectively supply the first scan signals to the first scan lines S 11  through S 1   n . At this time, the scan stages SST 11  through SST 1   n  may operate based on the first gate control signal GCS 1  supplied through the first signal line SL 1 . In addition, the scan stages SST 11  through SST 1   n  may be implemented by the same circuit. 
     The second scan driver  313  may be connected to one end of each of the second scan lines S 21  through S 2   j  and may supply the second scan signals to the second scan lines S 21  through S 2   j . The second scan driver  313  may include the scan stages SST 21  through SST 2   j.    
     Each of the scan stages SST 21  through SST 2   j  of the second scan driver  313  is connected to one end of each of the first scan lines S 21  through S 2   j . The scan stages SST 21  through SST 2   j  may supply the second scan signals to the second scan lines S 21  through S 2   j . At this time, the scan stages SST 21  through SST 2   j  may operate based on the first gate control signal GCS 1  supplied through the first signal line SL 1 . The scan stages SST 21  through SST 2   j  may be implemented by the same circuit. In addition, the scan stages SST 11  through SST 1   n  of the first scan driver  310  and the scan stages SST 21  through SST 2   j  of the second scan driver  313  may be implemented by the same circuit. 
     The third scan driver  315  may be connected to one end of each of the third scan lines S 31  through S 3   k  and may supply the third scan signals to the third scan lines S 31  through S 3   k . The third scan driver  315  may include a plurality of scan stages SST 31  through SST 3   k.    
     Each of the scan stages SST 31  through SST 3   j  of the third scan driver  315  is connected to one end of each of the third scan lines S 31  through S 3   k  and the scan stages SST 31  through SST 3   k  may supply the third scan signals to the third scan lines S 31  through S 3   k . At this time, the scan stages SST 31  through SST 3   k  may operate based on the first gate control signal GCS 1  supplied through the first signal line SL 1 . 
     The scan stages SST 31  through SST 3   k  may be implemented by the same circuit. 
     In addition, the scan stages SST 11  through SST 1   n  and SST 21  through SST 2   j  of the first scan driver  310  and the second scan driver  313  and the scan stages SST 31  through SST 3   k  of the third scan driver  315  may be implemented by the same circuit. 
     The signal delay unit  340  according to another embodiment may include a first signal delay unit  340   a  and a second signal delay unit  340   b . The control signal line SL 10  for supplying a signal for controlling an operation of the signal delay unit  340  may include a first control signal line SL 10   a  connected to the first signal delay unit  340   a  and a second control signal line SL 10   b  connected to the second signal delay unit  340   b.    
     The first signal delay unit  340   a  may include the first signal delay control capacitor CL 1 , the first signal delay control resistor RL 1 , and the first signal delay control transistor TL 1 . The first electrode of the first signal delay control capacitor CL 1  is connected to the ground and the second electrode of the first signal delay control capacitor CL 1  may be connected to the first signal delay control resistor RL 1 . 
     The first electrode of the first signal delay control resistor RL 1  is connected to the second electrode of the first signal delay control capacitor CL 1  and the second electrode of the first signal delay control resistor RL 1  may be connected to the first signal delay control transistor TL 1 . 
     The first electrode of the first signal delay control transistor TL 1  is connected to the second electrode of the first signal delay control resistor RL 1  and the second electrode of the first signal delay control transistor TL 1  may be connected to the first signal line SL 1 . The gate electrode of the first signal delay control transistor TL 1  may be connected to the first control signal line SL 10   a . The first signal delay control transistor TL 1  may be turned on when a first control signal LCS 1  is supplied to the first control signal line SL 10   a  and may delay the first gate control signal GCS 1  to correspond to a predetermined time constant τ1. 
     The time constant τ1 may be set in accordance with the resistance value of the first signal delay control resistor RL 1  and the capacitance value of the first signal delay control capacitor CL 1 . 
     The second signal delay unit  340   b  may include a second signal delay control capacitor CL 2 , a second signal delay control resistor RL 2 , and a second signal delay control transistor TL 2 . A first electrode of the second signal delay control capacitor CL 2  is connected to the ground and a second electrode of the second signal delay control capacitor CL 2  may be connected to the second signal delay control resistor RL 2 . A first electrode of the second signal delay control resistor RL 2  is connected to the second electrode of the second signal delay control capacitor CL 2  and a second electrode of the second signal delay control resistor RL 2  may be connected to the second signal delay control transistor TL 2 . 
     A first electrode of the second signal delay control transistor TL 2  is connected to the second electrode of the second signal delay control resistor RL 2  and a second electrode of the second signal delay control transistor TL 2  may be connected to the first signal line SL 1 . A gate electrode of the second signal delay control transistor TL 2  may be connected to the second control signal line SL 10   b . The second signal delay control transistor TL 2  may be turned on when a second control signal LCS 2  is supplied to the second control signal line SL 10   b  and may delay the first gate control signal GCS 1  by a value corresponding to a predetermined time constant τ2. 
     The time constant τ2 may be set in accordance with a resistance value of the second signal delay control resistor RL 2  and a capacitance value of the second signal delay control capacitor CL 2 . 
     The first signal delay control transistor TL 1  and the second signal delay control transistor TL 2  may be turned on while the third scan driver  315  operates (that is, in a period in which the third scan signals are output). 
     Therefore, the first gate control signal GCS 1  may be delayed by both the first signal delay unit  340   a  and the second signal delay unit  340   b . For example, the scan stages SST 31  through SST 3   k  of the third scan driver  315  may operate to correspond to the delayed first gate control signal GCS 1 . Therefore, the third scan signals output from the third scan lines S 31  through S 3   k  may be delayed based on the delayed first gate control signal GCS 1 . 
     Next, while the second scan driver  313  operates, the first signal delay control transistor TL 1  is turned on and the second signal delay control transistor TL 2  may be turned off. Therefore the first gate control signal GCS 1  may be delayed by the first signal delay unit  340   a . For example, the scan stages SST 21  through SST 2   j  of the second scan driver  313  may operate based on the delayed first gate control signal GCS 1 . Therefore, the second scan signals output from the second scan lines S 21  through S 2   j  may be delayed based on the delayed first gate control signal GCS 1 . 
     On the other hand, since both the first signal delay unit  340   a  and the second signal delay unit  340   b  operate while the third scan driver  315  is driven and only the first signal delay unit  340   a  operates while the second scan driver  313  is driven, the first gate control signal GCS 1  input to the scan stages SST 31  through SST 3   k  of the third scan driver  315  may be delayed more than the first gate control signal GCS 1  input to the scan stages SST 21  through SST 2   j  of the second scan driver  313 . 
     Since the loads of the second scan lines S 21  through S 2   j  are greater than the loads of the third scan lines S 31  through S 3   k , the second scan signals may be similar to the third scan signals. 
     Finally, the first signal delay control transistor TL 1  and the second signal delay control transistor TL 2  may be turned off while the first scan driver  310  operates. Thus, the first gate control signal GCS 1  that is not delayed may be input to the scan stages SST 11  through SST 1   n  of the first scan driver  310 . The first scan signals delayed by the loads of the first scan lines S 11  through S 1   n  may be output. For example, although the first gate control signal GCS 1  that is not delayed is input to the scan stages SST 11  through SST 1   n , the first scan signals may be similar to the second scan signals and the third scan signals. 
       FIG. 14  illustrates another embodiment of a substrate  113  which may include pixel regions and peripheral regions. The pixel regions AA 1 , AA 2 , and AA 3  may include a first pixel region AA 1 , a second pixel region AA 2 , and a third pixel region AA 3 . The second pixel region AA 2  and the third pixel region AA 3  may be at one side of the first pixel region AA 1 . For example, the second pixel region AA 2  and the third pixel region AA 3  may be protrusions that extend from parts of an upper side of the first pixel region AA 1 . In addition, the second pixel region AA 2  and the third pixel region AA 3  may be separate from each other. 
     The first pixel region AA 1  may have a greater area than the second pixel region AA 2  and the third pixel region AA 3 . For example, the width W 1  of the first pixel region AA 1  may be greater than the width W 2  of the second pixel region AA 2  and the width W 3  of the third pixel region AA 3 . The length L 1  of the first pixel region AA 1  may be greater than the length L 2  of the second pixel region AA 2  and the length L 3  of the third pixel region AA 3 . 
     The second pixel region AA 2  and the third pixel region AA 3  may have the same area or different areas. For example, the width W 2  of the second pixel region AA 2  may be equal to or different from the width W 3  of the third pixel region AA 3 . In addition, the length L 2  of the second pixel region AA 2  may be equal to or different from the length L 3  of the third pixel region AA 3 . 
     The peripheral regions NA 1 , NA 2 , and NA 3  may include a first peripheral region NA 1 , a second peripheral region NA 2 , and a third peripheral region NA 3 . The first peripheral region NA 1  be around the first pixel region AA 1  and may surround at least a part of the first pixel region AA 1 . The second peripheral region NA 2  be around the second pixel region AA 2  and may surround at least a part of the second pixel region AA 2 . The third peripheral region NA 3  be around the third pixel region AA 3  and may surround a part of the third pixel region AA 3 . The third peripheral region NA 3  and the second peripheral region NA 2  may or may not be connected in accordance with shapes of the substrate  113  and the pixel regions AA 1 , AA 2 , and AA 3 . 
     The pixels PXL 1 , PXL 2 , and PXL 3  may include first pixels PXL 1 , second pixels PXL 2 , and third pixels PXL 3 . For example, the first pixels PXL 1  are in the first pixel region AA 1 , the second pixels PXL 2  are in the second pixel region AA 2 , and the third pixels PXL 3  may be in the third pixel region AA 3 . In the first pixel region AA 1 , the same number of first pixels PXL 1  may be in each horizontal line. In addition, in the second pixel region AA 2 , the same number of second pixels PXL 2  may be in each horizontal line. In the third pixel region AA 3 , the same number of third pixels PXL 3  may be in each horizontal line. 
     As described above, since the width W 1  of the first pixel region AA 1  is greater than the width W 2  of the second pixel region AA 2  and the width W 3  of the third pixel region AA 3 , the number of first pixels PXL 1  in the horizontal lines of the first pixel region AA 1  may be greater than the number of second pixels PXL 2  in the horizontal lines of the second pixel region AA 2 . In addition, the number of first pixels PXL 1  in the horizontal lines of the first pixel region AA 1  may be greater than the number of third pixels PXL 3  in the horizontal lines of the third pixel region AA 3 . The substrate  113  may have various shapes so that the above-described pixel regions AA 1 , AA 2 , and AA 3  and peripheral regions NA 1 , NA 2 , and NA 3  may be set. 
       FIG. 15  illustrates another embodiment of a display device which may include the first pixels PXL 1 , the second pixels PXL 2 , the third pixels PXL 3 , a first scan driver  410 , a first emission control driver  420 , a second scan driver  413 , a second emission control driver  423 , a third scan driver  415 , a third emission control driver  425 , a data driver  430 , a signal delay unit  440 , and a timing controller  450 . 
     The first pixels PXL 1  are in the first pixel region AA 1  divided by the first scan lines S 11  through S 1   n , the first emission control lines E 11  through E 1   n , and the data lines D 1  through Dm. The first pixels PXL 1  receive the data signals from the data lines D 1  through Dm when the scan signals are supplied from the first scan lines S 11  through S 1   n . The first pixels PXL 1  that receive the data signals control the amount of current that flows from the first power source ELVDD to the second power source ELVSS via the OLEDs. 
     The second pixels PXL 2  are in the second pixel region AA 2  divided by the second scan lines S 21  through S 2   j , the second emission control lines E 21  through E 2   j , and the data lines Dm- 2  through Dm. The second pixels PXL 2  receive the data signals from the data lines Dm- 2  through Dm when the scan signals are supplied from the second scan lines S 21  through S 2   j . The second pixels PXL 2  that receive the data signals control the amount of current that flows from the first power source ELVDD to the second power source ELVSS via the OLEDs. 
     The third pixels PXL 3  are in the third pixel region AA 3  divided by third scan lines S 31  through S 3   j , second emission control lines E 31  through E 3   j , and data lines D 1  through D 3 . The third pixels PXL 3  receive the data signals from the data lines D 1  through D 3  when scan signals are supplied from the third scan lines S 31  through S 3   j . The third pixels PXL 3  control the amount of current that flows from the first power source ELVDD to the second power source ELVSS via OLEDs. 
     The first scan driver  410  supplies the scan signals to the first scan lines S 11  through S 1   n  based on the first gate control signal GCS 1  from the timing controller  450 . For example, the first scan driver  410  may sequentially supply the scan signals to the first scan lines S 11  through S 1   n . When the scan signals are sequentially supplied to the first scan lines S 11  through S 1   n , the first pixels PXL 1  are sequentially selected in units of horizontal lines. 
     The second scan driver  413  supplies the scan signals to the second scan lines S 21  through S 2   j  based on the first gate control signal GCS 1  from the timing controller  450 . For example, the second scan driver  413  may sequentially supply the scan signals to the second scan lines S 21  through S 2   j . When the scan signals are sequentially supplied to the second scan lines S 21  through S 2   j , the second pixels PXL 2  are sequentially selected in units of horizontal lines. 
     The third scan driver  415  supplies the scan signals to the third scan lines S 31  through S 3   j  based on the first gate control signal GCS 1  from the timing controller  450 . For example, the third scan driver  415  may sequentially supply the scan signals to the third scan lines S 31  through S 3   j . When the scan signals are sequentially supplied to the third scan lines S 31  through S 3   j , the third pixels PXL 3  are sequentially selected in units of horizontal lines. 
     The loads of the first scan lines S 11  through S 1   n  may be different from the loads of the second scan lines S 21  through S 2   j  and loads of the third scan lines S 31  through S 3   j . Since the width W 1  of the first pixel region AA 1  is greater than the width W 2  of the second pixel region AA 2  and the width W 3  of the third pixel region AA 3 , the length of the first scan lines S 11  through S 1   n  may be greater than the length of the second scan lines S 21  through S 2   j  and the length of the third scan lines S 31  through S 3   j . Therefore, the loads of the first scan lines S 11  through S 1   n  may be greater than the loads of the second scan lines S 21  through S 2   j  and the loads of the third scan lines S 31  through S 3   j.    
     As a result, differences in time constant may be generated among the scan signals supplied to the pixels PXL 1 , PXL 2 , and PXL 3 . Thus, the scan signals supplied to the first scan lines S 11  through S 1   n  have greater delay than the scan signals supplied to the second scan lines S 21  through S 2   j  and the third scan lines S 31  through S 3   j . Brightness differences may be generated among the first pixels PXL 1  through the third pixels PXL 3  due to the differences in time constant among the scan signals. 
     The signal delay unit  440  according to the present embodiment may delay the first gate control signal GCS 1  output from the timing controller  450  by a predetermined time constant and may transmit the delayed first gate control signal GCS 1  to at least one of the scan drivers  410 ,  413 , and  415 . For example, the signal delay unit  440  may delay the first gate control signal GCS 1  while the second scan driver  413  and the third scan driver  415  operate. In addition, the signal delay unit  440  may transmit the first gate control signal GCS 1  output from the timing controller  450  as it is while the first scan driver  410  operates. 
     The first emission control driver  420  supplies the emission control signals to the first emission control lines E 11  through E 1   n  based on the second gate control signal GCS 2  from the timing controller  450 . For example, the first emission control driver  420  may sequentially supply the emission control signals to the first emission control lines E 11  through E 1   n . The emission control signals are used to control the emission time of the first pixels PXL 1 . For this purpose, the emission control signals may have greater widths than the scan signals. 
     The second emission control driver  423  supplies the emission control signals to the second emission control lines E 21  through E 2   j . For example, the second emission control driver  423  may sequentially supply the emission control signals to the second emission control lines E 21  through E 2   j . The emission control signals are used to control the emission time of the second pixels PXL 2 . For this purpose, the emission control signals may be set to have greater widths than the scan signals. 
     The third emission control driver  425  supplies the emission control signals to the third emission control lines E 31  through E 3   j . For example, the third emission control driver  425  may sequentially supply the emission control signals to the third emission control lines E 31  through E 3   j . The emission control signals are used to control the emission time of the third pixels PXL 3 . For this purpose, the emission control signals may be set to have greater widths than the scan signals. 
     On the other hand, the emission control signals are set to have gate-off voltages (for example, high voltages) to turn off transistors in the pixels PXL 1 , PXL 2 , and PXL 3 . The scan signals may have gate-on voltages (for example, low voltages) to turn on the transistors in the pixels PXL 1 , PXL 2 , and PXL 3 . 
     The data driver  430  supplies the data signals to the data lines D 1  through Dm based on the data control signal DCS. The data signals supplied to the data lines D 1  through Dm are supplied to the pixels PXL 1  and PXL 2  selected by the scan signals. 
     The timing controller  450  supplies the gate control signals GCS 1  and GCS 2  generated based on the timing signals supplied from the outside to the scan drivers  410 ,  413 , and  415  and the emission control drivers  420 ,  423 , and  425  and supplies the data control signal DCS to the data driver  430 . 
     The start pulse and the clock signals are in each of the gate control signals GCS 1  and CGS 2 . The start pulse controls the timing of the first scan signal or the first emission control signal. The clock signals are used for shifting the start pulse. The source start pulse and the clock signals are in the data control signal DCS. The source start pulse controls the sampling start point of time of the data. The clock signals are used to control the sampling operation. 
     In some embodiments, the substrates  110 ,  111 ,  112 , and  113  have angulate edges. In another embodiments, substrates  110 ,  111 ,  112 , and  113  may have at least some edges that are round. 
     The methods, processes, and/or operations described herein may be performed by code or instructions to be executed by a computer, processor, controller, or other signal processing device. The computer, processor, controller, or other signal processing device may be those described herein or one in addition to the elements described herein. Because the algorithms that form the basis of the methods (or operations of the computer, processor, controller, or other signal processing device) are described in detail, the code or instructions for implementing the operations of the method embodiments may transform the computer, processor, controller, or other signal processing device into a special-purpose processor for performing the methods herein. 
     The drivers, controllers, and other processing features described herein may be implemented in logic which, for example, may include hardware, software, or both. When implemented at least partially in hardware, the drivers, controllers, and other processing features may be, for example, any one of a variety of integrated circuits including but not limited to an application-specific integrated circuit, a field-programmable gate array, a combination of logic gates, a system-on-chip, a microprocessor, or another type of processing or control circuit. 
     When implemented in at least partially in software, the drivers, controllers, and other processing features may include, for example, a memory or other storage device for storing code or instructions to be executed, for example, by a computer, processor, microprocessor, controller, or other signal processing device. The computer, processor, microprocessor, controller, or other signal processing device may be those described herein or one in addition to the elements described herein. Because the algorithms that form the basis of the methods (or operations of the computer, processor, microprocessor, controller, or other signal processing device) are described in detail, the code or instructions for implementing the operations of the method embodiments may transform the computer, processor, controller, or other signal processing device into a special-purpose processor for performing the methods described herein. 
     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, 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 embodiments in the claims.