Patent Publication Number: US-11647649-B2

Title: Organic light emitting display device with openings in banks in a dummy area

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit under 35 U.S.C. § 119(a) of Republic of Korea Patent Application No. 10-2019-0165044, filed on Dec. 11, 2019, in the Korean Intellectual Property Office, which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to an organic light emitting display device. 
     2. Discussion of the Related Art 
     Recently, various display devices having reduced weights and volumes, which are disadvantages of a cathode ray tube, have been developed. Such display devices include a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), an organic light emitting display device, and the like. 
     An organic light emitting display device is a self-emission device that spontaneously emits light and has advantages of a high response time, high emission efficiency, high luminance, and a wide viewing angle. In addition, flexible display devices may be realized because elements may be formed on a flexible substrate such as a plastic substrate. 
     Recently, as an organic light emitting display device having a large area and high resolution is required, a plurality of sub-pixels are included in a single panel. A mask is generally used for patterning of red (R), green (G) and blue (B) sub-pixels. Accordingly, in order to realize a large-area display device, a large-area fine metal mask (FMM) corresponding thereto is required. However, a mask may sag as the area thereof increases, causing the occurrence of various defects such as non-deposition of an organic light emitting material which forms a light emitting layer at a desired position. 
     In order to solve the above-described problem of a deposition method using a mask, a solution process which is simple and is advantageous for a large area is attracting interest. The solution process can perform large-area patterning through inkjet printing or nozzle printing without a mask and has a very high material use rate of 50% to 80% compared to vacuum evaporation having a material use rate of below 10%. In addition, the solution process provides a glass transition temperature higher than that of a vacuum evaporated thin film and thus achieves high thermal stability and an excellent morphology characteristic. 
     SUMMARY 
     However, when a light emitting layer is formed through the solution process, a thickness deviation according to positions in sub-pixels may cause thickness non-uniformity, and thus there is a problem that the display quality is considerably deteriorated. 
     Accordingly, the present disclosure is directed to providing an organic light emitting display device having a double bank structure. 
     According to an aspect of the present disclosure, there is provided an organic light emitting display device including a substrate including a display area and a non-display area at a periphery of the display area, the display area including a plurality of sub-pixels; an overcoat layer disposed on the substrate; first electrodes disposed on the overcoat layer and in the sub-pixels; a first bank disposed in the display area and the non-display area and including first openings, the first openings respectively exposing the first electrodes; a second bank disposed on the first bank and including second openings in the display area, third openings in the non-display area and fourth openings, the second openings exposing the plurality of first electrodes arranged in the display area, the third openings exposing the first openings arranged in the non-display area, and the fourth openings connecting the second openings and the third openings; and an organic light emitting layer disposed in each of the second openings, the third openings and the fourth openings. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the inventive concepts as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the disclosure, are incorporated in and constitute a part of this specification, illustrate implementations of the disclosure and together with the description serve to explain the principles of embodiments of the disclosure. 
         FIG.  1    is a schematic block diagram of an organic light emitting display device according to one embodiment. 
         FIGS.  2  and  3    are configuration diagrams schematically illustrating a sub-pixel shown in  FIG.  1    according to one embodiment. 
         FIG.  4    is an enlarged plan view of an area AR of  FIG.  1    schematically illustrating an organic light emitting display device according to a first embodiment of the present disclosure. 
         FIGS.  5 A and  5 B  cross-sectional views taken along lines I-I′ and II-II′ of  FIG.  4   , respectively according to the first embodiment of the present disclosure. 
         FIG.  6    is a cross-sectional view taken along line of  FIG.  4    according to the first embodiment of the present disclosure. 
         FIGS.  7 A to  7 C  are views for describing a dewetting phenomenon at an edge portion according to one embodiment of the present disclosure. 
         FIG.  8    is an enlarged plan view schematically of an area AR of  FIG.  1    illustrating an organic light emitting display device according to a second embodiment of the present disclosure. 
         FIGS.  9 A to  9 C  are cross-sectional views taken along line IV-IV′, V-V′, and VI-VI′ of  FIG.  8   , respectively according to the second embodiment of the present disclosure. 
         FIG.  10    is a plan view illustrating second openings, third openings, and fourth openings of the organic light emitting display device according to the second embodiment of the present disclosure. 
         FIG.  11    is an enlarged plan view of the area AR of  FIG.  1    schematically illustrating an organic light emitting display device according to a third embodiment of the present disclosure. 
         FIG.  12    is a plan view illustrating second openings, third openings, and fourth openings of the organic light emitting display device according to the third embodiment of the present disclosure. 
         FIG.  13    is an enlarged plan view of the area AR of  FIG.  1    schematically illustrating an organic light emitting display device according to a fourth embodiment of the present disclosure. 
         FIG.  14    is a plan view illustrating second openings, third openings, and fourth openings of the organic light emitting display device according to the fourth embodiment of the present disclosure. 
         FIG.  15    is an enlarged plan view of the area AR of  FIG.  1    schematically illustrating an organic light emitting display device according to a fifth embodiment of the present disclosure. 
         FIG.  16    is a plan view illustrating second openings, third openings, and fourth openings of the organic light emitting display device according to the fifth embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, exemplary embodiments of the present disclosure will be 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 embodiments, the same element is representatively described at the introductory part of this specification, and may be omitted in other embodiments. 
     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 another element. 
       FIG.  1    is a schematic block diagram of an organic light emitting display device.  FIGS.  2  and  3    are configuration diagrams schematically illustrating a sub-pixel shown in  FIG.  1   . 
     Referring to  FIG.  1   , the organic light emitting display device includes an image processor  11 , a timing controller  12 , a data driver  13 , a gate driver  14 , and a display panel  15 . 
     The image processor  11  outputs a data enable signal DE along with a data signal DATA supplied from the outside. 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 such signals are not shown for convenience of description. The image processor  11  is formed on a system circuit board in an integrated circuit (IC) form. 
     The timing controller  12  is supplied with a data enable signal DE or driving signals, including a vertical sync signal, a horizontal sync signal, and a clock signal, along with the data signal DATA from the image processor  11 . 
     The timing controller  12  outputs a gate timing control signal GDC for controlling the operational timing of the gate driver  14  and a data timing control signal DDC for controlling the operational timing of the data driver  13 , based on the driving signals. The timing controller  12  is formed on a control circuit board in an IC form. 
     The data driver  13  converts the data signal DATA, supplied from the timing controller  12 , into a gamma reference voltage by sampling and latching the data signal DATA in response to the data timing control signal DDC supplied from the timing controller  12 , and outputs the gamma reference voltage. The data driver  13  outputs the data signal DATA through data lines DL 1  to DLn. The data driver  13  may be formed on a data circuit board in an IC form and attached to the display panel  15 . 
     The gate driver  14  outputs a gate signal while shifting a level of a gate voltage in response to the gate timing control signal GDC supplied from the timing controller  12 . The gate driver  14  outputs the gate signal through gate lines GL 1  to GLm. The gate driver  14  may be formed on a gate circuit board in an IC form and attached to the display panel  15  or may be formed on the display panel  15  in a gate-in-panel manner. 
     The display panel  15  includes a display area AA in which an image is realized and a non-display area NA other than the display area AA. The display area AA includes sub-pixels SP. The sub-pixels may be defined by the intersection structure of signal lines. 
     The display panel  15  displays an image in accordance with the data signal DATA and the gate signal respectively supplied from the data driver  13  and the gate driver  14 . The non-display area NA includes pads to which a circuit board is bonded and which receive a signal from the circuit board and link lines connected to the pads to transfer the signal to the sub-pixels SP of the display area AA. 
     Referring to  FIG.  2   , one sub-pixel includes a switching transistor SW, a driving transistor DR, a compensation circuit CC, and an organic light emitting diode (OLED). The OLED operates to emit light in response to a driving current formed by the driving transistor DR. 
     The switching transistor SW performs a switching operation in response to a gate signal supplied through a first gate line GL 1  so that a data signal supplied through a first data line DL 1  is stored in a capacitor as a data voltage. The driving transistor DR operates in response to a data voltage stored in the capacitor so that a driving current flows between a high potential power source line VDD and a low potential power source line GND. The compensation circuit CC is a circuit for compensating a threshold voltage or the like of the driving transistor DR. Further, the capacitor connected to the switching transistor SW or the driving transistor DR may be positioned within the compensation circuit CC. 
     The compensation circuit CC comprises of one or more thin-film transistors and a capacitor. The configuration of the compensation circuit CC is very diverse depending on a compensation method, and a detailed example and description thereof are omitted. 
     Further, as shown in  FIG.  3   , when the compensation circuit CC is included, the sub-pixel further includes a signal line, a power source line, and the like for supplying a specific signal or power source, in addition to driving a compensation thin-film transistor. The switching transistor SW performs a switching operation in response to a gate signal supplied through a first gate line GL 1   a  similar to  FIG.  2   . The added signal line may be defined as a first-second gate line GL 1   b  for driving the compensation thin-film transistor included in the sub-pixel. In addition, the added power source line may be defined as an initialization power source line INIT for initializing a specific node of the sub-pixel with a specific voltage. However, this is only one example and the present disclosure is not limited thereto. 
       FIGS.  2  and  3    illustrate an example in which one sub-pixel includes the compensation circuit CC. However, when the subject of compensation is positioned outside the sub-pixel such as the data driver  13 , the compensation circuit CC may be omitted. That is, one sub-pixel has a two transistor-one capacitor (2T1C) structure basically including a switching transistor SW, a driving transistor DR, a capacitor, and an OLED, but may be configured in various ways, such as 3T1C, 4T2C, 5T2C, 6T2C, 7T2C when the compensation circuit CC is added. 
     First Embodiment 
       FIG.  4    is an enlarged plan view of an area AR of  FIG.  1    schematically illustrating an organic light emitting display device according to a first embodiment of the present disclosure.  FIGS.  5 A and  5 B  are cross-sectional views taken along lines I-I′ and II-II′ of  FIG.  4   , respectively. 
     Referring to  FIGS.  4  and  5 A to  5 B , an organic light emitting display device  100  according to the first embodiment of the present disclosure includes a substrate  10  having a display area AA in which sub-pixels SP are arranged and a non-display area NA outside the display area AA. The substrate  10  may have various planar shapes. For example, as shown in the drawings, the substrate may include all planar shapes such as a square shape, a circular shape, and an elliptical shape, as well as a rectangular shape. A first direction (e.g., X-axis direction) and a second direction (e.g., Y-axis direction) that intersect each other regardless of the planar shape of the substrate  10  are defined in the substrate  10 . The position and arrangement relation of the sub-pixels and/or the openings may be defined by the first direction and the second direction. 
     A circuit element layer  20  and an OLED driven by elements provided in the circuit element layer  20  are disposed on the substrate  10 . 
     A signal line and electrodes for applying a driving signal to the OLED may be arranged in the circuit element layer  20 , and the signal line and the electrodes may be spaced apart and disposed with at least one insulating layer interposed therebetween as necessary. When the organic light emitting display device is implemented in an active matrix (AM) manner, the circuit element layer  20  may further include a thin-film transistor  21  allocated to each sub-pixel SP. In the following, for convenience of description, a case in which the thin-film transistor  21  is allocated to each sub-pixel will be described as an example. In this case, a passivation film  27  and an overcoat layer  28  are interposed between the thin-film transistor  21  and the OLED. The passivation film  27  includes an inorganic material and protects internal elements. The overcoat layer  28  includes a predetermined organic material and is formed to have a predetermined thickness, and compensates for a step difference due to the thin-film transistor  21  and the signal lines formed there below. 
     The OLED includes a first electrode  30 , a second electrode  60 , and an organic light emitting layer  50  interposed between the first electrode  30  and the second electrode  60 . The first electrode  30  may be an anode, and the second electrode  60  may be a cathode. 
     More specifically, the sub-pixels SP may be arranged in the first direction and the second direction which intersect each other. The sub-pixels SP adjacently arranged in the first direction may emit light of different colors, and the sub-pixels SP adjacently arranged in the second direction may emit light of the same color. The first electrode  30  of the OLED is disposed in the sub-pixels SP. One first electrode  30  may be assigned per sub-pixel SP. 
     A bank  40  is disposed on the first electrode  30 . The bank  40  includes a first bank  41  and a second bank  43 . 
     The first bank  41  is positioned on the first electrode  30 . The first bank  41  includes first openings  42  exposing at least some of the first electrode  30 . One first opening  42  exposes one first electrode  30 . Thus, the number of first openings  42  and the number of first electrodes  30  may correspond to each other. 
     The first bank  41  may be formed to a relatively small thickness so that the first bank is covered by the organic light emitting layer  50 . The first bank  41  may have a hydrophilic property. As an example, the first bank  41  may be made of a hydrophilic inorganic insulating material, such as silicon oxide (SiO 2 ) and silicon nitride (SiN x ). 
     In  FIG.  4   , the first opening  42  is illustrated as having an approximately rectangular shape, but the present disclosure is not limited thereto. Further, all the first openings  42  are illustrated as having the same shape and area, but the present disclosure is not limited thereto. At least any one first opening  42  may have a shape and/or area different from that of another first opening  42 . For example, the shape and/or area of the first opening  42  may be appropriately selected in consideration of the lifespan of an organic light emitting material for forming the organic light emitting layer  50  of the OLED. The portion of the first electrode  30  exposed by the first opening  42  may be defined as an emission area. 
     The second bank  43  is positioned on the substrate  10  on which the first bank  41  is formed. The second bank  43  includes second openings  44  exposing at least some of the first electrode  30 . A plurality of the second openings  44  are arranged side by side in the first direction and extended in the second direction. The second openings  44  are extended in the second direction, and expose a plurality of first electrodes  30  disposed in the second direction. Alternatively, the second openings  44  are extended in the second direction, and expose a plurality of first openings  42  disposed in the second direction. 
     The second bank  43  may have a hydrophobic property. Alternatively, an upper surface and a side surface of the second bank  43  may have a hydrophobic property. As an example, the second bank  43  may have a form in which an insulating material is coated with a hydrophobic material, and may be made of an insulating material containing a hydrophobic material. The second bank  43  may be made of an organic material. The hydrophobic property of the second bank  43  may function to push an organic light emitting material constituting the organic light emitting layer  50  so that the organic light emitting material gathers at a central portion of the emission area. In addition, the second bank  43  may function as a barrier for confining an organic light emitting material dropped on a corresponding area in order to prevent organic light emitting materials of different colors from being mixed. 
     In  FIG.  4   , the second opening  44  is illustrated as having an approximately rectangular shape, but the present disclosure is not limited thereto. Further, all the second openings  44  are illustrated as having the same shape and area, but the present disclosure is not limited thereto. At least any one second opening  44  may have a shape and/or area different from that of another second opening  44 . For example, the shape and/or area of the second opening  44  may be properly selected by taking into consideration the lifespan of an organic light emitting material. 
     The second opening  44  is positioned to be outwardly spaced apart from the first opening  42 . That is, the boundary of the first bank  41  is spaced apart from the boundary of the second bank  43  by a predetermined interval. Thus, the first opening  42  may be exposed by the second opening  44 . 
     The organic light emitting layer  50  is positioned on the substrate  10  on which the second bank  43  is formed. The organic light emitting layer  50  may be formed within the corresponding second opening  44  in the direction in which the second opening  44  is extended. That is, an organic light emitting material dropped into one second opening  44  covers the first electrodes  30  and the first banks  41  exposed by the second opening  44 , and is not physically separated by the first banks  41 . 
     An organic light emitting material of the same color is dropped on the plurality of first electrodes  30  exposed by one second opening  44 . This means that light of the same color is emitted from a plurality of sub-pixels SP allocated to a position corresponding to one second opening  44 . The planar shape of the organic light emitting layer  50  may correspond to the planar shape of the second opening  44 . 
     Organic light emitting materials of different colors may be sequentially and alternately dropped into the corresponding second openings  44 . The organic light emitting materials of different colors may include organic light emitting materials which emit red (R), green (G), and blue (B), and as necessary, may further include an organic light emitting material which emits white (W). 
     The second bank  43  is positioned between the first electrodes  30  adjacent to each other in the first direction and prevents differently colored organic light emitting materials dropped into the second openings  44  adjacent to each other in the first direction from being mixed. That is, differently colored organic light emitting materials dropped into different second openings  44  are physically separated by the second bank  43 . 
     The organic light emitting material used to form the organic light emitting layer  50  in a solution process is dropped to cover at least some of the first electrode  30 , some of the first bank  41 , and some of the second bank  43 . The first bank  41  is a hydrophilic thin film provided to reduce poor wettability of the first electrodes  30  due to a hydrophobic property thereof and allows hydrophilic organic light emitting materials to spread well. The second bank  43  is a hydrophobic thick film and pushes the hydrophilic organic light emitting material to the center. Due to the combined structure of the first bank  41  and the second bank  43 , the organic light emitting layer  50  may be formed with a relatively uniform thickness in the emission area. 
     Further, in a case in which the second openings  44  each expose one first electrode  30 , the thickness of the organic light emitting material dropped into each of the second openings  44  may be different depending on a variance in equipment of the solution process. The variance in the equipment may refer to varying spray rates between nozzles of inkjet equipment. That is, the spray rates of nozzles used to drop organic light emitting material into the second openings  44  may be inconsistent. In this case, the thickness of the organic light emitting material dropped into each of the sub-pixels SP through the nozzles allocated for one sub-pixel SP may vary according to a position. 
     In the organic light emitting display device  100  according to the first embodiment of the present disclosure, a plurality of sub-pixels SP may be allocated within one second opening  44 , and a plurality of nozzles corresponding to the number of sub-pixels SP may be allocated within the one second opening  44 , which compensates for the varying spray rates between the nozzles, so that the organic light emitting materials dropped into the second openings  44  may have a uniform thickness. 
     Accordingly, the organic light emitting display device according to the first embodiment of the present disclosure may reduce deterioration in the uniformity of the organic light emitting layer  50 , thereby reducing deterioration of display quality due to the thickness deviation of the organic light emitting layer  50  in the sub-pixels SP. In addition, deterioration in the element&#39;s lifespan or imperfections like dark spot formations may be prevented or reduced by securing the uniformity of the organic light emitting layer  50 . 
     The above-described predetermined distance between the boundary of the first bank  41  and the boundary of the second bank  43  refers to a minimum distance at which thickness uniformity of the organic light emitting layer  50  is secured. When the distance between the boundary of the first bank  41  and the boundary of the second bank  43  is less than the predetermined distance, the uniformity of the organic light emitting layer  50  may not be secured. When the distance between the boundary of the first bank  41  and the boundary of the second bank  43  is greater than the predetermined distance, the area of the first electrodes  30  which are covered by the first bank  41  increases, which may cause problems such as a small aperture ratio. 
     In the organic light emitting display device  100  according to the first embodiment of the present disclosure, the second openings  44  of the second bank  43  are extended in the second direction, so that the second bank  43  is not positioned between the sub-pixels SP adjacent to each other in the second direction. 
     Accordingly, in the organic light emitting display device  100  according to the first embodiment of the present disclosure, the above-described position constraints on the first bank  41  are relatively low, thereby improving the degree of design freedom and providing a wide emission area on the first electrodes  30 . Thus, the present disclosure may enable more flexibility in terms of design freedom while ensuring a sufficiently large aperture ratio. 
     Further, in a high-resolution display device, the area of the sub-pixels SP is relatively reduced. In this case, the organic light emitting material, which is not dropped at its proper position, may cause a color mixing defect in which the organic light emitting layers  50  of different colors are mixed. The organic light emitting display device  100  according to the first embodiment of the present disclosure has the advantage of improving such a color mixing defect, because a sufficiently large area, on which the organic light emitting material is dropped, is secured in the second openings  44  corresponding to the sub-pixels SP. 
       FIG.  6    is a cross-sectional view taken along line of  FIG.  4    according to one embodiment. 
     Referring to  FIG.  6   , the circuit element layer and the OLED disposed on the circuit element layer are disposed on the substrate  10 . The circuit element layer may include the thin-film transistor  21  electrically connected to the OLED. As an example, a light-blocking layer  22  is positioned on the substrate  10 . The light-blocking layer  22  functions to reduce the generation of a photocurrent in the transistor by blocking the incidence of external light. A buffer layer  23  is positioned on the light-blocking layer  22 . The buffer layer  23  functions to protect the transistor, formed in a subsequent process, against impurities, such as alkali ions discharged from the light-blocking layer  22 . The buffer layer  23  may be a silicon oxide (SiO x ) layer, a silicon nitride (SiN x ) layer, or a multilayer thereof. 
     A semiconductor layer  212  of the thin-film transistor  21  is positioned on the buffer layer  23 . The semiconductor layer  212  may be made of a silicon semiconductor or an oxide semiconductor. The silicon semiconductor may include amorphous silicon or crystallized polysilicon silicon. The semiconductor layer  212  includes a drain area and a source area including p or n type impurities, and includes a channel between the drain area and the source area. 
     A gate insulating film  25  is positioned on the semiconductor layer  212 . The gate insulating film  25  may be a silicon oxide (SiO x ) film, a silicon nitride (SiN x ) film, or a multi-layer thereof. A gate electrode  211  is positioned in a predetermined area of the semiconductor layer  212  on the gate insulating film  25 , that is, a position corresponding to a channel. The gate electrode  211  is made of one selected from a group comprising of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd) or copper (Cu), or an alloy thereof. Further, the gate electrode  211  may be a multi-layer formed of elements selected from a group comprising of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd) or copper (Cu), or alloys thereof. For example, the gate electrode  211  may be a double layer of molybdenum/aluminum-neodymium or molybdenum/aluminum. 
     An interlayer insulating film  26  for insulating the gate electrode  211  is positioned on the gate electrode  211 . The interlayer insulating film  26  may be formed of a silicon oxide (SiO x ) film, a silicon nitride (SiN x ) film, or a multi-layer thereof. A source electrode  213  and a drain electrode  214  are positioned on the interlayer insulating film  26 . The source electrode  213  and the drain electrode  214  may be formed as a single layer or multi-layer. When the source electrode  213  and the drain electrode  214  are formed as a single layer, the source electrode  213  and the drain electrode  214  may be made of one selected from a group comprising of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd) or copper (Cu), or an alloy thereof. Further, when the source electrode  213  and the drain electrode  214  are formed as a multi-layer, the source electrode  213  and the drain electrode  214  may be formed as a double layer of molybdenum/aluminum-neodymium or a triple-layer of titanium/aluminum/titanium, molybdenum/aluminum/molybdenum, or molybdenum/aluminum-neodymium/molybdenum. 
     Accordingly, the thin-film transistor  21  including the semiconductor layer  212 , the gate electrode  211 , the source electrode  213 , and the drain electrode  214  is formed. 
     The passivation film  27  is positioned on the substrate  10  including the thin-film transistor  21 . The passivation film  27  is an insulating film for protecting elements disposed there below and may be formed of a silicon oxide (SiO x ) film, a silicon nitride (SiN x ) film, or a multi-layer thereof. The overcoat layer  28  is positioned on the passivation film  27 . The overcoat layer  28  may be a planarization film for planarizing an uneven surface of the structure disposed there below and is made of an organic material such as polyimide, a benzocyclobutene series resin, or an acrylate. A sub-pixel contact hole  29  passing through the passivation film  27  to expose the source electrode  213  is positioned in some region of the overcoat layer  28 . 
     The OLED is formed on the overcoat layer  28 . The OLED includes the first electrode  30  connected to the thin-film transistor, the second electrode  60  facing the first electrode  30 , and the organic light emitting layer  50  interposed between the first electrode  30  and the second electrode  60 . The first electrode  30  may be an anode and the second electrode  60  may be a cathode. 
     The first electrode  30  may be positioned on the overcoat layer  28  and connected to the source electrode  213  of the transistor through the sub-pixel contact hole  29  passing through the overcoat layer  28 . One first electrode  30  may be allocated per sub-pixel, but the present disclosure is not limited thereto. The first electrode  30  may be formed of a transparent conductive material such as indium tin oxide (ITO), indium zinc oxide (IZO) or zinc oxide (ZnO) to function as a transparent electrode or may include a reflective layer to function as a reflective electrode in response to an adopted emission method. The reflective layer may be made of aluminum (Al), copper (Cu), silver (Ag), nickel (Ni), or an alloy thereof, and in one embodiment, may be made of APC (silver/palladium/copper alloy). 
     The bank  40  is disposed on the substrate  10  on which the first electrode  30  is formed. The bank  40  includes the first bank  41  and the second bank  43 . The first bank  41  and the second bank  43  include openings that expose most of the first electrodes  30 . 
     The organic light emitting layer  50  is disposed on the substrate  10  on which the bank  40  is formed. The organic light emitting layer  50  includes a light emitting layer (EML) and may further include one or more of common layers such as a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). The bank  40  includes a first bank  41  and a second bank  43 . 
     The first bank  41  includes first openings  42  that expose a plurality of first electrodes  30  arranged in a row direction. The second bank  43  includes second openings  44  that expose a plurality of first electrodes  30  arranged in a column direction. 
     The second electrode  60  is disposed on the organic light emitting layer  50 . The second electrode  60  may be widely formed over the entire surface of the substrate  10 . The second electrode  60  may function as a transparent electrode or a reflective electrode in response to an adopted emission method. When the second electrode  60  is a transparent electrode, the second electrode  60  may be made of a transparent conductive material such as ITO or IZO or formed using a thin film of magnesium (Mg), calcium (Ca), aluminum (Al), silver (Ag), or an alloy thereof, which may allow light to pass therethrough. 
       FIGS.  7 A to  7 C  are views for describing a dewetting phenomenon at an edge portion. 
     Referring to  FIGS.  7 A to  7 C , when an organic light emitting material  56  is dropped on the substrate  10 , the organic light emitting material  56  is dropped into the second opening  44  of the second bank  43  divided into the display area AA and the non-display area NA. At the beginning of dropping, the organic light emitting material  56  is formed in the display area AA and the non-display area NA with a uniform thickness. 
     In the process of drying the organic light emitting material  56 , the non-display area NA around the display area AA of the substrate  10  has a lower vapor pressure than the center of the display area AA, so that natural drying proceeds faster in the non-display area NA compared to the display area AA. In this case, the thickness of the organic light emitting material  56  increases toward the center of the display area AA due to the cohesive force of the liquid and the convection phenomenon of ambient vapor pressure. 
     In other words, while the organic light emitting material  56  is drying, a phenomenon occurs in which the organic light emitting material  56  is rapidly dried at an outer periphery of the display area AA and aggregates at a central portion of the display area. Accordingly, the dewetting phenomenon at the edge portion may occur in which the amount of the organic light emitting material  56  decreases in the non-display area NA outside the display area AA. 
     Accordingly, a defect may occur in which the thickness of the organic light emitting layer formed after drying is not uniform according to position, that is, the thickness of a central portion of the organic light emitting layer, at which the organic light emitting material aggregates, is increased, and the thickness of a peripheral portion thereof is decreased due to the phenomenon in which the organic light emitting material  56  aggregates at the central portion of the display area AA of the second opening  44 . This appears to a user as a luminance difference between the peripheral portion and the central portion, leading to display quality deterioration 
     Second Embodiment 
       FIG.  8    is an enlarged plan view of the area AR of  FIG.  1    schematically illustrating an organic light emitting display device according to a second embodiment of the present disclosure.  FIGS.  9 A to  9 C  are cross-sectional views taken along line IV-IV′, V-V′, and VI-VI′ of  FIG.  8   , respectively.  FIG.  10    is a plan view illustrating second openings, third openings, and fourth openings of the organic light emitting display device according to the second embodiment of the present disclosure. 
     Referring to  FIGS.  8  and  9 A to  9 C , an organic light emitting display device  200  according to the second embodiment of the present disclosure includes a substrate  10  having a display area AA in which sub-pixels SP are arranged and a non-display area NA outside the display area AA. The substrate  10  may have various planar shapes. For example, as shown in the drawings, the substrate may include all planar shapes such as a square shape, a circular shape, and an elliptical shape, as well as a rectangular shape. A first direction (e.g., X-axis direction) and a second direction (e.g., Y-axis direction) that intersect each other regardless of the planar shape of the substrate  10  are defined in the substrate  10 . The position and arrangement relation of the sub-pixels and/or the openings may be defined by the first direction and the second direction. 
     A circuit element layer  20  and an OLED driven by elements provided in the circuit element layer  20  are disposed on the substrate  10 . 
     A signal line and electrodes for applying a driving signal to the OLED may be arranged in the circuit element layer  20 , and the signal line and the electrodes may be spaced apart and disposed with at least one insulating layer interposed therebetween as necessary. When the organic light emitting display device is implemented in an AM manner, the circuit element layer  20  may further include a thin-film transistor  21  allocated to each sub-pixel SP. In the following, for convenience of description, a case in which the thin-film transistor  21  is allocated to each sub-pixel will be described as an example. In this case, a passivation film  27  and an overcoat layer  28  are interposed between the thin-film transistor  21  and the OLED. The passivation film  27  includes an inorganic material and protects internal elements. The overcoat layer  28  includes a predetermined organic material and is formed to have a predetermined thickness, and compensates for a step difference due to the thin-film transistor  21  and the signal lines formed there below. 
     As shown in  FIG.  9 A , an overcoat layer  28  may be disposed in the display area AA and the non-display area NA. That is, the overcoat layer  28  may be continuously disposed over the display area AA and the non-display area NA. 
     The OLED includes a first electrode  30 , a second electrode  60 , and an organic light emitting layer  50  interposed between the first electrode  30  and the second electrode  60 . The first electrode  30  may be an anode, and the second electrode  60  may be a cathode. 
     Specifically, sub-pixels SP may be arranged in the first direction and the second direction which intersect each other. The sub-pixels SP adjacently arranged in the first direction may emit light of different colors, and the sub-pixels SP adjacently arranged in the second direction may emit light of the same color. The first electrode  30  of the OLED is disposed in the sub-pixels SP. One first electrode  30  may be assigned per sub-pixel SP. 
     A bank  40  is disposed on the first electrode  30 . The bank  40  includes a first bank  41  and a second bank  43 . 
     The first bank  41  is positioned on the first electrode  30 . The first bank  41  includes first openings  42  exposing at least some of the first electrode  30 . One first opening  42  exposes one first electrode  30 . Thus, the number of first openings  42  and the number of first electrodes  30  may correspond to each other. 
     The first bank  41  may be formed to a relatively small thickness so that the first bank is covered by the organic light emitting layer  50 . The first bank  41  may have a hydrophilic property. As an example, the first bank  41  may be made of a hydrophilic inorganic insulating material, such as silicon oxide (SiO 2 ) and silicon nitride (SiN x ). 
     The first bank  41  is formed over the entirety of the display area AA and the non-display area NA. The first opening  42  of the first bank  41  is formed in the display area AA and the non-display area NA. The first opening  42  exposes the first electrode  30  in the display area AA, and exposes the overcoat layer  28  below the first electrode  30  in the non-display area NA. 
     In the drawing, the first opening  42  is illustrated as having an approximately rectangular shape, but the present disclosure is not limited thereto. Further, all the first openings  42  are illustrated as having the same shape and area, but the present disclosure is not limited thereto. At least any one first opening  42  may have a shape and/or area different from that of another first opening  42 . For example, the shape and/or area of the first opening  42  may be appropriately selected in consideration of the lifespan of an organic light emitting material for forming the organic light emitting layer  50  of the OLED. The portion of the first electrode  30  exposed by the first opening  42  may be defined as an emission area. 
     The non-display area NA may further include a dummy area DA. The dummy area DA is an area adjacent to the display area AA in the second direction. The first bank  41  is disposed in the display area AA, and is extended up to the dummy area DA of the non-display area NA. In the dummy area DA, the overcoat layer  28  is interposed between the first bank  41  and the substrate  10 . 
     The second bank  43  is positioned on the substrate  10  on which the first bank  41  is formed. The second bank  43  includes second openings  44  exposing at least some of the first electrode  30 . A plurality of the second openings  44  are arranged side by side in the first direction and extended in the second direction. The second openings  44  are extended in the second direction, and expose a plurality of first electrodes  30  disposed in the second direction. Alternatively, the second openings  44  are extended in the second direction, and expose a plurality of first openings  42  disposed in the second direction. 
     The second bank  43  may have a hydrophobic property. As an example, the second bank  43  may have a form in which an insulating material is coated with a hydrophobic material, and may be made of an insulating material containing a hydrophobic material. The second bank  43  may be made of an organic material. The hydrophobic property of the second bank  43  may function to push an organic light emitting material constituting the organic light emitting layer  50  so that the organic light emitting material does not gather at a central portion of the emission area. In addition, the second bank  43  may function as a barrier for confining an organic light emitting material dropped on a corresponding area in order to prevent organic light emitting materials of different colors from being mixed. 
     In  FIG.  8   , the second opening  44  is illustrated as having an approximately rectangular shape, but the present disclosure is not limited thereto. Further, all the second openings  44  are illustrated as having the same shape and area, but the present disclosure is not limited thereto. At least any one second opening  44  may have a shape and/or area different from that of another second opening  44 . For example, the shape and/or area of the second opening  44  may be properly selected by taking into consideration the lifespan of an organic light emitting material. 
     The second opening  44  is positioned to be outwardly spaced apart from the first opening  42 . That is, the boundary of the first bank  41  is spaced apart from the boundary of the second bank  43  by a predetermined interval. Thus, the first opening  42  may be exposed by the second opening  44 . The second bank  43  is disposed in the display area AA, and the second openings  44  expose the plurality of first electrodes  30  arranged in the display area AA. 
     The second bank  43  includes third openings  46  disposed in the non-display area NA. The third opening  46  is formed in the dummy area DA of the non-display area NA, and exposes the first bank  41  disposed in the dummy area DA. The dummy area DA is a non-display area NA in which the thin-film transistors and the OLED are not disposed. Accordingly, the third opening  46  exposes the first bank  41  and the overcoat layer  28  exposed by the first opening  42  of the first bank  41  in the dummy area DA. The third opening  46  is extended and disposed in the second direction identical to a direction in which the second opening  44  is extended. The third opening  46  is separated from the second opening  44  by the second bank  43  and disposed to be spaced apart therefrom. 
     Meanwhile, the second bank  43  includes fourth openings  48  connecting the second openings  44  and the third openings  46 . The fourth opening  48  is branched from the second opening  44  and connected to the third opening  46  that is formed to be collinear with the second opening  44 . For example, the fourth opening  48  is branched from each of the second opening  44  and the third opening  46 , and extended to connect the second opening  44  and the third opening  46 . The fourth opening  48  is branched from each of the second opening  44  and the third opening  46 , and disposed over the display area AA and the non-display area NA. The fourth opening  48  is disposed in the second bank  43  formed between the third openings  46  adjacent to each other. 
     The organic light emitting layer  50  is positioned on the substrate  10  on which the second bank  43  is formed. The organic light emitting layer  50  may be formed along and within the corresponding second opening  44 , third opening  46 , and fourth opening  48 . That is, an organic light emitting material dropped into the second opening  44  covers the first electrodes  30  and the first banks  41  exposed by the second openings  44 , and is not physically separated by the first bank  41 . In addition, an organic light emitting material dropped into the third opening  46  covers the first bank  41  and the overcoat layer  28  exposed by the third opening  46 , and is not physically separated by the first banks  41 . In addition, an organic light emitting material dropped into the second opening  44  and the third opening  46  is spread along the fourth opening  48 , which is connected to the second opening  44  and the third opening  46 , and fills the fourth opening  48 . 
     An organic light emitting material of the same color is dropped on the plurality of first electrodes  30  exposed by the second openings  44 . This means that light of the same color is emitted from a plurality of sub-pixels SP allocated to a position corresponding to one second opening  44 . In addition, an organic light emitting material of the same color is also dropped into the third opening  46  extending in the same direction as the second opening  44 , and fills the fourth opening  48  connected to the second opening  44  and the third opening  46 . The planar shape of the organic light emitting layer  50  may correspond to the planar shape of the second opening  44 . 
     Organic light emitting materials of different colors may be sequentially and alternately dropped into the corresponding second opening  44 , third opening  46 , and fourth opening  48 . The organic light emitting materials of different colors may include organic light emitting materials which emit red (R), green (G), and blue (B), and as necessary, may further include an organic light emitting material which emits white (W). 
     The second bank  43  is positioned between the first electrodes  30  adjacent to each other in the first direction and prevents differently colored organic light emitting materials dropped into the corresponding second opening  44 , third opening  46 , and fourth opening  48  adjacent to each other in the first direction from being mixed. That is, differently colored organic light emitting materials dropped into the corresponding second opening  44 , third opening  46 , and fourth opening  48  are physically separated by the second bank  43 . 
     As described above, the organic light emitting display device  200  according to the second embodiment of the present disclosure may include the fourth opening  48  connecting the second opening  44  and the third opening  46 . 
     Specifically, the second openings  44 , the third openings  46 , and the fourth openings  48  of the second bank  43  include a first column  71 , a second column  73 , and a third column  75  that include different organic light emitting layers  50 . The first column  71  is an area in which the organic light emitting layer  50  displaying any same color is formed in the second opening  44 , the third opening  46 , and the fourth opening  48  that are arranged in the second direction. The second column  73  is an area which is spaced apart from the first column  71  by a small gap and in which the organic light emitting layer  50  displaying a color different from that of the organic light emitting layer  50  formed in the first column  71  is formed. The third column  75  is an area which is spaced apart from the second column  73  by a small gap and in which the organic light emitting layer  50  displaying a color different from those of the organic light emitting layers  50  formed in the first column  71  and the second column  73  is formed. 
     The second bank  43  includes the second opening  44 , the third opening  46 , and the fourth opening  48  connecting the second opening  44  and the third opening  46  in each of the first column  71 , the second column  73 , and the third column  75 . For example, the fourth opening  48  is formed over the display area AA and the non-display area NA by connecting the second opening  44  formed in the display area AA and the third opening  46  formed in the non-display area NA. The fourth opening  48  is formed in a shape branching from each of the second opening  44  and the third opening  46  in the first direction and extending in the second direction. The fourth opening  48  in the first column  71  may have the same length (e.g., a vertical length) as each of the fourth opening  48  in the second column  73  and the fourth opening  48  in the third column  75 . In addition, a width of the fourth opening  48  in the first column  71  may be equal to a width of each of the fourth opening  48  in the second column  73  and the fourth opening  48  in the third column  75 . 
     The fourth opening  48  is formed to have a width smaller than that of each of the second opening  44  disposed in the display area AA and the third opening  46  disposed in the non-display area NA. Since the fourth opening  48  is formed to have a width smaller than those of the second opening  44  and the third opening  46 , when the organic light emitting material is dropped and spread evenly in the second opening  44  and the third opening  46 , a capillary phenomenon acts so that the organic light emitting material moves well through the fourth opening  48 . 
     As described in the aforementioned first embodiment, when the organic light emitting material is dropped and then dried, the organic light emitting material is rapidly dried at the peripheral portion of the display area AA and aggregates at the central portion of the display area AA, so that the thickness of the organic light emitting layer is not uniformly formed. 
     The organic light emitting display device  200  according to the second embodiment of the present disclosure may include the dummy area DA in the non-display area NA other than the display area AA, and include the fourth opening  48  connecting the third opening  46  disposed in the dummy area DA to the second opening  44  disposed in the display area AA. The third opening  46  stores the dropped organic light emitting material. The organic light emitting material stored in the third opening  46  may be fill the second opening  44  due to the capillary phenomenon caused by the fourth opening  48  having a small width. 
     For example, when the organic light emitting material dropped into the second opening  44  disposed in an edge portion of the display area AA is rapidly dried, and the organic light emitting material aggregates at the central portion of the display area AA, the organic light emitting material, which is dropped into the third opening  46  disposed in the dummy area DA, fills the second opening  44  through the fourth opening  48 . That is, since the organic light emitting material is continuously supplied to the second opening  44  disposed at the edge portion of the display area AA, the amount of the organic light emitting material of the second opening  44  disposed at the edge portion may be maintained to some extent. Accordingly, the organic light emitting layer formed after the organic light emitting material is dried may have a uniform thickness at the edge portion and the central portion of the display area AA, so that luminance non-uniformity may be prevented or reduced, thereby improving display quality. 
     Referring to  FIG.  10   , a width W 1  of the fourth opening  48  may be formed to be less than the width of each of the second opening  44  and the third opening  46 . In particular, the width W 1  of the fourth opening  48  may be formed to be less than a width W 2  of the second bank  43  formed between the adjacent third openings  46 . For example, the width W 1  of the fourth opening  48  may be formed to be 5% to 30% of the width W 2  of the second bank  43  formed between the adjacent third openings  46 . When the width W 1  of the fourth opening  48  is greater than or equal to 5% of the width W 2  of the second bank  43  formed between the adjacent third openings  46 , the organic light emitting material in the third opening  46  may be smoothly moved through the fourth opening  48 . When the width W 1  of the fourth opening  48  is less than or equal to 30% of the width W 2  of the second bank  43  formed between adjacent third openings  46 , a situation in which the capillary phenomenon does not occur due to a large width W 1  of the fourth opening  48 . 
     Third Embodiment 
       FIG.  11    is an enlarged plan view of the area AR of  FIG.  1    schematically illustrating an organic light emitting display device according to a third embodiment of the present disclosure.  FIG.  12    is a plan view illustrating second openings, third openings, and fourth openings of the organic light emitting display device according to the third embodiment of the present disclosure. 
     Referring to  FIG.  11   , an organic light emitting display device  300  according to the third embodiment of the present disclosure includes a substrate  10  having a display area AA in which sub-pixels SP are arranged and a non-display area NA outside the display area AA. Although not shown in the drawings, a circuit layer  20  including a thin-film transistor  21 , a passivation film  27 , and an overcoat layer  28  may be provided on the substrate  10  similar to the second embodiment described above. 
     Specifically, the sub-pixels SP may be arranged in the first direction and the second direction which intersect each other. A first electrode  30  of an OLED is disposed in the sub-pixels SP. One first electrode  30  may be assigned per sub-pixel SP. 
     A bank  40  is disposed on the first electrode  30 . The bank  40  includes a first bank  41  and a second bank  43 . 
     The first bank  41  is positioned on the first electrode  30 . The first bank  41  includes first openings  42  exposing at least some of the first electrode  30 , and may have a hydrophilic property. The first bank  41  is formed over the entirety of the display area AA and the non-display area NA. The non-display area NA may further include a dummy area DA. The dummy area DA is an area adjacent to the display area AA in the second direction. 
     The second bank  43  is positioned on the substrate  10  on which the first bank  41  is formed. The second bank  43  includes second openings  44  exposing at least some of the first electrode  30 . A plurality of the second openings  44  are arranged side by side in the first direction and extended in the second direction. The second openings  44  are extended in the second direction, and expose a plurality of first electrodes  30  disposed in the second direction. Alternatively, the second openings  44  are extended in the second direction, and expose a plurality of first openings  42  disposed in the second direction. The second bank  43  may have a hydrophobic property. 
     The second opening  44  is positioned to be outwardly spaced apart from the first opening  42 . That is, the boundary of the first bank  41  is spaced apart from the boundary of the second bank  43  by a predetermined interval. Thus, the first opening  42  may be exposed by the second opening  44 . The second bank  43  is disposed in the display area AA, and the second openings  44  expose the plurality of first electrodes  30  arranged in the display area AA. 
     The second bank  43  includes third openings  46  disposed in the non-display area NA. The third opening  46  is formed in the dummy area DA of the non-display area NA, and exposes the first bank  41  disposed in the dummy area DA. The third opening  46  is extended and disposed in the second direction identical to a direction in which the second opening  44  is extended. The third opening  46  is separated from the second opening  44  by the second bank  43  and disposed to be spaced apart therefrom. 
     The second bank  43  includes fourth openings  48  connecting the second openings  44  and the third openings  46 . The fourth opening  48  is branched from the second opening  44  and connected to the third opening  46  that is formed to be collinear with the second opening  44 . For example, the fourth opening  48  is branched from each of the second opening  44  and the third opening  46  and is extended to connect the second opening  44  and the third opening  46 . The fourth opening  48  is branched from each of the second opening  44  and the third opening  46 , and disposed over the display area AA and the non-display area NA. The fourth opening  48  is disposed in the second bank  43  formed between the adjacent third openings  46 . 
     An organic light emitting material of the same color is dropped on the plurality of first electrodes  30  exposed by the second openings  44 . This means that light of the same color is emitted from a plurality of sub-pixels SP allocated to a position corresponding to one second opening  44 . In addition, an organic light emitting material of the same color is also dropped into the third opening  46  extending in the same direction as the second opening  44 , and fills the fourth opening  48  connected to the second opening  44  and the third opening  46 . The planar shape of the organic light emitting layer  50  may correspond to the planar shape of the second opening  44 . 
     Organic light emitting materials of different colors may be sequentially and alternately dropped into the corresponding second opening  44 , third opening  46 , fourth opening  48 . The organic light emitting materials of different colors may include organic light emitting materials which emit red (R), green (G), and blue (B), and as necessary, may further include an organic light emitting material which emits white (W). 
     The second bank  43  is positioned between the first electrodes  30  adjacent to each other in the first direction and prevents differently colored organic light emitting materials dropped into the corresponding second opening  44 , third opening  46 , and fourth opening  48  adjacent to each other in the first direction from being mixed. That is, differently colored organic light emitting materials dropped into the corresponding second opening  44 , third opening  46 , and fourth opening  48  are physically separated by the second bank  43 . 
     As described above, the organic light emitting display device  300  according to the third embodiment of the present disclosure may include the fourth opening  48  connecting the second opening  44  and the third opening  46 . 
     Specifically, the second openings  44 , the third openings  46 , and the fourth openings  48  of the second bank  43  include a first column  71 , a second column  73 , and a third column  75  that include different organic light emitting layers. The first column  71  is an area in which the organic light emitting layer displaying any one color is formed in the second opening  44 , the third opening  46 , and the fourth opening  48  that are arranged in the second direction. The second column  73  is an area which is spaced apart from the first column  71  by a small gap and in which the organic light emitting layer displaying a color different from that of the organic light emitting layer formed in the first column  71  is formed. The third column  75  is an area which is spaced apart from the second column  73  by a small gap and in which the organic light emitting layer displaying a color different from those of the organic light emitting layers formed in the first column  71  and the second column  73  is formed. 
     The second bank  43  includes the second opening  44 , the third opening  46 , and the fourth opening  48  connecting the second opening  44  and the third opening  46  in each of the first column  71 , the second column  73 , and the third column  75 . For example, the fourth opening  48  is formed over the display area AA and the non-display area NA by connecting the second opening  44  formed in the display area AA and the third opening  46  formed in the non-display area NA. The fourth opening  48  is formed in a shape branching from each of the second opening  44  and the third opening  46  in the first direction and extending in the second direction. 
     The fourth opening  48  is formed to have a width smaller than that of each of the second opening  44  disposed in the display area AA and the third opening  46  disposed in the non-display area NA. Since the fourth opening  48  is formed to have a width smaller than those of the second opening  44  and the third opening  46 , when the organic light emitting material is dropped and spread evenly in the second opening  44  and the third opening  46 , a capillary phenomenon acts so that the organic light emitting material moves well through the fourth opening  48 . 
     The organic light emitting display device  300  according to the third embodiment of the present disclosure may include the dummy area DA in the non-display area NA other than the display area AA, and include the fourth opening  48  connecting the third opening  46  disposed in the dummy area DA to the second opening  44  disposed in the display area AA. When the organic light emitting material dropped into the second opening  44  disposed in the edge portion of the display area AA is rapidly dried, and the organic light emitting material aggregates at a central portion of the display area AA, the organic light emitting material, which is dropped into the third opening  46  disposed in the dummy area DA, fills the second opening  44  through the fourth opening  48 . That is, since the organic light emitting material is continuously supplied to the second opening  44  disposed in the edge portion of the display area AA, the amount of the organic light emitting material of the second opening  44  disposed at the edge portion may be maintained to some extent. Accordingly, the organic light emitting layer formed after the organic light emitting material is dried may have a uniform thickness at the edge portion and the central portion of the display area AA, so that luminance non-uniformity may be prevented or reduced, thereby improving display quality. 
     As shown in  FIG.  12   , in the organic light emitting display device  300  according to the third embodiment of the present disclosure, a fourth-first opening  48 - 1  is disposed in a first column  71 , a fourth-second opening  48 - 2  is disposed in a second column  73 , and a fourth-third opening  48 - 3  is disposed in a third column  75 . The fourth-first opening  48 - 1  connects the second opening  44  and the third opening  46  disposed in the first column  71 , the fourth-second opening  48 - 2  connects the second opening  44  and the third opening  46  disposed in the second column  73 , and the fourth-third opening  48 - 3  connects the second opening  44  and the third opening  46  disposed in the third column  75 . 
     Referring to  FIGS.  11  and  12   , a length of the fourth-first opening  48 - 1  may be formed to be greater than a length of each of the fourth-second opening  48 - 2  and fourth-third opening  48 - 3 , and the length of the fourth-second opening  48 - 2  may be formed to be shorter than the length of the fourth-third opening  48 - 3 . 
     The second opening  44  and the third opening  46  connected by the fourth-first opening  48 - 1  in the first column  71 , the second opening  44  and the third opening  46  connected by the fourth-second opening  48 - 2  in the second column  73 , and the second opening  44  and the third opening  46  connected to the fourth-third opening  48 - 3  in the third column  75  may be formed to have different widths. For example, the second opening  44  and the third opening  46  that are formed in the first column  71  may be formed with a red light emitting layer, the second opening  44  and the third opening  46  that are formed in the second column  73  may be formed with a green light emitting layer, and the second opening  44  and the third opening  46  that are formed in the third column  75  may be formed with a blue light emitting layer. The difference between the widths of the second openings  44  respectively formed in the first to third columns  71 ,  73 , and  75  and the difference between the widths of the third openings  46  respectively formed in the first to third columns  71 ,  73 , and  75  may be adjusted according to emission characteristics of each light emitting layer. 
     In the second opening  44  of the first column  71  in which a red light emitting layer having the smallest width is formed, a large amount of a red organic light emitting material relative to a surface area is dropped, so that the degree of the above-described dewetting phenomenon at the edge portion is relatively low. Thus, the length of a path through which the organic light emitting material moves due to the capillary phenomenon is increased by forming the length of the fourth-first opening  48 - 1  of the first column  71  in which the red light emitting layer is formed to be the longest, so that the amount of the organic light emitting material filling the second opening  44  is reduced. 
     Further, in the second opening  44  of the second column  73 , in which the green light emitting layer is formed and which has a relatively greater width than the second opening  44  of the first column  71  in which the red light emitting layer is formed, a small amount of a green organic light emitting material relative to a surface area is dropped, so that the dewetting phenomenon at the edge portion occurs relatively severely. Accordingly, the length of a path through which the organic light emitting material moves due to the capillary phenomenon is decreased by forming the length of the fourth-second opening  48 - 2  of the second column  73 , in which the green light emitting layer is formed, to be less than that of the fourth-first opening  48 - 1 , so that the amount of the organic light emitting material filling the second opening  44  is increased. 
     Further, in the second opening  44  of the third column  75 , in which the blue light emitting layer is formed and which has a relatively greater width than the second opening  44  of the second column  74  in which the green light emitting layer is formed, a small amount of a blue organic light emitting material relative to a surface area is dropped, so that the dewetting phenomenon at the edge portion occurs most severely. However, the visibility of a dewetting phenomenon of a blue color is relatively lower than that of a green color. Thus, the path through which the organic light emitting material moves due to the capillary phenomenon may be adjusted by forming the fourth-third opening  48 - 3  of the third column  75  in which the blue light emitting layer is formed to be shorter than the fourth-first opening  48 - 1  and to be longer than the fourth-second opening  48 - 2 , and accordingly, the amount of the organic light emitting material filling the second opening  44  may be adjusted. 
     The organic light emitting display device  300  according to the third embodiment of the present disclosure has an advantage of remarkably improving display quality deterioration due to the thickness variation of the organic light emitting layer according to position by adjusting the length of each of the fourth-first to fourth-third openings  48 - 1  to  48 - 3  in consideration of the fact that the visibility of the dewetting phenomenon differs for each color emitted by the organic light emitting layer. 
     Alternatively, when the fourth-first opening  48 - 1 , the fourth-second opening  48 - 2  and the fourth-third opening  48 - 3  have the same length (in a vertical direction), the fourth-third opening  48 - 3  may have a width (in a horizontal direction) being greater than the fourth-first opening  48 - 1  and smaller than the fourth-second opening  48 - 2 . 
     Fourth Embodiment 
       FIG.  13    is an enlarged plan view of the area AR of  FIG.  1    schematically illustrating an organic light emitting display device according to a fourth embodiment of the present disclosure.  FIG.  14    is a plan view illustrating second openings, third openings, and fourth openings of the organic light emitting display device according to the fourth embodiment of the present disclosure. 
     Referring to  FIG.  13   , an organic light emitting display device  400  according to the fourth embodiment of the present disclosure includes a substrate  10  having a display area AA in which sub-pixels SP are arranged and a non-display area NA outside the display area AA. Although not shown in the drawings, a circuit layer  20  including a transistor  21 , a passivation film  27 , and an overcoat layer  28  may be provided on the substrate  10  similar to the second embodiment described above. 
     Specifically, the sub-pixels SP may be arranged in the first direction and the second direction which intersect each other. A first electrode  30  of an OLED is disposed in the sub-pixels SP. One first electrode  30  may be assigned per sub-pixel SP. 
     A bank  40  is disposed on the first electrode  30 . The bank  40  includes a first bank  41  and a second bank  43 . 
     The first bank  41  is positioned on the first electrode  30 . The first bank  41  includes first openings  42  exposing at least some of the first electrode  30 , and may have a hydrophilic property. The first bank  41  is formed over the entirety of the display area AA and the non-display area NA. 
     The non-display area NA may further include a dummy area DA. The dummy area DA is an area adjacent to the display area AA in the second direction. The second bank  43  is positioned on the substrate  10  on which the first bank  41  is formed. The second bank  43  includes second openings  44  exposing at least some of the first electrode  30 . A plurality of the second openings  44  are arranged side by side in the first direction and extended in the second direction. The second openings  44  are extended in the second direction, and expose a plurality of first electrodes  30  disposed in the second direction. Alternatively, the second openings  44  are extended in the second direction, and expose a plurality of first openings  42  disposed in the second direction. The second bank  43  may have a hydrophobic property. 
     The second opening  44  is positioned to be outwardly spaced apart from the first opening  42 . That is, the boundary of the first bank  41  is spaced apart from the boundary of the second bank  43  by a predetermined interval. Thus, the first opening  42  may be exposed by the second opening  44 . The second bank  43  is disposed in the display area AA, and the second openings  44  expose the plurality of first electrodes  30  arranged in the display area AA. 
     The second bank  43  includes third openings  46  disposed in the non-display area NA. The third opening  46  is formed in the dummy area DA of the non-display area NA, and exposes the first bank  41  disposed in the dummy area DA. The third opening  46  is extended and disposed in the second direction identical to a direction in which the second opening  44  is extended. The third opening  46  is separated from the second opening  44  by the second bank  43  and disposed to be spaced apart therefrom. 
     The second bank  43  includes fourth openings  48  connecting the second openings  44  and the third openings  46 . The fourth opening  48  is branched from the second opening  44  and connected to the third opening  46  that is formed to be collinear with the second opening  44 . For example, the fourth opening  48  is branched from each of the second opening  44  and the third opening  46 , and extended to connect the second opening  44  and the third opening  46 . The fourth opening  48  is branched from each of the second opening  44  and the third opening  46 , and disposed over the display area AA and the non-display area NA. The fourth opening  48  is disposed in the second bank  43  formed between the adjacent third openings  46 . 
     An organic light emitting material of the same color is dropped on the plurality of first electrodes  30  exposed by the second openings  44 . This means that light of the same color is emitted from a plurality of sub-pixels SP allocated to a position corresponding to one second opening  44 . In addition, an organic light emitting material of the same color is also dropped into the third opening  46  extending in the same direction as the second opening  44 , and fills the fourth opening  48  connected to the second opening  44  and the third opening  46 . The planar shape of the organic light emitting layer  50  may correspond to the planar shape of the second opening  44 . 
     Organic light emitting materials of different colors may be sequentially and alternately dropped into the corresponding second opening  44  and third opening  46 . The organic light emitting materials of different colors may include organic light emitting materials which emit red (R), green (G), and blue (B), and as necessary, may further include an organic light emitting material which emits white (W). 
     The second bank  43  is positioned between the first electrodes  30  adjacent to each other in the first direction and prevents differently colored organic light emitting materials dropped into the corresponding second opening  44  and third opening  46  adjacent to each other in the first direction from being mixed. That is, differently colored organic light emitting materials dropped into the corresponding second opening  44  and third opening  46  are physically separated by the second bank  43 . 
     As described above, in the fourth embodiment of the present disclosure, the fourth opening  48  connecting the second opening  44  and the third opening  46  may be provided. 
     Specifically, the second openings  44 , the third openings  46 , and the fourth openings  48  of the second bank  43  include a first column  71 , a second column  73 , and a third column  75  that include different organic light emitting layers. The first column  71  is an area in which the organic light emitting layer displaying any one color is formed in the second opening  44  and the third opening  46  that are arranged in the second direction. The second column  73  is an area which is spaced apart from the first column  71  by a small gap and in which the organic light emitting layer displaying a color different from that of the organic light emitting layer formed in the first column  71  is formed. The third column  75  is an area which is spaced apart from the second column  73  by a small gap and in which the organic light emitting layer displaying a color different from those of the organic light emitting layers formed in the first column  71  and the second column  73  is formed. 
     In the organic light emitting display device  400  according to the fourth embodiment of the present disclosure, the second bank  43  includes the second opening  44 , the third opening  46 , and the fourth opening  48  connecting the second opening  44  and the third opening  46 . For example, the fourth opening  48  is formed over the display area AA and the non-display area NA by connecting the second opening  44  formed in the display area AA and the third opening  46  formed in the non-display area NA. The fourth opening  48  is formed in a shape branching from each of the second opening  44  and the third opening  46  in the first direction and extending in the second direction. 
     The fourth opening  48  is formed to have a width smaller than that of each of the second opening  44  disposed in the display area AA and the third opening  46  disposed in the non-display area NA. Since the fourth opening  48  is formed to have a width smaller than those of the second opening  44  and the third opening  46 , when the organic light emitting material is dropped and spread evenly in the second opening  44  and the third opening  46 , a capillary phenomenon acts so that the organic light emitting material moves well through the fourth opening  48 . 
     The organic light emitting display device  400  according to the fourth embodiment of the present disclosure may include the dummy area DA in the non-display area NA other than the display area AA, and include the fourth opening  48  connecting the third opening  46  disposed in the dummy area DA to the second opening  44  disposed in the display area AA. When the organic light emitting material dropped into the second opening  44  disposed in an edge portion of the display area AA is rapidly dried, and the organic light emitting material aggregates at a central portion of the display area AA, the organic light emitting material, which is dropped into the third opening  46  disposed in the dummy area DA, fills the second opening  44  through the fourth opening  48 . That is, since the organic light emitting material is continuously supplied to the second opening  44  disposed at the edge portion of the display area AA, the amount of the organic light emitting material of the second opening  44  disposed at the edge portion may be maintained to some extent. Accordingly, the organic light emitting layer formed after the organic light emitting material is dried may have a uniform thickness at the edge portion and the central portion of the display area AA, so that luminance non-uniformity may be prevented or minimized, thereby improving display quality. 
     In the organic light emitting display device  400  according to the fourth embodiment of the present disclosure, a fourth-first opening  48 - 1  is not disposed in the first column  71 , and a fourth-second opening  48 - 2  is disposed in the second column  73 , and the fourth-third opening  48 - 3  is disposed in the third column  75 . The fourth-second opening  48 - 2  connects the second opening  44  and the third opening  46  disposed in the second column  73 , and the fourth-third opening  48 - 3  connects the second opening  44  and the third opening  46  disposed in the third column  75 . 
     Referring to  FIGS.  13  and  14   , the lengths of the fourth-second opening  48 - 2  and the fourth-third opening  48 - 3  may be formed to be the same. In this case, a width of the fourth-second opening  48 - 2  may be greater than a width of the fourth-third opening  48 - 3 . Alternatively, the length of the fourth-second opening  48 - 2  may be shorter than the length of the fourth-third opening  48 - 3 . In this case, the fourth-second opening  48 - 2  and the fourth-third opening  48 - 3  may be the same width. 
     The second opening  44  and the third opening  46  in the first column  71 , the second opening  44  and the third opening  46  connected by the fourth-second opening  48 - 2  in the second column  73 , and the second opening  44  and the third opening  46  connected by the fourth-third opening  48 - 3  in the third column  75  may have different widths. For example, the second opening  44  and the third opening  46  that are formed in the first column  71  may be formed with a red light emitting layer, the second opening  44  and the third opening  46  that are formed in the second column  73  may be formed with a green light emitting layer, and the second opening  44  and the third opening  46  that are formed in the third column  75  may be formed with a blue light emitting layer. The difference between the widths of the second openings  44  respectively formed in the first to third columns  71 ,  73 , and  75  and the difference between the widths of the third openings  46  respectively formed in the first to third columns  71 ,  73 , and  75  may be adjusted according to emission characteristics of each light emitting layer. 
     In the second opening  44  of the first column  71  in which a red light emitting layer having the smallest width is formed, a large amount of a red organic light emitting material relative to a surface area is dropped, so that the degree of dewetting phenomenon at the edge portion is relatively low, and visibility is low due to the characteristic of a red color. Accordingly, the fourth-first opening  48 - 1  of the first column  71  in which a red light emitting layer is formed is not provided. 
     A small amount of a green organic light emitting material relative to a surface area is dropped into the second opening  44  of the second column  73  in which the green light emitting layer having a great width is formed, so that the dewetting phenomenon at the edge portion is relatively severe. Accordingly, the organic light emitting material fills the second opening  44  due to the capillary phenomenon by providing the fourth-second opening  48 - 2  of the second column  73  in which the green light emitting layer is formed. 
     Further, in the second opening  44  of the third column  75 , in which the blue light emitting layer is formed and which has a relatively greater width than the second opening  44  of the second column  74  in which the green light emitting layer is formed, a small amount of a blue organic light emitting material relative to a surface area is dropped, so that the dewetting phenomenon at the edge portion occurs most severely. However, the visibility of a dewetting phenomenon of a blue color is relatively lower than that of a green color. Accordingly, the length of a path through which the organic light emitting material moves due to the capillary phenomenon is adjusted by forming the length of the fourth-third opening  48 - 3  of the third column  75  in which the blue light emitting layer is formed to be equal to that of the fourth-second opening  48 - 2 , so that the amount of the organic light emitting material filling the second opening  44  is adjusted. 
     The organic light emitting display device  400  according to the fourth embodiment of the present disclosure has an advantage of remarkably improving display quality deterioration due to the thickness variation of the organic light emitting layer according to position by including the fourth-second opening in the second column and the fourth-third opening in the third column but not including the fourth-first opening in the first column in consideration of the fact that the visibility of the dewetting phenomenon differs for each color emitted by the organic light emitting layer. 
     Fifth Embodiment 
       FIG.  15    is an enlarged plan view of the area AR of  FIG.  1    schematically illustrating an organic light emitting display device according to a fifth embodiment of the present disclosure.  FIG.  16    is a plan view illustrating second openings, third openings, and fourth openings of the organic light emitting display device according to the fifth embodiment of the present disclosure. 
     Referring to  FIG.  15   , an organic light emitting display device  500  according to the fifth embodiment of the present disclosure includes a substrate  10  having a display area AA in which sub-pixels SP are arranged and a non-display area NA outside the display area AA. Although not shown in the drawings, a circuit layer  20  including a transistor  21 , a passivation film  27 , and an overcoat layer  28  may be provided on the substrate  10  similar to the second embodiment described above. 
     The sub-pixels SP may be arranged in the first direction and the second direction which intersect each other. A first electrode  30  of an OLED is disposed in the sub-pixels SP. One first electrode  30  may be assigned per sub-pixel SP. 
     A bank  40  is disposed on the first electrode  30 . The bank  40  includes a first bank  41  and a second bank  43 . 
     The first bank  41  is positioned on the first electrode  30 . The first bank  41  includes first openings  42  exposing at least some of the first electrode  30 , and may have a hydrophilic property. The first bank  41  is formed over the entirety of the display area AA and the non-display area NA. The non-display area NA may further include a dummy area DA. The dummy area DA is an area adjacent to the display area AA in the second direction. 
     The second bank  43  includes second openings  44  exposing at least some of the first electrode  30 . A plurality of the second openings  44  are arranged side by side in the first direction and extended in the second direction. The second openings  44  are extended in the second direction, and expose a plurality of first electrodes  30  disposed in the second direction. Alternatively, the second openings  44  are extended in the second direction, and expose a plurality of first openings  42  disposed in the second direction. The second bank  43  may have a hydrophobic property. 
     The second opening  44  is positioned to be outwardly spaced apart from the first opening  42 . That is, the boundary of the first bank  41  is spaced apart from the boundary of the second bank  43  by a predetermined interval. Thus, the first opening  42  may be exposed by the second opening  44 . The second bank  43  is disposed in the display area AA, and the second openings  44  expose the plurality of first electrodes  30  arranged in the display area AA. 
     The second bank  43  includes third openings  46  disposed in the non-display area NA. The third opening  46  is formed in the dummy area DA of the non-display area NA and exposes the first bank  41  disposed in the dummy area DA. The third opening  46  is extended and disposed in the second direction identical to a direction in which the second opening  44  is extended. The third opening  46  is separated from the second opening  44  by the second bank  43  and disposed to be spaced apart therefrom. 
     The second bank  43  includes fourth openings  48  connecting the second openings  44  and the third openings  46 . The fourth opening  48  is branched from the second opening  44  and connected to the third opening  46  that is formed to be collinear with the second opening  44 . For example, the fourth opening  48  is branched from each of the second opening  44  and the third opening  46  and is extended to connect the second opening  44  and the third opening  46 . The fourth opening  48  is branched from each of the second opening  44  and the third opening  46 , and disposed over the display area AA and the non-display area NA. The fourth opening  48  is disposed in the second bank  43  formed between the adjacent third openings  46 . 
     An organic light emitting material of the same color is dropped on the plurality of first electrodes  30  exposed by the second opening  44 . This means that light of the same color is emitted from a plurality of sub-pixels SP allocated to a position corresponding to one second opening  44 . In addition, an organic light emitting material of the same color is also dropped into the third opening  46  extending in the same direction as the second opening  44 , and fills the fourth opening  48  connected to the second opening  44  and the third opening  46 . The planar shape of the organic light emitting layer  50  may correspond to the planar shape of the second opening  44 . 
     Organic light emitting materials of different colors may be sequentially and alternately dropped into the corresponding second opening  44  and third opening  46 . The organic light emitting materials of different colors may include organic light emitting materials which emit red (R), green (G), and blue (B), and as necessary, may further include an organic light emitting material which emits white (W). 
     The second bank  43  is positioned between the first electrodes  30  adjacent to each other in the first direction and prevents differently colored organic light emitting materials dropped into the corresponding second opening  44  and third opening  46  adjacent to each other in the first direction from being mixed. That is, differently colored organic light emitting materials dropped into the corresponding second opening  44  and third opening  46  are physically separated by the second bank  43 . 
     As described above, the organic light emitting display device  500  according to the fifth embodiment of the present disclosure may include the fourth opening  48  connecting the second opening  44  and the third opening  46 . 
     Specifically, the second openings  44 , the third openings  46 , and the fourth openings  48  of the second bank  43  include a first column  71 , a second column  73 , and a third column  75  that include different organic light emitting layers. The first column  71  is an area in which the organic light emitting layer displaying any one color is formed in the second opening  44  and the third opening  46  that are arranged in the second direction. The second column  73  is an area which is spaced apart from the first column  71  by a small gap and in which the organic light emitting layer displaying a color different from that of the organic light emitting layer formed in the first column  71  is formed. The third column  75  is an area which is spaced apart from the second column  73  by a small gap and in which the organic light emitting layer displaying a color different from those of the organic light emitting layers formed in the first column  71  and the second column  73  is formed. 
     In the organic light emitting display device  500  according to the fifth embodiment of the present disclosure, the second bank  43  includes the second opening  44 , the third opening  46 , and the fourth opening  48  connecting the second opening  44  and the third opening  46 . For example, the fourth opening  48  is formed over the display area AA and the non-display area NA by connecting the second opening  44  formed in the display area AA and the third opening  46  formed in the non-display area NA. The fourth opening  48  is formed in a shape branching from each of the second opening  44  and the third opening  46  in the first direction and extending in the second direction. 
     The fourth opening  48  is formed to have a width smaller than that of each of the second opening  44  disposed in the display area AA and the third opening  46  disposed in the non-display area NA. Since the fourth opening  48  is formed to have a width smaller than those of the second opening  44  and the third opening  46 , when the organic light emitting material is dropped and spread evenly in the second opening  44  and the third opening  46 , a capillary phenomenon acts so that the organic light emitting material moves well through the fourth opening  48 . 
     The organic light emitting display device  500  according to the fifth embodiment of the present disclosure may include the dummy area DA in the non-display area NA other than the display area AA, and include the fourth opening  48  connecting the third opening  46  disposed in the dummy area DA to the second opening  44  disposed in the display area AA. When the organic light emitting material dropped into the second opening  44  disposed in the edge portion of the display area AA is rapidly dried, and the organic light emitting material aggregates at a central portion of the display area AA, the organic light emitting material, which is dropped into the third opening  46  disposed in the dummy area DA, fills the second opening  44  through the fourth opening  48 . That is, since the organic light emitting material is continuously supplied to the second opening  44  disposed at the edge portion of the display area AA, the amount of the organic light emitting material of the second opening  44  disposed at the edge portion may be maintained to some extent. Accordingly, the organic light emitting layer formed after the organic light emitting material is dried may have a uniform thickness at the edge portion and the central portion of the display area AA, so that luminance non-uniformity may be prevented or reduced, thereby improving display quality. 
     In the organic light emitting display device  500  according to the fifth embodiment of the present disclosure, a fourth-first opening  48 - 1  is not disposed in the first column  71 , and a fourth-second opening  48 - 2  is disposed in a second column  73 , and a fourth-third opening  48 - 3  is disposed in a third column  75 . As shown in the drawings, a plurality of fourth-second openings  48 - 2  may be disposed in the second column  73 , and the fourth-third opening  48 - 3  may be disposed in the third column  75  in a number less than the number of fourth-second openings  48 - 2  of the second column  73 . The plurality of fourth-second openings  48 - 2  connect the second opening  44  and the third opening  46  disposed in the second column  73 , and the fourth-third opening  48 - 3  connects the second opening  44  and the third opening  46  disposed in the third column  75 . 
     Referring to  FIGS.  15  and  16   , the fourth-third opening  48 - 3  may be disposed in the third column  75  in a number less than the number of fourth-second openings  48 - 2  of the second column  73 . That is, the fourth-second opening  48 - 2  of the second column  73  may be provided in a number greater than the number of fourth-third openings  48 - 3  of the third column  75 . For example, one of the fourth-second openings  48 - 2  is positioned between the third opening  46  (or the second opening  44 ) in the first column  71  and the third opening  46  (or the second opening  44 ) in the second column  73 , and the other one of the fourth-second openings  48 - 2  is positioned between the third opening  46  (or the second opening  44 ) in the second column  73  and the third opening  46  (or the second opening  44 ) in the third column  75 . The fourth-third opening  48 - 3  is positioned between the third opening  46  (or the second opening  44 ) in the third column  73  and the third opening  46  (or the second opening  44 ) in the first column  71 . 
     The second opening  44  and the third opening  46  in the first column  71 , the second opening  44  and the third opening  46  connected by the fourth-second opening  48 - 2  in the second column  73 , and the second opening  44  and the third opening  46  connected by the fourth-third opening  48 - 3  in the third column  75  may have different widths. For example, the second opening  44  and the third opening  46  that are formed in the first column  71  may be formed with a red light emitting layer, the second opening  44  and the third opening  46  that are formed in the second column  73  may be formed with a green light emitting layer, and the second opening  44  and the third opening  46  that are formed in the third column  75  may be formed with a blue light emitting layer. The difference between the widths of the second openings  44  respectively formed in the first to third columns  71 ,  73 , and  75  and the difference between the widths of the third openings  46  respectively formed in the first to third columns  71 ,  73 , and  75  may be adjusted according to emission characteristics of each light emitting layer. 
     In the second opening  44  of the first column  71  in which a red light emitting layer having the smallest width is formed, a large amount of a red organic light emitting material relative to a surface area is dropped, so that the degree of dewetting phenomenon at an edge portion is relatively low, and visibility is low due to the characteristic of a red color. Accordingly, the fourth-first opening  48 - 1  of the first column  71  in which a red light emitting layer is formed is not provided. 
     In the second opening  44  of the second column  73 , in which the green light emitting layer is formed and which has a relatively greater width than the second opening  44  of the first column  71  in which the red light emitting layer is formed, a small amount of a green organic light emitting material relative to a surface area is dropped, so that the dewetting phenomenon at the edge portion occurs relatively severely. Accordingly, the organic light emitting material rapidly fills the second opening  44  due to the capillary phenomenon by providing the plurality of fourth-second openings  48 - 2  of the second column  73  in which the green light emitting layer is formed. 
     Further, in the second opening  44  of the third column  75 , in which the blue light emitting layer is formed and which has a relatively greater width than the second opening  44  of the second column  74  in which the green light emitting layer is formed, a small amount of a blue organic light emitting material relative to a surface area is dropped, so that the dewetting phenomenon at the edge portion occurs most severely. However, the visibility of a dewetting phenomenon of a blue color is relatively lower than that of a green color. Accordingly, the length of a path through which the organic light emitting material moves due to the capillary phenomenon is adjusted by forming the fourth-third opening  48 - 3  of the third column  75  in which the blue light emitting layer is formed in a number less than the number of fourth-second openings  48 - 2  is adjusted, so that the amount of the organic light emitting material filling the second opening  44  is adjusted. 
     The organic light emitting display device  500  according to the fifth embodiment of the present disclosure has an advantage of remarkably improving display quality deterioration due to the thickness variation of the organic light emitting layer according to position by including the fourth-second opening of the second column in a number greater than the number of fourth-third openings of the third column and not including the fourth-first opening in the first column in consideration of the fact that the visibility of the dewetting phenomenon differs for each color emitted by the organic light emitting layer. 
     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.