Patent Publication Number: US-2023135044-A1

Title: Organic light emitting display device

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a divisional of U.S. patent application Ser. No. 16/714,789, filed on Dec. 15, 2019, which claims priority from Korean Patent Application No. 10-2018-0168725, filed on Dec. 24, 2018, which are hereby incorporated by reference in their entirety for all purposes as if fully set forth herein. 
    
    
     BACKGROUND 
     Field of the Disclosure 
     The present disclosure relates to a display device, and more particularly, to an organic light-emitting display. Although the present disclosure is suitable for a wide scope of applications, it is particularly suitable for securing a dropping region of an organic light-emitting material while maintaining a preset area ratio between subpixels of the organic light-emitting display. 
     Description of the Background 
     Various display devices capable of reducing weight and volume, which is disadvantages of the cathode ray tube, are developed. Such display devices can be implemented as a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), an organic light-emitting diode (OLED) display, etc. 
     An organic light-emitting display is a self-emission device without an additional light source, and has advantages in fast response time and high emission efficiency, high brightness and wide viewing angle. Furthermore, the organic light-emitting display can be implemented as a flexible display device because elements can be formed on a flexible substrate, such as plastic. 
     As large-area and high-resolution organic light-emitting displays are recently required, multiple subpixels are included in a single panel. In general, a mask is used for patterning red (R), green (G), and blue (B) subpixels. Accordingly, in order to implement a large-area display device, a corresponding large-area fine metal mask (FMM) is necessary. However, as the display device has a larger area, an organic light-emitting material to form an emission layer may not be deposited in place, which may be caused by the FMM drooping. 
     In order to solve such a problem in the above-described deposition method using the mask, a solution process (or soluble process) that is simple and advantageous for a large area attracts attention. The solution process enables large area patterning without a mask through inkjet printing or nozzle printing, and has a very high material use ratio of about 50 to 80% compared to the vacuum deposition having a material use ratio of 10% or less. Furthermore, the solution process provides excellent thermal stability and morphology characteristics because it has a higher glass transition temperature compared to a thin vacuum deposition film. 
     When an organic emission layer is formed with the solution process, a color mixture failure in which organic light-emitting materials of different colors are mixed may occur because the organic light-emitting materials may not be dropped in place. In order to prevent the color mixture failure, it is necessary to secure a sufficient dropping region of an organic light-emitting material is dropped by taking a process margin into consideration. In a high-resolution display device having a high pixel per inch (PPI), however, it is difficult to secure a dropping region because the size per pixel is very small. 
     SUMMARY 
     Accordingly, the present disclosure is directed to an organic light-emitting display that substantially obviates one or more of problems due to limitations and disadvantages of the prior art. 
     Additional features and advantages of the disclosure will be set forth in the description which follows and in part will be apparent from the description, or may be learned by practice of the invention. Other advantages of the present disclosure will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. 
     The present disclosure provides an organic light-emitting display capable of securing the dropping region of an organic light-emitting material while maintaining a preset area ratio between subpixels. 
     In an aspect, an organic light-emitting display includes a substrate, first electrodes, and a bank. The substrate has a plurality of subpixels arranged in a row direction and a column direction crossing the row direction. The first electrodes are allocated to the subpixels, respectively, and include (1-1) electrodes arranged in a (3n-2) (n is a natural number of 1 or more) column, (1-2) electrodes arranged in a (3n-1) column, and a (1-3) electrode arranged in a 3n column. The bank has an opening exposing the first electrodes. The (1-1) electrode includes a convex part protruded toward the (1-3) electrode. The (1-3) electrode comprises a concave part opposing the convex part. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of the disclosure, illustrate aspects of the disclosure and together with the description serve to explain the principles of the disclosure. 
       In the drawings: 
         FIG.  1    is a schematic diagram of an organic light-emitting display device; 
         FIG.  2    is a schematic circuit diagram of a subpixel of the organic light-emitting display device; 
         FIG.  3    is a detailed circuit diagram of the subpixel of the organic light-emitting display device; 
         FIG.  4    a plan view schematically showing a layout of subpixels according to an aspect of the present disclosure; 
         FIG.  5    is a cross-sectional view taken along dotted line I-I′ of  FIG.  4   ; 
         FIG.  6    is a plan view schematically showing a display device according to the present disclosure; 
         FIG.  7    shows cross-sectional views taken along lines II-II′, III-III′, and IV-IV′ of  FIG.  6   ; 
         FIG.  8    is a schematic diagram for illustrating the shape and position relation of first electrodes; 
         FIG.  9    is a schematic diagram for illustrating an effect of the present disclosure; 
         FIGS.  10 A to  10 B,  11 A to  11 B,  12 A to  12 B and  13 A to  13 B  are diagrams for illustrating a process of forming first electrodes, a bank, and an organic emission layer in a time series; 
         FIG.  14    is a schematic diagram for illustrating another example of the shape of a first electrode and a second bank; 
         FIG.  15    is a plan view schematically showing a display device according to an aspect of the present disclosure; 
         FIG.  16    shows cross-sectional views taken along lines VIII-VIII′, IX-IX′ and X-X′ of  FIG.  15   ; 
         FIG.  17    is a plan view schematically showing a display device according to another aspect of the present disclosure; and 
         FIG.  18    shows cross-sectional views taken along lines A-A′, B-B′ and C-C′ of  FIG.  17   . 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, aspects of the present disclosure are described with reference to the accompanying drawings. Throughout the specification, the same reference numeral substantially denotes the same element. In the following description, a detailed description of known technology or element related to the present disclosure will be omitted if it is deemed to make the gist of the present disclosure unnecessarily vague. In describing several aspects, the same element is representatively described at the introductory part of this specification, and may be omitted in other aspects. 
     Terms including ordinal numbers, such as the first and the second, may be used to describe various elements, but the elements are not limited by the terms. The terms are used to only distinguish one element from the other element. 
       FIG.  1    is a schematic diagram of an organic light-emitting display device.  FIG.  2    is a schematic circuit diagram of a subpixel of the organic light-emitting display device.  FIG.  3    is a detailed circuit diagram of the subpixel of the organic light-emitting display device. 
     As shown in  FIG.  1   , the organic light-emitting display device  10  includes an image processor  11 , a timing controller  12 , a data driver  13 , a scan driver  14  and a display panel  20 . 
     The image processor  11  outputs a data enable signal DE along with an externally supplied data signal DATA. The image processor  11  may output one or more of a vertical sync signal, a horizontal sync signal and a clock signal in addition to the data enable signal DE, but the signals are omitted, for convenience of description. 
     The timing controller  12  is supplied with the data signal DATA along with the data enable signal DE or driving signals, including the vertical sync signal, the horizontal sync signal and the clock signal, from the image processor  11 . The timing controller  12  outputs a gate timing control signal GDC for controlling operating timing of the scan driver  14  and a data timing control signal DDC for controlling operating timing of the data driver  13  based on the driving signal. 
     The data driver  13  converts a data signal DATA, supplied by the timing controller  12 , into a gamma reference voltage by sampling and latching the data signal DATA in response to a data timing control signal DDC supplied by the timing controller  12 , and outputs the gamma reference voltage. The data driver  13  outputs the data signal DATA through data lines DL 1 ˜DLn. The data driver  13  may be formed in an integrated circuit (IC) form. 
     The scan driver  14  outputs a scan signal in response to a gate timing control signal GDC supplied by the timing controller  12 . The scan driver  14  outputs the scan signal through gate lines GL 1 ˜GLm. The scan driver  14  is formed in an IC form or formed in the display panel  20  in a gate in panel (GIP) manner. 
     The display panel  20  displays an image in accordance with a data signal DATA and scan signal supplied by the data driver  13  and the scan driver  14 . The display panel  20  includes subpixels  50  operating to display an image. 
     The subpixels  50  include a red subpixel, a green subpixel and a blue subpixel or include a white subpixel, a red subpixel, a green subpixel and a blue subpixel. The subpixels  50  may have one or more different emission regions depending on their emission characteristics. 
     As shown in  FIG.  2   , one subpixel includes a switching transistor  30 , a driving transistor  35 , a capacitor  40 , a compensation circuit  45  and an organic light-emitting diode (OLED)  60 . 
     The switching transistor  30  performs a switching operation in response to a scan signal supplied through a first gate line  32  so that a data signal supplied through a first data line  36  is stored in the capacitor  45  as a data voltage. The driving transistor  35  operates in response to a data voltage stored in the capacitor  45  so that a driving current flows between a power source line  42  (high potential voltage) and a cathode power source line  44  (low potential voltage). The OLED  60  operates to emit light in response to a driving current formed by the driving transistor  35 . 
     The compensation circuit  45  is a circuit added within the subpixel in order to compensate for a threshold voltage of the driving transistor  35 . The compensation circuit  45  is configured with one or more transistors. The configuration of the compensation circuit  45  is very various depending on an external compensation method, and an example thereof is described below. 
     As shown in  FIG.  3   , the compensation circuit  45  includes a sensing transistor  65  and a sensing line  70  (or reference line). The sensing transistor  65  is connected between the source electrode of the driving transistor  35  and the anode electrode (hereinafter referred to as “sensing node”) of the OLED  60 . The sensing transistor  65  operates to supply the sensing node of the driving transistor  35  with an initialization voltage (or sensing voltage) transferred through the sensing line  70  or to sense a voltage or current of the sensing node of the driving transistor  35  or the sensing line  70 . 
     The switching transistor  30  has a first electrode connected to the first data line  36  and has a second electrode connected to the gate electrode of the driving transistor  35 . The driving transistor  35  has a first electrode connected to the power source line  42  and has a second electrode connected to the anode electrode of the OLED  60 . The capacitor  40  has a first electrode connected to the gate electrode of the driving transistor  35 , and has a second electrode connected to the anode electrode of the OLED  60 . The OLED  60  has the anode electrode connected to the second electrode of the driving transistor  35 , and has a cathode electrode connected to the second power source line  44 . The sensing transistor  65  has a first electrode connected to the sensing line  70 , and has a second electrode connected to the anode electrode of the OLED  60 , that is, a sensing node, and the second electrode of the driving transistor  35 . 
     The operating time of the sensing transistor  65  may be similar/identical with or different from that of the switching transistor  30  depending on an external compensation algorithm (or the configuration of a compensation circuit). For example, the switching transistor  30  may have a gate electrode connected to a first gate line  32 , and the sensing transistor  65  may have a gate electrode connected to a second gate line  34 . In this case, a scan signal Scan is transferred to the first gate line  32 , and a sensing signal Sense is transferred to the second gate line  34 . For another example, the first gate line  32  connected to the gate electrode of the switching transistor  30  and the second gate line  34  connected to the gate electrode of the sensing transistor  65  may be connected to be shared. 
     The sensing line  70  may be connected to a data driver. In this case, the data driver may sense the sensing node of a subpixel during the non-display period or N frame (N is an integer of 1 or more) period of a real-time image, and may generate a result of the sensing. The switching transistor  30  and the sensing transistor  65  may be turned on at the same time. In this case, a sensing operation through the sensing line  70  based on a time-division method of the data driver and a data output operation of outputting a data signal are separated. 
     In addition, a compensation target according to a result of the sensing may be a data signal of a digital form, a data signal of an analog form or gamma. Furthermore, the compensation circuit generating a compensation signal (or compensation voltage) based on a result of the sensing may be implemented within the data driver, within the timing controller or as a separate circuit. 
     A light blocking layer  80  may be positioned only under the channel region of the driving transistor  35  or may be positioned under the channel region of the switching transistor  30  and the sensing transistor  65  in addition to the driving transistor  35 . The light blocking layer  80  may be used to simply block external light or may be used as an electrode that connects the light blocking layer  80  and a different electrode or line or configures a capacitor. Accordingly, the light blocking layer  80  is selected as the metal layer of plural layers (e.g., plural layers of heterogeneous metals) to have a light-shielding characteristic. 
     In addition,  FIG.  3    has been illustrated as being a subpixel having a 3transistor (T) (capacitor (C) (3T1C) structure, including the switching transistor  30 , the driving transistor  35 , the capacitor  40 , the OLED  60 , and the sensing transistor  65 . If the compensation circuit  45  is added, a subpixel may have a structure of 3T2C, 4T2C, 5T1C or 6T2C. 
       FIG.  4    schematically shows a plan layout of subpixels according to the present disclosure.  FIG.  5    is a cross-sectional view taken along dotted line I-I′ of  FIG.  4   . 
     Referring to  FIG.  4   , a first subpixel SP 1 , a second subpixel SP 2  and a third subpixel SP 3  are formed on the display region of a substrate. An OLED (light-emitting device) and a circuit, including the switching transistor  30 , the sensing transistor  65  and the driving transistor  35  driving the OLED, are formed in each of the first subpixel SP 1 , the second subpixel SP 2  and the third subpixel SP 3 . The OLEDs of the first subpixel SP 1 , second subpixel SP 2  and third subpixel SP 3  emit light in accordance with operations of the switching transistor  30 , sensing transistor  65  and driving transistor  35 , respectively. A power source line  42 , a sensing line  70 , and first to third data lines  36 ,  38 , and  52  are disposed between the first subpixel SP 1 , the second subpixel SP 2  and the third subpixel SP 3 . First and second gate lines  32  and  34  are disposed to traverse the first subpixel SP 1 , the second subpixel SP 2  and the third subpixel SP 3 . 
     Wires, such as the power source line  42 , the sensing line  70 , the first to the third data lines  36 ,  38 , and  52 , and electrodes configuring a thin film transistor (TFT) are disposed in different layers, but are electrically connected due to a contact through a contact hole (or via hole). The sensing line  70  is connected to the sensing transistor  65  of each of the first subpixel SP 1 , second subpixel SP 2  and third subpixel SP 3  through a sensing connection line  72 . The power source line  42  is connected to the driving transistor  35  of each of the first subpixel SP 1 , second subpixel SP 2  and third subpixel SP 3  through a power source connection line  74 . The first and the second gate lines  32  and  34  are connected to the sensing and switching transistors  65  and  30  of each of the first subpixel SP 1 , second subpixel SP 2  and third subpixel SP 3 . 
     The first subpixel SP 1  may be a red subpixel, the second subpixel SP 2  may be a green subpixel, and the third subpixel SP 3  may be a blue subpixel. However, the positions of the subpixels may be changed. 
     A cross-sectional structure of the first subpixel of the first to the third subpixels is described below as an example with reference to  FIG.  5   . 
     Referring to  FIG.  5   , a light blocking layer  80  is positioned on a substrate  100 . The light blocking layer  80  functions to prevent a photocurrent from occurring in a transistor by blocking the incidence of external light. A buffer layer  105  is positioned on the light blocking layer  80 . The buffer layer  105  functions to protect a transistor, formed in a subsequent process, against impurities such as alkali ions drained from the light blocking layer  80 . The buffer layer  105  may be a silicon oxide (SiOx) layer, a silicon nitride (SiNx) layer or a multiple layer of them. 
     The semiconductor layer  110  of a driving transistor  35  is positioned on the buffer layer  105 . The semiconductor layer  110  may be made of a silicon semiconductor, an oxide semiconductor or an organic matter semiconductor. The silicon semiconductor may be formed using amorphous silicon or using polycrystalline silicon crystallized from amorphous silicon. The oxide semiconductor may be made of any one of zinc oxide (ZnO), indium zinc oxide (InZnO), indium gallium zinc oxide (InGaZnO) or zinc tin oxide (ZnSnO). The organic matter semiconductor may be made of a small molecule or polymetric molecule organic matter, such as merocyanine, phthalocyanine, pentacene and thiophenpolymer. The semiconductor layer  110  includes a drain region and source region including p or n type impurities, and includes a channel between the drain region and the source region. 
     A gate insulating film  115  is positioned on the semiconductor layer  110 . The gate insulating film  115  may be a silicon oxide (SiOx) layer, a silicon nitride (SiNx) layer or a multiple layer of them. A gate electrode  120  is positioned on the gate insulating film  115  in a given region of the semiconductor layer  110 , that is, a position corresponding to a channel if impurities have been implanted,. The gate electrode  120  may be formed of one of molybdenum (Mo), aluminum (Al), chrome (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd) and copper (Cu) or an alloy of them. Furthermore, the gate electrode  120  may be a multiple layer of one of molybdenum (Mo), aluminum (Al), chrome (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd) and copper (Cu) or an alloy of them. For example, the gate electrode  120  may be a dual layer of made of molybdenum/aluminum-neodymium or molybdenum/aluminum. 
     An interlayer dielectric film  125  for insulating the gate electrode  120  is positioned on the gate electrode  120 . The interlayer dielectric film  125  may be a silicon oxide (SiOx) film, a silicon nitride (SiNx) film or a multiple layer of them. A source electrode  130  and a drain electrode  135  are disposed on the interlayer dielectric film  125 . The source electrode  130  and the drain electrode  135  are connected to the semiconductor layer  110  through contact holes  137 , respectively, exposing the source and drain regions of the semiconductor layer  110 . The source electrode  130  and the drain electrode  135  may be configured with a single layer or a multiple layer. If the source electrode  130  and the drain electrode  135  are configured with a single layer, they may be one of molybdenum (Mo), aluminum (Al), chrome (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd) and copper (Cu) or an alloy of them. Furthermore, if the source electrode  130  and the drain electrode  135  are configured with a multiple layer, they may be a dual layer of molybdenum/aluminum-neodymium or a triple layer of titanium/aluminum/titanium, molybdenum/aluminum/molybdenum or molybdenum/aluminum-neodymium/molybdenum. A first data line  36  is positioned in the region separated from the driving transistor  35 , and a cathode power source line  44  is positioned in a different region. 
     Accordingly, the driving transistor  35 , including the semiconductor layer  110 , the gate electrode  120 , the source electrode  130  and the drain electrode  135 , is configured. 
     A passivation film  140  is positioned on the substrate  100  including the driving transistor  35 . The passivation film  140  is an insulating film protecting an underlying element, and may be a silicon oxide (SiOx) film, a silicon nitride (SiNx) film or a multiple layer of them. A first via hole  142  exposing the drain electrode  135  of the underlying driving transistor  35  is positioned in some region of the passivation film  140 . A second via hole  143  exposing the cathode power source line  44  is positioned in some region of the passivation film  140 . 
     An overcoat layer  150  is positioned on the passivation film  140 . The overcoat layer  150  may be a planarization film for reducing the step of a lower structure, and is made of an organic matter, such as polyimide, benzocyclobutene series resin or acrylate. A third via hole  152  exposing the drain electrode  135  by exposing the first via hole  142  of the passivation film  140  is positioned in some region of the overcoat layer  150 . A fourth via hole  154  exposing the cathode power source line  44  by exposing the second via hole  143  of the passivation film  140  is positioned in some region of the overcoat layer  150 . 
     An OLED  60  is formed on the overcoat layer  150 . The OLED  60  includes a first electrode  160  connected to the driving transistor  35 , a second electrode  180  opposite the first electrode  160 , and an organic emission layer  175  interposed between the first electrode  160  and the second electrode  180 . The first electrode  160  may be an anode electrode, and the second electrode  180  may be a cathode electrode. 
     The first electrode  160  is positioned on the overcoat layer  150 , and may be connected to the drain electrode  135  of the driving transistor  35  through the third via hole  152  of the overcoat layer  150  and the first via hole  142  of the passivation film  140 . One first electrode  160  may be allocated to each subpixel, but the present disclosure is not limited thereto. The first electrode  160  may be made of a transparent conductive material, such as indium tin oxide (ITO), indium zinc oxide (ZTO) or zinc oxide (ZnO), to function as a transmission electrode or may include a reflection layer to function as a reflection electrode, in accordance with an adopted emission method. The reflection layer may be made of aluminum (Al), copper (Cu), silver (Ag), nickel (Ni) or an alloy of them and may be made of a silver/palladium/copper (APC) alloy. 
     A connection pattern  165  connected to the cathode power source line  44  through the fourth via hole  154  of the overcoat layer  150  and the second via hole  143  of the passivation film  140  is positioned on the overcoat layer  150  separated from the first electrode  160 . The connection pattern  165  has the same structure as the first electrode  160 . 
     A bank  170  is positioned on the substrate  100  in which the first electrode  160  has been formed. The bank  170  includes a first bank  172  having a first opening OA 1  exposing the first electrode  160 . The bank  170  includes the second bank  176  having a second opening OA 2 . The second opening OA 2  has a larger area than the first opening OA 1 , and may expose a part of the first bank  172 . 
     Furthermore, a first bank  172  includes a third opening OA 3  exposing the connection pattern  165 . A second bank  176  includes a fourth opening OA 4  exposing the part of the first bank  172  and the connection pattern  165 . The fourth opening OA 4  has a larger area than the third opening OA 3 , and may expose the part of the first bank  172 . 
     An organic emission layer  175  is positioned on the substrate  100  in which the bank  170  has been formed. The organic emission layer  175  includes an emission layer (EL), and may further include any one or more of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL) and an electron injection layer (EIL). The organic emission layer  175  is coated and dried by a solution process (or, soluble process), such as inkjet printing or nozzle coating, thus the top of the organic emission layer  175  with which the organic emission layer  175  and the bank  170  come into contact may have a round shape. 
     The second electrode  180  is positioned on the organic emission layer  175 . The second electrode  180  may be widely formed on the entire surface of the substrate  100 . The second electrode  180  may function as a transmission electrode or a reflection electrode in accordance with an adopted emission method. If the second electrode  180  is a transmission electrode, it may be made of a transparent conductive material, such as indium tin oxide (ITO) or indium zinc oxide (ZTO) or may be made of magnesium (Mg), calcium (Ca), aluminum (Al), silver (Ag) or an alloy of them having a thin thickness through which light can transmit. The second electrode  180  is connected to the connection pattern  165  through the third opening OA 3  of the first bank  172  and the fourth opening OA 4  of the second bank  176 , thus being connected to the cathode power source line  44 . 
     An opposite substrate  190  opposite the substrate  100  in which the driving transistor  35  and the OLED  60  have been formed is positioned. The opposite substrate  190  seals the substrate  100 , and includes a color filter  195  at the bottom thereof. The color filter  195  may be a red color filter, and functions to make thick red color coordinates. For example, if a first subpixel is a red subpixel, the opposite substrate  190  may have a red color filter in the region corresponding to the first subpixel. Furthermore, any color filter may not be provided in a region that belongs to the opposite substrate  190  and that corresponds to a second subpixel, that is, a green subpixel, and a third subpixel, which is, a blue subpixel. However, such examples are merely examples, and a color filter of a corresponding color may be provided in each subpixel. The structure of  FIG.  5    may be identically applied to other subpixels in addition to the above-described subpixel. 
     Hereinafter, there is proposed a new structure capable of securing the area of a dropping region while securing a preset area ratio between subpixels. 
       FIG.  6    is a plan view schematically showing a display device according to an aspect of the present disclosure.  FIG.  7    shows cross-sectional views taken along lines III-III′, and IV-IV′ of  FIG.  6   .  FIG.  8    is a diagram for illustrating the shape and position relation of first electrodes. 
     Referring to  FIGS.  6  and  7   , the display device according to the present disclosure includes a substrate  100  in which subpixels SP have been arranged. A circuit element layer  101  and an OLED  60  driven by the elements of the circuit element layer  101  are disposed on the substrate  100 . 
     A signal line for applying a driving signal to the OLED  60  and electrodes may be arranged in the circuit element layer  101 . The signal line and electrodes may be separated with at least one insulating layer interposed therebetween if necessary. If the organic light-emitting display is implemented by an active matrix (AM) method, the circuit element layer  101  may further include a transistor allocated to each subpixel SP. In this case, the subpixel SP may have a structure, such as that shown in  FIG.  5   , but is not limited thereto. 
     The OLED  60  includes a first electrode  160 , a second electrode  180 , and an organic emission layer  175  interposed between the first electrode  160  and the second electrode  180 . The first electrode  160  may be an anode, and the second electrode  180  may be a cathode. 
     More specifically, the subpixels SP are arranged in a row direction (e.g., X-axis direction) and a column direction (e.g., Y-axis direction) which cross each other. Subpixels SP adjacently arranged in the row direction may emit light of different colors, and subpixels SP adjacently arranged in the column direction may emit light of the same color. 
     The subpixels include a first subpixel in a (3n-2) (n is a natural number of 1 or more) column, a second subpixel arranged in a (3n-1) column, and a third subpixel arranged in a 3n column. That is, the first subpixel, second subpixel and third subpixel are sequentially arranged alternately in the row direction. The first subpixel may emit light of a first color. The second subpixel may emit light of a second color. The third subpixel may emit light of a third color. The first color may be red, the second color may be green, and the third color may be blue, but are not limited thereto. 
     The first electrode  160  of the OLED  60  is positioned in the subpixel SP. One first electrode  160  may be allocated to one subpixel SP. Adjacent first electrodes  160  are spaced apart at predetermined intervals. 
     The first electrodes  160  include a (1-1) electrode  160 - 1 , a (1-2) electrode  160 - 2 , and a (1-3) electrode  160 - 3 . The (1-1) electrode  160 - 1 , (1-2) electrode  160 - 2 , and (1-3) electrode  160 - 3  have different plane shapes. The (1-1) electrode  160 - 1  may be allocated to the first subpixel, the (1-2) electrode  160 - 2  may be allocated to the second subpixel, and the (1-3) electrode  160 - 3  may be allocated to the third subpixel. 
     The (1-1) electrodes  160 - 1  are disposed in the (3n-2) column. The (1-1) electrodes  160 - 1  are sequentially disposed in the column direction. The (1-2) electrodes  160 - 2  are disposed in the (3n-1) column. The (1-2) electrodes  160 - 2  are sequentially disposed in the column direction. The (1-3) electrodes  160 - 3  are disposed in the 3n column. The (1-3) electrodes  160 - 3  are sequentially disposed in the column direction. Accordingly, the (1-1) electrode  160 - 1 , (1-2) electrode  160 - 2 , and (1-3) electrode  160 - 3  are sequentially disposed alternately in the row direction. 
     Referring further to  FIG.  8   , the (1-1) electrode  160 - 1  has a convex part  161  on its one side. The convex part  161  may be disposed on one side of the (1-1) electrode  160 - 1  not adjacent to the (1-2) electrode  160 - 2 . The convex part  161  may be positioned on one side of the (1-1) electrode  160 - 1  adjacent to the (1-3) electrode  160 - 3 . The area of the region in which the convex part  161  of the (1-1) electrode  160 - 1  has been formed has a wide area compared to other regions. The convex part  161  may be protruded toward the (1-3) electrode  160 - 3  in a region adjacent to the (1-3) electrode  160 - 3 . 
     The (1-2) electrode  160 - 2  may have a square or an oblong. 
     The (1-3) electrode  160 - 3  has a concave part  163  on its one side. The concave part  163  may be positioned on one side of the (1-3) electrode  160 - 3  not adjacent to the (1-2) electrode  160 - 2 . The concave part  163  may be positioned on one side of the (1-1) electrode  160 - 1  adjacent to the (1-1) electrode  160 - 1 . In the region in which the (1-1) electrode  160 - 1  and the (1-3) electrode  160 - 3  are adjacently disposed, the convex part  161  of the (1-1) electrode  160 - 1  is opposite the concave part  163  of the (1-3) electrode  160 - 3 . In the region in which the (1-1) electrode  160 - 1  and the (1-3) electrode  160 - 3  are adjacently disposed, the convex part  161  of the (1-1) electrode  160 - 1  may be inserted in the concave part  163  of the (1-3) electrode  160 - 3 . 
     A bank  170  is positioned on the substrate  100  in which the first electrode  160  has been formed. The bank  170  includes a first bank  172  and a second bank  176 . 
     The first bank  172  includes a first opening OA 1  exposing at least one part of the first electrode  160 . The first bank  172  may be positioned to cover one side of the first electrodes  160  between first electrodes  160  adjacent in the column direction. 
     A plurality of the first openings OA 1  is arranged in parallel in the column direction. Each of the first openings OA 1  is extended in the row direction, thus exposing the (1-1) electrode  160 - 1 , (1-2) electrode  160 - 2 , and (1-3) electrodes  160 - 3  disposed in the row direction together. In other words, the first bank  172  may be positioned between first electrodes  160  adjacent in the column direction, and may partition subpixels SP adjacent in the column direction. That is, the first bank  172  may be positioned between (1-1) electrodes  160 - 1 , between (1-2) electrodes  160 - 2 , and between (1-3) electrodes  160 - 3  adjacent in the column direction. 
     The first bank  172  may be formed in a relatively thin thickness so that it is covered by the organic emission layer  175  to be formed subsequently. The first bank  172  may have a hydrophilic property. For example, the first bank  172  may be made of a hydrophilic inorganic insulating material, such as silicon oxide (SiO2) or silicon nitride (SiNx). The first bank  172  is a thin film of a hydrophilic component provided to prevent a wettability failure attributable to the hydrophobic property of the first electrode  160 , and functions to well spread an organic light-emitting material having the hydrophilic property. 
     The second bank  176  is positioned on the substrate  100  in which the first bank  172  has been formed. The second bank  176  includes a second opening OA 2  exposing at least one part of the first electrode  160 . A plurality of the second openings OA 2  is disposed in parallel in the row direction and extended in the column direction. The second opening OA 2  is extended in the column direction, thus exposing the plurality of first electrodes  160  disposed in the column direction. The width of the second bank  176  may be selected as a minimum width, which is configured so that organic light-emitting materials of different colors dropped to adjacent second openings OA 2  are not mixed and which is possible in process. 
     More specifically, the second bank  176  is positioned between (1-1) electrodes  160 - 1  arranged in the (3n-2) column and (1-2) electrodes  160 - 2  which are arranged in the (3n-1) column and are adjacent to the (1-1) electrodes  160 - 1 . That is, subpixels arranged in the (3n-2) column and subpixels arranged in the (3n-1) column may be partitioned by the second bank  176 . In this case, the second bank  176  may be extended in the column direction in a straight-line form between the (1-1) electrodes  160 - 1  arranged in the (3n-2) column and the (1-2) electrodes  160 - 2  arranged in the (3n-1) column. 
     The second bank  176  is positioned between (1-2) electrodes  160 - 2  arranged in the (3n-1) column and (1-3) electrodes  160 - 3  which are arranged in the  3   n  column and are adjacent to the (1-2) electrodes  160 - 2 . That is, subpixels arranged in the (3n-1) column and subpixels arranged in the  3   n  column may be partitioned by the second bank  176 . In this case, the second bank  176  may be extended in the column direction in a straight-line form between the (1-2) electrodes  160 - 2  arranged in the (3n-1) column and the (1-3) electrodes  160 - 3  arranged in the  3   n  column. 
     The second bank  176  is positioned between (1-3) electrodes  160 - 3  arranged in the 3n column and (1-1) electrodes  160 - 1  which are arranged in the (3n-2) column and are adjacent to the (1-3) electrodes  160 - 3  in the row direction. That is, subpixels arranged in the 3n column and subpixels arranged in the (3n-2) column may be partitioned by the second bank  176 . In this case, the second bank  176  may be extended in the column direction in zigzag form between the (1-3) electrodes  160 - 3  arranged in the 3n column and the (1-1) electrodes  160 - 1  arranged in the (3n-2) column. 
     A (2-1) opening OA 2 - 1  exposing the (1-1) electrodes  160 - 1  arranged in the (3n-2) column, a (2-2) opening OA 2 - 2  exposing the (1-2) electrodes  160 - 2  arranged in the (3n-1) column, and (2-3) openings OA 2 - 3  exposing the (1-3) electrodes  160 - 3  arranged in the 3n column have different areas and shapes. 
     A part that belongs to the (2-1) opening OA 2 - 1  and that exposes the convex parts  161  of the (1-1) electrodes  160 - 1  may be configured to have a relatively wide width compared to a part exposing other parts of the (1-1) electrodes  160 - 1 . Accordingly, a part of the (2-1) opening OA 2 - 1  exposing the convex part  161  can satisfy a minimum width which may be set by taking into consideration the amount of dropping of an organic light-emitting material and a process margin. In this case, a part of the (2-1) opening OA 2 - 1  exposing the (1-1) electrode  160 - 1  may be assigned as a dropping region DP to which an organic light-emitting material is dropped upon performing a solution process. 
     In this case, the (2-3) opening OA 2 - 3  may be configured to have a relatively narrow width in the region, corresponding to the concave part  163 , compared to other regions. However, the (2-3) opening OA 2 - 3  basically has been configured to have a greater width than the (2-1) opening OA 2 - 1 . Accordingly, in the region in which the concave part  163  has been formed, the second opening OA 2  exposing the (1-3) electrode  160 - 3  can satisfy a minimum width which may be set by taking into consideration the amount of dropping of an organic light-emitting material and a process margin. In this case, a part of the (2-3) opening OA 2 - 3  corresponding to the concave part  163  may be assigned as a region DP to which an organic light-emitting material upon performing a solution process. Furthermore, the (2-3) opening OA 2 - 3  has a sufficient width in the region in which the concave part  163  has not been formed. Accordingly, the region in which the concave part  163  has not been formed may also be allocated as the region to which an organic light-emitting material is dropped. 
     A part of the first electrode  160  exposed by a combination structure of the first bank  172  and the second bank  176  may be defined as an emission region. The plane shape of the emission region may correspond to that of the first electrode  160 . An emission region allocated to each of the first subpixels arranged in the (3n-2) column, an emission region allocated to each of the second subpixels arranged in the (3n-1) column, and an emission region allocated to each of the third subpixels arranged in the (3n-2) column have different areas and shapes. 
     The second bank  176  may have a hydrophobic property. Alternatively, the top of the second bank  176  may have a hydrophobic property, and the lateral part thereof may have a hydrophilic property. For example, the second bank  176  may have a form in which a material of a hydrophobic property has been coated on an insulating material, and may be formed using the insulating material containing a hydrophobic material. The second bank may be made of an organic material. The hydrophobic property of the second bank  176  may function to push an organic light-emitting material configuring the organic emission layer  175  so that the organic light-emitting material gathers at the central part of the emission region. Furthermore, the second bank  176  may function as a barrier to confine an organic light-emitting material, dropped to a corresponding region, in order to prevent organic light-emitting materials of different colors from being mixed. That is, the second bank  176  functions to prevent organic light-emitting materials of different colors dropped to the second openings OA 2  adjacent in the row direction, respectively, from being mixed. 
     The organic emission layer  175  is positioned on the substrate  100  in which the second bank  176  has been formed. The organic emission layer  175  may be formed in the direction in which a corresponding second opening OA 2  has been extended within the second opening OA 2 . That is, an organic light-emitting material dropped to one second opening OA 2  covers the first electrodes  160  and the first banks  172  exposed by the second opening OA 2 . After a curing process, the organic emission layer  175  formed within the second opening OA 2  is not physically separated by the first bank  172  ad maintains continuity on the first bank  172 . 
     Organic light-emitting materials having the same color are dropped to a plurality of first electrodes  160  exposed by one second opening OA 2 . This means that light of the same color is emitted from a plurality of subpixels SP allocated to positions corresponding to the one second opening OA 2 . The plane shape of the organic emission layer  175  may correspond to that of the second opening OA 2 . 
     Organic light-emitting materials having different colors may be sequentially dropped to respective second openings OA 2  alternately. The organic light-emitting materials of different colors may include organic light-emitting materials emitting light of red (R), green (G), and blue (B). The organic emission layers  175  emitting light of different colors are physically separated by the second bank  176 . 
     According to an aspect of the present disclosure, a thickness irregularity phenomenon attributable to a pile-up phenomenon after curing can be improved because an organic light-emitting material can be spread in a uniform thickness in a wide region on the second opening OA 2  extended in the column direction. Accordingly, the organic light-emitting display according to an aspect of the present disclosure can prevent a reduction in the uniformity of the organic emission layer  175  because it can reduce display quality degradation attributable to a thickness deviation within a subpixel SP. Furthermore, the organic light-emitting display can prevent a failure, such as a reduction in the lifespan of a device or the occurrence of a dark point, because the uniformity of the organic emission layer  175  is secured. 
     Furthermore, as described above, the organic light-emitting display according to an aspect of the present disclosure has an advantage in that it can significantly improve display quality degradation attributable to a color mixture failure because the dropping region of an organic light-emitting material can be sufficiently secured. 
       FIG.  9    is a diagram for illustrating an effect of the present disclosure. 
       FIG.  9 ( a )  shows a subpixel structure according to a comparison example, and  FIG.  9 ( b )  shows a subpixel structure according to an aspect of the present disclosure. Numerical values shown in the drawings have been illustrated to help easy understanding of a change in the width, but the present disclosure is not limited thereto. 
     If the organic emission layer is formed using a solution process, a color mixture failure in which organic light-emitting materials  175 - 1  of different colors are mixed because the organic light-emitting materials  175 - 1  are not dropped in place may occur. In order to prevent the color mixture failure, it is necessary to secure a sufficient dropping region of the organic light-emitting material  175 - 1  by taking a process margin into consideration. That is, the width of the second opening OA 2  to which the organic light-emitting material  175 - 1  is dropped in the row direction needs to satisfy a preset width. Furthermore, an area ratio between subpixels needs to be previously set by taking into consideration a light-emitting device characteristic and white balance. 
     In a high-resolution display device having a high pixel per inch (PPI), however, it is difficult to secure a sufficient dropping region because the size per pixel is significantly small. Particularly, in the case of a subpixel having a narrow area, the area of an opening allocated to the subpixel is narrow. In this case, it is difficult for the width of the opening in the row direction to satisfy a minimum width (hereinafter referred to as a “preset width”) which may be configured by taking into consideration the amount of dropping of the organic light-emitting material  175 - 1  and a process margin. 
     Referring to  FIG.  9 ( a ) , in the case of a first subpixel that belongs to subpixels according to a comparison example and that has a small area, it may be difficult for the width of a (2-1) opening OA 2 - 1  in the row direction, allocated to the corresponding subpixel, to satisfy a preset width. In this case, a color mixture failure may occur between adjacent subpixels. 
     In contrast, referring to  FIG.  9 ( b ) , according to an aspect of the present disclosure, a (2-1) opening OA 2 - 1  allocated to a first subpixel having a narrow area may include a part having a wide width in accordance with the area of the convex part  161  of a (1-1) electrode  160 - 1 . Accordingly, the (2-1) opening OA 2 - 1  can satisfy a preset width in the region in which the convex part  161  has been formed. In this case, in order to satisfy a preset area ratio, a total width of the (2-1) opening OA 2 - 1  allocated to the first subpixel is reduced to the extent corresponding to the area of the convex part  161 . 
     A (2-3) opening OA 2 - 3  allocated to a third subpixel having a relatively wide area may include a part having a narrow width in accordance with the area of the concave part  163  of a (1-3) electrode  160 - 3 . In order to satisfy a preset area ratio, however, a total width of the (2-3) opening OA 2 - 3  allocated to the third subpixel is increased to the extent corresponding to the area of the concave part  163 . Accordingly, the (2-3) opening OA 2 - 3  can satisfy a preset width in the region in which the concave part  163  has been formed and/or other regions. 
     As described above, an aspect of the present disclosure can sufficiently secure the area of a dropping region to which the organic light-emitting material  175 - 1  is dropped while maintaining a preset area ratio between subpixels. Accordingly, an aspect of the present disclosure has advantages in that it can prevent a color mixture failure while maintaining a light-emitting device characteristic and white balance. 
       FIGS.  10 A to  13 B  are diagrams for illustrating a process of forming first electrodes, a bank, and an organic emission layer in a time series.  FIGS.  10 A,  11 B,  12 A, and  13 A  are plan views, and  FIGS.  10 B,  11 B,  12 B, and  13 B  are cross-sectional views taken along lines V-V′, VI-VI′ and VII-VII′ of  FIGS.  10 A,  11 B,  12 A, and  13 A , respectively. 
     Referring to  FIGS.  10 A and  10 B , the first electrode  160  is formed on the substrate  100 . One first electrode  160  may be allocated to one subpixel. The (1-1) electrodes  160 - 1  may be positioned in the (3n-2) column, the (1-2) electrodes  160 - 2  may be positioned in the (3n-1) column, and the (1-3) electrodes  160 - 3  may be positioned in the 3n column. The first electrodes  160  include the (1-1) electrode  160 - 1 , the (1-2) electrode  160 - 2 , and the (1-3) electrode  160 - 3 . The (1-1) electrode  160 - 1 , the (1-2) electrode  160 - 2 , and the (1-3) electrode  160 - 3  have different plane shapes. 
     Referring to  FIGS.  11 A and  11 B , the first bank  172  is formed on the substrate  100  in which the first electrode  160  has been formed. The first bank  172  include the first opening OA 1 . The first opening OA 1  exposes a plurality of first electrodes  160  corresponding to one pixel. For example, one first opening OA 1  may expose the (1-1) electrodes  160 - 1 , the (1-2) electrodes  160 - 2 , the (1-3) electrodes  160 - 3 , arranged in one row, together. 
     Referring to  FIGS.  12 A and  12 B , the second bank  176  is formed on the substrate  100  in which the first bank  172  has been formed. The second bank  176  includes the second opening OA 2 . The second opening OA 2  exposes a plurality of first electrodes  160  arranged in the column direction, together. 
     For example, (1-1) electrodes  160 - 1  arranged in the (3n-2) column may be exposed at the same time through one second opening OA 2 . (1-2) electrodes  160 - 2  arranged in the (3n-2) column may be exposed at the same time through one second opening OA 2 . (1-3) electrodes  160 - 3  arranged in the (3n-2) column may be exposed at the same time through one second opening OA 2 . An emission region may be defined by a combination structure of the first bank and the second bank  176 . 
     Referring to  FIGS.  13 A and  13 B , the organic emission layer  175  and the second electrode  180  are sequentially formed on the substrate  100  in which the second bank  176  has been formed. The organic emission layer  175  may include the first organic emission layer  175 - 1  emitting light of the first color, the second organic emission layer  175 - 2  emitting light of the second color, and the third organic emission layer  175 - 3  emitting light of the third color. 
     For example, the first organic emission layer  175 - 1  may be formed on the second opening OA 2  exposing the (1-1) electrodes  160 - 1  arranged in the (3n-2) column. The second organic emission layer  175 - 2  may be formed on the second opening OA 2  exposing the (1-2) electrodes  160 - 2  arranged in the (3n-1) column. The third organic emission layer  175 - 3  may be formed on the second opening OA 2  exposing the (1-3) electrodes  160 - 3  arranged in the (3n-2) column. 
       FIG.  14    is a diagram for illustrating another example of the shape of a first electrode and a second bank. 
     Referring to  FIG.  14 A , the convex part  161  of the (1-1) electrode  160 - 1  may have a shape having a rounded corner. The concave part  163  of the (1-3) electrode  160 - 3  may have a shape having a rounded corner in accordance with the rounded corner of the convex part  161 . The second bank  176  positioned between the (1-1) electrode  160 - 1  and the (1-3) electrode  160 - 3  adjacent each other may be extended in the column direction a round form along the shapes of the convex part  161  and the concave part  163 , in the region in which the convex part  161  and the concave part  163  are disposed. 
     As described above, the top of the second bank  176  may have a hydrophobic property, and the lateral part thereof may have a hydrophilic property. In this case, if the second bank  176  has a round shape, a contact area between the lateral part of the second bank  176  and an organic light-emitting material increases. Accordingly, a dropped organic light-emitting material can be effectively spread because it comes into contact with the lateral part of the second bank  176  having a hydrophilic property. Accordingly, the thickness uniformity of the organic emission layer formed after curing may be improved significantly. 
     Referring to  FIG.  14 B , the convex part  161  of the (1-1) electrode  160 - 1  may have a polygon shape, such as a triangle or a quadrangle. Accordingly, the concave part  163  of the (1-3) electrode  160 - 3  may also have a polygon shape, such as a triangle or a quadrangle, in accordance with the polygon shape of the convex part  161 . The second bank  176  positioned between the (1-1) electrode  160 - 1  and the (1-3) electrode  160 - 3  adjacent each other may be extended in the column direction along the shape of the convex part  161  and the concave part  163 , in the region in which the convex part  161  and the concave part  163  are disposed. As described above, an aspect of the present disclosure has an advantage in that it can have a degree of freedom of design because the shape of the convex part  161  and the concave part  163  are freely changed. For example, the shape of the convex part  161  and the concave part  163  may be selected by taking into consideration the viscosity of an organic light-emitting material and content of solids. 
       FIG.  15    is a plan view schematically showing a display device according to an aspect of the present disclosure.  FIG.  16    shows cross-sectional views taken along lines VIII-VIII′, IX-IX′, and X-X′ of  FIG.  15   . 
     Referring to  FIGS.  15  and  16   , the display device according to the aspect of the present disclosure includes a substrate  100  in which subpixels SP have been arranged. A circuit element layer  101  and an OLED  60  driven by the elements of the circuit element layer  101  are disposed on the substrate  100 . 
     A signal line for applying a driving signal to the OLED  60  and electrodes may be arranged in the circuit element layer  101 . The signal line and the electrodes may be disposed with at least one insulating layer interposed therebetween, if necessary. If the organic light-emitting display is implemented using an active matrix (AM) method, the circuit element layer  101  may further include a transistor allocated to each subpixel SP. In this case, the subpixel SP may have a structure, such as that shown in  FIG.  5   , but is not limited thereto. 
     The OLED  60  includes a first electrode  160 , a second electrode  180 , and an organic emission layer  175  interposed between the first electrode  160  and the second electrode  180 . The first electrode  160  may be an anode, and the second electrode  180  may be a cathode. 
     More specifically, the subpixels SP may be arranged in a row direction (e.g., X-axis direction) and a column direction (e.g., Y-axis direction) which cross each other. Subpixels SP adjacently arranged in the row direction may emit light of different colors, and subpixels SP adjacently arranged in the column direction may emit light of the same color. 
     The subpixels include a first subpixel in a (3n-2) (n is a natural number of 1 or more) column, a second subpixel arranged in a (3n-1) column, and a third subpixel arranged in a 3n column. That is, the first subpixel, second subpixel and third subpixel are sequentially arranged alternately in the row direction. The first subpixel may emit light of a first color. The second subpixel may emit light of a second color. The third subpixel may emit light of a third color. The first color may be red, the second color may be green, and the third color may be blue, but are not limited thereto. 
     The first electrode  160  of the OLED  60  is positioned in the subpixel SP. One first electrode  160  may be allocated to one subpixel SP. Adjacent first electrodes  160  are spaced apart at predetermined intervals. 
     The first electrodes  160  include a (1-1) electrode  160 - 1 , a (1-2) electrode  160 - 2 , and a (1-3) electrode  160 - 3 . The (1-1) electrode  160 - 1 , (1-2) electrode  160 - 2 , and (1-3) electrode  160 - 3  have different plane shapes. The (1-1) electrode  160 - 1  may be allocated to the first subpixel, the (1-2) electrode  160 - 2  may be allocated to the second subpixel, and the (1-3) electrode  160 - 3  may be allocated to the third subpixel. 
     The (1-1) electrodes  160 - 1  are disposed in the (3n-2) column. The (1-1) electrodes  160 - 1  are sequentially disposed in the column direction. The (1-2) electrodes  160 - 2  are disposed in the (3n-1) column. The (1-2) electrodes  160 - 2  are sequentially disposed in the column direction. The (1-3) electrodes  160 - 3  are disposed in the  3   n  column. The (1-3) electrodes  160 - 3  are sequentially disposed in the column direction. Accordingly, the (1-1) electrode  160 - 1 , (1-2) electrode  160 - 2 , and (1-3) electrode  160 - 3  are sequentially disposed alternately in the row direction. 
     The (1-1) electrode  160 - 1  has a convex part  161  on its one side. The convex part  161  may be disposed on one side of the (1-1) electrode  160 - 1  not adjacent to the (1-2) electrode  160 - 2 . The convex part  161  may be positioned on one side of the (1-1) electrode  160 - 1  adjacent to the (1-3) electrode  160 - 3 . The area of the region in which the convex part  161  of the (1-1) electrode  160 - 1  has been formed has a wide area compared to other regions. The convex part  161  may be protruded toward the (1-3) electrode  160 - 3  in a region adjacent to the (1-3) electrode  160 - 3 . 
     The (1-2) electrode  160 - 2  may have a square or an oblong. 
     The (1-3) electrode  160 - 3  has a concave part  163  on its one side. The concave part  163  may be positioned on one side of the (1-3) electrode  160 - 3  not adjacent to the (1-2) electrode  160 - 2 . The concave part  163  may be positioned on one side of the (1-1) electrode  160 - 1  adjacent to the (1-1) electrode  160 - 1 . In the region in which the (1-1) electrode  160 - 1  and the (1-3) electrode  160 - 3  are adjacently disposed, the convex part  161  of the (1-1) electrode  160 - 1  is opposite the concave part  163  of the (1-3) electrode  160 - 3 . In the region in which the (1-1) electrode  160 - 1  and the (1-3) electrode  160 - 3  are adjacently disposed, the convex part  161  of the (1-1) electrode  160 - 1  may be inserted in the concave part  163  of the (1-3) electrode  160 - 3 . 
     A bank  270  is positioned on the substrate  100  in which the first electrode  160  has been formed. The bank  270  may partition subpixels adjacent in the column direction and the row direction. 
     The bank  270  includes an opening OA exposing at least one part of the first electrode  160 . One opening OA may be allocated to one first electrode  160 . A part of the first electrode  160  exposed by the opening OA may be defined as an emission region. The plane shape of the emission region may correspond to that of the first electrode  160 . 
     An opening OA exposing each of the (1-1) electrodes  160 - 1  arranged in the (3n-2) column, an opening OA exposing each of the (1-2) electrodes  160 - 2  arranged in the (3n-1) column, and an opening OA exposing each of the (1-3) electrodes  160 - 3  arranged in the 3n column have different areas and shapes. 
     A part that belongs to the opening OA and that exposes the convex parts  161  of the (1-1) electrodes  160 - 1  may be configured to have a relatively wide width compared to a part exposing other parts of the (1-1) electrodes  160 - 1 . Accordingly, a part of the opening OA exposing the convex part  161  can satisfy a minimum width which may be set by taking into consideration the amount of dropping of an organic light-emitting material and a process margin. In this case, the part of the opening OA exposing the convex part  161  may be assigned as a dropping region DP to which an organic light-emitting material is dropped upon performing a solution process. 
     In this case, an opening OA that belongs to the opening OA and that exposes the (1-3) electrode  160 - 3  may be configured to have a relatively narrow width in a region, corresponding to the concave part  163 , compared to other regions. However, an opening OA exposing the (1-3) electrode  160 - 3  has been configured to have a large width compared to the opening OA exposing the (1-1) electrode  160 - 1 . Accordingly, in other regions in addition to the region in which the concave part  163  has been formed, the opening OA exposing the (1-3) electrode  160 - 3  can satisfy a minimum width which may be set by taking into consideration the amount of dropping of an organic light-emitting material and a process margin. In this case, the opening OA exposing the (1-3) electrode  160 - 3  may be assigned as a region DP to which an organic light-emitting material is dropped upon performing a solution process. 
     As described above, the organic light-emitting display according to the first modification example of the present disclosure has an advantage in that it can significantly improve display quality degradation attributable to a color mixture failure because the dropping area of an organic light-emitting material can be sufficiently secured. 
     An organic emission layer  175  is positioned on the substrate  100  in which the bank  270  has been formed. The organic emission layer  175  may be formed within a corresponding opening OA. The organic emission layers  175  formed within openings OA adjacent in the column direction and the row direction may be physically separated by the bank  270 . 
       FIG.  17    is a plan view schematically showing a display device according to another aspect of the present disclosure.  FIG.  18    shows cross-sectional views taken along lines A-A′, B-B′ and C-C′ of  FIG.  17   . 
     Referring to  FIGS.  17  and  18   , the display device according to the second modification example of the present disclosure includes a substrate  100  in which subpixels SP have been arranged. A circuit element layer  101  and an OLED  60  driven by the elements of the circuit element layer  101  are disposed on the substrate  100 . 
     A signal line for applying a driving signal to the OLED  60  and electrodes may be arranged in the circuit element layer  101 . The signal line and the electrodes may be disposed with at least one insulating layer interposed therebetween, if necessary. If the organic light-emitting display is implemented using an active matrix (AM) method, the circuit element layer  101  may further include a transistor allocated to each subpixel SP. In this case, the subpixel SP may have a structure, such as that shown in  FIG.  5   , but is not limited thereto. 
     The OLED  60  includes a first electrode  160 , a second electrode  180 , and an organic emission layer  175  interposed between the first electrode  160  and the second electrode  180 . The first electrode  160  may be an anode, and the second electrode  180  may be a cathode. 
     More specifically, the subpixels SP may be arranged in a row direction (e.g., X-axis direction) and a column direction (e.g., Y-axis direction) which cross each other. Subpixels SP adjacently arranged in the row direction may emit light of different colors, and subpixels SP adjacently arranged in the column direction may emit light of the same color. 
     The subpixels include a first subpixel in a (3n-2) (n is a natural number of 1 or more) column, a second subpixel arranged in a (3n-1) column, and a third subpixel arranged in a 3n column. That is, the first subpixel, second subpixel and third subpixel are sequentially arranged alternately in the row direction. The first subpixel may emit light of a first color. The second subpixel may emit light of a second color. The third subpixel may emit light of a third color. The first color may be red, the second color may be green, and the third color may be blue, but are not limited thereto. 
     The first electrode  160  of the OLED  60  is positioned in the subpixel SP. One first electrode  160  may be allocated to one subpixel SP. Adjacent first electrodes  160  are spaced apart at predetermined intervals. 
     The first electrodes  160  include a (1-1) electrode  160 - 1 , a (1-2) electrode  160 - 2 , and a (1-3) electrode  160 - 3 . The (1-1) electrode  160 - 1 , (1-2) electrode  160 - 2 , and (1-3) electrode  160 - 3  have different plane shapes. The (1-1) electrode  160 - 1  may be allocated to the first subpixel, the (1-2) electrode  160 - 2  may be allocated to the second subpixel, and the (1-3) electrode  160 - 3  may be allocated to the third subpixel. 
     The (1-1) electrodes  160 - 1  are disposed in the (3n-2) column. The (1-1) electrodes  160 - 1  are sequentially disposed in the column direction. The (1-2) electrodes  160 - 2  are disposed in the (3n-1) column. The (1-2) electrodes  160 - 2  are sequentially disposed in the column direction. The (1-3) electrodes  160 - 3  are disposed in the 3n column. The (1-3) electrodes  160 - 3  are sequentially disposed in the column direction. Accordingly, the (1-1) electrode  160 - 1 , (1-2) electrode  160 - 2 , and (1-3) electrode  160 - 3  are sequentially disposed alternately in the row direction. 
     The (1-1) electrode  160 - 1  has a convex part  161  on its one side. The convex part  161  may be disposed on one side of the (1-1) electrode  160 - 1  not adjacent to the (1-2) electrode  160 - 2 . The convex part  161  may be positioned on one side of the (1-1) electrode  160 - 1  adjacent to the (1-3) electrode  160 - 3 . The area of the region in which the convex part  161  of the (1-1) electrode  160 - 1  has been formed has a wide area compared to other regions. The convex part  161  may be protruded toward the (1-3) electrode  160 - 3  in a region adjacent to the (1-3) electrode  160 - 3 . 
     The (1-2) electrode  160 - 2  may have a square or an oblong. 
     The (1-3) electrode  160 - 3  has a concave part  163  on its one side. The concave part  163  may be positioned on one side of the (1-3) electrode  160 - 3  not adjacent to the (1-2) electrode  160 - 2 . The concave part  163  may be positioned on one side of the (1-1) electrode  160 - 1  adjacent to the (1-1) electrode  160 - 1 . In the region in which the (1-1) electrode  160 - 1  and the (1-3) electrode  160 - 3  are adjacently disposed, the convex part  161  of the (1-1) electrode  160 - 1  is opposite the concave part  163  of the (1-3) electrode  160 - 3 . In the region in which the (1-1) electrode  160 - 1  and the (1-3) electrode  160 - 3  are adjacently disposed, the convex part  161  of the (1-1) electrode  160 - 1  may be inserted in the concave part  163  of the (1-3) electrode  160 - 3 . 
     A bank  370  is positioned on the substrate  100  in which the first electrode  160  has been formed. The bank  370  includes a first bank  372  and a second bank  376 . 
     The first bank  372  includes a first opening OA 1  exposing at least one part of the first electrode  160 . One first opening OA 1  may be allocated to one first electrode  160 . The first bank  372  may be formed to cover the edge of the first electrode  160 , thus exposing most of the central part of the first electrode  160 . In this case, the boundary of the first opening OA 1  may be positioned inside the boundary of the first electrode  160 . The boundary of the first opening OA 1  determines the plane shape of the first opening OA 1 . The boundary of the first electrode  160  determines the plane shape of the first electrode  160 . A part of the first electrode  160  exposed by the first opening OA 1  may be defined as an emission region. 
     A first opening OA 1  exposing the (1-1) electrodes  160 - 1  arranged in the (3n-2) column, a first opening OA 1  exposing the (1-2) electrodes  160 - 2  arranged in the (3n-1) column, and a first opening OA 1  exposing the (1-3) electrodes  160 - 3  arranged in the  3   n  column have different areas and shapes. 
     The second bank  376  includes a second opening OA 2  exposing at least one part of the first electrode  160 . One second opening OA 2  may be allocated to one first electrode  160 . 
     The second opening OA 2  may be formed to have a wider area than the first opening OA 1 , thus accommodating the first opening OA 1 . That is, the boundary of the second opening OA 2  may be spaced apart toward the outside of the boundary of the first opening OA 1  at a preset interval. The boundary of the second opening  61  determines the plane shape of the second opening  61 . 
     A second opening OA 2  exposing each of the (1-1) electrodes  160 - 1  arranged in the (3n-2) column, a second opening OA 2  exposing each of the (1-2) electrodes  160 - 2  arranged in the (3n-1) column, and a second opening OA 2  exposing each of the (1-3) electrodes  160 - 3  arranged in the 3n column have different areas and shapes. 
     The plane shapes of the first electrode  160 , first opening OA 1 , and second opening OA 2  allocated to one subpixel may correspond to each other. 
     A part that belongs to the second opening OA and that exposes the convex parts  161  of the (1-1) electrodes  160 - 1  may be configured to have a relatively wide width compared to a part exposing other parts of the (1-1) electrodes  160 - 1 . Accordingly, a part that belongs to the second opening OA 2  and that exposes the convex part  161  can satisfy a minimum width which may be set by taking into consideration the amount of dropping of an organic light-emitting material and a process margin. In this case, the part of the second opening OA 2  exposing the convex part  161  may be assigned as a dropping region DP to which an organic light-emitting material is dropped upon performing a solution process. 
     In this case, a second opening OA 2  that belongs to the second opening OA and that exposes the (1-3) electrode  160 - 3  may be configured to have a relatively narrow width in a region, corresponding to the concave part  163 , compared to other parts. However, the second opening OA 2  exposing the (1-3) electrode  160 - 3  has been configured to have a large width compared to the second opening OA 2  exposing the (1-1) electrode  160 - 1 . Accordingly, in other regions in addition to the region in which the concave part  163  has been formed, the second opening OA 2  exposing the (1-3) electrode  160 - 3  can satisfy a minimum width which may be set by taking into consideration the amount of dropping of an organic light-emitting material and a process margin. In this case, the second opening OA 2  exposing the (1-3) electrode  160 - 3  may be assigned as a region DP to which an organic light-emitting material is dropped upon performing a solution process. 
     As described above, the organic light-emitting display according to the second modification example of the present disclosure has an advantage in that it can significantly improve display quality degradation attributable to a color mixture failure because the dropping area of an organic light-emitting material can be sufficiently secured. 
     An organic emission layer  175  is positioned on the substrate  100  in which the bank  370  has been formed. The organic emission layer  175  may be formed within a corresponding opening OA. The organic emission layers  175  formed within openings OA adjacent in the column direction and the row direction may be physically separated by the bank  370 . 
     The first bank  372  is a thin film of a hydrophilic component provided to prevent a wettability failure attributable to the hydrophobic property of the first electrode  160 , and functions to well spread an organic light-emitting material having a hydrophilic property. The second bank  376  is a thick of a hydrophobic component, and functions to push an organic light-emitting material of a hydrophilic property toward a central part. The organic emission layer  175  may be formed to have a uniform thickness on the emission region through a combination structure of the first bank  172  and the second bank  176 . 
     Those skilled in the art may change and modify the present disclosure in various ways without departing from the technical spirit of the present disclosure through the above description. Accordingly, the technical range of the present disclosure should not be limited to the detailed contents of the specification, but should be determined by the claims. 
     An organic light-emitting display comprises a substrate having a plurality of subpixels arranged in a row direction and a column direction crossing the row direction; first electrodes allocated to the subpixels, respectively, and comprising (1-1) electrodes arranged in a (3n-2) (n is a natural number of 1 or more) column, (1-2) electrodes arranged in a (3n-1) column, and a (1-3) electrode arranged in a 3n column; and a bank having an opening exposing the first electrodes, wherein the (1-1) electrode comprises a convex part protruded toward the (1-3) electrode, and wherein the (1-3) electrode comprises a concave part opposing the convex part. 
     The convex part of the (1-1) electrode is inserted in the concave part of the (1-3) electrode. 
     The subpixels comprise a first subpixel having the (1-1) electrode, a second subpixel having the (1-2) electrode, and a third subpixel having the (1-3) electrode, and areas and shapes of the openings allocated to the first subpixel, the second subpixel, and the third subpixels, respectively, are different. 
     The bank comprises: a first bank having first openings, the first opening exposing one first electrode; and a second bank positioned above the first bank and having second openings, the second opening exposing a plurality of the first electrodes. 
     Plane shapes of the first electrode and the second opening allocated to one subpixel correspond to each other. 
     The subpixels comprise a first subpixel having the (1-1) electrode, a second subpixel having the (1-2) electrode, and a third subpixel having the (1-3) electrode, and areas and shapes of the second openings allocated to the first subpixel, the second subpixel, and the third subpixel, respectively, are different. 
     The bank comprises: a first bank positioned between the first electrodes adjacent in the column direction; and a second bank positioned between the first electrodes adjacent in the row direction. 
     At least one part of the first electrode exposed by a combination structure of the first bank and the second bank is defined as an emission region, and a plane shape of the emission region corresponds to a plane shape of the first electrode. 
     The subpixels comprise a first subpixel having the (1-1) electrode, a second subpixel having the (1-2) electrode, and a third subpixel having the (1-3) electrode, and areas and shapes of the emission regions allocated to the first subpixel, the second subpixel, and the third subpixel, respectively, are different. 
     The second bank is extended in the column direction in a straight-line form between the (1-1) electrodes arranged in the (3n-2) column and the (1-2) electrodes arranged in the (3n-1) column, the second bank is extended in the column direction in a straight-line form between the (1-2) electrodes arranged in the (3n-1) column and the (1-3) electrodes arranged in the 3n column, and the second bank is extended in the column direction in a zigzag form between the (1-3) electrodes arranged in the 3n column and the (1-2) electrodes arranged in the (3n-2) column. 
     The second bank comprises: (2-1) openings exposing the (1-1) electrodes, arranged in the (3n-2) column, together; (2-2) openings exposing the (1-2) electrodes, arranged in the (3n-1) column, together; and (2-3) openings exposing the (1-3) electrodes, arranged in the 3n column, together, and wherein areas and shapes of the (2-1) opening, the (2-2) opening, and the (2-3) opening are different. 
     The convex part has a shape having a rounded corner, and the concave part has a shape having a rounded corner in accordance with the shape of the convex part. 
     The first bank has a hydrophilic property, and the second bank has a hydrophobic property.