Patent Publication Number: US-10319951-B2

Title: Organic light-emitting display device and method for manufacturing the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the priority of Korean Application No. 10-2016-0161469, filed on Nov. 30, 2016, the entirety of which is hereby incorporated by reference. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to an organic light-emitting display (OLED) device and a method for manufacturing the same. 
     2. Discussion of the Related Art 
     With the advancement of an information-oriented society, various requirements for a display device for displaying an image are increasing. Thus, various display devices, including a liquid crystal display (LCD) device, a plasma display panel (PDP) device, and an organic light-emitting display (OLED) device, have been utilized. 
     The OLED device is a self light-emitting display device. In comparison to the LCD device, the OLED device has wider viewing angle and greater contrast ratio. Also, the OLED device may be fabricated to be lightweight and slim, as it does not need a separate light source, unlike the LCD device. Furthermore, the OLED device is advantageous in view of power consumption. In addition, the OLED device may be driven by a low DC voltage, and a response speed of the OLED device is rapid. In addition, the OLED device may have the advantage of low manufacturing cost. 
     The OLED device may include pixels respectively provided with organic light-emitting devices, and a bank for dividing the pixels to define the pixels. The bank functions as a pixel defining film. The organic light-emitting device may include an anode electrode, a hole transporting layer, an organic light-emitting layer, an electron transporting layer, and a cathode electrode. In this case, when a high potential voltage is applied to the anode electrode, and a low potential voltage is applied to the cathode electrode, holes and electrons are respectively moved to the organic light-emitting layer via the hole transporting layer and the electron transporting layer, and are then combined to each other in the organic light-emitting layer to thereby emit light. 
     Each pixel may include a red pixel including a red organic light-emitting layer for emitting red light, a green pixel including a green organic light-emitting layer for emitting green light, and a blue pixel including a blue organic light-emitting layer for emitting blue light. In this case, the red organic light-emitting layer is formed in the red pixels by the use of first fine metal mask (FMM) having an opening for the red pixels, the green organic light-emitting layer is formed in the green pixels by the use of second FMM having an opening for the green pixels, and the blue organic light-emitting layer is formed in the green pixels by the use of third FMM having an opening for the blue pixels. 
     Before carrying out the above FMM process, an alignment inspection is carried out to check whether the red organic light-emitting layer, the green organic light-emitting layer, and the blue organic light-emitting layer are properly aligned in the respective red, green, and blue pixels on an inspection substrate (test substrate). That is, an alignment error for each of the red organic light-emitting layer, the green organic light-emitting layer, and the blue organic light-emitting layer is checked by the use of additional inspection substrate. 
     SUMMARY 
     Accordingly, the present disclosure is directed to an organic light-emitting display device and a method for manufacturing the same that substantially obviate one or more of the issues due to limitations and disadvantages of the related art. 
     An aspect of the present disclosure is to provide an organic light emitting display device which includes organic light emitting layers for an alignment inspection on a substrate provided with thin film transistors so as to reduce a manufacturing cost by omitting an additional inspection substrate, and a method for manufacturing the same. 
     Additional features and aspects will be set forth in the description that follows, and in part will be apparent from the description, or may be learned by practice of the inventive concepts provided herein. Other features and aspects of the inventive concepts may be realized and attained by the structure particularly pointed out in the written description, or derivable therefrom, and the claims hereof as well as the appended drawings. 
     To achieve these and other aspects of the inventive concepts as embodied and broadly described, there is provided an organic light-emitting display (OLED) device, including: a substrate, a display area on the substrate, the display area including: a first pixel including a first organic light-emitting layer configured to emit first-colored light, a second pixel including a second organic light-emitting layer configured to emit second-colored light, and a third pixel including a third organic light-emitting layer configured to emit third-colored light, and an inspection pattern area in a non-display area on the substrate, the inspection pattern area including a first inspection pixel including a first inspection organic light-emitting layer including a same material as that of the first organic light-emitting layer. 
     In another aspect, there is provided a method for manufacturing an OLED device, the method including: providing a first substrate, the first substrate including: a display area, and a non-display area, providing first electrodes and inspection keys on the first substrate, providing a common hole transporting layer in first to third pixels of the display area using a first open mask including an opening corresponding to the display area, providing first hole transporting layers in the first pixels of the display area and a second inspection pixel of the non-display area using a first mask, providing second hole transporting layers in the second pixels of the display area and a fourth inspection pixel of the non-display area using a second mask, providing first organic light-emitting layers in the first pixels of the display area and a first inspection pixel of the non-display area using a third mask, providing second organic light-emitting layers in the second pixels of the display area and a third inspection pixel of the non-display area using a fourth mask, and providing third organic light-emitting layers in the third pixels of the display area and a fifth inspection pixel of the non-display area using a fifth mask. 
     Other systems, methods, features and advantages will be, or will become, apparent to one with skill in the art upon examination of the following figures and detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the present disclosure, and be protected by the following claims. Nothing in this section should be taken as a limitation on those claims. Further aspects and advantages are discussed below in conjunction with the embodiments of the disclosure. It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are examples and explanatory, and are intended to provide further explanation of the disclosure as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, that are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and together with the description serve to explain various principles of the disclosure. 
         FIG. 1  is a perspective view illustrating an OLED device according to an embodiment of the present disclosure. 
         FIG. 2  is a plane view illustrating a first substrate, a gate driver, a source drive integrated circuit (IC), a flexible film, a circuit board, and a timing controller of  FIG. 1 . 
         FIG. 3  illustrates one example showing a display area, a gate driver, an inspection pattern area, a second electrode, a pad area, and a dam on a first substrate of  FIG. 2 . 
         FIG. 4  is a cross-sectional view taken along line I-I′ of  FIG. 3 . 
         FIG. 5  is a cross-sectional view taken along line II-II′ of  FIG. 3 . 
         FIG. 6  is a cross-sectional view taken along line III-III′ of  FIG. 3 . 
         FIG. 7  illustrates another example showing a display area, a gate driver, an inspection pattern area, a second electrode, a pad area, and a dam on the first substrate of  FIG. 2 . 
         FIG. 8  illustrates another example showing a display area, a gate driver, an inspection pattern area, a second electrode, a pad area, and a dam on the first substrate of  FIG. 2 . 
         FIG. 9  is a flow chart illustrating a method for manufacturing an OLED device according to an embodiment of the present disclosure. 
         FIGS. 10A to 10F  are plane views illustrating an open mask and first to fifth fine metal masks (FMMs) disposed on a first substrate. 
         FIG. 11  illustrates an example showing an alignment error calculation method for a first inspection pixel. 
     
    
    
     Throughout the drawings and the detailed description, unless otherwise described, the same drawing reference numerals should be understood to refer to the same elements, features, and structures. The relative size and depiction of these elements may be exaggerated for clarity, illustration, and convenience. 
     DETAILED DESCRIPTION 
     Reference will now be made in detail to some embodiments of the present disclosure, examples of that may be illustrated in the accompanying drawings. In the following description, when a detailed description of well-known functions or configurations related to this document is determined to unnecessarily cloud a gist of the inventive concept, the detailed description thereof will be omitted. The progression of processing steps and/or operations described is an example; however, the sequence of steps and/or operations is not limited to that set forth herein and may be changed as is known in the art, with the exception of steps and/or operations necessarily occurring in a particular order. Like reference numerals designate like elements throughout. Names of the respective elements used in the following explanations are selected only for convenience of writing the specification and may be thus different from those used in actual products. 
     In the description of embodiments, when a structure is described as being positioned “on or above” or “under or below” another structure, this description should be construed as including a case in which the structures contact each other as well as a case in which a third structure is disposed therebetween. 
     Also, “x-axis direction,” “y-axis direction,” and “z-axis direction” are not limited to a perpendicular geometric configuration. That is, “x-axis direction,” “y-axis direction,” and “z-axis direction” may include an applicable wide range of a functional configuration. 
     Hereinafter, an organic light-emitting display (OLED) device according to the embodiment of the present disclosure and a method for manufacturing the same will be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a perspective view illustrating an OLED device according to an embodiment of the present disclosure.  FIG. 2  is a plane view illustrating a first substrate, a gate driver, a source drive integrated circuit (IC), a flexible film, a circuit board, and a timing controller of  FIG. 1 . 
     With reference to  FIGS. 1 and 2 , the OLED device  100  according to an embodiment of the present disclosure may include a display panel  110 , a gate driver  120 , a source drive integrated circuit (source drive IC)  130 , a flexible film  140 , a circuit board  150 , and a timing controller  160 . The display panel  110  may include a first substrate  111  and a second substrate  112 . The second substrate  112  may be an encapsulation substrate. The first substrate  111  may be a plastic film or a glass substrate. The second substrate  112  may be a plastic film, a glass substrate, or an encapsulation film (or protection film). 
     Gate lines, data lines, and pixels may be on one surface of the first substrate  111  confronting or facing the second substrate  112 . The pixels may be prepared in respective areas defined by crossing the gate lines and the data lines. 
     Each of the pixels may include a thin film transistor, and an organic light-emitting device, including a first electrode, an organic light-emitting layer, and a second electrode. If a gate signal is supplied from the gate line to each pixel through the thin film transistor, a predetermined current may be supplied to the organic light-emitting device in accordance with a data voltage of the data line. Accordingly, the organic light-emitting device for each of the pixels may emit light with a predetermined brightness in accordance with the predetermined current. A structure of each of the pixels will be described in detail with reference to the example of  FIG. 4 . 
     As shown in the  FIG. 2  example, the display panel  110  may include a display area DA provided with the pixels for displaying an image, and a non-display area NDA in which an image is not displayed. The gate lines, the data lines, and the pixels may be provided in the display area DA. The gate driver  120  and pads may be provided in the non-display area NDA. 
     The gate driver  120  may supply gate signals to the gate lines in accordance with a gate control signal, which may be provided from the timing controller  160 . The gate driver  120  may be provided in one side of the display area DA of the display panel  110 , or the non-display area NDA of both peripheral sides of the display panel  110  by a gate-driver-in-panel (GIP) method. In other examples, the gate driver  120  may be manufactured in a driving chip, may be mounted on the flexible film, or may be attached to one side of the display area DA of the display panel  110 , or the non-display area NDA of both peripheral sides of the display panel  110  by a tape automated bonding (TAB) method. 
     The source drive IC  130  may receive digital video data and source control signals from the timing controller  160 . The source drive IC  130  may convert the digital video data into analog data voltages in accordance with the source control signal, and may supply the analog data voltages to the data lines. If the source drive IC  130  is manufactured in a driving chip, the source drive IC  130  may be mounted on the flexible film  140  by a chip on film (COF) method or a chip-on-plastic (COP) method. 
     The pads, such as data pads, may be provided in the non-display area NDA of the display panel  110 . In the flexible film  140 , there may be lines for connecting the pads with the source drive IC  130 , and lines for connecting the pads with the lines of the circuit board  150 . The flexible film  140  may be attached to the pads by the use of anisotropic conducting film, whereby the pads may be connected with the lines of the flexible film  140 . 
     The circuit board  150  may be attached to the flexible film  140 . A plurality of circuits, which may be realized in a plurality of driving chips, may be mounted on the circuit board  150 . For example, the timing controller  160  may be mounted on the circuit board  150 . The circuit board  150  may be a printed circuit board or a flexible printed circuit board. 
     The timing controller  160  may receive digital video data and a timing signal from an external system board via a cable of the circuit board  150 . The timing controller  160  may generate the gate control signal for controlling an operation timing of the gate driver  120  and the source control signal for controlling the source drive IC  130  based on the timing signal. The timing controller  160  may supply the gate control signal to the gate driver  120 , and may supply the source control signal to the source drive IC  130 . 
       FIG. 3  illustrates one example showing a display area, a gate driver, an inspection pattern area, a second electrode, a pad area, and a dam on a first substrate of  FIG. 2 . 
     For convenience of explanation,  FIG. 3  shows only the display area DA, the gate driver GD, the inspection pattern area IPA, the second electrode CAT, the pad area PA, and the dam DAM on the first substrate  111 . With reference to  FIG. 3 , the first substrate  111  may be divided into the display area DA and the non-display area NDA. Pixels P for displaying an image may be in the display area DA. The inspection pattern area IPA, the pad area PA, the gate driver GD, and the second electrode CAT may be in the non-display area NDA. The inspection pattern area IPA may be provided with first to fifth inspection pixels IP 1  to IP 5 , first to sixth inspection keys IK 1  to IK 6 , and an alignment key AK. The pad area PA may be provided with pads. 
     The pixels P for displaying an image may be formed in the display area DA. Each of the pixels P may include first to third sub-pixels P 1 , P 2 , P 3 . Each of the first to third sub-pixels P 1 , P 2 , P 3  is a light-emission area, which may be obtained by sequentially depositing a first electrode corresponding to an anode electrode, an organic light-emitting layer, and a second electrode corresponding to a cathode electrode, wherein holes and electrons may be respectively supplied from the first electrode and the second electrode, and may then be with each other in the organic light-emitting layer to emit light. 
     In the  FIG. 3  example, the first sub-pixel P 1  and the second sub-pixel P 2  may be parallel to each other in a first direction (y-axis direction), and the third sub-pixel P 3  may be adjacent to the first and second sub-pixels P 1 , P 2  in a second direction (x-axis direction) crossing the first direction, but embodiments are not limited to this structure. For example, the first to third sub-pixels P 1 , P 2 , P 3  may be parallel to one another in the first direction (y-axis direction), or the second direction (x-axis direction). 
     The example of  FIG. 3  shows that the pixel P may include the first to third sub-pixels P 1 , P 2 , P 3 . For example, the first sub-pixels P 1  may be a red pixel for emitting red light, the second sub-pixel P 2  may be a green pixel for emitting green light, and the third sub-pixel P 3  may be a blue pixel for emitting blue light, but embodiments are not limited to this structure. For example, the pixel P may further include a fourth sub-pixel in addition to the first to third sub-pixels P 1 , P 2 , P 3 . In one case, the first sub-pixels P 1  may be a red pixel for emitting red light, the second sub-pixel P 2  may be a green pixel for emitting green light, the third sub-pixel P 3  may be a blue pixel for emitting blue light, and the fourth sub-pixel may be a white pixel for emitting white light. 
     The inspection pattern area IPA may be prepared in the non-display area NDA. The inspection pattern area IPA may be prepared in one peripheral side of the display area DA. For example, as shown in the  FIG. 3  example, the inspection pattern area IPA may be prepared in one peripheral side of the display area DA adjacent to the pad area PA. That is, the inspection pattern area IPA may be prepared between the pad area PA and the display area DA. 
     The first to fifth inspection pixels IP 1  to IP 5 , the first to sixth inspection keys IK 1  to IK 6 , and the alignment key AK may be in the inspection pattern area IPA. The first to fifth inspection pixels IP 1  to IP 5  may have different shapes and sizes from those of the first to third sub-pixels P 1 , P 2 , P 3 . In the  FIG. 3  example, each of the first to fifth inspection pixels IP 1  to IP 5  may have a square shape, and the first to third sub-pixels P 1 , P 2 , P 3  may have a rectangular shape, but embodiments are not limited to this structure. 
     The first inspection pixel IP 1  may be a sample pixel that may be provided to inspect an alignment of a first organic light-emitting layer in the first pixel P 1 , and may be disposed in the non-display area NDA. Accordingly, the first inspection pixel IP 1  may not emit light. A first inspection organic light-emitting layer may be formed in the first inspection pixel IP 1 , wherein the first inspection organic light-emitting layer may include the same material as that of the first organic light-emitting layer of the first pixel P 1 . 
     The second inspection pixel IP 2  may be a sample pixel that may be provided to inspect an alignment of a first hole transporting layer in the first pixel P 1 , and may be disposed in the non-display area NDA. Accordingly, the second inspection pixel IP 2  may not emit light. A first inspection hole transporting layer may be formed in the second inspection pixel IP 2 , wherein the first inspection hole transporting layer may include the same material as that of the first hole transporting layer of the first pixel P 1 . 
     The third inspection pixel IP 3  may be a sample pixel that may be provided to inspect an alignment of a second organic light-emitting layer in the second pixel P 2 , and may be disposed in the non-display area NDA. Accordingly, the third inspection pixel IP 3  may not emit light. A second inspection organic light-emitting layer may be formed in the third inspection pixel IP 3 , wherein the second inspection organic light-emitting layer may include the same material as that of the second organic light-emitting layer of the second pixel P 2 . 
     The fourth inspection pixel IP 4  may be a sample pixel that may be provided to inspect an alignment of a second hole transporting layer in the second pixel P 2 , and may be disposed in the non-display area NDA. Accordingly, the fourth inspection pixel IP 4  may not emit light. A second inspection hole transporting layer may be formed in the fourth inspection pixel IP 4 , wherein the second inspection hole transporting layer may include the same material as that of the second hole transporting layer of the second pixel P 2 . 
     The fifth inspection pixel IP 5  may be a sample pixel that may be provided to inspect an alignment of a third organic light-emitting layer in the third pixel P 3 , and may be disposed in the non-display area NDA. Accordingly, the fifth inspection pixel IP 5  may not emit light. A third inspection organic light-emitting layer may be formed in the fifth inspection pixel IP 5 , wherein the third inspection organic light-emitting layer may include the same material as that of the third organic light-emitting layer of the third pixel P 3 . 
     The first inspection key IK 1  may be provided to check an alignment of the first direction (y-axis direction) of the first inspection pixel IP 1 . Accordingly, the first inspection key IK 1  may be extended in the first direction (y-axis direction). Also, the first inspection key IK 1  may be parallel to the first inspection pixel IP 1  and the first sub-pixel P 1  in the first direction (y-axis direction). The first inspection key IK 1  may be disposed between the first inspection pixel IP 1  and the first sub-pixel P 1  provided in the border of the display area DA. 
     The second inspection key IK 2  may be provided to check an alignment of the second direction (x-axis direction) in each of the first to fifth inspection pixels IP 1  to IP 5 . Accordingly, the second inspection key IK 2  may be extended in the second direction (x-axis direction). Also, the second inspection key IK 2  may be parallel to the first to fifth inspection pixels IP 1  to IP 5  in the second direction (x-axis direction). 
     The third inspection key IK 3  may be provided to check an alignment of the first direction (y-axis direction) of the second inspection pixel IP 2 . Accordingly, the third inspection key IK 3  may be extended in the first direction (y-axis direction). Also, the third inspection key IK 3  may be parallel to the second inspection pixel IP 2  and the first sub-pixel P 1  in the first direction (y-axis direction). The third inspection key IK 3  may be disposed between the second inspection pixel IP 2  and the first sub-pixel P 1  provided in the border of the display area DA. 
     The fourth inspection key IK 4  may be provided to check an alignment of the first direction (y-axis direction) of the third inspection pixel IP 3 . Accordingly, the fourth inspection key IK 4  may be extended in the first direction (y-axis direction). Also, the fourth inspection key IK 4  may be parallel to the third inspection pixel IP 3  and the second sub-pixel P 2  in the first direction (y-axis direction). The fourth inspection key IK 4  may be disposed between the third inspection pixel IP 3  and the second sub-pixel P 2  provided in the border of the display area DA. 
     The fifth inspection key IK 5  may be provided to check an alignment of the first direction (y-axis direction) of the fourth inspection pixel IP 4 . Accordingly, the fifth inspection key IK 5  may be extended in the first direction (y-axis direction). Also, the fifth inspection key IK 5  may be parallel to the fourth inspection pixel IP 4  and the second sub-pixel P 2  in the first direction (y-axis direction). The fifth inspection key IK 5  may be disposed between the fourth inspection pixel IP 4  and the second sub-pixel P 2  provided in the border of the display area DA. 
     The sixth inspection key IK 6  may be provided to check an alignment of the first direction (y-axis direction) of the fifth inspection pixel IP 5 . Accordingly, the sixth inspection key IK 6  may be extended in the first direction (y-axis direction). Also, the sixth inspection key IK 6  may be parallel to the fifth inspection pixel IP 5  and the third sub-pixel P 3  in the first direction (y-axis direction). The sixth inspection key IK 6  may be disposed between the fifth inspection pixel IP 5  and the third sub-pixel P 3  provided in the border of the display area DA. 
     The alignment key AK may be provided to align a mask for forming the first to third organic light-emitting layers, or the first and second hole transporting layers. The alignment key AK may be formed in a cross shape, but embodiments are not limited to this shape. 
     The pad area PA may be provided with the plurality of pads PAD. The pad area PA may be disposed at one side of the first substrate  111 . The plurality of pads PAD may be electrically connected with lines of the flexible film  140  by the use of anisotropic conducting film. 
     The gate driver GD may be disposed in the outer area of the other side of the display area DA, or may be disposed in the outer area of both sides of the display area DA. The gate driver GD may be formed in a gate-driver-in-panel (GIP) method including a plurality of thin film transistors. 
     The second electrode CAT may cover the first to fifth inspection pixels IP 1  to IP 5  of the inspection pattern area IPA, as well as the pixels P of the display area DA. As the first and second inspection hole transporting layers provided in the second and fourth inspection pixels IP 2 , IP 4  are formed of a transparent material, the first and second inspection hole transporting layers may have low visibility for the alignment inspection. However, if the second electrode CAT covers the first to fifth inspection pixels IP 1  to IP 5 , the first and second inspection hole transporting layers provided in the second and fourth inspection pixels IP 2 , IP 4  may be easily visible by the metal reflection of the electrodes for the thin film transistors. 
     The dam DAM may be provided between the display area DA and the pad area PA, wherein the dam DAM may prevent an organic film for an encapsulation film from overflowing into the pad area PA. The dam DAM may surround the display area DA. 
     The inspection pattern area IPA may be covered by the second electrode CAT, and the second electrode CAT may be covered by the encapsulation film, whereby the inspection pattern area IPA may be provided between the display area DA and the dam DAM. 
     As described above, the inspection organic light-emitting layers for the alignment inspection may be provided on the non-display area of the first substrate provided with the thin film transistors. As a result, it may be possible to omit an inspection substrate, to thereby reduce a manufacturing cost. Also, the inspection hole transporting layers for the alignment inspection may be provided in the non-display area of the first substrate, whereby it may be possible to inspect the alignment of the hole transporting layers, as well as the organic light-emitting layers. 
     Also, the first to sixth inspection keys may be provided in the non-display area of the first substrate. Foe example, the first, third, fourth, fifth, and sixth inspection keys may be provided in the first direction, and the second inspection key may be provided in the second direction crossing to the first direction while being parallel to the first to fifth inspection pixels. Therefore, it may be possible to inspect the alignment of the inspection organic light-emitting layers of the first to fifth inspection pixels and the alignment for the first direction of the inspection hole transporting layers by the use of first, third, fourth, fifth, and sixth inspection keys, and to inspect the alignment for the second direction by the use of second inspection key. 
       FIG. 4  is a cross-sectional view taken along line I-I′ of  FIG. 3 .  FIG. 5  is a cross-sectional view taken along line II-II′ of  FIG. 3 .  FIG. 6  is a cross-sectional view taken along line III-III′ of  FIG. 3 . 
     The example of  FIG. 4  shows the first to third sub-pixels P 1 , P 2 , P 3  of the display area DA of  FIG. 3 . The example of  FIG. 5  shows the first sub-pixel P 1  of the display area DA, the first inspection key IK 1 , and the first inspection pixel IP 1  of the inspection pattern area IPA, and the pad PAD of the pad area PA. The example of  FIG. 6  shows the second inspection key IK 2  and the first to fifth inspection pixels IP 1  to IP 5  of the inspection pattern area IPA. Hereinafter, the first to third sub-pixels P 1 , P 2 , P 3  of the display area DA, the inspection pattern area IPA, and the pad area PA will be described in detail with reference to  FIGS. 4 to 6 . 
     First, the first to third sub-pixels P 1 , P 2 , P 3  of the display area DA will be described in detail with reference to  FIG. 4 . With reference to the  FIG. 4  example, a buffer film may be provided on one surface of the first substrate  111 . The buffer film may be provided on one surface of the first substrate  111  to protect thin film transistors  210  and organic light-emitting devices  260  from moisture permeating through the first substrate  111 , which may be vulnerable to moisture permeability. Herein, one surface of the first substrate  111  may confront or face the second substrate  112 . The buffer film may be formed of a plurality of inorganic films alternately deposited. For example, the buffer film may be formed in a multi-layered structure by alternately depositing at least one inorganic film, such as a silicon oxide film (SiO x ), a silicon nitride film (SiN x ), and/or silicon oxynitride (SiON). It may be possible to omit the buffer film. 
     The thin film transistor  210  may be provided on the buffer film. The thin film transistor  210  may include an active layer  211 , a gate electrode  212 , a source electrode  213 , and a drain electrode  214 . In the example of  FIG. 4 , the thin film transistor  210  may be provided in a top-gate type in which the gate electrode  212  is positioned above the active layer  211 , but embodiments are not limited to this type. For example, the thin film transistor  210  may be provided in a bottom-gate type in which the gate electrode  212  is positioned below the active layer  211 , or a double-gate type in which the gate electrode  212  is positioned both above and below the active layer  211 . 
     The active layer  211  may be provided on the buffer film. The active layer  211  may be formed a silicon-based semiconductor material or an oxide-based semiconductor material. A light shielding layer may be additionally provided between the buffer film and the active layer  211  to block external light being incident on the active layer  211 . 
     A gate insulating film  220  may be provided on the active layer  211 . The gate insulating film  220  may be formed in a single-layered structure of the inorganic insulating material, such as silicon oxide (SiO x ) or silicon nitride (SiN x ), or a multi-layered structure of the above silicon oxide (SiO x ) and silicon nitride (SiN x ). 
     The gate electrode  212  and gate line may be provided on the gate insulating film  220 . The gate electrode  212  and gate line may be formed in a single-layered structure or multi-layered structure, including, for example, molybdenum (Mo), aluminum (Al), chrome (Cr), aurum (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and their alloys. 
     An insulating interlayer  230  may be provided on the gate electrode  212  and gate line. The insulating interlayer  230  may be formed in a single-layered structure of the inorganic insulating material such as silicon oxide (SiO x ) or silicon nitride (SiN x ), or a multi-layered structure of the above silicon oxide (SiO x ), silicon nitride (SiN x ) and their alloys. 
     The source electrode  213 , the drain electrode  214 , and the data line may be provided on the insulating interlayer  230 . Each of the source electrode  214  and the drain electrode  214  may be connected with the active layer  211  via a contact hole penetrating through the gate insulating film  220  and the insulating interlayer  230 . The source electrode  213 , the drain electrode  214 , and the data line may be formed in a single-layered structure or multi-layered structure, including, for example, molybdenum (Mo), aluminum (Al), chrome (Cr), aurum (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and their alloys. 
     A protection film  240  for an insulation of the thin film transistor  210  may be provided on the source electrode  213 , the drain electrode  214 , and the data line. The protection film  240  may be formed in a single-layered structure of the inorganic material, such as silicon oxide (SiO x ) or silicon nitride (SiN x ), or a multi-layered structure of the above silicon oxide (SiO x ) and silicon nitride (SiN x ). 
     A planarization film  250  may be provided on the protection film  240  to planarize a step difference area caused by the thin film transistor  210 . The planarization film  250  may be formed of an organic material, for example, acryl resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, etc. 
     An organic light-emitting device  260  and a bank  270  may be provided on the planarization film  250 . The organic light-emitting device  260  may include hole transporting layers  262   a ,  262   b ,  262   c , organic light-emitting layers  263   a ,  263   b ,  263   c , an electron transporting layer  264 , and a second electrode  265 . The first electrode  261  may serve as an anode electrode, and the second electrode  263  may serve as a cathode electrode. 
     The first electrode  261  may be provided on the planarization film  250 . The first electrode  261  may be connected with the source electrode  213  of the thin film transistor  210  via a contact hole penetrating through the protection film  240  and the planarization film  250 . The first electrode  261  may be formed of a metal material with high reflectance, for example, a deposition structure of aluminum and titanium (Ti/Al/Ti), a deposition structure of aluminum and indium tin oxide (ITO/AL/ITO), an APC alloy, and a deposition structure of APC alloy and indium tin oxide (ITO/APC/ITO). Herein, the APC alloy may be an alloy of silver (Ag), palladium (Pd), and copper (Cu). 
     The bank  270  may be provided to cover the edge of the first electrode  261  on the planarization film  250 , to thereby divide the sub-pixels P 1 , P 2 , P 3 . That is, the bank  270  may function as a pixel-defining film to define the sub-pixels P 1 , P 2 , P 3 . 
     Each of the sub-pixels P 1 , P 2 , P 3  may indicate a light-emission area, wherein the first electrode  261  corresponding to the anode electrode, the organic light-emitting layer  262   a / 262   b / 262   c , and the second electrode  262  corresponding to the cathode electrode may be sequentially deposited in each sub-pixel. Holes and electrons may be respectively supplied from the first electrode and the second electrode, and may then be combined with each other in the organic light-emitting layer  262   a / 262   b / 262   c  to emit light. For example, the area for the bank  270  may not emit light, whereby the area for the bank  270  may be defined as a non-emission area. The bank  270  may be formed of an organic material, for example, acryl resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, etc. 
     The common hole transporting layer  262   a  may be provided on the first electrode  261 . The common hole transporting layer  262   a  may be a common layer provided in the sub-pixels P 1 , P 2 , P 3 . The first hole transporting layer  262   b  may be provided on the common hole transporting layer  262   a  of the first sub-pixel P 1 , and the second hole transporting layer  262   c  may be provided on the common hole transporting layer  262   a  of the second sub-pixel P 2 . The common hole transporting layer  262   a  and the first and second hole transporting layers  262   b  and  262   c  may smoothly transfer the hole injected from the first electrode  261  or p-type charge generation layer  262   c  to the light-emitting layer. 
     Each of the common hole transporting layer  262   a , the first hole transporting layer  262   b , and the second hole transporting layer  262   c  may be formed, e.g., of NPD(N,N-dinaphthyl-N,N′-diphenyl benzidine), TPD(N,N′-bis-(3-methylphenyl)-N,N′-bis-(phenyl)-benzidine), TCTA(4-(9H-carbazol-9-yl)-N,N-bis[4-(9H-carbazol-9-yl)phenyl]-benzenamine), CBP(4,4′-N,N′-dicarbazole-biphenyl), s-TAD, or MTDATA(4,4′,4″-Tris(N-3-methylphenyl-N-phenyl-amino)-triphenylamine), but embodiments are not limited to these materials. 
     A thickness of the first hole transporting layer  262   b  may be different from a thickness of the second hole transporting layer  262   c . For example, as shown in  FIG. 4 , a thickness of the first hole transporting layer  262   b  may be larger than a thickness of the second hole transporting layer  262   c.    
     The common hole transporting layer  262   a  and the first hole transporting layer  262   b  may be provided in the first sub-pixel P 1 . The common hole transporting layer  262   a  and the second hole transporting layer  262   c  may be provided in the second sub-pixel P 2 . Only the common hole transporting layer  262   a  may be provided in the third sub-pixel P 3 . Accordingly, it may be possible to optimize a micro-cavity distance in each of the first to third sub-pixels P 1 , P 2 , P 3  by properly adjusting a thickness of the common hole transporting layer  262   a , a thickness of the first hole transporting layer  262   b , and a thickness of the second hole transporting layer  262   c . Herein, the micro-cavity indicates that the light-emission efficiency is improved by amplification and constructive interference of the light through repetitive reflection and re-reflection of the light emitted from the organic light-emitting layer  262  between the first electrode  261  corresponding to a reflective electrode and the second electrode  263  corresponding to a semi-transmissive electrode. The thickness of the common hole transporting layer  262   a , the thickness of the first hole transporting layer  262   b , and the thickness of the second hole transporting layer  262   c  may be designed in an optimum range through a pretest in consideration of a wavelength of the light emitted from the pixels, and a distance between the first electrode  261  and the semi-transmissive electrode  300 . 
     The first organic light-emitting layer  263   a  may be provided on the first hole transporting layer  262   b  of the first sub-pixel P 1 . The first organic light-emitting layer  263   a  may include a material for emitting first-color light, which may be formed of a phosphorescent or fluorescent material. 
     The second organic light-emitting layer  263   b  may be provided on the second hole transporting layer  262   c  of the second sub-pixel P 2 . The second organic light-emitting layer  263   b  may include a material for emitting second-color light, which may be formed of a phosphorescent or fluorescent material. 
     The third organic light-emitting layer  263   c  may be provided on the common hole transporting layer  262   a  of the third sub-pixel P 3 . The third organic light-emitting layer  263   c  may include a material for emitting third-color light, which may be formed of a phosphorescent or fluorescent material. 
     The electron transporting layer  264  may be provided on the first to third organic light-emitting layers  263   a ,  263   b ,  263   c . The electron transporting layer  264  may be a common layer provided in the sub-pixels P 1 , P 2 , P 3 . The electron transporting layer  264  may transfer the electron injected from the second electrode  263  to the organic light-emitting layer. 
     The electron transporting layer  264  may be formed of, e.g., PBD(2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole), TAZ(3-(4-biphenyl)-4-phenyl-5-tertbutylphenyl-1,2,4-triazole), Liq(8-hydroxyquinolinolato-lithium), BAlq(Bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium), or TPBi(2,2′,2′-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole), but is not limited to these materials. 
     The second electrode  265  may be provided on the first to third organic light-emitting layers  263   a ,  263   b ,  263   c . The second electrode  263  may be a common layer provided in the sub-pixels P 1 , P 2 , P 3 . To realize a micro-cavity structure, the second electrode  265  may be formed of a semi-transmissive conductive material, such as magnesium (Mg), silver (Ag), or alloy of magnesium (Mg) and silver (Ag). A capping layer may be provided on the second electrode  265 . 
     An encapsulation film  280  may be provided on the second electrode  263 . The encapsulation film  280  may reduce or prevent a permeation of oxygen or moisture into the organic light-emitting layer  262  and the second electrode  265 . The encapsulation film  280  may include at least one inorganic film. The inorganic film may be formed of, for example, silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, and/or titanium oxide. 
     Also, the encapsulation film  280  may include at least one organic film. The organic film may be formed at a thickness enough to reduce or prevent particles from getting into the organic light-emitting layer  262  and the second electrode  265  through the encapsulation film  280 . 
     Then, an adhesion layer  290  may be prepared on the encapsulation film  280 . The adhesion layer  290  may be provided to adhere the encapsulation film  280  to the second substrate  112 , whereby the first substrate  111  and the second substrate  112  may be bonded to each other. The adhesion layer  290  may be a transparent adhesion film or transparent adhesion resin. The second substrate  112  may be a plastic film, a glass substrate, or an encapsulation film (protection film). 
     Secondly, the first inspection key IK 1  and the first inspection pixel IP 1  of the inspection pattern area IPA, the pad PAD of the pad area PA, and the dam  300  will be described in detail with reference to  FIG. 5 . With reference to the  FIG. 5  example, the first inspection pixel IP 1  may include the first inspection organic light-emitting layer  363   a , wherein the first inspection organic light-emitting layer  363   a  may include the same material as that of the first organic light-emitting layer  263   a  of the first pixel P 1 . The first inspection organic light-emitting layer  363   a  may include a material for emitting first-color light, which may be formed of a phosphorescent or fluorescent material. The first inspection organic light-emitting layer  363   a  may be disposed on the planarization film  250 . 
     The first inspection key  361   a  may be formed of the same material as that of the first electrode  261 . For example, the first inspection key  361   a  may be formed of a metal material, for example, a deposition structure of aluminum and titanium (Ti/Al/Ti), a deposition structure of aluminum and indium tin oxide (ITO/AL/ITO), an APC alloy, and a deposition structure of APC alloy and indium tin oxide (ITO/APC/ITO). 
     The first inspection key  361   a  may be disposed on the planarization film  250 . The first inspection key  361   a  may be disposed between the first inspection organic light-emitting layer  363   a  and the display area DA. 
     In the example of  FIG. 3 , the inspection pattern area IPA may be provided between the display area DA and the pad area PA, whereby each of the first inspection organic light-emitting layer  363   a  and the first inspection key  361   a  may be overlapped with data link lines  310 . That is, the inspection pattern area IPA may be overlapped with the data link lines  310 . The data link lines  310  may connect the pad  320  of the pad area PA with the data lines of the display area DA. The data link lines  310  may be provided on the gate insulating film  220 , and may be positioned in the same layer as that of the gate electrode  212 , and may be formed of the same material as that of the gate electrode  212 . That is, the data link lines  310  and the gate electrode  212  may be manufactured by the same process. 
     The pad  320  of the display area DA may be provided on the insulating interlayer  230 , and may be formed of the same material as those of the source electrode  213  and the drain electrode  214 . The pad  320  may be connected with the data link line  310  via a contact hole penetrating through the gate insulating film  230 . Also, the pad  320  may be exposed via a contact hole penetrating through the insulating interlayer  230 , whereby the pad  320  may be electrically connected with the flexible film  140  through the use of anisotropic conducting film. 
     The dam  300  may reduce or prevent the organic film  282  of the encapsulation film  280  from overflowing into the pad area PA. The first and second inorganic films  281  and  283  of the encapsulation film  280  may be covered by the dam  300 . However, the organic film  282  may be provided at one side of the dam  300 . A height of the dam  300  may be greater than a height of the organic film  282 . 
     Thirdly, the second inspection key IK 2  and the first to fifth inspection pixels IP 1  to IP 5  of the inspection pattern area IPA will be described in detail with reference to  FIG. 6 . With reference to the example of  FIG. 6 , the first inspection pixel IP 1  may include the first inspection organic light-emitting layer  363   a , which may include the same material as that of the first organic light-emitting layer  263   a  of the first sub-pixel P 1 . The first inspection organic light-emitting layer  363   a  may include the material for emitting the first-color light, which may be formed of the phosphorescent or fluorescent material. The second inspection pixel IP 2  may include the first inspection hole transporting layer  362   a , which may include the same material as that of the first hole transporting layer  362   b  of the first sub-pixel P 1 . 
     The third inspection pixel IP 3  may include the first inspection organic light-emitting layer  363   a , which may include the same material as that of the second organic light-emitting layer  263   a  of the second sub-pixel P 2 . The first inspection organic light-emitting layer  363   a  may include the material for emitting the second-color light, which may be formed of the phosphorescent or fluorescent material. The fourth inspection pixel IP 4  may include the second inspection hole transporting layer  362   b , which may include the same material as that of the second hole transporting layer  362   c  of the second sub-pixel P 2 . 
     The fifth inspection pixel IP 5  may include the third inspection organic light-emitting layer  363   c , which may include the same material as that of the third organic light-emitting layer  263   c  of the third sub-pixel P 3 . The third inspection organic light-emitting layer  363   c  may include the material for emitting the third-color light, which may be formed of the phosphorescent or fluorescent material. 
     The thickness of the first hole transporting layer  262   b  may be different from the thickness of the second hole transporting layer  262   c , whereby a thickness of the first inspection hole transporting layer  362   a  may be different from a thickness of the second inspection hole transporting layer  362   b . For example, the thickness of the first inspection hole transporting layer  362   a  may be larger than the thickness of the second inspection hole transporting layer  362   b.    
     Each of the first and second inspection hole transporting layers  362   a  and  362   b  may be formed of, e.g., NPD(N,N-dinaphthyl-N,N′-diphenyl benzidine), TPD(N,N′-bis-(3-methylphenyl)-N,N′-bis-(phenyl)-benzidine), TCTA(4-(9H-carbazol-9-yl)-N,N-bis[4-(9H-carbazol-9-yl)phenyl]-benzenamine), CBP(4,4′-N,N′-dicarbazole-biphenyl), s-TAD, or MTDATA(4,4′,4″-Tris(N-3-methylphenyl-N-phenyl-amino)-triphenylamine), but embodiments are not limited to these materials. 
     The second inspection key  361   b  may be formed of the same material as that of the first electrode  261 . For example, the second inspection key  361   b  may be formed of a metal material, for example, a deposition structure of aluminum and titanium (Ti/Al/Ti), a deposition structure of aluminum and indium tin oxide (ITO/AL/ITO), an APC alloy, and a deposition structure of APC alloy and indium tin oxide (ITO/APC/ITO). The second inspection key  361   b  may be parallel to the first to third inspection organic light-emitting layers  363   a ,  363   b ,  363   c , and the first and second inspection hole transporting layers  362   a ,  362   b.    
     Meanwhile, the examples of  FIGS. 5 and 6  show only the first and second inspection keys  361   a  and  361   b . Even though not shown, the third to sixth inspection keys IK 3  to IK 6  and the alignment key AK may be provided in the same layer as that of the first electrode  261 , and may be formed of the same material as that of the first electrode  261 . For example, the first to sixth inspection keys IK 1  to IK 6  and the alignment key AK may be manufactured at the same time by the process of forming the first electrode  261 , whereby there may be no additional process for forming the first to sixth inspection keys IK 1  to IK 6  and the alignment key AK. The first to third inspection organic light-emitting layers  363   a ,  363   b ,  363   c ; the first and second inspection hole transporting layers  362   a ,  362   b ; and the second inspection key  361   b  may be disposed on the planarization film  250 . 
     In the  FIG. 3  example, the inspection pattern area IPA may be provided between the display area DA and the pad area PA, whereby each of the first to third inspection organic light-emitting layers  363   a ,  363   b ,  363   c ; the first and second inspection hole transporting layers  362   a ,  362   b ; and the second inspection key  361   b  may be overlapped with the data link line  310 . The data link lines  310  may connect the pad  320  of the pad area PA with the data lines of the display area DA. The data link lines  310  may be provided on the gate insulating film  220 , and may be positioned in the same layer as that of the gate electrode  212 , and may be formed of the same material as that of the gate electrode  212 . That is, the data link lines  310  and the gate electrode  212  may be manufactured by the same process. 
     Also, the example of  FIG. 3  shows that the inspection pattern area IPA may be disposed between the display area DA and the pad area PA. For example, the alignment key AK, the first to sixth inspection keys IK 1  to IK 6 , and the first to fifth inspection pixels IP 1  to IP 5  of the inspection pattern area IP 1  may overlap the data link lines  310  for connecting the data lines of the display area DA with the pads PAD of the pad area PA, as shown in the examples of  FIGS. 5 and 6 . 
       FIG. 7  illustrates another example showing a display area, a gate driver, an inspection pattern area, a second electrode, a pad area, and a dam on the first substrate of  FIG. 2 .  FIG. 8  illustrates another example showing a display area, a gate driver, an inspection pattern area, a second electrode, a pad area, and a dam on the first substrate of  FIG. 2 . 
     As shown in the  FIG. 7  example, the pad area PA may be disposed at one side of the first substrate  111 , and the inspection pattern area may be disposed at the opposite side of the first substrate  111 . For example, the inspection pattern area IPA may not be disposed between the pad area PA and the display area DA, whereby the alignment key AK, the first to sixth inspection keys IK 1  to IK 6 , and the first to fifth inspection pixels IP 1  to IP 5  of the inspection pattern area IP 1  may not overlap the data link lines  310 . 
     As shown in the  FIG. 8  example, the inspection pattern area IPA may be disposed between the gate driver  120  and the display area DA, or the inspection pattern area IPA may be disposed at the side, which may be opposite to one side of the first substrate  111  where the gate driver  120  may be provided. For example, the inspection pattern area IPA may overlap the gate lines for connecting the display area DA with the gate driver  120 . Also, the inspection pattern area IPA may not be disposed between the pad area PA and the display area DA, whereby the first to sixth inspection keys IK 1  to IK 6  and the first to fifth inspection pixels IP 1  to IP 5  of the inspection pattern area IPA may not overlap the data link lines  310 . 
       FIG. 9  is a flow chart illustrating a method for manufacturing an OLED device according to an embodiment of the present disclosure.  FIGS. 10A to 10F  are plane views illustrating an open mask and first to fifth fine metal masks (FMMs) disposed on a first substrate. 
     The examples of  FIGS. 10A to 10F  show the first substrate, which may be exposed by openings of an open mask OM and first to fifth FMM FMM 1  to FMM 5 . As shown in the  FIG. 10A  example, the display area DA of the first substrate  111  may not be covered, but may be exposed by the opening of the open mask OM. As shown in the  FIG. 10B  example, the second inspection pixel IP 2  and the first sub-pixels P 1  of the first substrate  111  may not be covered, but may be exposed by the opening of the first FMM FMM 1 . As shown in the  FIG. 10C  example, the fourth inspection pixel IP 4  and the second sub-pixels P 2  of the first substrate  111  may not be covered, but may be exposed by the opening of the second FMM FMM 2 . The first inspection pixel IP 1  and the first sub-pixels P 1  of the first substrate  111  may not be covered, but may be exposed by the opening of the third FMM FMM 3 . The third inspection pixel IP 3  and the second sub-pixels P 2  of the first substrate  111  may not be covered, but may be exposed by the opening of the fourth FMM FMM 4 . The fifth inspection pixel IP 5  and the third sub-pixels P 3  of the first substrate  111  may not be covered, but may be exposed by the opening of the fifth FMM FMM 5 . 
     Hereinafter, a method for manufacturing the OLED device according to an embodiment of the present disclosure will be described in detail with reference to the examples of  FIGS. 9 to 10F . Firstly, the first electrodes  261 , the first to sixth inspection keys IK 1  to IK 6 , and the alignment key AK may be provided on the thin film transistors  210  prepared on the first substrate  111 , and the planarization film  250  for covering the thin film transistors  210 . 
     The first electrode  261  may be connected with the source electrode  213  of the thin film transistor  210  via the contact hole penetrating through the protection film  240  and the planarization film  250 . The first electrodes  261 , the first to sixth inspection keys IK 1  to IK 6 , and the alignment key AK may be formed of a metal material, for example, a deposition structure of aluminum and titanium (Ti/Al/Ti), a deposition structure of aluminum and indium tin oxide (ITO/AL/ITO), an APC alloy, and a deposition structure of APC alloy and indium tin oxide (ITO/APC/ITO). 
     The first to sixth inspection keys IK 1  to IK 6  and the alignment key AK may be positioned in the same layer as that of the first electrode  261 , and may be formed of the same material as that of the first electrode  261 . In this case, the first to sixth inspection keys IK 1  to IK 6  and the alignment key AK may be manufactured at the same time by the process of forming the first electrode  261 , whereby there may be no additional process for forming the first to sixth inspection keys IK 1  to IK 6  and the alignment key AK. 
     Then, the bank  270  may be provided to cover the edge of the first electrode  261  on the planarization film  250  to divide the sub-pixels P 1 , P 2 , P 3 . The bank  270  may be formed of an organic material, for example, acryl resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, etc. See operation S 101  of the example of  FIG. 9 . 
     Secondly, as shown in the  FIG. 10A  example, a first open mask OM having the opening corresponding to the display area DA may be aligned on the first substrate  111 , to thereby form the common hole transporting layer  262   a  in the first to third sub-pixels P 1 , P 2 , P 3  of the display area DA. See operation S 102  of the example of  FIG. 9 . 
     Thirdly, as shown in the  FIG. 10B  example, the first FMM FMM 1  having the opening for the second inspection pixel IP 2  of the inspection pattern area IPA and the first sub-pixels P 1  of the display area DA may be aligned on the first substrate  111 , to thereby form the first hole transporting layer  262   b  in the first sub-pixels P 1  of the display area DA and the second inspection pixel IP 2  of the inspection pattern area IPA. See operation S 103  of the example of  FIG. 9 . 
     Fourthly, as shown in the  FIG. 10C  example, the second FMM FMM 2  having the opening for the fourth inspection pixel IP 4  of the inspection pattern area IPA and the second sub-pixels P 2  of the display area DA may be aligned on the first substrate  111 , to thereby form the second hole transporting layer  262   c  in the second sub-pixels P 2  of the display area DA and the fourth inspection pixel IP 4  of the inspection pattern area IPA. See operation S 104  of the example of  FIG. 9 . 
     Fifthly, as shown in the  FIG. 10D  example, the third FMM FMM 3  having the opening for the first inspection pixel IP 1  of the inspection pattern area IPA and the first sub-pixels P 1  of the display area DA may be aligned on the first substrate  111 , to thereby form the first organic light-emitting layer  263   a  in the first sub-pixels P 1  of the display area DA and the first inspection pixel IP 1  of the inspection pattern area IPA. See operation S 105  of the example of  FIG. 9 . 
     Sixthly, as shown in the  FIG. 10E  example, the fourth FMM FMM 4  having the opening for the third inspection pixel IP 3  of the inspection pattern area IPA and the second sub-pixels P 2  of the display area DA may be aligned on the first substrate  111 , to thereby form the second organic light-emitting layer  263   b  in the second sub-pixels P 2  of the display area DA and the third inspection pixel IP 3  of the inspection pattern area IPA. See operation S 106  of the example of  FIG. 9 . 
     Seventhly, as shown in the  FIG. 10F  example, the fifth FMM FMM 5  having the opening for the fifth inspection pixel IP 5  of the inspection pattern area IPA and the third sub-pixels P 3  of the display area DA may be aligned on the first substrate  111 , to thereby form the third organic light-emitting layer  263   c  in the third sub-pixels P 3  of the display area DA and the fifth inspection pixel IP 5  of the inspection pattern area IPA. See operation S 107  of the example of  FIG. 9 . 
     Eighthly, a second open mask having the opening corresponding to the display area DA may be aligned on the first substrate  111 , to thereby form the electron transporting layer  264  in the first to third sub-pixels P 1 , P 2 , P 3  of the display area DA. Then, the second electrode  265  may be provided on the first to third sub-pixels P 1 , P 2 , P 3  of the display area DA, the first to fifth inspection pixels IP 1  to IP 5  of the inspection pattern area IPA, the first to sixth inspection keys IK 1  to IK 6  of the inspection pattern area IPA, and the alignment key AK of the inspection pattern area IPA. See operation S 108  of the example of  FIG. 9 . Ninthly, the first to fifth inspection pixels IP 1  to IP 5  may be irradiated with ultraviolet (UV) rays, to thereby inspect the alignment of the first to third inspection organic light-emitting layers  363   a ,  363   b ,  363   c , and the first and second hole transporting layers  362   a  and  362   b.    
     Hereinafter, an alignment error calculation method for the first inspection pixel IP 1  will be described in detail with reference to  FIG. 11 . 
       FIG. 11  illustrates an example showing an alignment error calculation method for a first inspection pixel. 
     Firstly, an optimal alignment position OAP for the first inspection pixel IP 1  may be calculated in an inspection equipment by the use of first inspection key IK 1  and second inspection key IK 2 . Also, a deposition position of the first inspection organic light-emitting layer  363   a  may be checked by the inspection equipment. 
     Then, the center coordinates (C(x,y)) of the optimal alignment position OAP and the center coordinates (IP 1 (x,y)) of the first inspection organic light-emitting layer  363   a  may be calculated by the inspection equipment. Also, an alignment error corresponding to the difference between the center coordinates (C(x,y)) of the optimal alignment position OAP and the center coordinates (IP 1 (x,y)) of the first inspection organic light-emitting layer  363   a  may be calculated by the inspection equipment. Then, the first substrate  111  and the third FMM FMM 3  may be aligned in consideration of the alignment error calculated for the deposition process of the first organic light-emitting layer  263   a.    
     An alignment error calculation method for each of the second to fifth inspection pixels IP 2  to IP 5  may be the same as the above alignment error calculation method for the first inspection pixel IP 1 , whereby a detailed description for the alignment error calculation method for each of the second to fifth inspection pixels IP 2  to IP 5  will be omitted. According to the embodiment of the present disclosure, the inspection organic light-emitting layers for the alignment inspection are formed on the non-display area of the first substrate provided with the thin film transistors, whereby it may be possible to omit an inspection substrate, and furthermore, to reduce a manufacturing cost. Also, the inspection hole transporting layers for the alignment inspection may be provided on the non-display area of the first substrate, whereby it may be possible to inspect the alignment of the hole transporting layers as well as the organic light-emitting layers. 
     Also, the first to sixth inspection keys may be provided on the non-display area of the first substrate. For example, the first, third, fourth, fifth, and sixth inspection keys may be provided in the first direction, and the second inspection key may be provided in the second direction crossing to the first direction while being parallel to the first to fifth inspection pixels, whereby it may be possible to inspect the alignment of the inspection organic light-emitting layers of the first to fifth inspection pixels and the alignment for the first direction of the inspection hole transporting layers by the use of first, third, fourth, fifth, and sixth inspection keys, and to inspect the alignment for the second direction by the use of second inspection key. 
     It will be apparent to those skilled in the art that various modifications and variations may be made in the present disclosure without departing from the technical idea or scope of the disclosure. Thus, it may be intended that embodiments of the present disclosure cover the modifications and variations of the disclosure provided they come within the scope of the appended claims and their equivalents.