Display device

Abstract

The invention relates to a display device. According to one aspect of the present disclosure, a display device includes: a substrate; an overcoat including a base and a protrusion; an anode; and a bank. The anode comprises a first part; a second portion; and a third portion, an edge of the second portion forming a first polygon on a plane. A virtual second polygon is defined that is congruent with the first polygon while sharing a center with the first polygon and is disposed on a plane with a smaller area than the first polygon. The first portion includes a protruding portion formed by an edge disposed on the outside of the second polygon on a plane and a recessed portion formed by an edge disposed on the inside of the second polygon on the plane, and an area of the protruding portion and an area of the recessed portion are equal to each other on the plane. And the third portion includes a recessed inclined portion corresponding to the protruding portion and having a recessed inclined surface and a protruding inclined portion corresponding to the recessed portion and having a protruding inclined surface.

Description

Technical Field

[0001] The present disclosure relates to a display device, and more specifically, for example but not limited to, a display device that increases the light extraction efficiency of light-emitting diodes of the same area. Background Art

[0002] Currently, with the advent of the full information age, the field of display devices for visually expressing electrical information signals has developed rapidly, and research is continuing to improve the performance of various display devices (e.g., thin thickness, light weight, and low power consumption).

[0003] Among various display devices, the display device is a self-emitting display device, and thus does not require a separate light source, which is different from liquid crystal display devices. Therefore, the display device can be manufactured to have a light weight and a thin thickness. In addition, since the light-emitting display device is driven at a low voltage, it is not only advantageous in terms of power consumption, but also in terms of color realization, response speed, viewing angle, and contrast ratio (CR). Therefore, the display device is expected to be used in various fields.

[0004] The description provided in the background art section should not be considered prior art merely because it is mentioned in or related to the background art section. The background art section may include information describing one or more aspects of the subject technology. Summary of the Invention

[0005] An object to be achieved by the present disclosure is to provide a display device with high efficiency and low power, which can improve the light-emitting efficiency of organic light-emitting diodes by using a side mirror-type anode.

[0006] Another object to be achieved by the present disclosure is to provide a display device with high efficiency and low power, which can improve the light extraction efficiency of light-emitting diodes of the same area.

[0007] The objects of the present disclosure are not limited to the above objects, and those skilled in the art can clearly understand other objects not mentioned above from the following description.

[0008] According to one aspect of the present disclosure, a display device includes: a substrate including a plurality of sub-pixels; an outer coating disposed on the substrate and including a base portion and a protrusion, the protrusion being disposed on the base portion and having an inclined side surface; an anode disposed corresponding to each of the plurality of sub-pixels and covering a part of the base portion and the protrusion; and a bank disposed on a part of the anode. The anode includes: a first portion disposed on a top surface of the base portion and exposed from the bank; a second portion disposed on the top surface of the base portion and covered by the bank; and a third portion disposed on a side surface of the protrusion, an edge of the second portion forming a first polygon in a plane. When a virtual second polygon congruent with the first polygon and sharing a center with the first polygon and having a smaller area than the first polygon in the plane is defined, the first portion includes a protrusion formed by an edge disposed more externally than the second polygon in the plane and a recess formed by an edge disposed more internally than the second polygon in the plane, an area of the protrusion and an area of the recess being equal to each other in the plane, and the third portion includes a recessed inclined portion corresponding to the protrusion and having a recessed inclined surface and a protruding inclined portion corresponding to the recess and having a protruding inclined surface.

[0009] Other details of the exemplary embodiments are included in the detailed description and the drawings.

[0010] According to the present disclosure, using a side mirror type anode can improve the light extraction efficiency of a light-emitting display device and can improve power consumption.

[0011] According to the present disclosure, while maintaining the area of a light-emitting region, the light extraction efficiency of light-emitting diodes of the same area can be increased by only increasing the length of a boundary line.

[0012] The effects according to the present disclosure are not limited to the above-exemplified contents, and more different effects are included in this specification.

[0013] It should be understood that the foregoing general description and the following detailed description are both exemplary and explanatory and are intended to provide further explanation of the claimed inventive concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The included drawings are used to provide further understanding of the present disclosure and are incorporated into this application and constitute a part of this application. The drawings illustrate embodiments of the present disclosure and, together with the specification, are used to explain the principles of the present disclosure. From the following detailed description in conjunction with the drawings, the above and other aspects, features, and other advantages of the present disclosure will be more clearly understood, wherein:

[0015] Figure 1 is a plan view of a display device according to an exemplary embodiment of the present disclosure;

[0016] Figure 2 isFigure 1 An enlarged plan view of region A;

[0017] Figure 3 is a cross-sectional view of a display device taken along line B - B' of Figure 2 ;

[0018] Figure 4 is a cross-sectional view of a display device taken along line C - C' of Figure 2 ;

[0019] Figure 5 is a plan view of a display device according to another exemplary embodiment of the present disclosure;

[0020] Figure 6 is a cross-sectional view of a display device taken along line D - D' of Figure 5 ;

[0021] Figure 7 is a plan view of a display device according to yet another exemplary embodiment of the present disclosure;

[0022] Figure 8 is a plan view of a display device according to yet another exemplary embodiment of the present disclosure; and

[0023] Figure 9 is a plan view of a display device according to yet another exemplary embodiment of the present disclosure.

[0024] Throughout the drawings and the detailed description, unless otherwise specified, the same reference numerals should be understood to represent the same elements, features, and structures. For clarity, illustration, and convenience, the relative sizes of these elements may be exaggerated and described. Detailed Embodiments

[0025] Now, embodiments of the present disclosure will be described in detail, examples of which can be shown in the drawings. In the following description, when the detailed description of well-known functions or configurations related to this document unnecessarily obscures the gist of the inventive concept, the detailed description thereof will be omitted. The progress of the described processing steps and / or operations is only an example; however, the order of the steps and / or operations is not limited to the order set forth herein and may be changed as known in the art, except for steps and / or operations that must occur in a specific order. The names of the respective elements used in the following description may be selected only for the convenience of writing the specification and may thus be different from the names used in actual products.

[0026] Advantages and features of the present disclosure, and methods for realizing these advantages and features, will become clear by referring to the exemplary embodiments described in detail below in conjunction with the accompanying drawings. 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 by way of example, so that those skilled in the art can fully understand the disclosure content of the present disclosure and the scope of the present disclosure. In addition, the present disclosure is only defined by the scope of the claims.

[0027] The shapes (e.g., size, length, width, height, thickness, position, radius, diameter, and area), ratios, angles, quantities, etc. shown in the accompanying drawings for describing the exemplary embodiments of the present disclosure are only examples, and the present disclosure is not limited thereto. Throughout the specification, the same reference numerals generally denote the same elements. In addition, in the following description of the present disclosure, detailed explanations of known related technologies may be omitted to avoid unnecessarily obscuring the subject matter of the present disclosure. Terms such as "including", "having", "consisting of", etc. used herein generally intend to allow the addition of other components, unless these terms are used together with the term "only". Any reference to the singular also includes the plural unless otherwise explicitly stated.

[0028] The term "exemplary" is used to mean as an example or illustration. An aspect is an example aspect. "Embodiment", "example", "aspect", etc. should not be construed as being more preferred or more advantageous than other implementations. Unless otherwise stated, an embodiment, an example, an exemplary embodiment, an aspect, etc. may refer to one or more embodiments, one or more examples, one or more exemplary embodiments, one or more aspects, etc. In addition, the term "may" includes all meanings of the term "can".

[0029] The term "or" means "inclusive or", rather than "exclusive or". That is, unless otherwise stated or clear from the context, the expression "x uses a or b" means any natural inclusive arrangement. For example, "a or b" may mean "a", "b", or "a and b". For example, "a, b, or c" may mean "a", "b", "c", "a and b", "b and c", "a and c", or "a, b, and c".

[0030] Even if not explicitly stated, components are interpreted to include a normal error range. As an example, the terms "equal to" or "the same as" used herein may include cases where the items being compared are slightly different from each other. Any implementation described herein as an "example" is not necessarily construed as being more preferred or more advantageous than other implementations.

[0031] When terms such as "above", "over", "under", "beside", etc. are used to describe the positional relationship between two components, unless these terms are used together with the terms "immediately" or "directly", one or more components may be located between these two components.

[0032] When an element or layer is disposed "above" another element or layer, the one element or layer may be directly disposed above the other element or layer, or another element or layer may be interposed therebetween.

[0033] Terms such as "under", "lower", "above", "upper", etc. may be used herein to describe the relationship between elements shown in the drawings. It should be understood that these terms are spatially relative and are based on the orientation shown in the drawings.

[0034] When describing temporal relationships, for example, when describing a temporal sequence as, for example, "after", "subsequently", "next", and "before", discontinuous cases may be included unless more restrictive terms such as "just", "immediately", or "directly" are used.

[0035] Although terms such as "first", "second", "A", "B", "(a)", and "(b)" 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. Thus, the first component to be mentioned below may be the second component in the technical concept of the present disclosure.

[0036] The term "at least one" should be understood to include any combination and all combinations of one or more of the associated listed items. For example, the meaning of "at least one of the first element, the second element, and the third element" encompasses the combination of all three listed elements, any combination of any two of the three elements, and each individual element (i.e., the first element, the second element, or the third element).

[0037] Throughout the specification, the same reference numerals generally denote the same elements.

[0038] For ease of description, the dimensions and thicknesses of each component shown in the drawings are shown, and the present disclosure is not limited to the dimensions and thicknesses of the components shown.

[0039] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the exemplary embodiments belong. It should also be understood that terms (e.g., terms defined in a commonly used dictionary) should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless explicitly defined herein. For example, the term "component" or "unit" can be applied to, for example, a separate circuit or structure, an integrated circuit, a computing block of a circuit device, or any structure configured to perform the described functions that would be understood by one of ordinary skill in the art.

[0040] The features of the various embodiments of the present disclosure can be partially or fully combined or combined with each other, and can be interlocked and operated in various ways technically, and these embodiments can be implemented independently or in association with each other.

[0041] Hereinafter, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0042] Figure 1 is a plan view of a display device according to an exemplary embodiment of the present disclosure.

[0043] Referring to Figure 1 , the display device 100 includes a substrate 110. The display device 100 can be implemented as a top-emitting display device, but is not limited thereto. As an example, the display device 100 can be implemented as a bottom-emitting display device or a dual-emitting display device, but is not limited thereto.

[0044] The substrate 110 is a substrate that supports and protects a plurality of components of the display device 100. The substrate 110 can be formed of a rigid material or a flexible material. As an example, the substrate 110 can be formed of a flexible glass or plastic material, but is not limited thereto. When the substrate 110 is formed of a plastic material, for example, the substrate can be formed of polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), etc., but is not limited thereto.

[0045] The substrate 110 includes a display area A / A and a non-display area N / A.

[0046] The display area A / A is an area where an image is displayed in the display device 100, and display elements and various driving elements for driving the display elements can be provided in the display area A / A. For example, the display element can be composed of a light-emitting diode including a first electrode, an organic layer, and a second electrode. In addition, various driving elements for driving the display elements, such as transistors, capacitors, or wirings, can be provided in the display area A / A.

[0047] A plurality of sub-pixels SP may be included in the display area A / A. A sub-pixel SP is the smallest unit that constitutes the screen, and each of the plurality of sub-pixels SP may include a light-emitting diode and a driving circuit. The plurality of sub-pixels SP may respectively emit light having different wavelengths. As an example, the plurality of sub-pixels may include a first sub-pixel to a third sub-pixel that emit light of different colors. For example, the plurality of sub-pixels SP may include a red sub-pixel SPR as the first sub-pixel, a green sub-pixel SPG as the second sub-pixel, and a blue sub-pixel SPB as the third sub-pixel. In addition, the plurality of sub-pixels SP may further include a white sub-pixel. The embodiments are not limited thereto. As an example, alternatively or additionally, sub-pixels of other colors such as cyan, magenta, or yellow may be included. As an example, the plurality of sub-pixels may include more than three sub-pixels that emit light of different colors.

[0048] The driving circuit of the sub-pixel SP is a circuit for controlling the driving of the light-emitting diode. For example, the driving circuit may be configured to include a transistor and a capacitor, but is not limited thereto.

[0049] The non-display area N / A is an area where an image is not displayed, and various components for driving the plurality of sub-pixels SP provided in the display area A / A may be provided in the non-display area N / A. For example, a driving IC, a flexible film, etc. that provide signals for driving the plurality of sub-pixels SP may be provided, but are not limited thereto.

[0050] As Figure 1 shown, the non-display area N / A may be an area surrounding the display area A / A. However, the present disclosure is not limited thereto. For example, the non-display area N / A may be an area extending from the display area A / A. As an example, the non-display area N / A may be adjacent to the display area A / A. As an example, the non-display area N / A may partially or completely surround the display area A / A. As an example, at least a part of the non-display area N / A may be invisible from the front side of the display device, for example, by bending toward the rear side of the display device, but is not limited thereto.

[0051] Figure 2 is Figure 1 an enlarged plan view of area A. Figure 3 is Figure 2 a cross-sectional view of the display device taken along line B-B’. Figure 4 is Figure 2 a cross-sectional view of the display device taken along line C-C’. For ease of description, in Figure 2 only the first electrode 161 provided in one sub-pixel SPR among the various components of the display device 100 is shown. Figure 3 is a cross-sectional view of the area provided with the protrusion PP of the first electrode 161 and the recessed inclined portion 161c1, andFigure 4 It is a cross-sectional view of a region provided with a recessed portion DP having a first electrode 161 and a protruding inclined portion 161c2. Meanwhile, in Figure 2 , for ease of description, the recessed inclined portion 161c1 and the protruding inclined portion 161c2 are shown with different hatching, but the recessed inclined portion 161c1 and the protruding inclined portion 161c2 may be integrally provided using the same material. However, the above components are not limited thereto. As an example, the recessed inclined portion 161c1 and the protruding inclined portion 161c2 may be provided using different materials, but are not limited thereto.

[0052] Referring to Figures 2 to 4 , the display device 100 includes a substrate 110, a transistor 120, a first outer coating 130, an auxiliary electrode 140, a second outer coating 150, a light-emitting diode 160, a bank 170, and a packaging unit 180. The embodiments are not limited thereto. As an example, one or more of the above components may be omitted, and / or one or more additional components may be further included.

[0053] A buffer layer 111 is provided on the substrate 110. The buffer layer 111 can be used to improve the adhesion between the layer formed on the buffer layer 111 and the substrate 110, and to block alkaline components leaking 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 multi-layer of silicon nitride (SiNx) and silicon oxide (SiOx), but is not limited thereto. The buffer layer 111 is not an essential component, and may be omitted based on the type or material of the substrate 110 and the structure and type of the transistor 120.

[0054] The transistor 120 is provided on the buffer layer 111. The transistor 120 can be used as a driving element for driving the light-emitting diode 160 in the display area A / A. The transistor 120 includes an active layer 121, a gate 122, a source 123, and a drain 124. Figure 2 The transistor 120 shown is a driving transistor and is a top-gate thin-film transistor with the gate 122 disposed above the active layer 121. However, the embodiments are not limited thereto, and the transistor 120 may be implemented as a bottom-gate transistor.

[0055] The active layer 121 is provided on the buffer layer 111. The active layer 121 is a region where a channel is formed when driving the transistor 120. The active layer 121 may be formed of an oxide semiconductor and amorphous silicon (a-Si) semiconductor, polycrystalline silicon (poly-Si) semiconductor, compound semiconductor, or organic semiconductor, but is not limited thereto.

[0056] 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 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 multi-layer of silicon nitride (SiNx) or silicon oxide (SiOx), but is not limited thereto.

[0057] In the gate insulating layer 112, contact holes are formed, and the source electrode 123 and the drain electrode 124 are in contact with the source region and the drain region of the active layer 121 through the contact holes. As Figure 2 shown, the gate insulating layer 112 may be formed on the entire surface of the substrate 110, or may be patterned, for example, to have the same width as the gate 122 or the active layer 121 or a width greater than that of the gate 122 or the active layer 121, but is not limited thereto.

[0058] The gate 122 is disposed on the gate insulating layer 112. The gate 122 is disposed on the gate insulating layer 112 to overlap with the channel region of the active layer 121. The gate 122 may be any one of various metal materials such as molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy of two or more of the above materials or a multi-layer thereof, but is not limited thereto.

[0059] The interlayer insulating layer 113 is disposed on the gate 122. 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 multi-layer 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 in contact with the source region and the drain region of the active layer 121 through the contact holes.

[0060] 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 and spaced apart from each other, but are not limited thereto. The source electrode 123 and the drain electrode 124 are electrically connected to the active layer 121 through the contact holes of the gate insulating layer 112 and the interlayer insulating layer 113. The source electrode 123 and the drain electrode 124 may be any one of various metal materials such as molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy of two or more of these materials or a multi-layer thereof, but is not limited thereto.

[0061] In Figure 3 only the driving transistor among the various transistors 120 included in the display device 100 is shown, but other transistors such as switching transistors may also be provided.

[0062] A first outer coating 130 is disposed on the interlayer insulating layer 113 and the transistor 120. The first outer coating 130 is an insulating layer that protects the transistor 120 and planarizes the upper portion of the transistor 120. A contact hole exposing the source electrode 123 of the transistor 120 is formed in the first outer coating 130. Although in Figure 3 it is shown that the contact hole exposing the source electrode 123 is formed in the first outer coating 130, it is not limited thereto. For example, a contact hole exposing the drain electrode 124 may be formed in the first outer coating 130.

[0063] The first outer coating 130 may be formed of one of an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, a polyimide resin, an unsaturated polyester resin, a polystyrene resin, a polyphenylene sulfide resin, a benzocyclobutene, and a photoresist, but is not limited thereto.

[0064] As an example, a passivation layer covering the interlayer insulating layer 113 and the transistor 120 may also be disposed under the first outer coating 130. The passivation layer may be formed as a single layer of silicon nitride (SiNx) or silicon oxide (SiOx) or a multi-layer of silicon nitride (SiNx) or silicon oxide (SiOx), but is not limited thereto. For example, the passivation layer may be omitted according to the design.

[0065] An auxiliary electrode 140 is disposed on the first outer coating 130. The auxiliary electrode 140 may be used to electrically connect the transistor 120 and the light emitting diode 160. The auxiliary electrode 140 is electrically connected to the source electrode 123 of the transistor 120 through a contact hole formed in the first outer coating 130. The auxiliary electrode 140 may be formed of a single layer or a multi-layer formed of any one of molybdenum (Mo), copper (Cu), titanium (Ti), aluminum (Al), chromium (Cr), gold (Au), nickel (Ni), and neodymium (Nd) or an alloy thereof. As an example, the auxiliary electrode 140 may be omitted according to the design. In this case, the light emitting diode 160 may be directly connected to the source electrode 123 of the transistor 120, but is not limited thereto.

[0066] A second outer coating 150 is disposed on the first outer coating 130. The second outer coating 150 is an insulating layer for planarizing the upper portion of the first outer coating 130 and the upper portion of the auxiliary electrode 140. A contact hole exposing the auxiliary electrode 140 is formed in the second outer coating 150.

[0067] The second outer coating 150 may be formed of one of an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, a polyimide resin, an unsaturated polyester resin, a polystyrene resin, a polyphenylene sulfide resin, a benzocyclobutene, and a photoresist, but is not limited thereto.

[0068] The second outer coating 150 includes a base portion 151 and a plurality of protrusions 152. As Figure 3As shown, the base 151 and the plurality of protrusions 152 may be integrally formed. For example, the base 151 and the plurality of protrusions 152 are formed of the same material and are formed simultaneously by the same process (e.g., by a mask process), but are not limited thereto. As an example, the second outer coating 150 may include the plurality of protrusions 152 and the base 151 in the vertical direction. As an example, the base 151 and the plurality of protrusions 152 may be formed of different materials, but are not limited thereto.

[0069] The base 151 is disposed on the first outer coating 130. As an example, the top surface of the base 151 is parallel to the surface of the substrate 110, but is not limited thereto. Thus, as an example, the step generated by the components disposed therebelow may be flattened by the base 151.

[0070] The plurality of protrusions 152 are disposed on the base 151. The plurality of protrusions 152 are integrally formed with the base 151 to protrude from the base 151. However, the embodiments are not limited thereto, and the plurality of protrusions 152 may be separately formed from the base 151. As an example, after forming the base 151 having a flat top surface, the plurality of protrusions 152 may be separately formed on the top surface of the base 151. As an example, the top surface of the plurality of protrusions 152 may be smaller than the bottom surface, but is not limited thereto.

[0071] Each of the plurality of protrusions 152 includes a top surface and a side surface. The top surface of the protrusion 152 is the surface located at the uppermost part of the protrusion 152 and may be substantially parallel to the surface of the base 151 or the substrate 110. The side surface of the protrusion 152 may be the surface connecting the top surface of the protrusion 152 and the base 151. As an example, at least one or all of the side surfaces of the plurality of protrusions 152 may be inclined with respect to the base 151.

[0072] The light emitting diode 160 is disposed on the second outer coating 150.

[0073] The light emitting diode 160 includes a first electrode 161 electrically connected to the source electrode 123 of the transistor 120, an organic layer 162 disposed on the first electrode 161, and a second electrode 163 formed on the organic layer 162.

[0074] The first electrode 161 is provided to correspond to each of the plurality of sub-pixels SP. The first electrode 161 is provided to cover at least a part of the plurality of protrusions 152 and the base 151. The first electrode 161 may be provided along the shape of the base 151 of the outer coating and the plurality of protrusions 152. Specifically, the first electrode 161 may be provided on the top surface of the base 151 where the protrusions 152 are not provided and on the side surfaces of the plurality of protrusions 152. As an example, the first electrode 161 is provided along the shape of the base 151 and the protrusions 152. In addition, as an example, the first electrode 161 may also be formed on a partial area of the top surface and the side surfaces of the plurality of protrusions 152.

[0075] The first electrode 161 may be the anode of the light-emitting diode 160. The first electrode 161 is electrically connected to the auxiliary electrode 140 through a contact hole formed in the second outer coating 150. The first electrode 161 may be electrically connected to the source 123 of the transistor 120 through the auxiliary electrode 140. However, depending on the type of the transistor 120 and the design of the driving circuit, the first electrode 161 may be configured to be electrically connected to the drain 124 of the transistor 120.

[0076] Each of the plurality of sub-pixels SP includes a light-emitting region and a non-light-emitting region that partially or completely surrounds the light-emitting region. The first electrode 161 includes a first portion 161a, a second portion 161b, a third portion 161c, and a fourth portion 161d. At this time, the light-emitting region and the non-light-emitting region may be defined by each portion of the first electrode 161.

[0077] For example, the light-emitting region includes a first light-emitting region and a second light-emitting region surrounding the first light-emitting region, and the non-light-emitting region includes a first non-light-emitting region located between the first light-emitting region and the second light-emitting region and a second non-light-emitting region surrounding the second light-emitting region. At this time, the first light-emitting region may correspond to the first portion 161a, the first non-light-emitting region may correspond to the second portion 161b, the second light-emitting region may correspond to the third portion 161c, and the second non-light-emitting region may correspond to the fourth portion 161d.

[0078] The first portion 161a is provided on the top surface of the base 151, and the top surface of the first electrode 161 is exposed from the bank 170. The first portion 161a may be a portion corresponding to an area where a part of the light emitted from the organic layer 162 in the sub-pixel SP is extracted to the outside of the display device 100 via the organic layer 162 and the second electrode 163.

[0079] Referring to Figure 2 , the first portion 161a may include a protrusion PP and a depression DP.

[0080] The protruding portion PP is a portion whose area increases outwardly toward the outside of the first portion 161a on a plane, and the recessed portion DP is a portion whose area decreases inwardly toward the inside of the first portion 161a on a plane. As an example, the area of the protruding portion PP and the area of the recessed portion DP are substantially equal to each other, or may be different from each other. As an example, the first portion 161a is provided with a portion whose area decreases inwardly, and the area of this portion is the same as the area of the portion whose area increases outwardly on the plane. For example, the planar shape of the first portion 161a may be a plurality of circles or curved sawteeth as shown in Figure 2 but is not limited thereto. As an example, with respect to the reference line from which the protruding portion PP protrudes and the recessed portion DP recesses, the protruding portion PP and the recessed portion DP may have the same shape, and / or may have the same area. The embodiment is not limited thereto. As an example, with respect to the reference line, the protruding portion PP and the recessed portion DP may have different shapes, and / or may have different areas.

[0081] For example, the planar shape of the second portion 161b surrounding the first portion 161a has a polygonal shape, and a virtual polygon VL is defined, which is congruent to the polygonal shape of the second portion 161b and shares a center with the polygonal shape of the second portion 161b on the plane, and is set to have an area smaller than the area of the polygonal shape of the second portion 161b. In this case, the protruding portion PP is a portion formed by the edge of the first portion 161a provided outside the virtual polygon VL, and the recessed portion DP is a portion formed by the edge of the first portion 161a provided inside the virtual polygon VL. That is, the protruding portion PP is a portion whose area increases from the virtual polygon VL, and the recessed portion DP is a portion whose area decreases from the virtual polygon VL. The area of the protruding portion PP and the area of the recessed portion DP may be equal to each other. Therefore, as an example, on the plane, the same area of the first portion 161a increases or decreases, so that the first portion 161a finally including the protruding portion PP and the recessed portion DP may have the same area as the virtual polygon VL. The embodiment is not limited thereto. As an example, the area of the protruding portion PP and the area of the recessed portion DP may be different from each other. As an example, the area of the protruding portion PP may be larger or smaller than the area of the recessed portion DP. As an example, the area of the first portion 161a may be different from (e.g., larger or smaller than) the area of the virtual polygon VL, but is not limited thereto.

[0082] The first portion 161a may be surrounded by the second portion 161b. The second portion 161b is a portion where the first electrode 161 provided on the top surface of the base 151 is covered by the bank 170. Refer to Figure 2 , the edge of the second portion 161b is set to form a polygon on the plane. The second portion 161b is provided with a polygonal shape including a plurality of sides on the plane.

[0083] Meanwhile, on the plane, each edge of the second portion 161b is set to have a portion parallel to the virtual polygon VL defined above. That is, each edge of the second portion 161b is set to correspond to either the protrusion PP or the recess DP.

[0084] Referring to Figure 2 , in the second portion 161b, the area of the portion corresponding to the protrusion PP is smaller than the area of the portion corresponding to the recess DP. That is, the second portion 161b can be set to have a portion with an area reduced as much as the area of the protrusion PP and a portion with an area increased as much as the area of the recess DP on the plane.

[0085] The second portion 161b can be a portion corresponding to an area where some of the light emitted from the organic layer 162 in the sub-pixel SP reaches the bank 170 such that the light is not extracted to the outside of the display device 100. When the display device 100 is in the on state, the area corresponding to the second portion 161b in the sub-pixel SP can be in a black state or have a lower luminance than the luminance in the light-emitting area.

[0086] The second portion 161b can be surrounded by a third portion 161c. The third portion 161c is a portion where the first electrode 161 is disposed on the inclined surface of the protrusion 152. The third portion 161c can correspond to an area where some of the light emitted from the organic layer 162 in the sub-pixel SP is reflected by the first electrode 161 disposed on the inclined surface of the protrusion 152 to be extracted to the outside of the display device 100.

[0087] Meanwhile, referring to Figure 2 , the edge of the third portion 161c is set to form a polygon on the plane. The third portion 161c is set to have a polygonal shape with multiple sides on the plane. On the plane, each edge of the third portion 161c is set to have a portion parallel to the virtual polygon VL and the edge of the second portion 161b defined above. That is, each edge of the third portion 161c is set to correspond to either the protrusion PP or the recess DP. The embodiment is not limited thereto. As an example, the edge of the third portion 161c can be set to form a shape other than a polygon (e.g., a circle) on the plane. As an example, the edge of the third portion 161c can be set to have a portion not parallel to the virtual polygon VL and the edge of the second portion 161b defined above, but it is not limited thereto.

[0088] Referring to Figure 3 and Figure 4 , the third portion 161c includes a concave inclined portion 161c1 and a convex inclined portion 161c2.

[0089] The recessed inclined portion 161c1 is provided to correspond to the protruding portion PP. As Figure 3 shown, the farther away from the top surface of the protrusion 152, the smaller the inclination angle of the recessed inclined portion 161c1.

[0090] The protruding inclined portion 161c2 is provided to correspond to the recessed portion DP. As Figure 4 shown, the farther away from the top surface of the protrusion 152, the larger the inclination angle of the protruding inclined portion 161c2.

[0091] Meanwhile, referring to Figure 3 and Figure 4 , the volume of the bank 170 provided on the recessed inclined portion 161c1 is larger than the volume of the bank 170 provided on the protruding inclined portion 161c2. That is to say, the path for the light emitted from the organic layer 162 to reach the recessed inclined portion 161c1 can be longer than the path for the light to reach the protruding inclined portion 161c2.

[0092] The third portion 161c can be surrounded by the fourth portion 161d. The fourth portion 161d is the portion where the first electrode 161 is provided on a part of the flat top surface of the protrusion 152. When the display device 100 is in the on state, the fourth portion 161d is in a black state in the sub-pixel SP or has a lower brightness than the brightness in the light-emitting region due to the light incident from the light-emitting region, but is not limited thereto.

[0093] As an example, the fourth portion 161d can be the region where the components for driving the light-emitting diode 160 are provided, but is not limited thereto. For example, in the fourth portion 161d of the first electrode 161, there can be provided contact holes through which the first electrode 161 and the transistor 120 are connected, but is not limited thereto. As an example, the contact holes through which the first electrode 161 and the transistor 120 are connected can be provided in the fourth portion 161d. As an example, the components for driving the light-emitting diode 160 can overlap or not overlap with the fourth portion 161d. As an example, the width of the fourth portion 161d can be smaller than, equal to, or larger than the width of at least one or each of the third portion 161c, the second portion 161b, and the first portion 161a, but is not limited thereto. As an example, according to the design, the fourth portion 161d can be omitted.

[0094] Although in Figure 3In [the figure], the first electrode 161 is shown as a single layer, but the first electrode 161 may be configured as a multi-layer. For example, the first electrode 161 may include a reflective layer that reflects light emitted from the organic layer 162 toward the second electrode 163 and a transparent conductive layer that supplies holes to the organic layer 162, but is not limited thereto. As an example, the first portion 161a, the second portion 161b, the third portion 161c, and the fourth portion 161d may have the same layer or different layers. As an example, the first portion 161a may have a reflective layer and a transparent conductive layer, while the third portion 161c may have only a reflective layer, but is not limited thereto.

[0095] The reflective layer is disposed on the second outer coating 150 to reflect upward the light emitted from the light-emitting diode 160. The light generated in the organic layer 162 of the light-emitting diode 160 can be emitted not only upward but also laterally and downward. The laterally or downward-emitted light is directed inside the display device 100, or is trapped in the display device 100 due to total reflection, or further travels inside the display device 100 and then disappears. Therefore, the reflective layer is disposed below the organic layer 162 to cover the sides of the plurality of protrusions 152, thereby changing the traveling direction of the light directed to the sides of the organic layer 162 to the front surface direction.

[0096] As an example, 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.

[0097] 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 supply holes to the organic layer 162, but is not limited thereto. 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.

[0098] The bank 170 may be formed of an inorganic material. For example, the bank 170 may be formed of a single layer of silicon nitride (SiNx) or silicon oxide (SiOx), or a multi-layer of silicon nitride (SiNx) and silicon oxide (SiOx). However, the embodiments are not limited thereto, and the bank 170 may be formed of an organic material.

[0099] The organic layer 162 is disposed on the first electrode 161. As an example, the organic layer 162 may also be disposed on the bank 170, but is not limited thereto. For example, the organic layer 162 is disposed on the first electrode 161 in the light-emitting region and on the bank 170 in the non-light-emitting region. The organic layer 162 may be disposed along the shapes of the first electrode 161 and the bank 170. The organic layer 162 includes a light-emitting layer or may also include a common layer, but is not limited thereto.

[0100] The light-emitting layer is an organic layer that emits light of a specific color. Different light-emitting layers can be respectively provided in a plurality of sub-pixels SP, or the same light-emitting layer can be provided in all of the plurality of sub-pixels SP. For example, when different light-emitting layers are respectively provided in a plurality of sub-pixels SP, a red light-emitting layer can be provided in a red sub-pixel SPR, a green light-emitting layer can be provided in a green sub-pixel SPG, and a blue light-emitting layer can be provided in a blue sub-pixel SPB. When the same light-emitting layer is provided in all of the plurality of sub-pixels SP, the light from the light-emitting layer can be converted into light of various colors through a separate light conversion layer, a color filter, etc.

[0101] As an example, the common layer is an organic layer that is provided to improve the light-emitting efficiency of the light-emitting layer, but is not limited thereto. The common layer can be formed as the same layer above a plurality of sub-pixels SP. That is, the common layers of the plurality of sub-pixels SP can be formed simultaneously from the same material through the same process. The common layer can include a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, and / or a charge generation layer, but is not limited thereto.

[0102] Alternatively, the organic layer 162 can be configured by stacking a plurality of light-emitting units each including a light-emitting layer and being configured to emit light. For example, each light-emitting unit includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer, and a charge generation layer that supplies charges to the plurality of light-emitting units is provided between adjacent light-emitting units. Therefore, in the organic layer 162, light can be emitted, and the light is a mixture of light emitted from each of the plurality of light-emitting units, but is not limited thereto. As an example, at least one of the hole injection layer, the hole transport layer, the electron transport layer, and the electron injection layer can be omitted in at least some of the plurality of light-emitting units.

[0103] The second electrode 163 is provided on the organic layer 162. The second electrode 163 can be provided along the shape of the organic layer 162. The second electrode 163 supplies electrons to the organic layer 162, such that the second electrode can be formed of a conductive material having a low work function, but is not limited thereto. The second electrode 163 can be the cathode of the light-emitting diode 160. The second electrode 163 can be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) or a metal alloy such as MgAg or ytterbium (Yb) alloy, and can also include a metal doping layer, but is not limited thereto. At the same time, even if not shown in the figure, the second electrode 163 is electrically connected to a low-potential power supply line to be supplied with a low-potential power signal.

[0104] The encapsulation unit 180 may be formed on the light-emitting diode 160 to protect the moisture-sensitive light-emitting diode 160 from being exposed to moisture. The encapsulation unit 180 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 area shrinks may occur, or dead pixels in the light-emitting area may be generated. Therefore, the encapsulation unit 180 blocks oxygen and moisture to protect the light-emitting display device 100. For example, the encapsulation unit 180 may have a structure in which inorganic layers and organic layers are alternately stacked, but is not limited thereto.

[0105] Referring to Figure 3 and Figure 4 , as an example, the encapsulation unit 180 may include a first encapsulation layer 181, a foreign matter outer coating 182, and a second encapsulation layer 183, but is not limited thereto. As an example, the encapsulation unit 180 may include fewer than three layers or more than three layers.

[0106] The first encapsulation layer 181 is disposed on the second electrode 163 to inhibit the penetration of moisture or oxygen. The first encapsulation layer 181 may be formed of an inorganic material such as silicon nitride (SiNx), silicon oxynitride (SiNxOy), or aluminum oxide (AlyOz), but is not limited thereto. As an example, the first encapsulation layer 181 may be formed of a material having a refractive index higher than that of the foreign matter outer coating 182, but is not limited thereto.

[0107] For example, the foreign matter outer coating 182 is disposed on the first encapsulation layer 181 to planarize the surface. In addition, the foreign matter outer coating 182 may cover foreign matters or particles that may be generated during the manufacturing process. The foreign matter outer coating 182 may be formed of an organic material such as silicon oxycarbide (SiOxCz), propylene, or epoxy resin, but is not limited thereto.

[0108] Similar to the first encapsulation layer 181, the second encapsulation layer 183 is disposed on the foreign matter outer coating 182 and may inhibit the penetration of moisture or oxygen. The second encapsulation layer 183 may be formed of an inorganic material such as silicon nitride (SiNx), silicon oxynitride (SiNxOy), silicon oxide (SiOx), or aluminum oxide (AlyOz), but is not limited thereto. The second encapsulation layer 183 may be formed of the same material as the first encapsulation layer 181 or a different material from the first encapsulation layer 181.

[0109] In a display device using a first electrode formed on an outer coating having a flat top surface, light emitted from the organic layer and emitted at a low emission angle is trapped and lost in the light-emitting display device due to total reflection loss or optical waveguide loss, resulting in a decrease in light-emitting efficiency. Therefore, an outer coating having protrusions is used and the first electrode is disposed on the inclined side surfaces of the protrusions to reflect the light emitted from the organic layer and extract the light to the outside of the display device, thereby improving the light extraction efficiency of the light-emitting diode.

[0110] Meanwhile, in a light-emitting region where the first electrode is exposed from the bank, the light-emitting efficiency can be concentrated in the boundary region between the light-emitting region and the bank. Therefore, in order to increase the length of the boundary region between the light-emitting region and the bank, it is also necessary to enlarge the size of the light-emitting region. However, due to the limitations of the resolution of the display device and the placement space, it is necessary to enlarge the size of the light-emitting region in a limited space.

[0111] In the display device 100 according to an exemplary embodiment of the present disclosure, protrusions PP and depressions DP are provided in a first portion 161a of the first electrode 161 such that the light extraction efficiency can be increased while maintaining the area of the light-emitting region.

[0112] Specifically, the first portion 161a corresponding to the light-emitting region includes a protrusion PP and a depression DP. In the light-emitting region, some light emitted from the organic layer 162 in the sub-pixel SP is extracted to the outside of the display device 100 via the organic layer 162 and the second electrode 163. The protrusion PP is a portion that extends outward in the plane toward the outside of the first portion 161a, and the depression DP is a portion that is recessed inward in the plane toward the inside of the first portion 161a. As an example, the area of the protrusion PP and the area of the depression DP may be equal to each other, such that the first portion 161a may be configured to extend or recess with the same area in the plane. Therefore, for the same area, the length of the edge of the first portion 161a can also be increased. As an example, the light-emitting region corresponding to the first portion 161a may be configured to increase only the length of the edge without increasing the area. Therefore, the boundary region between the light-emitting region and the bank where the light-emission efficiency is concentrated is also increased, so that the light extraction efficiency can be improved without increasing the area of the light-emitting region. Therefore, in the display device 100 according to an exemplary embodiment of the present disclosure, the protrusion PP and the depression DP are provided in the first portion 161a of the first electrode 161, so that the light extraction efficiency can be improved while maintaining the area of the light-emitting region. Although it is described that the area of the protrusion PP and the area of the depression DP may be equal to each other, the embodiment is not limited thereto. As an example, the area of the protrusion PP may be different from the area of the depression DP. Although a plurality of protrusions PP and a plurality of depressions DP are shown to exist along the edge of the light-emitting region, the embodiment is not limited thereto. As an example, there may be only a plurality of protrusions PP or only a plurality of depressions DP along the edge of the light-emitting region. For example, there may be at least one protrusion PP or at least one depression DP along the edge of the light-emitting region. Although a plurality of protrusions PP or a plurality of depressions DP are shown to be regularly distributed along the edge of the light-emitting region, the embodiment is not limited thereto. As an example, a plurality of protrusions PP or a plurality of depressions DP may be irregularly distributed along the edge of the light-emitting region. Although one protrusion PP and one depression DP are shown to be alternately arranged, the embodiment is not limited thereto. As an example, a plurality of protrusions PP or a plurality of depressions DP may be continuously arranged. Although the protrusion PP and the depression DP are shown to have a curved shape, the embodiment is not limited thereto. As an example, the protrusion PP or the depression DP may have an angular shape. Although a plurality of protrusions PP or a plurality of depressions DP are shown to have the same shape, they may also have different shapes.

[0113] Meanwhile, in the display device 100 according to an exemplary embodiment of the present disclosure, the recessed inclined portion 161c1 and the protruding inclined portion 161c2 corresponding to the protruding portion PP and the recessed portion DP are provided in the third portion 161c of the first electrode 161. Accordingly, at least some of the light reflected from the third portion 161c corresponding to the protruding portion PP and the light reflected from the third portion 161c corresponding to the recessed portion DP can be guided in the front surface direction.

[0114] Specifically, the second portion 161b corresponding to the protruding portion PP is provided to have an area smaller than the area of the second portion 161b corresponding to the recessed portion DP. Accordingly, the optical path of the light emitted from the organic layer 162 passing through the second portion 161b corresponding to the protruding portion PP can be shorter than the optical path of the light passing through the second portion 161b corresponding to the recessed portion DP. Accordingly, in the display device 100 according to an exemplary embodiment of the present disclosure, the recessed inclined portion 161c1 is provided in the third portion 161c corresponding to the protruding portion PP, and the protruding inclined portion 161c2 is provided in the third portion 161c corresponding to the recessed portion DP. Accordingly, the volume of the bank 170 provided on the recessed inclined portion 161c1 is larger than the volume of the bank 170 provided on the protruding inclined portion 161c2. Accordingly, the optical path of the light emitted from the organic layer 162 reaching the recessed inclined portion 161c1 can be shorter than, or can be equal to, or even longer than the optical path reaching the protruding inclined portion 161c2. Accordingly, the recessed inclined portion 161c1 and the protruding inclined portion 161c2 can be provided to compensate for the difference in the lengths of the optical paths passing through the second portion 161b corresponding to the protruding portion PP and the second portion 161b corresponding to the recessed portion DP. Accordingly, in the display device 100 according to an exemplary embodiment of the present disclosure, in the third portion 161c of the first electrode 161, the recessed inclined portion 161c1 and the protruding inclined portion 161c2 corresponding to the protruding portion PP and the recessed portion DP are provided. Accordingly, all of the light reflected from the third portion 161c corresponding to the protruding portion PP and the light reflected from the third portion 161c corresponding to the recessed portion DP can be guided in the front surface direction. The embodiment is not limited thereto. As an example, a flat inclined portion may be provided in one or both of the third portion 161c corresponding to the protruding portion PP and the third portion 161c corresponding to the recessed portion DP. As an example, a recessed inclined portion or a protruding inclined portion may be provided in both of the third portion 161c corresponding to the protruding portion PP and the third portion 161c corresponding to the recessed portion DP. As an example, the inclined portion provided in the third portion 161c corresponding to the protruding portion PP may be more recessed than the inclined portion provided in the third portion 161c corresponding to the recessed portion DP, but is not limited thereto.

[0115] Figure 5 is a plan view of a display device according to another exemplary embodiment of the present disclosure.Figure 6 is a cross-sectional view of a display device taken along line D-D’ of Figure 5 . For ease of description, in Figure 5 , only the first electrode 561 disposed in one sub-pixel SP among various components of the display device 500 is shown, and the fourth part 161d of the first electrode 561 is omitted. Figure 6 is a cross-sectional view of a region provided with the flat inclined portion 561c3 of the first electrode 561. Meanwhile, in Figure 5 , for ease of description, the recessed inclined portion 161c1, the protruding inclined portion 161c2, and the flat inclined portion 561c3 are shown with different hatches. However, the recessed inclined portion 161c1, the protruding inclined portion 161c2, and the flat inclined portion 561c3 may be integrally provided using the same material, but it is not limited thereto. Figure 5 the only difference between the display device 500 of Figures 1 to 4 and the display device 100 of

[0116] is the shape of the first part 561a and the placement of the flat inclined portion 561c3, but other configurations are basically the same, so redundant descriptions will be omitted or briefly given. Figure 5 Referring to Figure 5 , on a plane, the protrusion PP and the depression DP are not provided in a part of the edge of the first part 561a. That is, the first part 561a may have a portion overlapping the above virtual polygon VL on the plane. For example, the planar shape of the first part 561a may be a shape including square serrations as shown in

[0117] Referring to Figure 5 and Figure 6 , in the display device 500 according to another exemplary embodiment of the present disclosure, the third part 561c of the first electrode 561 of the light-emitting diode 560 may further include a flat inclined portion 561c3.

[0118] The flat inclined portion 561c3 is a portion provided corresponding to the edge of the first part 561a where the protrusion PP and the depression DP are not provided. The flat inclined portion 561c3 is provided with a flat inclined surface.

[0119] Meanwhile, referring back to Figure 3 , Figure 4 and Figure 6, the volume of the bank 170 provided on the flat inclined portion 561c3 is smaller than the volume of the bank 170 provided on the recessed inclined portion 161c1 and larger than the volume of the bank 170 provided on the protruding inclined portion 161c2. As an example, the optical path of the light emitted from the organic layer 162 to reach the flat inclined portion 561c3 may be shorter than the optical path to reach the recessed inclined portion 161c1. As an example, the optical path of the light emitted from the organic layer 162 to reach the flat inclined portion 561c3 may be longer than the optical path to reach the protruding inclined portion 161c2. The embodiment is not limited thereto. As an example, the optical path of the light emitted from the organic layer 162 to reach the flat inclined portion 561c3 may be longer than, equal to, or even shorter than the optical path to reach the recessed inclined portion 161c1, but is not limited thereto. As an example, the optical path of the light emitted from the organic layer 162 to reach the flat inclined portion 561c3 may be shorter than, equal to, or even longer than the optical path to reach the protruding inclined portion 161c2, but is not limited thereto.

[0120] Therefore, in the display device 500 according to another exemplary embodiment of the present disclosure, in the third portion 561c of the first electrode 561, there are provided a recessed inclined portion 161c1, a protruding inclined portion 161c2, and a flat inclined portion 561c3 corresponding to the protruding portion PP, the recessed portion DP, and the portion where neither the protruding portion PP nor the recessed portion DP is provided, respectively. Therefore, the light reflected from the third portion 161c corresponding to the protruding portion PP, the light reflected from the third portion 561c corresponding to the recessed portion DP, and the light reflected from the third portion 561c corresponding to the portion where neither the protruding portion PP nor the recessed portion DP is provided can all be guided to the front surface direction.

[0121] Specifically, the second part 161b corresponding to the protrusion PP is set to have an area smaller than the area of the second part 161b corresponding to the recess DP. The second part 161b corresponding to the part where neither the protrusion PP nor the recess DP is provided is set to have an area larger than the area of the second part 161b corresponding to the protrusion PP and is set to have an area smaller than the area of the second part 161b corresponding to the recess DP. Accordingly, the optical path through which the light emitted from the organic layer 162 passes through the second part 161b corresponding to the protrusion PP can be shorter than the optical path through which the light passes through the second part 161b corresponding to the recess DP. In addition, the optical path through which the light passes through the second part 161b corresponding to the part where neither the protrusion PP nor the recess DP is provided can be longer than the optical path through which the light passes through the second part 161b corresponding to the protrusion PP and can be shorter than the optical path through which the light passes through the second part 161b corresponding to the recess DP. Accordingly, in the display device 500 according to another exemplary embodiment of the present disclosure, the recessed inclined part 161c1 is provided in the third part 561c corresponding to the protrusion PP, and the protruding inclined part 161c is provided in the third part 561c corresponding to the recess DP. Accordingly, the flat inclined part 561c3 is provided in the third part 561c corresponding to the part where neither the protrusion PP nor the recess DP is provided. Accordingly, the volume of the bank 170 provided on the recessed inclined part 161c1 is larger than the volume of the bank 170 provided on the protruding inclined part 161c2. Accordingly, the optical path through which the light emitted from the organic layer 162 reaches the recessed inclined part 161c1 can be shorter than, equal to, or even longer than the optical path through which the light reaches the protruding inclined part 161c2. In addition, the optical path through which the light emitted from the organic layer 162 reaches the flat inclined part 561c3 can be longer than, equal to, or even shorter than the optical path through which the light reaches the recessed inclined part 161c1 and can be shorter than, equal to, or even longer than the optical path through which the light reaches the protruding inclined part 161c2. Accordingly, the recessed inclined part 161c1, the protruding inclined part 161c2, and the flat inclined part 561c3 can be provided to compensate for the length differences of the optical paths through which the light passes through the second part 161b corresponding to the protrusion PP, the optical path through which the light passes through the second part 161b corresponding to the recess DP, and the optical path through which the light passes through the second part 161b corresponding to the part where neither the protrusion PP nor the recess DP is provided. Accordingly, in the third part 561c of the first electrode 561, the recessed inclined part 161c1, the protruding inclined part 161c2, and the flat inclined part 561c3 corresponding to the protrusion PP, the recess DP, and the part where neither the protrusion PP nor the recess DP is provided are provided, respectively. Accordingly, the light reflected from the third part 161c corresponding to the protrusion PP, the light reflected from the third part 561c corresponding to the recess DP, and the light reflected from the third part 561c corresponding to the part where neither the protrusion PP nor the recess DP is provided can all be guided in the front surface direction.

[0122] Hereinafter, reference will be made to Figures 7 to 9Introduce various shapes of planar shapes that can be used for the first part.

[0123] Figure 7 is a plan view of a display device according to another exemplary embodiment of the present disclosure. For ease of description, in Figure 7 , only the first electrode 761 disposed in one sub-pixel SP among various components of the display device 700 is shown, and the fourth part 161d of the first electrode 761 is omitted. Figure 7 the display device 700 of Figures 1 to 4 and the only difference between the display device 100 of

[0124] is the shape of the first part 761a, but other configurations are the same or similar, so redundant descriptions will be omitted or given briefly. Figure 7 Referring to

[0125] Figure 7

[0126] Figure 8 Figure 8 Figure 8 is a plan view of a display device according to another exemplary embodiment of the present disclosure. For ease of description, in Figure 8 , only the first electrode 861 disposed in one sub-pixel SP among various components of the display device 800 is shown, and the fourth part 161d of the first electrode 861 is omitted. Figure 8 the display device 800 of Figures 1 to 4 and the only difference between the display device 100 of

[0127] is the shape of the first part 861a, but other configurations are the same or similar, so redundant descriptions will be omitted or given briefly. Figure 8 Referring to

[0128] The protruding part PP is a part whose area increases toward the outside of the first part 861a on a plane, and the recessed part DP is a part whose area decreases toward the inside of the first part 861a on a plane. As an example, the area of the protruding part PP and the area of the recessed part DP may be equal to each other, but it is not limited thereto. That is, the first part 861a is arranged to have a part with a decreasing area inward, and the area of this part is the same as the area of the part whose area increases outward on the plane. For example, the planar shape of the first part 861a may be a windmill shape as shown in Figure 8 , but it is not limited thereto. As an example, the first part 861a may include only one of the protruding part PP and the recessed part DP. As an example, the area of the protruding part PP and the area of the recessed part DP may be different from each other, but it is not limited thereto.

[0129] Figure 9 is a plan view of a display device according to another exemplary embodiment of the present disclosure. For ease of description, in Figure 9 , only the first electrode 961 provided in one sub-pixel SP among various components of the display device 900 is shown, and the fourth part 161d of the first electrode 961 is omitted. Figure 9 The display device 900 of Figure 5 and Figure 6 The only difference between the display device 500 of is the shape of the first part 961a, but other configurations are the same or similar, so redundant descriptions will be omitted or briefly given.

[0130] Referring to Figure 9 , in the display device 900 according to another exemplary embodiment of the present disclosure, the first part 961a of the first electrode 961 may include a protruding part PP and a recessed part DP.

[0131] The protruding part PP is a part whose area increases toward the outside of the first part 961a on a plane, and the recessed part DP is a part whose area decreases toward the inside of the first part 961a on a plane. As an example, the area of the protruding part PP and the area of the recessed part DP may be equal to each other, but it is not limited thereto. That is, the first part 961a is arranged to have a part with a decreasing area inward, and the area of this part is the same as the area of the part whose area increases outward on the plane. For example, the planar shape of the first part 961a may be a flower shape as shown in Figure 9 , but it is not limited thereto. As an example, the first part 961a may include only one of the protruding part PP and the recessed part DP. As an example, the area of the protruding part PP and the area of the recessed part DP may be different from each other, but it is not limited thereto.

[0132] The exemplary embodiments of the present disclosure may also be described as follows:

[0133] According to one aspect of the present disclosure, a display device includes: a substrate including a plurality of sub-pixels; an outer coating disposed on the substrate and including a base and protrusions, the protrusions being disposed on the base and having inclined side surfaces; an anode disposed corresponding to each of the plurality of sub-pixels and covering a part of the base and the protrusions; and a bank disposed on a part of the anode. The anode includes: a first part disposed on the top surface of the base and exposed from the bank; a second part disposed on the top surface of the base and covered by the bank; and a third part disposed on the side surface of the protrusion, an edge of the second part forming a first polygon in a plane. When a virtual second polygon congruent with the first polygon and sharing a center with the first polygon and having a smaller area than the first polygon in the plane is defined, the first part includes a protrusion formed by an edge disposed more externally than the second polygon in the plane and a recess formed by an edge disposed more internally than the second polygon in the plane, an area of the protrusion and an area of the recess being equal to each other in the plane, and the third part includes a concave inclined part corresponding to the protrusion and having a concave inclined surface and a convex inclined part corresponding to the recess and having a convex inclined surface.

[0134] The protrusion may be a part configured to increase an area of an outer part of the first part in the plane, and the recess may be a part configured to decrease an area of an inner part of the first part in the plane.

[0135] An area of the second part corresponding to the protrusion may be smaller than an area of the second part corresponding to the recess.

[0136] A volume of the bank disposed on the concave inclined part may be larger than a volume of the bank disposed on the convex inclined part.

[0137] The third part may further include a flat inclined part corresponding to an edge among edges of the first part that overlaps an edge of the second polygon in the plane.

[0138] A volume of the bank disposed on the flat inclined part may be smaller than a volume of the bank disposed on the concave inclined part and may be larger than a volume of the bank disposed on the convex inclined part.

[0139] The protrusion and the recess may not be provided in the first part opposite to the flat inclined part.

[0140] The smaller the distance from the top surface of the protrusion, the smaller the inclination angle of the concave inclined part may be.

[0141] The larger the distance from the top surface of the protrusion, the larger the inclination angle of the convex inclined part may be.

[0142] In the plane, each edge of the first polygon may have a part parallel to an edge of the second polygon.

[0143] The anode may further include a fourth portion extending from the third portion to be disposed on a part of the top surface of the protrusion.

[0144] Although the exemplary embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the present disclosure is not limited thereto and may be implemented in many different forms without departing from the technical concept of the present disclosure. Therefore, the exemplary embodiments of the present disclosure are provided for illustrative purposes only and are not intended to limit the technical concept of the present disclosure. The scope of the technical concept of the present disclosure is not limited thereto. Accordingly, it should be understood that the above exemplary embodiments are illustrative in all respects and do not limit the present disclosure. The protection scope of the present disclosure should be construed based on the appended claims, and all technical concepts within the equivalent scope thereof should be construed as falling within the scope of the present disclosure.

[0145] Cross - reference to related applications

[0146] This application claims the priority and benefit of Korean Patent Application No. 10 - 2023 - 0195552, filed with the Korean Intellectual Property Office on December 28, 2023, the disclosure of which is incorporated herein by reference in its entirety for all purposes as if fully set forth herein.

Claims

1. A display device, comprising: a substrate, the substrate comprising a plurality of sub-pixels; an outer coating layer disposed on the substrate; an anode disposed on the overcoat layer to correspond to each of the plurality of sub-pixels; as well as a bank disposed on a portion of the anode, Wherein, the anode comprises: a first portion disposed on a top surface of the outer coating layer and exposed from the bank; and a second portion extending from the first portion, disposed on the top surface of the outer coating and covered by the bank, and The edge of the first portion includes at least one protrusion protruding toward the second portion.

2. The display device according to claim 1, wherein: The edge of the first portion further includes at least one recessed portion recessed inside the first portion.

3. The display device according to claim 2, wherein: The protrusions and the recesses are alternately arranged along at least a portion of the edge of the first portion.

4. The display device according to claim 3, wherein: The at least a portion of the edge of the first portion has a planar shape including rounded serrations or square serrations.

5. The display device according to claim 2, wherein: With respect to a reference line from which the protrusion protrudes and from which the recessed portion is recessed, an area of ​​the protrusion and an area of ​​the recessed portion are equal to each other on a plane.

6. The display device according to claim 2, wherein: The protrusion and the recess are not provided in a portion of the edge of the first portion, the portion of the edge overlapping a reference line from which the protrusion protrudes and from which the recess is recessed.

7. The display device according to claim 2, wherein: The outer coating layer includes a base and a protrusion disposed on the base and having a side surface inclined toward the first portion and the second portion disposed on a top surface of the base.

8. The display device according to claim 7, wherein: The anode further includes a third portion extending from the second portion and disposed on the side surface of the protrusion.

9. The display device according to claim 8, wherein: The third portion includes a concave inclined portion corresponding to the protruding portion and having a concave inclined surface, and a convex inclined portion corresponding to the recessed portion and having a convex inclined surface.

10. The display device according to claim 9, wherein: The third portion further includes a flat inclined portion corresponding to a portion of the edge of the first portion in which the protruding portion and the recessed portion are not provided.

11. The display device according to claim 9, wherein: The embankment also covers the third portion, and The optical path of light emitted from the organic layer disposed on the first portion to reach the concave inclined portion and the optical path of light emitted from the organic layer to reach the convex inclined portion have the same length.

12. The display device according to claim 8, wherein: The third portion includes a reflective layer reflecting light emitted from an organic layer disposed on the first portion.

13. The display device according to claim 8, wherein: The inclined portion of the third portion corresponding to the protruding portion is more recessed downward than the inclined portion of the third portion corresponding to the recessed portion.

14. The display device according to claim 1, wherein: The edge of the second part forms a first polygon on the plane, and when a virtual second polygon is defined that is congruent with the first polygon while sharing a center with the first polygon and is set on the plane with a smaller area than the first polygon, the first part includes a protrusion formed by the edge of the outside of the second polygon set on the plane and a recessed portion formed by the edge of the inside of the second polygon.

15. The display device according to claim 14, wherein: An area of ​​the protrusion and an area of ​​the depression are equal to each other on a plane.

16. The display device according to claim 14, wherein: The outer coating layer includes a base and a protrusion, the protrusion is disposed on the base and has a side surface inclined toward the first part and the second part, the anode covers a part of the protrusion and the base, and the first part and the second part are disposed on a top surface of the base, and The anode further includes a third portion disposed on the side surface of the protrusion, and the third portion includes a concave inclined portion corresponding to the protrusion and having a concave inclined surface and a convex inclined portion corresponding to the recessed portion and having a convex inclined surface.

17. The display device according to claim 16, wherein: The protrusion is a portion extending to the outside of the first portion on a plane, and the depression is a portion depressed to the inside of the first portion on a plane.

18. The display device according to claim 16, wherein: An area of ​​the second portion corresponding to the protrusion is smaller than an area of ​​the second portion corresponding to the recess.

19. The display device according to claim 18, wherein: The volume of the bank provided on the concave inclined portion is greater than the volume of the bank provided on the convex inclined portion.

20. The display device according to claim 16, wherein: The third portion further includes a flat inclined portion corresponding to an edge among edges of the first portion that overlaps an edge of the second polygon on a plane.

21. The display device according to claim 20, wherein: The volume of the bank provided on the flat inclined portion is smaller than the volume of the bank provided on the concave inclined portion, and is larger than the volume of the bank provided on the convex inclined portion.

22. The display device according to claim 20, wherein: The protrusion and the recess are not provided in a portion of the edge of the first portion corresponding to the flat inclined portion.

23. The display device according to claim 16, wherein: The farther away from the top surface of the protrusion, the smaller the inclination angle of the concave inclined portion.

24. The display device according to claim 16, wherein: The farther away from the top surface of the protrusion, the greater the inclination angle of the convex inclined portion.

25. The display device according to claim 16, wherein: On a plane, each edge of the first polygon has a portion parallel to an edge of the second polygon.

26. The display device according to claim 16, wherein: The anode further includes a fourth portion extending from the third portion to be disposed on a portion of a top surface of the protrusion.

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