Patent Publication Number: US-2023157063-A1

Title: Organic Light Emitting Display Apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of the Republic of Korea Patent Application No. 10-2021-0157767 filed on Nov. 16, 2021, which is hereby incorporated by reference in its entirety. 
     BACKGROUND 
     Field of Technology 
     The present disclosure relates to an organic light emitting display apparatus, and more particularly, to an organic light emitting display apparatus that may reduce reflectance due to external light while increasing internal light extraction efficiency. 
     Discussion of the Related Art 
     With the advancement of the information age, attention and demand for a display apparatus for displaying an image have increased in various forms and thus a display field has been rapidly developed. Therefore, various types of flat panel display apparatuses that are lightweight and thin have been developed and spotlighted. Recently, display apparatuses such as a liquid crystal display apparatus and an organic light emitting display apparatus have been used. 
     Since the organic light emitting display apparatus is a self-light emitting display apparatus and displays an image on a display panel through light emission of an organic light emitting layer interposed between two electrodes, it does not require a separate light source such as a backlight unit unlike a liquid crystal display apparatus, thereby capable of being fabricated to be lightweight and thin. Also, since the organic light emitting display apparatus is not only advantageous in view of power consumption due to low voltage driving but also excellent in color implementation, response speed, viewing angle, and contrast ratio, it has been spotlighted as a next-generation display apparatus. 
     The organic light emitting display apparatus displays an image by emitting internal light to the outside of the display apparatus, and studies for increasing efficiency of the internal light are ongoing. However, as reflectance is increased due to external light, it is difficult to improve efficiency of the internal light, whereby studies for deteriorating reflective visibility are also ongoing. 
     SUMMARY 
     The present disclosure has been formed in view of the above problems and it is an object of the present disclosure to provide an organic light emitting display apparatus that may improve light extraction efficiency by emitting light, which may be trapped inside without being emitted to the outside, to the outside when light is emitted from an organic light emitting layer to the outside to display an image. 
     It is another object of the present disclosure to provide an organic light emitting display apparatus that may solve black gap or reflective visibility, which are caused by external light reflection, and may solve Rainbow Mura as incident external light may be prevented from being emitted after being reflected inside or may be prevented from being emitted by increase of reflectance due to a reflective electrode. 
     In addition to the objects of the present disclosure as mentioned above, additional objects and features of the present disclosure will be clearly understood by those skilled in the art from the following description of the present disclosure. 
     In one embodiment, an organic light emitting display apparatus comprises: a subpixel including a light emission area, the subpixel configured to emit light in the light emission area; a planarization layer that overlaps the light emission area, the planarization layer including a plurality of light extraction patterns having a plurality of convex portions and a plurality of concave portions; a light control pattern alternately disposed in the plurality of concave portions of the plurality of light extraction patterns; and a light emitting element disposed on the plurality of light extraction patterns and the light control pattern. 
     In one embodiment, a display apparatus comprises: a substrate including a light emitting area; a subpixel on the substrate, the subpixel including a light emitting element configured to emit light in the light emission area toward the substrate; a planarization layer in the light emitting area, the planarization layer including a plurality of concave portions that extend toward the substrate and overlap the light emitting element; and a light control pattern disposed in a first plurality of concave portions from the plurality of concave portions but is not disposed in a second plurality of concave portions from the plurality of concave portions. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG.  1    is a view illustrating an organic light emitting display apparatus according to one embodiment of the present disclosure; 
         FIG.  2    is a view illustrating a plane structure of a unit pixel according to one embodiment of the present disclosure; 
         FIG.  3    is a cross-sectional view illustrating a sectional structure of one subpixel of  FIG.  2    according to one embodiment of the present disclosure; 
         FIG.  4    is an enlarged plan view illustrating a portion A of  FIG.  2    according to one embodiment of the present disclosure; 
         FIG.  5 A  is a cross-sectional view taken along line I-I′ of  FIG.  4   ,  FIG.  5 B  is a cross-sectional view taken along line II-II′ of  FIG.  4   , and  FIG.  5 C  is a cross-sectional view taken along line III-III′ of  FIG.  4    according to one embodiment of the present disclosure; 
         FIG.  6    is an enlarged plan view illustrating another example of a portion A of  FIG.  2    according to one embodiment of the present disclosure; 
         FIG.  7 A  is a cross-sectional view taken along line IV-IV′ of  FIG.  6   , and  FIG.  7 B  is a cross-sectional view taken along line V-V′ of  FIG.  6    according to one embodiment of the present disclosure; 
         FIG.  8    is a view illustrating an effect of an organic light emitting display apparatus according to one embodiment of the present disclosure; 
         FIG.  9 A  is a photo illustrating a comparative example, and  FIG.  9 B  illustrates simulation data of a comparative example; 
         FIG.  10    illustrates simulation data of an organic light emitting display apparatus according to the embodiments of the present disclosure; and 
         FIG.  11    is a graph illustrating light efficiency of an organic light emitting display apparatus according to the embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following embodiments are provided as an example so that spirits of the present disclosure may be sufficiently transferred to those skilled in the art. Therefore, the present disclosure is not limited to the embodiments described below and may be embodied in other forms. In the drawings, a size and thickness of the apparatus may be exaggerated for convenience. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Also, in the following description, when the detailed description of the relevant known art is determined to unnecessarily obscure the subject matter of the present disclosure, the detailed description will be omitted. 
     In the case in which “comprise,” “have,” and “include” described in the present disclosure are used, another portion may also be present unless “only” is used. The terms in a singular form may include plural forms unless noted to the contrary. 
     In describing a position relationship, for example, when the position relationship is described as ‘upon˜%’, ‘above’, ‘below˜%’, and ‘next to˜’, one or more portions may be arranged between two other portions unless ‘just’ or ‘direct’ is used. Spatially relative terms such as “below”, “beneath”, “lower”, “above”, and “upper” may be used herein to easily describe a relationship of one element or elements to another element or elements as illustrated in the figures. It will be understood that these terms are intended to encompass different orientations of the apparatus in addition to the orientation depicted in the figures. For example, if the apparatus illustrated in the figure is reversed, the apparatus described to be arranged “below”, or “beneath” another apparatus may be arranged “above” another apparatus. Therefore, an exemplary term “below or beneath” may include “below or beneath” and “above” orientations. Likewise, an exemplary term “above” or “on” may include “above” and “below or beneath” orientations. 
     In describing elements of the present disclosure, the terms “first”, “second”, “A”, “B”, “(a)”, “(b)”, etc. may be used. These terms are intended to identify the corresponding elements from the other elements, and basis, order, or number of the corresponding elements are not limited by these terms. 
     Features of various embodiments of the present disclosure may be partially or overall coupled to or combined with each other and may be variously inter-operated with each other and driven technically as those skilled in the art can sufficiently understand. The embodiments of the present disclosure may be carried out independently from each other or may be carried out together in co-dependent relationship. 
     Hereinafter, an organic light emitting display apparatus according to the present disclosure will be described in detail with reference to the accompanying drawings and embodiments.  FIG.  1    is a view illustrating an organic light emitting display apparatus according to one embodiment of the present disclosure. 
     Referring to  FIG.  1   , the organic light emitting display apparatus according to one embodiment of the present disclosure may include a display panel  10  that includes a substrate  100  (e.g., a first substrate) and an opposite substrate  300  (e.g., a second substrate), which are bonded to each other. 
     The substrate  100  includes a thin film transistor, and may be a transparent glass substrate or a transparent plastic substrate. The substrate  100  may include a display area AA and a non-display area IA. 
     The display area AA may be an area where an image is displayed, and may be a pixel array area, an active area, a pixel array unit, a display unit or a screen. The display area AA may include a plurality of pixels P. The plurality of pixels P may be a unit area in which light is actually emitted. 
     The non-display area IA may be an area where an image is not displayed, and may be a peripheral circuit area, a signal supply area, a non-active area or a bezel area. The non-display area IA may be configured to surround the display area AA. The display panel  10  or the substrate  100  may further include a peripheral circuit unit  50  disposed in the non-display area IA. 
     The opposite substrate  300  may be attached to the substrate  100  by an adhesive member (or transparent adhesive), or may be disposed on the substrate  100  in a manner that an organic or inorganic material is stacked on the substrate  100 . The opposite substrate  300  may be an upper substrate, a second substrate or an encapsulation substrate, and may correspond to an element for encapsulating the substrate  100 . 
       FIG.  2    is a view illustrating a plane structure of a unit pixel according to one embodiment of the present disclosure,  FIG.  3    is a cross-sectional view illustrating a sectional structure of one subpixel SP of  FIG.  2    according to one embodiment of the present disclosure, and  FIG.  4    is an enlarged plan view illustrating a portion A of  FIG.  2    according to one embodiment of the present disclosure. 
     Referring to  FIGS.  2  to  4   , the organic light emitting display apparatus according to one embodiment of the present disclosure may include a plurality of unit pixels P, each of which is configured by a plurality of subpixels SP in the display area AA. 
     One subpixel SP may include a pixel area and a circuit area CA. The pixel area may include a light emission area EA. The circuit area CA may be spatially separated from the light emission area EA in the subpixel SP. The light emission area EA is an area defined by the pixel area that is opened by a bank  190  in the subpixel SP, and the circuit area CA may be a non-light emission area or a non-opening area. 
     One unit pixel P may include four subpixels SP in one embodiment. The subpixels SP may include a red pixel, a white pixel, a blue pixel, and a green pixel. A gate line GL is disposed to be extended across the light emission area EA and the circuit area CA of the subpixel SP between the light emission area EA and the circuit area CA. A plurality of data lines DL or reference lines RL are disposed to be extended across adjacent light emission areas EA or adjacent circuit areas CA between the adjacent light emission areas EA or between the adjacent circuit areas CA. A power line VDD extended in a direction parallel with the data line DL is disposed in one unit pixel P. The reference line RL may be used as a sensing line for sensing a characteristic change of a driving thin film transistor disposed in the circuit area CA and/or a characteristic change of a light emitting element layer from the outside during a sensing driving mode of the unit pixel P. 
     As shown in  FIG.  3   , the organic light emitting display apparatus according to the present disclosure may include a substrate  100 , a planarization layer  170  having a light extraction pattern  180 , a light control pattern  175 , a light emitting element EP, and an optical film  120 . The light emitting element EP is driven by a driving thin film transistor Tdr disposed between the substrate  100  and the planarization layer  170 . 
     A buffer layer  110 , the driving thin film transistor Tdr, a protective layer  130 , the planarization layer  170  and the light emitting element EP may be sequentially stacked on a first surface  100   a  of the substrate  100 . The optical film  120  may be disposed on a second surface  100   b  of the substrate  100 . An image is displayed in a direction of the second surface  100   b  of the substrate  100  to which the optical film  120  is attached. For example, the substrate  100  may be disposed in a direction in which light of the light emitting element EP is emitted, and the optical film  120  may be attached to the substrate in the direction in which the light is emitted. 
     The optical film  120  includes a phase film  123  and a polarizing film  125 , and the phase film  123  is disposed between the substrate  100  and the polarizing film  125 . The optical film  120  may be disposed to be attached to the second surface  100   b  of the substrate  100  by an adhesive material (not shown). 
     The polarizing film  125  may be formed in a shape in which a plurality of layers are stacked and attached to the phase film  123 , and may change a direction, through which the light passes, to one direction. For example, the polarizing film  125  may change a phase by 90°. The phase film  123  may change the phase of the light that passes, by 45°. 
     The buffer layer  110  disposed on the first surface  100   a  of the substrate  100  may be disposed on the entire first surface  100   a  of the substrate  100 . The buffer layer  110  may serve to prevent or at least reduce a material contained in the substrate  100  from being diffused into a thin film transistor layer during a high temperature process of a manufacturing process of the thin film transistor or serve to prevent or at least reduce external water or moisture from being permeated into the light emitting element. Optionally, the buffer layer  110  may be comprised of a plurality of layers or omitted, as the case may be. 
     The driving thin film transistor Tdr is disposed in the circuit area CA, and the driving thin film transistor Tdr may include an active layer  111 , a gate insulating layer  113 , a gate electrode  115 , an interlayer insulating layer  117 , a drain electrode  119   d  and a source electrode  119   s . The drain electrode  119   d  and the source electrode  119   s  may be defined to be reversed depending on the type of the driving thin film transistor Tdr. 
     The active layer  111  constituting the driving thin film transistor Tdr may be made of a semiconductor material based on any one of amorphous silicon, polycrystalline silicon, oxide and an organic material, for example. 
     The gate insulating layer  113  may be disposed on a channel area of the active layer  111  in an island shape, or may be fully disposed on the substrate  100  or the buffer layer  110 , which includes the active layer  111 . 
     The interlayer insulating layer  117  may be disposed on the gate electrode  115  and the active layer  111 . The interlayer insulating layer  117  may be fully disposed in the circuit area CA and the light emission area EA. The interlayer insulating layer  117  may be made of an inorganic material, an organic material or a combination thereof. 
     In the circuit area CA, a switching thin film transistor and a capacitor may be further disposed together with the driving thin film transistor Tdr. A light shielding layer  101  may be further disposed below the active layer  111  of at least one of the driving thin film transistor Tdr or the switching thin film transistor on the substrate  100 . 
     The protective layer  130  may be provided on the substrate  100  to cover the driving thin film transistor Tdr. The protective layer  130  covers the drain electrode  119   d  and the source electrode  119   s  of the driving thin film transistor Tdr and the interlayer insulating layer  117 . The protective layer  130  may be fully disposed in the circuit area CA and the light emission area EA. The protective layer  130  may be expressed as terms of a passivation layer. 
     The organic light emitting display apparatus according to the present disclosure may further include a wavelength conversion layer  150  on the first surface  100   a  of the substrate  100 . 
     The wavelength conversion layer  150  may be disposed between the substrate  100  and the planarization layer  170  to overlap the at least one light emission area EA. The wavelength conversion layer  150  may be disposed between the protective layer  130  and the planarization layer  170  to overlap the light emission area EA. The wavelength conversion layer  150  according to another example may be disposed between the interlayer insulating layer  117  and the protective layer  130  or between the substrate  100  and the interlayer insulating layer  117  to overlap the light emission area EA. 
     The wavelength conversion layer  150  may have a size wider than that of the light emission area EA. Since the wavelength conversion layer  150  is wider than the light emission area EA, the wavelength conversion layer  150  may have a size wider than that of the light extraction pattern  180  of the planarization layer  170 . When the wavelength conversion layer  150  has a size wider than that of the light extraction pattern  180 , leakage of internal light to an adjacent subpixel SP may be reduced. 
     The wavelength conversion layer  150  includes a color filter that transmits a specific wavelength of light of a color set to a subpixel SP among light emitted from the light emitting element EP toward the substrate  100 . The wavelength conversion layer  150  may transmit a red, green, or blue wavelength. In the organic light emitting display apparatus according to the present disclosure, when one unit pixel P is comprised of first to fourth subpixels SP adjacent to one another, the wavelength conversion layer  150  provided in the first subpixel may include a red color filter, the wavelength conversion layer  150  provided in the second subpixel may include a green color filter, and the wavelength conversion layer  150  provided in the third subpixel may include a blue color filter. The fourth subpixel may emit white light because the wavelength conversion layer  150  is not disposed in the fourth subpixel. 
     The planarization layer  170  may be provided on the substrate  100  to cover the protective layer  130 . When the protective layer  130  is omitted, the planarization layer  170  may be provided on the substrate  100  to cover the driving thin film transistor Tdr, the wavelength conversion layer  150  and various lines. The planarization layer  170  may be fully disposed in the circuit area CA and the light emission area EA. In addition, the planarization layer  170  may be disposed on the entire display area AA shown in  FIG.  1   . The planarization layer  170  may be disposed to reach the non-display area with a size relatively wider than that of the display area AA. 
     The planarization layer  170  may be disposed to be relatively thick, thereby providing a flat surface on the display area AA. The planarization layer  170  may be made of an organic material such as photo acryl, benzocyclobutene, polyimide and fluorine resin. 
     The planarization layer  170  may include a light extraction pattern  180  disposed in the pixel area PA. The light extraction pattern  180  may be disposed on an upper surface  170   a  of the planarization layer  170  to overlap the light emission area EA of the pixel area. The light extraction pattern  180  is formed on the planarization layer  170  of the light emission area EA to have a curved (or uneven) shape, thereby changing a moving path of the light emitted from the light emitting element EP to increase light extraction efficiency. 
     The light extraction pattern  180  includes a plurality of concave portions  181  and a plurality of convex portions  183  between the plurality of concave portions  181 , and the convex portions  183  and the concave portions  181  are alternately disposed and extend from each other. The plurality of concave portions  181  of the light extraction pattern  180  are concave based on the upper surface  170   a  of the planarization layer  170 , but a plurality of convex surfaces may be disposed to be connected in the form of a lens in a direction toward the substrate  100 . The plurality of concave portions  181  may have the same depth based on the upper surface  170   a  of the planarization layer  170 , but some of the plurality of concave portions  181  may have different depths. As shown in  FIG.  3   , the concave portions  181  are disposed through a thickness of the planarization layer  170 , but not through the entire thickness of the planarization layer  170 . 
     The light extraction pattern  180  may have a size wider than that of the light emission area EA of the subpixel SP. When the light extraction pattern  180  has a size wider than that of the light emission area EA, light efficiency in the light emission area EA may be further increased. The light extraction pattern  180  may be an uneven pattern, a micro lens or a light scattering pattern. 
     Referring to  FIGS.  4  to  5 C , each of the plurality of concave portions  181  of the organic light emitting display apparatus according to one embodiment (Embodiment 1) may be disposed at every interval of the light extraction pattern  180  in parallel along a first direction X, and may be disposed at every interval of the light extraction pattern  180  along a second direction Y. The light extraction pattern  180  may be disposed at a predetermined interval. Each of the plurality of concave portions  181  may be disposed in a grid shape having a predetermined interval. The adjacent concave portions  181  disposed along the first direction X may be connected to each other in a straight line, and the adjacent concave portions  181  disposed along the second direction Y may be connected to each other in a straight line. 
     A central portion of each of the four adjacent concave portions  181  may be aligned to form a square shape SS. Also, each of the plurality of concave portions  181  may be surrounded by eight concave portions  181  disposed therearound, and at this time, a shape that the central portions of the four adjacent concave portions  181  are sequentially connected may form a planar square shape. Although the concave portion  181  shown in the present disclosure has a planar outer appearance of a circle structure, an outer periphery of each of the plurality of concave portions  181  may be disposed or arranged in a honeycomb structure or a circle structure. 
     Pitches (or intervals) between the concave portions  181  respectively disposed in the plurality of subpixels SP may be the same as or different from each other. In this case, the pitch between the concave portions  181  may be a distance (or interval) between central portions of two adjacent concave portions  181 . 
     The convex portion  183  may be provided in the planarization layer  170 , which overlaps the light emission area EA, to have a shape that may maximize (e.g., increase) external extraction efficiency of light generated in the subpixel SP based on an effective light emission area of the light emitting element EP. 
     The convex portion  183  may change a moving path of the light emitted from the light emitting element EP toward a light emitting surface. According to one embodiment of the present disclosure, the convex portion  183  changes the moving path of the light emitted from the light emitting element EP toward the substrate  100  to prevent or at least reduce the light emitted from the light emitting element EP from being trapped therein, thereby emitting the light to the outside and thus increasing light extraction efficiency. 
     The convex portions  183  may be implemented to surround each of the plurality of concave portions  181 . The plurality of convex portions  183  surrounding one concave portion  181  may be connected to have a honeycomb shape. 
     The convex portions  183  may be formed to be connected to each other between the plurality of concave portions  181 . An upper portion of the convex portion  183  may include a dome or bell structure having a convex cross-sectional shape as shown in  FIGS.  5 A to  5 C , but is not limited thereto. An inclined portion between the convex portion  183  and the concave portion  181  may have a curved shape. The inclined portion between the convex portion  183  and the concave portion  181  may have a tangent slope that is gradually increased from the bottom of the concave portion  181  to the upper portion of the convex portion  183  and gradually reduced. 
     As shown in  FIG.  3   , the light control pattern  175  is disposed on the light extraction pattern  180  of the planarization layer  170 , and is disposed in the concave portion  181  of the light extraction pattern  180 . The light control pattern  175  is disposed in a plural number to alternately planarize an upper surface of the concave portion  181  by alternately filling the concave portions  181  of the light extraction pattern  180 . Thus, a subset of the concave portions  181  are filled with the light control pattern  175 . The light control pattern  175  is made of an organic material having a refractive index higher than that of the planarization layer  170 . The refractive index of the light control pattern  175  may be 1.57 or more. The light control pattern  175  may be made of a transparent material, and may have transmittance of 90% or more. The light control pattern  175  may include particles. The light control pattern  175  may control straight directionality of light by refracting internal light. 
     As shown in  FIG.  4   , the light control patterns  175  may be alternately disposed in adjacent concave portions  181  of the light extraction pattern  180  so that the light control patterns  175  may be spaced apart from each other in at least one direction. For example, two light control patterns  175  are spaced apart from each other with the convex portion  183 , the concave portion  181  and the convex portion  183  of the light extraction pattern  180 , which are interposed therebetween, in at least one direction. 
     The central portions of four adjacent concave portions  181  may be connected (e.g., aligned) to each other to form a square shape SS as shown in  FIG.  4   , and both corners connected by a line of the square shape SS have their respective structures different from each other, and both corners that are not connected to each other by the line have the same symmetrical structure. 
     The light control pattern  175  is disposed in one of the concave portions  181  of both corners, which are connected in a straight line in the square shape SS and face each other, but is not disposed in another concave portion  181 . The light control pattern  175  is disposed on both concave portions  181  of both corners facing each other based on a diagonal direction in the square shape SS, or the light control pattern  175  is not disposed on both concave portions  181  of both corners facing each other based on a diagonal direction opposite to the diagonal direction. In this case, the light control pattern  175  may be alternately disposed in the concave portion  181  of the light extraction pattern  180 . 
     As shown in  FIGS.  5 A to  5 C , the light control pattern  175  fills the concave portion  181  between the two convex portions  183  of the light extraction pattern  180  in the first direction X to planarize the concave portion  181 , but is not disposed in the concave portion  181  immediately adjacent to the concave portion  181  filled by the light control pattern  175 . For example, the light control pattern  175  disposed in one row in the first direction X is not overlapped with the light control pattern  175  disposed in next row or adjacent row in the first direction X. The concave portion  181  of one row filled with the light control pattern  175  in the first direction X is disposed to overlap the concave portion  181  of next row or adjacent row that is not filled with the light control pattern  175  in the first direction X. 
     As shown in  FIGS.  5 A to  5 C , the light control pattern  175  fills the concave portion  181  between the two convex portions  183  of the light extraction pattern  180  in the second direction Y to planarize the concave portion  181 , but is not disposed in the concave portion  181  immediately adjacent to the concave portion  181  filled by the light control pattern. For example, the light control pattern  175  disposed in one column in the second direction Y does not overlap (e.g., non-overlapping) the light control pattern  175  disposed in next column or adjacent column in the second direction Y. The concave portion  181  of one column filled with the light control pattern  175  in the second direction Y is disposed to overlap the concave portion  181  of next column or adjacent column that is not filled with the light control pattern  175  in the second direction Y. 
     When the concave portions  181  of the four adjacent light extraction patterns  180  are symmetrical to each other based on the diagonal direction, the light control pattern  175  is disposed in the concave portions  181  in one diagonal direction, and is not disposed in the concave portions  181  in the other diagonal direction. In this case, the light control pattern  175  may be alternately disposed in the concave portion  181  of the light extraction pattern  180 . 
       FIG.  6    is a plan view illustrating another embodiment. Referring to  FIGS.  6 ,  7 A , and  7 B, a planarization layer  270  of the organic light emitting display apparatus according to another embodiment (Embodiment 2) of the present disclosure may include a light extraction pattern  280  disposed in the pixel area in accordance with another embodiment of the present disclosure. The light extraction pattern  280  is disposed to overlap the light emission area EA of the pixel area to change the moving path of the light emitted from the light emitting element EP, thereby increasing light extraction efficiency. 
     The light extraction pattern  280  includes a plurality of concave portions  281  and a plurality of convex portions  283  between the plurality of concave portions  281 . The plurality of convex portions  283  and the plurality of concave portions  281  are alternately disposed to be connected to each other. The plurality of concave portions  281  may have the same depth based on the upper surface of the planarization layer  270 , but some of the plurality of concave portions  281  may have different depths. 
     The light extraction pattern  280  may have a size wider than that of the light emission area EA of the subpixel SP. When the light extraction pattern  280  has a size wider than that of the light emission area EA, light efficiency in the light emission area EA may be further increased. The light extraction pattern  280  may be an uneven pattern, a micro lens or a light scattering pattern. 
     The plurality of concave portions  281  may be spaced apart from each other in parallel along the first direction X to have a predetermined gap therebetween, and may be disposed at every interval of the light extraction pattern  280  along the second direction Y. The light extraction pattern  280  may be disposed at a predetermined interval. Each of the plurality of concave portions  281  may be disposed in a rhombus or diamond shape (DS), which has a predetermined interval. The adjacent concave portions  281  disposed along the second direction Y may be connected to each other in a zigzag shape, and the adjacent concave portions  281  disposed along the first direction X may be connected to each other in a straight line. 
     A central portion of each of four adjacent concave portions  281  may form a square shape or a rhombus or diamond shape DS. Also, each of the plurality of concave portions  281  may be surrounded by the concave portion  281  of six light extraction patterns  280  disposed therearound. At this time, a central portion of each of six concave portions  281  surrounding one concave portion  281  may have a planar hexagonal shape. Although the light extraction pattern  280  of an external appearance of the concave portion  281  shown in the present disclosure is shown in a circle structure, the outer periphery of the light extraction pattern  280  of each of the plurality of concave portions  281  may be disposed or arranged in a honeycomb structure or a circle structure. 
     Pitches (or intervals) between the concave portions  281  respectively disposed in the plurality of subpixels SP may be the same as or different from each other. In this case, the pitch between the concave portions  281  may be a distance (or interval) between central portions of two adjacent concave portions  281 . 
     The convex portion  283  may be provided in the planarization layer  270 , which overlaps the light emission area EA, to have a shape that may maximize external extraction efficiency of light generated in the subpixel SP based on an effective light emission area of the light emitting element EP. 
     The convex portion  283  may change a moving path of the light emitted from the light emitting element EP toward a light emitting surface. According to one embodiment of the present disclosure, the convex portion  283  changes the moving path of the light emitted from the light emitting element EP toward the substrate  100  to prevent the light emitted from the light emitting element EP from being trapped therein, thereby emitting the light to the outside and thus increasing light extraction efficiency. 
     The plurality of convex portions  283  may be implemented to surround each of the plurality of concave portions  281 . The plurality of convex portions  183  surrounding one concave portion  281  may be connected to have a honeycomb shape. 
     The convex portions  283  may be formed to be connected to each other between the plurality of concave portions  281 . An upper portion of the convex portion  283  may include a dome or bell structure having a convex cross-sectional shape as shown in  FIGS.  7 A and  7 B , but is not limited thereto. An inclined portion between the convex portion  283  and the concave portion  281  may have a curved shape. The inclined portion between the convex portion  283  and the concave portion  281  may have a tangent slope that is gradually increased from the bottom of the concave portion  281  to the upper portion of the convex portion  283  and gradually reduced. 
     The light control pattern  275  is disposed on the light extraction pattern  280  of the planarization layer  270 , and is disposed in the concave portion  281  of the light extraction pattern  280 . The light control pattern  275  is disposed in a plural number to alternately planarize the concave portion  281  by alternately filling the concave portion  281  of the light extraction pattern  280 . The light control pattern  275  is made of an organic material having a refractive index higher than that of the planarization layer  270 . The refractive index of the light control pattern  275  may be 1.57 or more. The light control pattern  275  may be made of a transparent material, and may have transmittance of 90% or more. The light control pattern  275  may include particles. The light control pattern  275  may control straight directionality of light by refracting internal light. 
     As shown in  FIG.  6   , the light control patterns  275  are alternately disposed in adjacent concave portions  281  of the light extraction pattern  280 , which are adjacent to each other in at least one direction, so that the light control patterns  275  are spaced apart from each other in at least one direction. For example, two light control patterns  275  are spaced apart from each other with the convex portion  283 , the concave portion  281  and the convex portion  283  of the light extraction pattern  280 , which are interposed therebetween, in at least one direction. 
     The central portions of four adjacent concave portions  281  may be connected to each other to form a rhombus shape DS or diamond shape, and both corners connected by a line of the rhombus shape DS have their respective structures different from each other, and both corners that are not connected to each other by the line have the same symmetrical structure. 
     The light control pattern  275  is disposed in one of the concave portions  281  of both corners, which are connected in a line in the rhombus shape DS and face each other, but is not disposed in the other concave portion  281 . The light control pattern  275  is disposed on the concave portions  281  of both corners facing each other based on a diagonal direction in the rhombus shape DS, and the light control pattern  275  is not disposed on the concave portions  281  of both corners facing each other based on a diagonal direction opposite to the diagonal direction. In this case, the light control pattern  275  may be alternately disposed in the concave portion  281  of the light extraction pattern  280 . 
     The light control pattern  275  fills the concave portion  281  between the two convex portions  283  of the light extraction pattern  280  in the first direction X to planarize the concave portion  281 , but is not disposed in the concave portion  281  immediately adjacent to the concave portion  281  filled by the light control pattern  275 . At this time, as shown in  FIG.  6   , for example, the light control pattern  275  disposed in one row in the first direction X is at least partially overlapped with the light control pattern  275  disposed in next row or adjacent row in the first direction X. The concave portion  281  of one row filled with the light control pattern  275  in the first direction X is disposed to at least partially overlap the concave portion  281  of next row or adjacent row that is not filled with the light control pattern  275  in the first direction X. 
     As shown in  FIG.  7 B , the light control pattern  275  fills the concave portion  281  between the two convex portions  283  of the light extraction pattern  280  in the second direction Y to planarize the concave portion  281 , but is not disposed in the concave portion  281  immediately adjacent to the concave portion  281  filled by the light control pattern  275 . At this time, as shown in  FIG.  6   , for example, at least a portion of the light control pattern  275  disposed in one column in the second direction Y does not overlap (e.g., is non-overlapping) the light control pattern  275  disposed in next column or adjacent column in the second direction Y. At least a portion of the concave portion  281  of one column filled with the light control pattern  275  in the second direction Y is disposed to overlap the concave portion  281  of next column or adjacent column that is not filled with the light control pattern  275  in the second direction Y. 
     When the concave portions  281  of the four adjacent light extraction patterns  280  are symmetrical to each other based on the diagonal direction, the light control pattern  275  is disposed in the concave portions  281  in one diagonal direction, and is not disposed in the concave portions  281  in the other diagonal direction. In this case, the light control pattern  275  may be alternately disposed in the concave portion  281  of the light extraction pattern  280 . 
     As shown in  FIG.  3   , the light emitting element EP may be disposed on the light extraction pattern  180  of the light emission area EA and emit light toward the substrate  100  in accordance with a bottom emission method. The light emitting element EP is disposed along a surface shape (or morphology) of the light extraction pattern  180  and the light control pattern  175 , so that the light emitting element EP is disposed on the inclined portion of the light extraction pattern  180  while having a concave shape in the concave portion  181  of the light extraction pattern  180  in which the light control pattern  175  is not disposed, and has a cross-sectional structure of a flat upper surface in the concave portion  181  of the light extraction pattern  180  in which the light control pattern  175  is disposed. The light emitting element EP alternatively has a concave shape or a curved shape and a flat shape in accordance with the arrangement structure of the light control pattern  175 . 
     The light emitting element EP according to one example may include a first electrode E 1 , a light emitting element layer EDL, and a second electrode E 2 . The light emitting element EP is equally applied to the embodiment of  FIGS.  6 ,  7 A, and  7     b , which illustrate another embodiment, and thus its detailed description will be omitted. The light emitting element EP will be replaced with the following description. 
     The first electrode E 1  may be disposed on the planarization layer  170  on the pixel area and thus be electrically connected to the drain electrode  119   d  of the driving thin film transistor Tdr. One end of the first electrode E 1  adjacent to the circuit area CA may be electrically connected to the drain electrode  119   d  of the driving thin film transistor Tdr through an electrode contact hole CH provided in the planarization layer  170  and the protective layer  130 . 
     Since the first electrode E 1  is directly in contact with the light extraction pattern  180  and the light control pattern  175 , the first electrode E 1  has a shape that follows the shape of the light extraction pattern  180  and the light control pattern  175 . That is, the surface shape of the first electrode E 1  substantially matches the shape of the light extraction pattern  180  and the light control pattern  175 . Since the first electrode E 1  is disposed (or deposited) on the planarization layer  170  and the light control pattern  175  to have a thickness that is relatively thin, the first electrode E 1  may have a morphology (or second morphology) that follows the morphology (or first morphology) of the light control pattern  175  and the light extraction pattern  180  including the convex portion  183  and the plurality of concave portions  181 . 
     The first electrode E 1  is disposed in a shape that follows the surface shape (or morphology) of the light extraction pattern  180  and the light control pattern  175  by a deposition process of a transparent conductive material, so that the first electrode E 1  follows a concave shape in the concave portion  181  of the light extraction pattern  180  in which the light control pattern  175  is not disposed, and has a flat cross-sectional structure in the concave portion  181  of the light extraction pattern  180  in which the light control pattern  175  is disposed. The first electrode E 1  alternately has a concave shape and a flat shape in accordance with the arrangement structure of the light control pattern  175 . That is, the first electrode includes a plurality of portions that are disposed within the concave portions  181 / 281  that lack the light control pattern  175 , and a plurality of portions that are not disposed within the concave portions  181 / 281  that are filled with the light control pattern  175 . 
     The light emitting element layer EDL may be disposed on the first electrode E 1  and thus be directly in contact with the first electrode E 1 . The light emitting element layer EDL may be disposed (or deposited) on the first electrode E 1  to be relatively thicker than the first electrode E 1  so that the light emitting element layer EDL may have a morphology that is different from that of each of the convex portions  183  and the plurality of concave portions  181 , and may have a morphology that follows that of the first electrode E 1 . 
     The light emitting element layer EDL may be disposed by a deposition process to follow the surface shape (or morphology) of the first electrode E 1 , so that the light emitting element layer EDL follows a concave shape in the concave portion  181  of the light extraction pattern  180  in which the light control pattern  175  is not disposed, and has a flat shaped cross-sectional structure in the concave portion  181  of the light extraction pattern  180  in which the light control pattern  175  is disposed. That is, the surface shape of the light emitting element layer EDL substantially matches the shape of the light extraction pattern  180  and the light control pattern  175 . The light emitting element layer EDL alternately has a concave shape and a flat shape in accordance with the arrangement structure of the light control pattern  175 . The light emitting element layer EDL may be disposed by a deposition process to have a non-conformal shape that does not follow the surface shape (or morphology) of the first electrode E 1 , thereby having a cross-sectional structure different from that of the first electrode E 1 . That is, the light emitting element layer EDL includes a plurality of portions that are disposed within the concave portions  181 / 281  that lack the light control pattern  175 , and a plurality of portions that are not disposed within the concave portions  181 / 281  that are filled with the light control pattern  175 . 
     The light emitting element layer EDL may be disposed to have a thickness that is gradually thick toward the bottom surface of the concave portion  181  in which the light control pattern  175  is not disposed. The light emitting element layer EDL may be disposed on the inclined portion of the light extraction pattern  180 , in which the light control pattern  175  is not disposed, at a first thickness, and may be disposed on the bottom surface of the concave portion  181 , in which the light control pattern  175  is not disposed, at a second thickness thicker than the first thickness. The light emitting element layer EDL may be disposed above the concave portion  181  of the light extraction pattern  180 , in which the light control pattern  175  is disposed, at a third thickness, and the second thickness on the bottom surface of the concave portion  181  in which the light control pattern  175  is not disposed and the third thickness may be the same as each other. The first thickness of the light emitting element layer EDL disposed on the inclined portion of the light extraction pattern  180  in which the light control pattern  175  is not disposed may be smaller than the third thickness above the concave portion  181  of the light extraction pattern  180  in which the light control pattern  175  is disposed. 
     The light emitting element layer EDL includes two or more light emitting layers for emitting white light. As an example, the light emitting element layer EDL may include first and second light emitting layers for emitting white light by mixing first light with second light. The first light emitting layer may include any one of a blue light emitting layer, a green light emitting layer, a red light emitting layer, a yellow light emitting layer and a yellow-green light emitting layer to emit the first light. The second light emitting layer may include a light emitting layer for emitting the second light to implement white light from the light emitting element EP by mixture with the first light among the blue light emitting layer, the green light emitting layer, the red light emitting layer, the yellow light emitting layer and the yellow-green light emitting layer. The light emitting element layer EDL according to another example may include any one of a blue light emitting layer, a green light emitting layer and a red light emitting layer. 
     The second electrode E 2  may be disposed on the light emitting element layer EDL and thus be directly in contact with the light emitting element layer EDL. The second electrode E 2  may have a surface shape that follows the surface shape of the light emitting element layer EDL. The second electrode E 2  may be disposed by a deposition process in a conformal shape that follows the surface shape (or morphology) of the light emitting element layer EDL to have the same cross-sectional structure as that of the light emitting element layer EDL. 
     The second electrode E 2  has a shape that follows a concave shape in the concave portion  181  of the light extraction pattern  180  in which the light control pattern  175  is not disposed and has a flat shaped cross-sectional structure in the concave portion  181  of the light extraction pattern  180  in which the light control pattern  175  is disposed. That is, the surface shape of the second electrode E 2  substantially matches the surface shape of the light extraction pattern  180  and the light control pattern  175 . The second electrode E 2  alternately has a concave shape and a flat shape in accordance with the arrangement structure of the light control pattern  175 . That is, the second electrode E 2  includes a plurality of portions that are disposed within the concave portions  181 / 281  that lack the light control pattern  175 , and a plurality of portions that are not disposed within the concave portions  181 / 281  that are filled with the light control pattern  175 . 
     Since the second electrode E 2  is disposed on the inclined portion of the light extraction pattern  180  in which the light control pattern  175  is not disposed, and is disposed on the upper surface of the light control pattern  175  filled in the concave portion  181  of the adjacent light extraction pattern  180 , the light emitted from the light emitting element layer EDL may be reflected by the second electrode E 2  disposed on the inclined portion of the light extraction pattern  180 , in which the light control pattern  175  is not disposed, without being dissipated after moving to next even though it is refracted by the light control pattern  175 . 
     The organic light emitting display apparatus according to the present disclosure has a light control pattern  175  alternately disposed in the concave portion  181  of the light extraction pattern  180 , so that the second electrode E 2  is disposed on the inclined portion of the light extraction pattern  180  to prevent the light emitted from the inside from being dissipated or trapped after moving to next and emit the light to the outside after being reflected inside, thereby increasing condensing efficiency to improve light extraction efficiency. 
     In addition, the organic light emitting display apparatus according to the present disclosure has a light control pattern  175  alternately disposed in the concave portion  181  of the light extraction pattern  180 , so that the second electrode E 2  is disposed on the inclined portion of the light extraction pattern  180  to have a slope and disposed on the concave portion  181  to alternately have a flat surface. 
     Since the second electrode E 2  is sequentially disposed on the inclined portion of the light extraction pattern  180 , the upper surface of the light control pattern  175  on the concave portion  181  and the inclined portion of the adjacent light extraction pattern  180 , the incident external light may be reflected three times from the inclined portion of the light extraction pattern  180 , the upper surface of the light control pattern  175  on the concave portion  181  and the inclined portion of the adjacent light extraction pattern  180 . 
     When the external light incident by the second electrode E 2  is reflected inside three times, since the light may be prevented from being again emitted to the outside, the organic light emitting display apparatus according to the present disclosure may solve reflective visibility due to the external light. Therefore, the organic light emitting display apparatus may prevent or at least reduce black gap due to reflection of the external light, whereby real black may be implemented in a non-driving or off-state. 
     Since the organic light emitting display apparatus according to the present disclosure may prevent the external light from being again emitted to the outside, Rainbow Mura, which is generated as the external light is refracted while being emitted, may be avoided. 
     The second electrode E 2  may include a metal material having high reflectance to reflect the incident light emitted from the light emitting element layer EDL toward the substrate  100 . For example, the second electrode E 2  may include a single layered structure or a multi-layered structure, which is made of any one material or an alloy of two or more materials selected from aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), magnesium (Mg), calcium (Ca) and barium (B a). The second electrode E 2  may include an opaque conductive material having high reflectance. 
     The organic light emitting display apparatus further includes a bank layer  190  for defining the light emission area EA and an encapsulation portion  200  for protecting the light emitting element EP. 
     The bank layer  190  may be disposed on the edge of the first electrode E 1  and on the planarization layer  170 . The bank layer  190  may overlap an edge portion of the wavelength conversion layer  150 . The bank layer  190  may be made of an organic material such as benzocyclobutene(BCB)-based resin, acrylic resin or polyimide resin. The bank layer  190  may be disposed as a photoresist that includes a black pigment, and in this case, the bank layer  190  may serve as a light shielding member between adjacent pixels. 
     The bank layer  190  is disposed on the upper surface  170   a  of the planarization layer  170  to cover the edge of the first electrode E 1  extended onto the circuit area CA, and may be disposed to cover the edge of the light extraction pattern  180 . The light emission area EA defined by the bank layer  190  may be disposed to have a size narrower than an area of the light extraction pattern  180  of the planarization layer  170 . 
     The encapsulation portion  200  may be disposed on the substrate  100  to cover the light emitting element EP. The encapsulation portion  200  may surround the display area. The encapsulation portion  200  may serve to protect the thin film transistor and the light emitting element EP from external impact and prevent oxygen and/or moisture from being permeated into the light emitting element EP. 
     The encapsulation portion  200  may include a plurality of inorganic encapsulation layers. The encapsulation portion  200  may further include at least one organic encapsulation layer interposed between the plurality of inorganic encapsulation layers. The organic encapsulation layer may be represented by a particle cover layer. 
     The encapsulation portion according to another embodiment of the present disclosure may be changed to a filler surrounding the display area, and in this case, the opposite substrate  300  may be bonded to the substrate  100  via the filler. The filler may include a getter material that absorbs oxygen and/or moisture. 
     The opposite substrate  300  may be coupled to the encapsulation portion  200 . The opposite substrate  300  may be made of a plastic material, a glass material or a metal material. For example, when the encapsulation portion  200  includes a plurality of inorganic encapsulation layers, the opposite substrate  300  may be omitted. 
     Optionally, when the encapsulation portion  200  is changed to the filler, the opposite substrate  300  may be coupled to the filler, and in this case, the opposite substrate  300  may be made of a plastic material, a glass material or a metal material. 
       FIG.  8    is a view illustrating an effect of an organic light emitting display apparatus according to one embodiment of the present disclosure. 
     When the external light enters the organic light emitting display apparatus from the outside of the organic light emitting display apparatus, the external light is changed to left circularly polarized light or right circularly polarized light through the optical film  120  which includes the phase film  123  and the polarizing film  125 . In detail, the external light is changed into linear polarized light while passing through the polarizing film  125 , and the linearly polarized light is changed to the left circularly polarized light or the right circularly polarized light while passing through the phase film  123 . 
     First of all, the left circularly polarized light will be described. The first left circularly polarized light is reflected by the second electrode E 2  disposed on the inclined portions of the light extraction patterns  180  and  280 , in which the light control patterns  175  and  275  are not disposed, and is changed to the first right circularly polarized light. The first right circularly polarized light is refracted by the light control patterns  175  and  275  disposed in the concave portions  181  and  281  of the light extraction patterns  180  and  280  and is again reflected by the flat second electrode E 2  on the light control patterns  175  and  275  toward the light emitting element EP, whereby the first right circularly polarized light is changed to the second left circularly polarized light. 
     At this time, since the light control patterns  175  and  275  have a refractive index greater than that of the planarization layers  170  and  270  having the light extraction patterns  180  and  280 , an emission angle θ 2  is smaller than an incident angle θ 1 . Therefore, the first right circularly polarized light is directed in the direction of the light emitting element EP by the second electrode E 2  disposed on the inclined portions of the light extraction patterns  180  and  280  in which the light control patterns  175  and  275  are not disposed. The first right circularly polarized light is again reflected by the flat second electrode E 2  on the light control patterns  175  and  275  and changed to the second left circularly polarized light. 
     The second left circularly polarized light is again refracted by the light control patterns  175  and  275  and reflected by the second electrode E 2  disposed on the inclined portions of the adjacent light extraction patterns  180  and  280  as the light control patterns  175  and  275  are not disposed in the adjacent light extraction patterns  180  and  280 , whereby the second left circularly polarized light is changed to the second right circularly polarized light and directed toward the substrate  100 . 
     At this time, since the light control patterns  175  and  275  have a refractive index greater than that of the planarization layers  170  and  270  having the light extraction patterns  180  and  280 , an emission angle θ 2 ′ is greater than an incident angle θ 1 ′ when the light in the light control patterns  175  and  275  passes through the adjacent light extraction patterns  180  and  280 , whereby the second left circularly polarized light may be directed toward the inclined portions of the adjacent light extraction patterns  180  and  280 , and may be reflected by the second electrode E 2  because the light control patterns  175  and  275  are not disposed in the adjacent light extraction patterns  180  and  280 . 
     The second left circularly polarized light is reflected by the second electrode E 2  and changed to the second right circularly polarized light, and a phase of the light directed toward the substrate  100  by second right circularly polarization is changed to 90° so that the light may be prevented from being emitted to the outside by the polarizing film  125 . 
     As another example, the case that the external light is changed to the linearly polarized light while passing through the polarizing film  125  and the linearly polarized light is changed to the right circularly polarized light while passing through the phase film  123  will be described. The first right circularly polarized light is reflected by the second electrode E 2  disposed on the inclined portions of the light extraction patterns  180  and  280  in which the light control patterns  175  and  275  are not disposed, and is changed to the first left circularly polarized light. The first left circularly polarized light is refracted by the light control patterns  175  and  275  disposed on the concave portions  181  and  281  of the light extraction patterns  180  and  280 , is again reflected by the flat second electrode E 2  on the light control patterns  175  and  275  toward the light emitting element EP, and then is changed to the second right circularly polarized light. 
     At this time, since the light control patterns  175  and  275  have a refractive index greater than that of the planarization layers  170  and  270  having the light extraction patterns  180  and  280 , the emission angle θ 2  is smaller than the incident angle θ 1 , whereby the first left circularly polarized light is directed toward the light emitting element EP by the second electrode E 2  disposed on the inclined portions of the light extraction patterns  180  and  280  in which the light control patterns  175  and  275  are not disposed. The first left circularly polarized light is again reflected by the flat second electrode E 2  on the light control patterns  175  and  275  and changed to the second right circularly polarized light. 
     The second right circularly polarized light is again refracted by the light control patterns  175  and  275 , is again reflected by the second electrode E 2  disposed on the inclined portion of the adjacent light extraction patterns  180  because the light control patterns  175  and  275  are not disposed in the adjacent light extraction patterns  180  and  280 , is changed to the second left circularly polarized light, and is directed toward the substrate  100 . 
     At this time, since the light control patterns  175  and  275  have a refractive index greater than that of the planarization layers  170  and  270  having the light extraction patterns  180  and  280 , the emission angle θ 2 ′ is greater than the incident angle θ 1 ′ when the light in the light control patterns  175  and  275  passes through the adjacent light extraction patterns  180  and  280 , whereby the second right circularly polarized light may be directed toward the inclined portions of the adjacent light extraction patterns  180  and  280 , and may be reflected by the second electrode E 2  because the light control patterns  175  and  275  are not disposed in the adjacent light extraction patterns  180  and  280 . 
     The second right circularly polarized light is again reflected by the second electrode E 2  and changed to the second left circularly polarized light, and a phase of the light directed toward the substrate  100  by second left circularly polarization is changed to 0° by the phase film  123 , whereby the light may be prevented from being emitted to the outside by the polarizing film  125 . 
     As described above, in the organic light emitting display apparatus according to the present disclosure, the incident light and the emission light of the external light have their respective phases different from or opposite to each other, so that the external light does not pass the display apparatus by the optical film  120  having the polarized film  125 , thereby preventing or at least reducing the external light from being emitted. 
     In the organic light emitting display apparatus according to the present disclosure, the light control patterns  175  and  275  are alternately disposed in the concave parts  181  and  281  of the light extraction patterns  180  and  280 , so that the incident external light is reflected inside three times by the second electrode E 2  and prevented from being emitted, whereby reflective visibility due to the external light may be solved. Therefore, the organic light emitting display apparatus may prevent black gap due to reflection of the external light from occurring, thereby implementing real black in a non-driving or off-state. 
     The light emitted from the light emitting element EP in the organic light emitting display apparatus is emitted toward the substrate  100  or refracted by the light control patterns  175  and  275  filled in the concave portions  181  and  281  of the light extraction patterns  180  and  280 , and the refracted light is directed toward the adjacent light extraction patterns  180  and  280  or the substrate  100 . 
     When the refracted light is directed toward the adjacent light extraction patterns  180  and  280 , the light control patterns  175  and  275  are not disposed in the concave portions  181  and  281  of the adjacent light extraction patterns  180  and  280 , so that the second electrode E 2  is disposed on the inclined portions of the adjacent light extraction patterns  180  and  280 . The light refracted by the light control patterns  175  and  275  is reflected by the second electrode E 2  disposed on the inclined portions of the adjacent light extraction patterns  180  and  280 , is directed toward the substrate and then is emitted to the outside. In this case, since the light emitted from the light emitting element EP is not polarized light, its phase is not changed even though the light is reflected by the second electrode E 2 , so that the light may be emitted to the outside without being blocked by the optical film  120 . 
     In the organic light emitting display apparatus according to the present disclosure, the light control patterns  175  and  275  are alternately disposed in the concave parts  181  and  281  of the light extraction patterns  180  and  280 , whereby the light emitted from the light emitting element EP may be prevented from being dissipated or trapped by movement to next, and may be reflected inside and emitted to the outside. As described above, the organic light emitting display apparatus according to the present disclosure may improve light extraction efficiency by increasing condensing efficiency. 
     As shown in  FIG.  9 A , in an organic light emitting display apparatus according to a comparative example, external light is reflected inside the display apparatus and is refracted while being emitted to the outside of the display apparatus, whereby Rainbow Mura may occur. As a result of simulation of the organic light emitting display apparatus according to the comparative example, strong luminance of a red color occurs at the center and is spread in a star shape as shown in  FIG.  9 B . In this way, it is noted that the result of simulation in  FIG.  9   b    is similar to a photo of the organic light emitting display apparatus according to the comparative example in  FIG.  9   a   , which shows strong reflective visibility and Rainbow Mura. 
     On the other hand, in the organic light emitting display apparatus according to the present disclosure, as a result of simulation of  FIG.  10   , luminance distribution in the form of a wide concentric circle occurs without having a red color at the center. In the organic light emitting display apparatus according to the present disclosure, it is noted that the light may be prevented from being emitted while being reflected three times inside the display apparatus even though the external light enters the display apparatus, and luminance may be prevented from being strongly concentrated on the center only and may be widely spread in the form of a concentric circle to lower visually perceived intensity. Therefore, in the organic light emitting display apparatus according to the present disclosure, reflective visibility due to the external light may be solved, and Rainbow Mura may be solved. 
     As described above, in the organic light emitting display apparatus according to the present disclosure, the external light reflected inside may be prevented or at least reduced from being emitted and at the same time the light emitted from the organic light emitting layer and trapped inside the organic light emitting display apparatus may be emitted to the outside. As shown in  FIG.  11   , in the organic light emitting display apparatus according to one embodiment (Embodiment 1) and another embodiment (Embodiment 2) of the present disclosure, it is noted that light efficiency is improved as much as 29% based on a viewing angle of 0 in comparison with the organic light emitting display apparatus according to the comparative example. 
     According to the present disclosure, the following advantageous effects may be obtained. 
     In the organic light emitting display apparatus according to the present disclosure, light extraction efficiency of the light emitted from the organic light emitting element may be improved. 
     The organic light emitting display apparatus according to the present disclosure may solve reflective visibility due to reflection of the external light, may prevent black gap from occurring, and may implement real black in a non-driving or off-state. 
     The organic light emitting display according to the present disclosure may solve a problem of Rainbow Mura. 
     It will be apparent to those skilled in the art that the present disclosure described above is not limited by the above-described embodiments and the accompanying drawings and that various substitutions, modifications and variations may be formed in the present disclosure without departing from the spirit or scope of the disclosures. Consequently, the scope of the present disclosure is defined by the accompanying claims and it is intended that all variations or modifications derived from the meaning, scope and equivalent concept of the claims fall within the scope of the present disclosure.