Light-emitting display device

Abstract

The light-emitting display device includes an outer coating layer on a substrate and including a base and a protrusion. The light-emitting display device also includes a first electrode, which is arranged to cover the base and the side of the protrusion. The light-emitting display device also includes a levee layer on a portion of the first electrode. The light-emitting display device also includes a light-emitting layer on the first electrode and the levee layer. The light-emitting display device also includes a second electrode on the light-emitting layer. The levee layer includes a first portion on the protrusion, a second portion surrounding the first portion and including an inclined upper surface, and a light extraction pattern adjacent to the second portion on the first portion.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2019-0058188, filed on May 17, 2019, which is hereby incorporated by reference into this application in its entirety. Technical Field

[0003] The present disclosure relates to a light emitting display device, and more particularly, to a light emitting display device having improved light extraction efficiency. Background Art

[0004] Recently, as society develops toward an information society, the field of display devices for visually expressing electrical information signals has rapidly developed. Accordingly, various display devices having excellent performance in terms of thinness, lightness, and low power consumption have been developed.

[0005] Among various display devices, a light-emitting display device is a self-luminous display device that does not require a separate light source, which is different from a liquid crystal display device. Therefore, the light-emitting display device can be manufactured to be thin and light. In addition, since the light-emitting display device is driven at a low voltage, it is advantageous not only in terms of power consumption but also in terms of color realization, response speed, viewing angle, and contrast (CR). Therefore, it is expected to be used in various fields. Summary of the invention

[0006] The light emitted from the light-emitting layer of the light-emitting display device passes through various components of the light-emitting display device to be released to the outside of the light-emitting display device. However, some of the light emitted from the light-emitting layer is not extracted to the outside of the light-emitting display device, but is captured inside the light-emitting display device, so the light extraction efficiency of the light-emitting display device may become a problem.

[0007] For example, there is the following problem: some of the light emitted from the light-emitting layer is captured in the light-emitting display device due to total reflection loss, waveguide loss, and surface plasmon loss. Here, total reflection loss refers to the reduction in light extraction efficiency caused by light captured in the light-emitting display device due to total reflection at the interface between the substrate and the air, among the light emitted from the light-emitting layer. Waveguide loss refers to the reduction in light extraction efficiency caused by light captured therein due to total reflection at the interface of components in the light-emitting display device. Surface plasmon loss refers to the vibration of free electrons on the metal surface due to the following phenomenon: light is absorbed on the metal surface in the process of allowing light to enter and propagate, so that the light cannot be reflected or transmitted, thereby reducing the light extraction efficiency.

[0008] In order to cope with the above or other limitations associated with the light-emitting display device, the inventors of the present disclosure have invented a light-emitting display device having a new structure to improve the light extraction efficiency of the light-emitting display device by improving or increasing the total reflection loss and the waveguide loss. For example, the inventors of the present disclosure formed an outer coating having a base having a flat upper surface and a protrusion protruding on the base, and an anode having a reflective layer is provided on the sides of the base and the protrusion. Therefore, the reflective layer of the anode formed at the side of the protrusion can be used as a side mirror, and some of the light captured in the light-emitting display device due to total reflection is extracted to the front direction of the light-emitting display. As a result, the light extraction efficiency of the light-emitting display device is improved.

[0009] On the other hand, the inventors of the present disclosure have recognized a limitation in that, even if a light-emitting display device as described above is used, there is still light loss due to waveguide loss.

[0010] For example, some of the light emitted from the light-emitting layer is totally reflected from an area formed by the light-emitting layer, the cathode, and the inorganic encapsulation layer, which is disposed between the embankment layer and the foreign substance covering layer, to be captured. Typically, the refractive index of the material constituting the embankment layer is about 1.6, the refractive index of the organic material constituting the light-emitting layer is about 1.8 to 1.9, the refractive index of the inorganic material constituting the inorganic encapsulation layer is about 1.8, and the refractive index of the organic material constituting the foreign substance covering layer is about 1.5 to 1.6. In addition, the refractive index of the metal material constituting the cathode is about 0.13. However, in a top-emitting light-emitting display device, the cathode is formed to have a very thin thickness, so that the cathode is substantially almost transparent. Therefore, the refractive index of the cathode may not significantly affect the total reflection. Therefore, the cathode can be ignored, and the light-emitting layer and the inorganic encapsulation layer have similar refractive indices, so that total reflection can be performed at the interface between the light-emitting layer and the embankment layer and at the interface between the inorganic encapsulation layer and the foreign substance covering layer.

[0011] In addition, among the light captured due to total reflection at the interface between the light-emitting layer and the bank layer and at the interface between the inorganic encapsulation layer and the foreign matter covering layer, there is light emitted to the outside in the area where the bank layer is formed to be flat. However, the light is totally reflected into the light-emitting display device at the interface between the light-emitting display device and the air, thereby being captured in the light-emitting display device.

[0012] Therefore, the inventors of the present disclosure have also invented a light-emitting display device having a new structure capable of improving or increasing light extraction efficiency of light lost due to waveguide loss and total reflection loss.

[0013] An aspect of the present disclosure is to provide a light emitting display device capable of improving or increasing light extraction efficiency using a side mirror type anode.

[0014] Another aspect of the present disclosure is to provide a light emitting display device capable of minimizing light loss due to waveguide loss which may be caused despite the use of a side mirror type anode.

[0015] Another aspect of the present disclosure is to provide a light emitting display device which improves power consumption by improving or increasing light extraction efficiency.

[0016] Other features and aspects will be described in the following description, and some features will become apparent from the description, or can be learned by practicing the inventive concepts provided herein. Other features and aspects of the inventive concepts can be realized and obtained by structures specifically pointed out in the written description or derived therefrom, its claims and drawings.

[0017] According to one aspect of the present disclosure, a light-emitting display device is provided. The light-emitting display device includes an outer coating layer, which is on a substrate and includes a base and a protrusion. The light-emitting display device also includes a first electrode, which is arranged to cover the base and the side of the protrusion. The light-emitting display device also includes a dam layer on a portion of the first electrode. The light-emitting display device also includes a light-emitting layer on the first electrode and the dam layer. The light-emitting display device also includes a second electrode on the light-emitting layer. The dam layer includes: a first portion on the protrusion; a second portion, which surrounds the first portion and includes an inclined upper surface; and a light extraction pattern adjacent to the second portion on the first portion.

[0018] According to another aspect of the present disclosure, a light-emitting display device is provided. The light-emitting display device includes a substrate. The light-emitting display device also includes an outer coating layer, which is on the substrate and includes a base and a protrusion. The light-emitting display device also includes a light-emitting diode, which is on the outer coating layer and includes a first electrode, a light-emitting layer, and a second electrode. The light-emitting display device also includes a levee layer between the first electrode and the light-emitting layer and defining a light-emitting area. The light-emitting display device also includes an encapsulation unit on the light-emitting diode, the encapsulation unit including a first encapsulation layer, a foreign matter covering layer, and a second encapsulation layer. The upper surface of the levee layer includes a concave pattern or a convex pattern on an inclined surface extending from the light-emitting area, a flat surface spaced apart from the inclined surface, and a flat surface adjacent to the inclined surface to improve the light extraction efficiency and the front efficiency of the light emitted from the light-emitting diode.

[0019] Other systems, methods, features and advantages will be or will become apparent to one skilled in the art by inspection of the following figures and detailed description. It is intended that all such additional systems, methods, features and advantages be included within this specification, be within the scope of the present disclosure, and be protected by the appended claims. Nothing in this section shall be construed as limiting these claims. Other aspects and advantages are discussed below in conjunction with embodiments of the present disclosure. It should be understood that the foregoing general description of the present disclosure and the following detailed description are exemplary and illustrative, and are intended to provide further explanation of the claimed disclosure.

[0020] According to an embodiment of the present disclosure, the light extraction efficiency of the light emitting display device may be improved using a side mirror type anode.

[0021] According to an embodiment of the present disclosure, light lost due to waveguide loss among light emitted from a light emitting layer is reduced, thereby improving light extraction efficiency.

[0022] Embodiments of the present disclosure may realize a light-emitting display device with improved power consumption by improving light extraction efficiency.

[0023] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the inventive concepts as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which may be included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain various principles of the disclosure.

[0025] Figure 1 A plan view illustrating a light emitting display device according to an exemplary embodiment of the present disclosure.

[0026] Figure 2 It is along Figure 1 A cross-sectional view of the light-emitting display device taken along line II-II'.

[0027] Figure 3 yes Figure 2 Magnified view of part B.

[0028] Figure 4A and Figure 4B is an example of a simulation result for describing light extraction of a light emitting display device according to an exemplary embodiment of the present disclosure.

[0029] Figure 5 is an enlarged view of a light emitting display device according to another exemplary embodiment of the present disclosure.

[0030] Figure 6 is an example of a simulation result for describing light extraction of a light emitting display device according to another exemplary embodiment of the present disclosure.

[0031] Fig. 7A and Figure 7B is an enlarged view of a light emitting display device according to another exemplary embodiment of the present disclosure.

[0032] Figure 8 is an enlarged view of a light emitting display device according to another exemplary embodiment of the present disclosure.

[0033] Fig. 9 is an example of a simulation result for describing light extraction of a light emitting display device according to another exemplary embodiment of the present disclosure.

[0034] Fig.10 is an enlarged view of a light emitting display device according to another exemplary embodiment of the present disclosure.

[0035] Fig.11 is an example of a simulation result for describing light extraction of a light emitting display device according to another exemplary embodiment of the present disclosure.

[0036] Fig. 12A and Fig. 12B is an enlarged view of a light emitting display device according to another exemplary embodiment of the present disclosure.

[0037] FIG. 13A to FIG. 13G is an example of simulation results of light extraction paths according to various exemplary embodiments of the present disclosure and comparative examples. DETAILED DESCRIPTION

[0038] By referring to the exemplary embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the methods for achieving the advantages and features will become clear. However, the present disclosure is not limited to the exemplary embodiments disclosed herein, but will be implemented in various forms. The exemplary embodiments are provided only as examples so that those skilled in the art can fully understand the disclosure of the present disclosure and the scope of the present disclosure. Therefore, the present disclosure will be limited only by the scope of the appended claims.

[0039] The shapes, sizes, ratios, angles, quantities, etc. shown in the drawings for describing the exemplary embodiments of the present disclosure are merely examples, and the present disclosure is not limited thereto. Throughout the specification, the same reference numerals generally indicate the same elements. In addition, in the following description of the present disclosure, the detailed description of known related technologies may be omitted to avoid unnecessarily obscuring the subject matter of the present disclosure. Terms such as "including", "having" and "comprising" used herein are generally intended to allow the addition of other components, unless these terms are used together with the term "only". Any reference to the singular may include the plural, unless otherwise expressly stated.

[0040] Even if not explicitly stated, the components are interpreted as including ordinary error ranges.

[0041] When terms such as “on,” “above,” “below,” and “immediately adjacent” are used to describe the positional relationship between two components, unless these terms are used together with the term “adjacent” or “directly,” one or more components may be located between the two components.

[0042] When an element or layer is referred to as being “on” another element or layer, the other layer (or layers) or element (or elements) may be directly on or directly between the other elements.

[0043] Although the terms "first", "second", etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from other components. Therefore, the first component mentioned below can be the second component in the technical concept of the present disclosure.

[0044] Throughout the specification, like reference numerals generally refer to like elements.

[0045] The size and thickness of each component shown in the drawings are illustrated for convenience of description, and the present disclosure is not limited to the size and thickness of the illustrated components.

[0046] The features of the various embodiments of the present disclosure may be partially or completely attached or combined with each other, and may be interlocked and operated in various ways technically, and these embodiments may be performed independently of each other or in relation to each other.

[0047] Hereinafter, a light emitting display device according to an exemplary embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.

[0048] Figure 1 A plan view illustrating a light emitting display device according to an exemplary embodiment of the present disclosure. Figure 2 It is along Figure 1 A cross-sectional view of the light-emitting display device taken along line II-II'.

[0049] Reference Figure 1 and Figure 2 , the light-emitting display device 100 includes a substrate 110, a thin film transistor 120, an overcoat layer 130, a light-emitting diode 140, and a bank layer 150. The light-emitting display device 100 is implemented as a top emission type light-emitting display device.

[0050] The substrate 110 supports and protects several components of the light-emitting display device 100. The substrate 110 may be formed of glass or a plastic material having flexibility. When the substrate 110 is formed of a plastic material, for example, the substrate may be formed of polyimide (PI), but is not limited thereto.

[0051] The substrate 110 includes a display area A / A and a non-display area N / A.

[0052] The display region A / A is a region in which an image is displayed in the light-emitting display device 100, and a display element and various driving elements for driving the display element are provided in the display region A / A. For example, the display element may be composed of a light-emitting diode 140 including a first electrode 141, a light-emitting layer 142, and a second electrode 143. In addition, various driving elements for driving the display element such as a thin film transistor 120, a capacitor, or wiring may be provided in the display region A / A.

[0053] A plurality of sub-pixels SP may be included in the display area A / A. The sub-pixel SP is the smallest unit constituting the screen, and each of the plurality of sub-pixels SP may include a light emitting diode 140 and a driving circuit. The plurality of sub-pixels SP may emit light having different wavelengths. For example, the plurality of sub-pixels SP may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. However, it is not limited thereto, and the plurality of sub-pixels SP may also include a white sub-pixel.

[0054] The driving circuit of the sub-pixel SP is a circuit for controlling the driving of the light emitting diode 140. For example, the driving circuit may be configured to include a thin film transistor 120 and a capacitor, but is not limited thereto.

[0055] The non-display area N / A is an area where no image is displayed, and various components for driving the plurality of sub-pixels SP disposed in the display area A / A may be disposed in the non-display area N / A. For example, a driving IC and a flexible film that provide signals for driving the plurality of sub-pixels SP may be disposed.

[0056] like Figure 1 As shown, the non-display area N / A may be an area surrounding the display area A / A, but is not limited thereto. For example, the non-display area N / A may be an area extending from the display area A / A.

[0057] In the following, reference will be made to Figure 2One sub-pixel SP among the plurality of sub-pixels SP provided in the display area A / A of the light-emitting display device 100 is described in more detail.

[0058] refer to Figure 2 , a buffer layer 111 is disposed on the substrate 110. The buffer layer 111 may be used to improve adhesion between layers formed on the buffer layer 111 and the substrate 110, and to block alkali components leaked from the substrate 110. The buffer layer 111 may be formed as a single layer of silicon nitride (SiNx) or silicon oxide (SiOx), or a multilayer of silicon nitride (SiNx) and silicon oxide (SiOx), but is not limited thereto. The buffer layer 111 may be omitted based on the type or material of the substrate 110 and the structure and type of the thin film transistor 120.

[0059] The thin film transistor 120 is disposed on the buffer layer 111. The thin film transistor 120 may be used as a driving element for driving the light emitting diode 140 of the display area A / A. The thin film transistor 120 includes an active layer 121, a gate electrode 122, a source electrode 123, and a drain electrode 124. Figure 2 The thin film transistor 120 shown in FIG. 1 is a driving transistor, and is a top gate type thin film transistor in which a gate electrode 122 is provided on an active layer 121. However, not limited thereto, the thin film transistor 120 may be implemented as a bottom gate type thin film transistor.

[0060] The active layer 121 is disposed on the buffer layer 111. When the thin film transistor 120 is driven, a channel is formed in the active layer 121. The active layer 121 may be formed of an oxide semiconductor or amorphous silicon (a-Si), polycrystalline silicon (poly-Si), an organic semiconductor, or the like.

[0061] The gate insulating layer 112 is disposed on the active layer 121. The gate insulating layer 112 is a layer for electrically insulating the gate electrode 122 from the active layer 121, and may be formed of an insulating material. For example, the gate insulating layer 112 may be formed as a single layer of silicon nitride (SiNx) or silicon oxide (SiOx) as an inorganic material, or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx), but is not limited thereto.

[0062] In the gate insulating layer 112, contact holes are formed in which the active electrode 123 and the drain electrode 124 contact the source region and the drain region of the active layer 121. The gate insulating layer 112 may be formed in a manner such as Figure 2 The entire surface of the substrate 110 is shown, or is patterned to have the same width as the gate electrode 122, but is not limited thereto.

[0063] The gate electrode 122 is disposed on the gate insulating layer 112. The gate electrode 122 is disposed on the gate insulating layer 112 to overlap with the channel region of the active layer 121. The gate electrode 122 may be one of various metal materials, for example, one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy of two or more thereof or a multilayer thereof, but is not limited thereto.

[0064] The interlayer insulating layer 113 is disposed on the gate electrode 122. For example, the interlayer insulating layer 113 may be formed as a single layer of silicon nitride (SiNx) or silicon oxide (SiOx) as an inorganic material, or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx), but is not limited thereto. In the interlayer insulating layer 113, contact holes are formed, and the source electrode 123 and the drain electrode 124 are respectively in contact with the source region and the drain region of the active layer 121 through the contact holes.

[0065] The source electrode 123 and the drain electrode 124 are disposed on the interlayer insulating layer 113. The source electrode 123 and the drain electrode 124 are disposed on the same layer to be spaced apart from each other. The source electrode 123 and the drain electrode 124 are electrically connected to the active layer 121 through the contact holes in the gate insulating layer 112 and the interlayer insulating layer 113. The source electrode 123 and the drain electrode 124 may be one of various metal materials, for example, one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu) or an alloy of two or more thereof or a multilayer thereof, but is not limited thereto.

[0066] exist Figure 2 In the figure, only the driving transistor among the various thin film transistors 120 in the light emitting display device 100 is shown, but other transistors such as a switching transistor may also be provided.

[0067] A passivation layer 114 for protecting the thin film transistor 120 is disposed on the thin film transistor 120. A contact hole exposing the drain electrode 124 of the thin film transistor 120 is formed on the passivation layer 114. Figure 2 , a contact hole exposing the drain electrode 124 is also shown formed on the passivation layer 114, but is not limited thereto. For example, a contact hole exposing the source electrode 123 may be formed on the passivation layer 114. The passivation layer 114 may be formed as a single layer of silicon nitride (SiNx) or silicon oxide (SiOx), or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx), but is not limited thereto. However, depending on the exemplary embodiment of the present disclosure, the passivation layer 114 may be omitted.

[0068] The overcoat layer 130 is disposed on the passivation layer 114. The overcoat layer 130 is an insulating layer that protects the thin film transistor 120 and flattens the upper portion of the thin film transistor 120. A contact hole exposing the drain electrode 124 of the thin film transistor 120 is formed on the overcoat layer 130. Figure 2 In the embodiment, it is also shown that a contact hole exposing the drain electrode 124 is formed on the overcoat layer 130, but it is not limited thereto. For example, a contact hole exposing the source electrode 123 may be formed on the overcoat layer 130.

[0069] The overcoat layer 130 may be formed of one of acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylene sulfide resin, benzocyclobutene, and photoresist, but is not limited thereto.

[0070] The outer coating 130 includes a base 131 and a protrusion 132. Figure 2 As shown, the base 131 and the protrusion 132 may be integrally formed. For example, the base 131 and the protrusion 132 are formed of the same material to be simultaneously formed through the same process, such as through a mask process, but are not limited thereto.

[0071] The base 131 is disposed on the thin film transistor 120. An upper surface of the base 131 has a surface parallel to the substrate 110. Therefore, a step generated by a component disposed therebelow may be planarized by the base 131.

[0072] The protrusion 132 is provided on the base 131. The protrusion 132 is formed integrally with the base 131 to protrude from the base 131. Therefore, an upper surface of the protrusion 132 may be smaller than a lower surface, but is not limited thereto.

[0073] The protrusion 132 has an upper surface and a side surface. The upper surface of the protrusion 132 is a surface disposed on the uppermost portion of the protrusion 132, and may be a surface substantially parallel to the base 131 or the substrate 110. The side surface of the protrusion 132 may be a surface connecting the upper surface of the protrusion 132 and the base 131. The side surface of the protrusion 132 may be an inclined shape toward the base 131.

[0074] exist Figure 2 , it is shown that the outer coating 130 includes a base 131 having a flat or planar upper surface and a protrusion 132 protruding from the base 131. However, as long as the outer coating 130 is implemented by the base 131 and the protrusion 132, the specific configuration of the outer coating 130 is not limited to the base 131 and the protrusion 132, but may be defined in various ways.

[0075] The light emitting diode 140 is disposed on the overcoat layer 130. The light emitting diode 140 includes a first electrode 141 electrically connected to the drain electrode 124 of the thin film transistor 120, a light emitting layer 142 on the first electrode 141, and a second electrode 143 formed on the light emitting layer 142.

[0076] The first electrode 141 is provided on the outer coating layer 130 to cover the base 131 and the protrusion 132. For example, the first electrode 141 is provided at a partial area of ​​the upper surface of the base 131 where the protrusion 132 is not provided and the side surface where the protrusion 132 is provided and the upper surface of the protrusion 132 according to the shapes of the base 131 and the protrusion 132. However, it is not limited thereto, and the first electrode 141 may be provided only on the upper surface of the base 131 where the protrusion 132 is not provided and the side surface of the protrusion 132.

[0077] The first electrode 141 is electrically connected to the drain electrode 124 through a contact hole formed on the passivation layer 114 and the overcoat layer 130. The first electrode 141 may be an anode of the light emitting diode 140. The first electrode 141 may be electrically connected to the drain electrode 124 of the thin film transistor 120 through the contact hole, but is not limited thereto. For example, the first electrode 141 may be configured to be electrically connected to the source electrode 123 of the thin film transistor 120 through the contact hole based on the type of the thin film transistor 120 and the design method of the driving circuit.

[0078] Even in Figure 2 , the first electrode 141 is shown as a single layer, and the first electrode 141 may be configured as a multilayer. For example, the first electrode 141 may include: a reflective layer that reflects light emitted from the light emitting layer 142 toward the second electrode 143; and a transparent conductive layer that provides holes to the light emitting layer 142.

[0079] The reflective layer is provided on the outer coating 130 to reflect light emitted from the light emitting diode 140 upward. The light generated in the light emitting layer 142 of the light emitting diode 140 can be emitted not only upward but also laterally. The laterally emitted light is guided to the inside of the light emitting display device 100 due to total reflection, or is captured in the light emitting display device 100, or further travels in the direction of the inside of the light emitting display device 100 and then disappears. Therefore, the reflective layer is provided under the light emitting layer 142 to cover the side of the protrusion 132 of the outer coating 130, thereby changing the traveling direction of the light directed to the side of the light emitting layer 142 to the front direction.

[0080] The reflective layer may be formed of a metal material such as aluminum (Al), silver (Ag), copper (Cu), and magnesium-silver alloy (Mg:Ag), but is not limited thereto.

[0081] The transparent conductive layer is disposed on the reflective layer. The transparent conductive layer may be formed of a conductive material having a high work function to provide holes to the light emitting layer 142. For example, the transparent conductive layer may be formed of a transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), and tin oxide (TO), but is not limited thereto.

[0082] The bank layer 150 is disposed on the overcoat layer 130 and the first electrode 141. The bank layer 150 may cover a portion or some portions of the first electrode 141 of the light emitting diode 140 to define a light emitting region A1 and a non-light emitting region A2. For example, the bank layer 150 is not disposed in the light emitting region A1 so that the light emitting layer 142 is disposed immediately on the first electrode 141 to generate light from the light emitting layer 142. In the non-light emitting region A2, the bank layer 150 is disposed between the first electrode 141 and the light emitting layer 142 to block the generation of light.

[0083] The bank layer 150 may be formed of an organic material. For example, the bank layer 150 may be formed of an organic material such as polyimide, acrylic, or benzocyclobutene resin, but is not limited thereto. When the bank layer 150 is composed of an organic material, the refractive index may be about 1.6. Even in Figure 2 In FIG. 1 , it is shown that the bank layer 150 is formed of an organic material, but the bank layer 150 is not necessarily formed of an organic material, but may be formed of an inorganic material.

[0084] The bank layer 150 includes a first portion 151 disposed on the protrusion 132 , a second portion 152 directed from the first portion 151 toward the base 131 , and a light extraction pattern 153 protruding from the first portion 151 .

[0085] The first portion 151 is disposed to cover the protrusion 132 and the first electrode 141 on the protrusion 132. The first portion 151 may flatten the upper portion of the protrusion 132 of the overcoat layer 130. Therefore, the first portion 151 may have a flat or planar upper surface. For example, the upper surface of the first portion 151 may be parallel to the upper surface of the protrusion 132.

[0086] The second portion 152 is disposed to be directed from the first portion 151 toward the base 131. The second portion 152 surrounds the first portion 151 and has an inclined upper surface along a step between an upper surface of the base 131 and an upper surface of the protrusion 132. The second portion 152 may expose a portion or some portions of the first electrode 141 and define a light emitting region A1.

[0087] The light extraction pattern 153 controls the path of light captured between the bank layer 150 and the foreign matter covering layer 162 due to total reflection to increase the amount of extracted light. The light extraction pattern 153 is disposed at a boundary or border between the first portion 151 and the second portion 152, and may be disposed at an edge or end of the first portion 151 adjacent to the second portion 152, for example. The light extraction pattern 153 may be disposed on the protrusion 132 of the overcoat layer 130 and the first electrode 141. Figures 3 to 4B The light extraction pattern 153 of the bank layer 150 and the first protruding pattern 142a of the light emitting layer 142, the second protruding pattern 143a of the second electrode 143, and the third protruding pattern 161a of the first encapsulation layer 161 corresponding thereto are described.

[0088] exist Figure 2 , it is shown that the bank layer 150 includes a first portion 151, a second portion 152, and a light extraction pattern 153. However, as long as the bank layer 150 is implemented by the first portion 151, the second portion 152, and the light extraction pattern 153, the detailed configuration of the bank layer 150 is not limited to the first portion 151, the second portion 152, and the light extraction pattern 153, but may be defined in various ways.

[0089] In addition, even in Figure 2 , it is shown that the first portion 151, the second portion 152, and the light extraction pattern 153 are integrally formed, but is not limited thereto, and at least one of the first portion 151, the second portion 152, and the light extraction pattern 153 may be formed to be separated from each other.

[0090] The light emitting layer 142 is disposed on the first electrode 141. For example, the light emitting layer 142 is disposed on the first electrode 141 in the light emitting region A1, and is disposed on the bank layer 150 in the non-light emitting region A2. The light emitting layer 142 may be disposed according to the shapes of the first electrode 141 and the bank layer 150. In addition, the light emitting layer 142 includes a first protruding pattern 142a corresponding to the light extraction pattern 153 of the bank layer 150.

[0091] The light-emitting layer 142 is a layer for emitting light having a specific color, and includes one of a red light-emitting layer, a green light-emitting layer, a blue light-emitting layer, and a white light-emitting layer. In addition, the light-emitting layer 142 may also include various layers such as a hole transport layer, a hole injection layer, a hole blocking layer, an electron injection layer, an electron blocking layer, or an electron transport layer. The refractive index of the light-emitting layer 142 may vary based on the type of organic material constituting the light-emitting layer 142, but the average refractive index of the organic material used for the light-emitting layer 142 may be about 1.8 to 1.9. The light-emitting layer 142 may be an organic light-emitting layer formed of an organic material, but is not limited thereto. For example, the light-emitting layer 142 may be a quantum dot light-emitting layer or a micro LED.

[0092] The second electrode 143 is disposed on the light emitting layer 142. For example, the second electrode 143 may be disposed on the light emitting layer 142 according to the shape of the light emitting layer 142. The second electrode 143 includes a second protruding pattern 143a corresponding to the first protruding pattern 142a of the light emitting layer 142. The second electrode 143 provides electrons to the light emitting layer 142. The second electrode 143 may be a cathode of the light emitting diode 140.

[0093] The second electrode 143 may be formed of a transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), and tin oxide (TO) or ytterbium (Yb) alloy. When the second electrode 143 is formed of a transparent conductive oxide such as indium tin oxide (ITO), the refractive index of the second electrode 143 may be about 1.8 to 1.9. In addition, the second electrode 143 may be formed of a metal material such as silver (Ag), copper (Cu), or magnesium-silver alloy (Mg:Ag) or a metal material having a very thin thickness, but is not limited thereto. When the second electrode 143 is formed of a metal material, its refractive index is very low. For example, when silver (Ag) is used for the second electrode 143, the refractive index of the second electrode 143 may be about 0.13. However, since the light-emitting display device 100 is a top-emitting type, the second electrode 143 has a very thin thickness, so that the refractive index of the second electrode 143 may not affect the travel of light.

[0094] The encapsulation unit 160 may be formed on the light emitting diode 140 to protect the light emitting diode 140, which is susceptible to moisture, from being exposed to moisture. The encapsulation unit 160 may block oxygen and moisture that penetrate into the light emitting display device 100 from the outside. For example, when the light emitting display device 100 is exposed to moisture or oxygen, a pixel shrinkage phenomenon in which the light emitting region shrinks or dead pixels are generated in the light emitting region occurs. Therefore, the encapsulation unit 160 blocks oxygen and moisture to protect the light emitting display device 100. For example, the encapsulation unit 160 may have a structure in which an inorganic layer and an organic layer are alternately stacked, but is not limited thereto.

[0095] Reference Figure 2 The encapsulation part 160 includes a first encapsulation layer 161 , a foreign matter covering layer 162 and a second encapsulation layer 163 .

[0096] The first encapsulation layer 161 is disposed on the second electrode 143 to suppress or reduce the penetration of moisture or oxygen. The first encapsulation layer 161 may be formed of an inorganic material such as silicon nitride (SiNx), silicon oxynitride (SiNxOy), or aluminum oxide (AlyOz), but is not limited thereto. The first encapsulation layer 161 may be formed of a material having a refractive index greater than that of the foreign matter covering layer 162. For example, the first encapsulation layer 161 is formed of silicon nitride (SiNx) or silicon oxynitride (SiNxOy), and the refractive index of the first encapsulation layer 161 may be about 1.8. The first encapsulation layer 161 may include a third protruding pattern 161a on the second protruding pattern 143a of the second electrode 143.

[0097] The foreign matter covering layer 162 is disposed on the first encapsulation layer 161 to flatten the surface. In addition, the foreign matter covering layer 162 can cover foreign matter or particles that may be generated during the manufacturing process. The foreign matter covering layer 162 can be formed of an organic material such as silicon oxygen carbon (SiOxCz), acrylic acid or epoxy resin, but is not limited thereto. The foreign matter covering layer 162 can be formed of a material with a refractive index less than the refractive index of the first encapsulation layer 161. For example, when the foreign matter covering layer 162 is an acrylic resin, the refractive index of the foreign matter covering layer 162 can be about 1.5 to 1.6.

[0098] The second encapsulation layer 163 is disposed on the foreign matter covering layer 162, and inhibits the penetration of moisture or oxygen together with the first encapsulation layer 161. The second encapsulation layer 163 may be formed of an inorganic material such as silicon nitride (SiNx), silicon nitride oxide (SiNxOy), silicon oxide (SiOx), or aluminum oxide (AlyOz), but is not limited thereto. The second encapsulation layer 163 may be formed of the same material as the first encapsulation layer 161, or may be formed of a different material.

[0099] In the following, we will refer to Figure 3 The light extraction through the light extraction pattern 153 of the bank layer 150 is described in more detail.

[0100] Figure 3 yes Figure 2 Magnified view of part B.

[0101] Reference Figure 3 The first electrode 141 , the bank layer 150 , the light emitting layer 142 , the second electrode 143 , the first encapsulation layer 161 , and the foreign matter covering layer 162 are disposed on the overcoat layer 130 .

[0102] The bank layer 150 exposes a portion or some portions of the first electrode 141 disposed on the base 131, and is disposed on the first electrode 141 and the protrusion 132. The bank layer 150 includes a first portion 151, a second portion 152, and a light extraction pattern 153.

[0103] The light extraction pattern 153 protrudes from the first portion 151. The light extraction pattern 153 controls the path of light emitted from the light emitting layer 142 to increase the amount of light extracted to the outside. Figure 3 , the light extraction pattern 153 is shown to have a convex semicircular shape, but is not limited thereto. For example, as will be described in the following exemplary embodiments, the light extraction pattern may have various protruding shapes, such as a convex pattern with a concave side surface, a triangle, or a trapezoid, etc.

[0104] The light extraction pattern 153 is disposed at a boundary or border between the first portion 151 and the second portion 152. An edge or end of the light extraction pattern 153 may correspond to a point where the first portion 151 and the second portion 152 are connected. For example, an edge or end of the light extraction pattern 153 may correspond to an edge or end of an inclined surface of the second portion 152 connected to the first portion 151, but is not limited thereto. An edge or end of the light extraction pattern 153 may be spaced apart from an edge or end of the inclined surface by a predetermined distance.

[0105] The gradient of the tangent of the portion of the light extraction pattern 153 adjacent to the second portion 152 may be greater than the gradient of the tangent of the portion of the second portion 152 adjacent to the light extraction pattern 153. For example, the slope of the portion of the light extraction pattern 153 adjacent to the second portion 152 may be steeper than the slope of the portion of the second portion 152 adjacent to the light extraction pattern 153. Accordingly, the slopes of the light extraction pattern 153 and the second portion 152 are implemented, and thus, the traveling path of light is changed to improve light extraction efficiency.

[0106] The light extraction pattern 153 may be disposed to surround the light emitting area A1 at a flat or planar surface. For example, the light extraction pattern 153 is disposed at a boundary or border between the first portion 151 and the second portion 152 to surround the light emitting area A1 and has a closed loop shape, but is not limited thereto. The light extraction pattern 153 is composed of a plurality of patterns and forms a closed loop shape surrounding the light emitting area A1.

[0107] The light emitting layer 142 is disposed on the first electrode 141 and the bank layer 150 according to the shapes of the first electrode 141 and the bank layer 150. The light emitting layer 142 includes a first protruding pattern 142a corresponding to the light extraction pattern 153. The second electrode 143 is disposed on the light emitting layer 142 according to the shape of the light emitting layer 142. The second electrode 143 includes a second protruding pattern 143a corresponding to the light extraction pattern 153. The first encapsulation layer 161 is disposed on the second electrode 143 according to the shape of the second electrode 143. The first encapsulation layer 161 includes a third protruding pattern 161a corresponding to the light extraction pattern 153. The foreign matter covering layer 162 is disposed on the first encapsulation layer 161 to flatten the upper portion of the light emitting diode 140.

[0108] The light extraction pattern 153 and the protruding patterns 142a, 143a, and 161a are disposed to overlap the first electrode 141 on the protrusion 132. Therefore, the light path is changed by the light extraction pattern 153 and the protruding patterns 142a, 143a, and 161a, and light incident on the first electrode 141 is reflected by the reflective layer of the first electrode 141 and extracted to the outside of the light-emitting display device 100.

[0109] Since the light-emitting display device 100 according to the exemplary embodiment of the present disclosure is a top-emitting light-emitting display device, the light-emitting display device 100 can be manufactured to realize a microcavity. For example, in the light-emitting display device 100 according to the exemplary embodiment of the present disclosure, the distance between the reflective layer of the first electrode 141 and the second electrode 143 is adjusted, so that constructive interference of light emitted from the light-emitting layer 142 is implemented and optical efficiency is improved.

[0110] In the light-emitting display device of the related art, among the light emitted from the light-emitting layer, the light to be lost is captured in the display device, resulting in a decrease in light efficiency. For example, due to total reflection loss or waveguide loss, some of the light emitted from the light-emitting layer is not extracted to the outside of the light-emitting display device, thereby reducing the light extraction efficiency of the light-emitting display device. For example, in the light-emitting display device of the related art, the first electrode formed on the outer coating layer has a flat upper surface, so that among the light emitted from the light-emitting layer, light with a low emission angle may be captured in the light-emitting display device due to total reflection loss or waveguide loss.

[0111] Therefore, the light-emitting display device 100 according to the exemplary embodiment of the present disclosure uses the outer coating 130 having the protrusion 132 to improve the light extraction efficiency of the light-emitting diode 140. For example, in the display device 100 according to the exemplary embodiment of the present disclosure, the outer coating 130 includes a base 131 and a protrusion 132 protruding from the base 131. In addition, the reflective layer of the first electrode 141 of the light-emitting diode 140 is provided to cover the side surfaces of the base 131 and the protrusion 132. Therefore, among the light emitted from the light-emitting layer 142 of the light-emitting display device 100, the light emitted at a small extraction angle is extracted to the front direction by the first electrode 141 provided at the side of the protrusion 132. For example, when the first electrode is provided on the outer coating having a flat or planar shape as in the light-emitting display device of the related art, the light directed to the lateral direction (i.e., the light emitted at a low extraction angle) does not travel to the front direction, and may not be extracted to the outside of the light-emitting display device due to total reflection loss or waveguide loss. However, in the light-emitting display device 100 according to the exemplary embodiment of the present disclosure, the first light L1 extracted from the light-emitting layer 142 at a low extraction angle is reflected by the first electrode 141 disposed at the side of the protrusion 132 to be extracted to the front direction. Accordingly, in the light-emitting display device 100 according to the exemplary embodiment of the present disclosure, the first electrode 141 disposed at the side of the overcoat layer 130 serves as a side mirror to extract light that may be lost in the light-emitting display device 100 to the front direction. Therefore, light extraction efficiency is improved, and power consumption is improved or increased.

[0112] In addition, in the light-emitting display device 100 according to the exemplary embodiment of the present disclosure, the light extraction pattern 153 is formed on the bank layer 150 to further improve or increase the light extraction efficiency. For example, some light emitted from the light-emitting layer 142 is totally reflected and captured in the region formed by the light-emitting layer 142, the second electrode 143 and the first encapsulation layer 161 between the bank layer 150 and the foreign substance covering layer 162. For example, the refractive index of the material constituting the bank layer 150 is about 1.6, the refractive index of the organic material constituting the light-emitting layer 142 is about 1.8 to 1.9, and the refractive index of the inorganic material constituting the first encapsulation layer 161 is about 1.8. In addition, the refractive index of the organic material constituting the foreign substance covering layer 162 is about 1.5 to 1.6. In addition, even if the second electrode 143 is formed of a transparent conductive material or a metal material, the second electrode 143 has a very thin thickness and is therefore almost transparent. Therefore, since the second electrode 143 can be ignored, total reflection occurs at the interface between the light emitting layer 142 and the bank layer 150 and the interface between the first encapsulation layer 161 and the foreign matter covering layer 162. Thus, light trapped between the bank layer 150 and the foreign matter covering layer 162 may exist.

[0113] In addition, when the upper surface of the bank layer 150 is flat or planar, light captured between the bank layer 150 and the foreign matter covering layer 162 can be extracted to the outside in the area where the bank layer is flat. However, the light is totally reflected again into the light-emitting display device 100 at the interface between the light-emitting display device 100 and the air, and is captured in the light-emitting display device 100.

[0114] Therefore, in the light-emitting display device 100 according to the exemplary embodiment of the present disclosure, the light extraction pattern 153 is provided on the bank layer 150 to control the path of light captured due to total reflection between the bank layer 150 and the foreign matter covering layer 162. For example, the light extraction pattern 153 protruding from the first portion 151 having a convex semicircular shape is provided on the bank layer 150. The first protruding pattern 142a, the second protruding pattern 143a, and the third protruding pattern 161a corresponding to the light extraction pattern 153 are respectively formed on the light-emitting layer 142, the second electrode 143, and the first encapsulation layer 161 on the bank layer 150. Therefore, the light extraction pattern 153 and the protruding patterns 142a, 143a, and 161a can control the path of light and improve or increase the light extraction efficiency. Figure 4A and Figure 4B Improving light extraction efficiency using the light extraction pattern 153 is described in more detail.

[0115] Figure 4A and Figure 4B is an example of a simulation result for describing light extraction of a light emitting display device according to an exemplary embodiment of the present disclosure. Figure 4A and Figure 4B 1 is an image obtained by simulating the light-emitting display device 100 according to the exemplary embodiment of the present disclosure using the RayOptics simulation program, and the refractive index of the bank layer 150 is set to 1.6 and the refractive index of the foreign matter cover layer 162 is set to 1.5. In addition, the light-emitting layer 142, the second electrode 143 and the first encapsulation layer 161 are set as the region S, and the refractive index of the region S is set to 1.8. Figure 4A and Figure 4B In the figure, for the convenience of description, only one light is shown to explain the simulation results.

[0116] Reference Figure 4A and Figure 4B, the paths of the light L2 and L3 emitted from the light emitting layer 142 of the region S are controlled by the light extraction pattern 153 and the third protruding pattern 161a, so that the light L2 and L3 can be extracted to the outside of the light emitting display device 100. For example, the light extraction pattern 153 of the bank layer 150 and the third protruding pattern 161a of the first encapsulation layer 161 have an upwardly convex semicircular shape. Therefore, the paths of the light are changed due to the reflection of the light L2 and L3 at the interface between the light extraction pattern 153 and the third protruding pattern 161a, and the amount of light extracted to the front surface of the light emitting display device 100 may be increased.

[0117] First, refer to Figure 4A , the second light L2 emitted from the light emitting layer 142 passes through the bank layer 150 and the region S, and is totally reflected by the upper surface of the light extraction pattern 153. The totally reflected second light L2 passes through the region S and the foreign matter covering layer 162 to be extracted to the outside of the light emitting display device 100. For example, the second light L2 is totally reflected by the light extraction pattern 153 protruding from the first portion 151 of the bank layer 150, the path of the light is changed to the front surface, and the light is extracted to the front surface of the light emitting display device 100.

[0118] Next, refer to Figure 4B , for example, the third light L3 emitted from the light emitting layer 142 is totally reflected twice by the third protruding pattern 161a in the region S, and the traveling path may be changed. For example, the third light L3 is totally reflected twice at the interface between the convex region S and the foreign matter covering layer 162 set according to the shape of the light extraction pattern 153, passes through the bank layer 150, and is reflected by the first electrode 141. Thereafter, the third light L3 passes through the bank layer 150, the region S, and the foreign matter covering layer 162, and is extracted to the outside of the light emitting display device 100. For example, the optical path of the third light L3 is changed by the shape of the third protruding pattern 161a, and the third light L3 is reflected by the first electrode 141 and travels at a small incident angle. Therefore, the third light L3 is extracted to the front surface of the light emitting display device 100.

[0119] Therefore, in the light-emitting display device 100 according to the exemplary embodiment of the present disclosure, the light extraction efficiency can be improved by the light extraction pattern 153 of the bank layer 150. When the light extraction pattern 153 is omitted and the upper surface of the bank layer 150 has a flat or planar shape, the light L2 and L3 may be captured in the region S due to total reflection and loss caused by the total reflection. However, in the light-emitting display device 100 according to the exemplary embodiment of the present disclosure, the reflection angle of the light that may be captured between the foreign matter cover layer 162 and the bank layer 150 is changed by the convex semicircular shape of the light extraction pattern 153 of the bank layer 150. Therefore, the light extracted to the front surface of the light-emitting device 100 can be increased. Accordingly, the light extraction efficiency of the light-emitting display device 100 can be improved and the power consumption can be improved.

[0120] Figure 5 is an enlarged view of a light-emitting display device 200 according to another exemplary embodiment of the present disclosure. Figure 5 The bank layer 250, the light emitting diode 240 and the first encapsulation layer 261 of the light emitting display device 200 are Figure 1 and Figure 3 The light-emitting display device 100 is different, but the other configurations are substantially the same, so repeated descriptions will be omitted or may be briefly provided. For example, Figure 5 The enlarged view in FIG. 1 is an enlarged view of a portion of the light-emitting display device 200. Figure 2 The B part is similar.

[0121] Reference Figure 5 , the bank layer 250 includes a first portion 151, a second portion 152, and a light extraction pattern 253. The light extraction pattern 253 of the bank layer 250 protrudes from the first portion 151 to have a convex pattern. The light extraction pattern 253 includes a concave side surface. For example, the surface between the vertex of the uppermost edge or portion of the light extraction pattern 253 and the first portion 151 and the second portion 152 may be formed as a concave curved surface.

[0122] The light emitting layer 242 includes a first protruding pattern 242a corresponding to the light extraction pattern 253. The second electrode 243 includes a second protruding pattern 243a corresponding to the light extraction pattern 253. The first encapsulation layer 261 includes a third protruding pattern 261a corresponding to the light extraction pattern 253. For example, the light emitting layer 242, the second electrode 243, and the first encapsulation layer 261 are disposed according to the shape of the light extraction pattern 253 disposed thereunder.

[0123] In the light-emitting display device 200 according to another exemplary embodiment of the present disclosure, a light extraction pattern 253 protruding with a concave side surface, and first protruding patterns 242a, second protruding patterns 243a, and third protruding patterns 261a corresponding thereto are formed. Therefore, the light extraction pattern 253 and the protruding patterns 242a, 243a, and 261a can control the path of light and improve light extraction efficiency. Figure 6 Improving light extraction efficiency using the light extraction pattern 253 is described in more detail.

[0124] Figure 6 is an example of a simulation result for describing light extraction of a light emitting display device according to another exemplary embodiment of the present disclosure. Figure 6 2 is an image obtained by simulating the light-emitting display device 200 according to another exemplary embodiment of the present disclosure using a Ray Optics simulation program. For ease of description, only one light that can explain the simulation result is shown.

[0125] Reference Figure 6 , the path of the light L4 emitted from the light emitting layer 242 of the region S is controlled by the light extraction pattern 253 and the third protruding pattern 261a, and the light L4 may be extracted to the outside of the light emitting display device 200. For example, the light extraction pattern 253 of the bank layer 250 and the third protruding pattern 261a of the first encapsulation layer 161 protrude upward with a concave side surface. Therefore, the path of the light is changed due to reflection of the light L4 at the interface between the light extraction pattern 253 and the third protruding pattern 261a, and the amount of light extracted to the front surface of the light emitting display device 200 may be increased.

[0126] Reference Figure 6 , the fourth light L4 emitted from the light emitting layer 142 is totally reflected by the upper surface of the light extraction pattern 253. The totally reflected fourth light L4 passes through the foreign matter covering layer 162 and is extracted to the outside of the light emitting display device 200. For example, the path of the fourth light L4 is changed to the front surface by the light extraction pattern 253 protruding from the first portion 251 of the bank layer 250, and the light is extracted to the front surface of the light emitting display device 200.

[0127] Therefore, in the light-emitting display device 200 according to another exemplary embodiment of the present disclosure, the reflection angle of light captured between the foreign matter covering layer 162 and the bank layer 250 may change due to the concave side surface of the light extraction pattern 253 of the bank layer 250. Therefore, it is possible to increase the light extracted to the front surface of the light-emitting device 200. Accordingly, the light extraction efficiency of the light-emitting display device 200 is improved and the power consumption can be improved.

[0128] Fig. 7A and Figure 7B is an enlarged view of a light emitting display device according to another exemplary embodiment of the present disclosure. Fig. 7A The bank layer 350, the light emitting diode 340 and the first encapsulation layer 361 of the light emitting display device 300 are Figure 1 and Figure 3 The light-emitting display device 100 is different, but the other configurations are substantially the same, so repeated descriptions will be omitted or may be briefly provided. Figure 7B The bank layer 450, the light emitting diode 440 and the first encapsulation layer 461 of the light emitting display device 400 are Figure 1 and Figure 3 The light-emitting display device 100 is different, but other configurations are substantially the same, so a repeated description will be omitted or may be briefly provided.

[0129] First, refer to Fig. 7A , the bank layer 350 includes a first portion 151, a second portion 152, and a light extraction pattern 353. The light extraction pattern 353 of the bank layer 350 protrudes from the first portion 151 to have a triangular shape.

[0130] The light emitting layer 342 includes a first protruding pattern 342a corresponding to the light extraction pattern 353. The second electrode 343 includes a second protruding pattern 343a corresponding to the light extraction pattern 353. The first encapsulation layer 361 includes a third protruding pattern 361a corresponding to the light extraction pattern 353. For example, the light emitting layer 342, the second electrode 343, and the first encapsulation layer 361 are disposed according to the shape of the light extraction pattern 353 disposed thereunder.

[0131] Next, refer to Figure 7B , the bank layer 450 includes a first portion 151, a second portion 152, and a light extraction pattern 453. The light extraction pattern 453 of the bank layer 450 protrudes from the first portion 151 to have a trapezoidal shape.

[0132] The light emitting layer 142 includes a first protruding pattern 442a corresponding to the light extraction pattern 453. The second electrode 443 includes a second protruding pattern 443a corresponding to the light extraction pattern 453. The first encapsulation layer 461 includes a third protruding pattern 461a corresponding to the light extraction pattern 453. For example, the light emitting layer 442, the second electrode 443, and the first encapsulation layer 461 are disposed according to the shape of the light extraction pattern 453 disposed thereunder.

[0133] In the light-emitting display device 300 according to another exemplary embodiment of the present disclosure, a light extraction pattern 353 protruding in a triangular shape and first protruding patterns 342a, second protruding patterns 343a, and third protruding patterns 361a corresponding thereto are formed. In addition, in the light-emitting display device 400 according to another exemplary embodiment of the present disclosure, a light extraction pattern 453 protruding in a trapezoidal shape and first protruding patterns 442a, second protruding patterns 443a, and third protruding patterns 461a corresponding thereto are formed. Therefore, in the light-emitting display devices 300 and 400 according to various exemplary embodiments of the present disclosure, the light extraction patterns 353 and 453 and the protruding patterns 342a, 343a, 361a, 442a, 443a, and 461a can control the path of light and improve light extraction efficiency.

[0134] exist Figures 2 to 7B , the light extraction patterns 153, 253, 353, and 453 respectively have a semicircular shape, a convex pattern with a concave side surface, a triangular shape, and a trapezoidal shape, but are not limited thereto, and may have various shapes protruding upward. For example, as long as the shape can control the path of light and improve light extraction efficiency, any shape may be applied regardless of the shape. For example, Fig. 7A The enlarged view in FIG. 1 is an enlarged view of a portion of the light-emitting display device 300, which will be Figure 2 Similar to Part B. In addition, Figure 7BThe enlarged view in FIG. 4 is an enlarged view of a portion of the light-emitting display device 400. Figure 2 The B part is similar.

[0135] Figure 8 is an enlarged view of a light emitting display device according to another exemplary embodiment of the present disclosure. Figure 8 The bank layer 550, the light emitting diode 540 and the first encapsulation layer 561 of the light emitting display device 500 are Figure 1 and Figure 3 The light-emitting display device 100 is different, but the other configurations are substantially the same, so repeated descriptions will be omitted or may be briefly provided. For example, Figure 8 The enlarged view in FIG. 1 is an enlarged view of a portion of the light-emitting display device 500, which is Figure 2 The B part is similar.

[0136] Reference Figure 8 , the bank layer 550 includes a first portion 151, a second portion 152, and a light extraction pattern 553. The light extraction pattern 553 is formed to have a concave pattern directed inward from the upper surface of the first portion 151. For example, the light extraction pattern 553 may have a concave semicircular shape.

[0137] The light emitting layer 542 includes a first groove pattern 542a corresponding to the light extraction pattern 553. The second electrode 543 includes a second groove pattern 543a corresponding to the light extraction pattern 553. The first encapsulation layer 561 includes a third groove pattern 561a corresponding to the light extraction pattern 553. For example, the light emitting layer 542, the second electrode 543, and the first encapsulation layer 561 are disposed according to the shape of the light extraction pattern 553 disposed thereunder.

[0138] In a light-emitting display device 500 according to another exemplary embodiment of the present disclosure, a light extraction pattern 553 having a concave semicircular shape and first, second, and third groove patterns 542a, 543a, and 561a corresponding thereto are formed. Therefore, the light extraction pattern 553 and the groove patterns 542a, 543a, and 561a can control the path of light and improve light extraction efficiency. Fig. 9 Improving light extraction efficiency using the light extraction pattern 553 is described in more detail.

[0139] Fig. 9 is an example of a simulation result for describing light extraction of a light emitting display device according to another exemplary embodiment of the present disclosure. Fig. 9 is an image obtained by simulating the light emitting display device 500 according to another exemplary embodiment of the present disclosure using a Ray Optics simulation program. For ease of description, only one light that can explain the simulation result is shown.

[0140] Reference Fig. 9 , the path of the sixth light L6 emitted from the light emitting layer 542 of the region S is controlled by the light extraction pattern 553 and the third groove pattern 561a, and the light L6 may be extracted to the outside of the light emitting display device 500. For example, the light extraction pattern 553 of the bank layer 550 and the third groove pattern 561a of the first encapsulation layer 561 have an inwardly concave semicircular shape. Therefore, the path of the light is changed due to the reflection of the sixth light L6 performed at the interface between the light extraction pattern 553 and the third groove pattern 561a, and the amount of light extracted to the front surface of the light emitting display device 500 may increase.

[0141] For example, the sixth light L6 emitted from the light emitting layer 542 is totally reflected twice by the upper surface of the region S and the third groove pattern 561a, and the traveling path of the sixth light can be changed. For example, the sixth light L6 is totally reflected twice at the interface between the convex region S and the foreign matter covering layer 162 set according to the shape of the light extraction pattern 553, and passes through the embankment layer 550, and is reflected by the first electrode 141. After that, the sixth light L6 passes through the embankment layer 550, the region S and the foreign matter covering layer 562, and is extracted to the outside of the light emitting display device 500. For example, the path of the sixth light L6 is changed by the shape of the light extraction pattern 553 and the third groove pattern 561a, and the sixth light L6 is reflected by the first electrode 141 and travels at a small incident angle. Therefore, the sixth light L6 can be extracted to the front surface of the light emitting display device 500.

[0142] Therefore, in the light-emitting display device 500 according to another exemplary embodiment of the present disclosure, the light extraction efficiency may be improved by the light extraction pattern 553 of the embankment layer 550. When the light extraction pattern 553 is omitted and the upper surface of the embankment layer 550 has a flat or planar shape, the sixth light L6 may be captured in the region S due to total reflection and loss due to total reflection. However, in the light-emitting display device 500 according to another exemplary embodiment of the present disclosure, the reflection angle of the light that may be captured between the foreign matter cover layer 162 and the embankment layer 550 may be changed by the concave semicircular shape of the light extraction pattern 553 of the embankment layer 550. Therefore, the light extracted to the front surface of the light-emitting device 500 may be increased. Accordingly, the light extraction efficiency of the light-emitting display device 500 may be improved and the power consumption may be improved.

[0143] Fig.10 is an enlarged view of a light emitting display device according to another exemplary embodiment of the present disclosure. Fig.10 The bank layer 650, the light emitting diode 640 and the first encapsulation layer 661 of the light emitting display device 600 are Figure 8 The light-emitting display device 500 is different, but the other configurations are substantially the same, so repeated descriptions are omitted or can be briefly provided. For example, Fig.10 The enlarged view in FIG. 1 is an enlarged view of a portion of the light-emitting display device 600. Figure 2 The B part is similar.

[0144] Reference Fig.10 , the bank layer 650 includes a first portion 151, a second portion 152, and a light extraction pattern 653. The light extraction pattern 653 of the bank layer 650 is formed as a groove of a trapezoidal shape pointing inward from the first portion 151. For example, the light extraction pattern 653 may be a groove having a concave trapezoidal shape. The lower surface of the trapezoidal shape may be smaller than the upper surface.

[0145] The light emitting layer 642 includes a first groove pattern 642a corresponding to the light extraction pattern 653. The second electrode 643 includes a second groove pattern 643a corresponding to the light extraction pattern 653. The first encapsulation layer 661 includes a third groove pattern 661a corresponding to the light extraction pattern 653. For example, the light emitting layer 642, the second electrode 643, and the first encapsulation layer 661 are disposed according to the shape of the light extraction pattern 653 disposed thereunder.

[0146] In the light-emitting display device 600 according to another exemplary embodiment of the present disclosure, a light extraction pattern 653 having a concave trapezoidal shape and first, second, and third groove patterns 642a, 643a, and 661a corresponding thereto are formed. Therefore, the light extraction pattern 653 and the groove patterns 642a, 643a, and 661a can control the path of light and improve light extraction efficiency. Fig.11 Improving light extraction efficiency using the light extraction pattern 653 is described in more detail.

[0147] Fig.11 is an example of a simulation result for describing light extraction of a light emitting display device according to another exemplary embodiment of the present disclosure. Fig.11 is an image obtained by simulating the light emitting display device 600 according to another exemplary embodiment of the present disclosure using a Ray Optics simulation program. For ease of description, only one type of light extracted to the front surface is shown as a simulation result.

[0148] Reference Fig.11 , the path of the seventh light L7 emitted from the light emitting layer 642 of the region S is controlled by the light extraction pattern 653 and the third groove pattern 661a, and the light L7 can be extracted to the outside of the light emitting display device. For example, the light extraction pattern 653 of the bank layer 650 and the third groove pattern 661a of the first encapsulation layer 661 have a concave trapezoidal shape. Therefore, the path of the light is changed due to the reflection of the seventh light L7 at the interface therebetween, and the amount of light extracted to the front surface of the light emitting display device 600 can be increased.

[0149] For example, the seventh light L7 emitted from the light emitting layer 642 is totally reflected three times by the upper surface of the region S, and the traveling path of the seventh light may be changed. For example, the seventh light L7 is totally reflected three times at the interface between the concave region S and the foreign matter covering layer 162, which is set according to the shape of the light extraction pattern 653, and passes through the embankment layer 650 to be reflected by the first electrode 141. Thereafter, the seventh light L7 passes through the embankment layer 650, the region S, and the foreign matter covering layer 162, and is extracted to the outside of the light emitting display device 600. For example, the path of the seventh light L7 is changed by the shapes of the light extraction pattern 653 and the third groove pattern 661a, and the seventh light L7 is reflected by the first electrode 141 and travels at a small incident angle. Therefore, the seventh light L7 is extracted to the front surface of the light emitting display device 600.

[0150] Therefore, in the light-emitting display device 600 according to another exemplary embodiment of the present disclosure, the light extraction efficiency can be improved by the light extraction pattern 653 of the embankment layer 650. When the light extraction pattern 653 is omitted and the upper surface of the embankment layer 650 has a flat or planar shape, the seventh light L7 is captured in the region S due to total reflection and the loss caused by the total reflection. However, in the light-emitting display device 600 according to another exemplary embodiment of the present disclosure, the reflection angle of the light that may be captured between the foreign matter cover layer 162 and the embankment layer 650 can be changed by the concave trapezoidal shape of the light extraction pattern 653 of the embankment layer 650. Therefore, the light extracted to the front surface of the light-emitting device 600 can be increased. Accordingly, the light extraction efficiency of the light-emitting display device 600 can be improved and the power consumption can be improved.

[0151] Fig. 12A and Fig. 12B is an enlarged view of a light emitting display device according to another exemplary embodiment of the present disclosure. Fig. 12A The bank layer 750, the light emitting diode 740 and the first encapsulation layer 761 of the light emitting display device 700 are Figure 8 The light-emitting display device 500 is different, but other configurations are substantially the same, so repeated descriptions are omitted or may be briefly provided. Fig. 12B The bank layer 850, the light emitting diode 840 and the first encapsulation layer 861 of the light emitting display device 800 are Figure 8 The light-emitting display device 500 is different, but the other configurations are substantially the same, so repeated descriptions are omitted or can be briefly provided. For example, Fig. 12A The enlarged view in FIG. 1 is an enlarged view of a portion of the light-emitting display device 700, which will be Figure 2 The B part is similar. Fig. 12B The enlarged view in FIG. 8 is an enlarged view of a portion of the light-emitting display device 800. Figure 2 The B part is similar.

[0152] First, refer to Fig. 12A , the bank layer 750 includes a first portion 151, a second portion 152, and a light extraction pattern 753. The light extraction pattern 753 of the bank layer 750 is formed as a concave pattern having a convex side surface from the first portion 151 toward the inside. For example, the vertex of the lowest edge of the light extraction pattern 753 and the surface between the first portion 151 and the second portion 152 may be formed as a convex curved surface.

[0153] The light emitting layer 742 includes a first groove pattern 742a corresponding to the light extraction pattern 753. The second electrode 743 includes a second groove pattern 743a corresponding to the light extraction pattern 753. The first encapsulation layer 761 includes a third groove pattern 761a corresponding to the light extraction pattern 753. For example, the light emitting layer 742, the second electrode 743, and the first encapsulation layer 761 are disposed according to the shape of the light extraction pattern 753 disposed thereunder.

[0154] Next, refer to Fig. 12B , the bank layer 850 includes a first portion 151, a second portion 152, and a light extraction pattern 853. The light extraction pattern 853 of the bank layer 850 is formed as a triangular-shaped groove directed from the first portion 151 to the inside.

[0155] The light emitting layer 842 includes a first groove pattern 842a corresponding to the light extraction pattern 853. The second electrode 843 includes a second groove pattern 843a corresponding to the light extraction pattern 853. The first encapsulation layer 861 includes a third groove pattern 861a corresponding to the light extraction pattern 853. For example, the light emitting layer 842, the second electrode 843, and the first encapsulation layer 861 are disposed according to the shape of the light extraction pattern 853 disposed thereunder.

[0156] In the light-emitting display device 700 according to another exemplary embodiment of the present disclosure, a light extraction pattern 753 having a concave pattern including a convex side surface and first, second, and third groove patterns 742a, 743a, and 761a corresponding thereto are formed. In the light-emitting display device 800 according to another exemplary embodiment of the present disclosure, a light extraction pattern 853 having a concave triangular shape and first, second, and third groove patterns 842a, 843a, and 861a corresponding thereto are formed. Therefore, in the light-emitting display devices 700 and 800 according to various exemplary embodiments of the present disclosure, the light extraction patterns 753 and 853 and the groove patterns 742a, 743a, 761a, 842a, 843a, and 861a can control the path of light and improve light extraction efficiency.

[0157] FIG. 13A to FIG. 13Gis an example of simulation results of light extraction paths according to an embodiment of the present disclosure and comparative examples of light emitting display devices according to various exemplary embodiments of the present disclosure. Fig. 13B yes Figure 1 and Figure 3 A simulation image of the light-emitting display device 100 is shown in FIG. Fig. 13C yes Figure 5 A simulation image of the light-emitting display device 200 is shown in FIG. Fig.13D yes Fig. 7A A simulation image of the light-emitting display device 300 is shown in FIG. Fig.13E yes Figure 7B A simulated image of the light-emitting display device 400 is shown in FIG. Fig.13F yes Figure 8 A simulation image of the light-emitting display device 500 is shown in FIG. Figure 13G yes Fig.10 A simulated image of the light-emitting display device 600 is shown in FIG. Fig.13A is a simulated image of a light emitting display device according to a comparative example. Since the upper surface of the bank layer 50 is flat, the light emitting display device according to the comparative example does not include a light extraction pattern. Therefore, the light emitting layer 42, the second electrode 43, and the first encapsulation layer 61 on the bank layer 50 all have a flat shape. FIG. 13A to FIG. 13G shows simulated images using the Ray Optics simulation program, and about FIG. 13A to FIG. 13G The simulation performed is a simulation of light extraction generated on the side and upper portions of the protrusion 132. Therefore, light emitted to the central area is omitted. FIG. 13A to FIG. 13G , it is assumed that air is provided above the foreign matter cover layer 162 and the refractive index of the air is set to 1.

[0158] First, refer to Fig.13A In the light-emitting display device according to the comparative example, the upper surface of the bank layer 50 is a flat shape. The light-emitting display device according to the comparative example does not include a light extraction pattern as included in various exemplary embodiments of the present disclosure. Therefore, the light-emitting layer 42, the second electrode 43, and the first encapsulation layer 61 on the bank layer 50 all have a flat shape. Therefore, referring to Fig.13A , a plurality of lights are still captured in the region S. In addition, some lights whose light paths are changed in a slope-changing manner near the side of the protrusion 132 are extracted to the outside, but are extracted at an elevation angle or a large angle. Therefore, it is confirmed that the light has a large incident angle, and therefore, the light is not extracted to the outside of the foreign matter cover layer 162, and most of the light is captured at the interface between the foreign matter cover layer 162 and the air due to total reflection.

[0159] Reference Fig. 13BIn the light emitting display device 100 according to the exemplary embodiment of the present disclosure, the light extraction pattern 153 having a convex semicircular shape may be used to increase the light extraction efficiency. First, referring to Fig. 13B At the first point P1, some light emitted from the light emitting layer 142 is totally reflected multiple times at the interface set as the convex area S according to the shape of the light extraction pattern 153 and the foreign matter covering layer 162, and thus the traveling path is changed. In addition, the light is reflected by the first electrode 141 and extracted to the front direction of the light emitting display device 100. In addition, referring to Fig. 13B At the second point P2′, some light emitted from the light emitting layer 142 is totally reflected by the upper surface of the light extraction pattern 153, and thus extracted to the front direction of the light emitting display device 100. Accordingly, in the light emitting display device 100 according to the exemplary embodiment of the present disclosure, the light extraction pattern 153 having a convex semicircular shape serves to increase light extraction efficiency, and in particular, improve front efficiency.

[0160] Next, refer to Fig. 13C In a light-emitting display device 200 according to another exemplary embodiment of the present disclosure, a light extraction pattern 253 having a convex pattern including a concave side surface is used to increase light extraction efficiency and can improve a viewing angle. First, referring to Fig. 13C At the third point P3, some of the light emitted from the light emitting layer 242 is totally reflected by the upper surface of the light extraction pattern 253, and thus is extracted to the front direction of the light emitting display device 200. Fig. 13C At the fourth point P4, some light emitted from the light emitting layer 242 is totally reflected by the upper surface of the light extraction pattern 253, and thus some light is extracted to the side direction of the light emitting display device 200. Accordingly, in the light emitting display device 200 according to another exemplary embodiment of the present disclosure, the light extraction pattern 253 having a convex pattern including a concave side surface is used to increase light extraction efficiency and improve a viewing angle.

[0161] Next, refer to Fig.13D In a light emitting display device 300 according to another exemplary embodiment of the present disclosure, a light extraction pattern 353 protruding in a triangular shape is used to increase light extraction efficiency. First, referring to Fig.13D At the fifth point P5, some light emitted from the light emitting layer 342 is totally reflected by the upper surface of the light extraction pattern 353, and thus some light is extracted to the front direction of the light emitting display device 300. Accordingly, in the light emitting display device 300 according to another exemplary embodiment of the present disclosure, the light extraction pattern 353 protruding in a triangular shape serves to increase light extraction efficiency, and specifically, improve front efficiency.

[0162] Next, refer to Fig.13EIn a light emitting display device 400 according to another exemplary embodiment of the present disclosure, a light extraction pattern 453 protruding in a trapezoidal shape is used to increase light extraction efficiency. First, referring to Fig.13E At the sixth point P6, some light emitted from the light emitting layer 442 is totally reflected multiple times at the interface of the region S protruding in a trapezoidal shape according to the shape of the light extraction pattern 453 and the foreign matter covering layer 162, and the traveling path is changed. In addition, the light is reflected by the first electrode 141 and extracted to the front direction of the light emitting display device 400. In addition, referring to Fig.13E At the seventh point P7, some light emitted from the light emitting layer 442 is totally reflected by the upper surface of the light extraction pattern 453, and thus some light is extracted to the front direction of the light emitting display device 400. Accordingly, in the light emitting display device 400 according to another exemplary embodiment of the present disclosure, the light extraction pattern 453 protruding in a trapezoidal shape serves to increase light extraction efficiency, and specifically, improve front efficiency.

[0163] Next, refer to Fig.13F In a light emitting display device 500 according to another exemplary embodiment of the present disclosure, a light extraction pattern 553 having a concave semicircular shape is used to increase light extraction efficiency. First, referring to Fig.13F At the eighth point P8, some of the light emitted from the light emitting layer 542 is totally reflected multiple times at the interface of the region S having a concave semicircular shape according to the shape of the light extraction pattern 553 and the foreign matter covering layer 162, and the traveling path is changed. In addition, the light is reflected by the first electrode 141 and extracted to the front direction of the light emitting display device 500. Accordingly, in the light emitting display device 500 according to another exemplary embodiment of the present disclosure, the light extraction pattern 553 having a concave semicircular shape is used to increase the light extraction efficiency, and specifically, improve the front efficiency.

[0164] Next, refer to Figure 13G In a light emitting display device 600 according to another exemplary embodiment of the present disclosure, a light extraction pattern 653 having a concave trapezoidal shape is used to increase light extraction efficiency. First, referring to Figure 13G At the ninth point P9, some of the light emitted from the light emitting layer 642 is totally reflected at the interface of the region S having a concave trapezoidal shape according to the shape of the light extraction pattern 653 and the foreign matter covering layer 162, and the traveling path is changed. In addition, the light is reflected by the first electrode 141 to be extracted to the front direction of the light emitting display device 600. Accordingly, in the light emitting display device 600 according to another exemplary embodiment of the present disclosure, the light extraction pattern 653 having a concave trapezoidal shape is used to increase the light extraction efficiency, and specifically, improve the front efficiency.

[0165] The light extraction efficiency and the front efficiency of various exemplary embodiments of the present disclosure and comparative examples as described above are shown in Tables 1 and 2 below.

[0166] [Table 1]

[0167]

[0168] [Table 2]

[0169]

[0170]

[0171] First, Table 1 shows the overall light extraction efficiency of the comparative example and the embodiment of the present disclosure. Referring to Table 1, it can be confirmed that, in the light-emitting display device 100 according to the exemplary embodiment of the present disclosure as Embodiment 1, the light extracted to the outside of the light-emitting display device 100 increases by 12.5% ​​compared to the light-emitting display device without the light extraction pattern in the comparative example. It can be confirmed that, in the light-emitting display device 500 according to another exemplary embodiment of the present disclosure as Embodiment 2, the light extracted to the outside of the light-emitting display device 500 increases by 8.3%.

[0172] In addition, Table 2 shows the front efficiency of the comparative example and the embodiment of the present disclosure. Here, the front efficiency refers to the extraction efficiency of light having a viewing angle between -10 degrees and +10 degrees relative to the front surface of the light-emitting display device. Referring to Table 2, it can be confirmed that, compared with the light-emitting display device without a light extraction pattern in the comparative example, in the light-emitting display device 100 according to the exemplary embodiment of the present disclosure as embodiment 1 and the light-emitting display device 100 according to embodiment 1 and the light-emitting display device 500 according to another exemplary embodiment of the present disclosure as embodiment 2, the light extracted to the front direction of the light-emitting display devices 100 and 500 is increased by 22.2%.

[0173] A light emitting display device according to one or more embodiments of the present disclosure will be described below.

[0174] A light-emitting display device according to an embodiment of the present disclosure includes a substrate. The light-emitting display device also includes an outer coating layer on the substrate and including a base and a protrusion. The light-emitting display device also includes a first electrode arranged to cover the side of the base and the protrusion. The light-emitting display device also includes a dyke layer on a portion of the first electrode. The light-emitting display device also includes a light-emitting layer on the first electrode and the dyke layer. The light-emitting display device also includes a second electrode on the light-emitting layer. The dyke layer includes: a first portion on the protrusion; a second portion surrounding the first portion and including an inclined upper surface; and a light extraction pattern on the first portion adjacent to the second portion.

[0175] According to some embodiments of the present disclosure, the light extraction pattern may be provided on the protrusion.

[0176] According to some embodiments of the present disclosure, the first electrode may include a reflective layer and may be disposed between the protrusion and the light extraction pattern.

[0177] According to some embodiments of the present disclosure, the light extraction pattern may protrude from an upper surface of the first portion.

[0178] According to some embodiments of the present disclosure, the shape of the light extraction pattern may have one of a semicircle, a convex pattern having a concave side surface, a triangle, and a trapezoid.

[0179] According to some embodiments of the present disclosure, a gradient of a tangent line of a portion of the light extraction pattern adjacent to the second portion may be greater than a gradient of a tangent line of a portion of the second portion adjacent to the light extraction pattern.

[0180] According to some embodiments of the present disclosure, the light extraction pattern may include a concave pattern from an upper surface of the first portion toward the inside.

[0181] According to some embodiments of the present disclosure, the light extraction pattern may have any one of a semicircle, a concave pattern having a convex side surface, a triangle, and a trapezoid.

[0182] According to some embodiments of the present disclosure, the light emitting layer and the second electrode may be provided in a shape corresponding to a light extraction pattern.

[0183] According to some embodiments of the present disclosure, the light-emitting display device may further include a first encapsulation layer on the second electrode. The light-emitting display device may further include a foreign matter covering layer on the first encapsulation layer. The first encapsulation layer may be configured to correspond to the shape of the second electrode.

[0184] According to some embodiments of the present disclosure, a refractive index of the bank layer may be smaller than a refractive index of the light emitting layer, and a refractive index of the foreign matter cover layer may be smaller than a refractive index of the first encapsulation layer.

[0185] A light-emitting display device according to an embodiment of the present disclosure includes a substrate. The light-emitting display device also includes an outer coating layer, which is on the substrate and includes a base and a protrusion. The light-emitting display device also includes a light-emitting diode, which is on the outer coating layer and includes a first electrode, a light-emitting layer, and a second electrode. The light-emitting display device also includes a levee layer between the first electrode and the light-emitting layer and defining a light-emitting area. The light-emitting display device also includes an encapsulation portion on the light-emitting diode, the encapsulation portion including a first encapsulation layer, a foreign matter covering layer, and a second encapsulation layer. The upper surface of the levee layer includes a concave pattern or a convex pattern on an inclined surface extending from the light-emitting area, a flat surface spaced apart from the inclined surface, and a flat surface adjacent to the inclined surface to improve the light extraction efficiency and the front efficiency of the light emitted from the light-emitting diode.

[0186] According to some embodiments of the present disclosure, a concave pattern or a convex pattern may be provided to surround the light emitting area.

[0187] According to some embodiments of the present disclosure, a concave pattern or a convex pattern may be provided on the protrusion and the first electrode.

[0188] According to some embodiments of the present disclosure, a slope of a concave pattern or a convex pattern adjacent to the inclined surface may be steeper than a slope of the inclined surface adjacent to the concave pattern or the convex pattern.

[0189] According to some embodiments of the present disclosure, the refractive index of the embankment layer may be smaller than that of the light-emitting layer, the refractive index of the foreign matter covering layer may be smaller than that of the first encapsulation layer, and the light-emitting layer, the second electrode and the first encapsulation layer may be arranged to correspond to a shape of a concave pattern or a convex pattern.

[0190] According to some embodiments of the present disclosure, the concave pattern or the convex pattern may have any one of a semicircle, a pattern having a concave or convex side surface, a triangle, and a trapezoid.

[0191] A light-emitting display device according to one embodiment of the present disclosure includes an outer coating layer including a base and a protrusion. The light-emitting display device also includes a first electrode, which is arranged to cover the base and the side of the protrusion. The light-emitting display device also includes a levee layer, which is on a portion of the first electrode. The light-emitting display device also includes a light-emitting layer, which is on the first electrode and the levee layer. The light-emitting display device also includes a second electrode, which is on the light-emitting layer. The levee layer includes: a first portion, which is on the protrusion; a second portion, which surrounds the first portion and includes an inclined upper surface; and a light extraction pattern, which is on the first portion adjacent to the second portion. The first electrode can be configured to reflect light emitted from the light-emitting layer toward the second electrode.

[0192] According to some embodiments of the disclosed content, the first electrode may include a reflective layer and the reflective layer may cover sides of the base and the protrusion.

[0193] According to some embodiments of the disclosed content, the light emitting layer may include a first protrusion pattern corresponding to the light extraction pattern of the bank layer; and the second electrode may include a second protrusion pattern corresponding to the first protrusion pattern.

[0194] According to some embodiments of the disclosed content, the light-emitting display device may also include an encapsulation layer on the second electrode, the light-emitting layer may include a first protruding pattern corresponding to the light extraction pattern of the embankment layer; and the second electrode may include a second protruding pattern corresponding to the first protruding pattern, and the encapsulation layer includes a third protruding pattern corresponding to the second protruding pattern.

[0195] It will be apparent to those skilled in the art that various modifications and variations may be made to the present disclosure without departing from the technical concept or scope of the present disclosure. Therefore, it is intended that the embodiments of the present disclosure cover modifications and variations of the present disclosure as long as they fall within the scope of the appended claims and their equivalents.

Claims

1. A light-emitting display device, comprising: an outer coating layer on the substrate and comprising a base portion and a protrusion; a first electrode disposed to cover the base and a side portion of the protrusion; a bank layer disposed on a portion of the first electrode and defining a light emitting region and a non-light emitting region; a light emitting layer on the first electrode and the bank layer; a second electrode on the light-emitting layer, and a packaging part including a foreign matter covering layer for planarizing an upper portion of the second electrode, and a first packaging layer between the second electrode and the foreign matter covering layer, Wherein, the bank layer comprises: a first portion on the protrusion; a second portion surrounding the first portion and comprising an inclined upper surface; and a light extraction pattern on the first portion adjacent to the second portion; The light emitting layer includes a first protruding pattern overlapping the light extraction pattern of the bank layer in the non-light emitting region; The second electrode includes a second protruding pattern overlapping the first protruding pattern in the non-light emitting area; The first encapsulation layer includes a third protruding pattern overlapping the second protruding pattern in the non-light emitting area; and The refractive index of the foreign matter covering layer is smaller than the refractive index of the first encapsulation layer.

2. The light-emitting display device according to claim 1, wherein: The light extraction pattern is disposed on the protrusion.

3. The light-emitting display device according to claim 1, wherein: The first electrode includes a reflective layer and is disposed between the protrusion and the light extraction pattern.

4. The light-emitting display device according to claim 1, wherein: The light extraction pattern protrudes from an upper surface of the first portion.

5. The light-emitting display device according to claim 4, wherein: The shape of the light extraction pattern has one of a semicircle, a convex pattern having a concave side surface, a triangle, and a trapezoid.

6. The light-emitting display device according to claim 4, wherein: A gradient of a tangent line of a portion of the light extraction pattern adjacent to the second portion is greater than a gradient of a tangent line of a portion of the second portion adjacent to the light extraction pattern.

7. The light-emitting display device according to claim 1, wherein: The light extraction pattern includes a concave pattern from an upper surface to an inner portion of the first portion.

8. The light-emitting display device according to claim 7, wherein: The shape of the light extraction pattern has one of a semicircle, the concave pattern having a convex side surface, a triangle, and a trapezoid.

9. The light-emitting display device according to claim 1, wherein: The light emitting layer and the second electrode are provided in a shape corresponding to the light extraction pattern.

10. The light-emitting display device according to claim 1, wherein: The first encapsulation layer is provided in a shape corresponding to the second electrode.

11. The light emitting display device according to claim 10, wherein: The refractive index of the bank layer is smaller than the refractive index of the light emitting layer.

12. A light-emitting display device, comprising: an outer coating layer on the substrate, comprising a base portion and a protrusion; a light emitting diode on the outer coating and comprising a first electrode, a light emitting layer, and a second electrode; A bank layer is provided between the first electrode and the light emitting layer and defines a light emitting area and a non-light emitting area; as well as an encapsulation part on the light emitting diode and including a foreign substance covering layer for planarizing an upper portion of the second electrode, a first encapsulation layer between the second electrode and the foreign substance covering layer, and a second encapsulation layer on the foreign substance covering layer, wherein the upper surface of the bank layer includes a concave pattern or a convex pattern on an inclined surface extending from the light emitting region, a planar surface spaced apart from the inclined surface, and a planar surface adjacent to the inclined surface, so as to improve light extraction efficiency and front efficiency for light emitted from the light emitting diode; The light emitting layer includes a first protruding pattern overlapping the light extraction pattern of the bank layer in the non-light emitting region; The second electrode includes a second protruding pattern overlapping the first protruding pattern in the non-light emitting area; The first encapsulation layer includes a third protruding pattern overlapping the second protruding pattern in the non-light emitting area; and The refractive index of the foreign matter covering layer is smaller than the refractive index of the first encapsulation layer.

13. The light emitting display device according to claim 12, wherein: The concave pattern or the convex pattern surrounds the light emitting area.

14. The light-emitting display device according to claim 12, wherein: The concave pattern or the convex pattern is provided on the protrusion and the first electrode.

15. The light emitting display device according to claim 12, wherein: A slope of the concave pattern or the convex pattern adjacent to the inclined surface is steeper than a slope of the inclined surface adjacent to the concave pattern or the convex pattern.

16. The light emitting display device according to claim 12, wherein: The refractive index of the bank layer is less than the refractive index of the light emitting layer; and The light emitting layer, the second electrode, and the first encapsulation layer are provided in a shape corresponding to the concave pattern or the convex pattern.

17. The light-emitting display device according to claim 12, wherein: The shape of the concave pattern or the convex pattern has one of a semicircle, a pattern having a concave side surface or a convex side surface, a triangle, and a trapezoid.

18. A light-emitting display device, comprising: an outer coating comprising a base portion and a projection portion; a first electrode disposed to cover the base and a side portion of the protrusion; a bank layer disposed on a portion of the first electrode and defining a light emitting region and a non-light emitting region; a light emitting layer on the first electrode and the bank layer; a second electrode on the light-emitting layer, and a packaging part including a foreign matter covering layer for planarizing an upper portion of the second electrode, and a first packaging layer between the second electrode and the foreign matter covering layer, Wherein, the bank layer comprises: a first portion on a protruding portion of the outer coating; a second portion surrounding the first portion and comprising an inclined upper surface; and a light extraction pattern on the first portion adjacent to the second portion; wherein the first electrode is configured to reflect light emitted from the light emitting layer toward the second electrode; The light emitting layer includes a first protruding pattern overlapping the light extraction pattern of the bank layer in the non-light emitting region; The second electrode includes a second protruding pattern overlapping the first protruding pattern in the non-light emitting area; The first encapsulation layer includes a third protruding pattern overlapping the second protruding pattern in the non-light emitting area; and The refractive index of the foreign matter covering layer is smaller than the refractive index of the first encapsulation layer.

19. The light emitting display device according to claim 18, wherein: The first electrode includes a reflective layer and the reflective layer covers the base and the side of the protrusion.

20. The light emitting display device according to claim 18, wherein: The first protruding pattern corresponds to the light extraction pattern of the bank layer; and The second protrusion pattern corresponds to the first protrusion pattern.

21. The light emitting display device according to claim 18, wherein: The first protruding pattern corresponds to the light extraction pattern of the bank layer; The second protruding pattern corresponds to the first protruding pattern; and The third protrusion pattern corresponds to the second protrusion pattern.

Images